Radiation curable urethane (meth)acrylate polymer and adhesives formulated with them

UV curable urethane (meth)acrylate polymers of Formula (1), where: R1 and R′ are each independently hydrogen or C1-20hydrocarbo, R2, R′2, R3 and R4 are each independently optionally substituted divalent organo group, and p is an integer from about 6 to about 100 which are useful as laminating and/or pressure sensitive adhesives are disclosed as is methods of making them. The oligomers/polymers comprise a urethane extended backbone formed by reacting diisocyanates with polyols derived from rubber oligomers/polymers.