Process for producing porous spherical polyvinyl chloride partic

Details Process for producing porous spherical polyvinyl chloride partic Process for producing porous spherical polyvinyl chloride partic

1987-02-06

1987-08-04

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 65, 521146, 526201, 526209, 526344, 5263442, 5263443, C08J 900

Patent

active

046846689

ABSTRACT:
An improved process is provided for producing porous PVC resin particles by a thickened aqueous suspension polymerization process comprising polymerizing vinyl chloride monomer in an aqueous suspension wherein said aqueous medium contains at least one dispersant capable of thickening water, and optionally at least one secondary surfactant, at least one oil-soluble free radical generating catalyst, the improvement comprising charging said free radical catalyst as a solution wherein the solvent for said catalyst solution has a density equal to or less than that of the monomer being polymerized and the catalyst solution has a density less than water.

REFERENCES:
patent: 3620988 (1971-11-01), Cohen
patent: 3706722 (1972-12-01), Nelson et al.
patent: 4229547 (1980-10-01), Cohen et al.
patent: 4360651 (1982-11-01), Dinbergs
patent: 4435524 (1984-03-01), Dinbergs
patent: 4458057 (1984-07-01), Baser
patent: 4603151 (1986-07-01), Dinbergs

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