Back to results
US 5,507,864 AGranted
Phase change ink composition employing a combination of dyes
AssigneeTektronix, Inc.
InventorsC. Wayne Jaeger, Loc V. Bui, Donald R. Titterington
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeTektronix, Inc.
InventorsC. Wayne Jaeger, Loc V. Bui, Donald R. Titterington
Estimating the term…
The present invention preferably employs a phase change ink composition that includes a combination of different dye types such as an anthraquinone dye and a xanthene dye, which is most preferably a rhodamine dye. While each dye type is insufficiently soluble with respect to favored carrier compositions to preserve color saturation in reduced ink quantity prints, the dye type combination permits increased dye loading and maintains print quality. In a preferred embodiment of the invention, a favored carrier composition is adjusted to promote the colored form of a preferred rhodamine dye (C.I. Solvent Red 49) and mixed with a preferred anthraquinone dye (C.I. Solvent Red 172) whose concentration is kept below a critical level to prevent post printed blooming. The resulting preferred phase change ink compositions provide a magenta phase change ink with enhanced light fastness and color saturation, as well as good compatibility with preferred existing subtractive primary color phase change inks.
A nonaqueous phase change ink composition comprising:
A method for increasing the dye load of a phase change ink to enhance the color intensity of printed ultra thin films of the phase change ink, comprising:
A method for quenching the fluorescence of nonaqueous phase change ink composition including a normally fluorescent dye, comprising:
Dependencies are inferred from the claim text.