Solid pigment preparations containing water-soluble surface-active polyurethane-base additives
Solid pigment preparations comprising as essential constituents (A) from 60% to 95% by weight of at least one pigment, (B) from 2.5% to 35% by weight of at least one water-soluble surface-active additive based on polyurethanes and (C) from 2.5% to 35% by weight of at least one nonionic water-soluble surface-active additive (C1) based on polyethers and/or of an anionic water-soluble additive other than additives (B) which is based on polymers of ethylenically unsaturated carboxylic acids (C2), and also production and use of the pigment preparations for coloration of macromolecular organic and inorganic materials and also of plastics.
1. A solid pigment preparation consisting essentially of
(A) from 60% to 95% by weight of at least one pigment,
(B) from 2.5% to 35% by weight of at least one water-soluble surface-active additive based on a polyurethane having an average molecular weight of from 500 to 250,000 and which is based on a reaction product of polyfunctional isocyanate (Ba) with an organic compound (Bb) comprising at least two isocyanate-reactive hydroxyl groups per molecule, wherein the organic compound (Bb) is selected from the group consisting of a polyetherdiol, a polyesterdiol, a lactone-based polyesterdiol, a diol having up to 12 carbon atoms, a triol having up to 12 carbon atoms, a dihydroxy carboxylic acid, a dihydroxy sulfonic acid, a dihydroxy phosphonic acid, a polycarbonatediol, a polyhydroxyolefin and a polysiloxane having on average at least two hydroxyl groups per molecule; and
(C) from 2.5% to 35% by weight of at least one nonionic water-soluble surface-active additive (C1) based on polyether or of an anionic water-soluble surface-active additive other than additives (B) which is based on polymers of ethylenically unsaturated carboxylic acid (C2) which is a homopolymer of an ethylenically unsaturated dicarboxylic acid, or a copolymer of an ethylenically unsaturated dicarboxylic acid, optionally comprising an interpolymerized vinyl monomer with no acid function,
wherein the non-ionic additive (C1) is a reaction product of an alkylene oxide with an amine.
2. The pigment preparation according to claim 1 in the form of granules having an average particle size in the range from 50 to 5000 μm and a BET surface area of ≦15 m 2 /g.
3. A process for producing a pigment preparation according to claim 1 , which comprises wet-comminuting the pigment (A) in an aqueous suspension which comprises some or all of the additive (B) and, optionally the additive (C) and then drying the suspension, after the rest of the additive (B) and (C) have been added.
4. A process for colouring macromolecular organic and/or inorganic materials, which comprises incorporating a pigment preparation according to claim 1 in the macromolecular organic and inorganic material by stirring or shaking.
5. The process according to claim 4 , wherein the organic and/or inorganic materials are contained in composition which is a coating, a paint, an ink or a finish system, the composition comprising a liquid phase comprising water, an organic solvent or mixtures of water and an organic solvent.
6. A process for colouring a plastic, which comprises incorporating pigment preparations according to claim 1 in the plastic by extruding, rolling, kneading or milling.
7. A process for colouring macromolecular organic and/or inorganic materials, which comprises incorporating a pigment preparation according to claim 2 in the macromolecular organic and inorganic material by stirring or shaking.
8. A process for colouring a plastic, which comprises incorporating pigment preparations according to claim 2 in the plastic by extruding, rolling, kneading or milling.
9. The pigment preparation according to claim 1 , having a CE value of less than 100.