Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in reactor of specified material – or in reactor...
Patent
1982-03-23
1985-07-09
Henderson, Christopher A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in reactor of specified material, or in reactor...
526200, 526202, C08F 220
Patent
active
045283362
ABSTRACT:
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 polymerization, 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 a specified condensation catalyst. 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.
REFERENCES:
patent: 4024301 (1977-05-01), Witenhafer
patent: 4024330 (1977-05-01), Morningstar
patent: 4220743 (1980-09-01), Englin
patent: 4355141 (1982-10-01), Okada
Kaneko Ichiro
Kitamura Hajime
Koyanagi Shunichi
Shimizu Toshihide
Henderson Christopher A.
Shin-Etsu Chemical Co. , Ltd.
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