DE1617691B1 - Cosmetic preparations, in particular shampoos - Google Patents

Description

The present invention relates to a cosmetic agent and in particular to a shampoo containing '. a content of sulfated fatty acid alkanolamides.

It is known that the starting materials for shampoos are various; surface-active substances used. A suitable group for this purpose includes fatty alcohol sulfates in the form of their sodium or. Ammonium salts or the like, in which the alkyl radical, hereinafter referred to as R, has 12 to 18 carbon atoms contains. These sulfates correspond to one of the two following forms

RO - SO ₃ M or R - _: (O - CHaCH ₈ ) * - OSO ₃ M:

depending on whether the product is oxethylated or not (n is a number which generally lies between 1 and 4, and M is a cation, e.g. sodium or ammonium). Products of this type have a good cleaning effect, but attack the skin and mucous membranes. In addition, hair feels rough after washing with these fabrics.

Another group of surfactants contemplated for the same purpose comprises sulfated amides, which have the advantage of giving the hair a pleasant grip after washing and have less aggressiveness against the mucous membranes.

However, the sulfated amides that have become known to date do not have sufficient resistance against hydrolysis and become very quickly, i. H. after a few days, hydrolyzed to the extent that it it is necessary to prepare the solution only a short time before using it. Hence are sulfated amides Although it is suitable for the production of shampoos in powder form, it is not suitable in the form of solutions.

The invention is based on the problem of the disadvantages the fatty alcohol sulfates, namely the aggressiveness and the poor grip of the hair after Wash, eliminate and the insufficient stability, as shown by the known sulfated amides, too avoid.

The cosmetic agent according to the invention, which can be used in particular as a shampoo, contains as sulfated fatty acid alkanolamide, at least one compound of the general formula

R-CONH-CH ₂ CH ₂ -O-CH ₂ Ch ₂ -O-SO ₃ M

(J)

wherein R is a saturated or unsaturated alkyl radical derived from coconut oil fatty acids and having 11 to 17 carbon atoms and M is an alkali metal, ammonium or one substituted by a lower alkyl radical Ammonium means, preferably the ammonium salt. The cosmetic agent according to the invention lies Expediently in an aqueous solution before and, if necessary, others which are customary in cosmetics can also be used Additives such as thickeners or other known ionic or non-ionic surface-active substances, contain.

The cosmetic agent according to the invention generally contains 5 to 20%, preferably about 10% of the compounds of the above general formula. The pH of the agent according to the invention is expediently between 6 and 9 and preferably around 7.

It was surprisingly found that the compounds corresponding to the formula are well resistant to hydrolysis, so that they can be used in the production of shampoos in the form of aqueous Solutions can be used. It should be noted that the stability of the inventively producible Amide sulfates cannot be derived from the stability of the corresponding amides, as it is It is entirely possible that an amide is resistant to hydrolysis, but its sulfates are not.

The high.Stabilitat.der according to the invention Compounds against hydrolysis which can be prepared by methods are particularly evident from those listed below Try out.

The hydrolyzed proportions were determined as a function of time for a known amide sulphate (more precisely in the case of a sodium salt of the sulfuric acid ester of coconut fatty acid amidoethanol) and an amide sulphate obtainable by the process according to the invention. The two Amidsulfate were investigated as l% aqueous solutions at a pH value of 9 and a temperature of 75 ⁰ C. The method described by Desnuelle and Micae 11 i in the review "Oleagineux", No. 6, 1969, pp. 353 to 357 and 720 to 725, was used for the analysis.

The results obtained are from the following See table:

Try with B Try with B. Time RCONH-CH ₂ CH ₂ - O - SO ₃ Na 76 RCONHCH ₂ CH ₂ OCH ₂ CH ₂ OSO ₃ Na 87 in hours (R = one shade of coconut oil fatty acid derived alkyl radical) 66.5. . (R = an alkyl radical derived from coconut oil fatty acids) 87 - .., .. A. 55 A. 87 2V2 24 13th 4th 33.5 13 -. 6th 45 13th

A = percentage of chain alkyl radicals associated with unsulfated molecules.
B = percentage of chain alkyl radicals associated with sulfated molecules.

The analysis results were determined by the method The table shows that the known amide sulfate

verified by Desnuelle and M i c a e 11 i, 65 changes considerably within 6 hours while

by passing the products through an ion exchange column only the amide sulfate obtainable according to the invention

were sent. The same results were obtained - little is hydrolyzed,

nits received. Besides the advantage that the

According to the method that can be produced, the hair is very pleasant to the touch when washing Provide grip, they also do not attack the mucous membranes, in particular they also irritate not the mucous membranes of the eyes, as experiments on live rabbits have shown. Also are these compounds are easily biodegradable.

The compounds corresponding to the above formula are obtained in such a way that a coconut oil fatty acid of the formula RCOOH, in which R is a saturated or unsaturated alkyl radical with 11 to 17 carbon atoms, with /? - [j? '- oxyethoxy] ethylamine (HO · CH ₂ · CH ₂ · O · CH ₂ · CH ₂ · NH ₂ ), hereinafter referred to as “diglycolamine” for short, is converted and the hydroxyl group of the acid amide obtained in this way is sulfated. If necessary, the sulfation is followed by conversion into a salt.

example 1

The following mixture is produced:

Sulfuric acid ester of coconut oil fatty acid diglycolamide in the form of the ammonium salt (26.8%) 40 g

Lauryl diethanolamide 4 g

Make up to 100 cm ^{3 with water}

Example 2

The following mixture is produced:

Sulfuric acid ester of coconut oil fatty acid diglycolamide in the form of am-

monium salt (26.8%) 20 g

Ammonium lauryl sulfate 15 g

Lauryl diethanolamide 3.5 g

Make up to 100 cm ^{3 with water}

Example 3

The following mixture is produced:
Sulfuric acid ester of coconut oil fatty acid diglycolamide in the form of the ammonium salt (26.8%) 25 g

With 12 moles of ethylene oxide polyethoxy-

lated lauryl alcohol 5 g

Lauryl diethanolamide 4 g

Make up to 100 cm ^{3 with water}

Each of the preparations given in Examples 1 to 3 showed when used in the usual way As a shampoo, it has a good cleaning effect, as well as good foam formation and a pleasant one Foam consistency. The hair treated with it is smooth, shiny and pleasant to the touch.

Claims (3)

Patent claims: 1. Cosmetic agents, in particular shampoos, with a content of sulfated fatty acid alkanolamides, characterized in that it is a sulfated fatty acid alkanolamide at least one compound of the general formula R-CONH-CH ₂ CH ₂ -O-CH ₂ Ch ₂ -O-SO ₃ M wherein R is a derived from coconut oil fatty acids saturated or unsaturated alkyl radical with 11 to 17 carbon atoms and M is an alkali metal, ammonium or a lower alkyl radical Substituted ammonium means, preferably the ammonium salt, contains. 2. Cosmetic agent according to claim 1, characterized in that it is 5 to 20%> preferably 10% of compounds of the formula according to Claim 1. 3. Cosmetic agent according to claim 1 or 2, characterized in that it has a pH from 6 to 9, preferably from 7, has.