Citric esters of polyhydroxy compounds and use thereof in detergents
AssigneeBASF SE
InventorsElisabeth Kappes, Alfred Oftring, Richard Baur, Alexander Kud, Dieter Boeckh, Heinrich Hartmann, Volker Schwendemann
Life of this patent
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Abstract
Esters of citric acid or acetylcitric anhydride with compounds of at least 3 OH groups selected from the group consisting of polyglycerol, sugarcarboxylic acids, alkyl glucosides, derivatives of oligosaccharides, aminosorbitol, aminodisorbitol, glucosamine, triethanolamine and trishydroxyethylmelamine, each OH group of the alcohol component of the esters being esterified on average with from 0.15 to 1 molecule of citric acid or acetylcitric anhydride, are useful as additives in low-phosphate or phosphate-free detergents.
Claims10
A detergent composition comprising a surfactant selected from the group consisting of anionic and nonionic surfactants, and from 0.1 to 30% by weight of at least one builder, said builder comprising a citric acid ester prepared by esterifying
- (a) citric acid or acetylcitric anhydride with
- (b) a compound of at least 3 OH groups selected from the group consisting of sugarcarboxylic acids, C.sub.2 -C.sub.4 -alkylglucosides, hydroxy-C.sub.2 -C.sub.4 -alkyl glucosides, carboxyl group containing oxidation products of oligosaccharides which contain up to 4 monosaccharide units,
- aminosorbitol, aminodisorbitol, glucosamine, N-acetylglucosamine and trishydroxyethylmelamine, wherein each OH group of compound (b) has an average esterification of 0.15 to 1 with a compound (a).
An ester of citric acid or acetylcitric anhydride and a polyhydroxy compound, which ester is the esterification reaction product of (a) citric acid or acetylcitric anhydride with (b) a compound of at least 3 OH groups selected from the group consisting of C.sub.2 -C.sub.4 -alkylglucosides, hydroxy-C.sub.2 -C.sub.4 -alkylglucosides, carboxyl group containing oxidation products of oligosaccharides which contain up to 4 monosaccharide units, aminosorbitol, aminodisorbitol, glucosamine, acetylglucosamine and trishydroxylethylmelamine, wherein each OH group of compound (b) has an average esterification of 0.15 to 1 with a compound (a).
A sodium salt of an ester of citric acid or acetylcitric anhydride and a polyhydroxy compound, which ester is the esterification reaction product of (a) citric acid or acetyl citric anhydride with (b) a sugarcarboxylic acid containing at least 3 OH groups, wherein each OH group of the sugarcarboxylic acid has an average esterification of 0.15 to 1 with a compound (a).
Dependencies are inferred from the claim text.