Aqueous polyurethane dispersion for waterproof breathable coatings

US9783701B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Sebastian Dörr · Mülheim an der Ruhr, DE
• Hans Georg Grablowitz · Cologne, DE
• Sophie Viala · Neunburg vorm Wald, DE
• Thomas Feller · Solingen, DE
• Thomas Michaelis · Leverkusen, DE

Key dates

• Filing date: Sep 11, 2012
• Grant date: Oct 10, 2017
• Expiry date: Sep 11, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An aqueous polyurethane dispersion comprises a polyurethane polymer obtainable by the reaction of an isocyanate-functional polyurethane prepolymer A) with an isocyanate-reactive component B), wherein the isocyanate-functional prepolymer A) is obtainable by the reaction of a mixture comprising: a polyol component comprising a polyester polyol obtainable by the reaction of a mixture comprising an aliphatic dicarboxylic acid and at least one diol selected from the group consisting of linear aliphatic diols and a branched aliphatic diols; and a polyisocyanate component comprising ≧50 weight-%, based on the total weight of polyisocyanates, of dicyclohexylmethane diisocyanate. The isocyanate-reactive component B) comprises a compound comprising sulfonate groups which is employed in an amount of ≧3.5 weight-% to ≦10 weight-%, based on the total weight of the polyol component, the polyisocyanate component and the isocyanate-reactive component B). The invention also concerns the use of such an aqueous polyurethane dispersion for coatings, a method of manufacturing a coated substrate and to a coated substrate.