C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/141
C08G 18/75 (2006.01) C08G 18/12 (2006.01) C08G 18/40 (2006.01) C08G 18/42 (2006.01) C14C 11/00 (2006.01) D06N 3/14 (2006.01)
Patent
CA 1185742
COATING AND DRESSING AGENTS FOR LEATHER AND LEATHER SUBSTITUTES BASED ON POLY- URETHANE UREA COATING COMPOUNDS ABSTRACT OF THE DISCLOSURE This invention relates to coating agents and dressing agents for leather and leather substitutes with improved resistance to plasticizer migration, greater hardness and folding strength, a dry hand and resistance to aqueous alcoholic solutions, based on linear or only slightly branched thermoplastic polyurethane ureas built up from the following components: A) at least two macrodiols in a molar ratio of from about 1:6 to 6:1, one of which macrodiols 1) has an average molecular weight of from about 254 to 650 and contains at least one benzene, cyclohexane or cyclohexene ring, while 2) the second macrodiol has an average molecular weight in the range of from about 1200 to 3000 but has at least three times the molecular weight of A/1, and which contain B) from about 0.5 to 11 mol of chain lengthening agent per mol of macrodiol mixture, at least about 50 mol % of the chain lengthening agents used being ali- phatlc and/or cycloaliphatic diamines and/or hydrazine, and in which C) the diisocyanates used are cycloaliphatic diisocya- nates, up to about 50 mol % of which may be re- placed by aliphatic and/or aromatic diisocyanates.
409278
Grammel Jurgen
Pedain Josef
Schroer Walter
Thoma Wilhelm
Aktiengesellschaft Bayer
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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