Bridgestone Tire Company Limited

Sakae Inoue

Kazuo Naito

Tadashi Utsunomiya

Tsutomu Matsunaga

Kinji Masuda

Tasuku Saito

Shingo Kato

Shoson Shibata

Ryota Kajita

Suminobu Kurahashi

Yoshio Kaneko

Masayuki Ohtake

Toshiyuki Osaki

Tsuneharu Akiyama

Hideo Nakauchi

Toshio Nishi

Tsutomu Takada

Hideaki Saigo

A golf ball having a large carry having a core, a rubber thread layer and a cover layer, in which the rubber thread is composed of a rubber composition consisting essentially of 100 parts by weight of natural rubber and/or cis-1,4-polyisoprene and 2-20 parts by weight of carbon black.

Golf ball

Polyurethane products having improved flex crack resistance can be obtained by curing a mixture of (a) a polyurethane prepolymer having terminal isocyanate group and (b) at least one curative selected from polyamine and polyol to prepare a polyurethane product, and heat treating the polyurethane product at a temperature of 60.degree.-180.degree. C for 1-30,000 minutes under an atmosphere having an absolute humidity of at least 2%.

Method of producing polyurethane products having an improved flex crack

A heat resistant rubber laminate composed of a base layer consisting mainly of a heat resistant rubber composition and a heat resistant top cover consisting mainly of an ethylene-fluoropropylene copolymeric rubber.

Heat resistant rubber laminates

A butadiene-acrylonitrile copolymer rubber (NBR) composition can be strongly adhered to a metal material by compounding (A) a halogenated aromatic hydrocarbon having the general formula

Method for adhering a rubber composition to a metal material

A vulcanizable rubber composition suitable for the production of rubber materials having improved scorching stability and heat aging resistance can be obtained by compounding raw material rubber with a sulfenamide compound having the following general formula ##EQU1## wherein X represents a residue selected from the group consisting of residues of hydrocarbon, alkyl ether and secondary alcohol having 2-20 carbon atoms, and residues represented by the general formulae ##EQU2## (wherein R' represents a residue of hydrocarbon or alkyl ether having 0-20 carbon atoms, and R' represents a hydrocarbon residue having 1-10 carbon atoms), and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are same or different and are selected from hydrocarbon residues having 2-10 carbon atoms, and hydrogen atom, or R.sub.1 is ringed with R.sub.2 and/or R.sub.3 is ringed with R.sub.4, through the nitrogen atom of the general formula (1), to form heterocyclic rings of 5-7 members.

Sulfenamides in vulcanizable rubber composition

Urethane rubber composition having an improved cut-crack resistance and a high modulus is obtained by incorporating chopped organic fibers having a diameter of 1-50.mu. and an aspect ratio of 50-1,000 to urethane rubber.

Urethane rubber compositions reinforced with chopped organic fibers

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Kodaira, Japan

Sakae Inoue