METHOD FOR PRODUCTION OF TETRAFLUOROETHYLENE COPOLYMERS Russian patent published in 2005 - IPC

Abstract RU 2251554 C1

FIELD: polymers, in particular method for production of tetrafluoroethylene copolymers.

SUBSTANCE: tetrafluoroethylene copolymers with hexafluoropropylene and perfluoroalkylvinyl ester are obtained by copolymerization of said monomers in liquid medium in presence of radical initiator at elevated temperature and pressure. Charged monomer mixture contains (mol %): tetrafluoroethylene 18.75-54.5, hexafluoropropylene 17-66.75, and perfluoroalkylvinyl ester 7.8-28.5. Additional feeding is carried out by using monomer mixture containing (mol %): tetrafluoroethylene 76-90, hexafluoropropylene 5-12, and perfluoroalkylvinyl ester 5-12. Method of present invention makes it possible to inhibit copolymerization without losses of high efficiency and to produce copolymer with constant desired composition.

EFFECT: copolymer with increased elasticity, high resistance at elevated temperature and decreased reprocessing temperature.

3 cl, 10 ex, 2 tbl

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RU 2 251 554 C1

Authors

Loginova N.N.

Kochkina L.G.

Erokhova V.A.

Berezina G.G.

Dates

2005-05-10—Published

2003-10-22—Filed