Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Reexamination Certificate
1997-08-29
2001-06-12
Hess, Bruce H. (Department: 1774)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
C428S195100, C428S409000, C427S146000
Reexamination Certificate
active
06245422
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a recording medium having a gloss surface layer.
2. Background Art
A gloss surface layer for smoothening the surface is sometimes provided on a recording media for use in recording with an ink composition to impart a high-quality feel or a photograph-like quality to the recorded image. An ink jet printer, especially a color ink jet printer, has made it possible to easily provide an image with high resolution, leading to a demand for a recording medium having a gloss surface layer suitable for use in ink jet recording.
Since the surface of the gloss surface layer is smooth, there is a fear of causing a failure of the recording medium with the gloss surface layer to be fed or carried in a printer. For example, when the recording medium is placed so as for the gloss surface layer to face a sheet feed roller of the printer, the sheet feed roller does not successfully engage with the smooth gloss surface layer and idled making it impossible to satisfactorily carry the recording medium. On the other hand, when the recording medium is placed so as for the gloss surface layer to face the sheet feed tray side of the printer, the gloss surface layer is adsorbed to the stacked sheets of the recording medium, causing a failure of the recording medium to be fed.
The conventional gloss surface layer has been produced by applying a mixture of silica with a binder onto the surface of a substrate by, for example, a casting method. For example, Japanese Patent Laid-Open No. 274587/1990 discloses a gloss surface layer comprising a pigment and a water-soluble binder. The pigment is composed mainly of synthetic silica and colloidal silica. Japanese Patent Laid-Open No. 117335/1995 discloses a gloss surface layer composed mainly of colloidal particles having an average particle diameter of not more than 300 nm. The claimed advantage is that use of silica can provide a gloss surface layer having good gloss.
So far as the present inventors know, however, no gloss surface layer using silica having considered geometry has been proposed in the art.
SUMMARY OF THE INVENTION
The present inventors have now found that incorporation of a mixture of spherical silica with nonspherical silica to the gloss surface layer can prevent a failure of a recording medium to be fed or carried in a printer without sacrificing the glossiness. The present invention has been made based on such finding.
Accordingly, an object of the present invention is to provide a recording medium having a gloss surface layer with good glossiness and possessing good feedability and carriability in a printer.
According to one aspect of the present invention, there is provided a recording medium comprising: a substrate; and a gloss surface layer on the substrate, the gloss surface layer comprising a spherical silica and a nonspherical silica.
REFERENCES:
patent: 4780356 (1988-10-01), Otouma
patent: 5576088 (1996-11-01), Ogawa et al.
patent: 5662997 (1997-09-01), Onishi et al.
patent: 0586846 (1994-03-01), None
patent: 0655346 (1995-05-01), None
patent: 0 705 710 (1996-04-01), None
patent: 60-219084 (1985-11-01), None
patent: 4-201286 (1992-07-01), None
Product Brochure, SNOWTEX-UP (Brochure 1), Mar. 1995.*
Product Brochure, SNOWTEX-UP (Brochure 3), Sep. 1988.
Itano Masaaki
Iwamoto Kiyoshi
Onishi Hiroyuki
Yoshizawa Senichi
Grendzynski Michael E.
Hess Bruce H.
Ladas & Parry
Seiko Epson Corporation & Tomoegawa Paper Co., Ltd.
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