Process of polymerizing chloroetrifluoroethylene with alkyl hydroperoxide and metal metabisulfite
AssigneeAlliedSignal Inc.
InventorsBryce C. Oxenrider, Frank Mares, Mo-Shu Yang
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Abstract
Process for the production of PCTFE homopolymer and/or copolymer resins by the use of an aqueous suspension system incorporating a redox initiator system which comprises t-butyl hydroperoxide and sodium metabisulfite to initiate the polymerization or copolymerization process. The process parameters may be controlled to provide a PCTFE homopolymer or copolymer resin having a desired target range of molecular weights. The process provides stable PCTFE polymer suspensions which exhibit a low tendency to coagulate and further exhibit good wettability of the homopolymer and copolymer particles, notably in the absence of soaps.
Claims12
A process for forming stable, aqueous suspensions of poly(chlorotrifluoroethylene) or a copolymer of chlorotrifluoroethylene and at least one copolymerizable monomer which comprises:
- (a) forming a polymerization reaction mixture comprising a monomer selected from the group consisting of chlorotrifluoroethylene or a combination of chlorotrifluoroethylene and at least one copolymerizable monomer and a redox initiator system comprising a mixture of an alkyl hydroperoxide and an alkali metal metabisulfite in a reaction solvent comprising water;
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- (b) polymerizing said monomer in the absence of a soap or a surfactant while maintaining said mixture at a controlled temperature between about 0.degree. C., and 75.degree. C. to form a stable aqueous suspension of said poly(chlorotrifluoroethylene) or said copolymer.
Dependencies are inferred from the claim text.