Stock material or miscellaneous articles – Article having latent image or transformation
Reexamination Certificate
1999-08-12
2002-04-09
Hess, Bruce H. (Department: 1774)
Stock material or miscellaneous articles
Article having latent image or transformation
C156S235000, C428S195100, C428S690000, C428S913000, C428S914000, C503S204000, C503S227000
Reexamination Certificate
active
06368684
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a fluorescent latent image transfer film, and a method for forming an fluorescent latent image by using this film, and more specifically to a fluorescent latent image transfer film making it possible to form any fluorescent latent image of any photograph, any pattern, any character or the like onto a transfer receiving material so as to form an image excellent in design and capability of preventing falsification; a method for transferring such a fluorescent latent image; and a security pattern formed matter having a fluorescent latent image.
In order to prevent forgery or falsification of a printed matter such as a document, a note or a card, there have hitherto been known means for forming a fluorescent latent image, which cannot be recognized through usual visible rays but emit fluorescence at the time of receiving ultraviolet rays so as to be recognized, into any pattern. In order to form this fluorescent latent image, there is usually used a method of printing the fluorescent latent image with a fluorescence developing ink.
Hitherto, as a simple printing method, a thermal transfer method has widely been used. This method makes it possible to form various images simply, so as to be used for the preparation of printed matters the print-number of which is a few, for example, cards such as an ID card.
A fluorescent latent image can be recorded onto a transfer receiving material, such as a card, by heating a thermal transfer film having a thermal transfer layer containing a fluorescent agent with a heating means such as a thermal head or a laser. The thermal transfer method includes sublimation type thermal transfer recording method and heat fusible type thermal recording method. In the sublimation type thermal transfer recording method, a sublimation dye is used and the dye is sublimated and transferred with the above-mentioned heating means. In the heat fusible thermal recording, there is used a heat fusible ink containing a colorant such as a pigment in a vehicle such as a wax, and ink in a heat fusible ink layer is softened with the heating means and the softened ink is transferred for recording.
In the heat fusible thermal recording, it is possible to form an image of a character, a number or the like easily and vividly. In the sublimation thermal transfer recording, gradiation-property is excellent, so that an image such as a facial photograph can be precisely and beautifully formed. The respective recording manners have such features.
Japanese Patent Application Laid-Open Nos. 2-106359, 6-316167, 7-223376, 7-117366 and the like disclose a sublimation thermal transfer film making it possible to record and form a fluorescent latent image having continuous gradation. These publications also describe various kinds of fluorescent compounds for forming a fluorescent latent image.
However, in the transfer film using the fluorescent compound described in the above-mentioned publications, and a method of using this transfer film to form a fluorescent latent image, there remains a problem that transferability of the fluorescent latent image and gradiation-property are not sufficient.
In the case that fluorescent ink is used to make a given pattern of the fluorescent ink by printing, the following problems arise.
(1) Since the fluorescent ink pattern is made by printing, a sufficient amount of the applied ink cannot be ensured. Thus, the degree of fluorescence color development is insufficient.
(2) If the amount of the applied ink is increased at the time of printing to obtain sufficient color development brightness, print reproduction of a minute pattern deteriorates. If the layer of the ink becomes thick, unevenness is generated in the raw matters subjected to printing-process. As a result, if the matters are long sheets, they may be subjected to blocking.
(3) In the case that the amount of a fluorescent pigment component is increased in a fluorescent pigment ink to raise the ratio of the fluorescent pigment to a binder resin which is a vehicle (abbreviated to the ratio of P/V hereinafter) and raise the luminescence intensity of a fluorescent latent image, accordingly, the print layer made of the ink whitens because of high concentration of the fluorescent pigment. Unfavorably, therefore, a portion where an image is printed with the fluorescent ink is easily recognized with eyes.
Japanese Patent application No. 4-319918 (Japanese Patent Application Laid-Open No. 6-166264) describes a method of using an ink containing an ultraviolet ray absorber to perform printing and forming on a sheet having a fluorescent latent image, thereby obtaining a fluorescent latent image having a specified pattern.
In this method, however, it is necessary to cause a support medium (a medium to be recorded) having a recording layer to contain a fluorescent material beforehand. For the formation of the pattern used the ultraviolet ray absorber, it is essential to use the special medium to be recorded which contains the fluorescent material. Thus, it is impossible to use plain paper to which such a processing is not applied. Therefore, the medium to be recorded is restrictive. This method cannot widely be used.
SUMMARY OF THE INVENTION
In the light of the above-mentioned problems in the prior art, an object of the present invention is to provide a fluorescent latent image transfer film making it possible to form a fluorescent latent image excellent in transferability and gradiation-property; a fluorescent latent image transfer method using the same; and a printed matter on which a fluorescent latent image is formed.
Another object of the present invention is to provide a security pattern formed matter making it possible to obtain sufficient brightness of a fluorescent latent image pattern, and recognize the fluorescent image easily without having a bad influence on the raw material of during printing-process.
In order to attain the above-mentioned objects, in the present invention there is provided a fluorescent latent image transfer film wherein a fluorescent ink layer formed of a resin binder comprising a fluorescent agent represented by the following formula (1) is formed on/above a heat-resistant substrate film.
wherein R1 is
(n is a positive integer),
and R2 and R3 each represents H or an alkyl group.
In the above described fluorescent latent image transfer film, the resin binder is composed mainly of a polyvinyl acetal resin, a polyvinyl butyral resin, or a mixture thereof.
In the fluorescent latent image transfer film, one or more layers selected from at least one of yellow, magenta, cyan and black thermal sublimation dye layers, and a heat fusible black ink layer are formed on and successively along a transfer face on which the fluorescent ink layer is formed.
In the fluorescent latent image transfer film, a protective layer is formed on and successively along the transfer face on which the fluorescent ink layer is formed.
In the fluorescent latent image transfer film, a thermal transfer intermediate adhesive layer is formed on and successively along the transfer face on which the fluorescent ink layer is formed.
In the fluorescent latent image transfer film, the total area of the formed yellow, magenta, cyan thermal sublimation dye layers, which is formed successively along the transfer face, is smaller than the total area, on/above the same substrate film, of layers selected from at least one of the thermal sublimation black layer, the heat-meting black ink layer, the fluorescent ink layer, the protective layer, and the thermal transfer intermediate adhesive layer.
In order to attain the above-mentioned objects, in the present invention there is provided a fluorescent latent image transfer method comprising the steps of putting, onto a transfer receiving material, a fluorescent latent image transfer film wherein a fluorescent ink layer formed of a resin binder comprising a fluorescent agent represented by the following formula (1) is deposited on/above a heat-resistant substrate film; heating the resultant in any pattern from the he
Onishi Jiro
Oshima Katsuyuki
Dai Nippon Printing Co. Ltd.
Hess Bruce H.
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