Patent ID: 11944875
Assignee: ACUSHNET COMPANY
Field: Furniture, games (Other fields)
Classification: CPC A | IPC A

Claim 0:
1. A golf ball, comprising:
a dual core comprising an outer core layer disposed over an inner core layer, wherein at least the inner core layer 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 inner core layer has a geometric center and an outer surface, each having a hardness, the hardness of the geometric center ranging from about 40 Shore C to about 70 Shore C and the hardness of the outer surface ranging from about 75 Shore C to about 105 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 dual core, wherein the cover layer comprises an ionomer, polyurethanes, polyureas, polyurethane-urea hybrids, or copolymers and blends thereof.