Patent ID: 7294656

Claim:
A radiation curable coating composition comprising A) about 5 to 95% by weight of the reaction product of i) one or more di- and/or polyisocyanates and ii) a hydroxyl component comprising ii-a) one or more hydroxy functional lactone ester (meth)acrylates having a number average molecular weight of about 200 to 2000 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 2 to 10 carbon atoms, which may be substituted with one or more alkyl groups having 1 to 12 carbon atoms, and R 3 represents a straight or branched chain alkylene group having 3 to 8 carbon atoms, which may be substituted with one or more alkyl groups having 1 to 12 carbon atoms, and ii-b) up to 30 hydroxyl equivalent %, based on the total hydroxyl equivalents of component A-ii), of a hydroxyl compound other than A-ii-a), wherein the NCO:OH equivalent ratio of component A-i) to component A-ii) is 1.10:1 to 1:1.10, B) about 5 to 95% by weight of the reaction product of i) one or more di- and/or polyisocyanates with ii) a hydroxyl component comprising ii-a) one or more hydroxy functional (meth)acrylates of the formula: HO—R 2 —O—(O═)C—C(R 1 )═CH 2 wherein R 1 and R 2 are as defined above, and ii-b) up to 30 hydroxyl equivalent %, based on the total hydroxyl equivalents of component B-ii), of a hydroxyl compound other than B-ii-a), wherein the NCO:OH equivalent ratio of component B-i) to component B-ii) is 1.10:1 to 1:1.10, C) 0 to about 30% by weight of one or more reactive diluents comprising a member selected from the group consisting of mono-, di-, tri- and tetra (meth)acrylates, and D) about 0.1 to 10% by weight of one or more photoinitiators, wherein the %'s by weight of components A), B) and C) total 100%, based on the total weight of components A), B) and C), and wherein the % by weight of component D) is based on the total weight of components A), B), and C), and E) about 5 to 95% by weight, based on the weight of components A), B), C) and D) of a solvent or solvent mixture.