Use of polyaspartic acid amides as leather auxiliary products

US5885474A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Jurgen Reiners · Leverkusen, DE
• Manfred Schnee · Leverkusen, DE
• Torsten Groth · Reinbek, DE
• Winfried Joentgen · Neunburg vorm Wald, DE
• Gerd Schmitz · Leverkusen, DE
• Harro Traubel · Leverkusen, DE
• Nikolaus Muller · Monheim, DE

Key dates

• Filing date: Jan 28, 1998
• Grant date: Mar 23, 1999
• Expiry date: Jan 28, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/4935
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Leather can be pretreated to obtain good body, soft feel, and excellent grain smoothness and solidity with products having a molecular weight of 700 to 30,000 and which are obtainable by reaction of PA1 A. polysuccinimide having a molecular weight, determined as the number-average, of 500 to 10,000, with PA1 B. 5 to 90 mol % based on the succinimide units of polysuccinimide A, and/or secondary amine, the nitrogen substituents of which contain 1 to 60 carbon atoms and which can be unsubstituted or substituted, at least 2.5 mol % of the nitrogen substituents of the amine containing at least 12 carbon atoms, PA1 C. optionally, (i) derivatives of C.sub.1 -C.sub.18 -monocarboxylic acids, C.sub.2 -C.sub.10 -dicarboxylic acids, and/or (ii) monoisocyanates, diisocyanates epichlorohydrin (for reaction of amino and/or hydroxyl groups on the nitrogen substituents of the reaction product of A and B), and PA1 D. 95 to 10 mol % of ring-opening base in the presence of water.