TWI509297B - Thin type polarizer and a display used thereof - Google Patents
Thin type polarizer and a display used thereof Download PDFInfo
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- TWI509297B TWI509297B TW097103544A TW97103544A TWI509297B TW I509297 B TWI509297 B TW I509297B TW 097103544 A TW097103544 A TW 097103544A TW 97103544 A TW97103544 A TW 97103544A TW I509297 B TWI509297 B TW I509297B
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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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/32—Holograms used as optical elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
本發明係關於液晶顯示裝置等之畫像顯示裝置所使用的偏光板、與配置此偏光板之畫像顯示裝置。本發明的偏光板，因為是薄型輕量化的構成，且高溫環境下耐久性優異，故特別適合於謀求模組本身的薄型輕量化及耐久性的提高之攜帶型用途的各種畫像顯示裝置。The present invention relates to a polarizing plate used in an image display device such as a liquid crystal display device, and an image display device in which the polarizing plate is disposed. Since the polarizing plate of the present invention has a thin and lightweight structure and is excellent in durability in a high-temperature environment, it is particularly suitable for various image display devices for portable use in which the module itself is thin, lightweight, and durable.
液晶顯示裝置，自以往已被使用於桌上計算機和電子錶等，但近年，其用途乃急劇擴展。即，由行動電話等之攜帶型機器至大型電視機為止，不論畫面尺寸，乃使用液晶顯示裝置。又，於液晶顯示裝置以外，有機電致發光(有機EL)顯示裝置亦以攜帶型用途為中心而有增加之傾向。此等畫像顯示裝置所使用的偏光板亦不僅需求增大，且要求適用於各用途的性能。Liquid crystal display devices have been used in desktop computers and electronic watches, etc., but their use has expanded dramatically in recent years. In other words, from a portable device such as a mobile phone to a large-sized television, a liquid crystal display device is used regardless of the screen size. Further, in addition to the liquid crystal display device, the organic electroluminescence (organic EL) display device tends to increase mainly in the portable type. The polarizing plates used in such image display devices are not only required to be increased, but also require performance suitable for each use.
如上述畫像顯示裝置所一般廣泛使用的偏光板，係將聚乙烯醇系樹脂薄膜經二色性色素吸黏配向之偏光子兩面，透過液狀之接黏劑，層合以三乙醯纖維素薄膜所代表之透明保護層之構成則可製造。以此狀態，或者以視需要透過黏著劑或接黏劑貼合具有光學特性之相位差薄膜和光學補償薄膜等之各種光學層的狀態，貼合至液晶胞和有機EL顯示元件等之畫像顯示元件供使用。A polarizing plate widely used in the image display device described above is a polyvinyl alcohol-based resin film which is adhered to both sides of a polarizer by a dichroic dye, and is permeable to a liquid adhesive to laminate triacetyl cellulose. The composition of the transparent protective layer represented by the film can be manufactured. In this state, or in a state in which various optical layers such as a retardation film and an optical compensation film having optical characteristics are bonded together by an adhesive or an adhesive as needed, the image is displayed on the liquid crystal cell and the organic EL display element. Components are available for use.
圖4中，將此類先前的偏光板及於其層合相位差板之 複合偏光板的一般例以剖面模式圖示出。即，於偏光子1之兩面設置透明保護層4、5，構成偏光子11。又，於其一之透明保護層5側透過感壓接黏劑層3貼合相位差板6，再於其外側，設置用以貼合至畫像顯示元件等之感壓接黏劑層7，構成複合偏光板17。其通例為於感壓接黏劑層7的外側，設置將其表面予以假黏保護之間隔件9a直到貼合至畫像顯示元件等。In Figure 4, such a prior polarizing plate and its laminated phase difference plate are A general example of a composite polarizing plate is shown in a sectional mode. That is, the transparent protective layers 4 and 5 are provided on both surfaces of the polarizer 1, and the polarizer 11 is formed. Further, the phase difference plate 6 is bonded to the side of the transparent protective layer 5 through the pressure-sensitive adhesive layer 3, and the pressure-sensitive adhesive layer 7 for bonding to the image display element or the like is provided on the outer side thereof. The composite polarizing plate 17 is formed. In the usual example, the spacer 9a for falsely adhering the surface thereof is provided on the outer side of the pressure-sensitive adhesive layer 7, until it is attached to an image display element or the like.
然而，最近，於行動電話等之攜帶型用途的畫像顯示裝置中，由設計面和攜帶性方面而言，持續發展將模件全體變薄且薄肉化。當然，關於其所使用的偏光板亦期望更加薄型輕量化。However, recently, in the image display device for portable use such as a mobile phone, the entire surface of the module has been thinned and thinned in terms of design surface and portability. Of course, the polarizing plate used therefor is also expected to be thinner and lighter.
又，因攜帶化而經歷各種使用場所，故要求薄型輕量構造，並且亦要求高於先前的耐久性。Moreover, since it is subjected to various use places due to portability, a thin and lightweight structure is required, and it is also required to have higher durability than the previous one.
如上述應付薄型化和輕量化之要求，若將偏光板之偏光子或透明保護層單純地變薄，則由偏光子具有於其延伸方向上易裂開的特性方面，和透過接黏劑層合透明保護層之方式作業時的操作性等方面而言，於取得薄型輕量偏光板上具有極限。又，亦有如圖4所示般，取代於偏光子1之兩面設置透明保護層4、5之構成，且省略相位差板6等之其他光學薄膜貼合側的透明保護層5，對偏光子1透過接黏劑或感壓接黏劑直接層合相位差板6等之其他光學薄膜，嘗試圖謀偏光板的薄肉化。但是，此情況，特別於高溫環境下放置時，偏光子1之伸縮所伴隨的尺寸變化大，具有耐久性不一定充分的問題。As described above for the requirements of thinning and light weight, if the polarizer or the transparent protective layer of the polarizing plate is simply thinned, the polarizer has a property of being easily cracked in the extending direction thereof, and the adhesive layer is transmitted through. In terms of operability at the time of operation in the form of a transparent protective layer, there is a limit in obtaining a thin lightweight polarizing plate. Further, as shown in FIG. 4, the transparent protective layers 4 and 5 are provided instead of the polarizer 1, and the transparent protective layer 5 on the other optical film bonding side such as the phase difference plate 6 is omitted. 1 Directly laminating other optical films such as the phase difference plate 6 through an adhesive or a pressure sensitive adhesive, and attempting to plan the thinning of the polarizing plate. However, in this case, in particular, when placed in a high-temperature environment, the dimensional change accompanying the expansion and contraction of the polarizer 1 is large, and the durability is not necessarily sufficient.
另一方面，且以往亦已提案將作為透明保護層之三乙醯纖維素薄膜以其他樹脂更換。例如，於特開2000-199819號公報(專利文獻1)中，揭示於親水性高分子所構成之偏光子的單面或兩面，以不溶解此薄膜之溶劑所構成的樹脂溶液塗佈，作成附有透明薄膜層的偏光板，亦記載於此透明薄膜層上配置透明薄膜所構成的保護層。於特開2000-321430號公報(專利文獻2)中，揭示於聚乙烯醇系偏光子之至少一面，透過聚乙烯醇系接黏劑與二液型接黏劑之混合物所構成的接黏劑，層合環狀烯烴系樹脂所構成之保護膜的偏光板。又，於特開2001-305345號公報(專利文獻3)中，揭示於聚乙烯醇系薄片所構成之偏光子的至少一面，透過水性高分子-異氰酸酯系接黏劑，層合原冰片烯系樹脂所構成之保護薄膜的偏光板。On the other hand, it has been proposed in the past to replace the triacetyl cellulose film as a transparent protective layer with another resin. For example, JP-A-2000-199819 (Patent Document 1) discloses that a resin solution composed of a solvent which does not dissolve the film is applied to one surface or both surfaces of a polarizer composed of a hydrophilic polymer, and is prepared. A polarizing plate with a transparent film layer is also described as a protective layer formed by disposing a transparent film on the transparent film layer. JP-A-2000-321430 (Patent Document 2) discloses an adhesive comprising a mixture of a polyvinyl alcohol-based adhesive and a two-liquid adhesive on at least one side of a polyvinyl alcohol-based polarizer. A polarizing plate in which a protective film made of a cyclic olefin resin is laminated. In JP-A-2001-305345 (Patent Document 3), it is disclosed that at least one surface of a polarizer composed of a polyvinyl alcohol-based sheet is permeable to an aqueous polymer-isocyanate-based adhesive, and the original borneol-based resin is laminated. A polarizing plate of the protective film.
此等專利文獻1~3所揭示之透明薄膜或環狀烯烴系樹脂薄膜(原冰片烯系樹脂薄膜亦大約同義)，若以具有相位差板機能者所構成，則可削減貼合至畫像顯示元件之構材並作成薄型的偏光板。The transparent film or the cyclic olefin-based resin film disclosed in Patent Documents 1 to 3 (the original borneol-based resin film is also approximately the same), and if it is composed of a phase difference plate function, the bonding can be reduced to the image display. The member of the component is made into a thin polarizing plate.
然而，偏光子與透明高分子薄膜之層合上使用接黏劑時，係成為將此接黏劑塗佈至偏光子，令其乾燥或硬化後，層合高分子薄膜之方式，故薄膜的光學軸難對於偏光子之軸以一定角度般層合，特別於輕易形成可用於攜帶型用途之畫像顯示裝置之橢圓或圓偏光型式的複合偏光板上有問題。However, when an adhesive is used for laminating a polarizer and a transparent polymer film, the adhesive is applied to a polarizer, and after drying or hardening, the polymer film is laminated, so that the film is It is difficult for the optical axis to be laminated at a certain angle to the axis of the polarizer, and it is particularly problematic for a composite polarizing plate of an elliptical or circularly polarized type which can be easily formed into an image display device for portable use.
更且，亦已知使用黏著劑(感壓接黏劑)，如前述將 原冰片烯系樹脂薄膜貼合至偏光子。例如，於特開平6-51117號公報(專利文獻4)中，揭示於偏光子之至少一面將熱可塑性飽和原冰片烯系樹脂薄膜以保護層型式層合的偏光板。又，於特開平8-43812號公報(專利文獻5)中，揭示於偏光子之兩側層合保護薄膜的偏光板中，將其保護薄膜之至少一者，同時以具有相位差薄膜機能者所構成，具有相位差薄膜機能之保護薄膜例可列舉熱可塑性原冰片烯系樹脂。於此些專利文獻4及5中，作為偏光子與原冰片烯系樹脂薄膜層合所用之黏著劑，可列舉天然橡膠、合成橡膠彈性體、氯乙烯/醋酸乙烯酯共聚物、聚乙烯基烷醚、聚丙烯酸酯、改性聚烯烴系樹脂系黏著劑等。但是，任一種公報均限於說明黏著劑層的形成方法或與保護層的層合方法，雖稱實現形成薄型偏光板之目的，但於提高耐久性方面則未明確記述其具體黏著劑的特性或效果。Moreover, it is also known to use an adhesive (pressure-sensitive adhesive) as described above. The original norbornene resin film is bonded to a polarizer. For example, Japanese Laid-Open Patent Publication No. Hei 6-51117 (Patent Document 4) discloses a polarizing plate in which a thermoplastic saturated ornidyl resin film is laminated on at least one surface of a polarizer in a protective layer type. Japanese Patent Publication No. 8-43812 (Patent Document 5) discloses a polarizing plate in which a protective film is laminated on both sides of a polarizer, and at least one of the protective films is provided with a phase difference film function. In the case of the protective film having a phase difference film function, a thermoplastic orthoborne resin is exemplified. In the above-mentioned Patent Documents 4 and 5, examples of the adhesive used for laminating the polarizer and the original borneol-based resin film include natural rubber, synthetic rubber elastomer, vinyl chloride/vinyl acetate copolymer, and polyvinyl alkane. Ether, polyacrylate, modified polyolefin resin-based adhesive, and the like. However, any of the publications is limited to the description of the method of forming the adhesive layer or the method of laminating the protective layer. Although it is said to achieve the purpose of forming a thin polarizing plate, the properties of the specific adhesive are not clearly described in terms of improving durability or effect.
因此，於經由減低構成構件以圖謀薄型化及輕量化之攜帶型用途的偏光子領域中，追求開發出薄且維持良好的耐久性，並且於具有光學特性之高分子薄膜或與其他光學層之層合步驟中亦使用製造自由度高之感壓接黏劑的薄型偏光板。Therefore, in the field of polarizers that reduce the thickness and weight of portable components, it is desired to develop thin and maintain excellent durability, and to have optical properties or other optical layers. A thin polarizing plate for manufacturing a pressure sensitive adhesive having a high degree of freedom is also used in the laminating step.
本發明之目的為對於偏光子之至少單面設置感壓接黏劑層的偏光板，即使於高溫環境下亦可賦予良好的耐久性 ，且令所使用之感壓接黏劑為具有再剝離性下，使得於此層合高分子薄膜時，於偏光子與高分子薄膜之層合步驟中於作業性上不會伴隨煩雜進行製造。本發明之又一目的為對此附有感壓接黏劑之偏光板，層合相位差板等之高分子薄膜，提供可令全體薄肉化的複合偏光板。更且，本發明之又一目的為將此等偏光板或複合偏光板應用至畫像顯示裝置。The object of the present invention is to provide a polarizing plate with a pressure-sensitive adhesive layer on at least one side of a polarizer, which can provide good durability even in a high temperature environment. And the pressure-sensitive adhesive to be used has removability, so that when the polymer film is laminated, the workability is not complicated in the lamination step of the polarizer and the polymer film. . Still another object of the present invention is to provide a polarizing plate with a pressure-sensitive adhesive, a polymer film such as a laminated phase difference plate, and a composite polarizing plate which can make the entire thin meat. Furthermore, it is still another object of the present invention to apply such a polarizing plate or a composite polarizing plate to an image display device.
為了達成上述目的，本發明之偏光板為於偏光子的至少單面設置感壓接黏劑層，此感壓接黏劑層為於23~80℃之溫度範圍中，以顯示0.15~1MPa之貯藏彈性率者所構成。如此，經由設置顯示較高貯藏彈性率之感壓接黏劑層，則可於高溫環境下抑制偏光板的尺寸變化。In order to achieve the above object, the polarizing plate of the present invention is provided with a pressure-sensitive adhesive layer on at least one side of the polarizer, and the pressure-sensitive adhesive layer is in a temperature range of 23 to 80 ° C to display 0.15 to 1 MPa. It is composed of people who store the elastic modulus. As described above, by providing the pressure-sensitive adhesive layer which exhibits a high storage modulus, the dimensional change of the polarizing plate can be suppressed in a high-temperature environment.
有效為於偏光子的單面設置該感壓接黏劑層，且另一面設置由透明樹脂薄膜所構成的保護層。於此偏光板中，偏光子為以對聚乙烯醇系樹脂薄膜，吸黏配向碘和二色性有機染料等之顯示二色性的色素所構成。又，感壓接黏劑層之厚度為1~40μm為佳。更且，感壓接黏劑層為具有再剝離性，於其露出面，存在經聚矽氧系等之脫模劑所處理的間隔件為佳。It is effective to provide the pressure-sensitive adhesive layer on one side of the polarizer and the protective layer made of a transparent resin film on the other side. In the polarizing plate, the polarizer is a dye which exhibits dichroism such as a polyvinyl alcohol-based resin film, an absorbing iodine, and a dichroic organic dye. Further, the thickness of the pressure-sensitive adhesive layer is preferably from 1 to 40 μm. Further, the pressure-sensitive adhesive layer has removability, and a spacer which is treated with a release agent such as polyoxymethylene or the like is preferably present on the exposed surface.
又，若根據本發明，亦提供於具有前述感壓接黏劑層之偏光板的感壓接黏劑層側，配置高分子薄膜的複合偏光板。此處所用之高分子薄膜為以具有面內相位差者所構成 ，兼具保護層與相位差板之機能，可因構材枚數減低而作成薄型輕量化之複合偏光板。又，如此，可作成橢圓或圓偏光型式的薄型複合偏光板。Moreover, according to the present invention, a composite polarizing plate in which a polymer film is disposed on the pressure-sensitive adhesive layer side of the polarizing plate having the pressure-sensitive adhesive layer is also provided. The polymer film used here is composed of those having an in-plane retardation. The function of the protective layer and the phase difference plate can be made into a thin and lightweight composite polarizing plate due to the reduction in the number of members. Further, in this manner, a thin composite polarizing plate of an elliptical or circularly polarized type can be produced.
於上述之偏光板或複合偏光板，亦可再層合顯示其他光學機能的光學層。例如，於偏光子的單面設置該感壓接黏劑層，且另一面設置透明保護層的偏光板，或於其感壓接黏劑層側配置相位差板等之高分子薄膜的複合偏光板中，於偏光子密黏之透明保護層的反面，亦可具有硬塗層、防止反射層、反黏層等之表面處理層。In the above polarizing plate or composite polarizing plate, an optical layer showing other optical functions may be laminated. For example, a polarizing plate provided with a pressure-sensitive adhesive layer on one side of a polarizer and a transparent protective layer on the other surface, or a composite polarized film of a polymer film such as a phase difference plate disposed on the pressure-sensitive adhesive layer side. In the plate, on the reverse side of the transparent protective layer of the polarizer, the surface treatment layer of the hard coat layer, the antireflection layer, the anti-adhesive layer or the like may be provided.
又，於偏光子之單面設置該感壓接黏劑層，視需要於另一面設置透明保護層之偏光板，或於其感壓接黏劑層側配置相位差板等之高分子薄膜的複合偏光板中，於偏光子之該感壓接黏劑層連接面的反側(設置透明保護層時為其外側)，貼合反射板或半穿透反射板，形成反射型或半穿透反射型之薄型複合偏光板亦可。Further, the pressure-sensitive adhesive layer is provided on one side of the polarizer, and a polarizing plate having a transparent protective layer is provided on the other surface as needed, or a polymer film such as a phase difference plate is disposed on the pressure-sensitive adhesive layer side. In the composite polarizing plate, on the opposite side of the connection surface of the pressure-sensitive adhesive layer of the polarizer (the outer side when the transparent protective layer is disposed), the reflective plate or the semi-transmissive reflector is bonded to form a reflective or semi-transparent A reflective thin composite polarizer can also be used.
更且，於偏光子之單面設置該感壓接黏劑層，視需要於另一面設置透明保護層之偏光板，或於其感壓接黏劑層側配置相位差板等之高分子薄膜的複合偏光板中，於偏光子之該感壓接黏劑層連接面的反側(設置透明保護層時為其外側)，貼合提高亮度之薄膜，亦可形成可利用提高亮度系統的薄型複合偏光板。Further, the pressure-sensitive adhesive layer is provided on one side of the polarizer, and a polarizing plate having a transparent protective layer is provided on the other surface as needed, or a polymer film such as a phase difference plate is disposed on the pressure-sensitive adhesive layer side. In the composite polarizing plate, on the opposite side of the connection surface of the pressure-sensitive adhesive layer of the polarizer (the outer side when the transparent protective layer is provided), the film for improving the brightness is attached, and a thin film which can improve the brightness system can be formed. Composite polarizer.
本發明之畫像顯示裝置為具備如液晶胞和有機EL顯示元件之畫像顯示元件，和上述之偏光板或複合偏光板。於此畫像顯示裝置中，於畫像顯示元件之至少單面，配置The image display device of the present invention is an image display element including a liquid crystal cell and an organic EL display element, and the above-described polarizing plate or composite polarizing plate. In this image display device, at least one side of the image display element is arranged
上述之偏光板或複合偏光板。The above polarizing plate or composite polarizing plate.
本發明之偏光板為於偏光子之至少單面，配置於23~80℃之溫度範圍中顯示指定之貯藏彈性率的感壓接黏劑層。其次，於此感壓接黏劑層之外側，將具有其他光學機能之高分子薄膜，例如相位差板予以層合，則可減少貼合至畫像顯示元件之薄膜枚數，可作成更薄型輕量之構成，並且亦可抑制感壓接黏劑層於高溫環境下偏光子收縮所伴隨的尺寸變化，可作成耐久性優良之薄型偏光板及薄型複合偏光板。又，經由將其與液晶胞和有機EL顯示元件等之畫像顯示元件組合，則可取得可薄肉化且耐久性亦優良的畫像顯示裝置。The polarizing plate of the present invention is a pressure-sensitive adhesive layer which exhibits a predetermined storage modulus in a temperature range of 23 to 80 ° C on at least one side of a polarizer. Next, on the outer side of the pressure-sensitive adhesive layer, a polymer film having other optical functions, for example, a phase difference plate, is laminated, whereby the number of films bonded to the image display element can be reduced, and the film can be made thinner and lighter. The composition of the amount can also suppress the dimensional change accompanying the polarization contraction of the pressure-sensitive adhesive layer in a high-temperature environment, and can be used as a thin polarizing plate and a thin composite polarizing plate excellent in durability. Moreover, by combining this with an image display element such as a liquid crystal cell or an organic EL display element, an image display device which can be thinned and excellent in durability can be obtained.
以下，亦一邊適當參照所附圖面，一邊詳細說明本發明。圖1為示出本發明之偏光板之層構成一例的剖面模式圖。參照圖1，本發明之偏光板10為於偏光子1的至少單面設置感壓接黏劑層2。此感壓接黏劑層2為於23~80℃之溫度範圍中顯示0.15~1MPa之貯藏彈性率者所構成。此處所謂「於23~80℃之溫度範圍中顯示0.15~1MPa之貯藏彈性率」，係意指於此範圍之任何溫度中貯藏彈性率均為上述範圍之值。貯藏彈性率通常為伴隨溫度上升而漸減，故若於23℃及80℃中的貯藏彈性率均為上述範圍，則於 此範圍之溫度中，可察見顯示上述範圍的貯藏彈性率。Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a schematic cross-sectional view showing an example of a layer configuration of a polarizing plate of the present invention. Referring to Fig. 1, a polarizing plate 10 of the present invention is provided with a pressure-sensitive adhesive layer 2 on at least one side of a polarizer 1. The pressure-sensitive adhesive layer 2 is composed of a storage modulus of 0.15 to 1 MPa in a temperature range of 23 to 80 °C. Here, the "storage modulus of 0.15 to 1 MPa in the temperature range of 23 to 80 ° C" means that the storage modulus at any temperature in the range is a value within the above range. The storage modulus is generally gradually decreased as the temperature rises. Therefore, if the storage modulus at 23 ° C and 80 ° C is in the above range, then In the temperature of this range, the storage modulus of elasticity showing the above range can be seen.
亦可於偏光子1的兩面設置顯示此類高貯藏彈性率的感壓接黏劑層，但一般，於偏光子1之單面設置顯示如上述貯藏彈性率之感壓接黏劑層2，並於偏光子1之另一面，設置透明樹脂薄膜所構成之保護層4為有利。於感壓接黏劑層2之露出面，配置間隔件9，直到貼合至其他構材為止，將其表面予以假黏保護為其通例。A pressure-sensitive adhesive layer exhibiting such a high storage modulus may be provided on both sides of the polarizer 1, but generally, a pressure-sensitive adhesive layer 2 exhibiting the storage elastic modulus as described above is provided on one side of the polarizer 1 It is advantageous to provide the protective layer 4 composed of a transparent resin film on the other side of the polarizer 1. The spacer 9 is placed on the exposed surface of the pressure-sensitive adhesive layer 2 until it is bonded to other members, and the surface is subjected to false adhesion protection as a general example.
偏光子1為具有由入射之自然光取出直線偏光機能的薄膜，例如，可使用於聚乙烯醇系樹脂薄膜吸黏配向二色性色素的偏光薄膜。構成偏光子1之聚乙烯醇系樹脂，可經由令聚酯酸乙烯酯系樹脂鹼化而取得。聚醋酸乙烯酯系樹脂除了醋酸乙烯酯之單聚物的聚醋酸乙烯酯以外，可例示醋酸乙烯酯及可與其共聚之其他單體的共聚物等。於醋酸乙烯酯共聚之其他單體可列舉例如，不飽和羧酸類、烯烴類、乙烯醚類、不飽和磺酸類、具有銨基之丙烯醯胺類等。聚乙烯醇系樹脂之鹼化度通常為85~100莫耳%左右，較佳為98莫耳%以上。此聚乙烯醇系樹脂亦可再被改性，例如，亦可使用經醛類改性之聚乙烯基甲縮醛和聚乙烯基乙縮醛等。又，聚乙烯醇系樹脂之聚合度通常為1,000~10,000左右，較佳為1,500~5,000左右。The polarizer 1 is a film having a linear polarizing function which is taken out by incident natural light. For example, a polarizing film which can be used for a polyvinyl alcohol-based resin film to adhere to a dichroic dye can be used. The polyvinyl alcohol-based resin constituting the polarizer 1 can be obtained by alkalizing a vinyl acetate-based resin. The polyvinyl acetate-based resin may, for example, be a copolymer of vinyl acetate and another monomer copolymerizable therewith, in addition to polyvinyl acetate of a vinyl acetate monomer. Examples of the other monomer copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group. The degree of alkalinity of the polyvinyl alcohol-based resin is usually about 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be further modified. For example, an aldehyde-modified polyvinyl acetal, a polyvinyl acetal or the like may be used. Further, the degree of polymerization of the polyvinyl alcohol-based resin is usually from about 1,000 to 10,000, preferably from about 1,500 to 5,000.
成膜此類聚乙烯醇系樹脂者，可使用作為偏光子1的原版薄膜。製膜聚乙烯醇系樹脂之方法並無特別限定，可依公知之方法製膜。聚乙烯醇系樹脂所構成的原版薄膜的膜厚並無特別限定，例如為1μm~150μm左右。若考慮延 伸之容易度等，則其膜厚為10μm以上為佳。As the film of such a polyvinyl alcohol-based resin, a master film as the polarizer 1 can be used. The method for forming the polyvinyl alcohol-based resin is not particularly limited, and a film can be formed by a known method. The film thickness of the original film composed of the polyvinyl alcohol-based resin is not particularly limited, and is, for example, about 1 μm to 150 μm. If considering delay It is preferable that the film thickness is 10 μm or more.
偏光子1為經過將此類聚乙烯醇系樹脂薄膜予以單軸延伸之步驟、聚乙烯醇系樹脂薄膜以二色性色素染色令此二色性色素吸黏的步驟，將二色性色素吸黏之聚乙烯醇系樹脂薄膜以硼酸水溶液處理的步驟，及以此硼酸水溶液處理後水洗之步驟，則可製造。二色性色素為使用碘、和二色性之有機染料。The polarizer 1 is a step of uniaxially stretching the polyvinyl alcohol resin film, and the polyvinyl alcohol resin film is dyed by a dichroic dye to adhere the dichroic dye, and the dichroic dye is adsorbed. The polyvinyl alcohol-based resin film can be produced by a step of treating with a boric acid aqueous solution and a step of washing with the aqueous boric acid solution and then washing with water. The dichroic dye is an organic dye using iodine and dichroism.
於偏光子1之至少單面，形成感壓接黏劑層2。所謂感壓接黏劑，係僅押壓下接黏至其他物質之表面，並將其由被黏面拉引剝離之情形中，若於被黏物具有強度則可幾乎不殘留痕跡地除去的黏彈性體，亦被稱為黏著劑。感壓接黏劑層2為將先前畫像顯示裝置所用之各種黏著劑於基質中形成。例如，丙烯酸系、橡膠系、胺基甲酸乙酯系、聚矽氧系、聚乙烯醚等。又，亦可為能量線硬化型、熱硬化型等。其中，亦以透明性、耐候性、耐熱性等優良之丙烯酸系樹脂作為基質聚合物的黏著劑為適當。A pressure-sensitive adhesive layer 2 is formed on at least one side of the polarizer 1. The so-called pressure-sensitive adhesive is a material that adheres to the surface of other substances only under pressure and is peeled off from the surface to be bonded. If the adhesive has strength, it can be removed with almost no trace. Viscoelastic, also known as adhesive. The pressure-sensitive adhesive layer 2 is formed by forming various adhesives used in the prior art image display device in a matrix. For example, an acrylic type, a rubber type, an urethane type, a polyoxyl type, a polyvinyl ether, etc. are mentioned. Further, it may be an energy ray-curing type or a thermosetting type. Among them, an acrylic resin excellent in transparency, weather resistance, heat resistance, and the like is also suitable as an adhesive for the matrix polymer.
丙烯酸系黏著劑並無特別限定，可適當使用(甲基)丙烯酸丁酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸異辛酯、(甲基)丙烯酸2-乙基己酯般之(甲基)丙烯酸酯系基質聚合物、和彼等之(甲基)丙烯酸酯等之使用二種以上的共聚系基質聚合物。更且，於此等基質聚合物中共聚極性單體。極性單體可列舉例如，(甲基)丙烯酸、(甲基)丙烯酸2-羥丙酯、(甲基)丙烯酸2-羥乙酯、(甲基)丙烯醯胺、2-N,N-二甲胺乙基(甲基)丙烯酸酯、縮水 甘油基(甲基)丙烯酸酯般之具有羧基、羥基、醯胺基、胺基、環氧基等之單體。The acrylic adhesive is not particularly limited, and butyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, or 2-ethylhexyl (meth)acrylate can be suitably used. Two or more kinds of copolymerized matrix polymers are used for the (meth)acrylate-based matrix polymer and the (meth)acrylates thereof. Further, a polar monomer is copolymerized in the matrix polymer. Examples of the polar monomer include (meth)acrylic acid, 2-hydroxypropyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, (meth)acrylamide, 2-N,N-di Methylaminoethyl (meth) acrylate, shrinkage A monomer having a carboxyl group, a hydroxyl group, a decylamino group, an amine group, an epoxy group or the like as the glyceryl (meth) acrylate.
此等丙烯酸系黏著劑可單獨使用，但通常併用交聯劑。交聯劑可例示二價或多價金屬離子，於羧基之間形成羧酸金屬鹽者之聚胺化合物，於羧基之間形成醯胺鍵者之聚環氧化合物和聚醇化合物，於羧基之間形成酯鍵者之聚異氰酸酯化合物，於羧基之間形成醯胺鍵者。其中，亦以聚異氰酸酯化合物為廣泛使用作為有機系交聯劑。These acrylic adhesives can be used singly, but usually a crosslinking agent is used in combination. The crosslinking agent may be a polyamine compound in which a divalent or polyvalent metal ion is formed, a metal carboxylate is formed between the carboxyl groups, a polyepoxide compound and a polyhydric alcohol compound are formed between the carboxyl groups, and a carboxyl group is used. A polyisocyanate compound in which an ester bond is formed to form a guanamine bond between carboxyl groups. Among them, polyisocyanate compounds are also widely used as organic crosslinking agents.
所謂能量線硬化型黏著劑，係具有接受紫外線和電子射線等之能量射線照射而硬化之性質，且於能量射線照射前亦具有黏著性且密黏至薄膜等之被黏體，並經由能量射線之照射硬化具有可調整密黏力之性質的黏著劑。能量射線硬化型黏著劑特別以使用紫外線硬化型黏著劑為佳。能量射線硬化型黏著劑，一般為以丙烯酸系黏著劑、和能量射線聚合性化合物作為主成分。通常再配合交聯劑，視需要，亦可配合光啟始劑、光增感劑等。The energy ray-curable adhesive has a property of being cured by irradiation with an energy ray such as an ultraviolet ray or an electron ray, and is also adhered to a film or the like before being irradiated with an energy ray, and is passed through an energy ray. The irradiation hardens the adhesive having the property of adjusting the adhesion. The energy ray-curable adhesive is preferably an ultraviolet curable adhesive. The energy ray-curable adhesive generally contains an acrylic adhesive and an energy ray polymerizable compound as a main component. Usually, a crosslinking agent is further blended, and a light initiator, a photosensitizer, or the like may be blended as needed.
形成感壓接黏劑層2所用之黏著劑組成物中，除了上述之基質聚合物及交聯劑以外，視需要，亦可為了調整黏著劑之黏著力、凝集力、黏性、彈性率、玻璃態化溫度等，配合例如天然物和合成物之樹脂類、賦予黏著性之樹脂、抗氧化劑、染料、顏料、消泡劑、腐蝕劑、光聚合啟始劑等之適當添加劑。更且，亦可含有微粒子作成顯示光散亂性的感壓接黏劑層。In the adhesive composition for forming the pressure-sensitive adhesive layer 2, in addition to the above-mentioned matrix polymer and crosslinking agent, if necessary, in order to adjust the adhesion, cohesive force, viscosity, elastic modulus of the adhesive, A glass transition temperature or the like, and a suitable additive such as a resin of a natural product or a composition, a resin for imparting adhesion, an antioxidant, a dye, a pigment, an antifoaming agent, an etchant, a photopolymerization initiator, and the like. Further, fine particles may be contained to form a pressure-sensitive adhesive layer which exhibits light scattering properties.
本發明中，於偏光子1之至少單面設置的感壓接黏劑 層2，為於23~80℃之溫度範圍中顯示0.15~1MPa之貯藏彈性率者所構成。貯藏彈性率可使用市售之黏彈性測定裝置，例如，如後述之實施例所示般，使用REOMETRIC公司製之黏彈性測定裝置“DYNAMIC ANALYZER RAD II”測定。通常之畫像顯示裝置或其所用之光學薄膜中所用之感壓接黏劑的貯藏彈性率最高為0.1MPa左右，與其相比，本發明所規定之感壓接黏劑層2的貯藏彈性率為0.15~1MPa之高值。經由使用顯示此類高貯藏彈性率，即硬感壓接黏劑，則可抑制小高溫環境下發生偏光子收縮所伴隨的尺寸變化。即，取得良好的耐久性。In the present invention, the pressure sensitive adhesive disposed on at least one side of the polarizer 1 Layer 2 is composed of a storage modulus of 0.15 to 1 MPa in a temperature range of 23 to 80 °C. The storage elastic modulus can be measured using a commercially available viscoelasticity measuring device, for example, as shown in the examples below, using a viscoelasticity measuring device "DYNAMIC ANALYZER RAD II" manufactured by REOMETRIC. The storage modulus of the pressure sensitive adhesive used in the conventional image display device or the optical film used therein is at most about 0.1 MPa, and the storage modulus of the pressure-sensitive adhesive layer 2 prescribed by the present invention is higher than that. High value of 0.15~1MPa. By using such a high storage modulus, that is, a hard pressure-bonding adhesive, the dimensional change accompanying the occurrence of photon shrinkage in a small high-temperature environment can be suppressed. That is, good durability is obtained.
令感壓接黏劑層2之貯藏彈性率為此類高值的手段並無特別限定，例如，於如上述通常之黏著劑組成物中，配合低聚物，具體而言為胺基甲酸乙酯丙烯酸酯系之低聚物為有效。較佳，配合此類胺基甲酸乙酯丙烯酸酯系低聚物，加上照射能量射線令其硬化者，乃顯示出高貯藏彈性率。配合胺基甲酸乙酯丙烯酸系低聚物之黏著劑組成物，或將其塗佈至支持薄膜上，以紫外線硬化之薄膜狀感壓接黏劑為公知的。The means for making the storage elastic modulus of the pressure-sensitive adhesive layer 2 such a high value is not particularly limited. For example, in the above-mentioned general adhesive composition, an oligomer, specifically, an amino formate B is blended. Ester acrylate-based oligomers are effective. Preferably, such a urethane acrylate-based oligomer is blended with an energy ray to harden it, and exhibits a high storage modulus. It is known to blend an adhesive composition of a urethane acrylate-based oligomer or to apply a film-formed pressure-sensitive adhesive which is cured by ultraviolet rays.
於偏光子1上形成感壓接黏劑層2之方法並無特別限制，例如，於偏光子1之單面或兩面使用如上述之黏著劑組成物形成感壓接黏劑層2後，層合施以聚矽氧系等之脫模處理之樹脂薄膜所構成的間隔件之方法，和如上述於間隔件上形成感壓接黏劑層2之後，於偏光子1上轉印之方法等則可設置。又，於偏光子1上形成感壓接黏劑層時， 視需要於偏光子1或感壓接黏劑層2之貼合側面(單面或兩面)，施以提高密黏性之處理，例如電暈處理等亦可。The method of forming the pressure-sensitive adhesive layer 2 on the polarizer 1 is not particularly limited. For example, after forming the pressure-sensitive adhesive layer 2 on the one or both sides of the polarizer 1 using the above-described adhesive composition, the layer A method of applying a spacer formed of a resin film of a release treatment such as a polysiloxane or the like, and a method of transferring the polarizer 1 after forming the pressure-sensitive adhesive layer 2 on the spacer as described above It can be set. Moreover, when a pressure-sensitive adhesive layer is formed on the polarizer 1, The bonding side (one side or both sides) of the polarizer 1 or the pressure-sensitive adhesive layer 2 may be applied as needed to improve the adhesion, for example, corona treatment.
感壓接黏劑層2之厚度為1~40μm為佳。為了取得本發明目的之薄型偏光板上，在不損害加工性和耐久性等特性之範圍中，期望薄薄形成感壓接黏劑層2，例如，3~25μm，適於保持良好的加工性，並且抑制偏光子的尺寸變化。The thickness of the pressure-sensitive adhesive layer 2 is preferably from 1 to 40 μm. In order to obtain the thin polarizing plate for the purpose of the present invention, it is desirable to form the pressure-sensitive adhesive layer 2 in a thin range without impairing properties such as workability and durability, for example, 3 to 25 μm, which is suitable for maintaining good workability. And suppresses the change in the size of the polarizer.
於偏光子1的單面，設置如上說明之感壓接黏劑層2，並於偏光子1的另一面，設置透明樹脂薄膜所構成的保護層4為佳。保護層4可使用適當的透明薄膜。其中，較佳使用透明性和均勻之光學特性、機械強度、熱安定性等優良之樹脂所構成的薄膜。可列舉例如，三乙醯纖維素和二乙醯纖維素般之纖維素系樹脂薄膜、聚對苯二甲酸乙二酯和聚間苯二酸乙二酯、聚對苯二甲酸丁二酯般之聚酯系樹脂薄膜、聚(甲基)丙烯酸甲酯和聚(甲基)丙烯酸乙酯般之丙烯酸系樹脂薄膜、聚碳酸酯系樹脂薄膜、聚醚碸系樹脂薄膜、聚碸系樹脂薄膜、聚醯亞胺系樹脂薄膜、聚烯烴系樹脂薄膜、原冰片烯般之環狀烯烴作為單體的環狀烯烴系樹脂薄膜等，但並非限定於此。於保護層4與偏光子1的接黏上，可使用接黏劑或感壓接黏劑。It is preferable to provide the pressure-sensitive adhesive layer 2 as described above on one side of the polarizer 1, and to provide the protective layer 4 made of a transparent resin film on the other surface of the polarizer 1. The protective layer 4 can use a suitable transparent film. Among them, a film composed of a resin excellent in transparency, uniform optical characteristics, mechanical strength, thermal stability, and the like is preferably used. For example, a film of a cellulose resin such as triethylene phthalate cellulose and a cellulose phthalate, a polyethylene terephthalate, a polyethylene terephthalate or a polybutylene terephthalate. Polyester-based resin film, poly(methyl) acrylate and poly(meth) acrylate-like acrylic resin film, polycarbonate resin film, polyether oxime resin film, polyfluorene-based resin film The polyimine-based resin film, the polyolefin-based resin film, and the cyclic olefin-like cyclic olefin as a monomeric cyclic olefin-based resin film are not limited thereto. An adhesive or a pressure sensitive adhesive may be used for bonding the protective layer 4 to the polarizer 1.
於保護層4之表面，視需要，亦可設置硬塗層、防止反射層、防眩層等之表面處理層。硬塗層為用以防止偏光板表面刮傷而形成者，主要由紫外線硬化型樹脂，例如，丙烯酸系和聚矽氧系等之樹脂，適當選定與透明保護層4 之密黏性和硬度優良者，並且於透明保護層4之表面形成。On the surface of the protective layer 4, a surface treatment layer such as a hard coat layer, an antireflection layer, an antiglare layer or the like may be provided as needed. The hard coat layer is formed by preventing the surface of the polarizing plate from being scratched, and is mainly selected from the ultraviolet curable resin, for example, a resin such as an acrylic or polyoxygen, and the transparent protective layer 4 is appropriately selected. It is excellent in adhesion and hardness, and is formed on the surface of the transparent protective layer 4.
又，防止反射層為於偏光板之表面防止外光反射之目的下形成，可依公知方法形成。防眩層為於偏光板之表面防止外光進入發生辨識性阻礙所形成者，例如，一般經由噴砂方式和浮雕加工方式等予以粗面化方式、和將紫外線硬化型樹脂中混合透明微粒子之塗佈液予以塗佈且硬化之方式等，於透明保護層4之表面以凹凸構成般形成。Further, the antireflection layer is formed for the purpose of preventing reflection of external light on the surface of the polarizing plate, and can be formed by a known method. The anti-glare layer is formed by preventing the external light from entering the surface of the polarizing plate, and is generally formed by a sandblasting method, a embossing method, or the like, and a method of mixing the transparent particles with the ultraviolet curable resin. The cloth liquid is applied and hardened, and the like, and the surface of the transparent protective layer 4 is formed by irregularities.
如上所構成之本發明的偏光板10為於其感壓接黏劑層2側，配置高分子薄膜作成複合偏光板。圖2為示出本發明之複合偏光板之層構成之一例的剖面模式圖。圖2所示之複合偏光板15為由圖1所示之偏光板10剝離間隔件9之狀態，於其感壓接黏劑層2側配置高分子薄膜6。此例中，高分子薄膜6為以相位差板所構成。於高分子薄膜6之表面，設置感壓接黏劑層7，再於其表面，以間隔件9a予以假黏保護。The polarizing plate 10 of the present invention configured as described above is provided with a polymer film as a composite polarizing plate on the pressure-sensitive adhesive layer 2 side. Fig. 2 is a schematic cross-sectional view showing an example of a layer configuration of a composite polarizing plate of the present invention. The composite polarizing plate 15 shown in Fig. 2 is in a state in which the spacer 9 is peeled off from the polarizing plate 10 shown in Fig. 1, and the polymer film 6 is placed on the pressure-sensitive adhesive layer 2 side. In this example, the polymer film 6 is formed of a phase difference plate. On the surface of the polymer film 6, a pressure-sensitive adhesive layer 7 is provided, and on the surface thereof, a spacer 9a is used for false adhesion protection.
高分子薄膜6可由先前構成保護層2之樹脂所例示的各種樹脂所構成。特別此高分子薄膜6為具有面內相位差，且以具有作為相位差板機能者所構成為佳。具有面內相位差之高分子薄膜6為以相位差板所要求之特性，即，其複折射為光學上均勻者為適於選擇，且可被使用於偏光子1之保護機能及液晶面板之相位差補償(亦包含視野角補償之意義)等目的。其例可不限定使用先前畫像顯示裝置所使用者，可列舉各種透明高分子之延伸薄膜等所構成的 複折射性薄膜、Discotic液晶和向列液晶經配向固定的薄膜、於薄膜基材上形成上述液晶層者。於薄膜基材上固定液晶層時，較佳使用三乙醯纖維素等之纖維素系樹脂薄膜作為支持配向液晶層的薄膜基材。The polymer film 6 can be composed of various resins exemplified by the resin constituting the protective layer 2 previously. In particular, the polymer film 6 preferably has an in-plane retardation and is preferably provided as a phase difference plate function. The polymer film 6 having the in-plane retardation is a characteristic required for the phase difference plate, that is, the birefringence is optically uniform, which is suitable for selection, and can be used for the protection function of the polarizer 1 and the liquid crystal panel. Phase difference compensation (also includes the meaning of viewing angle compensation) and other purposes. For example, the user of the prior art image display device may be used, and various transparent polymer stretch films may be used. The birefringent film, the Discotic liquid crystal, and the nematic liquid crystal are aligned and fixed, and the liquid crystal layer is formed on the film substrate. When the liquid crystal layer is fixed to the film substrate, a cellulose resin film such as triacetyl cellulose is preferably used as the film substrate supporting the alignment liquid crystal layer.
形成複折射性薄膜之高分子可列舉例如，聚碳酸酯系、聚乙烯醇系、聚苯乙烯系、聚甲基丙烯酸甲酯系、聚丙烯般之聚烯烴系、多芳基化合物系、聚醯胺系、原冰片烯般之環狀烯烴作為單體的環狀聚烯烴系等。延伸薄膜亦可以單軸和雙軸等之適當方式處理者。又，亦可使用與熱吸縮性薄膜之接黏下加以收縮力及/或延伸力控制薄膜厚度方向之折射率的複折射性薄膜。Examples of the polymer forming the birefringent film include polycarbonate, polyvinyl alcohol, polystyrene, polymethyl methacrylate, polypropylene, polyolefin, polyarylate, and poly. A cyclic olefin such as a guanamine type or a norbornene-like cyclic olefin is used as a monomer. The stretch film can also be handled in a suitable manner such as uniaxial and biaxial. Further, a birefringent film which is bonded to the heat-shrinkable film and which has a shrinking force and/or an extending force to control the refractive index in the thickness direction of the film may be used.
高分子薄膜6根據實用上之需要自由選擇前述素材所構成的薄膜種類，特別以偏光板之薄型化為目的之本發明中，具有相位差板機能之高分子薄膜6為層合至偏光板10之感壓接黏劑層2側為佳。又，視需要，將偏光子1之感壓接黏劑層2反側設置之保護層4，以具有相位差板機能之樹脂薄膜所構成亦可。In the present invention, the polymer film 6 having a phase difference plate function is laminated to the polarizing plate 10 in the present invention, in which the polymer film 6 is freely selected from the above-mentioned materials, and in particular, in order to reduce the thickness of the polarizing plate. The pressure sensitive adhesive layer 2 side is preferred. Further, if necessary, the protective layer 4 provided on the reverse side of the pressure-sensitive adhesive layer 2 of the polarizer 1 may be formed of a resin film having a phase difference plate function.
特別於作成攜帶型用途之畫像顯示裝置所使用之橢圓偏光或圓偏光型式之複合偏光板時，有效使用λ/2板或λ/4板。橢圓偏光或圓偏光型式之複合偏光板，為分別具有將入射之偏光為直線偏光時變換成橢圓偏光或圓偏光，而在入射之偏光為橢圓偏光或圓偏光時變換成直線偏光的機能。特別將橢圓偏光或圓偏光變換成直線偏光，將直線偏光變換成橢圓偏光或圓偏光的相位差板，係使用被稱為λ /4板，對於入射光之波長顯示1/4波長相位差者。又，λ/2板為具有改變直線偏光方向的機能。更且，將λ/2板與λ/4板，以光學軸為以指定角度交叉般層合，作成於廣波長領域顯示出1/4波長之相位差的廣帶域λ/4板亦可。In particular, when a composite polarizing plate of an elliptically polarized or circularly polarized type used for an image display device for portable use is used, a λ/2 plate or a λ/4 plate is effectively used. The elliptically polarized or circularly polarized composite polarizing plate has a function of converting into elliptically polarized light or circularly polarized light when the incident polarized light is linearly polarized, and converting into linear polarized light when the incident polarized light is elliptically polarized or circularly polarized. In particular, a elliptically polarized or circularly polarized light is converted into a linearly polarized light, and a linearly polarized light is converted into an elliptically polarized or circularly polarized phase difference plate, which is called λ. /4 board, showing the 1/4 wavelength phase difference for the wavelength of incident light. Further, the λ/2 plate has a function of changing the direction of the linear polarization. Further, the λ/2 plate and the λ/4 plate are laminated such that the optical axis is intersected at a predetermined angle, and the wide band λ/4 plate which exhibits a phase difference of 1/4 wavelength in the wide wavelength region can also be used. .
上述之橢圓偏光型式之複合偏光板，有效防止液晶顯示裝置中經由液晶之複折射所產生的著色現象，圓偏光型式之複合偏光板為於反射型或半穿透反射型畫像顯示裝置中，有效使用於提高亮度之目的等。圓偏光型式之複合偏光板，亦具有防止反射之機能。The above-mentioned elliptically polarized type composite polarizing plate is effective for preventing coloring phenomenon caused by birefringence of liquid crystal in a liquid crystal display device, and the circular polarized type composite polarizing plate is effective for a reflective or transflective image display device. Used for the purpose of improving brightness, etc. The circular polarizing type composite polarizing plate also has a function of preventing reflection.
於本發明之複合偏光板15中，於貼合至貯藏彈性率高之感壓接黏劑層2的高分子薄膜6的外側，為了層合至畫像顯示裝置，或為了層合至其他光學層，以設置感壓接黏劑層7為佳。更且，於此感壓接黏劑層7的露出面，具有施以聚矽氧系等之脫模劑處理之樹脂薄膜所構成的間隔件9a為佳。In the composite polarizing plate 15 of the present invention, it is bonded to the outside of the polymer film 6 of the pressure-sensitive adhesive layer 2 having a high storage modulus, for lamination to an image display device, or for lamination to other optical layers. It is preferable to provide the pressure-sensitive adhesive layer 7. Further, it is preferable that the exposed surface of the pressure-sensitive adhesive layer 7 has a spacer 9a made of a resin film treated with a release agent such as polyoxymethylene.
於高分子薄膜6之外側設置的感壓接黏劑層7，可為先前畫像顯示裝置或其光學薄膜所使用的一般物質，於本發明中並不需要如設置於偏光子1之至少單面之感壓接黏劑層2之貯藏彈性率。其例為使用丙烯酸系聚合物、和聚矽氧系聚合物、聚酯、聚胺基甲酸乙酯等作為基質聚合物。其中，如丙烯酸系感壓接黏劑般，選擇使用光學透明性優良，保持適度之濕潤性和凝集力，與基材之接黏性亦優良，更且具有耐候性和耐熱性等，於加熱和加濕之條件下不會產生浮起和剝落等剝離問題者為佳。The pressure-sensitive adhesive layer 7 provided on the outer side of the polymer film 6 may be a general substance used in the prior art image display device or its optical film, and is not required to be disposed on at least one side of the polarizer 1 in the present invention. The storage modulus of the pressure-sensitive adhesive layer 2 is. Examples thereof include an acrylic polymer, a polyoxymethylene polymer, a polyester, a polyurethane, and the like as a matrix polymer. Among them, in the case of an acrylic pressure-sensitive adhesive, it is excellent in optical transparency, maintains moderate wettability and cohesive force, and has excellent adhesion to a substrate, and has weather resistance and heat resistance. It is better not to cause peeling problems such as floating and peeling under the conditions of humidification.
感壓接黏劑層7為視需要，亦可含有用以賦予光散亂性的微粒子，亦可配合玻璃纖維和玻璃珠粒、樹脂珠粒、金屬粉和其他之無機粉末等所構成的充填劑、顏料和著色劑、抗氧化劑、紫外線吸收劑等。紫外線吸收劑為水楊酸酯系化合物和二苯酮系化合物、苯并三唑系化合物、氰基丙烯酸酯系化合物、鎳錯鹽系化合物等。The pressure-sensitive adhesive layer 7 may contain microparticles for imparting light scattering, or may be filled with glass fibers and glass beads, resin beads, metal powder and other inorganic powders, as needed. Agents, pigments and colorants, antioxidants, UV absorbers, and the like. The ultraviolet absorber is a salicylate-based compound, a benzophenone-based compound, a benzotriazole-based compound, a cyanoacrylate-based compound, or a nickel-salted salt-based compound.
感壓接黏劑層7之形成，例如，於甲苯和醋酸乙酯等之有機溶劑中將黏著劑組成物溶解或分散調製10~40重量%之溶液，並將其直接塗佈至高分子薄膜6表面之方式，和預先施以聚矽氧系等之脫模處理的間隔件上形成感壓接黏劑層，並將其移黏至高分子薄膜6上的方式等則可進行。感壓接黏劑層7的厚度為根據其接黏力等而決定，通常為1~50μm之範圍。Forming the pressure-sensitive adhesive layer 7, for example, dissolving or dispersing the adhesive composition in an organic solvent such as toluene or ethyl acetate to prepare a solution of 10 to 40% by weight, and directly coating the polymer film 6 The surface may be formed by forming a pressure-sensitive adhesive layer on a separator which has been subjected to a release treatment such as polyfluorination or the like, and moving the pressure-sensitive adhesive layer to the polymer film 6. The thickness of the pressure-sensitive adhesive layer 7 is determined according to the adhesive strength or the like, and is usually in the range of 1 to 50 μm.
將設置貯藏彈性率高之感壓接黏劑層2的偏光子1與高分子薄膜6層合的方法並無特別限定，若根據先前已知之技術予以層合即可。The method of laminating the polarizer 1 of the pressure-sensitive adhesive layer 2 having a high storage modulus and the polymer film 6 is not particularly limited, and may be laminated according to a technique known in the prior art.
其例可列舉使用貼合輥等，令高分子薄膜6之光學軸為相對於偏光子之偏光軸以垂直或平行般層合的方法，和高分子薄膜6之光學軸相對於偏光子之偏光軸為以指定角度層合的方法。特別本發明之複合偏光板，有效使用於偏光子1之偏光軸與高分子薄膜6之光學軸為以指定角度層合之圓偏光或橢圓偏光型式的形成。For example, a bonding roll or the like is used, and the optical axis of the polymer film 6 is laminated vertically or in parallel with respect to the polarization axis of the polarizer, and the optical axis of the polymer film 6 is polarized with respect to the polarizer. The axis is a method of lamination at a specified angle. In particular, the composite polarizing plate of the present invention is effectively used in the formation of a circularly polarized or elliptically polarized pattern in which the optical axis of the polarizer 1 and the optical axis of the polymer film 6 are laminated at a predetermined angle.
又，根據本發明之偏光板或複合偏光板，於使用時可將顯示其他光學機能的光學層以1層或2層以上層合。 關於此光學層並無特別限定，可列舉例如，反射層、半穿透反射層、光擴散層、相位差板、集光板、提高亮度之薄膜等。Further, according to the polarizing plate or the composite polarizing plate of the present invention, an optical layer exhibiting other optical functions can be laminated in one layer or two or more layers at the time of use. The optical layer is not particularly limited, and examples thereof include a reflective layer, a semi-transmissive reflective layer, a light-diffusing layer, a retardation plate, a light-concentrating plate, and a film for improving brightness.
反射型之複合偏光板，被使用於令來自辨識側的入射光反射且顯示類型的液晶顯示裝置，因為可省略背光等之光源，故易於液晶顯示裝置薄型化。又，半穿透反射型之複合偏光板，於亮處為以反射型型式，於暗處為以利用背光等光源之穿透型式顯示類型之液晶顯示裝置中使用。作為反射型之複合偏光板的反射層，例如，於偏光子1上的保護層4附設鋁等之金屬所構成的箔和澱積膜則可形成。又，作為半穿透反射型之複合偏光板用的半穿透反射層，可經由將前述之反射層作為半鏡片之方法，和將含有珍珠顏料等之顯示光穿透性的反射板接黏至偏光板的方法等則可形成。The reflective composite polarizing plate is used for a liquid crystal display device that reflects incident light from the identification side and is of a display type. Since the light source such as a backlight can be omitted, the liquid crystal display device can be made thinner. Further, the transflective type composite polarizing plate is used in a reflective type in a bright place and a liquid crystal display device in a transmissive type display type using a light source such as a backlight in a dark place. As the reflective layer of the reflective composite polarizing plate, for example, a foil composed of a metal such as aluminum attached to the protective layer 4 on the polarizer 1 and a deposited film can be formed. Further, the semi-transmissive reflective layer for a transflective composite polarizing plate can be adhered to a reflecting plate containing a pearl pigment or the like by a method of using the reflective layer as a half-lens. A method to the polarizing plate or the like can be formed.
另一方面，擴散型的複合偏光板為兼併具備令入射的光擴散的機能，例如，使用於偏光子1上之保護層4上進行消光處理之方法、塗佈含有微粒子之樹脂的方法、接黏含有微粒子之薄膜的方法等各種方法，於表面形成微細凹凸構造的光擴散層。On the other hand, the diffused composite polarizing plate has a function of diffusing incident light, for example, a method of performing a matting treatment on the protective layer 4 on the polarizer 1, a method of applying a resin containing fine particles, and a method of bonding Various methods such as a method of adhering a film containing fine particles form a light diffusion layer having a fine uneven structure on the surface.
更且，反射擴散兩用之複合偏光板為例如於擴散型複合偏光板之微細凹凸構造面，經由設置反映其凹凸構造之反射層的方法，設置擴散反射層。微細凹凸構造之反射層為令入射光經由亂反射而擴散，防止指向性和閃爍，具有抑制明暗不勻的優點等。又，含有微粒子之樹脂層和薄膜 ，在入射光及其反射光穿透此層時被擴散，具有更加抑制明暗不均等之優點。反映表面微細凹凸構造之反射層為例如根據真空澱積、離子電鍍、濺鍍等之澱積、和鍍敷等之方法，於微細凹凸構造之表面直接附設金屬則可形成。另外，用以形成表面微細凹凸構造所配合的微粒子，可利用例如平均粒徑為0.1~30μm之二氧化矽、氧化鋁、氧化鈦、氧化鋯、氧化錫、氧化銦、氧化鎘、氧化銻等所構成的無機系微粒子、交聯或未交聯之聚合物等所構成的有機系微粒子等。Further, the composite polarizing plate for reflection and diffusion is, for example, a fine uneven structure surface of a diffusion type composite polarizing plate, and a diffuse reflection layer is provided by a method of providing a reflective layer reflecting the uneven structure. The reflective layer of the fine concavo-convex structure diffuses the incident light by disorderly reflection, prevents directivity and flicker, and has the advantage of suppressing unevenness of light and dark. Further, a resin layer and a film containing fine particles When the incident light and its reflected light penetrate through the layer, it is diffused, which has the advantage of suppressing uneven brightness and the like. The reflective layer reflecting the fine concavo-convex structure of the surface can be formed by, for example, depositing directly on the surface of the fine concavo-convex structure by a method such as deposition by vacuum deposition, ion plating, sputtering, or the like, and plating. Further, for the fine particles to be formed by the surface fine uneven structure, for example, cerium oxide, aluminum oxide, titanium oxide, zirconium oxide, tin oxide, indium oxide, cadmium oxide, cerium oxide, or the like having an average particle diameter of 0.1 to 30 μm can be used. Organic fine particles composed of inorganic fine particles, crosslinked or uncrosslinked polymers, and the like.
相位差板之例可列舉與具有相位差之高分子薄膜6中說明者相同者。Examples of the phase difference plate are the same as those described in the polymer film 6 having a phase difference.
集光板為在控制光路等之目的中附設，可作成稜鏡陣列片和透鏡陣列片、或附設點之薄片等型式則可形成。The light collecting plate may be formed by attaching a pattern such as a 稜鏡 array sheet and a lens array sheet, or a sheet attached to a dot for the purpose of controlling an optical path or the like.
提高亮度之薄膜為令一部分入射的自然光以直線偏光或圓偏光型式穿透，並將剩餘反射具有再利用之機能，被使用於提高液晶顯示裝置等之亮度目的。其例可列舉將折射率之異向性彼此不同的薄膜層合數枚設計成反射率上產生異向性的反射型直線偏光分離薄片，將膽固性液晶聚合物之配向薄膜和其配向液晶層於薄膜基材上支持的反射型圓偏光分離薄片等。The film for increasing the brightness is used for improving the brightness of a liquid crystal display device or the like by allowing a part of the incident natural light to penetrate in a linearly polarized or circularly polarized pattern and reusing the remaining reflection. Examples thereof include a plurality of thin film laminates having different refractive index anisotropy, and a reflective linear polarized separation sheet having an anisotropy in reflectance, and an alignment film of a cholester liquid crystal polymer and a alignment liquid crystal thereof. A reflective circularly polarizing separation sheet or the like supported on a film substrate.
如上述之各種光學層為使用黏著劑或接黏劑與偏光板或複合偏光板一體化，但如此所用之黏著劑或接黏劑並無特別限定，若選擇適當物質即可。由接黏作業之簡便性和防止光學歪斜發生等之觀點而言，以使用感壓接黏劑為佳 。感壓接黏劑之例可列舉參照先前圖2關於感壓接黏劑層7所說明者同樣者。又，所形成之感壓接黏劑層為於表面露出之情形中，為了防止污染等，可配置間隔件。間隔件可使用先前說明者同樣者。The optical layers as described above are integrated with a polarizing plate or a composite polarizing plate using an adhesive or an adhesive. However, the adhesive or adhesive used in the above is not particularly limited, and an appropriate substance may be selected. It is better to use a pressure sensitive adhesive from the viewpoints of the ease of bonding work and prevention of optical skewing. . Examples of the pressure-sensitive adhesive may be the same as those described above with respect to the pressure-sensitive adhesive layer 7 of Fig. 2 . Further, in the case where the pressure-sensitive adhesive layer is formed to be exposed on the surface, a spacer may be disposed in order to prevent contamination or the like. The spacers can be the same as previously described.
本發明之偏光板或複合偏光板為配置於各種畫像顯示元件，作成畫像顯示裝置。例如，於液晶胞之單面或兩面配置可作成液晶顯示裝置。所使用之液晶胞為任意的，例如，薄膜電晶體型所代表之主動矩陣驅動型之物質，超扭轉向列型所代表之單純矩陣驅動型之物質等，使用各種液晶面板可形成液晶顯示裝置。於液晶胞之兩側設置本發明之複合板或複合偏光板時，兩者可為相同，或者相異亦可。The polarizing plate or the composite polarizing plate of the present invention is disposed on various image display elements to form an image display device. For example, a liquid crystal display device can be formed on one side or both sides of the liquid crystal cell. The liquid crystal cell to be used is arbitrary, for example, an active matrix driving type material represented by a thin film transistor type, a simple matrix driving type substance represented by a super twisted nematic type, etc., and a liquid crystal display device can be formed using various liquid crystal panels. . When the composite panel or the composite polarizing plate of the present invention is disposed on both sides of the liquid crystal cell, the two may be the same or different.
圖3為示出將本發明之複合偏光板裝配至液晶面板例之剖面模式圖。Fig. 3 is a schematic cross-sectional view showing an example in which a composite polarizing plate of the present invention is assembled to a liquid crystal panel.
此例中，由圖2所示之複合偏光板15剝離間隔件9a之狀態者，透過此感壓接黏劑層7貼黏至液晶胞20的單面(圖中之上側)，並於液晶胞20之另一面(圖的下側)，以感壓接黏劑層7/高分子薄膜(相位差板)6/貯藏彈性率高之感壓接黏劑層2/偏光子1/透明保護層4之順序層合(此狀態下，相當於圖2所示之複合偏光板15)，再於其外側層合其他光學層8的複合偏光板16，以其感壓接黏劑層7側貼黏。此例之液晶顯示裝置為以圖上側為辨識側，設置背光時，配置於圖的下側。此時，其他之光學層8可為反射層、半穿透反射層、集光板、提高亮度之薄膜等 。In this example, the state in which the spacer 9a is peeled off by the composite polarizing plate 15 shown in FIG. 2 is adhered to one side (upper side in the drawing) of the liquid crystal cell 20 through the pressure-sensitive adhesive layer 7, and is in the liquid crystal. The other side of the cell 20 (the lower side of the figure), with the pressure-sensitive adhesive layer 7 / polymer film (phase difference plate) 6 / pressure sensitive adhesive layer 2 / polarizer 1 / transparent protection The layers 4 are laminated in this order (in this state, corresponding to the composite polarizing plate 15 shown in FIG. 2), and the composite polarizing plate 16 of the other optical layers 8 is laminated on the outer side thereof, with the pressure-sensitive adhesive layer 7 side Sticky. In the liquid crystal display device of this example, the upper side of the figure is the identification side, and when the backlight is provided, it is disposed on the lower side of the figure. At this time, the other optical layer 8 may be a reflective layer, a semi-transmissive reflective layer, a light collecting plate, a film for improving brightness, and the like. .
更且，本發明之複合偏光板為於液晶顯示裝置以外之畫像顯示裝置，例如有機EL顯示裝置等之平面顯示器中，具有防止反射機能之圓偏光或橢圓偏光型式中亦可有效使用。當然，應用本發明之偏光板或複合偏光板的畫像顯示裝置並不應僅被限定於此處例示者。Further, the composite polarizing plate of the present invention is an image display device other than the liquid crystal display device, and a flat display such as an organic EL display device can be effectively used in a circularly polarized or elliptically polarized pattern having a reflection preventing function. Of course, the image display device to which the polarizing plate or the composite polarizing plate of the present invention is applied should not be limited only to those exemplified herein.
以下，示出實施例及比較例進一步具體說明本發明，但本發明不被此等例所限定。另外，於下例中，貯藏彈性率及尺寸變化率為根據下列方法所測定之值。Hereinafter, the present invention will be specifically described by way of examples and comparative examples, but the present invention is not limited by these examples. Further, in the following examples, the storage modulus and the dimensional change rate are values measured according to the following methods.
感壓接黏劑之貯藏彈性率(G’)為以8mm×1mm厚之圓柱作為試驗片，使用REOMETRIC公司製之測定器“DYNAMIC ANALYZER RDA II”，以周波數1Hz之扭轉切斷法求出。The storage modulus (G') of the pressure sensitive adhesive is 8mm A cylinder having a thickness of 1 mm was used as a test piece, and was obtained by a torsion cutting method using a measuring instrument "DYNAMIC ANALYZER RDA II" manufactured by REOMETRIC Co., Ltd. at a frequency of 1 Hz.
將各例製作之偏光板，以偏光吸收軸相對於長邊以順時鐘120度般切出對角2.7吋(約6.9公分)大小，並將其感壓接黏劑層側貼附至厚度0.7mm之玻璃板，以溫度50℃、壓力0.5MPa之條件進行20分鐘壓熱鍋處理。自然冷卻後，將各樣品投入溫度保持於85℃的烤爐中，保持 500小時進行加熱試驗。使用(股)Nikon製之二次元測定器“NEXIV VMR-12072”，測定試驗前後之偏光板的尺寸，並且根據下式算出尺寸變化率。另外，尺寸測定為分別對於偏光板之長邊及短邊進行，分別求出長邊的尺寸變化率及短邊的尺寸變化率，並以其平均值視為複合偏光板全體的尺寸變化率。尺寸變化率(%)=[(試驗前之尺寸-試驗後之尺寸)/試驗前之尺寸]×100The polarizing plate prepared in each example was cut to a diagonal of 2.7 吋 (about 6.9 cm) with a polarization absorption axis of 120 degrees with respect to the long side, and the pressure-sensitive adhesive layer side was attached to the thickness of 0.7. The glass plate of mm was subjected to a autoclave treatment at a temperature of 50 ° C and a pressure of 0.5 MPa for 20 minutes. After natural cooling, each sample was placed in an oven maintained at 85 ° C to maintain The heating test was carried out for 500 hours. The size of the polarizing plate before and after the test was measured using a secondary element measuring device "NEXIV VMR-12072" manufactured by Nikon, and the dimensional change rate was calculated according to the following formula. Further, the dimensions were measured for the long side and the short side of the polarizing plate, and the dimensional change rate of the long side and the dimensional change rate of the short side were respectively determined, and the average value of the composite polarizing plate was regarded as the dimensional change rate. Dimensional change rate (%) = [(size before test - size after test) / size before test] × 100
又，於下列例中，於偏光子表面直接設置之感壓接黏劑為使用下列物質。Further, in the following examples, the pressure sensitive adhesive directly disposed on the surface of the polarizer was the following.
感壓接黏劑A：於丙烯酸丁酯與丙烯酸之共聚物中配合胺基甲酸乙酯丙烯酸酯低聚物，再添加異氰酸酯系交聯劑之有機溶劑溶液，對施以脫模處理之厚度38μm的聚對苯二甲酸乙二酯薄膜(間隔件)的脫模處理面，以型塗器塗佈成乾燥後之厚度為15μm的薄片狀黏著劑。Pressure-sensitive adhesive A: a copolymer of butyl acrylate and acrylic acid is blended with an urethane acrylate oligomer, and an organic solvent solution of an isocyanate-based crosslinking agent is added, and the thickness of the mold release treatment is 38 μm. The release-treated surface of the polyethylene terephthalate film (spacer) was applied by a coater to a dried sheet-like adhesive having a thickness of 15 μm.
感壓接黏劑層之貯藏彈性率於23℃中為0.40MPa，於80℃中為0.18MPa。The storage modulus of the pressure-sensitive adhesive layer was 0.40 MPa at 23 ° C and 0.18 MPa at 80 ° C.
感壓接黏劑B：對施以脫模處理之厚度38μm的聚對苯二甲酸乙二酯薄膜(間隔件)的脫模處理面，設置厚度15μm之丙烯酸系感壓接黏劑層的市售薄片狀黏著劑。未配合胺基甲酸乙酯丙烯酸酯低聚物。此感壓接黏劑層之貯藏彈性率於23℃中為0.05MPa，於80℃中為0.04MPa。Pressure-sensitive adhesive B: A commercially available pressure-sensitive adhesive layer having a thickness of 15 μm for a release-treated surface of a polyethylene terephthalate film (spacer) having a thickness of 38 μm subjected to release treatment A flaky adhesive is sold. Not blended with urethane acrylate oligomer. The storage modulus of the pressure-sensitive adhesive layer was 0.05 MPa at 23 ° C and 0.04 MPa at 80 ° C.
感壓接黏劑C：對施以脫模處理之厚度38μm的聚對苯二甲酸乙二酯薄膜(間隔件)的脫模處理面，設置厚度 15μm之丙烯酸系感壓接黏劑層的市售薄片狀黏著劑。未配合胺基甲酸乙酯丙烯酸酯低聚物。此感壓接黏劑層之貯藏彈性率於23℃中為0.10MPa，於80℃中為0.04MPa。Pressure-sensitive adhesive C: a release-treated surface of a polyethylene terephthalate film (spacer) having a thickness of 38 μm subjected to release treatment, and a thickness A commercially available flaky adhesive of a 15 μm acrylic pressure-sensitive adhesive layer. Not blended with urethane acrylate oligomer. The storage modulus of the pressure-sensitive adhesive layer was 0.10 MPa at 23 ° C and 0.04 MPa at 80 ° C.
準備於聚乙烯醇吸黏配向碘之厚度25μm的薄膜所構成之偏光子的單面，將厚度40μm之三乙醯纖維素薄膜所構成的保護膜，透過含有聚乙烯醇與水溶性環氧樹脂之水溶液所構成的接黏劑貼合的偏光板。於此聚乙烯醇薄膜側，貼黏感壓接黏劑A，取得對應圖1的薄型偏光板。Prepared on a single side of a polarizer composed of a film of a polyvinyl alcohol adsorbing and aligning iodine with a thickness of 25 μm, and a protective film made of a 40 μm thick triacetyl cellulose film, containing a polyvinyl alcohol and a water-soluble epoxy resin. A polarizing plate in which an adhesive is bonded to the aqueous solution. On the side of the polyvinyl alcohol film, a pressure sensitive adhesive A was adhered to obtain a thin polarizing plate corresponding to FIG.
另外，準備於厚度為40μm且面內相位差為140nm之原冰片烯系樹脂所構成的相位差薄膜[積水化學(股)製之“S Cina Film”：商品名]之單面設置厚度25μm之丙烯酸感壓接黏劑，且其表面為經間隔件所覆蓋之附有感壓接黏劑的相位差板。將先前所得之薄型偏光板的間隔件剝離後，於其感壓接黏劑層側，將上述之附有感壓接黏劑之相位差板以未設置丙烯酸系感壓接黏劑側，令其光學軸相對於偏光板之偏光吸收軸以順時鐘45°般貼合，製作對應圖2的薄型複合偏光板。所得之薄型複合偏光板的總厚除去最表面之間隔件為148μm，每單位面積之重量為17.55mg/cm2 。In addition, a retardation film composed of a raw borneol-based resin having a thickness of 40 μm and an in-plane retardation of 140 nm (S Cina Film: manufactured by Sekisui Chemical Co., Ltd.: trade name) is provided with a thickness of 25 μm on one side. Acrylic pressure sensitive adhesive, and its surface is a phase difference plate with a pressure sensitive adhesive covered by a spacer. After peeling off the spacer of the previously obtained thin polarizing plate, on the side of the pressure-sensitive adhesive layer, the phase difference plate with the pressure-sensitive adhesive attached thereto is pressure-bonded to the adhesive side without an acrylic pressure. The optical axis of the polarizing plate was bonded to the polarizing absorption axis of the polarizing plate at a clockwise angle of 45° to produce a thin composite polarizing plate corresponding to FIG. 2 . The total thickness of the obtained thin composite polarizing plate was 148 μm excluding the outermost surface and the weight per unit area was 17.55 mg/cm 2 .
準備於實施例1所用之相同聚乙烯醇薄膜所構成之偏 光子的兩面，分別將厚度40μm之三乙醯纖維素薄膜所構成之保護膜，透過含有聚乙烯醇與水溶性環氧樹脂之水溶液所構成的接黏劑貼合的偏光板。於其單面，貼合感壓接黏劑B後，剝離感壓接黏劑B的間隔件，並於其感壓接黏劑層側，將實施例1所用相同之附有感壓接黏劑的相位差板以未設置丙烯酸系感壓接黏劑側貼合，製造對應圖4之複合偏光板。此複合偏光板之構成為通常市售之先前複合偏光板的代表例。所得複合偏光板的總厚除去最表面之間隔件為188μm，每單位面積之重量為21.18mg/cm2 。A protective film comprising a 40 μm thick triacetyl cellulose film was passed through both sides of the polarizer composed of the same polyvinyl alcohol film used in Example 1, and passed through an aqueous solution containing polyvinyl alcohol and a water-soluble epoxy resin. A polarizing plate to which the adhesive is bonded. After bonding the pressure-sensitive adhesive B on one side thereof, the spacer of the pressure-sensitive adhesive B is peeled off, and on the side of the pressure-sensitive adhesive layer, the same pressure-sensitive adhesive used in the embodiment 1 is adhered. The phase difference plate of the agent was bonded to the side where the acrylic pressure sensitive adhesive was not provided, and the composite polarizing plate corresponding to FIG. 4 was produced. The composite polarizing plate is a representative example of a conventional composite polarizing plate which is usually commercially available. The total thickness of the obtained composite polarizing plate was 188 μm excluding the outermost surface, and the weight per unit area was 21.18 mg/cm 2 .
於實施例1中，除了將偏光子與相位差板之間配置的感壓接黏劑變更成感壓接黏劑B以外，同實施例1處理製作薄型複合偏光板。In the first embodiment, a thin composite polarizing plate was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive disposed between the polarizer and the retardation film was changed to the pressure-sensitive adhesive B.
於實施例1中，除了將偏光子與相位差板之間配置的感壓接黏劑變更成感壓接黏劑C以外，同實施例1處理製作薄型複合偏光板。In the first embodiment, a thin composite polarizing plate was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive disposed between the polarizer and the retardation plate was changed to the pressure-sensitive adhesive C.
其次，對於實施例1及比較例1~3所製作之複合偏光板，根據前述之試驗方法測定尺寸變化率。將其結果，與各複合偏光板之總厚、每單位面積之重量、及偏光子上所設置之感壓接黏劑層的貯藏彈性率合併示於表1。Next, with respect to the composite polarizing plates produced in Example 1 and Comparative Examples 1 to 3, the dimensional change ratio was measured in accordance with the aforementioned test method. The results are shown in Table 1 together with the total thickness of each composite polarizing plate, the weight per unit area, and the storage modulus of the pressure-sensitive adhesive layer provided on the polarizer.
如表1所知，實施例1所得之本發明的薄型複合偏光板，相比於先前複合偏光板例之比較例1，經由將具有相位差之高分子薄膜(相位差板)以保護層型式層合，則可減少複合偏光板的構成枚數，且薄型輕量化。又，於85℃之高溫條件下放置時的尺寸變化率，於除了感壓接黏劑層不同以外採用與實施例1同樣構成之比較例2及3的薄型複合偏光板中，為2.0%以上，於先前的複合偏光板(比較例1)為1.9%，相對地，實施例1的複合偏光板為1.5%，確認可有效抑制偏光子的尺寸變化。因此，本發明之偏光板及複合偏光板可維持良好的耐久性。As is known from Table 1, the thin composite polarizing plate of the present invention obtained in Example 1 has a protective layer type by using a polymer film (phase difference plate) having a phase difference as compared with Comparative Example 1 of the prior composite polarizing plate. When laminated, the number of constituent layers of the composite polarizing plate can be reduced, and the thickness can be reduced. In addition, in the thin composite polarizing plates of Comparative Examples 2 and 3 which were the same as those of the first embodiment, the dimensional change ratio when placed at a high temperature of 85 ° C was 2.0% or more in addition to the pressure-sensitive adhesive layer. In the conventional composite polarizing plate (Comparative Example 1), it was 1.9%, and in contrast, the composite polarizing plate of Example 1 was 1.5%, and it was confirmed that the dimensional change of the polarizer can be effectively suppressed. Therefore, the polarizing plate and the composite polarizing plate of the present invention can maintain good durability.
1‧‧‧偏光子1‧‧‧ polarized photons
2‧‧‧感壓接黏劑層(貯藏彈性率高)2‧‧‧ Pressure-sensitive adhesive layer (high storage modulus)
3‧‧‧感壓接黏劑層(先前)3‧‧‧ Pressure-sensitive adhesive layer (previous)
4、5‧‧‧透明保護層4, 5‧‧‧ transparent protective layer
6‧‧‧高分子薄膜(相位差板)6‧‧‧ polymer film (phase difference plate)
7‧‧‧感壓接黏劑層7‧‧‧ Pressure-sensitive adhesive layer
8‧‧‧其他之光學層8‧‧‧Other optical layers
9、9a‧‧‧間隔件9, 9a‧‧‧ spacers
10‧‧‧偏光板10‧‧‧Polar plate
11‧‧‧偏光板(先前)11‧‧‧Polar plate (previous)
15、16‧‧‧複合偏光板15, 16‧‧‧Composite polarizer
17‧‧‧複合偏光板(先前)17‧‧‧Composite polarizer (previous)
20‧‧‧液晶胞20‧‧‧Liquid cell
圖1為示出本發明之偏光板之層構成一例的剖面模式圖。Fig. 1 is a schematic cross-sectional view showing an example of a layer configuration of a polarizing plate of the present invention.
圖2為示出本發明之複合偏光板之層構成一例的剖面模式圖。Fig. 2 is a schematic cross-sectional view showing an example of a layer configuration of a composite polarizing plate of the present invention.
圖3為示出本發明之複合偏光板裝配至液晶面板例的剖面模式圖。Fig. 3 is a schematic cross-sectional view showing an example in which a composite polarizing plate of the present invention is assembled to a liquid crystal panel.
圖4為示出先前之偏光板及於此層合相位差板之複合偏光板之一般例的剖面模式圖。4 is a schematic cross-sectional view showing a general example of a conventional polarizing plate and a composite polarizing plate of the laminated phase difference plate.
1‧‧‧偏光子1‧‧‧ polarized photons
2‧‧‧感壓接黏劑層(貯藏彈性率高)2‧‧‧ Pressure-sensitive adhesive layer (high storage modulus)
4‧‧‧透明保護層4‧‧‧Transparent protective layer
6‧‧‧高分子薄膜(相位差板)6‧‧‧ polymer film (phase difference plate)
7‧‧‧感壓接黏劑層7‧‧‧ Pressure-sensitive adhesive layer
8‧‧‧其他之光學層8‧‧‧Other optical layers
10‧‧‧偏光板10‧‧‧Polar plate
15、16‧‧‧複合偏光板15, 16‧‧‧Composite polarizer
20‧‧‧液晶胞20‧‧‧Liquid cell
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| JP2007031659A JP5082480B2 (en) | 2007-02-13 | 2007-02-13 | Thin polarizing plate and image display device using the same |
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| JP (1) | JP5082480B2 (en) |
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| Publication number | Publication date |
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| KR101505194B1 (en) | 2015-03-24 |
| JP2008197309A (en) | 2008-08-28 |
| CN101246233A (en) | 2008-08-20 |
| KR20080075779A (en) | 2008-08-19 |
| JP5082480B2 (en) | 2012-11-28 |
| TW200900757A (en) | 2009-01-01 |
| CN105487158A (en) | 2016-04-13 |
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