C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/296, 402/397
C08F 2/10 (2006.01) B01J 19/02 (2006.01) C08F 2/00 (2006.01) C08F 2/16 (2006.01) C08F 14/06 (2006.01) C08F 14/16 (2006.01) C08F 22/00 (2006.01) C08F 114/06 (2006.01) C08F 114/16 (2006.01) C08F 122/00 (2006.01) C08F 214/06 (2006.01) C08F 214/16 (2006.01) C08F 222/00 (2006.01) C08G 65/00 (2006.01) C08G 69/00 (2006.01) C08G 73/00 (2006.01)
Patent
CA 1203346
ABSTRACT OF THE DISCLOSURE The invention provides a very efficient method with highly durable effect for preventing polymer scale deposition on the reactor walls and other surfaces coming into contact with the monomer during polymerization of an ethylenically unsaturated polymerizable monomer in an aqueous medium such as in the suspension polymerization of vinyl chloride. The method comprises coating the reactor walls, prior to polymer- ization, with a novel coating material which is a condensation product obtained by the condensation reaction of an aromatic amine compound such as aniline and an aromatic nitro compound such as nitrobenzene in the presence of a mineral acid and condensation catalyst at a temperature in the range from 10° to 250°C. It is sometimes preferable that the condensation product is basified or treated with an alkali or ammonium compound to be imparted with a modified solubility behavior.
399193
Kaneko Ichiro
Kitamura Hajime
Koyanagi Shunichi
Shimizu Toshihide
G. Ronald Bell & Associates
Shin-Etsu Chemical Co. Ltd.
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