Golf ball
AssigneeDunlop Sports Co. Ltd.
InventorsRyota Sakamine, Kazuyoshi Shiga, Hikaru Nagakura, Takahiro Shigemitsu
Life of this patent
Estimating the term…
Abstract
An object of the present invention is to provide a golf ball traveling a great flight distance. The present invention provides a golf ball comprising a spherical core and a cover covering the spherical core, wherein the golf ball has a ratio (t2/t1) of a time (t2) to a time (t1) of 1.05 or more in a hitting test using a driver (at a head speed of 40 m/sec), wherein the time (t1) is a time taken from a moment that the driver begins to contact with the golf ball to a moment that the golf ball reaches a maximum deformation amount, and the time (t2) is a time taken from the moment that the golf ball reaches the maximum deformation amount to a moment that the golf ball leaves the driver.
Claims20
A golf ball comprising a spherical core and a cover covering the spherical core, wherein
- the spherical core is formed from a rubber composition containing:
- (a) a base rubber,
- (b) a co-crosslinking agent which is an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof and which has a mode particle size of larger than 10 μm and 50 μm or less and includes particles having a particle size ranging from 6 μm to 300 μm in a volume ratio of 60% or more in a volume based particle size distribution graph, and
- (c) a crosslinking initiator, and
- the golf ball, upon being hit by a driver at a head speed of 40 m/sec in a hitting test, exhibits a ratio (t2/t1) of a time (t2) to a time (t1) of 1.05 or more, wherein the time (t1) is the amount of time from the moment that the driver begins to contact the golf ball to the moment that the golf ball reaches its maximum deformation amount, and the time (t2) is the amount of time from the moment that the golf ball reaches its maximum deformation amount to the moment that the golf ball leaves the driver.
Dependencies are inferred from the claim text.