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US 6,641,257 B1Granted
Lightfast ink jet inks
AssigneeAmerican Ink Jet Corporation
InventorsFengying Shi, Paul Doll, Walter Wnek, Michael Andreottola
Life of this patent
Estimating the term…
Abstract
An ink with improved lightfastness suitable for thermal ink jet printing contains at least an aqueous vehicle, a dye and a light stabilizer to protect the dye in the ink during exposure to light. Different additives as light stabilizer for individual inks were described herein. A UV Glossy substrate was found to reinforce the lightfastness of print.
Claims54
An ink suitable for ink jet printing, comprising
- an aqueous vehicle,
- a dye having an excitation energy, and
- a stabilizer capable of absorbing energy of wavelengths similar to the excitation energy of the dye.
The ink set suitable for ink jet printing, comprising
- a cyan ink including a substantially lightfast cyan dye,
- a magenta ink including a substantially lightfast magenta dye, and
- a yellow ink including a substantially lightfast yellow dye wherein at least one ink further includes an ultraviolet absorber, selected such that the ultraviolet absorber is capable of absorbing energy at a wavelength similar to the excitation energy of the dye in the at least one ink.
A residue disposed on a surface, the residue comprising
- a dye having an excitation energy, and
- a stabilizer capable of absorbing energy of wavelengths similar to the excitation energy of the dye.
An ink set suitable for ink jet printing, comprising
- a cyan ink including substantially lightfast cyan dye and a stabilizer capable of absorbing energy of wavelengths similar to the excitation energy of the cyan dye,
- a magenta ink including a substantially lightfast magenta dye and a stabilizer capable of absorbing energy of wavelengths similar to the excitation energy of the magenta dye, and
- a yellow ink including a substantially lightfast yellow dye and a stabilizer capable of absorbing energy of wavelengths similar to the excitation energy of the yellow dye.
Dependencies are inferred from the claim text.