Method for suspension-polymerizing vinyl chloride

Details Method for suspension-polymerizing vinyl chloride Method for suspension-polymerizing vinyl chloride

1977-04-18

1979-01-23

Henderson, C. A.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 88, 526204, 526221, 526236, C08F 220, C08F11406

Patent

active

041362420

ABSTRACT:
A polymerization vessel equipped with a condenser is charged with vinyl chloride, a suspending agent or dispersing agent, and water. The mixture is subjected to a preparatory stirring in the absence of a catalyst. The polymerization catalyst is added thereto when bubbling caused by the preparatory stirring subsides and stable suspended oil drops form. Blockage of the condenser by polymer scale deposition is substantially reduced. The addition of an alkaline substance, an oxidizing substance or an azine dye further reduces polymer scale deposition. Preferably the operation of the condenser is initiated only after the conversion rate is higher than 5% or the average value per unit hour.

REFERENCES:
patent: 3340243 (1967-09-01), Beer
patent: 3541061 (1970-11-01), Heiberger
patent: 3562238 (1971-05-01), Parks
patent: 3577401 (1971-05-01), Smith
patent: 3627744 (1971-12-01), Hopkins
patent: 3926931 (1975-12-01), Koyanagi

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