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Use of oligourethanes as formulating agents for aqueous pigment preparations

  • US 5,770,651 A
  • Filed: 10/13/1993
  • Issued: 06/23/1998
  • Est. Priority Date: 04/16/1991
  • Status: Expired due to Fees
First Claim
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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.

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