JPH06255248A - Information recording method - Google Patents

Abstract

(57) [Abstract] [Purpose] Higher security because it is readable only when appropriate means are used, and forgery prevention information is given to each of the information recording media by individual random pattern. Provide a new recording method. A recording comprising a support and a thermosensitive coloring layer containing an electron-accepting compound and an electron-donating compound which develops a color upon reaction with the electron-accepting compound, which are laminated on a support. Due to the difference in thermal energy applied to the information recording medium provided with a layer, a preservable printed image,
An information recording method characterized in that a thermoreversible printed image can be selectively formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to information of an information recording medium such as a prepaid card, a cash card, a credit card, a betting ticket, various voting tickets, a ticket such as a ticket or a commuter ticket, and various information holding information such as tickets. It relates to a recording method.

[0002]

2. Description of the Related Art With the recent widespread use of various types of cards and the like, there are various risks of forgery, falsification, and unauthorized use, and there is a constant demand for new fraud prevention techniques.

Therefore, various methods have been proposed for preventing counterfeiting or falsification of securities, boarding tickets, commuter tickets, horse betting tickets, prepaid cards, and the like. Among them, as a magnetic method, when a magnetic recording layer is provided on a base material and information is recorded,
There are various methods such as changing the magnetic density and the signal encoding method so that reading and writing cannot be performed with ordinary devices, a method of providing fixed data such as a magnetic barcode, and a method of providing a magnetic shield layer on the magnetic recording layer. is there. These methods are mainly intended to prevent illegal reading or rewriting of the value information held by the information recording medium.

On the other hand, for preventing forgery of the information recording medium,
It is also conceivable to provide the information recording medium with authenticity determination information for determining whether the information recording medium is genuine. Among these methods, as a method that uses vision, a method that uses a hologram that uses light interference to make a three-dimensional image appear when exposed to light, and a pattern is printed invisible using fluorescent ink. There is a method of printing a hidden character that emits fluorescence when exposed to ultraviolet rays so that the pattern can be visually confirmed. Also, JP-A-59-440
82, JP-A-2-6193, JP-A-3-
Japanese Patent No. 231394 discloses a method of utilizing forgery prevention information by a thermochromic material.

[0005]

Although the anti-counterfeiting effect is enhanced by providing the authenticity determination information in this way, the authenticity determination information formed on the information recording medium is formed by printing a pattern in advance. Therefore, there is a problem in that it is inevitably restricted to a specific limited pattern due to the complexity of printing. In other words, the anti-counterfeit information provided on the information recording medium is preferably different for each information recording medium, and the anti-counterfeit information is preferably a random pattern that is difficult to copy. Furthermore, these anti-counterfeit information are
The anti-counterfeiting effect can be further enhanced as long as the information cannot be read in a normal state and can be read only by using an appropriate means.

[0006]

The inventor of the present invention can read only by using the appropriate means as described above, and forgery prevention information by individual random patterns on each information recording medium. As a result of conducting various studies to provide a new information recording method with higher security, the layer containing a discoloration temperature controlling compound, an electron-accepting compound and the electron-accepting property on a support. Using an information recording medium provided with a recording layer formed by laminating a thermosensitive coloring layer containing an electron-donating compound that develops a color when reacted with a compound,
The present invention has led to the invention of an information recording method capable of selectively forming a preservative print image and a thermoreversible print image depending on the difference in heat energy applied to the recording layer.

In the information recording method of the present invention, by combining the normal thermosensitive recording and the reversible thermosensitive recording exhibiting thermochromism, it is possible to arbitrarily record the forgery prevention information with higher security. Next, the means and principle for forming the forgery prevention information by the information recording method of the present invention will be described.

A recording layer in which a thermosensitive color-developing layer containing an electron-accepting compound and an electron-donating compound which develops a color by a reaction with the electron-accepting compound is provided in this order on the color-changing temperature-controlling compound layer containing the color-changing temperature-controlling compound. A thermal head,
By printing by a thermal method such as a hot pen or laser light irradiation, first, the thermosensitive coloring layer develops color. This temperature is defined as T2. In this case, the upper thermosensitive coloring layer only develops color, but when printing is performed at a temperature T1 higher than T2, the thermosensitive coloring layer and the color-changing temperature adjusting compound layer thereunder are melt-mixed, and as a result, the color-changing temperature is increased. The control compound, the electron-accepting compound, and the electron-donating compound that develops a color by the reaction with the electron-accepting compound are all mixed to form a state. As described above, the temperature required for the heat-sensitive coloring layer and the color-changing temperature control compound layer to start melt mixing is T
Defined as 1.

The portion printed by heating at a temperature of T1 or higher is
The thermosensitive coloring layer and the discoloration temperature controlling compound layer are melt-mixed, and as a result, thermochromism is exhibited. That is, it becomes a thermoreversible discoloring part in which two states, which are colorless and colored or have different color tones, reversibly change at a specific temperature. The temperature at which the color-developed state of the thermoreversible color-change portion formed in this way changes is defined as T3. That is, T1, T2,
The order of T3 is T3 << T2 <T1. In particular,
T2 may be any temperature as long as it develops a color of an ordinary thermosensitive recording medium, and is generally about 100 ° C to 150 ° C. Therefore T3
Should be set to 100 ° C. or lower. This T3
Is mainly by selecting a color-changing temperature controlling compound −
The temperature can be arbitrarily selected within the range of 100 ° C to 200 ° C, but in order to make the effect of the present invention sufficient, 50 ° C to 90 ° C.
Is preferred.

In the recording layer having such properties, T2 or more and T
Temperature less than 1 (T2 = TF <T1 if TF) and T1
By printing using two types of temperatures (TR ≧ T1 where TR is referred to as above), a printing portion showing no thermochromism in the recording layer and a thermoreversible printing portion showing thermochromism at a specific temperature T3 Can be selectively and arbitrarily formed. That is, the portion printed at the temperature TF is the storage (remaining) printing portion, and the portion printed at the temperature TR is the thermoreversible printing portion. As described above, the storage portion and the thermoreversible printing portion can be selectively and arbitrarily formed on the recording layer, and this pattern can be used as forgery prevention information. Of course, it is also possible to record the value information of the information recording medium in this recording layer in addition to the forgery prevention information. The value information here means the winning numbers in the lottery, the frequency of the prepaid card, etc.
The information directly related to the value held by the information recording medium.

Hereinafter, each component of the present invention will be described in detail. Alcohols can be used as the discoloration temperature adjusting compound used in the present invention. Specifically, alcohols include monohydric alcohols to polyhydric alcohols and their derivatives. These compounds are exemplified below.
n-lauryl alcohol, n-myristyl alcohol,
n-cetyl alcohol, n-staallyl alcohol, n
-Aicosyl alcohol, n-docosyl alcohol, n
-Melisyl alcohol, isocetyl alcohol, isostearyl alcohol, isodocosyl alcohol, oleyl alcohol, etc. In addition, esters, ketones, and ethers can be used as the discoloration temperature adjusting compound. These discoloration temperature adjusting compounds may be used alone, but two or more kinds of compounds may also be used.

The electron-accepting compound used in the present invention is an acidic substance, preferably a phenol derivative, an aromatic carboxylic acid derivative, an N, N'-diarylthiourea derivative or a zinc salt of an organic compound. The polyvalent metal salt of can be used. Particularly preferred are phenol derivatives, specifically p-phenylphenol,
p-hydroxyacetophenone, 4-hydroxy-4 '
-Methyldiphenyl sulfone, 4-hydroxy-4'-
Isopropoxydiphenyl sulfone, 4-hydroxy-
4'-benzenesulfonyloxydiphenyl sulfone,
1,1-bis (p-hydroxyphenyl) propane,
1,1-bis (p-hydroxyphenyl) pentane,
1,1-bis (p-hydroxyphenyl) hexane,
1,1-bis (p-hydroxyphenyl) cyclohexane, 2,2-bis (p-hydroxyphenyl) propane, 2,2-bis (p-hydroxyphenyl) hexane, 1,1-bis (p-hydroxyphenyl) 2-ethylhexane, 2,2-bis (3-chloro-4-hydroxyphenyl) propane, 1,1-bis (p-hydroxyphenyl) -1-phenylethane, 1,3-di- [2
-(P-Hydroxyphenyl) -2-propyl] benzene, 1,3-di- [2- (3,4-dihydroxyphenyl) -2-propyl] benzene, 1,4-di- [2-
(P-Hydroxyphenyl) -2-propyl] benzene, 4,4'-dihydroxydiphenyl ether, 4,
4'-dihydroxydiphenyl sulfone, 3,3'-dichloro-4,4'-dihydroxydiphenyl sulfone,
3,3'-diallyl-4,4'-dihydroxydiphenyl sulfone, 3,3'-dichloro-4,4'-dihydroxydiphenyl sulfide, methyl 2,2-bis (4-hydroxyphenyl) acetate, 2,2- Butyl bis (4-hydroxyphenyl) acetate, 4,4'-thiobis (2-
t-butyl-5-methylphenol), 2,2'-bis (4-hydroxyphenylthio) diethyl ether,
1,7-di (4-hydroxyphenylthio) -3,5-
Dioxaheptane, benzyl p-hydroxybenzoate,
Examples include chlorobenzyl p-hydroxybenzoate, dimethyl 4-hydroxyphthalate, benzyl gallate, stearyl gallate, salicylanilide, and 5-chlorosalicylanilide.

The electron-donating compound (electron-donating color-developing organic compound) used in the present invention which develops a color upon reaction with the electron-accepting compound is generally used in pressure-sensitive recording paper and heat-sensitive recording paper. You can use what you have. To give a specific example

(1) Triarylmethane compound 3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide (crystal violet lactone), 3,3-bis (p-dimethylaminophenyl) phthalide, 3- (p-dimethylaminophenyl) -3-
(1,2-dimethylindol-3-yl) phthalide,
3- (p-dimethylaminophenyl) -3- (2-methylindol-3-yl) phthalide, 3- (p-dimethylaminophenyl) -3- (2-phenylindole-
3-yl) phthalide, 3,3-bis (1,2-dimethylindol-3-yl) -5-dimethylaminophthalide, 3,3-bis (1,2-dimethylindole-3-)
Yl) -6-Dimethylaminophthalide, 3,3-bis (9-ethylcarbazol-3-yl) -5-dimethylaminophthalide, 3,3-bis (2-phenylindol-3-yl) -5 -Dimethylaminophthalide, 3-p
-Dimethylaminophenyl-3- (1-methylpyrrol-2-yl) -6-dimethylaminophthalide and the like,

(2) Diphenylmethane compound 4,4'-bis (dimethylaminophenyl) benzhydrylbenzyl ether, N-chlorophenylleuco auramine, N-2,4,5-trichlorophenyl leuco auramine, etc.

(3) Xanthene compounds Rhodamine B anilinolactam, Rhodamine B p-chloroanilinolactam, 3-diethylamino-7-dibenzylaminofluorane, 3-diethylamino-7-octylaminofluorane, 3- Diethylamino-7-phenylfluorane, 3-diethylamino-7-chlorofluorane, 3-diethylamino-6-chloro-7-methylfluorane, 3-diethylamino-7- (3,4-dichloroanilino) fluorane, 3 -Diethylamino-7
-(2-chloroanilino) fluorane, 3-diethylamino-6-methyl-7-anilinofluorane, 3-
(N-ethyl-N-tolyl) amino-6-methyl-7-
Anilinofluorane, 3-piperidino-6-methyl-7
-Anilinofluorane, 3- (N-ethyl-N-tolyl) amino-6-methyl-7-phenethylfluorane,
3-diethylamino-7- (4-nitroanilino) fluorane, 3-dibutylamino-6-methyl-7-anilinofluorane, 3- (N-methyl-N-propyl) amino-6-methyl-7-anilino Fluoran, 3- (N-
Ethyl-N-isoamyl) amino-6-methyl-7-anilinofluorane, 3- (N-methyl-N-cyclohexyl) amino-6-methyl-7-anilinofluorane,
3- (N-ethyl-N-tetrahydrofuryl) amino-
6-methyl-7-anilinofluorane, etc.,

(4) Thiazine-based compound benzoyl leuco methylene blue, p-nitrobenzoyl leuco methylene blue, etc.

(5) Spiro compound 3-methylspirodinaphthopyran, 3-ethylspirodinaphthopyran, 3,3'-dichlorospirodinaphthopyran, 3-benzylspirodinaphthopyran, 3-methylnaphtho- (3 -Methoxybenzo) spiropyran, 3-propylspirobenzopyran and the like can be mentioned, and these can be used alone or in combination of two or more.

Further, a heat fusible substance may be contained in order to improve the thermal response of each layer constituting the recording layer of the information recording medium used in the information recording method of the present invention.
Those having a melting point of 60 ° C. to 180 ° C. are preferable, and those having a melting point of 80 ° C. to 140 ° C. are particularly preferable, and a sensitizer used in general thermal recording paper can also be used. Examples of these compounds include waxes such as N-hydroxymethylstearic acid amide, stearic acid amide, and palmitic acid amide, naphthol derivatives such as 2-benzyloxynaphthalene, and biphenyl derivatives such as p-benzylbiphenyl and 4-allyloxybiphenyl. 1,2-bis (3-methylphenoxy) ethane,
Polyether compounds such as 2,2′-bis (4-methoxyphenoxy) diethyl ether and bis (4-methoxyphenyl) ether; carbonic acid such as diphenyl carbonate, dibenzyl oxalate and bis (p-methylbenzyl) oxalate. Examples thereof include oxalic acid diester derivatives, which can be used alone or in combination. In order to obtain a sufficient thermal response, the amount of the electron donating compound is 30 to 30
It is preferable to use 700% by weight, and further 50 to 5
It is more preferable to use 50% by weight.

Various additives can be added to each layer constituting the recording layer. For example, as a pigment,
Diatomaceous earth, talc, kaolin, calcined kaolin, calcium carbonate, magnesium carbonate, titanium oxide, zinc oxide,
Examples thereof include inorganic pigments such as silicon oxide and aluminum hydroxide, and organic pigments such as urea-formalin resin. Inorganic and organic infrared absorbers that convert laser light into heat, as well as higher fatty acid metal salts such as zinc stearate and calcium stearate for the purpose of preventing head wear and sticking, paraffin, oxidized paraffin, polyethylene,
Waxes such as polyethylene oxide, stearic acid amide, and castor wax; dispersants such as sodium dioctylsulfosuccinate; UV absorbers such as benzophenone-based and benzotriazole-based; surfactants, fluorescent dyes, etc., if necessary. Is added.

The binder used in the discoloration temperature controlling compound layer and the heat-sensitive recording layer of the present invention includes starches, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, gelatin, casein, polyvinyl alcohol, modified polyvinyl alcohol, sodium polyacrylate. , Acrylic acid amide / acrylic acid ester copolymer, acrylic acid amide / acrylic acid ester / methacrylic acid terpolymer, alkali salt of styrene / maleic anhydride copolymer, alkali of ethylene / maleic anhydride copolymer Water-soluble adhesives such as salts, polyvinyl acetate, polyurethane, polyacrylic acid esters, styrene / butadiene copolymers, acrylonitrile / butadiene copolymers, methyl acrylate / butadiene copolymers, ethylene / acetic acid Such as latex nil copolymer.

The layer structure of the information recording medium used in the information recording method of the present invention will be described. The recording layer provided in the information recording medium used in the information recording method of the present invention comprises a layer containing a color-changing temperature adjusting compound, an electron-accepting compound thereon, and an electron-donating property which develops a color by a reaction with the electron-accepting compound. It can be formed by providing a thermosensitive coloring layer containing a compound, but an intermediate layer is provided between these two layers for the purpose of sensitization, improvement of adhesiveness, heat absorption, etc., or barrier property. It doesn't matter. Also, this recording layer is formed on the support, but an undercoating layer having a heat insulating property, a smoothness, a heat absorbing property, a barrier property or the like between the support and the recording layer and a value information are recorded. A magnetic recording layer for this purpose may be provided. However, the value information held by the information recording medium of the present invention may be recorded / reproduced not only by magnetic recording but also by optical or electrical means.
In the recording layer, a portion holding such value information does not hinder the reading of the forgery prevention information of the recording layer,
Alternatively, it may be provided below or above the recording layer, or on the opposite surface of the support provided with the recording layer. Of course, a protective layer may be provided on the recording layer or on the portion where the value information is recorded, such as the magnetic recording layer, if necessary.

The support used for the information recording medium in the information recording method of the present invention includes paper, various non-woven fabrics, woven fabrics, synthetic resin films, foam films, synthetic resin laminated paper, synthetic paper, metal foil, glass, etc. Alternatively, a composite sheet in which these are combined can be optionally used according to the purpose, but the invention is not limited thereto.

[0024]

In the information recording medium using the information recording method of the present invention, preservative printing and thermoreversible printing can be selectively formed in an arbitrary pattern, which is used as forgery prevention information. Very high security can be achieved by using it. That is, in the information recording method of the present invention, it is possible to provide different patterns of forgery prevention information for each information recording medium, so that high security can be secured. Moreover, since the anti-counterfeit information is partially or wholly thermoreversible print, the print pattern changes at a specific temperature. Forgery becomes even more difficult if it is determined whether or not the information recording medium is genuine by utilizing the change in the specific pattern. That is, first, the print pattern of the recording layer is visually or mechanically read at a temperature of T3 or lower, and then the print pattern of the recording layer is similarly read at a temperature of T3 or higher. By doing so, the color-developing state of the thermoreversible printing portion changes before and after the temperature T3, and thus two types of information can be read from one information recording medium. Then, by comparing both of these pieces of information to determine whether the information recording medium is genuine, very high security can be ensured.

[0025]

EXAMPLE 1 Next, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto. FIG. 1 is a sectional view of a prepaid card utilizing the present invention. In the case of this prepaid card, a recording layer 3 comprising a thermosensitive coloring layer 1 and a color change temperature adjusting compound layer 2 is formed on one side of a substrate, and a magnetic recording layer 5 and a hiding layer 6 are provided on the other side.

2 to 5 show examples of printing performed on the recording layer of the prepaid card shown in FIG. 1, in which T1 and T2 are applied to the recording layer.
The information is printed at the temperature and random anti-counterfeit information is printed. Since this printing can be arbitrarily performed at the time of issuing the card, different patterns can be formed on each prepaid card without complicated operations. In the embodiment, the thermoreversible print portion formed on the recording layer changes to colored on the lower temperature side than the temperature T3 and colorless on the high temperature side. Figure 2
Is a pattern of the printed portion of the card at a temperature of T3 or lower. At this temperature, the thermally reversibly changed portion is in a color-developed state, so that patterns of both the preservative print portion and the thermoreversible print portion are visible. FIG. 3 shows A- in the state of FIG.
The signal obtained when the printed portion is optically read along the line A is shown. FIG. 4 is a diagram when the same prepaid card is heated to a temperature of T3 or higher and the thermoreversible portion is decolored and the printing pattern is changed. Similarly, this pattern is read along the line BB in FIG. In the system using the information recording medium of the present invention, high security can be ensured even if it is judged whether it is genuine or not only by the signal of FIG. 5, but it is higher if it is judged by comparing both FIG. 3 and FIG. Security will be obtained.

[0027]

[Embodiment 2] FIGS. 6 to 9 are examples in which the present invention is applied to a prepaid card. Printing is performed at a temperature of T1 and T2 on a recording layer of a prepaid card having the same layer structure as in FIG. It is printed. Since this printing can be arbitrarily performed at the time of issuing the card, different patterns can be formed on each prepaid card without complicated operations. In the embodiment, the thermoreversible printing portion formed on the recording layer changes to colorless on the low temperature side and colored on the high temperature side of the temperature T3. FIG. 6 is a pattern of the print portion of the card at a temperature of T3 or lower. At this temperature, the thermo-reversibly changed portion is in a decolored state, so only the pattern of the preservable print portion is visible. FIG. 7 shows CC in the state of FIG.
The signal obtained when the print portion is optically read along the line of FIG. FIG. 8 is a diagram when the same prepaid card is heated to a temperature of T3 or higher and the thermoreversible portion develops color and the print pattern changes. Similarly, FIG. 9 shows the pattern read along the line D-D.
Is shown in. In the system using the information recording medium of the present invention, high security can be ensured even if it is judged whether it is genuine or not by only the signal of FIG. Security will be obtained.

[0028]

According to the present invention, different forgery determination information can be easily provided to each information recording medium at low cost. Moreover, the anti-counterfeiting information is a random pattern, part of which is preservative information, and the remaining part reversibly changes the coloring and decoloring or reversibly changes the color tone at a certain temperature. Since the information is thermo-reversible, extremely high security was realized.

[Brief description of drawings]

FIG. 1 is a sectional view of a prepaid card using the present invention.

FIG. 2 is an explanatory view showing a printing pattern of a recording layer of a prepaid card on a temperature lower side than a temperature T3.

FIG. 3 is a diagram for explaining signals when the printing section of the prepaid card in FIG. 2 is optically read along the direction AA.

FIG. 4 is a diagram illustrating a print pattern when the recording layer of the prepaid card in FIG. 2 is heated to a temperature of T3 or higher and the thermoreversible portion is changed.

5 is a diagram for explaining signals when the print pattern of FIG. 4 is optically read along BB.

FIG. 6 is an explanatory diagram showing a print pattern of a recording layer of a prepaid card at a temperature lower than a temperature T3.

FIG. 7 is a diagram for explaining signals when the printing portion of the prepaid card in FIG. 6 is optically read along the direction CC.

FIG. 8 is a diagram illustrating a print pattern when the recording layer of the prepaid card in FIG. 6 is heated to a temperature of T3 or higher and the thermoreversible portion is changed.

FIG. 5 is a diagram illustrating a signal when the print pattern of FIG. 8 is optically read along DD.

[Simple explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermosensitive coloring layer 2 Discoloration temperature adjusting compound layer 3 Recording layer 4 Substrate 5 Magnetic recording layer 6 Hiding layer

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 13, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a sectional view of a prepaid card using the present invention.

FIG. 2 is an explanatory view showing a printing pattern of a recording layer of a prepaid card on a temperature lower side than a temperature T3.

FIG. 3 is a diagram for explaining signals when the printing section of the prepaid card in FIG. 2 is optically read along the direction AA.

FIG. 4 is a diagram illustrating a print pattern when the recording layer of the prepaid card in FIG. 2 is heated to a temperature of T3 or higher and the thermoreversible portion is changed.

5 is a diagram for explaining signals when the print pattern of FIG. 4 is optically read along BB.

FIG. 6 is an explanatory diagram showing a print pattern of a recording layer of a prepaid card at a temperature lower than a temperature T3.

FIG. 7 is a diagram for explaining signals when the printing portion of the prepaid card in FIG. 6 is optically read along the direction CC.

FIG. 8 is a diagram illustrating a print pattern when the recording layer of the prepaid card in FIG. 6 is heated to a temperature of T3 or higher and the thermoreversible portion is changed.

FIG. 9 is a diagram illustrating a signal when the print pattern of FIG. 8 is optically read along DD.

[Brief description of reference numerals] 1 thermosensitive coloring layer 2 color change temperature adjusting compound layer 3 recording layer 4 substrate 5 magnetic recording layer 6 hiding layer

Claims (1)

[Claims] 1. A support is provided with a layer containing a color-changing temperature adjusting compound and a thermosensitive coloring layer containing an electron-accepting compound and an electron-donating compound which develops a color when reacted with the electron-accepting compound. An information recording method characterized by using an information recording medium provided with a recording layer, and selectively forming a storable print image and a thermoreversible print image by the difference in heat energy applied to the recording layer. .