Hair treatment preparations
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsHorst Hoeffkes, Fritz Lange, Karl Giede
Life of this patent
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Abstract
Aqueous hair treatment preparations containing as anionic surfactant an alkylether sulfonate corresponding to the following formula R.sup.1 --O--(C.sub.n H.sub.2n O).sub.x --(CH.sub.2).sub.y --SO.sub.3 (-)M(+) in which R.sup.1 is a C.sub.8 -C.sub.18 alkyl group, n=2 or 3, x=0 to 20, y=1 to 3 and M(+) is an alkali metal ion. Alkylether sulfonates such as these show high foaming power, are easy to thicken and are stable to hydrolysis in acidic medium. They can be prepared by reaction of corresponding alkylether sulfates with sodium sulfite in aqueous solution and extraction from the reaction mixture with a saturated C.sub.4 -C.sub.6 alcohol.
Claims9
In an aqueous hair treatment composition containing an anionic surfactant, the improvement wherein the anionic surfactant is an alkylether sulfonate of the formula
- R.sup.1 --O--(C.sub.n H.sub.2n O).sub.x --(CH.sub.2).sub.y --SO.sub.3.sup.(-) M.sup.(+) (I)
- in which R.sup.1 is a C.sub.8 -C.sub.18 alkyl group, n=2 or 3, x=0 to 20, y=1 to 3 and M.sup.(+) is an alkali metal ion.
A process for the preparation of an alkylether sulfonate of the formula:
- R.sup.1 --O(C.sub.n H.sub.2n O).sub.x --(CH.sub.2).sub.y --SO.sub.3.sup.(-) M.sup.(+) (I)
- in which R.sup.1 is a C.sub.8 -C.sub.18 alkyl group, n=2 or 3, x=0 to 20, y=2 and M.sup.(+) is the sodium ion, comprising the steps of:
- A. reacting an alkylether sulfate of the formula
- R.sup.1 --O(C.sub.n H.sub.2n O).sub.x --(CH.sub.2).sub.2 --O--SO.sub.3.sup.(-) Na.sup.(+)
- with sodium sulfite under pressure at a temperature in the range of from about 150.degree. to about 250.degree. C. in aqueous solution with from about 1.4 to about 4.0 moles of sodium sulfite per mole alkylether sulfate, and B. extracting the alkylether sulfonate of formula I from the reaction mixture with a saturated C.sub.4 -C.sub.6 alcohol.
Dependencies are inferred from the claim text.