The Furukawa Electric Co., Ltd.

Hiroki Chiba

Masaki Nishiguchi

Arifumi Matsumura

A method of producing a heat-resistant crosslinked fluororubber formed body, including: step (1) melt-mixing, with respect to 100 mass parts of base rubber containing 60 to 99 mass % of fluororubber and 1 to 40 mass % of ethylene-based copolymer resin modified with unsaturated carboxylic acid, 0.003 to 0.5 mass parts of organic peroxide, 0.5 to 400 mass parts of inorganic filler, 2 to 15 mass parts of silane coupling agent, and silanol condensation catalyst, in which the step (1) includes, step (a) melt-mixing all or part of the base rubber, the organic peroxide, the inorganic filler and the silane coupling agent at a temperature equal to or higher than a decomposition temperature of the organic peroxide, and step (b) melt-mixing a remainder of the base rubber, and the silanol condensation catalyst, to melt-mix the thus-modified ethylene-based copolymer resin in at least one of the steps (a) and (b).

Heat-resistant crosslinked fluororubber formed body and method of producing the same, silane masterbatch, masterbatch mixture, and heat-resistant product

A method of producing a heat-resistant crosslinked fluororubber formed body, including a step (1) of melt-mixing, with respect to 100 mass parts of base rubber containing 40 to 98 mass % of fluororubber and 2 to 40 mass % of ethylene/tetrafluoroethylene copolymer resin, 0.003 to 0.5 mass parts of organic peroxide, 0.5 to 400 mass parts of inorganic filler, 2 to 15 mass parts of a specific silane coupling agent, and silanol condensation catalyst, and including a step (a) of melt-mixing a part of the base rubber, the organic peroxide, the inorganic filler and the silane coupling agent at a temperature equal to or higher than a decomposition temperature of said organic peroxide, and a step (b) of melt-mixing a remainder of the base rubber, and the silanol condensation catalyst, and the fluororubber and the ethylene/tetrafluoroethylene copolymer resin are melt-mixed in any of the steps (a) and (b).

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Tokyo, Japan

Hiroki Chiba