Golf ball

Patent metadata

Field	Value
Publication number	US-2016136484-A1
Application number	US-201514941315-A
Country	US
Kind code	A1
Filing date	Nov 13, 2015
Priority date	Nov 14, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

An object of the present invention is to provide a golf ball showing increased controllability on approach shots for less than 40 yards and showing excellent shot feeling. In the inventive golf ball, the paint film is formed from a curing type paint composition including: a base material containing a polyrotaxane, and a curing agent containing a polyisocyanate, and wherein the polyrotaxane has a cyclodextrin, a linear molecule included in a cyclic structure of the cyclodextrin in a manner of piercing through the cyclic structure of the cyclodextrin, and a blocking group located at both ends of the linear molecule to prevent disassociation of the cyclodextrin, and at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via —O—C 3 H 6 —O— group.

First claim

1 . A golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body,
wherein the paint film is formed from a curing type paint composition including: a base material containing a polyrotaxane, and a curing agent containing a polyisocyanate, and wherein the polyrotaxane has a cyclodextrin, a linear molecule included in a cyclic structure of the cyclodextrin in a manner of piercing through the cyclic structure of the cyclodextrin, and having blocking groups located at both ends of the linear molecule to prevent disassociation of the cyclodextrin, and at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via —O—C 3 H 6 —O— group.

2 . The golf ball according to claim 1 , wherein the linear molecule is polyethylene glycol, and the blocking group is an adamantyl group.

3 . The golf ball according to claim 1 , wherein the base material further contains at least one polyol selected from the group consisting of a polyether polyol, a polyester polyol, a polycaprolactone polyol, a polycarbonate polyol, and an acrylic polyol.

4 . The golf ball according to claim 1 , wherein a resin component of the base material contains the polyrotaxane in an amount of 10 mass % or more and 100 mass % or less.

5 . The golf ball according to claim 3 , wherein a resin component of the base material contains the polyol in an amount of 5 mass % or more and 90 mass % or less.

6 . The golf ball according to claim 1 , wherein the curing type paint composition further includes a vinyl chloride-vinyl acetate copolymer and/or a modified product thereof.

7 . The golf ball according to claim 1 , wherein the curing type paint composition further includes a modified silicone.

8 . The golf ball according to claim 7 , wherein the modified silicone is included in an amount of 0.01 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of a resin component of the base material.

9 . The golf ball according to claim 1 , wherein the polyisocyanate includes an isocyanurate-modified product of hexamethylene diisocyanate.

10 . The golf ball according to claim 1 , wherein the cyclodextrin is α-cyclodextrin.

11 . The golf ball according to claim 1 , wherein the linear molecule has a weight average molecular weight ranging from 5,000 to 100,000.

12 . The golf ball according to claim 1 , wherein a ratio of the hydroxyl groups modified with the caprolactone chain to all the hydroxyl groups included in the cyclodextrin before the modification is 2 mole % or more.

13 . The golf ball according to claim 1 , wherein the polyrotaxane has a hydroxyl value ranging from 10 mg KOH/g to 400 mg KOH/g.

14 . The golf ball according to claim 1 , wherein the polyrotaxane has a weight average molecular weight ranging from 30,000 to 3,000,000.

15 . The golf ball according to claim 6 , wherein the vinyl chloride-vinyl acetate copolymer and/or the modified product thereof includes a hydroxyl group-modified vinyl chloride-vinyl acetate copolymer.

16 . The golf ball according to claim 6 , wherein the vinyl chloride-vinyl acetate copolymer and/or the modified product thereof is included in an amount of 4 mass % or more and 50 mass % or less in a resin component of the base material.

17 . The golf ball according to claim 7 , wherein the modified silicone includes a polydimethylsiloxane-polycaprolactone block copolymer.

18 . The golf ball according to claim 1 , wherein the paint film has a 10% elastic modulus of 160 kgf/cm 2 or less.

19 . The golf ball according to claim 1 , wherein the golf ball body comprises a core and a cover covering the core, and the cover has a slab hardness of 70 or less in Shore D hardness.

20 . The golf ball according to claim 1 , wherein the golf ball has a coefficient of friction (dry) ranging from 0.48 to 0.60, and a coefficient of friction (wet paper slit) of 0.18 or more.

Assignees

• Dunlop Sports Co Ltd

Inventors

• Inoue Hidetaka
• Tarao Toshiyuki
• Horiuchi Kuniyasu

Classifications

• A63B37/0031

  Hardness · CPC title

• A63B37/0074

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

• A63B37/0089

  Coefficient of drag · CPC title

• A63B37/0022 Primary

  Coatings, e.g. paint films; Markings · CPC title

• C08G18/4883 Primary

  containing cyclic groups having at least one oxygen atom in the ring · CPC title