Abstract: Polycationic polymers have been prepared and have been found to be useful in cosmetic compositions for the treatment of the hair and skin, or in the treatment of natural and synthetic textile fibers. These polymer comprise units of the formula ##STR1## .

Abstract: Novel polymers useful, in particular, in cosmetic compositions for application to the hair are described.

Abstract: A dye polymer for use in dye compositions for coloring keratinic fibers comprises units of the formula ##STR1## wherein, R represents hydrogen or alkyl, x is a whole number equal at least to 2, and X represents the residue of a molecule of a dye or a dye precursor.

Abstract: A cosmetic composition for imparting to human skin after exposure to sunlight a coloration resembling a natural tan comprising a cosmetic vehicle suitable for topical application to the skin and an effective amount of at least one compound of the formula ##STR1## wherein R.sub.1 represents hydrogen or amino; R.sub.2 represents hydrogen, lower alkyl or amino; R.sub.3 represents hydrogen, lower alkyl or amino; R.sub.4 represents hydrogen, lower alkyl or chlorine; and R.sub.5 represents hydrogen, lower alkyl or hydroxy, or amino when R.sub.1 is amino, with the proviso that R.sub.1, R.sub.2 and R.sub.3 are not simultaneously amino; and at least one of R.sub.1, R.sub.2 R.sub.3 means amino or an acid addition salt thereof.

Abstract: A cosmetic composition for imparting to human skin after exposure to sunlight a coloration resembling a natural tan comprises a cosmetic vehicle suitable for topical application to the skin and an effective amount of at least one compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 each independently represent hydrogen, an aliphatic radical having 1-18 carbon atoms, carbalkoxy having 2-5 carbon atoms, acyl having 2-5 carbon atoms, aryl, aryl substituted by alkyl having 1-4 carbon atoms or hydroxy, a heterocycle containing 4-6 members, substituted or not by alkyl having 1-4 carbon atoms, halogen or hydroxy, or R.sub.1 and R.sub.2 together form a saturated ring containing 4-12 chains, optionally substituted by alkyl having 1-4 carbon atoms, halogen or hydroxy, or bridged and containing a heteroatom selected from N, O or S; and R.sub.3 represents hydrogen, a lower aliphatic group containing 1-6 carbon atoms, lower alkoxy containing 1-4 carbon atoms or halogen, with the proviso that R.sub.1, R.sub.