Multi-layer core golf ball
First Claim
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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 15;
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;
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
14 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 15; 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;wherein the inner core layer has a hardness gradient slope (Sinner core) defined as - View Dependent Claims (2, 3, 4, 5)
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6. 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 40; 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 (7, 8, 9, 10)
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11. 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 40; 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 (12, 13, 14)
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Specification
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Current AssigneeAcushnet Company (FILA Holdings Corp.)
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Original AssigneeAcushnet Company (FILA Holdings Corp.)
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InventorsSullivan, Michael J., Comeau, Brian, Goguen, Douglas S.
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Primary Examiner(s)Gorden, Raeann
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Application NumberUS15/880,669Publication NumberTime in Patent Office340 DaysField of Search473373US Class CurrentCPC Class CodesA63B 37/0043 HardnessA63B 37/0044 Hardness gradientA63B 37/0045 ThicknessA63B 37/0051 Materials other than polybu...A63B 37/00621 Centre hardnessA63B 37/00622 Surface hardnessA63B 37/0063 Hardness gradientA63B 37/0064 DiameterA63B 37/0065 Deflection or compressionA63B 37/0075 Three piece balls, i.e. cov...A63B 37/0076 Multi-piece balls, i.e. hav...A63B 37/0092 Hardness distribution among...
