Process for preparing stable, finely divided polymer dispersions

Details Process for preparing stable, finely divided polymer dispersions Process for preparing stable, finely divided polymer dispersions

1998-02-24

2000-08-15

Harris, Cynthia

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

Synthetic resins

Processes of preparing a desired or intentional composition...

516925, 516 58, 516 53, 526932, 524801, C08J 300, C08F 232, C07C 4140

Patent

active

061037869

ABSTRACT:
Stable polymer dispersions with polymer particle sizes of 0.1 to 10 .mu.m are prepared by dissolving a water-in-oil emulsion, comprising a polymer dissolved in an organic solvent which is immiscible with water (organic phase) and an aqueous phase, wherein the viscosity of the organic phase is 1.0 to 20,000 mPas (measured at 25.degree. C.), the surface tension between organic and aqueous phase is 0.01 to 30 mN/m, the particle size of the water emulsified in the organic phase is 0.2 to 50 .mu.m and the ratio by volume of organic phase to aqueous phase is in the range 80:20 to 20:80, subjecting this emulsion to a shear process at a shear power of 1.times.10.sup.3 to 1.times.10.sup.8 Watts per cm.sup.3, wherein the water-in-oil emulsion is converted into an oil-in-water emulsion.

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"Colloid & Polymer Science" SCI 267:1113-1116 (1989).

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