Claims
- 1. A dispersant compound, comprising an acrylic backbone having a pigment-interactive substituent and a stabilizing substituent, wherein the pigment-interactive substituent has at least one primary amine group, and the stabilizing substituent comprises an alkoxy-terminated polyalkylene oxide structure --D(CHR.sub.1 CH.sub.2 O--).sub.n R.sub.2,
- wherein D is a divalent radical that is --O-- or --NR.sub.3, wherein R.sub.3 is hydrogen or alkyl of one to twelve carbon atoms;
- R.sub.1 is hydrogen or a mixture of hydrogen and alkyl of one to eight carbon atoms;
- R.sub.2 is an alkyl of one to thirty carbon atoms; and
- n is an integer from one to one thousand.
- 2. A method of dispersing a pigment, comprising the steps of:
- (a) adding the pigment to a mixture of the dispersant of claim 1, water, and a cosolvent, and mixing to form a premix, and
- (b) grinding the premix to produce a dispersion in which the maximum particle size is less than six microns.
- 3. The dispersant of claim 1, wherein the molecular weight of the acrylic backbone is from 2000 to 50,000.
- 4. The dispersant of claim 1, wherein the pigment interactive substituent and the stabilizing substituent are linked to the acrylic backbone through urethane or urea linkages.
- 5. The dispersant of claim 1, wherein the pigment interactive substituent and the stabilizing substituent are linked to the acrylic backbone through .beta.-hydroxy ester linkages or .beta.-hydroxy amine linkages.
- 6. The dispersant of claim 1, wherein the pigment interactive substituent has one primary amine group.
- 7. The dispersant of claim 1, wherein the pigment interactive substituent comprises --OCH.sub.2 CH.sub.2 NH.sub.2.
- 8. The dispersant of claim 1, wherein the pigment interactive substituent has two primary amine groups.
- 9. The dispersant of claim 1, wherein the pigment interactive substituent comprises --N(CH.sub.2 CH.sub.2 NH.sub.2).sub.2.
- 10. The dispersant of claim 1, wherein the D is either --O-- or --NH--.
- 11. The dispersant of claim 1, wherein the R.sub.1 is hydrogen and the R.sub.2 is methyl.
- 12. The dispersant of claim 1, wherein the n is from 20 to 200.
- 13. The dispersant of claim 1, wherein the n is from 30 to 70.
- 14. The method of claim 2, wherein the pigment is an inorganic pigment.
- 15. The method of claim 2, wherein the pigment is an organic pigment.
Parent Case Info
This is a divisional of copending application Ser. No. 08/360,502 filed on Dec. 21, 1994, U.S. Pat. No. 5,527,614.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4169080 |
Spencer |
Sep 1979 |
|
5231134 |
Carpenter et al. |
Jul 1993 |
|
5320673 |
Carpenter |
Jun 1994 |
|
Divisions (1)
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Number |
Date |
Country |
Parent |
360502 |
Dec 1994 |
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