Golf ball compositions
First Claim
Patent Images
1. A golf ball comprising:
- a core comprising an inner core layer and an outer core layer; and
a cover comprising an inner cover layer and an outer cover layer;
wherein the inner core layer is formed from a rubber composition comprising;
(a) a base rubber;
(b) at least 0.05 parts by weight of a free radical initiator per 100 parts of the base rubber; and
(c) at least 0.1 parts by weight of a hydroquinone per 100 parts of the base rubber;
wherein a ratio (PHQ/PFRI) of the amount of the hydroquinone present in the rubber composition (PHQ), measured in parts by weight per 100 parts of the base rubber, to the amount of free radical initiator present in the rubber composition (PFRI), measured in parts by weight per 100 parts of the base rubber, is from 0.05 to 2; and
wherein the inner core layer has a positive hardness gradient wherein the difference between the Shore C hardness of the outer surface of the inner core layer (HINNER CORE OUTER SURFACE) and the Shore C hardness of the center of the inner core layer (HCENTER)≧
5 Shore C units; and
wherein the surface hardness of the outer core layer is greater than the material hardness of the inner cover layer.
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Abstract
Golf balls comprising a core and a cover are disclosed. The core is a dual- or multi-layer core, wherein at least one layer is formed from a rubber composition comprising a base rubber, a free radical initiator, and a hydroquinone. A ratio of the amount of the hydroquinone present in the rubber composition, measured in parts by weight, to the amount of free radical initiator present in the rubber composition, measured in parts by weight, is generally from 0.05 to 2. The core layer formed from such rubber composition has a positive hardness gradient such that the difference between the layer'"'"'s outer surface hardness and inner surface hardness is 5 Shore C units or greater.
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Citations
20 Claims
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1. A golf ball comprising:
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a core comprising an inner core layer and an outer core layer; and a cover comprising an inner cover layer and an outer cover layer; wherein the inner core layer is formed from a rubber composition comprising; (a) a base rubber; (b) at least 0.05 parts by weight of a free radical initiator per 100 parts of the base rubber; and (c) at least 0.1 parts by weight of a hydroquinone per 100 parts of the base rubber; wherein a ratio (PHQ/PFRI) of the amount of the hydroquinone present in the rubber composition (PHQ), measured in parts by weight per 100 parts of the base rubber, to the amount of free radical initiator present in the rubber composition (PFRI), measured in parts by weight per 100 parts of the base rubber, is from 0.05 to 2; and wherein the inner core layer has a positive hardness gradient wherein the difference between the Shore C hardness of the outer surface of the inner core layer (HINNER CORE OUTER SURFACE) and the Shore C hardness of the center of the inner core layer (HCENTER)≧
5 Shore C units; andwherein the surface hardness of the outer core layer is greater than the material hardness of the inner cover layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A golf ball comprising:
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a core consisting of an inner core layer and an outer core layer; and a cover comprising an inner cover layer and an outer cover layer; wherein the outer core layer is formed from a rubber composition comprising; (a) a base rubber; (b) at least 0.05 parts by weight of a free radical initiator per 100 parts of the base rubber; and (c) at least 0.1 parts by weight of a hydroquinone per 100 parts of the base rubber; wherein a ratio (PHQ/PFRI) of the amount of the hydroquinone present in the rubber composition (PHQ), measured in parts by weight per 100 parts of the base rubber, to the amount of free radical initiator present in the rubber composition (PFRI), measured in parts by weight per 100 parts of the base rubber, is from 0.05 to 2; and wherein the outer core layer has a positive hardness gradient wherein the difference between the Shore C hardness of the outer surface of the outer core layer (HOUTER SURFACE) and the Shore C hardness of the inner surface of the outer core layer (HOUTER CORE INNER SURFACE)≧
5 Shore C units; andwherein the surface hardness of the outer core layer is greater than the material hardness of the inner cover layer. - View Dependent Claims (12, 13, 14, 15)
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16. A golf ball comprising:
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a core comprising an inner core layer, a first outer core layer, and a second outer core layer; and a cover comprising an inner cover layer and an outer cover layer; wherein at least one of the first and second outer core layers is formed from a rubber composition comprising; (a) a base rubber; (b) at least 0.05 parts by weight of a free radical initiator per 100 parts of the base rubber; and (c) at least 0.1 parts by weight of a hydroquinone per 100 parts of the base rubber; wherein a ratio (PHQ/PFRI) of the amount of the hydroquinone present in the rubber composition (PHQ), measured in parts by weight per 100 parts of the base rubber, to the amount of free radical initiator present in the rubber composition (PFRI), measured in parts by weight per 100 parts of the base rubber, is from 0.05 to 2; and wherein the outer core layer formed from the rubber composition comprising the hydroquinone has a positive hardness gradient wherein the difference between the Shore C hardness of the outer surface of the outer core layer (HOUTER SURFACE) and the Shore C hardness of the inner surface of the outer core layer (HOUTER CORE INNER SURFACE)≧
5 Shore C units; andwherein the surface hardness of the second outer core layer is greater than the material hardness of the inner cover layer. - View Dependent Claims (17, 18, 19, 20)
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Specification