Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in reactor of specified material – or in reactor...
Patent
1992-11-09
1994-03-15
Henderson, Christopher
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in reactor of specified material, or in reactor...
526 88, 5263442, C08F 218
Patent
active
052946843
ABSTRACT:
A process for producing a vinyl chloride polymer by polymerizing a monomer comprising vinyl chloride by suspension polymerization in a polymerization vessel on the inner wall surface of which a coating of a polymer scale preventive agent is formed, comprising the steps of applying a high-speed shearing force to a mixture comprising water, the monomer, a polymerization initiator, and (A) a dispersant comprising a partially saponified polyvinyl alcohol having a specified average degree of polymerization and a specified degree of saponification plus (B) a dispersant comprising a hydroxypropylmethylcellulose which has a specified methoxyl substitution degree, a specified hydroxypropoxyl substitution degree, and a specified viscosity and subjecting the mixture to said suspension polymerization. A vinyl chloride polymer having an average particle diameter of 200 to 600 .mu.m and a narrow particle size distribution and excellent in plasticizer take-up, etc. is provided.
REFERENCES:
patent: 4228268 (1980-10-01), Musha
patent: 4758639 (1988-07-01), Koyanagi
patent: 4845174 (1989-07-01), Amano
patent: 4933399 (1990-06-01), Shimizu
Fujimoto Tatsuya
Fujiwara Makoto
Kaneko Ichiro
Henderson Christopher
Shin-Etsu Chemical Co. , Ltd.
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