Sulfosuccinate, alkyl- and alkenyl sulfosuccinate, sulfomaleate, and disulfosuccinate half-esters of polygalactomannans
AssigneeNational Starch and Chemical Corporation
InventorsMartin M. Tessler, Teresa A. Dirscherl, Otto B. Wurzburg
Life of this patent
Estimating the term…
Abstract
Sulfosuccinate polygalactomannan half-esters, as well as the alkyl- and alkenyl-sulfosuccinates thereof, are prepared by reacting the gum with sulfosuccinic anhydride or a C.sub.1 -C.sub.22 -alkyl- or C.sub.3 -C.sub.22 -alkenyl sulfosuccinic anhydride. The reactions are carried out at about pH 7.5 in a two-phase system of solid gum slurried in an aqueous medium containing a water-miscible solvent. Sulfomaleate half-esters are prepared in a similar manner using sulfomaleic anhydride. Disulfosuccinate half-esters are prepared by reacting the sulfomaleate gum half-ester with sulfurous acid or a bisulfite salt such as sodium bisulfite.
Claims20
A polygalactomannan gum derivative, comprising a gum sulfosuccinate half-ester of the general structure:
- ##STR7## or mixtures of (i) and (ii), wherein Gum-O- represents a gum molecule or a modified gum molecule;
- R is hydrogen or a C.sub.1 -C.sub.22 straight or branched chain alkyl group or mixtures thereof, a C.sub.3 -C.sub.22 straight or branched chain alkenyl group or mixtures thereof, or a mixture of the alkyl and alkenyl groups;
- M is a cation;
- and n is the valence of M.
A polygalactomannan gum derivative, comprising a gum sulfomaleate half-ester of the general structure:
- ##STR8## or mixtures of (iii) and (iv), wherein Gum-O- represents a gum molecule or a modified gum molecule, M is a cation, and n is the valence number of M.
A polygolactomannan gum derivative, comprising a gum disulfosuccinate half-ester of the general structure:
- ##STR9## or mixtures of (v), (vi), and (vii);
- wherein Gum-O- represents a gum molecule or a modified gum molecule, M is a cation, and n is the valence number of M.
Dependencies are inferred from the claim text.