Golf ball

Patent metadata

Field	Value
Publication number	US-12109458-B2
Application number	US-202117471713-A
Country	US
Kind code	B2
Filing date	Sep 10, 2021
Priority date	Sep 11, 2020
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

An object of the present invention is to provide a golf ball having oily stain washability or weed juice stain resistance that is adjustable depending on a temperature. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and covering the golf ball body, wherein a molecular chain of a base resin constituting an outermost layer located at an outermost side of the paint film has a graft chain, and 80 mole % or more of repeating units constituting the graft chain includes any one of repeating units represented by formulae (1) to (4):[In the formulae (1) to (4), R1 to R5 each independently represent hydrogen, halogen or an organic group.].

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 covering the golf ball body, wherein
a molecular chain of a base resin constituting an outermost layer located at an outermost side of the paint film has a graft chain, and
80 mole % or more of repeating units constituting the graft chain includes any one of repeating units represented by formulae (1) to (4):

in the formulae (1) to (4), R 1 to R 5 each independently represent hydrogen, halogen or an organic group.

2. The golf ball according to claim 1 , wherein the graft chain has a cloud point ranging from 0° C. to 50° C.

3. The golf ball according to claim 1 , wherein a surface of the outermost paint film layer has a water contact angle of 50° or less at a temperature lower than a cloud point of the graft chain.

4. The golf ball according to claim 1 , wherein the base resin constituting the outermost paint film layer contains at least one member selected from the group consisting of a urethane resin, an ionomer resin, an epoxy resin, an acrylic resin, a vinyl acetate resin and a polyester resin.

5. The golf ball according to claim 1 , wherein the repeating unit represented by the formula (1) includes any one of repeating units represented by formulae (1-1) to (1-8):

the repeating unit represented by the formula (2) includes any one of repeating units represented by formulae (2-1) to (2-6):

the repeating unit represented by the formula (3) includes any one of repeating units represented by formulae (3-1) to (3-6):

and the repeating unit represented by the formula (4) includes any one of repeating units represented by formulae (4-1) to (4-3):

6. The golf ball according to claim 1 , wherein the graft chain is a homopolymer chain.

7. The golf ball according to claim 1 , wherein the graft chain includes a poly(N-isopropylacrylamide) chain, a poly(N-n-propylacrylamide) chain, a poly(N-n-butylacrylamide) chain, or a poly(N-t-butylacrylamide) chain.

8. The golf ball according to claim 1 , wherein an amount of the graft chain ranges from 0.001 g to 2 g per a golf ball.

9. The golf ball according to claim 1 , wherein the paint film is formed from a paint containing a polyol composition and a polyisocyanate composition.

10. The golf ball according to claim 9 , wherein the polyol composition contains a urethane polyol, and the urethane polyol includes a polyether diol having a number average molecular weight ranging from 600 to 3000 as a constituent component.

11. The golf ball according to claim 10 , wherein the polyisocyanate composition contains at least one member selected from the group consisting of a biuret-modified product of hexamethylene diisocyanate, an isocyanurate-modified product of hexamethylene diisocyanate, and an isocyanurate-modified product of isophorone diisocyanate.

12. The golf ball according to claim 9 , wherein the polyol composition contains a polyrotaxane having a cyclodextrin, a linear molecule piercing through the cyclic structure of the cyclodextrin, and blocking groups located at both terminals of the linear molecule to prevent disassociation of the cyclodextrin, wherein at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via a —O—C 3 H 6 —O— group.

13. The golf ball according to claim 12 , wherein the polyol composition optionally further contains a polycaprolactone polyol, and a mass ratio (polycaprolactone polyol/polyrotaxane) of the polycaprolactone polyol to the polyrotaxane ranges from 0/100 to 90/10.

14. The golf ball according to claim 12 , wherein the polyol composition further contains a hydroxy group modified vinyl chloride-vinyl acetate copolymer in an amount ranging from 4 mass % to 50 mass %.

15. The golf ball according to claim 12 , wherein the polyisocyanate composition contains an isocyanurate-modified product of hexamethylene diisocyanate and/or a biuret-modified product of hexamethylene diisocyanate.

Assignees

• Sumitomo Rubber Ind

Inventors

• Kaneko Takumi
• Shigemitsu Takahiro
• Shiga Kazuyoshi

Classifications

• C08G18/4854

  Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group · CPC title

• C08G18/6677

  having at least three hydroxy groups · CPC title

• C08G18/04

  with vinyl compounds · CPC title

• C08G18/12

  using two or more compounds having active hydrogen in the first polymerisation step · CPC title

• C08J7/18

  using wave energy or particle radiation · CPC title