PIGMENT PASTES COMPRISING AN AQUEOUS DISPERSION OF A COPOLYMER

摘要

The present invention relates to a pigment paste comprising at least one aqueous dispersion comprising at least one copolymer, said copolymer being preparable by (i) initially charging an aqueous dispersion of at least one polyurethane, and then (ii) polymerizing a mixture of olefinically unsaturated monomers in the presence of the polyurethane from (i), in which (a) a water-soluble initiator is used, (b) the olefinically unsaturated monomers are metered in such that a concentration of 6.0% by weight, based on the total amount of olefinically unsaturated monomers used for polymerization, in the reaction solution is not exceeded over the entire reaction time, and (c) the mixture of the olefinically unsaturated monomers comprises at least one polyolefinically unsaturated monomer, and further comprising a pigment, where the weight ratio of pigment to copolymer is at least 1.5. The invention further relates to the use of the copolymer for dispersion of pigments.

主权项

1. A pigment paste, comprising:
at least one aqueous dispersion, comprising:
at least one pigment, andat least one copolymer,wherein said copolymer is obtained by
(i) initially charging an aqueous dispersion of at least one polyurethane, and then(ii) polymerizing a mixture of olefinically unsaturated monomers in the presence of the polyurethane from (i), wherein
(a) at least one water-soluble initiator is present for said polymerizing,(b) said polymerizing comprises metering the olefinically unsaturated monomers into a reaction solution so that a concentration of 6.0% by weight, based on the total amount of olefinically unsaturated monomers used for polymerization, in the reaction solution is not exceeded over the entire reaction time, and(c) the mixture of the olefinically unsaturated monomers comprises at least one polyolefinically unsaturated monomer,wherein the weight ratio of the at least one pigment to the at least one copolymer is greater than 1.5.