Asahi Glass Company, Limited

Dai Nippon Toryo Co., Ltd.

Masaaki Yamabe

Seiji Munekata

Hiroshi Ukihashi

Seisaku Kumai

Haruhisa Miyake

Gen Kojima

Tatsuro Asawa

Shunichi Samejima

Shun-ichi Kodama

Isamu Kaneko

Hiroshi Wachi

Toshio Shinohara

Hiroyuki Tanabe

Hiromichi Higaki

Shunsuke Nakayama

Masao Kato

Katsuyuki Akiyama

Masaru Nakamura

Yoshio Oda

Tomoki Gunjima

Yoshio Sugaya

Teruo Takakura

Noriyuki Yoshihara

Kiyotaka Arai

Seitoku Kaya

Shigeyoshi Kobayashi

Yukio Jitsugiri

Makoto Noshiro

Hiroaki Kojima

A fluorine-containing elastomer having excellent low temperature resistance and oil resistance comprises ethylene units (E) and fluorovinyl ether units (FV) having the formula CF.sub.2 .dbd.CFOX (X represents a C.sub.1 -C.sub.9 perfluoroalkyl group which can have one or more ether bond) at a molar ratio of (E) to (FV) of 95:5 to 30:70 and at a total content of (E) and (FV) of at least 70 mole %.

Fluorine-containing elastomer having excellent low temperature

A composite membrane for gas separation having a three-layered structure comprising:

Composite membrane for gas separation

A copolymer for an fluorine-containing elastomer having excellent low temperature resistance and alcohol resistance comprises vinylidene fluoride units and fluorovinyl ether units having the formula CF.sub.2 =CFOX (X represents a C.sub.3 -C.sub.9 perfluoroalkyl group which has ether bond having 1-3 oxygen atom) at a molar ratio of vinylidene fluoride units to fluorovinyl ether units of 95:5 to 50:50 and at a total content of the units of at least 80 mole %.

Copolymer for fluorine-containing elastomer having excellent low

A fluorinated cation exchange membrane is formed using a copolymer of a fluorovinyl ether (I) having the formula

Fluorinated cation exchange membrane and use thereof in electrolysis of

A fluorinated acid fluoride having an ester group which has the formula ##STR1## wherein A,p, q and R are defined below is produced by reacting a diacid fluoride having the formula ##STR2## wherein A represents a C.sub.1 -C.sub.10 bifunctional perfluoro group; p represents 0 or 1; q represents an integer of 1 to 8 with an alcohol having the formula ROH wherein R represents an organic group.

Process for producing fluorinated acid fluoride having ester group

A process for producing a carboxyl group-containing fluoropolymer comprises reacting a hydroxyl group-containing fluoropolymer in an organic solvent with a dibasic acid anhydride represented by the general formula ##STR1## where R represents a bifunctional organic group, to convert at least a part of hydroxyl groups into ester groups represented by the general formula ##STR2## where R is as defined above.

Process for producing carboxyl group-containing fluoropolymer

A permselective element for gas separation comprises a permselective layer composed of an organic polymer having -OCOC(CH.sub.3).sub.3 groups in its side chains. The permselective element is useful for the separation of oxygen/nitrogen.

Permselective element for gas separation

An anticorrosive coating process comprises:

Anticorrosive coating process

A copolymer for a fluorine-containing elastomer having excellent low temperature resistance and alcohol resistance comprises vinylidene fluoride units and fluorovinyl ether units having the formula CF.sub.2 =CFOX (X represents a C.sub.3 -C.sub.9 perfluoroalkyl group which has ether bond having 1-3 oxygen atom) at a molar ratio of vinylidene fluoride units to fluorovinyl ether units of 95:5 to 50:50 and at a total content of the units of at least 80 mole %.

An antithrombogenic material is composed of a fluorine-containing block polymer obtained by the polyaddition or polycondensation of a prepolymer with a chain extender, said prepolymer being a diisocyanate prepolymer represented by the formula

Antithrombogenic polyurethanes based on fluorinated prepolymers

Perfluorosuccinyl fluoride is produced by coupling accompanied by dehalogenation of a difluorohaloacetyl fluoride having the formula

Process for producing perfluorosuccinyl fluoride

A difluorohaloacetyl fluoride is produced by (a) producing an intermediate having a group of the formula

Process for producing difluorohaloacetyl fluoride

A curable fluorocopolymer comprises 40 to 60 mol % of fluoroolefin units, 5 to 45 mol % of cyclohexyl vinyl ether units, 5 to 45 mol % of alkyl vinyl ether units and 3 to 15 mol % of hydroxyalkyl vinyl ether units and has an inherent viscosity of 0.05 to 2.0 dl/g. in tetrahydrofuran at 30.degree. C.

Growing community of inventors

Machida, Japan

Masaaki Yamabe