Process for preparing spherical and porous vinyl resin particles

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

1981-09-08

1982-11-23

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

043606512

ABSTRACT:
Process for making porous, substantially spherical particles of vinyl polymers or resins by the use of the suspension polymerization technique. In the polymerization there is employed a water-insoluble dispersant comprised of a substantially unneutralized crosslinked interpolymer of one or more carboxylic acid monomers with a polyunsaturated compound having a plurality of terminally unsaturated polymerizable groups and optionally a water-soluble surfactant with a polyether type hydrophilic segment using rapid stirring or high agitation while employing a monomer-soluble free radical yielding polymerization catalyst. When using the new process, the polymer buildup in the reactor is substantially reduced.

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patent: 3423352 (1969-01-01), Levine et al.
patent: 3620988 (1971-11-01), Cohen
patent: 3706722 (1972-12-01), Nelson et al.
patent: 3907730 (1975-09-01), Jones
patent: 4186259 (1980-01-01), Bush et al.
patent: 4228264 (1980-10-01), Yamamoto et al.
patent: 4319012 (1982-03-01), Morningstar

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