Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in reactor of specified material – or in reactor...
Patent
1987-09-03
1988-07-19
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, 427239, 427327, C08F 218, C08F 222, C08F 244
Patent
active
047586397
ABSTRACT:
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.
REFERENCES:
patent: 3923765 (1975-12-01), Goetze et al.
patent: 4049895 (1977-09-01), McOnie et al.
patent: 4539230 (1985-09-01), Shimizu et al.
Kaneko Ichiro
Koyanagi Shunichi
Kutamura Hajime
Shimizu Toshihide
Schofer Joseph L.
Shin-Etsu Chemical Co. , Ltd.
Teskin F. M.
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