JPH01310381A - Forming method for original - Google Patents

Abstract

PURPOSE:To prevent forgery of a formed image by accomplishing chromic compound applied to base paper, which becomes different color from its surface color by ultraviolet rays and transparent by visible beams or heat. CONSTITUTION:A coating 2 made of chromic compound which is obtained by adding, for instance, 75wt% oxazine and 20wt% acrylate resin to 100wt% acetone is applied on a wood free paper 1 containing white titanium. Then, an image is formed as the original on the plane on the side of the coating 2 with normal white toner 3 containing titanium oxide. When the original is irradiated with ultraviolet rays to turn a non-image part blue, the image part with the white toner 3 can be distinguished. If the original is copied by a usual copying machine, oxazine in the coating 2 turns into transparent by the visible beam 5 from a light source or the heat 6, and the discrimination between the white toner 3 and white color of the wood free paper. Therefore, forgery of a formed image can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for creating an original, and more particularly, to a method for creating and covering an original that can prevent theft of information.

[Prior Art 1] In recent years, with the spread of copying machines and the like, various types of information can be transmitted quickly and easily. On the other hand, for example,
Original documents such as simple readings and secret documents in a company can easily be forged by other companies using a copying machine, and the information can easily be stolen.

Conventionally, as a method of creating an original document that can prevent forgery, for example, a method using special base paper is known. This special base paper has a surface structure in which two layers of aluminum vapor deposition and a special pigment overlap, and various information is formed as an image on this surface by printing etc., and it is used as the original document. The original document obtained in this way absorbs or reflects diffusely the light from the light source even if it is copied using a normal copying machine using black paper, for example.
It is designed so that only an all-black copy can be obtained.

[Problem to be solved by the invention 1 However, in the original document created by the conventional method,
For example, by varying the exposure amount of a light source of a copying machine, it is possible to suppress diffused reflection and the like and transfer an original image onto copy paper.

This is not sufficient to prevent forgery of original documents, and it becomes possible for information to be stolen.

Furthermore, when this original document is left for a long period of time, the contrast between image and non-image areas changes, resulting in a lack of printing durability, such as difficulty in reading the original. Furthermore, the conventional manufacturing method has the problem that the process is complicated.

The present invention has been made with attention to the above-mentioned problems, and it reliably prevents the forgery of formed images, furthermore prevents theft of information, and also allows original documents with excellent print durability to be produced. The purpose is to provide a method that allows easy creation.

[Means for Solving the Problems] The method for producing an original of the present invention involves forming a base paper on which a color develops in a color different from the surface color of the base paper when exposed to ultraviolet rays, and then fades to a transparent color when exposed to visible light or heat. A first step of applying a paint mainly containing an Omic compound to form paper, and a second step of forming an image on the surface of the paper on the paint side with a toner of the same color as the surface color of the base paper. It is characterized by consisting of 16 items.

[Function] The first step is to create paper by applying a paint mainly containing a chromic compound onto base paper.

The second step is to form an image using a toner on the paint side of the paper that was printed in the first step, and use it as an original.

Here, the chromic compound is ultraviolet light (wavelength: 3.8x
10-7~1xlO11m), it develops a color different from the surface color of the base paper, and visible light (wavelength near, 8X10''~
3.8x10-7rn) or heat to fade to a lighter color.

Therefore, when the raw wood produced by the production method of the present invention receives ultraviolet rays, the chromic compound develops color, and the mink compound removes the image area formed with toner of the same color as the surface color of the base paper. It has a contrast with the colored non-image area. However, it is possible to read the image at this time.

Conversely, when the original receives visible light or receives a certain amount of heat, the chromic compound is decolored, and the chromic compound is separated from the image @ area formed with toner of the same color as the surface color of the base paper. It has no contrast with the bleached non-1iIiii image parts. That is, at this time, it is impossible to decipher the image. Also, when this raw wood is copied using, for example, a normal copying machine, even if the exposure layer of the light source is changed, the light source will still shine! l) Visible light and heat caused by 1'1 cause image and non-image areas to lose contrast, making it impossible to transfer the image to a copy.

In this way, the original created by the creation method of the present invention reliably prevents forgery and information theft.

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

The method for creating the original in this example consists of the first step of applying a paint mainly containing chromic compounds onto the base paper to make paper, and the paint side surface of the paper that has been painted 1q with this first culm. ni gutter
and a second step of forming an image.

First, the first step is performed. The base paper here is a normal high-quality paper 1 containing titanium white, as shown in cross section in FIG. The surface color of this high quality 11t1 is white C.

In addition, chromic compounds include oquinazine (C4HsNO
). This oxazine exhibits irreversible color development and embellishment at temperatures below 50°C, and is highly thermally stable.

Note that an acrylic resin was used as a dispersant for dispersing and binding this oxazine. Moreover, aretone was used as a solvent.

Add 75 parts by weight of these oxazine and 20 parts by weight of acrylic resin to 100 parts by weight of acetone, stir and dissolve.
And so.

Then, this paint 2 was applied to the above-mentioned top 1 paper 1 at 60q/m21 using a specified []-ru coater, and dried at 80°C using a hot air dryer to form A-4 size paper. . A cross section of this paper is shown in FIG.

Next, a second step was performed. Here, the toner is a normal white toner 3 containing titanium oxide as a pigment.

And electronic copy P! Copy machine (manufactured by Minolta Camera, E P
-8702), an image was formed with white toner 3 on the surface of the two types of paint on the paper, and the image was used as an original. A cross section of this original is shown in Figure 1.

The original thus prepared was irradiated with an ultraviolet lamp, turning the non-image areas blue. The image portion is white.

Figure 4 (a) shows a cross section of this original document when it receives ultraviolet 4
). At this time, A xazine in paint 2 is exposed to ultraviolet 4
The color is blue (symbol 28 in the figure), and the white image portion formed with the white toner 3 and the blue non-image portion have a contrast. Therefore, this image can be read and the like. This original document was left indoors at room temperature for 3 days and then turned blue when irradiated with ultraviolet light.

Furthermore, the contrast of the colored portion did not change much compared to before being left at room temperature, making it easy to read and having excellent printing durability.

This original was then copied using a regular black toner copier. However, no image was transferred to the copy. The same result was obtained even when the fog light I4r of the light source was changed. This is the fourth cross-section of the raw wood that has been passed through a copy machine.
As shown in Figure (b), the oxazine in the paint 2 fades to a transparent color due to the visible light 5 and heat 6 emitted from the light source and becomes 33.
(symbol 2b in the figure), white toner 3 is -F51 paper 1
Since it is white, which is the same color as the surface color, the white image portion and the white non-image portion do not have contrast.

The original, illuminated by a light source from a copying machine, was impossible to read.

As described above, the image of the log made by the method of this embodiment can be read when ultraviolet rays are received, but the image cannot be transferred by a copying machine. Therefore, in this embodiment, it is possible to reliably prevent forgery of formed images, thereby preventing information theft, and to easily create originals with excellent printing durability.

In addition, in the examples, the present invention was embodied using the above-mentioned materials, but the following materials etc. can also be used.

The base paper includes, but is not limited to, art paper,
Cellulose-based white paper such as kraft paper, a plastic sheet containing milky white pigment, etc. may also be used.

Furthermore, the surface colors of the four papers are not limited.

The following compounds can be used, for example. For reference, the chemical formulas of some of the compounds shown before and after the change are shown.

(1) Spiropyran and analogues (ionic dissociation) The chemical formulas of these compounds are shown in Figures 5-9.

(2) Cis-trans isomer thioindigo and the compound shown in Figures 10 to 14 (3)
Tautomeric ketoenol isomers with hydrogen transfer, aci-nitro isomers and first
Compounds J shown in Figures 5 to 21 (4) Photostance ring reactants cis-dilbene, fulgide and compounds shown in Figures 22 to 25 (5) Heterocycle-containing valence isomerization reactants Nidrone-oxazirindine system, 1-phenoxy Anthraquinones (6) Photodiminor reactants (7> Photooxygen addition reactants to aromatic polycyclic compounds) (8) Photoredox reactants Thiazine dye systems, viologens, and the compounds shown in Figures 26 and 27. In the compound diagrams shown in Figures 26 and 27, R is Furkyl group, ea is methyl group, X and Yl
A phosphoric acid group, pH is a phenyl group, and n is a natural number.

These chromic compounds preferably develop a color that is complementary to the color of the base paper and toner, and are preferably highly thermally stable.

Further, the dispersant is usually substantially transparent to visible light, which is used in paints, inks, etc., and is not limited to any known thermoplastic resin or thermosetting resin. For example, saturated polyester resin, polyamide resin, acrylic resin, ethylene to vinyl acetate copolymer, ionic 'JNMAA reflexine copolymer (ionomer), styrene-butadiene block copolymer, polyarylate, polycarbonate, vinyl chloride-vinyl acetate. Thermal i5J plastic resins such as copolymers, cellulose esters, polyimides, and styrene resins, and thermosetting resins such as epoxy resins, urethane resins, silicone resins, phenolic resins, melamine resins, xylene resins, alkyd resins, and thermosetting acrylic resins. etc. can be used. These variances N1
can be used alone or in combination, and further in combination with a suitable solvent.

The combination of chromic compound J3, dispersant, and solvent may be determined depending on the purpose of use and conditions of use.

Then, the adjusted paint can be applied, for example, by dip coating method, spray coating method, spinner coating method, etc.
Coating and drying may be performed by a coating method such as a blade coating method, a roller coating method, a wire bar coating method, etc., and the coating may be applied onto a No. 11 paper.

Further, the toner may be of the same color as the surface color of the base paper, and is not limited to white toner. That is, for example, if the surface color of the base paper is black, a black toner can be used.

Furthermore, the means for forming an image using the toner in the second step is not limited to a copying machine, but may also be a known printing method.

[Effects of the Invention] As described above, according to the method for creating an original of the present invention, il! ! The chromic compound applied develops a color different from the surface color of the base paper when exposed to ultraviolet rays, and fades to a transparent color when exposed to visible light or heat, which reliably prevents forgery of the formed image and, in turn, prevents theft of information. You can create an original document.

Furthermore, the method for creating an original according to the present invention can easily create an original with excellent printing durability.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional view of an original document created according to an embodiment of the present invention. FIG. 2, FIG. 3, FIG. 4(a) and FIG. 4(b) are all explanatory diagrams of the steps and effects. Moreover, all of FIGS. 5 to 27 are chemical formulas of exemplary chromic compounds. 1...Base paper 2.2a, 2b...Paint 3
...Toner 4...Ultraviolet light 5...Visible light 6...Heat

Claims (1)

[Claims] (1) A paint mainly composed of a chromic compound that develops a color different from the surface color of the base paper when exposed to ultraviolet rays and disappears to a transparent color when exposed to visible light or heat is applied onto the base paper to form paper.
and a second step of forming an image on the surface of the paper on the paint side with toner of the same color as the surface color of the base paper.