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Ink compositions and multicolor thermal ink jet printing process for the production of high quality images
| Details |
Inventors: Lin, John Wei-Ping;
Assignee: Xerox Corporation (Stamford, CT)
Primary Examiner: Klemanski; Helene
Assistant Examiner:
Attorney, Agent or Firm: Byorick; Judith L.
Disclosed is a set of inks for printing multicolor images in an ink jet printer, said ink set comprising (A) a first ink having a first color and comprising water and a colorant selected from the group consisting of (1) anionic dyes, (2) dyes having physically or chemically associated therewith a stabilizing agent having anionic groups thereon, (3) pigment particles having anionic groups chemically attached thereto, (4) pigment particles having physically or chemically associated therewith a stabilizing agent having anionic groups thereon, and (5) mixtures thereof; and (B) a second ink comprising water, an optional colorant having a color other than the first color, and an ammonium salt having at least two cationic ammonium functional groups, wherein the colorant in the first ink is capable of being immobilized on a printing substrate by interaction with the ammonium salt having at least two cationic ammonium functional groups in the second ink, thereby enabling reduced intercolor bleed. |
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DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a first ink is provided which comprises water, an optional humectant, optional additives, and a colorant selected from the group consisting of (1) anionic dyes, (2) dyes stabilized by an anionic stabilizing agent (such as a surfactant or emulsifying agent), (3) pigment particles having anionic groups chemically attached thereto, (4) pigment particles having physically or chemically associated therewith a stabilizing agent (also referred to as a dispersing agent, or a dispersant) having anionic groups (--CO.
sub.
2.
sup.
-, --SO.
sub.
3.
sup.
-, or the like) thereon, and (5) mixtures thereof.
The color of the first ink is generally preferred to be black, although the color of the first ink can also be any other selected color if so desired.
Further according to the present invention, a second ink comprises water, an optional humectant, optional additives, an optional colorant, and an ammonium salt having at least two cationic ammonium functional groups.
Examples of suitable ammonium salts include diquaternary ammonium salts (ammonium salts containing two cationic ammonium moieties), triquaternary ammonium salts (ammonium salts containing three cationic ammonium moieties), and polyquaternary ammonium salts (ammonium salts containing more than three cationic ammonium moieties), as well as any combination thereof with each other and/or with a quaternary ammonium salt containing only one cationic ammonium moiety.
When a diquaternary ammonium salt or triquaternary ammonium salt is selected, each diquaternary ammonium salt comprises two cationic ammonium moieties and their two corresponding anions, and each triquaternary ammonium salt comprises three cationic ammonium moieties and their three corresponding anions, with the total number of carbon atoms being up to about 60.
The diquaternary and triquaternary ammonium salts can also comprise any desired number of heteroatoms, such as oxygen, sulfur, nitrogen, selenium, phosphorous, or the like
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Image Analysis 
