Water-dispersible polyisocyanate mixtures, a process for their preparation and their use in two-component aqueous compositions

US5252696A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Josef Laas · Odenthal, DE
• Tillmann Hassel · Cologne, DE
• Werner Kubitza · Leverkusen, DE
• Reinhard Halpaap · Odenthal, DE
• Klaus Noll · Cologne, DE

Key dates

• Filing date: Nov 4, 1992
• Grant date: Oct 12, 1993
• Expiry date: Nov 4, 2012

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 which PA0 a) have an average isocyanate functionality of 1.8 to 4.2, PA0 b) contain 12.0 to 21.5% by weight of (cyclo)aliphatically bound isocyanate groups (calculated as NCO, molecular weight=42) and PA0 c) contain 2 to 20% by weight of ethylene oxide units (calculated as C.sub.2 H.sub.4 O, molecular weight=44) arranged within polyether chains, the polyether chains containing an average of 5.0 to 9.9 ethylene oxide units. The present invention also relates to the preparation of these polyisocyanate mixtures by reacting at an NCO/OH equivalent ratio of 4:1 to 120:1 PA0 A) a polyisocyanate component having an average isocyanate functionality of 2.1 to 4.4 and containing one or more polyisocyanates in which all the isocyanate groups are (cyclo)aliphatically bound with PA0 B) a monovalent polyalkylene oxide polyether alcohol containing an average of 5.0 to 9.9 ethylene oxide units. Finally, the present invention also relates to aqueous two-component compositions containing these polyisocyanate mixtures and aqueous resins having isocyanate-reactive groups.