Bridgestone Tire Company Limited

Toray Industries, Inc.

Nobuyuki Kataoka

Shiro Anzai

Ryota Fujio

Yoshihide Fukabori

Tasuku Saito

Chiaki Tanaka

Tsutomu Matsunaga

Nagayoshi Naito

Yoko Furuta

Takuya Takahashi

Fujio Ohkawa

Motozumi Kitayama

A solid type golf ball comprising a central core and an outer cover for the core and having an excellent flight performance and durability and acceptable 'click' characteristics is presented. The main component of the outer cover of this golf ball is a polyetherester block copolymer containing the following X, Y and Z units:

Golf ball

Novel abrasion resistant rubber compositions are disclosed. The compositions are prepared by curing the mixtures comprising a diene elastomer, an .alpha.,.beta.-ethylenically unsaturated carboxylic acid, a divalent metal compound, and an organic peroxide. When an unpolymerizable carboxylic acid is added to the mixture, the mechanical properties of the composition are improved. The addition of a carbon black to the mixtures brings about the improvement of weather-proofing property of the composition. The compositions are useful for the rubber stock of solid tires, snow removing plates and the like.

Abrasion resistant rubber compositions

One shot mouldable and curable homogeneous rubber composition consisting mainly of polyisoprene rubber and a monomer mixture composed of divinylbenzene and .alpha.-methylstyrene in specifically limited weight ratios of the rubber/the monomer mixture and of divinylbenzene/.alpha.-methylstyrene and containing small amounts of organic peroxide and at least one of amine compound and phenol compound. The cured product of the rubber composition has high Young's modulus, tear energy and tensile strength retention. More improved cured rubbers having these physical properties well balanced in a high level can be easily obtained by additionally adding a small amount of sulfur or p-quinonedioxime to the above rubber composition.

Rubber compositions of polyisoprene .alpha.-methylstyrene,

An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, and (d) 0.01-0.25 part by weight of sulfur, and the homogeneous rubber composition cured at 120.degree.-180.degree.C having a Young's modulus of 200-500 Kg/cm.sup.2, a tensile strength of at least 200 Kg/cm.sup.2, an elongation of at least 300%, a tear energy of at least 10 Kg/cm and retentions of Young's modulus and tensile strength at 70.degree.C of at least 50%.

Ethylene-propylene copolymer rubber composition having high modulus

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Hidakamachi, Japan

Nobuyuki Kataoka