TWI605286B - Set of polarizing plates and liquid crystal display panel - Google Patents

Set of polarizing plates and liquid crystal display panel Download PDF

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TWI605286B
TWI605286B TW105139651A TW105139651A TWI605286B TW I605286 B TWI605286 B TW I605286B TW 105139651 A TW105139651 A TW 105139651A TW 105139651 A TW105139651 A TW 105139651A TW I605286 B TWI605286 B TW I605286B
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polarizing plate
film
liquid crystal
adhesive
crystal cell
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TW105139651A
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TW201727335A (en
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松本寿和
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住友化學股份有限公司
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    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • 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
    • 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
    • G02F1/133528—Polarisers

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Description

偏光板之套組及液晶面板 Polarizer set and LCD panel

本發明係關於在高溫環境下抑制液晶面板的翹曲之偏光板之套組及使用其之液晶面板。 The present invention relates to a set of polarizing plates for suppressing warpage of a liquid crystal panel in a high temperature environment and a liquid crystal panel using the same.

近年，消耗電力低、以低電壓動作、輕量且薄型的液晶顯示器，急速地普及作為手機、攜帶式資訊終端、電腦用之監視器、電視等資訊用顯示裝置。隨液晶技術的發展，已提出各種模式的液晶顯示器，持續解決如應答速度、對比、窄視角的液晶顯示器之問題點。而且，隨手機用液晶顯示器的普及，液晶面板也被要求薄且輕者。 In recent years, liquid crystal displays that consume low power, operate at low voltage, and are lightweight and thin have been rapidly popularized as display devices for information such as mobile phones, portable information terminals, monitors for computers, and televisions. With the development of liquid crystal technology, various modes of liquid crystal displays have been proposed, which continuously solve problems of liquid crystal displays such as response speed, contrast, and narrow viewing angle. Moreover, with the popularity of liquid crystal displays for mobile phones, liquid crystal panels are also required to be thin and light.

伴隨液晶面板的薄型化，在高溫環境下由於貼合於液晶胞的偏光板之收縮，液晶面板翹曲，致有無法收納於最終製品的機殼等之問題。 With the reduction in thickness of the liquid crystal panel, the liquid crystal panel warps due to shrinkage of the polarizing plate bonded to the liquid crystal cell in a high-temperature environment, and there is a problem that it cannot be accommodated in the casing of the final product.

為了抑制如此的液晶顯示面板的翹曲，從以前即已開發出藉由改變配置於液晶胞的觀看側及與液晶胞的觀看側為相反側(背面側)之偏光板的厚度，抑制液晶顯示面板的翹曲之手段。例如，於日本特開2012-58429號公報(專利文獻1)，已記載藉由使配置於液晶胞的觀看側之 偏光膜(本發明中所謂的偏光膜)的厚度，比配置於液晶胞的背面側之偏光膜更薄，抑制液晶顯示面板的翹曲之方法。 In order to suppress the warpage of such a liquid crystal display panel, it has been previously developed to suppress the liquid crystal display by changing the thickness of the polarizing plate disposed on the viewing side of the liquid crystal cell and on the opposite side (back side) from the viewing side of the liquid crystal cell. The means of warping the panel. For example, Japanese Laid-Open Patent Publication No. 2012-58429 (Patent Document 1) discloses that the viewing side is disposed on the viewing side of the liquid crystal cell. The thickness of the polarizing film (the polarizing film in the present invention) is thinner than that of the polarizing film disposed on the back side of the liquid crystal cell, and the method of suppressing warpage of the liquid crystal display panel.

而且，於日本特開2013-37115號公報(專利文獻2)，係已揭示於觀看側的光學積層體所含的偏光膜(本發明中所謂的偏光膜)，比配置於與觀看側為相反側的光學積層體所含的偏光膜更厚5μm以上，抑制液晶面板的翹曲之手段。但是，對於液晶面板的翹曲之抑制，改良的空間仍大。 Further, Japanese Laid-Open Patent Publication No. 2013-37115 (Patent Document 2) discloses a polarizing film (a polarizing film in the present invention) included in an optical layered body on the viewing side, which is disposed opposite to the viewing side. The polarizing film contained in the optical laminate of the side is thicker than 5 μm, and means for suppressing warpage of the liquid crystal panel. However, for the suppression of the warpage of the liquid crystal panel, the space for improvement is still large.

[先前技術文獻] [Previous Technical Literature] [專利文獻] [Patent Literature]

[專利文獻1]日本特開2012-58429號公報 [Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-58429

[專利文獻2]日本特開2013-37115號公報 [Patent Document 2] Japanese Patent Laid-Open Publication No. 2013-37115

本發明的目的係提供一種在高溫環境下可抑制液晶面板的翹曲之偏光板之套組，以及將該偏光板之套組貼合於液晶胞而成之液晶面板。 An object of the present invention is to provide a liquid crystal panel in which a polarizing plate capable of suppressing warpage of a liquid crystal panel in a high-temperature environment and a set of the polarizing plate are bonded to a liquid crystal cell.

[1]偏光板之套組，其係配置於液晶胞的觀看側之觀看側偏光板、與配置於液晶胞的背面側之背面側偏光板之套組，其中，前述背面側偏光板係具有增亮膜與吸收型偏光板經積層的構成，配置於前述液晶胞的背面側之時，從接 觸前述液晶胞的表面至前述增亮膜的距離為100μm以下，將前述觀看側偏光板於85℃加熱100小時之時的吸收軸方向之尺寸變化率、與將前述背面側偏光板所含的吸收型偏光板於85℃加熱100小時之時的吸收軸方向之尺寸變化率的比為0.62以上且1.25以下。 [1] A set of polarizing plates, which is disposed on a viewing side polarizing plate on a viewing side of a liquid crystal cell, and a set of a back side polarizing plate disposed on a back side of the liquid crystal cell, wherein the back side polarizing plate has When the brightness enhancement film and the absorption type polarizing plate are laminated, when they are disposed on the back side of the liquid crystal cell, the connection is made The distance between the surface of the liquid crystal cell and the brightness enhancement film is 100 μm or less, and the dimensional change rate in the absorption axis direction when the viewing-side polarizing plate is heated at 85° C. for 100 hours and the content of the back surface-side polarizing plate The ratio of the dimensional change ratio in the absorption axis direction when the absorptive polarizing plate was heated at 85 ° C for 100 hours was 0.62 or more and 1.25 or less.

[2]如[1]記載的偏光板之套組，其中，前述觀看側偏光板與前述背面側偏光板係分別具有偏光膜，前述觀看側偏光板具有的偏光膜的厚度、與前述背面側偏光板具有的偏光膜的厚度皆為15μm以下。 [2] The polarizing plate set according to the above aspect, wherein the viewing-side polarizing plate and the back-side polarizing plate each have a polarizing film, and a thickness of the polarizing film of the viewing-side polarizing plate and the back surface side The polarizing film has a polarizing film having a thickness of 15 μm or less.

[3]如[1]或[2]記載的偏光板之套組，其中，前述觀看側偏光板係其吸收軸與前述液晶胞的長邊方向約略平行，前述背面側偏光板係其吸收軸與前述液晶胞的短邊方向約略平行。 [3] The polarizing plate kit according to [1], wherein the viewing-side polarizing plate has an absorption axis that is approximately parallel to a longitudinal direction of the liquid crystal cell, and the back-side polarizing plate is an absorption axis thereof. It is approximately parallel to the short-side direction of the liquid crystal cell.

[4]液晶面板，係包括如[1]至[3]記載的偏光板之套組，其中，將前述觀看側偏光板配置於前述液晶胞的觀看側，將前述背面側偏光板配置於前述液晶胞的背面側，於85℃加熱240小時之時該液晶面板的翹曲量之絕對值為0.5mm以下。 [4] The liquid crystal panel of the polarizing plate according to the above [1], wherein the viewing-side polarizing plate is disposed on a viewing side of the liquid crystal cell, and the back side polarizing plate is disposed on the front side. On the back side of the liquid crystal cell, the absolute value of the warpage amount of the liquid crystal panel when heated at 85 ° C for 240 hours was 0.5 mm or less.

根據本發明，可得到一種可消除液晶面板在高溫環境下的翹曲，且即使在高溫環境下亦可收納於最終製品的機殼之液晶面板。 According to the present invention, it is possible to obtain a liquid crystal panel which can eliminate the warpage of the liquid crystal panel in a high temperature environment and which can be accommodated in the casing of the final product even in a high temperature environment.

30‧‧‧觀看側偏光板 30‧‧‧ viewing side polarizer

31a、31b、51a、51b‧‧‧保護膜 31a, 31b, 51a, 51b‧‧‧ protective film

32、52‧‧‧偏光膜 32, 52‧‧‧ polarizing film

35‧‧‧表面處理層 35‧‧‧Surface treatment layer

33、53‧‧‧黏著劑層 33, 53‧‧‧Adhesive layer

50‧‧‧吸收型偏光板 50‧‧‧Absorbing polarizer

54‧‧‧接著層 54‧‧‧Next layer

60‧‧‧背面側偏光板 60‧‧‧Back side polarizer

61‧‧‧增亮膜 61‧‧‧Brightening film

第1圖係表示關於本發明的偏光板之套組的較佳的層 構成之例的剖面示意圖。 Figure 1 is a view showing a preferred layer of the set of polarizing plates of the present invention. A schematic cross-sectional view of a configuration example.

第2圖係表示關於本發明的偏光板之套組的較佳的層構成之例的剖面示意圖。 Fig. 2 is a schematic cross-sectional view showing an example of a preferable layer configuration of a kit of polarizing plates of the present invention.

第3圖係表示關於本發明的偏光板之套組的較佳的層構成之例的剖面示意圖。 Fig. 3 is a schematic cross-sectional view showing an example of a preferred layer constitution of a set of polarizing plates of the present invention.

第4圖係表示本發明所使用的反射偏光膜的一例之示意圖。 Fig. 4 is a view showing an example of a reflective polarizing film used in the present invention.

以下，使用適合的圖面，說明關於本發明的偏光板之套組及使用其之液晶面板，但本發明不限於該等實施態樣。 Hereinafter, the kit of the polarizing plate of the present invention and the liquid crystal panel using the same will be described using a suitable drawing, but the present invention is not limited to the embodiments.

本發明的偏光板之套組，係由觀看側偏光板30與背面側偏光板60所構成。 The kit of polarizing plates of the present invention is composed of a viewing-side polarizing plate 30 and a back-side polarizing plate 60.

參考第1圖，說明關於本發明的觀看側偏光板30與背面側偏光板60的層構成。於第1圖中，觀看側偏光板30係於偏光膜32的兩面分別貼合有保護膜31a、31b者。保護膜31a之與偏光膜32的貼合面為相反側的面，也可使用形成表面處理層者。關於背面側偏光板60，於本發明中，吸收型偏光板50係於偏光膜52的至少一面具有保護膜，如第1圖所示，亦可於偏光膜52的兩面貼合保護膜51a、51b而形成。再者，隔著接著層54，於吸收型偏光板50積層增亮膜61，形成背面側偏光板60。該等偏光板分別隔著黏著劑層33、53而貼合於液晶胞，形成液晶面板。 The layer configuration of the viewing-side polarizing plate 30 and the back-side polarizing plate 60 of the present invention will be described with reference to Fig. 1 . In the first embodiment, the viewing-side polarizing plate 30 is bonded to the protective film 31a and 31b on both surfaces of the polarizing film 32. The surface on which the protective film 31a and the polarizing film 32 are bonded to each other may be the opposite side, and a surface-treated layer may be used. In the present invention, the absorptive polarizing plate 50 has a protective film on at least one surface of the polarizing film 52. As shown in FIG. 1, the protective film 51a may be bonded to both surfaces of the polarizing film 52, Formed by 51b. Further, the brightness enhancement film 61 is laminated on the absorption type polarizing plate 50 via the adhesive layer 54 to form the back side polarizing plate 60. The polarizing plates are bonded to the liquid crystal cells via the adhesive layers 33 and 53, respectively, to form a liquid crystal panel.

於前述背面側偏光板中，從液晶胞至增亮 膜61的距離為100μm以下，以90μm以下較佳，以80μm以下為更佳，亦可為60μm以下。下限無特別限制，但通常為5μm以上，更典型地為10μm以上。而且，前述觀看側偏光板30於85℃加熱100小時之時的吸收軸方向之尺寸變化率、與前述背面側偏光板所含的吸收型偏光板50於85℃加熱100小時之時的吸收軸方向之尺寸變化率的比為0.62以上1.25以下，以0.65以上1.2以下較佳，以0.75以上1.15以下更佳。再者，於本發明中，所謂從液晶胞至增亮膜的距離，係指從背面側偏光板之與前述液晶胞相接的面(例於如第1至3圖，相當於黏著劑層53之相接於液晶胞的面)至增亮膜之液晶胞側的面為止的距離。 In the foregoing back side polarizing plate, from the liquid crystal cell to brightening The distance of the film 61 is 100 μm or less, preferably 90 μm or less, more preferably 80 μm or less, or 60 μm or less. The lower limit is not particularly limited, but is usually 5 μm or more, and more typically 10 μm or more. In addition, the dimensional change rate in the absorption axis direction when the viewing-side polarizing plate 30 is heated at 85 ° C for 100 hours, and the absorption axis when the absorption-type polarizing plate 50 included in the back-side polarizing plate is heated at 85 ° C for 100 hours The ratio of the dimensional change ratio of the direction is 0.62 or more and 1.25 or less, preferably 0.65 or more and 1.2 or less, more preferably 0.75 or more and 1.15 or less. In the present invention, the distance from the liquid crystal cell to the brightness enhancement film means a surface which is in contact with the liquid crystal cell from the back side polarizing plate (for example, as shown in Figs. 1 to 3, which corresponds to an adhesive layer). The distance from the surface of the liquid crystal cell of 53 to the surface of the liquid crystal cell side of the brightness enhancement film.

液晶面板的翹曲量係配置於液晶胞最外層的增亮膜之影響大。因此，液晶面板與增亮膜的距離滿足上述，進而，使觀看側偏光板30及前述背面側偏光板所含的吸收型偏光板50於85℃加熱100小時之時的吸收軸方向之尺寸變化率為上述之範圍，可減少液晶面板的翹曲量。 The amount of warpage of the liquid crystal panel is largely affected by the brightness enhancement film disposed on the outermost layer of the liquid crystal cell. Therefore, the distance between the liquid crystal panel and the brightness enhancement film satisfies the above, and the dimensional change in the absorption axis direction when the absorption-type polarizing plate 50 included in the viewing-side polarizing plate 30 and the back-side polarizing plate is heated at 85 ° C for 100 hours. The rate is as described above, and the amount of warpage of the liquid crystal panel can be reduced.

如第2、3圖所示，於本發明中，使增亮膜更靠近液晶胞，故於前述背面側偏光板60所含的吸收型偏光板50係只在偏光膜的單面具有保護膜也為較佳的構成。如此，藉由將增亮膜配置在更靠近液晶胞的位置，可使因增亮膜的尺寸變化所產生的力對液晶面板的翹曲造成的影響減少。 As shown in the second and third embodiments, in the present invention, since the brightness enhancement film is brought closer to the liquid crystal cell, the absorption type polarizing plate 50 included in the back side polarizing plate 60 has a protective film only on one side of the polarizing film. It is also a preferred composition. Thus, by arranging the brightness enhancement film at a position closer to the liquid crystal cell, the influence of the force generated by the change in the size of the brightness enhancement film on the warpage of the liquid crystal panel can be reduced.

再者，前述觀看側偏光板係其吸收軸與前述液晶胞的長邊方向約略平行，前述背面側偏光板係採取 其吸收軸與前述液晶胞的短邊方向約略平行之配置為較佳。所謂約略平行係指不限於嚴謹地平行，而例如偏光板的吸收軸與液晶胞的各邊所構成的角度為5°以下較佳，以3°以下更佳，以1°以下更加佳。採用如此的軸構成時，可更顯著地減少液晶面板的翹曲。 Further, in the viewing-side polarizing plate, the absorption axis is approximately parallel to the longitudinal direction of the liquid crystal cell, and the back side polarizing plate is taken The arrangement in which the absorption axis is approximately parallel to the short side direction of the liquid crystal cell is preferable. The term "parallel parallel" is not limited to being strictly parallel. For example, the angle formed by the absorption axis of the polarizing plate and the sides of the liquid crystal cell is preferably 5 or less, more preferably 3 or less, and still more preferably 1 or less. When such a shaft is used, the warpage of the liquid crystal panel can be more significantly reduced.

而且，若根據本發明，也可提供上述觀看側偏光板30及背面側偏光板60隔著黏著劑層而積層於液晶胞之液晶面板。 Further, according to the present invention, it is also possible to provide the liquid crystal panel in which the viewing-side polarizing plate 30 and the back-side polarizing plate 60 are laminated on the liquid crystal cell via the adhesive layer.

以下，詳細地說明有關構成本發明的偏光板之套組及液晶面板的構件。而且，總稱觀看側偏光板具有的偏光膜32及背面側偏光板具有的偏光膜52，有時只稱為偏光膜，總稱保護膜31a、保護膜31b、保護膜51a、保護膜51b，有時只稱為保護膜。 Hereinafter, the members constituting the kit of the polarizing plate of the present invention and the liquid crystal panel will be described in detail. In addition, the polarizing film 32 of the viewing-side polarizing plate and the polarizing film 52 of the back-side polarizing plate are collectively referred to as a polarizing film, and are collectively referred to as a protective film 31a, a protective film 31b, a protective film 51a, and a protective film 51b. Just called a protective film.

[偏光膜32、52] [Polarizing film 32, 52]

作為偏光膜32、52，只要滿足前述尺寸變化率及偏光膜的厚度，可使用任意適合者。偏光膜通常經過如下之步驟來製造：單軸延伸聚乙烯醇系樹脂膜的步驟、藉由二色性色素將聚乙烯醇系樹脂膜染色而使二色性色素吸附的步驟、吸附有二色性色素的聚乙烯醇系樹脂膜用硼酸水溶液處理的步驟及藉由硼酸水溶液之交聯處理後進行水洗的步驟。 As the polarizing films 32 and 52, any suitable size may be used as long as the dimensional change ratio and the thickness of the polarizing film are satisfied. The polarizing film is usually produced by a step of uniaxially stretching a polyvinyl alcohol-based resin film, a step of dyeing a polyvinyl alcohol-based resin film by a dichroic dye to adsorb a dichroic dye, and adsorbing two colors. The step of treating the polyvinyl alcohol-based resin film of the dye with a boric acid aqueous solution and the step of washing with water by a cross-linking treatment with an aqueous boric acid solution.

聚乙烯醇系樹脂係可藉由聚乙酸乙烯酯系樹脂皂化而製造。聚乙酸乙烯酯系樹脂除了乙酸乙烯酯的均聚物之聚乙酸乙烯酯外，亦可為乙酸乙烯酯及可與其共 聚合之其他單體的共聚物。作為可與乙酸乙烯酯共聚合之其他單體，可舉例如不飽和羧酸、烯烴、乙烯醚、不飽和磺酸、具有銨基的丙烯醯胺等。 The polyvinyl alcohol-based resin can be produced by saponification of a polyvinyl acetate-based resin. The polyvinyl acetate resin may be vinyl acetate and may be co-polymerized in addition to the polyvinyl acetate of the homopolymer of vinyl acetate. A copolymer of other monomers polymerized. Examples of the other monomer copolymerizable with vinyl acetate include an unsaturated carboxylic acid, an olefin, a vinyl ether, an unsaturated sulfonic acid, and an acrylamide having an ammonium group.

聚乙烯醇系樹脂的皂化度通常為85至100莫耳%左右，較佳為98莫耳%以上。聚乙烯醇系樹脂可被改質，例如也可使用以醛類改質的聚乙烯縮甲醛、聚乙烯縮乙醛等。聚乙烯醇系樹脂的聚合度，通常為1,000至10,000，較佳為1,500至5,000左右。 The degree of saponification of the polyvinyl alcohol-based resin is usually from about 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin can be modified. For example, polyvinyl formal or acetal modified with an aldehyde can also be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually from 1,000 to 10,000, preferably from about 1,500 to 5,000.

將如此的聚乙烯醇系樹脂製膜者，可使用作為偏光膜的胚膜。將聚乙烯醇系樹脂製膜的方法，無特別限制，可以習知的方法製膜。聚乙烯醇系樹脂的胚膜的膜厚，例如為10至100μm左右，較佳為10至50μm左右。 A film made of such a polyvinyl alcohol-based resin can be used as a polarizing film. The method of forming a film of a polyvinyl alcohol-based resin is not particularly limited, and a film can be formed by a known method. The film thickness of the germ film of the polyvinyl alcohol-based resin is, for example, about 10 to 100 μm, preferably about 10 to 50 μm.

聚乙烯醇系樹脂膜的縱向單軸延伸，可在藉由以二色性色素進行染色之前、與染色同時、或染色後進行。使縱向單軸延伸在染色後進行的情況，該縱向單軸延伸可在硼酸處理前進行、或硼酸處理中進行。當然，亦可在此處所示的複數階段進行縱向單軸延伸。於縱向單軸延伸係可採用在轉速不同的滾輪間進行單軸延伸的方法，或使用熱滾輪進行單軸延伸的方法等。而且，縱向單軸延伸可為藉由在大氣中進行延伸的乾式延伸來進行，亦可為使用水等的溶劑，使聚乙烯醇系樹脂膜膨脹的狀態下進行延伸的濕式延伸來進行。延伸倍率通常為3至8倍左右。 The longitudinal uniaxial stretching of the polyvinyl alcohol-based resin film can be carried out before dyeing with a dichroic dye, simultaneously with dyeing, or after dyeing. The longitudinal uniaxial stretching is carried out after dyeing, which can be carried out before the boric acid treatment or in the boric acid treatment. Of course, longitudinal uniaxial stretching can also be performed at the complex stages shown here. The longitudinal uniaxial extension system may be a method of uniaxially extending between rollers having different rotational speeds, or a method of uniaxially extending using a hot roller. In addition, the longitudinal uniaxial stretching may be carried out by dry stretching in the air, or may be carried out by using a solvent such as water to extend the wet stretching of the polyvinyl alcohol resin film in a state of being expanded. The stretching ratio is usually about 3 to 8 times.

聚乙烯醇系樹脂膜以二色性色素進行染色 處理，係例如可藉由將聚乙烯醇系樹脂膜浸漬於含有二色性色素的水溶液中的方法進行。作為二色性色素，具體地可使用碘或二色性有機染料。再者，聚乙烯醇系樹脂膜在染色處理前，預先實施浸漬於水而使其膨脹之處理較佳。 Polyvinyl alcohol resin film dyed with dichroic dye The treatment can be carried out, for example, by immersing the polyvinyl alcohol-based resin film in an aqueous solution containing a dichroic dye. As the dichroic dye, specifically, iodine or a dichroic organic dye can be used. Further, the polyvinyl alcohol-based resin film is preferably subjected to a treatment of immersing in water and expanding it before the dyeing treatment.

使用碘作為二色性色素時，通常採用將聚乙烯醇系樹脂膜浸漬於含有碘及碘化鉀的水溶液中進行染色的方法。 When iodine is used as the dichroic dye, a method in which a polyvinyl alcohol-based resin film is immersed in an aqueous solution containing iodine and potassium iodide is usually used for dyeing.

在該水溶液的碘之含量，水每100重量份，通常為0.01至1重量份左右，碘化鉀的含量，水每100重量份，通常為0.5至20重量份左右。染色所使用的水溶液的溫度，通常為20至40℃左右。而且，對該水溶液的浸漬時間(染色時間)，通常為20至1,800秒左右。 The content of iodine in the aqueous solution is usually about 0.01 to 1 part by weight per 100 parts by weight of water, and the content of potassium iodide is usually about 0.5 to 20 parts by weight per 100 parts by weight of water. The temperature of the aqueous solution used for dyeing is usually about 20 to 40 °C. Further, the immersion time (dyeing time) of the aqueous solution is usually about 20 to 1,800 seconds.

另一方面，於使用二色性有機染料作為二色性色素的情況，通常採用將聚乙烯醇系樹脂膜浸漬於含有水溶性二色性有機染料的水溶液的方法。該水溶液的二色性有機染料的含量，對水每100重量份，通常為1×10-4至10重量份的左右，較佳為1×10-3至1重量份的左右。該水溶液，亦可含有如硫酸鈉的無機鹽，作為染色助劑。染色所使用的二色性有機染料水溶液的溫度，通常為20至80℃的左右。而且，對該水溶液的浸漬時間(染色時間)，通常為10至1,800秒。 On the other hand, when a dichroic organic dye is used as the dichroic dye, a method of immersing the polyvinyl alcohol-based resin film in an aqueous solution containing a water-soluble dichroic organic dye is generally employed. The content of the dichroic organic dye in the aqueous solution is usually about 1 × 10 -4 to 10 parts by weight, preferably about 1 × 10 -3 to 1 part by weight, per 100 parts by weight of water. The aqueous solution may also contain an inorganic salt such as sodium sulfate as a dyeing aid. The temperature of the aqueous solution of the dichroic organic dye used for dyeing is usually about 20 to 80 °C. Moreover, the immersion time (dyeing time) of the aqueous solution is usually 10 to 1,800 seconds.

藉由二色性色素的染色後的硼酸處理，可藉由將染色的聚乙烯醇系樹脂膜浸漬於含有硼酸的水溶液的方法進行。含有硼酸的水溶液的硼酸的含量，對水每100 重量份，通常為2至15重量份的左右，較佳為5至12重量份。於使用碘作為二色性色素的情況，該含有硼酸的水溶液，含有碘化鉀較佳。含有硼酸的水溶液的碘化鉀的含量，對水每100重量份，通常為0.1至15重量份的左右，較佳為5至12重量份。對含有硼酸的水溶液的浸漬時間，通常為60至1,200秒的左右，較佳為150至600秒，更佳為200至400秒。含有硼酸的水溶液的溫度，通常為50℃以上，較佳為50至85℃，更佳為60至80℃。 The boric acid treatment after dyeing of the dichroic dye can be carried out by immersing the dyed polyvinyl alcohol-based resin film in an aqueous solution containing boric acid. The content of boric acid in an aqueous solution containing boric acid, per 100 water The parts by weight are usually about 2 to 15 parts by weight, preferably 5 to 12 parts by weight. In the case where iodine is used as the dichroic dye, the aqueous solution containing boric acid preferably contains potassium iodide. The content of potassium iodide in the aqueous solution containing boric acid is usually from about 0.1 to 15 parts by weight, preferably from 5 to 12 parts by weight, per 100 parts by weight of water. The immersion time for the aqueous solution containing boric acid is usually about 60 to 1,200 seconds, preferably 150 to 600 seconds, more preferably 200 to 400 seconds. The temperature of the aqueous solution containing boric acid is usually 50 ° C or higher, preferably 50 to 85 ° C, more preferably 60 to 80 ° C.

硼酸處理後的聚乙烯醇系樹脂膜，通常進行水洗處理。水洗處理，例如藉由將硼酸處理過的聚乙烯醇系樹脂膜浸漬於水的方法進行。水洗處理的水的溫度，通常為5至40℃的左右。而且，浸漬時間，通常為1至120秒的左右。 The polyvinyl alcohol-based resin film after the boric acid treatment is usually subjected to a water washing treatment. The water washing treatment is carried out, for example, by immersing a boric acid-treated polyvinyl alcohol-based resin film in water. The temperature of the water treated with water is usually about 5 to 40 °C. Moreover, the immersion time is usually about 1 to 120 seconds.

水洗後實施乾燥，得到偏光膜。乾燥處理，可使用熱風乾燥機、遠紅外線加熱器進行。乾燥處理的溫度，通常為30至100℃的左右，較佳為50至80℃。乾燥處理的時間，通常為60至600秒的左右，較佳為120至600秒。藉由乾燥處理，偏光膜中的水分比例減少至實用的左右。該水分比例，通常為5至20重量%，較佳為8至15重量%。水分比例低於5重量%時，偏光膜失去可撓性，偏光膜在乾燥後有損傷、破裂的情況。而且，水分比例高於20重量%時，偏光膜的熱安定性有不足的傾向。 After washing with water, it was dried to obtain a polarizing film. The drying treatment can be carried out using a hot air dryer or a far infrared heater. The temperature of the drying treatment is usually about 30 to 100 ° C, preferably 50 to 80 ° C. The drying treatment time is usually about 60 to 600 seconds, preferably 120 to 600 seconds. By the drying treatment, the proportion of water in the polarizing film is reduced to practical use. The moisture ratio is usually from 5 to 20% by weight, preferably from 8 to 15% by weight. When the moisture ratio is less than 5% by weight, the polarizing film loses flexibility, and the polarizing film may be damaged or broken after drying. Further, when the water content is more than 20% by weight, the thermal stability of the polarizing film tends to be insufficient.

如以上方式，可製造於二色性色素吸附定向於聚乙烯醇系樹脂膜的偏光膜。 As described above, a polarizing film in which a dichroic dye is adsorbed and oriented to a polyvinyl alcohol-based resin film can be produced.

而且，偏光膜的製造步驟中之聚乙烯醇系樹脂膜的延伸、染色、硼酸處理、水洗步驟、乾燥步驟，亦可根據例如特開2012-159778號記載的方法進行。於該文獻記載的方法中，亦可使用藉由對基材膜塗佈聚乙烯醇系樹脂，形成成為偏光膜的聚乙烯醇系樹脂層之方法。 Further, the stretching, dyeing, boric acid treatment, water washing step, and drying step of the polyvinyl alcohol-based resin film in the production step of the polarizing film can be carried out, for example, according to the method described in JP-A-2012-159778. In the method described in this document, a method of forming a polyvinyl alcohol-based resin layer to be a polarizing film by applying a polyvinyl alcohol-based resin to a base film can also be used.

為了抑制偏光膜的收縮力至較低，使偏光板為所期望的尺寸變化率，以偏光膜的厚度為15μm以下較佳，亦可為未達15μm。在可賦予良好的光學特性的點，偏光膜的厚度通常為3μm以上。 In order to suppress the contraction force of the polarizing film to be low, the polarizing plate has a desired dimensional change ratio, and the thickness of the polarizing film is preferably 15 μm or less, and may be less than 15 μm. The thickness of the polarizing film is usually 3 μm or more at a point where good optical characteristics can be imparted.

[保護膜31a、31b、51a、51b] [Protective film 31a, 31b, 51a, 51b]

作為保護膜31a、31b、51a、51b，係可使用由適宜的透明樹脂所形成者。具體地，使用透明性、均勻的光學特性、機械強度、熱安定性等優異的聚合物所構成者為較佳。作為如此的透明樹脂膜，可使用例如三乙醯基纖維素及二乙醯基纖維素等的纖維素系膜、聚對苯二甲酸乙二酯、聚間苯二甲酸乙二酯及聚對苯二甲酸丁二酯等的聚酯系膜、聚(甲基)丙烯酸甲酯及聚(甲基)丙烯酸乙酯等的丙烯酸系膜、聚碳酸酯系膜、聚醚碸系膜、聚碸系膜、聚醯亞胺系膜、聚烯烴系膜、聚降莰烯系膜等，但不限於該等。 As the protective films 31a, 31b, 51a, and 51b, those formed of a suitable transparent resin can be used. Specifically, it is preferred to use a polymer which is excellent in transparency, uniform optical characteristics, mechanical strength, thermal stability, and the like. As such a transparent resin film, for example, a cellulose film such as triethyl fluorenyl cellulose or diethyl fluorenyl cellulose, polyethylene terephthalate, polyethylene isophthalate, and a poly pair can be used. A polyester film such as butyl phthalate, an acrylic film such as poly(methyl) acrylate or poly(methyl) acrylate, a polycarbonate film, a polyether fluorene film, or a polyfluorene A film, a polyimide film, a polyolefin film, a polynormene film, etc. are not limited to these.

適用於觀看側偏光板30之保護膜31a、31b及適用於背面側偏光板60之保護膜51a、51b，分別獨立地可為相同，亦可為不同。 The protective films 31a and 31b which are applied to the viewing-side polarizing plate 30 and the protective films 51a and 51b which are applied to the back-side polarizing plate 60 may be independently the same or different.

上述保護膜係在對偏光膜貼合之前，於其貼合面，可實施皂化處理、電暈處理、底塗處理、錨定塗 佈處理等的易接著處理。保護膜的厚度，通常為5至200μm左右的範圍，較佳為10μm以上，更佳為80μm以下，再更佳為40μm以下。 The protective film may be subjected to saponification treatment, corona treatment, primer treatment, anchor coating on the bonding surface before bonding the polarizing film. Easy processing of cloth processing, etc. The thickness of the protective film is usually in the range of about 5 to 200 μm, preferably 10 μm or more, more preferably 80 μm or less, still more preferably 40 μm or less.

而且，為了賦予所期望的表面光學特性或其他特徵，可於保護膜31a的外面設置塗覆層(表面處理層35)。塗覆層的具體例包括硬塗層、抗眩層、抗反射層、帶電防止層、防污層。形成塗覆層的方法，無特別限制，可使用習知的方法。 Moreover, in order to impart desired surface optical characteristics or other characteristics, a coating layer (surface treatment layer 35) may be provided on the outer surface of the protective film 31a. Specific examples of the coating layer include a hard coat layer, an antiglare layer, an antireflection layer, a charge prevention layer, and an antifouling layer. The method of forming the coating layer is not particularly limited, and a conventional method can be used.

而且，於保護膜31a，亦可使用用以改善通過偏光太陽眼鏡看到畫面時的辨識性之相位差板。從提高辨識性的觀點，期望配置λ/4波長板作為相位差板。而且，與長條上的偏光膜積層時，相對於長條的長邊方向所構成的角度朝約45°或135°延伸時，因可以滾輪對滾輪製作偏光板，故較佳。 Further, a phase difference plate for improving the visibility when the screen is seen through the polarized sunglasses may be used for the protective film 31a. From the viewpoint of improving the visibility, it is desirable to configure a λ/4 wavelength plate as a phase difference plate. Further, when laminating with the polarizing film on the long strip, when the angle formed by the longitudinal direction of the strip is extended to about 45 or 135, the polarizing plate can be formed by the roller to the roller, which is preferable.

液晶胞為橫向電場(IPS：In-Plane Switching)模式的情形，為了不損害該IPS模式液晶胞本來所具有的廣視角特性，保護膜31b及保護膜51b係厚度方向的相位差值Rth為-10至10nm的範圍較佳。而且，面內的相位差值Re也為-10至10nm的範圍較佳。 In the case where the liquid crystal cell is in the IPS (In-Plane Switching) mode, the phase difference Rth of the protective film 31b and the protective film 51b in the thickness direction is - in order not to impair the wide viewing angle characteristics of the IPS mode liquid crystal cell. A range of 10 to 10 nm is preferred. Further, the in-plane phase difference Re is also preferably in the range of -10 to 10 nm.

厚度方向的相位差值Rth，係從面內的平均折射率減去厚度方向的折射率的值乘以膜的厚度所得之值，而以下述式(a)所定義。而且，面內的相位差值Re，係面內的折射率差乘以膜的厚度所得之值，而以下述式(b)所定義。 The phase difference value Rth in the thickness direction is a value obtained by multiplying the value of the refractive index in the thickness direction from the average refractive index in the plane by the thickness of the film, and is defined by the following formula (a). Further, the in-plane phase difference value Re, the value of the refractive index difference in the plane multiplied by the thickness of the film, is defined by the following formula (b).

Rth=[(nx+ny)/2-nz]×d (a) Rth=[(nx+ny)/2-nz]×d (a)

Re=(nx-ny)×d (b) Re=(nx-ny)×d (b)

式中，nx為膜面內的x軸方向(面內延遲軸方向)的折射率，ny為膜面內的y軸方向(面內前進軸方向，在面內與x軸垂直的方向)的折射率，nz為垂直膜面的z軸方向(厚度方向)的折射率，而且，d為膜的厚度。 In the formula, nx is a refractive index in the x-axis direction (in-plane retardation axis direction) in the film plane, and ny is a y-axis direction in the film plane (in-plane forward axis direction, in the plane perpendicular to the x-axis) The refractive index, nz is the refractive index of the vertical film surface in the z-axis direction (thickness direction), and d is the thickness of the film.

此處，相位差值係可為可見光的中心附近的500至650nm左右的範圍下任意波長的值，於說明書，以波長590nm之相位差值作為標準。厚度方向的相位差值Rth及面內的相位差值Re，可使用市售的各種相位差計測定。 Here, the phase difference value may be a value of an arbitrary wavelength in the range of about 500 to 650 nm in the vicinity of the center of visible light, and the phase difference of the wavelength of 590 nm is used as a standard in the specification. The phase difference value Rth in the thickness direction and the phase difference value Re in the plane can be measured using various commercially available phase difference meters.

作為將保護膜的厚度方向的相位差值Rth控制於-10至10nm的範圍內之方法，製作膜時，可舉例如使殘留於面內及厚度方向的扭曲極力地減少的方法。例如於上述溶劑鑄膜法，可採用使乾燥其流延樹脂溶液時所產生的面內及厚度方向的殘留收縮扭曲，藉由熱處理而緩和的方法。另一方面，於上述熔融擠出法中，為了防止樹脂膜從模頭擠出並至冷卻為止之間的延伸，可採用極力地縮短從模頭至冷卻鼓的距離，同時控制擠出量及冷卻鼓的旋轉速度以免膜被延伸的方法等。而且，亦可採用與溶劑鑄膜法相同地，使殘留於所得之膜的扭曲藉由熱處理而緩和的方法。 As a method of controlling the phase difference Rth in the thickness direction of the protective film in the range of -10 to 10 nm, for example, a method of reducing the distortion remaining in the in-plane and thickness directions as much as possible is employed. For example, in the solvent casting film method, a method of relaxing the residual shrinkage in the in-plane and thickness directions which occurs when the resin solution is dried is used, and the method is moderated by heat treatment. On the other hand, in the above melt extrusion method, in order to prevent the elongation of the resin film from the extrusion of the die to the cooling, it is possible to minimize the distance from the die to the cooling drum while controlling the amount of extrusion and The method of cooling the rotation speed of the drum so as not to be stretched. Further, in the same manner as the solvent casting method, a method of relaxing the distortion of the obtained film by heat treatment may be employed.

[增亮膜61] [Brightness film 61]

本發明的背面側偏光板60，係具有增亮膜61與吸收 型偏光板50經積層的構成。作為增亮膜61，代表地可舉例如直線偏光分離型之反射偏光膜。第4圖係表示本發明所使用的反射偏光膜的一例之概略剖面圖。反射偏光膜61係具有雙折射性的層A及實質上不具有雙折射性的層B經交替積層的多層積層體。例如，於圖示的例中，A層的x軸方向的折射率nx比y軸方向的折射率ny更大，B層的x軸方向的折射率nx與y軸方向的折射率ny實質上相同。因此，A層與B層的折射率差，於x軸方向較大，於y軸方向實質上為0。結果，x軸方向成為反射軸，y軸方向成為穿透軸。A層與B層的x軸方向之折射率差，較佳為0.2至0.3。再者，x軸方向係對應於反射偏光膜的延伸方向。 The back side polarizing plate 60 of the present invention has a brightness enhancement film 61 and absorption The polarizing plate 50 is formed by lamination. As the brightness enhancement film 61, for example, a linear polarization separation type reflective polarizing film can be exemplified. Fig. 4 is a schematic cross-sectional view showing an example of a reflective polarizing film used in the present invention. The reflective polarizing film 61 is a multilayer laminated body in which a layer A having birefringence and a layer B having substantially no birefringence are alternately laminated. For example, in the illustrated example, the refractive index nx in the x-axis direction of the layer A is larger than the refractive index ny in the y-axis direction, and the refractive index nx in the x-axis direction of the layer B and the refractive index ny in the y-axis direction are substantially the same. Therefore, the refractive index difference between the A layer and the B layer is large in the x-axis direction and substantially zero in the y-axis direction. As a result, the x-axis direction becomes the reflection axis, and the y-axis direction becomes the transmission axis. The refractive index difference between the A layer and the B layer in the x-axis direction is preferably 0.2 to 0.3. Furthermore, the x-axis direction corresponds to the direction in which the reflective polarizing film extends.

上述A層較佳為以藉由延伸而顯現雙折射性的材料所構成。作為如此的材料的代表例，可舉例如萘二甲酸聚酯(例如聚萘二甲酸乙二酯)、聚碳酸酯及丙烯酸系樹脂(例如甲基丙烯酸甲酯)。以聚萘二甲酸乙二酯為較佳。上述B層較佳為即使延伸，實質上也以不顯現雙折射性的材料所構成。作為如此的材料的代表例，例如萘二甲酸與對苯二甲酸的共聚酯。 The layer A is preferably made of a material which exhibits birefringence by stretching. Typical examples of such a material include a naphthalene dicarboxylic acid polyester (for example, polyethylene naphthalate), a polycarbonate, and an acrylic resin (for example, methyl methacrylate). Polyethylene naphthalate is preferred. It is preferable that the above-mentioned layer B is formed of a material which does not exhibit birefringence substantially even if it extends. As a representative example of such a material, for example, a copolyester of naphthalene dicarboxylic acid and terephthalic acid.

反射偏光膜係於A層與B層的界面，透過具有第1偏光方向的光(例如p波)，反射具有與第1偏光方向垂直的第2偏光方向的光(例如s波)。經反射的光，係於A層與B層的界面，一部分為具有第1偏光方向的光而進行透過，一部分為具有第2偏光方向的光而進行反射。於反射偏光膜的內部，藉由多數重複地進行如此的反 射及透過，可提高光的利用效率。 The reflective polarizing film is connected to the interface between the A layer and the B layer, and transmits light having a first polarization direction (for example, a p-wave), and reflects light having a second polarization direction perpendicular to the first polarization direction (for example, an s-wave). The reflected light is at the interface between the A layer and the B layer, and a part of the light is transmitted by the light having the first polarization direction, and a part of the light is reflected by the light having the second polarization direction. In the interior of the reflective polarizing film, such reversal is repeated by most Shooting and transmitting can improve the efficiency of light utilization.

較佳為反射偏光膜61包含反射層R作為與偏光膜52相反的最外層。藉由設置反射層R，可再利用最後未被利用而返回至反射偏光膜的最外部的光，故可進一步提高光的利用效率。反射層R代表性藉由聚酯樹脂層的多層構造而顯現反射功能。 It is preferable that the reflective polarizing film 61 includes the reflective layer R as the outermost layer opposite to the polarizing film 52. By providing the reflective layer R, the most external light that is not used and returned to the reflective polarizing film can be reused, so that the light use efficiency can be further improved. The reflective layer R is representatively exhibiting a reflection function by a multilayer structure of a polyester resin layer.

反射偏光膜的全部厚度，依照目的、於反射偏光膜所含的層之合計數等，而可適當地設定。從抑制高溫環境時的尺寸變化的觀點，反射偏光膜的全部厚度，較佳為15μm至50μm，更佳為30μm以下。 The total thickness of the reflective polarizing film can be appropriately set depending on the purpose, the total number of layers included in the reflective polarizing film, and the like. The total thickness of the reflective polarizing film is preferably from 15 μm to 50 μm, more preferably 30 μm or less from the viewpoint of suppressing dimensional change in a high-temperature environment.

作為反射偏光膜，可使用例如特表平9-507308號公報記載者。 As the reflective polarizing film, for example, those described in JP-A-9-507308 can be used.

反射偏光膜61可直接使用市售品，亦可使用市售品作為2次加工(例如延伸)。作為市售品，可舉例如3M公司製的商品名DBEF、APF。 As the reflective polarizing film 61, a commercially available product can be used as it is, or a commercially available product can be used as a secondary processing (for example, stretching). As a commercial item, the brand name DBEF and APF by 3M company are mentioned, for example.

[偏光膜與保護膜的貼合] [Adhesion of polarizing film and protective film]

偏光膜與保護膜的貼合，可藉由接著劑或黏著劑貼合。貼合偏光膜與保護膜之接著劑層，係可使其厚度設為0.01至30μm左右，較佳為0.01至10μm，更佳為0.05至5μm。接著劑層的厚度為該範圍時，於被積層的保護膜與偏光膜之間不會產生浮起、剝離，而可得到實用上無問題的接著力。貼合偏光膜與保護膜之黏著劑層係可使其厚度設為5至50μm左右，較佳為5至30μm，更佳為10至25μm。 The bonding of the polarizing film and the protective film can be carried out by an adhesive or an adhesive. The adhesive layer for bonding the polarizing film and the protective film may have a thickness of about 0.01 to 30 μm, preferably 0.01 to 10 μm, more preferably 0.05 to 5 μm. When the thickness of the coating layer is within this range, floating and peeling do not occur between the laminated protective film and the polarizing film, and an adhesive force which is practically problem-free can be obtained. The adhesive layer to which the polarizing film and the protective film are attached may have a thickness of about 5 to 50 μm, preferably 5 to 30 μm, more preferably 10 to 25 μm.

在偏光膜與保護膜的接著時，亦可預先對偏光膜、保護膜進行皂化處理、電暈處理、電漿處理等。 When the polarizing film and the protective film are next to each other, the polarizing film or the protective film may be subjected to saponification treatment, corona treatment, plasma treatment, or the like in advance.

於接著劑的形成，依據被接著體的種類、目的，可使用適合、適當的接著劑，而且依需要亦可使用錨定塗佈劑。作為接著劑，可舉例如溶劑型接著劑、乳化型接著劑、感壓性接著劑、再濕性接著劑、縮聚合型接著劑、無溶劑型接著劑、膜狀接著劑、熱熔型接著劑等。 In the formation of the adhesive, an appropriate and appropriate adhesive can be used depending on the type and purpose of the adherend, and an anchor coating agent can also be used as needed. The adhesive agent may, for example, be a solvent-based adhesive, an emulsified adhesive, a pressure-sensitive adhesive, a rewet adhesive, a polycondensation adhesive, a solventless adhesive, a film adhesive, or a hot melt type. Agents, etc.

作為較佳的接著劑之一，可舉例如水系接著劑，亦即接著劑成分溶解或分散於水者。列舉可溶解於水的接著劑成分的例時，有聚乙烯醇系樹脂。而且，列舉可分散於水的接著劑成分的例時，有具有親水基的胺酯系樹脂。水系接著劑可將如此的接著劑成分依需要所調配之追加的添加劑，同時並與水混合而調製。列舉可成為水系接著劑的市售之聚乙烯醇系樹脂的例時，有Kuraray公司販售的羧基改質聚乙烯醇之“KL-318”等。 As one of the preferable adhesives, for example, a water-based adhesive, that is, an adhesive component is dissolved or dispersed in water. When an example of an adhesive component which can be dissolved in water is mentioned, there is a polyvinyl alcohol-based resin. Further, in the case of an example of an adhesive component which can be dispersed in water, there is an amine ester-based resin having a hydrophilic group. The water-based adhesive can be prepared by mixing such an adhesive component with an additional additive as needed, and mixing with water. When an example of a commercially available polyvinyl alcohol-based resin which can be a water-based adhesive is used, there is a "KL-318" of a carboxyl-modified polyvinyl alcohol sold by Kuraray.

水系接著劑係可依需要而含有交聯劑。列舉交聯劑的例時，有胺化合物、醛化合物、羥甲基化合物、水溶性環氧樹脂、異氰酸酯化合物、多價金屬鹽等。以聚乙烯醇系樹脂作為接著劑成分時，較宜使用以乙二醛作為代表的醛化合物、羥甲基三聚氰胺為代表的羥甲基化合物、水溶性環氧樹脂等作為交聯劑。 The aqueous binder may contain a crosslinking agent as needed. Examples of the crosslinking agent include an amine compound, an aldehyde compound, a methylol compound, a water-soluble epoxy resin, an isocyanate compound, a polyvalent metal salt, and the like. When a polyvinyl alcohol-based resin is used as the adhesive component, a hydroxy compound represented by glyoxal, a methylol compound typified by methylol melamine, a water-soluble epoxy resin or the like is preferably used as the crosslinking agent.

此處，水溶性環氧樹脂係例如於如二伸乙基三胺、三伸乙基四胺的聚伸烷基聚胺與如己二酸的二羧酸之反應物之聚醯胺聚胺使環氧氯丙烷反應所得之聚醯胺環氧樹脂。 列舉水溶性環氧樹脂的市售品之例時，有田岡化學工業公司販售的“SUMIREZ RESIN(登記商標)650(30)”等。 Here, the water-soluble epoxy resin is, for example, a polyamine polyamine which is a reaction product of a polyalkylene polyamine such as di-ethyltriamine or tri-ethyltetramine and a dicarboxylic acid such as adipic acid. A polyamide resin obtained by reacting epichlorohydrin. In the case of a commercially available product of a water-soluble epoxy resin, "SUMIREZ RESIN (registered trademark) 650 (30)", which is sold by the company, is available from the company.

於偏光膜及/或貼合於此處之保護膜的接著面，塗佈水系接著劑，貼合兩者後，藉由實施乾燥處理，可得到偏光板。接著之前，於保護膜係實施如皂化處理、電暈放電處理、電漿處理或底塗處理的易接著處理，預先提高潤濕性也有效。乾燥溫度可為例如50至100℃左右。乾燥處理後，在比室溫略高的溫度，例如30至50℃左右的溫度熟成1至10天左右，在進一步提高接著力上較佳。 A water-based adhesive is applied to the surface of the polarizing film and/or the protective film bonded thereto, and after bonding the two, a polarizing plate can be obtained by performing a drying treatment. Next, the protective film is subjected to an easy-to-treat treatment such as a saponification treatment, a corona discharge treatment, a plasma treatment, or a primer treatment, and it is also effective to improve the wettability in advance. The drying temperature may be, for example, about 50 to 100 °C. After the drying treatment, it is preferably aged at a temperature slightly higher than room temperature, for example, at a temperature of about 30 to 50 ° C for about 1 to 10 days, and it is preferable to further increase the adhesion.

作為另一較佳的接著劑，可舉例如含有藉由活性能量線的照射或加熱而硬化的環氧化合物之硬化性接著劑組成物。此處，硬化性之環氧化合物係分子內至少具有2個環氧基者。此時，偏光膜與保護膜的接著係藉由對該接著劑組成物的塗佈層，照射活性能量線或賦予熱，使在接著劑含有的硬化性環氧化合物硬化的方法來進行。環氧化合物的硬化，一般藉由環氧化合物的陽離子聚合來進行。而且，從生產性的觀點，該硬化係藉由活性能量線的照射來進行較佳。 Another preferable adhesive agent is, for example, a curable adhesive composition containing an epoxy compound which is cured by irradiation or heating of an active energy ray. Here, the curable epoxy compound has at least two epoxy groups in the molecule. At this time, the adhesion between the polarizing film and the protective film is performed by irradiating the coating layer of the adhesive composition with an active energy ray or applying heat to cure the curable epoxy compound contained in the adhesive. The hardening of the epoxy compound is generally carried out by cationic polymerization of an epoxy compound. Further, from the viewpoint of productivity, the hardening is preferably carried out by irradiation with an active energy ray.

從耐候性、折射率、陽離子聚合性等的觀點，以在硬化性接著劑組成物所含有的環氧化合物，在分子內不含芳香環者為較佳。作為在分子內不含有芳香環的環氧化合物，可例示氫化環氧化合物、脂環式環氧化合物、脂肪族環氧化合物等。可適合使用於如此的硬化性接著劑組成物之環氧化合物，例如在特開2004-245925號公報已 詳細說明，但此處概略說明。 From the viewpoints of weather resistance, refractive index, cationic polymerizability, and the like, it is preferred that the epoxy compound contained in the curable adhesive composition does not contain an aromatic ring in the molecule. Examples of the epoxy compound which does not contain an aromatic ring in the molecule include a hydrogenated epoxy compound, an alicyclic epoxy compound, and an aliphatic epoxy compound. An epoxy compound which can be suitably used for such a hardenable adhesive composition, for example, in Japanese Laid-Open Patent Publication No. 2004-245925 Detailed description, but here is a brief description.

氫化環氧化合物係可為藉由使在芳香族環氧化合物的原料之芳香族聚羥基化合物在觸媒存在下及加壓下選擇性地進行核氫化反應所得之核氫化聚羥基化合物，進行環氧丙基醚化者。作為芳香族環氧化合物的原料之芳香族聚羥基化合物，係例如雙酚A、雙酚F及雙酚S的雙酚類；酚酚醛樹脂、甲酚酚醛樹脂及羥基苯甲醛酚酚醛樹脂的酚醛樹脂型之樹脂；四羥基二苯基甲烷、四羥基二苯甲酮及聚乙烯基酚的多官能基型之化合物等。於如此的芳香族聚羥基化合物進行核氫化反應，所得之核氫化聚羥基化合物與環氧氯丙烷反應，可進行環氧丙基醚化。作為適合的氫化環氧化合物，可舉例如經氫化的雙酚A的環氧丙基醚。 The hydrogenated epoxy compound may be a cyclic hydrogenated polyhydroxy compound obtained by selectively performing a nuclear hydrogenation reaction in the presence of a catalyst and an aromatic polyhydroxy compound in a raw material of an aromatic epoxy compound. Oxypropyl propyl etherification. The aromatic polyhydroxy compound which is a raw material of the aromatic epoxy compound is, for example, bisphenols of bisphenol A, bisphenol F and bisphenol S; phenolic phenolic resin, cresol novolac resin and phenolic phenolic phenolic resin Resin type resin; a compound of a polyfunctional type of tetrahydroxydiphenylmethane, tetrahydroxybenzophenone, and polyvinylphenol. The above-mentioned aromatic polyhydroxy compound is subjected to a nuclear hydrogenation reaction, and the obtained nuclear hydrogenated polyhydroxy compound is reacted with epichlorohydrin to carry out epoxypropyl etherification. As a suitable hydrogenated epoxy compound, the hydrogenated bisphenol A glycopropyl ether is mentioned, for example.

脂環式環氧化合物係於分子內具有至少1個鍵結於脂環式環的環氧基之化合物。所謂「鍵結於脂環式環的環氧基」，係指以下式所示的構造之橋接的氧原子-O-，該式中，m為2至5的整數。 The alicyclic epoxy compound is a compound having at least one epoxy group bonded to an alicyclic ring in the molecule. The "epoxy group bonded to the alicyclic ring" means a bridged oxygen atom -O- in the structure represented by the following formula, wherein m is an integer of 2 to 5.

除去1個或複數個此式之(CH2)m中的氫原子的形式的基鍵結於其他化學構造的化合物，可成為脂環式環氧化合物。而且，形成脂環式環的(CH2)m中之1個或複數個氫原子，亦可被如甲基、乙基的直鏈狀烷基適當地取 代。脂環式環氧化合物之中，從顯示良好的接著性，較宜使用具有氧雜雙環己環(於上式中m=3者)、氧雜雙環庚環(於上式m=4者)的環氧化合物。以下，揭露脂環式環氧化合物的具體例。此處，首先，例舉化合物名稱，然後，顯示分別對應的化學式，化合物名稱與對應其之化學式，係賦予相同的符號。 A group in which one or a plurality of hydrogen atoms in the formula (CH 2 ) m are removed and bonded to another chemical structure may be an alicyclic epoxy compound. Further, one or a plurality of hydrogen atoms of (CH 2 ) m forming an alicyclic ring may be appropriately substituted with a linear alkyl group such as a methyl group or an ethyl group. Among the alicyclic epoxy compounds, from the viewpoint of exhibiting good adhesion, it is preferred to use an oxabicyclohexyl ring (in the above formula, m=3) or an oxabicycloheptane (in the above formula m=4). Epoxy compound. Specific examples of the alicyclic epoxy compound are disclosed below. Here, first, the compound names are exemplified, and then the corresponding chemical formulas are shown, and the compound names and the chemical formulas corresponding thereto are given the same symbols.

A：3,4-環氧基環己羧酸3,4-環氧基環己基甲酯、B：3,4-環氧基-6-甲基環己羧酸3,4-環氧基-6-甲基環己基甲酯、C：伸乙基雙(3,4-環氧基環己羧酸酯)、D：己二酸雙(3,4-環氧基環己基甲基)酯、E：己二酸雙(3,4-環氧基-6-甲基環己基甲基)酯、F：二乙二醇雙(3,4-環氧基環己基甲基醚)、G：乙二醇雙(3,4-環氧基環己基甲基醚)、H：2,3,14,15-二環氧基-7,11,18,21-四氧雜三螺環[5.2.2.5.2.2]二十一烷、I：3-(3,4-環氧基環己基)-8,9-環氧基-1,5-二氧雜螺環[5.5]十一烷、J：4-乙烯基環己烯二氧化物、K：檸檬烯二氧化物L：雙(2,3-環氧基環戊基)醚、M：二環戊二烯二氧化物等。 A: 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylic acid, B: 3,4-epoxy group of 3,4-epoxy-6-methylcyclohexanecarboxylic acid -6-methylcyclohexylmethyl ester, C: exoethyl bis(3,4-epoxycyclohexanecarboxylate), D: bis(3,4-epoxycyclohexylmethyl) adipate Ester, E: bis(3,4-epoxy-6-methylcyclohexylmethyl) adipate, F: diethylene glycol bis(3,4-epoxycyclohexylmethyl ether), G: ethylene glycol bis(3,4-epoxycyclohexylmethyl ether), H: 2,3,14,15-diepoxy-7,11,18,21-tetraoxa trispiro [5.2.2.5.2.2] Behenane, I: 3-(3,4-epoxycyclohexyl)-8,9-epoxy-1,5-dioxaspiro[5.5] Alkane, J: 4-vinylcyclohexene dioxide, K: limonene dioxide L: bis(2,3-epoxycyclopentyl) ether, M: dicyclopentadiene dioxide, and the like.

脂肪族環氧化合物係可為脂肪族多元醇或其環氧烷加成物的聚環氧丙基醚。更具體地，丙二醇的二環氧丙基醚；1,4-丁二醇的二環氧丙基醚；1,6-己二醇的二 環氧丙基醚；丙三醇的三環氧丙基醚；三羥甲基丙烷的三環氧丙基醚；藉由於如乙二醇、丙二醇及丙三醇的脂肪族多元醇加成環氧烷(環氧乙烷、環氧丙烷)所得之聚醚多元醇的聚環氧丙基醚(例如聚乙二醇的二環氧丙基醚)等。 The aliphatic epoxy compound may be a polyepoxypropyl ether of an aliphatic polyol or an alkylene oxide adduct thereof. More specifically, diepoxypropyl ether of propylene glycol; diepoxypropyl ether of 1,4-butanediol; two of 1,6-hexanediol Epoxypropyl ether; triepoxypropyl ether of glycerol; triepoxypropyl ether of trimethylolpropane; by aliphatic polyol addition ring such as ethylene glycol, propylene glycol and glycerol A polyepoxypropyl ether of a polyether polyol obtained from oxyalkylene (ethylene oxide or propylene oxide) (for example, a di-epoxypropyl ether of polyethylene glycol).

於硬化性接著劑組成物中，環氧化合物可單獨使用1種，亦可併用2種以上。其中，該環氧化合物係包含於分子內具有至少1個鍵結於脂環式環的環氧基之脂環式環氧化合物較佳。 In the composition of the curable adhesive, the epoxy compound may be used singly or in combination of two or more. Among them, the epoxy compound is preferably an alicyclic epoxy compound having at least one epoxy group bonded to an alicyclic ring in the molecule.

硬化性接著劑組成物所使用的環氧化合物，通常具有30至3,000g/當量的範圍內之環氧當量，該環氧當量較佳為50至1,500g/當量的範圍。使用環氧當量低於30g/當量的環氧化合物時，有硬化後的偏光板的可撓性降低，接著強度降低的可能性。另一方面，於具有超過3,000g/當量的環氧當量之化合物，有與接著劑組成物所含的其他成分之相溶性降低的可能性。 The epoxy compound used in the curable adhesive composition usually has an epoxy equivalent in the range of 30 to 3,000 g/eq, and the epoxy equivalent is preferably in the range of 50 to 1,500 g/eq. When an epoxy compound having an epoxy equivalent of less than 30 g/eq is used, the flexibility of the polarizing plate after curing is lowered, and the strength may be lowered. On the other hand, in the compound having an epoxy equivalent of more than 3,000 g/eq, there is a possibility that the compatibility with other components contained in the adhesive composition is lowered.

從反應性的觀點，作為環氧化合物的硬化反應，使用陽離子聚合較佳。因此，在含有環氧化合物的硬化性接著劑組成物，以調配陽離子聚合引發劑為較佳。陽離子聚合引發劑係藉由如可見光線、紫外線、X射線及電子線的活性能量線的照射或加熱，產生陽離子物質或路易斯酸，引發環氧基的聚合反應。從操作性的觀點，對陽離子聚合引發劑賦予潛伏性為較佳。以下，藉由活性能量線的照射而產生陽離子物質或路易斯酸，引發環氧基的聚合反應之陽離子聚合引發劑稱為「光陽離子聚合引發劑」， 藉由熱而產生陽離子物質或路易斯酸，引發環氧基的聚合反應之陽離子聚合引發劑稱為「熱陽離子聚合引發劑」。 From the viewpoint of reactivity, cationic polymerization is preferred as the curing reaction of the epoxy compound. Therefore, it is preferred to formulate a cationic polymerization initiator in the curable adhesive composition containing an epoxy compound. The cationic polymerization initiator generates a cationic substance or a Lewis acid by irradiation or heating of an active energy ray such as visible light, ultraviolet rays, X-rays, and electron rays to initiate polymerization of an epoxy group. From the viewpoint of workability, it is preferred to impart a latent property to the cationic polymerization initiator. Hereinafter, a cationic polymerization initiator which generates a cationic substance or a Lewis acid by irradiation of an active energy ray and initiates polymerization of an epoxy group is referred to as a "photocationic polymerization initiator". A cationic polymerization initiator which initiates polymerization of an epoxy group by generating a cationic substance or a Lewis acid by heat is called a "thermal cationic polymerization initiator".

使用光陽離子聚合引發劑，藉由活性能量線的照射，進行接著劑組成物硬化的方法，可在常溫常濕下硬化，考量偏光膜的耐熱性或因膨脹所致的扭曲之必要性減少，在可良好地接著保護膜與偏光膜的點為有利。而且，光陽離子聚合引發劑因光的觸媒作用，即使混合在環氧化合物，保存安定性、操作性亦佳。 The photocationic polymerization initiator is used to cure the adhesive composition by irradiation with an active energy ray, and it can be cured under normal temperature and normal humidity, and the heat resistance of the polarizing film or the necessity of distortion due to expansion is reduced. It is advantageous at a point where the protective film and the polarizing film can be well adhered. Further, the photocationic polymerization initiator is excellent in storage stability and workability even when it is mixed with an epoxy compound due to a photocatalytic action of light.

作為光陽離子聚合引發劑，可舉例如芳香族重氮鹽；如芳香族錪鹽、芳香族硫鎓鹽的鎓鹽、鐵-芳烴錯合物等。光陽離子聚合引發劑的調配量，相對於環氧化合物100重量份，通常為0.5至20重量份，較佳為1重量份以上，又較佳為15重量份以下。 The photocationic polymerization initiator may, for example, be an aromatic diazonium salt; for example, an aromatic onium salt, an onium salt of an aromatic sulfonium salt, an iron-aromatic hydrocarbon complex or the like. The compounding amount of the photocationic polymerization initiator is usually 0.5 to 20 parts by weight, preferably 1 part by weight or more, and preferably 15 parts by weight or less based on 100 parts by weight of the epoxy compound.

光陽離子聚合引發劑的調配量，相對於環氧化合物100重量份，低於0.5重量份時，硬化變得不充分，硬化物的機械強度、接著強度有降低的傾向。 When the amount of the photo-cationic polymerization initiator is less than 0.5 part by weight based on 100 parts by weight of the epoxy compound, the curing is insufficient, and the mechanical strength and the subsequent strength of the cured product tend to be lowered.

另一方面，光陽離子聚合引發劑的調配量，相對於環氧化合物100重量份，超過20重量份時，因硬化物中的離子性物質增加，硬化物的吸濕性變高，耐久性能有降低的可能性。 On the other hand, when the amount of the photocationic polymerization initiator is more than 20 parts by weight based on 100 parts by weight of the epoxy compound, the ionic substance in the cured product increases, and the hygroscopic property of the cured product becomes high, and durability can be improved. The possibility of reduction.

使用光陽離子聚合引發劑時，硬化性接著劑組成物依據需要可再含有光增感劑。藉由使用光增感劑，可提高陽離子聚合的反應性，提高硬化物的機械強度、接著強度。作為光增感劑，例如羰基化合物、有機硫化合 物、過硫化物、氧化還原系化合物、偶氮化合物、重氮化合物、鹵化物、光還原性色素等。調配光增感劑時，其量相對於硬化性接著劑組成物100重量份，為0.1至20重量份的範圍內較佳，而且，為了提高硬化速度，亦可使用如萘醌衍生物的增感助劑。 When a photocationic polymerization initiator is used, the curable adhesive composition may further contain a photosensitizer as needed. By using a photosensitizer, the reactivity of cationic polymerization can be improved, and the mechanical strength and the subsequent strength of the cured product can be improved. As a photosensitizer, such as carbonyl compounds, organic sulfuration A substance, a persulfide compound, a redox compound, an azo compound, a diazo compound, a halide, a photoreductive dye, or the like. When the photo-sensitizer is blended, the amount thereof is preferably in the range of 0.1 to 20 parts by weight based on 100 parts by weight of the curable adhesive composition, and in order to increase the curing rate, for example, an increase in naphthoquinone derivatives may be used. Sensitive additives.

另一方面，作為熱陽離子聚合引發劑，係可舉例如苯甲基硫鎓鹽、硫苯鎓鹽、四氫噻吩鎓鹽、苯甲基銨、吡啶鎓鹽、肼鎓鹽(hydrazinium)、羧酸酯、磺酸酯、胺醯亞胺等。 On the other hand, examples of the thermal cationic polymerization initiator include benzylsulfonium salt, thiophenylsulfonium salt, tetrahydrothiophene phosphonium salt, benzylammonium salt, pyridinium salt, hydrazinium, and carboxylate. Acid esters, sulfonates, amine imines, and the like.

含有環氧化合物的硬化性接著劑組成物，如前述，藉由光陽離子聚合而使其硬化較佳，但使上述熱陽離子聚合引發劑存在，也可藉由熱陽離子聚合而硬化，亦可併用光陽離子聚合及熱陽離子聚合。併用光陽離子聚合及熱陽離子聚合之時，於硬化性接著劑組成物係以含有光陽離子聚合引發劑及熱陽離子聚合引發劑兩者為較佳。 The curable adhesive composition containing an epoxy compound is preferably cured by photocationic polymerization as described above, but the thermal cationic polymerization initiator may be present, or may be cured by thermal cationic polymerization, or may be used in combination. Photocationic polymerization and thermal cationic polymerization. In the case of photocationic polymerization and thermal cationic polymerization, it is preferred that both the photocationic polymerization initiator and the thermal cationic polymerization initiator are contained in the curable adhesive composition.

而且，硬化性接著劑組成物亦可更含有氧雜環丁烷(oxetane)化合物、多元醇化合物等促進陽離子聚合的化合物。氧雜環丁烷化合物係分子內具有4員環醚的化合物。調配氧雜環丁烷化合物時，其量在硬化性接著劑組成物中通常為5至95重量%，較佳為5至50重量%。而且，多元醇化合物可為包含乙二醇、己二醇、聚乙二醇等的烷二醇或其寡聚物、聚酯多元醇、聚己內酯多元醇、聚碳酸酯多元醇等。於調配多元醇化合物時，其量在硬化性接著劑組成物中通常為50重量%以下，較佳為30重量%以 下。 Further, the curable adhesive composition may further contain a compound which promotes cationic polymerization such as an oxetane compound or a polyol compound. The oxetane compound is a compound having a 4-membered cyclic ether in its molecule. When the oxetane compound is blended, the amount thereof is usually from 5 to 95% by weight, preferably from 5 to 50% by weight, based on the composition of the curable adhesive. Further, the polyol compound may be an alkylene glycol or an oligomer thereof comprising ethylene glycol, hexanediol, polyethylene glycol or the like, a polyester polyol, a polycaprolactone polyol, a polycarbonate polyol or the like. When the polyol compound is formulated, the amount thereof is usually 50% by weight or less, preferably 30% by weight or less, based on the composition of the curable adhesive. under.

再者，硬化性接著劑組成物係只要無損其接著性，可含有其他添加劑，例如離子捕捉劑、抗氧化劑、鏈轉移劑、增感劑、增黏劑、熱塑性樹脂、填充劑、流動調整劑、可塑劑、消泡劑等。作為離子捕捉劑，可舉例如粉末狀的鉍系、銻系、鎂系、鋁系、鈣系、鈦系、包含該等的混合系等之無機化合物，作為抗氧化劑可舉例如受阻酚系抗氧化劑等。 Further, the curable adhesive composition may contain other additives such as an ion trapping agent, an antioxidant, a chain transfer agent, a sensitizer, a tackifier, a thermoplastic resin, a filler, and a flow regulator as long as the adhesion is not impaired. , plasticizers, defoamers, etc. The ion scavenger may, for example, be a powdery lanthanum, lanthanide, magnesium, aluminum, calcium, or titanium, or an inorganic compound containing such a mixed system, and examples of the antioxidant include hindered phenolic resistance. Oxidizing agents, etc.

將含有環氧化合物的硬化性接著劑組成物塗佈於偏光膜或保護膜的接著面、或該等兩者的接著面之後，以塗佈有接著劑的面貼合，藉由照射活性能量線或加熱，使未硬化的接著劑層硬化，可接著偏光膜與保護膜。作為接著劑的塗佈方法，可採用例如刮刀、線棒、狹縫塗佈機、缺角輪塗佈機、凹版塗佈機等各種塗佈的方式。 Applying the curable adhesive composition containing an epoxy compound to the adhesion surface of the polarizing film or the protective film or the adhesion surface of the both, and bonding the surface coated with the adhesive to irradiate the active energy Wire or heat to harden the uncured adhesive layer, followed by a polarizing film and a protective film. As a coating method of an adhesive agent, various coating methods, such as a doctor blade, a wire bar, a slit coater, a notch coater, and a gravure coater can be employ|adopted.

該硬化性接著劑組成物基本上作為實質上不含溶劑的無溶劑型接著劑係可使用，但於各塗佈方式因具有各種合適的黏度範圍，故為了調整黏度，亦可含有溶劑。溶劑較佳係不使偏光膜的光學性能降低，可良好地溶解以環氧化合物為首的各成分之有機溶劑，可使用例如甲苯為代表的烴類、乙酸乙酯為代表的酯類等。 The curable adhesive composition can be basically used as a solventless adhesive which does not substantially contain a solvent. However, since each coating method has various suitable viscosity ranges, a solvent may be contained in order to adjust the viscosity. The solvent is preferably such that the optical properties of the polarizing film are not lowered, and the organic solvent of each component including an epoxy compound can be satisfactorily dissolved. For example, a hydrocarbon represented by toluene or an ester represented by ethyl acetate can be used.

藉由照射活性能量線進行接著劑組成物的硬化時，作為活性能量線，可使用前述的各種者，但因容易處理，亦容易控制照射的光量等，故使用紫外線較佳。活性能量線，例如紫外線的照射強度、照射量，在不影響 以偏光膜的偏光度為首的各種光學性能、及保護膜的透明性、相位差特性為首的各種光學性能的範圍下，可以保持適度的生產性之方式適當地決定。 When the adhesive composition is cured by irradiation with an active energy ray, various types of the above-described various types can be used as the active energy ray. However, since it is easy to handle, it is also easy to control the amount of light to be irradiated, and the like, and it is preferable to use ultraviolet rays. Active energy rays, such as ultraviolet radiation intensity, exposure, do not affect In the range of various optical properties including the transparency of the polarizing film and the transparency and phase difference characteristics of the protective film, the optical productivity can be appropriately determined in such a manner that appropriate productivity can be maintained.

藉由熱進行接著劑組成物的硬化時，可以一般習知的方法加熱。通常係調配於硬化性接著劑組成物的熱陽離子聚合引發劑以產生陽離子物質、路易斯酸的溫度以上進行加熱，具體之加熱溫度，例如為50至200℃左右。 When the adhesive composition is hardened by heat, it can be heated by a generally known method. Usually, the thermal cationic polymerization initiator which is blended in the curable adhesive composition is heated at a temperature higher than the temperature at which the cationic substance and the Lewis acid are generated. Specifically, the heating temperature is, for example, about 50 to 200 °C.

[黏著劑] [adhesive]

作為黏著劑，只要為光學透明性優，包含適度的潤濕性、聚集性、接著性等之黏著特性優異者即可，但進一步以耐久性優異者為較佳。具體地，作為形成黏著劑層的黏著劑，以含有丙烯酸系樹脂的黏著劑(丙烯酸系黏著劑)為較佳。 The adhesive is excellent in optical transparency, and is excellent in adhesion properties such as moderate wettability, aggregation, and adhesion. However, it is preferable to further improve durability. Specifically, as the adhesive for forming the adhesive layer, an adhesive (acrylic adhesive) containing an acrylic resin is preferable.

丙烯酸系黏著劑所含有的丙烯酸系樹脂，係以如丙烯酸丁酯、丙烯酸乙酯、丙烯酸異辛酯及丙烯酸2-乙基己酯的丙烯酸烷酯作為主要單體的樹脂。該丙烯酸系樹脂通常係使極性單體共聚合，所謂極性單體，係指具有聚合性不飽和鍵結及極性官能基的化合物，此處，聚合性不飽和鍵結一般係形成為來自(甲基)丙烯醯基者，而且，極性官能基可為羧基、羥基、醯胺基、胺基、環氧基等。列舉極性單體的具體例時，有(甲基)丙烯酸、(甲基)丙烯酸2-羥基丙酯、(甲基)丙烯酸2-烴基乙酯、(甲基)丙烯醯胺、(甲基)丙烯酸2-N,N-二甲基胺基乙酯、(甲基)丙烯 酸環氧丙酯等。 The acrylic resin contained in the acrylic adhesive is a resin containing, as a main monomer, an alkyl acrylate such as butyl acrylate, ethyl acrylate, isooctyl acrylate or 2-ethylhexyl acrylate. The acrylic resin is usually a copolymer of a polar monomer, and a polar monomer refers to a compound having a polymerizable unsaturated bond and a polar functional group. Here, a polymerizable unsaturated bond is generally formed from (A). Further, the polar functional group may be a carboxyl group, a hydroxyl group, a decylamino group, an amine group, an epoxy group or the like. Specific examples of the polar monomer include (meth)acrylic acid, 2-hydroxypropyl (meth)acrylate, 2-hydrocarbylethyl (meth)acrylate, (meth)acrylamide, (methyl) 2-N,N-dimethylaminoethyl acrylate, (meth) propylene Acid glycidyl ester and the like.

而且，於丙烯酸系黏著劑通常與丙烯酸系樹脂一起調配交聯劑。 Further, a crosslinking agent is usually blended with an acrylic resin in an acrylic adhesive.

作為交聯劑的代表例，可舉例如在分子內具有至少2個異氰酸酯基(-NCO)的異氰酸酯化合物。 A typical example of the crosslinking agent is, for example, an isocyanate compound having at least two isocyanate groups (-NCO) in the molecule.

於黏著劑可再調配各種添加劑。作為適合的添加劑，可舉例如矽烷偶合劑、帶電防止劑等。矽烷偶合劑在提高與玻璃的接著力上為有效。帶電防止劑在減少或防止靜電的產生上為有效。 Various additives can be formulated for the adhesive. As a suitable additive, a decane coupling agent, a charging prevention agent, etc. are mentioned, for example. The decane coupling agent is effective in increasing the adhesion to the glass. The charge preventing agent is effective in reducing or preventing the generation of static electricity.

黏著劑層係可藉由調製如以上的黏著劑成分溶解於有機溶劑所成的黏著劑組成物，將其直接塗佈於偏光膜上或保護膜上，乾燥除去溶劑的方法，或者，藉由將上述黏著劑組成物塗佈於由經施予離型處理的樹脂膜所構成的基材膜的離型處理面，乾燥除去溶劑而作為黏著劑層，將此貼附於透明保護膜上，轉印黏著劑層的方法來形成。藉由前者的直接塗佈法而於透明保護膜上形成黏著劑層時，係於其表面貼合經施予離型處理的樹脂膜(亦稱為分離膜)，直至使用時，暫時保護黏著劑層表面者為通例。從有機溶劑溶液之黏著劑組成物的處理性的觀點等，大多採用後者的轉印法，此時，最初使用於黏著劑層的形成之經離型處理的基材膜，從貼附於偏光板後可直接成為分離膜之點，亦為較適合。 The adhesive layer can be directly applied to a polarizing film or a protective film by preparing an adhesive composition in which an adhesive component as described above is dissolved in an organic solvent, drying or removing the solvent, or by Applying the above-mentioned adhesive composition to a release-treated surface of a base film formed of a resin film subjected to a release treatment, drying and removing the solvent to form an adhesive layer, and attaching the adhesive film to the transparent protective film. A method of transferring an adhesive layer is formed. When the adhesive layer is formed on the transparent protective film by the direct coating method of the former, the resin film (also referred to as a separation film) subjected to the release treatment is attached to the surface thereof, and the adhesive is temporarily protected until use. The surface of the agent layer is a general case. The latter transfer method is often used from the viewpoint of handleability of the adhesive composition of the organic solvent solution, etc., and in this case, the base film which is first used for the release treatment of the adhesive layer is attached to the polarized light. It can also be directly used as a separation membrane after the plate, which is also suitable.

於偏光膜、或保護膜積層黏著劑之前，偏光膜面、保護膜面、黏著劑面，預先進行電暈處理、電漿 處理等均可使用。 Before the polarizing film or the protective film build-up adhesive, the polarizing film surface, the protective film surface, and the adhesive surface are pre-corona treated and plasma-treated. Processing can be used.

[黏著劑層33、53、接著層54] [Adhesive layer 33, 53, and subsequent layer 54]

於偏光板與液晶胞的貼合，係可使用黏著劑層，於吸收型偏光板50與增亮膜61的貼合，係可使用接著劑或黏著劑，任一貼合皆使用黏著劑為較佳。黏著劑層係只要為光學透明性優異、包括適度的潤濕性、聚集性、接著性等之黏著特性優異者即可，再者耐久性等優異者為較佳。具體地，作為形成黏著劑層的黏著劑，含有丙烯酸系樹脂的黏著劑(丙烯酸系黏著劑)為較佳。 In the bonding between the polarizing plate and the liquid crystal cell, an adhesive layer can be used, and the adhesive polarizing plate 50 and the brightness enhancing film 61 can be bonded together, and an adhesive or an adhesive can be used, and any adhesive is used as an adhesive. Preferably. The adhesive layer layer is excellent in optical transparency, and includes excellent adhesion properties such as moderate wettability, aggregation, and adhesion, and is excellent in durability and the like. Specifically, as the adhesive forming the pressure-sensitive adhesive layer, an adhesive (acrylic adhesive) containing an acrylic resin is preferable.

作為黏著劑層，可使用與上述偏光膜與保護膜的貼合所使用者為相同者。黏著劑係分別可使用相異者，亦可使用相同者。 As the adhesive layer, the same as those used for bonding the polarizing film and the protective film described above can be used. Adhesives can be used separately or in the same way.

於偏光板積層黏著劑之前，於偏光膜面、保護膜面及黏著劑面預先進行電暈處理或電漿處理等也可使用。而且，積層增亮膜時，於增亮膜61的貼合面及黏著劑面，預先進行電暈處理或電漿處理等也可使用。從增亮膜61靠近液晶胞的觀點，使用於增亮膜的積層之黏著劑層以25μm以下為較佳。更佳為15μm以下。通常黏著劑層的厚度為3μm以上。 Before the polarizing plate is laminated with an adhesive, corona treatment or plasma treatment may be applied to the polarizing film surface, the protective film surface, and the adhesive surface in advance. Further, when the brightness-increasing film is laminated, the bonding surface and the adhesive surface of the brightness enhancement film 61 may be used in advance for corona treatment or plasma treatment. From the viewpoint that the brightness enhancement film 61 is close to the liquid crystal cell, the adhesive layer used for the laminate of the brightness enhancement film is preferably 25 μm or less. More preferably, it is 15 μm or less. Usually, the thickness of the adhesive layer is 3 μm or more.

以上所說明的本發明的偏光板之套組，於觀看側偏光板30，偏光膜32的吸收軸與液晶胞的長邊方向約略平行，於背面側偏光板60係偏光膜52的吸收軸與液晶胞的短邊方向約略平行為較佳。 In the set of polarizing plates of the present invention described above, in the viewing-side polarizing plate 30, the absorption axis of the polarizing film 32 is approximately parallel to the longitudinal direction of the liquid crystal cell, and the absorption axis of the polarizing film 52 on the back side polarizing plate 60 is It is preferred that the short side directions of the liquid crystal cells are approximately parallel.

[液晶胞] [liquid crystal cell]

液晶胞係具有2片胞基板及夾於該等基板間的液晶層。胞基板一般多由玻璃所構成，但可為塑膠基板。其他，使用於本發明的液晶面板之液晶胞本身，可以在該領域所採用的各種液晶胞(例如IPS模式、VA模式、TN模式等作為驅動模式之習知者)所構成。 The liquid crystal cell system has two cell substrates and a liquid crystal layer interposed between the substrates. The cell substrate is generally composed of glass, but may be a plastic substrate. Others, the liquid crystal cell itself used in the liquid crystal panel of the present invention can be constituted by various liquid crystal cells (for example, IPS mode, VA mode, TN mode, or the like as a driving mode) employed in the field.

[液晶面板] [LCD panel]

藉由隔著黏著劑層而將偏光板貼合於液晶胞，可製作液晶面板。 A liquid crystal panel can be produced by bonding a polarizing plate to a liquid crystal cell via an adhesive layer.

本發明的液晶面板，係使用從液晶胞至增亮膜的距離為100μm以下，觀看側偏光板於85℃加熱100小時之時的吸收軸方向之尺寸變化率、與於背面側偏光板所含的吸收型偏光板於85℃加熱100小時之時的吸收軸方向之尺寸變化率的比為0.62以上1.25以下的偏光板之套組。 In the liquid crystal panel of the present invention, the distance from the liquid crystal cell to the brightness enhancement film is 100 μm or less, and the dimensional change rate in the absorption axis direction when the viewing side polarizing plate is heated at 85 ° C for 100 hours is included in the absorption axis direction of the back side polarizing plate. When the absorption type polarizing plate is heated at 85 ° C for 100 hours, the ratio of the dimensional change ratio in the absorption axis direction is 0.62 or more and 1.25 or less.

從其他的觀點，本發明的液晶面板，於85℃加熱240小時之時的翹曲量的絕對值為0.5mm以下，較佳為0.3mm以下。藉由將如此的偏光板之套組貼合於液晶胞，本發明的液晶面板成為在高溫環境下的翹曲被抑制、且可收納於最終製品的機殼之液晶顯示面板。 From the other viewpoints, the absolute value of the amount of warpage of the liquid crystal panel of the present invention when heated at 85 ° C for 240 hours is 0.5 mm or less, preferably 0.3 mm or less. By laminating such a set of polarizing plates to a liquid crystal cell, the liquid crystal panel of the present invention is a liquid crystal display panel in which warpage in a high-temperature environment is suppressed and can be accommodated in a casing of a final product.

本發明的液晶面板，特別可適合使用於暴露在屋外等高溫多的中小型用液晶顯示裝置。例如，適合於液晶面板的大小為對角15吋以下的情形。 The liquid crystal panel of the present invention is particularly suitably used for a small-to-medium-sized liquid crystal display device which is exposed to a high temperature such as a house. For example, it is suitable for the case where the size of the liquid crystal panel is 15 angstroms or less.

而且，可更縮小在高溫環境下之液晶面板的翹曲之點，從液晶胞至增亮膜的距離為90μm以下為較 佳，以80μm以下更佳，亦可為60μm以下。而且，將觀看側偏光板於85℃加熱100小時之時的吸收軸方向之尺寸變化率、與背面側偏光板所含的吸收型偏光板於85℃加熱100小時之時的吸收軸方向之尺寸變化率的比為0.65以上1.2以下較佳，以0.7以上1.15以下為更佳。 Moreover, the warpage of the liquid crystal panel in a high temperature environment can be further reduced, and the distance from the liquid crystal cell to the brightness enhancement film is 90 μm or less. Preferably, it is preferably 80 μm or less, and may be 60 μm or less. In addition, the dimensional change rate in the absorption axis direction when the viewing-side polarizing plate was heated at 85 ° C for 100 hours and the absorption axis direction when the absorption-type polarizing plate contained in the back-side polarizing plate was heated at 85 ° C for 100 hours The ratio of the rate of change is preferably 0.65 or more and 1.2 or less, more preferably 0.7 or more and 1.15 or less.

將觀看側偏光板於85℃加熱100小時之時的吸收軸方向之尺寸變化率為0.8%以上較佳，更佳為1.0%以上。背面側偏光板所含的吸收型偏光板於85℃加熱100小時之時的吸收軸方向之尺寸變化率為1.4%以下較佳，更佳為1.3%以下。再者，偏光板的吸收軸方向之尺寸變化率係例如可藉由調整將保護膜貼合於偏光膜後的乾燥步驟之長度或溫度、偏光膜的厚度及偏光膜的延伸倍率等而控制。 The dimensional change ratio in the absorption axis direction when the viewing-side polarizing plate is heated at 85 ° C for 100 hours is preferably 0.8% or more, more preferably 1.0% or more. The dimensional change rate in the absorption axis direction when the absorption-type polarizing plate contained in the back side polarizing plate is heated at 85 ° C for 100 hours is preferably 1.4% or less, more preferably 1.3% or less. In addition, the dimensional change rate of the polarizing plate in the absorption axis direction can be controlled, for example, by adjusting the length or temperature of the drying step after bonding the protective film to the polarizing film, the thickness of the polarizing film, and the stretching ratio of the polarizing film.

而且，在製作偏光板後，藉由在40℃至80℃的範圍下進行加熱處理，調整偏光板的吸收軸方向之尺寸變化率的方法也可使用。從避免因偏光板的急速收縮所致之外觀不良的觀點，在40℃至60℃的範圍下進行加熱處理更佳。 Further, after the polarizing plate is produced, a method of adjusting the dimensional change rate in the absorption axis direction of the polarizing plate by heat treatment in a range of 40 ° C to 80 ° C can be used. From the viewpoint of avoiding appearance defects due to rapid shrinkage of the polarizing plate, it is more preferable to carry out heat treatment in the range of 40 ° C to 60 ° C.

將偏光板於85℃加熱100小時之時的吸收軸方向之尺寸變化率，如下述進行測定。首先，將偏光板裁切為長度方向100mm×寬度方向100mm的大小，於溫度23℃、濕度55%的環境下靜置1天，測定MD方向(吸收軸方向)的尺寸(L0)。然後，於85℃的環境下靜置100小時，測定靜置於高溫環境後的MD方向之尺寸(L1)。其結果一起由式(c)求出尺寸變化率(%)。 The dimensional change rate in the absorption axis direction when the polarizing plate was heated at 85 ° C for 100 hours was measured as follows. First, the polarizing plate was cut into a size of 100 mm in the longitudinal direction and 100 mm in the width direction, and allowed to stand in an environment of a temperature of 23 ° C and a humidity of 55% for one day, and the size (L0) in the MD direction (absorption axis direction) was measured. Then, it was allowed to stand in an environment of 85 ° C for 100 hours, and the size (L1) in the MD direction after standing in a high temperature environment was measured. As a result, the dimensional change rate (%) was obtained from the formula (c).

尺寸變化率(%)=[(L0-L1)/L0]×100 (c) Dimensional change rate (%) = [(L0-L1) / L0] × 100 (c)

尺寸變化率的比係由觀看側偏光板的尺寸變化率A、與背面側偏光板所含的吸收型偏光板之尺寸變化率B的值，依下述式(d)求得。 The ratio of the dimensional change ratio is determined by the following formula (d) from the dimensional change ratio A of the viewing-side polarizing plate and the value of the dimensional change ratio B of the absorbing polarizing plate included in the back-side polarizing plate.

尺寸變化率的比=A/B (d) Ratio of dimensional change rate = A / B (d)

再者，測定尺寸變化率的偏光板之層構成，係於偏光膜的單面或兩面貼合保護膜者，用以貼合於液晶面板的黏著劑層或其他膜，係在除去的狀態下進行測定。背面側偏光板為吸收型偏光板及增亮膜的積層體時，測定貼合增亮膜前的吸收型偏光板、或除去增亮膜後殘留的吸收型偏光板之尺寸變化率。 In addition, the layer structure of the polarizing plate for measuring the dimensional change rate is applied to the adhesive layer or other film of the liquid crystal panel in a state in which the polarizing film is bonded to the single or both surfaces of the polarizing film, and is removed. The measurement was carried out. When the back side polarizing plate is a laminate of an absorbing polarizing plate and a brightness enhancement film, the dimensional change rate of the absorbing polarizing plate before the brightness enhancing film is attached or the absorbing polarizing plate remaining after removing the brightness enhancing film is measured.

[實施例] [Examples]

以下，顯示實施例，更具體地說明本發明，但本發明不限於該等之例。例中，表示含量至使用量的份及%，只要無特別說明，為重量基準。再者，以下的例之各物性的測定，依以下的方法進行。 Hereinafter, the present invention will be described more specifically by way of examples, but the invention is not limited to the examples. In the examples, the parts and % of the content to the amount used are indicated on a weight basis unless otherwise specified. In addition, the measurement of each physical property of the following examples was performed by the following methods.

(1)厚度的測定： (1) Determination of thickness:

使用尼康(Nikon)公司製的數位測微器“MH-15M”進行測定。 The measurement was performed using a digital micrometer "MH-15M" manufactured by Nikon Corporation.

(2)面內遲滯及厚度方向遲滯的測定： (2) Determination of in-plane hysteresis and thickness direction hysteresis:

以王子計測機器公司製的平行尼柯爾旋轉法作為原理的相位差計“KORBRA(登記商標)-WPR”，於23℃的溫度，測定在波長590nm的面內遲滯及厚度方向遲滯。 The phase difference meter "KORBRA (registered trademark) - WPR" which is a principle of the parallel Nikon rotation method manufactured by Oji Scientific Instruments Co., Ltd. was used to measure the in-plane hysteresis and the thickness direction hysteresis at a wavelength of 590 nm at a temperature of 23 °C.

(3)尺寸變化率 (3) Dimensional change rate

使用尼康公司製的二維測定器“NEXIV VMR-12072”進行測定。 The measurement was performed using a two-dimensional measuring device "NEXIV VMR-12072" manufactured by Nikon Corporation.

(4)偏光板的翹曲量的測定 (4) Determination of the amount of warpage of the polarizing plate

所製作的液晶面板靜置於85℃的環境下240小時後，以觀看側偏光板為上側，放置於尼康公司製的二維測定器“NEXIV VMR-12072”的測定台上。然後，聚焦於測定台的表面，以此處作為基準，聚焦於液晶面板的4角、4邊的各中央及液晶面板表面的中央，測定從作為基準的焦點的距離後，從測定台的距離，以絕對值最長的距離作為翹曲量。 The produced liquid crystal panel was left to stand in an environment of 85 ° C for 240 hours, and then placed on the measuring table of the two-dimensional measuring device "NEXIV VMR-12072" manufactured by Nikon Corporation, with the viewing side polarizing plate as the upper side. Then, focusing on the surface of the measuring table, focusing on the center of each of the four corners and four sides of the liquid crystal panel and the center of the surface of the liquid crystal panel, and measuring the distance from the measuring table after the distance from the reference focus is used as a reference. The longest distance in absolute value is used as the amount of warpage.

[製造例1]偏光膜1的製作 [Manufacturing Example 1] Production of Polarizing Film 1

將厚度30μm的聚乙烯醇膜(平均聚合度約2400、皂化度99.9莫耳%以上)藉由乾式延伸進行約4倍的單軸延伸，進一步直接保持拉緊的狀態下，浸漬於40℃的純水40秒後，於28℃浸漬於碘/碘化鉀/水的重量比為0.052/5.7/100的水溶液中30秒，進行染色處理。然後，於70℃浸漬於碘化鉀/硼酸/水的重量比為11.0/6.2/100的水溶液中120秒。接著，以8℃的純水洗淨15秒後，在保持300N的張力的狀態下，於60℃下乾燥50秒，然後於75℃下乾燥20秒，得到碘吸附定向於聚乙烯醇膜的厚度12μm之吸收型偏光膜。 A polyvinyl alcohol film having a thickness of 30 μm (having an average degree of polymerization of about 2400 and a degree of saponification of 99.9 mol% or more) was uniaxially stretched by about 4 times by dry stretching, and further immersed in a state of being tightly immersed at 40 ° C. After 40 seconds of pure water, it was immersed in an aqueous solution of iodine/potassium iodide/water in a weight ratio of 0.052/5.7/100 at 28 ° C for 30 seconds to carry out a dyeing treatment. Then, it was immersed in an aqueous solution of potassium iodide/boric acid/water in a weight ratio of 11.0/6.2/100 at 70 ° C for 120 seconds. Then, after washing with pure water of 8 ° C for 15 seconds, the film was dried at 60 ° C for 50 seconds while maintaining a tension of 300 N, and then dried at 75 ° C for 20 seconds to obtain an iodine adsorption orientation to the polyvinyl alcohol film. An absorbing polarizing film having a thickness of 12 μm.

[製造例2]水系接著劑的製作 [Production Example 2] Production of a water-based adhesive

對水100重量份，溶解3重量份的羧基改質聚乙烯醇[從Kuraray股份公司取得之商品名「KL-318」]，於該水溶 液中添加1.5重量份的水溶性環氧樹脂的聚醯胺環氧系添加劑〔從田岡化學工業公司取得的商品名「SUMIREZ RESIN(登記商標)650(30)」、固體成分濃度30重量%的水溶液〕，調製水系接著劑。 100 parts by weight of water, 3 parts by weight of carboxyl modified polyvinyl alcohol [trade name "KL-318" obtained from Kuraray Co., Ltd.] was dissolved in the water. To the liquid, 1.5 parts by weight of a water-soluble epoxy resin-based polyamine-based epoxy-based additive ("SUMIREZ RESIN (registered trademark) 650 (30)", which is obtained from the company of Takaoka Chemical Industry Co., Ltd., and a solid concentration of 30% by weight. Aqueous solution], a water-based adhesive was prepared.

[黏著劑A、B] [Adhesive A, B]

準備以下3種類的黏著劑。 Prepare the following three types of adhesives.

黏著劑A：厚度20μm的薄片黏著劑〔Lintec公司製「NCF #KT」〕 Adhesive A: Sheet adhesive of 20 μm thickness [NCF #KT" by Lintec Co., Ltd.

黏著劑B：厚度5μm的薄片黏著劑〔Lintec公司製「NCF #L2」〕 Adhesive B: sheet adhesive having a thickness of 5 μm [NCF #L2" manufactured by Lintec Co., Ltd.]

黏著劑C：厚度15μm的薄片黏著劑〔Lintec公司製「NCF #L1」〕 Adhesive C: sheet adhesive having a thickness of 15 μm [NCF #L1" manufactured by Lintec Co., Ltd.]

[保護膜A、C、D] [Protective film A, C, D]

準備以下3種類的保護膜。 Prepare the following three types of protective films.

保護膜A：柯尼卡美能達股份公司製的附硬塗層的三乙醯基纖維素膜；25KCHCN-TC(厚度32μm) Protective film A: a hard-coated triethylenesulfonated cellulose film made by Konica Minolta Co., Ltd.; 25KCHCN-TC (thickness 32 μm)

保護膜C：日本ZEON股份公司製的環狀聚烯烴系樹脂膜；ZF14-013(厚度23μm、在波長590nm的面內相位差值=0.5nm、在波長590nm的厚度方向相位差=4.3nm) Protective film C: a cyclic polyolefin resin film manufactured by Japan ZEON Co., Ltd.; ZF14-013 (thickness 23 μm, in-plane retardation value at a wavelength of 590 nm = 0.5 nm, thickness direction at a wavelength of 590 nm = 4.3 nm)

保護膜D：柯尼卡美能達股份公司製的三乙醯基纖維素膜；KC2UA(厚度25μm) Protective film D: triethylenesulfonyl cellulose film manufactured by Konica Minolta Co., Ltd.; KC2UA (thickness 25 μm)

[增亮膜A] [Brightness Film A]

準備以下的增亮膜。 Prepare the following brightness enhancement film.

增亮膜A：厚度26μm的增亮膜(3M公司製、商品名 Advanced Polarized Film,Version 3) Brightening film A: Brightening film with a thickness of 26 μm (made by 3M Company, trade name) Advanced Polarized Film, Version 3)

[製造例3]觀看側偏光板1的製作 [Manufacturing Example 3] Production of Viewing Side Polarizing Plate 1

對保護膜A進行皂化處理，於保護膜C的一表面進行電暈處理。以保護膜A的三乙醯基纖維素面及保護膜C的電暈處理面分別成為與偏光膜1的貼合面之方式，以水系接著劑貼合保護膜A、偏光膜1、保護膜C，進行乾燥處理，得到觀看側偏光板1。 The protective film A is subjected to saponification treatment, and corona treatment is performed on one surface of the protective film C. The protective film A, the polarizing film 1, and the protective film C are bonded to the polarizing film 1 by a water-based adhesive, in which the triacetyl cellulose surface of the protective film A and the corona-treated surface of the protective film C are bonded to the polarizing film 1, respectively. The drying treatment was carried out to obtain a viewing-side polarizing plate 1.

觀看側偏光板1的MD方向的尺寸變化率為1.4%。再者，藉由調整上述乾燥處理之乾燥時間，調整尺寸變化率。 The dimensional change rate in the MD direction of the viewing side polarizing plate 1 was 1.4%. Furthermore, the dimensional change rate is adjusted by adjusting the drying time of the drying process described above.

進而，於觀看側偏光板1的保護膜C上，貼合黏著劑A，形成黏著劑層。此時，於保護膜表面及黏著劑表面預先進行電暈處理。 Further, on the protective film C of the viewing-side polarizing plate 1, the adhesive A is bonded to form an adhesive layer. At this time, corona treatment was performed in advance on the surface of the protective film and the surface of the adhesive.

[製造例4至10]觀看側偏光板2至8的製作 [Manufacturing Examples 4 to 10] Production of Viewing Side Polarizing Plates 2 to 8

除了調整上述乾燥處理之乾燥時間，使MD方向(吸收軸方向)的尺寸變化率為相異者以外，其餘係與製造例3同樣地分別製作觀看側偏光板2至8，然後，於保護膜C上貼合黏著劑A，形成黏著劑層。觀看側偏光板2至8的尺寸變化率係如以下。 The viewing-side polarizing plates 2 to 8 were produced in the same manner as in Production Example 3, except that the drying time of the drying treatment was adjusted, and the dimensional change rates in the MD direction (absorption axis direction) were different. Adhesive A is applied to C to form an adhesive layer. The dimensional change rate of the viewing side polarizing plates 2 to 8 is as follows.

觀看側偏光板2：1.28 Viewing side polarizer 2: 1.28

觀看側偏光板3：1.11 Viewing side polarizer 3: 1.11

觀看側偏光板4：1.05 Viewing side polarizer 4:1.05

觀看側偏光板5：0.99 View side polarizer 5: 0.99

觀看側偏光板6：0.88 Viewing side polarizer 6: 0.88

觀看側偏光板7：1.63 Viewing side polarizer 7: 1.63

觀看側偏光板8：0.76 Viewing side polarizer 8: 0.76

[製造例11]背面側偏光板1的製作 [Manufacturing Example 11] Production of Back Side Polarizing Plate 1

對保護膜D進行皂化處理，於保護膜C的一表面進行電暈處理。以保護膜D的三乙醯基纖維素面及保護膜C的電暈處理面分別成為與偏光膜1的貼合面之方式，以水系接著劑貼合保護膜D、偏光膜1、保護膜C，得到吸收型偏光板。所得之吸收型偏光板的吸收軸方向的尺寸變化率為1.25%。然後，於所得之吸收型偏光板的保護膜D面貼合黏著劑B，形成黏著劑層。此時，於保護膜D的表面及黏著劑B的表面預先進行電暈處理。然後，黏著劑B之與貼合有保護膜D的面為相反側的面，貼合增亮膜A，製作背面側偏光板1。此時，於增亮膜A的表面預先進行電暈處理。 The protective film D is subjected to saponification treatment, and corona treatment is performed on one surface of the protective film C. The protective film D, the polarizing film 1, and the protective film C are bonded to each other by a water-based adhesive in which the triacetyl cellulose surface of the protective film D and the corona-treated surface of the protective film C are bonded to the polarizing film 1, respectively. , an absorption type polarizing plate is obtained. The dimensional change rate of the absorption-type polarizing plate obtained in the absorption axis direction was 1.25%. Then, the adhesive B was bonded to the surface of the protective film D of the obtained absorptive polarizing plate to form an adhesive layer. At this time, corona treatment is performed in advance on the surface of the protective film D and the surface of the adhesive B. Then, the surface of the adhesive B on the side opposite to the surface on which the protective film D is bonded is bonded to the brightness enhancement film A to form the back side polarizing plate 1. At this time, the surface of the brightness enhancement film A was subjected to corona treatment in advance.

於如此方式所得之背面側偏光板1的保護膜C面貼合黏著劑A，形成黏著劑層。此時，也於保護膜C的表面及黏著劑A的表面預先進行電暈處理。 The adhesive A was bonded to the surface of the protective film C of the back side polarizing plate 1 obtained in this manner to form an adhesive layer. At this time, corona treatment was also performed in advance on the surface of the protective film C and the surface of the adhesive A.

[製造例12]背面側偏光板2的製作 [Manufacturing Example 12] Production of Back Side Polarizing Plate 2

對保護膜D進行皂化處理，於保護膜C的一表面進行電暈處理。保護膜D的三乙醯基纖維素面及保護膜C的電暈處理面分別成為與偏光膜1的貼合面，以水系接著劑貼合保護膜D、偏光膜1、保護膜C，進行乾燥處理，得到吸收型偏光板。所得之吸收型偏光板的吸收軸方向的尺寸變化率為0.91%。再者，藉由調整上述乾燥處理之乾燥時間， 調整尺寸變化率。然後，於所得之吸收型偏光板的保護膜D面，貼合黏著劑C，形成黏著劑層。此時，於保護膜D的表面及黏著劑C的表面預先進行電暈處理。然後，黏著劑C之與貼合有保護膜D的面為相反側的面，貼合增亮膜A，製作背面側偏光板2。此時，於增亮膜A的表面預先進行電暈處理。於如此方式所得之背面側偏光板2的保護膜C面貼合黏著劑A，形成黏著劑層。此時，也於保護膜C的表面及黏著劑A的表面，預先進行電暈處理。 The protective film D is subjected to saponification treatment, and corona treatment is performed on one surface of the protective film C. The triacetyl cellulose surface of the protective film D and the corona-treated surface of the protective film C are bonded to the polarizing film 1, and the protective film D, the polarizing film 1, and the protective film C are bonded together with a water-based adhesive to be dried. The treatment was carried out to obtain an absorbing polarizing plate. The dimensional change rate of the absorption-type polarizing plate obtained in the absorption axis direction was 0.91%. Furthermore, by adjusting the drying time of the above drying process, Adjust the dimensional change rate. Then, on the surface of the protective film D of the obtained absorption type polarizing plate, the adhesive C was bonded to form an adhesive layer. At this time, corona treatment is performed in advance on the surface of the protective film D and the surface of the adhesive C. Then, the surface of the adhesive C on the side opposite to the surface on which the protective film D is bonded is bonded to the brightness enhancement film A to form the back side polarizing plate 2. At this time, the surface of the brightness enhancement film A was subjected to corona treatment in advance. The adhesive A was bonded to the surface of the protective film C of the back side polarizing plate 2 obtained in this manner to form an adhesive layer. At this time, corona treatment was also performed in advance on the surface of the protective film C and the surface of the adhesive A.

[製造例13]背面側偏光板3的製作 [Production Example 13] Production of Back Side Polarizing Plate 3

對保護膜D進行皂化處理，於保護膜C的一表面進行電暈處理。以保護膜D的三乙醯基纖維素面及保護膜C的電暈處理面分別成為與偏光膜1的貼合面之方式，以水系接著劑貼合保護膜D、偏光膜1、保護膜C，進行乾燥處理，得到吸收型偏光板。所得之吸收型偏光板的吸收軸方向的尺寸變化率為0.91%。再者，藉由調整上述乾燥處理之乾燥時間，調整尺寸變化率。然後，於所得之吸收型偏光板的保護膜D面貼合黏著劑A，形成黏著劑層。此時，於保護膜D的表面及黏著劑A的表面預先進行電暈處理。然後，在黏著劑A之與貼合有保護膜D的面為相反側的面，貼合增亮膜A，製作背面側偏光板3。此時，於增亮膜A的表面預先進行電暈處理。於如此方式所得之背面側偏光板3的保護膜C面貼合黏著劑A，形成黏著劑層。此時，也於保護膜C的表面及黏著劑A的表面，預先進行電暈處理。 The protective film D is subjected to saponification treatment, and corona treatment is performed on one surface of the protective film C. The protective film D, the polarizing film 1, and the protective film C are bonded to each other by a water-based adhesive in which the triacetyl cellulose surface of the protective film D and the corona-treated surface of the protective film C are bonded to the polarizing film 1, respectively. Drying treatment was carried out to obtain an absorbing polarizing plate. The dimensional change rate of the absorption-type polarizing plate obtained in the absorption axis direction was 0.91%. Furthermore, the dimensional change rate is adjusted by adjusting the drying time of the drying process described above. Then, the adhesive A was bonded to the surface of the protective film D of the obtained absorptive polarizing plate to form an adhesive layer. At this time, corona treatment is performed in advance on the surface of the protective film D and the surface of the adhesive A. Then, the brightness enhancement film A is bonded to the surface of the adhesive A on the side opposite to the surface to which the protective film D is bonded, and the back side polarizing plate 3 is produced. At this time, the surface of the brightness enhancement film A was subjected to corona treatment in advance. The adhesive A was bonded to the surface of the protective film C of the back side polarizing plate 3 obtained in this manner to form an adhesive layer. At this time, corona treatment was also performed in advance on the surface of the protective film C and the surface of the adhesive A.

[液晶胞] [liquid crystal cell]

從Google Inc公司製的Nexus7的液晶面板，剝離觀看側偏光板及背面側偏光板，得到液晶胞。 The liquid crystal cell was obtained by peeling off the viewing side polarizing plate and the back side polarizing plate from the liquid crystal panel of the Nexus 7 manufactured by Google Inc.

[實施例1] [Example 1]

將觀看側偏光板1對液晶胞的長邊以偏光膜的吸收軸成為平行之方式裁切成對角7吋的大小，將背面側偏光板1對液晶胞的短邊以偏光膜的吸收軸成為平行之方式裁切成對角7吋的大小。如此方式製作的偏光板隔著黏著劑分別貼合於液晶胞，製作液晶面板。觀看側偏光板與背面側偏光板的尺寸變化率之比為1.12。而且，從增亮膜至液晶胞的距離為85μm。 The viewing side polarizing plate 1 cuts the long side of the liquid crystal cell into a diagonal of 7 以 so that the absorption axis of the polarizing film becomes parallel, and the rear side polarizing plate 1 has the absorption axis of the polarizing film on the short side of the liquid crystal cell. It is cut into a diagonal of 7 inches in a parallel manner. The polarizing plate produced in this manner was bonded to the liquid crystal cell via an adhesive, and a liquid crystal panel was produced. The ratio of the dimensional change ratio of the viewing side polarizing plate to the back side polarizing plate was 1.12. Moreover, the distance from the brightness enhancement film to the liquid crystal cell was 85 μm.

如此方式所製作的液晶面板於85℃的環境下靜置240小時後，測定翹曲量，為0.4mm。 The liquid crystal panel produced in this manner was allowed to stand in an environment of 85 ° C for 240 hours, and then the amount of warpage was measured to be 0.4 mm.

[實施例2至8、比較例1至2] [Examples 2 to 8, Comparative Examples 1 to 2]

除使用表1所示的觀看側偏光板與背面側偏光板以外，其餘係與實施例1同樣地，製作液晶面板，測定液晶面板的翹曲量。 A liquid crystal panel was produced in the same manner as in Example 1 except that the viewing-side polarizing plate and the back-side polarizing plate shown in Table 1 were used, and the amount of warpage of the liquid crystal panel was measured.

實施例1至8、比較例1至2所使用的觀看側偏光板的吸收軸方向中之尺寸變化率、及背面側偏光板所含的吸收型偏光板的吸收軸方向之尺寸變化率、從背面側偏光板之增亮膜至液晶胞的距離以及尺寸變化率的比，彙整於表1。 The dimensional change ratio in the absorption axis direction of the viewing-side polarizing plate used in Examples 1 to 8 and Comparative Examples 1 to 2, and the dimensional change rate in the absorption axis direction of the absorption-type polarizing plate included in the back-side polarizing plate, The ratio of the distance from the brightness enhancement film to the liquid crystal cell of the back side polarizing plate and the dimensional change rate is summarized in Table 1.

[產業上的利用可能性] [Industry use possibility]

根據本發明，可得到一種液晶面板，其係可消除液晶面板在高溫環境下的翹曲，且在高溫環境下收納於最終製品的機殼。 According to the present invention, it is possible to obtain a liquid crystal panel which can eliminate the warpage of the liquid crystal panel in a high temperature environment and which is housed in the casing of the final product in a high temperature environment.

30‧‧‧觀看側偏光板 30‧‧‧ viewing side polarizer

31a、31b、51a、51b‧‧‧保護膜 31a, 31b, 51a, 51b‧‧‧ protective film

32、52‧‧‧偏光膜 32, 52‧‧‧ polarizing film

35‧‧‧表面處理層 35‧‧‧Surface treatment layer

33、53‧‧‧黏著劑層 33, 53‧‧‧Adhesive layer

50‧‧‧吸收型偏光板 50‧‧‧Absorbing polarizer

54‧‧‧接著層 54‧‧‧Next layer

60‧‧‧背面側偏光板 60‧‧‧Back side polarizer

61‧‧‧增亮膜 61‧‧‧Brightening film

Claims (4)

一種偏光板之套組，其係配置於液晶胞的觀看側的觀看側偏光板與配置於液晶胞的背面側之背面側偏光板之套組，其中，前述背面側偏光板係具有增亮膜與吸收型偏光板經積層的構成，配置於前述液晶胞的背面側時，從接觸前述液晶胞的表面至前述增亮膜的距離為100μm以下，將前述觀看側偏光板於85℃加熱100小時之時的吸收軸方向之尺寸變化率、與將前述背面側偏光板所含的吸收型偏光板於85℃加熱100小時之時的吸收軸方向之尺寸變化率的比為0.62以上且1.25以下。 A kit of polarizing plates disposed on a viewing side polarizing plate on a viewing side of a liquid crystal cell and a rear side polarizing plate disposed on a back side of the liquid crystal cell, wherein the back side polarizing plate has a brightness enhancing film When the absorption-type polarizing plate is laminated on the back side of the liquid crystal cell, the distance from the surface of the liquid crystal cell to the brightness enhancement film is 100 μm or less, and the viewing-side polarizing plate is heated at 85 ° C for 100 hours. The ratio of the dimensional change of the absorption axis direction at the time of the absorption axis direction of the absorption-type polarizing plate contained in the back side polarizing plate to the absorption axis direction at 85 ° C for 100 hours is 0.62 or more and 1.25 or less. 如申請專利範圍第1項所述之偏光板之套組，其中，前述觀看側偏光板與前述背面側偏光板分別具有偏光膜，前述觀看側偏光板具有的偏光膜之厚度與前述背面側偏光板具有的偏光膜之厚度皆為15μm以下。 The polarizing plate set according to the first aspect of the invention, wherein the viewing side polarizing plate and the back side polarizing plate respectively have a polarizing film, and the viewing side polarizing plate has a thickness of the polarizing film and the back side polarizing The thickness of the polarizing film of the board is 15 μm or less. 一種液晶面板，係包含申請專利範圍第1或2項所述之偏光板之套組及液晶胞，其中，前述觀看側偏光板係其吸收軸與前述液晶胞的長邊方向約略平行，前述背面側偏光板係其吸收軸與前述液晶胞的短邊方向大致呈平行。 A liquid crystal panel comprising the polarizing plate set and the liquid crystal cell according to claim 1 or 2, wherein the viewing-side polarizing plate has an absorption axis which is approximately parallel to a longitudinal direction of the liquid crystal cell, and the back surface The side polarizer has an absorption axis substantially parallel to the short side direction of the liquid crystal cell. 如申請專利範圍第3項所述之液晶面板，其中，前述觀看側偏光板配置於前述液晶胞的觀看側，前述背面側偏光板配置於前述液晶胞的背面 側，於85℃加熱240小時之時該液晶面板的翹曲量的絕對值為0.5mm以下。 The liquid crystal panel according to claim 3, wherein the viewing-side polarizing plate is disposed on a viewing side of the liquid crystal cell, and the back-side polarizing plate is disposed on a back surface of the liquid crystal cell On the side, the absolute value of the warpage amount of the liquid crystal panel when heated at 85 ° C for 240 hours was 0.5 mm or less.
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KR101669320B1 (en) * 2013-12-20 2016-10-25 제일모직주식회사 Module for liquid crystal display apparatus and liquid crystal display apparatus comprising the same
KR20150076564A (en) * 2013-12-27 2015-07-07 제일모직주식회사 Module for liquid crystal display and liquid crystal display apparatus comprising the same
JP2015152656A (en) * 2014-02-12 2015-08-24 住友化学株式会社 Polarizing plate and liquid crystal display device using the same
CN206248955U (en) * 2015-12-04 2017-06-13 住友化学株式会社 Polarization plates group and liquid crystal panel

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JP2021036328A (en) 2021-03-04
JP2017107236A (en) 2017-06-15
CN106842676B (en) 2018-10-12
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KR101781308B1 (en) 2017-09-22
CN106842676A (en) 2017-06-13

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