Record receiver having plural interactive leaves or a colorless – Having plural interactive leaves
Reexamination Certificate
1998-12-01
2001-02-20
Hess, Bruce (Department: 1774)
Record receiver having plural interactive leaves or a colorless
Having plural interactive leaves
C428S304400, C428S331000, C428S913000, C428S914000
Reexamination Certificate
active
06191069
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sublimation-type thermal transfer image receiving sheet, and more particularly, to a thermal transfer image receiving sheet comprising the formation of a back layer, which can be written on with various types of pens and pencils, on the side opposite the surface on which is formed a dye receptive layer, said thermal transfer image receiving sheet being resistant to becoming electrically charged even in environments of low humidity, and can be separated even when printing is performed while mistaking the dye receptive layer side and back side.
Although various types of thermal transfer methods are known in the art, among these, a method has been proposed wherein a sublimable dye is used as a recording material, which is supported on a substrate sheet made of polyester and so forth to form a thermal transfer sheet, and various types of full-color images are formed on an image receiving sheet on which is formed a specific receptive layer made of a transfer material such as paper or plastic film that can be dyed with the sublimable dye. In this case, a thermal head of a printer is used as heating means. A large number of colored dots of 3 or 4 colors are transferred to an image receiving sheet by heating for an extremely short period of time, and full color-images of a manuscript are reproduced by said multi-colored dots. Images formed in this manner are extremely clear since the coloring materials used are dyes. Since these materials also have excellent transparency, the resulting images have excellent reproducibility and contrast of intermediate colors, and are similar to the images produced by conventional offset printing or gravure printing. Moreover, high-quality images can be formed that are comparable to full-color photographic images.
With respect to this type of thermal transfer image receiving sheet, the providing of a thermal transfer image receiving sheet that allows writing with a writing instrument such as a lead pencil or water-based pen by providing a back layer composed of polyvinylbutyral resin and microsilica is disclosed in the prior art, examples of which include Japanese Patent Application Laid-Open No. HEI 9-175048 and Japanese Patent Application Laid-Open No. HEI 9-175052. In addition, the providing of a thermal transfer image receiving sheet that can be separated even if printing is mistakenly performed on the back side by further providing a layer composed of polyvinyl alcohol and so forth is disclosed in Japanese Patent Application Laid-Open No. HEI 9-193561.
However, in the case of a thermal transfer image receiving sheet like that described above, since it is susceptible to becoming electrically charged in environments of low humidity, when printing with a printer and during feeding or discharging of paper, there is the disadvantage of problems occurring such as multiple sheets being fed through the printer at one time and paper jamming in the printer.
Thus, an object of the present invention is to provide a thermal transfer image receiving sheet having a constitution by forming a back layer that can be written on with various types of writing means on the side opposite the side on which is formed a dye receptive layer, said thermal transfer image receiving sheet being resistant to becoming electrically charged even in environments of low humidity, and being able to be separated without the back side adhering to the dye film even when printing is performed while mistaking the dye receptive layer side and back side.
DISCLOSURE OF INVENTION
In order to achieve the above object, the present invention according to a first embodiment is characterized by providing a thermal transfer image receiving sheet comprising a substrate sheet and a dye receptive layer on at least one side of said substrate sheet, wherein a hydrophilic porous layer having for its main components thermoplastic resin and hydrophilic porous particles is formed on the side where a dye receptive layer is not formed, and an electric conductive layer having for its main components cationic acrylic resin and cellulose acetate is formed on top of the above layer in this order.
In addition, the present invention according to a second embodiment is characterized by providing a thermal transfer image receiving sheet comprising a substrate sheet and a dye receptive layer on at least one side of a substrate sheet, wherein a hydrophilic porous layer having for its main components thermoplastic resin and hydrophilic porous particles is formed on the side where a dye receptive layer is not formed, and an electric conductive layer having for its main component cationic acrylic resin and a releasing layer having for its main component cellulose acetate are sequentially formed on the above layer in this order.
In addition, it is preferable that the thermoplastic resin of the above hydrophilic porous layer be either butyral or acetal resin.
In addition, it is preferable that the hydrophilic porous particles of the above hydrophilic porous layer are untreated microsilica have a pore volume of 0.2 to 3.0 ml/g and a mean particle diameter of 0.2 to 5.0 &mgr;m.
The heat transfer image receiving sheet of the present invention is that comprising a substrate sheet and a dye receptive layer on at least one side of the substrate sheet, wherein a hydrophilic porous layer having for its main components thermoplastic resin and hydrophilic porous particles is formed on the side opposite the side on which the dye receptive layer is formed, and an electric conductive releasing layer having for its main components cationic acrylic resin and cellulose acetate is formed on the above layer. Consequently, the hydrophilic porous layer in particular gives writing properties to the back layer. Moreover, since the cationic acrylic resin and cellulose acetate of the electric conductive releasing layer are essentially incompatible resins, this property of being mutually incompatible gives electrical conductivity and water absorption due to the cationic acrylic resin, and gives separating and water-resistant performance due to the cellulose acetate. Consequently, the back layer can be written on with various types of writing instruments, the sheet is resistant to becoming electrically charged even in environments of low humidity, and the back side can be separated without adhering to the dye film even when printing is performed while mistaking the dye receptive side and back side.
BEST MODE FOR CARRYING OUT THE INVENTION
The following provides a detailed explanation of the present invention by showing desirable modes for carrying it out.
Substrate Sheet
Synthetic paper (polyolefin-based, polystyrene-based, etc.), cellulose fiber paper such as high-quality paper, art paper, coated paper, cast coated paper, wall paper, paper for back stamping, synthetic resin or emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin-containing paper and cardboard, as well as various types of plastic films or sheets such as those made of polyolefin, polystyrene, polycarbonate, polyethylene terephthalate, polyvinyl chloride and polymethacrylate can be used for the substrate sheet used in the present invention. In addition, white opaque films formed by adding white pigment or filler to these synthetic resins or films having microvoids within the base material can also be used, and there are no particular limitations. In addition, laminates consisting of an arbitrary combination of the above substrate sheets can also be used.
Typical examples of laminates include laminates consisting of cellulose fiber paper and synthetic paper, or cellulose fiber paper and plastic film or sheet. The thickness of these substrate sheets is arbitrary, and a thickness on the order of, for example, 10 to 300 &mgr;m is typical. As described above, in the case the substrate sheet lacks adhesiveness with the receptive layer formed on its surface, it is preferable that simple adhesive treatment be performed on its surface such as primer treatment, corona discharge treatment or plas
Dai Nippon Printing Co. Ltd.
Hess Bruce
Parkhurst & Wendel L.L.P.
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