Process for removing substu00e1ncias queratinosas of dead animal skins, leather, composite, and process for preparing the same.

摘要

"The process to remove substu00e1ncias queratinosas of dead animal skins, leather, compound, and process for preparing the same.The invention relates to a method for the extraction of keratin from the skins of dead animal, characterised by treating the skins of dead animal with a substance of general formula (I),Or at least a salt of alkaline metal, alkaline metal salt - earthy, ammonium salt, phosphonium salt or of corresponding variables having the following definitions: ru00ac 1u00ac,Ru00ac 4u00ac = together or independently, h, C ~ 6 ~ C ~ 14 ~ - arila, C ~ 1 ~ C ~ 12 ~ - alkyl, substituted or substituted with one or more groups sh or Oh, ru00ac 2u00ac, ru00ac 3u00ac = together or independently, h,C ~ 6 ~ C ~ 14 ~ - arila, C ~ 1 ~ C ~ 12 ~ - alkyl, substituted or substituted with one or more groups sh or Oh, and at least one of ru00ac 2u00ac or ru00ac 3u00ac is not h.Or ru00ac 1u00ac and ru00ac 4u00ac are not h and two groups of ru00ac vicinal 1u00ac the ru00ac 4u00ac may be C ~ 3 ~ C ~ 10 ~ - alkylene, ru00ac 5u00ac = h, C ~ 1 - C ~ 12 ~ - alkyl, H - (C = O or C ~ 1 ~ C ~ 4 ~ - alkyl - (C = O, xu00ac 1u00ac, xu00ac 2u00ac, xu00ac 3u00ac and xu00ac 4u00ac = Oh.SH or nhru00ac 5u00ac which ru00ac 1u00ac the ru00ac 4u00ac they contain at least one sulphur atom, at least one of the xu00ac 1u00ac xu00ac 4u00ac = HS and ru00ac 1u00ac the ru00ac 4u00ac contains no sulphur atom.At least two xu00ac 1u00ac the xu00ac 4u00ac = sh.