Golf ball

Patent metadata

Field	Value
Publication number	US-11731006-B2
Application number	US-201916719349-A
Country	US
Kind code	B2
Filing date	Dec 18, 2019
Priority date	Dec 19, 2018
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

An object of the present invention is to provide a novel golf ball having excellent spin performance on approach shots. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein a base resin constituting an outermost layer of the paint film is a polyurethane obtained by a reaction between (A) a polyol composition and (B) a polyisocyanate composition, and a loss modulus (E″) at the temperature of −50° C. obtained by measuring a dynamic viscoelasticity of the polyurethane is 1.00×108 Pa or more.

First claim

The invention claimed is:

1. A golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein
a base resin constituting an outermost layer of the paint film is a polyurethane obtained by a reaction between (A) a polyol composition and (B) a polyisocyanate composition,
(A) the polyol composition contains a urethane polyol, the urethane polyol includes a polyether diol having a number average molecular weight in a range of from 800 to 3000 as a constituent component, and an amount of the polyether diol in the urethane polyol is 55 mass % or more and 65 mass % or less, and
a loss modulus (E″) at the temperature of −50° C. obtained by measuring a dynamic viscoelasticity of the polyurethane under following conditions is 1.00×10 8 Pa or more:
<measurement conditions>
measuring mode: sine wave tensile mode
measuring temperature range: −120° C. to 100° C.
temperature increasing rate: 3° C. /min
oscillation frequency: 10 Hz
measuring strain: 0.05%.

2. The golf ball according to claim 1 , wherein the loss modulus (E″) of the paint film is 1.20×10 8 Pa or more.

3. The golf ball according to claim 1 , wherein (B) the polyisocyanate composition contains an isocyanurate-modified product of a diisocyanate as a polyisocyanate component.

4. The golf ball according to claim 3 , wherein the diisocyanate is hexamethylene diisocyanate.

5. The golf ball according to claim 1 , wherein the loss modulus (E″) of the paint film is 1.00×10 9 Pa or less.

6. The golf ball according to claim 1 , wherein a 10% elastic modulus of the paint film is 130 kgf/cm 2 or less.

7. The golf ball according to claim 1 , wherein the polyether diol is polyoxytetramethylene glycol.

8. The golf ball according to claim 1 , wherein the urethane polyol further includes a triol as a constituent component, and a mixing ratio of the triol to the polyether diol (triol/polyether diol) ranges from 1.0 to 2.6 in a molar ratio of OH group.

9. The golf ball according to claim 8 , wherein the triol is trimethylolpropane.

10. The golf ball according to claim 1 , wherein
the urethane polyol has a number average molecular weight ranging from 5000 to 20000, and
the paint film is composed of at least two layers, and a base resin constituting a layer other than the outermost layer of the paint film includes at least one member selected from the group consisting of an epoxy resin, and an acrylic resin.

11. The golf ball according to claim 1 , wherein the urethane polyol has a hydroxyl value ranging from 10 mgKOH/g to 200 mgKOH/g.

12. The golf ball according to claim 1 , wherein a molar ratio (NCO group/OH group) of isocyanate groups (NCO groups) included in (B) the polyisocyanate composition to hydroxyl groups (OH groups) included in (A) the polyol composition ranges from 0.7 to 3.5.

13. The golf ball according to claim 1 , wherein (B) the polyisocyanate composition contains only one polyisocyanate selected from the group consisting of an isocyanurate-modified product of hexamethylene diisocyanate, a biuret-modified product of hexamethylene diisocyanate, an adduct product of hexamethylene diisocyanate, and an isocyanurate-modified product of isophorone diisocyanate, as a polyisocyanate component.

14. The golf ball according to claim 1 , a storage modulus (E′) at the temperature of 0° C. obtained by measuring a dynamic viscoelasticity of the polyurethane under following conditions is 0.5×10 8 Pa or more and 15×10 8 Pa or less:
<measurement conditions>
measuring mode: sine wave tensile mode
measuring temperature range: −120° C. to 100° C.
temperature increasing rate: 3° C. /min
oscillation frequency: 10 Hz
measuring strain: 0.05%.

15. The golf ball according to claim 1 , wherein (B) the polyisocyanate composition contains only an isocyanurate-modified product of hexamethylene diisocyanate as a polyisocyanate component.

16. A golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein
a base resin constituting an outermost layer of the paint film is a polyurethane obtained by a reaction between (A) a polyol composition and (B) a polyisocyanate composition,
a molar ratio (NCO group/OH group) of isocyanate groups (NCO groups) included in (B) the polyisocyanate composition to hydroxyl groups (OH groups) included in (A) the polyol composition ranges from 1.3 to 1.5,
a 10% elastic modulus of the outermost layer of the paint film is 2 kgf/cm 2 or more and 48 kgf/cm 2 or less, and
a loss modulus (E″) at the temperature of −50° C. obtained by measuring a dynamic viscoelasticity of the polyurethane under following conditions is 1.00×10 8 Pa or more:
<measurement conditions>
measuring mode: sine wave tensile mode
measuring temperature range: −120° C. to 100° C.
temperature increasing rate: 3° C. /min
oscillation frequency: 10 Hz
measuring strain: 0.05%.

17. The golf ball according to claim 16 , wherein the 10% elastic modulus of the outermost layer of the paint film is 30 kgf/cm 2 or less.

Assignees

• Sumitomo Rubber Ind

Inventors

• Naito Yasuo
• Oka Yuko
• Oyama Shimpei
• Abe Tetsuro
• Shiga Kazuyoshi

Classifications

• A63B37/0037 Primary

  Flexural modulus; Bending stiffness · CPC title

• A63B37/00221

  characterised by the material · CPC title

• A63B37/0024

  Materials other than ionomers or polyurethane · CPC title

• C09D175/08 Primary

  from polyethers · CPC title

• A63B37/0031

  Hardness · CPC title