Nippon Shokubai Co., Ltd.

Bridgestone Sports Co., Ltd.

Nihon Joryu Kogyo Co., Ltd.

Nippon Shokubai Kagaku Kogyo Co., Ltd.

Nihon Joyu Kogyo Co., Ltd.

Keiji Kobayashi

Yoshinori Saito

Hiroshi Higuchi

Atsushi Nanba

Manabu Hasegawa

Nobuyuki Kataoka

Naoji Kurata

Yoshio Sugita

Minoru Saotome

Yukihisa Kodama

Atsushi Kawano

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 &#x3bc;m 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 &#x3bc;m, 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.

Zinc acrylate particle composition, method for production thereof, and golf ball using the composition

A method is provided for the production of zinc acrylate which possesses an essentially fine constitution, permits easy pulverization into a fine powder, and, when kneaded with a rubber composition, attains uniform diffusion in a state very rarely inducing fast adhesion or formation of cluster. The fine zinc acrylate powder is obtained by a method which comprises causing acrylic acid and a higher fatty acid of 12-30 carbon atoms to react with zinc oxide in an organic solvent while continuing dispersion of the zinc oxide in the organic solvent in the presence of an anionic surfactant.

Method for production of zinc acrylate

A polyoxyalkylene carbazole adduct represented by the following formula I: ##STR1## wherein R stands for at least one member selected from the group consisting of H, CH.sub.3 and C.sub.6 H.sub.5, R' for at least one member selected from the group consisting of CH.sub.3, C.sub.6 H.sub.5 and H, (providing that R' is at least one member selected from the group consisting of CH.sub.3 and C.sub.6 H.sub.5 when R is H, and R is at least one member selected from the group consisting of CH.sub.3 and C.sub.6 H.sub.5 when R' is H), n for an integer of the value of 0 to 500, m for an integer of the value of 0 to 500, and n+m for an integer of the value of 2 to 1000.

Polyoxyalkylene carbozole adduct

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Funabashi, Japan

Keiji Kobayashi