Lacquer polyisocyanates with aliphatically and aromatically bound isocyanate groups

US5606004A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Martin Brahm · Siegen, DE
• Josef Pedain · Cologne, DE
• Lutz Schmalstieg · Neunburg vorm Wald, DE

Key dates

• Filing date: Jul 31, 1995
• Grant date: Feb 25, 1997
• Expiry date: Jul 31, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/795
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing liquid lacquer polyisocyanates with aliphatically and aromatically bound isocyanate groups and an NCO content of 5 to 25 wt. % by trimerizing an isocyanate component A), containing A1) 70 to 100 wt. % of diisocyanatotoluene and A2) 0 to 30 wt. % of other aromatic isocyanates and B) aliphatic lacquer polyisocyanates, optionally with prior, simultaneous and/or subsequent reaction of a portion of the isocyanate groups with an alcohol component C) having a molecular weight of 32 to 900, and optionally in the presence of D) inert solvents; the resulting lacquer polyisocyanates; and their use in coating compositions, in particular as a cross-linking agent for polyhydroxyl compounds in two-component polyurethane coating compositions.