US 4,539,230 A · Method for preventing deposition of polymer scale and a coating agent therefor

Abstract

The invention provides a method for preventing deposition of polymer scale on the reactor walls in the polymerization of an ethylenically unsaturated monomer, in particular, by emulsion polymerization. The method comprises coating the reactor walls with a coating composition containing, as the essential components, (A) an organic compound having at least 5 conjugated .pi. bonds in a molecule, (B) a chelating agent and (C) a metal compound capable of producing metal ions having a coordination number of at least 2 which presumably forms a metallic chelate compound with the chelating agent contributing to the formation of a strongly adsorbed layer on the reactor walls. The coating composition may be further admixed with a silicic acid compound such as a colloidal silica.

Claims7

Dependent claims

A method for preventing deposition of polymer scale on the walls of a polymerization reactor in the course of a polymerization reaction of an ethylenically unsaturated monomer or a mixture of ethylenically unsaturated monomers which comprises the steps of:

(a) coating the reactor walls with a coating composition comprising:
(A) an organic compound having at least 5 conjugated .pi. bonds in a molecule,
(B) a chelating agent, and
(C) a metal compound capable of producing metal ions having a coordination number of at least 2, as dissolved or dispersed in a solvent;
and
(b) drying the thus coated reactor walls, prior to introduction of the polymerization mixture into the polymerization reactor.

3 more elements

Dependencies are inferred from the claim text.

Method for preventing deposition of polymer scale and a coating agent therefor

Life of this patent

Method for preventing deposition of polymer scale and a coating agent therefor

Life of this patent

Abstract

Claims7