E.i. Dupont De Nemours and Company

Lionel S Sandell

Robert David Wysong

Mark James Marquisee

William L Geigle

Lloyd Abrams

Water-dispersible granular agricultural compositions made by heat

Water-dispersible or water-soluble pesticide grandules from

The process of making a solution formulation of a sulfonylurea compound which includes contacting the formulation with molecular sieves to provide improved chemical stability to the solution formulation.

Process for preparation of sulfonylurea solution formulations

Thickeners, preferably galactomannans, in aqueous solutions or slurries, e.g., water gel explosives, oil well drilling muds, and hydraulic fracturing fluids, are stabilized against thermal degradation by incorporating iodide and/or iodate ions in the solution or slurry. The preferred stabilizer is the iodide ion introduced into the fluid by dissolving an alkali metal or alkaline-earth metal iodide, or ammonium or alkyl-substituted ammonium iodide, in the aqueous phase.

Stabilization of thickened aqueous fluids

Water-bearing explosives comprising oxidizer, fuel, and sensitizer components in a thickened or gelled continuous aqueous phase are stabilized against the degradation of their thickened or gelled structure by the incorporation therein of iodide and/or iodate ions. Preferably, iodide ion is introduced by dissolving ammonium iodide or an alkali metal iodide in an aqueous liquor or sol containing the oxidizer component. The stabilization method is particularly useful in explosives containing a guar gum thickener and flake aluminum in the sensitizer component.

Stabilization of water-bearing explosives having a thickened continuous

Process for preparing pigmented microporous silica microspheres by spraying an aqueous suspension of pigment in a solution of alkali metal silicate through the air into a medium consisting of from 20% to 100% by volume of a water miscible organic liquid, the balance being water. The resulting microspheres are highly effective opacifying agents.

Pigmented microporous silica microspheres by spray processes

Pigmented silica microsphere having an average diameter from 2 .mu.m to 100 .mu.m and consisting essentially of from 10% to 70% by weight of particulate pigment, dispersed throughout a microporous silica matrix and, optionally, containing a coating of dense amorphous silica. The microspheres are produced by acidifying a water-in-oil emulsion. The pigmented silica microspheres are particularly useful as opacifying agents for coating compositions and as fillers for paper.

Pigmented microporous silica microspheres

Pigmented silica microspheres having an average diameter from 2 .mu.m to 100 .mu.m and consisting essentially of from 10% to 70% by weight of particulate pigment, dispersed throughout a microporous silica matrix and, optionally, containing a coating of dense amorphous silica. The microspheres are produced by acidifying a water-in-oil emulsion. The pigmented silica micropheres are particularly useful as opacifying agents for coating compositions and as fillers for paper.

Pigmented microporous silica microspheres produced by a water in oil

Vesiculated silica microspheres having an average diameter from 0.5.mu. to 50.mu., a maximum vesicle diameter less than 50.mu. and a volume of vesicles from 5 to 95% of the total volume of the microspheres, produced by acidifying an oil-in-water-in-oil emulsion prepared by a double emulsion technique. The vesiculated silica microspheres are particularly useful as opacifying agents for coating compositions and as fillers for paper.

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Wilmington, DE, United States of America

Lionel S Sandell