Process for preparing polymer particles

Details Process for preparing polymer particles Process for preparing polymer particles

1990-03-06

1993-02-23

Seidleck, James J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525178, 525264, 525304, 525902, 525285, 525301, 525308, 525313, C08F26506, C08F27902, C08F 224

Patent

active

051891077

ABSTRACT:
Polymer particles prepared by polymerizing polymerizable monomers by seed polymerization, with far more excellent polymerization stability than conventional seed polymerization processes, in the presence of a polymer emulsion comprising low molecular weight polymer particles, radically polymerizable in an aqueous system. The polymer particles are present in an amount of 0.5-30 parts by weight (on solid basis) per 100 parts by weight of polymerizable monomers, have a weight average molecular weight of 500-10,000 and are prepared by emulsion polymerization or soap-free polymerization. The seed polymerization is carried out by initially charging less than 30% by weight of said polymerizable monomers to the polymerization mixture, and after the polymerization conditions are established, by continuously or intermittently adding the remaining portion of said polymerizable monomers to the reaction system.

REFERENCES:
patent: 3678133 (1972-07-01), Ryan
patent: 4801646 (1989-01-01), Henton
patent: 4882383 (1989-11-01), Ting
patent: 4912162 (1990-03-01), Kishida et al.
patent: 4972000 (1990-11-01), Kawashima et al.

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