Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in reactor of specified material – or in reactor...
Patent
1987-07-21
1988-07-12
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in reactor of specified material, or in reactor...
526 74, 526191, 526201, 526204, 5262181, 5263442, C08F 218, C08F 222, C08F 244
Patent
active
047571241
ABSTRACT:
This process is a process for production of a vinyl chloride polymer by suspension polymerization or emulsion polymerization of vinyl chloride monomer or a mixture of vinyl chloride monomer with a vinyl monomer copolymerizable with said vinyl chloride monomer in an aqueous medium, characterized in that the polymerization is carried out in a polymerizer, the inner wall surface and portions of the auxiliary equipment thereof which may come into contact with the monomer during polymerization being previously coated with a scaling preventive comprising at least one selected from dyes, pigments and aromatic or heterocyclic compounds having at least 5 conjugated .pi. bonds, while controlling the chloride ion concentration in the reaction mixture to not higher than 100 ppm. According to said process, scaling onto the inner wall surface of a polymerizer, etc. during polymerization can be prevented effectively and surely.
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Preparation and Properties of Polyvinyl Chloride, Zilberman et al., Chimija, 1968, pp. 24-29--WPS-1 USSR.
Kaneko Ichiro
Kitamura Hajime
Koyanagi Shunichi
Shimizu Toshihide
Schofer Joseph L.
Shin-Etsu Chemical Co. , Ltd.
Teskin F. M.
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