Method for the preparation of a vinyl chloride-based polymer

Details Method for the preparation of a vinyl chloride-based polymer Method for the preparation of a vinyl chloride-based polymer

1993-09-24

1995-09-12

Schofer, Joseph L.

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

Synthetic resins

Removing and recycling removed material from an ongoing...

5263442, 526345, C08F 1406

Patent

active

054497230

ABSTRACT:
An improvement is proposed in the method for the preparation of a polyvinyl chloride resin by the suspension polymerization of the monomer in a polymerization reactor system comprising a reactor and an external heat exchanger connected to the reactor by a pipe line through a pumping means in order to supplement the deficiency in the cooling capacity of the jacket of the reactor and/or reflux condenser installed thereto when the capacity of the reactor is greatly increased. While such an external circulating circuit using a conventional pump suffers from a serious problem of polymer scale deposition on the inner walls of the circuit and downgrading of the quality of the resin product, these drawbacks can be dissolved by using a specific pump having an impellor in the form of a single spiral screw blade around a hub having a conical configuration to circulate the polymerization mixture through the heat exchanger for the removal of the heat of polymerization, which is started at or after the moment when the temperature of the polymerization mixture in the reactor reaches the predetermined polymerization temperature but before the conversion of the monomer to polymer exceeds 10%.

REFERENCES:
patent: 2979492 (1961-04-01), Governale et al.
patent: 3004013 (1961-10-01), Kircher et al.
patent: 3926931 (1975-12-01), Koyanagi et al.
patent: 4464517 (1984-08-01), Makino et al.

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