Daikin Industries, Ltd.

Hideya Saito

Mitsuru Kishine

Masanori Kitaichi

Yoshiki Shimizu

Haruhiko Mohri

Mitsuo Tsukamoto

Satoshi Koyama

Yutaka Ueta

Tatsuya Morikawa

Satoshi Komatsu

Masahiko Oka

Akira Chida

Masuo Kokumai

Tetsuya Higuchi

Mitsuhiro Otani

Masao Otsuka

Susumu Wada

Satoshi Tokuno

Sadashige Irie

Hiroshi Aihara

Katsuhide Otani

Yasuji Iwasaki

Yoshiki Maruya

The present invention provides an ethylene-hexafluoropropylene copolymer which is suitable as a hose or seal for engine oil of an automobile and has sufficient amine resistance, while maintaining heat resistance, oil resistance and chemical resistance close to that of conventional fluorine rubber. The ethylene-hexafluoropropylene copolymer comprises 35 to 60% by mole of ethylene structural unit, 25 to 50% by mole of hexafluoropropylene structural unit and 0 to 15% by mole of structural unit derived from a monomer copolymerizable therewith and has a fluorine content of at least 60% by weight and number average molecular weight of 3,000 to 500,000.

Ethylene-hexafluoropropylene copolymer elastomer

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

The present invention relates to a process for preparing an elastomeric ethylene-hexafluoropropylene copolymer with excellent vulcanization properties, which comprises emulsion polymerizing ethylene, hexafluoropropylene and when in demand, a monomer copolymerizable therewith in a aqueous medium at a low temperature of &#x2212;20&#xb0; C. to 40&#xb0; C. using a radical polymerization initiator.

Process for preparing elastomeric ethylene-hexafluoropropylene copolymer

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 preparing a fluorine-containing polymer through emulsion polymerization method which enhances productivity while maintaining excellent physical properties of the fluorine-containing polymer and comprises (a) a first polymerization step for emulsion-polymerizing a fluorine-containing monomer or a mixture of a fluorine-containing monomer and a non-fluorine-containing monomer in an aqueous medium in the presence of a radical polymerization initiator and an emulsifying agent, (b) a dilution step for diluting the obtained aqueous emulsion of polymer particles with water to reduce the number of emulsified polymer particles per unit amount of aqueous medium in the emulsion and a concentration of emulsifying agent, and (c) a second polymerization step for emulsion-polymerizing a fluorine-containing monomer and/or a non-fluorine-containing monomer in the obtained diluted emulsified solution.

Process for preparing fluorine-containing polymer

Fluorine-containing elastic copolymers, curable composition containing

Fluororubber copolymer and curable composition thereof

Fluorovinyl ether

A fluorine-containing copolymer comprising 20 to 60% by mole of the fluoroolefin unit (1), 5 to 45% by mole of the .beta.-methyl substituted .alpha.-olefin unit (2), 1 to 45% by mole of the unit (3) derived from a monomer having a chemically curable functional group, 1 to 45% by mole of the unit (4) derived from a monomer having ester moieties in the side chains and 0 to 45% by mole of the unit (5) derived from a copolymerizable monomer other than the above monomers, if necessary, 0.1 to 15% by mole of the unit (6) derived from a monomer having carboxyl groups. The copolymer can provide a curable composition alone or with an acrylic polymer. The fluorine-containing copolymer is excellent in solvent-solubility, compatibility with curing agents, additives and other polymers, pigment dispersibility, curing reactivity, dispersibility to water, pot life, film forming ability, coating properties, and the like. The coating film prepared from the copolymer has a high weatherability and is excellent in film properties such as stain resistance, heat-yellowing resistance, dechlorination resistance, optical properties, adhesion to a substrate, mechanical properties, heat resistance, chemical resistance, solvent (gasoline) resistance, water resistance and good appearance of finished products.

Fluorine-containing copolymer and curable composition containing the same

A fluorine-containing copolymer comprising: 30 to 85% by mole of structural units (a): ##STR1## 1 to 30% by mole of structural units (b): ##STR2## and 3 to 60% by mole of structural units (c): ##STR3## and a curable composition containing the same. The copolymer is excellent in compatibility with curing agents and the obtained film therefrom is excellent in appearance, gloss, durability, and the like.

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Settsu, Japan

Hideya Saito