TW201329542A - Optical sheet, transparent conductive laminate and touch panel - Google Patents

Optical sheet, transparent conductive laminate and touch panel Download PDF

Info

Publication number
TW201329542A
TW201329542A TW101143606A TW101143606A TW201329542A TW 201329542 A TW201329542 A TW 201329542A TW 101143606 A TW101143606 A TW 101143606A TW 101143606 A TW101143606 A TW 101143606A TW 201329542 A TW201329542 A TW 201329542A
Authority
TW
Taiwan
Prior art keywords
hard coat
coat layer
optical sheet
layer
refractive index
Prior art date
Application number
TW101143606A
Other languages
Chinese (zh)
Other versions
TWI551898B (en
Inventor
Tadashi Akamatsu
Daishi Endo
Original Assignee
Keiwa Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Keiwa Inc filed Critical Keiwa Inc
Publication of TW201329542A publication Critical patent/TW201329542A/en
Application granted granted Critical
Publication of TWI551898B publication Critical patent/TWI551898B/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/111—Anti-reflection coatings using layers comprising organic materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3058—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state comprising electrically conductive elements, e.g. wire grids, conductive particles
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133502—Antiglare, refractive index matching layers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)
  • Surface Treatment Of Optical Elements (AREA)

Abstract

The purpose of the present invention is to provide an optical sheet, a transparent conductive laminate, and a touch panel. The optical sheet, the transparent conductive laminate, and the touch panel have excellent hardness and can effectively prevent generation of curvature thereby avoiding change of phase difference. The transparent conductive laminate includes the optical sheet. The touch panel includes the transparent conducive laminate. The optical sheet of the present invention includes: a phase difference film for use as a main component including transparent polymer; a first hard coating layer formed on one surface side of the phase difference film; and a second hard coating layer formed on one surface side of the hard coating layer. The pencil hardness of the second hard coating layer is larger than 3H. The pencil hardness of the first hard coating layer is smaller than the pencil hardness of the second hard coating layer. The thickness of the second hard coating layer is larger than 1 <mu>m and smaller than 10<mu>m. The thickness of the first hard coating layer is larger than 4 times and smaller than 20 times of the thickness of the second hard costing layer.

Description

光學片、透明導電性層疊體和觸摸面板 Optical sheet, transparent conductive laminate, and touch panel

本發明涉及光學片、包括該光學片的透明導電性層疊體以及包括該透明導電性層疊體的觸摸面板。 The present invention relates to an optical sheet, a transparent conductive laminate including the optical sheet, and a touch panel including the transparent conductive laminate.

液晶顯示模組(LCD)具有薄、重量輕、耗電小等特徵，利用所述特徵大多將液晶顯示模組用作平板顯示器，並且該用途正逐年擴大，可以作為手機、個人數位助理(PDA)、個人電腦、電視等資訊用顯示器件。近年來，根據用途，對液晶顯示模組所要求的特性是各種各樣的，作為對液晶顯示模組所要求的特性，可以列舉明亮(高亮度化)、易看(寬視角化)、節能化、薄型輕量化以及大螢幕化等。 The liquid crystal display module (LCD) has the characteristics of thinness, light weight, low power consumption, etc., and the liquid crystal display module is mostly used as a flat panel display, and the use is expanding year by year, and can be used as a mobile phone and a personal digital assistant (PDA). ), display devices for information such as personal computers and televisions. In recent years, various characteristics required for a liquid crystal display module are various depending on the application, and as a characteristic required for a liquid crystal display module, bright (high luminance), easy viewing (wide viewing angle), and energy saving can be cited. Chemical, thin and lightweight, and large screens.

為了提高觀看的人的易操作性、迅速性等，作為所述的液晶顯示模組，有安裝有觸摸面板的液晶顯示模組。此外，安裝有觸摸面板的液晶顯示模組通常具有下述結構：從表面側至背面側，依次重疊有觸摸面板、液晶顯示元件、各種光學片以及背光源。 In order to improve the ease of operation, speed, and the like of the person watching, there is a liquid crystal display module in which the touch panel is mounted as the liquid crystal display module. Further, the liquid crystal display module in which the touch panel is mounted generally has a structure in which a touch panel, a liquid crystal display element, various optical sheets, and a backlight are sequentially superposed from the front side to the back side.

作為所述觸摸面板，存在電容方式、電阻膜方式和電磁感應方式等的觸摸面板。作為電容方式，存在下述的方式：使電極在相互交叉的方向上延伸，當手指等接觸觸摸面板時，電極間的電容發生變化，對該變化進行檢測，由此檢測輸入位置；以及在透明導電膜的兩端施加相位相同、電位相同的交流電，當手指接觸或靠近從而形成電容時產生微弱電流，檢測該微弱電流，由此檢測輸入位置，等等。 As the touch panel, there are a touch panel such as a capacitive method, a resistive film method, and an electromagnetic induction method. As a capacitive method, there is a method in which electrodes are extended in a direction in which they cross each other, and when a finger or the like contacts the touch panel, capacitance between the electrodes changes, the change is detected, thereby detecting an input position; and being transparent An alternating current having the same phase and the same potential is applied to both ends of the conductive film, and a weak current is generated when the finger contacts or approaches to form a capacitance, the weak current is detected, thereby detecting the input position, and the like.

此外，在所述的觸摸面板中還有在觸摸面板的最表面配置有偏光板且在觸摸面板的表面側和背面側配置有一對相位差膜(1/4 波片)，從而能使從液晶面板射出的光很好地透過，並能有效地防止對外部的光的反射。此外，為了提高所述的相位差膜的防止產生損傷的性能等，還提出了把硬塗層層疊在相位差膜上的光學片的方案。 Further, in the touch panel described above, a polarizing plate is disposed on the outermost surface of the touch panel, and a pair of retardation films are disposed on the front side and the back side of the touch panel (1/4). The wave plate) enables light emitted from the liquid crystal panel to be well transmitted, and can effectively prevent reflection of external light. Further, in order to improve the performance of preventing the damage of the retardation film described above, an optical sheet in which a hard coat layer is laminated on a retardation film has been proposed.

可是，所述的光學片存在因相位差膜與硬塗層的硬度差而引起的產生捲曲的問題。此外，在產生捲曲的情況下，存在相位差膜的相位差發生變化，從而導致不能保持所希望的雙折射的問題。 However, the optical sheet described above has a problem of occurrence of curl due to a difference in hardness between the retardation film and the hard coat layer. Further, in the case where curl is generated, there is a change in the phase difference of the retardation film, resulting in a problem that the desired birefringence cannot be maintained.

與此相對，近來提出了一種技術方案：通過使硬塗層成為包括第一硬塗層(內層)和第二硬塗層(外層)的雙層結構，由此能夠抑制產生捲曲(參照專利文獻1：日本專利公開公報特開2000-71392號)。在該公報所記載的硬塗層膜中，在基材層的表面設有由自由基聚合性樹脂和陽離子聚合性樹脂的混合物製成的固化樹脂層作為第一硬塗層，在該第一硬塗層的表面設有厚度與第一硬塗層的厚度大體相同的第二硬塗層，由此可以實現在保持耐擦傷性能的同時，防止產生捲曲及防止產生裂紋。 On the other hand, a technical solution has recently been proposed in which the occurrence of curling can be suppressed by making the hard coat layer a two-layer structure including the first hard coat layer (inner layer) and the second hard coat layer (outer layer) (refer to the patent) Document 1: Japanese Patent Laid-Open Publication No. 2000-71392). In the hard coat film described in the publication, a cured resin layer made of a mixture of a radical polymerizable resin and a cationically polymerizable resin is provided as a first hard coat layer on the surface of the base material layer, and the first The surface of the hard coat layer is provided with a second hard coat layer having a thickness substantially the same as that of the first hard coat layer, whereby it is possible to prevent the occurrence of curl and the prevention of cracking while maintaining the scratch resistance.

此外，作為具有雙層結構的硬塗層的硬塗層膜，還提出有下述的方案：第一硬塗層的鉛筆硬度比第二硬塗層的鉛筆硬度小，並且第一硬塗層的厚度比第二硬塗層的厚度厚(參照專利文獻2：日本專利公開公報特開2007-219013號)。在該公報所記載的硬塗層膜中，通過相同的塗佈方法層疊由低收縮的聚氨酯丙烯酸酯()等製成的第一硬塗層和由高硬度的聚氨酯丙烯酸酯等製成的第二硬塗層，因此第二硬塗層的厚度大體為第一硬塗層厚度的一半以上。 Further, as a hard coat film having a hard coat layer having a two-layer structure, there is also proposed a solution in which the pencil hardness of the first hard coat layer is smaller than that of the second hard coat layer, and the first hard coat layer The thickness is thicker than the thickness of the second hard coat layer (refer to Japanese Laid-Open Patent Publication No. 2007-219013). In the hard coat film described in this publication, a low shrinkage urethane acrylate is laminated by the same coating method ( And a second hard coat layer made of a high hardness urethane acrylate or the like, and thus the thickness of the second hard coat layer is substantially more than half of the thickness of the first hard coat layer.

可是，所述專利文獻1的硬塗層膜由於第一硬塗層和第二硬塗層的厚度大體相同，所以第一硬塗層薄，導致硬塗層膜的表面沒有足夠的硬度。此外，該硬塗層膜如果為了得到足夠的硬度而增大硬塗層的厚度，則第二硬塗層會變得過厚，存在產生捲曲的問題。 However, in the hard coat film of Patent Document 1, since the thicknesses of the first hard coat layer and the second hard coat layer are substantially the same, the first hard coat layer is thin, resulting in insufficient hardness of the surface of the hard coat film. Further, if the hard coat film increases the thickness of the hard coat layer in order to obtain sufficient hardness, the second hard coat layer becomes too thick, and there is a problem that curling occurs.

此外，所述專利文獻2的硬塗層膜由於第二硬塗層的厚度雖然比第一硬塗層的厚度薄，但是第二硬塗層的厚度為第一硬塗層的厚度的大體一半以上，因此作為結果，硬塗層膜的表面沒有足夠的硬度，此外也不能可靠地防止產生捲曲。 Further, in the hard coat film of Patent Document 2, although the thickness of the second hard coat layer is thinner than the thickness of the first hard coat layer, the thickness of the second hard coat layer is substantially half the thickness of the first hard coat layer. As described above, as a result, the surface of the hard coat film does not have sufficient hardness, and further, curling cannot be reliably prevented.

現有技術文獻 Prior art literature

專利文獻1：日本專利公開公報特開2000-71392號 Patent Document 1: Japanese Patent Laid-Open Publication No. 2000-71392

專利文獻2：日本專利公開公報特開2007-219013號 Patent Document 2: Japanese Patent Laid-Open Publication No. 2007-219013

鑒於所述的問題，本發明的目的是提供一種具有優異的硬度、且能有效地防止產生捲曲並能防止相位差發生變化的光學片、包括該光學片的透明導電性層疊體以及包括該透明導電性層疊體的觸摸面板。 In view of the problems described above, an object of the present invention is to provide an optical sheet having excellent hardness and capable of effectively preventing occurrence of curl and preventing a change in phase difference, a transparent electroconductive laminate including the optical sheet, and including the transparent A touch panel of a conductive laminate.

為了解決所述的問題，本發明提供一種光學片，其包括：相位差膜，作為主要成分含有透明性高分子；第一硬塗層，形成於所述相位差膜的一個面側；以及第二硬塗層，形成於所述第一硬塗層的一個面側，所述第二硬塗層的鉛筆硬度為3H以上，所述第一硬塗層的鉛筆硬度比所述第二硬塗層的鉛筆硬度小，所述第二硬塗層的厚度為1μm以上10μm以下，所述第一硬塗層的厚度是所述第二硬塗層的厚度的4倍以上20倍以下。 In order to solve the above problems, the present invention provides an optical sheet comprising: a retardation film containing a transparent polymer as a main component; a first hard coat layer formed on one surface side of the retardation film; a second hard coat layer formed on one surface side of the first hard coat layer, a pencil hardness of the second hard coat layer being 3H or more, and a pencil hardness of the first hard coat layer is lower than the second hard coat layer The pencil hardness of the layer is small, the thickness of the second hard coat layer is 1 μm or more and 10 μm or less, and the thickness of the first hard coat layer is 4 times or more and 20 times or less the thickness of the second hard coat layer.

該光學片在相位差膜和第二硬塗層之間配置有鉛筆硬度比第二硬塗層的鉛筆硬度小的第一硬塗層。因此，該光學片能夠防止因相位差膜和第二硬塗層的硬度差而產生捲曲，並且通過第一硬塗層和第二硬塗層能有效地提高相位差膜的一個面側的硬度。特別是，使所述光學片的第二硬塗層的厚度在所述範圍內，並且使第一硬塗層的厚度保持在第二硬塗層的厚度的4倍以上20倍以下，由此所述光學片能很好地防止因第二硬塗層的鉛筆硬度比較高而產生捲曲。其結果，所述光學片能有效地防止因產生捲曲而造成相位差膜的相位差發生變化。 The optical sheet is provided with a first hard coat layer having a pencil hardness smaller than that of the second hard coat layer between the retardation film and the second hard coat layer. Therefore, the optical sheet can prevent curling due to the difference in hardness between the retardation film and the second hard coat layer, and the hardness of one side of the retardation film can be effectively improved by the first hard coat layer and the second hard coat layer. . In particular, the thickness of the second hard coat layer of the optical sheet is within the range, and the thickness of the first hard coat layer is maintained at 4 times or more and 20 times or less the thickness of the second hard coat layer, thereby The optical sheet can well prevent curling due to the relatively high pencil hardness of the second hard coat layer. As a result, the optical sheet can effectively prevent the phase difference of the retardation film from being changed due to the occurrence of curl.

在所述光學片中，優選的是，所述第一硬塗層的鉛筆硬度為F以上2H以下。由此，可以更有效地提高相位差膜的一個面側的硬度。 In the optical sheet, it is preferable that the pencil hardness of the first hard coat layer is F or more and 2H or less. Thereby, the hardness of one surface side of the retardation film can be more effectively improved.

在所述光學片中，優選的是，所述第一硬塗層的厚度為20μm以上100μm以下。由此，可以更好地防止產生捲曲。 In the optical sheet, it is preferable that the first hard coat layer has a thickness of 20 μm or more and 100 μm or less. Thereby, it is possible to better prevent the occurrence of curl.

在所述光學片中，優選的是，所述透明性高分子是聚碳酸酯類樹脂、環烯烴類樹脂或丙烯酸類樹脂。該光學片即使在使用聚碳酸酯類樹脂或環烯烴類樹脂這樣的硬度比較低且容易產生捲曲的樹脂作為相位差膜的主要成分的情況下，也能防止產生捲曲，並能有效地提高該相位差膜的一個面側的硬度。通過使用聚碳酸酯類樹脂作為所述相位差膜的主要成分，該光學片能提高耐衝擊性。通過使用環烯烴類樹脂作為所述相位差膜的主要成分，該光學片能有效地抑制因直射陽光及顯示器的發熱等外力而產生的相位差的變化。此外，通過使用丙烯酸類樹脂作為所述相位差膜的主要成分，該光學片能具有優異的光學透明性，能使光線非常好地透過。 In the optical sheet, it is preferable that the transparent polymer is a polycarbonate resin, a cycloolefin resin, or an acrylic resin. In the case where a resin having a relatively low hardness and a curling property such as a polycarbonate resin or a cycloolefin resin is used as a main component of the retardation film, the optical sheet can be prevented from being curled and can be effectively improved. The hardness of one side of the retardation film. By using a polycarbonate resin as a main component of the retardation film, the optical sheet can improve impact resistance. By using a cycloolefin-based resin as a main component of the retardation film, the optical sheet can effectively suppress a change in phase difference due to an external force such as direct sunlight and heat generated by the display. Further, by using an acrylic resin as a main component of the retardation film, the optical sheet can have excellent optical transparency and can transmit light very well.

在所述光學片中，優選的是，所述第一硬塗層的主要成分是紫外線固化性樹脂。由此，能提高易製造性。此外，該光學片能防止因對相位差膜施加熱量而產生的熱膨脹或熱收縮，從而能提高尺寸穩定性。 In the optical sheet, it is preferable that a main component of the first hard coat layer is an ultraviolet curable resin. Thereby, the ease of manufacture can be improved. Further, the optical sheet can prevent thermal expansion or thermal contraction due to application of heat to the retardation film, thereby improving dimensional stability.

在所述光學片中，優選的是，當所述第一硬塗層的主要成分含有紫外線固化性樹脂時，該紫外線固化性樹脂是陽離子聚合性樹脂。由此，能提高與相位差膜的黏合性能，並且能抑制黏合力隨時間發生變化。此外，通過使用陽離子聚合性樹脂作為第一硬塗層的主要成分，該光學片能防止捲曲，並能進一步提高尺寸穩定性。 In the optical sheet, preferably, when the main component of the first hard coat layer contains an ultraviolet curable resin, the ultraviolet curable resin is a cationically polymerizable resin. Thereby, the adhesion property with the retardation film can be improved, and the adhesive force can be suppressed from changing with time. Further, by using a cationically polymerizable resin as a main component of the first hard coat layer, the optical sheet can prevent curling and can further improve dimensional stability.

在所述光學片中，優選的是，所述第一硬塗層的主要成分含有紫外線固化性樹脂，並且含有抗紫外線劑。通常，當第一硬塗 層的主要成分是紫外線固化性樹脂，並且該第一硬塗層含有抗紫外線劑的情況下，第一硬塗層的固化速度變慢，生產率降低。可是，該光學片由於第一硬塗層的厚度設定得比較厚，所以即使把抗紫外線劑的濃度控制在比較低的濃度，也能在第一硬塗層中含有足夠量的抗紫外線劑。因此，該光學片即使在第一硬塗層中含有足夠量的抗紫外線劑的情況下，也能抑制第一硬塗層的固化速度降低，從而能防止生產率降低。 In the optical sheet, it is preferable that a main component of the first hard coat layer contains an ultraviolet curable resin and contains an ultraviolet ray-resistant agent. Usually when the first hard coat When the main component of the layer is an ultraviolet curable resin, and the first hard coat layer contains an ultraviolet ray-resistant agent, the curing speed of the first hard coat layer is slow, and the productivity is lowered. However, since the thickness of the first hard coat layer is set to be relatively thick, the optical sheet can contain a sufficient amount of the ultraviolet resistant agent in the first hard coat layer even if the concentration of the ultraviolet resistant agent is controlled to a relatively low concentration. Therefore, even in the case where the first hard coat layer contains a sufficient amount of the ultraviolet resistant agent, the optical sheet can suppress a decrease in the curing speed of the first hard coat layer, thereby preventing a decrease in productivity.

在所述光學片中，優選的是，所述相位差膜是1/4波長膜或1/2波長膜。由此，所述光學片能適用於觸摸面板等。 In the optical sheet, it is preferable that the retardation film is a 1/4 wavelength film or a 1/2 wavelength film. Thereby, the optical sheet can be applied to a touch panel or the like.

在所述光學片中，優選的是，所述光學片還包括高折射率層，該高折射率層形成於所述相位差膜的另一個面側。由此，能提高相位差膜的另一個面側的折射率。 In the optical sheet, preferably, the optical sheet further includes a high refractive index layer formed on the other surface side of the retardation film. Thereby, the refractive index of the other surface side of the retardation film can be improved.

在所述光學片中，優選的是，所述高折射率層的折射率為1.6以上2.3以下。由此，在把該光學片的高折射率層一側層疊在觸摸面板等的透明導電層上的情況下，能使高折射率層的折射率與透明導電層的折射率接近。其結果，該光學片能使形成於透明導電層的電極圖案的可見性降低。 In the optical sheet, it is preferable that the high refractive index layer has a refractive index of 1.6 or more and 2.3 or less. Therefore, when the high refractive index layer side of the optical sheet is laminated on a transparent conductive layer such as a touch panel, the refractive index of the high refractive index layer can be made close to the refractive index of the transparent conductive layer. As a result, the optical sheet can reduce the visibility of the electrode pattern formed on the transparent conductive layer.

此外，為了解決所述的問題，本發明還提供一種透明導電性層疊體，其包括：所述的光學片；以及透明導電層，層疊於所述光學片的所述高折射率層的另一個面。 Further, in order to solve the problems, the present invention also provides a transparent electroconductive laminate comprising: the optical sheet; and a transparent conductive layer laminated on the other of the high refractive index layers of the optical sheet surface.

該透明導電性層疊體由於包括所述光學片，所以能很好地防止所述光學片產生捲曲，從而能有效地防止因產生捲曲而造成相位差膜的相位差發生變化。此外，該透明導電性層疊體由於包括所述光學片，能有效地提高相位差膜的一個面側的硬度。此外，通過使高折射率層的折射率接近透明導電層的折射率，例如使高折射率層的折射率接近ITO的折射率2.1~2.2(λ=520nm)，在該透明導電性層疊體用於，例如：觸摸面板的情況下，能降低形成於透明導電層的電極圖案的可見性。 Since the transparent electroconductive laminate includes the optical sheet, it is possible to prevent the optical sheet from being curled, and it is possible to effectively prevent the phase difference of the retardation film from being changed due to the occurrence of curl. Further, since the transparent electroconductive laminate includes the optical sheet, the hardness of one surface side of the retardation film can be effectively improved. Further, by bringing the refractive index of the high refractive index layer close to the refractive index of the transparent conductive layer, for example, the refractive index of the high refractive index layer is close to the refractive index of ITO of 2.1 to 2.2 (λ = 520 nm), for the transparent conductive laminated body. In the case of, for example, a touch panel, the visibility of the electrode pattern formed on the transparent conductive layer can be reduced.

在所述透明導電性層疊體中，優選的是，所述高折射率層的折射率與所述透明導電層的折射率的差為0.6以下。由此，能進一步降低形成於透明導電層的電極圖案的可見性。 In the transparent electroconductive laminate, it is preferable that a difference between a refractive index of the high refractive index layer and a refractive index of the transparent conductive layer is 0.6 or less. Thereby, the visibility of the electrode pattern formed on the transparent conductive layer can be further reduced.

此外，為了解決所述的問題，本發明還提供一種觸摸面板，其包括所述的透明導電性層疊體。 Further, in order to solve the problems described, the present invention also provides a touch panel including the transparent conductive laminate.

該觸摸面板由於包括所述光學片，所以能很好地防止所述光學片產生捲曲，從而能有效地防止因產生捲曲而造成相位差膜的相位差發生變化。此外，該觸摸面板由於包括所述光學片，所以能有效地提高相位差膜的一個面側的硬度。此外，通過使高折射率層的折射率與透明導電層的折射率接近，該觸摸面板能降低形成於透明導電層的電極圖案的可見性。 Since the touch panel includes the optical sheet, it is possible to prevent the optical sheet from being curled, and it is possible to effectively prevent the phase difference of the retardation film from being changed due to the occurrence of curl. Further, since the touch panel includes the optical sheet, the hardness of one surface side of the retardation film can be effectively improved. Further, by making the refractive index of the high refractive index layer close to the refractive index of the transparent conductive layer, the touch panel can reduce the visibility of the electrode pattern formed on the transparent conductive layer.

此外，在本發明中，所謂的“鉛筆硬度”是指根據在JIS K5600-5-4中規定的試驗方法中記載的鉛筆劃痕值得到的值。此外，所謂的“厚度”是指按JIS K7130測量得到的平均厚度。 In the present invention, the term "pencil hardness" means a value obtained from the pencil scratch value described in the test method specified in JIS K5600-5-4. Further, the so-called "thickness" means an average thickness measured in accordance with JIS K7130.

所謂的“抗紫外線劑”是具有防止因紫外線造成的光劣化功能的添加劑，是包括紫外線吸收劑和紫外線穩定劑等的概念。 The "anti-UV agent" is an additive having a function of preventing photodegradation by ultraviolet rays, and is a concept including an ultraviolet absorber and an ultraviolet stabilizer.

如上所述，本發明的光學片、包括該光學片的透明導電性層疊體以及包括該透明導電性層疊體的觸摸面板能提高所述光學片的硬度，並且能有效地防止產生捲曲，從而能防止相位差發生變化。 As described above, the optical sheet of the present invention, the transparent electroconductive laminate including the optical sheet, and the touch panel including the transparent electroconductive laminate can improve the hardness of the optical sheet and can effectively prevent curling, thereby enabling Prevent the phase difference from changing.

1‧‧‧光學片 1‧‧‧ optical film

2‧‧‧相位差膜 2‧‧‧ phase difference film

3‧‧‧硬塗層 3‧‧‧hard coating

4‧‧‧第一硬塗層 4‧‧‧First hard coating

5‧‧‧第二硬塗層 5‧‧‧Second hard coating

11‧‧‧光學片 11‧‧‧Optical film

12‧‧‧高折射率層 12‧‧‧High refractive index layer

21‧‧‧透明導電性層疊體 21‧‧‧Transparent Conductive Laminates

22‧‧‧透明導電層 22‧‧‧Transparent conductive layer

31‧‧‧觸摸面板 31‧‧‧ touch panel

32‧‧‧玻璃基板 32‧‧‧ glass substrate

33‧‧‧黏合層 33‧‧‧Adhesive layer

41‧‧‧觸摸面板 41‧‧‧ touch panel

42‧‧‧點狀間隔物 42‧‧‧ dot spacers

43‧‧‧柱狀間隔物 43‧‧‧ Column spacers

44‧‧‧透明導電膜 44‧‧‧Transparent conductive film

45‧‧‧高折射率層 45‧‧‧High refractive index layer

46‧‧‧玻璃基板 46‧‧‧ glass substrate

圖1是表示本發明一個實施方式的光學片的示意剖視圖。 Fig. 1 is a schematic cross-sectional view showing an optical sheet according to an embodiment of the present invention.

圖2是表示與圖1的光學片不同方式的光學片的示意剖視圖。 Fig. 2 is a schematic cross-sectional view showing an optical sheet different from the optical sheet of Fig. 1.

圖3是表示本發明一個實施方式的透明導電性層疊體的示意剖視圖。 3 is a schematic cross-sectional view showing a transparent electroconductive laminate according to an embodiment of the present invention.

圖4是表示本發明一個實施方式的觸摸面板的示意剖視圖。 4 is a schematic cross-sectional view showing a touch panel according to an embodiment of the present invention.

圖5是表示與圖4的觸摸面板不同方式的觸摸面板的示意剖視圖。 FIG. 5 is a schematic cross-sectional view showing a touch panel different from the touch panel of FIG. 4. FIG.

第一實施方式 First embodiment

下面參照合適的附圖對本發明的實施方式進行詳細說明。 Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

圖1的光學片1包括相位差膜2和硬塗層3。 The optical sheet 1 of Fig. 1 includes a retardation film 2 and a hard coat layer 3.

相位差膜2 Phase difference film 2

相位差膜2由於要能夠使光線透過，因此是透明的，特別是無色透明的。相位差膜2作為主要成分含有透明性高分子。相位差膜2是1/4波長膜。 The retardation film 2 is transparent because it is capable of transmitting light, and is particularly colorless and transparent. The retardation film 2 contains a transparent polymer as a main component. The retardation film 2 is a 1/4 wavelength film.

對相位差膜2的作為主要成分含有的透明性高分子沒有特別的限定，相位差膜2的作為主要成分含有的透明性高分子，可以例舉：聚碳酸酯類樹脂、聚芳酯類樹脂、聚碸類樹脂、聚醯亞胺類樹脂、聚醚醯亞胺類樹脂、聚對苯二甲酸乙二醇酯類樹脂、聚萘二甲酸乙二醇酯類樹脂、環烯烴類樹脂、丙烯酸類樹脂、馬來醯亞胺類樹脂等。其中，相位差膜2的作為主要成分含有的透明性高分子，從光學特性、硬度等方面出發，優選的是聚碳酸酯類樹脂、環烯烴類樹脂或丙烯酸類樹脂，特別優選的是聚碳酸酯類樹脂。 The transparent polymer contained as the main component of the retardation film 2 is not particularly limited, and the transparent polymer contained as the main component of the retardation film 2 may, for example, be a polycarbonate resin or a polyarylate resin. , polyfluorene-based resin, polyimide-based resin, polyether oxime-based resin, polyethylene terephthalate resin, polyethylene naphthalate resin, cycloolefin resin, acrylic acid Resin, maleic imine resin, etc. In particular, the transparent polymer contained as the main component of the retardation film 2 is preferably a polycarbonate resin, a cycloolefin resin or an acrylic resin from the viewpoints of optical properties, hardness, and the like, and particularly preferably polycarbonate. Ester resin.

只要不損害透明性和所希望的強度，相位差膜2也可以含有其他任意成分，優選的是含有90品質%以上的由透明性高分子構成的主要成分，更優選的是含有98品質%以上的由透明性高分子構成的主要成分。在此，作為任意成分的例子，可以例舉紫外線吸收劑、穩定劑、潤滑劑、加工助劑、增塑劑、耐衝擊助劑、相位差降低劑、消光劑、抗菌劑、防黴劑等。 The retardation film 2 may contain other optional components as long as it does not impair the transparency and the desired strength, and preferably contains 90% by mass or more of a main component composed of a transparent polymer, and more preferably contains 98% by mass or more. The main component composed of a transparent polymer. Here, examples of the optional component include an ultraviolet absorber, a stabilizer, a lubricant, a processing aid, a plasticizer, an impact modifier, a phase difference reducing agent, a matting agent, an antibacterial agent, an antifungal agent, and the like. .

作為形成相位差膜2的聚碳酸酯類樹脂沒有特別的限定，可以使用直鏈聚碳酸酯類樹脂或支鏈聚碳酸酯類樹脂的任一種。此外，作為形成相位差膜2的聚碳酸酯類樹脂也可以使用由直鏈聚碳酸酯類樹脂和支鏈聚碳酸酯類樹脂構成的聚碳酸酯類樹脂。 The polycarbonate resin forming the retardation film 2 is not particularly limited, and any of a linear polycarbonate resin or a branched polycarbonate resin can be used. Further, as the polycarbonate resin forming the retardation film 2, a polycarbonate resin composed of a linear polycarbonate resin and a branched polycarbonate resin can also be used.

直鏈聚碳酸酯類樹脂是通過習知的光氣法或熔融法製造的直 鏈芳香族聚碳酸酯類樹脂，由碳酸酯成分和雙酚()成分製成。作為用於導入碳酸酯成分的前驅物質，可以例舉光氣、碳酸二苯酯等。此外，作為雙酚，可以例舉2,2-二(4-羥基苯基)丙烷、2,2-二(3,5-二甲基-4-羥基苯基)丙烷、1,1-二(4-羥基苯基)環己烷、1,1-二(3,5-二甲磺醯基-4-羥基苯基)環己烷、1,1-二(4-羥基苯基)癸烷、1,1-二(4-羥基苯基)丙烷、1,1-二(4-羥基苯基)環癸烷、1,1-二(3,5-二甲基-4-羥基苯基)環十二烷、4,4’-二羥基二苯醚、4,4’-硫代二苯酚、4,4’-二羥基-3,3-二氯二苯醚等。這些物質可以單獨使用，也可以將兩種以上的物質組合使用。所述的直鏈聚碳酸酯類樹脂可以通過例如美國專利US3989672號中記載的方法等來製造。 The linear polycarbonate resin is a linear aromatic polycarbonate resin produced by a conventional phosgene method or a melting method, and is composed of a carbonate component and bisphenol ( ) Made of ingredients. As a precursor for introducing a carbonate component, phosgene, diphenyl carbonate, etc. are mentioned. Further, as the bisphenol, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 1,1-di can be exemplified. (4-hydroxyphenyl)cyclohexane, 1,1-bis(3,5-dimethylsulfonyl-4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)fluorene Alkane, 1,1-bis(4-hydroxyphenyl)propane, 1,1-bis(4-hydroxyphenyl)cyclodecane, 1,1-bis(3,5-dimethyl-4-hydroxybenzene Base) cyclododecane, 4,4'-dihydroxydiphenyl ether, 4,4'-thiodiphenol, 4,4'-dihydroxy-3,3-dichlorodiphenyl ether and the like. These may be used singly or in combination of two or more. The linear polycarbonate resin can be produced by, for example, the method described in U.S. Patent No. 3,819,672.

作為支鏈聚碳酸酯類樹脂，是使用支化劑製造的聚碳酸酯類樹脂，作為支化劑，可以例舉間苯三酚、偏苯三酸、1,1,1-三(4-羥基苯基)乙烷、1,1,2-三(4-羥基苯基)乙烷、1,1,2-三(4-羥基苯基)丙烷、1,1,1-三(4-羥基苯基)甲烷、1,1,1-三(4-羥基苯基)丙烷、1,1,1-三(2-甲基-4-羥基苯基)甲烷、1,1,1-三(2-甲基-4-羥基苯基)乙烷、1,1,1-三(3-甲基-4-羥基苯基)甲烷、1,1,1-三(3-甲基-4-羥基苯基)乙烷、1,1,1-三(3,5-二甲基-4-羥基苯基)甲烷、1,1,1-三(3,5-二甲基-4-羥基苯基)乙烷、1,1,1-三(3-氯-4-羥基苯基)甲烷、1,1,1-三(3-氯-4-羥基苯基)乙烷、1,1,1-三(3,5-二氯-4-羥基苯基)甲烷、1,1,1-三(3,5-二氯-4-羥基苯基)乙烷、1,1,1-三(3-溴-4-羥基苯基)甲烷、1,1,1-三(3-溴-4-羥基苯基)乙烷、1,1,1-三(3,5-二溴-4-羥基苯基)甲烷、1,1,1-三(3,5-二溴-4-羥基苯基)乙烷、4,4’-二羥基-2,5-二羥基二苯醚等。 The branched polycarbonate resin is a polycarbonate resin produced by using a branching agent, and examples of the branching agent include phloroglucinol, trimellitic acid, and 1,1,1-tris(4- Hydroxyphenyl)ethane, 1,1,2-tris(4-hydroxyphenyl)ethane, 1,1,2-tris(4-hydroxyphenyl)propane, 1,1,1-tris(4- Hydroxyphenyl)methane, 1,1,1-tris(4-hydroxyphenyl)propane, 1,1,1-tris(2-methyl-4-hydroxyphenyl)methane, 1,1,1-three (2-methyl-4-hydroxyphenyl)ethane, 1,1,1-tris(3-methyl-4-hydroxyphenyl)methane, 1,1,1-tris(3-methyl-4 -hydroxyphenyl)ethane, 1,1,1-tris(3,5-dimethyl-4-hydroxyphenyl)methane, 1,1,1-tris(3,5-dimethyl-4- Hydroxyphenyl)ethane, 1,1,1-tris(3-chloro-4-hydroxyphenyl)methane, 1,1,1-tris(3-chloro-4-hydroxyphenyl)ethane, 1, 1,1-tris(3,5-dichloro-4-hydroxyphenyl)methane, 1,1,1-tris(3,5-dichloro-4-hydroxyphenyl)ethane, 1,1,1 -Tris(3-bromo-4-hydroxyphenyl)methane, 1,1,1-tris(3-bromo-4-hydroxyphenyl)ethane, 1,1,1-tris(3,5-dibromo 4-hydroxyphenyl)methane, 1,1,1-tris(3,5-dibromo-4-hydroxyphenyl)ethane, 4,4'-dihydroxy-2,5-dihydroxydiphenyl ether Wait.

例如，如日本專利公開公報特開平03-182524號中列舉的， 所述支鏈聚碳酸酯類樹脂可以通過如下方法製備得到：攪拌由芳香族雙酚類、所述支化劑和光氣得到的聚碳酸酯低聚物、芳香族雙酚類以及封端劑，以使包含它們的反應混合液形成湍流的方式邊對反應混合液進行攪拌邊使它們進行反應，在反應混合液的黏度升高時，加入鹼水溶液並使反應混合液形成層流進行反應。在聚碳酸酯類樹脂中，包含5重量%以上80重量%以下範圍的本發明的樹脂組合物的支鏈聚碳酸酯類樹脂，優選的是包含10重量%以上60重量%以下的範圍。這是由於：當支鏈聚碳酸酯類樹脂小於5重量%時，則存在拉伸黏度降低、在擠出成型中成型困難的問題；當超過80重量%時，則存在樹脂的剪切黏度升高、成型加工性降低的問題。 For example, as listed in Japanese Patent Laid-Open Publication No. Hei 03-182524, The branched polycarbonate resin can be obtained by agitating a polycarbonate oligomer obtained from an aromatic bisphenol, the branching agent, and phosgene, an aromatic bisphenol, and a blocking agent. The reaction mixture is stirred to form a turbulent flow, and the reaction mixture is stirred to cause a reaction. When the viscosity of the reaction mixture is increased, an aqueous alkali solution is added and the reaction mixture is formed into a laminar flow for reaction. In the polycarbonate resin, the branched polycarbonate resin containing the resin composition of the present invention in an amount of from 5% by weight to 80% by weight is preferably contained in a range of from 10% by weight to 60% by weight. This is because when the branched polycarbonate resin is less than 5% by weight, there is a problem that the tensile viscosity is lowered and molding is difficult in extrusion molding; when it exceeds 80% by weight, the shear viscosity of the resin is increased. High, the problem of reduced formability.

作為形成相位差膜2的環烯烴類樹脂，只要是具有由環狀烯烴(環烯烴)構成的單體單元的樹脂，就沒有特別的限定。作為在相位差膜2中使用的環烯烴類樹脂，可以是環烯烴聚合物(COP)或環烯烴共聚物(COC)的任一種，優選的是環烯烴共聚物。 The cycloolefin resin to form the retardation film 2 is not particularly limited as long as it is a resin having a monomer unit composed of a cyclic olefin (cycloolefin). The cycloolefin resin used in the retardation film 2 may be any of a cycloolefin polymer (COP) or a cyclic olefin copolymer (COC), and a cycloolefin copolymer is preferable.

所述環烯烴共聚物是指作為環狀烯烴與乙烯等烯烴的共聚物的非晶性環狀烯烴類樹脂。作為環狀烯烴，存在多環式的環狀烯烴和單環式的環狀烯烴。作為所述多環式的環狀烯烴，可以列舉降冰片烯、甲基降冰片烯、二甲基降冰片烯、乙基降冰片烯、乙叉降冰片烯、丁基降冰片烯、二環戊二烯、二氫二環戊二烯、甲基二環戊二烯、二甲基二環戊二烯、四環十二烯、甲基四環十二烯、二甲基四環十二烯、三環戊二烯、四環戊二烯等。此外，作為單環式的環狀烯烴，可以列舉環丁烯、環戊烯、環辛烯、環辛二烯、環辛三烯、環十二碳三烯等。 The cycloolefin copolymer refers to an amorphous cyclic olefin resin which is a copolymer of a cyclic olefin and an olefin such as ethylene. As the cyclic olefin, a polycyclic cyclic olefin and a monocyclic cyclic olefin are present. Examples of the polycyclic cyclic olefin include norbornene, methylnorbornene, dimethylnorbornene, ethylnorbornene, ethylidene norbornene, butylnorbornene, and bicyclic ring. Pentadiene, dihydrodicyclopentadiene, methyldicyclopentadiene, dimethyldicyclopentadiene, tetracyclododecene, methyltetracyclododecene, dimethyltetracyclodene Alkene, tricyclopentadiene, tetracyclopentadiene, and the like. Further, examples of the monocyclic cyclic olefin include cyclobutene, cyclopentene, cyclooctene, cyclooctadiene, cyclooctanetriene, and cyclododecatriene.

形成相位差膜2的丙烯酸類樹脂是具有來自丙烯酸或甲基丙烯酸的骨架的樹脂。作為丙烯酸類樹脂的例子，沒有特別的限定，可以列舉聚甲基丙烯酸甲酯等聚(甲基)丙烯酸酯、甲基丙烯酸甲酯-(甲基)丙烯酸共聚物、甲基丙烯酸甲酯-(甲基)丙烯 酸酯共聚物、甲基丙烯酸甲酯-丙烯酸酯-(甲基)丙烯酸共聚物、(甲基)丙烯酸甲酯-苯乙烯共聚物、具有脂環族烴基的聚合物(例如甲基丙烯酸甲酯-甲基丙烯酸環己酯共聚物、甲基丙烯酸甲酯-(甲基)丙烯酸降冰片基酯共聚物)等。在所述的丙烯酸類樹脂中，優選的是聚(甲基)丙烯酸甲酯等聚(甲基)丙烯酸的C1-6烷基酯，更優選的是甲基丙烯酸甲酯類樹脂。 The acrylic resin forming the retardation film 2 is a resin having a skeleton derived from acrylic acid or methacrylic acid. The example of the acrylic resin is not particularly limited, and examples thereof include poly(meth)acrylate such as polymethyl methacrylate, methyl methacrylate-(meth)acrylic acid copolymer, and methyl methacrylate-( Methyl) propylene Acid ester copolymer, methyl methacrylate-acrylate-(meth)acrylic acid copolymer, methyl (meth)acrylate-styrene copolymer, polymer having an alicyclic hydrocarbon group (such as methyl methacrylate) a cyclohexyl methacrylate copolymer, a methyl methacrylate-norbornyl (meth)acrylate copolymer, and the like. Among the acrylic resins, a C1-6 alkyl poly(meth)acrylate such as poly(methyl) acrylate is preferable, and a methyl methacrylate resin is more preferable.

作為相位差膜2的鉛筆硬度，雖然沒有特別的限定，但是例如為了能進一步提高加上硬塗層後的硬度，優選的是相位差膜2的鉛筆硬度越高越好，可以為8B以上2B以下。即使相位差膜2的鉛筆硬度在所述範圍內，所述光學片1通過第一硬塗層4和第二硬塗層5，也能將另一個面側的鉛筆硬度保持在2H以上6H以下的程度。 The pencil hardness of the retardation film 2 is not particularly limited. For example, in order to further increase the hardness after the hard coat layer is applied, it is preferable that the pencil hardness of the retardation film 2 is as high as possible, and may be 8 B or more and 2 B. the following. Even if the pencil hardness of the retardation film 2 is within the above range, the optical sheet 1 can pass the pencil hardness of the other surface side to 2H or more and 6H or less by the first hard coat layer 4 and the second hard coat layer 5. Degree.

作為相位差膜2的厚度，沒有特別的限定，例如優選的是20μm以上200μm以下。相位差膜2的厚度的上限值更優選的是150μm，特別優選的是100μm。另一方面，相位差膜2的厚度的下限值更優選的是30μm，特別優選的是50μm。在相位差膜2的厚度超過所述上限值的情況下，會導致製造時的生產線的速度及生產率降低，此外，在所述光學片1用於液晶顯示裝置的情況下，存在與對液晶顯示裝置提出的薄型化的要求相背的問題。相反，在相位差膜2的厚度小於所述下限值的情況下，存在強度及剛性變小、防止彎曲性能降低等問題。 The thickness of the retardation film 2 is not particularly limited, and is preferably, for example, 20 μm or more and 200 μm or less. The upper limit of the thickness of the retardation film 2 is more preferably 150 μm, and particularly preferably 100 μm. On the other hand, the lower limit of the thickness of the retardation film 2 is more preferably 30 μm, and particularly preferably 50 μm. When the thickness of the retardation film 2 exceeds the upper limit value, the speed and productivity of the production line at the time of production are lowered, and in the case where the optical sheet 1 is used for a liquid crystal display device, there is a pair of liquid crystals. The problem of thinning requirements proposed by the display device is contrary to the problem. On the other hand, when the thickness of the retardation film 2 is less than the lower limit value, there are problems such as a decrease in strength and rigidity and a decrease in bending performance.

作為相位差膜2的玻璃化轉變溫度雖然沒有特別的限定，但是優選的是例如在120℃以上180℃以下。相位差膜2的玻璃化轉變溫度的上限值更優選的是160℃，進一步優選的是140℃。另一方面，相位差膜2的玻璃化轉變溫度的下限值更優選的是140℃，進一步優選的是160℃。在相位差膜2的玻璃化轉變溫度超過所述上限值的情況下，存在有在膜延伸時容易產生延伸不均且難以熱成型的問題。相反，在相位差膜2的玻璃化轉變溫度小於所述下 限值的情況下，存在耐熱性能惡化的問題。 The glass transition temperature of the retardation film 2 is not particularly limited, but is preferably, for example, 120 ° C or more and 180 ° C or less. The upper limit of the glass transition temperature of the retardation film 2 is more preferably 160 ° C, and still more preferably 140 ° C. On the other hand, the lower limit of the glass transition temperature of the retardation film 2 is more preferably 140 ° C, and still more preferably 160 ° C. When the glass transition temperature of the retardation film 2 exceeds the above upper limit value, there is a problem that elongation unevenness is likely to occur at the time of film extension and it is difficult to thermoform. On the contrary, the glass transition temperature of the retardation film 2 is smaller than the above In the case of the limit value, there is a problem that the heat resistance is deteriorated.

作為相位差膜2的製造方法，沒有特別的限定，可以通過對以透明性高分子為主要成分的組合物進行製膜、拉伸來製造相位差膜2。 The method for producing the retardation film 2 is not particularly limited, and the retardation film 2 can be produced by forming and stretching a composition containing a transparent polymer as a main component.

作為所述的製膜方法沒有特別的限定，可以例舉的有溶劑澆鑄法、熔融擠出法、壓延法等習知的成膜方法。 The film forming method is not particularly limited, and examples thereof include a conventional film forming method such as a solvent casting method, a melt extrusion method, and a calendering method.

此外，作為在從模具擠出溶液的澆鑄法和刮刀法等溶劑澆鑄法中使用的溶劑，可以例舉的有二氯甲烷、三氯甲烷、二氧戊環、甲苯、二甲基甲醯胺、N-甲基吡咯烷酮等有機溶劑。溶液濃度例如優選的是10品質%以上，更優選的是15品質%以上。 Further, as a solvent used in a solvent casting method such as a casting method and a doctor blade method for extruding a solution from a die, dichloromethane, chloroform, dioxolane, toluene, dimethylformamide may be exemplified. An organic solvent such as N-methylpyrrolidone. The solution concentration is preferably, for example, 10% by mass or more, and more preferably 15% by mass or more.

另一方面，熔融擠出法由於不使用溶劑，所以生產率高。因此優選的是通過熔融擠出法製造相位差膜2。 On the other hand, the melt extrusion method has high productivity because no solvent is used. Therefore, it is preferred to produce the retardation film 2 by a melt extrusion method.

作為熔融擠出法的製造方法，可以例舉的有：通過溶液混合法或熔融混合法等製備組合物，然後將組合物熔融擠出，由此進行成膜的方法；以及通過把組合物的幹混合物直接熔融擠出進行成膜的方法，等等。 The method for producing the melt extrusion method may be a method in which a composition is prepared by a solution mixing method, a melt mixing method, or the like, and then the composition is melt-extruded to thereby form a film; and The dry mixture is directly melt extruded to form a film, and the like.

作為溶液混合法，可以例舉下述方法等，所述方法為：把透明性高分子和根據需要添加的任意的添加劑分別溶解在溶劑中，混合均勻後，根據需要通過過濾(篩檢程式過濾等)去除異物，進而通過把溶液注入到所述透明性高分子的不溶性溶劑(或不良溶劑)中，由此回收組合物，進而進行乾燥，得到作為目標物的組合物(溶液混合)。 The solution mixing method may be a method in which a transparent polymer and an optional additive added as needed are dissolved in a solvent, mixed uniformly, and filtered by a screening program as needed. The foreign matter is removed, and the solution is injected into the insoluble solvent (or poor solvent) of the transparent polymer to recover the composition, and further dried to obtain a composition (solution mixture) as a target.

作為熔融混合法，可以例舉下述的方法：把透明性高分子和根據需要添加的任意的添加劑，根據需要混合，然後通過熔融混合(熔融混煉)得到組合物。溶液混合物法可以得到熱歷史少的組合物，但針對組合物使用大量的溶劑，存在有在組合物中殘留溶劑的問題。熔融混合法沒有溶劑的問題，並且在經濟方面也是有利的，所以優選熔融混合法。 The melt-mixing method may be a method in which a transparent polymer and an optional additive added as needed are mixed as needed, and then melt-mixed (melt-kneaded) to obtain a composition. The solution mixture method can obtain a composition having a small heat history, but a large amount of a solvent is used for the composition, and there is a problem that a solvent remains in the composition. The melt mixing method has no problem of a solvent and is also economically advantageous, so a melt mixing method is preferred.

作為通過對將透明性高分子作為主要成分的組合物的幹混合物進行直接熔融擠出來成膜的方法，可以例舉下述的方法：使用V型混合器、亨舍爾混合機、機械化學裝置等預混合裝置，對以透明性高分子為主要成分的組合物進行充分混合後，根據需要通過擠出造粒機或制團機等進行造粒，並用排氣口式雙螺杆擠出機等熔融擠出機對混合物進行熔融混煉，然後從扁模具(T模具)擠出熔融混煉後的混合物，由此進行熔融成膜。此外，在通過把幹混合物直接熔融擠出來成膜的方法中，也可以把各成分的一部分預混合後，將混合後的混合物以與剩餘的成分獨立的方式提供給熔融擠出機。 As a method of forming a film by direct melt extrusion of a dry mixture of a composition containing a transparent polymer as a main component, a method of using a V-type mixer, a Henschel mixer, or a mechanical chemical device can be exemplified. In the pre-mixing device, the composition containing the transparent polymer as a main component is sufficiently mixed, and then granulated by an extrusion granulator or a pelletizing machine as necessary, and a vented twin-screw extruder or the like is used. The mixture is melt-kneaded by a melt extruder, and then the melt-kneaded mixture is extruded from a flat mold (T-die) to melt-form the film. Further, in the method of forming a film by directly melt-extruding the dry mixture, a part of each component may be pre-mixed, and the mixed mixture may be supplied to the melt extruder in a manner independent of the remaining components.

為了得到均勻的相位差膜2，作為熔融擠出機，可以使用無排氣口方式的熔融擠出機。此外，也可以使用具有能把原料中的水分和從熔融混煉樹脂產生的揮發氣體排出的排氣口的熔融擠出機。優選的是在排氣口設置有用於高效地把產生的水分和揮發氣體排出到熔融擠出機外部的真空泵。此外，也可以把用於去除混入擠出原料中的異物等的網，設置在熔融擠出機的模具部之前的區域，由此除去異物。作為所述的網可以例舉的有金屬網、換網器、燒結金屬板(盤篩檢程式等)等。 In order to obtain a uniform retardation film 2, a melt extruder having no vent method can be used as the melt extruder. Further, a melt extruder having an exhaust port capable of discharging moisture in the raw material and volatile gas generated from the melt-kneaded resin may be used. It is preferable that a vacuum pump for efficiently discharging the generated moisture and volatile gas to the outside of the melt extruder is provided at the exhaust port. Further, a net for removing foreign matter or the like mixed in the extruded raw material may be placed in a region before the mold portion of the melt extruder to remove foreign matter. Examples of the mesh include a metal mesh, a screen changer, a sintered metal plate (a disk screening program, etc.).

在設組合物的玻璃化轉變溫度為Tg時，熔融擠出時的樹脂溫度優選的是Tg以上，更優選的是Tg+50℃~Tg+250℃，進一步優選的是Tg+80℃~Tg+200℃。也可以在成膜的同時或緊接著成膜連續地進行拉伸，可以使相位差膜2成為所希望的1/4波長膜。此外，也可以把通過所述的成膜方法得到的膜另外進行拉伸，從而使相位差膜2成為1/4波長膜。 When the glass transition temperature of the composition is Tg, the resin temperature at the time of melt extrusion is preferably Tg or more, more preferably Tg + 50 ° C to Tg + 250 ° C, still more preferably Tg + 80 ° C - Tg +200 ° C. The film may be continuously stretched at the same time as the film formation or immediately after the film formation, and the retardation film 2 may be a desired 1/4 wavelength film. Further, the film obtained by the film formation method described above may be further stretched to form the retardation film 2 as a 1/4 wavelength film.

在對組合物進行製膜後，可以通過單軸拉伸得到相位差膜2。作為單軸拉伸方法，可以使用利用拉幅機法的橫向單軸拉伸、在輥之間的縱向單軸拉伸、在輥之間的壓延法等任意的方法。拉伸倍率通常可以根據膜的拉伸性能和光學特性(例如折射率分佈、 面內相位差值、厚度方向相位差值、Nz係數)等，在1.01~5倍的範圍內實施。所述拉伸可以以一個階段進行，也可以分多個階段進行。此外，拉伸時的溫度為Tg-30℃~Tg+50℃，更優選的是Tg-30℃~Tg+30℃。如果拉伸時的溫度在所述溫度範圍內，則聚合物的分子運動適度，不易發生因拉伸造成的定向緩和，定向控制變得容易，容易得到所希望的光學特性，所以是優選的。 After the composition is formed into a film, the retardation film 2 can be obtained by uniaxial stretching. As the uniaxial stretching method, any method such as transverse uniaxial stretching by a tenter method, longitudinal uniaxial stretching between rolls, and calendering between rolls can be used. The draw ratio can generally be based on the tensile properties and optical properties of the film (eg, refractive index profile, The in-plane phase difference value, the thickness direction phase difference value, and the Nz coefficient are performed in the range of 1.01 to 5 times. The stretching may be carried out in one stage or in multiple stages. Further, the temperature at the time of stretching is Tg-30 ° C to Tg + 50 ° C, and more preferably Tg -30 ° C to Tg + 30 ° C. When the temperature at the time of stretching is within the above temperature range, the molecular motion of the polymer is moderate, the orientation relaxation due to stretching is less likely to occur, the orientation control is facilitated, and desired optical characteristics are easily obtained, which is preferable.

硬塗層3 Hard coating 3

硬塗層3包括第一硬塗層4和第二硬塗層5。作為硬塗層3的厚度，雖然沒有特別的限定，但是優選的是21μm以上105μm以下。硬塗層3的厚度的上限值更優選的是82μm，進一步優選的是63μm。另一方面，硬塗層3的厚度的下限值更優選的是32μm，進一步優選的是43μm。在硬塗層3的厚度超過所述上限值的情況下，基本上不能促進防止產生捲曲的作用，並且存在與對所述光學片1提出的薄型化的要求相背的問題。相反，在硬塗層3的厚度小於所述下限值的情況下，存在不能有效地防止產生捲曲的問題。 The hard coat layer 3 includes a first hard coat layer 4 and a second hard coat layer 5. The thickness of the hard coat layer 3 is not particularly limited, but is preferably 21 μm or more and 105 μm or less. The upper limit of the thickness of the hard coat layer 3 is more preferably 82 μm, still more preferably 63 μm. On the other hand, the lower limit of the thickness of the hard coat layer 3 is more preferably 32 μm, still more preferably 43 μm. In the case where the thickness of the hard coat layer 3 exceeds the above upper limit value, the effect of preventing the occurrence of curling is substantially not promoted, and there is a problem that the requirement for thinning of the optical sheet 1 is reversed. On the contrary, in the case where the thickness of the hard coat layer 3 is less than the lower limit value, there is a problem that curling cannot be effectively prevented.

第一硬塗層4 First hard coat 4

第一硬塗層4形成於相位差膜2的一個面。第一硬塗層4可以僅由樹脂形成，也可以含有抗紫外線劑等添加劑。作為構成第一硬塗層4的主要成分，沒有特別的限定，可以例舉活性能量線固化樹脂或由反應性矽化合物形成的樹脂等。作為活性能量線固化樹脂，可以列舉紫外線固化性樹脂、電子束固化性樹脂、放射線固化性樹脂等。此外，作為反應性矽化合物，可以列舉四乙氧基矽烷等。其中，作為第一硬塗層4的主要成分，優選的是紫外線固化性樹脂。通過使用紫外線固化性樹脂作為第一硬塗層4的主要成分，所述光學片1能夠提高易製造性。此外，所述光學片1通過使用紫外線固化性樹脂作為第一硬塗層4的主要成分，在製造時等，能夠防止由於對相位差膜2施加熱量而產生的熱膨脹或 熱收縮，從而能夠提高尺寸穩定性。作為所述紫外線固化性樹脂，可以列舉自由基聚合性樹脂、陽離子聚合性樹脂等。 The first hard coat layer 4 is formed on one face of the retardation film 2. The first hard coat layer 4 may be formed only of a resin, or may contain an additive such as an ultraviolet ray inhibitor. The main component constituting the first hard coat layer 4 is not particularly limited, and examples thereof include an active energy ray-curable resin or a resin formed of a reactive ruthenium compound. Examples of the active energy ray-curable resin include an ultraviolet curable resin, an electron beam curable resin, and a radiation curable resin. Further, examples of the reactive hydrazine compound include tetraethoxydecane. Among them, as the main component of the first hard coat layer 4, an ultraviolet curable resin is preferable. By using an ultraviolet curable resin as a main component of the first hard coat layer 4, the optical sheet 1 can improve ease of manufacture. Further, by using the ultraviolet curable resin as the main component of the first hard coat layer 4, the optical sheet 1 can prevent thermal expansion or the like due to application of heat to the retardation film 2 at the time of manufacture or the like. Heat shrinkage, which improves dimensional stability. Examples of the ultraviolet curable resin include a radical polymerizable resin and a cationically polymerizable resin.

作為形成所述紫外線固化性樹脂的紫外線聚合性化合物，可以使用通過紫外線能進行聚合、交聯等反應而固化的單體或低聚物。 As the ultraviolet ray-polymerizable compound which forms the ultraviolet curable resin, a monomer or oligomer which is cured by a reaction such as polymerization or crosslinking by ultraviolet light can be used.

作為所述單體，可以列舉自由基聚合性單體、陽離子聚合性單體。此外，作為所述低聚物，可以列舉自由基聚合性低聚物、陽離子聚合性低聚物。 Examples of the monomer include a radical polymerizable monomer and a cationically polymerizable monomer. Further, examples of the oligomer include a radical polymerizable oligomer and a cationic polymerizable oligomer.

作為所述自由基聚合性單體，可以例舉(甲基)丙烯酸甲酯、(甲基)丙烯酸丁酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸月桂酯、(甲基)丙烯酸異冰片酯、(甲基)丙烯酸二環戊烯酯等單官能(甲基)丙烯酸酯類；二(甲基)丙烯酸二丙二醇酯、二(甲基)丙烯酸1,6-己二醇酯、二(甲基)丙烯酸新戊二醇酯、三(甲基)丙烯酸三羥甲基丙烷酯、三(甲基)丙烯酸季戊四醇酯、四(甲基)丙烯酸季戊四醇酯、五(甲基)丙烯酸二季戊四醇酯、六(甲基)丙烯酸二季戊四醇酯等多官能(甲基)丙烯酸酯類等各種(甲基)丙烯酸酯。 The radical polymerizable monomer may, for example, be methyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate or lauryl (meth)acrylate, ( Monofunctional (meth) acrylates such as isobornyl methyl methacrylate and dicyclopentenyl (meth) acrylate; dipropylene glycol di(meth)acrylate; 1,6-hexyl di(meth)acrylate Glycol ester, neopentyl glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, five (a) Various (meth) acrylates such as polyfunctional (meth) acrylates such as dipentaerythritol acrylate and dipentaerythritol hexa(meth)acrylate.

作為所述陽離子聚合性單體，可以例舉3,4-環氧環己烯基甲基-3’,4’-環氧環己烯基羧酸等脂環式環氧化物類、雙酚A二縮水甘油醚等縮水甘油醚類、4-羥基丁基乙烯基醚等乙烯基醚類、3-乙基-3-羥基甲基氧雜環丁烷等氧雜環丁烷類等。 The cationically polymerizable monomer may, for example, be an alicyclic epoxide such as 3,4-epoxycyclohexenylmethyl-3',4'-epoxycyclohexenylcarboxylic acid or bisphenol A glycidyl ether such as A diglycidyl ether, a vinyl ether such as 4-hydroxybutyl vinyl ether or an oxetane such as 3-ethyl-3-hydroxymethyloxetane.

作為所述自由基聚合性低聚物，可以例舉聚氨酯(甲基)丙烯酸酯、環氧(甲基)丙烯酸酯、聚酯(甲基)丙烯酸酯、三嗪(甲基)丙烯酸酯、矽(甲基)丙烯酸酯等各種(甲基)丙烯酸酯低聚物；三羥甲基丙烷三巰基乙酸酯、季戊四醇四巰基乙酸酯等聚硫醇類低聚物；不飽和聚酯低聚物等。 The radical polymerizable oligomer may, for example, be urethane (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, triazine (meth) acrylate or oxime. Various (meth) acrylate oligomers such as (meth) acrylate; polythiol oligomers such as trimethylolpropane tridecyl acetate and pentaerythritol tetradecyl acetate; oligomerization of unsaturated polyester Things and so on.

作為所述陽離子聚合性低聚物，可以例舉酚醛型環氧樹脂低聚物、芳香族乙烯基醚類樹脂低聚物等。 The cationically polymerizable oligomer may, for example, be a novolac epoxy resin oligomer or an aromatic vinyl ether resin oligomer.

其中，作為形成用於第一硬塗層4的紫外線固化性樹脂的紫外線聚合性化合物，優選的是陽離子聚合性單體或陽離子聚合性低聚物。所述光學片1使用紫外線固化性樹脂作為第一硬塗層4的主要成分，並且通過使用陽離子聚合性單體或陽離子聚合性低聚物作為形成所述紫外線固化性樹脂的紫外線聚合性化合物，可以提高相位差膜2與第一硬塗層4的黏合性，並且可以抑制黏合力隨時間產生變化。此外，所述光學片1通過該結構，能夠防止第一硬塗層4固化收縮，從而能夠進一步提高尺寸穩定性。 Among these, as the ultraviolet polymerizable compound forming the ultraviolet curable resin for the first hard coat layer 4, a cationically polymerizable monomer or a cationically polymerizable oligomer is preferable. The optical sheet 1 uses an ultraviolet curable resin as a main component of the first hard coat layer 4, and a cationically polymerizable monomer or a cationically polymerizable oligomer is used as the ultraviolet polymerizable compound forming the ultraviolet curable resin. The adhesion of the retardation film 2 to the first hard coat layer 4 can be improved, and the change in the adhesive force with time can be suppressed. Further, with this configuration, the optical sheet 1 can prevent the first hard coat layer 4 from being cured and shrunk, and the dimensional stability can be further improved.

此外，根據所要求的性能等，可以把兩種以上的所述單體和低聚物混合使用。 Further, two or more of the above monomers and oligomers may be used in combination depending on the desired properties and the like.

此外，作為形成用於第一硬塗層4的紫外線固化性樹脂的紫外線聚合性化合物，還優選使用固化收縮低的自由基聚合性化合物。作為該自由基聚合性化合物，可以例舉分子量為1000~3000的聚甲基丙烯醯氧基丙基倍半矽氧烷( )。此外，作為具有所述的自由基聚合性化合物的紫外線固化性樹脂，也可以使用例如在日本專利公開公報特開2008-120845號中列舉的自由基聚合性樹脂。 Further, as the ultraviolet ray-polymerizable compound which forms the ultraviolet curable resin for the first hard coat layer 4, it is also preferred to use a radically polymerizable compound having a low curing shrinkage. The radical polymerizable compound may, for example, be a polymethacryloxypropyl sesquioxane having a molecular weight of 1,000 to 3,000 ( ). In addition, as the ultraviolet curable resin having the above-mentioned radically polymerizable compound, a radical polymerizable resin exemplified in Japanese Laid-Open Patent Publication No. 2008-120845 can be used.

作為第一硬塗層4中所含的聚合引發劑，在紫外線聚合性化合物是自由基聚合性的單體或低聚物的情況下，可以列舉二苯甲酮類、噻噸酮類、苯偶姻類、苯乙酮類等化合物。此外，作為第一硬塗層4中所含的聚合引發劑，在紫外線聚合性化合物是陽離子聚合性單體或低聚物的情況下，可以列舉茂金屬()類、芳香族鋶類、芳香族碘鎓類等化合物。 The polymerization initiator contained in the first hard coat layer 4 may be a benzophenone, a thioxanthone or a benzene when the ultraviolet polymerizable compound is a radical polymerizable monomer or oligomer. Compounds such as acetoin and acetophenone. In addition, as a polymerization initiator contained in the first hard coat layer 4, in the case where the ultraviolet polymerizable compound is a cationically polymerizable monomer or oligomer, a metallocene may be mentioned ( Compounds such as aromatic steroids and aromatic iodonium.

作為所述聚合引發劑的含量，沒有特別的限定，相對於紫外線固化性樹脂，優選的是1品質%以上10品質%以下，更優選的是3品質%以上6品質%以下。在聚合引發劑的含量超過所述上限值的情況下，紫外線固化性樹脂的聚合度降低，存在不能獲得所希望的硬度的問題。相反，在聚合引發劑的含量小於所述下限 值的情況下，存在不能充分進行固化反應的問題。 The content of the polymerization initiator is not particularly limited, and is preferably 1% by mass or more and 10% by mass or less, and more preferably 3% by mass or more and 6% by mass or less, based on the ultraviolet curable resin. When the content of the polymerization initiator exceeds the above upper limit, the degree of polymerization of the ultraviolet curable resin is lowered, and there is a problem that a desired hardness cannot be obtained. Conversely, the content of the polymerization initiator is less than the lower limit In the case of a value, there is a problem that the curing reaction cannot be sufficiently performed.

此外，為了提高塗佈性，第一硬塗層4還可以含有溶劑。作為該溶劑，可以例舉己烷、辛烷等脂肪族烴；甲苯、二甲苯等芳香族烴；乙醇、1-丙醇、異丙醇、1-丁醇等醇類；甲乙酮、甲基異丁基酮等酮類；乙酸乙酯、乙酸丁酯、乙酸異丁酯等酯類；乙二醇單甲醚、乙二醇單***、二乙二醇單***、丙二醇單甲醚、丙二醇單***等二醇醚類；乙二醇單甲醚乙酸酯、丙二醇單甲醚乙酸酯等酯化二醇醚類等有機溶劑。這些有機溶劑可以單獨使用，根據需要，也可以將多種混合使用。此外，優選的是，在第一硬塗層4的製造工序中，使所述溶劑蒸發、乾燥。因此，所述溶劑的沸點優選的是60℃以上160℃以下。此外，所述溶劑在20℃下的飽和蒸汽壓為0.1kPa以上20kPa以下。對於溶劑的種類和含量，可以根據相位差膜2的主要成分、第一硬塗層4的主要成分及厚度等進行適當調整。 Further, in order to improve coatability, the first hard coat layer 4 may further contain a solvent. The solvent may, for example, be an aliphatic hydrocarbon such as hexane or octane; an aromatic hydrocarbon such as toluene or xylene; or an alcohol such as ethanol, 1-propanol, isopropanol or 1-butanol; methyl ethyl ketone or methyl isophthalate; Ketones such as butyl ketone; esters such as ethyl acetate, butyl acetate, isobutyl acetate; ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol An organic solvent such as a glycol ether such as diethyl ether or an esterified glycol ether such as ethylene glycol monomethyl ether acetate or propylene glycol monomethyl ether acetate. These organic solvents may be used singly or in combination of a plurality of them as needed. Further, it is preferable that the solvent is evaporated and dried in the manufacturing process of the first hard coat layer 4. Therefore, the boiling point of the solvent is preferably 60 ° C or more and 160 ° C or less. Further, the solvent has a saturated vapor pressure at 20 ° C of 0.1 kPa or more and 20 kPa or less. The type and content of the solvent can be appropriately adjusted depending on the main component of the retardation film 2, the main component of the first hard coat layer 4, the thickness, and the like.

第一硬塗層4還可以含有抗紫外線劑。作為第一硬塗層4中所含的抗紫外線劑，可以例舉紫外線吸收劑、紫外線穩定劑等。 The first hard coat layer 4 may also contain an ultraviolet resistant agent. The ultraviolet ray inhibitor contained in the first hard coat layer 4 may, for example, be an ultraviolet absorber or a UV stabilizer.

作為所述紫外線吸收劑，可以例舉水楊酸類紫外線吸收劑、二苯甲酮類紫外線吸收劑、苯並***類紫外線吸收劑、氰基丙烯酸酯類紫外線吸收劑、三嗪類紫外線吸收劑、苯並惡嗪酮類紫外線吸收劑等，可以使用選自所述的紫外線吸收劑中的一種或兩種以上。其中，從分散性的觀點出發，優選的是三嗪類紫外線吸收劑、苯並惡嗪酮類紫外線吸收劑。此外，作為所述紫外線吸收劑，優選的是使用在分子鏈中具有紫外線吸收基團的聚合物。通過使用該在分子鏈中具有紫外線吸收基團的聚合物，能防止由於紫外線吸收劑的滲出等導致的紫外線吸收功能的惡化。作為所述的紫外線吸收基團，可以列舉苯並***基、二苯甲酮基、氰基丙烯酸酯基、三嗪基、水楊酸基、苯亞甲基丙二酸酯基等。其中，特別優選的是苯並***基、二苯甲酮基、三嗪基。 Examples of the ultraviolet absorber include a salicylic acid ultraviolet absorber, a benzophenone ultraviolet absorber, a benzotriazole ultraviolet absorber, a cyanoacrylate ultraviolet absorber, and a triazine ultraviolet absorber. The benzoxazinone-based ultraviolet absorber or the like may be one or more selected from the group consisting of the above-mentioned ultraviolet absorbers. Among them, from the viewpoint of dispersibility, a triazine-based ultraviolet absorber and a benzoxazinone-based ultraviolet absorber are preferable. Further, as the ultraviolet absorber, it is preferred to use a polymer having an ultraviolet absorbing group in a molecular chain. By using the polymer having an ultraviolet absorbing group in the molecular chain, deterioration of the ultraviolet absorbing function due to bleeding of the ultraviolet absorbing agent or the like can be prevented. Examples of the ultraviolet absorbing group include a benzotriazole group, a benzophenone group, a cyanoacrylate group, a triazine group, a salicylic acid group, and a benzylidenemalonate group. Among them, benzotriazolyl, benzophenone, and triazinyl are particularly preferable.

作為所述紫外線穩定劑，優選的是使用例如對紫外線穩定性高的受阻胺類紫外線穩定劑。通過使第一硬塗層4含有紫外線穩定劑，能使因紫外線產生的自由基、活性氧等惰化，從而提高針對紫外線的穩定性、耐候性等。另外，第一硬塗層4如果並用紫外線吸收劑和紫外線穩定劑，能夠大幅提高針對紫外線的光劣化防止性能和耐候性。 As the ultraviolet stabilizer, it is preferred to use, for example, a hindered amine-based ultraviolet stabilizer which is highly stable to ultraviolet rays. When the first hard coat layer 4 contains an ultraviolet stabilizer, inertia, active oxygen, or the like generated by ultraviolet rays can be inerted, thereby improving stability against ultraviolet rays, weather resistance, and the like. Further, when the first hard coat layer 4 is used together with the ultraviolet absorber and the ultraviolet stabilizer, the photodegradation prevention performance against ultraviolet rays and the weather resistance can be greatly improved.

作為抗紫外線劑相對於第一硬塗層4的主要成分的含量(品質比)，雖然沒有特別的限定，但是優選的是0.1品質%以上10品質%以下。抗紫外線劑相對於第一硬塗層4的主要成分的含量的上限更優選的是8品質%，進一步優選的是5品質%。另一方面，抗紫外線劑相對於第一硬塗層4的主要成分的含量的下限更優選的是1品質%，進一步優選的是3品質%。在抗紫外線劑相對於所述光學片1的第一硬塗層4的主要成分的含量超過所述上限的情況下，存在第一硬塗層4的耐久性等降低的問題。相反，在抗紫外線劑相對於所述光學片1的第一硬塗層4的主要成分的含量小於所述下限的情況下，存在第一硬塗層4不能有效地實現抗紫外線功能的問題。 The content (quality ratio) of the main component of the first hard coat layer 4 as the anti-UV agent is not particularly limited, but is preferably 0.1% by mass or more and 10% by mass or less. The upper limit of the content of the ultraviolet ray-resistant agent relative to the main component of the first hard coat layer 4 is more preferably 8% by mass, still more preferably 5% by mass. On the other hand, the lower limit of the content of the ultraviolet ray-resistant agent relative to the main component of the first hard coat layer 4 is more preferably 1% by mass, and still more preferably 3% by mass. In the case where the content of the main component of the first hard coat layer 4 of the optical sheet 1 exceeds the upper limit, the durability of the first hard coat layer 4 or the like may be lowered. On the contrary, in the case where the content of the main component of the ultraviolet ray resistant agent with respect to the first hard coat layer 4 of the optical sheet 1 is less than the lower limit, there is a problem that the first hard coat layer 4 cannot effectively achieve the ultraviolet ray resistance function.

所述光學片1優選的是，第一硬塗層4含有紫外線固化性樹脂作為主要成分，並且含有抗紫外線劑。通常，在第一硬塗層4的主要成分是紫外線固化性樹脂、且第一硬塗層4含有抗紫外線劑的情況下，第一硬塗層4的固化速度變慢、生產率降低。然而，由於將所述光學片1的第一硬塗層4的厚度設定得較厚，因此即使將抗紫外線劑的濃度抑制為較小的濃度，也能使第一硬塗層4中含有足夠量的抗紫外線劑。因此，即使在第一硬塗層4中含有足夠量的抗紫外線劑的情況下，所述光學片1也能夠抑制第一硬塗層4的固化速度降低，從而能防止生產率降低。此外，在所述光學片1使用聚碳酸酯類樹脂作為相位差膜2的主要成分的情況下，通過使第一硬塗層4含有抗紫外線劑，能夠有效地防止相位 差膜2的黃變等。 In the optical sheet 1, it is preferable that the first hard coat layer 4 contains an ultraviolet curable resin as a main component and contains an ultraviolet ray-resistant agent. In general, when the main component of the first hard coat layer 4 is an ultraviolet curable resin and the first hard coat layer 4 contains an ultraviolet ray-resistant agent, the curing rate of the first hard coat layer 4 is slow and the productivity is lowered. However, since the thickness of the first hard coat layer 4 of the optical sheet 1 is set to be thick, even if the concentration of the ultraviolet resistant agent is suppressed to a small concentration, the first hard coat layer 4 can be sufficiently contained. Amount of anti-UV agent. Therefore, even in the case where the first hard coat layer 4 contains a sufficient amount of the ultraviolet resistant agent, the optical sheet 1 can suppress the decrease in the curing speed of the first hard coat layer 4, thereby preventing the productivity from being lowered. Further, when the optical sheet 1 is made of a polycarbonate resin as a main component of the retardation film 2, the first hard coat layer 4 contains an ultraviolet ray-resistant agent, and the phase can be effectively prevented. Yellowing of the poor film 2, etc.

第一硬塗層4的鉛筆硬度比第二硬塗層5的鉛筆硬度小。作為第一硬塗層4的鉛筆硬度，只要低於第二硬塗層5的鉛筆硬度，就沒有特別的限定，優選的是F以上2H以下。在第一硬塗層4的鉛筆硬度超出所述上限值的情況下，所述光學片1因相位差膜2和第一硬塗層4的硬度差產生捲曲的可能性變高。相反，在第一硬塗層4的鉛筆硬度小於所述下限值的情況下，存在所述光學片1不能獲得所希望的硬度的問題。 The pencil hardness of the first hard coat layer 4 is smaller than the pencil hardness of the second hard coat layer 5. The pencil hardness of the first hard coat layer 4 is not particularly limited as long as it is lower than the pencil hardness of the second hard coat layer 5, and is preferably F or more and 2H or less. In the case where the pencil hardness of the first hard coat layer 4 exceeds the upper limit value, the optical sheet 1 is likely to be curled due to the difference in hardness between the retardation film 2 and the first hard coat layer 4. On the contrary, in the case where the pencil hardness of the first hard coat layer 4 is less than the lower limit value, there is a problem that the optical sheet 1 cannot obtain a desired hardness.

第一硬塗層4的厚度為第二硬塗層5的厚度的4倍以上20倍以下。第一硬塗層4的厚度的上限更優選的是第二硬塗層5的厚度的18倍，進一步優選的是16倍。此外，第一硬塗層4的厚度的下限更優選的是第二硬塗層5的厚度的6倍，進一步優選的是8倍。在第一硬塗層4的厚度超過所述上限的情況下，存在不能進一步促進防止產生捲曲的作用的問題。相反，在第一硬塗層4的厚度小於所述下限的情況下，存在不能有效地防止產生捲曲的問題。 The thickness of the first hard coat layer 4 is 4 times or more and 20 times or less the thickness of the second hard coat layer 5. The upper limit of the thickness of the first hard coat layer 4 is more preferably 18 times the thickness of the second hard coat layer 5, and further preferably 16 times. Further, the lower limit of the thickness of the first hard coat layer 4 is more preferably 6 times the thickness of the second hard coat layer 5, further preferably 8 times. In the case where the thickness of the first hard coat layer 4 exceeds the upper limit, there is a problem that the effect of preventing curling cannot be further promoted. On the contrary, in the case where the thickness of the first hard coat layer 4 is smaller than the lower limit, there is a problem that curling cannot be effectively prevented.

此外，作為第一硬塗層4的厚度，雖然沒有特別的限定，但是優選的是20μm以上100μm以下。第一硬塗層4的厚度的上限值更優選的是80μm，進一步優選的是60μm。另一方面，第一硬塗層4的厚度的下限值更優選的是30μm，進一步優選的是40μm。在第一硬塗層4的厚度超過所述上限值的情況下，存在不能進一步促進防止產生捲曲作用的問題，也與對所述光學片1提出的薄型化的要求相背。相反，在第一硬塗層4的厚度小於所述下限值的情況下，存在不能有效地防止產生捲曲的問題。 Further, the thickness of the first hard coat layer 4 is not particularly limited, but is preferably 20 μm or more and 100 μm or less. The upper limit of the thickness of the first hard coat layer 4 is more preferably 80 μm, still more preferably 60 μm. On the other hand, the lower limit of the thickness of the first hard coat layer 4 is more preferably 30 μm, still more preferably 40 μm. In the case where the thickness of the first hard coat layer 4 exceeds the upper limit value, there is a problem that the curling prevention effect cannot be further promoted, and the requirement for the thinning of the optical sheet 1 is also reversed. On the contrary, in the case where the thickness of the first hard coat layer 4 is less than the lower limit value, there is a problem that curling cannot be effectively prevented.

作為第一硬塗層4的拉伸彈性率，雖然沒有特別的限定，但是優選的是1GPa以上4GPa以下。此外，作為第一硬塗層4的拉伸彈性率的上限值，更優選的是3.5GPa，進一步優選的是3GPa。另一方面，作為第一硬塗層4的拉伸彈性率的下限值，更優選的 是1.5GPa，進一步優選的是2GPa。在第一硬塗層4的拉伸彈性率超過所述上限值的情況下，存在不能有效地防止產生捲曲的問題。相反，在第一硬塗層4的拉伸彈性率小於所述下限值的情況下，存在所述光學片1難以形成所希望的硬度的問題。另外，本發明中的“拉伸彈性率”是根據JIS K7113測定得到的值。 The tensile modulus of elasticity of the first hard coat layer 4 is not particularly limited, but is preferably 1 GPa or more and 4 GPa or less. Further, as the upper limit of the tensile modulus of the first hard coat layer 4, it is more preferably 3.5 GPa, and still more preferably 3 GPa. On the other hand, as the lower limit of the tensile modulus of the first hard coat layer 4, more preferable It is 1.5 GPa, and further preferably 2 GPa. In the case where the tensile modulus of the first hard coat layer 4 exceeds the above upper limit value, there is a problem that curling cannot be effectively prevented. On the contrary, in the case where the tensile modulus of the first hard coat layer 4 is less than the lower limit value, there is a problem that the optical sheet 1 is difficult to form a desired hardness. Further, the "tensile modulus" in the present invention is a value measured in accordance with JIS K7113.

此外，將第一硬塗層4的拉伸彈性率乘以厚度的三次方得到的值優選的是20kPa‧mm3以上500 kPa‧mm3以下，更優選的是40kPa‧mm3以上400 kPa‧mm3以下，進一步優選的是60kPa‧mm3以上300 kPa‧mm3以下。在將第一硬塗層4的拉伸彈性率乘以厚度的三次方得到的值超出所述上限值的情況下，第一硬塗層4的剛性變得過大，存在難以將光學片1保持為輥狀的問題。相反，在將第一硬塗層4的拉伸彈性率乘以厚度的三次方得到的值小於所述下限值的情況下，存在第一硬塗層4容易變形、並且施加在相位差膜2上的應力變大的問題。 Further, the value obtained by multiplying the tensile modulus of the first hard coat layer 4 by the cube of the thickness is preferably 20 kPa ‧ mm 3 or more and 500 kPa ‧ mm 3 or less, and more preferably 40 kPa ‧ mm 3 or more and 400 kPa ‧ Mm 3 or less is more preferably 60 kPa ‧ mm 3 or more and 300 kPa ‧ mm 3 or less. In the case where the value obtained by multiplying the tensile modulus of the first hard coat layer 4 by the cube of the thickness exceeds the upper limit value, the rigidity of the first hard coat layer 4 becomes excessively large, and it is difficult to apply the optical sheet 1 Keep it in the shape of a roller. On the contrary, in the case where the value obtained by multiplying the tensile modulus of the first hard coat layer 4 by the cube of the thickness is smaller than the lower limit value, the first hard coat layer 4 is easily deformed and applied to the retardation film. The problem of the stress on 2 becomes large.

作為第一硬塗層4一個面側的表面的算術平均粗糙度(Ra)，雖然沒有特別的限定，但是優選的是0.5μm以上8μm以下。第一硬塗層4一個面側的表面的算術平均粗糙度(Ra)的上限值更優選的是7μm，進一步優選的是6μm。另一方面，第一硬塗層4一個面側的表面的算術平均粗糙度(Ra)的下限值更優選的是1μm，特別優選的是2μm。在第一硬塗層4一個面側的表面的算術平均粗糙度(Ra)超過所述上限值的情況下，存在有會使在第一硬塗層4另一個面側形成的第二硬塗層5的厚度變厚的問題。相反，在第一硬塗層4一個面側的表面的算術平均粗糙度(Ra)小於所述下限值的情況下，不能使第一硬塗層4一個面側的表面積足夠地增大，因此存在與第二硬塗層5的黏合性降低的問題。與此相對，在第一硬塗層4的一個面側表面的算術平均粗糙度(Ra)在所述範圍內的情況下，能夠使第二硬塗層5的厚度保持為合適的厚度，並且能有效地提高第一硬塗層4與第二硬塗層5 的黏合性。 The arithmetic mean roughness (Ra) of the surface on the one surface side of the first hard coat layer 4 is not particularly limited, but is preferably 0.5 μm or more and 8 μm or less. The upper limit of the arithmetic mean roughness (Ra) of the surface of one surface side of the first hard coat layer 4 is more preferably 7 μm, still more preferably 6 μm. On the other hand, the lower limit of the arithmetic mean roughness (Ra) of the surface on one surface side of the first hard coat layer 4 is more preferably 1 μm, and particularly preferably 2 μm. In the case where the arithmetic mean roughness (Ra) of the surface on one surface side of the first hard coat layer 4 exceeds the upper limit value, there is a second hard portion which is formed on the other surface side of the first hard coat layer 4. The problem that the thickness of the coating 5 becomes thick. On the other hand, in the case where the arithmetic mean roughness (Ra) of the surface on one surface side of the first hard coat layer 4 is smaller than the lower limit value, the surface area of the one surface side of the first hard coat layer 4 cannot be sufficiently increased. Therefore, there is a problem that the adhesion to the second hard coat layer 5 is lowered. On the other hand, in the case where the arithmetic mean roughness (Ra) of one surface side surface of the first hard coat layer 4 is within the above range, the thickness of the second hard coat layer 5 can be maintained to a proper thickness, and Effectively improving the first hard coat layer 4 and the second hard coat layer 5 Adhesion.

此外，作為第一硬塗層4一個面側的表面的十點平均粗糙度(Rz)，雖然沒有特別的限定，但是優選的是0.5μm以上10μm以下。第一硬塗層4一個面側的表面的十點平均粗糙度(Rz)的上限值更優選的是9μm，進一步優選的是8μm。另一方面，第一硬塗層4一個面側的表面的十點平均粗糙度(Rz)的下限值更優選的是1μm，進一步優選的是2μm。在第一硬塗層4一個面側的表面的十點平均粗糙度(Rz)超過所述上限的情況下，存在使第二硬塗層5的厚度變厚的可能性會變高的問題。相反，在第一硬塗層4一個面側的表面十的點平均粗糙度(Rz)小於所述下限的情況下，第一硬塗層4一個面側的表面積不會充分地增大，因此存在與第二硬塗層5的黏合性降低的問題。另外，“算術平均粗糙度(Ra)”和“十點平均粗糙度(RZ)”是根據JIS B0601-2001得到的值。 Further, the ten-point average roughness (Rz) of the surface on the one surface side of the first hard coat layer 4 is preferably 0.5 μm or more and 10 μm or less, although it is not particularly limited. The upper limit of the ten point average roughness (Rz) of the surface of one surface side of the first hard coat layer 4 is more preferably 9 μm, still more preferably 8 μm. On the other hand, the lower limit of the ten point average roughness (Rz) of the surface on one surface side of the first hard coat layer 4 is more preferably 1 μm, still more preferably 2 μm. When the ten-point average roughness (Rz) of the surface on one surface side of the first hard coat layer 4 exceeds the upper limit, there is a problem that the thickness of the second hard coat layer 5 is increased. On the other hand, in the case where the point average roughness (Rz) of the surface ten of one surface side of the first hard coat layer 4 is smaller than the lower limit, the surface area of the one surface side of the first hard coat layer 4 is not sufficiently increased, so There is a problem that the adhesion to the second hard coat layer 5 is lowered. In addition, "arithmetic mean roughness (Ra)" and "ten point average roughness (RZ)" are values obtained according to JIS B0601-2001.

第一硬塗層4的製造方法沒有特別的限定，可以通過在相位差膜2的一個面上塗佈活性能量線固化樹脂，使樹脂乾燥，照射活性能量線來製造第一硬塗層4。作為活性能量線固化樹脂的塗佈方法，只要是能在相位差膜2的一個面上均勻塗佈活性能量線固化樹脂的方法，就沒有特別的限定，可以列舉旋轉塗佈法、噴塗法、坡流塗佈法、浸漬法、棒塗法、輥塗法、絲網印刷法等各種方法。此外，在第一硬塗層4的製造中，根據需要，作為前處理，可以在氬氣或氮氣等不活潑性氣體氛圍下進行等離子體處理等表面改性處理。此外，還可以在相位差膜2的一個面上層疊底塗層，通過該底塗層層疊第一硬塗層4。 The method for producing the first hard coat layer 4 is not particularly limited, and the first hard coat layer 4 can be produced by applying an active energy ray-curable resin to one surface of the retardation film 2, drying the resin, and irradiating the active energy ray. The coating method of the active energy ray-curable resin is not particularly limited as long as it can uniformly apply the active energy ray-curable resin to one surface of the retardation film 2, and examples thereof include a spin coating method and a spray coating method. Various methods such as a slope coating method, a dipping method, a bar coating method, a roll coating method, and a screen printing method. Further, in the production of the first hard coat layer 4, as the pretreatment, a surface modification treatment such as plasma treatment may be performed under an inert gas atmosphere such as argon gas or nitrogen gas as needed. Further, an undercoat layer may be laminated on one side of the retardation film 2, and the first hard coat layer 4 is laminated through the undercoat layer.

第二硬塗層5 Second hard coat 5

第二硬塗層5形成在第一硬塗層4的一個面上。作為形成第二硬塗層5的材料，沒有特別的限定。第二硬塗層5可以僅由樹脂形成，也可以在其中含有二氧化矽微粒等添加劑。 The second hard coat layer 5 is formed on one face of the first hard coat layer 4. The material forming the second hard coat layer 5 is not particularly limited. The second hard coat layer 5 may be formed only of a resin, or may contain an additive such as cerium oxide fine particles therein.

作為形成第二硬塗層5的樹脂，可以例舉熱固性樹脂、活性能量線固化樹脂等。 The resin forming the second hard coat layer 5 may, for example, be a thermosetting resin, an active energy ray-curable resin or the like.

例如可以通過在第一硬塗層4的一個面上塗佈包含活性能量線固化樹脂的聚合性單體或聚合性低聚物的塗佈組合物，使聚合性單體或聚合性低聚物發生交聯反應和/或聚合反應，由此形成第二硬塗層5。 For example, a polymerizable monomer or a polymerizable oligomer can be applied by coating a coating composition containing a polymerizable monomer or a polymerizable oligomer of an active energy ray-curable resin on one surface of the first hard coat layer 4. A crosslinking reaction and/or a polymerization reaction occurs, thereby forming the second hard coat layer 5.

作為所述活性能量線固化性的聚合性單體或聚合性低聚物的官能團，優選的是紫外線、電子束或放射線聚合性的官能團，特別優選的是紫外線聚合性官能團。作為紫外線聚合性官能團，可以列舉(甲基)丙烯醯基、乙烯基、苯乙烯基、烯丙基等乙烯性不飽和聚合性官能團等。 The functional group of the active energy ray-curable polymerizable monomer or polymerizable oligomer is preferably an ultraviolet ray, an electron beam or a radiation polymerizable functional group, and particularly preferably an ultraviolet ray polymerizable functional group. Examples of the ultraviolet polymerizable functional group include an ethylenically unsaturated polymerizable functional group such as a (meth)acryl fluorenyl group, a vinyl group, a styryl group, and an allyl group.

作為所述的塗佈組合物，雖然沒有特別的限定，但是優選的是以丙烯酸類單體或聚氨酯丙烯酸酯低聚物作為主要成分的塗佈組合物。通過從以所述的單體或低聚物為主要成分的組合物形成第二硬塗層5，能夠提高第二硬塗層5的硬度。其中，特別優選的是從同時含有聚氨酯丙烯酸酯和(甲基)丙烯酸類化合物的組合物形成第二硬塗層5。 The coating composition is not particularly limited, but a coating composition containing an acrylic monomer or a urethane acrylate oligomer as a main component is preferable. The hardness of the second hard coat layer 5 can be improved by forming the second hard coat layer 5 from the composition containing the monomer or oligomer as a main component. Among them, it is particularly preferable to form the second hard coat layer 5 from a composition containing both a urethane acrylate and a (meth)acrylic compound.

作為形成第二硬塗層5的聚氨酯丙烯酸酯和(甲基)丙烯酸類化合物的總含量，優選的是45品質%以上99品質%以下，進一步優選的是50品質%以上95品質%以下，特別優選的是60品質%以上90品質%以下。形成第二硬塗層5的聚氨酯丙烯酸酯和(甲基)丙烯酸類化合物的總含量如果超過所述上限，則存在光聚合的開始變慢從而導致生產率降低的問題。此外，形成第二硬塗層5的聚氨酯丙烯酸酯和(甲基)丙烯酸類化合物的總含量如果小於所述下限，則存在柔軟性、耐磨損性、耐擦傷性等降低的問題。另一方面，形成第二硬塗層5的聚氨酯丙烯酸酯和(甲基)丙烯酸類化合物的總含量如果在所述範圍內，則能夠提高生產率，並且能夠很好地保持合適的柔軟性、耐磨損性及耐擦傷性等。 The total content of the urethane acrylate and the (meth)acrylic compound forming the second hard coat layer 5 is preferably 45% by mass or more and 99% by mass or less, and more preferably 50% by mass or more and 95% by mass or less, particularly Preferably, it is 60% by mass or more and 90% by mass or less. If the total content of the urethane acrylate and the (meth)acrylic compound forming the second hard coat layer 5 exceeds the upper limit, there is a problem that the start of photopolymerization becomes slow and the productivity is lowered. Further, if the total content of the urethane acrylate and the (meth)acrylic compound forming the second hard coat layer 5 is less than the lower limit, there is a problem that the flexibility, the abrasion resistance, the scratch resistance, and the like are lowered. On the other hand, if the total content of the urethane acrylate and the (meth)acrylic compound forming the second hard coat layer 5 is within the above range, the productivity can be improved, and the appropriate flexibility and resistance can be well maintained. Abrasion and scratch resistance.

作為所述的聚氨酯丙烯酸酯，沒有特別的限定，可以是單體或低聚物的任一種。此外，作為聚氨酯丙烯酸酯的官能團的數量，沒有特別的限定，可以是單官能團或多官能團，優選的是2官能團以上6官能團以下，進一步優選的是2官能團以上3官能團以下。通過使聚氨酯丙烯酸酯的官能團數在所述範圍內，能很好地保持第二硬塗層5的硬度與延伸率的平衡。聚氨酯丙烯酸酯可以單獨使用，也可以將兩種以上組合使用。 The urethane acrylate is not particularly limited and may be either a monomer or an oligomer. Further, the number of the functional groups of the urethane acrylate is not particularly limited, and may be a monofunctional group or a polyfunctional group, preferably a bifunctional group or more and a 6 functional group or less, and more preferably a bifunctional group or more and a trifunctional group or less. By setting the number of functional groups of the urethane acrylate within the above range, the balance of hardness and elongation of the second hard coat layer 5 can be well maintained. The urethane acrylate may be used singly or in combination of two or more.

作為由聚氨酯丙烯酸酯形成的樹脂的玻璃化轉變溫度，雖然沒有特別的限定，但是優選的是40℃以上100℃以下，進一步優選的是40℃以上80℃以下。通過使由聚氨酯丙烯酸酯形成的樹脂的玻璃化轉變溫度在所述範圍內，能夠提高常溫下的第二硬塗層5的硬度和耐久性。 The glass transition temperature of the resin formed of urethane acrylate is not particularly limited, but is preferably 40° C. or higher and 100° C. or lower, and more preferably 40° C. or higher and 80° C. or lower. By setting the glass transition temperature of the resin formed of urethane acrylate to the above range, the hardness and durability of the second hard coat layer 5 at normal temperature can be improved.

作為形成第二硬塗層5的聚氨酯丙烯酸酯的含量，雖然沒有特別的限定，但是優選的是10品質%以上90品質%以下，進一步優選的是15品質%以上85品質%以下，特別優選的是20品質%以上80品質%以下。形成第二硬塗層5的聚氨酯丙烯酸酯的含量如果超過所述上限，則存在耐磨損性和塗膜硬度降低的問題。此外，形成第二硬塗層5的聚氨酯丙烯酸酯的含量如果小於所述下限，則柔軟性降低，產生裂紋的可能性升高。另一方面，如果形成第二硬塗層5的聚氨酯丙烯酸酯的含量在所述範圍內，則能夠很好地保持合適的耐磨損性和塗膜硬度，並且能夠保持合適的柔軟性並能夠抑制產生裂紋。 The content of the urethane acrylate forming the second hard coat layer 5 is not particularly limited, but is preferably 10% by mass or more and 90% by mass or less, and more preferably 15% by mass or more and 85% by mass or less, and particularly preferably It is 20% by mass or more and 80% by mass or less. When the content of the urethane acrylate forming the second hard coat layer 5 exceeds the upper limit, there is a problem that abrasion resistance and coating film hardness are lowered. Further, if the content of the urethane acrylate forming the second hard coat layer 5 is less than the lower limit, the flexibility is lowered and the possibility of occurrence of cracks is increased. On the other hand, if the content of the urethane acrylate forming the second hard coat layer 5 is within the above range, proper abrasion resistance and film hardness can be well maintained, and appropriate flexibility can be maintained and Suppresses the generation of cracks.

作為所述的(甲基)丙烯酸類化合物，沒有特別的限定，可以是單體或低聚物的任一種。作為所述(甲基)丙烯酸類化合物的官能團的數量，沒有特別的限定，可以是單官能團或多官能團。另外，第二硬塗層5通過使用具有3官能團以上的(甲基)丙烯酸類化合物，能夠提高耐久性。此外，所述(甲基)丙烯酸類化合物可以是具有極性基團的分子結構，也可以是低極性的分子結 構。(甲基)丙烯酸類化合物可以單獨使用，也可以將兩種以上組合使用。 The (meth)acrylic compound is not particularly limited, and may be either a monomer or an oligomer. The number of the functional groups of the (meth)acrylic compound is not particularly limited, and may be a monofunctional group or a polyfunctional group. Further, the second hard coat layer 5 can improve durability by using a (meth)acrylic compound having a trifunctional group or more. Further, the (meth)acrylic compound may be a molecular structure having a polar group or a low polarity molecular knot. Structure. The (meth)acrylic compound may be used singly or in combination of two or more.

作為(甲基)丙烯酸類化合物的極性基團，可以列舉羥基、羧基、氨基、醯胺基等。 Examples of the polar group of the (meth)acrylic compound include a hydroxyl group, a carboxyl group, an amino group, a decylamino group and the like.

作為含有羥基的(甲基)丙烯酸類化合物，可以例舉(甲基)丙烯酸2-羥乙酯、(甲基)丙烯酸2-羥基丙酯、(甲基)丙烯酸2-羥基丁酯、(甲基)丙烯酸2-羥基-3-苯氧基丙酯、2-(甲基)丙烯醯氧基乙基-2-羥基丙基鄰苯二甲酸酯、甘油單(甲基)丙烯酸酯、(甲基)丙烯酸3-羥基丙酯、(甲基)丙烯酸3-羥基丁酯、(甲基)丙烯酸4-羥基丁酯等(甲基)丙烯酸的含有羥基的酯等。 Examples of the hydroxyl group-containing (meth)acrylic compound include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 2-hydroxybutyl (meth)acrylate. Base) 2-hydroxy-3-phenoxypropyl acrylate, 2-(meth) propylene methoxyethyl 2-hydroxypropyl phthalate, glycerol mono(meth) acrylate, ( A hydroxyl group-containing ester of (meth)acrylic acid such as 3-hydroxypropyl methacrylate, 3-hydroxybutyl (meth)acrylate or 4-hydroxybutyl (meth)acrylate.

作為含有羧基的(甲基)丙烯酸類化合物，除了例如丙烯酸、甲基丙烯酸、巴豆酸、馬來酸、衣康酸、檸康酸等乙烯性不飽和羧酸以外，還可以列舉2-(甲基)丙烯醯氧基乙基琥珀酸酯、2-(甲基)丙烯醯氧基乙基苯二甲酸酯、2-(甲基)丙烯醯氧基乙基六氫對苯二甲酸酯等。 Examples of the (meth)acrylic compound containing a carboxyl group include, in addition to the ethylenically unsaturated carboxylic acid such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, and citraconic acid, 2-(A) Acryloxyethyl succinate, 2-(meth) propylene oxirane ethyl phthalate, 2-(methyl) propylene methoxyethyl hexahydroterephthalate Wait.

作為含有氨基的(甲基)丙烯酸類化合物，可以例舉(甲基)丙烯酸單甲基氨基乙酯、(甲基)丙烯酸單乙基氨基乙酯、(甲基)丙烯酸單甲基氨基丙酯、(甲基)丙烯酸單乙基氨基丙酯等(甲基)丙烯酸單烷基氨基酯等。 The (meth)acrylic compound containing an amino group may, for example, be monomethylaminoethyl (meth)acrylate, monoethylaminoethyl (meth)acrylate or monomethylaminopropyl (meth)acrylate. And a monoalkylamino (meth)acrylate such as monoethylaminopropyl (meth)acrylate.

作為含有醯胺基的(甲基)丙烯酸類化合物，可以例舉(甲基)丙烯醯胺、N-甲基(甲基)丙烯醯胺、N-羥甲基(甲基)丙烯醯胺等丙烯醯胺類等。 Examples of the (meth)acrylic compound containing a guanamine group include (meth) acrylamide, N-methyl (meth) acrylamide, N-methylol (meth) acrylamide, and the like. Acrylamides and the like.

此外，作為低極性分子結構的(甲基)丙烯酸類化合物，可以例舉(甲基)丙烯酸脂環式酯或(甲基)丙烯酸烷基酯。 Further, as the (meth)acrylic compound having a low polar molecular structure, a (meth) acrylate cyclic ester or an alkyl (meth)acrylate may be mentioned.

作為所述的(甲基)丙烯酸脂環式酯，可以例舉(甲基)丙烯酸環己酯、(甲基)丙烯酸異冰片酯、(甲基)丙烯酸二環戊烯基氧基乙酯、(甲基)丙烯酸二環戊二烯酯、(甲基)丙烯酸三環 癸烯酯、(甲基)丙烯酸降冰片烯酯等。 The (meth) acrylate cyclic ester may, for example, be cyclohexyl (meth)acrylate, isobornyl (meth)acrylate or dicyclopentenyloxyethyl (meth)acrylate. Dicyclopentadienyl (meth)acrylate, tricyclo(meth)acrylate Terpene ester, norbornene (meth)acrylate, and the like.

作為所述(甲基)丙烯酸烷基酯，可以例舉(甲基)丙烯酸月桂酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸異癸酯、(甲基)丙烯酸苄酯、(甲基)丙烯酸十八酯、(甲基)丙烯酸丁酯、丙烯酸1,6-己二醇酯。 The alkyl (meth)acrylate may, for example, be lauryl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isodecyl (meth)acrylate or benzyl (meth)acrylate. Ester, octadecyl (meth)acrylate, butyl (meth)acrylate, 1,6-hexanediol acrylate.

作為形成第二硬塗層5的(甲基)丙烯酸類化合物的含量，沒有特別的限定，優選的是5品質%以上85品質%以下，進一步優選的是10品質%以上80品質%以下，特別優選的是15品質%以上75品質%以下。形成第二硬塗層5的(甲基)丙烯酸類化合物的含量如果超過所述上限，則在成型時產生裂紋的可能性升高。此外，形成第二硬塗層5的(甲基)丙烯酸類化合物的含量如果小於所述下限，則存在耐磨損性和塗膜硬度降低的問題。另一方面，形成第二硬塗層5的(甲基)丙烯酸類化合物的含量如果在所述範圍內，則能夠很好地保持台適的耐磨損性和塗膜硬度，而且能保持合適的柔軟性並能抑制產生裂紋。 The content of the (meth)acrylic compound forming the second hard coat layer 5 is not particularly limited, but is preferably 5% by mass or more and 85% by mass or less, and more preferably 10% by mass or more and 80% by mass or less, particularly It is preferably 15% by mass or more and 75% by mass or less. When the content of the (meth)acrylic compound forming the second hard coat layer 5 exceeds the upper limit, the possibility of occurrence of cracks during molding increases. Further, when the content of the (meth)acrylic compound forming the second hard coat layer 5 is less than the lower limit, there is a problem that abrasion resistance and coating film hardness are lowered. On the other hand, if the content of the (meth)acrylic compound forming the second hard coat layer 5 is within the above range, the abrasion resistance and the hardness of the coating film can be well maintained, and the content can be maintained properly. Softness and suppression of cracking.

作為所述的聚合引發劑，可以例舉二苯酮、苯偶醯、四甲基米氏酮、2-氯噻噸酮、2,4-二乙基噻噸酮、苯偶姻***、苯偶姻異丙醚、苯偶姻異丁醚、2,2-二乙氧基苯乙酮、安息香雙甲醚、2,2-二甲氧基-1,2-二苯基乙烷-1-酮、2-羥基-2-甲基-1-苯基丙烷-1-酮、1-羥基環己基苯基酮、2-甲基-1-[4-(甲硫基)苯基]-2-嗎啉基丙酮-1、1-[4-(2-羥基乙氧基)-苯基]-2-羥基-2-甲基-1-丙烷-1-酮、二(環戊二烯基)-二(2,6-二氟-3-(吡咯-1-基)鈦、2-苄基-2-二甲基氨基-1-(4-嗎啉苯基)-丁酮-1、2,4,6-三甲基苯甲醯基二苯基氧化膦等。另外，所述的化合物可以單獨使用，也可以將多個混合使用。 The polymerization initiator may, for example, be benzophenone, benzoin, tetramethylmethane ketone, 2-chlorothioxanthone, 2,4-diethylthioxanthone, benzoin ethyl ether or benzene. Acetone isopropyl ether, benzoin isobutyl ether, 2,2-diethoxyacetophenone, benzoin dimethyl ether, 2,2-dimethoxy-1,2-diphenylethane-1 -ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-[4-(methylthio)phenyl]- 2-morpholinylacetone-1, 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propan-1-one, bis(cyclopentadiene) Di-(2,6-difluoro-3-(pyrrol-1-yl)titanium, 2-benzyl-2-dimethylamino-1-(4-morpholinylphenyl)-butanone-1 2,4,6-trimethylbenzimidyldiphenylphosphine oxide, etc. Further, the above compounds may be used singly or in combination of a plurality of them.

第二硬塗層5的鉛筆硬度為3H以上。第二硬塗層5的鉛筆硬度更優選的是4H以上，進一步優選的是5H以上。在第二硬塗層 5的鉛筆硬度小於所述下限值的情況下，存在難以使所述光學片1形成所希望的硬度的問題。 The pencil hardness of the second hard coat layer 5 is 3H or more. The pencil hardness of the second hard coat layer 5 is more preferably 4H or more, and still more preferably 5H or more. In the second hard coat When the pencil hardness of 5 is less than the lower limit value, there is a problem that it is difficult to form the optical sheet 1 into a desired hardness.

第二硬塗層5的厚度為1μm以上10μm以下。第二硬塗層5的厚度的上限值更優選的是8μm，進一步優選的是6μm。另一方面，第二硬塗層5的厚度的下限值更優選的是2μm，進一步優選的是3μm。在第二硬塗層5的厚度超過所述上限值的情況下，不能有效地防止產生捲曲，此外也與對所述光學片1提出的薄型化的要求相背。相反，在第二硬塗層5的厚度小於所述下限值的情況下，存在難以使所述光學片1形成所希望的硬度的問題。 The thickness of the second hard coat layer 5 is 1 μm or more and 10 μm or less. The upper limit of the thickness of the second hard coat layer 5 is more preferably 8 μm, still more preferably 6 μm. On the other hand, the lower limit of the thickness of the second hard coat layer 5 is more preferably 2 μm, still more preferably 3 μm. In the case where the thickness of the second hard coat layer 5 exceeds the above upper limit value, curling cannot be effectively prevented, and the requirement for thinning of the optical sheet 1 is also reversed. On the contrary, in the case where the thickness of the second hard coat layer 5 is less than the lower limit value, there is a problem that it is difficult to form the optical sheet 1 to a desired hardness.

作為第二硬塗層5的拉伸彈性率，雖然沒有特別的限定，但是優選的是1.5GPa以上6GPa以下。此外所述硬塗層5的拉伸彈性率的上限值更優選的是5.5GPa，進一步優選的是5GPa。另一方面，第二硬塗層5的拉伸彈性率的下限值更優選的是2GPa，進一步優選的是2.5GPa。在第二硬塗層5的拉伸彈性率超過所述上限值的情況下，存在難以有效地防止產生捲曲的問題。相反，在第二硬塗層5的拉伸彈性率小於所述下限值的情況下，存在難以使所述光學片1形成所希望的硬度的問題。 The tensile modulus of elasticity of the second hard coat layer 5 is not particularly limited, but is preferably 1.5 GPa or more and 6 GPa or less. Further, the upper limit of the tensile modulus of the hard coat layer 5 is more preferably 5.5 GPa, still more preferably 5 GPa. On the other hand, the lower limit of the tensile modulus of the second hard coat layer 5 is more preferably 2 GPa, still more preferably 2.5 GPa. In the case where the tensile modulus of the second hard coat layer 5 exceeds the above upper limit value, there is a problem that it is difficult to effectively prevent the occurrence of curl. On the contrary, in the case where the tensile modulus of the second hard coat layer 5 is less than the lower limit value, there is a problem that it is difficult to form the optical sheet 1 into a desired hardness.

此外，作為第二硬塗層5的拉伸彈性率與第一硬塗層4的拉伸彈性率之比，雖然沒有特別的限定，但是優選的是1.5以上4以下。第二硬塗層5的拉伸彈性率與第一硬塗層4的拉伸彈性率之比的上限更優選的是3.5，進一步優選的是3。另一方面，第二硬塗層5的拉伸彈性率與第一硬塗層4的拉伸彈性率之比的下限更優選的是1.7，進一步優選的是2。在第二硬塗層5的拉伸彈性率與第一硬塗層4的拉伸彈性率之比超過所述上限的情況下，存在難以有效地防止產生捲曲的問題。相反，在第二硬塗層5的拉伸彈性率與第一硬塗層4的拉伸彈性率之比小於所述下限的情況下，存在不能有效地提高所述光學片1的硬度的問題。 Further, the ratio of the tensile modulus of elasticity of the second hard coat layer 5 to the tensile modulus of the first hard coat layer 4 is not particularly limited, but is preferably 1.5 or more and 4 or less. The upper limit of the ratio of the tensile modulus of the second hard coat layer 5 to the tensile modulus of the first hard coat layer 4 is more preferably 3.5, still more preferably 3. On the other hand, the lower limit of the ratio of the tensile modulus of the second hard coat layer 5 to the tensile modulus of the first hard coat layer 4 is more preferably 1.7, still more preferably 2. In the case where the ratio of the tensile modulus of elasticity of the second hard coat layer 5 to the tensile modulus of the first hard coat layer 4 exceeds the upper limit, there is a problem that it is difficult to effectively prevent curling. On the contrary, in the case where the ratio of the tensile modulus of elasticity of the second hard coat layer 5 to the tensile modulus of the first hard coat layer 4 is less than the lower limit, there is a problem that the hardness of the optical sheet 1 cannot be effectively improved. .

第二硬塗層5的製造方法沒有特別的限定，可以通過與第一 硬塗層4的製造方法相同的方法進行製造。 The manufacturing method of the second hard coat layer 5 is not particularly limited and can be passed through with the first The method of manufacturing the hard coat layer 4 is carried out in the same manner.

光學片1 Optical sheet 1

作為所述光學片1的霧度，雖然沒有特別的限定，但是優選的是2%以下，更優選的是1%以下，進一步優選的是0.5%以下。在所述光學片1的霧度超過所述上限值的情況下，存在影像的可見性下降、且所顯示的影像的清晰度下降的問題。 The haze of the optical sheet 1 is not particularly limited, but is preferably 2% or less, more preferably 1% or less, still more preferably 0.5% or less. When the haze of the optical sheet 1 exceeds the upper limit value, there is a problem that the visibility of the image is lowered and the sharpness of the displayed image is lowered.

所述光學片1的外部霧度，優選的是1.0%以下，進一步優選的是0.5%以下，所述外部霧度是空氣中的膜的霧度(Ha)與水中的膜的霧度(Hw)的差(Ha-Hw)。在所述光學片1的外部霧度超過所述上限的情況下，存在表面的凹凸會變得比較大、且相位差精度降低的問題。 The outer haze of the optical sheet 1 is preferably 1.0% or less, further preferably 0.5% or less, and the external haze is a haze (Ha) of a film in air and a haze of a film in water (Hw The difference (Ha-Hw). When the external haze of the optical sheet 1 exceeds the upper limit, there is a problem that the unevenness of the surface becomes relatively large and the phase difference accuracy is lowered.

作為所述光學片1的可見光線透射率，雖然沒有特別的限定，但是優選的是87%以上，進一步優選的是90%以上。在所述光學片1的可見光線透射率小於所述範圍的下限的情況下，存在不能使光線充分透過，從而導致可見性下降的問題。 The visible light transmittance of the optical sheet 1 is preferably 87% or more, and more preferably 90% or more, although it is not particularly limited. When the visible light transmittance of the optical sheet 1 is less than the lower limit of the range, there is a problem that light cannot be sufficiently transmitted, resulting in a decrease in visibility.

所述光學片1在相位差膜2與第二硬塗層5之間，設置有鉛筆硬度比第二硬塗層5的鉛筆硬度小的第一硬塗層4。因此，所述光學片1能夠防止因相位差膜2與第二硬塗層5的硬度差引起的捲曲，並且通過第一硬塗層4和第二硬塗層5，能夠有效地提高相位差膜2的一個面側的硬度。特別是通過使所述光學片1的第二硬塗層5的厚度在所述範圍內，並且相對於第二硬塗層5的厚度將第一硬塗層4的厚度保持在所述範圍，由此通過第一硬塗層4能夠很好地抑制因第二硬塗層5的鉛筆硬度較高而引起的捲曲。此外，所述光學片1的第一硬塗層4較厚。因此，所述光學片1通過第一硬塗層4，能夠有效地實現用於防止產生捲曲的緩衝功能，並且能夠有效地提高所述光學片1的一個面側的硬度。其結果，即使所述光學片1的第二硬塗層5形成的較薄，也能夠通過與形成的較厚的第一硬塗層4相輔相成，從而獲得所希望的硬度。 所述光學片1能夠防止產生捲曲的結果，能夠有效地防止因產生捲曲而引起相位差膜2的相位差產生變化。 The optical sheet 1 is provided between the retardation film 2 and the second hard coat layer 5 with a first hard coat layer 4 having a pencil hardness smaller than that of the second hard coat layer 5. Therefore, the optical sheet 1 can prevent curl caused by the difference in hardness between the retardation film 2 and the second hard coat layer 5, and can effectively increase the phase difference by the first hard coat layer 4 and the second hard coat layer 5. The hardness of one side of the film 2. In particular, by making the thickness of the second hard coat layer 5 of the optical sheet 1 within the range, and maintaining the thickness of the first hard coat layer 4 in the range with respect to the thickness of the second hard coat layer 5, Thereby, the curl due to the higher pencil hardness of the second hard coat layer 5 can be well suppressed by the first hard coat layer 4. Further, the first hard coat layer 4 of the optical sheet 1 is thick. Therefore, the optical sheet 1 passes through the first hard coat layer 4, and the cushioning function for preventing curling can be effectively realized, and the hardness of one surface side of the optical sheet 1 can be effectively improved. As a result, even if the second hard coat layer 5 of the optical sheet 1 is formed thin, it can be complementarily formed with the thick first hard coat layer 4 formed, thereby obtaining a desired hardness. The optical sheet 1 can prevent the occurrence of curling, and can effectively prevent the phase difference of the retardation film 2 from being changed due to the occurrence of curl.

所述光學片1即使在使用聚碳酸酯類樹脂或環烯烴類樹脂這樣的硬度比較低、且容易產生捲曲的樹脂作為相位差膜2的主要成分的情況下，也能防止產生捲曲，並能有效地提高所述相位差膜2的一個面側的硬度。通過使用聚碳酸酯類樹脂作為相位差膜2的主要成分，所述光學片1能提高耐衝擊性。通過使用環烯烴類樹脂作為相位差膜2的主要成分，所述光學片1能有效地抑制因直射陽光和顯示器發熱等外力而產生的相位差的變化。此外，通過使用丙烯酸類樹脂作為相位差膜2的主要成分，所述光學片1能具有優異的光學透明性，能夠使光線非常好地透過。 In the optical sheet 1 , when a resin having a relatively low hardness and a curling property such as a polycarbonate resin or a cycloolefin resin is used as a main component of the retardation film 2, curling can be prevented and The hardness of one surface side of the retardation film 2 is effectively increased. By using a polycarbonate resin as a main component of the retardation film 2, the optical sheet 1 can improve impact resistance. By using a cycloolefin-based resin as a main component of the retardation film 2, the optical sheet 1 can effectively suppress a change in phase difference due to an external force such as direct sunlight and display heat. Further, by using an acrylic resin as a main component of the retardation film 2, the optical sheet 1 can have excellent optical transparency and can transmit light very well.

由於相位差膜2是1/4波長膜，所以所述光學片1適合用於觸摸面板等。 Since the retardation film 2 is a 1/4 wavelength film, the optical sheet 1 is suitable for use in a touch panel or the like.

第二實施方式 Second embodiment 光學片11 Optical sheet 11

圖2的光學片11包括相位差膜2、硬塗層3和高折射率層12。本實施方式中的相位差膜2和硬塗層3由於與圖1的光學片1的相位差膜2和硬塗層3相同，因此對它們賦予了相同的附圖標記，並省略了對它們的說明。 The optical sheet 11 of FIG. 2 includes a retardation film 2, a hard coat layer 3, and a high refractive index layer 12. Since the retardation film 2 and the hard coat layer 3 in the present embodiment are the same as the retardation film 2 and the hard coat layer 3 of the optical sheet 1 of Fig. 1, they are given the same reference numerals, and their instruction of.

高折射率層12 High refractive index layer 12

高折射率層12形成於相位差膜2的另一個面。作為高折射率層12的主要成分，沒有特別的限定，可以列舉熱固性樹脂、熱塑性樹脂、活性能量線固化樹脂等。作為熱固性樹脂，可以列舉酚醛樹脂、三聚氰氨樹脂、聚氨酯樹脂、尿素樹脂、鄰苯二甲酸二烯丙酯樹脂、胍胺樹脂、不飽和聚酯樹脂、氨基醇酸樹脂、三聚氰氨-尿素共縮合樹脂、矽樹脂、聚矽氧烷樹脂等。另外，在所述的樹脂中，根據需要，可以添加交聯劑、聚合引發劑、聚合促進劑、溶劑、黏度調整劑等。 The high refractive index layer 12 is formed on the other surface of the retardation film 2. The main component of the high refractive index layer 12 is not particularly limited, and examples thereof include a thermosetting resin, a thermoplastic resin, and an active energy ray-curable resin. Examples of the thermosetting resin include phenol resin, melamine resin, urethane resin, urea resin, diallyl phthalate resin, guanamine resin, unsaturated polyester resin, amino alkyd resin, and melamine. - a urea co-condensation resin, an anthracene resin, a polyoxyalkylene resin, or the like. Further, a crosslinking agent, a polymerization initiator, a polymerization accelerator, a solvent, a viscosity adjuster, or the like may be added to the resin as needed.

此外，也可以通過塗佈塗料組合物來形成高折射率層12，所述塗料組合物是通過在黏合劑樹脂中添加了具有高折射率的超微顆粒而得到的。作為所述超微顆粒，可以例舉ZnO、TiO2、CeO2、SnO2、ITO、Cs0.33WO3、Al2O3、La2O3、ZrO2、Y2O3等無機材料。另一方面，作為所述黏合劑樹脂，可以例舉與形成第二硬塗層5的樹脂相同的物質。可以將所述的無機材料超微顆粒化後，將超微顆粒分散在黏合劑樹脂中，用溶劑稀釋後，通過輥塗法、旋轉塗佈法、浸塗法、噴塗法、棒塗法、刮塗法、模具塗佈法、噴墨式塗佈法、凹版印刷塗佈法等習知的塗佈方法形成所述高折射率層12。 Further, it is also possible to form the high refractive index layer 12 by applying a coating composition obtained by adding ultrafine particles having a high refractive index to the binder resin. Examples of the ultrafine particles include inorganic materials such as ZnO, TiO 2 , CeO 2 , SnO 2 , ITO, Cs 0.33 WO 3 , Al 2 O 3 , La 2 O 3 , ZrO 2 , and Y 2 O 3 . On the other hand, as the binder resin, the same one as the resin forming the second hard coat layer 5 can be exemplified. After the inorganic material is ultrafinely granulated, the ultrafine particles are dispersed in a binder resin, diluted with a solvent, and then subjected to a roll coating method, a spin coating method, a dip coating method, a spray coating method, a bar coating method, The high refractive index layer 12 is formed by a conventional coating method such as a doctor blade method, a die coating method, an inkjet coating method, or a gravure coating method.

作為所述超微顆粒的平均粒徑，雖然沒有特別的限定，但是優選的是1nm以上100nm以下。所述超微顆粒的平均粒徑的上限值更優選的是80nm，進一步優選的是60nm。另一方面，所述超微顆粒的平均粒徑的下限值更優選的是5nm，進一步優選的是10nm。在所述超微顆粒的平均粒徑超過所述上限值的情況下，存在高折射率層12的透明性降低的問題。相反，在所述超微顆粒的平均粒徑小於所述下限值的情況下，存在超微顆粒的分散性降低的問題。 The average particle diameter of the ultrafine particles is not particularly limited, but is preferably 1 nm or more and 100 nm or less. The upper limit of the average particle diameter of the ultrafine particles is more preferably 80 nm, still more preferably 60 nm. On the other hand, the lower limit of the average particle diameter of the ultrafine particles is more preferably 5 nm, still more preferably 10 nm. When the average particle diameter of the ultrafine particles exceeds the upper limit value, there is a problem that the transparency of the high refractive index layer 12 is lowered. On the contrary, in the case where the average particle diameter of the ultrafine particles is less than the lower limit value, there is a problem that the dispersibility of the ultrafine particles is lowered.

作為所述超微顆粒相對於黏合劑的含量，雖然沒有特別的限定，但是例如可以是10品質%以上60品質%以下。 The content of the ultrafine particles with respect to the binder is not particularly limited, but may be, for example, 10% by mass or more and 60% by mass or less.

作為高折射率層12的折射率，雖然沒有特別的限定，但是優選的是1.6以上2.3以下。高折射率層12的折射率的上限值更優選的是2.25，進一步優選的是2.2。另一方面，高折射率層12的折射率的下限值更優選的是1.7，進一步優選的是1.75。在高折射率層12的折射率不在所述範圍內的情況下，在將所述光學片11的高折射率層12與觸摸面板等的透明導電層層疊時，高折射率層12的折射率與透明導電層的折射率的差異變大，存在形成於透明導電層的電極圖案的可見性會增大的問題。 The refractive index of the high refractive index layer 12 is not particularly limited, but is preferably 1.6 or more and 2.3 or less. The upper limit of the refractive index of the high refractive index layer 12 is more preferably 2.25, further preferably 2.2. On the other hand, the lower limit of the refractive index of the high refractive index layer 12 is more preferably 1.7, still more preferably 1.75. In the case where the refractive index of the high refractive index layer 12 is not in the above range, when the high refractive index layer 12 of the optical sheet 11 is laminated with a transparent conductive layer such as a touch panel, the refractive index of the high refractive index layer 12 is The difference in refractive index from the transparent conductive layer becomes large, and there is a problem in that the visibility of the electrode pattern formed on the transparent conductive layer increases.

作為高折射率層12的鉛筆硬度，雖然沒有特別的限定，但是優選的是F以上2H以下。高折射率層12的鉛筆硬度的上限值更優選的是H。另一方面，高折射率層12的鉛筆硬度的下限值更優選的是HB。此外，作為高折射率層12的厚度，雖然沒有特別的限定，但是優選的是50nm以上10μm以下。高折射率層12的厚度的上限值更優選的是7μm，進一步優選的是5μm。另一方面，高折射率層12的厚度的下限值更優選的是100nm，進一步優選的是200nm。在高折射率層12的鉛筆硬度和厚度分別超出各自的所述上限值的情況下，產生捲曲的可能性變高，並且也與對所述光學片11提出的薄型化的要求相背。相反，在高折射率層12的鉛筆硬度和厚度分別小於各自的所述下限值的情況下，存在不能很好地提高相位差膜2另一個面側的硬度的問題。與此相對，在高折射率層12的鉛筆硬度和厚度分別在各自的所述範圍內的情況下，能夠很好地提高相位差膜2另一個面側的硬度並能防止產生捲曲，並且能促進所述光學片11的薄型化。 The pencil hardness of the high refractive index layer 12 is not particularly limited, but is preferably F or more and 2H or less. The upper limit of the pencil hardness of the high refractive index layer 12 is more preferably H. On the other hand, the lower limit of the pencil hardness of the high refractive index layer 12 is more preferably HB. Further, the thickness of the high refractive index layer 12 is preferably 50 nm or more and 10 μm or less, although it is not particularly limited. The upper limit of the thickness of the high refractive index layer 12 is more preferably 7 μm, still more preferably 5 μm. On the other hand, the lower limit of the thickness of the high refractive index layer 12 is more preferably 100 nm, still more preferably 200 nm. In the case where the pencil hardness and the thickness of the high refractive index layer 12 exceed the respective upper limit values, respectively, the possibility of occurrence of curling becomes high, and also contrary to the demand for thinning of the optical sheet 11 proposed. On the other hand, in the case where the pencil hardness and the thickness of the high refractive index layer 12 are each smaller than the respective lower limit values, there is a problem that the hardness of the other surface side of the retardation film 2 cannot be improved satisfactorily. On the other hand, in the case where the pencil hardness and the thickness of the high refractive index layer 12 are respectively within the respective ranges, the hardness of the other surface side of the retardation film 2 can be well improved and curling can be prevented, and The thinning of the optical sheet 11 is promoted.

所述光學片11由於包括形成於相位差膜2的另一個面側的高折射率層12，因此能夠提高相位差膜2的另一個面側的折射率。另外，所述光學片11的霧度、外部霧度和可見光線透射率與光學片1的相同。 Since the optical sheet 11 includes the high refractive index layer 12 formed on the other surface side of the retardation film 2, the refractive index of the other surface side of the retardation film 2 can be improved. Further, the haze, the external haze, and the visible light transmittance of the optical sheet 11 are the same as those of the optical sheet 1.

第三實施方式 Third embodiment 透明導電性層疊體21 Transparent conductive laminate 21

圖3的透明導電性層疊體21包括光學片11和透明導電層22。本實施方式中的光學片11由於與圖2的光學片11相同，因此對其賦予了相同的附圖標記，並省略了對其的說明。 The transparent electroconductive laminate 21 of FIG. 3 includes an optical sheet 11 and a transparent conductive layer 22. The optical sheet 11 in the present embodiment is the same as the optical sheet 11 in Fig. 2, and therefore the same reference numerals are given thereto, and the description thereof is omitted.

透明導電層22 Transparent conductive layer 22

透明導電層22層疊于高折射率層12的另一個面。作為透明導電層22的形成材料，只要是具有透明性和導電性的導電性材料，就沒有特別的限定，可以列舉無機類金屬和有機導電高分子。 作為無機類金屬，可以例舉金、銀、銅、鉑、鎳、氧化錫、氧化銦錫(ITO)等。作為有機導電高分子，可以例舉使用了聚苯胺、聚噻吩、聚吡咯、聚喹喔啉等的有機導電性組合物。其中，優選的是光學特性、外觀和導電性良好的ITO或聚噻吩類材料。 The transparent conductive layer 22 is laminated on the other surface of the high refractive index layer 12. The material for forming the transparent conductive layer 22 is not particularly limited as long as it is a conductive material having transparency and conductivity, and examples thereof include an inorganic metal and an organic conductive polymer. The inorganic metal may, for example, be gold, silver, copper, platinum, nickel, tin oxide or indium tin oxide (ITO). The organic conductive polymer may, for example, be an organic conductive composition such as polyaniline, polythiophene, polypyrrole or polyquinoxaline. Among them, preferred are ITO or polythiophene-based materials having excellent optical properties, appearance, and conductivity.

作為在高折射率層12上塗佈透明導電層22的形成材料的方法，沒有特別的限定，可以通過例如輥塗法、旋轉塗佈法、浸塗法、噴塗法、棒塗法、刮塗法、模具塗佈法、噴墨式塗佈法、凹版印刷塗佈法等習知的塗佈方法。此外，在塗佈透明導電層22的形成材料時，為了提高與高折射率層12的貼緊性，也可以預先對高折射率層12進行電暈放電處理等前處理。 The method of forming the material for forming the transparent conductive layer 22 on the high refractive index layer 12 is not particularly limited, and may be, for example, a roll coating method, a spin coating method, a dip coating method, a spray coating method, a bar coating method, or a blade coating method. Conventional coating methods such as a method, a die coating method, an inkjet coating method, and a gravure coating method. Further, when the material for forming the transparent conductive layer 22 is applied, in order to improve the adhesion to the high refractive index layer 12, the high refractive index layer 12 may be subjected to pretreatment such as corona discharge treatment in advance.

作為透明導電層22的形成材料的固化方法，可以通過例如高壓水銀燈、鹵素燈、氙燈、氮氣鐳射、電子束加速裝置、放射性元素等活性能量線源等來進行固化。此外，作為活性能量線的照射量，以紫外線的波長365nm下的累計光量計，優選的是50mJ/cm2以上5000 mJ/cm2以下。在照射量超過所述上限值的情況下，存在會導致活性能量線固化型樹脂著色的問題。相反，在照射量小於所述下限值的情況下，存在固化不足的問題。 The curing method of the material for forming the transparent conductive layer 22 can be performed by, for example, a high-pressure mercury lamp, a halogen lamp, a xenon lamp, a nitrogen laser, an electron beam accelerator, an active energy ray source such as a radioactive element, or the like. Further, the irradiation amount of the active energy ray is preferably 50 mJ/cm 2 or more and 5000 mJ/cm 2 or less based on the cumulative light amount at a wavelength of 365 nm of ultraviolet light. When the irradiation amount exceeds the above upper limit value, there is a problem that the active energy ray-curable resin is colored. On the contrary, when the irradiation amount is less than the lower limit value, there is a problem that the curing is insufficient.

此外，也可以通過濺射法等幹法來形成透明導電層22。作為透明導電層22的形成方法，從與高折射率層12的貼緊性和薄型化的觀點出發，優選的是通過濺射法形成透明導電層22的方法。 Further, the transparent conductive layer 22 may be formed by a dry method such as a sputtering method. As a method of forming the transparent conductive layer 22, from the viewpoint of adhesion to the high refractive index layer 12 and thickness reduction, a method of forming the transparent conductive layer 22 by a sputtering method is preferable.

作為通過所述濺射法形成時的透明導電層22的厚度，雖然沒有特別的限定，但是優選的是50Å以上2000Å以下。通過所述濺射法形成時的透明導電層22的厚度的上限值更優選的是1000Å，進一步優選的是500Å。另一方面，通過所述濺法形成時的透明導電層22的厚度的下限值更優選的是70 Å，進一步優選的是90 Å。在透明導電層22的厚度在所述範圍內的情況下，能夠很好地保持導電性和透明性這雙方的性能。此外，即使在光學片11的厚度較厚的情況下，通過濺射法形成透明導電層22並使透明導電層22 的厚度在所述範圍內，也能夠促進所述透明導電性層疊體21的薄型化。 The thickness of the transparent conductive layer 22 when formed by the sputtering method is not particularly limited, but is preferably 50 Å or more and 2000 Å or less. The upper limit of the thickness of the transparent conductive layer 22 when formed by the sputtering method is more preferably 1000 Å, further preferably 500 Å. On the other hand, the lower limit of the thickness of the transparent conductive layer 22 when formed by the sputtering method is more preferably 70 Å, further preferably 90 Å. When the thickness of the transparent conductive layer 22 is within the above range, the performances of both conductivity and transparency can be well maintained. Further, even in the case where the thickness of the optical sheet 11 is thick, the transparent conductive layer 22 is formed by a sputtering method and the transparent conductive layer 22 is formed. When the thickness is within the above range, the thickness of the transparent electroconductive laminate 21 can be promoted.

所述透明導電性層疊體21由於包括光學片11，因此能很好地防止光學片11產生捲曲，從而能夠有效地防止因產生捲曲而引起的相位差膜2的相位差的變化。此外，所述透明導電性層疊體21由於包括光學片11，因此能夠有效地提高相位差膜2的一個面側的硬度。此外，通過使高折射率層12的折射率與透明導電層22的折射率接近，在所述透明導電性層疊體21例如用於觸摸面板的情況下，可以降低形成於透明導電層22的電極圖案的可見性。 Since the transparent electroconductive laminate 21 includes the optical sheet 11, the optical sheet 11 can be prevented from being curled, and the change in the phase difference of the retardation film 2 due to the occurrence of curl can be effectively prevented. Further, since the transparent electroconductive laminate 21 includes the optical sheet 11, the hardness of one surface side of the retardation film 2 can be effectively improved. Further, by making the refractive index of the high refractive index layer 12 close to the refractive index of the transparent conductive layer 22, in the case where the transparent conductive laminated body 21 is used for, for example, a touch panel, the electrode formed on the transparent conductive layer 22 can be lowered. The visibility of the pattern.

作為高折射率層12的折射率與透明導電層22的折射率的差，雖然沒有特別的限定，但是優選的是0.6以下，更優選的是0.5以下，進一步優選的是0.3以下。通過使高折射率層12的折射率與透明導電層22的折射率的差在所述範圍內，從而所述透明導電性層疊體21能進一步降低形成於透明導電層22的電極圖案的可見性。 The difference between the refractive index of the high refractive index layer 12 and the refractive index of the transparent conductive layer 22 is not particularly limited, but is preferably 0.6 or less, more preferably 0.5 or less, still more preferably 0.3 or less. The transparent conductive laminate 21 can further reduce the visibility of the electrode pattern formed on the transparent conductive layer 22 by making the difference between the refractive index of the high refractive index layer 12 and the refractive index of the transparent conductive layer 22 within the range. .

第四實施方式 Fourth embodiment 觸摸面板31 Touch panel 31

圖4的觸摸面板31是電容方式的觸摸面板。觸摸面板31配置於液晶面板(圖中沒有表示)的表面側(觀看的人一側)。觸摸面板31包括透明導電性層疊體21、玻璃基板32以及黏合層33。本實施方式中的透明導電性層疊體21與圖3的透明導電性層疊體21相同，所以對其賦予了相同的附圖標記，並省略了對其的說明。此外，所述液晶面板包括液晶層和一對偏光板，該一對偏光板配置在所述液晶層的表面側和背面側。 The touch panel 31 of FIG. 4 is a capacitive touch panel. The touch panel 31 is disposed on the surface side (the side on which the person is viewed) on the liquid crystal panel (not shown). The touch panel 31 includes a transparent conductive laminate 21, a glass substrate 32, and an adhesive layer 33. The transparent electroconductive laminate 21 of the present embodiment is the same as the transparent electroconductive laminate 21 of FIG. 3, and therefore the same reference numerals are given thereto, and the description thereof is omitted. Further, the liquid crystal panel includes a liquid crystal layer and a pair of polarizing plates which are disposed on the front side and the back side of the liquid crystal layer.

透明導電性層疊體21配置成：光學片11位於觸摸面板31的表面側，透明導電層22位於觸摸面板31的液晶面板側。透明導電性層疊體21配置成：相位差膜2的快軸方向與配置在液晶層表面側的偏光板的偏振光軸成45°角。透明導電性層疊體21通過黏 合層33層疊在玻璃基板32上。作為黏合層33，沒有特別的限定，可以例舉使用了丙烯酸類樹脂、聚氨酯類樹脂等習知的黏合性樹脂的黏合層。 The transparent conductive laminate 21 is disposed such that the optical sheet 11 is located on the surface side of the touch panel 31, and the transparent conductive layer 22 is located on the liquid crystal panel side of the touch panel 31. The transparent conductive laminate 21 is disposed such that the fast axis direction of the retardation film 2 is at an angle of 45° with respect to the polarization axis of the polarizing plate disposed on the surface side of the liquid crystal layer. Transparent conductive laminate 21 is adhered The bonding layer 33 is laminated on the glass substrate 32. The adhesive layer 33 is not particularly limited, and an adhesive layer of a conventional adhesive resin such as an acrylic resin or a urethane resin may be used.

對觸摸面板31的圖像光線透射功能進行說明。從配置在液晶層表面側的偏光板射出的偏振光在透射過相位差膜2之後，轉換成圓偏振光(此外，在相位差膜2是1/2波長膜的情況下，使偏振光旋轉90°)。由此，在通過太陽鏡(偏光太陽鏡)看液晶螢幕的情況下，能避免正交尼科耳()狀態，從而能夠看到圖像。 The image light transmission function of the touch panel 31 will be described. The polarized light emitted from the polarizing plate disposed on the surface side of the liquid crystal layer is converted into circularly polarized light after being transmitted through the retardation film 2 (in addition, in the case where the retardation film 2 is a 1/2 wavelength film, the polarized light is rotated 90°). Thus, in the case of looking at the liquid crystal screen through sunglasses (polarized sunglasses), it is possible to avoid crossed Nicols ( ) state so that the image can be seen.

所述觸摸面板31由於包括所述光學片11，所以能很好地防止所述光學片11產生捲曲，從而能有效地防止因產生捲曲引起的相位差膜2的相位差的變化。此外，所述觸摸面板31由於包括所述光學片11，所以能有效地提高相位差膜2的一個面側的硬度。此外，通過使高折射率層12的折射率與透明導電層22的折射率接近，所述觸摸面板31能降低形成於透明導電層22的電極圖案的可見性。 Since the touch panel 31 includes the optical sheet 11, the optical sheet 11 can be prevented from being curled, and the change in the phase difference of the retardation film 2 due to the occurrence of curl can be effectively prevented. Further, since the touch panel 31 includes the optical sheet 11, the hardness of one surface side of the retardation film 2 can be effectively improved. Further, by making the refractive index of the high refractive index layer 12 close to the refractive index of the transparent conductive layer 22, the touch panel 31 can reduce the visibility of the electrode pattern formed on the transparent conductive layer 22.

第五實施方式 Fifth embodiment 觸摸面板41 Touch panel 41

圖5的觸摸面板41是電阻膜方式的觸摸面板。觸摸面板41配置在液晶面板(圖中沒有表示)的表面側。觸摸面板41包括透明導電性層疊體21、多個點狀間隔物42、柱狀間隔物43、透明導電膜44、高折射率層45和玻璃基板46。本實施方式的透明導電性層疊體21與圖3的透明導電性層疊體21相同，所以對本實施方式的透明導電性層疊體21賦予了相同的附圖標記，並省略了對其的說明。此外，所述液晶面板包括液晶層和一對偏光板，該一對偏光板配置在所述液晶層的表面側和背面側。 The touch panel 41 of FIG. 5 is a resistive film type touch panel. The touch panel 41 is disposed on the surface side of the liquid crystal panel (not shown). The touch panel 41 includes a transparent conductive laminate 21, a plurality of dot spacers 42, a columnar spacer 43, a transparent conductive film 44, a high refractive index layer 45, and a glass substrate 46. Since the transparent electroconductive laminate 21 of the present embodiment is the same as the transparent electroconductive laminate 21 of FIG. 3, the transparent electroconductive laminate 21 of the present embodiment is denoted by the same reference numeral, and the description thereof is omitted. Further, the liquid crystal panel includes a liquid crystal layer and a pair of polarizing plates which are disposed on the front side and the back side of the liquid crystal layer.

在透明導電膜44表面形成有多個點狀間隔物42。作為點狀間隔物42的形成材料，可以例舉環氧樹脂和矽樹脂等絕緣樹脂。柱 狀間隔物43配置在透明導電層22和透明導電膜44之間。作為柱狀間隔物43的形成材料，可以例舉的有環氧樹脂、聚酯、丙烯酸樹脂等絕緣樹脂。柱狀間隔物43固定在透明導電層22背面側的邊緣部，並且固定在透明導電膜44的表面側的邊緣部。柱狀間隔物43配置成使透明導電層22和透明導電膜44分開。透明導電膜44形成于高折射率層45的表面側。作為透明導電膜44的形成材料，沒有特別的限定，可以例舉的有與透明導電層22的形成材料相同的形成材料。可以通過與透明導電層22相同的方法在高折射率層45的表面塗佈形成材料，由此形成透明導電膜44。高折射率層45層疊於玻璃基板46的表面。作為高折射率層45的形成材料，沒有特別的限定，可以例舉的有與高折射率層12的形成材料相同的形成材料。作為高折射率層45的層疊方法，沒有特別的限定，例如可以通過黏合層(圖中沒有表示)層疊於玻璃基板的表面。作為所述的黏合層沒有特別的限定，可以例舉的有與所述的黏合層相同的黏合層。 A plurality of dot spacers 42 are formed on the surface of the transparent conductive film 44. The material for forming the dot spacer 42 may, for example, be an insulating resin such as an epoxy resin or a bismuth resin. column The spacer 43 is disposed between the transparent conductive layer 22 and the transparent conductive film 44. The material for forming the columnar spacer 43 may, for example, be an insulating resin such as an epoxy resin, a polyester or an acrylic resin. The columnar spacer 43 is fixed to the edge portion on the back side of the transparent conductive layer 22, and is fixed to the edge portion on the surface side of the transparent conductive film 44. The column spacer 43 is configured to separate the transparent conductive layer 22 and the transparent conductive film 44. The transparent conductive film 44 is formed on the surface side of the high refractive index layer 45. The material for forming the transparent conductive film 44 is not particularly limited, and may be the same material as the material for forming the transparent conductive layer 22. The forming material can be applied to the surface of the high refractive index layer 45 by the same method as the transparent conductive layer 22, whereby the transparent conductive film 44 is formed. The high refractive index layer 45 is laminated on the surface of the glass substrate 46. The material for forming the high refractive index layer 45 is not particularly limited, and may be the same material as the material for forming the high refractive index layer 12. The lamination method of the high refractive index layer 45 is not particularly limited, and for example, it may be laminated on the surface of the glass substrate by an adhesive layer (not shown). The adhesive layer is not particularly limited, and may be the same adhesive layer as the above-mentioned adhesive layer.

對觸摸面板41的圖像光線透射功能進行說明。從配置在液晶層的表面側的偏光板射出的偏振光在透射過相位差膜2之後，轉換成圓偏振光。由此，在通過太陽鏡(偏光太陽鏡)觀看液晶螢幕的情況下，能避免正交尼科耳()狀態，從而能看到圖像。 The image light transmission function of the touch panel 41 will be described. The polarized light emitted from the polarizing plate disposed on the surface side of the liquid crystal layer is converted into circularly polarized light after being transmitted through the retardation film 2. Thus, in the case of viewing the liquid crystal screen through sunglasses (polarized sunglasses), it is possible to avoid crossed Nicols ( ) state so that you can see the image.

所述觸摸面板41由於包括所述光學片11，所以能很好地防止所述光學片11產生捲曲，從而能有效地防止因產生捲曲而引起的相位差膜2的相位差的變化。此外，所述觸摸面板41由於包括所述光學片11，所以能有效地提高相位差膜2的一個面側的硬度。此外，通過使高折射率層12的折射率與透明導電層22的折射率接近，所述觸摸面板41能降低形成於透明導電層22的電極圖案的可見性。 Since the touch panel 41 includes the optical sheet 11, the optical sheet 11 can be prevented from being curled, and the change in the phase difference of the retardation film 2 due to the occurrence of curl can be effectively prevented. Further, since the touch panel 41 includes the optical sheet 11, the hardness of one surface side of the retardation film 2 can be effectively improved. Further, by making the refractive index of the high refractive index layer 12 close to the refractive index of the transparent conductive layer 22, the touch panel 41 can reduce the visibility of the electrode pattern formed on the transparent conductive layer 22.

其他實施方式 Other embodiments

此外，本發明的光學片、包括該光學片的透明導電性層疊體、以及包括該透明導電性層疊體的觸摸面板，除了所述的方式以外，可以進行各種變形和改進。例如所述光學片也可以在另一個面側形成有黏合層。作為該黏合層可以例舉的有使用了丙烯酸類樹脂、聚氨酯類樹脂等習知的黏合性樹脂的黏合層。可以通過把黏合劑溶液塗佈到相位差膜或高折射率層的另一個面側，然後使黏合劑溶液乾燥，由此形成黏合層。此外，也可以把黏合劑溶液預先塗佈在離型紙的單面上後使黏合劑溶液乾燥，然後把附有黏合劑的離型紙與相位差膜或高折射率層貼合，由此形成黏合層。 Further, the optical sheet of the present invention, the transparent electroconductive laminate including the optical sheet, and the touch panel including the transparent electroconductive laminate can be variously modified and improved in addition to the above-described modes. For example, the optical sheet may have an adhesive layer formed on the other surface side. An adhesive layer using a conventional adhesive resin such as an acrylic resin or a urethane resin can be exemplified as the adhesive layer. The adhesive layer can be formed by applying a binder solution to the other side of the retardation film or the high refractive index layer, and then drying the binder solution. In addition, the adhesive solution may be pre-coated on one side of the release paper to dry the adhesive solution, and then the release paper with the adhesive is attached to the retardation film or the high refractive index layer to form a bond. Floor.

此外，所述光學片也可以在第二硬塗層中分散含有ZnO、TiO2、CeO2、SnO2、ITO、Cs0.33WO3、Al2O3、La2O3、ZrO2、Y2O3等超微顆粒，由此提高折射率。按照該結構，所述光學片能夠使第二硬塗層的折射率與透明導電層的折射率接近。因此，通過在第二硬塗層上設置透明導電層，所述光學片能夠降低形成於透明導電層的電極圖案的可見性。 In addition, the optical sheet may be dispersed in the second hard coating layer containing ZnO, TiO 2, CeO 2, SnO 2, ITO, Cs 0.33 WO 3, Al2O 3, La 2 O 3, ZrO 2, Y 2 O 3 Such as ultrafine particles, thereby increasing the refractive index. According to this configuration, the optical sheet can bring the refractive index of the second hard coat layer close to the refractive index of the transparent conductive layer. Therefore, by providing a transparent conductive layer on the second hard coat layer, the optical sheet can reduce the visibility of the electrode pattern formed on the transparent conductive layer.

所述光學片的相位差膜無需一定是1/4波長膜，也可以是1/2波長膜、3/4波長膜等。1/4波長膜、3/4波長膜利用圓偏振光特性，1/2波長膜利用使偏振光旋轉90°的性能。在戴上偏光太陽鏡而成為正交尼科耳()狀態的情況下，用1/2波長膜使偏光旋轉90°而成為平行尼科耳(平行)狀態。所述光學片也可以在第二硬塗層上層疊其他層(例如UV吸收層、抗靜電層和反射防止層等)。所述光學片也可以在相位差膜和第一硬塗層之間、第一硬塗層和第二硬塗層之間、相位差膜和高折射率層之間包括中間層。所述光學片也可以在相位差膜的另一個面側依次形成第一硬塗層和第二硬塗層。所述光學片可以用於電容方式、電阻膜方式、電磁感應方式等各種觸摸面板。所述光學片還可以用於立體影像顯示裝置和其他的各種液晶顯示模組。 The retardation film of the optical sheet need not necessarily be a 1/4 wavelength film, and may be a 1/2 wavelength film, a 3/4 wavelength film, or the like. The 1/4 wavelength film and the 3/4 wavelength film utilize circularly polarized light characteristics, and the 1/2 wavelength film utilizes a property of rotating polarized light by 90°. Wear polarized sunglasses and become crossed Nicols ( In the case of a state, the polarized light is rotated by 90° with a 1/2 wavelength film to become parallel Nicols (parallel) )status. The optical sheet may also be laminated with other layers (for example, a UV absorbing layer, an antistatic layer, an antireflection layer, etc.) on the second hard coat layer. The optical sheet may also include an intermediate layer between the retardation film and the first hard coat layer, between the first hard coat layer and the second hard coat layer, and between the retardation film and the high refractive index layer. The optical sheet may also form a first hard coat layer and a second hard coat layer in this order on the other side of the retardation film. The optical sheet can be used for various touch panels such as a capacitive method, a resistive film method, and an electromagnetic induction method. The optical sheet can also be used for a stereoscopic image display device and other various liquid crystal display modules.

工業實用性 Industrial applicability

如上所述，本發明的光學片、包括該光學片的透明導電性層疊體、以及包括該透明導電性層疊體的觸摸面板能夠提高所述光學片的硬度，並且能夠有效地防止產生捲曲，從而能夠防止相位差的變化，能夠很好地用於觸摸面板以及其他的各種液晶顯示模組。 As described above, the optical sheet of the present invention, the transparent electroconductive laminate including the optical sheet, and the touch panel including the transparent electroconductive laminate can improve the hardness of the optical sheet and can effectively prevent curling. It can prevent changes in phase difference and can be used well for touch panels and other various liquid crystal display modules.

1‧‧‧光學片 1‧‧‧ optical film

2‧‧‧相位差膜 2‧‧‧ phase difference film

3‧‧‧硬塗層 3‧‧‧hard coating

4‧‧‧第一硬塗層 4‧‧‧First hard coating

5‧‧‧第二硬塗層 5‧‧‧Second hard coating

Claims (13)

一種光學片，所述光學片包括：相位差膜，作為主要成分含有透明性高分子；第一硬塗層，形成於所述相位差膜的一個面側；以及第二硬塗層，形成於所述第一硬塗層的一個面側，所述第二硬塗層的鉛筆硬度為3H以上，所述第一硬塗層的鉛筆硬度比所述第二硬塗層的鉛筆硬度小，所述第二硬塗層的厚度為1μm以上10μm以下，所述第一硬塗層的厚度是所述第二硬塗層的厚度的4倍以上20倍以下。 An optical sheet comprising: a retardation film containing a transparent polymer as a main component; a first hard coat layer formed on one surface side of the retardation film; and a second hard coat layer formed on a pencil side hardness of the second hard coat layer is 3H or more, and a pencil hardness of the first hard coat layer is smaller than a pencil hardness of the second hard coat layer. The thickness of the second hard coat layer is 1 μm or more and 10 μm or less, and the thickness of the first hard coat layer is 4 times or more and 20 times or less the thickness of the second hard coat layer. 如申請專利範圍第1項所述的光學片，其中，所述第一硬塗層的鉛筆硬度為F以上2H以下。 The optical sheet according to claim 1, wherein the pencil hardness of the first hard coat layer is F or more and 2H or less. 如申請專利範圍第1項所述的光學片，其中，所述第一硬塗層的厚度為20μm以上100μm以下。 The optical sheet according to claim 1, wherein the first hard coat layer has a thickness of 20 μm or more and 100 μm or less. 如申請專利範圍第1項所述的光學片，其中，所述透明性高分子是聚碳酸酯類樹脂、環烯烴類樹脂或丙烯酸類樹脂。 The optical sheet according to claim 1, wherein the transparent polymer is a polycarbonate resin, a cycloolefin resin or an acrylic resin. 如申請專利範圍第1項所述的光學片，其中，所述第一硬塗層的主要成分是紫外線固化性樹脂。 The optical sheet of claim 1, wherein the main component of the first hard coat layer is an ultraviolet curable resin. 如申請專利範圍第5項所述的光學片，其中，所述紫外線固化性樹脂是陽離子聚合性樹脂。 The optical sheet according to claim 5, wherein the ultraviolet curable resin is a cationically polymerizable resin. 如申請專利範圍第1項或第6項所述的光學片，其中，所述第一硬塗層含有抗紫外線劑。 The optical sheet of claim 1 or 6, wherein the first hard coat layer contains an ultraviolet ray-resistant agent. 如申請專利範圍第1項所述的光學片，其中，所述相位差膜是1/4波長膜或1/2波長膜。 The optical sheet of claim 1, wherein the retardation film is a 1/4 wavelength film or a 1/2 wavelength film. 如申請專利範圍第1項所述的光學片，其中，所述光學片還包括高折射率層，該高折射率層形成於所述相位差膜的另一個面側。 The optical sheet of claim 1, wherein the optical sheet further comprises a high refractive index layer formed on the other surface side of the retardation film. 如申請專利範圍第9項所述的光學片，其中，所述高折射率層 的折射率為1.6以上2.3以下。 The optical sheet of claim 9, wherein the high refractive index layer The refractive index is 1.6 or more and 2.3 or less. 一種透明導電性層疊體，包括：申請專利範圍第10項所述的光學片；以及透明導電層，層疊於所述光學片的所述高折射率層的另一個面。 A transparent conductive laminate comprising: the optical sheet according to claim 10; and a transparent conductive layer laminated on the other surface of the high refractive index layer of the optical sheet. 如申請專利範圍第11項所述的透明導電性層疊體，其中，所述高折射率層的折射率與所述透明導電層的折射率的差為0.6以下。 The transparent electroconductive laminate according to claim 11, wherein a difference between a refractive index of the high refractive index layer and a refractive index of the transparent conductive layer is 0.6 or less. 一種觸摸面板，包括申請專利範圍第11項或第12項所述的透明導電性層疊體。 A touch panel comprising the transparent electroconductive laminate according to claim 11 or 12.
TW101143606A 2011-11-22 2012-11-22 An optical sheet, a transparent conductive laminate, and a touch panel TWI551898B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011255124A JP2013109219A (en) 2011-11-22 2011-11-22 Optical sheet, transparent conductive laminate, and touch panel

Publications (2)

Publication Number Publication Date
TW201329542A true TW201329542A (en) 2013-07-16
TWI551898B TWI551898B (en) 2016-10-01

Family

ID=48495235

Family Applications (1)

Application Number Title Priority Date Filing Date
TW101143606A TWI551898B (en) 2011-11-22 2012-11-22 An optical sheet, a transparent conductive laminate, and a touch panel

Country Status (4)

Country Link
JP (1) JP2013109219A (en)
KR (1) KR101495138B1 (en)
CN (1) CN103135159B (en)
TW (1) TWI551898B (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5944880B2 (en) * 2012-12-07 2016-07-05 日東電工株式会社 Laminated body
CN103605176A (en) * 2013-09-17 2014-02-26 京东方科技集团股份有限公司 Retardation film and manufacturing method thereof, and display device
KR102345700B1 (en) * 2014-03-24 2021-12-30 리껭테크노스 가부시키가이샤 Process for producing article from layered hardcoat object, and article formed from layered hardcoat object including poly(meth)acrylimide-based resin layer
CN105892731B (en) * 2014-10-29 2019-05-28 祥达光学（厦门）有限公司 Touch Screen
JP2016177405A (en) * 2015-03-19 2016-10-06 パナソニックＩｐマネジメント株式会社 Touch panel
JP6560133B2 (en) 2015-05-29 2019-08-14 日東電工株式会社 Laminated roll, optical unit, organic EL display device, transparent conductive film, and optical unit manufacturing method
US20170253706A1 (en) * 2016-03-04 2017-09-07 Dongwoo Fine-Chem Co., Ltd. Hard Coating Film
CN107610813A (en) * 2017-08-11 2018-01-19 张家港康得新光电材料有限公司 A kind of double-sided conductive film and preparation method thereof
KR102271026B1 (en) 2017-09-04 2021-06-30 코오롱인더스트리 주식회사 Hard Coating Film Having Multi-Layer and Polyimide film including the same
WO2019107249A1 (en) * 2017-11-28 2019-06-06 Ａｇｃ株式会社 Optical element and light guide element
JP2021536030A (en) 2018-08-14 2021-12-23 アプライド マテリアルズ インコーポレイテッドApplied Materials, Incorporated Multi-layer wet and dry hard coat for flexible cover lenses
KR20230173232A (en) 2019-06-26 2023-12-26 어플라이드 머티어리얼스, 인코포레이티드 Flexible multi-layered cover lens stacks for foldable displays

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW574106B (en) * 1998-02-18 2004-02-01 Dainippon Printing Co Ltd Hard coat film
JP4155651B2 (en) * 1998-02-18 2008-09-24 大日本印刷株式会社 Hard coat film
JP3560532B2 (en) * 2000-05-02 2004-09-02 株式会社巴川製紙所 Antistatic film for display
JP2002036436A (en) 2000-07-19 2002-02-05 Fuji Photo Film Co Ltd Hard coating film and hard coating film with functional thin film
TWI290328B (en) * 2002-05-23 2007-11-21 Nof Corp Transparent conductive laminated film and touch panel
EP1574882B1 (en) * 2002-12-20 2013-01-23 Teijin Limited Transparent conductive laminate, touch panel and liquid crystal display unit with touch panel
CN101044579B (en) * 2004-08-20 2010-11-24 帝人株式会社 Transparent conductive laminated body and transparent touch-sensitive panel
JP2007219013A (en) * 2006-02-14 2007-08-30 Toppan Printing Co Ltd Hard coat film
JP2008129130A (en) * 2006-11-17 2008-06-05 Toppan Printing Co Ltd Hard coat film

Also Published As

Publication number Publication date
KR101495138B1 (en) 2015-02-24
TWI551898B (en) 2016-10-01
CN103135159B (en) 2015-11-25
CN103135159A (en) 2013-06-05
KR20130056831A (en) 2013-05-30
JP2013109219A (en) 2013-06-06

Similar Documents

Publication Publication Date Title
TWI498221B (en) A hard coat film, a transparent conductive laminate, and a touch panel
TWI551898B (en) An optical sheet, a transparent conductive laminate, and a touch panel
TWI494223B (en) A hard coat film, a transparent conductive laminate, and a touch panel
KR101406805B1 (en) Hard coat film, transparent conductive laminate and touch panel
CN109021478B (en) (meth) acrylic resin composition and (meth) acrylic resin film using same
TWI474036B (en) Optical sheet and touch panel
JP2010085978A (en) Liquid crystal display protection plate
JP5888864B2 (en) Acrylic resin film, polarizing plate using the same, and method for producing acrylic resin film
JP2013020120A (en) Hard coat film and touch panel
TW201303440A (en) Polarizing plate and liquid crystal display device
TWI639030B (en) Laminated body, manufacturing method thereof, retardation film, polarizing film, and manufacturing method of IPS liquid crystal panel
TW201736135A (en) Hard coat film and application of same
JP2016218478A (en) Acrylic resin film and polarizing plate
JP2017219622A (en) Light diffusion film and method for producing the same, and display device
TW201531396A (en) Multilayer polyester film and polarizing plate using same
JP2018078090A (en) Transparent conductive film and touch panel using the same
WO2011108494A1 (en) Conductive laminate film and touch panel using the same
JP2014133408A (en) Surface-treated laminate film and polarizing plate using the same
JP4815742B2 (en) Transparent conductive film, touch panel using the same, and manufacturing method thereof
JP6009013B2 (en) Method for producing laminate and method for producing acrylic resin film
JP2005174665A (en) Transparent conductive film and touch panel, and manufacturing method therefor
JP2015108832A (en) Liquid crystal display protection plate

Legal Events

Date Code Title Description
MM4A Annulment or lapse of patent due to non-payment of fees