C - Chemistry – Metallurgy – 08 – F
Patent
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.
Amano Tadashi
Hoshida Shigehiro
Shirota Yoshihiro
Gowling Lafleur Henderson Llp
Shin-Etsu Chemical Co. Ltd.
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