Polyurethane prepolymers with reduced functionality having terminal alkoxysilane and OH groups, a method of preparing them and their use

US6762270B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Michael Ludewig
• Mathias Matner · Neuss, DE
• Stefan Groth · Leverkusen, DE
• Gerhard Ruttmann · Burscheid, DE

Key dates

• Filing date: Feb 3, 2003
• Grant date: Jul 13, 2004
• Expiry date: Feb 3, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to polyurethane prepolymer having terminal alkoxysilane and OH groups which is the reaction product ofA) a polyurethane prepolymer prepared by incomplete reaction ofi) an aromatic, aliphatic or cycloaliphatic diisocyanate component having an NCO content of 20 to 60% by weight withii) a polyol component comprising a polyoxyalkylene diol having a number average molecular weight of 3000 to 20,000,wherein the reaction is stopped after 50 to 90% of the OH groups of component ii) are reacted and 10 to 50% are unreacted, withB) a compound having alkoxysilane and amino groups, preferably a compound containing alkoxysilane and aspartate groups.The present invention also relates to a process for preparing these polyurethane prepolymers containing terminal alkoxysilane and OH groups and to isocyanate-free, sealants, adhesives, primers and coatings containing these polyurethane prepolymers containing terminal alkoxysilane and OH groups as binders.