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US 7,410,940 B2Granted
Antioxidants for the stabilization of surfactant formulations
AssigneeCiba Specialty Chemicals Corporation
InventorsDietmar Hüglin, Erich Kramer
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Abstract
The invention relates to cleaning compositions comprising (a1) a phenolic antioxidant of the formula (1) and/or (2); and/or (a2) an antioxidant of the formula (3); and (b) a surfactant comprising a long alkyl or alkenyl chain. The antioxidants used according to the invention have excellent reactivity, good stability to hydrolysis, particularly in an alkaline medium, and, because of their solubility, can be easily incorporated into the soap formulations.
Claims11
A method of stabilizing a surfactant comprising a long alkyl or alkenyl chain, comprising adding thereto an effective stabilizing amount of
- (a2) an antioxidant of the formula
- in which in the formulae (3)
- R1 is hydrogen;
- C1-C22 alkyl;
- C1-C22 alkylthio;
- C5-C12 cycloalkyl;
- phenyl;
- or C7-C9 phenylalkyl;
- R2 is C1-C22 alkyl;
- C5-C12 cycloalkyl;
- phenyl;
- C7-C9 phenylalkyl;
- or —SO3M;
- a is 0;
- 1;
- or 2;
- M is hydrogen;
- alkali metal;
- or ammonium;
- and
- R4 and R5 independently of one another are hydrogen;
- or C1-C22alkyl
- wherein the component (a2) is present in a concentration of from 50 to 1000 ppm based on weight of the surfactant.
20 more elements
Dependencies are inferred from the claim text.