Polyether-modified polyisocyanate mixtures having improved dispersibility in water

US6426414B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Josef Laas · Odenthal, DE
• Reinhard Halpaap · Odenthal, DE
• Christian Wamprecht · Neuss, DE

Key dates

• Filing date: May 14, 1999
• Grant date: Jul 30, 2002
• Expiry date: May 14, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/792
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to water dispersible polyisocyanate mixtures prepared from aliphatic, cycloaliphatic, araliphatic and/or aromatic diisocyanates and havinga) an average isocyanate functionality of at least 2.0,b) a content of 5.0 to 25.0 wt. %, based on resin solids, of isocyanate groups (calculated as NCO; molecular weight=42) andc) a content of 2 to 50 wt. %, based on resin solids, of ethylene oxide units calculated as C2H2O; molecular weight 44) incorporated within polyether chains containing an average of 5 to 35 ethylene oxide units,wherein at least 60 mole % of the polyether chains are connected via allophanate groups to two polyisocyanate molecules which are each prepared from at least two diisocyanate molecules. The present invention also relates to a process for the preparation of these water dispersible polyisocyanate.