Polyurethane urea solutions for textile coatings

US10358575B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Sebastian Dörr · Mülheim an der Ruhr, DE
• Sophie Viala · Neunburg vorm Wald, DE
• Thomas Michaelis · Leverkusen, DE

Key dates

• Filing date: Mar 26, 2015
• Grant date: Jul 23, 2019
• Expiry date: Oct 20, 2035

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D06N2211/28
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a method for coating textiles and/or leather, comprising applying at least one polyurethane urea dissolved in a solvent or solvent mixture, wherein the solvent consists of one or more monohydroxy-functional alcohols, or a solvent mixture consisting of organic solvents, containing >80 wt. % of at least one monohydroxy-functional alcohol in relation to the total mass of the solvent mixture is used, and wherein the polyurethane urea is formed by: a) at least one araliphatic, aliphatic and/or cycloaliphatic diisocyanate; b) at least one polyether polyol having a number average molecular weight Mn≥400 and ≤6000 g/mol and an average hydroxyl functionality of ≥1.5 and ≤4; c) at least one amino-functional compound having at least two isocyanate reactive amino groups; and optionally other components. The invention also relates to a textile or leather coating produced using this method and a dissolved polyurethane urea, and to the use of the polyurethane urea for coating substrates and for producing free films.