Golf ball
AssigneeSumitomo Rubber Industries, Ltd.
InventorsRyota Sakamine, Kazuyoshi Shiga, Hikaru Nagakura, Takahiro Shigemitsu
Life of this patent
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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.
Claims22
A golf ball comprising a spherical core having a diameter ranging from 38.8 mm to 42.2 mm 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,
- the cover is composed of at least two layers, and at least one layer of the cover other than an outermost cover is formed from a first cover resin composition,
- the first cover resin composition has a slab hardness of 60 or less in Shore D hardness, and contains (A) a thermoplastic resin, (B) an amphoteric surfactant, (C) a fatty acid, and (F) a filler,
- (A) the thermoplastic resin includes (A1) a metal ion neutralized product of a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or (A2) a metal ion neutralized product of a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and an α,β-unsaturated carboxylic acid ester, and
- (F) the filler includes (F1) an organically modified layered silicate.
A golf ball comprising a spherical core and a cover covering the spherical core having a diameter ranging from 38.8 mm to 42.2 mm, 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,
- the cover is composed of at least two layers, and at least one layer of the cover other than an outermost cover is formed from a first cover resin composition,
- the first cover resin composition has a bending stiffness in a range from 500 kgf/cm2 to 6000 kgf/cm2, and contains (A) a thermoplastic resin, (B) an amphoteric surfactant, (C) a fatty acid, and (F) a filler,
- (A) the thermoplastic resin includes (A1) a metal ion neutralized product of a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or (A2) a metal ion neutralized product of a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and an α,β3-unsaturated carboxylic acid ester, and
- (F) the filler includes (F1) an organically modified layered silicate.
Dependencies are inferred from the claim text.