Radiation curable acrylated polyurethane

Claim 1

An acrylated or methacrylated polyurethane produced by the process which comprises the steps of: (A) producing an isocyanate-terminated urethane intermediate by reacting (i) an organic diisocyanate; (ii) an organic tri/tetraol chosen from the group consisting of polyester tri/tetraols and polyether tri/tetraols; and (iii) an organic diol chosen from the group consisting of polyester diols and polyether diols, said organic diisocyanate being employed in equivalent excess to said organic tri/tetraol and organic diol; the ratio of organic diol to organic tri/tetraol employed being from about 1:1 to about 7:1; and provided that when the organic tri/tetraol is a polyester tri/tetraol the organic diol is a polyether diol, and when the organic tri/tetraol is a polyether tri/tetraol the organic diol is polyester diol; then (B) reacting the isocyanate-terminated urethane produced in step (A) with a sufficient amount of an hydroxyacrylate or hydroxymethacrylate to react at least 80% of the isocyanate groups of the intermediate, said hydroxyacrylate or hydroxymethacrylate having the formula ##STR5## wherein Z is hydrogen or methyl and X is linear or branched divalent alkylene of 1 to 10 carbon atoms, cycloalkylene of 5 to 12 carbon atoms, or arylene of 6 to 12 carbon atoms.