US 4,542,195 AGranted

Method for preventing polymer scale deposition in the polymerization of an ethylenically unsaturated monomer

AssigneeShin-Etsu Chemical Co., Ltd.

InventorsToshihide Shimizu, Ichiro Kaneko, Yoshiteru Shimakura

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Abstract

The invention provides an improved method for preventing polymer scale deposition on the reactor walls, for example, in the suspension polymerization of vinyl chloride by coating the walls prior to introduction of the polymerization mixture with a specific coating composition of which the essential ingredient is a combination of (a) a condensation product of an aromatic amine compound, e.g. aniline or a derivative thereof, and an aromatic nitro compound, e.g. nitrobenzene or a derivative thereof, and (b) a sulfonation product of a condensation product of an aromatic amine compound and an aromatic nitro compound in the form of a salt with an alkali metal or ammonium as dissolved in a solvent.

Claims4

Dependent claims

In a method for preventing deposition of polymer scale on the walls of a polymerization reactor in the polymerization of an ethylenically unsaturated monomer which comprises:

(i) coating the walls of the polymerization reactor prior to the introduction of the polymerization mixture with a coating composition comprising
(a) a condensation product of an aromatic amine compound and an aromatic nitro compound and
(b) an alkali metal or ammonium salt of a sulfonation product of a condensation product of an aromatic amine compound and an aromatic nitro compound, dissolved in a solvent;
(ii) drying the thus coated walls of the polymerization reactor;
(iii) polymerizing said monomer in the presence of a monomer-soluable organic peroxide having a relatively high solubility in water of at least 0.2% by weight of 20.degree. C. as the polymerization initiator.

2 more elements

Dependencies are inferred from the claim text.