Process for preparing elastomeric copolymers of vinylidene fluor

Details Process for preparing elastomeric copolymers of vinylidene fluor Process for preparing elastomeric copolymers of vinylidene fluor

1975-08-07

1977-05-31

Wong, Jr., Harry

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

260 312R, 260 326R, 260328R, 260 47UP, 260 795R, 260 795D, 526 27, 526 49, 526253, 526254, C08F21422

Patent

active

040270866

ABSTRACT:
A process for preparing new elastomeric copolymers of vinylidene fluoride having exceptionally valuable properties is disclosed. Monomeric mixtures containing vinylidene fluoride in such quantities as to yield elastomeric products are polymerized in solution, emulsion or suspension, or in the absence of solvents and/or dispersants (mass or bulk) in the presence of radical polymerization initiators, at temperatures of -30.degree. C to =200.degree. C, preferably at 0.degree. C to 120.degree. C, and at a pressure of from autonomous pressure to 300 atmospheres. In this process, vinylidene fluoride is fed into the reaction mixture during the polymerization and in a quantity such that the ratio between the added vinylidene fluoride and the vinylidene fluoride of the monomeric mixture subjected to polymerization varies between 0.1 and 1.5.
The products referred to herein as "elastomeric copolymers of vinylidene fluoride" are copolymers, terpolymers or tetrapolymers of vinylidene fluoride with hexafluoroprene, and/or 1-, and/or 2-hydrofluoroprene, with or without tetrafluoroethylene.

REFERENCES:
patent: 3622549 (1971-11-01), Keller
patent: 3845024 (1974-10-01), Weaver
patent: 3876654 (1975-04-01), Pattison

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