E.i. Dupont De Nemours and Company

Nippon Mektron Limited

Sergey Vasilievich Sokolov

Igor Vladimirovich Kokotin

Haruyoshi Tatsu

Fumiyo Mizuide

Olga Viktorinovna Blagodatova

Michail Vasiliyevich Zhuravlev

Albertus VanCleeff

Galina Mikhailovna Tyul'ga

Lev Mikolayevich Senyushov

Nadyezhda Yegorovna Chulanova

Mikhail Vasilievich Zhuravlev

Valeriya Ivanovna Skoblikova

Yurii Kalmanovich Starobin

Olga Borisovna Platonova

Tatiana Ivanovna Rabtseva

Dimetrii Stefanovich Rondarev

Vitali Iraklievich Purtseladze

Irina Gennadievna Solodkaya

A carboxyl group-containing fluorine copolymer is produced safely at a low cost by treating a vinylidene fluoride copolymer with a base and a peroxide, preferably in the presence of a phase-transfer catalyst such as a quaternary ammonium salt or a quaternary phosphonium salt.

Process for producing carboxyl group-containing vinylidene fluoride copolymer

A fluorinated oligomer having COOH groups at both end and a &rgr;,value of 1,000 to 10,000 is produced by swelling a fluorine rubber crosslinking product in an organic solvent, followed by decomposition in the presence of a base and a peroxide. The obtained fluorinated oligomer is soluble in solvent and thus easy to separate from fillers, etc., and can be effectively used as a chain-elongating agent for epoxy resin, isocyanate resin, oxazoline resin, etc.

Process for producing fluorinated oligomer having COOH groups at both ends

Low molecular weight copolymers of vinylidene fluoride with fluorinated comonomers having ester functionality are curable at low temperatures to produce elastomers useful as components of heat and corrosion resistant sealants and protective coatings.

Low molecular weight vinylidene fluoride copolymers curable at room

Perfluoroalkylene oxide copolymer having acid fluoride moieties are prepared by reaction of hexafluoropropylene oxide and 1,2-epoxypentafluoropropane 3-fluorosulfate in the presence of a cesium alkoxide initiator. The copolymers may be cured at room temperature and are useful in sealant and coating formulations. Derivatives of the copolymers containing ester, amide, nitrile, and ether moieties are also disclosed.

Perfluoroalkylene oxide copolymer composition containing functional

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St. Petersburg, Russia

Sergey Vasilievich Sokolov