Quaternary ammonium salts of anionic gums
AssigneeMerck & Co., Inc.
InventorGeorge T. Colegrove
Life of this patent
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Abstract
Derivatized anionic gums and compositions thereof are disclosed. The gum derivatives are prepared by reacting non-derivatized gum with quaternary ammonium compounds in an amount equal to or greater than the stoichiometric amount required for complete derivatization. The derived gums are soluble in organic solvents.
Claims7
A fully derivatized quaternary ammonium salt of an anionic gum, which is S-194 or S-130, wherein the quaternary ammonium compound contains a single alkyl or alkenyl substituent of 13-24 carbon atoms or two alkyl or alkenyl substituents of 12-24 carbon atoms per substituent, and the ethylene oxide substituted analogs thereof.
A viscous organic solvent composition comprising by weight:
- (a) 0.05-5.0% (wt) quaternary ammonium salt of xanthan gum, S-194, or S-130, wherein the quaternary ammonium compound contains a single alkyl or alkenyl substituent of 13-24 carbon atoms or two alkyl or alkenyl substituents of 12-24 carbon atoms per substituent, and the ethylene oxide substituted analogs thereof;
- and
- (b) a solvent which is one C.sub.1 -C.sub.3 alkanol, N-methyl-2-pyrrolidone, ethylene glycol, or propylene glycol with the proviso that when the solvent is an alkanol other than methanol the solvent contains 10-20% (wt) water.
A viscous organic solvent composition comprising by weight:
- (a) 0.1-2% (wt) quaternary ammonium salt of xanthan gum, S-194, or S-130, wherein the quaternary ammonium compound contains a single alkyl or alkenyl substituent of 13-24 carbon atoms or two alkyl or alkenyl substituents of 12-24 carbon atoms per substituent, and the ethylene oxide substituted analogs thereof;
- and
- (b) a solvent which is propylene glycol or C.sub.2 -C.sub.3 alkanol/water solution wherein the ratio alkanol/water is approximately 1.5:1.
Dependencies are inferred from the claim text.