Japan Synthetic Rubber Co., Ltd.

Masato Sakai

Yasuhiko Takemura

Itsuki Umeda

Yasuo Takeuchi

Toshio Miyabayashi

Shinichiro Zen

Isao Furuta

Yoji Mori

Isao Sugita

A rubber composition obtained by subjecting a mixture of (I) 35-95 parts by weight of a fluoroelastomer, (II) 65-5 parts by weight of at least one member selected from the group consisting of polyethylene, ethylene-vinyl acetate copolymer and ethylene-unsaturated carboxylic acid ester copolymer, and an organic peroxide to reaction while imparting shearing deformation to the mixture. A crosslinkable rubber composition can be obtained by compounding the above rubber composition with a crosslinking agent for the fluoroelastomer (I). The above rubber composition is superior in processability, particularly extrusion-processability, sealing property, heat resistance, steam resistance and weather resistance.

Rubber composition and crosslinkable rubber composition

A rubber composition obtained by subjecting a mixture of (I) 35-95 parts by weight of a fluoroelastomer and (II) 65-5 parts by weight of an ethylene-.alpha.-olefin copolymer rubber in which the total of the (I) component and the (II) component is 100 parts by weight and a crosslinking agent for the ethylene-.alpha.-olefin copolymer rubber (II) to reaction while imparting shearing deformation to the mixture. Said rubber composition is excellent in processability on roll and in extruder, heat resistance, steam resistance, weather resistance, compression set and resistance to compressive load. A rubber article is obtained by subjecting the above rubber composition and a crosslinking agent for the fluoroelastomer (I) and optionally at least one additive to reaction, said rubber article being excellent in heat resistance, weather resistance, compression set and resistance to compressive load and hence can be used in the fields of general industry, electric industry and chemical industry.

Rubber composition derived from fluoroelastomer and

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

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Suzuka, Japan

Masato Sakai