JP2842124B2 - Image forming body - Google Patents

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 a suitable support such as paper, and more particularly to an improvement of an image forming body which is difficult to be copied by a color copying machine or the like. It is.

[0002]

2. Description of the Related Art Conventionally, securities such as stock certificates, bonds, checks, passbooks, lotteries, and banknotes, etc., are protected from forgery and counterfeiting. Prevention measures such as applying a pattern, MCF fine print, or forming a see-through pattern are taken.

[0003]

However, in recent years, with the spread of color copiers and the like, there have been many cases in which securities such as the above-mentioned stocks, bonds, checks, passbooks, lotteries, etc. and banknotes are duplicated and abused. doing.

In particular, the functions of recent color copiers have been remarkably improved, and it has become difficult to distinguish between a copy reproduced by a copier and genuine banknotes with the naked eye. There is a social demand for new counterfeiting prevention means capable of preventing such duplication beforehand.

The present invention has been made in view of such a problem, and an object thereof is to provide an image forming body which is extremely difficult to be copied by a color copying machine or the like.

[0006]

That is, the invention according to claim 1 is based on the premise that an image forming body having a color pattern on a support is used, and a two-component heat-sensitive material which develops an irreversible chemical reaction by heating to develop a color. 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 heat-sensitive chemical substance and having a different hue from the colored ink. The pattern, the first pattern and the second pattern are formed at a portion where they overlap with each other, and are formed by the colored ink and the different color ink and a color former having a different hue and produced by an irreversible chemical reaction of each thermosensitive chemical substance. Third pattern,
Is provided on the support.

According to the first aspect of the present invention, there is provided an image forming body comprising: a first linear pattern formed of a colored ink containing one thermosensitive chemical substance; The third pattern formed in the portion where the colored ink and the linear second pattern composed of the different color inks having different hues overlap is an extremely complicated and fine pattern, and the first pattern and the second pattern The first pattern, the second pattern, and the third pattern are continuous with each other without being cut off from the above-mentioned portion where the pattern overlaps, and the hue of each pattern is also different from each other.

Therefore, even if the color pattern constituted by the first pattern, the second pattern and the third pattern is reproduced by the above-mentioned color copying machine or a conventional color printing machine based on photolithography, it is difficult to reproduce the same. Since the registration accuracy in the continuous portion of each pattern cannot be corresponded, it is possible to surely prevent the duplication.

In particular, when the line width of the first pattern and the second pattern is small, the effect of the third pattern formed in a portion where these patterns overlap is extremely fine because the pattern is extremely fine. The invention according to claim 2 has been made for such a technical reason.

That is, the invention according to claim 2 is based on claim 1.
And 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 which specifies the thermosensitive chemical substance applicable to this technical means.

Before testing the thermosensitive chemicals described below, the present inventor conducted an experiment of intersection coloring using a first ink containing dimethylglyoxime and a second ink containing a nickel ion-based substance. Is going. However, in the reaction system of dimethylglyoxime and nickel ion-based substances, which cause an irreversible chemical reaction just by contact, if the unreacted chemical bleeds 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 constituted by an imino compound and the other thermosensitive chemical substance is constituted by an isocyanate compound. It is characterized by having.

Here, the imino compound is represented by the general formula

Embedded image (Φ is a residue of an aromatic compound capable of forming a conjugated system with adjacent CＣN) and is a colorless or pale-colored solid that is solid at room temperature.

Hereinafter, specific examples will be shown, but depending on the purpose, 2
Two or more imino compounds may be used in combination. 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-isoindolin-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-iminodiphenimide, 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,
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- (cyanocarboxymethoxymethylene) -3-iminoisoindoline, 1- (cyanocarboxyethoxymethylene) -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 ′)-carbonamidomethylene] -3-iminoisoindoline, 1- [cyanothiazoyl- (2 ′)-carbonamidomethylene] -3-iminoisoindoline, 1
-[Cyanobenzimidazolyl- (2 ')-carbonamidomethylene] -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, -[(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
-Sulfobenzoimide, 3-imino-1-sulfo-6
-Chlorobenzoic imide, 3-imino-1-sulfo-
5,6-dichlorobenzoic imide, 3-imino-1-sulfo-4,5,6,7-tetrachlorobenzoic imide,
3-imino-1-sulfo-4,5,6,7-tetrabromobenzoic imide, 3-imino-1-sulfo-4,5,
6,7-tetrafluorobenzoic imide, 3-imino-
1-sulfo-6-nitrobenzoic acid imide, 3-imino-
1-sulfo-6-methoxybenzoic imide, 3-imino-1-sulfo-4,5,7-trichloro-6-methylmercaptobenzoic imide, 3-imino-1-sulfonaphthoic imide, 3-imino-1 -Sulfo-5-bromonaphthoic imide, 3-imino-2-methyl-4,5,
6,7-tetrachloroisoindoline-1-one and the like.

On the other hand, the isocyanate compound applied to the invention according to claim 3 is a colorless or pale-colored aromatic isocyanate or heterocyclic isocyanate which is a 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, diphenylether-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-2,2
4,4′-triisocyanate, p-dimethylaminophenyl isocyanate, tris (4-phenyl isocyanate) thiophosphate and the like can be mentioned. These isocyanate compounds may optionally contain 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-diisocyanatono dimer And a trimer, isocyanurate, or a polyisocyanate adducted with various polyols.

The heat treatment causes the above imino compound and the isocyanate compound to cause an irreversible chemical reaction as shown in the following reaction formula to produce a color forming body.

[0019]

Embedded image In addition, during this heat color development treatment, the isocyanate compound that is not in contact with the imino compound is liable to cause thermal decomposition. Therefore, even if the imino compound in the pattern causes bleeding after that, there is a gap between the isocyanate compound after decomposition and the isocyanate compound. Does not produce a heated coloring material, so that the initial image pattern does not change with time.

When the imino compound and the isocyanate compound are colorless, it is necessary to appropriately mix a coloring material such as a dye or a pigment to form the color ink and the different color ink. It should be noted that, even when the imino compound and the isocyanate compound are colored, it is optional to add a coloring material to adjust the color 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 constituted by a leuco dye, and the other thermosensitive chemical substance is constituted by its developer. It is characterized by comprising.

The leuco dye applicable to the present invention is a blue-colored leuco dye.

Embedded image Red to orange

Embedded image Green color

Embedded image Black coloring

Embedded image And the like.

On the other hand, as a developer which causes an irreversible chemical reaction with these leuco dyes by heating to form a color-forming body,

Embedded image And the like.

By irradiating the surface of the image forming body on which each pattern is formed with light such as ultraviolet rays after the heat coloring process, the unreacted leuco dye and / or unreacted dye contained in the first pattern and the second pattern is exposed. Since the color developer is easily deactivated, even if the leuco dye and / or the color developer subsequently bleeds, no heat-colored body is formed. Therefore, the initial image is formed in the same manner as in the invention according to claim 3. The pattern does not change over time.

When the color developer is colorless, it is necessary to form a colored ink or a different color ink by appropriately blending a coloring material in the same manner as in the third aspect of the present invention. Also,
A coloring material having a different color from the leuco dye may be mixed with the leuco dye to form a color ink or a different color ink having a color different from the hue of the leuco dye.

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

The diazonium salts applicable to the present invention include:

Embedded image And the like, and couplers which form an irreversible chemical reaction upon heating with a diazonium salt to form a color forming body include blue to purple colored

Embedded image Reddish

Embedded image Yellow to orange

Embedded image Black

Embedded image And the like.

Further, similarly to the invention according to the fourth aspect, 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, so that the first pattern or the second pattern is formed. Since the unreacted diazonium salt contained therein is liable to be deactivated by causing a photodecomposition reaction, even if the coupler or the like causes bleeding thereafter, no heated color-forming body is produced. As in the invention, the initial image pattern does not change with time.

When the diazonium salt is colorless, it is necessary to form a color ink or a different color ink by appropriately blending a coloring material in the same manner as in the third aspect of the present invention. Further, for the coupler, a coloring material having a different color from the above may be mixed to form a color ink or a different color ink having a color different from the hue of the coupler.

Here, in the image forming body according to any one of the first to fifth aspects, a linear first pattern composed of a colored ink containing one of the thermosensitive chemicals and the other thermosensitive chemical is provided. A linear second pattern composed of the colored ink and a different color ink having a different hue, and the color ink and the different color ink and the hue formed at a portion where the first pattern and the second pattern overlap with each other. What is necessary is just to have at least the 3rd pattern comprised by different heating coloring bodies, and it is comprised by the several 1st pattern group comprised by two or more types of colored ink, and two or more types of different color inks A plurality of second pattern groups, and a form including a third pattern constituted by a heated coloring body formed at a portion where each of the plurality of first pattern groups and the second pattern group overlap each other. Good course also of things.

Hereinafter, specific examples of the invention according to claim 4 will be described. Two or more types of colored inks (having different hues) containing different types of leuco dyes are prepared, and these inks are used. A plurality of first pattern groups are formed, and a second pattern is formed with one type of different color ink containing a color developer, or a color material and a color developer each having a different hue are contained. A second pattern group is formed by different kinds of different color inks, and a third pattern composed of a heated coloring material is formed at a portion where each pattern group overlaps, and these first pattern group, second pattern group, and third pattern are formed. Thus, an image forming body having a complicated pattern form may be formed.

It should be noted that, instead of using a plurality of leuco dyes, two or more types of colored inks (having different hues) may be constituted by using a plurality of coloring materials to be mixed with the colored ink. . Further, these forming methods can be directly applied to the thermosensitive chemical substance used in the inventions according to the third and fifth aspects.

The objects to which the image forming bodies according to the first to fifth aspects are applied include, in addition to the above-mentioned stocks, bonds, checks, passbooks, lotteries, tickets, coupons, commuter passes, etc. For example, various identification cards such as passports and driver's licenses, plastic cards such as ID cards, credit cards, cash cards, gift cards, etc., and securities related products such as prepaid cards such as telephone cards can be exemplified.

[0034]

According to the first aspect of the present invention, a linear first pattern composed of a colored ink containing one of two-component heat-sensitive chemical substances that generates an irreversible chemical reaction upon heating, A linear second pattern containing one of the heat-sensitive chemical substances and composed of the color ink and a different color ink having a different hue, and a color ink formed at a portion where the first pattern and the second pattern overlap with each other; And a third pattern having a different color and a hue different from each other, and a color pattern formed by an irreversible chemical reaction of each thermosensitive chemical substance, on the support.

The third pattern formed at the portion where the linear first pattern and the second pattern overlap is an extremely complicated and fine pattern, and at the portion where the first pattern and the second pattern overlap each other. Since the first pattern, the second pattern, and the third pattern are continuous without being cut off from each other around this part, and the hues of each pattern are also different from each other, the first pattern, the second pattern, and the Even if the color pattern composed of the two patterns and the third pattern is reproduced by a color copying machine or a conventional color printing machine based on photoengraving, the registration accuracy in the continuous part of each pattern is mechanically corresponded. Since the data cannot be copied, the duplication can be surely prevented.

According to the second aspect of the present invention, since the line width of the first pattern and the second pattern is set to 1 mm or less, the third pattern formed at a portion where these patterns overlap is more likely to be formed. The pattern becomes complicated and fine, and the above-mentioned duplication can be more reliably prevented.

On the other hand, according to the third aspect of the present invention, one of the thermosensitive chemical substances is constituted by an imino compound, and the other thermosensitive chemical substance is constituted by an isocyanate compound.

Then, during the heating and 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 liable to cause thermal decomposition, after which the imino compound in the pattern causes bleeding. Even if it occurs, the above-mentioned heated color former is rarely formed with the isocyanate compound after decomposition, so that the initial image pattern does not change with time.

According to the fourth aspect of the invention, one of the thermosensitive chemicals is constituted by a leuco dye, and the other thermosensitive chemical is constituted by a color developer.

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 has been formed is irradiated with light such as ultraviolet rays to thereby form the first pattern and the second pattern. Since the unreacted leuco dye and / or color developer contained in the pattern is easily deactivated, even if the leuco dye and / or color developer subsequently bleeds, a heated color-forming body is not generated. As in the invention according to item 3, the initial image pattern does not change with time.

According to the fifth aspect of the present invention, one of the thermosensitive chemicals is constituted by a diazonium salt, and the other thermosensitive chemical is constituted by a coupler thereof.

Then, 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 to thereby form the first pattern and the second pattern. The unreacted diazonium salt contained in the pattern is liable to be deactivated by inducing a photodecomposition reaction, so that even if the coupler or the like causes bleeding thereafter, a heated coloring material is not generated. Similar to the invention, the initial image pattern does not change with time.

[0043]

Embodiments of the present invention will be described below in detail.

Example 1 First, a color 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 Corporation) 25 g binder resin (SS16B medium manufactured by Toyo Ink Mfg. Co., Ltd.) 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, 50 g of the above-mentioned "SS16B Medium""A-1
00 ”25 g,“ S-787 solvent ”10 g,“ SS16
-221 yellow ”2 g was dispersed and kneaded, and“ S
5 g of "SUR100B additive" was added to prepare a colored ink.

(A Different Color Ink) 4,4 ′, 4 ″ -Triisocyanate-2,5-dimethoxytriphenylamine (B-500, manufactured by Asahi Kasei Co., Ltd.) 25 g SS16B Medium 50 g Red coloring material (SS16-, manufactured by Toyo Ink Manufacturing Co., Ltd.) 161 crimson) 2 g S-787 solvent 10 g SUR100B additive 5 g Similarly, 50 g of “SS16B medium” is added to “B-50”.
0 ”25 g,“ S-787 solvent ”10 g,“ SS16-
161 crimson ”2g is dispersed and kneaded, and“ SS ”
5 g of UR100B additive 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. 1A is formed on the coated paper 10 by screen printing using the above colored ink, and Using the same printing method, a fine print pattern (second pattern) 2 having a line width of 100 μm was printed.

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

When an attempt was made to duplicate the image formed body on which the first pattern 1, the second pattern 2, and the third pattern 3 were formed by a color copying machine, the pattern was misregistered in an area where each pattern was adjacent. Was observed, and thus it was easily confirmed by naked eyes that it was a duplicate thereof.

No bleeding such as "A-100" or "B-500" occurred in the first and second patterns, and no change over time in the image pattern was observed.

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

On the other hand, bisphenol A was applied as a color developer, and 25 g of this bisphenol A and 10 g of “S-787 solvent” were added to 50 g of “SS16B medium” as described above.
g, disperse and knead 2 g of "SS16-161 red", and
Immediately before printing, 5 g of "SSUR100B additive" was added to prepare a different color ink.

Then, the same pattern as in Example 1 was screen-printed, dried, and then subjected to a heating treatment in an oven at 130 ° C. for 30 seconds. As in Example 1, the first pattern and the second pattern overlapped. Only the part which changed color changed to black, and the third pattern was formed. This image formed body was also difficult to copy by a color copier, and no bleeding of leuco dye or bisphenol A from each pattern occurred.

[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 "was dispersed and kneaded, and 5 g of" SUR100B additive "was added immediately before printing to prepare a first colored ink.

Similarly, “SS16B medium” 5
0 g of green-colored leuco dye (AT manufactured by Yamada Chemical Industry Co., Ltd.)
P) 15 g, “SS-787 solvent” 10 g, “SS16
-221 yellow ”2 g was dispersed and kneaded, and“ 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 ”and apply“ SS16B Medium ”as described above.
To 50 g, 28 g of this "TG-SA", 10 g of "S-787 solvent", and 2 g of "SS16-161 red" are dispersed and kneaded, and 5 g of "SSUR100B additive" 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 color ink and the second color ink, and the second pattern was similarly formed using different color inks. 2, a slightly more complicated pattern was formed.

After drying, in an oven at 130 ° C. for 3 hours.
When the heat treatment was performed for 0 seconds, only the portion where the first pattern group and the second pattern overlapped developed a red or green color to form a third pattern. It was extremely difficult to copy this image formed body using a color copier, and no bleeding of leuco dye or developer from each pattern occurred.

Example 4 Nitrobenzenediazonium tetraboron fluoride was used as a diazonium salt.
To 50 g of "SS16B medium", 20 g of this diazonium salt, 10 g of "SS-787 solvent", and "SS16-2"
2 g of “21 Yellow” are dispersed and kneaded, and “SSU” immediately before printing.
R100B additive "(5 g) was added to prepare a colored ink.

On the other hand, phloroglyside was applied as a coupler, and as described above, 20 g of this phloroglyside, 10 g of “S-787 solvent” were added to 50 g of “SS16B medium”, and
2 g of "SS16-161 Red" 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 subjected to a heat treatment in an oven at 130 ° C. for 30 seconds. As in Example 1, the first pattern and the second pattern overlapped. Only the part which changed color changed to black, and the third pattern was formed. Incidentally, this image formed body was also difficult to copy by a color copying machine, and no bleeding of the diazonium salt or coupler from each pattern occurred.

[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 is an extremely complicated and fine pattern,
And, in the above-mentioned part where the first pattern and the second pattern overlap, the first pattern, the second pattern, and the third pattern are continuous without being cut off from each other around this part, and further, the hue of each pattern is also Because they are different from each other, even if the color pattern composed of the first pattern, the second pattern, and the third pattern is reproduced by a color copying machine or a conventional color printing machine based on photoengraving, etc. In addition, since the register accuracy in the continuous portion of each pattern cannot be mechanically corresponded, the duplication thereof can be surely prevented.

According to the second aspect of the present invention, the line width of the first pattern and the second pattern is set to 1 mm or less. It becomes a complicated and fine pattern, and has an effect that the duplication can be more reliably prevented.

On the other hand, according to the third aspect of the present invention, one of the thermosensitive chemicals is constituted by an imino compound and the other thermosensitive chemical is constituted by an isocyanate compound.

In the heating and coloring process at the portion where the first pattern and the second pattern overlap, the isocyanate compound that is not in contact with the imino compound is liable to cause thermal decomposition, and thereafter, the imino compound in the pattern causes bleeding. Even if it occurs, the formation of a heat-colored body with the isocyanate compound after decomposition is rare, so that it has the effect of maintaining the initial image pattern for a long period of time.

According to a fourth aspect of the present invention, one of the thermosensitive chemicals is constituted by a leuco dye, and the other thermosensitive chemical is constituted by its color developer. According to the invention, one of the thermosensitive chemicals is constituted by a diazonium salt, and the other thermosensitive chemical is constituted by a coupler thereof.

Then, after the portion 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, whereby the invention according to claim 4 is achieved. In the above, the unreacted leuco dye and / or color developer contained in the first pattern and the second pattern are easily deactivated, so that even if the leuco dye and / or color developer bleeds thereafter, heat coloring is performed. In the invention according to claim 5, the unreacted diazonium salt contained in the first pattern and the second pattern is easily deactivated by inducing a photolysis reaction. Even if the coupler or the like causes bleeding, there is no occurrence of a heated color-forming body.

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

[Brief description of the 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. 1A.

[Explanation of symbols]

 1 First pattern 2 Second pattern 3 Third pattern

Claims (5)

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