Patent ID: 8193296

Claim:
A golf ball comprising: a crosslinked thermoplastic polyurethane elastomer; the crosslinked thermoplastic polyurethane elastomer including hard segments and soft segments; wherein the crosslinked thermoplastic polyurethane elastomer includes crosslinks formed from allyl ether side groups, and the crosslinked thermoplastic polyurethane elastomer is the reaction product formed from reacting an organic isocyanate with a mixture of the following reactants: (a) an unsaturated diol chain extender, wherein the unsaturated diol chain extender has two primary hydroxyl groups and at least one allyl ether side group, of the formula in which R is alkyl group with or without modified functional groups, and x and y are integers of 1 to 4; (b) a secondary chain extender, having at least two reaction sites with isocyanates and having a molecular weight of less than about 450; (c) a long chain polyol having a molecular weight of between about 500 and about 4,000; and (d) a sufficient amount of free radical initiator, so as to be capable of generating free radicals that induce crosslinking structures in the hard segments by free radical initiation.