Process for producing spherical and porous vinyl resin particles

Details Process for producing spherical and porous vinyl resin particles Process for producing spherical and porous vinyl resin particles

1982-10-27

1984-07-03

Foelak, Morton

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

521 56, 521 65, 526202, 5263442, 5263443, C08F 220

Patent

active

044580576

ABSTRACT:
There is disclosed a process for making vinyl polymer particles that are spherical, highly porous and of uniform size and substantially no polymer buildup on the reactor surfaces. A dispersion or emulsion is first formed with high agitation comprised of an aqueous medium containing a water-insoluble suspending or dispersing agent, the monomer or monomers to be polymerized, a monomer-soluble free radical yielding catalyst, and a surfactant or surfactant system. The dispersion is neutralized with an alkali and then polymerized with stirring to a conversion of about 10% to about 30% and then continuing the reaction to completion with increased stirring, the stirring in both instances being no greater than that used in making the dispersion or emulsion. The dispersing agent employed comprises an unneutralized crosslinked interpolymer of one or more carboxylic acid monomers with a polyunsaturated compound having a plurality of terminally unsaturated polymerizable groups.

REFERENCES:
patent: 3620988 (1971-11-01), Cohen
patent: 3907730 (1975-09-01), Jones
patent: 4229547 (1980-10-01), Cohen et al.
patent: 4360651 (1982-11-01), Dinbergs

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