Polyurethane binding agents having a low content of highly volatile monomers

US6784242B2 · kind B2 · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Achim Huebener · Seevetal, DE
• Guenter Henke · Neuss, DE
• Andreas Bauer · Kaarst, DE

Key dates

• Filing date: May 6, 2002
• Grant date: Aug 31, 2004
• Expiry date: May 28, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31551
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A polyurethane binder with a low content of readily volatile isocyanate-functional monomer is provided by a process of(a) reacting a first at least difunctional isocyanate and a first polyol component at an NCO:OH ratio less than 2 wherein the first at least difunctional isocyanate has an NCO group with a slower rate of reaction with the OH groups than a second NCO group to produce a reaction product containing free OH groups and reacting the reaction product with a second polyol and a second at least difunctional isocyanate wherein the second at least difunctional isocyanate has isocyanate groups with a more rapid rate of reaction with the OH groups than the predominent percentage of isocyanate groups present in the reaction product.