Light-fast polyisocyanates having good solubility in non-polar solvents

US6420508B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karsten Danielmeier · Solingen, DE
• Lutz Schmalstieg · Neunburg vorm Wald, DE
• Hans-Josef Laas · Odenthal, DE
• Harald Mertes · Neunburg vorm Wald, DE
• Reinhard Jahn · Leverkusen, DE

Key dates

• Filing date: Jun 8, 2000
• Grant date: Jul 16, 2002
• Expiry date: Jun 8, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/7837
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to polyisocyanate mixtures prepared from aliphatic and/or cycloaliphatic diisocyanates and havinga) an average isocyanate functionality of at least 2.0,b) a content of isocyanate groups (calculated as NCO; molecular weight=42) of 4.0 to 28.0 wt. % andc) a content of alkoxy groups having up to 36 carbon atoms of 2.0 to 37.5 wt. %,wherein the alkoxy groups are constituents of allophanate groups or optionally urethane groups, provided that >50 mol % of the alkoxy groups are a constituent of allophanate groups that are connected to at least two polyisocyanate molecules which are each prepared from at least two diisocyanates. The present invention also relates to a process for preparing these polyisocyanate mixtures and to coating compositions, which are highly diluted or dilutable with non-polar solvents and contain these polyisocyanate mixtures and lacquer binders or binder components optionally containing isocyanate-reactive groups.