Process for suspension polymerization of vinyl chloride in a rea

Details Process for suspension polymerization of vinyl chloride in a rea Process for suspension polymerization of vinyl chloride in a rea

1987-06-30

1989-07-18

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 80, 526 81, 526 88, C08F 220

Patent

active

048494828

ABSTRACT:
The present invention provides a process for producing vinyl chloride resin in suspension polymerization of vinyl chloride monomer by the use of a polymerization reactor equipped with a reflux condenser using an improved brumagine-type impeller equipped with auxiliary blade/s, and polymerization is started in a range of 0.8 to 1.0 of the water/monomer ratio, polymerization temperature is raised to 3.degree. to 10.degree. C. at polymer conversion being not more than 50 weight percent, with water being added in the course of polymerization not more than making up for the volumetrical contraction resulting from the progress of polymerization so that upon completion of polymerization the water/monomer ratio is controlled in a range of 1.0 to 1.4. The polyvinyl chloride resin obtained by the present process is superior in quality such as high bulk density and little fish eye with high productivity.

REFERENCES:
patent: 3183208 (1965-05-01), Jurgeleit
patent: 3692718 (1972-09-01), Golstein
patent: 3926910 (1975-12-01), Mowdood
patent: 3956251 (1976-05-01), Feiler
patent: 4058495 (1977-11-01), Serratore
patent: 4217444 (1980-08-01), Pompon
patent: 4455413 (1984-06-01), Tomishima

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