Merck + Co., Inc.

Kelco Company

Danny D Richey

George T Veeder

Kenneth S Kang

Walter Gregory Rakitsky

A rapidly hydrating welan gum useful for preparing cementitious products. The gum can be dry blended with cement or other dry component and then added to a preformed cement/water pre-mix, thereby alleviating the need for hydrating the gum prior to addition to a cement/water mixture.

Rapidly hydrating welan gum

A process for producing a heteropolysaccharide by a bacterial fermentation procedure in which a species of bacteria or a mutant thereof is incubated in a fermentation medium which contains a carbon source, preferably a hydrolyxed starch, a source of magnesium ions, a source of phosphorous, a source of nitrogen and water with the incubation taking place at a temperature of about 28.degree. to about 35.degree. C.

Polysaccharide and bacterial fermentation process for its preparation

Aqueous polysaccharide composition

A process for producing a heteropolysaccharide by a bacterial fermentation procedure in which a new species of bacteria is incubated in a fermentation medium which contains a carbon source, preferably a hydrolyzed starch, a source of magnesium ions, a source of phosphorous, a source of nitrogen and water with the incubation taking place at a temperature of about 28.degree. to about 35.degree.C. The heteropolysaccharide produced by the above fermentation process. A thickened aqueous media containing an effective quantity of the heteropolysaccharide to thicken the media.

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San Diego, CA, United States of America

Danny D Richey