Patent ID: 11938379
Assignee: ACUSHNET COMPANY
Field: Furniture, games (Other fields)
Classification: CPC A | IPC A

Claim 12:
13. A golf ball, comprising:
a solid core having an outer surface and a geometric center, wherein the solid core is formed from a rubber composition cured under heat, the rubber composition comprising:
a base rubber comprising a mixture of two or more polybutadiene rubbers and ethyl ene-propyl ene-di ene rubber,
dicumyl peroxide,
zinc diacrylate,
calcium sulfate dihydrate in an amount of about 1 phr to about 3.75 phr,
an additive selected from zinc pentachlorothiophenol, zinc oxide, barium sulfate, or combinations thereof,

wherein the geometric center and the outer surface each has a hardness and the hardness of the geometric center ranges from about 40 Shore C to about 70 Shore C and the hardness of the outer surface ranges from about 75 Shore C to about 105 Shore C,
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 34 Shore C units;
an inner cover layer surrounding the core; and
an outer cover layer disposed about the inner cover layer.