Method for the preparation of vinyl chloride polymers

Details Method for the preparation of vinyl chloride polymers Method for the preparation of vinyl chloride polymers

1978-07-18

1980-11-04

Kight, III, John

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 86, 526199, 526202, 526209, 526218, 526230, 5262305, 526232, 5262321, 526908, C08F 220, C08F 1406

Patent

active

042321417

ABSTRACT:
An improved method for the polymerization of vinyl chloride or a monomer mixture mainly composed of vinyl chloride in an aqueous polymerization medium is proposed in which a water-insoluble polymerization initiator, being solid at room temperature as dispersed in the aqueous medium and having a particle size distribution of 50 .mu.m or finer, is added to the polymerization mixture which is maintained at a temperature where the half-life period of the initiator is 120 minutes or longer or, alternatively, over a duration equal to or shorter than one-tenth of the half-life period of the initiator at the temperature of the polymerization mixture. By this method the polymerization can be homogeneously proceeded to produce vinyl chloride polymers having a uniform particle size distribution, excellent heat stability and much less fish-eyes when fabricated into sheets.

REFERENCES:
patent: 3451985 (1969-06-01), Mahlo
patent: 3753966 (1973-08-01), Koyangi et al.
patent: 3790542 (1974-02-01), Koyangi et al.

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