Patent ID: 11944874
Assignee: ACUSHNET COMPANY
Field: Furniture, games (Other fields)
Classification: CPC A  C | IPC A  C

Claim 0:
1. A golf ball, comprising:
a multi-layered core comprising a center and a plurality of core layers formed around the center,
wherein at least the center is formed of a rubber composition cured under heat, the rubber composition comprising:
a base rubber comprising polybutadiene rubber,
an organic peroxide,
a cross-linking co-agent comprising a zinc salt of an acrylate, diacrylate, methacrylate, or dimethacrylate,
calcium sulfate dihydrate in an amount of about 1 phr to about 3.9 phr,
wherein the center has an outer surface and a geometric center, each having a hardness, and the hardness of the geometric center ranges from about 45 Shore C to about 65 Shore C and the hardness of the outer surface ranges from about 80 Shore C to about 100 Shore C, and
wherein the hardness of the outer surface is greater than the hardness of the geometric center to define a positive hardness gradient of at least 30 Shore C units; and

a cover layer surrounding the multi-layered core, wherein the cover layer comprises an ionomer, polyurethanes, polyureas, polyurethane-urea hybrids, or copolymers and blends thereof.