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AssigneeBridgestone Sports Co., Ltd.
InventorsHiroshi Higuchi, Nobuyuki Kataoka, Atsushi Nanba, Keiji Kobayashi, Manabu Hasegawa, Yoshinori Saito
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A zinc acrylate particle composition which is substantially fine and, even when kneaded with a rubber composition, is capable of being uniformly dispersed and kneaded in a state very rarely inducing fast adhesion or agglomeration, a method for the production thereof, and a golf ball using the composition are provided. The zinc acrylate particle composition contemplated by this invention comprises zinc acrylate satisfying the conditions that the proportion accounted for by the zinc acrylate particles measuring not less than 300 μm in particle size as determined by the dry type method be not more than 20% by mass of all the particles, that the median of particle sizes as determined by the dry type method be in the range of 10-300 μm, and that the ratio of the median (A) of particle sizes as determined by the dry type method to the median (B) of particle sizes as determined by the wet type method exceed 2, and an anionic surfactant.
A zinc acrylate particle composition comprising zinc acrylate satisfying the conditions that the proportion accounted for by the zinc acrylate particles measuring not less than 300 μm in particle size as determined by the dry type method be not more than 20% by mass of all the particles, that the median of particle sizes as determined by the dry type method be in the range of 10-300 μm, and that the ratio of the median (A) of particle sizes as determined by the dry type method to the median (B) of particle sizes as determined by the wet type method exceed 2, and an anionic surfactant.
A golf ball characterized which has as a component a heated molding of a rubber composition having incorporated in 100 parts by mass of a basic rubber using as a main material thereof 1,4-polybutadiene rubber containing not less than 40% of a cis form structure 10-60 parts by mass of a zinc acrylate particle composition of this invention as a co-cross-linking agent, 5-80 parts by mass of an inactive filler, and not more than 5 parts by mass of a cross-linking agent.
Dependencies are inferred from the claim text.