Patent ID: 7371460

Claim:
A highly adhesive pressure sensitive adhesive composition comprising at least: (A) a hydroxyl-group-containing acrylic polymer as a base polymer, in which the content of the hydroxyl-group-containing copolymerizable monomer is equal to or greater than 0.01 mole % and less than 20 mole % based on the total amount of monomer components; (B) an amine compound containing plural hydroxyl groups as a curing aid, said amine compound being represented by formula (1) wherein: R 1 , R 1 , R 3 , and R 4 are the same or different and each is a hydrogen atom or a group of the formula —(R 5 O) m (R 6 O) n —H in which R 5 and R 6 are different from one another and each is an alkylene group and each of m and n is an integer of equal to or more than 0, provided that m and n are not concurrently 0 and provided that at least two of R 1 , R 1 , R 3 , and R 4 are a group of the formula —(R 5 O) m (R 6 O) n —H; X is a divalent hydrocarbon group; and p is an integer of equal to or more than 1; and (C) a polyisocyanate compound as a curing agent, wherein a dried or cured product of the composition has a gel fraction of equal to or more than 10% by weight and less than 70% by weight, wherein the composition satisfies the following conditions: (i) M B /M A ranges from 0.05 to 500; and (ii) M C /[M A +M B ] ranges from 0.05 to 500, in which conditions M A , M B and M C are molar values, with: M A being the content of hydroxyl groups derived from the hydroxyl-group-containing acrylic polymer (A); M B being the content of hydroxyl groups derived from the amine compound (B) containing plural hydroxyl groups; and M C being the content of isocyanate groups derived from the polyisocyanate compound (C).