TW202026378A - Adhesive sheet for backlight attachment and backlight unit capable of having better display quality with reduced losses of light reflection - Google Patents
Adhesive sheet for backlight attachment and backlight unit capable of having better display quality with reduced losses of light reflection Download PDFInfo
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- TW202026378A TW202026378A TW108137021A TW108137021A TW202026378A TW 202026378 A TW202026378 A TW 202026378A TW 108137021 A TW108137021 A TW 108137021A TW 108137021 A TW108137021 A TW 108137021A TW 202026378 A TW202026378 A TW 202026378A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/24—Homopolymers or copolymers of amides or imides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/062—Copolymers with monomers not covered by C09J133/06
- C09J133/064—Copolymers with monomers not covered by C09J133/06 containing anhydride, COOH or COOM groups, with M being metal or onium-cation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
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- 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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Organic Chemistry (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
- Liquid Crystal (AREA)
- Securing Globes, Refractors, Reflectors Or The Like (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
本發明關於,在具有由液晶面板及各種光學構件等所構成的顯示部以及照射該顯示部的背光之顯示裝置等,貼附於背光的背光貼附用黏著片,以及在如此的背光貼附有黏著劑層的背光單元。The present invention relates to an adhesive sheet for backlight sticking attached to a backlight in a display device having a display portion composed of a liquid crystal panel and various optical members, and a backlight that illuminates the display portion, and the backlight sticking on such a backlight Backlight unit with adhesive layer.
近年來在行動電話、智慧型手機、平板電腦、遊戲機等的電子機器,多使用液晶顯示裝置作為顯示器(display)。由液晶面板等所構成的顯示部,由於其本身不發光,所以顯示裝置具有顯示部及照射該顯示部的背光而構成。In recent years, in electronic devices such as mobile phones, smart phones, tablet computers, and game consoles, liquid crystal display devices are often used as displays. Since the display portion composed of a liquid crystal panel or the like does not emit light by itself, the display device has a display portion and a backlight that illuminates the display portion.
在顯示裝置的背光的光源的配置方式,有在導光板的側部配置光源的側光型,和在顯示部的正後方配置光源的直下型。從畫面的亮度及對比的觀點,直下型的背光已成為主流。直下型的背光中、由於獲得光量且使光均勻,因此將多數的發光體,典型為發光二極體(LED),設置在基板上。In the arrangement of the light source of the backlight of the display device, there are a side light type in which the light source is arranged on the side of the light guide plate, and a direct type in which the light source is arranged directly behind the display unit. From the viewpoint of screen brightness and contrast, direct-type backlights have become mainstream. In a direct type backlight, since the amount of light is obtained and the light is uniform, a large number of light-emitting bodies, typically light-emitting diodes (LEDs), are provided on a substrate.
在此,顯示裝置通常經由黏著片使顯示部及背光貼合而固定。如此的黏著片例如專利文獻1及2所揭示者。如此的黏著片具有平視框狀的形狀,使顯示部及背光在該等的邊緣部貼合。因此,框狀的黏著片的內側形成空隙,存在空氣層。
[先前專利文獻]
[專利文獻]Here, the display device is usually fixed by bonding the display portion and the backlight through an adhesive sheet. Such an adhesive sheet is disclosed in
[專利文獻1] 日本特許5192682號公報 [專利文獻2] 日本特開2007-059386號公報[Patent Document 1] Japanese Patent No. 5192682 [Patent Document 2] JP 2007-059386 A
[發明所欲解決之問題][The problem to be solved by the invention]
然而,一旦如上述顯示裝置的內部存在空氣層,則該空氣層和其鄰接的層的折射率差導致光的反射損失變大,有顯示裝置的畫質降低的問題。However, if an air layer exists inside the display device as described above, the difference in refractive index between the air layer and the adjacent layer causes the reflection loss of light to increase, and there is a problem that the image quality of the display device decreases.
為了解決上述問題,考量在背光的全表面貼附黏著片,但是如前所述,在背光的基板上設有多數的LED。習知,對於如此的背光的全表面,不存在有可無空隙貼附的黏著片。例如,專利文獻1及2所揭示之黏著片,有在作為框狀部分的使用具有規定的性能者,但是沒有對多數的LED直接且無空隙貼附的充分性能者。In order to solve the above problems, it is considered to stick an adhesive sheet on the entire surface of the backlight. However, as mentioned above, a large number of LEDs are provided on the substrate of the backlight. Conventionally, for the entire surface of such a backlight, there is no adhesive sheet that can be attached without a gap. For example, the pressure-sensitive adhesive sheets disclosed in
另一方面,也考量不使用黏著片,在背光的全表面塗佈黏著劑形成黏著劑層,但是有生產性差的問題。On the other hand, it is considered that the adhesive is not used and the adhesive is coated on the entire surface of the backlight to form an adhesive layer, but there is a problem of poor productivity.
本發明係鑑於上述實際狀況所產生,以提供背光貼附用黏著片,其貼附在基板上設有複數個發光體的背光以無空隙封裝該發光體,及如此的背光貼附用黏著片貼附背光而成的背光單元為目的。 [解決問題之技術手段]In view of the above-mentioned actual situation, the present invention provides an adhesive sheet for backlight attachment, which is attached to a backlight provided with a plurality of luminous bodies on a substrate to encapsulate the luminous body without voids, and such an adhesive sheet for backlight attachment The purpose of the backlight unit is to attach the backlight. [Technical means to solve the problem]
為了達成上述目的,第1,本發明提供一種背光貼附用黏著片,其為具有黏著劑層之黏著片,該黏著劑層貼附在基板上設有複數個發光體的背光以封裝該發光體,其特徵在於,該黏著劑層在50℃的儲存模數為0.001 MPa 以上、0.15 MPa以下,構成該黏著劑層的黏著劑的凝膠分率為10%以上、75%以下,上述黏著劑層的厚度為110μm以上 (發明1)。In order to achieve the above object, firstly, the present invention provides an adhesive sheet for attaching a backlight, which is an adhesive sheet with an adhesive layer attached to a substrate with a backlight provided with a plurality of luminous bodies to encapsulate the light-emitting Body, characterized in that the storage modulus of the adhesive layer at 50°C is 0.001 MPa or more and 0.15 MPa or less, and the gel fraction of the adhesive constituting the adhesive layer is 10% or more and 75% or less, and the adhesive The thickness of the agent layer is 110 μm or more (Invention 1).
根據上述發明(發明1),黏著劑層具有上述物性,在基板上設有複數個發光體的背光,能夠以無空隙封裝該發光體地貼附黏著劑層。According to the above-mentioned invention (Invention 1), the adhesive layer has the above-mentioned physical properties, a backlight having a plurality of luminous bodies is provided on a substrate, and the adhesive layer can be attached without voids to encapsulate the luminous bodies.
在上述發明(發明1),上述黏著劑層在23℃的儲存模數為0.01 MPa 以上、0.20 MPa以下為佳(發明2)。In the above invention (Invention 1), it is preferable that the storage modulus of the adhesive layer at 23° C. is 0.01 MPa or more and 0.20 MPa or less (Invention 2).
在上述發明(發明1、2),上述黏著劑為丙烯酸類黏著劑為佳(發明3)。In the above inventions (
在上述發明(發明1~3),以具有2片剝離片,及和上述2片剝離片的剝離面相接、被上述剝離片夾住的上述黏著劑層為佳(發明4)。In the above inventions (
第2,本發明提供一種背光單元,其為具有在1或2個以上的基板上設有複數個發光體的背光,以及貼附於上述背光以封裝該發光體之黏著劑層的背光單元,其特徵在於,該黏著劑層為上述背光貼附用黏著片(發明1~4)之黏著劑層(發明5)。Secondly, the present invention provides a backlight unit, which is a backlight with a plurality of luminous bodies on one or more substrates, and a backlight unit with an adhesive layer attached to the backlight to encapsulate the luminous bodies, It is characterized in that the adhesive layer is the adhesive layer (Invention 5) of the aforementioned adhesive sheet for backlight pasting (
在上述發明(發明5),上述發光體為發光二極體為佳(發明6)。 [發明效果]In the aforementioned invention (Invention 5), it is preferable that the aforementioned luminous body is a light emitting diode (Invention 6). [Invention Effect]
本發明所述之背光貼附用黏著片,可貼附在基板上設有複數個發光體的背光,以無空隙封裝該發光體。又本發明所述之背光單元,基板上的複數個發光體以無空隙封裝地將黏著劑層貼附於背光,所以可抑制所得的顯示器的畫質降低。The adhesive sheet for attaching the backlight of the present invention can be attached to a backlight provided with a plurality of luminous bodies on a substrate, so as to encapsulate the luminous bodies without gaps. In addition, in the backlight unit of the present invention, the plurality of light-emitting bodies on the substrate are encapsulated with an adhesive layer to the backlight without voids, so that the image quality of the resulting display can be prevented from degrading.
[為實施發明之態樣][For the implementation of the invention]
以下對於本發明之實施態樣進行說明。 [背光貼附用黏著片] 本發明之一實施態樣之背光貼附用黏著片(本說明書中有只稱為「黏著片」的情形),具有黏著劑層貼附在基板上設有複數個發光體的背光以封裝該發光體,較佳為在該黏著劑層的一面或兩面積層剝離片而成。The following describes the implementation aspects of the present invention. [Adhesive sheet for backlight sticking] One embodiment of the present invention is an adhesive sheet for attaching a backlight (in this specification, it is only referred to as an "adhesive sheet"), which has an adhesive layer attached to a substrate and a backlight provided with a plurality of luminous bodies to encapsulate the The luminous body is preferably formed by peeling off the sheet on one or both sides of the adhesive layer.
本實施態樣之背光貼附用黏著片之一例的具體構成如第1圖所示。
如第1圖所示,背光貼附用黏著片(黏著片) 1是由2片的剝離片12a、12b及和這2片剝離片12a、12b的剝離面相接、被夾在這2片剝離片12a、12b之間的黏著劑層11所構成。又本說明書中之剝離片的剝離面是指在剝離片具有剝離性的面,也包含進行剝離處理的面及未進行剝離處理但顯示剝離性的面。The specific structure of an example of the adhesive sheet for backlight attachment of this embodiment is shown in FIG.
As shown in Figure 1, the adhesive sheet for backlight pasting (adhesive sheet) 1 is composed of two
1. 各元件
1-1. 黏著劑層
本實施態樣之黏著片1之黏著劑層11為,在50℃的儲存模數為0.001 MPa 以上、0.15 MPa以下,構成該黏著劑層11的黏著劑的凝膠分率為10%以上、75%以下,厚度為110μm以上者。1. Components
1-1. Adhesive layer
The
黏著劑層11為具有上述物性者,本實施態樣之黏著片1可使黏著劑層11貼附在基板上設有複數個發光體的背光以無空隙封裝該發光體。由此,在所得的顯示裝置等的顯示部和背光之間沒有空氣層或空隙,因此可防止因光反射損失所造成的畫質降低。The
具體地說,黏著劑層11在50℃的儲存模數為0.15 MPa以下,且構成該黏著劑層11的黏著劑的凝膠分率為75%以下,所以黏著劑層11發揮優良的柔軟性及應力緩和性,容易埋入發光體,又可無空隙封裝發光體。Specifically, the storage modulus of the
另一方面,設置於背光的複數個發光體,有因發光而發熱的情形,在設置多個發光體的情形,黏著劑層11會暴露於高溫條件(耐久條件)。黏著劑層11在50℃的儲存模數為0.001 MPa以上,且上述凝膠分率為10%以上,則即使在上述耐久條件下也能輕易維持因黏著劑層11的無空隙封裝。On the other hand, a plurality of luminous bodies provided in the backlight may generate heat due to light emission. When a plurality of luminous bodies are provided, the
從發光體埋入性的觀點,黏著劑層11在50℃的儲存模數為0.13MPa以下為佳,0.09 MPa以下特佳,0.05 MPa以下更佳。又,從在耐久條件下的發光體封裝性的觀點,上述儲存模數以0.01 MPa以上為佳,0.02 MPa以上特佳, 0.03 MPa以上更佳。From the viewpoint of embedding of the luminous body, the storage modulus of the
從發光體埋入性的觀點,構成該黏著劑層11的黏著劑的凝膠分率以70%以下為佳,特別以64%以下為佳,更以57%以下為佳。又,從在耐久條件下的發光體封裝性的觀點,上述凝膠分率以20%以上為佳,30%以上較佳,40%以上特佳,50%以上更佳。From the viewpoint of embedding of the light-emitting body, the gel fraction of the adhesive constituting the
另一方面,黏著劑層11在23℃的儲存模數,從發光體埋入性的觀點,以0.20 MPa以下為佳,0.18 MPa以下較佳,0.15 MPa以下特佳,0.11 MPa以下特佳。又,從在耐久條件下的發光體封裝性的觀點,上述儲存模數以0.01 MPa以上為佳, 0.02 MPa以上特佳,0.04 MPa以上更佳。On the other hand, the storage modulus of the
本說明書中的儲存模數是根據JIS K7244-6,在測量頻率1Hz經扭轉剪切試驗所測量的值。又本說明書中黏著劑的凝膠分率的測量方法,如後述試驗例所示。The storage modulus in this manual is the value measured by the torsion shear test at a measuring frequency of 1 Hz according to JIS K7244-6. In addition, the method of measuring the gel fraction of the adhesive in this specification is as shown in the test example described later.
黏著劑層11由於具有上述儲存模數及凝膠分率,以及厚度為110μm以上,所以可根據發光體的種類而封裝該發光體。從發光體封裝的觀點,黏著劑層11的厚度以130μm以上為佳,160μm以上特佳,200μm以上更佳。另一方面,從所得的顯示器薄型化的觀點,黏著劑層11的厚度以1000μm以下為佳,800μm以下特佳,500μm以下更佳。Since the
又,黏著劑層11的厚度相對於發光體的厚度之比例(黏著劑層的厚度∕發光體的厚度),從確實封裝發光體的觀點,以1.1以上為佳,1.4以上較佳,2.0以上特佳,2.2以上更佳。另一方面,上述的厚度比例,從所得的顯示器薄型化的觀點,以10以下為佳,8以下較佳,5以下特佳,2.9以下更佳。In addition, the ratio of the thickness of the
本實施態樣之構成黏著片1的黏著劑層11的黏著劑的種類,只要滿足前述物性值沒有特別限定,可為例如丙烯酸類黏著劑、聚酯類黏著劑、聚氨酯類黏著劑、橡膠類黏著劑、聚矽氧類黏著劑等之任一種。又,該黏著劑也可為乳劑型、溶劑型或無溶劑型任一種,也可為交聯型或非交聯型任一種。這些之中,以容易滿足前述物性值的丙烯酸類黏著劑為佳。The type of adhesive that constitutes the
又,丙烯酸類黏著劑可以是活性能量線硬化性,也可以是活性能量線非硬化性,但以不需要光聚合起始劑的活性能量線非硬化性的丙烯酸類黏著劑為佳。活性能量線非硬化性的丙烯酸類黏著劑特別以交聯型為佳,更以熱交聯型為佳。In addition, the acrylic adhesive may be active energy ray curable or active energy ray non-curable, but it is preferably an active energy ray non-curable acrylic adhesive that does not require a photopolymerization initiator. Active energy ray non-curable acrylic adhesives are particularly preferably cross-linked, and more preferably thermally cross-linked.
上述黏著劑特別以含有(甲基)丙烯酸酯聚合物(A)及交聯劑(B)的黏著性組合物(以下有稱為「黏著性組合物P」的情形)使其交聯而成者為佳。本說明書中,(甲基)丙烯酸表示丙烯酸及甲基丙烯酸兩者。其他類似用語也相同。又,「聚合物」也包含「共聚物」的概念。The above-mentioned adhesive is formed by cross-linking an adhesive composition (hereinafter referred to as "adhesive composition P") containing a (meth)acrylate polymer (A) and a cross-linking agent (B) The one is better. In this specification, (meth)acrylic acid means both acrylic acid and methacrylic acid. Other similar terms are also the same. In addition, "polymer" also includes the concept of "copolymer".
(1) 黏著劑組合物的成分 (1-1) (甲基)丙烯酸酯聚合物(A) 本實施態樣中(甲基)丙烯酸酯聚合物(A),以含有分子內具有和交聯劑(B)反應的反應性基的含反應性基單體做為構成該聚合物的單體單元者為佳。來自此含反應性基單體的反應性基和交聯劑(B)反應,形成交聯結構(三維網絡結構),容易獲得具有前述凝膠分率及儲存模數的黏著劑。(1) Ingredients of the adhesive composition (1-1) (Meth)acrylate polymer (A) In this embodiment, the (meth)acrylate polymer (A) uses a reactive group-containing monomer having a reactive group that reacts with the crosslinking agent (B) in the molecule as the monomer constituting the polymer The unit is better. The reactive groups from the reactive group-containing monomer react with the crosslinking agent (B) to form a crosslinked structure (three-dimensional network structure), and it is easy to obtain an adhesive having the aforementioned gel fraction and storage modulus.
上述含反應性基單體,較佳列舉例如分子內有羥基的單體(含羥基單體)、分子內有羧基的單體(含羧基單體)、分子內有胺基的單體(含胺基單體)等。這些之中,從維持低的儲存模數的觀點,以含羥基單體特佳。The above-mentioned reactive group-containing monomers preferably include monomers having a hydroxyl group in the molecule (hydroxyl-containing monomers), monomers having a carboxyl group in the molecule (carboxyl group-containing monomers), and monomers having an amine group in the molecule (containing Amino monomer) and so on. Among these, from the viewpoint of maintaining a low storage modulus, hydroxyl-containing monomers are particularly preferred.
含羥基單體,例如(甲基)丙烯酸2-羥基乙酯、(甲基)丙烯酸2-羥基丙酯、(甲基)丙烯酸3-羥基丙酯、(甲基)丙烯酸2-羥基丁酯、(甲基)丙烯酸3-羥基丁酯、(甲基)丙烯酸4-羥基丁酯等的(甲基)丙烯酸羥基烷基酯等。其中,從所得的(甲基)丙烯酸酯聚合物(A)中的羥基和交聯劑(B)的反應性及和其他單體的共聚合性的觀點,以具有碳數1~4的羥基烷基的(甲基)丙烯酸羥基烷基酯為佳。具體例如,(甲基)丙烯酸2-羥基乙酯、(甲基)丙烯酸4-羥基丁酯等為佳,特別以丙烯酸2-羥基乙酯或丙烯酸4-羥基丁酯為佳。這些可單獨使用,也可組合2種以上使用。Hydroxyl-containing monomers, such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, Hydroxyalkyl (meth)acrylates such as 3-hydroxybutyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate. Among them, from the viewpoint of the reactivity of the hydroxyl group in the obtained (meth)acrylate polymer (A) with the crosslinking agent (B) and the copolymerizability with other monomers, it is assumed that the hydroxyl group has a carbon number of 1 to 4 Hydroxyalkyl (meth)acrylates of alkyl groups are preferred. Specifically, 2-hydroxyethyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, etc. are preferred, and 2-hydroxyethyl acrylate or 4-hydroxybutyl acrylate is particularly preferred. These can be used individually or in combination of 2 or more types.
含羧基單體例如丙烯酸、甲基丙烯酸、巴豆酸(crotonic acid)、順丁烯二酸(maleic acid)、衣康酸(itaconic acid)、焦檸檬酸(citraconic acid)等的乙烯性不飽和羧酸。其中,從所得的(甲基)丙烯酸酯聚合物(A)中的羧基和交聯劑(B)的反應性及和其他單體的共聚合性的觀點,以丙烯酸為佳。這些可單獨使用,也可組合2種以上使用。Carboxyl group-containing monomers such as acrylic acid, methacrylic acid, crotonic acid (crotonic acid), maleic acid (maleic acid), itaconic acid (itaconic acid), citraconic acid (citraconic acid) and other ethylenically unsaturated carboxylic acids acid. Among them, acrylic acid is preferred from the viewpoint of the reactivity of the carboxyl group in the obtained (meth)acrylate polymer (A) and the crosslinking agent (B) and the copolymerization with other monomers. These can be used individually or in combination of 2 or more types.
含胺基單體,例如(甲基)丙烯酸胺基乙酯、(甲基)丙烯酸正丁基胺基乙酯等。這些可單獨使用,也可組合2種以上使用。Amino group-containing monomers, such as aminoethyl (meth)acrylate, n-butylaminoethyl (meth)acrylate, and the like. These can be used individually or in combination of 2 or more types.
(甲基)丙烯酸酯聚合物(A)以含有下限值3質量%以上的含反應性基單體做為構成該聚合物的單體單元者為佳,特別以含有10質量%以上為佳,更以含有15質量%以上為佳。(甲基)丙烯酸酯聚合物(A)以含有上限值35質量%以下的含反應性基單體做為構成該聚合物的單體單元者為佳,以含有30質量%以下較佳,特別以含有25質量%以下為佳。當(甲基)丙烯酸酯聚合物(A)含有上述量的含反應性基單體做為單體單元,容易得到前述的儲存模數及凝膠分率。The (meth)acrylate polymer (A) preferably contains a reactive group-containing monomer with a lower limit of 3% by mass or more as the monomer unit constituting the polymer, and particularly preferably contains 10% by mass or more , It is more preferable to contain 15% by mass or more. The (meth)acrylate polymer (A) preferably contains a reactive group-containing monomer having an upper limit of 35% by mass or less as the monomer unit constituting the polymer, and preferably contains 30% by mass or less, In particular, the content is preferably 25% by mass or less. When the (meth)acrylate polymer (A) contains the above-mentioned amount of reactive group-containing monomers as monomer units, it is easy to obtain the aforementioned storage modulus and gel fraction.
又,(甲基)丙烯酸酯聚合物(A)不含有含羧基單體做為構成該聚合物的單體單位也佳。因為羧基是酸成分,所以透過不含有含羧基單體,可抑制在黏著劑的貼附對象因酸產生的不良,例如在發光體的封裝樹脂、基板的金屬配線、基板上的金屬反射膜等存在的情形,也可抑制因酸產生的該等不良(劣化、腐蝕等)。但是,容許含有規定量的、不產生如此不良的程度的含羧基單體。具體為,容許(甲基)丙烯酸酯聚合物(A)中含有0.1質量%以下的含羧基單體做為單體單元,較佳容許含有0.01質量%以下,更佳容許含有0.001質量%以下的量。In addition, the (meth)acrylate polymer (A) preferably does not contain a carboxyl group-containing monomer as a monomer unit constituting the polymer. Since the carboxyl group is an acid component, it does not contain a carboxyl group-containing monomer to prevent defects caused by acid in the adhesive to be attached, such as the encapsulating resin of the light-emitting body, the metal wiring of the substrate, and the metal reflective film on the substrate. In some cases, such defects (deterioration, corrosion, etc.) due to acid can also be suppressed. However, it is allowed to contain a predetermined amount of a carboxyl group-containing monomer to such an extent that such a problem does not occur. Specifically, the (meth)acrylate polymer (A) is allowed to contain 0.1% by mass or less of carboxyl group-containing monomers as monomer units, preferably 0.01% by mass or less, and more preferably 0.001% by mass or less the amount.
(甲基)丙烯酸酯聚合物(A)以含有(甲基)丙烯酸烷基酯為構成該聚合物的單體單元者為佳。由此,可表現良好的黏著性。烷基也可為直鏈狀或支鏈狀。The (meth)acrylate polymer (A) preferably contains an alkyl (meth)acrylate as a monomer unit constituting the polymer. As a result, good adhesiveness can be expressed. The alkyl group may be linear or branched.
(甲基)丙烯酸烷基酯,從黏著性的觀點,以烷基的碳數為1~20的(甲基)丙烯酸烷基酯為佳。烷基的碳數為1~20的(甲基)丙烯酸烷基酯,例如(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丙酯、(甲基)丙烯酸正丁酯、(甲基)丙烯酸正戊酯、(甲基)丙烯酸正己酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸異辛酯、(甲基)丙烯酸正癸酯、(甲基)丙烯酸正十二烷酯、(甲基)丙烯酸十四烷酯、(甲基)丙烯酸十六烷酯、(甲基)丙烯酸十八烷酯等。其中,從更提高黏著性的觀點,以烷基的碳數為1~8的(甲基)丙烯酸酯為佳,以(甲基)丙烯酸甲酯、(甲基)丙烯酸正丁酯、或(甲基)丙烯酸2-乙基己酯特佳。又,這些可單獨使用,也可組合2種以上使用。The alkyl (meth)acrylate is preferably an alkyl (meth)acrylate having 1 to 20 carbon atoms in the alkyl group from the standpoint of adhesiveness. Alkyl (meth)acrylates whose alkyl group has 1 to 20 carbon atoms, such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, and normal (meth)acrylate Butyl ester, n-pentyl (meth)acrylate, n-hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, n-decyl (meth)acrylate, N-dodecyl (meth)acrylate, tetradecyl (meth)acrylate, cetyl (meth)acrylate, stearyl (meth)acrylate, etc. Among them, from the viewpoint of improving the adhesiveness, (meth)acrylates having an alkyl group of 1 to 8 carbon atoms are preferred, and methyl (meth)acrylate, n-butyl (meth)acrylate, or ( 2-ethylhexyl meth)acrylate is particularly preferred. Moreover, these may be used individually or in combination of 2 or more types.
(甲基)丙烯酸酯聚合物(A)以含有30質量%以上的(甲基)丙烯酸烷基酯為構成該聚合物的單體單元者為佳,含有40質量%以上較佳,含有50質量%以上特佳,含有55質量%以上更佳。當(甲基)丙烯酸烷基酯的含量的下限值為上述時,(甲基)丙烯酸酯聚合物(A)可發揮適宜的黏著性。又,(甲基)丙烯酸酯聚合物(A)以含有97質量%以下的(甲基)丙烯酸烷基酯為構成該聚合物的單體單元者為佳,含有90質量%以下較佳,含有80質量%以下特佳,含有70質量%以下更佳。當(甲基)丙烯酸烷基酯的含量的上限值為上述時,可在(甲基)丙烯酸酯聚合物(A)中導入適當量的含反應性官能基單體等的其他單體成分,容易調節前述的凝膠分率及儲存模數。The (meth)acrylate polymer (A) preferably contains 30% by mass or more of alkyl (meth)acrylate as the monomer unit constituting the polymer, preferably 40% by mass or more, and 50% by mass % Or more is particularly preferable, and it is more preferable to contain 55% by mass or more. When the lower limit of the content of the alkyl (meth)acrylate is the above, the (meth)acrylate polymer (A) can exhibit suitable adhesiveness. In addition, the (meth)acrylate polymer (A) preferably contains 97% by mass or less of alkyl (meth)acrylate as the monomer unit constituting the polymer, and preferably contains 90% by mass or less. 80% by mass or less is particularly preferred, and 70% by mass or less is more preferred. When the upper limit of the content of the alkyl (meth)acrylate is the above, an appropriate amount of other monomer components such as monomers containing reactive functional groups can be introduced into the (meth)acrylate polymer (A) , It is easy to adjust the aforementioned gel fraction and storage modulus.
上述(甲基)丙烯酸酯聚合物(A)含有分子內具有脂環結構的單體(含脂環結構單體)作為構成該聚合物的單體單元也佳。由於含脂環結構單體的體積大,使其存在聚合物中,推測使聚合物之間的間隔變大,可使所得的黏著劑的柔軟性優良。另一方面,含脂環結構單體本身可以提供聚合物某程度的硬度。因此,藉由(甲基)丙烯酸酯聚合物(A)具有含脂環結構單體做為構成單體單元,所得的黏著劑的凝膠分率及儲存模數、特別是在50℃的儲存模數,容易調整於前述的範圍內。The (meth)acrylate polymer (A) preferably contains a monomer having an alicyclic structure in the molecule (alicyclic structure-containing monomer) as a monomer unit constituting the polymer. Due to the large volume of the alicyclic structure-containing monomer, it exists in the polymer, and it is presumed that the gap between the polymers is increased, and the resulting adhesive can have excellent flexibility. On the other hand, the alicyclic structure-containing monomer itself can provide a certain degree of hardness of the polymer. Therefore, when the (meth)acrylate polymer (A) has an alicyclic structure-containing monomer as the constituent monomer unit, the gel fraction and storage modulus of the resulting adhesive, especially when stored at 50°C The modulus can be easily adjusted within the aforementioned range.
含脂環結構單體的脂環結構的碳環,可為飽和結構,也可具有一部分不飽和鍵者。脂環結構也可為單環的脂環結構,也可為二環、三環等的多環的脂環結構。同上所述,從調整所得的黏著劑的物性值的觀點,上述脂環結構以多環的脂環結構(多環結構)為佳。再者,考慮(甲基)丙烯酸酯聚合物(A)和其他成分的相溶性,上述多環結構以二環至四環特佳。又,同上所述,從調整所得的黏著劑的物性值的觀點,脂環結構的碳數(意指形成環的部分的全部碳數,在複數個環獨立存在的情形,表示其總計的碳數),以通常5以上為佳,7以上特佳。另一方面,脂環結構的碳數的上限沒有特別限制,從同上述的相溶性的觀點,以15以下為佳,10以下特佳。The carbocyclic ring of the alicyclic structure containing the alicyclic structure monomer may have a saturated structure or may have a part of unsaturated bonds. The alicyclic structure may be a monocyclic alicyclic structure, or a polycyclic alicyclic structure such as bicyclic and tricyclic. As described above, from the viewpoint of adjusting the physical properties of the obtained adhesive, the alicyclic structure is preferably a polycyclic alicyclic structure (polycyclic structure). Furthermore, considering the compatibility of the (meth)acrylate polymer (A) with other components, the above-mentioned polycyclic structure is particularly preferably bicyclic to tetracyclic. Also, as described above, from the viewpoint of adjusting the physical properties of the adhesive obtained, the carbon number of the alicyclic structure (means the total number of carbons in the part forming the ring, and when multiple rings exist independently, it represents the total carbon Number), usually 5 or more is preferred, 7 or more is particularly preferred. On the other hand, the upper limit of the carbon number of the alicyclic structure is not particularly limited. From the viewpoint of compatibility with the above, 15 or less is preferable, and 10 or less is particularly preferable.
上述含脂環結構單體具體例如(甲基)丙烯酸環己酯、(甲基)丙烯酸二環戊酯、(甲基)丙烯酸金剛烷酯、(甲基)丙烯酸異莰酯、(甲基)丙烯酸二環戊烯酯、(甲基)丙烯酸二環戊烯氧基乙酯等,其中,以發揮更優良的發光體埋入性的(甲基)丙烯酸二環戊酯(脂環結構的碳數:10)、(甲基)丙烯酸金剛烷酯(脂環結構的碳數:10)、或(甲基)丙烯酸異莰酯(脂環結構的碳數:7)為佳,特別以 (甲基)丙烯酸異莰酯為佳。這些可單獨使用,也可組合2種以上使用。The above-mentioned alicyclic structure-containing monomers are specifically, for example, cyclohexyl (meth)acrylate, dicyclopentyl (meth)acrylate, adamantyl (meth)acrylate, isobornyl (meth)acrylate, (meth) Dicyclopentenyl acrylate, dicyclopentenyloxyethyl (meth)acrylate, etc., among them, dicyclopentyl (meth)acrylate (alicyclic carbon Number: 10), adamantyl (meth)acrylate (carbon number of alicyclic structure: 10), or isobornyl (meth)acrylate (carbon number of alicyclic structure: 7) is preferred, especially (former Base) isobornyl acrylate is preferred. These can be used individually or in combination of 2 or more types.
在(甲基)丙烯酸酯聚合物(A)含有含脂環結構單體做為構成該聚合物的單體單元的情形,以含有該含脂環結構單體1質量%以上為佳,特別以含有5質量%以上為佳,更以含有9質量%以上為佳。又,(甲基)丙烯酸酯聚合物(A)以含有30質量%以下的含脂環結構單體做為構成該聚合物的單體單元為佳,特別以含有25質量%以下為佳,更以含有20質量%以下為佳。含脂環結構單體的含量在上述範圍者,容易調整所得的黏著劑為上述物性值。In the case where the (meth)acrylate polymer (A) contains an alicyclic structure-containing monomer as the monomer unit constituting the polymer, it is preferable to contain 1% by mass or more of the alicyclic structure-containing monomer, especially It is preferably 5% by mass or more, and more preferably 9% by mass or more. In addition, the (meth)acrylate polymer (A) preferably contains 30% by mass or less of alicyclic structure-containing monomers as the monomer units constituting the polymer, and particularly preferably contains 25% by mass or less, and more It is better to contain 20% by mass or less. When the content of the alicyclic structure-containing monomer is in the above range, it is easy to adjust the resulting adhesive to the above physical property value.
上述(甲基)丙烯酸酯聚合物(A)含有含氮原子單體做為構成該聚合物的單體單元者也佳。因為以含氮原子單體做為構成單元存在於聚合物中,可提供黏著劑指定的極性,對於具有如玻璃的某程度的極性的被黏著體也能成為親和性優良者。上述含氮原子單體,從在(甲基)丙烯酸酯聚合物(A)具有適度的剛性、提高凝膠分率、以及提高所得的黏著劑在50℃的儲存模數到指定程度的觀點,以具有含氮雜環的單體為佳。又從提高在所構成的黏著劑的高維結構中來自上述含氮原子單體的部分的自由度的觀點,該含氮原子單體較佳為,在用於形成(甲基)丙烯酸酯聚合物(A)的聚合所使用的1個聚合性基以外不含有反應性不飽和雙鍵基者。又,在此所述的含氮原子單體排除前述的含反應性官能基單體。It is also preferable that the (meth)acrylate polymer (A) contains a nitrogen atom-containing monomer as a monomer unit constituting the polymer. Because the nitrogen atom-containing monomer is present in the polymer as a structural unit, it can provide the specified polarity of the adhesive, and it can also become a good affinity for adherends with a certain degree of polarity such as glass. The above-mentioned nitrogen-containing monomers have moderate rigidity in the (meth)acrylate polymer (A), increase the gel fraction, and increase the storage modulus of the resulting adhesive at 50°C to a specified level. Monomers with nitrogen-containing heterocycles are preferred. From the viewpoint of increasing the degree of freedom of the part derived from the above-mentioned nitrogen-containing monomer in the high-dimensional structure of the formed adhesive, the nitrogen-containing monomer is preferably used to form (meth)acrylate polymer Those that do not contain a reactive unsaturated double bond group other than one polymerizable group used in the polymerization of the substance (A). In addition, the nitrogen atom-containing monomer described herein excludes the aforementioned reactive functional group-containing monomer.
具有含氮雜環的單體,例如N-(甲基)丙烯醯基嗎啉、N-乙烯基-2-吡咯啶酮、N-(甲基)丙烯醯基吡咯啶酮、N-(甲基)丙烯醯基哌啶、N-(甲基)丙烯醯基吡咯啶、N-(甲基)丙烯醯基吖環丙烷、(甲基)丙烯酸吖環丙烷基乙酯、2-乙烯基吡啶、4-乙烯基吡啶、2-乙烯基吡、1-乙烯基咪唑、N-乙烯基咔唑、N-乙烯基酞醯亞胺等,其中,以發揮更優良黏著力的N-(甲基)丙烯醯基嗎啉為佳,特別以N-丙烯醯基嗎啉為佳。這些可單獨使用,也可組合2種以上使用。Monomers with nitrogen-containing heterocycles, such as N-(meth)acryloylmorpholine, N-vinyl-2-pyrrolidone, N-(meth)acryloylpyrrolidone, N-(methyl) Yl)acryloyl piperidine, N-(meth)acryloyl pyrrolidine, N-(meth)acryloyl pyrrolidine, N-(meth)acryloyl acridine, (meth)acrylic acid acrylethyl, 2-vinylpyridine , 4-vinylpyridine, 2-vinylpyridine , 1-vinylimidazole, N-vinylcarbazole, N-vinylphthalimide, etc. Among them, N-(meth)acryloylmorpholine, which exhibits better adhesion, is preferred, especially N -Acrylic morpholine is preferred. These can be used individually or in combination of 2 or more types.
在(甲基)丙烯酸酯聚合物(A)含有含氮原子單體做為構成該聚合物的單體單元的情形,以含有該含氮原子單體1質量%以上為佳,特別以含有2質量%以上為佳,更以含有3質量%以上為佳。又,(甲基)丙烯酸酯聚合物(A)以含有20質量%以下的含氮原子單體做為構成該聚合物的單體單元為佳,特別以含有15質量%以下為佳,更以含有10質量%以下為佳。含氮原子單體的含量在上述範圍者,容易調整所得的黏著劑在50℃的儲存模數及凝膠分率在前述範圍內。In the case where the (meth)acrylate polymer (A) contains a nitrogen atom-containing monomer as the monomer unit constituting the polymer, the nitrogen atom-containing monomer is preferably 1% by mass or more, especially 2 It is better to contain at least 3% by mass, and more preferably to contain at least 3% by mass. In addition, the (meth)acrylate polymer (A) preferably contains 20% by mass or less of nitrogen atom-containing monomers as the monomer units constituting the polymer, and particularly preferably contains 15% by mass or less, and more preferably The content is preferably 10% by mass or less. If the content of the nitrogen atom-containing monomer is within the above range, it is easy to adjust the storage modulus and gel fraction of the resulting adhesive at 50° C. within the above range.
(甲基)丙烯酸酯聚合物(A)也可視需要含有其他單體做為構成該聚合物之單體單元。為了不阻礙含反應性官能基單體的前述作用,其他單體以不含有反應性官能基的單體為佳。如此的單體例如(甲基)丙烯酸甲氧基乙酯、(甲基)丙烯酸乙氧基乙酯等的(甲基)丙烯酸烷氧基烷基酯、乙酸乙酯、苯乙烯等。這些可單獨使用,也可組合2種以上使用。The (meth)acrylate polymer (A) may optionally contain other monomers as monomer units constituting the polymer. In order not to hinder the aforementioned effects of the reactive functional group-containing monomer, the other monomer is preferably a monomer that does not contain a reactive functional group. Examples of such monomers are alkoxyalkyl (meth)acrylates such as methoxyethyl (meth)acrylate, ethoxyethyl (meth)acrylate, etc., ethyl acetate, styrene, and the like. These can be used individually or in combination of 2 or more types.
(甲基)丙烯酸酯聚合物(A)以直鏈狀的聚合物為佳。由於為直鏈狀的聚合物,分子鏈的糾纏容易發生,容易獲得具有前述凝膠分率的黏著劑。The (meth)acrylate polymer (A) is preferably a linear polymer. Since it is a linear polymer, entanglement of molecular chains easily occurs, and it is easy to obtain an adhesive having the aforementioned gel fraction.
又,(甲基)丙烯酸酯聚合物(A)以經由溶液聚合法獲得的溶液聚合物為佳。由於為溶液聚合物,容易得到高分子量聚合物,可期待凝集力的提升,因此容易得到在耐久條件下的發光體封裝性更優良的黏著劑。又,成為黏著劑中的殘餘單體量變少、耐光性優良者。In addition, the (meth)acrylate polymer (A) is preferably a solution polymer obtained by a solution polymerization method. Since it is a solution polymer, it is easy to obtain a high-molecular-weight polymer, and an improvement in cohesive force can be expected. Therefore, it is easy to obtain an adhesive with better encapsulation properties of the light-emitting body under durable conditions. In addition, the amount of residual monomers in the adhesive is reduced and the light resistance is excellent.
(甲基)丙烯酸酯聚合物(A)的聚合型態,可為無規共聚物,也可以是嵌段共聚物。The polymerization type of the (meth)acrylate polymer (A) may be a random copolymer or a block copolymer.
(甲基)丙烯酸酯聚合物(A)的重量平均分子量,下限值以20萬以上為佳,特別以30萬以上為佳,更以40萬以上為佳。當(甲基)丙烯酸酯聚合物(A)的重量平均分子量的下限值為上述,容易滿足前述的凝膠分率及儲存模數的下限值。The lower limit of the weight average molecular weight of the (meth)acrylate polymer (A) is preferably 200,000 or more, particularly 300,000 or more, and more preferably 400,000 or more. When the lower limit of the weight average molecular weight of the (meth)acrylate polymer (A) is the above, it is easy to satisfy the aforementioned lower limit of the gel fraction and storage modulus.
又(甲基)丙烯酸酯聚合物(A)的重量平均分子量,上限值以200萬以下為佳,150萬以下較佳,特別以100萬以下為佳。當(甲基)丙烯酸酯聚合物(A)的重量平均分子量的上限值為上述以下,容易滿足前述的儲存模數的上限值。又,本說明書中的重量平均分子量是以凝膠滲透層析(GPC)法所測量的標準聚苯乙烯所換算的值。Moreover, the upper limit of the weight average molecular weight of the (meth)acrylate polymer (A) is preferably 2 million or less, preferably 1.5 million or less, and particularly preferably 1 million or less. When the upper limit value of the weight average molecular weight of the (meth)acrylate polymer (A) is below the above, it is easy to satisfy the upper limit of the aforementioned storage modulus. In addition, the weight average molecular weight in this specification is the value converted from the standard polystyrene measured by the gel permeation chromatography (GPC) method.
又,在黏著劑組合物P中,(甲基)丙烯酸酯聚合物(A)可單獨使用1種,也可組合2種以上使用。Moreover, in the adhesive composition P, (meth)acrylate polymer (A) may be used individually by 1 type, and may be used in combination of 2 or more types.
(1-2) 交聯劑(B) 交聯劑(B)可經由黏著劑組合物P的加熱使(甲基)丙烯酸酯聚合物(A)交聯,良好形成三維網絡結構。因此,所得的黏著劑的凝集力提高,所得的黏著劑的凝膠分率及儲存模數容易調整於上述範圍。(1-2) Crosslinking agent (B) The crosslinking agent (B) can crosslink the (meth)acrylate polymer (A) by heating the adhesive composition P to form a three-dimensional network structure well. Therefore, the cohesive force of the obtained adhesive is improved, and the gel fraction and storage modulus of the obtained adhesive are easily adjusted within the above-mentioned range.
上述交聯劑(B)可為和(甲基)丙烯酸酯聚合物(A)所具的反應性基反應者,例如異氰酸酯類交聯劑、環氧類交聯劑、胺類交聯劑、三聚氰胺類交聯劑、吖環丙烷類交聯劑、聯胺類交聯劑、醛類交聯劑、㗁唑啉類交聯劑、金屬烷氧化物類交聯劑、金屬螯合劑類交聯劑、金屬鹽類交聯劑、銨鹽類交聯劑等。上述之中,在(甲基)丙烯酸酯聚合物(A)所具的反應性基為羥基的情形,宜使用和羥基反應性優良的異氰酸酯類交聯劑,在(甲基)丙烯酸酯聚合物(A)所具的反應性基為羧基的情形,宜使用和羧基反應性優良的環氧類交聯劑。又交聯劑(B)可單獨使用1種,也可組合2種以上使用。The above-mentioned crosslinking agent (B) may be a reactive group with the (meth)acrylate polymer (A), such as isocyanate crosslinking agents, epoxy crosslinking agents, amine crosslinking agents, Melamine-based cross-linking agents, acridine-based cross-linking agents, hydrazine cross-linking agents, aldehyde-based cross-linking agents, azoline-based cross-linking agents, metal alkoxide-based cross-linking agents, metal chelating agents cross-linking Agent, metal salt crosslinking agent, ammonium salt crosslinking agent, etc. Among the above, when the reactive group of the (meth)acrylate polymer (A) is a hydroxyl group, it is preferable to use an isocyanate-based crosslinking agent with excellent reactivity with the hydroxyl group. (A) When the reactive group is a carboxyl group, it is preferable to use an epoxy-based crosslinking agent having excellent reactivity with the carboxyl group. Moreover, a crosslinking agent (B) may be used individually by 1 type, and may be used in combination of 2 or more types.
異氰酸酯類交聯劑為至少包含多異氰酸酯化合物者。多異氰酸酯化合物例如甲苯二異氰酸酯、二苯基甲烷二異氰酸酯、二甲苯撐基二異氰酸酯(xylylene diisocyanate)等的芳族聚異氰酸酯、六亞甲基二異氰酸酯等的脂族聚異氰酸酯、異佛爾酮二異氰酸酯、氫化二苯基甲烷二異氰酸酯等的脂環族聚異氰酸酯等,及該等的縮二脲(biuret)體、三聚異氰酸酯體,更例如和乙二醇、丙二醇、新戊二醇、三羥甲基丙烷、蓖麻油等的小分子含活性氫化合物的反應物之加成物(adduct)等。其中,從和羥基的反應性的觀點,以三羥甲基丙烷改質的芳族聚異氰酸酯、特別是三羥甲基丙烷改質甲苯二異氰酸酯及三羥甲基丙烷改質二甲苯二異氰酸酯為佳。The isocyanate-based crosslinking agent contains at least a polyisocyanate compound. Polyisocyanate compounds such as toluene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate (xylylene diisocyanate) and other aromatic polyisocyanates, hexamethylene diisocyanate and other aliphatic polyisocyanates, isophorone diisocyanate Alicyclic polyisocyanates such as isocyanate, hydrogenated diphenylmethane diisocyanate, etc., and these biuret (biuret) body, trimeric isocyanate body, more for example and ethylene glycol, propylene glycol, neopentyl glycol, three Adducts of reactants of small molecules such as hydroxymethyl propane and castor oil containing active hydrogen compounds. Among them, from the viewpoint of reactivity with hydroxyl groups, aromatic polyisocyanates modified by trimethylolpropane, especially trimethylolpropane modified toluene diisocyanate and trimethylolpropane modified xylene diisocyanate are good.
環氧樹脂類交聯劑例如1,3-雙(N,N-二環氧丙基胺基甲基)環己烷、N,N,N’,N’-四環氧丙基-m-二甲苯二胺、乙二醇二環氧丙基醚、1,6-己二醇二環氧丙基醚、三羥甲基丙烷二環氧丙基醚、二環氧丙基苯胺、二環氧丙基胺等。其中,從和羧基的反應性的觀點,以1,3-雙(N,N-二環氧丙基胺基甲基)環己烷為佳。Epoxy resin crosslinking agents such as 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane, N,N,N',N'-tetraglycidyl-m- Xylene diamine, ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane diglycidyl ether, diglycidyl aniline, bicyclic Oxypropylamine and so on. Among them, from the viewpoint of reactivity with a carboxyl group, 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane is preferred.
黏著性組合物P中的交聯劑(B)的含量,相對於(甲基)丙烯酸酯聚合物(A) 100質量份,以0.01質量份以上為佳,0.05質量份以上特佳,0.1質量份以上更佳。又,該含量以10質量份以下為佳,5質量份以下特佳,0.4質量份以下更佳。交聯劑(B)的含量在上述範圍者,更容易滿足上述的凝膠分率及儲存模數。The content of the crosslinking agent (B) in the adhesive composition P is preferably 0.01 parts by mass or more, particularly preferably 0.05 parts by mass or more, 0.1 parts by mass relative to 100 parts by mass of the (meth)acrylate polymer (A) More than a portion is better. In addition, the content is preferably 10 parts by mass or less, particularly preferably 5 parts by mass or less, and more preferably 0.4 parts by mass or less. If the content of the crosslinking agent (B) is in the above range, it is easier to satisfy the above gel fraction and storage modulus.
(1-3) 各種添加劑 黏著性組合物P中,可視需要在丙烯酸類黏著劑添加通常使用的各種添加劑,例如矽烷偶合劑、紫外線吸收劑、抗靜電劑、增黏劑、抗氧化劑、光穩定劑、軟化劑、折射率調整劑、防鏽劑等。又,後述的聚合溶劑及稀釋溶劑不包含於構成黏著性組合物P的添加劑。(1-3) Various additives In the adhesive composition P, various additives commonly used can be added to the acrylic adhesive as needed, such as silane coupling agent, ultraviolet absorber, antistatic agent, tackifier, antioxidant, light stabilizer, softener, refractive index Adjusting agent, anti-rust agent, etc. In addition, the polymerization solvent and the dilution solvent described later are not included in the additives constituting the adhesive composition P.
上述之中,黏著性組合物P以含有矽烷偶合劑為佳。因此,和被黏著體之背光(發光體、基板、反射膜)、擴散元件等的光學元件的密接性提高,在耐久條件下的發光體封裝性更加優良。Among the above, the adhesive composition P preferably contains a silane coupling agent. Therefore, the adhesiveness with optical elements such as the backlight (luminous body, substrate, reflective film) and diffuser of the adherend is improved, and the encapsulation of the luminous body under durable conditions is more excellent.
矽烷偶合劑以分子內具有至少1個烷氧基矽基的有機矽化合物,和(甲基)丙烯酸酯聚合物(A)的相溶性佳,具有透光性者為佳。The silane coupling agent is an organosilicon compound having at least one alkoxysilyl group in the molecule, and has good compatibility with the (meth)acrylate polymer (A) and is preferably light-transmitting.
如此的矽烷偶合劑,例如乙烯三甲氧基矽烷、乙烯三乙氧基矽烷、甲基丙烯醯氧基丙基三甲氧基矽烷等的含有聚合性不飽和基的矽化合物、3-環氧丙基丙基三甲氧基矽烷、2-(3,4-環氧基環己基)乙基三甲氧基矽烷等的具有環氧結構的矽化合物、3-巰基丙基三甲氧基矽烷、3-巰基丙基三乙氧基矽烷、3-巰基丙基二甲氧基甲基矽烷等的含有巰基的矽化合物、3-胺基丙基三甲氧基矽烷、N-(2-胺基乙基)-3-胺基丙基三甲氧基矽烷、N-(2-胺基乙基)-3-胺基丙基甲基二甲氧基矽烷等的含有胺基的矽化合物、3-氯丙基三甲氧基矽烷、3-異氰酸酯丙基三乙氧基矽烷,或者這些的至少1個和甲基三乙氧基矽烷、乙基三乙氧基矽烷、甲基三甲氧基矽烷、乙基三甲氧基矽烷等的含有烷基的矽化合物之縮合物等。這些可單獨使用1種,也可組合2種以上使用。Such a silane coupling agent, for example, ethylene trimethoxysilane, ethylene triethoxysilane, methacryloxypropyl trimethoxysilane, and other polymerizable unsaturated group-containing silicon compounds, 3-epoxypropyl Silicon compounds with epoxy structure such as propyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropane Sulfhydryl-containing silicon compounds such as triethoxysilane, 3-mercaptopropyldimethoxymethylsilane, 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3 -Aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane and other amino group-containing silicon compounds, 3-chloropropyltrimethoxysilane Triethoxysilane, 3-isocyanate propyltriethoxysilane, or at least one of these and methyltriethoxysilane, ethyltriethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane Condensates of silicon compounds containing alkyl groups. These may be used individually by 1 type, and may be used in combination of 2 or more types.
黏著性組合物P中的矽烷偶合劑的含量,相對於(甲基)丙烯酸酯聚合物(A) 100質量份,以0.01質量份以上為佳,0.05質量份以上特佳,0.1質量份以上更佳。又,該含量以1質量份以下為佳,0.5質量份以下特佳,0.3質量份以下更佳。The content of the silane coupling agent in the adhesive composition P is preferably 0.01 parts by mass or more, preferably 0.05 parts by mass or more, and more preferably 0.1 parts by mass or more with respect to 100 parts by mass of the (meth)acrylate polymer (A) good. In addition, the content is preferably 1 part by mass or less, particularly preferably 0.5 parts by mass or less, and more preferably 0.3 parts by mass or less.
(2) 黏著性組合物之製作 黏著性組合物P可由以下製造,製造(甲基)丙烯酸酯聚合物(A),將所得的(甲基)丙烯酸酯聚合物(A)和交聯劑(B)混合,且視需要加入添加劑。(2) Making of adhesive composition Adhesive composition P can be produced by producing (meth)acrylate polymer (A), mixing the obtained (meth)acrylate polymer (A) and crosslinking agent (B), and adding additives as necessary .
(甲基)丙烯酸酯聚合物(A)可經由將構成聚合物的單體的混合物以一般的自由基聚合法使其聚合而製造。(甲基)丙烯酸酯聚合物(A)的聚合,視需要使用聚合起始劑經溶液聚合法來進行為佳。聚合溶液例如乙酸乙酯、乙酸正丁酯、乙酸異丁酯、甲苯、丙酮、己烷、甲乙酮等,也可併用2種以上。The (meth)acrylate polymer (A) can be produced by polymerizing a mixture of monomers constituting the polymer by a general radical polymerization method. The polymerization of the (meth)acrylate polymer (A) is preferably carried out by a solution polymerization method using a polymerization initiator as necessary. For the polymerization solution, for example, ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, etc., two or more kinds may be used in combination.
聚合起始劑例如偶氮類化合物、有機過氧化物等,也可併用2種以上。偶氮化合物例如2,2’-偶氮雙異丁腈、2,2’-偶氮雙(2-甲基丁腈)、1,1’-偶氮雙(環己烷1-甲腈)、2,2’-偶氮雙(2,4-二甲基戊腈)、2,2’-偶氮雙(2,4-二甲基-4-甲氧基戊腈)、2,2’-偶氮雙(2-甲基丙酸)二甲酯、4,4’-偶氮雙(4-氰戊酸)、2,2’-偶氮雙(2-羥基甲基丙腈)、2,2’-偶氮雙[2-(2-咪唑啉-2-基)丙烷]等。The polymerization initiator, for example, an azo compound, an organic peroxide, etc., may be used in combination of two or more kinds. Azo compounds such as 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cyclohexane 1-carbonitrile) , 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethyl-4-methoxyvaleronitrile), 2,2 '-Azobis(2-methylpropionic acid) dimethyl ester, 4,4'-Azobis(4-cyanovaleric acid), 2,2'-Azobis(2-hydroxymethylpropionitrile) , 2,2'-Azobis[2-(2-imidazolin-2-yl)propane] and the like.
有機過氧化物例如過氧化苯甲醯、過氧苯甲酸三級丁酯、過氧化氫異丙苯、過氧化二碳酸二異丙酯、過氧化二碳酸二正丙酯、二(2-乙氧基乙基)過氧化二碳酸酯、過氧化新癸酸三級丁酯、過氧化三甲乙酸三級丁酯、過氧化(3,5,5-三甲基己醯)、過氧化二丙醯、過氧化二乙醯等。Organic peroxides such as benzyl peroxide, tertiary butyl peroxybenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate, di(2-ethyl (Oxyethyl) peroxydicarbonate, tertiary butyl peroxyneodecanoate, tertiary butyl peroxide, trimethylacetate, peroxide (3,5,5-trimethylhexyl), dipropylene peroxide Diethyl peroxide, diacetyl peroxide, etc.
又,上述聚合步驟中,透過調配2-巰基乙醇等的鏈轉移劑,可調節所得的聚合物的重量平均分子量。In addition, in the above-mentioned polymerization step, the weight average molecular weight of the obtained polymer can be adjusted by formulating a chain transfer agent such as 2-mercaptoethanol.
如果獲得(甲基)丙烯酸酯聚合物(A),則在(甲基)丙烯酸酯聚合物(A)的溶液添加交聯劑(B)、及視需要添加稀釋溶劑及添加劑,經充分混合,獲得以溶劑稀釋的黏著劑組合物P(塗佈溶液)。又,上述各成分任一者,在使用固體狀的情形,或者在未稀釋的狀態和其他成分混合時發生析出的情形,可將該成分單獨事先溶解或稀釋於稀釋溶劑再和其他成分混合。If the (meth)acrylate polymer (A) is obtained, the crosslinking agent (B) is added to the solution of the (meth)acrylate polymer (A), and the diluent solvent and additives are added as necessary, and after thorough mixing, The adhesive composition P (coating solution) diluted with a solvent was obtained. In addition, when any of the above-mentioned components are used in a solid state, or when they precipitate when mixed with other components in an undiluted state, the component may be dissolved in advance alone or diluted in a dilution solvent and mixed with other components.
上述稀釋溶劑,使用例如己烷、庚烷、環己烷等的脂族烴類、甲苯、二甲苯等的芳族烴類、氯化甲烷(methylene chloride)、氯化乙烯(ethylene chloride)等的鹵化烴、甲醇、乙醇、丙醇、丁醇、1-甲氧基-2-丙醇等的醇類、丙酮、甲乙酮、2-戊酮、異氟爾酮(isophorone)、環己酮等的酮類、乙酸乙酯、乙酸丁酯等的酯類、乙基賽路蘇等的賽路蘇類(cellosolve)溶劑等。The above-mentioned diluting solvent uses, for example, aliphatic hydrocarbons such as hexane, heptane, and cyclohexane, aromatic hydrocarbons such as toluene and xylene, methylene chloride, ethylene chloride, etc. Halogenated hydrocarbons, methanol, ethanol, propanol, butanol, 1-methoxy-2-propanol and other alcohols, acetone, methyl ethyl ketone, 2-pentanone, isophorone (isophorone), cyclohexanone, etc. Esters such as ketones, ethyl acetate, and butyl acetate, cellosolve solvents such as ethyl ceresol, etc.
如此所製作的塗佈溶液的濃度、黏度可在可塗佈的範圍,沒有特別限制,可視情況適當選擇。例如,黏著劑組合物P的濃度稀釋成10~60質量%。又,在獲得塗佈溶液之時,稀釋溶劑等的添加不是必要條件,黏著劑組合物P如果是可塗佈的黏度等,也可不添加稀釋溶劑。此種情形,黏著劑組合物P為(甲基)丙烯酸酯聚合物(A)的聚合溶劑直接做為稀釋溶劑的塗佈溶液。The concentration and viscosity of the coating solution prepared in this way can be in the coatable range, there is no particular limitation, and it can be appropriately selected according to the situation. For example, the concentration of the adhesive composition P is diluted to 10 to 60% by mass. In addition, when the coating solution is obtained, the addition of a dilution solvent or the like is not a necessary condition, and if the adhesive composition P has a viscosity or the like that can be applied, the dilution solvent may not be added. In this case, the adhesive composition P is a coating solution in which the polymerization solvent of the (meth)acrylate polymer (A) is directly used as the diluting solvent.
(3) 黏著劑層的形成
本實施態樣之黏著劑層11較佳由使黏著劑組合物P(的塗佈層)交聯的黏著劑所構成。黏著劑組合物P的交聯通常可經由加熱處理進行。又,此加熱處理也可兼作在塗佈於所欲的對象物的黏著劑組合物P的塗佈層揮發稀釋溶劑等時的乾燥處理。(3) Formation of adhesive layer
The
加熱處理的加熱溫度以50~150℃為佳,特別以70~120℃為佳。加熱時間以10秒~10分鐘為佳,特別以50秒~2分鐘為佳。The heating temperature of the heat treatment is preferably 50~150℃, especially 70~120℃. The heating time is preferably 10 seconds to 10 minutes, especially 50 seconds to 2 minutes.
加熱處理後也可視需要設置在常溫(例如23℃、50%RH)下約1~2週的熟化時間。在必須要此熟化時間的情形,在經過熟化時間後,在不需要熟化時間的情形,在加熱處理結束後,形成黏著劑。After the heat treatment, the aging time may be set at normal temperature (for example, 23°C, 50%RH) for about 1 to 2 weeks as needed. In the case where this aging time is necessary, after the aging time has elapsed, when the aging time is not required, the adhesive is formed after the heat treatment is completed.
經由上述的加熱處理(及熟化),透過交聯劑(B),使(甲基)丙烯酸酯聚合物(A)充分交聯。如此所得的黏著劑容易滿足上述物性值。Through the above-mentioned heat treatment (and aging), the (meth)acrylate polymer (A) is sufficiently cross-linked through the cross-linking agent (B). The adhesive thus obtained easily satisfies the above-mentioned physical property values.
(4) 黏著劑之物性
本實施態樣之黏著劑所含的單體量,主要為用於(甲基)丙烯酸酯聚合物(A)的共聚合的單體殘餘量,以10質量%以下為佳,特別以1質量%以下為佳,更以小於0.1質量%為佳。因此,所得的黏著劑層11成為耐光性優良,即使在接觸發光的複數個發光體的狀態長時間使用也可抑制變色。(4) Physical properties of adhesive
The amount of monomers contained in the adhesive of this embodiment is mainly the residual amount of monomers used in the copolymerization of the (meth)acrylate polymer (A), preferably 10% by mass or less, especially 1 mass % Or less is better, and more preferably less than 0.1% by mass. Therefore, the resulting
本實施態樣之黏著劑所含的單體量的下限值,以0質量%為最好,通常以0.001質量%以上為佳,特別以0.005質量%以上為佳。The lower limit of the amount of monomers contained in the adhesive of this embodiment is preferably 0% by mass, usually 0.001% by mass or more, and particularly preferably 0.005% by mass or more.
1-2. 剝離片
剝離片12a、12b是保護黏著劑層11直到黏著片1使用時,在使用黏著片1 (黏著劑層11)時被剝離。在本實施態樣之黏著片1,剝離片12a、12b中之一或兩者並非必要者。1-2. Peeling sheet
The
剝離片12a、12b使用例如聚乙烯薄膜、聚丙烯薄膜、聚丁烯薄膜、聚丁二烯薄膜、聚甲基戊烯薄膜、聚氯乙烯薄膜、氯乙烯共聚物薄膜、聚對苯二甲酸乙二酯薄膜、聚萘二甲酸乙二酯薄膜、聚對苯二甲酸丁二酯薄膜、聚氨酯薄膜、乙烯乙酸乙酯薄膜、離子聚合物樹脂薄膜、乙烯•(甲基)丙烯酸共聚物薄膜、乙烯•(甲基)丙烯酸酯共聚物薄膜、聚苯乙烯薄膜、聚碳酸酯薄膜、聚醯亞胺薄膜、氟樹酯薄膜等。也可使用此等的交聯膜。再者,也可為此等的積層膜。The
在上述剝離片12a、12b的剝離面(特別是和黏著劑層11相接的面),以施行剝離處理為佳。用於剝離處理的剝離劑,例如醇酸類、聚矽氧類、氟類、不飽和聚酯類、聚烯烴類、蠟類的剝離劑。剝離片12a、12b中,以一方的剝離片做為剝離力大的重剝離型剝離片,另一方的剝離片做為剝離力小的輕剝離型剝離片者為佳。It is preferable to perform a peeling process on the peeling surface of the said
剝離片12a、12b的厚度沒有特別限制,通常為約20~150μm。The thickness of the
2. 物性
(1) 全光線透過率
本實施態樣之黏著劑片1的黏著劑層11的全光線透過率(根據JIS K7361-1:1997基準所測量的值),以90%以上為佳,特別以93%以上為佳,更以95%以上為佳。當全光線透過率為上述,透明性高,成為適合作為背光貼附用者。2. Physical properties
(1) Total light transmittance
The total light transmittance of the
又,將本實施態樣之黏著劑片1放置在50℃、50%RH的條件下500小時後的黏著劑層11的全光線透過率,以90%以上為佳,特別以93%以上為佳,更以95%以上為佳。當此全光線透過率為上述,即使在與黏著劑層11接觸的發光體的發熱狀態為長時間持續的耐熱條件下,仍然透明性高,成為更適合做為背光貼附用者。In addition, the total light transmittance of the
再者,對於本實施態樣之黏著劑片1,以照度500mW/m2
照射紫外線500小時後的黏著劑層11的全光線透過率,以90%以上為佳,特別以93%以上為佳,更以95%以上為佳。當此全光線透過率為上述,即使在和黏著劑層11接觸的發光體的發光狀態為長時間持續的條件下,仍可謂耐光性優良,成為更適合做為背光貼附用者。Furthermore, for the
(2) 霧度值
本實施態樣之黏著片1的黏著劑層11的霧度值,以30%以下為佳,20%以下較佳,特別以10%以下為佳,更以1%以下為佳。由於黏著劑層11的霧度值為上述,透光性優良,成為適合做為背光貼附用者。又,上述霧度值是也包含黏著劑層的厚度的特性值,不論黏著劑層的厚度,滿足上述霧度值者為佳。(2) Haze value
The haze value of the
本實施態樣之黏著劑層11的厚度即使較250μm厚,也容易滿足上述霧度值。本實施態樣之黏著片1因使用上述黏著劑組合物P,可達到如上述般的低霧度值。Even if the thickness of the
又,將本實施態樣之黏著片1放置在50℃、50%RH的條件下500小時後的黏著劑層11 的霧度值,以30%以下為佳,20%以下較佳,特別以10%以下為佳,更以1%以下為佳。當此霧度值為上述,即使在和黏著劑層11接觸的發光體的發熱狀態為長時間持續的耐熱條件下,仍然透明性高,成為更適合做為背光貼附用者。In addition, the haze value of the
再者,對於本實施態樣之黏著片1,以照度500mW/m2
照射紫外線500小時後的黏著劑層11的霧度值,以30%以下為佳,20%以下較佳,特別以10%以下為佳,更以1%以下為佳。當此全光線透過率為上述,即使在和黏著劑層11接觸的發光體的發光狀態為長時間持續的條件下,仍可謂耐光性優良,成為更適合做為背光貼附用者。Furthermore, for the
又,即使在任何條件下,本實施態樣之黏著片1的黏著劑層11的霧度值的下限值,沒有特別限定,以0%以上為佳,0.1%以上較佳。此處,本說明書之霧度值為根據JIS K7136:2000所測量之值。In addition, even under any conditions, the lower limit of the haze value of the
(3) 色彩
本實施態樣之黏著劑層11根據CIE1976L*a*b*表色系所規定的色度a*,以-5.0~5.0為佳,特別以-3.0~3.0為佳,更以-2.0~2.0為佳。又本實施態樣之黏著劑層11根據CIE1976L*a*b*表色系所規定的色度b*,以-5.0~5.0為佳,特別以-3.0~3.0為佳,更以-2.0~2.0為佳。色度a*和色度b*為上述範圍者,黏著劑層11接近無色透明,成為適合做為背光貼附用者。(3) Color
The chromaticity a* of the
又,將本實施態樣之黏著片1放置在50℃、50%RH的條件下500小時後的黏著劑層11的色度a*,以-5.0~5.0為佳,特別以-3.0~3.0為佳,更以-2.0~2.0為佳。又色度b*,以-5.0~5.0為佳,特別以-3.0~3.0為佳,更以-2.0~2.0為佳。當色度a*和色度b*為上述範圍,即使在和黏著劑層11接觸的發光體的發熱狀態為長時間持續的耐熱條件下,黏著劑層11仍然接近無色透明,成為更適合做為背光貼附用者。In addition, the chromaticity a* of the
再者,對於本實施態樣之黏著片1,以照度500mW/m2
照射紫外線500小時後的黏著劑層11 的色度a*,以-5.0~5.0為佳,特別以-3.0~3.0為佳,更以-2.0~2.0為佳。又色度b*,以-5.0~5.0為佳,特別以-3.0~3.0為佳,更以-2.0~2.0為佳。當色度a*和色度b*為上述範圍,即使在和黏著劑層11接觸的發光體的發光狀態為長時間持續的條件下,黏著劑層11仍然接近無色透明,可謂耐光性優良,成為更適合做為背光貼附用者。Furthermore, for the
又本說明書之色度a*和色度b*的測量方法如後述試驗例所述。In addition, the measurement methods of the chromaticity a* and the chromaticity b* in this specification are as described in the test examples described later.
(4) 黏著力
本實施態樣之黏著片1對鈉鈣玻璃在23℃的黏著力,下限值以10N/25mm以上為佳,13N/25mm以上較佳,特別以15N/25mm以上為佳,更以26N/25mm以上為佳。當黏著力的下限值為上述,成為發光體封裝性更優良者。又,本實施態樣之黏著片1對鈉鈣玻璃在23℃的黏著力的上限值,以100N/25mm以下為佳,80N/25mm以下較佳, 50N/25mm以下特佳。黏著力的上限值為上述,可得良好的重加工性。(4) Adhesion
The lower limit of the adhesive force of the
在此,本說明書之在23℃的黏著力基本上是指根據JIS Z0237:2009的180度撕下法所測量的黏著力,將測量樣本做為寬25mm、長100mm,將該測量樣本貼附於被黏著體,以0.5MPa在50℃加壓20分鐘後,在常壓、23℃、50%RH的條件下放置24小時,以剝離速度300mm/min測量。Here, the adhesive force at 23°C in this specification basically refers to the adhesive force measured according to the 180 degree peeling method of JIS Z0237:2009. The measurement sample is 25mm wide and 100mm long, and the measurement sample is attached The adherend was pressed at 50°C for 20 minutes at 0.5 MPa, and then placed under normal pressure, 23°C, and 50% RH for 24 hours, and measured at a peeling speed of 300 mm/min.
本實施態樣之黏著片1對鈉鈣玻璃在50℃的黏著力,下限值以2N/25mm以上為佳,特別以4N/25mm以上為佳,更以6N/25mm以上為佳。當黏著力的下限值為上述,成為在耐熱條件下的發光體封裝性更優良者。又,本實施態樣之黏著片1對鈉鈣玻璃在50℃的黏著力的上限值,沒有特別限制,以100N/25mm以下為佳,80N/25mm以下較佳, 50N/25mm以下特佳。The lower limit of the adhesive force of the
本說明書之在50℃的黏著力的測量方法,基本上是指根據JIS Z0237:2009的180度撕下法所測量的黏著力,以測量樣本做為寬25mm、長100mm,將該測量樣本貼附於被黏著體,以0.5MPa在50℃加壓20分鐘後,在常壓、50℃、50%RH的條件下放置6小時,以剝離速度300mm/min測量。The method of measuring the adhesive force at 50°C in this manual basically refers to the adhesive force measured according to the 180 degree peeling method of JIS Z0237:2009. The measurement sample is 25mm wide and 100mm long, and the measurement sample is attached Attach it to the adherend, press it at 50°C for 20 minutes at 0.5 MPa, then leave it for 6 hours under the conditions of normal pressure, 50°C, and 50% RH, and measure at a peeling speed of 300 mm/min.
3. 黏著片之製造
黏著片1之一製造例為,在一方的剝離片12a (或12b)的剝離面上,塗佈上述黏著劑組合物P的塗佈溶液,進行加熱處理,使黏著劑組合物P熱交聯,形成塗佈層後,使該塗佈層和另一方的剝離片12b (或12a)的剝離面疊合。在必須要熟化時間的情形,經過放置熟化時間,在不需要熟化時間的情形則直接使上述塗佈層形成黏著劑層11。經此獲得上述黏著片1。加熱處理及熟化的條件,如同前述。3. Manufacture of Adhesive Sheet
An example of the production of the
黏著片1之另一製造例為,在一方的剝離片12a的剝離面上,塗佈上述黏著劑組合物P的塗佈溶液,進行加熱處理,使黏著劑組合物P熱交聯,形成塗佈層,獲得帶有塗佈層的剝離片12a。在另一方的剝離片12b的剝離面上,塗佈上述黏著劑組合物P的塗佈溶液,進行加熱處理,使黏著劑組合物P熱交聯,形成塗佈層,獲得帶有塗佈層的剝離片12b。之後,將帶有塗佈層的剝離片12a和帶有塗佈層的剝離片12b以兩塗佈層互相接觸的方式而貼合。在此,也可製作複數個帶有塗佈層的剝離片,只貼合所欲數目的該塗佈層。在必須要熟化時間的情形,經過放置熟化時間,在不需要熟化時間的情形則直接使上述積層的塗佈層形成黏著劑層11。經此獲得上述黏著片1。根據此製造例,即使在黏著劑層11厚的情形,也可穩定製造。Another example of the production of the
塗佈上述黏著劑組合物P的塗佈溶液之方法,可利用例如棒塗佈法、刮刀塗佈法、輥塗佈法、板塗佈法、噴嘴塗佈法、凹版塗佈法等。As a method of applying the coating solution of the adhesive composition P, for example, a bar coating method, a knife coating method, a roll coating method, a plate coating method, a nozzle coating method, a gravure coating method, etc. can be used.
[背光單元]
本發明之一實施態樣之背光單元如第2圖所示。
如第2圖所示,本實施態樣之背光單元2,具有在1個或2個以上的基板21上設置複數個發光體22的背光20,及貼附在該背光20以封裝該發光體22的黏著劑層11所構成。[Backlight Unit]
The backlight unit of one embodiment of the present invention is shown in FIG. 2.
As shown in Figure 2, the
上述背光單元2的黏著劑層11為上述背光貼附用黏著片1的黏著劑層11。上述複數個發光體22經此黏著劑層11而無空隙封裝。經此,所得的顯示器內部無空氣層及空隙,可防止因光的反射損失所導致的畫質降低。The
基板21沒有特別限定,能夠使用一般用於背光者。此基板21通常為印刷電路板(PCB基板;Printed Circuit Board)。The
基板21可以將複數個發光體22以整合搭載的方式一體地形成,也可以如在一基板21上搭載一發光體22的方式各自分別形成。在分別形成的情形,各基板21通常固定在框架、支持體、框體等。在本實施態樣,如第2圖所示,以基板21將複數個發光體22以整合搭載的方式一體地形成者為佳。The
在基板21的黏著劑層11側的面,也可以形成反射層,也可以設置反射元件。因此,可有效率地提高因背光20所造成的亮度。反射層及反射元件的材料,可採用公知者。A reflective layer may be formed on the surface of the
發光體22的種類,例如發光二極體(LED)、雷射二極體(LD)、有機電致發光元件、無機電致發光元件等。這些之中,從因黏著劑層11的封裝性的觀點,以LED為佳,特別以次毫米發光二極體(Mini LED)或微發光二極體(Micro LED)為佳。The type of the light-emitting
發光體22的厚度,以10μm以上為佳,30μm以上較佳,50μm以上特佳,80μm以上更佳。又,發光體22的厚度,以300μm以下為佳,特別以150μm以下為佳,更以100μm以下為佳。如果為本實施態樣之黏著劑層11,即使發光體22的厚度在上述範圍,也容易無空隙封裝發光體22。The thickness of the
又,彼此相鄰的發光體22的間隙寬度,以0.01mm以上為佳,特別以0.1 mm以上為佳,更以0.5 mm以上為佳。又,上述間隙寬度以100 mm以下為佳,10 mm以下較佳,特別以4 mm以下為佳,更以2 mm以下為佳。如果是本實施態樣之黏著劑層11,彼此相鄰的發光體22的間隙寬度即使在上述範圍,也容易無空隙封裝發光體22。In addition, the gap width of the
發光體22的形狀沒有特別限定,通常為長方體狀、半球狀等。發光體22的大小沒有特別限定,但從發光體封裝性觀點,以平面看的一邊或直徑為0.01~100mm為佳,0.1~10mm較佳,特別以0.2~5mm為佳,更以0.5~2mm為佳。The shape of the light-emitting
在此,對於使用本實施態樣之背光單元2的顯示器進行說明。顯示器的種類只要是使用背光單元的型,沒有特別限定,但以液晶顯示裝置為主要而例示。Here, the display using the
本實施態樣之一例的液晶顯示裝置如第3圖所示。
如第3圖所示,本實施態樣之液晶顯示裝置3具有上述背光單元2、積層於背光單元2的黏著劑層11之擴散元件31、及積層在擴散元件31的與背光單元2為相反側之液晶面板32所構成。在此液晶顯示裝置3的背光20相當為直下型背光。An example of the liquid crystal display device of this embodiment is shown in FIG. 3.
As shown in FIG. 3, the liquid
擴散元件31為擴散從背光單元2照射的光之元件,由於此擴散元件31,可有效地抑制亮度不均的發生。擴散元件31可採用公知者,例如擴散板及擴散膜,可使用該等之組合等。液晶面板32也可採用公知者。The
又,黏著劑層11和擴散元件31之間、擴散元件31和液晶面板32之間、或在液晶面板32的與擴散元件31為相反側的面,也可設置希望的光學元件。如此的光學元件例如提高亮度薄膜、提高對比薄膜、視角補償薄膜、透明導電性薄膜、液晶聚合物薄膜、半穿透反射膜、防飛散膜等。In addition, between the
在製造本實施態樣之液晶顯示裝置3中,例如,剝離黏著片1的一方剝離片12a,使黏著片1露出的黏著劑層11貼合於背光20的存在發光體22的一側的面。In manufacturing the liquid
之後,從黏著片1的黏著劑層11剝離另一方剝離片12b,使黏著片1露出的黏著劑層11和擴散元件31貼合。之後,使用希望的黏著片,使擴散元件31和液晶面板32貼合。又在其他例也可更換背光20及擴散元件31的貼合順序。After that, the
在上述液晶顯示裝置3,背光單元2的複數個發光體22因黏著劑層11而無空隙被封裝,因此可以防止因光的反射損失所造成的畫質下降。又,此液晶顯示裝置3即使放置在耐久條件下,例如85℃、85%RH、72小時的條件下,也能抑制在黏著劑層11和發光體22的界面的浮起、剝落等的發生,可良好維持因黏著劑層11的發光體22的封裝。In the above-mentioned liquid
以上說明的實施態樣是為了容易理解本發明所記載,並未為了限定本發明而記載。因此,上述實施態樣所揭示之各要素是也包含屬於本發明技術領域之所有設計變更或均等物之旨趣。The embodiments described above are described for easy understanding of the present invention, and are not described to limit the present invention. Therefore, the elements disclosed in the above embodiments also include all design changes or equivalents belonging to the technical field of the present invention.
例如,黏著片1的剝離片12a、12b任一方或兩方也可被省略,或也可積層希望的光學元件以代替剝離片12a及/或12b。
[實施例]For example, either or both of the
以下經由實施例等進一步具體說明本發明,但本發明之範圍不限於此等實施例等。Hereinafter, the present invention will be further specifically described through examples and the like, but the scope of the present invention is not limited to these examples and the like.
[實施例1] 1. (甲基)丙烯酸酯聚合物之製作 將丙烯酸2-乙基己酯 60質量份、丙烯酸異莰酯 10質量份、N-丙烯醯基嗎啉10質量份、及丙烯酸2-羥基乙酯 20質量份,以溶液聚合法使其共聚合,製作(甲基)丙烯酸酯聚合物(A)。此(甲基)丙烯酸酯聚合物(A)的分子量以後述方法測量,為重量平均分子量(Mw) 50萬。[Example 1] 1. Production of (meth)acrylate polymer 60 parts by mass of 2-ethylhexyl acrylate, 10 parts by mass of isobornyl acrylate, 10 parts by mass of N-propenylmorpholine, and 20 parts by mass of 2-hydroxyethyl acrylate were copolymerized by solution polymerization , To produce (meth)acrylate polymer (A). The molecular weight of this (meth)acrylate polymer (A), measured by the method described later, was a weight average molecular weight (Mw) of 500,000.
2. 黏著性組合物的製作
混合上述步驟1所得的(甲基)丙烯酸酯聚合物(A) 100質量份(固形分換算值,以下相同)、和作為交聯劑(B)的三羥甲基丙烷改質甲苯二異氰酸酯 (TOYOCHEM社製,製品名「BHS8515」) 0.15質量份、及作為矽烷偶合劑的3-環氧丙基丙基三甲氧基矽烷 0.2質量份,充分攪拌,以甲乙酮稀釋,獲得黏著性組合物的塗佈溶液。2. Production of adhesive composition
Mix 100 parts by mass of the (meth)acrylate polymer (A) obtained in
在此,以(甲基)丙烯酸酯聚合物(A)為100質量份(固形分換算值)時的黏著性組合物的各調配(固形分換算值)如表1所示。又,表1所記載之代號等的詳細資訊如下所示。 [(甲基)丙烯酸酯聚合物(A)] 2EHA: 丙烯酸2-乙基己酯 IBXA: 丙烯酸異莰酯 ACMO: N-丙烯醯基嗎啉 HEA: 丙烯酸2-羥乙酯 BA: 丙烯酸正丁酯 AA: 丙烯酸 MA:丙烯酸甲酯 EA:丙烯酸乙酯 [交聯劑(B)] TDI: 三羥甲基丙烷改質甲苯二異氰酸酯 (TOYOCHEM社製,製品名「BHS8515」) XDI: 三羥甲基丙烷改質二甲苯撐基二異氰酸酯 (綜研化學社製,製品名「TD-75」) 環氧樹脂: 1,3-雙(N,N-二環氧丙基胺基甲基)環己烷 (三菱氣體化學社製,製品名「TETRAD-C」) A1螯合劑:三乙醯基丙酮鋁(綜研化学社製,製品名「M-5A」)Here, each formulation (solid content conversion value) of the adhesive composition when the (meth)acrylate polymer (A) is 100 parts by mass (solid content conversion value) is shown in Table 1. In addition, the detailed information such as the code numbers listed in Table 1 are as follows. [(Meth)acrylate polymer (A)] 2EHA: 2-ethylhexyl acrylate IBXA: Isobornyl acrylate ACMO: N-acryloylmorpholine HEA: 2-hydroxyethyl acrylate BA: n-butyl acrylate AA: Acrylic MA: methyl acrylate EA: ethyl acrylate [Crosslinker (B)] TDI: Trimethylolpropane modified toluene diisocyanate (manufactured by TOYOCHEM, product name "BHS8515") XDI: Trimethylolpropane modified xylene diisocyanate (manufactured by Soken Chemical Co., Ltd., product name "TD-75") Epoxy resin: 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane (manufactured by Mitsubishi Gas Chemical Corporation, product name "TETRAD-C") A1 chelating agent: aluminum triacetylacetonate (manufactured by Soken Chemical Co., Ltd., product name "M-5A")
3. 黏著片之製造
將上述步驟2所得的黏著性組合物的塗佈溶液,以刮刀塗佈法塗佈在聚對苯二甲酸乙二酯的一面以聚矽氧類剝離劑進行剝離處理的重剝離型剝離片(Lintech社製,製品名「SP-PET752150」)的剝離處理面之後,在90℃加熱處理1分鐘形成塗佈層(厚度:約50μm),製作帶有塗佈層的重剝離型剝離片。3. Manufacture of Adhesive Sheet
The coating solution of the adhesive composition obtained in the
另一方面,將上述步驟2所得的黏著性組合物的塗佈溶液,以刮刀塗佈法塗佈在聚對苯二甲酸乙二酯的一面以聚矽氧類剝離劑進行剝離處理的輕剝離型剝離片(Lintech社製,製品名「SP-PET381130」)的剝離處理面之後,在90℃加熱處理1分鐘形成塗佈層(厚度:約50μm),製作帶有塗佈層的輕剝離型剝離片。此帶有塗佈層的輕剝離型剝離片製作4片。On the other hand, the coating solution of the adhesive composition obtained in the
將上述所得的帶有塗佈層的重剝離型剝離片的塗佈層側的面,和上述所得的第1帶有塗佈層的輕剝離型剝離片的塗佈層側的面貼合,得到由重剝離型剝離片及輕剝離型剝離片夾住、總計厚度約100μm的塗佈層所形成之第1積層體。The surface on the coating layer side of the heavy release release sheet with a coating layer obtained above and the surface on the coating layer side of the first light release release sheet with a coating layer obtained above are bonded together, A first laminate formed of coating layers with a total thickness of about 100 μm sandwiched between a heavy release release sheet and a light release release sheet was obtained.
接著,對於從上述第1積層體剝離輕剝離型剝離片而露出塗佈層的露出面,貼合第2帶有塗佈層的輕剝離型剝離片的塗佈層側的面,得到由重剝離型剝離片及輕剝離型剝離片夾住、總計厚度約150μm的塗佈層所形成之第2積層體。Next, the lightly peelable release sheet is peeled from the first laminate to expose the exposed surface of the coating layer, and the surface of the second lightly peelable release sheet with a coating layer on the coating layer side is bonded to obtain a heavy A second laminate formed by a peelable peeling sheet and a light peeling peeling sheet sandwiching a coating layer with a total thickness of about 150 μm.
接著,對於從上述第2積層體剝離輕剝離型剝離片而露出塗佈層的露出面,貼合第3帶有塗佈層的輕剝離型剝離片的塗佈層側的面,得到由重剝離型剝離片及輕剝離型剝離片夾住、總計厚度約200μm的塗佈層所形成之第3積層體。Next, the lightly peelable release sheet is peeled from the second layered body to expose the exposed surface of the coating layer, and the third lightly peelable release sheet with a coating layer is bonded to the coated layer side surface to obtain a heavy A third layered body formed by a peelable peeling sheet and a light peeling peeling sheet sandwiching a coating layer with a total thickness of about 200 μm.
接著,對於從上述第3積層體剝離輕剝離型剝離片而露出塗佈層的露出面,貼合第4帶有塗佈層的輕剝離型剝離片的塗佈層側的面,得到由重剝離型剝離片及輕剝離型剝離片夾住、總計厚度約250μm的塗佈層所形成之第4積層體。Next, the lightly peelable release sheet is peeled from the third laminate to expose the exposed surface of the coating layer, and the surface of the fourth lightly peelable release sheet with a coating layer on the coating layer side is bonded to obtain the A fourth laminate formed by a peelable release sheet and a lightly peelable release sheet sandwiching a coating layer with a total thickness of about 250 μm.
將上述第4積層體在23℃、50%RH條件下熟化7日,製作由重剝離型剝離片/黏著劑層(厚度:250μm)/輕剝離型剝離片的結構所形成的黏著片。The fourth layered body was aged for 7 days under the conditions of 23° C. and 50% RH to produce an adhesive sheet having a structure of a heavy peeling type release sheet/adhesive layer (thickness: 250 μm)/light peeling type release sheet.
又,上述黏著劑層的厚度為根據JIS K7130,使用定壓厚度測量器(TECLOCK社製,製品名「PG-02」)測量之值。In addition, the thickness of the adhesive layer is a value measured in accordance with JIS K7130 using a constant pressure thickness measuring device (manufactured by TECLOCK, product name "PG-02").
[實施例2~6,比較例1~3] 將構成(甲基)丙烯酸酯聚合物(A)的單體種類及比例、(甲基)丙烯酸酯聚合物(A)的重量平均分子量(Mw)、交聯劑(B) 的種類及調配量、矽烷偶合劑的調配量、以及黏著劑層的厚度,如表1所示的變更外,其餘同實施例1製造黏著片。又,在實施例3及比較例2,經由改變形成於輕剝離型剝離片上的塗佈層的積層數而改變黏著劑層的厚度。[Examples 2~6, Comparative Examples 1~3] The type and ratio of monomers constituting the (meth)acrylate polymer (A), the weight average molecular weight (Mw) of the (meth)acrylate polymer (A), and the type and amount of crosslinking agent (B) , The blending amount of the silane coupling agent and the thickness of the adhesive layer are the same as those in Example 1 except for the changes shown in Table 1. In addition, in Example 3 and Comparative Example 2, the thickness of the adhesive layer was changed by changing the number of layers of the coating layer formed on the light-peelable release sheet.
此處,上述重量平均分子量(Mw)為使用凝膠滲透層析(GPC)法以下列條件測量(GPC測量)的聚苯乙烯換算的重量平均分子量。 >測量條件> •測量裝置: TOSOH社製,HLC-8320 •GPC管柱(通過下列順序): TOSOH社製 TSK gel superH-H TSK gel superHM-H TSK gel superH2000 •測量溶劑:四氫呋喃 •測量溫度: 40℃Here, the above-mentioned weight average molecular weight (Mw) is a weight average molecular weight in terms of polystyrene measured (GPC measurement) using a gel permeation chromatography (GPC) method under the following conditions. >Measurement conditions> •Measuring device: TOSOH Corporation, HLC-8320 •GPC string (through the following sequence): TOSOH Corporation TSK gel superH-H TSK gel superHM-H TSK gel superH2000 •Measuring solvent: tetrahydrofuran •Measuring temperature: 40℃
[試驗例1] (凝膠分率的測量) 將實施例及比較例所得到的黏著片裁成80mm×80mm的尺寸,將該黏著劑層包裹於聚酯製網(網孔大小200),在精密天平上秤量其質量,減去上述網的單獨質量,計算出只有黏著劑的質量。此時記為質量M1。[Test Example 1] (Measurement of Gel Fraction) The adhesive sheets obtained in the Examples and Comparative Examples were cut into a size of 80mm×80mm, the adhesive layer was wrapped in a polyester mesh (mesh size 200), and the mass was weighed on a precision balance, minus the weight of the above-mentioned mesh Separate the mass, calculate the mass of only the adhesive. At this time, it is recorded as mass M1.
接著,將包裹於上述聚酯製網的黏著劑在室溫下(23℃)浸漬在乙酸乙酯24小時。之後取出黏著劑,在溫度23℃、相對濕度50%的環境下,風乾24小時,再於80℃烤箱中乾燥12小時。乾燥後,在精密天平上秤量其質量,減去上述網的單獨質量,計算出只有黏著劑的質量。此時記為質量M2。凝膠分率(%)以(M2/M1)×100表示。結果如表2所示。Next, the adhesive wrapped in the polyester mesh was immersed in ethyl acetate at room temperature (23°C) for 24 hours. After that, take out the adhesive and dry it in the air for 24 hours at a temperature of 23°C and a relative humidity of 50%, and then dry it in an oven at 80°C for 12 hours. After drying, weigh its mass on a precision balance and subtract the individual mass of the above net to calculate the mass of only the adhesive. At this time, it is recorded as mass M2. Gel fraction (%) is expressed as (M2/M1)×100. The results are shown in Table 2.
[試驗例2] (儲存模數的測量)
從實施例及比較例所得到的黏著片剝離剝離片,積層複數層黏著劑層以成為厚度3mm。從所得的黏著劑層的積層體沖裁直徑8mm的圓柱體(高度3mm),將此做為樣本。[Test Example 2] (Measurement of Storage Modulus)
The release sheet was peeled off from the adhesive sheets obtained in the Examples and Comparative Examples, and a plurality of adhesive layers were laminated so as to have a thickness of 3 mm. A cylinder with a diameter of 8 mm (
對於上述樣本,根據JIS K7244-6,使用黏彈性測量裝置(Physica社製,製品名「MCR300」),以扭轉剪切試驗在下列條件測量在23℃及50℃的儲存模數(MPa)。結果如表2所示。 測量頻率:1Hz 測量溫度: 23℃、50℃For the above-mentioned samples, according to JIS K7244-6, using a viscoelasticity measuring device (manufactured by Physica, product name "MCR300"), the storage modulus (MPa) at 23°C and 50°C was measured under the following conditions by a torsion shear test. The results are shown in Table 2. Measuring frequency: 1Hz Measuring temperature: 23℃, 50℃
[試驗例3] (黏著力的測量) 從實施例及比較例所得的黏著片,剝離輕剝離型剝離片,露出的黏著劑層和具有易接著層的聚對苯二甲酸乙二酯(PET)薄膜(東洋紡社製,製品名「PET A4300」,厚度:100μm)的易接著層貼合,得到剝離片/黏著劑層/PET薄膜的積層體。將所得的積層體裁切成寬25mm、長100mm,將此做為樣本。[Test Example 3] (Measurement of Adhesion) From the adhesive sheets obtained in the Examples and Comparative Examples, the light-peelable release sheet was peeled, and the exposed adhesive layer and a polyethylene terephthalate (PET) film with an easy-adhesive layer (manufactured by Toyobo Co., Ltd., product name "PET) A4300", thickness: 100μm) easy-to-adhesive layer was attached to obtain a laminate of release sheet/adhesive layer/PET film. The obtained laminate was cut into a width of 25 mm and a length of 100 mm, and this was used as a sample.
在23℃、50%RH環境下,從上述樣本剝離重剝離型剝離片,將露出的黏著劑層貼附在鈉鈣玻璃(日本板硝子社製)之後,在栗原製作所社製的滅菌釜,以0.5MPa、50℃加壓20分鐘。之後,在23℃、50%RH條件下放置24小時,或在50℃、50%RH條件下放置6小時。In an environment of 23°C and 50%RH, the heavy-peelable release sheet was peeled from the above sample, and the exposed adhesive layer was attached to soda lime glass (manufactured by Nippon Sheet Glass Co., Ltd.), and then used in a sterilization autoclave manufactured by Kurihara Manufacturing Co., Ltd. Press 0.5MPa and 50°C for 20 minutes. After that, it was left at 23°C and 50%RH for 24 hours, or at 50°C and 50%RH for 6 hours.
之後,在和上述條件相同的環境下(23℃・50%RH/50℃・50%RH),使用拉伸試驗機(ORIENTEC社製,製品名「Tensilon」),在剝離速度300mm/min、剝離角度180度的條件,測量在23℃及50℃的黏著力(N/25mm)。此處記載以外的條件根據JIS Z0237:2009進行測量。結果如表2所示。After that, under the same environment as the above conditions (23℃・50%RH/50℃・50%RH), using a tensile testing machine (manufactured by ORIENTEC, product name "Tensilon"), at a peeling speed of 300mm/min, Under the condition of a peeling angle of 180 degrees, the adhesive force (N/25mm) at 23°C and 50°C was measured. Conditions other than those described here are measured in accordance with JIS Z0237:2009. The results are shown in Table 2.
[試驗例4] (埋入性的評估) 準備2片剝離片夾住丙烯酸類的黏著劑層(厚度25μm)所形成的黏著片(Lintech社製,製品名「MO-T015C」),剝離一方的剝離片。將露出的黏著劑層和具有易接著層的PET薄膜(東洋紡社製,製品名「PET A4300」,厚度:75μm)的易接著層貼合,得到剝離片/黏著劑層/PET薄膜的積層體。所得的積層體裁切成寬1mm、長70mm,做為黏著膠帶,製作複數個該黏著膠帶。[Test Example 4] (Evaluation of Implantability) An adhesive sheet (manufactured by Lintech, product name "MO-T015C") formed by sandwiching an acrylic adhesive layer (thickness 25 μm) between two release sheets was prepared, and one release sheet was peeled off. The exposed adhesive layer and an easy-adhesive layer of PET film (manufactured by Toyobo Co., Ltd., product name "PET A4300", thickness: 75μm) with an easy-adhesive layer were bonded together to obtain a laminate of release sheet/adhesive layer/PET film . The obtained laminate was cut into a width of 1 mm and a length of 70 mm, and used as an adhesive tape, and a plurality of the adhesive tapes were produced.
從上述黏著膠帶剝離另一方的剝離片,將露出黏著劑層的複數個黏著膠帶,以相鄰的黏著膠帶的間隙寬度為5mm、3mm或1mm,貼附於70mm×70mm大小的鈉鈣玻璃(日本板硝子社製),將此等作為被黏著體。Peel off the other release sheet from the above adhesive tape, and attach the multiple adhesive tapes that expose the adhesive layer to a gap width of 5mm, 3mm or 1mm between adjacent adhesive tapes on a 70mm×70mm soda lime glass ( Nippon Sheet Glass Co., Ltd.), these are used as the adherend.
另一方面,從實施例及比較例所得的黏著片,剝離輕剝離型剝離片,將露出的黏著劑層和具有易接著層的PET薄膜(東洋紡社製,製品名「PET A4300」,厚度:50μm)的易接著層貼合,得到剝離片/黏著劑層/PET薄膜的積層體。之後,將此積層體裁成70mm×70mm尺寸。On the other hand, from the adhesive sheets obtained in the Examples and Comparative Examples, the light-peelable release sheet was peeled off, and the exposed adhesive layer and the PET film with the easy-adhesive layer (manufactured by Toyobo Co., Ltd., product name "PET A4300", thickness: 50μm) easy-to-adhesive layer was bonded to obtain a laminate of release sheet/adhesive layer/PET film. After that, the laminated body is cut into a size of 70mm×70mm.
在23℃、50%RH環境下,從上述積層體剝離重剝離型剝離片,露出黏著劑層。接著,使用層壓機(FUJIPLA社製,製品名「LPD3214」),以黏著劑層覆蓋各黏著膠帶地在上述被黏著體積層該積層體,將此等作為評估用樣本。In an environment of 23° C. and 50% RH, the heavy-peelable release sheet was peeled off from the laminate to expose the adhesive layer. Next, using a laminator (manufactured by FUJIPLA, product name "LPD3214"), each adhesive tape was covered with an adhesive layer to layer the laminate on the above-mentioned adhesive volume, and these were used as samples for evaluation.
將所得的評估樣本在50℃、0.5MPa的條件下以滅菌釜處理30分鐘後,在常溫、23℃、50%RH條件下放置24小時。首先在此狀態目視被黏著體和黏著劑層的界面的狀態,根據以下基準評估埋入性(耐久前)。結果如表2所示。 ◎: 無浮起、剝落 ○: 無浮起、剝落,但發生氣泡 ×: 浮起、剝落發生After the obtained evaluation sample was treated in a sterilizer under the conditions of 50° C. and 0.5 MPa for 30 minutes, it was left for 24 hours under the conditions of normal temperature, 23° C. and 50% RH. First, visually observe the state of the interface between the adherend and the adhesive layer in this state, and evaluate the embedding properties (before durability) based on the following criteria. The results are shown in Table 2. ◎: No floating or peeling ○: No floating, peeling, but bubbles ×: Floating, peeling occurs
之後,將上述評估用樣本保管於85℃、85%RH的濕熱條件下72小時(耐久試驗),之後同上述評估埋入性(耐久後)。結果如表2所示。After that, the samples for evaluation were stored under damp heat conditions of 85°C and 85% RH for 72 hours (endurance test), and then the embedding properties were evaluated as described above (after durability). The results are shown in Table 2.
[試驗例5] (全光線透過率的測量) 從實施例及比較例所得的黏著片,剝離輕剝離型剝離片,將露出的黏著劑層和玻璃貼合,將此等作為測量用樣本。在以玻璃進行背景測量上,從上述測量用樣本剝離重剝離型剝離片,露出黏著劑面,在23℃的條件,根據JIS K7361-1:1997,使用霧度計 (日本電色工業社製,製品名「NDH-5000」)測量全光線透過率(耐久前;%)。結果如表3所示。[Test Example 5] (Measurement of total light transmittance) From the adhesive sheets obtained in the examples and comparative examples, the light-peelable release sheet was peeled off, and the exposed adhesive layer and glass were bonded together, and these were used as samples for measurement. In the background measurement with glass, the heavy-peelable release sheet was peeled from the above-mentioned measurement sample to expose the adhesive surface. At 23°C, according to JIS K7361-1:1997, a haze meter (manufactured by Nippon Denshoku Industries, Ltd.) was used. , Product name "NDH-5000") to measure total light transmittance (before durability; %). The results are shown in Table 3.
之後,將上述測量用樣本保管於50℃、50%RH的高溫條件下500小時(耐熱試驗),之後同上述測量全光線透過率(耐熱試驗後;%)。結果如表3所示。After that, the measurement sample was stored under high temperature conditions of 50°C and 50%RH for 500 hours (heat resistance test), and then the total light transmittance was measured as described above (after heat resistance test; %). The results are shown in Table 3.
另一方面,將上述測量用樣本投入耐光性試驗機(SUGA試験機社製,製品名「紫外線FADE METER U48」,光源:碳弧燈),從重剝離型剝離片側照射紫外線 (照度:500mW/m2 ) 500小時。之後,同上述測量全光線透過率(耐光試驗後;%)。結果如表3所示。On the other hand, the above-mentioned sample for measurement was put into a light resistance tester (manufactured by SUGA Test Equipment Co., Ltd., product name "Ultraviolet FADE METER U48", light source: carbon arc lamp), and ultraviolet light was irradiated from the side of the heavy peeling peeling sheet (illuminance: 500mW/m 2 ) 500 hours. After that, measure the total light transmittance as above (after light resistance test; %). The results are shown in Table 3.
[試驗例6] (霧度值的測量) 從實施例及比較例所得的黏著片,剝離輕剝離型剝離片,將露出的黏著劑層和玻璃貼合,將此等作為測量用樣本。在以玻璃進行背景測量上,從上述測量用樣本剝離重剝離型剝離片,露出黏著劑面,在23℃的條件,根據JIS K7136:2000,使用霧度計 (日本電色工業社製,製品名「NDH-5000」)測量霧度值(耐久前:%)。結果如表3所示。[Test Example 6] (Measurement of Haze Value) From the adhesive sheets obtained in the examples and comparative examples, the light-peelable release sheet was peeled off, and the exposed adhesive layer and glass were bonded together, and these were used as samples for measurement. In the background measurement with glass, the heavy-peelable release sheet was peeled from the above-mentioned measurement sample to expose the adhesive surface. At 23°C, according to JIS K7136:2000, a haze meter (manufactured by Nippon Denshoku Kogyo Co., Ltd.) was used. Name "NDH-5000") to measure the haze value (before durability: %). The results are shown in Table 3.
之後,將上述測量用樣本保管於50℃、50%RH的高溫條件下500小時(耐熱試驗),之後同上述測量霧度值(耐熱試驗後;%)。結果如表3所示。After that, store the above-mentioned sample for measurement under high temperature conditions of 50°C and 50%RH for 500 hours (heat resistance test), and then measure the haze value as described above (after heat resistance test; %). The results are shown in Table 3.
另一方面,將上述測量用樣本投入耐光性試驗機(SUGA試験機社製,製品名「紫外線FADE METER U48」,光源:碳弧燈),從重剝離型剝離片側照射紫外線(照度:500mW/m2 ) 500小時。之後,同上述測量霧度值(耐光試驗後;%)。結果如表3所示。On the other hand, the above-mentioned sample for measurement was put into a light resistance tester (manufactured by SUGA Test Equipment Co., Ltd., product name "Ultraviolet FADE METER U48", light source: carbon arc lamp), and ultraviolet light was irradiated from the side of the heavy peeling peeling sheet (illuminance: 500mW/m 2 ) 500 hours. After that, measure the haze value as above (after light resistance test; %). The results are shown in Table 3.
[試驗例7] (L*a*b*的測量) 對實施例及比較例所得的黏著片的黏著劑層,使用同時測光分光式色度計(日本電色工業社製,製品名「SQ2000」),測量CIE1976L*a*b*表色系所規定的色度a*和色度b*(耐久前)。結果如表3所示。[Test Example 7] (Measurement of L*a*b*) For the adhesive layer of the adhesive sheets obtained in the Examples and Comparative Examples, a simultaneous photometric spectrophotometer (manufactured by Nippon Denshoku Kogyo Co., Ltd., product name "SQ2000") was used to measure the CIE1976L*a*b* color system. Chroma a* and chroma b* (before endurance). The results are shown in Table 3.
之後,將上述黏著片保管於50℃、50%RH的高溫條件下500小時(耐熱試驗),之後同上述測量色度a*和色度b* (耐熱試驗後)。結果如表3所示。After that, the above-mentioned adhesive sheet was stored under high temperature conditions of 50°C and 50%RH for 500 hours (heat resistance test), and then the chromaticity a* and chromaticity b* were measured as above (after the heat resistance test). The results are shown in Table 3.
另一方面,將上述黏著片投入耐光性試驗機(SUGA試験機社製,製品名「紫外線FADE METER U48」,光源:碳弧燈),從重剝離型剝離片側照射紫外線 (照度:500mW/m2 ) 500小時。之後,同上述測量色度a*和色度b* (耐光試驗後)。結果如表3所示。On the other hand, the above-mentioned adhesive sheet was put into a light resistance tester (manufactured by SUGA Test Equipment Co., Ltd., product name "Ultraviolet FADE METER U48", light source: carbon arc lamp), and ultraviolet light was irradiated from the side of the heavy peeling peeling sheet (illuminance: 500mW/m 2 ) 500 hours. After that, measure the chromaticity a* and the chromaticity b* as above (after the light resistance test). The results are shown in Table 3.
[試驗例8] (殘餘單體量的測量) 從實施例及比較例所得的黏著片各自分離出黏著劑0.02g,將該黏著劑投入容量22mL的小玻璃瓶,在120℃維持30分鐘。之後,使用頂空進樣器(headspace sampler)(PerkinElmer 社製,製品名「Turbomatrix 40」),將小玻璃瓶中的氣相成分導入氣相層析柱(Hewlett-Packard社製,製品名「6890型」),進行成分分析。又,分離柱使用Hewlett-Packard社製的HP-5。結果確認,在任一例的黏著劑中,殘餘單體量皆少於0.1質量%。[Test Example 8] (Measurement of Residual Monomer Amount) 0.02 g of the adhesive was separated from the adhesive sheets obtained in the Examples and Comparative Examples, and the adhesive was put into a 22 mL vial, and maintained at 120°C for 30 minutes. After that, using a headspace sampler (manufactured by PerkinElmer, product name "Turbomatrix 40"), the gas phase components in the vial were introduced into the gas chromatography column (manufactured by Hewlett-Packard, product name " Type 6890"), and perform component analysis. In addition, HP-5 manufactured by Hewlett-Packard was used as the separation column. The results confirmed that the amount of residual monomers was less than 0.1% by mass in the adhesive of any example.
[表1]
[表2]
[表3]
由表2可知,實施例所得的黏著片在耐久試驗前及耐久試驗後皆埋入性優良。從表3可知,實施例所得的黏著片在耐久試驗前、耐熱試驗後及耐光試驗後皆無色透明性的程度高。 [產業可利用性]It can be seen from Table 2 that the adhesive sheets obtained in the examples have excellent embedding properties before and after the durability test. It can be seen from Table 3 that the adhesive sheets obtained in the examples have a high degree of colorlessness and transparency before the durability test, after the heat resistance test, and after the light resistance test. [Industry Availability]
本發明之背光貼附用黏著片及背光單元,可適宜使用於例如利用直下型背光的液晶顯示裝置。The adhesive sheet and backlight unit for attaching a backlight of the present invention can be suitably used in, for example, a liquid crystal display device using a direct type backlight.
1:背光貼附用黏著片
11:黏著劑層
12a,12b:剝離片
2:背光單元
20:背光
21:基板
22:發光體
3:液晶顯示裝置
31:擴散元件
32:液晶面板1: Adhesive sheet for backlight attachment
11:
第1圖為本發明之一實施態樣之背光貼附用黏著片之剖面圖。 第2圖為本發明之一實施態樣之背光單元之剖面圖。 第3圖為本發明之一實施態樣之液晶顯示裝置之剖面圖。Figure 1 is a cross-sectional view of an adhesive sheet for backlight attachment according to an embodiment of the present invention. Figure 2 is a cross-sectional view of a backlight unit according to an embodiment of the present invention. Figure 3 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention.
1:背光貼附用黏著片 1: Adhesive sheet for backlight attachment
11:黏著劑層 11: Adhesive layer
12a,12b:剝離片 12a, 12b: peeling sheet
Claims (6)
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CN113985657A (en) * | 2021-10-28 | 2022-01-28 | 深圳Tcl新技术有限公司 | Backlight module, preparation method thereof and display device |
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JP2007059386A (en) | 2005-07-26 | 2007-03-08 | Cosmo Tec:Kk | Backlight structure and double-sided adhesive tape sheet |
JP4228026B2 (en) * | 2007-02-28 | 2009-02-25 | 日東電工株式会社 | Backlight system and optical sheet with adhesive |
JP4782183B2 (en) * | 2007-02-28 | 2011-09-28 | 日東電工株式会社 | Backlight system and optical sheet with adhesive |
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