Optical film having adhesive agent, and optical laminate
An optical film, adhesive layer technology, applied in the direction of adhesive type, ester copolymer adhesive, film/sheet adhesive, etc., can solve the problem of insufficient durability, large dimensional change, easy to produce Curl etc.
Inactive Publication Date: 2011-05-18
SUMITOMO CHEM CO LTD
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Problems solved by technology
[0003] Such an optical film with an adhesive has a large dimensional change due to expansion and contraction under heat or humid heat conditions, so it is prone to curling, etc. In addition, in the state of an optical laminate bonded to a glass substrate, there are the following problems : Foaming in the adhesive layer, floating or peeling between the adhesive layer and the glass substrate, etc.
[0007] The inventors of the present invention have studied a laminate obtained by laminating an optical film with an adhesive disclosed in the above-mentioned gazette on a glass substrate, and found that: The process of cooling down to -30°C from the state of 70°C and then raising the temperature to 70°C is regarded as one cycle. If the heat shock treatment is repeated 100 times, peeling and fogging will occur on the surface of the glass substrate. Durability sometimes not enough
Method used
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Embodiment 1 and Embodiment 2 and comparative example 1～ comparative example 10
[0139] (a) Preparation of adhesive
[0140] Using 100 parts of any one of the acrylic resins A1 to A5 obtained in Polymerization Example 1 to Polymerization Example 5 as the amount of non-volatile components, in which the crosslinking agent shown in Table 1 was mixed in the amount shown in Table 1 ( isocyanate, or a combination of isocyanate and aziridine or epoxy) and a silane compound to obtain an adhesive solution. However, in Table 1, the blending amount (part) of the isocyanate compound "Coronet L" is the amount of solid content. On the release-treated surface of a polyethylene terephthalate film [trade name "PET 3811", purchased from Lintec Corporation, referred to as a spacer] subjected to release treatment, an applicator ( applicator) to apply each adhesive solution with a thickness of 15 μm or 25 μm after drying, and dry at 100° C. for 1 minute to obtain a sheet-shaped adhesive. Table 1 shows the coating film thickness and gel ratio of each adhesive together.
[01...
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Abstract
Disclosed is an optical film having an adhesive agent, which has excellent rework property, is reduced in white spots, is prevented from the occurrence of partial removal or detachment between a glass substrate and an adhesive layer and the occurrence of foaming in the adhesive layer, and has excellent durability. The optical film can be laminated onto a glass substrate to form an optical laminate. The optical film having an adhesive agent can be produced by forming an adhesive layer on the surface of an optical film such as a polarizing film. The adhesive layer is formed with a composition comprising: (A) an acrylic resin which is a copolymer of an alkyl (meth)acrylate and an unsaturated carboxylic acid, has a weight average molecular weight (Mw) of 1,400,000 to 2,000,000 and a ratio between the Mw to a number average molecular weight (Mn) [i.e., a Mw / Mn ratio] of 5 or less, and contains a unit derived from the unsaturated carboxylic acid in an amount of 0.5 to 10 parts by weight relative to the total amount (100 parts by weight) of the resin; (B) an isocyanate compound; (C) an aziridine compound; and (D) a silicone oligomer having a functional group such as a mercapto group and also having an alkoxy group in the molecule.
Description
technical field [0001] The present invention relates to an optical layered body formed by bonding an optical film with an adhesive to a glass substrate. The optical film targeted by the present invention includes, for example, a polarizing film and a retardation film. Background technique [0002] The liquid crystal cell commonly used in liquid crystal display devices such as TN (Twisted Nematic) and STN (Super Twisted Nematic) has a structure in which liquid crystal components are sandwiched between two glass substrates. Further, on the surface of each glass substrate, an optical film such as a polarizing film or a retardation film is laminated via an adhesive mainly composed of an acrylic resin. Here, the optical film is usually distributed in the form of an adhesive-attached optical film having an adhesive layer formed on at least one surface thereof. In the stage of assembling a liquid crystal cell, the adhesive layer side is generally bonded to the glass substrate. Th...
Claims
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IPC IPC(8): G02B5/30B32B7/02C09J7/02C09J133/06G02F1/1335G02F1/13363
CPCC09J133/14C09J7/0217G02F1/133528G02F2201/54G02F1/13363C08L83/04G02F2202/28G02B5/30C08L83/00C09J7/385
Inventor 竹厚流张柱烈
Owner SUMITOMO CHEM CO LTD