Polyurethane and its use for producing solvent-free coating substances

US6555613B1 · kind B1 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Ulrich Poth · Munster, DE
• Ulrike Rockrath · Senden, DE
• Ingrid Heid · Hachenburg, DE

Key dates

• Filing date: Sep 7, 2001
• Grant date: Apr 29, 2003
• Expiry date: Sep 7, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A reactive polyurethane with a number average molecular weight Mn of 800 to 14,000 daltons, a branching degree of 0.0 to 3.0 Mol/kg and an isocyanate functionality of 2.0 to 6.0. The reactive polyurethane is produced by reacting polyester and/or polyether, which both have at least two functional groups that are reactive with isocyanate and which have a molecular weight of 400 to 2,500 daltons and a branching degree of 0 to 3.5 Mol/kg; with at least one polyol with a molecular weight of 62 to 400 daltons and a functionality of 2 to 4; polyamines and/or alkanolamines; compounds with at least one functional group capable of producing anions and at least one functional group that is reactive with isocyanates; polyisocyanates and/or polyisocyanate adducts; blocking agents for the isocyanate groups and neutralizer. Also, a polyurethane dispersion containing the reactive polyurethanes.