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AssigneeHoechst Aktiengesellschaft
InventorsErnst Spietschka, Adolf Kroh, Otmar Hafner
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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.
A powdered pigment which contains at least 5% of unsubstituted quinacridone and has improved rheological properties for use in a paint system on an alkyd/melamine, acrylic/melamine, acrylate/isocyanate or polyester/isocyanate basis both of a conventional nature and of a modern nature of the "high solids" type, into 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, hexamethylenediisocyanate 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 contain 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 the preparation of a powdered pigment which contains at least 5% of unsubstituted quinacridone and has improved rheological properties for use in a paint system on an alkyd/melamine, acrylic/melamine, acrylate/isocyanate or polyester/isocyanate basis both of a conventional nature and of a modern nature of the "high solids" type, which comprises treating the base pigment--as appropriate before, during or after finishing --with 1 to 20% by weight of the active substance of a paint additive said paint additive being prepared by reacting polyisocyanurates based on tolylene diisocyanate, hexamethylene diisocyanate or mixtures thereof with (1) aliphatic mono- or poly-(hydroxycarbocylic 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 still carry reactive amino or hydroxy-C.sub.1 -C.sub.6 -alkyl groups, until isocyanate groups are no longer detectable.
A powdered pigment which contains at least 5% of unsubstituted quinacridone and has improved rheological properties for use in an alkyd/melamine, acrylic/melamine, acrylate/isocyanate or polyester/isocyanate paint system, said powdered pigment having been treated--before, during or after finishing--with the effective ingredient of a paint additive prepared by reacting free isocyanate-containing polyisocyanurates, based on toluylene diisocyanate, hexamethylene diisocyanate or mixtures thereof, with
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