Golf ball cores based on polyalkenamer rubber having positive hardness gradients
First Claim
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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Accused Products
Abstract
Golf balls having a core comprising a polyalkenamer rubber composition are provided. The rubber composition may further include other rubbers such as, for example, polybutadiene, polyisoprene, ethylene propylene rubber, ethylene propylene diene rubber, and styrene-butadiene rubber. The rubber composition helps improve resiliency of the core and provides the ball with a comfortable and soft feel. In one version, a solid, single core having an outer surface and geometric center is provided, wherein the outer surface has a hardness greater than the hardness of the geometric center to define a positive hardness gradient of at least 10 Shore C. In a second version, a dual-core having an inner core and surrounding outer core layer is provided. The inner core has a positive hardness gradient, while the outer core has a zero; negative; or positive hardness gradient.
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Citations
11 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- 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
Specification