Claims
- 1. A process for making an ink jet ink comprising:
- a) providing a dispersion containing a pigment, a hydrocarbon carrier, a polyamine/fatty acid condensation polymer dispersant;
- b) mixing the pigment dispersion with rigid milling media having an average particle size less than 100 .mu.m;
- c) introducing the mixture of step (b) into a mill;
- d) milling the mixture from step (c) until the pigment particle size is below about 100 nanometers;
- e) separating the milling media from the mixture milled in step (d); and
- f) diluting the mixture from step (e) to obtain an ink jet ink having a pigment concentration suitable for ink jet printers.
- 2. The process of claim 1 wherein said dispersant is present in a ratio of dispersant:pigment of from about 0.1:1 to about 5:1.
- 3. The process of claim 1 wherein said dispersant is present in a ratio of dispersant:pigment of from about 0.5:1 to about 2:1.
- 4. The process of claim 1 wherein said dispersion contains from about 0.1 to 10% by weight of said pigment.
- 5. The process of claim 1 wherein said polyamine/fatty acid condensation polymer is poly(hydroxy stearate-co-ethyleneimine).
- 6. The process of claim 1 wherein said hydrocarbon carrier is an isoparaffin.
CROSS REFERENCE TO RELATED APPLICATION
Reference is made to commonly-assigned copending U.S. patent application Ser. No. 09/170,660, filed of even date herewith, U.S. Pat. No. 60,053,438 HEC) entitled Process for Making an Ink Jet Ink, by Romano et al., the teachings of which are incorporated herein by reference.
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
WO 9624642 |
Aug 1996 |
EPX |
WO9715633 |
May 1997 |
EPX |