POLARIZING PLATE HAVING SILICONE PROTECTIVE FILM, AND IMAGE DISPLAY DEVICE

摘要

Disclosed is a polarizing plate characterized by being produced by bonding a protective film to a polarizing element with an adhesive agent comprising an urethane polymer, wherein the protective film is a cured film of a silicone resin composition that comprises a silicone resin (A) represented by the following general formula: [RSiO3/2]n (wherein R represents an organic functional group having a (meth)acryloyl group; and n represents 8, 10 or 12) and mainly composed of a polyorganosilsesquioxane having a cage-type structure, an urethane oligomer (B) containing at least one unsaturated group represented by the following formula: -R3-CR4=CH2 or -CR4=CH2 (wherein R3 represents an alkylene group, an alkylidene group, or a group -OCO-; and R4 represents a hydrogen atom or an alkyl group) in the molecule and having a number average molecular weight of 2500 or greater, and a polymerizable unsaturated compound (C) that is different from the oligomer (B), and wherein the proportion of the contents of the components (A), (B) and (C) is (5 to 80):(1 to 50):(10 to 80) by weight. In the polarizing plate, the polarizing element and the protective film comprising the silicone resin can be bonded together strongly in a simple manner. The polarizing plate has excellent wet heat resistance and excellent light resistance, and can exhibit good durability under severe use conditions having high temperatures, high light densities or the like. When the polarizing plate is used in an image display device such as a liquid crystal projector, the polarizing plate can exhibit excellent burning resistance and excellent adhesion and enables the improvement in the display quality of the image display device.