Composition and process and use in reactor scale prevention

Details Composition and process and use in reactor scale prevention Composition and process and use in reactor scale prevention

C - Chemistry, Metallurgy

07

D

402/545, 260/243

C07D 279/20 (2006.01) C08F 2/00 (2006.01) C08F 14/06 (2006.01)

Patent

CA 1307262

CASE 5924 06/23/1988 NOVEL COMPOSITION AND PROCESS AND USE IN REACTOR SCALE PREVENTION Abstract of the Disclosure A composition having the formula Image wherein n has an average value of one to about five, is disclosed for use in reducing or eliminating the formation of reactor scale during the polymerization of vinyl chloride and comonomers. The composition is prepared by reacting phenothiazine with formaldehyde in the presence of a liquid diluent that is a solvent for the phenothiazine, but a non-solvent for the dimer of phenothiazine and formaldehyde. The process of the invention is preferably conducted in the presence of a strong acid catalyst. The formaldehyde is preferably added slowly to the reaction mixture over the course of the reaction. The product can be filtered and dried.

573905

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