Golf ball
AssigneeSumitomo Rubber Industries, Ltd.
InventorsHironori Takihara, Hikaru Nagakura, Kai Hayashi
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 and having a good shot feeling and durability on driver shots. The present invention provides a golf ball comprising a core, at least one intermediate layer covering the core and a cover covering the intermediate layer, wherein the core is formed from a core rubber composition containing (a) a base rubber containing a polybutadiene, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a terpene-based resin, and a material hardness (Hm) of the intermediate layer and a material hardness (Hc) of the cover satisfy an equation of Hm≤Hc.
Claims14
A golf ball comprising a core, at least one intermediate layer covering the core and a cover covering the intermediate layer, wherein the core is formed from a core rubber composition containing (a) a base rubber containing a polybutadiene, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a terpene-based resin, and a material hardness (Hm) of the intermediate layer and a material hardness (Hc) of the cover satisfy an equation of Hm≤Hc.
A golf ball comprising a core, at least one intermediate layer covering the core and a cover covering the intermediate layer, wherein the core is formed from a core rubber composition containing (a) a base rubber containing a polybutadiene, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a terpene-based resin, and a material hardness (Hm) of the intermediate layer and a material hardness (Hc) of the cover satisfy an equation of Hm≤Hc,
- the core rubber composition contains (d) the terpene-based resin in an amount of from 0.5 part by mass to 10 parts by mass with respect to 100 parts by mass of (a) the base rubber, and
- (d) the terpene-based resin is at least one member selected from the group consisting of an α-pinene-phenol copolymer, an α-pinene-α-methylstyrene copolymer, an α-pinene-α-methylstyrene-phenol copolymer, a β-pinene-phenol copolymer, a β-pinene-α-methylstyrene copolymer, and a β-pinene-α-methylstyrene-phenol copolymer.
Dependencies are inferred from the claim text.