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Abstract

An object is to provide a pressure-sensitive adhesive composition for a polarizer that is excellent in durability and simultaneously is excellent in prevention of leakage of light, without the use of a high-energy light ray. The pressure-sensitive adhesive composition for a polarizer contains components (A) to (C) and having a gel fraction of 91% or more. (A) 100 parts by weight of an acrylic polymer that is obtained by copolymerizing at least the following monomer components (a1) to (a3), and has a weight average molecular weight of 500,000 to 2,000,000 and a ratio (Mw/Mn) of the weight average molecular weight (Mw) to a number average molecular weight (Mn) of 8 or less: (a1) 45 to 94.9% by mass of an alkyl (meth)acrylate ester monomer, (a2) 0.1 to 5% by mass of a carboxyl group-containing monomer, and (a3) 5 to 50% by mass of a benzene ring-containing monomer; (B) 4 to 12 parts by weight of a tolylene diisocyanate crosslinking agent; and (C) 0.05 to 1 part by weight of a silane coupling agent that has reactivity with a carboxyl group, wherein the benzene ring-containing monomer of the monomer component (a3) is 5 times or more in terms of mole of the tolylene diisocyanate crosslinking agent of the component (B).

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