Process for preparing vinyl chloride polymer using hydroxyphenyl

Details Process for preparing vinyl chloride polymer using hydroxyphenyl Process for preparing vinyl chloride polymer using hydroxyphenyl

1989-05-08

1991-04-30

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526200, 526212, C08F 220

Patent

active

050118978

ABSTRACT:
A process for preparing a vinyl chloride containing polymer, comprising: suspension polymerizing vinyl chloride or a vinyl monomer mixture containing vinyl chloride in an aqueous medium; and adding an antioxidant dispersion essentially consisting of an antioxidant having a melting point of not lower than 30.degree. C. and a suspending agent in water to the polymerization system, wherein said antioxidant dispersion has been heated once to a temperature not lower than the melting point of the antioxidant and then cooled, prior to the additon to the polymerization system. This process makes it possible to charge the antioxidant in an accurate amount by a mechanical means, and improve the quality of the manufactured polymer.

REFERENCES:
patent: 4404337 (1983-09-01), Hata
patent: 4659791 (1987-04-01), Gardner

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