Drug – bio-affecting and body treating compositions – Live hair or scalp treating compositions – Cationic surfactant containing
Patent
1994-12-19
1998-02-17
Gardner-Lane, Sally
Drug, bio-affecting and body treating compositions
Live hair or scalp treating compositions
Cationic surfactant containing
424 701, 514506, 514642, A61K 706, A61K 700
Patent
active
057188912
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This application claims priority to PCT/EP93/03152 Nov. 10, 1993 under 35 USC 371 and a priority to Mar. 18, 1993 under 35 USC 119.
1. Field of the Invention
This invention relates to solid esterquats with improved dispersibility in water which are obtained by quaternizing fatty acid triethanolamine esters in the presence of dispersants and optionally emulsifiers, to hair-care preparations containing these compounds and to the use of the compounds for the production of hair-care preparations.
2. Statement of Related Art
Damage to the structure of hair is caused by frequent bleaching, permanent waving, dyeing, over exposure to UV light, washing with degreasing surfactants and normal ageing. The hair becomes brittle and loses its shine. In addition, the hair develops an electrostatic charge on combing while the roughened surface of the hair gives rise to matting and knotting so that the hair becomes difficult to comb. Accordingly, hair-care preparations with a combability-improving effect have acquired considerable significance in the cosmetics field. Preparations such as these may be applied to the hair still wet from washing in the form of a rinse, an aerosol foam or even in the form of emulsions (cream rinses) and may either be rinsed out after a contact time of a few minutes or may be left on the hair.
Cationic surfactants, more particularly quaternary ammonium compounds, such as for example distearyl dimethylammonium chloride (DSDMAC), either on their own or in combination with various wax-like additives, such as hydrocarbons, fatty alcohols or fatty acid esters, have been successfully 157 (1975)!. Unfortunately, the cationic surfactants mentioned have the disadvantage of inadequate biodegradability so that, on introduction into surface waters, they can gradually impair the viability of aquatic biocenoses.
In addition, German patent application DE-A1 35 27 974 describes esters of betaine with fatty alcohols or fatty alcohol polyglycol ethers for use in acidic hair-care preparations. Although the betaine esters show high ecotoxicological compatibility, they are unsatisfactory in regard to improving combability, antistatic behavior, feel and rinsing behavior and, in addition, are not stable to hydrolysis at acidic pH values.
In their earlier German patent application DE-A1 41 38 630, applicants proposed using quaternized fatty acid triethanolamine ester salts, so-called "esterquats", as cationic surfactants in acidic hair-care preparations. However, it was found in practice that both the dispersibility of these products in water and their stability in storage are not always entirely satisfactory.
Accordingly, the problem addressed by the present invention was to provide a process for the production of esterquats with improved dispersibility in water and higher stability in storage which could be used with advantage in hair-care preparations.
DESCRIPTION OF THE INVENTION
The present invention relates to a process for the production of solid esterquats with improved dispersibility in water, in which fatty acid triethanolamine esters are quaternized with alkylating agents in known manner in the presence of acid monoglycerides and dialkyl ethers and optionally polyglycol ethers, fatty acid monoglyceride polyglycol ethers, fatty acid oligoglyceride polyglycol ethers, polysorbates and alkyl oligoglucosides.
It has surprisingly been found that the quaternization of fatty acid triethanolamine esters can also be carried out in the presence of the dispersants and, optionally, emulsifiers mentioned above. Solvent-free and, in particular, alcohol-free, solid esterquats readily dispersible in water are obtained in this way. The invention includes the observation that the subsequent addition of the dispersants mentioned to conventionally produced esterquats improves dispersibility in water only very slightly, if at all. Another advantage is that aqueous solutions of the esterquats obtainable by the process according to the invention are particularly stable in storage, i.e. remain homogen
REFERENCES:
patent: 5494659 (1996-02-01), Salka et al.
Parf. Kosm. 56, 157 (1975).
C.R. CED Congress, Barcelona, 167 (1992).
C.R. CED Congress, Sitges, 59 (1993).
Bull. soc. Chim. France, 333 (1949).
Bigorra Joaquim
Prat Esther
Drach John E.
Gardner-Lane Sally
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Millson Jr. Henry E.
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