Patent ID: 6869678

Claim:
A removable pressure-sensitive adhesive which comprises: 100 parts by weight on a solid basis of an aqueous dispersion type acrylic copolymer and a water-soluble crosslinking agent having an oxazoline group, wherein the aqueous dispersion type acrylic copolymer is obtained by polymerizing in an aqueous medium a monomer mixture comprising (A) from 50 to 99.9% by weight at least one acrylate monomer represented by general formula (1): CH 2 ═CR 1 COOR 2 wherein R 1 represents a hydrogen atom or a methyl group and R 2 represents an alkyl group having 2 to 14 carbon atoms, (B) from 0.1 to 5% by weight at least one carboxyl group-containing monomer, and (C) from 0 to 49.9% by weight one or more monomers copolymerizable with ingredients (A) and (B), in the presence of (D) one member or a combination of two or more members selected from the group consisting of at least one nonionic surfactant having an ethylenic double bond copolymerizable with the monomer mixture and at least one anionic surfactant having an ethylenic double bond copolymerizable with the monomer mixture, the amount of ingredient (D) being from 0.1 to 6 parts by weight per 100 parts by weight of the monomer mixture; and from 0.1 to 3 parts by weight of a hindered-amine light stabilizer having a piperidine ring wherein the nitrogen atom has a tertiary amine structure, and wherein the amount of the crosslinking agent being such that the amount of the oxazoline groups is from 0.1 to 5 equivalents to the carboxyl groups of the aqueous dispersion type acrylic copolymer.