Golf balls having at least two core layers formed from HNP compositions
First Claim
Patent Images
1. A golf ball comprising a core and a cover, wherein the core has an overall diameter of from 1.40 inches to 1.60 inches and consists of:
- (a) a center having a diameter of from 0.50 inches to 1.50 inches, a surface hardness of 65 Shore C or greater, a center hardness (H), and formed from a first HNP composition, the first HNP composition having a material hardness of 55 Shore D or less and comprising a highly neutralized ethylene/(meth)acrylic acid/alkyl (meth)acrylate copolymer;
(b) an intermediate core layer having a surface hardness (I) of 40 Shore C or greater and formed from a rubber composition; and
(c) an outer core layer having a surface hardness (S) of from 20 Shore C to 70 Shore C and formed from a second HNP composition, the second HNP composition having a material hardness of 45 Shore D or greater and comprising a highly neutralized ethylene/(meth)acrylic acid copolymer;
wherein H<
I and S<
I and H<
S, and wherein S−
H=D, where D is an integer from 1 to 22, andwherein the material hardness of the first HNP composition is less than the material hardness of the second HNP composition.
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Abstract
The present invention is directed to golf balls consisting of a multi-layer core and a cover. The multi-layer core consists of a center and an outer core layer that are both soft relative to a hard rubber intermediate core layer. The outer core layer is preferably thin relative to the center and the outer core layer. The multi-layer core includes at least one layer formed from a relatively soft HNP composition and at least one layer formed from a relatively hard HNP composition.
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Citations
3 Claims
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1. A golf ball comprising a core and a cover, wherein the core has an overall diameter of from 1.40 inches to 1.60 inches and consists of:
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(a) a center having a diameter of from 0.50 inches to 1.50 inches, a surface hardness of 65 Shore C or greater, a center hardness (H), and formed from a first HNP composition, the first HNP composition having a material hardness of 55 Shore D or less and comprising a highly neutralized ethylene/(meth)acrylic acid/alkyl (meth)acrylate copolymer; (b) an intermediate core layer having a surface hardness (I) of 40 Shore C or greater and formed from a rubber composition; and (c) an outer core layer having a surface hardness (S) of from 20 Shore C to 70 Shore C and formed from a second HNP composition, the second HNP composition having a material hardness of 45 Shore D or greater and comprising a highly neutralized ethylene/(meth)acrylic acid copolymer; wherein H<
I and S<
I and H<
S, and wherein S−
H=D, where D is an integer from 1 to 22, andwherein the material hardness of the first HNP composition is less than the material hardness of the second HNP composition. - View Dependent Claims (2, 3)
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Specification