Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
1998-03-12
2001-01-23
Martin, Roland (Department: 1753)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C430S126200
Reexamination Certificate
active
06177222
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is directed to papers, and more specifically, to papers for electrography, such as xerographic compatible photographic papers, that is for example coated papers containing a supporting substrate derived from, for example, natural cellulose and having the appearance of a photographic base paper with certain coatings thereover and thereunder, and the use of these papers in imaging, especially xerographic processes and digital imaging processes, and wherein uniform high gloss images can be obtained. More specifically, the present invention is directed to processes for achieving gloss uniformity of xerographic prints and which gloss is similar or equivalent to silver halide glossy prints or high quality glossy offset prints in color intensity and gloss uniformity with coated papers to which has been applied a substantially clear coating of a polyester resin, such as a low melt branched polyester, like the known SPAR polyesters, reference U.S. Pat. No. 3,590,000, the disclosure of which is totally incorporated herein by reference. The thin, for example from about 1 to about 10 microns, and preferably about 7 microns, or other suitable thickness, coating, especially the polyester coating, absorbs the fused toner particles thereby resulting in a smooth surface and high uniform gloss, and which gloss is less dependent on the degree of toner coverage. In embodiments, the coated photographic papers are capable of recording clear, brilliant, glossy images of high optical density, and with lightfastness values of greater than about 98 percent, and more specifically, from about 98 to about 100 percent for dry colored, such as pigmented toners, waterfastness values of about 100 percent and comparable in look and feel to conventional color photographic camera prints.
PRIOR ART
Certain polyester coated papers are known, reference for example U.S. Pat. Nos. 5,627,128; 5,534,479 and 4,692,636.
There is disclosed in U.S. Pat. No. 4,663,216 a synthetic paper comprised of (1) a multilayer support, (2) a layer of a transparent film of a thermophotographic resin free from an inorganic fine powder formed on one surface of the support (1), and (3) a primer layer of a specific material, reference the Abstract of the Disclosure for example. The support (1) comprises (1a) a base layer of a biaxially stretched film of a thermophotographic resin, a surface and a back layer (1b), and (1c) composed of a monoaxially stretched film of a thermophotographic resin containing 8 to 65 percent by weight of an inorganic fine powder.
Further, there is disclosed in U.S. Pat. No. 4,705,719 a synthetic paper of multilayer resin film comprising a base layer (1a) of a biaxially stretched thermophotographic resin film, and a laminate provided on at least one of opposite surfaces of the base layer, the laminate including a paper-line layer (1b) and a surface layer (1c), the paper like layer containing a uniaxially stretched film of thermophotographic resin containing 8 to 65 percent by weight of inorganic fine powder, and wherein the surface layer contains an uniaxially stretched film of a thermophotographic resin.
In U.S. Pat. No. 4,868,581, there is disclosed an opaque paper-based receiving material for ink jet printing which comprises a poly(olefin)-coated paper overcoated with an ink-receiving layer which contains a mixture of gelatin and starch. Reportedly, these receiving materials exhibit gloss, good color density and are smudge resistant. Although such receiving materials, when pictorially imaged with an ink jet printing device, may enable images acceptable in appearance and feel, the images thereon are still not believed to be of the same high quality that is customarily expected from and exhibited by photographic prints.
Also, there is disclosed in U.S. Pat. No. 4,903,039 an opaque paper-based receiving material for ink jet printing, which papers comprise a poly(olefin)-coated paper overcoated with an ink-receiving layer which contains an aqueous dispersion of a polyester ionomer, namely a poly[cyclohexylenedimethylene-co-oxydiethylene isophthalate-co-malonate-co-sodiosulfo benzenedicarboxylate], dispersed in vinyl pyrrolidone polymer.
Further, there is disclosed in U.S. Pat. No. 4,903,040 an opaque paper-based receiving material for ink jet printing which comprises a poly(olefin)-coated paper overcoated with an ink-receiving layer which contains an aqueous dispersion of a polyester ionomer, namely a poly[cyclohexylenedimethylene isophthalate-cosodiosulfobenzene dicarboxylate], dispersed in vinyl pyrrolidone polymer.
Moreover, there is disclosed in U.S. Pat. No. 4,903,041 an opaque paper-based receiving material for ink jet printing which comprises a poly(olefin)-coated paper overcoated with an ink-receiving layer which contains an aqueous dispersion of a polyester ionomer, namely a poly[cyclohexylenedimethylene-co-xylyleneterephthalate-co-malonate-co-sodioiminobis(sulfonylbenzoate], dispersed in vinyl pyrrolidone polymer.
U.S. Pat. No. 5,451,458, the disclosure of which is totally incorporated herein by reference, discloses a recording sheet which comprises (a) a substrate; (b) a coating on the substrate which comprises (1) a binder selected from the group consisting of (A) polyesters; (B) polyvinyl acetals; (C) vinyl alcohol-vinyl acetal copolymers; (D) polycarbonates; and (E) mixtures thereof; and (2) an additive having a melting point of less than about 65° C. and a boiling point of more than about 150° C. and including, for example, furan derivatives; and developing the latent image with a toner which comprises a colorant and a resin selected from the group consisting of (A) polyesters; (B) polyvinyl acetals; (C) vinyl alcohol-vinyl acetal copolymers; (D) polycarbonates; and (E) mixtures thereof; and (3) transferring the developed image to a recording sheet which comprises (a) a substrate; (b) a coating on the substrate which comprises (1) a binder selected from the group consisting of (A) polyesters; (B) polyvinyl acetals; (C) vinyl alcohol-vinyl acetal copolymers; (D) polycarbonates; and (E) mixtures thereof.
While the above materials and processes may be suitable for their intended purposes, a need remains for photographic papers particularly suitable for use in electrophotographic applications. In addition, a need remains for photographic papers which can be employed with xerographic dry toners so that the heat and energy required for properly fusing the toner to the photographic paper is reduced by about 14 percent allowing the toner to be fused, for example, at 150° C. instead of the conventional about 175° C. Further, a need remains for photographic papers which can be employed with xerographic toners, and wherein jamming of the photographic papers in the fusing apparatus is reduced. Additionally, there is a need for photographic papers suitable for use in electrophotographic applications with reduced energy demands, by about 14 percent, allowing the toner to be fused at 150° C. instead of the usual in some instances of about 175 to about 180° C., and reduced jamming, and wherein the photographs also exhibit acceptable image quality, excellent image fix to the paper, and more importantly, high uniform gloss similar to silver halide prints which typically have perfectly uniform high gloss levels of about 70 GU to about 100 GU as measured by a 75° Glossmeter.
SUMMARY OF THE INVENTION
It is a feature of the present invention to provide photographic papers with many of the advantages indicated herein.
It is another feature of the present invention to provide photographic papers, inclusive of xerographic photopapers particularly suitable for use in electrophotographic imaging systems; and also wherein there are enabled developed images with uniform gloss, and wherein, for example, the coating on the paper, such as the polyester illustrated herein, absorbs the fused toner particles thereby resulting in a smooth image surface.
It is yet another feature of the present invention to provide photographic papers which can be employed w
Gardner Sandra J.
Malhotra Shadi L.
McAneney T. Brian
Naik Kirit N.
Sharp James H.
Martin Roland
Oliff & Berridg,e PLC
Xerox Corporation
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