Use of oligourethanes as formulating agents for aqueous pigment preparations
First Claim
1. An aqueous pigment preparation comprising(a) a formulating agent comprising an oligourethane having a number average molecular weight range of from 5000 to 50,000 and containing(1) no primary or secondary amino groups,(2) 5 to 25% by weight, based on the oligourethane, of incorporated ethoxy groups, and(3) anionic and cationic groups, wherein the quantity of anionic groups is from 0.2 to 0.8 mol per 1000 g of the oligourethane and the molar ratio of anionic to cationic groups is from 0.8 to 4, wherein said oligourethane comprises a reaction product of a polyisocyanate, hydroxyl compounds, wherein at least one such hydroxyl compound is a dihydroxyl compound containing ionic groups;
- and an amino alcohol having tertiary nitrogen atoms;
(b) from 2 to 20 ml, per 100 gram of pigment preparation, of a pigment having a density of from 0.8 to 7 g/ml; and
(c) an aqueous phase containing up to 30% by weight of organic solvent.
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Abstract
Oligourethanes containing both anionic and cationic groups may be used as formulating agents for superior aqueous pigment preparations.
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Citations
6 Claims
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1. An aqueous pigment preparation comprising
(a) a formulating agent comprising an oligourethane having a number average molecular weight range of from 5000 to 50,000 and containing (1) no primary or secondary amino groups, (2) 5 to 25% by weight, based on the oligourethane, of incorporated ethoxy groups, and (3) anionic and cationic groups, wherein the quantity of anionic groups is from 0.2 to 0.8 mol per 1000 g of the oligourethane and the molar ratio of anionic to cationic groups is from 0.8 to 4, wherein said oligourethane comprises a reaction product of a polyisocyanate, hydroxyl compounds, wherein at least one such hydroxyl compound is a dihydroxyl compound containing ionic groups; - and an amino alcohol having tertiary nitrogen atoms;
(b) from 2 to 20 ml, per 100 gram of pigment preparation, of a pigment having a density of from 0.8 to 7 g/ml; and (c) an aqueous phase containing up to 30% by weight of organic solvent. - View Dependent Claims (2, 3, 4, 5, 6)
- and an amino alcohol having tertiary nitrogen atoms;
Specification