Preparation of vinyl chloride polymers using high-speed and low-

Details Preparation of vinyl chloride polymers using high-speed and low- Preparation of vinyl chloride polymers using high-speed and low-

1992-09-28

1994-03-08

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 62, 526 74, C08F 218

Patent

active

052928365

ABSTRACT:
A process for preparation of a vinyl chloride polymer comprising the steps of subjecting an aqueous medium containing vinyl chloride monomer or a mixture of vinyl chloride monomer with other vinyl monomer, a polymerization initiator and a dispersant to high-speed shear agitation at a shear rate of 10.sup.4 sec.sup.-1 or above to prepare a suspended dispersion containing fine particles of the monomer(s) dispersed therein, then subjecting the suspended dispersion to low-speed shear agitation at a shear rate of from 10 to 100 sec.sup.-1, and thereafter starting suspension polymerization. Even with a decreased amount of dispersant, the process inhibits the coarsening of the polymer particles, to yield the polymer with a narrow particle diameter distribution. Deposition of scale and formation of fish-eyes are also prevented effectively.

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patent: 4732954 (1988-03-01), Carroll, Jr. et al.
patent: 4933399 (1990-06-01), Shimizu
patent: 4940759 (1990-07-01), Yang

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