US 9,283,442 B2Granted

Golf ball

AssigneeDunlop Sports Co. Ltd.

InventorsAyaka Shindo, Chiemi Mikura, Shun Kurihara, Kazuhisa Fushihara

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Abstract

An object of the present invention is to provide a golf ball showing a great flight distance on driver shots. The present invention provides a golf ball comprising a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) base rubber, (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 branched carboxylic acid and/or a salt thereof, provided that the rubber composition further contains (e) a metal compound in case of containing only (b) the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.

Claims18

Dependent claims

A golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing:

(a) a base rubber,
(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,
(d) a branched carboxylic acid and/or a salt thereof that is a carboxylic acid having an alkyl branch at a carbon adjacent to the carboxylic acid group and/or a salt thereof, and
(f) an organic sulfur compound which is thiophenol or a derivative thereof, diphenyl disulfide or a derivative thereof, thionaphthol or a derivative thereof, thiuram disulfide or a derivative thereof, or a metal salt of these compounds,
provided that the rubber composition further contains (e) a metal compound if only (b) the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms is employed as the co-crosslinking agent, and
wherein (d) the branched carboxylic acid and/or the salt thereof is at least one selected from the group consisting of a branched carboxylic acid having 3 to 5 carbon atoms, a branched carboxylic acid having 10 to 30 carbon atoms, 2-ethyl butanoic acid (C6), 2-propyl pentanoic acid (C8) and salts thereof, and excludes (b) the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof.

4 more elements

A golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing:

(a) a base rubber,
(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,
(d) a branched carboxylic acid having 3 to 30 carbon atoms and/or a salt thereof, and
(f) an organic sulfur compound which is thiophenol or a derivative thereof, diphenyl disulfide or a derivative thereof, thionaphthol or a derivative thereof, thiuram disulfide or a derivative thereof, or a metal salt of these compounds,
provided that the rubber composition further contains (e) a metal compound if only (b) the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms is employed as the co-crosslinking agent, and
wherein (d) the branched carboxylic acid having 3 to 30 carbon atoms and/or the salt thereof is at least one selected from the group consisting of 2-ethyl-2,5-dimethylhexanoic acid (C10), 7,7-dimethyloctanoic acid (C10), 10-methyldodecanoic acid (C13), 11-methyldodecanoic acid (C13), 11-methyltridecanoic acid (C14), 12-methyltridecanoic acid (C14), 12-methyltetradecanoic acid (C15), 13-methyltetradecanoic acid (C15), 13-methylpentadecanoic acid (C16), 14-methylpentadecanoic acid (C16), 14-methylhexadecanoic acid (C17), 15-methylhexadecanoic acid (C17), 15-methylheptadecanoic acid (C18), 18-methylnonadecanoic acid (C20), 17-methylnonadecanoic acid (C20), 18-methylicosanoic acid (C21), 19-methylicosanoic acid (C21), 19-methylhenicosane acid (C22), 20-methylhenicosane acid (C22), 20-methyldocosanoic acid (C23), 21-methyldocosanoic acid (C23), 21-methyltricosanoic acid (C24), 22-methyltricosanoic acid (C24), 22-methyltetracosanoic acid (C25), 23-methyltetracosanoic acid (C25), 23-methylpentacosanoic acid (C26), 24-methylpentacosanoic acid (C26), 24-methylhexacosanoic acid (C27), 25-methylhexacosanoic acid (C27), 16-methylheptadecanoic acid (C18), 16-methyloctadecanoic acid (C19), 17-methyloctadecanoic acid (C19), 2,2,4,8,10,10-hexamethylundecane-5-carboxylic acid (C18) and salts thereof.

4 more elements

Dependencies are inferred from the claim text.