Process for preparing vinyl chloride polymer

Details Process for preparing vinyl chloride polymer Process for preparing vinyl chloride polymer

1994-08-10

1996-03-26

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526202, C08F 220

Patent

active

055021239

ABSTRACT:
Polyvinyl chloride is prepared by suspension polymerization of a monomeric charge of vinyl chloride dispersed and suspended in an aqueous medium while agitating the suspension. An oil-soluble partially saponified polyvinyl alcohol is added to the monomeric charge as a dispersant at the start of polymerization. A water-soluble partially saponified polyvinyl alcohol and/or a hydroxypropylmethyl cellulose is continuously added as a suspending agent from the start of polymerization. The suspending agent is entirely added while the polymerization rate is in the range of 5-50%. The agitating power applied to the aqueous suspension is 50-110 kg.multidot.m/s.multidot.ton while the suspending agent is being added, and increased above 110 kg.multidot.m/s.multidot.ton after the completion of addition. The resulting polymer has a high bulk density and a sharp particle size distribution and is susceptible to extrusion.

REFERENCES:
patent: 4324878 (1982-04-01), Biaggi
patent: 4849482 (1989-07-01), Kobayashi
patent: 5096988 (1992-03-01), Amano
patent: 5204421 (1993-04-01), Amano
patent: 5286796 (1994-02-01), Amano
patent: 5342906 (1994-08-01), Amano

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