Fluorine-containing elastomeric copolymers, process for preparin

Details Fluorine-containing elastomeric copolymers, process for preparin Fluorine-containing elastomeric copolymers, process for preparin

1976-11-10

1979-02-27

Taylor, Hosea E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260884, 260900, 526255, C08L 2716

Patent

active

041418743

ABSTRACT:
Elastomeric copolymer of vinylidene fluoride and at least one other fluorine-containing monomer containing 28 to 92% by mole of the vinylidene fluoride unit and having an intrinsic viscosity of 0.4 to 1.3 at 35.degree. C. in methyl ethyl ketone, which is prepared by a two-stage polymerization process of vinylidene fluoride monomer and at least one other fluorine-containing monomer wherein monomers are copolymerized in an aqueous medium in the presence of a water-soluble radical polymerization initiator at a first stage to give a first stage-copolymer having an intrinsic viscosity of 0.01 to 3.0 at 35.degree. C. in methyl ethyl ketone and then copolymerized in an aqueous medium in the presence of the first stage-copolymer and an oil-soluble radical polymerization initiator at a second stage to give a second stage-copolymer, said elastomeric copolymer comprising 1 to 80% by weight of the first stage-copolymer and 20 to 99% by weight of the second stage-copolymer, process for preparing the same and composition containing the same. The elastomeric copolymer can be cured at satisfactory cure rate to give cured rubber having low compression set and high elongation.

REFERENCES:
patent: 3475396 (1969-10-01), McCain et al.
patent: 3798287 (1974-03-01), Murayama et al.
patent: 3845024 (1974-10-01), Weaver
patent: 3857807 (1974-12-01), Kometani et al.
patent: 3857827 (1974-12-01), Dohany
patent: 3925339 (1975-12-01), Ishii et al.
patent: 3929934 (1975-12-01), Moore et al.
patent: 3951913 (1976-04-01), Kometani et al.

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