Process for making vinylidene fluoride containing fluoroelastome

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

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524545, 524546, 526 84, 526212, 526216, 526236, 526254, 526255, 528489, 528490, C08F 200, C08F 1418

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active

045241970

ABSTRACT:
Making a fluoroelastomer by feeding to an aqueous polymerization medium in a reactor about 25-75% by weight of the total monomers, vinylidene fluoride, at least one other fluorine-containing ethylenically unsaturated monomer containing at least as many fluorine atoms as carbon atoms and copolymerizable with vinylidene fluoride, an inorganic free-radical initiator, a chain transfer agent added in an amount sufficient to maintain a concentration in the aqueous polymerization medium of from about 0.5.times.10.sup.-3 to 5.times.10.sup.-3 moles per 100 grams of total monomers, and from about 0.02-2% by weight, based on the weight of the aqueous medium, of a surfactant which is a compound having the formula:

REFERENCES:
patent: 3707529 (1972-12-01), Gladding et al.
patent: 3839305 (1974-10-01), Moore
patent: 4025709 (1977-07-01), Blaise et al.
patent: 4360652 (1982-11-01), Dohany
patent: 4381384 (1983-04-01), Khan

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