Process for producing granular vinyl chloride polymer

Details Process for producing granular vinyl chloride polymer Process for producing granular vinyl chloride polymer

1987-03-16

1988-01-26

Schofer, Joseph L.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528502, 528503, 523330, 524297, 524569, 34 10, C08F 624

Patent

active

047217731

ABSTRACT:
A granular vinyl chloride polymer is produced by mixing an aqueous dispersion of a vinyl chloride polymer with an organic liquid being difficulty soluble in water and incapable of dissolving or swelling the vinyl chloride polymer to prepare an aggregate of particles of the vinyl chloride polymer, dehydrating the aggregate and then drying it. The drying is carried out by using a fluidized drying machine under such conditions that the temperature of the vinyl chloride polymer is not more than 40.degree. C. in the constant rate period of drying and not more than 50.degree. C. in the falling rate period of drying.

REFERENCES:
patent: 3772252 (1973-11-01), Blunt
patent: 4389522 (1983-06-01), Boeke et al.
patent: 4604454 (1986-08-01), Nishina et al.
Nakamura (Translation of Jap. Kokai Pat. Appl. Pub. No. Sho 57[1982]-209905).
"Chem. Eng. Hndbk", J. Perry (ed.), McGraw-Hill Inc., N.Y. (1950) pp. 800-807.

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