C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 14/06 (2006.01) C08F 14/00 (2006.01) C08J 3/00 (2006.01)
Patent
CA 2049456
Abstract of the Disclosure A method for preparing powder of a vinyl chloride polymer comprises the steps of polymerizing vinyl chloride monomer or a vinyl monomer mixture mainly comprising vinyl chloride monomer in an aqueous medium and adding, to the polymerization system, a fluorine atom-containing nonionic surfactant in an amount ranging from 0.0001 to 0.5 part by weight per 100 parts by weight of the vinyl chloride monomer or the vinyl monomer mixture mainly comprising vinyl chloride monomer after the rate of polymerization reaches at least 70% or fine powder of at least one inorganic substance having a particle size ranging from 0.001 to 50 µ m in an amount ranging from 0.001 to 1.0 part by weight per 100 parts by weight of the vinyl chloride monomer or the vinyl monomer mixture mainly comprising vinyl chloride monomer after the rate of polymerization reaches at least 70%. The method for preparing powder of a vinyl chloride polymer makes it possible to form powder of a vinyl chloride polymer which is not electrically charged during, for instance, the storage and transport thereof. The resulting polymer powder hardly causes reduction of the bulk density and flow properties.
Amano Tadashi
Koga Toshimichi
Shin-Etsu Chemical Co. Ltd.
Swabey Ogilvy Renault
LandOfFree
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