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US 4,758,639 AGranted
Process for production of vinyl polymer
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsShunichi Koyanagi, Hajime Kutamura, Toshihide Shimizu, Ichiro Kaneko
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AssigneeShin-Etsu Chemical Co., Ltd.
InventorsShunichi Koyanagi, Hajime Kutamura, Toshihide Shimizu, Ichiro Kaneko
Estimating the term…
A process for production of a vinyl polymer by suspension polymerization or emulsion polymerization of at least one kind of vinyl monomer in an aqueous medium is disclosed. In this process, 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 having a surface roughness of not greater than 5 .mu.m and 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. According to this process, scaling on the inner wall surface of a polymerizer, etc. during polymerization can be prevented effectively and surely.
A process for production of a vinyl polymer comprising polymerizing, by suspension polymerization or emulsion polymerization, at least one kind of vinyl monomer in an aqueous medium in a polymerizer, wherein the inner wall surface of the polymerizer and portions of the auxilliary equipment thereof which come into contact with the monomer during polymerization have a surface roughness of not greater than 1 .mu.m and have been previously coated with a scaling preventive coating comprising at least one component selected from dyes and pigments.
Dependencies are inferred from the claim text.