Process for preparing elastomeric copolymers of vinylidene fluoride and the elastomeric copolymers obtained thereby

摘要

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 DEG C to =200 DEG C, preferably at 0 DEG C to 120 DEG 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.