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US 4,098,978 AGranted
Process for emulsion polymerization of vinylidene halides and product thereof
AssigneeThe B. F. Goodrich Company
InventorsBela Kalman Mikofalvy, James Wilson Turner
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Abstract
At least one vinylidene halide monomer is polymerized in an aqueous emulsion medium in admixture with ammonium persulfate and at least one ammoniated anionic emulsifier, preferably also together with hydrogen peroxide. The polymerization process is maintained at a pH of at least about 8.5 using ammonium hydroxide. The polymerization process is conducted in the substantial absence of alkali metal ions. Polymerization is both rapid and linear. The resulting polymers have excellent heat stability and water whitening resistance.
Claims11
A process for preparing a polymer, said process comprising:
- (A) polymerizing (1) from about 50 to 100 weight percent of at least one vinylidene halide monomer having the formula ##STR5## wherein X is chlorine, and Y is hydrogen or chlorine, together with (2) from about 0 to 50 weight percent of at least one other unsaturated monomer copolymerizable therewith,
- (B) in an aqueous emulsion medium in admixture with (1) an initiator consisting essentially of ammonium persulfate or a mixture of ammonium persulfate and hydrogen peroxide, and (2) at least one ammoniated anionic emulsifier, said emulsifier being substantially metal-free,
- (C) said polymerization process being maintained at a pH of at least 8.5 using ammonium hydroxide, and
- (D) polymerization being conducted in the presence of less than 100 ppm of alkali metal ions based upon total monomer weight, the amount of alkali metal ions also being less than 100 ppm after polymerization is complete.
1 more element
Dependencies are inferred from the claim text.