Process for the production of high-durometer polymers of vinyl c

Details Process for the production of high-durometer polymers of vinyl c Process for the production of high-durometer polymers of vinyl c

1976-09-16

1980-01-15

Henderson, C. A.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526229, 5263442, 528480, 528486, 528487, 528502, C08F 614

Patent

active

041840291

ABSTRACT:
An improved process for the production of emulsifier-containing vinyl chloride polymers suitable for hard processing, the particle diameter of 90% of which is more than 63 .mu., by polymerization of vinyl chloride and optionally monomers copolymerizable therewith in an aqueous emulsion in the presence of water-soluble catalysts and alkali salts of carboxylic acids as emulsifiers at pH 9.5-11.5 and spray-drying the thus-obtained latex, is characterized by conducting the polymerization in a dispersion containing at least 45% by weight of monomers with sodium or potassium salts of fatty acids of 8-18 carbon atoms as emulsifiers to a conversion of at least 80%, and, during the spray-drying step, reducing the pH to 6.0-8.0.

REFERENCES:
patent: 2829134 (1958-04-01), DeCoene
patent: 2957858 (1960-10-01), O'Donnell
patent: 3311579 (1967-03-01), Donat
patent: 3883494 (1975-05-01), Winter
patent: 3993857 (1976-11-01), Smolinski

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