Patent ID: 8632880

Claim:
A foam member fixing sheet for fixing a foam member to an adherend, wherein (a) the fixing sheet is a double-sided pressure sensitive adhesive sheet comprising a pressure sensitive adhesive layer formed of an aqueous pressure sensitive adhesive composition; (b) the aqueous pressure sensitive adhesive composition comprises an acrylic polymer, a tackifier, and water, wherein the acrylic polymer is dispersed in the water; (c) the amount of the acrylic polymer is greater than 50% by mass based on the solids content of the composition; (d) the acrylic polymer is obtained by polymerizing a starting monomer material comprising an alkyl(meth)acrylate, acrylic acid, and methacrylic acid, wherein the alkyl(meth)acrylate content of the total starting monomer material is greater than 50% by mass, the alkyl(meth)acrylate comprises a (meth)acrylic acid ester of a C 4-8 alkyl alcohol, the mass ratio of acrylic acid to methacrylic acid (AA:MAA) in the starting monomer is in the range of 1:4 to 4:1, and of the total amount of the alkyl(meth)acrylate contained in the starting monomer material, the (meth)acrylic acid ester of a C 4-8 alkyl alcohol amounts to 70 mass % or greater; (e) the tackifier is a rosin-based resin or a rosin derivative resin; and (f) the tackifier is present in an amount of 5 to 40 parts by mass based on 100 parts by mass of the acrylic polymer.