Golf ball

• US 9,168,423 B2
• Filed: 02/01/2013
• Issued: 10/27/2015
• Est. Priority Date: 02/03/2012
• Status: Active Grant

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Dunlop Sports Co. Ltd. (Sumitomo Rubber Industries Limited)
• Inventors: Tarao, Toshiyuki, Horiuchi, Kuniyasu
• Primary Examiner(s): BUTTNER, DAVID J
• Application Number:
  US13/756,725
• Publication Number:
  US 20130203524A1
• Time in Patent Office: 998 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: A63B 2225/02 Testing, calibrating or measuring of equipment
• CPC Class Codes: A63B 37/0003 Golf balls
• CPC Class Codes: A63B 37/0018 Specified number of dimples
• CPC Class Codes: A63B 37/00221 characterised by the material
• CPC Class Codes: A63B 37/00222 Physical properties, e.g. hardness
• CPC Class Codes: A63B 37/0031 Hardness
• CPC Class Codes: A63B 37/0096 Spin rate
• CPC Class Codes: A63B 45/00 Apparatus or methods for manufacturing balls working of plastics or substances in a plastic state B29
• CPC Class Codes: A63B 47/008 Devices for measuring or verifying ball characteristics
• CPC Class Codes: A63B 53/0445 Details of grooves or the like on the impact surface
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/6677 having at least three hydroxy groups
• CPC Class Codes: C08G 18/721 Two or more polyisocyanates not provided for in one single group C08G18/73 - C08G18/80
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: C09D 175/08 from polyethers

Abstract

An object of the present is to provide a golf ball having an increased spin rate on approach shots. Another object of the present invention is to provide a golf ball having a goof shot feeling on approach shots. The present invention provides a golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, and having a coefficient of friction calculated using a contact force tester of 0.35 or more and 0.60 or less.

Claims

1. A golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, and having a coefficient of friction calculated using a contact force tester of 0.35 or more and 0.60 or less, wherein

the paint film is formed from a base resin which is a polyurethane obtained by a reaction between a polyol and two or more polyisocyanates,

a molar ratio (NCO/OH) of the isocyanate groups (NCO) of the two or more polyisocyanates to the hydroxyl groups (OH) of the polyol is 0.1 or more and 0.9 or less in the reaction between the two or more polyisocyanates and the polyol,

the polyol includes a urethane polyol obtained by a reaction between a polyol component and a polyisocyanate component,

the polyol component constituting the urethane polyol includes a triol component and a diol component, and a mixing ratio (triol component/diol component) of the triol component to the diol component is 0.2 or more and 6.0 or less in mass ratio,

the two or more polyisocyanates include a derivative of hexamethylene diisocyanate and a derivative of isophorone diisocyanate,

a mixing ratio of the derivative of hexamethylene diisocyanate and the derivative of isophorone diisocyanate (HDI derivative /IPDI derivative) ranges from 80/20 to 50/50 in a mass ratio, and

the paint film has a thickness of 10 μ

m or more and less than 30 μ

m.

2. The golf ball according to claim 1, wherein the derivative of hexamethylene diisocyanate includes a biuret-modified product of hexamethylene diisocyanate and isocyanurate of hexamethylene diisocyanate.

3. The golf ball according to claim 1, wherein the derivative of isophorone diisocyanate includes isocyanurate of isophorone diisocyanate.

4. The golf ball according to claim 1, wherein the paint film has a 100% elastic modulus of 15 kgf/cm² or more and 240 kgf/cm² or less.

5. The golf ball according to claim 1, wherein the paint film has a 50% elastic modulus of 10 kgf/cm² or more and 180 kgf/cm² or less.

6. The golf ball according to claim 1, wherein the paint film has a 10% elastic modulus of 5 kgf/cm² or more and 160 kgf/cm² or less.

7. The golf ball according to claim 1, wherein the paint film has the coefficient of friction of 0.37 or more and 0.56 or less.

8. The golf ball according to claim 1, wherein the paint film has the coefficient of friction of 0.39 or more and 0.54 or less.

9. The golf ball according to claim 1, wherein the derivative of hexamethylene diisocyanate includes a biuret-modified product of hexamethylene diisocyanate and isocyanurate of hexamethylene diisocyanate, and the derivative of isophorone diisocyanate includes isocyanurate of isophorone diisocyanate.

10. The golf ball according to claim 1, wherein the molar ratio (NCO/OH) of the isocyanate groups (NCO) of the two or more polyisocyanates to the hydroxyl groups (OH) of the polyol is 0.1 or more and 0.8 or less.

11. The golf ball according to claim 9, wherein the molar ratio (NCO/OH) of the isocyanate groups (NCO) of the two or more polyisocyanates to the hydroxyl groups (OH) of the polyol is 0.1 or more and 0.8 or less.