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

Claim 14:
15. A golf ball, comprising:
a multi-layered core comprising a center and at least three core layers formed around the center, wherein the center and at least one of the core layers are formed of a rubber composition cured under heat, the rubber composition comprising:
a base rubber comprising polybutadiene rubber having a 1,4 cis-bond content of at least 90 percent,
dicumyl peroxide,
zinc diacrylate,
calcium sulfate dihydrate present in the rubber composition in an amount of about 1 phr to about 3.9 phr, and
an additive selected from zinc pentachlorothiophenol, zinc oxide, barium sulfate, or combinations thereof, and
wherein the center has a geometric center having a first hardness and an outer surface having a second hardness, the first hardness ranging from about 40 Shore C to about 70 Shore C and the second hardness ranging from about 75 Shore C to about 105 Shore C, and the second hardness is greater than the first hardness to define a positive hardness gradient of at least 34 Shore C units;

an inner cover layer surrounding the multi-layered core; and
an outer cover layer disposed about the inner cover layer.