Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1993-11-30
1994-10-18
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C08F 438
Patent
active
053570111
ABSTRACT:
A process for producing a vinyl chloride-based polymer, which comprises suspension polymerizing vinyl chloride monomer or a vinyl chloride-containing monomeric mixture in an aqueous medium in the presence of an oil-soluble polymerization initiator, wherein the initiator comprises (A) at least one compound having a 10-hour half-life temperature, at a concentration of 0.1 mol/l in benzene, of not lower than 35.degree. C., and (B) at least one compound having a 10-hour half-life temperature, at a concentration of 0.1 mol/l in benzene, of lower than 35.degree. C., with the amount of the initiator (B) being from 0.01 to 0.07% by weight based on the monomer or monomeric mixture and being from 10 to 30% by weight based on the total amount of the initiators (A) and (B). The process makes it possible to shorten easily the time required for raising temperature, and to produce vinyl chloride-based polymers which have a good particle size distribution and which have few fish eyes when formed into sheets or the like.
REFERENCES:
patent: 4914169 (1990-04-01), Suyama et al.
Amano Tadashi
Ohnishi Shuji
Sarofim N.
Schofer Joseph L.
Shin-Etsu Chemical Co. , Ltd.
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