Process for making vinylidene fluoride containing fluoroelastome

Details Process for making vinylidene fluoride containing fluoroelastome Process for making vinylidene fluoride containing fluoroelastome

1984-08-28

1985-06-18

Wong, Jr., Harry

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

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

Patent

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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