The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 1977
Filed:
Aug. 07, 1975
Ernesto Lo Valvo, Peschiera Borromeo, (Milan), IT;
Gianfranco Diotallevi, Milan, IT;
Carlo Lagana, Milan, IT;
Montedison S.p.A., Milan, IT;
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.