Golf ball resin composition and golf ball

Patent metadata

Field	Value
Publication number	US-9770629-B2
Application number	US-201514940244-A
Country	US
Kind code	B2
Filing date	Nov 13, 2015
Priority date	Dec 24, 2014
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A golf ball resin composition contains a base resin for which, in dynamic viscoelasticity measurement, the storage modulus of the base resin measured at 23° C., 15 Hz and 1.0% strain, and tan δ determined under the same conditions, satisfy specific values; and for which the storage modulus of the base resin measured at 23° C., 15 Hz and 10% strain, and tan δ determined under the same conditions, satisfy specific values. By using this resin composition as a golf ball cover material, the force delivered to the ball while the ball and the clubface are in contact from impact to follow-through is more easily felt, facilitating distance control of the ball. Controllability with a short iron such as a sand wedge around the green is also excellent.

First claim

The invention claimed is:

1. A golf ball resin composition comprising a base resin wherein, in dynamic viscoelasticity measurement,
letting E′(1) be the storage modulus of the base resin measured at a temperature of 23° C., an oscillation frequency of 15 Hz and 1.0% strain, and T(1) be the tan δ defined in terms of the ratio between storage modulus and loss modulus of the base resin measured under the same conditions, E′(1) and T(1) satisfy the following ranges:
1 MPa< E ′(1)<80 MPa,

T (1)>0.16; and

letting E′(10) be the storage modulus of the base resin measured at a temperature of 23° C., an oscillation frequency of 15 Hz and 10% strain, and T(10) be the tan δ defined in terms of the ratio between storage modulus and loss modulus of the base resin measured under the same conditions, E′(10) and T(10) satisfy the following ranges:
1 MPa< E ′(10)<50 MPa,

T (10)>0.2,

wherein the golf ball resin composition does not comprise a saponified polymer and/or a polyamide;
wherein the base resin is a styrene-butadiene-styrene block copolymer and the amount of the styrene-butadiene-styrene block copolymer is 100 wt % of the overall resin composition.

2. The golf ball resin composition of claim 1 , wherein the ratio between styrene and rubber in the styrene-butadiene-styrene block copolymer, expressed as the weight ratio styrene/rubber, is from 20/80 to 60/40.

3. The golf ball resin composition of claim 1 which includes at least one compounding ingredient selected from the group consisting of inorganic fillers, organic short fibers, crosslinking agents and antioxidants.

4. A golf ball comprising a core and a cover of at least one layer encasing the core, wherein at least one layer of the cover is formed of a resin composition comprising a base resin for which, in dynamic viscoelasticity measurement,
letting E′(1) be the storage modulus of the base resin measured at a temperature of 23° C., an oscillation frequency of 15 Hz and 1.0% strain, and T(1) be the tan δ defined in terms of the ratio between storage modulus and loss modulus of the base resin measured under the same conditions, E′(1) and T(1) satisfy the following ranges:
1 MPa< E ′(1)<80 MPa,

T (1)>0.16; and

letting E′(10) be the storage modulus of the base resin measured at a temperature of 23° C., an oscillation frequency of 15 Hz and 10% strain, and T(10) be the tan δ defined in terms of the ratio between storage modulus and loss modulus of the base resin measured under the same conditions, E′(10) and T(10) satisfy the following ranges:
1 MPa< E ′(10)<50 MPa,

T (10)>0.2,

wherein the golf ball resin composition does not comprise a saponified polymer and/or a polyamide;
wherein the base resin is a styrene-butadiene-styrene block copolymer and the amount of the styrene-butadiene-styrene block copolymer is 100 wt % of the overall resin composition.

5. The golf ball of claim 4 , wherein the ratio between styrene and rubber in the styrene-butadiene-styrene block copolymer, expressed as the weight ratio styrene/rubber, is from 20/80 to 60/40.

6. The golf ball of claim 4 which includes at least one compounding ingredient selected from the group consisting of inorganic fillers, organic short fibers, crosslinking agents and antioxidants.

7. The golf ball of claim 4 , wherein the resin composition forms an outermost layer of the cover.

8. The golf ball of claim 7 , wherein the outermost layer has a thickness of from 0.5 to 1.0 mm.

9. The golf ball of claim 4 , wherein the resin composition forms a layer inwardly adjoining an outermost layer of the cover.

10. The golf ball of claim 9 , wherein the combined thickness of the adjoining layer and the outermost layer is from 0.5 to 1.0 mm.

11. The golf ball of claim 4 , wherein the cover comprises, in order from an inner side thereof: an envelope layer, an intermediate layer and an outermost layer.

Assignees

• Bridgestone Sports Co Ltd

Inventors

• Nanba Atsushi

Classifications

• C08L25/10

  with conjugated dienes · CPC title

• A63B37/0039

  characterised by the material · CPC title

• C08L25/04

  Homopolymers or copolymers of styrene · CPC title

• C08L25/08

  Copolymers of styrene (C08L29/08, C08L35/06, C08L55/02 take precedence) · CPC title

• C08L53/02

  of vinyl-aromatic monomers and conjugated dienes · CPC title