Resin composition for golf balls, and golf ball

Patent metadata

Field	Value
Publication number	US-10888740-B2
Application number	US-201916687898-A
Country	US
Kind code	B2
Filing date	Nov 19, 2019
Priority date	Jun 22, 2017
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A resin composition for golf balls includes specific amounts of (A) polyurethane or polyurea and (B) an oxazoline group-containing acrylic polymer or an oxazoline group-containing styrene polymer. A golf ball having a core encased by a cover of one or more layers, wherein at least one cover layer is formed of this resin composition, exhibits a good adhesion between adjoining layers, enabling the ball to achieve a high scuff resistance without lowering the initial velocity of the ball.

First claim

The invention claimed is:

1. A golf ball comprising a core and a cover of one or more layers which encases the core, wherein at least one layer of the cover is formed of the resin composition, comprising:
(A) polyurethane or polyurea,
(B) an oxazoline group-containing acrylic polymer or an oxazoline group-containing styrene polymer, and
(C) a material having functional groups which react with oxazoline groups,
wherein component (B) is included in an amount of from 0.3 to 30 parts by weight per 100 parts by weight of component (A) and wherein component (C) is polyesters or polyamides, and the proportion of the polyurethane or polyurea serving as component (A) in the overall resin composition accounted for at least 60 wt %.

2. The golf ball of claim 1 , wherein a layer adjoining the cover layer formed of the resin composition of claim 1 is formed of a composition comprising (D) a material having functional groups which react with oxazoline groups.

3. The golf ball of claim 2 , wherein component (D) is at least one selected from the group consisting of polyesters, polyamides, olefin-unsaturated carboxylic acid random copolymers, olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester random copolymers, metal ion neutralization products of olefin-unsaturated carboxylic acid random copolymers, metal ion neutralization products of olefin-unsaturated carboxylic acid unsaturated carboxylic acid ester random copolymers, α,β-unsaturated carboxylic acids of 3 to 8 carbon atoms, and metal salts of α,β-unsaturated carboxylic acids of 3 to 8 carbon atoms.

4. The golf ball of claim 3 , wherein the selected kind of component (D) differs from the material of component (C).

5. The golf ball of claim 1 , wherein the acrylic polymer or styrene polymer of component (B) has a number-average molecular weight (Mn) of from 1,000 to 100,000 and a weight-average molecular weight (Mw) of from 1,000 to 250,000.

6. The golf ball of claim 1 , wherein component (B) is included in an amount of from 2 to 15 parts by weight per 100 parts by weight of component (A).

7. The golf ball of claim 1 , wherein component (C) is included in an amount of from 0.3 to 30 parts by weight per 100 parts by weight of component (A).

8. The golf ball of claim 1 , wherein the oxazoline group content within the acrylic polymer or styrene polymer of component (B) is from 0.1×10 −3 to 10×10 −3 mol/g (solids).

9. The golf ball of claim 1 , wherein all of the resin components consists of component (A), component (B) and component (C).

Assignees

• Bridgestone Sports Co Ltd

Inventors

• Mochizuki Katsunobu
• Yamabe Masahiro
• Namba Atsushi

Classifications

• A63B37/0027 Primary

  Polyurea · CPC title

• A63B37/0039

  characterised by the material · CPC title

• A63B37/0024

  Materials other than ionomers or polyurethane · CPC title

• A63B37/0075

  Three piece balls, i.e. cover, intermediate layer and core · CPC title

• A63B37/0074

  Two piece balls, i.e. cover and core · CPC title