Invention Grant
- Patent Title: Golf ball
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Application No.: US15842263Application Date: 2017-12-14
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Publication No.: US10456628B2Publication Date: 2019-10-29
- Inventor: Toshiyuki Tarao , Kazuya Kamino , Mami Tanaka , Hidetaka Inoue
- Applicant: Dunlop Sports Co. Ltd.
- Applicant Address: JP Kobe-Shi, Hyogo
- Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
- Current Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
- Current Assignee Address: JP Kobe-Shi, Hyogo
- Agency: Birch, Stewart, Kolasch & Birch LLP
- Priority: JP2016-253564 20161227
- Main IPC: A63B37/06
- IPC: A63B37/06 ; A63B37/00

Abstract:
An object of the present invention is to provide a golf ball having good spin performance on approach shots and good shot feeling as well as excellent stain resistance by precisely controlling physical properties of a paint film actually formed on a surface of a golf ball body. 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, wherein the paint film is such that a linear approximation curve obtained by a least square method has a slope in an absolute value ranging from 0.0001 to 0.0020 when a loss tangent tan δ thereof measured by a nanoindentation method is plotted as a vertical axis against a measuring frequency (Hz) as a horizontal axis, and that an elastic modulus thereof measured by a nanoindentation method ranges from 0.040 GPa to 0.600 GPa.
Public/Granted literature
- US20180178074A1 GOLF BALL Public/Granted day:2018-06-28
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