Abstract:
A hair dyeing composition achieving intensive, stable colorations, which can be varied by the addition of further coupling substances, contains an oxidation dyestuff system reacting with peroxide comprising a combination of 
     a) 2-(2,5-diaminophenyl)ethanol of the water-soluble salts thereof, and 
     b) 2,6-dichloro-4-aminophenol.

Description:
BACKGROUND OF THE INVENTION 
     The present invention concerns a composition for the coloration of human hair on the basis of an oxidation-dyestuff system reacting with peroxide, providing intensive, permanent colors used either as such, or which can, in combination with further developing and/or coupling substances, be used to achieve additional variations. 
     The developing substances still used most frequently in hair dyeing compositions are 1,4-diaminobenzene (p-phenylenediamine) and 1-methyl-2,5diaminobenzene (p-toluylenediamine). Use of these substances still may entail problems to the extent that in special cases they can lead to skin sensitization in extremely sensitive persons (so-called “para-allergies”). 
     It has already been attempted to solve this problem by the use of alternative developing substances. To a limited extent, this is possible by the use of tetraaminopyrimidine; however it is then necessary to accept diminished color intensity and reduced possibilities to vary the different shades. 
     A further solution of the problem, namely the virtual absence of a skin sensitizing effect on one hand and an enhanced level of variations in the preparation of possible shades on the other hand, is achieved by the use of 2-(2′-hydroxyethyl amino)-5-aminotoluene or the water-soluble salts thereof, described in EP-A 615 743, and incorporation of triaminohydroxy pyrimidines, in particular 2,5,6-triamino-4-hydroxy pyrimidine, 2,4,5-triamino-6-hydroxy pyrimidine, 4,5,6-triamino-2-hydroxy pyrimidine or the salts thereof, in particular the sulfates, disclosed in EB 467 026 as developing substances in hair dyeing compositions. Even these changes leave room for improvement with regard to coloration. DE-A 196 14 303 therefore discloses oxidation dyestuff substances containing 2-(2′-hydroxyethyl amino)-5-toluene or the salts thereof as developing substances in combination with 2,6-dichloro-4-aminophenol. 
     Although this combination permits achievement of a multitude of different shades, the degree of variation as well as color intensity can still be optimized. 
     SUMMARY OF THE INVENTION 
     It has now been found that an intensive hair coloration which is stable against the influence of light, repeated shampooing and permanent waving without irritating or sensitizing the skin can be obtained, if an oxidation dyestuff system reacting with peroxide is used which comprises a combination of 2-(2,5-diaminophenyl)ethanol or the water-soluble salts thereof, and 2,6-dichloro4-aminophenol. 
     Application of these compositions on the basis of a customary carrier achieves very expressive, intensive, long-lasting hair colorations after oxidation with peroxide, which can be varied to achieve additional shades by the addition of additional coupling and developing substances. 
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Such preferred substances are selected in particular from the group encompassing 1-methoxy-2-amino-4-(β-hydroxyethyl amino)benzene, 2-amino-3-hydroxypyridine, 2,6-diaminopyridine, 3-amino-2-methyl amino-6-methoxypyridine, 2-(dimethyl amino)-5-aminopyridine, 1-(β-hydroxyethyl)-2,5-diaminobenzene, 2-(2′-hydroxyethyl amino)-5-aminotoluene, 2,5,6-triamino-4-hydroxypyrimidine, 5-amino-2-methyl phenol, 4-amino-3-methyl phenol, 2,5-diaminopyridine, 2-amino-5-N,N-diethyl aminotoluene, 1,4-diaminobenzene, 2,5-diaminotoluene, 1,3-diaminobenzene, 1-methyl-2-hydroxy-4-aminobenzene, resorcinol, 2-methyl resorcinol, 4-chlororesorcinol, 1-naphthol, 2-aminophenol, 3-aminophenol, 5-amino-2-methoxy phenol, and/or 2-amnino-4-(β-hydroxyethyl amino)anisole or the water-soluble salts thereof. 
     The use of 2-(2,5-diaminophenyl)-ethanol as developing substance in hair dyeing compositions has already been disclosed in EP-A 7537 and EP-B 400 330, however, the effects achieved with the combinations according to the invention cannot be obtained with the systems described therein. 
     Use of further developing substances known per se is also possible. In addition to those named above, reference is made in particular to 4-aminophenol, 5-amino salicylic acid and/or 1,2,4-triaminobenzene. 
     The total concentration of developing substances customarily ranges between about 0.05% and 5%, preferably 0.1% and 4%, in particular 0.25% to 0.5% and 2.5% to 3% by weight, calculated to total hair dyeing composition(excluding the oxidation agent), whereby these figures always refer to the proportion of free base. 
     The weight proportion of 2-(2,5-diaminophenyl)ethanol to 2,6-dichloro-4-aminophenol ranges between about 1:8 to 8:1, preferably about 1:5 to 5:1, in particular 1:2 to 2:1. 
     In the hair dyeing compositions according to the invention, the coupling substances as reaction partners of the developing substance(s) have about the same molecular proportion as the developing substances, i.e., in amounts from 0.05% to 5.0%, preferably 0.1% to 4%, in particular 0.5% to 3% by weight, calculated to the total composition(excluding the oxidation agent), whereby these figures always refer to the proportion of free base. 
     If desired, the compositions according to the invention may also contain so-called shading agents for precise adjustment of the desired shade, in particular direct-acting dyestuffs. 
     Such shading agents are, for example, nitro dyestuffs such as 2-amino-4,6-dinitrophenol, 2-amino-4-nitrophenol, 2-amino-6-chloro-4-nitrophenol, etc., preferably in amounts from about 0.05% to 2.5%, in particular 0.1% to 1% by weight of the dyestuff composition (excluding the oxidizing agent). 
     The hair dyeing compositions according to the invention can also comprise the basic substances and additives customarily found in such compositions, i.e. conditioners, etc., known as state of the art and described, for example, in the monography of K. Schrader, “Grundlagen and Rezepturen der Kosmetika”, 2nd Ed. (Hüthig Buch Verlag, Heidelberg, 1989), pp. 782 to 815. 
     They can be prepared as solutions, creams, gels or also in form of aerosol products; suitable carrier compositions are well known. 
     For application, the oxidation dyestuff precursor is mixed with an oxidizing agent. Preferred oxidizing agent is hydrogen peroxide, for example in concentrations from 2% to 6%. However, it is also possible to use other peroxides, such as urea peroxide and melamine peroxide. 
     The pH-value of the ready-to-use hair-dyeing composition, i.e. after admixture with peroxide, can be in the slightly acidic range, i.e. from 5.5 to 6.9, as well as in the neutral and in the alkaline range, i.e. between pH 7.1 and 9.5. 
     Following are various Examples of embodiments illustrating the invention. 
     
       
         
               
             
               
               
               
               
             
           
               
                   
               
               
                 Carrier Composition 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Stearyl alcohol 
                 8.0 
                 (% by wt.) 
               
               
                   
                 Coco fatty acid monoethanolamide 
                 4.5 
               
               
                   
                 1.2-Propanedial mono/disterate 
                 1.3 
               
               
                   
                 Coco fatty alcohol polyglycol ether 
                 4.0 
               
               
                   
                 Sodium laury sulfate 
                 1.0 
               
               
                   
                 Oleic acid 
                 2.0 
               
               
                   
                 1.2-Propanediol 
                 1.5 
               
               
                   
                 Na-EDTA 
                 0.5 
               
               
                   
                 Sodium sulfite 
                 1.0 
               
               
                   
                 Protein hydrolyzate 
                 0.5 
               
               
                   
                 Ascorbic acid 
                 0.2 
               
               
                   
                 Perfume 
                 0.4 
               
               
                   
                 Ammonia, 25% 
                 1.0 
               
               
                   
                 Ammonium chloride 
                 0.5 
               
               
                   
                 Panthenol 
                 0.8 
               
               
                   
                 Water 
                 ad 100.0 
               
               
                   
                   
               
             
          
         
       
     
     The oxidation dyestuff combinations according to the invention were incorporated into this carrier base, whereby the water content was reduced accordingly. 
     The colorations were effected on wool patches and strands of bleached human hair by application of a 1:1 mixture of the dyestuff precursor and 6% hydrogen peroxide solution and twenty minutes processing at room temperature with subsequent washing and drying. 
     The following colorations were obtained: 
    
    
     EXAMPLE 1 
     
       
         
               
               
               
             
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 0.28 (% by wt.) 
                 2-(2.5-Diaminophenyl)ethanol sulfate (A 80) 
               
               
                   
                 0.20 
                 2.6-Dichloro-4-aminophenol 
               
               
                   
                 0.25 
                 3-Aminophenol 
               
             
          
           
               
                   
                 Coloration: Intensive dark violet. 
               
               
                   
                   
               
             
          
         
       
     
     EXAMPLE 2 
     
       
         
               
               
               
             
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 0.28 (% by wt.) 
                 SA 80 
               
               
                   
                 0.20 
                 2,6-Dichloro-4-aminophenol 
               
               
                   
                 0.32 
                 α-Naphthol 
               
             
          
           
               
                   
                 Coloration: Intensive, expressive azure blue. 
               
               
                   
                   
               
             
          
         
       
     
     EXAMPLE 3 
     
       
         
               
               
               
             
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 0.28 (% by wt.) 
                 A 80 
               
               
                   
                 0.20 
                 2,6-Dichloro-4-aminophenol 
               
               
                   
                 0.28 
                 1-Methyl-2-hydroxy-4-aminobenzene 
               
             
          
           
               
                   
                 Coloration: Intensive, glossy violet. 
               
               
                   
                   
               
             
          
         
       
     
     EXAMPLE 4 
     
       
         
               
               
               
             
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 0.28 (% by wt.) 
                 A 80 
               
               
                   
                 0.20 
                 2,6-Dichloro-4-aminophenol 
               
               
                   
                 0.28 
                 2-Methyl resorcinol 
               
             
          
           
               
                   
                 Coloration: Intensive, glossy olive-brown. 
               
               
                   
                   
               
             
          
         
       
     
     EXAMPLE 5 
     
       
         
               
               
               
             
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 0.28 (% by wt.) 
                 A 80 
               
               
                   
                 0.20 
                 2.6-Dichloro-4-aminophenol 
               
               
                   
                 0.25 
                 2-Amino-3-hydroxypridine 
               
             
          
           
               
                   
                 Coloration: Glossy red-brown. 
               
               
                   
                   
               
             
          
         
       
     
     EXAMPLE 6 
     
       
         
               
               
               
             
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 0.28 (% by wt.) 
                 A 80 
               
               
                   
                 0.20 
                 2.6-Dichloro-4-aminophenol 
               
               
                   
                 0.25 
                 Resorcinol 
               
             
          
           
               
                   
                 Coloration: Glossy gold-brown. 
               
               
                   
                   
               
             
          
         
       
     
     EXAMPLE 7 
     
       
         
               
               
               
             
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 0.28 (% by wt.) 
                 A 80 
               
               
                   
                 0.20 
                 2.6-Dichloro-4-aminophenol 
               
               
                   
                 0.63 
                 1-Methyoxy-2-amino-4-(β-hydroxyethyl 
               
               
                   
                   
                 amino)benzene sulfate 
               
             
          
           
               
                   
                 Coloration: Glossy deep blue.