JP2000168243A - Fluorescent latent image transfer method and security pattern forming body - Google Patents

Abstract

(57) [Summary] (With correction) [PROBLEMS] To provide a fluorescent latent image transfer method and a printed matter capable of forming a fluorescent latent image excellent in transferability and gradation. Further, the present invention provides a security pattern forming body that can easily identify a fluorescent latent image. SOLUTION: A fluorescent latent image transfer film in which a fluorescent ink layer formed from a resin binder containing a fluorescent agent of the formula (1) is provided on one surface of a heat-resistant base film, It is superposed so that the transfer surface of the transfer object is in contact with it, and heated from the heat-resistant base film side of the fluorescent latent image transfer film by the heating element, and the fluorescent ink layer of the fluorescent latent image transfer film is transferred to the transfer object. Thus, a print was obtained by forming a fluorescent latent image. Further, the security pattern is composed of a fluorescent material layer and an ultraviolet ray absorbing pattern above the fluorescent material layer, using an intermediate transfer medium in which the receiving layer, the ultraviolet ray absorbing pattern and the fluorescent material layer are formed as a transfer layer,
A security pattern formed body was obtained on the surface of the transferred body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a fluorescent latent image by using a thermal transfer film, and more particularly, to forming a fluorescent latent image such as an arbitrary photograph, pattern or character on a transfer object to prevent tampering. The present invention relates to a fluorescent latent image transfer method capable of forming an image excellent in design and design, and a security pattern forming body provided with a fluorescent latent image.

[0002]

2. Description of the Related Art Conventionally, in order to prevent forgery or tampering of printed matter such as documents, cash vouchers, cards, etc., it cannot be recognized by ordinary visible light or the like. For this purpose, means for providing a fluorescent latent image in an arbitrary pattern is known. In order to form the fluorescent latent image, generally, a method of printing using a fluorescent coloring ink is generally used.

Conventionally, a thermal transfer method has been widely used as a simple printing means. Since this method can easily form various images, it is used for producing printed matter having a small number of printed sheets, for example, cards such as an ID card.

A fluorescent latent image can be recorded on a transfer object such as a card by a heating means such as a thermal head or a laser using a thermal transfer film having a thermal transfer layer containing a fluorescent agent. The transfer method includes a sublimation type thermal transfer recording method and a heat melting type thermal recording method. The sublimation type thermal transfer recording method uses a sublimable dye, and the dye is sublimated and transferred by heating by the above-mentioned heating means. The hot-melt recording method uses a hot-melt ink containing a coloring agent such as a pigment in a vehicle such as a wax.The ink of the hot-melt ink layer is softened by heating means, and the softened ink is removed. The recording is performed after the transfer.

[0005] The heat melting type thermal recording method can easily and clearly form images such as characters and numerals.
Each of the sublimation type thermal transfer methods has a feature that it is excellent in gradation expression and can form an image such as a face photograph precisely and beautifully.

As sublimation type thermal transfer films capable of recording and forming a continuous tone fluorescent latent image, Japanese Patent Application Laid-Open Nos. 2-106359, 6-316167, and 7-223
376, JP-A-7-117366 and the like. These publications describe compounds of various fluorescent agents for forming a fluorescent latent image.

[0007]

However, in the method of forming a fluorescent latent image using a transfer film using the compound of the fluorescent agent described in the above-mentioned publication, the transferability and gradation of the fluorescent latent image are still unsatisfactory. There was a problem that it was insufficient.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has a fluorescent latent image transfer method capable of forming a fluorescent latent image excellent in transferability and gradation, and a method for forming a fluorescent latent image. The purpose is to provide prints.

Further, when a predetermined pattern is printed by using a fluorescent ink to provide a fluorescent ink pattern, the following problem occurs. Since a fluorescent ink pattern was formed by printing, a sufficient coating amount could not be secured, and the degree of fluorescent coloring was insufficient. When printing is performed by increasing the coating amount in order to obtain the coloring luminance, print reproducibility of a fine pattern is reduced. Further, when the thickness is increased, irregularities are generated in the raw material when printing is performed, and there is a possibility that long sheets will be blocked. In a fluorescent pigment ink, when the fluorescent pigment (Pigment) component is increased and the ratio of the fluorescent pigment to the binder resin (Vehicle) (hereinafter referred to as P / V ratio) is increased to increase the emission intensity of the fluorescent latent image, Since the concentration of the fluorescent pigment is high, the printed layer is whitened, and the portion printed with the fluorescent ink is easily visually confirmed.

Japanese Patent Application Laid-Open No. Hei 6-166264 describes a method of obtaining a fluorescent latent image of a specific pattern by printing and forming on a sheet having a fluorescent latent image using an ink containing an ultraviolet absorber. ing. However, in this method, the support (recording medium) having the recording layer needs to contain a fluorescent material in advance, and the pattern formation with the ultraviolet absorber must use a special recording medium containing the fluorescent material. In particular, ordinary paper without such processing cannot be used. Therefore, the recording medium is limited and has no versatility.

An object of the present invention is to provide a security pattern forming body which can obtain a sufficient color luminance of the fluorescent latent image pattern, does not adversely affect the raw material during processing, and can easily identify the fluorescent latent image. Aim.

[0012]

According to the present invention, there is provided a fluorescent material comprising: (1) a fluorescent ink layer formed from a resin binder containing a fluorescent agent represented by the formula (1) on a heat-resistant base film. The latent image transfer film is superimposed on the object to be transferred, and is heated to an arbitrary pattern by a heating element from the heat-resistant base film side of the fluorescent latent image transfer film, and a fluorescent latent image corresponding to the pattern of the heating element is transferred to the object to be transferred. Transferring a fluorescent ink layer of a transfer film to form a fluorescent latent image comprising a fluorescent agent on a transfer target body, a method for transferring a fluorescent latent image,

Embedded image (2) The method for transferring a fluorescent latent image according to the above (1), wherein a fluorescent latent image is formed after forming an image with visible ink on the surface of the transferred object, and (3) the fluorescent latent image is formed on the surface of the transferred object. (1) The method for transferring a fluorescent latent image according to the above (1), wherein an image using visible ink is formed later; (4) The method for forming a fluorescent latent image during the formation of an image using visible ink on the surface of an object to be transferred; (5) The method for transferring a latent image to a fluorescent layer according to any one of the above (1) to (4), wherein a protective layer is formed on the outermost surface; Thereafter, a protective layer is formed, and the fluorescent latent image transfer method according to the above (2), wherein a fluorescent latent image is formed on the surface of the protective layer, (7) at least one of yellow, magenta, cyan, and black colors Heat-sublimable dye layer, hot-melt black ink layer or protective layer Using a fluorescent ink layer-integrated film in which one or more of the exposed layers are provided on the same transfer surface as the fluorescent ink layer one by one, a fluorescent ink image and a protective layer are continuously formed with visible ink. (1) to (6) above
The method for transferring a fluorescent latent image according to any one of the above items. (8) The above (5) to (5) in which the hologram pattern is formed on the protective layer.
(7) The method for transferring a fluorescent latent image according to any one of (7) and (9).
The method according to any one of the above (1) to (8), wherein the object to be transferred is a card, and (10) the method according to any one of the above (1) to (8), wherein the object to be transferred is a passport. (11) The method for transferring a fluorescent latent image according to any one of the above (1) to (8), wherein the object to be transferred is a license, and (12) the method for transferring a fluorescent latent image according to the above (1) to (8). (11) a print, wherein a fluorescent latent image is formed by the fluorescent latent image transfer method according to any one of (11), (13) a receiving layer on which information is recorded on at least the surface of a transfer-receiving body, and In a printed material provided with a security pattern based on a fluorescent latent image, the security pattern includes a fluorescent material layer and an ultraviolet absorbing pattern provided in a pattern above the fluorescent material layer. Layer, UV absorption pattern and fluorescence (14) Ultraviolet rays, wherein an intermediate transfer medium in which a material layer is formed as a transfer layer is used, and a transfer layer of the intermediate transfer medium is transferred and provided on the surface of an object to be transferred. Absorption pattern, using an ultraviolet absorber transfer film provided with an ultraviolet absorber layer, heating the transfer film to an arbitrary pattern by a heating element, and transferring the ultraviolet absorber layer according to the pattern of the heating element. (1)
(13) or (13) above, wherein the security pattern forming body according to (3), wherein the fluorescent material layer is formed using a fluorescent latent image transfer film having a fluorescent ink layer made of a resin binder containing a fluorescent agent. (14) An intermediate transfer medium provided with a transfer layer having a receiving layer in which a fluorescent latent image formed of an ultraviolet absorption pattern and a fluorescent material layer and information are recorded is provided on a base film. A method for forming a security pattern by transferring a transfer layer of the intermediate transfer medium to a transfer object, wherein the intermediate transfer medium has an ultraviolet absorption pattern in a transfer layer after transfer positioned above a fluorescent ink layer. (17) A method for forming a security pattern, characterized in that a fluorescent latent image is formed as described above, Postal layer, the adhesive layer is in the thermal transfer medium provided sequentially face, and gist dye transfer film, which is characterized by containing a fluorescent material on the adhesive layer.

In the present invention, the image includes all images that can be recorded as information, such as continuous-tone images such as photographs, and single-color or multicolor prints without characters, symbols, and patterns. In addition, the fluorescent latent image transferred and formed from the fluorescent ink layer is invisible under normal visible light, but an ultraviolet absorption image is visible when irradiated with ultraviolet light. In order to prevent such a problem, a secret code or a code that can be used for authentication can be used. Specifically, any of photographic prints having gradations, characters without gradations, illustrations, and abstract patterns can be used. The image in the visible ink (sometimes referred to as a visible image) refers to an image that can be viewed in a normal state formed by a general printing method or a transfer method with respect to the fluorescent latent image.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, a fluorescent latent image transfer method according to the present invention comprises a fluorescent latent layer having a fluorescent ink layer 3 formed on one surface of a heat-resistant base film 2 from a resin binder containing a fluorescent agent. An image transfer film 1 is used, and the fluorescent latent image transfer film 1 is superimposed on a transfer object so that a fluorescent ink layer and a transfer surface are in contact with each other. From the heating element to an arbitrary pattern, the fluorescent ink layer 3 of the fluorescent latent image transfer film corresponding to the pattern of the heating element is transferred to a transfer target, and an arbitrary fluorescent latent image made of a fluorescent agent is transferred to the transfer target. Is formed.

First, the fluorescent latent image transfer film used in the method of the present invention will be described below. The heat-resistant base film 2 of the fluorescent latent image transfer film 1 only needs to have heat resistance to heat at the time of transfer, and a certain strength and dimensional stability. For example, paper, various processed papers, A plastic film or the like is used. As the material of the plastic film, polyester such as polyethylene terephthalate, polystyrene, polypropylene, polysulfone,
Examples include polyphenylene sulfide, polyethylene naphthalate, 1,4-polycyclohexylene dimethyl terephthalate, aramid, polycarbonate, polyvinyl alcohol, cellophane, and the like. The thickness of the heat-resistant base film 2 is preferably 0.5 to 50 μm, and more preferably 3 to 10 μm. A preferred material is a polyethylene terephthalate film.

The heat-resistant base film 2 may be a single-wafer type or a continuous film. Further, the surface of the heat-resistant base film 2 may be subjected to a primer treatment or the like for improving the adhesiveness to a fluorescent ink layer or another layer provided on the film. On the other side of the fluorescent latent image transfer film 1, a back layer 4 is provided.

The fluorescent agent used in the fluorescent ink layer 3 is a compound represented by the formula (1). Specific examples of the compound include compounds shown in Table 1. Among the above compounds, Rl in the formula (1) is thiophene, R2 and R
The compound in which 3 is a t-butyl group is particularly preferable because it can form a fluorescent latent image having better transferability and gradation.

[0018]

[Table 1]

The binder resin used for the fluorescent ink layer 3 is a cellulose resin such as ethyl cellulose, ethyl hydroxy cellulose, hydroxypropyl cellulose, methyl cellulose, cellulose acetate, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral,
Vinyl resins such as polyvinyl acetal and polyvinyl pyrrolidone, acrylic resins such as poly (meth) acrylate and poly (meth) acrylamide, polyurethane resins,
Examples thereof include polyamide resins, polyester resins, and mixtures of these resins. As the binder resin, polyvinyl butyral and polyvinyl acetal are preferable because of good migration of the fluorescent agent and good storage stability when used as a transfer film. The thickness of the fluorescent ink layer 3 is 0.
It is preferable to form it at ¹ to 5.0 g / m ² .

The fluorescent ink layer 3 can be formed by applying an ink to which a fluorescent agent, a binder resin, and other additives are added by using a known coating method such as gravure coating.

The back layer 4 is provided to prevent fusion with a heating element such as a thermal head or to improve paper feedability. Further, when the transfer film is wound into a roll or the sheets are stacked, the back layer 4 can prevent the back surface from adhering to the surface layer such as the fluorescent ink layer. The back layer 4 preferably has heat-resistant lubrication and release properties. Examples of the material of the back layer include materials having releasability such as curable silicone oil, curable silicone wax, silicone resin, fluororesin, and acrylic resin. The thickness of the back layer 4 is usually formed to be 0.1 to 3.0 μm.

The fluorescent latent image transfer film may be in any state of a sheet, a continuous roll, and a ribbon. The fluorescent latent image transfer film shown in FIG. 1 has a fluorescent ink layer 3 formed by solid printing on the entire surface of the transfer layer. Regions such as the sublimable dye layer 5 and the hot-melt ink layer 6 may be formed face-sequentially along the sheet flow direction. Further, a region of the protective layer 7 may be provided. Hereinafter, other embodiments of the fluorescent latent image transfer film will be described.

The fluorescent latent image transfer film 1 shown in FIG. 2 has a yellow dye layer 5Y and a magenta dye layer 5 on the same transfer surface of the heat-resistant base film 2 on which the fluorescent ink layer 3 is provided.
M, a sublimable dye layer 5 such as a cyan dye layer 5C and a black dye layer 5BK, a fluorescent ink layer 3, and a black heat-meltable ink layer 6B are formed in a plane-sequential manner. It is formed repeatedly in the direction of film flow. On the other side of the heat-resistant base film 2, a back layer 4 is provided. In this embodiment, the transfer layers other than the fluorescent ink layer 3 include a yellow dye layer 5Y, a magenta dye layer 5M, a cyan dye layer 5C, a black dye layer 5BK,
It is sufficient that at least one or more of the black heat-meltable ink layers 6 (heat-meltable black ink layers 6BK) are provided on the same transfer surface as the fluorescent ink layer 3.

FIGS. 3 (a) to 3 (h) are plan views showing an embodiment in which a thermosublimable dye layer 5 and a thermofusible ink layer 6 are provided as layers other than the fluorescent ink layer of the fluorescent latent image transfer film. is there. As shown in the figure, the areas (also called panels) of the fluorescent ink layer 3, the heat sublimable dye layer 5 (5Y, 5M, 5C, 5BK), the heat-meltable ink layer 6, and the like are formed in an arbitrary order. Can be. Further, the length of each region is not particularly limited, and can be formed as a region having an arbitrary length. FIG.
In the modes (a) to (h), the arrangement order of the regions in the plane direction is as follows, and the regions are repeatedly formed in the flow direction using the configuration of the regions as a basic unit.

(A) A solid film comprising only the fluorescent ink layer 3. (B) Yellow dye layer 5Y, magenta dye layer 5M, cyan dye layer 5C, and fluorescent ink layer 3. (C) Yellow dye layer 5Y, magenta dye layer 5M, cyan dye layer 5C, black dye layer 5BK, and fluorescent ink layer 3. (D) Yellow dye layer 5Y, magenta dye layer 5M, cyan dye layer 5C, fluorescent ink layer 3, and heat-meltable black ink layer 6BK. (E) Black dye layer 5BK, fluorescent ink layer 3. (F) Fluorescent ink layer 3, hot-melt black ink layer 6B
K. (G) Yellow dye layer 5Y, magenta dye layer 5M, cyan dye layer 5C, black dye layer 5BK, fluorescent ink layer 3, and heat-meltable black ink layer 6BK. (H) In the same order of the areas as in (g) above, the total occupied area of the areas of the yellow dye layer 5Y, the magenta dye layer 5M, and the cyan dye layer 5C is represented by the black dye layer 5BK, the fluorescent ink layer 3, It was formed smaller than the area occupied by the region of the fusible black ink layer 6BK.

The heat sublimable dye layer 5 is prepared by dissolving a yellow, magenta, cyan or black sublimable dye, a binder resin, a release agent, and other additives in a solvent to prepare a coating solution for the dye layer. Then, it can be formed by applying a coating solution of each color to a predetermined region on the heat-resistant base film using various coating means such as a gravure coat and drying.

Yellow sublimable dyes include Foron Brilliant Yellow-S-6GL (trade name of Disperse Yellow 231 manufactured by Sando Co., Ltd.) and Macrolex Yellow 6G
(Product name of Bayer Disperse Yellow 201)
And the like. Magenta sublimable dye is MS-RED
G (trade name of Disperse Violet 26 manufactured by Bayer AG) and the like. As the cyan sublimable dye, Kayaset Blue 714 (Solvent Blue 6 manufactured by Nippon Kayaku Co., Ltd.)
3), Foron Brilliant Blue SR (trade name of Disperse Blue 354 manufactured by Sando), Waxolin AP-FW (trade name of Solvent Blue 36 manufactured by ICI), and black sublimable dyes include: Mixtures of the above yellow, magenta, and cyan dyes, and the like.

As the binder resin of the heat sublimable dye layer 5, ethyl cellulose, ethyl hydroxy cellulose,
Cellulose resins such as hydroxypropylcellulose, methylcellulose and cellulose acetate; polyvinyl resins such as polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal and polyvinylpyrrolidone; acrylic resins such as poly (meth) acrylate and poly (meth) acrylamide Resins (the above (meth) means methacrylate), polyurethane resins, polyamide resins, polyester resins, and mixtures of these resins. As the binder resin, polyvinyl butyral and polyvinyl acetal are preferred because of their good dye transferability and good storage stability when used as a transfer film.

The hot-melt ink layer 6 is formed by coating a hot-melt ink containing a colorant, a vehicle, and other additives with a hot melt coat, a hot lacquer coat, a gravure coat, a gravure reverse coat, a roll coat, or the like. It can be formed using a known coating means. The thickness of the hot-melt ink layer 6 is usually formed to be 0.2 to 10 μm. For the heat-fusible ink layer, it is preferable to use a black colorant that is optimal for recording high-density and clear characters and symbols.

The vehicle of the hot-melt ink layer 6 includes
For example, a wax, a mixture of a wax and a derivative of a drying oil, a resin, a mineral oil, a cellulose, a rubber and the like can be mentioned. The waxes include microcrystalline wax, carnauba wax, paraffin wax, Fischer-Tropsch wax, low molecular weight polyethylene, wood wax, beeswax, whale wax, Ibota wax, wool wax, shellac wax, candelilla wax, petrolatum, partially modified wax, fatty acids Examples include esters and fatty acid amides.

The fluorescent latent image transfer film is shown in FIGS.
As shown in (i), the protective layer 7 as a layer other than the fluorescent ink layer 3 may be formed on the same transfer surface as the fluorescent ink layer 3 in a sequential manner. 4A to 4I, the arrangement order of the regions in the plane direction is as follows, and the regions are repeatedly formed in the flow direction using the configuration of the regions as a basic unit. ing. (A) Fluorescent ink layer 3 and protective layer 7. (B) Yellow dye layer 5Y, magenta dye layer 5M, cyan dye layer 5C, fluorescent ink layer 3, and protective layer 7. (C) Yellow dye layer 5Y, magenta dye layer 5M, cyan dye layer 5C, black dye layer 5B, fluorescent ink layer 3,
Protective layer 7. (D) Yellow dye layer 5Y, magenta dye layer 5M, cyan dye layer 5C, fluorescent ink layer 3, heat-meltable black ink layer 6BK, and protective layer 7. (E) Black dye layer 5BK, fluorescent ink layer 3, protective layer 7. (F) Fluorescent ink layer 3, hot-melt black ink layer 6B
K, protective layer 7. (G) Yellow dye layer 5Y, magenta dye layer 5M, cyan dye layer 5C, black dye layer 5BK, fluorescent ink layer 3, hot-melt black ink layer 6BK, and protective layer 7. (H) In the same order of the areas as in (g) above, the total occupied area of the areas of the yellow dye layer 5Y, the magenta dye layer 5M, and the cyan dye layer 5C is represented by the black dye layer 5BK, the fluorescent ink layer 3, The area occupied by the fusible black ink layer 6BK and the protective layer 7 was smaller than the occupied area. (I) Hot-melt black ink layer 6BK, protective layer 7, yellow dye layer 5Y, magenta dye layer 5M, cyan dye layer 5C, fluorescent ink layer 3, hot-melt black ink layer 6B
K, protective layer 7.

In FIG. 4, the positions of the panels except for the protective layer may be in any order. However, the panel order of the fluorescent ink layer 3 may be after the protective layer. When the transfer is performed directly from the transfer film to the transfer-receiving body, the protective layer 7 is positioned on the outermost surface of the transferred image to protect the image satisfactorily.
As shown in (a) to (i), it is generally preferable to provide the region at the last position in one structural unit provided in a plane-sequential manner. Further, as shown in FIG. 4 (i), the protective layer 7 is provided, for example, at two places, that is, after the hot-melt black ink layer 6BK and at the last position of the area unit, so as to form one plane-sequential structural unit. May be provided in two or more regions.

The protective layer 7 can be formed by applying a coating composition containing a resin for forming a protective layer of this type of transfer film to the surface of a film substrate by a known coating means. The protective layer 7 is formed to be transparent such as colorless transparent or colored transparent such that the image of the lower layer can be seen after transfer. As the resin for forming the protective layer, for example, a simple substance or a mixture of resins such as polyester, polystyrene, acrylic, polyurethane, and acrylic urethane, a resin obtained by modifying these resins with silicone, a mixture of these modified resins, an ionizing radiation-curable resin, and an ultraviolet ray And a barrier resin. The thickness of the protective layer 7 is usually formed to be about 0.5 to 10 μm.

The protective layer containing the ionizing radiation-curable resin has particularly excellent plasticizer resistance and abrasion resistance. As the ionizing radiation-curable resin, known resins can be used.For example, a radically polymerizable polymer or oligomer is cross-linked and cured by ionizing radiation, and a photopolymerization initiator is added as necessary, and an electron beam or Those polymerized and cross-linked by ultraviolet rays can be used.

The main purpose of the protective layer containing the ultraviolet-blocking resin is to impart light resistance to the print. As the ultraviolet blocking resin, for example, a resin obtained by reacting and bonding a reactive ultraviolet absorber to a thermoplastic resin or the above ionizing radiation curable resin can be used. Reactive UV absorbers include salicylate, benzophenone, benzotriazole, substituted acrylonitrile, nickel-
Non-reactive organic UV absorbers such as chelate-based and hindered-amine-based UV absorbers include addition-polymerizable double bonds (eg, vinyl, acryloyl, methacryloyl, etc.), alcoholic hydroxyl, amino, carboxyl, epoxy And a reactive group such as an isocyanate group.

A hologram pattern or the like can be formed on the protective layer 7. The hologram pattern includes a relief hologram pattern. Further, as other patterns, an uneven pattern of a diffraction grating or the like may be used.

In a fluorescent latent image transfer film provided with a layer other than the fluorescent ink layer 3 as a transfer layer in a plane-sequential manner and provided with a plurality of layer regions, the length of each region (or the area of the region) is the same. The transfer film may be formed so that the area of each layer has the same area as in FIG. 3 (h) and FIG.
As shown in the embodiment (h), the length of the area of the yellow, magenta, and cyan thermosublimable dye layers 5 (5Y, 5M, and 5C) is reduced so that the occupied area of the dye layers 5 is reduced. Layers other than layers (fluorescent ink layer 3, thermosublimable black dye layer 5B
K, the hot-melt black ink layer 6BK, the protective layer 7, etc.) can be formed to be smaller than the occupied area.

FIGS. 5 and 6 are sectional views showing an embodiment of a printed matter formed by the method for forming a fluorescent latent image transfer film of the present invention. The print 9 shown in FIG. 5 has a fluorescent latent image 11, a color transfer image 12 using a sublimable dye, a single-color transfer image 13 using a sublimable dye, and a single-color transfer using a hot-melt ink on the surface of a transfer object 10. A visible image such as the image 14 is provided, and its surface is covered with a protective layer 15.

The print 9 shown in FIG. 6 has a color transfer image 12 using a sublimable dye, a single color transfer image 13 using a sublimation dye, a single color transfer image 14 using a hot-melt ink, and the like on the surface of the transfer object. After providing the visible image of the protective layer 15
Is formed so as to cover the entire image surface, and the protective layer 15 is formed.
Is provided with a fluorescent latent image 11 on the surface thereof.

In the method of the present invention, the timing of forming the fluorescent latent image 11 is either (a) after forming the visible image, (b) before forming the visible image, or (c) during forming the visible image. May be. In the case of the above (a), the position where the fluorescent latent image 11 is formed is a position that does not overlap with the visible image,
It may be provided at any position overlapping the visible image, and in the case of the above (b), any position may be used as long as it does not overlap the visible image.

When the protective layer 15 is formed, as shown in FIG. 5, when the visible image and the fluorescent latent image 11 are entirely covered and formed on the outermost surface of the print 9, the storability of the print image is improved. Is most preferable, and is most suitable for a card or the like which requires durability such as abrasion resistance. When the fluorescent latent image 11 is provided on the surface of the protective layer 15 as shown in FIG.
If the fluorescent latent image is about the same thickness as the fluorescent ink layer formed on the transfer film, it does not hinder the visual image of the lower layer from being seen at all, and therefore can be formed without any problem even above the visible image, There is an advantage that there is no restriction on the formation position. As described above, the formation position, the formation order, and the like of the fluorescent latent image, the visible image, the protective layer, and the like of the print can be appropriately selected according to the use of the print to be used.

The above visible image and the protective layer are formed by a printing method,
It can be formed by a coating method, a transfer method using another transfer sheet, or the like. However, the sublimable dye layer, the hot-melt transfer layer, or the protective layer, which has been described above, is surface-sequential to the fluorescent ink layer. It is preferable to use the transfer film provided on the substrate since an image formed by a sublimable dye layer and a protective layer can be continuously formed in addition to the fluorescent latent image.

The sublimable dye layer of such a fluorescent latent image transfer film has a continuous tone image such as a full-color photograph,
It is optimally used to form continuous-tone images such as single-color photographs, but can also produce single- and multi-color images without gradation. The hot-melt black ink layer is optimally used for printing characters and codes without gradation.

As the transfer object 10 on which the print 9 is formed, a thermal transfer image receiving sheet is preferably used. The thermal transfer image-receiving sheet has a structure in which a receiving layer is provided on the surface of a base material. The base material is plain paper, synthetic paper, paper such as synthetic resin or emulsion impregnated paper, saturated polyester such as polyethylene terephthalate, polyamide, polyethylene,
Examples include plastic sheets (including films) such as polypropylene, polyacrylate, polycarbonate, polyurethane, polyvinyl chloride, polyvinyl acetate, polystyrene, cellulose resin, polysulfone, and polyimide. The substrate may be transparent or opaque,
Further, the base material may have reflectivity by adding a white pigment or the like. Further, the base material may be formed in a card shape.

The receiving layer of the thermal transfer image-receiving sheet is formed from a dye-dyeable resin. Dye-dyeable resin, for example, saturated polyester, polyamide, polyacrylate,
Polycarbonate, polyurethane, polyvinyl acetal, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polystyrene, styrene-acryl copolymer, styrene-butadiene copolymer, vinyl toluene-acryl copolymer, cellulose Resins. These resins may be used alone or in combination of two or more. Further, the receiving layer may contain additives such as a release agent and various coloring agents for preventing fusion of the thermal transfer sheet.

On the back side of the thermal transfer image-receiving sheet (the side opposite to the receptor layer), silicone oil, a fluorine compound,
A release layer made of various waxes or the like may be provided.

These thermal transfer image-receiving sheets may be in a state where they are not printed at all, or may be formed in the form of paper, booklets, forms, or the like, which are printed and formed in advance.

As a heating element used for transferring an image such as a fluorescent latent image transfer film or another sublimable dye transfer sheet or a protective layer transfer sheet, a heating means such as a thermal head or a laser is used. It is formed so that heating according to the information is performed. Commercially available heating elements can be used for these heating elements.

The fluorescent latent image transfer method of the present invention can be applied to identification cards such as ID cards and cards such as credit cards,
It can be used optimally to form certificates with photos and characters such as passports and licenses.

In the above-described fluorescent latent image transfer method, a fluorescent ink image is formed by transferring the fluorescent ink layer in a pattern onto a transfer substrate (recording medium). In this method, when a binder capable of being melt-transferred is used for the fluorescent ink layer, both the binder resin and the above-described specific fluorescent agent migrate to the transfer target to form a fluorescent latent image. In addition, when a binder resin that is not melt-transferred is used, since the above-described fluorescent agent of the fluorescent ink layer has sublimability, only the fluorescent agent migrates to the transfer-receiving substrate to form a fluorescent latent image. .

In general, in the case of sublimation transfer, the gradation expression is excellent. However, compared with the fusion transfer, the amount of transfer of a dye or a fluorescent agent is small, and the density of the formed image is low. Is disadvantageous. Therefore, in the above-described transfer method, when importance is placed on gradation, a sublimation transfer method is selected, and in order to obtain sufficient luminance of the fluorescent latent image, a method of transferring the fluorescent ink layer by a melt transfer method is used.

As described in the section of the object of the present invention, even when the melt transfer method is selected, the fluorescent ink layer of the fluorescent latent image transfer film is transferred to the transfer-receiving substrate in a pattern to form the fluorescent latent image. However, there is a limit to increasing the concentration of the fluorescent agent in the method for forming the fluorescent material. In such a case, the following fluorescent latent image forming method can be used.

For example, as shown in FIG.
1, an intermediate transfer medium 30 in which a release layer 32, an ultraviolet absorbing pattern 33, and a receptor layer 34 on which information can be recorded by dye ink are sequentially provided, and a yellow ink layer 22Y and a magenta Ink layer 22
M, a cyan ink layer 22C, a heat-sublimable black ink layer 22BK (these ink layers are referred to as a dye ink layer 22), and a release layer 23 are provided in the order of the surface.
Using the dye transfer film 20 on which the fluorescent adhesive layer 24 formed of an adhesive ink containing a fluorescent material is formed, the steps shown in FIGS. 14A to 14C are performed to form a security pattern. Recording medium (security pattern forming body 51) can be formed.

As shown in FIG. 14A, information is recorded by forming a visible image 35 by sublimation transfer in a predetermined pattern using the dye ink layer 22 of the dye transfer film on the receiving layer 34 of the intermediate transfer medium. I do. Next, as shown in FIG.
A fluorescent adhesive layer 24 of a dye transfer film is placed on the receiving layer.
Is transferred onto the entire surface by melt transfer, and an intermediate transfer medium 30 in which a release layer 32, an ultraviolet absorbing pattern 33, a receiving layer 34, and a visible image 35 are provided as a transfer layer 36 on a base film 31.
To form Finally, as shown in FIG. 3C, the transfer layer 36 of the intermediate transfer medium 30 is transferred to the surface of the transfer object 50, and the fluorescent adhesive layer 24 and the ultraviolet rays located above the fluorescent adhesive layer are transferred. A security pattern forming body 51 having a fluorescent latent image including the absorption pattern 33 and the visible image 35 is obtained.

The ultraviolet light is absorbed by the ultraviolet absorption pattern 33 located above the fluorescent adhesive layer 24 when the security pattern forming body of FIG. 14C is irradiated with ultraviolet light from above the surface. As a result, the fluorescent image obtained by the ultraviolet irradiation is a negative image of the ultraviolet absorption pattern 33.

The above-described fluorescent latent image is used as a security pattern, and an image obtained by providing a fluorescent latent image on a transfer object is called a security pattern forming body. As the object to be transferred, those requiring security are preferably used, and examples thereof include various kinds of cards such as passport booklets, ID cards, credit cards, and licenses.

The ultraviolet absorption pattern 33 for forming the fluorescent latent image is formed on the transfer layer 36 of the intermediate transfer medium 30 by
If it is below the fluorescent material layer such as the fluorescent adhesive layer 24,
Since it is located above the fluorescent material layer after transfer to the transfer target, it may be formed on any layer. The ultraviolet absorption pattern can be formed from a material obtained by adding an organic ultraviolet absorber to a resin binder, or a material obtained by reacting with a resin binder.

Examples of the organic ultraviolet absorber include salicylate-based, benzophenone-based, benzotriazole-based, substituted acrylonitrile-based, nickel chelate-based, and hindered amine-based ultraviolet absorbers.

The reactive ultraviolet absorber may be the same as the organic ultraviolet absorber described above, for example, an addition polymerizable double bond such as a vinyl group, an acryloyl group or a methacryloyl group, or an alcoholic hydroxyl group, an amino group, a carboxyl group or an epoxy group. And a resin having an isocyanate group introduced therein are reacted and fixed to a resin binder for use. As a method of reaction fixing, a copolymer is obtained by radical polymerization of a conventionally known monomer, oligomer, or resin component of a reactive polymer and a reactive ultraviolet absorber having an addition-polymerizable double bond as described above. be able to. In addition, when the reactive ultraviolet absorber has a hydroxyl group, an amino group, a carboxyl group, an ethoxy group, and an isocyanate group, use a thermoplastic resin having reactivity with the above-described reactive group, and optionally use a catalyst. The reactive ultraviolet absorber can be reacted and fixed to the thermoplastic resin by heat or the like.

The ultraviolet absorption pattern 33 may be formed by any method such as a printing method or a transfer method using the above-described ink having an ultraviolet absorber, but as shown in FIG. When a visible image is formed using the dye transfer film 20 provided with the ultraviolet absorber layer 25, it is preferable to form the visible image by transfer to an intermediate transfer medium.

The peeling layer 32 of the intermediate transfer medium 30 is peeled off from the base film 31 when transferring to the medium to be transferred, and is located on the outermost surface after the transfer and serves as a protective layer. As the release layer, a material used for a release layer of a known transfer sheet can be used.

The release layer can be formed from a composition containing a binder resin and a release material. As the binder resin, thermoplastic resins such as polymethyl methacrylate, polyethyl methacrylate, acrylic resins such as polybutyl acrylate, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, polyvinyl alcohol, polyvinyl butyral, etc. Vinyl resins, cellulose derivatives such as ethyl cellulose, nitrocellulose, and cellulose acetate, or thermosetting resins such as unsaturated polyester resins, polyester resins, polyurethane resins, and amino alkyd resins can be used. Further, as the releasing material, waxes, silicone wax, silicone resin, melamine resin, fluorine resin, fine powder of talc or silica, surfactant, lubrication of metal soap and the like can be used.

The release layer is prepared by dissolving or dispersing the above resin in an appropriate solvent to prepare a coating liquid, and applying the coating liquid on a substrate film by a gravure printing method, a screen printing method, a reverse coating method using a gravure plate, or the like. It can be formed by applying and drying by the means described above. The thickness of the release layer after drying is usually 0.1 to 5 μm.

In the intermediate transfer medium shown in FIG. 14B, the fluorescent adhesive layer is configured so that the adhesive layer also functions as the fluorescent material layer. However, the fluorescent material layer and the adhesive layer may be formed as separate layers. . For example, as in an intermediate transfer film 30 shown in FIG. 8, a release layer 32, an ultraviolet absorbing pattern 33, a fluorescent material layer 37, and a receiving layer 34 also serving as an adhesive layer are sequentially formed on the surface of the base film 31. Intermediate transfer film receiving layer 3
It is also possible to form an intermediate transfer medium by recording information such as a visible image on the medium 4 and transfer it to the surface of the transfer-receiving body to form a security pattern formed body.

The receiving layer also serving as the adhesive layer is formed from a dye-dyeable resin. Specifically, saturated polyester, polyamide, polyacrylate, polycarbonate,
Polyurethane, polyvinyl acetal, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polystyrene, styrene-acryl copolymer, styrene-butadiene copolymer, vinyl toluene-acryl copolymer, cellulose resin, etc. Is mentioned. These resins may be used alone or in combination of two or more.

As the fluorescent material layer, for example, a material containing a fluorescent agent represented by the formula (1) used for the fluorescent latent image transfer film shown in FIG. 1 or the fluorescent ink layer of the film is preferably used. In addition, materials containing the following phosphors can be used.

The phosphor is a substance that emits luminescence, and includes both an inorganic phosphor and an organic phosphor. As the inorganic phosphor, oxides such as Ca, Ba, Mg, Zn, and Cd, and crystals such as sulfides, silicates, phosphates, and tungstates as main components, and Mn, Zn, Ag, Cu, S
A pigment obtained by adding a metal element such as b or Pb or a rare earth element such as a lanthanoid as an activator and calcining the same can be used.

Preferred phosphors are ZnO: Zn, Br
(PO) Cl: Eu, ZnGeO: Mn, YO: Eu,
Y (P, V) O: Bu, YOSi: Eu, ZnGeO:
Mn and the like can be exemplified. As the organic phosphor, diaminostilbene disulfonic acid derivatives, imidazole derivatives, coumarin derivatives, derivatives such as triazole, carbazole, pyridine, naphthalic acid, imitazolone, dyes such as fluorescein and eosin, and compounds having a benzene ring such as anthracene are used. Can be

In terms of durability and weather resistance, inorganic pigments are excellent. On the other hand, organic pigments have good wettability of the ink vehicle, and thus have excellent suitability for ink formation without any particular surface treatment. Among the above-mentioned pigments, in order to improve durability, weather resistance, especially light resistance or printability, a stable oxide or oxyacid salt-based inorganic phosphor having a relatively large particle size and a large luminance is preferred. preferable. In particular, Z
The use of nO: Zn is excellent in terms of luminance and weather resistance. In addition, a rare earth phosphor can be exemplified as the phosphor.

The phosphor preferably has a pigment particle size adjusted in order to improve the fluorescent characteristics such as luminance and the printing characteristics of the ink. From such a viewpoint, it is preferable to use a phosphor composed of pigment particles having an average particle size of 0.7 to 4 μm, more preferably, an average particle size of 0.7 to 2 μm, and most preferably, 1 to 2 μm. It is desirable to use pigment particles in the range of In general, it is expected that the smaller the particle size of the pigment, the better the ink properties will be. However, when the particle size is less than 0.7 μm, a phenomenon in which the brightness of the fluorescence is significantly reduced is observed. Therefore, 0.7
It is preferable to use a phosphor having a particle size of μm or more. On the other hand, if the particle size exceeds 4 μm, the transparency of the obtained fluorescence image may be reduced.

The content of the phosphor in the entire composition excluding the solvent constituting the fluorescent ink is 15 to 80% by weight in order to improve both luminance and transferability (adhesion) to a printing substrate.
Is more preferable, and a more preferable range is 20 to 50% by weight.
It is appropriate that When the content of the phosphor is less than 15%, depending on the type of the phosphor, the fluorescent luminance in the ink composition state is extremely reduced. For example, when the content is about 12%, the luminance of the pigment itself is about 1/10. May decrease to The thickness of the fluorescent light emission image can be appropriately determined depending on the required fluorescent luminance and the content of the phosphor, and can be, for example, about 1 to 10 μm.
In the present invention, from the viewpoint of ensuring transparency, a phosphor having a relatively small particle size is used as described above.However, the shortage of the fluorescence intensity due to the small particle size is caused by increasing the thickness of the fluorescence emission image. I can make up for it.

Further, the properties (hiding power, coloring power,
It is preferable to perform a surface treatment to improve oil absorption, durability, etc.). In particular, when an inorganic pigment is used, its surface is hydrophilic and has poor affinity with an oily polymer. Therefore, it is preferable to improve the affinity with the polymer by performing a surface treatment. Examples of the method include a method using a coating agent, a coupling agent, a polymerizable monomer, and the like.

The security pattern forming body includes:
As shown in FIGS. 9 and 10, the hologram effect layer 41 is formed on the transfer layer 36, and the surface of the hologram effect layer is finely embossed to form a hologram pattern, and titanium oxide or the like is vapor-deposited on the pattern. Metal thin film layer 4 provided
A hologram consisting of two can be provided. In the embodiment shown in FIG. 9, an ultraviolet absorption pattern 33 and a receiving layer 34 are provided on the hologram pattern. In the embodiment shown in FIG. 10, a fluorescent material layer 37 is provided on the hologram pattern, on the ultraviolet absorption pattern, and a receiving layer is provided thereon. As described above, by using the fluorescent latent image in combination with another security means such as a hologram, a security pattern formed body with higher security can be obtained.

Examples of the base resin of the hologram effect layer 41 include unsaturated polyester resin, acrylic urethane resin, epoxy-modified acrylic resin, epoxy-modified unsaturated polyester resin, alkyd resin, phenol resin and the like. Examples of the thermoplastic resin include acrylate resin, acrylamide resin, nitrocellulose resin, and polystyrene resin. These resins may be used alone or in combination of two or more of various isocyanate resins, metal soaps such as cobalt naphthenate and zinc naphthenate, peroxides such as benzoyl peroxide, methyl ethyl ketone peroxide, benzophenone, acetophenone, anthraquinone, naphthoquinone, and azo. A heat or ultraviolet curing agent such as bisisobutyronitrile and diphenyl sulfide may be blended. As the ionizing radiation-curable resin, epoxy acrylate, urethane acrylate, modified acrylic polyester or the like is used as an oligomer, and a monomer such as neopentyl glycol acrylate or trimethylolpropane triacrylate is used for the purpose of adjusting the crosslinking structure and viscosity. Are appropriately mixed.

The dye transfer film shown in FIGS. 11 to 13 can be used to form an intermediate transfer medium. In these dye transfer films, an ink layer 22 and a release layer 23 of each color are formed in a plane sequence, and a single layer such as an adhesive layer 26, an ultraviolet absorber layer 27, and a fluorescent material layer 25 is formed on the release layer 23. It is configured as a plurality of formed ink ribbons.

[0076]

[Example] [Example 1 of preparation of fluorescent latent image transfer film] Thickness 6
A μm polyethylene terephthalate film (trade name: Lumirror, manufactured by Toray Industries, Inc.) was used as a base film, and a heat-resistant slip layer (back layer) was formed on one surface of the base film by a gravure coating method using a silicone resin to a thickness of 1 μm. On the other side, a coating amount of a coating composition for a fluorescent ink layer having the following composition when dried by a gravure coating method is 0.6 g / m ^2.
And dried to form a fluorescent latent image transfer film. It should be noted that the fluorescent compound No. Is shown in Table 1 above.

[Coating solution 1 for fluorescent ink layer] 5 parts by weight of polyvinyl acetal resin (manufactured by Sekisui Chemical Co., Ltd.) 8 3 parts by weight ・ Methyl ethyl ketone 60 parts by weight ・ Toluene 22 parts by weight ・ Isopropanol 10 parts by weight

[Preparation Example 2 of Fluorescent Latent Image Transfer Film] The fluorescent latent image layer prepared in Preparation Example 1 of the above-described fluorescent latent image transfer film was replaced with a sublimable dye layer of yellow, magenta, cyan and black colors and a fluorescent ink layer. Gravure printing is repeated in such a manner that the panel length of each color (or each layer) becomes 15 cm in the order of a heat transferable resin black layer and a protective layer, and then dried to obtain a four-color dye layer-resin black layer-fluorescent light. A fluorescent latent image transfer film integrated with an ink layer and a protective layer was formed.

[Production Example 3 of Fluorescent Latent Image Transfer Film] In Production Example 2 of the fluorescent latent image transfer film, a fluorescent ink layer was provided in the order following the protective layer panel, and the procedure was the same. As a result, an integrated fluorescent latent image transfer film was obtained.

[Production Example 4 of Fluorescent Latent Image Transfer Film] A fluorescent ink layer and a hologram protective layer-integrated fluorescent material were prepared in the same manner as in Film Production Example 2 except that a hologram pattern was formed on the protective layer in Film Production Example 2. A latent image transfer film was formed.

Example 1 A sublimation-type thermal transfer sheet and a thermal transfer image-receiving sheet described below were superimposed on each other, and thermal energy was applied using a thermal head of a printer that operates according to an electrical signal obtained by color separation of a face photograph to form a full-color image. Formed. Next, the image receiving sheet on which the full-color image is formed and the transfer film of Production Example 1 of the fluorescent latent image transfer film are superimposed, and according to an electric signal obtained from a monochromatic image rich in gradation different from the face photograph. Then, a fluorescent latent image was formed using the thermal head of the printer described above to obtain a print having the fluorescent latent image.

The sublimation type thermal transfer sheet is made of a 6 μm thick polyethylene terephthalate film (manufactured by Toray Industries, Inc .: Lumirror) on one side of a 0.5 μm thick urethane resin.
And a heat-resistant slip layer having a thickness of 1 μm is provided on the multi-side (back side). The following composition of yellow ink, magenta ink and cyan ink is applied on the surface of the primer layer along the flow direction of the polyester film. In this order, gravure printing was repeated repeatedly such that each length became 15 cm, and dried to form a three-color sublimable ink layer, thereby obtaining a sublimation-type thermal transfer sheet. The application amount of each color is
Each was about 3 g / m ² (solid content). Three color inks containing a sublimable dye were prepared as follows.

[Yellow Ink Composition] 3.5 parts by weight of a quinophthalone-based dye represented by the following structural formula: 4.5 parts by weight of polyvinyl butyral (S-Rex BX-1, manufactured by Sekisui Chemical Co., Ltd.) 1/1) 90.0 parts by weight

[0084]

Embedded image [In the formula, n represents a normal system. ]

[Magenta Ink Composition] In the above-described yellow ink, the dye was changed to C.I.
(CIDisperse Red 60)
A magenta ink was obtained.

[Cyan Ink Composition] In the above-described yellow ink, the dye was converted to C-Isolvent Blue 63 (CI
A cyan ink was obtained in the same manner except that Solvent Blue 63) was used.

The thermal transfer image-receiving sheet uses a synthetic paper (Yupo FPG-150, thickness 150 μm, manufactured by Oji Yuka Synthetic Paper) as a base sheet, and coats a coating solution for a dye receiving layer having the following composition on one surface with a bar. 4g coating amount when dried by coater
/ M ^2, and dried to form a dye-receiving layer, thereby preparing a thermal transfer image-receiving sheet.

[Coating solution for dye receiving layer]-Vinyl chloride-vinyl acetate copolymer (Electric vinyl 1000A, manufactured by Denki Kagaku) 20.0 parts by weight-Epoxy-modified silicone oil (X-22-3000T, Shin-Etsu Chemical Co., Ltd.) 1.0 parts by weight ・ Methyl ethyl ketone / toluene (1/1) 80.0 parts by weight

Example 2 A print having a fluorescent latent image was obtained in the same manner as in Example 1 except that a fluorescent latent image was formed before a full-color image was formed.

Example 3 An image was obtained in the same manner as in Example 1 except that a protective layer was formed on the image in Example 1 provided with a full-color image and a fluorescent latent image.

Example 4 On the printed matter provided with the full-color image in Example 1,
A print was obtained in the same manner as in Example 1 except that a protective layer was first formed, and then a fluorescent latent image was provided on the protective layer.

Example 5 Using the four-color dye layer-fluorescent latent image layer-resin black layer-protective layer integrated film of Preparation Example 2 of a fluorescent latent image transfer film, first using three colors of yellow-magenta-cyan. Forming a full-color image according to 1 on a thermal transfer image-receiving sheet;
Next, using a dye black layer, a sign and fingerprint information are printed on an area different from the face photograph full-color image on the thermal transfer image-receiving sheet, and then the electricity obtained from the monocolor image of Example 1 is printed using the fluorescent ink layer. A fluorescent latent image is formed in accordance with the signal, character information such as name, date of birth, address, and bar code are printed using a resin black ink layer, and finally these entire images provided on the thermal transfer image receiving sheet are printed. The protective layer was transferred so as to cover the printed image to obtain a print.

Example 6 In Example 5, instead of providing a protective layer after forming a fluorescent latent image using the integral film of Example 2 of the preparation of a fluorescent latent image transfer film, a method of preparing a fluorescent latent image transfer film 3 was used. Printed matters were obtained in the same manner as in Example 5 except that a fluorescent latent image was formed after a protective layer was provided using a body film.

Example 7 In Example 5, a fluorescent latent image transfer film was prepared in the same manner as in Example 2 except that the integrated film was replaced with a fluorescent latent image transfer film.
In this manner, a printed matter having a hologram pattern formed thereon was obtained in the same manner as in Example 5 except that the protective layer having the hologram pattern formed thereon was transferred using the integrated film of Example 1.

Example 8 Example 5 except that a card was used as the thermal transfer image-receiving sheet.
In the same manner as in the above, a card-shaped print was obtained.

Example 9 A print was obtained in the same manner as in Example 5 except that a passport booklet was used as the thermal transfer image-receiving sheet.

Example 10 Example 5 except that a license was used as the thermal transfer image-receiving sheet.
A print was obtained in the same manner as described above.

For the prints of Examples 1 to 10,
The visibility of the fluorescent latent image was evaluated. Table 2 shows the results. The evaluation method is to irradiate ultraviolet rays having a wavelength of 300 to 400 nm,
Visually observe whether the fluorescent latent image can be clearly recognized,
When the fluorescent coloring was clearly confirmed, it was evaluated as ○, and when the printing pattern of the fluorescent latent image was not confirmed, it was evaluated as x.
As shown in Table 2, in all of Examples 1 to 10, the fluorescent coloring was clearly confirmed.

[0099]

[Table 2]

Intermediate Transfer Medium A release layer (also a protective layer) of 1.5 μm on the surface of a polyethylene terephthalate transparent substrate having a thickness of 12 μm, an ultraviolet absorbent pattern printing was performed by gravure printing, 1.0 μm, and a dye receiving layer of 2.0 μm Was gravure coated to obtain an intermediate transfer medium of the embodiment shown in FIG.

Intermediate Transfer Medium A release layer (also a protective layer) of 1.5 μm and ultraviolet absorption pattern printing were performed by gravure printing on the surface of a 12 μm-thick polyethylene terephthalate transparent substrate, and a 1.0 μm fluorescent material layer was obtained. 0 μm and a dye receiving layer of 2.0 μm were sequentially gravure coated to obtain an intermediate transfer medium of the embodiment shown in FIG.

Intermediate Transfer Medium A release layer (also a protective layer) of 1.5 μm and a hologram effect layer of 2.0 μm were gravure coated on the surface of a 12 μm thick transparent substrate of polyethylene terephthalate. The surface of the hologram effect layer was finely embossed to form a hologram pattern. Next, titanium oxide was vacuum-deposited (500 A) on the surface of the hologram effect layer after embossing.
Further, an ultraviolet absorption pattern printing was performed on the surface, and 1.0 μm
m and a receiving layer of 2.0 μm were gravure coated to obtain an intermediate transfer medium of the embodiment shown in FIG.

Intermediate Transfer Medium A release layer (also a protective layer) of 1.5 μm and a hologram effect layer of 2.0 μm were gravure coated on the surface of a 12 μm thick transparent substrate of polyethylene terephthalate. The surface of the hologram effect layer was finely embossed to form a hologram pattern. Next, titanium oxide was vacuum-deposited (500 angstroms) on the embossed hologram effect layer surface. Further, an ultraviolet absorption pattern printing was performed on the surface, and 1.0 μm, a fluorescent material layer 3.0 μm, and a receiving layer 2.
The intermediate transfer medium of the embodiment shown in FIG. 10 was obtained by gravure coating 0 μm.

The following compositions were used for the peeling layer, hologram effect layer, receiving layer, fluorescent material layer, ultraviolet absorbing layer and adhesive layer of the intermediate transfer medium and the dye transfer film.

[Coating solution for release layer (also protective layer)] (All units are parts by weight hereinafter) Acrylic resin 40 parts Polyester resin 2 parts Methyl ethyl ketone 50 parts Toluene 50 parts

[Hologram effect layer coating liquid] Acrylic resin 40 parts Melamine resin 10 parts Cyclohexanone 50 parts Methyl ethyl ketone 50 parts

[Receptive layer coating liquid] Vinyl chloride-vinyl acetate copolymer 50 parts Acrylic silicone 1.5 parts Methyl ethyl ketone 50 parts Toluene 50 parts

[Ink for fluorescent material] Byron 270 (polyester resin) 30 parts Ubitex OB 1 part Toluene 35 parts Methyl ethyl ketone 35 parts

[Ultraviolet Absorbing Layer Ink 1] 40 parts of copolymer resin reactively bonded with a reactive ultraviolet absorber (UVA-635L manufactured by BASF Japan) 40 parts of zinc antimonate 40 parts of methyl ethyl ketone 30 parts of toluene 30 parts

[Adhesive layer ink] PVC vinyl chloride resin 30 parts Toluene 35 parts Methyl ethyl ketone 35 parts

Dye Transfer Film Each of yellow, magenta, and cyan inks was gravure coated in this order in the flow direction of the PET film (coating amount: 3.0 μm). Further, a release layer was provided on the release layer in succession to the film, and an adhesive layer was provided on the release layer to obtain a dye transfer film.

Dye Transfer Film Each of yellow, magenta, and cyan inks was gravure-coated in this order in the flow direction of the PET film (coating amount: 3.0 μm). Further, a release layer was provided successively on the film, and an adhesive layer ink and a fluorescent material ink were mixed in equal amounts on the release layer to form an adhesive layer / fluorescent material layer, thereby obtaining a dye transfer film.

Dye Transfer Film Each of yellow, magenta, and cyan inks was gravure coated in this order in the flow direction of the PET film (coating amount: 3.0 μm). Further, a release layer is sequentially provided on the release film, and an ultraviolet absorber layer is provided on the release layer, and an adhesive layer ink and a fluorescent material ink are mixed in equal amounts to form an adhesive layer and a fluorescent material layer. Was formed to obtain a dye transfer film.

The following compositions were used for the inks of each color of the dye transfer film. <Yellow ink> Quinophthalone dye represented by the following structural formula [Formula 4] 5.5 parts by weight Polyvinyl butyral 4.5 parts by weight (S-LEC BX-1 manufactured by Sekisui Chemical Co., Ltd.) Methyl ethyl ketone / toluene (1/1) 90. 0 parts by weight

[0115]

Embedded image

<Magenta Ink> In the above-mentioned yellow ink, the dye was changed to C.I.
A magenta ink was obtained in the same manner except that (CI Disperse Red 60) was used.

<Cyan Ink> In the above-described yellow ink, the dye was changed to CI Solvent Blue 63 (C.I.
I. A cyanine tree was obtained in the same manner except that Solvent Blue 63) was used.

Security Pattern Former Using an intermediate transfer medium and a dye transfer film,
As shown in the process diagram, a sublimation dye image is formed on the receiving layer of the intermediate transfer medium and the fluorescent material layer / adhesive layer (fluorescent adhesive layer) is solid-transferred, and then the adhesive layer is transferred and re-transferred to a passport booklet. Thus, a security pattern formed body was obtained.

Security Pattern Forming Using the intermediate transfer medium and the dye transfer film,
As shown in the process diagram, a sublimation dye image is formed on the receiving layer of the intermediate transfer medium, the ultraviolet absorbing layer is pattern-transferred with a thermal head, the fluorescent material layer and the adhesive layer are transferred with a solid pattern, and then re-transferred to a passport booklet. Thus, a security pattern formed body was obtained.

Using the intermediate transfer medium and the dye film, a sublimation dye image is formed on the receiving layer of the intermediate transfer medium as shown in the process diagram of FIG. A patterned product was obtained.

Security Pattern Forming Using the intermediate transfer medium and the dye film, a sublimation dye image was formed on the receiving layer of the intermediate transfer medium as shown in the process diagram of FIG. 17, and the fluorescent material layer / adhesive layer was transferred in a solid pattern. Thereafter, the adhesive layer was transferred and retransferred to a passport booklet to obtain a security pattern formed body.

Security Pattern Forming Using the intermediate transfer medium and the dye film, a sublimation dye image is formed on the receiving layer of the intermediate transfer medium as shown in the process diagram of FIG. After the solid pattern transfer of the fluorescent material layer and the adhesive layer, the security pattern formed body was obtained by re-transferring to a passport booklet.

Using the intermediate transfer medium and the dye film, a sublimation dye image is formed on the receiving layer of the intermediate transfer medium as shown in the process diagram of FIG. A patterned product was obtained.

Comparative Example A release layer (also a protective layer) of 1.5 μm was formed on the surface of a transparent substrate of polyethylene terephthalate having a thickness of 12 μm, and a fluorescent coloring pattern was formed by gravure printing to 1.0 μm.
0 μm was gravure coated.

Comparative Example A release layer (also a protective layer) of 1.5 μm was formed on the surface of a transparent substrate of polyethylene terephthalate having a thickness of 12 μm, a fluorescent coloring pattern was formed by gravure printing, and a dye receiving layer was formed.
0 μm was gravure coated.

Comparative Example A release layer (also a protective layer) of 1.5 μm was formed on the surface of a transparent substrate of polyethylene terephthalate having a thickness of 12 μm, and a fluorescent color pattern was formed by gravure printing with the following ink composition to obtain a color of 1.0 μm.
m, and a dye receiving layer of 2.0 μm was gravure coated.

The following inks were used for printing the fluorescent coloring patterns of Comparative Examples 1 to 3. [Fluorescent ink] Byron 270 (polyester resin) 30 parts Ubitex OB 10 parts Toluene 35 parts Methyl ethyl ketone 35 parts

[0128]

[Table 3]

Visibility: Visibility of the fluorescent latent image by visual observation (○:
Easy to see ×: hard to see) Information variability: variability of fluorescent latent image pattern (○: variable ×: not variable) Concealment: possibility of visual confirmation under normal light source (white light, sunlight) (○: Invisible in normal state ×: Fluorescent latent image pattern is visible even in normal state) Reproducibility: Print reproducibility of fine pattern (○: Good reproduction ×: Poor reproduction) (Eg: Good preservability ×: Poor preservability)

In the present invention, any combination of the intermediate transfer medium, the dye film and the ultraviolet absorbing pattern and the fluorescent material layer may be used as long as the film can be formed simultaneously.

[0131]

As described above, the method for transferring a fluorescent latent image according to the present invention employs a method of transferring using a fluorescent latent image transfer film having a fluorescent ink layer using a specific fluorescent agent. Tone fluorescent latent image can be formed satisfactorily. This fluorescent latent image is not visible with visible light, but can be clearly seen when irradiated with ultraviolet light. Therefore, the printed matter of the present invention can confirm that the printed matter is genuine by using the fluorescent latent image, so that forgery or falsification of the printed matter by copying or the like can be prevented well. The fluorescent ink composed of a resin binder containing the above specific fluorescent compound has excellent transferability and gradation of a fluorescent latent image.

Further, in the security pattern forming body of the present invention, sufficient coloring luminance of the fluorescent latent image pattern can be obtained, and the fluorescent latent image can be easily identified without adversely affecting the raw material during processing.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a main part showing an example of a fluorescent latent image transfer film.

FIG. 2 is a vertical sectional view of a main part showing another example of a fluorescent latent image transfer film.

FIGS. 3A to 3H are plan views showing aspects of a fluorescent latent image transfer film.

FIGS. 4A to 4I are plan views showing aspects of a fluorescent latent image transfer film.

FIG. 5 is a cross-sectional view showing an embodiment of the print of the present invention.

FIG. 6 is a cross-sectional view showing an embodiment of the print of the present invention.

FIG. 7 is a cross-sectional view illustrating an embodiment of an intermediate transfer medium.

FIG. 8 is a cross-sectional view illustrating an embodiment of an intermediate transfer medium.

FIG. 9 is a cross-sectional view illustrating an embodiment of an intermediate transfer medium.

FIG. 10 is a cross-sectional view illustrating an embodiment of an intermediate transfer medium.

FIG. 11 is a sectional view showing an embodiment of a dye transfer film.

FIG. 12 is a cross-sectional view illustrating an embodiment of a dye transfer film.

FIG. 13 is a cross-sectional view showing an embodiment of a dye transfer film.

FIG. 14 is a process chart showing a security pattern forming method.

FIG. 15 is a process chart showing a security pattern forming method.

FIG. 16 is a process chart showing a security pattern forming method.

FIG. 17 is a process chart showing a security pattern forming method.

FIG. 18 is a process chart showing a security pattern forming method.

FIG. 19 is a process chart showing a security pattern forming method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fluorescent latent image transfer film 2 Heat resistant base film 3 Fluorescent ink layer 4 Back layer 5 Thermal sublimation dye layer 6 Heat fusible ink layer 7 Protective layer 9 Printed matter 10 Printed matter 11 Fluorescent latent image 12, 13, 14 Visible Image 20 Dye transfer film 21 Base film 22 Dye ink layer 23 Release layer 24 Fluorescent adhesive layer 25 Fluorescent material layer 26 Adhesive layer 27 UV absorbing layer 30 Intermediate transfer medium 31 Base film 32 Release layer 33 UV absorbing pattern 34 Receiving layer Reference Signs List 35 visible image 36 transfer layer 37 fluorescent material layer 38 adhesive layer 40 fluorescent latent image transfer film 41 hologram effect layer 42 metal thin film layer 50 transferred object 51 security pattern formed body

Claims (17)

[Claims] 1. A fluorescent latent image transfer film in which a fluorescent ink layer formed from a resin binder containing a fluorescent agent represented by the formula (1) is provided on a heat-resistant base film, and the fluorescent latent image transfer film is superposed on a transfer object. Heating to an arbitrary pattern by a heating element from the heat-resistant base film side of the fluorescent latent image transfer film, transferring the fluorescent ink layer of the fluorescent latent image transfer film according to the pattern of the heating element to a transfer target, A method of transferring a fluorescent latent image, comprising forming a fluorescent latent image comprising a fluorescent agent on a transfer target. Embedded image 2. The method for transferring a fluorescent latent image according to claim 1, wherein a fluorescent latent image is formed after forming an image with visible ink on the surface of the transfer object. 3. The method according to claim 1, wherein an image is formed using a visible ink after forming the fluorescent latent image on the surface of the transfer object. 4. The method for transferring a fluorescent latent image according to claim 1, wherein the fluorescent latent image is formed during the formation of an image using visible ink on the surface of the transfer object. 5. A protective layer is formed on the outermost surface.
The method for transferring a fluorescent latent image according to any one of the above items. 6. The method according to claim 2, wherein a protective layer is formed after forming an image with the visible ink, and a fluorescent latent image is formed on the surface of the protective layer. 7. One or more layers selected from a thermosublimable dye layer, a heat-meltable black ink layer and a protective layer of at least one of yellow, magenta, cyan and black colors, and a fluorescent ink layer. The image according to any one of claims 1 to 6, wherein an image formed by a visible ink, a protective layer, and a fluorescent latent image are continuously formed using a fluorescent ink layer integrated film provided on the same transfer surface in a sequential manner. Fluorescent latent image transfer method. 8. The method according to claim 5, wherein a hologram pattern is formed on the protective layer. 9. The method according to claim 1, wherein the transfer target is a card. 10. The transfer object is a passport.
9. The method for transferring a fluorescent latent image according to any one of items 1 to 8. 11. The transfer object is a license.
The method for transferring a fluorescent latent image according to any one of the above items. 12. A print, wherein a fluorescent latent image is formed by the fluorescent latent image transfer method according to claim 1. Description: 13. In a printed matter provided with a security pattern based on a fluorescent latent image and a receiving layer on which information is recorded, at least on the surface of the transfer-receiving body, the security pattern is formed between the fluorescent material layer and the fluorescent material layer. It is composed of an ultraviolet absorption pattern provided in a pattern shape, using an intermediate transfer medium in which the receiving layer, the ultraviolet absorption pattern and the fluorescent material layer are formed as a transfer layer,
A security pattern forming body provided by transferring a transfer layer of an intermediate transfer medium onto a surface of an object to be transferred. 14. An ultraviolet absorbing pattern using an ultraviolet absorbing agent transfer film provided with an ultraviolet absorbing agent layer,
14. The security pattern formed body according to claim 13, wherein the transfer film is formed by heating the transfer film to an arbitrary pattern by a heating element and transferring an ultraviolet absorbent layer corresponding to the pattern of the heating element. 15. The security pattern formed body according to claim 13, wherein the fluorescent material layer is formed using a fluorescent latent image transfer film having a fluorescent ink layer made of a resin binder containing a fluorescent agent. 16. An intermediate transfer medium in which a transfer layer having a receiving layer in which a fluorescent latent image composed of an ultraviolet absorption pattern and a fluorescent material layer and information are recorded is provided on a base film,
A method of forming a security pattern by transferring a transfer layer of the intermediate transfer medium to a transfer target, wherein the intermediate transfer medium is such that an ultraviolet absorption pattern in a transfer layer after transfer is located above a fluorescent ink layer. A security pattern forming method comprising a fluorescent latent image formed thereon. 17. A dye transfer film, wherein a fluorescent material is contained in the adhesive layer in a thermal transfer medium in which a dye layer and an adhesive layer are provided on a surface of a base film in a plane-sequential manner.