Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in reactor of specified material – or in reactor...
Patent
1991-08-07
1993-05-11
Henderson, Christopher
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
052101584
ABSTRACT:
An improvement is proposed in the process of suspension polymerizatiopn of vinyl chloride monomer in an aqueous polymerization medium, by which a resin product of high quality relative to the contents of foamy resin and fish-eyes can be produced in a high efficiency with little deposition of polymer scale on the reactor walls. The improvment comprises heating and keeping the surfaces of the polymerization reactor and accessory equipment coming into contact with the gaseous phase above the polymerization mixture at a temperature of 55.degree. C. or higher during a period starting from a moment when the temperature of the polymerization mixture under temperature elevation up to the polymerization temperature is still 45.degree. C. or lower to a moment when conversion of the monomer into polymer is at least 10% so that foaming on the polymerization mixture can be greatly reduced.
REFERENCES:
patent: 3004013 (1961-10-01), Kircher
patent: 4224424 (1980-09-01), Bauman
patent: 4659791 (1987-04-01), Gardner
Amano Tadashi
Hoshida Shigehiro
Shirota Yoshihiro
Henderson Christopher
Shin-Etsu Chemical Co. , Ltd.
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