Aqueous dispersion of polyurethane resins, a method of manufacturing them, coating agents containing them and use thereof

US5658617A · kind A · utility

Assignee

• Herberts Gesellschaft mit beschrankter Haftung · DE

Inventors

• Armin Gobel · Syke, DE
• Hans-Peter Patzschke · Wuppertal, DE

Key dates

• Filing date: Feb 5, 1996
• Grant date: Aug 19, 1997
• Expiry date: Feb 5, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/8054
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A method of manufacturing aqueous dipsersion of polyurethane resins free from urea groups and containing ionic groups and suitable for coating agents, with a number average moleculear weight (Mn) of 10,000 to 300,000 and an acid number of 5 to 50, by preparing a polyurethane prepolymer containing OH groups and with an OH number of 5 to 75 and a number average molecular weight (Mn) of 5,000 to 50,000.