Fluorine-containing elastomer and a shaped article thereof

Details Fluorine-containing elastomer and a shaped article thereof Fluorine-containing elastomer and a shaped article thereof

1987-08-17

1989-05-16

Herbert, Thomas J.

Stock material or miscellaneous articles

Composite

Of fluorinated addition polymer from unsaturated monomers

428422, 526254, 526255, B32B 2732, C08F21422, C08F21426, C08F21428

Patent

active

048309206

ABSTRACT:
The fluorine-containing elastomer of the present invention is a novel elastomer comprising vinylidene fluoride units and, hexafluoropropylene units, optionally with tetrafluoroethylene units, and wherein the fluorine content of the elastomer is 63.5 to 71% by weight, the content of fractions having molecular weights of 50,000 or less (M.sub.5) in the elastomer is 5% by weight or less, the content of fractions having molecular weights of 1,000,000 or more (M.sub.100) in the elastomer is 10 to 35% by weight, and the limiting viscosity number (ml/g) of the elastomer is in the range of from 100 to less than 250. The fluorine-containing elaastomer of the present invention is excellent in resistance to heat and chemicals and is not only extremely excellent in compression set resistance properties and mechanical properties but also has a satisfactory workability. Further, by vulcanization of the elastomer, there can be provided excellent shaped articles such as rings, gaskets, seals, diaphragms and the like.

REFERENCES:
patent: 2968649 (1961-01-01), Pailthorp et al.
patent: 3801552 (1974-04-01), Kometani et al.
patent: 4123603 (1978-10-01), Stewart, Jr.
patent: 4720405 (1988-01-01), Carson et al.

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