Powdered azo pigments with improved rheological properties, process for their preparation and their use

US5066687A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Wolfgang Rieper · Frankfurt am Main, DE
• Otmar Hafner · Königstein, DE

Key dates

• Filing date: May 2, 1990
• Grant date: Nov 19, 1991
• Expiry date: May 2, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2998
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Powdered azo pigments with improved rheological properties for use in paint systems on an alkyd/melamine, acrylic/melamine, acrylate/isocyanate or polyester/isocyanate basis, both of a conventional nature and also of a modern nature of the "high solids" type, to which--as appropriate before, during or after finishing--1 to 20% by weight of the active substance of a paint additive of the polyurethane series, prepared by reacting polyisocyanurates which still carry free isocyanate groups and are based on toluylene diisocyanate, hexamethylene diisocyanate or mixtures thereof, with (1) aliphatic mono- or polyhydroxycarbonylic acid C.sub.1 -C.sub.20 -alkyl esters (degree of polycondensation 2-50), (2) polyethylene glycols (molecular weight 500-1,500) and (3) 5- or 6-membered, saturated or unsaturated heterocyclic compounds which contain at least one nitrogen atom in the ring and reactive amino or hydroxy-C.sub.1 -C.sub.6 -alkyl groups, until isocyanate groups are no longer detectable, has/have been applied, a process for their preparation and their use for pigmenting paint systems.