Drug – bio-affecting and body treating compositions – Live hair or scalp treating compositions – Two or more designated surfactant containing
Patent
1992-12-23
2000-05-02
Page, Thurman K.
Drug, bio-affecting and body treating compositions
Live hair or scalp treating compositions
Two or more designated surfactant containing
424401, 424 7021, 424 7022, 424 7024, 424 7027, 424 7028, A61K 600, A61K 700, A61K 706
Patent
active
060569484
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a new extra-mild shower gel and hair shampoo formulation with low tenside concentration.
The production quantity of shower baths and hair shampoos in the cosmetics industry in Germany is currently about 110,000 tonnes per year. The tenside content of the commercially available products here is between 15 and 25%. About 20,000 tonnes per year of tensides thus pass into waste waters, where they are degraded more or less quickly and completely. A reduction in the washing-active substances is an aim worth pursuing from both the economic and the ecological aspect.
It is known that certain tensides, and thus also those containing ether-sulfates, having a very pronounced foam formation allow a drastic reduction in washing-active substances from, for example, 20% to 10%, but therefore, in contrast to other tensides, cause a lower viscosity of the mixture. The decrease in viscosity which occurs must be compensated by electrolyte additions (NaCl, Na.sub.2 SO.sub.4) which pollute the waste waters, or organic thickeners which additionally pollute the waste water. The salt load easily exceeds the tenside concentration here, which significantly increases on the one hand the risk of burning of the eyes, and on the other hand the instability (salting out effect).
There was therefore the object of discovering a mild tenside combination for skin and hair care which contains ether-sulfate and has good foaming properties, with which highly viscous formulations can be prepared at tenside concentrations of less than 10% with a minimum of electrolyte salts and without additional thickeners. The products furthermore should have a good biological degradability, so that they do not pollute the environment.
Surprisingly, this object is achieved or promoted by the features characterized in more detail in the claims.
It is known from the earlier application, which has not previously been published, P 39 10 652.7 that a tenside combination of lauryl polyglycol ether-carboxylate, lauryl sulfate and lauric acid amidopropylbetaine can be processed with 2-10% of sodium chloride to give a shower gel which is tolerated well. The lauryl glycol ether-carboxylate used here had a degree of ethoxylation of 8-10 ethoxy groups. In order to produce adequate foaming properties, a total tenside concentration of 15-20% was necessary. 4.5% of NaCl was added to adjust the viscosity.
Alkyl ether-carboxylic acids having a lower degree of ethoxylation (2-5) are not employed in body cleansing agents, in spite of their good tenside action, because of the eye and skin irritations which thereby occur (Seifen, Ole, Wachse (1983) pages 353-355).
Surprisingly, the alkyl ether-carboxylic acids having a low degree of ethoxylation (2-5), which are more aggressive when used by themselves, no longer exhibit skin irritations in the combination according to the invention, and have such a high foam formation capacity that total tenside concentrations of less than 10% are possible.
Alkyl polyglycol ether-carboxylic acids in the context of the invention are compounds of the formula I in particular 12-14 C atoms, and n denotes a natural number from 2 to 5, preferably 2.5. The carboxylic acids are preferably neutralized with sodium, potassium or ammonium ions, in particular tris(hydroxymethyl)aminomethane.
During customary preparation of the compounds I by polycondensation of fatty alcohols with ethylene oxide (ethoxylation) and subsequent reaction with monochloroacetic acid, mixtures are formed which are separated only roughly, if at all, for use as a tenside. The number n is therefore to be understood as the mean value of the compounds contained in the mixture. The mixture can also still contain certain amounts of unreacted fatty alcohol ethoxylates.
Alkyl ether-sulfates in the context of the invention are ethoxylated sulfuric acid monoalkyl esters which are derived from fatty alcohols which are well-known as tensides, and have particularly good foaming properties under hard water conditions.
The degree of ethoxylation is on average 2-8, pre
REFERENCES:
patent: 3990991 (1976-11-01), Gerstein
patent: 4148762 (1979-04-01), Koch
patent: 4329334 (1982-05-01), Su
patent: 4490355 (1984-12-01), Desai
patent: 4670253 (1987-06-01), Ploog
patent: 4900544 (1990-02-01), Ritter
Paassen, "Alkylethercarboxylate: Hautfreundliche Rohstoffe fur kosmetische Anwendungen", Seifen, Ole, Wachse (1983) pp. 353-355. (ul. at p. 2 of spec.--No translation).
Baust Heinrich
Waeschenbach Guido
Benckiser N.V.
Howard Sharon
Page Thurman K.
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