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Golf ball cores based on polyalkenamer rubber having positive hardness gradients

  • US 8,845,457 B2
  • Filed: 08/12/2010
  • Issued: 09/30/2014
  • Est. Priority Date: 11/28/2001
  • Status: Expired due to Fees
First Claim
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1. A golf ball, comprising a solid, single core having an outer surface and a geometric center, the core being formed from a rubber composition, the rubber composition comprising a cycloalkene rubber having a trans-bond content of 55% or greater and a melting point of 30°

  • C. or greater in an amount of 80 weight percent, and polybutadiene rubber having a cis-bond content of at least 40% in an amount of 20 weight percent, and peroxide in an amount of 2.5 phr or greater based on weight of the cycloalkene rubber, wherein the geometric center and the outer surface each has a hardness, the hardness of the outer surface being greater than the hardness of the geometric center to define a positive hardness gradient of at least 10 Shore C units; and

    a cover layer surrounding the core.

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