Hair keratin-reducing cysteine esters and compositions for permanent shaping of hair based on same

摘要

The hair shaping composition for permanent shaping of hair contains a cysteine ester of the formula (I):HS-CH2-CH(NH2)-COO-CH2-CH2-R (I)as a keratin-reducing material, wherein R is a hydroxy group, alkoxy groups, a poly(alkoxy) group or a hydroxypoly(alkoxy) group, or one of its acid additional salts. Cysteine ester compounds and their methods of preparation are also described. Preferred embodiments of the hair shaping composition have a pH of from 4.5 to 9.0 and contain from 4 to 30% by weight of the cysteine ester or its acid addition salt and provide a safe and uniform shaping of hair without allergic or sensitizing reactions.