Patent ID: 9283442
Filing Date: 2016-03-15
CPC Classification: A63B,C08K

Claim Text:
1. 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.