Golf ball resin composition and golf ball

Patent metadata

Field	Value
Publication number	US-2016287944-A1
Application number	US-201615067731-A
Country	US
Kind code	A1
Filing date	Mar 11, 2016
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

An object of the present invention is to provide a material for obtaining a golf ball having excellent shot feeling and flight distance. The present invention provides a golf ball resin composition having a ratio (flexural elastic modulus/slab hardness) of a flexural elastic modulus (MPa) to a slab hardness (Shore D hardness) in a range from 3 to 5, and containing, as a resin component, (A) a polyamide resin, (B) at least one selected from the group consisting of (b-1) a binary copolymer, (b-2) a metal ion-neutralized product of a binary copolymer, (b-3) a ternary copolymer and (b-4) a metal ion-neutralized product of a ternary copolymer, and (C) a thermoplastic elastomer.

First claim

1 . A golf ball resin composition having a ratio (flexural elastic modulus/slab hardness) of a flexural elastic modulus (MPa) thereof to a slab hardness (Shore D hardness) thereof in a range from 3 to 5, and containing, as a resin component, (A) a polyamide resin, (B) at least one selected from the group consisting of (b-1) a binary copolymer composed of an olefin and an a,6-unsaturated carboxylic acid having 3 to 8 carbon atoms, (b-2) a metal ion-neutralized product of a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, (b-3) a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and an α,β-unsaturated carboxylic acid ester, and (b-4) a metal ion-neutralized product of a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and an α,β-unsaturated carboxylic acid ester, and (C) a thermoplastic elastomer different from the (A) component and the (B) component.

2 . The golf ball resin composition according to claim 1 , wherein a ratio (slab hardness×flexural elastic modulus/content of (A) component) of a product obtained by multiplying the slab hardness (Shore D hardness) by the flexural elastic modulus (MPa) to a content (mass %) of the (A) component in the resin component of the golf ball resin composition is 1050 or less.

3 . The golf ball resin composition according to claim 1 , wherein the slab hardness of the golf ball resin composition ranges from 45 to 65 in Shore D hardness.

4 . The golf ball resin composition according to claim 1 , wherein the flexural elastic modulus of the golf ball resin composition ranges from 130 MPa to 400 MPa.

5 . The golf ball resin composition according to claim 1 , wherein a mass ratio ((A): (B): (C)) of the (A) component, the (B) component and the (C) component ranges from 10 to 60: 5 to 80: 5 to 50 (a total of the (A) component, the (B) component and the (C) component is 100).

6 . The golf ball resin composition according to claim 1 , wherein the (C) component contains a styrene-based thermoplastic elastomer.

7 . A golf ball comprising a core, at least one intermediate layer covering the core, and a cover covering the intermediate layer, wherein at least one member of the core, at least one intermediate layer and the cover is formed from a golf ball resin composition having a ratio (flexural elastic modulus/slab hardness) of a flexural elastic modulus (MPa) thereof to a slab hardness (Shore D hardness) thereof in a range from 3 to 5, and containing, as a resin component, (A) a polyamide resin, (B) at least one selected from the group consisting of (b-1) a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, (b-2) a metal ion-neutralized product of a binary copolymer composed of an olefin and an a,6-unsaturated carboxylic acid having 3 to 8 carbon atoms, (b-3) a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and an α,β-unsaturated carboxylic acid ester, and (b-4) a metal ion-neutralized product of a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and an α,β-unsaturated carboxylic acid ester, and (C) a thermoplastic elastomer different from the (A) component and the (B) component.

8 . The golf ball according to claim 7 , wherein a ratio (slab hardness×flexural elastic modulus/content of (A) component) of a product obtained by multiplying the slab hardness (Shore D hardness) by the flexural elastic modulus (MPa) to a content (mass %) of the (A) component in the resin component of the golf ball resin composition is 1050 or less.

9 . The golf ball according to claim 7 , wherein the slab hardness of the golf ball resin composition ranges from 45 to 65 in Shore D hardness.

10 . The golf ball according to claim 7 , wherein the flexural elastic modulus of the golf ball resin composition ranges from 130 MPa to 400 MPa.

11 . The golf ball according to claim 7 , wherein a mass ratio ((A):(B):(C)) of the (A) component, the (B) component and the (C) component ranges from 10 to 60:5 to 80:5 to 50 (a total of the (A) component, the (B) component and the (C) component is set as 100).

12 . The golf ball according to claim 7 , wherein the (C) component contains a styrene-based thermoplastic elastomer.

13 . The golf ball according to claim 7 , wherein the intermediate layer is formed from the golf ball resin composition.

14 . The golf ball according to claim 13 , wherein the intermediate layer has a thickness in a range from 0.5 mm to 3.0 mm.

15 . The golf ball according to claim 7 , wherein the cover has a slab hardness in a range from 50 to 70 in Shore D hardness.

16 . The golf ball according to claim 7 , wherein the cover has a flexural elastic modulus in a range from 120 MPa to 450 MPa.

17 . The golf ball according to claim 7 , wherein the cover has a thickness in a range from 0.3 mm to 4.0 mm.

18 . The golf ball according to claim 13 , wherein a hardness difference (cover resin composition—intermediate layer resin composition) between a slab hardness of a cover resin composition for forming the cover and a slab hardness of an intermediate layer resin composition for forming the intermediate layer ranges from 0 to 15 in Shore D hardness.

19 . The golf ball according to claim 7 , wherein the ratio (flexural elastic modulus/slab hardness) ranges from 3 to 4.5.

20 . The golf ball according to claim 8 , wherein the ratio (slab hardness x flexural elastic modulus/content of (A) component) is 100 or more.

Assignees

• Dunlop Sports Co Ltd

Inventors

• Inoue Hidetaka
• Tarao Toshiyuki
• Tanaka Mami

Classifications

• C08L2207/04

  Thermoplastic elastomer · CPC title

• A63B37/0092

  Hardness distribution amongst different ball layers · CPC title

• A63B37/0062

  Hardness · CPC title

• A63B37/0051

  Materials other than polybutadienes; Constructional details · CPC title

• A63B37/0043

  Hardness · CPC title