Process for producing vinyl chloride-based polymer

Details Process for producing vinyl chloride-based polymer Process for producing vinyl chloride-based polymer

2005-11-15

2005-11-15

Cheung, William K. (Department: 1713)

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

Synthetic resins

Polymerizing in presence of inert solid masses so as to...

C526S344200

Reexamination Certificate

active

06965002

ABSTRACT:
A process is provided for producing a vinyl chloride-based polymer by polymerization of vinyl chloride or a monomer mixture containing it in a reaction vessel. Heat generated during polymerization is removed using a reflux condenser. When the polymerization rate is within a range from 30% to 50%, a copolymeric polyether, with a weight average molecular weight of 1,500,000 to 2,000,000, and an ethylene oxide to propylene oxide molar ratio within a range from 78/22 to 82/18, is added to the reaction mass. Foaming of the polymer slurry due to the use of the reflux condenser beyond the point where the polymerization rate reaches 60% is suppressed, and the polymer can be produced with no deleterious effects on the quality of the product polymer.

REFERENCES:
patent: 4275244 (1981-06-01), Helfert et al.
patent: 5124074 (1992-06-01), Uchiyama et al.
patent: 5807934 (1998-09-01), Takahashi et al.
patent: 2002/0169268 (2002-11-01), Kawakubo et al.
Patent Abstracts of Japan, JP 53-114891, Oct. 6, 1978.

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