Stock material or miscellaneous articles – Composite
Reexamination Certificate
1998-07-17
2001-01-09
Hess, Bruce H. (Department: 1774)
Stock material or miscellaneous articles
Composite
C428S195100, C428S211100, C428S327000, C428S532000
Reexamination Certificate
active
06171702
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is directed to coated substrates such as coated papers and coated transparencies useful in for example, electrography such as xerography. Specifically the present invention is directed to coated papers containing a supporting substrate derived from natural cellulose and having the appearance of a photographic paper, and which paper contains certain coatings thereover and thereunder and the use of these papers in xerographic imaging with liquid inks or dry toners. More specifically, the present invention is directed to xerographic papers capable of absorbing fuser oil, recording clear, brilliant, glossy images of high optical density, and with lightfast values of greater than 98 percent, and more specifically from about 98 to about 100 percent for all toner colorants, waterfast values of about 100 percent, and comparable in look and feel to conventional color photographic prints with xerographic printing, reference copending application U.S. Ser. No. 09/041,353, the disclosure of which is totally incorporated herein by reference.
PRIOR ART
There is disclosed in U.S. Pat. No. 3,911,180 a method for the preparation of resin coated paper with a relatively smooth surface, and which paper is comprised of a thermoplastic resin layer on the paper and wherein the resin is pressed between two or more rolls including a metal roll which contacts the resin coated surface, and where the surface temperature of the rolls is retained at 30° C. to 150° C. and the pressure between the rolls is retained at for example, about 50 kg/cm to 350 kg/cm.
Further there is disclosed in U.S. Pat. No. 4,663,216 a synthetic paper printable comprised of (1) 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 thermo photographic resin containing 8 to 65 percent by weight of an inorganic fine powder.
Moreover, 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 said base layer, the laminate including a paper-like 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, said surface layer being constituted by a uniaxially stretched film made of a thermophotographic resin.
Also known is an electrostatic recording material comprised of a multi-layered sheet support having an electroconductive layer and dielectric layers formed thereon, reference for example U.S. Pat. No. 4,795,676.
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-xylylene terephthalate-co-malonate-co-sodioimino-bis[sulfonylbenzoate], dispersed in vinyl pyrrolidone polymer.
U.S. Pat. No. 4,997,697 discloses a transparent substrate material for receiving or containing an image which comprises a supporting substrate base, an antistatic polymer layer coated on one or both sides of the substrate and comprising hydrophilic cellulosic components, and a toner receiving polymer layer contained on one or both sides of the antistatic layer, which polymer comprises hydrophobic cellulose ethers, hydrophobic cellulose esters, or mixtures thereof, and wherein the toner receiving layer contains adhesive components.
Further, there is disclosed in U.S. Pat. No. 5,294,483 a method of providing a thin copolyester coating on paper which comprises extruding a thin copolyester coating on paper to form a coated sheet and passing the paper through a nip formed by a pair of cooperating chill and pressure rolls, wherein the copolyester consists essentially of repeat units of terephthalic acid, ethylene glycol, about 1.5-2.0 mol percent of an aliphatic or cyclo aliphatic glycol having 2 to 10 carbon atoms, and 0 to about 1.0 mol percent of a polyfunctional branching agent. Also disclosed is the coated paper prepared by this method.
Moreover, there is disclosed in U.S. Pat. No. 5,446,082 a water dispersible polyester composition for an image recording medium, comprising (1) a polyester having a glass transition temperature of not less than 40° C., a specific gravity of not less than 1.25, a value of SP of 9.5 to 12.0, and at least one kind of hydrophilic polar group, and which is insoluble in methyl ethyl ketone, toluene, and a mixed solvent thereof, wherein 65 percent by mole or more of a glycol component constituting the polyester is ethylene glycol, in a proportion of 5 to 50 percent by weight, (2) an organic compound compatible with water in a proportion of for example, 0 to 20 percent by weight, and (3) water in a proportion of 30 to 95 percent by weight all percentages by weight being based upon the total weight of said composition containing components (1), (2) and (3).
While the above prior art papers are suitable for their intended purposes, a need remains for improved paper particularly suitable for use in electrophotographic applications that employ heat for fixing inks and toners. In addition, a need remains for paper with excellent lightfast properties in the range of for example, from about 80 to about 95 percent, a feature not easily obtained especially considering that the total thickness of the coatings on each side of paper can range for example from about 2 to 25 microns and average about 15 microns. There is also a need for improved waterfast images on papers, and a need for paper with certain gloss values. Further, there is a need for paper coated with a discontinuous porous film which is further overcoated with a toner receiving layer to primarily prevent buildup of fuser oil from the fuser on the toned image. There is also a need for paper which, subsequent to being imaged with a toner, exhibits reduced curling. These and other needs are achievable with the paper of the present invention in embodiments thereof.
SUMMARY OF THE INVENTION
It is an feature of the present invention to provide papers with many of the advantages illustrated herein.
It is another feature of the present invention to provide papers capable of absorbing fuser oil particularly suitable for use in electrophotographic systems that employ oil containing fuser rolls that heat and fix the developed image.
It is another feature of the present invention to provide coated substrates such as coated papers with high optical density such as optical density values of about 1.50 to about 1.60 (cyan), about 1.35 to about 1.50 (magenta), about 0.95 to about 1.05 (yellow) and about 1.55 to about 1.70 (black), gloss values of between about 85 and about 90, about 100 percent waterfast for example, when washed with water for 2 minutes at 50° C. and about 100 percent lightfast for a period of three months without any change in their optical density.
It is yet another feature of the present invention to provide coated substrates wherein the color gamut is acceptable and does not substantially change over extended time periods.
It is yet another feature of the present invention to provide coated substrates that absorb fuser oil from the fuser and prevent its excessive buildup on the toned image.
Moreover, another feature of the present invention is to provide coated substrates with the combination of excellent lightfast properties, such as from about 90 to about 98, and wherein the color gamut is acceptable and does not substantially change.
These and other features of the present inventi
Malhotra Shadi L.
Naik Kirit N.
Grendzynski Michael E.
Hess Bruce H.
Palallo E. O.
Xerox Corporation
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