Patent ID: 9683148
Date: 2017-06-20
CPC Classifications: C08F,C09J

Claim:
1. An adhesive comprising: a block copolymer comprising at least one structure represented by formula (I): wherein, in formula (I): [A1] represents a polymer block comprising a structural unit derived from a methacrylic acid ester (A1), and [B/A2] represents a copolymer block comprising a structural unit derived from an acrylic acid ester (B) and a structural unit derived from a methacrylic acid ester (A2), and the copolymer block [B/A2] comprises a gradient copolymer block section in which a copolymerization ratio of the methacrylic acid ester (A2) continuously increases from a section connected to the polymer block [A1]; wherein the block copolymer comprises: a total content of the structural units derived from the methacrylic acid ester (A1) and the methacrylic acid ester (A2) of 5% to 60% by mass, a weight-average molecular weight (Mw) of 30,000 to 300,000, and a molecular weight distribution (Mw/Mn) of 1.0 to 1.5.