| 摘要 |
Powder pigments which contain at least 5% unsubstituted quinacridone, having improved rheological properties for use in lacquer systems based on alkyde/melamine, acrylic/melamine, acrylate/isocyanate or polyester/isocyanate both of conventional nature and of modern nature of the "high solids" type, onto which is applied - where appropriate before, during or after the finish - from 1 to 20% by weight of the active substance in a lacquer additive from the polyurethane series, produced by reacting polyisocyanurates which are still carrying free isocyanate groups, on the basis of tolylene diisocyanate, hexamethylene diisocyanate or mixtures thereof with 1 aliphatic mono- or poly-(hydroxycarboxylic acid)-alkyl-C1-C20-esters (degree of polymerization from 2 to 50), 2 polyethylene glycols (molecular weight 500- 1500 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 hydroxyalkyl-C1-6 groups, until no isocyanate groups can be detected, process for preparing them and their use for pigmenting polymeric materials and for colouring lacquer systems.
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