Preparation of finely divided polymer powders

Details Preparation of finely divided polymer powders Preparation of finely divided polymer powders

1991-11-21

1998-08-18

Schofer, Joseph L.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523340, 524801, 524291, 524555, 526306, 428402, C08K 0000

Patent

active

057959269

ABSTRACT:
A process is described for the preparation of finely divided polymer powders by polymerizing water-soluble monomers in the aqueous phase of a water-in-oil emulsion in the presence of water-in-oil emulsifiers and polymerization initiators, removing the water from the resultant water-in-oil polymer suspension by azeotropic distillation, and isolating the suspended, finely divided polymer powder, either the polymerization of the water-soluble monomers being carried out in the presence of from 0.1 to 10% by weight, based on the monomers employed in the polymerization, of protective colloids, or the protective colloids being added to the water-in-oil polymer suspension after the polymerization is complete. The polymerization is preferably carried out in the presence of surfactant. The finely divided pulverulent polymers are used as flocculants or thickeners for aqueous systems.

REFERENCES:
patent: 2982749 (1961-05-01), Friedrich et al.
patent: 3284393 (1966-11-01), Vanderhoff et al.
patent: 3642019 (1972-02-01), Kramer et al.
patent: 3734873 (1973-05-01), Anderson et al.
patent: 3920599 (1975-11-01), Hurlock et al.
patent: 3975341 (1976-08-01), Trapasso
patent: 4059552 (1977-11-01), Zweigle et al.
patent: 4078133 (1978-03-01), Ozima
patent: 4125508 (1978-11-01), Elfers
patent: 4459396 (1984-07-01), Yamasaki et al.
patent: 4599379 (1986-07-01), Flesher et al.
patent: 4645568 (1987-02-01), Kurps et al.
patent: 4798861 (1989-01-01), Johnson et al.
patent: 5124376 (1992-06-01), Clark, Jr.
Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, NY, NY, 1987, p. 460.

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