Preparation of vinyl chloride polymers

Details Preparation of vinyl chloride polymers Preparation of vinyl chloride polymers

C - Chemistry, Metallurgy

08

F

402/304, 402/487

C08F 14/06 (2006.01) C08F 2/00 (2006.01)

Patent

CA 2039765

ABSTRACT OF THE DISCLOSURE Preparation of vinyl chloride polymers A process for preparation of a vinyl chloride polymer comprising the steps of subjecting an aqueous me- dium 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 104 sec-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-1, and thereafter start- ing suspension polymerization. Even with a decreased amount of dispersant, the process inhibits the coarsening of the polymer particles, to yield the polymer with a nar- row particle diameter distribution. Deposition of scale and formation of fish-eyes are also prevented effectively.

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