Heat-releasable pressure -sensitive adhesive tape or sheet

Abstract

The present invention provides a pressure-sensitive adhesive tape or sheet exhibiting good adhesiveness to a variety of adherends and further having both characteristics of repelling resistance and easy peelability. The heat-releasable pressure-sensitive adhesive tape or sheet according to the present invention has a heat-releasable pressure-sensitive adhesive layer containing: as an essential component, an acrylic copolymer formed of a monomer mixture comprising the following monomer (ml) and monomer (m2), with a content of the monomer (m1) being from 40 to 97.5% by weight and a content of the monomer (m2) being from 0.5 to 20% by weight, relative to the whole of monomer components; and a thermal foaming agent: (m1) an alkyl(meth)acrylate monomer having an alkyl group with a carbon number of from 1 to 12, represented by the following formula (1): [Chem. 1] CH2═C(R1)COOR2   (1) (in the formula (1), R1 represents a hydrogen atom or a methyl group, and R2 represents an alkyl group with a carbon number of from 1 to 12); and (m2) an N-hydroxyalkyl(meth)acrylamide monomer having a hydroxyalkyl group with a carbon number of from 1 to 4, represented by the following formula (2): [Chem. 2] CH2═C(R3)CONHR4   (2) (in the formula (2), R3 represents a hydrogen atom or a methyl group, and R4 represents a hydroxyalkyl group with a carbon number of from 1 to 4).

Dependencies are inferred from the claim text.