Reducing PVC polymer buildup in polymerization reactors with dithioxamides and alumina
AssigneeContinental Oil Company
InventorsDean Raymond Weimer, Albert M. Durr, Jr.
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Abstract
A method for preventing polymer buildup in the polymerization reactor during the suspension polymerization of vinyl chloride monomer to form polyvinyl chloride polymer and copolymers, the method comprising coating reactor surfaces in contact with the reaction medium with a material selected from the group consisting of alumina, dithiooxamide, and mixtures of these prior to carrying out this polymerization.
Claims9
A method for preventing polymer buildup in a polymerization reactor during the suspension polymerization of vinyl chloride monomer to form polyvinyl chloride polymer and copolymer, the method comprising coating reactor surfaces in contact with the reaction medium with a material selected from the group consisting of a mixture of alumina and dithiooxamide prior to carrying out the polymerization, wherein said coating contains from about 1 to about 20 weight percent alumina and from about 0.05 to about 5 weight percent dithiooxamide, based on the total weight of the coating.
Dependencies are inferred from the claim text.