| 摘要 |
<p>The present invention relates to an acrylic pressure-sensitive adhesive sheet including: a viscoelastic material layer (X) containing hollow microspheres; and a pressure-sensitive adhesive layer (Y) provided on at least one face of the viscoelastic material layer (X) and formed from a pressure-sensitive adhesive composition including, as a main component, an acrylic copolymer which is constructed from the following monomers (m1) and (m2) as an essential monomer component, in which a content of the monomer (m1) is 50 to 99.9% by weight and a content of the monomer (m2) is 0.1 to 25% by weight based on a total amount of monomer components constituting the acrylic copolymer,
(m1) an alkyl(meth)acrylate monomer including an alkyl group having 1 to 20 carbon atoms, which is represented by the following formula (1), Chem . 1 CH 2 = C R 1 �¢ COOR 2
in which R 1 represents a hydrogen atom or a methyl group, and R 2 represents an alkyl group having 1 to 20 carbon atoms,
(m2) an N-hydroxyalkyl(meth)acrylamide monomer including a hydroxyalkyl group having 1 to 4 carbon atoms, which is represented by the following formula (2), Chem . 2 CH 2 = C R 3 �¢ CONHR 4
in which R 3 represents a hydrogen atom or a methyl group, and R 4 represents a hydroxyalkyl group having 1 to 4 carbon atoms.</p> |
