Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Method of use – kit – or combined with marking instrument or...
Reexamination Certificate
1998-09-28
2001-03-06
Hess, Bruce H. (Department: 1774)
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Method of use, kit, or combined with marking instrument or...
C347S105000, C428S195100, C428S211100, C428S411100, C503S212000
Reexamination Certificate
active
06197722
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to an imaging member comprising at least one light insensitive layer comprising a catalytic center and multifunctional dye forming coupler. It further relates to a method of imaging comprising imagewise applying to such a member distinct developer solutions that will react with said multifunctional dye forming coupler to produce dyes of different colors.
BACKGROUND OF THE INVENTION
It has become quite popular to form images on plain or treated papers by the imagewise deposition of inks. This deposition can take place by means of contact or impact printing, as in a printing press or typewriter like arrangement or by a variety of more modern non-impact printing systems. One of these non-impact printing systems is known as ink jet printing.
In ink jet printing, tiny droplets of ink are projected directly onto a receptor surface for printing without physical contact between the printing device and the receptor. The placement of each drop on the printing substrate is controlled electronically. Printing is accomplished by moving the printhead across the paper, or by moving the paper across the printhead.
Different types of ink jet printing are known. Two major forms of ink jet printing are “drop-on-demand” printing and “continuous jet” printing. Continuous jet printing is characterized by pressure-projecting inks through a nozzle to generate drops of ink directed in a continuous stream towards the ink receiving element while passing through an imagewise modulated ink deflection system thereby allowing ink droplets of the stream to deposit imagewise on the recording element. Drop-on-demand or impulse ink jet differs from continuous ink jet in that the ink supply is maintained at or near atmospheric pressure. An ink drop is ejected from a nozzle only on demand when controlled excitation coming from pressure generated by a piezoelectric element or from pressure generated by local electrothermal evaporation of liquid (thermal bubble jet) is applied to an ink filled channel ending in a nozzle. Acoustic, microfluidic and electrostatic driven drop-on-demand techniques are also known. These technologies are described in detail by J. L. Johnson,
Principles of Non
-
Impact Printing
, Palatino Press, Irvine, Calif. (1986), and in
Neblette's Imaging Processes and Materials
, Eight Edition, J. Sturges Ed. Van Nostrand, New York, (1989).
When several ink streams are independently employed to imagewise deliver colored inks to a surface, color images can be obtained The inks employed for this purpose typically fall into one of two categories, pigmented inks and soluble inks. The pigmented inks have the advantage of providing stable color images but are lacking in that the pigment particles rest at the surface of the receiving element and are especially prone to mechanically induced smear and rub-off. Additionally, heads delivering the pigmented inks are prone to clogging. The soluble inks solve the rub-off and clogging problems but suffer in that they are prone to both thermal and light fading and to image smearing in humid environs or when the receiving element is hand handled or otherwise wetted.
In related art, Oelbrandt, et al in U.S. Pat. No. 5,621,448 describes the imagewise application of a reducing agent solution to a receiving element having a reducible silver salt to imagewise form a metallic silver image. The possibility of intensifying this black image by the presence of color coupler dyes is mentioned. Sambucetti and Seitz, in IBM Technical Disclosure Bulletin vol. 20, pages 5423-4 (1978) describe the formation of images by imagewise applying a jet or mist of a reactive species to a paper impregnated with a reactant to again form metallic images. Leenders, et al in U.S. Pat. No. 5,621,449 describes imagewise applying a reducing agent to a receiver element comprising a reducible silver salt to form a metallic silver image. The possibility of intensifying this black image by the presence of color coupler dyes is mentioned. The methods described by these workers are directed at providing black images which in some cases may be intensified by the presence of color couplers. These methods all suffer in that the receiving element or the imagewise mist must contain between them sufficient developing agent and metal salts to form a dense image thus requiring that large quantities of solution be employed to deliver the components. The element dries slowly and forms only a black and white image at best. Pimbley, in IBM Technical Disclosure Bulletin vol. 23, pages 1387 (1980) discloses that leuco dyes or vat dyes can be applied to a paper coated or impregnated with an oxidizing agent. This method suffers in that the leuco or vat dyes are unstable and thus leads to a material having poor shelf life. Sufficient details to practice this disclosure are not revealed.
PROBLEM TO BE SOLVED BY THE INVENTION
There is a need for a method of imaging that has the convenience of ink jet but with permanence and smear resistances more like photographic images.
SUMMARY OF THE INVENTION
It is an object of this invention to provide an imaging member that has excellent raw stock and storage stability.
It is a further object of this invention to provide an imaging member that enables the production of viewable images having excellent color saturation and color gamut.
It is another object of the invention to provide an imaging member that enables the production of viewable color images having excellent resistance to dark and light fade as well as resistance to image smear and rub-off.
It is yet another object of this invention to provide an imaging member that enables the production of viewable color images with good resistance to moisture and humidity.
It is yet a further object to provide a method of image formation which results in colorful and stable images that are resistant to dark and light fade, not susceptible to image smear and rub-off and stable to moisture and humidity.
It is an additional object of this invention to provide a method of image formation that produces color images embedded in a media.
It is also an object of this invention to provide a method of image formation that alleviates the problem of head clogging.
These and other objects of the invention are accomplished by providing an imaging member comprising at least one light insensitive layer comprising a catalytic center and substantially free of an incorporated oxidant and multifunctional dye forming coupler.
The objects of the invention are further accomplished by providing a method of imaging comprising providing an imaging member comprising at least one light insensitive layer comprising a catalytic center and substantially free of an incorporated oxidant and multifunctional dye forming coupler, imagewise applying a first developer solution that will react with said multifunctional dye forming coupler, imagewise applying a second developer solution that will react with multifunctional dye forming coupler, and applying an oxidant wherein said first developer solution and said second developer solution produce different colors.
ADVANTAGEOUS EFFECT OF THE INVENTION
The invention provides simple and fast printing of images with photographic type image stability and color.
DETAILED DESCRIPTION OF THE INVENTION
The invention has numerous advantages. The imaging member of the invention shows excellent raw stock stability and images formed using the member show excellent resistance to dark and light fade, are insensitive to moisture, temperature and humidity, and show excellent resistance to image smear and rub-off. Further, the color images show high saturation and excellent color gamut. The method of providing images is simple, fast and easy to operate. Additionally, both the material and the method are compatible with a variety of solution application apparatus thus making the material and method of great value to those already owning digitally addressable solution application printers. By incorporating a stable photographic coupler within a protective medium to form an imaging member and
Irving Lyn M.
Szajewski Richard P.
Eastman Kodak Company
Hess Bruce H.
Leipold Paul A.
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