Daikin Industries, Ltd.

Tetsuya Higuchi

Satoshi Komatsu

Satoshi Koyama

Hideya Saito

Shigeru Ichiba

Mikio Morita

Akira Watanabe

Masaomi Goromaru

Hiroshi Yamaguchi

Shunichi Nomura

Kazuhiro Takeda

Kazuhisa Fujita

Yasuyuki Moriyama

Yutaka Ueta

Satoshi Tokuno

Akihiro Nakashima

A vulcanizable fluorine-containing elastomer composition having excellent stability in molding and kneading property, from which a vulcanized article having a small compression set can be produced in a short period of time. The vulcanizable fluorine-containing elastomer composition comprises a vulcanization agent, a vulcanization aid and a fluorine-containing elastomer having C&#x2014;H bond in its polymer chain, and an optimum vulcanization time T(min) of the composition and a compression set CS (%) of the vulcanized article satisfy the following equations (I) and (II):

Vulcanizable flouroelastomer composition

A process for preparing a fluorine-containing elastomeric copolymer, a vulcanizing agent and a vulcanization accelerator, said process comprising the step of coagulating the copolymer from an aqueous dispersion of the fluorine-containing elastomeric copolymer and drying the resulting coagulate of the copolymer while kneading, wherein a mixture of mutually soluble components consisting of the vulcanizing agent and the vulcanization accelerator is added to the coagulate, can give a fluororubber composition having stable vulcanization physical properties, wherein the vulcanizing agent and the vulcanization accelerator are homogeneously dispersed in the fluororubber.

Process for producing elastic fluorocopolymer composition

A process for preparing a fluoropolymer by polymerizing one or more radically polymerizable monomers comprising at least one fluoroolefin monomer in the presence of a radical polymerization initiator and as case demands, an inactive fluorocarbon and chain transfer agent in a reaction field where at least one of components forming the reaction field is in a supercritical state. According to the preparation process, generation of unstable end groups of the polymer, a decrease in a purity and complicated post-treatment can be eliminated.

Process for producing fluoropolymer

A process for continuously preparing a wet powder of PTFE, comprising the step of continuously slurrying a PTFE aqueous dispersion with a high shear machine having a rotating element, and the step of continuously granulating the slurry by using vertical agitator. The process can be carried out for a long time without trouble, and can continuously provide a dry powder having good powder properties. The powder properties can be controlled by regulating operation conditions.

Continuous process for preparing polytetrafluoroethylene wet powder

A process for continuously preparing a wet powder of PTFE, comprising the step of continuously slurrying a PTFE aqueous dispersion with a high shear machine, and the step of continuously granulating the slurry by using vertical agitator. The process can be carried out for a long time without trouble, and can continuously provide a dry powder having good powder properties. The powder properties can be controlled by regulating operation conditions.

Continunous process for preparing polytetrafluoroethlene wet powder

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Settsu, Japan

Tetsuya Higuchi