CH627644A5 - Alkaline bleaching composition based on a mixture of hydrogen peroxide and persulphate - Google Patents

Description

The invention relates to an improved alkaline bleaching mixture containing hydrogen peroxide and persulfate and containing a substantive blue dye mixture.

The use of hydrogen peroxide-containing preparations for bleaching hair is generally known. The lightening effect of the preparations containing hydrogen peroxide can be considerably increased by adding persulfates.

Since the natural color pigments of the hair, which produce the red or yellow shades of the hair, are less easy during the bleaching process than those for the brown or Pigments that contribute to black tones can leave an undesirable red or yellow tinge after bleaching, especially of darker hair. This problem can be countered by using blue dyes which, with the yellow or red color of the hair, provide a brown or platinum blonde color that is desirable for many. The hair can be beautified with the blue dye without any problems using a separate dyeing process.

However, since the treatment in a separate dyeing process means additional work, time and costs, efforts were made early on to eliminate the special dyeing process and to put the bleaching and tinting in one operation.

If only a moderate degree of lightening is desired when bleaching, a bleaching mixture can be used which contains only alkaline hydrogen peroxide without the addition of persulfate. In this case, a whole series of direct blue dyes can be incorporated into the bleaching composition without difficulty. The stability of most of the blue dyes customary for hair coloring is sufficiently high so that they are not destroyed by this bleaching mixture during the bleaching process.

The same possibility of bleaching and tinting in one step is of course also desirable when using a very heavily bleaching mixture of hydrogen peroxide and persulfate. However, all efforts in this regard failed due to the instability of the blue dyes previously used for hair dyeing purposes in relation to the extraordinarily strongly oxidizing mixture of hydrogen peroxide and persulfate in an alkaline environment.

It has now surprisingly been found that alkaline bleaching mixtures based on mixtures of hydrogen peroxide and persulfates containing (2'-methyl-4 '- (N-ethyl-Nm-sulfobenzyl) amino-4 "- (N- diethyl) -amino-2-methyl-N-ethyl-Nm-sulfobenzyl-fuchsonimo-nium (brilliant blue R 28032 ex. conc., Color Index No. 42 735) and (l, 5-di- (4 ' -methyl-2'-sulfophenylamino) anthraquinone (lilac color R 5283, Color Index No. 61 710) meet the requirements in an excellent manner.

Such a dye combination remains stable for a long time in the extremely strongly oxidizing alkaline mixture of hydrogen peroxide and persulfate, is well absorbed on the hair and thus proves to be perfect for bleaching the hair when bleaching with a hydrogen peroxide / persulphate mixture in one operation extremely well suited.

The proportion of the two dyes brilliant blue R 28032 ex. conc. and lilac color R 5283 in the dye mixture can vary within wide limits in the weight ratios from 1: 9 to 9: 1, depending on the desired tinting effect. The weight ratio of brilliant blue R 28032 ex has proven to be the cheapest mixture to achieve the most appealing effect. conc. proven to 2: 1 to lilac color R 5283.

The amount of the dye combination to be used is generally 0.015 to 0.3 percent by weight, based on the bleaching mixture, depending on the desired tinting effect. Preferred weight ratios, especially when using the components brilliant blue R 28032 ex. conc. and lilac color R 5283 in a weight ratio of 2: 1 are 0.03 to 0.12 percent by weight, based on the bleaching mixture.

As a bleaching component, the bleaching mixture according to the invention preferably contains hydrogen peroxide in an amount of 1 to 10 percent by weight, preferably 2 to 6 percent by weight, based on the entire bleaching mixture. The hydrogen peroxide can also be replaced by the corresponding amount of a per-compound which releases hydrogen peroxide when dissolved in water, e.g. the water-soluble alkali metal peroxides, alkaline earth metal peroxides, urea peroxide, melamine perhydrate and others.

The amount of persulfates, such as ammonium peroxydisulfate, potassium peroxydisulfate or sodium peroxydisulfate, which also act as bleach boosters, is generally within the range from 2 to 45 percent by weight, preferably 5 to 40 percent by weight, based on the total bleaching mixture.

In order to ensure easy handling, suitable bleaching agents are added to the bleaching mixtures, which give the products a cream-like consistency. The products previously used for this purpose, such as Calcium carbonate, magnesium carbonate, talc, kaolin, bentonite, sodium metasilicate, carboxymethyl cellulose, higher fatty alcohols, in amounts of 1-8 percent by weight, based on the entire bleaching mixture. In addition to the thickeners, wetting agents, solvents, carbonate or phosphate buffers to stabilize the pH, and fragrances in the usual amounts can also be added to the products.

The bleaching mixture is preferably made alkaline by means of ammonia, but can also be carried out by other compounds with a basic reaction. The pH of the mixture is expediently set to values in the range from 8-11 and should not exceed 12. They can be used in the usual way at a temperature of 10-40 ° C.

Examples

1. Bleaching mixture based on a cream.

First, a cream is made from the following ingredients:

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627 644

Parts by weight

Cetyl stearyl alcohol 11.0

Lauryl sulfate 12.0 ammonium sulfate 1.0 brilliant blue R 28032 ex. conc. 0.06 lilac color R 5283 0.03

Ammonia conc. 14.0 perfume oil 1.0

Water 60.7

To produce the bleaching mixture, 50 g of the aforementioned cream are mixed with 50 g of a weight percent hydrogen peroxide solution and 14 g ammonium peroxydisulfate.

For bleaching, this bleaching mixture is applied to dark blonde to black hair and left there at room temperature for 30 minutes. It is then washed with water and dried. Of course, further hair treatments can be carried out after bleaching. The bleached hair shows no red or yellow tinge, but a very appealing platinum blonde tint.

2. Bleaching mixture based on a bleaching powder. The ingredients listed below are mixed intimately to a bleaching powder containing persulfate:

Parts by weight

Magnesium oxide 40.0

Magnesium carbonate 19.55

io potassium peroxydisulfate 20.0

Ammonium peroxydisulfate 20.0

Brilliant blue R 28032 ex. conc. 0.3

Lilac color R 5283 0.15

15

To produce the bleaching mixture, 1 part by weight of the powder is mixed with 3 parts by weight of an o weight percent hydrogen peroxide solution.

The application is carried out analogously to the information given in Example 1 and also provides a silver-blonde colored hair.

Claims (4)

627 644 1. Alkaline bleaching mixture based on a mixture of hydrogen peroxide and persulfate, characterized in that it also contains the dyes a) 2'-methyl-4 '- (N-ethyl-N-m-sulfobenzyl) -amino-4 "- (N-diethyl) -amino-2-methyl-N-ethyl-N-m-sulfobenzyl- fuchsonimonium, and b) l, 5-di- (4'-methyl-2'-sulfophenylamino) anthraquinone. 2. Bleaching mixture according to claim 1, characterized in that it contains the dyes a) and b) in a weight ratio of 1: 9 to 9: 1. 2nd PATENT CLAIMS 3. Bleaching mixture according to claim 2, characterized in that the weight ratio of the dyes a) to b) is 2: 1. 4. Bleaching mixture according to one of the preceding claims, characterized in that the content of the two dyes a) and b) in total 0.015-0.3 wt .-%, preferably 0.03-0.12 wt .-%, based on the Total weight of the bleaching mixture.