Coating and dressing agents for leather and leather substitutes based on polyurethane urea coating compounds

US4401801A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Josef Pedain · Cologne, DE
• Wilhelm Thoma · Leverkusen, DE
• Jurgen Grammel · Cologne, DE
• Walter Schroer · Leverkusen, DE

Key dates

• Filing date: Aug 16, 1982
• Grant date: Aug 30, 1983
• Expiry date: Aug 16, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C14C11/006
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

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 PA0 (A) at least two macrodiols in a molar ratio of from about 1:6 to 6:1, one of which macrodiols PA1 (1) has an average molecular weight of from about 254 to 650 and contains at least one benzene, cyclohexane or cyclohexene ring, while PA1 (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/l, and which contain PA0 (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 aliphatic and/or cycloaliphatic diamines and/or hydrazine, and in which PA0 (C) the diisocyanates used are cycloaliphatic diisocyanates, up to about 50 mol % of which may be replaced by aliphatic and/or aromatic diisocyanates.