RETANNING AND FATLIQUORING AGENT FOR LEATHER

摘要

The invention relates to a composition for wet retanning and lubricating of pelts, skins, hides, leather intermediate products or non-finished leather, consisting of (A) a reaction product of an ethylenically unsaturated C4-C8-dicarboxylic anhydride with C3-C40-alpha-olefins, followed by partial or total neutralisation with a base, (B) a reaction product of ethylenically unsaturated C^Cs-dicarboxylic anhydrides with C10-C40-fatty acids or C4-C30 polycarboxylic acids or C10-C40 fatty alcohols or oxo-alcohols or glycols or polyglycols or C3-C20 organic amines all being saturated or unsaturated, linear or branched and the fatty acids being ethoxylated and/or propoxylated and/or having been reacted with polyglycols or glycols, and the C4-C30 polycarboxylic acids being ethoxylated and/or propoxylated and/or having been reacted with polyglycols or glycols at least with one carboxylic group, and (C) a reaction product of (B) with bisulphite or metabisulphite or sulphite or sulphuric acid or oleum preferably neutralised with a base where the base is an alkali or earth alkali hydroxide, ammonia or an organic amine.