Urea-terminated polyurethane dispersants
First Claim
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1. An aqueous colorant dispersion comprising a comprising a colorant and a urea terminated polyurethane ionic dispersant in an aqueous vehicle, wherein:
- (a) at least some of the ionic dispersant is physically adsorbed to the colorant,(b) the polymeric ionic dispersant stably disperses the pigment in the aqueous vehicle,(c) the volume average particle size of the dispersion is less than about 300 nm,wherein the urea terminated polyurethane dispersant comprises at least one compound of the general Structure (I);
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Abstract
The present invention relates to urea terminated polyurethane dispersants based on certain diols which have grafted alkyl, aryl or fluoroalkyl substituents, aqueous dispersions of such polyurethanes, the manufacture of the urea terminated polyurethane dispersions and inks containing pigments and/or disperse dyes dispersed with these urea terminated polyurethane dispersants.
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Citations
20 Claims
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1. An aqueous colorant dispersion comprising a comprising a colorant and a urea terminated polyurethane ionic dispersant in an aqueous vehicle, wherein:
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(a) at least some of the ionic dispersant is physically adsorbed to the colorant, (b) the polymeric ionic dispersant stably disperses the pigment in the aqueous vehicle, (c) the volume average particle size of the dispersion is less than about 300 nm, wherein the urea terminated polyurethane dispersant comprises at least one compound of the general Structure (I); - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 14, 15, 16, 18, 19, 20)
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- 9. An inkjet ink composition comprising an aqueous vehicle and colorant particles stabilized by an urea terminated polyurethane dispersant in an aqueous vehicle wherein the urea terminated poiyurethane dispersant comprises at least one compound of the general Structure (I):
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12. A process for making a dispersed pigment comprising the steps of a) preparing a urea terminated polyurethane dispersant and then mixing the pigment and the urea terminated polyurethane dispersant in an aqueous carrier medium, then dispersing or deflocculating the pigment where the urea terminated polyurethane (Structure I):
Specification