Hair Treatment

Cosmetic compositions for hair treatment containing dendrimers or dendrimer conjugates

Hair Treatment Abstract
The hair treatment compositions are in a variety of forms including permanent shaping compositions, oxidative after-treatment compositions, hair fixing compositions, hair bleaching compositions, hair cleansing compositions, hair care compositions or hair dye compositions containing direct-dyeing dye compounds and/or a combination of at least one developer and coupler and are characterized by 0.1 to 35 percent by weight of at least one dendrimer, preferably a poly(iminopropane-1,3-diyl)-dendrimer with nitrile and/or amino end groups. Methods of hair treatment based on these hair treatment compositions are described.

Hair Treatment Claims
We claim:

1. A method of treating hair comprising the steps of:

a) applying from 5 to 30 grams of a hair treatment composition to hand-towel-dried hair, according to the hair abundance,

b) allowing the hair treatment composition to remain on the hair for from 3 to 15 minutes, and

c) after step b), rinsing the hair treatment composition out of the hair and drying the hair;

wherein the hair treatment composition contains 0.01 to 75 percent by weight of at least one dendrimer and at least one cosmetic ingredient for hair treatment, in a cosmetic foundation or base; wherein said at least one cosmetic ingredient for hair treatment is at least one keratin-reducing mercapto compound for permanent hair shaping, at least one oxidizing agent for an oxidative after-treatment in said permanent hair shaping, at least one hair fixing polymer, at least one hair bleaching agent, at least one direct-dyeing hair dye compound, or a combination of at least one coupler substance and at least one developer substance for oxidative hair dyeing.

2. A method of treating hair comprising the steps of:

a) applying from 5 to 30 grams of a hair treatment composition to hand-towel-dried hair, according to the hair abundance, and

b) allowing the hair treatment composition to remain on the hair;

wherein the hair treatment composition contains 0.01 to 75 percent by weight of at least one dendrimer and at least one cosmetic ingredient selected from the group consisting of hair care-giving materials and hair fixing compounds.

3. A method of cleansing hair comprising the steps of:

a) applying from 5 to 30 grams of a hair cleansing composition to hand-towel-dried hair, according to the hair abundance,

b) allowing the hair cleansing composition to remain on the hair for from 3 to 15 minutes, and

c) after step b), rinsing the hair treatment composition out of the hair and drying the hair; and

wherein the hair cleansing composition contains 50 to 90 percent by weight water, 0.01 to 25 percent by weight of at least one anionic, cationic, amphoteric or non-ionic surfactant, and 0.1 to 35 percent by weight of at least one dendrimer, in a cosmetic base or foundation, and

wherein said at least one dendrimer is a poly(iminopropane-1,3-diyl)-dendrimer with nitrile and/or amino end groups.

4. A method of treating hair comprising the steps of:

a) applying from 5 to 30 grams of a hair treatment composition to hand-towel-dried hair, according to the hair abundance,

b) allowing the hair treatment composition to act on the hair for from 3 to 15 minutes, and

c) rinsing the hair treatment composition from the hair;

wherein the hair treatment composition contains 0.01 to 75 percent by weight of at least one dendrimer and at least one cosmetic ingredient selected from the group consisting of hair care-giving materials and hair fixing compounds.

Hair Treatment Description
BACKGROUND OF THE INVENTION

The present invention relates to a cosmetic composition for hair treatment with a content of at least one dendrimer or dendrimer conjugate.

A pleasing outer appearance has always been viewed as very important. Hair styling plays a special roll in providing that pleasing outer appearance. Well cared for hair is the basis for a pleasing hair style. An entire series of hair treatment compositions, such as shampoos, hair care preparations, rinses, sprayed liquid, which are applied in the widest variety of types of applications, e.g. as leave on- or rinse off-products, exists for the care and cleaning of the hair. Besides these hair care products three additional product categories are used for modifying the hair, namely permanent or temporary hair dye compositions, permanent hair shaping compositions in the form of mildly alkaline or acidic permanent wave and hair curling compositions and compositions that allow only a temporary shaping and stabilizing of the hair-do and are generally known as styling compositions. These products include hair sprays, hair lacquers, fixing lotions, fixing foams, hair gels, luster-providing products, hair creams, etc. All these agents or compositions usually contain a plurality of individual ingredients or components that fulfill a wide variety of purposes in the concerned recipe.

Thus substances were sought which are compatible in the largest possible number of recipes and which can perform a variety of functions according to the formulation. Substances which can perform two or more functions in a recipe are of special interest. The requirements for hair care include, for example, that wet hair should already have a good, pleasant feel and a good combability. A pleasant feel elasticity and volume (with the exception of "Wetlook" hair-dos) are similarly expected of dry hair.

SUMMARY OF THE INVENTION

It is an object of the present invention to find a new class of substances which fulfill the above-named requirements.

According to the invention one such new class of substances are the starburst dendrimers described in the following disclosure. Dendrimers are useful in all types of hair treatment compositions.

Indeed the low molecular weight dendrimers cause a definite reduction in wet combing force and provide a good feel in acid media. The dry hair treated in this way has good volume and elasticity.

The subject matter of the invention is thus a cosmetic composition for hair treatment with a content of at least one dendrimer or dendrimer conjugate in a suitable cosmetic foundation or base.

Dendrimers are three-dimensional, highly branched oligomers and polymers with a well defined chemical structure. Generally dendrimers comprise a core made from a plurality of branches, the so-called generations, and end groups.

Dendrimers are described in a number of patent applications. Thus building blocks made from dendrimers are described in U.S. Pat. No. 5,210,309. U.S. Pat. No. 4,102,827 and U.S. Pat. No. 4,036,808 describe making highly cationic polyelectrolytes in the form of branched polyelectrolytes or star-shaped polyelectrolytes and the use of such cationic electrolytes in conductive hydrogels. WO 93/21144 describes the production of cascade polymers. A series of applications describe the making of dendrimers and applications for pharmaceutical purposes. In EP 0 271 180 star-shaped conjugates for pharmaceutical and agricultural purposes are described. In SE 468 771 the making of polyester dendrimers and their uses as coupling components in polyester, epoxy- or polyurethane resins and their use as binder components for a series of non-cosmetic applications is claimed. WO 92/14543 describes unimolecular micelles based on cascade polymers and methods of making them. In U.S. Pat. No. 4,587,329 and U.S. Pat. No. 4,558,120 a method of making star-shaped dendrimers and their application as demulsifiers in O/W emulsions is described. The use of star-shaped dendrimers for calibration and characterization of substances with an overall dimension up to 10 .mu.m is claimed in EP 0 247 629. A series of scientific publications disclosing methods for making dendrimers exists in addition to the above-described patents. Dendrimers can be made in very

different ways. They can be made according to the methods described in WO 93/21144 or EP 0 271 180. Additional manufacturing processes are described in U.S. Pat. No. 4,587,329, U.S. Pat. No. 4,558,120 and WO 92/14543. Furthermore a series of additional disclosures exist in which the making of dendrimers is described.

The preferred dendrimers in the cosmetic compositions according to the invention are made from a 1,4-diaminobutane core by a stepwise Michael Addition of acrylnitrile with subsequent catalytic hydrogenation of the cyano groups to amino groups, in which dendrimers with nitrile or amino end groups are obtained. These dendrimers are designated as poly(iminopropan-1,3-diyl)dendrimer with nitrile and/or amino end groups. Suitable dendrimers are, e.g., marketed under the tradename 4-cascade: 1,4-diaminobutane [4]: propylamine and/or x-cascade: 1,4-diaminobutane [4]: (1-azabutylidene).sup.x-4 : propylamine by DSM/Netherlands, wherein x=4, 8, 16, 32 or 64.

The cosmetic composition according to the invention preferably contains from 0.01 to 75 percent by weight, especially preferably from 0.1 to 35 percent by weight, of the at least one dendrimer or dendrimer conjugate. The composition according to the invention can be in the form of a hair wash composition, a hair care composition, a hair fixing composition, a hair dye composition or a hair tinting composition. The composition can be applied as a lotion, foam, milk, gel, cream, gel foam or spray. It can be formulated as a leave-on or as a rinse-off product.

The cosmetic composition according to the invention can furthermore contain standard conventional cosmetic additives for hair treatment compositions, for example, solvents, such as water and lower aliphatic alcohols, e.g. ethanol, propanol and isopropanol, or glycols, such as glycerol and 1,2-propylene glycol; wetting agents or emulsifiers from the classes of anionic, cationic, amphoteric or non-ionic surface active substances or surfactants, such as fatty alcohol sulfates, alkylbenzene sulfonates, alkyltrimethyl-ammonium salts, alkylbetaines, ethoxylated fatty alcohols, ethoxylated nonylphenols, fatty acid alkanol amides, ethoxylated fatty acid esters, in an amount of from 0.1 to 30 percent by weight; perfume oils in an amount of from 0.1 to 5.0 percent by weight; turbidity-inducing agents, such as, e.g., ethylene glycol distearates, in an amount of from about 0.2 to 5.0 percent by weight; pearlescence agents, such as a mixture of fatty acid monoalkylol amides and ethylene glycol distearate, in an amount of from about 1.0 to 10 percent by weight; bactericidal and fungicidal materials, such as 2,4,4-trichloro-2-hydroxydiphenyl ether or methyl chloroisothiazoline, in an amount of from 0.01 to 1.0 percent by weight; thickeners, such as coconut oil fatty acid diethanol amide in an amount of about 0.2 to 3.0 percent by weight; buffer substances, e.g. sodium citrate or sodium phosphate, in an amount of 0.1 to 1.0 percent by weight; solubilizing agents, such as ethoxylated castor oil, in an amount of from about 0.1 to 1.0 percent by weight; dye compounds, such as fluorescein sodium salt, in an amount of from about 0.1 to 1.0 percent by weight; care-giving materials, such plant and herbal extracts, protein and silk hydrolyzates, cationic resins, lanolin derivatives, in an amount of from 0.1 to 5 percent by weight; physiologically compatible silicone derivatives, such as silicone oil, silicon polymers and siloxane; light protective agents, moisture containing agents, antioxidants, radical-trapping agents, anti-flaking agents, in an amount of from about 0.1 to 2 percent by weight; physiologically compatible organic or inorganic acids, such as formic acid, glyoxylic acid, lactic acid, tartaric acid, citric acid or phosphoric acid; natural, modified natural or synthetic polymers, such as shellac, cationic polymers, anionic polymers, non-ionic polymers, amphoteric polymers, chitosan, chitin or chitosan derivatives; direct-dyeing hair dye compounds, which are developed by oxidation, oxidizing agents, reducing agents, fatty alcohols, sheen-giving agents, vitamins, softeners, combability improving agents, defattying agents, defoaming agents and propellant gases, such as fluorinated hydrocarbons, dimethylether, hydrocarbons and compressed gases.

In a preferred embodiment of the invention the composition according to the invention also contains from 0.01 to 40 percent by weight, especially preferably from 0.01 to 25 percent by weight of at least one anionic, cationic, amphoteric or non-ionic surfactant and from 50 to 90 percent by weight water. A composition of this type can be used as a hair cleansing agent.

In a further preferred embodiment the composition according to the invention contains additionally at least one natural or synthetic polymer, which is selected from the group of fixing and thickening polymers. The polymers can be used in amounts of from 0.01 to 25 percent by weight, preferably from 0.1 to 20 percent by weight and can be present in dissolved form or as a dispersion. A composition of this type including the fixing polymers can be used as a hair fixing composition.

When the composition according to the invention is a permanent shaping composition, it contains from 0.5 to 15 percent by weight of at least one keratin-reducing mercapto compound and is present advantageously as an aqueous, alkaline or weakly acidic (pH=5 to 10) preparation, which contains as keratin-reducing mercapto compound, e.g. cysteine, cysteamine, N-acetyl-L-cysteine, mercaptocarboxylic acids, such as thioglycolic acid or thiolactic acid, or salts of mercaptocarboxylic acids, such as ammonium and guanidine salts of thioglycolic acid or thiolactic acid.

The required alkalinity is adjusted by addition of ammonia, organic amines, ammonium and alkali carbonates or alkali hydrogen carbonates. However the composition according to the invention can also be a neutral or acidic hair shaping composition (pH=4.5 to 7) which has an effective content of sulfites or mercaptocarboxylic acid esters.

In the first case advantageously sodium or ammonium sulfite or the salt of sulfuric acid with an organic amine, for example monoethanol amine and guanidine, is used in a concentration of about 2 to 12 percent by weight (calculated as SO.sub.2). In the later case thioglycolic acid monoglycolic ester or -glycerol ester is used in a concentration of about 5 to 50 percent by weight (corresponding to a content of free thioglycolic acid of from 2 to 16 percent by weight).

The composition according to the invention for permanent hair shaping also can contain a mixture of the aforementioned keratin-reducing compounds.

After a sufficient acting time for permanent shaping of hair, which amounts to from about 10 to 30 minutes, according to the condition of the hair, the pH and the shaping effectiveness of the hair shaping agent as well as the application temperature, the hair is rinsed with water and subsequently oxidatively after-treated ("fixed"). The after-treatment composition, is used in an amount of from about 50 to 100 g according to the amount of the hair.

A fixing composition according to the invention with a content of dendrimers or dendrimer conjugates and any known oxidizing agent used up to now in this sort of treatment can be used for the oxidative after-treatment. For example, oxidizing agents used in this type of fixing composition include sodium and potassium bromate, sodium perborate, urea peroxide and hydrogen peroxide.

The concentration of oxidizing agent differs according to the application time (usually about 5 to 15 minutes) and the application temperature. Usually the oxidizing agent is present in the aqueous fixing composition in a concentration of from about 0.5 to 10 percent by weight.

Both the composition according to the invention for permanent shaping of hair and also the composition for fixing hair can be present in the form of an aqueous solution or emulsion and in thickened form on an aqueous basis, especially as a cream, gel or paste.

Subsequently the curlers are removed. In cases where it is required, the curled hair can be given an oxidative hair treatment. Then the hair is rinsed with water, put in a hair-do and finally dried.

The above-described process for permanent shaping of hair provides a safe and uniform shaping from the hair roots to the hair tips, an outstanding wet and dry combability, a pleasant feel and an attractive look in the dry state as well as a loose, springy and uniform permanent wave, especially in the vicinity of the hair roots.

A hair dye composition according to the invention contains also from 0.05 to 2.0 percent by weight of at least one direct-dyeing hair dye, which, for example, can be selected from the following classes of direct-dyeing hair dye compounds: aromatic nitro dye compounds, e.g., 1,4-diamino-2-nitrobenzene; azo dye compounds, for example Acid Brown 4 (C.I. 14 805); anthraquinone dye compounds, e.g. Disperse Violet 4 (C.I. 61 105); triphenylmethane dye compounds, e.g. Basic Violet 1 (C.I. 42 535), wherein these dye compounds can have an acidic, nonionic or basic character according to the type of their substituents; and/or natural hair dye compounds, such as Henna or Reng, which do not require oxidation to develop their colors.

The composition according to the invention can be sprayed using a propellant or dispensed with the help of a mechanical spraying apparatus or with the help of a foam producing apparatus as a foam.

When the cosmetic composition according to the invention is sprayed with the help of a propellant composition, it advantageously contains from 3 to 75 percent by weight of a propellant and is filled in a pressurized container.

Lower alkanes, such as n-butane, i-butane and propane or their mixtures, or also dimethyl ether and fluorinated hydrocarbons, such as F 152 (1,1-difluoroethane) or F 134 (tetrafluoroethane) and furthermore gases at the pressures which are to be used, for example, N.sub.2, N.sub.2 O and CO.sub.2 and mixtures thereof, can be used as the propellant.

Mechanical spraying or foam producing apparatuses are those apparatuses which allow spraying or foaming of a liquid without using a propellant. For example, a spray pump or an elastic container provided with a spray valve can be used as a suitable mechanical spray apparatus. The composition according to the invention is filled in this container under pressure, so that the elastic container is expanded. The composition is continuously dispensed from the container, when the spray valve is opened, because of the contraction of the elastic container. As a suitable mechanical foam producing apparatus, e.g., the top with a foam producing device described in EP-B 0 0460 154 can be used on a flexible container.

When the cosmetic composition according to the invention is used for hair care, the following method is used.

After washing the hair from 5 to 30 g of the composition according to the invention are distributed on the hand towel dried hair, according to the amount of hair, and allowed to act on the hair for about 3 to 15 minutes. Subsequently the composition is rinsed out of the hair, the hair is combed, a hair-do is formed as needed and the hair is dried. In a preferred embodiment of the invention the composition is allowed to remain on the hair, which means that it is not rinsed out of the hair and thus saves the user some work.

The hair treatment composition according to the invention may include a bleaching agent so that it is in the form of the hair bleaching composition.

When the composition according to the invention is an oxidation hair dye composition, it contains from about 0.01 to 5.0 percent by weight of a suitable coupler substance and from about 0.01 to 5.0 percent by weight of a suitable developer substance. For example, suitable coupler substances include resorcinol, 4-chlororesorcinol, 1-naphthol, 3-aminophenol or derivatives of m-phenylene-diamines. Suitable developer substances include, e.g., 2,5-diaminotoluene, 2,5-diaminophenylethyl alcohol, p-aminophenol or 1,4-diaminobenzene. For development of the hair color a suitable oxidizing agent such as hydrogen peroxide or its addition compounds with urea, melamine, sodium borate or sodium carbonate are used in the form of a 3- to 12- percent by weight aqueous solution, however also air oxygen can be used.

The following examples should illustrate the subject matter of the present invention, but without limiting the appended claims provided hereinbelow.