Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
1999-04-23
2001-11-27
Jagannathan, Vasu (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C523S161000, C106S031600
Reexamination Certificate
active
06323257
ABSTRACT:
TECHNICAL FIELD
The present invention relates to ink-jet ink compositions that comprise modified pigment particles (macromolecular chromophores) having both functional groups attached for water solubility and reactive moieties attached to the pigments. These reactive moieties may in turn have various substituents attached to them to provide the desirable attribute, such as enhanced smearfastness, enhanced print quality, improved bleed control, and improved resistance to water when applied to the media. Moreover, these inks formulated with these reactive MMCs demonstrate good viscosity and surface tension and are useful in ink-jet printing, including thermal ink jet printing, piezoelectric ink jet printing, and continuous ink jet printing.
BACKGROUND ART
Ink-jet printers offer a low cost, high quality, and comparatively noise-free option to other types of printers commonly used with computers. Such printers employ a resistor element in a chamber provided with an egress for ink to enter from a plenum. The plenum is connected to a reservoir for storing the ink. A plurality of such resistor elements are arranged in a particular pattern, called a primitive, in a printhead. Each resistor element is associated with a nozzle in a nozzle plate, through which ink is expelled toward a print medium. The entire assembly of printhead and reservoir comprise an ink-jet pen.
On operation, each resistor element is connected via a conductive trace to a microprocessor, where current-carrying signals cause one or more selected elements to heat up. The heating creates a bubble of ink in the chamber, which is expelled through the nozzle toward the print medium. In this way, firing of a plurality of such resistor elements in a particular order in a given primitive forms alphanumeric characters, performs area-fill, and provides other print capabilities on the medium.
Ink-jet inks used in thermal ink-jet printing typically comprise a colorant and a vehicle, with the vehicle often containing water and other relatively low surface tension liquids.
There are two general classifications of colorants: dye-based and pigment-based. Dyes have the advantage of being water-soluble. However, problems with dyes include poor waterfastness, poor smearfastness, poor bleed control between colors, and poor lightfastness. Pigments are generally not soluble in water and require a dispersant or other means to make it soluble in water.
Although the relevant art contains many examples of ink-jet ink formulations using these colorants, a need still exists for ink compositions comprising stable, water soluble pigments which provide improved smearfastness, waterfastness, improved print quality, improved bleed control, and optical density.
REFERENCES:
patent: 4381185 (1983-04-01), Swanson et al.
patent: 4664708 (1987-05-01), Allen
patent: 5176745 (1993-01-01), Moore et al.
patent: 5922118 (1999-07-01), Johnson et al.
patent: 5928419 (1999-07-01), Uemura et al.
patent: 5935309 (1999-08-01), Moffatt et al.
patent: 5952429 (1999-09-01), Ikeda et al.
patent: 5969033 (1999-10-01), Pearlstine
patent: 5969112 (1999-10-01), Feeman et al.
patent: 5972544 (1999-10-01), Carr et al.
patent: 6056811 (2000-05-01), Shimomura et al.
patent: 6059870 (2000-05-01), Taylor et al.
patent: 6132502 (2000-10-01), Yatake
Moffatt John R
Tsang Joseph W
Hewlett--Packard Company
Jagannathan Vasu
JOnes Micheal D.
Shosho Callie E.
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