Fluorine-containing copolymer and composition containing the same
AssigneeNippon Mektron, Ltd.
InventorsYuichi Yamamoto, Haruyoshi Tatsu
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Abstract
A fluorine-containing-copolymer composition comprises a novel terpolymer of tetrafluoroethylene-perfluoro (methylvinylether)-1,1,3,3,3-pentafluoropropene and dialkali metal salt of bisphenol compound gives a vulcanization product having a low compression set.
Drawings
Claims4
A fluorine-containing copolymer composition, which comprises a tetrafluoroethylene-perfluoro(methylvinylether)-1,1,3,3,3-pentafluoroprope ne terpolymer comprising 45 to 80% by mole of tetrafluoroethylene, 20 to 50% by mole of perfluoro(methylvinylether) and 0.1 to 0.5% by mole of 1,1,3,3,3-pentafluoropropene, and dialkali metal salt of a bisphenol compound.
6 Oct 2014Estimated · howhidePre-1995 term; greater of 17 years from grant or 20 years from filing when eligible. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.
#The present invention relates to a fluorine-containing copolymer and a composition containing tha same, and more particularly to a novel fluorine-containing copolymer and a composition containing the same, the, composition being capable of producing a vulcanization product having a low compression set.
#Copolymerization of tetrafluoroethylene, perfluoro(methylvinylether)-1,1,3,3,3-pentafluoropropene can be carried out according to any desired polymerization procedure, for example, by emulsion polymerization, suspension polymerization, bulk polymerization, etc. From the viewpoint of economy, an emulsion polymerization procedure is preferable. The emulsion polymerization reaction can be carried out usually at a temperature of about 40.degree. C. to about 85.degree. C. under a pressure of about 3 to about 8MPa, using a water-soluble inoganic peroxide or its redox system as a catalyst and using a surfactant such as ammonium perfluorooctanoate, etc.
#The terpolymer can be further copolymerized with other vinyl monomer or olefin monomer such as vinyl fluoride, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, perfluoro(alkyleneoxyalkylvinylether), alkylvinyl ether, vinyl acetate, vinyl chloride, ethylene, propylene, etc. in such an amount as not to disturb the objects of the present invention, usually in an amount of not more than about 20% by mole, preferably not more than about 10% by mole, on the basis of the terpolymer.
#The present terpolymer usually has such a viscosity characteristic as an intrinsic viscosity .eta.sp/c of about 0.5 to about 5 dl/g, measured in Florinat FC-77 (an inert liquid containing perfluoro(2-butyltetrahydrofuran) as the main component, a product made by Sumitomo 3M K.K., Japan) at 35.degree. C. and comprises about 45 to about 80% by mole, preferably about 47 to about 65% by mole, of tetrafluoroethylene, about 20 to about 50% by mole, preferably about 35 to about 50% by mole, of perfluoro(methylvinylether) and about 0.1 to about 5% by mole, preferably about 0.1 to about 3% by mole, of pentafluoropropene, determined by .sup.19 F NMR and infrared absorption spectra, and can be subjected to vulcanization with dialkali metal salt of bisphenol compound.