Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Reexamination Certificate
1999-08-05
2001-12-04
Berman, Susan W. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
C522S101000, C522S104000, C522S107000, C522S179000, C522S178000, C522S181000, C522S182000, C427S533000, C427S534000, C427S536000, C347S001000
Reexamination Certificate
active
06326415
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ultraviolet (UV) radiation cured, glossy support useful in ink jet recording media. More particularly, the present invention relates to a substrate having a coating comprised of a UV radiation cured, glossy coating. When subjected to corona treatment, the glossy coating in the substrate provides a support layer for aqueous ink jet receiving layers with greatly enhanced adhesion, gloss and thermal processability. The glossy coating also functions excellently with solvent borne coatings without corona treatment, providing excellent adhesion to ink jet media coatings.
2. Description of Related Art
Since the advent of digital photography, the need for media providing photographic quality for ink jet printing applications has risen significantly. Ink jet printing is relatively inexpensive and the imaging can be of photographic quality. The printing resolution is such that, today, it is comparable to silver halide images. Moreover, the total cost of the imaging process, including media, is significantly less. However, the need to develop high quality, inexpensive, digital photographic imaging media for commodity ink jet printing exists.
Currently most of the glossy paper base media which meet this requirement for ink jet receiving layers are of the polyethylene extrusion coated type. These papers normally are comprised of two sided coatings of different molecular weight and density polyethylene. Many of these substrates are limited in gloss value and whiteness, and are costly and sensitive to the thermal processing for subsequent aqueous ink jet layer processing relative to the UV cured chemistry.
The term ink jet-receiving layer refers to the surface or coating on a substrate(paper or film) which receives the ink drops jetting from the printing head of an ink jet printer. Many types of ink jet media are available today (i.e., glossy, matte, canvas, etc.). Today's printing technology affords quality and resolution that yields images that are sharp, colorful and photorealistic. The “new” digital cameras can take images and download them into computers, which in turn can enhance the images and then print the image using ink jet technology on an ink jet glossy media resulting in a photographically realistic reproduction. The desired color image medium must afford silver halide photographic like properties in all its characteristics.
To obtain this photographic like ink jet image, the ink jet media must generally be glossy(>60%@ 20° angle), archivable (non yellowing@3-5 Yr. UV exposure), be water fast (coating does not come off after media exposed to water for 10 min.), must feel (have the hand) of a photograph, and must have excellent adhesion to the substrate. The currently available substrates, which give a high gloss after the coating of the ink jet-receiving layer, must be smooth to yield a glossy appearance. Substrates which have this smoothness are cast coated papers, latex coated papers, subbed polyester films, polyethylene extruded papers, polyethylene extruded/Gelatin subbed papers, and UV or Electron Beam cured coatings on paper.
European Patent Application EP 0 770 493 A1 describes a radiation cured glossy support layer and an ink jet material containing the same. However, many of these substrate surfaces do not meet the gloss requirement of a photograph after the ink jet receiving layers are applied, have poor adhesion to the ink jet receiving layer, are expensive to process, have various coating/drying process limitations, and/or are not archivable (yellowing on light aging 5 years exposure).
The industry is therefore in need of a support which can provide sufficient gloss, have good adhesion to the ink jet receiving layer and has good archival properties for photorealistic ink jet images.
SUMMARY OF THE INVENTION
Accordingly, an objective of the present invention is to provide a coating useful as a glossy support layer for an ink jet-receiving layer, that when applied to a high quality paper substrate will have close to identical photographic paper media properties (Whiteness, Brightness, Color-L*a*b*, Gloss, Yellowing or Fade resistance, and hand). The above objective is realized by a support comprising a substrate and a UV cured resinous coating layer on the substrate, with said resinous coating layer being comprised of a tetrafunctional polyester acrylate, a difunctional acrylic ester, a UV photoinitiator and a polyether. In particular, the media comprises a smooth white latex coated paper substrate with a resinous coating layer formed on the surface of the substrate, and cured by UV radiation. Currently the glossy ink jet paper bases mainly consist of polyethylene (PE) coatings which are applied by hot melt extrusion. In the present invention, the subsequent glossy layer is corona treated before an aqueous ink jet receiving layer is applied due to the low surface energy of the polyethylene. This results in enhanced adhesion to the aqueous ink jet receiving layer.
The UV cured glossy layer composition of the present invention is unique because only UV radiation can successfully cure the system and exposure to corona treatment promotes adhesion to the aqueous ink jet receiving layers. The resulting ink jet medium can be processed at much higher temperatures(>275° F.) than media made with current polyethylene coated substrates as digital ink jet photo bases. Solvent based and solvent modified aqueous coatings usually do not require a corona treatment. In addition, it has been frequently observed that ink jet coatings have much superior wet adhesion to these radiation cured coatings than to gelatin subbed polyethylene coated papers like F. Schoeller RG-250, whereon subbing wet swell can cause adhesion failure.
REFERENCES:
patent: 4649062 (1987-03-01), Kosiorek et al.
patent: 4935307 (1990-06-01), Iqbal et al.
patent: 4952486 (1990-08-01), Sack et al.
patent: 4960638 (1990-10-01), Mukoyoshi et al.
patent: 5405678 (1995-04-01), Bilodeau
patent: 5472757 (1995-12-01), Ogawa et al.
patent: 5780118 (1998-07-01), Tracy et al.
patent: 5910359 (1999-06-01), Kobayashi et al.
patent: 6020032 (2000-01-01), Romano, Jr. et al.
patent: 6089704 (2000-07-01), Burns et al.
patent: 0 770 493 (1996-10-01), None
Bennett Everett Wyman
Miklasiewicz Alexander J.
Vo Son T.
Berman Susan W.
Burns Doane Swecker & Mathis L.L.P.
Rexam Graphics Inc.
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