Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Reexamination Certificate
1999-06-29
2003-07-08
Hess, Bruce H. (Department: 1774)
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
Reexamination Certificate
active
06589633
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a sheet material for an advertisement. Particularly, the present invention relates to a sheet material for advertisement appropriate to recording ink images with a high quality by an ink jet printing method. More particularly, the present invention relates to a sheet material for advertisement which can display bright transmitted light images thereon by a internal lighting display system, and can optionally exhibit high flame retarding property, water resistance, a mildewproof property and sufficient durability for practical use.
Further, the present invention relates to a sheet material for advertisement usable as an outdoor advertisement sheet having a large surface area, a curing sheet for building and a decorating sheet, a hood sheet for truck, a sun-light shielding sheet, a shading tent and a hanging screen or sheet.
2. Description of the Related Art
Currently, an ink jet printer has become the object of public attention as a means for accurately and clearly recording images and photographs prepared and treated by a computer. Generally, in the ink jet printer, an aqueous ink having a low drying rate is employed to prevent the disadvantages in that the ink jetted through a nozzle is dried at the jetting end of the nozzle to cause the ink jetting nozzle to be blocked by the dried ink and to not work smoothly. When the aqueous ink is employed, however, falling of the ink in drops and dripping of the ink must be prevented, and thus an ink receiving surface of the ink jet recording material must exhibit a high ink-absorption and a high ink-drying rate. When the ink receiving layer has a low ink-absorption and the ink is dried at and fixed to a surface portion of the ink receiving layer, the resultant images displayed by the reflected light are sharp and clear. However, when the images are displayed by the light emitted from a light source located on the back side of the sheet on which the images are formed and transmitted through the sheet, the transmitted light-displayed images are disadvantageous in that the contours of the images are vague and the color density of the images is poor.
To obtain the ink images displayed by the transmitted light and having a high sharpness and clarity, the ink jet recording sheet must have an excellent ink-absorption in the direction of the thickness of the sheet and blotting and spreading of the printed ink dots along the surface plane of the recording sheet must be fully prevented or controlled.
There have been made attempts to enhancing the ink-absorption of the recording sheet and the resistance of the recording sheet to ink-blotting and spreading. Namely, Japanese Unexamined Patent Publication No. 60-248,387 discloses an ink jet recording material in which a water-absorbent material produced by a reaction of an isocyanate compound with a polyetherpolyol compound is used. This recording sheet is advantageous in the enhanced absorption of water in the aqueous ink. However, this recording sheet is disadvantageous in that the transmitted light-displayed images exhibit an unsatisfactory sharpness and clarity, the ink images have a poor water resistance and thus, when the printed sheet is placed in a high humidity condition, the ink receiving layer is peeled off from the substrate sheet, and the sharpness and clarity of the images are degraded.
To remove the above-mentioned disadvantages, it has been attempted to add a filler such as silica to the ink receiving layer. For example, Japanese Unexamined Patent Publication No. 8-67,065 discloses an ink receiving layer containing a quaternary ammonium salt compound and colloidal silica, and Japanese Unexamined Patent Publication discloses an ink receiving layer containing anhydrous silica. In the ink receiving layer of the former, since the colloidal silica particles are cationically charged, the agglomeration and connection of the silica particles with each other are difficult to control, the surface of the ink receiving layer cannot be formed into a microporous structure which contribute to enhancing the ink-absorption of the ink receiving layer, and the resultant ink images have a low sharpness and clarity when observed by the light transmitted through the recording sheet. Also, while the ink receiving layer of the former is appropriate to aqueous dye inks, aqueous pigment inks cannot form clear ink images on the ink receiving layer. Also, in the ink receiving layer of the latter, since the silica particles per se have a poor water-absorption, dripping and spreading of the ink applied to the ink receiving layer occur and thus sharp and clear ink images are difficult to record.
The sheet materials for advertisement must optionally have a high flame retardant property (a high flameproof property) and/or a high mildewproof property. When these properties are necessary, it is important that the necessary properties are attained without degrading the ink image recording property necessary for the sheet material for advertisement.
Particularly, when the sheet material is used as an outdoor advertisement sheet material at a high humidity, a generation of mildew may occur in addition to the usual problems such that the sharpness and clarity of the recorded images are degraded and the ink receiving layer is peeled off from the substrate sheet. To remove these disadvantages, it is known to add an organic mildewproofing agent and/or an inorganic mildewproofing agent to the ink receiving layer. The addition of the organic mildewproofing agent can effectively control the generation of mildew only in an early period. The mildewproofing effect decreases with the lapse of time. Also, the inorganic mildewproofing agent is disadvantageous in poor weathering properties and endurance thereof.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a sheet material for advertisement capable of recording thereon ink images having a high quality by an ink jet recording method.
Another object of the present invention is to provide a sheet material for advertisement capable of displaying clear images by an internal lighting apparatus in which the light is emitted from a light source located at the back side of the sheet material and is transmitted through the sheet material.
A further object of the present invention is to provide a sheet material for advertisement capable of recording ink images having high sharpness and clarity in a transmitted light display by an aqueous ink jet printing, while preventing a dripping and spreading of the aqueous ink, and having excellent weathering properties and endurance and optionally satisfactory flame-retardant (flameproof) property and/or mildewproof properties.
The above-mentioned object can be attained by the sheet material for advertisement of the present invention which comprises:
(A) a sheet substrate comprising at least one base fiber fabric; and
(B) at least one ink receiving layer formed on at least one surface of the sheet substrate and comprising:
(a) hydrated silica particles having an average primary particle size of 20 to 35 nm, an average secondary particle size of 2 to 7 &mgr;m, and a BET specific surface area of 50 to 170 m
2
/g,
(b) a water-holding material having a water-absorption ratio in weight of the water-holding material saturated with water to the that free from water of 5 to 50, and
(c) a binder comprising an acrylic resin.
In the sheet material for advertisement of the present invention, the sheet substrate (A) optionally further comprises a resinous coating layer formed on at least one surface of the base fiber fabric and comprising a synthetic resin.
In the sheet material for advertisement of the present invention, the base fiber fabric for the sheet substrate (A) preferably comprises at least one type of fibers selected from the groups consisting of natural organic fibers inorganic fibers, regenerated fibers, semi-synthetic fibers and synthetic fibers.
In the sheet material for advertisement of the present invention, the base fiber fabric for the
Ino Kazuhide
Suzuki Kenji
Arent Fox Kintner Plotkin & Kahn
Grendzynski Michael E.
Hess Bruce H.
Hiraoka & Co. Ltd.
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