# US 2013/0157783 A1 · Golf ball

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- Number: US 2013/0157783 A1
- Document ID: US20130157783A1
- Status: Published application
- Kind: A1
- Application number: 13/409,994
- Filed: 2012-03-01
- Published: 2013-06-20
- Earliest claimed: 2011-12-16
- Assignees: Bridgestone Sports Co., Ltd.
- Inventors: Atsushi KOMATSU; Yuichiro OZAWA; Hiroshi NASU
- Web page: https://patentgrep.com/patent/US20130157783A1

## CPC

- A63B 37/00222: {Physical properties, e.g. hardness}
- A63B 37/0003: {Golf balls}
- A63B 37/0004: {Surface depressions or protrusions}
- A63B 37/0023: {Covers}
- A63B 37/0031: {Hardness}
- A63B 37/0033: {Thickness}
- A63B 37/0045: {Thickness}
- A63B 37/0064: {Diameter}
- A63B 37/0074: {Two piece balls, i.e. cover and core}
- A63B 37/0075: {Three piece balls, i.e. cover, intermediate layer and core}
- A63B 37/0092: {Hardness distribution amongst different ball layers}
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

A golf ball of the present invention includes: a core located in the center of the golf ball; a cover surrounding the outside of the core and having plural dimples on the surface thereof; and a paint layer surrounding the outside of the cover. The paint layer is formed of a material having rubber elasticity. When the golf ball has a μ hardness and the paint layer has a JIS-C hardness, a ratio Sp of the JIS-C hardness of the paint layer with respect to the μ hardness of the golf ball is at most approximately 15. When the cover has a Shore D hardness, a ratio Sc of the Shore D hardness of the cover with respect to the μ hardness of the golf ball may be at most approximately 25.

## Claims

### Claim 1

A golf ball comprising:
a core located in a center of the golf ball;
a cover surrounding an outside of the core and having plural dimples on a surface thereof; and
a paint layer surrounding an outside of the cover, the paint layer formed of a material having rubber elasticity,
wherein the golf ball has a μ hardness, the paint layer has a JIS-C hardness, and a ratio Sp of the JIS-C hardness of the paint layer with respect to the μ hardness of the golf ball is at most approximately 15.

### Claim 2 (depends on 1)

The golf ball according to claim 1, wherein the cover has a Shore D hardness, and a ratio Sc of the Shore D hardness of the cover with respect to the μ hardness of the golf ball is at most approximately 25.

### Claim 3 (depends on 1)

The golf ball according to claim 1, wherein the paint layer has a thickness of at most approximately 100 μm.

### Claim 4 (depends on 1)

The golf ball according to claim 1, wherein the paint layer has a hardness of at most approximately 70 in terms of JIS-C hardness.

### Claim 5 (depends on 1)

The golf ball according to claim 1, wherein a material used for forming the paint layer has a Young's Modulus of at most approximately 70 MPa.

### Claim 6 (depends on 1)

The golf ball according to claim 1, wherein the material for forming the paint layer has a Poisson's ratio of at least approximately 0.45.

### Claim 7 (depends on 1)

The golf ball according to claim 1, wherein the cover contains ionomer resin.

### Claim 8 (depends on 1)

The golf ball according to claim 1, wherein the cover has a hardness of at least 40 in terms of Shore D hardness.