Oxidative hair dye

Some chemicals used as bases (or primary intermediates) in hair-dye oxidative products (adapted... 

Uses Emuisifier, dispersant for pigments, paints, cosmetics, industriai emuisions emuisive base for hair dyes, oxidative coioring... 

Permanent Hair Colorants. Permanent colorants produce hair coloration that lasts until the hair grows out. Color is formed inside the hair by hydrogen peroxide-induced coupling reactions of colorless dye precursors. A hiU range of shades can be obtained with this system and the permanent or oxidative hair colorants are considered to be the most important class of hair dyes. 

Also present but not essential in permanent hair colorants are nitro dyes which dye hair without oxidation. These dyes, nitro derivatives of aminophenols and benzenediamines, impart yellow, orange, or red tones. Although they have good tinctorial value, they are not as colorfast as the oxidative dyes. They also are used in semipermanent hair colorants. 

Table 17. Intermediates Used in Oxidation Hair Dyes ...

Leuco naphthazarins have been well studied as hair dyes.25 Human hair has been colored purplish red from dye solutions in aqueous benzyl alcohol. For example, 33 has been oxidized on hair during the drying process. 

Lead continues to be used in pigments. For example, lead chromate and lead oxide are used in paints, and lead acetate is used in hair dyes. 

The cosmetic world has not been indifferent to the application of laccase for example, laccase-based hair dyes are less irritating and easier to handle than current hair dyes, because laccases replace H2O2 as an oxidizing agent in the dye formulation (Rodriguez-Couto and Toca-Herrera 2006). 

Preparations containing I //-7-aru i no-3,6-dime thy lpyrazolo[ 1,5 -z] [ 1,2,3 triazolcs <1999EUP923929> are oxidative hair dyes. 

In patented hair dyes the mentioned 5-5 bicyclic ring systems such as 94 and 95 (Figure 9) are used as oxidative couplers <1999EUP923929, 1997W09735551, 2003FRP2830192, 2004EUP1428510>. 

Diaminophenoxyethanol HC1, intermediate used in oxidation hair dyes, 7 858t... 

Hydroprocessing, in petroleum refining, 18 654-657 Hydropulping, 10 535 Hydropyrolysis, coal liquefaction, 6 854 Hydroquinolines, 21 198-199 Hydroquinone (HQ) from benzene, 3 620 as a black-and-white chemical reducing agent, 19 205-206 in bleaching preparations, 7 847 clathrates, 14 160 dye releaser, 19 291-292 inclusion compounds in, 14 172, 174 intermediate used in oxidation hair dyes, 7 858t... 

RECOVERY OF TESTED COMPOUNDS IN OXIDATIVE HAIR DYES... 

J. Zhou, H. Xu, G.-H. Wan, C.-F. Duan and H. Cui, Enhancing and inhibiting effects of aromatic compounds on luminol-dimethylsulfoxide-OH chemiluminescence and determination of intermediates in oxidative hair dyes by HPLC with chemiluminescence detection. Talanta, 64 (2004) 467—477. 

C.-E. Lin, Y.-T. Chen and T.-Z. Wang, Separation of benzenediamines, benzenediols and aminophenols in oxidative hair dyes by micellar electrokinetic chromatography using cationic surfactants. J. Chromatogr.A, 837 (1999) 241-252. 

Uses. Oxidative dye developing agent for photographic processes precursor for pharmaceuticals used in hair dyes... 

Early animal studies of p-aminophenol administered in the diet and topical studies of oxidative hair dyes containing p-aminophenol have not shown definitive carcinogenic... 

Frequent inflammation of the pharynx and larynx has heen reported in exposed workers. Very small quantities of the dust have caused asthmatic attacks in workers after periods of exposure ranging from 3 months to 10 years. Sensitization dermatitis has heen reported from its use in the fur dyeing industry. In this process, oxidation products of p-phenylenedi-amine are generated that are also strong skin sensitizers. Many instances of inflammation and damage of periocular and ocular tissue have been reported from contact with hair dyes containing p-phenylenediamine, presumably in sensitized individuals. ... 

DiNardo JC, Picciano JC, Schnetzinger RW, et al Teratological assessment of five oxidative hair dyes in the rat. Toxicol Appl Pharmacol 78 163-166, 1985... 

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