The Dow Chemical Company

Jack C Lamphere

Maurice L Zweigle

Yohannes Chonde

Frederick W Stanley, Jr

Larry R Wilson

James P Easterly, Jr

Henry Volk

Frederick W Stanley, Jr, Deceased

William C Foshee

Wrinkled absorbent particles of high effective surface area having fast

A suspending agent useful in a water-in-oil suspension polymerization process comprises a fumed silica particulate having a hydrophobic character and a hydrophobic polymer. The suspending agent is useful in providing uniformly sized aqueous fluid absorbent polymer beads.

Suspending agent for the suspension polymerization of water-soluble

Coal liquors are clarified by contacting them with high molecular weight copolymers of from about 70 to about 99 mole percent of a nonionic water-soluble monomer such as acrylamide and from 1 to 30 mole percent of a cationic monomer such as methacryloylethyl trimethyl ammonium chloride or methacrylamidopropyl trimethyl ammonium chloride.

Coal liquor clarification with water-soluble, high molecular weight

Discrete, spheroidal microgels of a water-swollen or water-swellable, cross-linked polymer such as cross-linked polyacrylamide are particularly useful as thickening agents for aqueous dispersions to be subjected to high shear and as agents for reducing the permeability of porous structures.

Cross-linked, water-swellable polymer microgels

A stable, water-in-oil emulsion of a partially hydrolyzed carboxamide polymer is prepared by contacting a water-in-oil emulsion of an inherently water-dispersible polymer containing carboxamide groups, e.g., polyacrylamide, with a water-in-oil emulsion of a hydrolyzing agent such as sodium hydroxide. By emulsifying the hydrolyzing agent prior to hydrolysis, the hydrolysis reaction can be carried out over a wider range of reaction conditions such as temperature and the like without destroying the water-in-oil emulsion of the polymer.

Process for hydrolyzing water-soluble carboxamide polymers

Cross-linked water-swellable polymers are described, having a particle size of less than 4 microns. They are used as thickening agents for aqueous dispersions or solutions, particularly useful where high shear conditions are encountered in the application.

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Midland, MI, United States of America

Jack C Lamphere