TWI666117B - Laminated body for manufacturing polarizing film, and manufacturing method of polarizing film - Google Patents
Laminated body for manufacturing polarizing film, and manufacturing method of polarizing film Download PDFInfo
- Publication number
- TWI666117B TWI666117B TW104136483A TW104136483A TWI666117B TW I666117 B TWI666117 B TW I666117B TW 104136483 A TW104136483 A TW 104136483A TW 104136483 A TW104136483 A TW 104136483A TW I666117 B TWI666117 B TW I666117B
- Authority
- TW
- Taiwan
- Prior art keywords
- laminated body
- based resin
- knurling
- pva
- film
- Prior art date
Links
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
本發明提供一種可製造外觀優異之偏光膜的積層體。本發明的積層體具備長條狀且含有聚乙烯醇系樹脂的聚乙烯醇系樹脂膜及配置在聚乙烯醇系樹脂膜單側的樹脂基材，且該積層體形成有從一面突出的滾花。 The present invention provides a laminated body capable of producing a polarizing film with excellent appearance. The laminated body of the present invention includes a long polyvinyl alcohol-based resin film containing a polyvinyl alcohol-based resin, and a resin base material disposed on one side of the polyvinyl alcohol-based resin film. flower.
Description
本發明涉及一種在偏光膜的製造中使用的積層體。 This invention relates to the laminated body used for manufacture of a polarizing film.
提出了一種藉由在樹脂基材上形成聚乙烯醇系樹脂層，並將該積層體拉伸、染色來獲得偏光膜的方法(例如，專利文獻1)。根據這樣的方法可獲得厚度薄的偏光膜，因此，可有助於例如影像顯示裝置的薄型化而被關注。但是，在使用了樹脂基材的情況下，有得到的偏光膜容易產生外觀不良的問題。 A method has been proposed in which a polyvinyl alcohol-based resin layer is formed on a resin substrate, and the laminated body is stretched and dyed to obtain a polarizing film (for example, Patent Document 1). According to such a method, since a thin polarizing film can be obtained, it can attract attention, for example, by contributing to a reduction in thickness of an image display device. However, when a resin substrate is used, there is a problem that the resulting polarizing film is liable to cause poor appearance.
專利文獻1：日本特開2000-338329號公報 Patent Document 1: Japanese Patent Application Laid-Open No. 2000-338329
本發明是為了解決上述以往的課題而作成的，其主要的目的是提供一種可製造外觀優異之偏光膜的積層 體。 The present invention has been made to solve the above-mentioned conventional problems, and a main object thereof is to provide a laminate capable of manufacturing a polarizing film having excellent appearance. body.
本發明的積層體用於偏光膜的製造，其具備長條狀且含有聚乙烯醇系樹脂的聚乙烯醇系樹脂膜及配置在該聚乙烯醇系樹脂膜單側的樹脂基材，且該積層體形成有從一面突出的滾花。 The laminated body of the present invention is used for manufacturing a polarizing film, and includes a long polyvinyl alcohol resin film containing a polyvinyl alcohol resin and a resin substrate disposed on one side of the polyvinyl alcohol resin film. The laminated body is formed with knurls protruding from one side.
在1個實施方式中，上述滾花以在樹脂基材側突出的方式形成。 In one embodiment, the knurling is formed so as to protrude on the resin substrate side.
在1個實施方式中，上述滾花被設置在寬度方向端部。 In one embodiment, the knurling is provided at an end portion in the width direction.
在1個實施方式中，上述滾花的形成區域沿長度方向延伸。 In one embodiment, the knurling formation area extends in the longitudinal direction.
在1個實施方式中，上述滾花的高度為5μm~15μm。 In one embodiment, the height of the knurling is 5 μm to 15 μm.
在1個實施方式中，積層體的寬度為1500mm~2700mm。 In one embodiment, the laminated body has a width of 1500 mm to 2700 mm.
在1個實施方式中，上述聚乙烯醇系樹脂膜被拉伸。 In one embodiment, the polyvinyl alcohol-based resin film is stretched.
在1個實施方式中，上述樹脂基材含有聚對苯二甲酸乙二醇酯系樹脂。 In one embodiment, the resin substrate contains a polyethylene terephthalate-based resin.
在1個實施方式中，積層體被捲取為輥狀。 In one embodiment, the laminated body is wound into a roll shape.
根據本發明的另一方面，提供一種偏光膜之製造方法。該偏光膜之製造方法依序包括：將上述積層體的滾花形成部切除的步驟及將該積層體拉伸的步驟。 According to another aspect of the present invention, a method for manufacturing a polarizing film is provided. The manufacturing method of the polarizing film includes a step of cutting out the knurling forming portion of the laminated body and a step of stretching the laminated body in this order.
在1個實施方式中，上述拉伸為水中拉伸。 In one embodiment, the stretching is underwater stretching.
根據本發明，提供一種具備聚乙烯醇系樹脂膜及配置在該聚乙烯醇系樹脂膜單側的樹脂基材，且形成有從一面突出的滾花的積層體。這樣的積層體即使在製造步驟中被捲取為輥狀，也可防止捲緊(厚度不均)、褶皺的產生。其結果，能夠製造外觀優異的偏光膜。 According to the present invention, there is provided a laminated body including a polyvinyl alcohol-based resin film and a resin base material disposed on one side of the polyvinyl alcohol-based resin film, and formed with a knurling protruding from one side. Even if such a laminated body is wound into a roll shape in the manufacturing process, it can prevent the occurrence of tightness (uneven thickness) and wrinkles. As a result, a polarizing film having excellent appearance can be manufactured.
10‧‧‧積層體 10‧‧‧ laminated body
11‧‧‧樹脂基材 11‧‧‧ resin substrate
12‧‧‧聚乙烯醇(PVA)系樹脂膜 12‧‧‧polyvinyl alcohol (PVA) resin film
13‧‧‧滾花 13‧‧‧ knurled
20‧‧‧區域 20‧‧‧area
31‧‧‧滾花輥、輥對 31‧‧‧Knurled roller, roller pair
32‧‧‧支撐輥、輥對 32‧‧‧Support roller, roller pair
31a‧‧‧突起 31a‧‧‧ protrusion
圖1是本發明1個實施方式之積層體的外觀平面圖。 FIG. 1 is an external plan view of a laminated body according to an embodiment of the present invention.
圖2是顯示圖1中所示積層體之滾花的形成方法的圖。 FIG. 2 is a view showing a method of forming a knurling of the laminated body shown in FIG. 1. FIG.
以下，對本發明的1個實施方式進行說明，但本發明不限定於這些實施方式。 Hereinafter, one embodiment of the present invention will be described, but the present invention is not limited to these embodiments.
A.積層體 A. Laminate
圖1及圖2是本發明的1個實施方式的偏光膜製造用之積層體的概略圖，圖1是積層體的外觀平面圖，圖2是示出圖1中所示的積層體的滾花的形成方法的圖。積層體10具備長條狀的聚乙烯醇系樹脂(以下，稱為“PVA系樹脂”)膜12及配置在PVA系樹脂膜12單側的樹脂基材11。PVA系樹脂膜12的寬度可設定為與樹脂基材11的寬度大致相同或小於樹脂基材11的寬度。在積層體10上形成有從其一面突出的滾花13。滾花13較佳在PVA系樹脂膜12及樹脂基材11重合的部分形成。在圖示例中，滾花13在積層體10的寬度方向兩端部斷續地形成，排列有滾花13的滾花形成區域20在長度方向延伸。需要說明的是，本說明書中的“滾花”是指在積層體表面形成的凹凸結構。 1 and 2 are schematic views of a laminated body for manufacturing a polarizing film according to an embodiment of the present invention. FIG. 1 is an external plan view of the laminated body. FIG. 2 is a knurling showing the laminated body shown in FIG. 1. Of the formation method. The laminated body 10 includes a long polyvinyl alcohol-based resin (hereinafter referred to as “PVA-based resin”) film 12 and a resin substrate 11 disposed on one side of the PVA-based resin film 12. The width of the PVA-based resin film 12 can be set to be substantially the same as or smaller than the width of the resin substrate 11. The laminated body 10 is formed with knurls 13 protruding from one side thereof. The knurling 13 is preferably formed at a portion where the PVA-based resin film 12 and the resin base material 11 overlap. In the example shown in the figure, knurling 13 is intermittently formed at both ends in the width direction of the laminated body 10, and the knurling formation region 20 in which the knurling 13 is arranged extends in the longitudinal direction. In addition, "knurling" in this specification means the uneven structure formed on the surface of a laminated body.
滾花13可以在樹脂基材11側突出的方式形成，也可以在PVA系樹脂膜12側突出的方式形成，如圖所示，藉由使滾花13在樹脂基材11側突出，可對積層體10良好地形成滾花。 The knurling 13 may be formed so as to protrude on the resin substrate 11 side, or may be formed so as to protrude on the PVA-based resin film 12 side. The laminated body 10 formed a knurl well.
積層體(樹脂基材)的寬度可設定為任意的適當的值。代表性的為800mm以上，較佳為1500mm~2700mm。從成品率的觀點出發，滾花較佳在距離積層體(樹脂基材)的寬度方向端邊5mm~10mm的位置形成。上述滾花形成區域的寬度較佳為5mm~30mm。滾花形成區域的寬度相對於積層體的寬度的比率較佳為0.7%~1.5%。 The width of the laminated body (resin substrate) can be set to any appropriate value. It is typically 800 mm or more, preferably 1500 mm to 2700 mm. From the standpoint of yield, knurling is preferably formed at a position 5 mm to 10 mm from the widthwise end of the laminate (resin substrate). The width of the knurling area is preferably 5 mm to 30 mm. The ratio of the width of the knurling area to the width of the laminated body is preferably 0.7% to 1.5%.
作為各個滾花的形狀，可採用任意的適當形狀。作為各個滾花(凸部)的三維形狀的具體例，可以舉出立方體、長方體、圓錐、角錐(三角錐、四角錐)、圓頂狀(半球狀)、台形狀(圓錐台、角錐台)。與圖示例不同，滾花可以沿著長度方向連續地(一連串地)形成。在這種情況下，從滾花的長度方向看到的截面形狀例如可以舉出四邊形(長方形、正方形、梯形)、三角形、圓頂狀(半圓狀)。 Any appropriate shape can be adopted as the shape of each knurling. Specific examples of the three-dimensional shape of each knurling (convex portion) include a cube, a rectangular parallelepiped, a cone, a pyramid (triangular pyramid, quadrangular pyramid), a dome shape (hemispherical shape), and a truncated shape (conical frustum, pyramid frustum) . Unlike the example shown in the figure, knurling can be formed continuously (in a series) along the length direction. In this case, the cross-sectional shape seen from the longitudinal direction of the knurling includes, for example, a quadrangle (rectangle, square, trapezoid), triangle, and dome shape (semi-circular shape).
滾花的高度(距離滾花非形成區域的積層體表面的高度)較佳為5μm~15μm。滾花的高度相對於後述的樹脂基材的厚度的比率較佳為5%~40%。 The height of the knurling (the height from the surface of the multilayer body of the non-knurling area) is preferably 5 μm to 15 μm. The ratio of the height of the knurling to the thickness of the resin substrate described later is preferably 5% to 40%.
A-1.PVA系樹脂膜 A-1.PVA resin film
作為形成上述PVA系樹脂膜的PVA系樹脂，可採用任意的適當樹脂。例如，可以舉出聚乙烯醇、乙烯-乙烯醇共聚物。聚乙烯醇是藉由將聚乙酸乙烯酯皂化而得到的。乙烯- 乙烯醇共聚物是藉由將乙烯-乙酸乙烯酯共聚物皂化而得到的。PVA系樹脂的皂化度通常為85莫耳%~100莫耳%，較佳為95.0莫耳%~99.95莫耳%，更佳為99.0莫耳%~99.93莫耳%。皂化度可根據JIS K 6726-1994來求出。藉由使用這樣的皂化度的PVA系樹脂，可得到耐久性優異的偏光膜。在皂化度過高的情況下，有會凝膠化之虞。 As the PVA-based resin forming the PVA-based resin film, any appropriate resin can be used. Examples include polyvinyl alcohol and ethylene-vinyl alcohol copolymer. Polyvinyl alcohol is obtained by saponifying polyvinyl acetate. Ethylene- The vinyl alcohol copolymer is obtained by saponifying an ethylene-vinyl acetate copolymer. The saponification degree of the PVA-based resin is usually 85 mol% to 100 mol%, preferably 95.0 mol% to 99.95 mol%, and more preferably 99.0 mol% to 99.93 mol%. The degree of saponification can be determined in accordance with JIS K 6726-1994. By using a PVA-based resin having such a degree of saponification, a polarizing film having excellent durability can be obtained. When the degree of saponification is too high, there is a possibility of gelation.
PVA系樹脂的平均聚合度可根據目的而適當地選擇。平均聚合度通常為1000~10000，較佳為1200~4500，更佳為1500~4300。需要說明的是，平均聚合度可根據JIS K 6726-1994來求出。 The average degree of polymerization of the PVA-based resin can be appropriately selected depending on the purpose. The average degree of polymerization is usually 1000 to 10,000, preferably 1200 to 4500, and more preferably 1500 to 4300. The average degree of polymerization can be determined in accordance with JIS K 6726-1994.
PVA系樹脂膜的厚度例如為20μm以下，較佳為15μm以下。另一方面，PVA系樹脂膜的厚度較佳為5μm以上。 The thickness of the PVA-based resin film is, for example, 20 μm or less, and preferably 15 μm or less. On the other hand, the thickness of the PVA-based resin film is preferably 5 μm or more.
PVA系樹脂膜代表性的是藉由將含有PVA系樹脂的塗布液塗布在塗布面而形成。作為塗布液，代表性的可以舉出使PVA系樹脂溶解於溶劑而成的溶液。作為使PVA系樹脂溶解的溶劑，例如，可以使用水、二甲基亞碸、二甲基甲醯胺、二甲基乙醯胺、N-甲基吡咯烷酮、各種二元醇類、三羥甲基丙烷等多元醇類；乙二胺、二亞乙基三胺等胺類。其等可以單獨使用或者組合使用兩種以上。這些溶劑之中，較佳為水。溶液的PVA系樹脂濃度可設定為任意的適當的值。例如，根據PVA系樹脂的聚合度、皂化度等來設定。溶液的PVA系樹脂濃度例如相對於溶劑100重量份為3重量份~20重量份。 The PVA-based resin film is typically formed by applying a coating solution containing a PVA-based resin to a coating surface. A typical example of the coating liquid is a solution obtained by dissolving a PVA-based resin in a solvent. As a solvent for dissolving the PVA-based resin, for example, water, dimethylmethylene, dimethylformamide, dimethylacetamide, N-methylpyrrolidone, various glycols, and trimethylol can be used. Polyols such as propane; amines such as ethylenediamine and diethylenetriamine. These can be used alone or in combination of two or more. Among these solvents, water is preferred. The PVA-based resin concentration of the solution can be set to any appropriate value. For example, it is set according to the polymerization degree, saponification degree, and the like of the PVA-based resin. The PVA-based resin concentration of the solution is, for example, 3 to 20 parts by weight based on 100 parts by weight of the solvent.
上述塗布液可以包含添加劑。作為添加劑，例如，可以舉出增塑劑、表面活性劑等。作為增塑劑，例如，可以舉出乙二醇、丙三醇等多元醇。作為表面活性劑，例如，可以舉出非離子表面活性劑。這些可以為了更進一步提高得到的PVA系樹脂膜的均勻性、染色性、拉伸性而使用。另外，作為添加劑，例如，可以舉出易黏接成分。藉由使用易黏接成分，可提高樹脂基材與PVA系樹脂膜的密合性。其結果，例如，能夠抑制PVA系樹脂膜從樹脂基材剝離等不良情況，良好地進行後述的染色、水中拉伸。作為易黏接成分，例如，可以使用乙醯乙醯基改性PVA等改性PVA。 The coating liquid may contain additives. Examples of the additives include plasticizers and surfactants. Examples of the plasticizer include polyhydric alcohols such as ethylene glycol and glycerin. Examples of the surfactant include a nonionic surfactant. These can be used in order to further improve the uniformity, dyeability, and stretchability of the obtained PVA-based resin film. Examples of the additive include an easily adhesive component. By using an easily-adhesive component, the adhesiveness of a resin base material and a PVA-type resin film can be improved. As a result, for example, defects such as peeling of the PVA-based resin film from the resin substrate can be suppressed, and dyeing and stretching in water described later can be performed favorably. As the easily-adhesive component, for example, a modified PVA such as acetamidine-modified PVA can be used.
作為塗布液的塗布方法，可以根據上述塗布面的形態等採用任意的適當方法。例如，可以舉出輥塗法、旋轉塗布法、線棒塗布法、浸塗法、模塗法、簾幕塗布法、噴塗法、刮塗法(逗點塗布法等)。塗布液的塗布、乾燥溫度例如為20℃以上，較佳為50℃以上。 As a coating method of a coating liquid, arbitrary appropriate methods can be employ | adopted according to the form of the said coating surface, etc. Examples thereof include a roll coating method, a spin coating method, a bar coating method, a dip coating method, a die coating method, a curtain coating method, a spray coating method, and a knife coating method (comma coating method, etc.). The application and drying temperature of the coating liquid is, for example, 20 ° C or higher, and preferably 50 ° C or higher.
在1個實施方式中，PVA系樹脂膜被拉伸。作為PVA系樹脂膜的拉伸方法，可採用任意的適當方法。另外，作為PVA系樹脂膜的拉伸方向，可選擇任意的適當方向。 In one embodiment, the PVA-based resin film is stretched. As a stretching method of the PVA-based resin film, any appropriate method can be adopted. In addition, as the stretching direction of the PVA-based resin film, any appropriate direction can be selected.
A-2.樹脂基材 A-2. Resin substrate
作為上述樹脂基材的構成材料，可採用任意的適當材料。例如，可以舉出聚對苯二甲酸乙二醇酯系樹脂等酯系樹脂；環烯烴系樹脂、聚丙烯等烯烴系樹脂；(甲基)丙烯酸系樹脂；聚醯胺系樹脂；聚碳酸酯系樹脂；其等的共聚 物樹脂。較佳使用聚對苯二甲酸乙二醇酯系樹脂。其中，較佳使用非晶質的聚對苯二甲酸乙二醇酯系樹脂。作為非晶質的聚對苯二甲酸乙二醇酯系樹脂的具體例，可以舉出還含有間苯二甲酸作為二元羧酸的共聚物、或含有環己基二甲醇作為二元醇的共聚物。 As a constituent material of the resin substrate, any appropriate material can be adopted. For example, ester resins such as polyethylene terephthalate resins; olefin resins such as cycloolefin resins and polypropylene; (meth) acrylic resins; polyamide resins; polycarbonate Series resins; other copolymers 物 材料。 Resin. A polyethylene terephthalate-based resin is preferably used. Among these, an amorphous polyethylene terephthalate-based resin is preferably used. Specific examples of the amorphous polyethylene terephthalate-based resin include a copolymer further containing isophthalic acid as a dicarboxylic acid, or a copolymer containing cyclohexyldimethanol as a glycol. Thing.
樹脂基材較佳具有比上述PVA系樹脂膜的彈性模量(例如，壓痕彈性模量)高的彈性模量。藉由使用這樣的樹脂基材，可良好地形成滾花。具體而言，雖然在PVA系樹脂膜單獨的狀態下有時會難以形成滾花，但藉由製成與樹脂基材的積層結構，可良好地形成滾花。 The resin substrate preferably has an elastic modulus higher than the elastic modulus (for example, indentation elastic modulus) of the PVA-based resin film. By using such a resin substrate, knurling can be favorably formed. Specifically, although knurling may be difficult to form in a state where the PVA-based resin film is alone, knurling can be favorably formed by forming a laminated structure with a resin substrate.
樹脂基材的玻璃化轉變溫度(Tg)較佳為120℃以下，更佳為100℃以下。這是因為：將積層體拉伸的情況下，能夠抑制PVA系樹脂膜的結晶化，並充分地確保拉伸性(特別是水中拉伸的拉伸性)。其結果，能夠製造具有優異的光學特性(例如，偏光度)的偏光膜。另一方面，樹脂基材的玻璃化轉變溫度較佳為60℃以上。需要說明的是，玻璃化轉變溫度(Tg)是根據JIS K 7121而求出的值。 The glass transition temperature (Tg) of the resin substrate is preferably 120 ° C or lower, and more preferably 100 ° C or lower. This is because when the laminate is stretched, crystallization of the PVA-based resin film can be suppressed, and stretchability (especially stretchability in water) can be sufficiently ensured. As a result, a polarizing film having excellent optical characteristics (for example, polarization degree) can be manufactured. On the other hand, the glass transition temperature of the resin substrate is preferably 60 ° C or higher. The glass transition temperature (Tg) is a value obtained in accordance with JIS K 7121.
樹脂基材的吸水率較佳為0.2%以上，更佳為0.3%以上。這樣的樹脂基材吸收水，水到起增塑劑的作用，從而能夠可塑化。其結果，能夠使拉伸應力大幅地降低，可使拉伸性優異。另一方面，樹脂基材的吸水率較佳為3.0%以下，更佳為1.0%以下。藉由使用這樣的樹脂基材，能夠防止在製造時樹脂基材的尺寸穩定性顯著降低、得到的偏光膜的外觀惡化等不良情況。另外，能夠防止在水中拉伸 時發生斷裂或者PVA系樹脂膜從樹脂基材剝離。需要說明的是，吸水率是根據JIS K 7209求出的值。 The water absorption of the resin substrate is preferably 0.2% or more, and more preferably 0.3% or more. Such a resin substrate absorbs water, and the water functions as a plasticizer to be plasticizable. As a result, the tensile stress can be greatly reduced, and the stretchability can be improved. On the other hand, the water absorption of the resin substrate is preferably 3.0% or less, and more preferably 1.0% or less. By using such a resin substrate, it is possible to prevent problems such as a significant decrease in the dimensional stability of the resin substrate at the time of production and deterioration of the appearance of the obtained polarizing film. In addition, it can prevent stretching in water When it breaks, the PVA-based resin film peels from the resin substrate. In addition, a water absorption is a value calculated | required based on JISK7209.
樹脂基材的厚度較佳為20μm以上，更佳為50μm以上。藉由使用這樣的樹脂基材，可良好地形成滾花。另一方面，樹脂基材的厚度較佳為300μm以下，更佳為200μm以下。 The thickness of the resin substrate is preferably 20 μm or more, and more preferably 50 μm or more. By using such a resin substrate, knurling can be favorably formed. On the other hand, the thickness of the resin substrate is preferably 300 μm or less, and more preferably 200 μm or less.
可以對樹脂基材表面實施表面改性處理(例如，電暈處理等)，也可以形成易黏接層。藉由這樣的處理，可得到樹脂基材與PVA系樹脂膜的密合性優異的積層體。另外，可在樹脂基材的沒有配置PVA系樹脂膜的一側形成功能層(例如，抗靜電層)。藉由形成功能層，能夠賦予抗黏連性。 The surface of the resin substrate may be subjected to a surface modification treatment (for example, a corona treatment), or an easily-adhesive layer may be formed. By such a treatment, a laminated body having excellent adhesion between the resin substrate and the PVA-based resin film can be obtained. In addition, a functional layer (for example, an antistatic layer) may be formed on the side of the resin substrate on which the PVA-based resin film is not disposed. By forming a functional layer, anti-blocking properties can be imparted.
A-3.積層體的製作方法 A-3. Manufacturing method of laminated body
PVA系樹脂膜及樹脂基材的積層物可藉由任意的適當方法來製作。例如，可以舉出在樹脂基材上形成PVA系樹脂膜的方法，在另行形成的PVA系樹脂膜上積層樹脂基材的方法。在樹脂基材上形成PVA系樹脂膜的情況下，上述塗布面是樹脂基材。在另行形成PVA系樹脂膜的情況下，PVA系樹脂膜及樹脂基材可透過黏接層(使用黏接劑、黏合劑)而積層，也可使其等密合(實質上不使用黏接劑、黏合劑)而積層。 The laminate of the PVA-based resin film and the resin substrate can be produced by any appropriate method. For example, a method of forming a PVA-based resin film on a resin substrate, and a method of laminating a resin substrate on a separately formed PVA-based resin film may be mentioned. When a PVA-based resin film is formed on a resin substrate, the coating surface is a resin substrate. When a PVA-based resin film is separately formed, the PVA-based resin film and the resin substrate may be laminated through an adhesive layer (using an adhesive or an adhesive), or may be closely adhered (substantially no adhesion is used) Agent, adhesive)).
在PVA系樹脂膜如上所述被拉伸的情況下，較佳對PVA系樹脂膜及樹脂基材的積層物進行該拉伸。在1個實施方式中，利用空中拉伸方式在長度方向上拉伸PVA樹脂 膜及樹脂基材的積層物。拉伸倍率例如為1.5倍以上且3.5倍以下。拉伸溫度例如為95℃~150℃。 When the PVA-based resin film is stretched as described above, it is preferable to perform the stretching on the laminate of the PVA-based resin film and the resin substrate. In one embodiment, the PVA resin is stretched in the longitudinal direction by an air stretching method. Laminate of film and resin substrate. The stretching ratio is, for example, 1.5 times or more and 3.5 times or less. The stretching temperature is, for example, 95 ° C to 150 ° C.
上述滾花可藉由任意的適當方法來形成。在1個實施方式中，如圖所示，在長度方向上輸送積層體10，並用滾花輥31及支撐輥32層夾持積層體10，將在滾花輥31的周面上形成的突起31a按壓在積層體10上，由此形成滾花(凹凸結構)13。雖未圖示，但滾花形成輥對31、32的按壓力及周面溫度可以適宜地調整。在圖示例中，將滾花輥31按壓在樹脂基材11側，形成從樹脂基材11的表面突出的滾花13。與在PVA系樹脂膜側按壓滾花輥相比，藉由如圖示例所示地在樹脂基材側按壓滾花輥，可良好地形成滾花。 The knurling can be formed by any appropriate method. In one embodiment, as shown in the figure, the laminated body 10 is conveyed in the longitudinal direction, and the laminated body 10 is sandwiched by the knurling roller 31 and the support roller 32. The protrusions formed on the peripheral surface of the knurling roller 31 31a is pressed against the laminated body 10, thereby forming a knurling (concave-convex structure) 13. Although not shown, the pressing force and the peripheral surface temperature of the knurling forming roller pairs 31 and 32 can be appropriately adjusted. In the example shown in the figure, the knurling roller 31 is pressed against the resin base material 11 to form a knurling 13 protruding from the surface of the resin base material 11. Compared with pressing the knurling roller on the PVA-based resin film side, knurling rollers can be formed better by pressing the knurling roller on the resin substrate side as shown in the example.
滾花可在任意的適當時刻形成。在圖示例中，雖然對PVA樹脂膜及樹脂基材的積層物形成了滾花，但例如也可以與圖示例不同地、在樹脂基材上形成滾花後形成或積層PVA系樹脂膜。 The knurling can be formed at any appropriate time. In the illustrated example, although knurling is formed on the laminate of the PVA resin film and the resin substrate, for example, it is possible to form or laminate the PVA-based resin film after knurling is formed on the resin substrate, unlike the illustrated example. .
A-4.其他 A-4. Other
在1個實施方式中，上述積層體被捲取為輥狀。捲取張力代表性的為300N~600N。捲取可以PVA系樹脂膜為內側(芯材側)的方式進行，也可以PVA系樹脂膜為外側的方式進行。在偏光膜的製造步驟中，PVA系樹脂膜及樹脂基材的積層物可以捲取而成的狀態直接保管(放置)，但若在積層物(主要是樹脂基材)中存在局部的膜厚不均，則在捲取時會產生捲緊、褶皺，引起所得偏光膜的外觀降低。保管期間越長，這樣的問題變得越顯著。本發明的積層體 即使被捲取為輥狀，也可防止捲緊、褶皺的發生。其結果，能夠製造外觀優異的偏光膜。 In one embodiment, the laminated body is wound into a roll shape. The winding tension is typically 300N ~ 600N. The winding may be performed such that the PVA-based resin film is inside (core material side), or may be performed such that the PVA-based resin film is outside. In the manufacturing process of the polarizing film, the laminate of the PVA-based resin film and the resin substrate can be directly stored (stored) in a rolled state. Unevenness may cause tightness and wrinkles during winding, which may cause a decrease in the appearance of the obtained polarizing film. The longer the storage period, the more significant such problems become. The laminated body of the present invention Even if it is wound into a roll shape, it can prevent winding tightness and wrinkles. As a result, a polarizing film having excellent appearance can be manufactured.
上述捲緊的產生頻率可以根據積層物(主要是樹脂基材)的寬度方向的厚度分佈而變動。具體而言，即使積層物(主要是樹脂基材)整體的厚度差小，但只要局部發生厚度不均，就可因捲取而產生捲緊。因此，在1個實施方式中，上述滾花的高度可設定為比樹脂基材的厚度的偏差高。較佳的是，滾花的高度(平均高度)設定為比樹脂基材的厚度的偏差(30mm寬度)高。 The frequency of occurrence of the above-mentioned crimping may vary depending on the thickness distribution in the width direction of the laminate (mainly a resin substrate). Specifically, even if the thickness difference of the entire laminate (mainly a resin substrate) is small, as long as the thickness unevenness occurs locally, the winding may be caused by winding. Therefore, in one embodiment, the height of the knurling can be set to be higher than the variation in the thickness of the resin substrate. Preferably, the height (average height) of the knurling is set to be higher than the deviation (30 mm width) of the thickness of the resin substrate.
B.偏光膜 B. Polarizing film
偏光膜藉由實施用於將上述積層體的PVA系樹脂膜製成偏光膜的處理來製造。作為用於製成偏光膜的處理，例如可以舉出染色處理、拉伸處理、不溶化處理、交聯處理、清洗處理、乾燥處理。這些處理可根據目的而適宜地選擇。另外，處理順序、處理的時刻、處理次數等可適宜設定。積層體的滾花形成部可在任意的適當時刻切除。在1個實施方式中，對切除了滾花形成部的積層體實施拉伸處理。作為滾花形成部的切除方法，可採用任意的適當方法。具體而言，如圖示所示地在積層體的寬度方向端部形成了滾花的情況下，藉由將積層體的寬度方向端部切斷(slit)來切除滾花形成部。作為切斷手段，例如，可以舉出圓刀片、碟形刀片等切斷刀片；雷射。以下，對上述各種處理進行說明。 The polarizing film is produced by subjecting the PVA-based resin film of the laminated body to a polarizing film. Examples of the treatment for forming a polarizing film include a dyeing treatment, a stretching treatment, an insolubilization treatment, a crosslinking treatment, a cleaning treatment, and a drying treatment. These processes can be appropriately selected depending on the purpose. In addition, the processing order, processing time, number of processing times, and the like can be appropriately set. The knurling portion of the laminated body can be cut off at any appropriate timing. In one embodiment, the laminated body from which the knurling formation portion is cut is subjected to a stretching treatment. As a method for removing the knurling portion, any appropriate method can be adopted. Specifically, when knurling is formed in the widthwise end portion of the laminated body as shown in the figure, the knurling forming portion is cut by slitting the widthwise end portion of the laminated body. Examples of the cutting means include cutting blades such as round blades and dish blades; and lasers. The various processes described above will be described below.
(染色處理) (Dyeing treatment)
上述染色處理代表性的是藉由二色性物質將PVA系樹脂膜染色來進行。較佳藉由使PVA系樹脂膜吸附二色性物質來進行。作為該吸附方法，例如，可以舉出使PVA系樹脂膜(積層體)浸漬在含有二色性物質的染色液中的方法、對PVA系樹脂膜塗覆該染色液的方法、對PVA系樹脂膜噴霧該染色液的方法等。較佳使積層體浸漬在染色液中的方法。這是因為，二色性物質可良好地吸附。 The dyeing process is typically performed by dyeing a PVA-based resin film with a dichroic substance. It is preferable to perform it by making a PVA-type resin film adsorb a dichroic substance. Examples of the adsorption method include a method of immersing a PVA-based resin film (laminate) in a dyeing solution containing a dichroic substance, a method of applying the dyeing solution to a PVA-based resin film, and a method of applying a PVA-based resin A method of spraying the dyeing solution on a film, and the like. A method of immersing the laminate in a dyeing solution is preferred. This is because the dichroic substance can be adsorbed well.
作為上述二色性物質，例如，可以舉出碘、有機染料。其等可以單獨使用或者組合使用兩種以上。二色性物質較佳為碘。在使用碘作為二色性物質的情況下，上述染色液較佳為碘水溶液。碘的配混量相對於水100重量份較佳為0.1重量份~0.5重量份。為了提高碘在水中的溶解度，較佳在碘水溶液中配混碘化物。作為碘化物，例如，可以舉出碘化鉀、碘化鋰、碘化鈉、碘化鋅、碘化鋁、碘化鉛、碘化銅、碘化鋇、碘化鈣、碘化錫、碘化鈦等。這些碘化物之中，較佳為碘化鉀。碘化物的配混量相對於水100重量份較佳為0.02重量份~20重量份，更佳為0.1重量份~10重量份。 Examples of the dichroic material include iodine and organic dyes. These can be used alone or in combination of two or more. The dichroic substance is preferably iodine. When iodine is used as the dichroic substance, the dyeing solution is preferably an iodine aqueous solution. The compounding amount of iodine is preferably 0.1 to 0.5 parts by weight based on 100 parts by weight of water. In order to increase the solubility of iodine in water, it is preferable to mix iodide with an iodine aqueous solution. Examples of the iodide include potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, and titanium iodide. Wait. Among these iodides, potassium iodide is preferred. The compounding amount of the iodide is preferably 0.02 to 20 parts by weight, and more preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of water.
為了抑制PVA系樹脂的溶解，染色液在染色時的液體溫度較佳為20℃~50℃。在使PVA系樹脂膜浸漬在染色液中的情況下，為了確保PVA系樹脂膜的透過率，浸漬時間較佳為5秒~5分鐘。另外，染色條件(濃度、液體溫度、浸漬時間)可以最終得到的偏光膜的偏光度或單體透過率為規定的範圍的方式進行設定。在1個實施方式中，以得到 的偏光膜的偏光度為99.98%以上的方式設定浸漬時間。在其他的實施方式中，以得到的偏光膜的單體透過率為40%~44%的方式設定浸漬時間。 In order to suppress the dissolution of the PVA-based resin, the liquid temperature of the dyeing liquid during dyeing is preferably 20 ° C to 50 ° C. When the PVA-based resin film is immersed in the dyeing liquid, in order to ensure the transmittance of the PVA-based resin film, the immersion time is preferably 5 seconds to 5 minutes. In addition, the dyeing conditions (concentration, liquid temperature, and immersion time) can be set so that the polarization degree or monomer transmittance of the polarizing film finally obtained will be within a predetermined range. In one embodiment, to get Set the immersion time so that the degree of polarization of the polarizing film is 99.98% or more. In other embodiments, the immersion time is set so that the monomer transmittance of the obtained polarizing film is 40% to 44%.
(拉伸處理) (Stretching treatment)
作為積層體的拉伸方法，可以採用任意的適當方法。具體而言，可以是固定端拉伸(例如，使用拉幅機的方法)，也可以是自由端拉伸(例如，使積層體通過圓周速度不同的輥間而進行單軸拉伸的方法)。另外，可以是同時雙軸拉伸(例如，使用同時雙軸拉伸機的方法)，也可以是逐次雙軸拉伸。積層體的拉伸可以在一個階段進行，也可以分多個階段進行。 As a stretching method of the laminated body, any appropriate method can be adopted. Specifically, it may be fixed-end stretching (for example, a tenter method) or free-end stretching (for example, a uniaxial stretching method in which a laminated body is passed between rollers having different peripheral speeds). . In addition, it may be simultaneous biaxial stretching (for example, a method using a simultaneous biaxial stretching machine), or it may be sequential biaxial stretching. Stretching of a laminated body may be performed in one stage, or may be performed in multiple stages.
拉伸處理可以是一邊將積層體浸漬在拉伸浴中一邊進行的水中拉伸方式，也可以是空中拉伸方式。較佳為實施至少1次水中拉伸處理，更佳為將水中拉伸處理及空中拉伸處理組合。藉由水中拉伸，可在低於上述樹脂基材、PVA系樹脂膜的玻璃化轉變溫度(代表性的為80℃左右)的溫度下進行拉伸，能夠抑制PVA系樹脂膜的結晶化，並以高倍率地拉伸PVA系樹脂膜。其結果，能夠製造具有優異的光學特性(例如，偏光度)的偏光膜。需要說明的是，在將水中拉伸處理及空中拉伸處理組合的情況下，空中拉伸處理可以是對上述的積層物的空中拉伸處理。 The stretching treatment may be an underwater stretching method in which the laminated body is immersed in a stretching bath, or may be an aerial stretching method. It is preferable to perform the underwater stretching treatment at least once, and it is more preferable to combine the underwater stretching treatment and the aerial stretching treatment. Stretching in water enables stretching at a temperature lower than the glass transition temperature (typically about 80 ° C.) of the resin substrate and the PVA-based resin film, thereby suppressing crystallization of the PVA-based resin film. The PVA-based resin film is stretched at a high magnification. As a result, a polarizing film having excellent optical characteristics (for example, polarization degree) can be manufactured. It should be noted that, when the underwater stretching treatment and the aerial stretching treatment are combined, the aerial stretching treatment may be an aerial stretching treatment of the above-mentioned layered product.
作為積層體的拉伸方向，可以選擇任意的適當方向。在1個實施方式中，沿著長條狀的積層體的長度方向進行拉伸。具體而言，沿長度方向輸送積層體，積層體的拉 伸方向是其輸送方向(MD)。在其他的實施方式中，沿長條狀的積層體的寬度方向進行拉伸。具體而言，沿長度方向輸送積層體，積層體的拉伸方向是與其輸送方向(MD)垂直的方向(TD)。 As the stretching direction of the laminated body, any appropriate direction can be selected. In one embodiment, stretching is performed along the longitudinal direction of the long laminated body. Specifically, the laminated body is conveyed in the longitudinal direction, and the pulling of the laminated body is performed. The extension direction is its conveying direction (MD). In another embodiment, stretching is performed in the width direction of the long laminated body. Specifically, the laminated body is conveyed in the longitudinal direction, and the stretching direction of the laminated body is a direction (TD) perpendicular to its conveying direction (MD).
積層體的拉伸溫度可根據樹脂基材的形成材料、拉伸方式等設定為任意的適當的值。在採用空中拉伸方式的情況下，拉伸溫度較佳為樹脂基材的玻璃化轉變溫度(Tg)以上，更佳為樹脂基材的玻璃化轉變溫度(Tg)+10℃以上，特佳為Tg+15℃以上。另一方面，積層體的拉伸溫度較佳為170℃以下。藉由在這樣的溫度下拉伸，能夠抑制PVA系樹脂的結晶化急速地進行，從而抑制因該結晶化而引起的不良情況(例如，妨礙由拉伸帶來的PVA系樹脂膜的配向)。 The stretching temperature of the laminated body can be set to any appropriate value depending on the forming material of the resin substrate, the stretching method, and the like. In the case of an aerial stretching method, the stretching temperature is preferably at least the glass transition temperature (Tg) of the resin substrate, more preferably the glass transition temperature (Tg) of the resin substrate + 10 ° C or more, particularly preferably Tg + 15 ° C or more. On the other hand, the stretching temperature of the laminate is preferably 170 ° C or lower. By stretching at such a temperature, rapid crystallization of the PVA-based resin can be suppressed, thereby suppressing defects caused by the crystallization (for example, hindering the orientation of the PVA-based resin film by stretching). .
在採用水中拉伸方式作為拉伸方式的情況下，拉伸浴的液體溫度較佳為40℃~85℃，更佳為50℃~85℃。如果是這樣的溫度，則能夠抑制PVA系樹脂膜的溶解並高倍率地進行拉伸。具體而言，如上所述，從與PVA系樹脂膜的形成的關係來看，樹脂基材的玻璃化轉變溫度(Tg)較佳為60℃以上。在這種情況下，若拉伸溫度低於40℃，則即使考慮因水而引起的樹脂基材的可塑化，也有無法良好地拉伸的擔心。另一方面，若拉伸浴的溫度變得越高，則PVA系樹脂膜的溶解性變得越高，有不能得到優異的光學特性之虞。 When the underwater stretching method is adopted as the stretching method, the liquid temperature of the stretching bath is preferably 40 ° C to 85 ° C, and more preferably 50 ° C to 85 ° C. With such a temperature, it is possible to stretch the PVA-based resin film at a high magnification while suppressing the dissolution of the PVA-based resin film. Specifically, as described above, the glass transition temperature (Tg) of the resin substrate is preferably 60 ° C. or higher from the relationship with the formation of the PVA-based resin film. In this case, if the stretching temperature is lower than 40 ° C, there is a concern that the resin substrate cannot be stretched well even if plasticization of the resin substrate due to water is considered. On the other hand, as the temperature of the stretching bath becomes higher, the solubility of the PVA-based resin film becomes higher, and there is a possibility that excellent optical characteristics cannot be obtained.
在採用水中拉伸方式的情況下，較佳使積層體浸 漬在硼酸水溶液中進行拉伸(硼酸水中拉伸)。藉由使用硼酸水溶液作為拉伸浴，能夠對PVA系樹脂膜賦予耐受拉伸時所施加的張力的剛性及不溶解於水的耐水性。具體而言，硼酸在水溶液中生成四羥基硼酸陰離子，並可藉由氫鍵與PVA系樹脂交聯。其結果，對PVA系樹脂膜賦予剛性及耐水性，能夠良好地進行拉伸，能夠製作具有優異的光學特性的偏光膜。 In the case of underwater stretching, it is preferable to immerse the laminated body The stain is stretched in an aqueous solution of boric acid (stretching in boric acid). By using a boric acid aqueous solution as a stretching bath, the PVA-based resin film can be provided with rigidity to withstand the tension applied during stretching and water resistance insoluble in water. Specifically, boric acid generates a tetrahydroxyborate anion in an aqueous solution, and can be crosslinked with a PVA-based resin through hydrogen bonding. As a result, the PVA-based resin film is provided with rigidity and water resistance, can be stretched well, and a polarizing film having excellent optical characteristics can be produced.
上述硼酸水溶液較佳藉由使硼酸及/或硼酸鹽溶解於作為溶劑的水而得到。硼酸濃度相對於水100重量份較佳為1重量份~10重量份。藉由將硼酸濃度設定為1重量份以上，能夠有效地抑制PVA系樹脂膜的溶解，能夠製作更高特性的偏光膜。需要說明的是，除了硼酸或硼酸鹽以外，也可以使用硼砂等硼化合物、乙二醛、戊二醛等溶解於溶劑而得到的水溶液。 The aqueous boric acid solution is preferably obtained by dissolving boric acid and / or a borate in water as a solvent. The boric acid concentration is preferably 1 to 10 parts by weight based on 100 parts by weight of water. By setting the boric acid concentration to 1 part by weight or more, the dissolution of the PVA-based resin film can be effectively suppressed, and a polarizing film with higher characteristics can be produced. In addition to the boric acid or borate, an aqueous solution obtained by dissolving a boron compound such as borax, glyoxal, and glutaraldehyde in a solvent may be used.
較佳在上述拉伸浴(硼酸水溶液)中配混碘化物。藉由配混碘化物，能夠抑制吸附於PVA系樹脂膜的碘的溶出。碘化物的具體例如上述所述。碘化物的濃度相對於水100重量份較佳為0.05重量份~15重量份，更佳為0.5重量份~8重量份。 The iodide is preferably blended in the stretching bath (aqueous boric acid solution). By blending iodide, elution of iodine adsorbed on the PVA-based resin film can be suppressed. Specific examples of the iodide are as described above. The concentration of the iodide is preferably 0.05 to 15 parts by weight, and more preferably 0.5 to 8 parts by weight with respect to 100 parts by weight of water.
積層體在拉伸浴中的浸漬時間較佳為15秒~5分鐘。積層體的基於水中拉伸方式的拉伸倍率例如為2倍以上。需要說明的是，水中拉伸處理較佳在染色處理之後進行。 The immersion time of the laminated body in the stretching bath is preferably 15 seconds to 5 minutes. The stretching ratio of the laminated body by the underwater stretching method is, for example, 2 times or more. It should be noted that the underwater stretching treatment is preferably performed after the dyeing treatment.
(不溶化處理) (Insolubilization treatment)
上述不溶化處理代表性的是藉由使PVA系樹脂膜浸漬在硼酸水溶液中來進行。特別是在採用水中拉伸方式的情況下，藉由實施不溶化處理，能夠對PVA系樹脂膜賦予耐水性。該硼酸水溶液的濃度相對於水100重量份較佳為1重量份~4重量份。不溶化浴(硼酸水溶液)的液體溫度較佳為20℃~40℃。不溶化處理較佳在染色處理、水中拉伸處理之間進行。 The insolubilization process is typically performed by immersing a PVA-based resin film in an aqueous boric acid solution. In particular, when the underwater stretching method is used, water resistance can be imparted to the PVA-based resin film by performing an insolubilization treatment. The concentration of the boric acid aqueous solution is preferably 1 to 4 parts by weight based on 100 parts by weight of water. The liquid temperature of the insolubilization bath (aqueous boric acid solution) is preferably 20 ° C to 40 ° C. The insolubilization treatment is preferably performed between a dyeing treatment and an underwater stretching treatment.
(交聯處理) (Cross-linking treatment)
上述交聯處理代表性的是藉由使PVA系樹脂膜浸漬在硼酸水溶液中來進行。藉由實施交聯處理，能夠對PVA系樹脂膜賦予耐水性。該硼酸水溶液的濃度相對於水100重量份較佳為1重量份~4重量份。另外，在上述染色處理後進行交聯處理的情況下，較佳進一步配混碘化物。藉由配混碘化物，能夠抑制吸附於PVA系樹脂膜的碘的溶出。碘化物的配混量相對於水100重量份較佳為1重量份~5重量份。碘化物的具體例如上述所述。交聯浴(硼酸水溶液)的液體溫度較佳為20℃~50℃。較佳交聯處理在水中拉伸處理之前進行。在較佳的實施方式中，依序進行染色處理、交聯處理及水中拉伸處理。 The above-mentioned crosslinking treatment is typically performed by immersing a PVA-based resin film in an aqueous boric acid solution. By carrying out the crosslinking treatment, water resistance can be imparted to the PVA-based resin film. The concentration of the boric acid aqueous solution is preferably 1 to 4 parts by weight based on 100 parts by weight of water. Moreover, when performing a crosslinking process after the said dyeing process, it is preferable to mix | blend an iodide further. By blending iodide, elution of iodine adsorbed on the PVA-based resin film can be suppressed. The compounding quantity of an iodide is 1 weight part-5 weight part with respect to 100 weight part of water. Specific examples of the iodide are as described above. The liquid temperature of the crosslinking bath (aqueous boric acid solution) is preferably 20 ° C to 50 ° C. The crosslinking treatment is preferably performed before the water stretching treatment. In a preferred embodiment, a dyeing treatment, a crosslinking treatment, and an underwater stretching treatment are sequentially performed.
(清洗處理) (Cleaning treatment)
上述清洗處理代表性的是藉由使PVA系樹脂膜浸漬在碘化鉀水溶液中來進行。 The cleaning treatment is typically performed by immersing a PVA-based resin film in an aqueous potassium iodide solution.
(乾燥處理) (Drying)
乾燥處理的乾燥溫度較佳為30℃~100℃。 The drying temperature of the drying treatment is preferably 30 ° C to 100 ° C.
得到的偏光膜實質上是吸附配向有二色性物質的PVA系樹脂膜。偏光膜的厚度較佳為10μm以下，更佳為7μm以下，特佳為5μm以下。另一方面，偏光膜的厚度較佳為0.5μm以上，更佳為1.0μm以上。 The obtained polarizing film is substantially a PVA-based resin film that adsorbs and aligns a dichroic substance. The thickness of the polarizing film is preferably 10 μm or less, more preferably 7 μm or less, and particularly preferably 5 μm or less. On the other hand, the thickness of the polarizing film is preferably 0.5 μm or more, and more preferably 1.0 μm or more.
偏光膜較佳在波長380nm~780nm中的任意波長下顯示吸收二色性。偏光膜的單體透過率較佳為40.0%以上，更佳為41.0%以上，進一步更佳為42.0%以上，特佳為43.0%以上。偏光膜的偏光度較佳為99.8%以上，更佳為99.9%以上，進一步更佳為99.95%以上。 The polarizing film preferably exhibits absorption dichroism at any wavelength from 380 nm to 780 nm. The monomer transmittance of the polarizing film is preferably 40.0% or more, more preferably 41.0% or more, even more preferably 42.0% or more, and particularly preferably 43.0% or more. The degree of polarization of the polarizing film is preferably 99.8% or more, more preferably 99.9% or more, and still more preferably 99.95% or more.
C.偏光板 C. Polarizer
本發明的偏光板具有上述偏光膜。較佳偏光板具有上述偏光膜及配置在該偏光膜的至少單側的保護薄膜。作為該保護薄膜，可以直接使用上述樹脂基材，也可以使用與上述樹脂基材不同的薄膜。作為保護薄膜的形成材料，例如，可以舉出(甲基)丙烯酸系樹脂、二乙醯基纖維素、三乙醯基纖維素等纖維素系樹脂；環烯烴系樹脂、聚丙烯等烯烴系樹脂；聚對苯二甲酸乙二醇酯系樹脂等酯系樹脂；聚醯胺系樹脂；聚碳酸酯系樹脂；其等的共聚物樹脂等。保護薄膜的厚度較佳為10μm~100μm。 The polarizing plate of the present invention includes the above-mentioned polarizing film. Preferably, the polarizing plate includes the polarizing film and a protective film disposed on at least one side of the polarizing film. As the protective film, the above-mentioned resin substrate may be directly used, or a film different from the above-mentioned resin substrate may be used. Examples of the material for forming the protective film include cellulose resins such as (meth) acrylic resins, diethyl cellulose, and triethyl cellulose; olefin resins such as cycloolefin resins and polypropylene ; Ester-based resins such as polyethylene terephthalate-based resins; Polyamine-based resins; Polycarbonate-based resins; Copolymer resins and the like. The thickness of the protective film is preferably 10 μm to 100 μm.
在1個實施方式中，將上述樹脂基材從偏光膜剝離並積層另一薄膜。保護薄膜可以借助黏接層積層在偏光膜上，也可以使其等密合(不透過黏接層)而積層。黏接層代表性的是用黏接劑或黏合劑形成的。 In one embodiment, the resin substrate is peeled from the polarizing film and another film is laminated. The protective film may be laminated on the polarizing film by means of an adhesive layer, or may be laminated in such a manner as to be in close contact (without passing through the adhesive layer). The adhesive layer is typically formed using an adhesive or an adhesive.
以下，藉由實施例具體地說明本發明，但本發明不受這些實施例限定。需要說明的是，樹脂基材的厚度的偏差及滾花的平均高度的測定方法如下所述。 Hereinafter, the present invention will be specifically described by examples, but the present invention is not limited to these examples. In addition, the measurement method of the dispersion | variation in the thickness of a resin base material and the average height of a knurling is as follows.
用接觸式臺式離線厚度測量裝置(YAMABUNTOF-5R、山文電氣股份有限公司製)，在樹脂基材的寬度方向以5mm間距測定厚度，評價樹脂基材在整個寬度方向及在30mm寬度的厚度的偏差。 The thickness was measured at a pitch of 5 mm in the width direction of the resin substrate using a contact-type bench-top offline thickness measuring device (YAMABUNTOF-5R, manufactured by Shanwen Electric Co., Ltd.), and the thickness of the resin substrate in the entire width direction and 30 mm width was evaluated The deviation.
用薄膜厚度測定機(Mahr股份有限公司製)對滾花形成部分以1cm的間距測定10個點，算出所得到的測定值的平均值。 The knurling portion was measured at 10 points at a pitch of 1 cm with a film thickness measuring machine (manufactured by Mahr Co., Ltd.), and the average value of the obtained measured values was calculated.
[實施例1] [Example 1]
對由吸水率為0.75%、Tg為75℃的非晶質的間苯二甲酸共聚聚對苯二甲酸乙二醇酯(IPA共聚PET)構成的、長條狀且厚度為100μm的樹脂基材的單面實施電暈處理。在將以9：1的比例含有聚乙烯醇(聚合度4200、皂化度99.2莫耳%)及乙醯乙醯基改性PVA(聚合度1200、乙醯乙醯基改性度4.6%、皂化度99.0莫耳%以上、日本合成化學工業股份有限公司製、商品名“Gohsefimer Z-200”)的水溶液在25℃下塗布到該電暈處理面之後，在60℃下乾燥200秒鐘，形成了厚度為10μm的PVA系樹脂膜。將這樣操作而得到的積層物在115℃的烘箱內、在圓周速度不同的輥間沿長度方向進行 自由端單軸拉伸(空中拉伸)為2.0倍。 100 μm thick resin substrate consisting of amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) with a water absorption of 0.75% and a Tg of 75 ° C Corona treatment on one side. Polyvinyl alcohol (degree of polymerization 4200, saponification degree 99.2 mole%) and acetamidine modified PVA (polymerization degree 1200, acetamidine modification degree 4.6%, saponification) are contained in a ratio of 9: 1 An aqueous solution having a degree of 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd. under the trade name "Gohsefimer Z-200") was applied to the corona-treated surface at 25 ° C, and then dried at 60 ° C for 200 seconds to form A PVA-based resin film having a thickness of 10 μm was used. The laminate obtained in this way was carried out in an oven at 115 ° C in the longitudinal direction between rollers having different peripheral speeds. The free end uniaxial stretching (air stretching) was 2.0 times.
然後，分別在積層物的寬度方向兩端部(在距離樹脂基材的端邊5mm~7mm的位置)，如圖2所示地用滾花形成輥對形成如圖1所示的滾花，得到積層體。形成的滾花距離樹脂基材面的平均高度為9.12μm。 Then, at the two ends in the width direction of the laminate (at a position 5 mm to 7 mm from the end of the resin substrate), as shown in FIG. 2, a knurling roller pair is formed as shown in FIG. 1. A laminated body was obtained. The average height of the formed knurls from the resin substrate surface was 9.12 μm.
[實施例2] [Example 2]
除了形成距離樹脂基材面的平均高度為6.74μm的滾花以外，與實施例1同樣地操作，得到積層體。 A laminated body was obtained in the same manner as in Example 1 except that a knurling having an average height of 6.74 μm from the resin substrate surface was formed.
[實施例3] [Example 3]
除了形成距離樹脂基材面的平均高度為12.59μm的滾花以外，與實施例1同樣地操作，得到積層體。 A laminated body was obtained in the same manner as in Example 1 except that a knurling having an average height of 12.59 μm from the resin substrate surface was formed.
[實施例4] [Example 4]
除了形成距離樹脂基材面的平均高度為4.11μm的滾花以外，與實施例1同樣地操作，得到積層體。 A laminated body was obtained in the same manner as in Example 1 except that a knurling having an average height of 4.11 μm from the resin substrate surface was formed.
[實施例5] [Example 5]
除了形成距離樹脂基材面的平均高度為15.87μm的滾花以外，與實施例1同樣地操作，得到積層體。 A laminated body was obtained in the same manner as in Example 1 except that a knurling having an average height of 15.87 μm from the resin substrate surface was formed.
[比較例1] [Comparative Example 1]
除了不形成滾花以外，與實施例1同樣地操作，得到積層體。 A laminated body was obtained in the same manner as in Example 1 except that knurling was not formed.
(評價) (Evaluation)
對各實施例及比較例的積層體評價因捲取而造成的影響。評價方法如下，將評價結果示於表1。 The laminated body of each Example and the comparative example evaluated the influence by winding. The evaluation method is as follows. The evaluation results are shown in Table 1.
用張力450N將得到的積層體以PVA系樹脂膜為內側的方式沿長度方向捲取3100m~3500m，製成積層體捲，藉由目視觀察剛捲取後及捲取後經過10天後的積層體捲的狀態。 Using a tension of 450N, the obtained laminated body was wound in the length direction from 3100m to 3500m with the PVA-based resin film as the inner side to make a laminated body roll. The laminated body immediately after winding and after 10 days after winding were visually observed. The status of the volume.
在實施例5中，在剛捲取後、捲取10天後都沒有確認到捲緊，但剛捲取後在積層體捲的中央附近確認到彎曲，10天後該彎曲惡化。 In Example 5, the tightness was not confirmed immediately after the winding up and after 10 days of winding up, but the bending was confirmed near the center of the laminated body roll immediately after the winding up, and the bending deteriorated after 10 days.
本發明的偏光膜適用於例如影像顯示裝置。具體而言，可適當地用作液晶電視、液晶顯示器、行動電話、數位相機、攝影機、可擕式遊戲機、導航、影印機、印表機、傳真機、鐘錶、微波爐等的液晶板；有機EL裝置的反射防止板等。 The polarizing film of the present invention is suitable for, for example, an image display device. Specifically, it can be suitably used as a liquid crystal panel for a liquid crystal television, a liquid crystal display, a mobile phone, a digital camera, a video camera, a portable game machine, navigation, a photocopier, a printer, a facsimile, a clock, a microwave oven, and the like; organic Anti-reflection plate of the EL device and the like.
Claims (8)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-250624 | 2014-12-11 | ||
| JP2014250624A JP6376597B2 (en) | 2014-12-11 | 2014-12-11 | Laminate for manufacturing polarizing film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201622975A TW201622975A (en) | 2016-07-01 |
| TWI666117B true TWI666117B (en) | 2019-07-21 |
Family
ID=56139975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW104136483A TWI666117B (en) | 2014-12-11 | 2015-11-05 | Laminated body for manufacturing polarizing film, and manufacturing method of polarizing film |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6376597B2 (en) |
| KR (2) | KR20160071332A (en) |
| CN (1) | CN105700057B (en) |
| TW (1) | TWI666117B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021115861A (en) * | 2020-01-29 | 2021-08-10 | 住友化学株式会社 | Film roll |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201239420A (en) * | 2010-11-05 | 2012-10-01 | Konica Minolta Opto Inc | Optical film and process for production thereof |
| WO2013115178A1 (en) * | 2012-01-30 | 2013-08-08 | コニカミノルタ株式会社 | Polarizing plate and display device using same |
| WO2014091921A1 (en) * | 2012-12-13 | 2014-06-19 | コニカミノルタ株式会社 | Optical film roll, method for producing same, polarizing plate, and display device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4279944B2 (en) | 1999-06-01 | 2009-06-17 | 株式会社サンリッツ | Manufacturing method of polarizing plate |
| JP2003147092A (en) * | 2001-11-16 | 2003-05-21 | Fuji Photo Film Co Ltd | Film roll and method for winding film |
| JP2004042653A (en) * | 2002-07-12 | 2004-02-12 | Nitto Denko Corp | Hard coat film |
| JP4747985B2 (en) * | 2006-08-02 | 2011-08-17 | コニカミノルタオプト株式会社 | Optical film, polarizing plate and liquid crystal display device using the same |
| KR20120070566A (en) * | 2009-09-14 | 2012-06-29 | 코니카 미놀타 어드밴스드 레이어즈 인코포레이티드 | Method of manufacturing optical film, optical film, deflection plate, and liquid crystal display device |
| JP5480088B2 (en) * | 2010-09-27 | 2014-04-23 | 古河電気工業株式会社 | Manufacturing method of reflective substrate |
| JP5889158B2 (en) * | 2012-10-04 | 2016-03-22 | 日東電工株式会社 | Method for producing stretched laminate |
| JP6044304B2 (en) * | 2012-11-30 | 2016-12-14 | 日本ゼオン株式会社 | Winding body of thermoplastic resin film and method for producing the same |
| JP5613276B2 (en) * | 2013-03-01 | 2014-10-22 | 日東電工株式会社 | Laminated body |
| JP6285176B2 (en) * | 2013-12-25 | 2018-02-28 | 日東電工株式会社 | Method for producing optical laminate |
-
2014
- 2014-12-11 JP JP2014250624A patent/JP6376597B2/en active Active
-
2015
- 2015-11-05 TW TW104136483A patent/TWI666117B/en active
- 2015-12-09 KR KR1020150175282A patent/KR20160071332A/en not_active Application Discontinuation
- 2015-12-11 CN CN201510920758.1A patent/CN105700057B/en active Active
-
2021
- 2021-12-03 KR KR1020210171961A patent/KR102577828B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201239420A (en) * | 2010-11-05 | 2012-10-01 | Konica Minolta Opto Inc | Optical film and process for production thereof |
| WO2013115178A1 (en) * | 2012-01-30 | 2013-08-08 | コニカミノルタ株式会社 | Polarizing plate and display device using same |
| WO2014091921A1 (en) * | 2012-12-13 | 2014-06-19 | コニカミノルタ株式会社 | Optical film roll, method for producing same, polarizing plate, and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105700057B (en) | 2020-12-29 |
| TW201622975A (en) | 2016-07-01 |
| KR102577828B1 (en) | 2023-09-12 |
| JP6376597B2 (en) | 2018-08-22 |
| CN105700057A (en) | 2016-06-22 |
| KR20210151754A (en) | 2021-12-14 |
| KR20160071332A (en) | 2016-06-21 |
| JP2016114634A (en) | 2016-06-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5616318B2 (en) | Manufacturing method of polarizing film | |
| US9701074B2 (en) | Method of manufacturing polarizing plate | |
| US9046655B2 (en) | Method of manufacturing polarizing plate | |
| JP6525587B2 (en) | Method of manufacturing polarizing plate | |
| CN106537196B (en) | Method for producing laminate | |
| KR102577828B1 (en) | Laminate for producing polarizing film | |
| TWI716454B (en) | Polarizer and manufacturing method thereof | |
| TWI570462B (en) | Manufacturing method of optical laminated body | |
| JP6357069B2 (en) | Manufacturing method of laminate | |
| KR102496756B1 (en) | Method of manufacturing polarizing plate | |
| JP6050881B2 (en) | Manufacturing method of laminate | |
| JP6410503B2 (en) | Manufacturing method of laminate | |
| JP6656444B2 (en) | Manufacturing method of polarizing plate | |
| TWI682199B (en) | Method for manufacturing polarizing plate | |
| JP2018124579A (en) | Laminate for producing polarizing film | |
| JP2016078219A (en) | Manufacturing method of resin film |