Merck + Co., Inc.

Ian W Cottrell

Joseph S Racciato

John K Baird

Jaewon L Shim

Paul A Sandford

Richard A Empey

Glyoxal treated xanthan gum is dry blended with non-dispersible plant gums. These blends exhibit excellent dispersibility in water.

Dispersible xanthan gum blends

Novel copolymers of N,N-dimethylacrylamide and acrylamide are disclosed where the ratio of NNDMA to AM ranges from 10:90 to 95:5. The hydrolyzed copolymer is also disclosed where hydrolysis ranges from 5% to 65% and the ratio of NNDMA to AM is 5:95 to 95:5. These hydrolyzed copolymers are useful in enhanced oil recovery operations.

Copolymers of N,N-dimethylacrylamide and acrylamide

A blend of tamarind kernel powder and xanthan gum has been found to have a synergistically high viscosity in aqueous solution.

Novel tamarind/xanthan gum blend

This invention relates to a deacetylated borate-biosynthetic gum or a partially deacetylated borate-biosynthetic gum having improved dispersion characteristics. The invention also relates to a method of preparing such compositions.

Deacetylated borate-biosynthetic gum compositions

A series of novel amphoteric graft copolymers of xanthomonas hydrophilic colloid and partially N-aminoalkylated acrylamide has been prepared by reacting the corresponding acrylamide copolymer with an alkyl amine and an active aldehyde. The new copolymer is cationized via acidification or quaternization, and is reverted to its anionic form via basification.

Amphoteric graft copolymers of xanthomonas hydrophilic colloid and

A water-soluble anionic graft copolymer of xanthan gum and polyacrylamide wherein at least part of the amide function is sulfomethylated.

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Solana Beach, CA, United States of America

Ian W Cottrell