Patent ID: 6992142

Claim:
A golf ball comprising: a center comprising a resilient polymer comprising: a rubber material having a molecular weight of greater than about 200,000, wherein the rubber material has a resilience index of at least about 40, and wherein the resilience index of the rubber material is calculated using the formula: Resilience Index=100,000*[(Tan δ at 10 cpm)−(Tan δ at 1000 cpm)]/990; a crosslinking material present in an amount of about 10 to about 40 parts per hundred of the resilient polymer; a free radical source present in an amount of about 0.1 to about 15 parts per hundred of the resilient polymer; a cis-to-trans catalyst present in an amount of about 0.1 to about 10 parts per hundred of the resilient polymer, wherein the cis-to-trans catalyst comprises a metal organosulfur compound; and a cover comprising a thermoplastic or thermoset polyurethane.