Japan Synthetic Rubber Co., Ltd.

Konishiroku Photo Industry Co., Ltd.

Iwamoto Seisakusho Company Limited

Isao Furuta

Makoto Tomono

Takahira Kasuya

Goichi Yamakawa

Hideaki Morita

Minoru Tsuneyoshi

Fumio Tsutsumi

Yasuhiko Takemura

Toshio Miyabayashi

Shinichiro Zen

Yoshishige Chikatsu

Masato Sakai

Makoto Kondo

Isao Sugita

Shinsuke Iwamoto

Hironari Kuga

A rubber composition comprising 100 parts by weight of a rubber component which comprises at least 30% by weight of an emulsion polymerization rubber which is a conjugated diene polymer rubber or conjugated dienestyrene copolymer rubber obtained by emulsion polymerization, has a bound styrene content of 0-65% by weight, contains 20-35% by weight of a component having a molecular weight of not more than 150,000 as measured by a gel permeation chromatography and has a Mooney viscosity, ML.sub.1+4 (100.degree. C.), of 60-160 and a Mooney viscosity difference (.DELTA.MV) of -20 to +5 as defined by the following equation:

Process for preparing a rubber composition having two different

An electrostatic image developing toner comprises a binder resin which contains at least 60% by weight of a styrene-butadiene copolymer. The copolymer contains a component A having a molecular weight of at least 100,000 in an amount of at least 20% by weight relative to the binder resin, and a component B having a molecular weight of at least 500,000 in the component A is not more than 15% by weight relative to the binder resin. The toner has adequate flowability and noncoagulation property and is capable of forming a superior visible image in a contact heat fixing system.

Electrostatic image forming toner

A toner for developing an electrostatic latent image comprising a resin prepared by emulsion polymerization of a first polymer to yield a first emulsion, emulsion polymerization of a second polymer to yield a second emulsion, mixing said first and second emulsions and coagulating said mixture, wherein said second polymer has characteristics different from those of said first polymer.

Toner for developing of electrostatic latent image

A multi-component polymer rubber comprising (A) 15 to 60 mole % of an .alpha.,.beta.-unsaturated nitrile, (B) 10 to 75 mole % of a conjugated diene, and (C) 2 to 55 mole % of a fluoroalkyl acrylate or methacrylate or a fluorine-containing .alpha.-olefin, and having a glass transition temperature (T.sub.g) of -50.degree. C. to -20.degree. C., the percentages of the components (A), (B) and (C) being based on the total sum of moles of the components (A), (B) and (C). Said multi-component polymer rubber is excellent in sour gasoline resistance and alcohol-containing gasoline resistance.

Multi-component polymer rubber

An automatic tensile test apparatus includes an output device which supplies an elongation data of the specimen to the data processor in cooperation with means to optically detect said elongation, means to electrically detect said tension of said specimen and supply it to the data processor, and a device which detects the break of said specimen. Said output device generates a signal for causing the elongation strain and the tensile stress to be loaded into the data processor so as to correspond to each other. The break detector provides a break signal to the output device and the tension detecting means.

Automatic tensile test apparatus

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Suzuka, Japan

Isao Furuta