Drug – bio-affecting and body treating compositions – Dentifrices – Organic sulfate or sulfonate containing
Patent
1994-03-28
1995-08-08
Hollrah, Glennon H.
Drug, bio-affecting and body treating compositions
Dentifrices
Organic sulfate or sulfonate containing
252332, 252353, 424401, 562110, 562 36, A61K 716
Patent
active
054396719
DESCRIPTION:
BRIEF SUMMARY
this application is a 371 of PCT/EP92/02073, filed Sep. 8, 1992.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a process for the production of neutral-tasting pastes of alkyl ether sulfates in glycerol.
2. Statement of Related Art
In contrast to alkyl sulfates, alkyl ether sulfates have hardly ever been used in toothpastes on account of their unpleasant taste and aftertaste.
It is known from German patent application DE 30 44 481 that 1,4-dioxane can be removed from water-containing pastes of alkyl ether sulfates in admixture with water by azeotropic evaporation. DE-OS 34 47 867 describes a process for the removal of 1,4-dioxane from alkyl ether sulfates, in which an ethoxylated silicone oil is added to the water-containing surfactant paste for defoaming purposes and steam is subsequently passed through the resulting mixture. These processes give water-containing pastes of alkyl ether sulfates which, by virtue of their reduced 1,4-dioxane content and the lower danger potential resulting therefrom, may be used with advantage in detergents and cleaning preparations.
However, distillation-based operations involving water-containing alkyl ether sulfate pastes of relatively high concentration are complicated by the presence of gel phases. Accordingly, there is a need for processes which enable unwanted secondary products to be removed from alkyl ether sulfate pastes. These secondary products are only present in low concentrations and, as in the case of taste-forming or odor-emitting substances for example, are generally not known in their entirety.
DESCRIPTION OF THE INVENTION
The problem addressed by the present invention was to provide a process for the production of neutral-tasting pastes of alkyl ether sulfates.
According to the invention, this problem has been solved by a process for the production of neutral-tasting pastes of alkyl ether sulfates in glycerol, in which
to 75% by weight of an alkyl ether sulfate in a 1-to 4-fold excess by weight, based on the aqueous alkyl ether sulfate paste, and the water present is distilled off substantially completely from the mixture at elevated temperature and mixture obtained in this way with intensive whirling of the liquid and steam phases.
In the context of the invention alkyl ether sulfates are the sulfates of adducts of ethylene oxide (EO) and/or propylene oxide (PO) with saturated and/or unsaturated, linear and/or branched fatty alcohols obtainable by known methods. The fatty alcohols on which the alkyl ether sulfates are based may be pure compounds. However, it is normally preferred to use mixtures of different fatty alcohols obtained from native raw materials, such as fats and oils. These fatty alcohols may be reacted with the alkylene oxides, for example under pressure and in the presence of catalysts, to form fatty alcohol alkoxylates.
It may stated with regard to the degree of alkoxylation that alkoxylation reactions such as, for example, the addition of x moles of ethylene oxide onto 1 mole of fatty alcohol by known methods of ethoxylation do not give an adduct per se, but rather a mixture of residues of free fatty alcohol and a number of homologous (oligomeric) addition products of 1, 2, 3, . . . x, x+1, x+2 . . . etc. molecules of ethylene oxide per molecule of fatty alcohol. The average degree of ethoxylation (x) is defined by the starting quantities of fatty alcohol and ethylene oxide. The distribution curve of the homolog mixture generally shows a maximum in the range from x-3 to x+3. Further information on this subject can be found, for example, in the Journal Soap/Cosmetics/Chemical Specialties, Jan. 1988, page 34.
The desired alkyl ether sulfates are ultimately obtained by reaction of the fatty alcohol alkoxylates with, for example, sulfur trioxide or chlorosulfonic acid and subsequent neutralization, for example with alkali metal, alkaline earth metal, aluminium or ammonium hydroxides.
Preferred alkyl ether sulfates are compounds corresponding to formula (I): C.sub.8-22 alkyl radical, n is the number 2 or
REFERENCES:
patent: 3893940 (1975-07-01), Ohogoshi et al.
patent: 4411815 (1983-10-01), Ando et al.
patent: 5362479 (1994-08-01), Breitzke et al.
Soap/Cosmetics/Chemical Spec. for Jan. 1988, p. 34.
Ansmann Achim
Breitzke Willi
Gantke Karl-Heinz
Drach John E.
Henkel Kommanditgesellschaft auf Aktien
Hollrah Glennon H.
Jaeschke Wayne C.
Millson Jr. Henry E.
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