POLYSACCHARIDES AND/OR POLYPEPTIDES BASED GRAFT POLYMERS AS SYNTHETIC TANNINS Russian patent published in 2016 - IPC C08F251/00 C08F289/00 C08H1/00 C14C3/22 

FIELD: chemistry.

SUBSTANCE: invention relates to graft polymers based on polysaccharides and polypeptides. Graft polymer based on polysaccharides and polypeptides or respective derivatives thereof are obtained by free-radical polymerisation of A) a monomer selected from following, or a mixture of following monomers: (a) from 20 to 100 wt% acrylic acid or methacrylic acid, or mixture thereof, or salts thereof with an alkali metal, alkali-earth metal or ammonium, (b) from 0 to 80 wt% other monoethylenically unsaturated monomers, which can be copolymerised with monomer (a) and (c) from 0 to 5 wt% monomers containing per molecule at least 2 ethylenically unsaturated unconjugated double bonds in presence of B1) polysaccharides subjected to oxidative, hydrolytic or enzymatic decomposition, oxidised polysaccharides subjected to hydrolytic decomposition or subjected to enzymatic decomposition, or chemically modified decomposed products, chemically modified mono-, oligo-or polysaccharides, or mixtures of said compounds and B2) polypeptides subjected to hydrolytic or enzymatic decomposition and optionally chemically modified polypeptides, or mixtures of said compounds, with weight ratio A:(B1+B2) ranging from 60:40 to 1:99 and B1:B2 from 97:3 to 3:97. Also disclosed is a method of producing graft polymers, method of tanning leather, and tanned leather.

EFFECT: wider range of polymers for various types of tanning.

7 cl, 18 ex