Latex modified portland cement and use thereof in polymerization reactors
AssigneeThe B. F. Goodrich Company
InventorRichard Harold Backderf
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Abstract
In the aqueous polymerization of vinyl chloride and vinylidene chloride polymers and copolymers, the polymer build up normally experienced in many areas of commercial polymerization reactors is reduced, or when such polymer build up does occur it is more readily removed, when these trouble areas in polymerization reactors are coated with a latex-modified portland cement composition, the polymer in said latex containing carboxyl groups and the polymer having a Tg .degree. C. of less than about 40.degree. C., preferably less than about 25.degree. C.
Claims12
In the aqueous polymerization of vinyl halide monomers having the structural formula ##STR13##
- where X is chlorine and Y is chlorine or hydrogen, in a polymerization vessel wherein there are areas of excessive polymer build up on the surfaces and fixtures in said vessel exposed to the suspension during said polymerization, the improvement comprising coating said areas of excessive polymer build up prior to the polymerization reaction with a composition comprising portland cement and an aqueous dispersion containing up to about 65 weight percent of a polymer containing about 0.1 to 25 weight percent carboxyl groups and having a Tg.degree. C. of less than 40.degree. C., said polymer present in said composition in an amount less than about 10 weight parts per 100 weight parts of said composition.
Dependencies are inferred from the claim text.