Multi-layer core golf ball
First Claim
Patent Images
1. A golf ball comprising a core and a cover, wherein the core comprises:
- a solid inner core layer formed from an unfoamed composition and having a diameter of 1.10 inches or less, a center Shore C hardness (Hcenter) of 15 or less, and an interface Shore C hardness (Hinner core interface) of from 5 to 35;
one or more optional intermediate core layers; and
an outer core layer having a thickness of 0.20 inches or greater, an inner surface Shore C hardness (Houter core inner surface) of from 40 to 75, and an outer surface Shore C hardness (Houter surface) of 80 or greater;
wherein Houter surface−
Hcenter≧
70; and
wherein the inner core layer has a hardness gradient slope (Sinner core) defined as
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Abstract
Golf balls having a very high positive gradient multilayer core are provided. The multilayer core includes an outer core layer and a very soft, low compression inner core layer. The inner core layer is formed from an unfoamed composition and has a center hardness that is at least 40 Shore C points less than the outer surface hardness of the outer core layer.
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Citations
20 Claims
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1. A golf ball comprising a core and a cover, wherein the core comprises:
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a solid inner core layer formed from an unfoamed composition and having a diameter of 1.10 inches or less, a center Shore C hardness (Hcenter) of 15 or less, and an interface Shore C hardness (Hinner core interface) of from 5 to 35; one or more optional intermediate core layers; and an outer core layer having a thickness of 0.20 inches or greater, an inner surface Shore C hardness (Houter core inner surface) of from 40 to 75, and an outer surface Shore C hardness (Houter surface) of 80 or greater; wherein Houter surface−
Hcenter≧
70; andwherein the inner core layer has a hardness gradient slope (Sinner core) defined as - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A golf ball comprising a core and a cover, wherein the core comprises:
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a solid inner core layer formed from an unfoamed composition and having a diameter of 1.20 inches or less, a center Shore C hardness (Hcenter) of 40 or less, and an interface Shore C hardness (Hinner core interface) of from 5 to 50; one or more optional intermediate core layers; and an outer core layer having a thickness of 0.10 inches or greater, an inner surface Shore C hardness (Houter core inner surface) of from 40 to 75, and an outer surface Shore C hardness (Houter surface) of 80 or greater; wherein Houter surface−
Hcenter≧
40; andwherein the inner core layer has a hardness gradient slope (Sinner core) defined as - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A golf ball comprising a core and a cover, wherein the core consists essentially of:
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a solid inner core layer formed from an unfoamed composition and having a diameter of 1.10 inches or less, a center Shore C hardness (Hcenter) of 40 or less, and an interface Shore C hardness (Hinner core interface) of from 5 to 50; an intermediate core layer; and an outer core layer having a thickness of 0.20 inches or greater, an inner surface Shore C hardness (Houter core inner surface) of from 40 to 75, and an outer surface Shore C hardness (Houter surface) of 80 or greater; wherein Houter surface−
Hcenter≧
40; andwherein the inner core layer has a hardness gradient slope (Sinner core) defined as - View Dependent Claims (16, 17, 18, 19, 20)
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Specification