Patent ID: 8551394

Claim:
A method of forming a golf ball, comprising the steps of: providing a golf ball core comprising a thermoset material; forming an in-situ multi-modal mixture by: providing a first acid copolymer having a molecular weight of about 70,000 or greater; providing a second acid copolymer having a molecular weight of about 40,000 or less; providing a neutralizing agent; mixing the first acid copolymer, the second acid copolymer, the neutralizing agent, and, optionally, a processing aid, to form the in-situ multi-modal mixture; providing a thermoplastic polymer; forming a cover material comprising the multi-modal mixture and about 60 percent to about 90 percent by weight of a thermoplastic polymer, wherein the cover material has a flexural modulus of about 35,000 psi to about 65,000 psi after 2 weeks; forming a cover disposed about the core with the cover material.