Suspension polymerization of vinyl chloride

Details Suspension polymerization of vinyl chloride Suspension polymerization of vinyl chloride

C - Chemistry, Metallurgy

08

F

C08F 2/18 (2006.01) C08F 2/00 (2006.01) C08F 14/06 (2006.01)

Patent

CA 2050379

ABSTRACT OF THE DISCLOSURE An improvement is proposed in the process of suspension polymerizatiopn of vinyl chloride monomer in an aqueous poly- merization medium, by which a resin product of high quality rela- tive to the contents of foamy resin and fish-eyes can be produced in a high efficiency with little deposition of polymer scale on the reac- tor 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 polymeriza- tion mixture at a temperature of 55 °C or higher during a period starting from a moment when the temperature of the polymeriza- tion mixture under temperature elevation up to the polymeriza- tion temperature is still 45 °C or lower to a moment when conver- sion of the monomer into polymer is at least 10% so that foaming on the polymerization mixture can be greatly reduced.

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