Title:
ゴルフボール
Document Type and Number:
Japanese Patent JP5875299
Kind Code:
B2
Abstract:
A golf ball includes a spherical core and a cover covering the spherical core, wherein the cover is formed from a polyurethane composition containing a polyurethane elastomer as a resin component, the polyurethane composition has a shear loss modulus G″ of more than 5.03×106 Pa and 1.17×108 Pa or less when measured in a shear mode using a dynamic viscoelasticity measuring apparatus at the conditions of the temperature of 0° C., and the oscillation frequency of 10 Hz, the golf ball has a hardness distribution that R2 of a linear approximate curve determined by a least-squares method is 0.95 or more, when plotting center hardness (JIS-C) of the spherical core, hardness (JIS-C) measured at intervals of 2.5 mm from the center of the spherical core, surface hardness (JIS-C) of the spherical core, and slab hardness (JIS-C) of the cover versus distances from the center of the spherical core.
Inventors:
Toshiyuki Tarao
Chiemi Mikura
Kazuhisa Fushihara
Chiemi Mikura
Kazuhisa Fushihara
Application Number:
JP2011189297A
Publication Date:
March 02, 2016
Filing Date:
August 31, 2011
Export Citation:
Assignee:
Dunlop Sports Co., Ltd.
International Classes:
A63B37/00; A63B37/04; A63B37/12
Domestic Patent References:
| JP2011140618A | ||||
| JP2010269146A | ||||
| JP2008194473A | ||||
| JP2011125438A |
Foreign References:
| US5184828 |
Attorney, Agent or Firm:
Osamu Futakuchi