Method for the production of leather and semifinished products, and formulations that are suitable therefor
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United States of America Patent
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Issued Date -
May 10, 2007
app pub date -
Sep 17, 2004
filing date -
Sep 26, 2003
priority date (Note) -
Abandoned
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Abstract
Semifinished products or leather are or is produced by a process in which pelts, pickled pelts or semifinished products are treated with a) at least one sheet silicate and b) at least one copolymer which is obtainable by copolymerization of at least one ethylenically unsaturated dicarboxylic anhydride (A), derived from at least one dicarboxylic acid of 4 to 8 carbon atoms, at least one vinylaromatic compound (B1) or at least one oligomer (B2) of branched or straight-chain C.sub.2-C.sub.10-alkene, at least one oligomer having an average molecular weight M.sub.n of from 300 to 5 000 g/mol or being obtainable by oligomerization of at least 3 equivalents of C.sub.2-C.sub.10-alkene, and optionally at least one ethylenically unsaturated monomer (C) differing from (A) and having at least one hetero atom, and reaction with at least one compound (D) of the formula I a or I b and optionally hydrolysis with water or aqueous alkaline solution, where, in formula I a and I b, A.sup.1 are identical or different and are C.sub.2-C.sub.6-alkylene R.sup.1 is linear or branched C.sub.1-C.sub.20-alkyl and n is an integer from 1 to 200.
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