Rubber composition for golf ball, and golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorJun Shindo
Life of this patent
Estimating the term…
Abstract
The present invention provides the rubber composition for a golf ball comprising (a) a base rubber, (b) a co-crosslinking agent which is an α,β-unsaturated carboxylic acid or a metal salt thereof or both, (c) a crosslinking initiator, and (d) an alcohol, wherein the amount of component (d) is from 0.1 to 10 parts by weight per 100 parts by weight of the base rubber (a) and the compounding ratio between component (b) and component (c) is set to at least 60 of E value that is represented by “E=the molar amount of component (b)/the molar amount of the active oxygen of component (c), and a golf ball using the rubber composition, in order to achieve the object that good durability of the golf ball to impact is maintained.
Claims16
A golf ball comprising a core and a cover of one or more layers encasing the core, wherein the core is formed of the rubber composition, comprising:
- (a) a base rubber,
- (b) zinc diacrylate (ZDA) as a co-crosslinking agent,
- (c) a crosslinking initiator, and
- (d) an alcohol,
- wherein the amount of component (d) is from 0.1 to 10 parts by weight per 100 parts by weight of the base rubber (a) and the compounding ratio between component (b) and component (c) is set to at least 60 of E value that is represented by “E=the molar amount of component (b)/the molar amount of the active oxygen of component (c)”, the core includes grafted polymers of BR-ZDA in which ZDA nanoparticles agglomerate to become secondary particles and further the secondary particles are connected mutually such that a network structure is formed, and the core has a hardness profile in which a surface and a center of the core have a hardness difference therebetween of at least 16 on the JIS-C hardness scale.
Dependencies are inferred from the claim text.