Merck + Co., Inc.

Glen H Best

Thomas A Lindroth

Floyd L Allen

Suzanne M Steenbergen

Cement compositions, i.e., mortar, structured concrete, pre-cast concrete, and oilfield cement, comprising 0.01-0.9% (wt/wt) welan gum are described.

Welan gum in cement compositions

Low viscosity welan gum having a 5% (wt.) aqueous solution viscosity of 100 cP and process for preparation of such are described.

Heteropolysaccharide S-421, prepared by fermentation of an unidentified Agrobacterium species ATCC 53378, has valuable properties as an acid stable heteropolysaccharide and is especially valuable for use in acidizing fluids.

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San Diego, CA, United States of America

Glen H Best