Patent ID: 8778476

Claim:
An optical storage device comprising discs made from polycarbonate comprising a UV curable bonder material consisting of A) an urethane acrylate oligomer as binder, which is the reaction product of i) one or more polyisocyanates and ii) one or more hydroxyfunctional lactone ester acrylates having a number average molecular weight of from 200 g/mol to 2000 g/mol and having the formula: CH 2 ═C(R 1 )—C(O)—O—R 2 —[O—C(O)—R 3 ] n —OH wherein, n is an integer from 1 to 5, R 1 is hydrogen or methyl, R 2 represents an alkylene group or substituted alkylene group having from 2 to 10 carbon atoms and R 3 represents a straight or branched chain alkylene group of from 3 to 8 carbon atoms, and which may be substituted with one or more alkyl groups having from 1 to 12 carbon atoms, B) a reactive thinner, comprising monofunctional (meth)acrylates C) a photoinitiator and D) optional additives; wherein the optical storage device is a DVD.