Patent ID: 8796350

Claim:
An ultra-violet curable pressure sensitive adhesive comprising an acrylic polymer and a cationic photoinitiator, wherein said acrylic polymer is prepared from the group consisting of: (i) an acrylic monomer consisting of an acrylic or methacrylic acid derivative of the formula CH 2 ═CH(R 1 )(COOR 2 ), wherein R 1 is H or CH 3 and R 2 is C 1-20 alkyl chain; (ii) a monomer, wherein said monomer comprises a pendant reactive functional group selected from cycloaliphatic epoxide, oxetane or mixtures thereof, and contains from about 0.001 to about 0.015 equivalent per 100 g of said acrylic polymer; wherein the acrylic polymer (a) is essentially free of multi-(meth)acrylate, (b) has a Tg value less than 0° C., and (c) has a weight average molecular weight from about 50,000 to about 1,000,000 g/mol; and wherein the ultra-violet curable pressure sensitive adhesive has a viscosity range of 1,000-500,000 mPa·s at 80-180° C.