# US 5,704,854 A · Three-piece solid golf ball

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- Number: US 5,704,854 A
- Document ID: US5704854A
- Status: Granted
- Kind: A
- Application number: 08/667,733
- Filed: 1996-06-21
- Granted: 1998-01-06
- Earliest claimed: 1995-06-23
- Assignees: Bridgestone Sports Co., Ltd.
- Inventors: Hiroshi Higuchi; Hisashi Yamagishi
- Web page: https://patentgrep.com/patent/US5704854A

## CPC

- A63B 37/0003: {Golf balls}
- A63B 37/0062: {Hardness}
- A63B 37/0092: {Hardness distribution amongst different ball layers}
- A63B 37/0031: {Hardness}
- A63B 37/0043: {Hardness}
- A63B 37/0047: {Density; Specific gravity}
- A63B 37/0064: {Diameter}
- A63B 37/0075: {Three piece balls, i.e. cover, intermediate layer and core}
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

In a three-piece solid golf ball comprising a center core, an intermediate layer and a cover. The center core is based on rubber, the intermediate layer is formed mainly of a thermoplastic polyester elastomer to a Shore D hardness of 30-55, and the cover is formed mainly of an ionomer resin to a Shore D hardness of 45-54. The cover has a thickness in the range of 1.0-3.0 mm, the intermediate layer has a thickness of 0.5-3.0 mm and the core a thickness of 30-41 mm. The intermediate layer has a specific gravity of at least 1.05. The golf ball has spin receptivity approximate to wound golf balls while maintaining superior flight and durability characteristic of solid golf balls.

## Claims

### Claim 1

A three-piece solid golf ball comprising
a center core composed mainly of a base rubber,
an intermediate layer around the center core formed mainly of a thermoplastic polyester elastomer to a Shore D hardness of 30 to 55, and
a cover around the intermediate layer formed mainly of an ionomer resin to a Shore D hardness of 45 to 54.

### Claim 2 (depends on 1)

The three-piece solid golf ball of claim 1 wherein said intermediate layer has a specific gravity of at least 1.05 and a thickness of 0.5 to 3.0 mm.

### Claim 3 (depends on 1)

The three-piece solid golf ball of claim 1 wherein said cover has a thickness of 1.0 to 3.0 mm.

### Claim 4 (depends on 1)

The three-piece solid golf ball of claim 1 wherein said intermediate layer is softer than said cover by a hardness difference of 2 to 20 Shore D.

### Claim 5 (depends on 1)

The three-piece solid golf ball of claim 1 wherein said center core has a distortion of 2.0 to 5.0 mm under a load of 100 kg and a diameter of 30 to 41 mm.

### Claim 6 (depends on 1)

The three-piece solid golf ball of claim 1 wherein said intermediate layer has a specific gravity in the range of 1.07-1.4.

### Claim 7 (depends on 1)

The three-piece solid golf ball of claim 1 wherein said cover has a specific gravity in the range of 0.9 to 1.0.

### Claim 8 (depends on 1)

The three-piece solid golf ball of claim 1 wherein said golf ball has a distortion of 2.0 to 6.0 mm under a load of 100 kg.

### Claim 9 (depends on 1)

The three-piece solid golf ball of claim 1 wherein said intermediate layer is formed of a mixture of a thermoplastic elastomer and an ionomer resin.

### Claim 10 (depends on 1)

The three-piece solid golf ball of claim 1 wherein said core is formed of 1,4-polybutadiene rubber having at least 40% of cis structure.