Powdered pigments with improved rheological properties, processes for their preparation and their use with a content of at least 5% of unsubstituted quinacridone

US4732618A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Ernst Spietschka · Idstein, DE
• Adolf Kroh · Bad Camberg, DE
• Otmar Hafner · Königstein, DE

Key dates

• Filing date: Aug 11, 1986
• Grant date: Mar 22, 1988
• Expiry date: Aug 11, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0063
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Powdered pigments which contain at least 5% of unsubstituted quinacridone and have 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, onto which--as appropriate before, during or after finishing--1 to 20% by weight of the active substance of a paint additive, prepared by reacting polyisocyanurates which still carry free isocyanate groups and are based on tolylene diisocyanate, hexamethylene diisocyanate or mixtures thereof, with (1) aliphatic mono- or poly-(hydroxycarboxylic acid) C.sub.1 -C.sub.20 -alkyl esters (degree of polymerization 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 1 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, processes for their preparation and their use for pigmenting polymeric materials and for coloring paint systems.