Polarizing plate and laminated optical member
A technology of optical components and polarizers, which is applied in the direction of polarizing elements, optical elements, optics, etc., can solve the problem that the adhesive layer cannot show hardness, etc., and achieves low possibility of cracking, low possibility of cracking, high storage capacity The effect of the modulus
Active Publication Date: 2019-01-18
SUMITOMO CHEM CO LTD +1
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Problems solved by technology
[0015] The inventors of the present invention found that if the viscosity of the adhesive before curing was lowered, the adhesive layer after curing could not exhibit sufficient hardness when laminating the polarizer and the protective film using an epoxy-based photocurable adhesive. In order to improve this problem, intensive research was carried out, and as a result, the present invention has been accomplished
Method used
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Experimental program
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Effect test
Embodiment 1 and 2 and comparative example 1-9
[0135] (1) Preparation of photocurable adhesive composition
[0136] According to the ratio shown in Table 1, the photocationic curable components and the photocationic polymerization initiator were mixed, and then defoamed to prepare a photocurable adhesive solution. It should be noted that the photocationic polymerization initiator (b1) is compounded in the form of a 50% propylene carbonate solution, and Table 1 expresses it by its solid content.
[0137] (2) Determination of the chlorine concentration of the adhesive before curing
[0138] The chlorine concentration contained in each binder liquid prepared above was measured as follows. That is, first, each binder liquid is decomposed in a combustion device "TOX-100" [manufactured by Dia Instruments], the gas is trapped in an absorption liquid, and then the ion chromatography device "ICS-2000" (Dionex) is used to determine The chlorine concentration was calculated from the amount of chlorine output and the amount of binde...
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Abstract
The invention relates to a polarizing plate and a laminated optical member. There is provided a polarizing plate in which a protection film is stuck to a polyvinyl alcohol-based polarizer through an adhesive. The adhesive is formed by a photocurable adhesive composition containing, based on 100 weight parts of a photocationic curable component (A), 1 to 10 weight parts of a photocationic polymerization initiator (B), and the cured product of the photocurable adhesive composition shows a storage elastic modulus of 1000 MPa or more at 80 DEG C. The photocationic curable component (A) is preparedto contain the following (A1) and (A2); (A1) 50 to 95 wt.% of an alicyclic epoxy compound having an epoxy group bonding to an alicyclic ring and (A2) 5 to 50 wt.% of a diglycidyl compound which has achlorine content of 1 wt.% or less and is represented by the following formula (I) (where Z is an alkylene group, or the like).
Description
technical field [0001] This application is a divisional application of a national phase PCT application with the application number 201280015748.8 (the international filing date is March 23, 2012) and the title of the invention is "Polarizer and Laminated Optical Component". [0002] The present invention relates to a polarizing plate obtained by bonding a protective film to one or both surfaces of a polarizer using a specific photocurable adhesive. The present invention also relates to a laminated optical member obtained by laminating other optical layers such as a retardation film on the polarizing plate. Background technique [0003] A polarizing plate can be used as one of optical components constituting a liquid crystal display device. Generally, a polarizing plate is used by being assembled in a liquid crystal display device in a state where a protective film is laminated on both surfaces of a polarizer. It is also known that a protective film is provided only on one...
Claims
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IPC IPC(8): G02B5/30G02F1/1335C09J163/00C08G59/22
CPCC09J11/06C09J163/00G02F1/133528G02B5/30G02B5/3025G02F2201/50G02F2202/28C08G59/22G02F1/1335
Inventor 久米悅夫竹内智康高桥利行本间英里
Owner SUMITOMO CHEM CO LTD