Patent ID: 7019041

Claim:
A radiation-curable composition comprising a non-gelled copolymer comprised of at least 30 mole % of residues having the following alternating units of the structure: wherein n is an integer from 1 to 10,000; R 1 is linear or branched C 1 to C 4 alkyl; R 2 is selected from the group consisting of methyl, linear, cyclic or branched C 2 to C 20 alkyl, alkenyl, aryl, alkaryl and aralkyl; and R 3 comprises a moiety that is capable of undergoing a polymerization reaction when exposed to actinic radiation or ionizing radiation; wherein the moiety is present in amounts of at least 15 mole % of the copolymer and is derived from isobutylene, diisobutylene, dipentene, 1-octene or isoprenol.