Process for the preparation in microsuspension of a vinyl chlori

Details Process for the preparation in microsuspension of a vinyl chlori Process for the preparation in microsuspension of a vinyl chlori

1986-09-02

1987-12-29

Schofer, Joseph L.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C08L 2706

Patent

active

047161957

ABSTRACT:
A process for the preparation of a vinyl chloride polymer latex having particles with a mean diameter between about 0.2 and 0.8 .mu.m and containing at least one organosoluble polymerization initiator comprising dispersing in an aqueous reaction medium also containing parabenzoquinone, at least one monomer, at least one anionic emulsifier and optionally at least one nonionic emulsifier, and from about 0.004 to 0.16% by weight, with respect to said at least one monomer, of said initiator expressed in terms of active oxygen, polymerizing said at least one monomer at a desired polymerization temperature, .theta..sub.1, and continuously adding parabenzoquinone to said aqueous reaction medium during the polymerization when the temperature .theta..sub.2 of the reaction medium is such that the difference .theta..sub.2 -.theta..sub.1 exceeds a value from 0.degree. to +5.degree. C. The invention also includes the resultant products and their use in seeded microsuspensions for the preparation of vinyl chloride polymers.

REFERENCES:
patent: 2771457 (1956-11-01), Barnes et al.
patent: 3595840 (1971-07-01), Moberly et al.
patent: 4093788 (1978-06-01), Jin et al.
patent: 4181787 (1980-01-01), McOnie et al.
patent: 4191676 (1980-03-01), Hall
patent: 4256863 (1981-03-01), McOnie et al.

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