Patent ID: 6337128
Filing Date: 2002-01-08
Classification: B32B,C08L,C09J,Y10T

Abstract:
A pressure-sensitive adhesion sheet, which comprises a foamed base material having formed on at least one surface thereof a layer composed of an acrylic pressure-sensitive adhesive comprising a copolymer comprising:(a) 60 to 94% by weight of an acrylic monomer represented by formula (1a): CH2=C(R1)COOR2 wherein R1 is a hydrogen atom or a methyl group; and R2 is an alkyl group having 4 to 14 carbon atoms, (b) 5 to 40% by weight of a (meth) acrylamide represented by formula (2a): CH2=C(R3)CONR4R5 wherein R3 is a hydrogen atom or a methyl group; R4 is a hydrogen atom or an alkyl group; and R5 is an alkyl group or an organic group which is bonded to R4 to form a hetero ring together with a N atom, and (c) 1 to 10% by weight of a monomer having an acidic group, each based on the total content of components a), b) and c), wherein the foamed base material has a water absorption rate less than 15% by weight after having been immersed in warm water having a temperature of 40Â° C. for 24 hours.