JPH06219036A - Image forming body - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an image forming body that is difficult to reproduce by a color copier or the like. [Structure] A linear first pattern 1 composed of a colored ink containing one (eg, an imino compound) of a two-component thermosensitive chemical that causes an irreversible chemical reaction by heating to develop color, and the other thermosensitive chemistry Second linear pattern 2 composed of a different color ink containing a substance (for example, an isocyanate compound) and having a different hue from that of the color ink
And a third pattern 3 formed on a portion where these patterns overlap with each other and formed on a support by a colored ink or a different color ink and a heating color body having a different hue. Then, the third pattern is an extremely complicated and fine pattern, and since each pattern is continuous without being cut off from each other with respect to the third pattern, and the hues are different from each other, the duplication is performed by a color copying machine or the like. Even if an attempt is made, it is difficult to mechanically match the registration accuracy in the continuous portion of each pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming body having a plurality of color patterns on an appropriate support such as paper, and more particularly to improvement of an image forming body which is difficult to reproduce by a color copying machine or the like. Is.

[0002]

2. Description of the Related Art Conventionally, in order to prevent counterfeiting or forgery of securities such as stock certificates, bonds, checks, passbooks, lottery tickets, bills, etc., a complicated color with a hand engraved plate at any place on a support such as paper Preventive measures are taken such as applying a pattern or MCF fine print, or forming a transparent pattern.

[0003]

However, in recent years, with the spread of color copiers and the like, there have been many cases in which the stocks, bonds, checks, passbooks, lottery tickets and other securities and banknotes have been duplicated and abused. is doing.

In particular, since the functions of recent color copying machines have been remarkably improved, it becomes difficult to distinguish between a copy made by the copying machine and a real bill, etc. with the naked eye. There is a social demand for a new anti-counterfeiting means that can prevent the duplication of such information.

The present invention has been made by paying attention to such problems, and an object thereof is to provide an image forming body which is extremely difficult to reproduce by a color copying machine or the like.

[0006]

That is, the invention according to claim 1 is premised on an image forming body having a color pattern on a support, and a two-component type heat-sensitive material which develops color by causing an irreversible chemical reaction by heating. A linear first pattern composed of a colored ink containing one of the chemical substances and a linear second pattern composed of a different color ink containing the other thermosensitive chemical substance and having a hue different from that of the colored ink. The pattern is formed at a portion where the first pattern and the second pattern are overlapped with each other, and the color ink and the different color ink are different from each other in hue and are composed of a color-developing body generated by an irreversible chemical reaction of each thermosensitive chemical substance. Third pattern,
Is provided on the above support.

According to the image forming member of the present invention, the linear first pattern composed of the colored ink containing one thermosensitive chemical substance and the other thermosensitive chemical substance are contained. The third pattern formed in a portion where the colored second ink and the linear second pattern composed of the different color ink having different hues overlap each other becomes an extremely complicated and fine pattern, and the first pattern and the second pattern. In the above-mentioned portion where is overlapped with each other, the first pattern, the second pattern and the third pattern are continuous without being cut off from each other around this portion, and the hues of the respective patterns are also different from each other.

Therefore, even if an attempt is made to reproduce the color pattern composed of the first pattern, the second pattern and the third pattern by using the above-mentioned color copying machine or a conventional color printing machine based on photoengraving. Since the registration accuracy in the continuous portion of each pattern cannot be handled properly, it is possible to reliably prevent the duplication.

In particular, when the line widths of the first pattern and the second pattern are small, the third pattern formed in the portion where these patterns overlap becomes a very fine pattern, and the effect is great. The invention according to claim 2 is made for such a technical reason.

That is, the invention according to claim 2 is claim 1
On the premise of the image forming body according to (1), the line width of the first pattern and the second pattern is set to 1 mm or less.

Next, the inventions according to claims 3 to 5 relate to the invention in which the above-mentioned thermosensitive chemical substances applicable to this technical means are specified.

Before testing the thermosensitive chemicals described below, the present inventor conducted an experiment of cross-point coloring using a first ink containing dimethylglyoxime and a second ink containing a nickel ion-based material. Is going. However, in these reaction systems of dimethylglyoxime and nickel ion-based substances that cause an irreversible chemical reaction just by bringing them into contact with each other, when unreacted chemicals bleed over time, the intersection area expands and the coloring area also expands. Therefore, it has already been confirmed that the initial print pattern changes and it is difficult to put it into practical use.

The invention according to claims 3 to 5 will be described below.

First, the invention according to claim 3 is based on the image forming body according to claim 1, wherein one of the thermosensitive chemical substances is composed of an imino compound and the other thermosensitive chemical substance is composed of an isocyanate compound. It is characterized by being present.

Here, the imino compound has the general formula

[Chemical 1] (Φ is an aromatic compound residue capable of forming a conjugated system with adjacent C = N), and is a colorless or light-colored compound that is solid at room temperature.

Specific examples will be given below, but depending on the purpose, 2
You may use together 1 or more types of imino compounds. That is, 3
-Iminoisoindoline-1-one, 3-imino-4,
5,6,7-tetrachloroisoindoline-1-one,
3-imino-4,5,6,7-tetrabromoisoindoline-1-one, 3-imino-4,5,6,7-tetrafluoroisoindoline-1-one, 3-imino-5
6-dichloroisoindoline-1-one, 3-imino-
4,5,7-Trichloro-6-methoxy-isoindoline-1-one, 3-imino-4,5,7-trichloro-
6-methylmercapto-isoindoline-1-one, 3
-Imino-6-nitroisoindoline-1-one, 3-
Imino-isoindoline-1-spiro-dioxolane,
1,1-dimethoxy-3-imino-isoindoline,
1,1-diethoxy-3-imino-4,5,6,7-tetrachloroisoindoline, 1-ethoxy-3-imino-isoindoline, 1,3-diiminoisoindoline,
1,3-Diimino-4,5,6,7-tetrachloroisoindoline, 1,3-Diimino-6-methoxyisoindoline, 1,3-Diimino-6-cyanoisoindoline, 1,3-Diimino-4 , 7-dithia-5, 5, 6,
6-tetrahydroisoindoline, 7-amino-2,3
-Dimethyl-5-oxopyrrolo [3,4b] pyrazine,
7-amino-2,3-diphenyl-5-oxopyrrolo [3,4b] pyrazine, 1-iminonaphthalimide,
1-iminodiphenic acid imide, 1-phenylimino-3
-Iminoisoindoline, 1- (3'-chlorophenylimino) -3-iminoisoindoline, 1- (2 ',
5'-dichlorophenylimino) -3-iminoisoindoline, 1- (2 ', 4'5'-trichlorophenylimino) -3-iminoisoindoline, 1- (2'-cyano-4'-nitrophenylimino) -3-iminoisoindoline, 1- (2'-chloro-5'-cyanophenylimino) -3-iminoisoindoline, 1- (2 ', 6'-
Dichloro-4'-nitrophenylimino) -3-iminoisoindoline, 1- (2 ', 5'-dimethoxyphenylimino) -3-iminoisoindoline, 1- (2',
5'-diethoxyphenylimino) -3-iminoisoindoline, 1- (2'-methyl-4'-nitrophenylimino) -3-iminoisoindoline, 1- (5'-chloro-2'-phenoxyphenyl Imino) -3-iminoisoindoline, 1- (4′-N, N-dimethylaminophenylimino) -3-iminoisoindoline, 1-
(3'-N, N-dimethylamino-4'-methoxyphenylimino) -3-iminoisoindoline, 1- (2 '
-Methoxy-5'-N-phenylcarbamoylphenylimino) -3-iminoisoindoline, 1- (2'-chloro-5'-trifluoromethylphenylimino) -3
-Iminoisoindoline, 1- (5 ', 6'-dichlorobenzothiazolyl-2'-imino) -3-iminoisoindoline, 1- (6'-methylbenzothiazolyl-2'
-Imino) -3-iminoisoindoline, 1- (4'-
Phenylaminophenylimino) -3-iminoisoindoline, 1- (p-phenylazophenylimino) -3
-Iminoisoindoline, 1- (naphthyl-1'-imino) -3-iminoisoindoline, 1- (anthraquinone-1'-imino) -3-iminoisoindoline, 1-
(5'-chloroanthraquinone-1'-imino) -3-
Iminoisoindoline, 1- (N-ethylcarbazolyl-3′-imino) -3-iminoisoindoline, 1-
(Naphthoquinone-1'-imino) -3-iminoisoindoline, 1- (pyridyl-4'-imino) -3-iminoisoindoline, 1- (benzimidazolone-6'-imino) -3-iminoisoindoline , 1- (1'-methylbenzimidazolone-6'-imino) -3-iminoisoindoline, 1- (7'-chlorobenzimidazolone-5'-imino) -3-iminoisoindoline, 1-
(Benzimidazolyl-2'-imino) -3-iminoisoindoline, 1- (benzimidazolyl-2'-imino) -3-imino-4,5,6,7-tetrachloroisoindoline, 1- (2 ' , 4'-Dinitrophenylhydrazone) -3-iminoisoindoline, 1- (indazolyl-3'-imino) -3-iminoisoindoline, 1
-(Indazolyl-3'-imino) -3-imino-4,
5,6,7-Tetrabromoisoindoline, 1- (indazolyl-3'-imino) -3-imino-4,5,6,6
7-tetrafluoroisoindoline, 1- (benzimidazolyl-2′-imino) -3-imino-4,7-dithiatetrahydroisoindoline, 1- (4′-5′-dicyanoimidazolyl-2′-imino) -3-imino-
5,6-dimethyl-4,7-pyradiisoindoline, 1
-(Cyanobenzoylmethylene) -3-iminoisoindoline, 1- (cyanocarbonamidomethylene) -3-
Iminoisoindoline, 1- (cyanocarboxylic methoxymethylene) -3-iminoisoindoline, 1- (cyanocarboxylic ethoxymethylene) -3-iminoisoindoline, 1- (cyano-N-phenylcarbamoylmethylene) -3-iminoiso Indoline, 1- [cyano-N-
(3'-Methylphenyl) -carbamoylmethylene]-
3-iminoisoindoline, 1- [cyano-N- (4 '
-Chlorophenyl) -carbamoylmethylene] -3-iminoisoindoline, 1- [cyano-N- (4'-methoxyphenyl) -carbamoylmethylene] -3-iminoisoindoline, 1- [cyano-N- (3'- Chloro-
4'-Methylphenyl) -carbamoylmethylene] -3
-Iminoisoindoline, 1- (cyano-p-nitrophenylmethylene) -3-iminoisoindoline, 1-
(Dicyanomethylene) -3-iminoisoindoline, 1
-[Cyano-1 ', 2', 4'-triazolyl-
(3 ′)-Carboxamidomethylene] -3-iminoisoindoline, 1- [cyanothiazoyl- (2 ′)-carbonamidomethylene] -3-iminoisoindoline, 1
-[Cyanobenzimidazolyl- (2 ')-carboxamidomethylene] -3-iminoisoindoline, 1- [cyanobenzothiazolyl- (2')-carbonamidomethylene] -3-iminoisoindoline, 1- [ (Cyanobenzimidazolyl-2 ′)-methylene] -3-iminoisoindoline, 1-[(cyanobenzimidazolyl-
2 ')-Methylene] -3-imino-4,5,6,7-tetrachloroisoindoline, 1-[(cyanobenzimidazolyl-2')-methylene] -3-imino-5-methoxyisoindoline, 1 -[(Cyanobenzimidazolyl-2 ')-methylene] -3-imino-6-chloroisoindoline, 1-[(1'-phenyl-3'-methyl-
5-oxo) -pyrazolidene-4 ']-3-iminoisoindoline, 1-[(cyanobenzimidazolyl-
2 ')-Methylene] -3-imino-4,7-dithiatetrahydroisoisoindoline, 1-[(cyanobenzimidazolyl-2')-methylene] -3-imino-5,6
-Dimethyl-4,7-pyradiisoindoline, 1-
[(1'-Methyl-3'-n-butyl) -palpituric acid-5 ']-3-iminoisoindoline, 3-imino-1
-Sulfobenzoic acid imide, 3-imino-1-sulfo-6
-Chlorobenzoic acid imide, 3-imino-1-sulfo-
5,6-dichlorobenzoic acid imide, 3-imino-1-sulfo-4,5,6,7-tetrachlorobenzoic acid imide,
3-imino-1-sulfo-4,5,6,7-tetrabromobenzoic acid imide, 3-imino-1-sulfo-4,5,5
6,7-Tetrafluorobenzoic acid imide, 3-imino-
1-sulfo-6-nitrobenzoic acid imide, 3-imino-
1-sulfo-6-methoxybenzoic acid imide, 3-imino-1-sulfo-4,5,7-trichloro-6-methylmercaptobenzoic acid imide, 3-imino-1-sulfonaphthoic acid imide, 3-imino-1 -Sulfo-5-bromonaphthoic acid imide, 3-imino-2-methyl-4,5,
6,7-tetrachloroisoindoline-1-one and the like can be mentioned.

On the other hand, the isocyanate compound applied to the invention according to claim 3 is a colorless or light-colored aromatic isocyanate or heterocyclic isocyanate which is solid at room temperature, and for example, one or more of the following can be applied. That is,
2,6-dichlorophenyl isocyanate, p-chlorophenyl isocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, 1,
3-dimethylbenzene-4,6-diisocyanate,
1,4-Dimethylbenzene-2,5-diisocyanate, 1-methoxybenzene-2,4-diisocyanate, 1-methoxybenzene-2,5-diisocyanate, 1-ethoxybenzene-2,4- Diisocyanate, 2,5-dimethoxybenzene-1,4-diisocyanate, 2,5-diethoxybenzene-1,4-diisocyanate, 2,5-dibutoxybenzene-1,4-diisocyanate , Azobenzene-4,4'-diisocyanate, diphenyl ether-4,4'-diisocyanate, naphthalene-1,4-diisocyanate, naphthalene-1,5-diisocyanate, naphthalene-2,6
-Diisocyanate, naphthalene-2,7-diisocyanate, 3,3'-dimethyl-biphenyl-4,4'-
Diisocyanate, 3,3'-dimethoxybiphenyl-
4,4'-diisocyanate, diphenylmethane-4,
4'-diisocyanate, diphenyldimethylmethane-
4,4'-diisocyanate, benzophenone-3,
3'-diisocyanate, fluorene-2,7-diisocyanate, anthraquinone-2,6-diisocyanate, 9-ethylcarbazole-3,6-diisocyanate, pyrene-3,8-diisocyanate , Naphthalene-
1,3,7-triisocyanate, biphenyl-2,
4,4'-triisocyanate, p-dimethylaminophenyl isocyanate, tris (4-phenylisocyanate) thiophosphate and the like can be mentioned. These isocyanate compounds, if necessary, phenols,
It may be used in the form of a so-called block isocyanate which is an addition compound with lactams, oximes and the like, and a dimer of diisocyanate, for example, 1-methylbenzene-2,4-diisocyanato dimer. , And isocyanurate which is a trimer, or may be used as a polyisocyanate adducted with various polyols.

By the heat treatment, the imino compound and the isocyanate compound cause an irreversible chemical reaction as shown in the following reaction formula to form a chromophore.

[0019]

[Chemical 2] During this heat-coloring treatment, the isocyanate compound which is not in contact with the imino compound is likely to cause thermal decomposition, and therefore, even if the imino compound in the pattern causes bleeding thereafter, it remains between the decomposed isocyanate compound and No heat-colored body is produced at the temperature, and therefore the initial image pattern does not change with time.

When the imino compound and the isocyanate compound are colorless, it is necessary to form a colored ink and a different color ink by appropriately adding a coloring material such as a dye or a pigment. Incidentally, even when the imino compound and the isocyanate compound are colored, it is optional to add a coloring material to adjust to another hue.

Next, the invention according to claim 4 is based on the image forming body according to claim 1, wherein one of the thermosensitive chemical substances is composed of a leuco dye and the other thermosensitive chemical substance is composed of a developer thereof. It is characterized by being configured.

The leuco dye applicable to the present invention is a blue coloring system.

[Chemical 3] From red to orange

[Chemical 4] Green color system

[Chemical 5] Black color

[Chemical 6] Etc.

On the other hand, as a color developer which forms an irreversible chemical reaction by heating with these leuco dyes to form a color developing material,

[Chemical 7] Etc.

By irradiating the surface of the image-formed body on which each pattern has been formed with light such as ultraviolet rays after the heating and coloring treatment, unreacted leuco dyes and / or unreacted leuco dyes contained in the first pattern and the second pattern are formed. Since the color developer is easily inactivated, even if the leuco dye and / or the color developer causes bleeding thereafter, a heated color body does not occur. Therefore, the initial image as in the invention according to claim 3 is obtained. The pattern does not change over time.

When the above-mentioned color developer is colorless, it is necessary to form a colored ink or a different color ink by appropriately blending a coloring material as in the invention according to claim 3. Also,
A colored ink or a different color ink having a color different from the hue of the leuco dye may be formed by mixing a coloring material having a different color from the leuco dye.

On the other hand, the invention according to claim 5 is premised on the image forming body according to claim 1, wherein one of the thermosensitive chemical substances is constituted by a diazonium salt and the other thermosensitive chemical substance is constituted by the coupler thereof. It is characterized by being present.

The diazonium salt applicable to the present invention is

[Chemical 8] Further, as a coupler for forming an irreversible chemical reaction by heating with a diazonium salt to form a chromophore, a blue-purple color-developing coupler can be used.

[Chemical 9] Red color

[Chemical 10] Yellow to orange

[Chemical 11] Black color

[Chemical 12] Etc.

As in the case of the invention according to claim 4, the surface of the image forming body on which each pattern is formed is irradiated with light such as ultraviolet rays after the heating and coloring treatment, whereby the first pattern or the second pattern is formed. Since the unreacted diazonium salt contained therein is likely to be inactivated by causing a photodecomposition reaction, even if a coupler or the like bleeds thereafter, a heated color body does not occur, and therefore, according to claims 3 and 4. Similar to the invention, the initial image pattern does not change with time.

When the diazonium salt is colorless, it is necessary to form a colored ink or a different color ink by appropriately blending a coloring material as in the invention according to claim 3. The coupler may be mixed with a coloring material having a different color to form a colored ink or a different color ink having a color different from the hue of the coupler.

Here, in these image forming bodies according to claims 1 to 5, a linear first pattern composed of colored ink containing one thermosensitive chemical substance and the other thermosensitive chemical substance are provided. A linear second pattern composed of a different color ink having a different hue from that of the colored ink, including the colored ink and the different color ink and the hue thereof formed at the portion where the first pattern and the second pattern overlap. It suffices to have at least a third pattern composed of a different heat coloring material, and a plurality of first pattern groups composed of two or more kinds of colored inks and two or more kinds of different color inks. A plurality of second pattern groups, and a plurality of first pattern group and the second pattern group of the third pattern composed of a heating color body formed in the respective overlapping portion of the form Good course also of things.

A specific example of the invention according to claim 4 will be described below. Two or more kinds of colored inks (those having different hues) containing different kinds of leuco dyes are prepared, and these inks are used. A plurality of kinds of first pattern groups are formed and a second pattern is formed by one kind of different color ink containing a color developer, or a colorant and a color developer each having a different hue are contained. A second pattern group is formed from different types of different color inks, and a third pattern composed of a heat-coloring body is formed in a portion where each pattern group overlaps. These first pattern group, second pattern group, and third pattern An image forming body having a complicated pattern may be formed by using.

Instead of using a plurality of leuco dyes, two or more kinds of color inks (those having different hues) may be formed by using a plurality of coloring materials to be mixed with the color ink. . Further, these forming methods can be applied as they are to the thermosensitive chemical substances used in the inventions according to claims 3 and 5.

Here, in addition to the above-mentioned stocks, bonds, checks, passbooks, lottery tickets, boarding tickets, coupons, commuter passes, etc., the image forming bodies according to claims 1 to 5 are applicable. Various identification documents such as passports and driver's licenses, plastic cards such as ID cards, credit cards, cash cards, gift cards, and securities-related products that can be replaced with cash vouchers such as prepaid cards typified by telephone cards.

[0034]

According to the first aspect of the present invention, a linear first pattern composed of a colored ink containing one of the two-component thermosensitive chemical substances that develop an irreversible chemical reaction by heating to develop a color, A linear second pattern made of a different color ink containing one thermosensitive chemical substance and having a hue different from that of the colored ink, and the colored ink formed at a portion where the first pattern and the second pattern overlap. In addition, a third pattern, which has a different hue from that of the different color ink and which is composed of a color former generated by an irreversible chemical reaction of each thermosensitive chemical substance, is provided on the support.

The third pattern formed in the portion where the linear first pattern and the second pattern overlap is a very complicated and fine pattern, and in the above-mentioned portion where the first pattern and the second pattern overlap. Since the first pattern, the second pattern, and the third pattern are continuous without being cut off from each other around this portion, and the hue of each pattern is different from each other, the first pattern, Even if an attempt is made to reproduce a color pattern composed of two patterns and a third pattern by a color copying machine or a conventional color printing machine based on photoengraving, the registration accuracy in the continuous portion of each pattern corresponds mechanically. Since it can not be cut off, it is possible to reliably prevent its duplication.

Further, according to the invention of claim 2, the line width of the first pattern and the second pattern is set to 1 mm or less, so that the third pattern formed in the portion where these patterns overlap is more It becomes a complicated and fine pattern, and it becomes possible to more reliably prevent the above duplication.

On the other hand, according to the invention of claim 3, one of the thermosensitive chemical substances is composed of an imino compound and the other thermosensitive chemical substance is composed of an isocyanate compound.

During the heat-coloring treatment of the portion where the first pattern and the second pattern overlap, the isocyanate compound which is not in contact with the imino compound is likely to cause thermal decomposition, and thereafter the imino compound in the pattern causes bleeding. Even if it occurs, the above-mentioned heat-colored body is rarely formed with the isocyanate compound after decomposition, so that the initial image pattern does not change with time.

According to the invention of claim 4, one of the thermosensitive chemical substances is constituted by a leuco dye and the other thermosensitive chemical substance is constituted by the developer.

After the area where the first pattern and the second pattern overlap each other is heated and color-developed, the surface of the image forming body on which each pattern is formed is irradiated with light such as ultraviolet rays so that the first pattern and the second pattern are formed. Since the unreacted leuco dye and / or color developer contained in the pattern is easily inactivated, a heated color body does not occur even if the leuco dye and / or color developer bleeds thereafter, Similar to the invention of Item 3, the initial image pattern does not change with time.

According to the invention of claim 5, one of the thermosensitive chemical substances is constituted by a diazonium salt and the other thermosensitive chemical substance is constituted by the coupler thereof.

Then, after the area where the first pattern and the second pattern overlap each other is heated and colored, the surface of the image forming body on which each pattern is formed is irradiated with light such as ultraviolet rays, so that the first pattern and the second pattern are formed. The unreacted diazonium salt contained in the pattern is liable to be inactivated by causing a photolysis reaction, so that even if the coupler or the like bleeds thereafter, a heat-colored body does not occur, and thus, the coloring matter does not occur. Similar to the invention described above, the initial image pattern does not change with time.

[0043]

EXAMPLES Examples of the present invention will be described in detail below.

Example 1 First, a colored ink and a different color ink having the following compositions were prepared.

(Colored Ink) 3-Amino-1-imino-4,5,6,7-tetrachloro-1H-isoindole (A-100 manufactured by Asahi Kasei) 25 g Binder resin (SS16B medium manufactured by Toyo Ink Manufacturing) 50 g Yellow colorant (SS16-221 yellow manufactured by Toyo Ink Mfg. Co., Ltd.) 2 g Solvent (S-787 solvent manufactured by Toyo Ink Mfg. Co., Ltd.) 10 g Curing agent (SSUR100B additive manufactured by Toyo Ink Mfg. Co., Ltd.) 5 g First, the above "SS16B medium" 50 g To "A-1
00 ”25 g,“ S-787 solvent ”10 g,“ SS16
-221 yellow ”2 g was dispersed and kneaded, and immediately before printing,“ S
5 g of SUR100B additive ”was added to prepare a colored ink.

(Different color ink) 4,4 ′, 4 ″ -triisocyanate-2,5-dimethoxytriphenylamine (B-500 manufactured by Asahi Kasei Corporation) 25 g SS16B medium 50 g Red colorant (SS16- manufactured by Toyo Ink Mfg. Co., Ltd.) 161 Red) 2 g S-787 solvent 10 g SSUR100B additive 5 g Similarly, "SS16B medium" 50 g, "B-50
0 "25g," S-787 solvent "10g," SS16- "
161 Beni ”2 g was dispersed and kneaded, and“ SS
UR100B additive ”(5 g) was added to prepare a different color ink.

Then, a character pattern (first pattern) 1 having a line width of 1 mm as shown in FIG. 1 (A) is formed on the coated paper 10 by screen printing using the colored ink, and the different color ink is applied. By using the same printing method, a fine print pattern (second pattern) 2 having a line width of 100 μm was printed.

After drying, 2 in an oven at 120 ° C
When heat treatment was performed for 0 seconds, only the portion where the first pattern 1 and the second pattern 2 overlapped with each other turned brown-red and the third pattern 3 was formed as shown in FIG. 1 (B).

Then, when an attempt was made to reproduce the image forming body on which the first pattern 1, the second pattern 2 and the third pattern 3 were formed by a color copying machine, the misregistration of the patterns in the areas where the respective patterns were adjacent to each other. Was observed, and thus it was easily confirmed by the naked eye that it was a duplicate thereof.

Bleeds such as "A-100" and "B-500" in the first pattern and the second pattern did not occur, so that the temporal change of the image pattern was not confirmed.

Example 2 As a leuco dye, tris (p
-Aminophenyl) fluorene was applied, and "SS16B
25 g of this leuco dye and 50 g of "SS-
10 g of "787 solvent" and 2 g of "SS16-221 yellow" were dispersed and kneaded, and 5 g of "SSUR100B additive" was added immediately before printing to prepare a colored ink.

On the other hand, bisphenol A was applied as a developer, and as in the above, 50 g of "SS16B medium", 25 g of this bisphenol A and "S-787 solvent" 10
g, 2 g of "SS16-161 Beni" was dispersed and kneaded, and
Immediately before printing, 5 g of "SSUR100B additive" was added to prepare a different color ink.

Then, a pattern similar to that of Example 1 was screen-printed, dried and then subjected to heat treatment in an oven at 130 ° C. for 30 seconds. As in Example 1, the first pattern and the second pattern overlap each other. Only the part that was changed to black and the third pattern was formed. This image-formed body was also difficult to reproduce by a color copying machine, and bleeding of leuco dye or bisphenol A from each pattern did not occur.

[Example 3] "SS16B medium" 50
g, a red-colored leuco dye (RED5 manufactured by Yamada Chemical Industry Co., Ltd.
20) 20 g, "SS-787 solvent" 10 g, "SS1
6-791 grass "2 g was dispersed and kneaded, and immediately before printing, 5 g of" SSUR100B additive "was added to prepare a first colored ink.

Similarly, "SS16B medium" 5
0 g of green color leuco dye (AT manufactured by Yamada Chemical Co., Ltd.
P) 15 g, "SS-787 solvent" 10 g, "SS16
-221 yellow ”2 g was dispersed and kneaded, and immediately before printing,“ S
5 g of SUR100B additive ”was added to prepare a second colored ink.

On the other hand, as a developer, "TG manufactured by Nippon Kayaku Co., Ltd.
-SA "is applied and" SS16B medium "is applied as above.
28 g of this "TG-SA", 10 g of "S-787 solvent", and 2 g of "SS16-161 Beni" were dispersed and kneaded into 50 g, and 5 g of "SSUR100B additive" was added immediately before printing.
Was added to prepare a different color ink.

Then, two kinds of first pattern groups were formed by screen printing using the first colored ink and the second colored ink, and the second pattern was similarly formed using different color inks. 2, a slightly more complicated pattern was formed.

After drying, the mixture was placed in an oven at 130 ° C. for 3 minutes.
When the heat treatment was performed for 0 seconds, only the portion where the first pattern group and the second pattern were overlapped was colored red or green, and the third pattern was formed. It is extremely difficult to duplicate this image-formed body by a color copying machine, and bleeding of the leuco dye or the developer from each pattern did not occur.

Example 4 Nitrobenzenediazonium tetraboron fluoride was applied as the diazonium salt,
20 g of this diazonium salt, 10 g of "SS-787 solvent", and "SS16-2" to 50 g of "SS16B medium"
21 yellow ”2 g was dispersed and kneaded, and immediately before printing,“ SSU
Colored ink was prepared by adding 5 g of "R100B additive".

On the other hand, by applying phloroglyside as a coupler, as in the above, 50 g of "SS16B medium", 20 g of this phloroglyside, 10 g of "S-787 solvent",
2 g of "SS16-161 Beni" was dispersed and kneaded, and 5 g of "SSUR100B additive" was added immediately before printing to prepare a different color ink.

Then, the same pattern as in Example 1 was screen-printed, dried and then heat-treated in an oven at 130 ° C. for 30 seconds. As in Example 1, the first pattern and the second pattern were overlapped. Only the part that was changed to black and the third pattern was formed. Incidentally, this image-formed body was also difficult to be duplicated by a color copying machine, and the bleeding of diazonium salt or coupler from each pattern did not occur.

[0062]

According to the first aspect of the present invention, the third pattern formed at the portion where the linear first pattern and the second pattern overlap each other becomes an extremely complicated and fine pattern,
And, in the above-mentioned region where the first pattern and the second pattern overlap, these first pattern, the second pattern and the third pattern are continuous without cutting each other around this region, and the hue of each pattern is also Since they are different from each other, even if an attempt is made to reproduce the color pattern composed of the first pattern, the second pattern and the third pattern by a color copying machine or a conventional color printing machine based on photoengraving. Since the registration accuracy in the continuous portion of each pattern cannot be mechanically matched, there is an effect that the duplication can be surely prevented.

Further, according to the invention of claim 2, the line widths of the first pattern and the second pattern are set to 1 mm or less, so that the third pattern formed in the portion where these patterns overlap is more It has a complex and fine pattern, and has an effect of more reliably preventing the above duplication.

On the other hand, according to the invention of claim 3, one of the thermosensitive chemical substances is composed of an imino compound and the other thermosensitive chemical substance is composed of an isocyanate compound.

During the heat-coloring treatment of the portion where the first pattern and the second pattern overlap, the isocyanate compound which is not in contact with the imino compound easily causes thermal decomposition, and thereafter the imino compound in the pattern causes bleeding. Even if it occurs, the heat-colored body is rarely formed with the isocyanate compound after decomposition, so that it has an effect of retaining the initial image pattern for a long period of time.

According to the invention of claim 4, one of the thermosensitive chemical substances is composed of a leuco dye, and the other thermosensitive chemical substance is composed of the developer thereof. According to such an invention, one of the thermosensitive chemical substances is constituted by a diazonium salt and the other thermosensitive chemical substance is constituted by the coupler thereof.

The invention according to claim 4 is characterized in that after the portion where the first pattern and the second pattern overlap is heated and colored, the surface of the image forming body on which each pattern is formed is irradiated with light such as ultraviolet rays. In, since unreacted leuco dye and / or color developer contained in the first pattern and the second pattern are easily inactivated, even if the leuco dye and / or color developer bleed thereafter, color development by heating On the other hand, in the invention according to claim 5, the unreacted diazonium salt contained in the first pattern and the second pattern easily causes a photolysis reaction and is inactivated. Even if the coupler or the like causes bleeding, a heated color body does not occur.

Therefore, similarly to the third aspect of the invention, there is an effect that the initial image pattern can be held for a long time.

[Brief description of drawings]

FIG. 1A is a plan view of an image forming body according to a first embodiment, and FIG. 1B is a partially enlarged view of FIG.

[Explanation of symbols]

 1 1st pattern 2 2nd pattern 3 3rd pattern

Claims (5)

[Claims] 1. An image-forming body having a color pattern on a support, comprising a linear ink composed of a colored ink containing one of two-component thermosensitive chemical substances which develop an irreversible chemical reaction by heating to develop a color. A first pattern, a linear second pattern composed of another color ink containing the other thermosensitive chemical substance and having a hue different from that of the colored ink, and a portion where the first pattern and the second pattern overlap each other. A third pattern formed on the support, which has a different hue from the colored ink and the different color ink and which is formed by an irreversible chemical reaction of each heat-sensitive chemical substance; Image forming body. 2. The line width of the first pattern and the second pattern is set to 1 mm or less.
The image forming body described. 3. The image forming body according to claim 1, wherein one of the thermosensitive chemical substances is composed of an imino compound, and the other thermosensitive chemical substance is composed of an isocyanate compound. 4. The image forming body according to claim 1, wherein one of the thermosensitive chemical substances is composed of a leuco dye, and the other thermosensitive chemical substance is composed of a developer thereof. 5. The image forming body according to claim 1, wherein one of the thermosensitive chemical substances is constituted by a diazonium salt and the other thermosensitive chemical substance is constituted by the coupler thereof.