JP2001054992A - Concealing label and mailing medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To visually observe transmission information without releasing a concealing layer part and to allow an evidence of reading surreptitiously to be retained by forming a concealing layer provided at a surface side of a transparent base material with a thermally achromatizing ink achromatizing at a predetermined temperature or higher than an ambient temperature. SOLUTION: The concealing label 1 comprises a concealing layer 3 provided at a surface side of a transparent base material 2. The layer 3 is formed by coating with a thermally achromatizing ink achromatizing by heating at a predetermined temperature or higher than an ambient temperature to see through information displayed on a substrate. An adhesive layer 4 and a release sheet 5 are sequentially provided on a rear surface side of the material 2. Thus, a secret can be protected only by adhering the label 1 onto transmission information of a postcard or the like. In the case of observing the concealed information, the information can be visually observed only by heating without releasing the label 1. If the information is once illegally observed by heating the layer 3, the layer 3 remains a state in which the layer 3 has been seen through, its illegal deed can be confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for delivering the contents of communication information written on a mailing medium such as a postcard or other information transmission medium without being seen by a third party before reaching the recipient. The present invention relates to a concealment label and a mailing medium which enable the user to do so.

[0002]

2. Description of the Related Art Conventionally, in mailing media such as postcards, the contents of displayed transmission information can be easily viewed from the outside. Is put in an envelope and mailed. However, for example, even if the amount of information to be transmitted is small and the amount of information can be sufficiently recorded and displayed even if the postcard is originally used, it must be sent in a sealed post with a high postage fee only for confidentiality, which is a wasteful cost. There's a problem. For this reason, recently, in order to keep the transmission information displayed on the postcard from being easily read from the outside, a concealing label that can be peelably attached to the transmission information entry surface has been used. ing.

[0003] These concealed labels can be read by a third party visually by pasting the concealed layer portion of the concealed label on the transmission information entry surface of the postcard base material before mailing to conceal the transmitted information. The original recipient who received the postcard after mailing peels off the concealing layer part of the concealing label,
The transmitted information on the postcard base material can be read in a visible state. Therefore, the conventional concealment label needs to have a label structure that can be peeled off again at the recipient after being once attached to the postcard,
For this purpose, a special adhesive that can be peeled off must be used, and a complicated laminated structure must be provided for delamination, and thus there is a problem that it takes time and cost to produce a concealment label. Further, in the conventional concealing label, the concealing layer portion must be peeled off from the postcard base material. There is also a danger of breakage.

[0004] In addition, a concealed label once affixed to a mailing medium so that a malicious third party can read information transmitted on a mailing medium such as a postcard before the postcard reaches the recipient. If you peel off the contents without scratching, read through the contents, and then temporarily adhere the concealing label to the mailing medium again using a peelable adhesive, if it is halfway before the postcard reaches the recipient Even if a third party sees the contents of the postcard, there is no evidence of it, and there is a risk that the transmitted information may be leaked without the recipient's knowledge. There is a problem. In addition, since the concealing layer portion of the concealing label is peeled off from the mailing medium, the concealing layer portion which has been peeled off becomes garbage, and waste is generated.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a concealment label for keeping confidential information transmitted on a mailing medium such as a postcard and other information transmitting media, and a mailing service which enables confidentiality of transmitted information. It is a medium that uses a special adhesive to peel off the concealing layer part, or conceals the transmitted information once without providing a complicated laminated structure, and sends it to the concealing layer part of the concealing label. Can be read without having to peel off the transmitted information, and even if a third party has stolen and read the message before it reaches the recipient, the proof that the stolen has been read remains, so fraudulent acts Concealment label and mailing medium that can confirm that the information and the information have been leaked.

[0006]

Means for Solving the Problems To achieve the above object, the concealing label of the present invention is provided with a concealing layer on the front side of a transparent substrate, and an adhesive layer on the back side of the transparent substrate. In a concealing label provided with release paper sequentially, the concealing layer is formed of a heat-sensitive decolorable ink which is decolored at a predetermined temperature higher than room temperature.

In this case, the heat-sensitive decolorizable ink comprises an ink composition dispersed in a solvent, and the ink composition comprises a color former, a developer, and an erasing agent; And the developer interact with each other to develop a color,
The erasing agent is desirably an ink having a property of preferentially dissolving one of a color developer and a coloring compound when the ink composition is melted.

Further, the mailing medium of the present invention is a mailing medium on which transmission information is displayed, which is formed on at least the transmission information with a thermosensitive decoloring ink which is decolored on a front surface side at a predetermined temperature higher than normal temperature. A transparent substrate provided with a concealing layer.

[0009] Further, in the mailing medium, the transmission information is transaction information.

[0010] Further, the concealing label or the mailing medium is characterized in that the concealing layer has a printed display using a thermosensitive decoloring ink having a hue different from that of the thermosensitive decoloring ink.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a concealing label and a mailing medium of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of an embodiment of the concealing label of the present invention, and FIG.
FIG. 3 is a cross-sectional view of the mailing medium of the present invention. FIG. 3 is a perspective view illustrating a state in which the concealing label of the present invention is attached to a postcard.
Is a perspective view of the mailing medium of the present invention, and FIG. 5 is a perspective view showing a state where the mailing medium of the present invention is heated.

As shown in FIG. 1, the concealing label 1 of the present invention is decolorized by heating the surface side of the transparent base material 2 at a predetermined temperature higher than room temperature to see through the information displayed on the base. A concealing layer 3 formed by applying a heat-sensitive decolorable ink capable of being applied is provided, and an adhesive layer 4 and a release paper 5 are sequentially provided on the back side of the transparent substrate 2. I have. Examples of the transparent substrate 2 include resin films of polyethylene, polypropylene, polyester, etc., vinyl chloride, PMMA, ABS, polyolefin, PET-
G, polycarbonate, acrylonitrile-styrene copolymer, cellulose propionate, cellulose acetate butyrate, and a polymer alloy made of these plastic materials are used. On the upper part of the concealing layer 3, if necessary, a heat-sensitive decoloring ink having the same properties as those used for the concealing layer 3 is used. The printed display 3a of a picture, mark, pattern, character, or the like may be displayed by a known printing method such as gravure, offset, silk, flexo, or letterpress.

In the present invention, the heat-sensitive decoloring ink used for the hiding layer 3 will be specifically described. This heat-sensitive decolorable ink basically comprises three components of a color former, a color developer, and an erasing agent. The color-forming compound here is a precursor compound of a dye, and the color developer is a compound that colors the color-forming compound by an interaction such as transfer of electrons with the color-forming compound, and the erasing agent is It is a compound having the property of preferentially dissolving either a color developing compound or a developer at the time of melting. When these three components coexist, they take two states, a color development state and a color erasing state. One state is
Since the coloring compound and the developer are present beyond the equilibrium solubility of the erasing agent, the coloring compound and the developing agent within the range of the equilibrium solubility are not colored, but the color exceeding the equilibrium solubility is colored. This is a color development state as a result of the interaction between the coloring compound and the developer. The other state is a decolored state in which the erasing agent takes up a large amount of the color developing compound or the developer beyond the equilibrium state and the interaction of the color developing compound or the developer is reduced. .

If it is assumed that the erasing agent has a property of preferentially dissolving the color developing agent at the time of melting, at room temperature, each phase of the color developing compound, the color developing agent and the erasing agent is in a state where the phases are separated. Is close to the equilibrium state, and in this state, the color-forming compound and the color developer are brought into a colored state as a result of the interaction. When the material in this state is heated to a temperature equal to or higher than the melting point, the color developer is preferentially dissolved in the molten erasing agent and interacts with the color forming compound, resulting in a decolored state. When the three components in the molten state are quenched, the erasing agent becomes amorphous by taking in a developer in an amount exceeding the equilibrium solubility and becomes colorless at room temperature. Although this colorless state is not an equilibrium state, it has a sufficiently long life if it is lower than the glass transition point, and does not easily transition from an amorphous state to an equilibrium state even at a temperature higher than the glass transition temperature.

Examples of the coloring compound include leuco auramines, diaryl phthalides, polyaryl carbinols, acyl auramines, aryl auramines, rhodamine B lactams, indolines, spiropyrans,
Electron-donating organic compounds such as fluorans.

Specific examples of the color-forming compound include crystal violet lactone, malachite green lactone, 2-anilino-6- (N-cyclohexyl-N-methylamino) -3-methylfluoran, and 2-anilino-
3-methyl-6- (N-propylamino) fluoran,
3- [4- (4-phenylaminophenyl) aminophenyl] amino-6-methyl-7-chlorofluoran, 2
-Anilino-6- (N-methyl-N-isobutylamino) -3-methylfluoran, 2-anilino-6- (dibutylamino) -3-methylfluoran, 3-chloro-
6- (cyclohexylamino) fluoran, 2-chloro-6- (diethylamino) fluoran, 7- (N, N-
Dibenzylamino) -3- (N, N-diethylamino)
Fluoran, 3,6-bis (diethylamino) fluoran-γ- (4′-nitroanilino) lactam, 3-diethylaminobenzo [a] -fluoran, 3-diethylamino-6-methyl-7-aminofluoran, 3-diethylamino- 7-xylidinofluoran, 3- (4-diethylamino-2-ethoxyxenyl) -3- (1-ethyl-2-methylindol-3-yl) -4-azaphthalide, 3- (4-diethylaminophenyl) -3 -(1-
Ethyl-2-methylindol-3-yl) phthalide,
3-diethylamino-7-chloroanilinofluoran,
3-diethylamino-7,8-benzofluoran, 3,
3-bis (1-n-butyl-2-methylindole-3
-Yl) phthalide, 3,6-dimethylethoxyfluoran, 3,6-diethylamino-6-methoxy-7-aminofluoran, DEPM, ATP, ETAC, 2- (2
-Chloroanilino) -6-dibutyldinofluoran, crystal violet carbinol, malachite green carbinol, N- (2,3-dichlorophenyl) leuco auramine, N-benzoyl auramine, rhodamine B lactam, N-acetyl auramine, N-phenyl auramine, 2- (phenyliminoethanedylidene)-
3,3-dimethylindoline, N, 3,3-trimethylindolinobenzosubiropyran, 8'-methoxyN,
3,3-trimethylindolinobenzosubiropyran, 3
-Diethylamino-6-methyl-7-chlorofluoran, 3-diethylamino-7-methoxyfluoran, 3
-Dielamino-6-benzyloxyfluoran, 1,
2-benzo-6-diethylaminofluoran, 3,6-
Di-p-toluidino-5-dimethylfluorane, phenylhydrazide-γ-lactam, 3-amino-5-methyl-fluoran and the like. These can be used alone or as a mixture of two or more kinds.

The color developing agents which are components of the ink composition used in the present invention include phenols, phenol metal salts,
Carboxylic acid metal salts, benzophenones, sulfonic acids,
Acid compounds such as sulfonates, phosphoric acids, metal phosphates, acid phosphates, metal acid phosphates, phosphorous acid, metal phosphites, and the like, and again, alone or in combination of two or more. Then, they can be mixed and used.

The erasing agent used in the present invention is preferably as amorphous and colorless and transparent. For this reason, the molecular weight is large, the melting enthalpy change of the crystal per weight is small,
It is desirable that the compound has a small maximum crystal growth rate. Those having a nearly spherical and bulky molecular skeleton such as a steroid skeleton are preferred. The higher the affinity of the developer for the erasing agent is, the higher the solubility of the developer is. For example, a compound having an alcoholic hydroxyl group is suitable. From the viewpoint of the stability of the three components in the decolored state, the glass transition temperature of the erasing agent is preferably room temperature (25 ° C.) or higher, and more preferably 50 ° C. or higher. Preferably, the transition temperature is 150 ° C. or less. Erasers that satisfy these are (a) sterol processed products, (b) cholic acid, lithocholic acid, testosterone, and cortisone, and derivatives thereof, and (c) 5- or more-membered rings having one or more hydroxyl groups. It is a non-aromatic cyclic compound.

Specific examples of the sterol processed product (a) include cholesterol, stigmasterol, pregnenolone, methylandrostenediol, estradiol benzoate, epiandrostene, stenolone, β
-Sitosterol, pregnenolone acetate, β-cholestenol, 5,16-pregnadien-3β-ol-20-one, 5α-pregnene-3β-ol-2
0-one, 5-pregnene-3β, 17-diol-2
0-one 21-acetate, 5-pregnene-3β,
17-diol-20-one 17-acetate, 5-
Pregnene-3β, 21-diol-20-one 21
-Acetate, 5-pregnene-3β, 17-diol diacetate, locogenin, tigogenin, esmilagenin, hecogenin, diosgenin and derivatives thereof. These can be used alone or as a mixture of two or more kinds. Among them, those suitable for obtaining a stable decolored state include methylandrostenediol, hecogenin, locogenin, tigogenin, diosgenin, and esmilagenin.

(B) Specific examples of cholic acid, lithocholic acid, testosterone, and cortisone, and derivatives thereof, include cholic acid, cholic acid methyl ester,
Examples include lithocholic acid, lithocholic acid methyl ester, hydroxycholic acid, hydroxycholic acid methyl ester, testosterone, methyltestosterone, 11α-hydroxymethyltestosterone, and hydrocortisone. Among them, those having two or more hydroxyl groups are particularly preferable.

(C) The non-aromatic cyclic compound having at least one 5-membered ring having at least one hydroxyl group includes, for example, an alicyclic monohydric alcohol (for example, cyclododecanol) and an alicyclic monohydric alcohol. Dihydric alcohols (for example, 1,4-cyclohexanediol, 1,2-cyclohexanediol,
1,2-cyclododecanediol), saccharides and derivatives thereof (for example, glucose and saccharose), and alcohols having a cyclic structure (for example, 1,2,5,6-diisopropylidene-D-mannitol).

In the above, the erasing agent of (b) has a very high compatibility with the color developing agent at the time of melting as compared with the erasing agent of (a) and hardly causes phase separation even when the three components are solidified. (C)
The erasing agent of (a) has a high affinity with the erasing agent of (a), and hardly causes phase separation even after solidification.

A heat-sensitive decolorizable ink composition is obtained by dispersing the above three components of a color former, a color developer, and an erasing agent in a solvent in a colored state. The compounding ratio of each component is such that the color former is 1 part by weight, the developer is 0.1 to 10 parts by weight,
More preferably, it is 1 to 2 parts by weight. When the amount of the developer is less than 0.1 part by weight, color development is insufficient, and when the amount exceeds 10 parts by weight, it is difficult to sufficiently reduce the interaction between the two. The erasing agent is used in an amount of 1 part by weight of the coloring compound.
To 200 parts by weight, more preferably 10 to 100 parts by weight. If the amount is less than 1 part by weight, it is difficult to cause a state change between the color-developed state and the decolored state, and if it exceeds 200 parts by weight, the coloration of the ink is sufficient.

The solvent of the thermal decoloring ink composition is preferably water, but an organic solvent can be used. When using an organic solvent, a color former, a developer, and an erasing agent may be dispersed using a surfactant,
It is more preferable that these are microencapsulated and dispersed. The ratio of the coloring compound, the color developer and the erasing agent in the ink composition is preferably from 0.1 to 10% by weight, and if it is less than 0.1% by weight, a sufficient print density can be obtained. If the content is more than 10% by weight, the viscosity of the ink composition may be excessive and printing may be difficult. Further, it is preferable that the color-forming compound, the color developer, and the erasing agent dispersed in the solvent are submicron-order particles that do not include particles of 10 μm or more.

The pressure-sensitive adhesive layer 4 provided on the back side of the transparent substrate 2 of the concealing label 1 of the present invention includes, for example, natural rubber, acrylic rubber, silicone rubber, styrene / butadiene rubber, chloroprene rubber, fluororubber,
Neoprene rubber, polybutadiene rubber and the like can be mentioned.
Further, the release paper 5 is configured to be peelable from the pressure-sensitive adhesive layer 4 by forming a silicone coating film or the like on the side contacting the pressure-sensitive adhesive layer 4.

Further, the mailing medium of the present invention is obtained by peeling the release paper 5 from the concealing label 1 of the present invention, and then attaching the release paper 5 on the transmission information displayed on the mailing medium.

[0027]

Next, as an embodiment of the concealing label of the present invention and the mailing medium of the present invention, a case where the written information is concealed by the concealing label and the postcard is mailed will be described with reference to the drawings. For example, when a financial institution mails a `` transaction statement '' to a depositor by postcard, the contents of the `` transaction statement '' can be viewed by a third party until it reaches the recipient of the postcard, that is, the depositor. Need not be. Normally, the "deposit details" show personal information such as deposits and withdrawals that are difficult to be known to third parties. Therefore, in order to protect privacy, mail the information in an envelope or fold or fold it. Posting is performed using postcards that can conceal information.

Therefore, when mailing a postcard 6 in which the address display item 8 is provided on the front side of the postcard and the transaction information 7 of "detailed statement" is displayed on the back side, as shown in FIGS. As described above, the concealing label 1 of the present invention having the size to cover the area of the postcard 6 on which the transaction information 7 of “detailed transaction” is displayed is prepared, and the release paper 5 of the concealing label 1 is attached to the adhesive layer 4. The mailing medium of the present invention is constituted by peeling off the concealment label 1 on the "detailed transaction statement" display section by peeling off the label. FIG. 2 shows a cross-sectional view of the state affixed to postcard 6, which is referred to as a "detailed statement".
The transaction information 7 is in a state in which it cannot be visually read from outside particularly by the concealment layer 3. In this state, mail is sent to the address indicated on the front of the postcard. After the recipient of the postcard receives this postcard, the concealment label 1 attached to the postcard 6 is received.
When heated using a heater such as an iron, for example, from the upper side of the ink, the heat-sensitive decoloring ink used for the concealing layer 3 and the printed display 3a reacts and the color disappears, resulting in a transparent state, as shown in FIG. The transaction information 7 of the “detailed statement” becomes visible, and the content of the “detailed statement” can be confirmed.

Also, if the postcard 6 does not reach the recipient, the concealment label 1 is used by a third party to illegally steal.
If the upper side of the is heated, it cannot be returned to the original concealed state while it is in the decolored state, so when delivered to the recipient, the secret state has already been unlocked halfway That is, it is easy to confirm that someone has illegally peeped.

As described above, the mailing medium of the present invention is prepared by attaching the concealing label of the present invention to the mailing medium.
Temporarily conceal and mail information that you do not want to be known to third parties,
Thereafter, the concealment state is released at the original recipient's hand, thereby enabling the confidentiality of the transmitted information to be maintained. The concealing label of the present invention can be used not only for postal media such as postcards but also for various information transmission media.

[0031]

As described in detail above, the concealment label of the present invention enables the confidentiality of information to be maintained only by pasting it on postal information such as postcards or other information transmission media. In addition, when viewing the concealed transmitted information, the transmitted information can be visually observed only by heating without peeling off the concealed label attached. In addition, the mailing medium of the present invention does not allow the transmission information to be seen by a third party during the mailing or until the mail arrives. Since the concealment layer remains transparent, it can be confirmed that there has been fraud. In particular, when the transmission information displayed on the mailing medium is transaction information, confidentiality of the transaction can be maintained.
In addition, by providing a print display of a color different from that of the concealing layer on the concealing layer, it is possible to display a description or the like for making the transmitted information displayed on the mailing medium visible, so that the recipient of the mailing medium is The procedure for viewing the transmitted information can be explained.

[0032]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of a concealment label of the present invention.

FIG. 2 is a sectional view of a mailing medium of the present invention.

FIG. 3 is a perspective view illustrating a state in which the concealing label of the present invention is attached to a postcard.

FIG. 4 is a perspective view of a mailing medium of the present invention.

FIG. 5 is a perspective view showing a state in which the mailing medium of the present invention is heated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concealment label 2 Transparent base material 3 Thermal decoloring ink 3a Printing display 4 Adhesive layer 5 Release paper 6 Postcard 7 Transaction information 8 Address display items

Claims (5)

[Claims] 1. A concealing layer is provided on a surface side of a transparent substrate,
In a concealing label in which an adhesive layer and a release paper are sequentially provided on the back surface side of the transparent base material, the concealing layer is formed of a thermosensitive decoloring ink that decolorizes at a predetermined temperature or higher higher than normal temperature. Concealment label to feature. 2. The concealing label according to claim 1, wherein the heat-sensitive decolorable ink comprises an ink composition dispersed in a solvent, and the ink composition comprises a color former, a developer, and an erasing agent. Wherein the color-forming compound and the color developing agent interact with each other to form a color, and the erasing agent preferentially prefers one of the color developing compound and the color-forming compound when the ink composition is melted. A concealing label, which is an ink having a property of dissolving in water. 3. A mailing medium on which transmission information is displayed, wherein a concealing layer formed of a thermosensitive decoloring ink which decolors at a predetermined temperature higher than room temperature is provided on at least the transmission information. A mailing medium having a transparent substrate adhered thereto. 4. The mailing medium according to claim 3, wherein the transmission information is transaction information. 5. The concealing label or the mailing medium according to claim 1, wherein the concealing label or the mailing medium has a printed indication on the concealing layer using a thermosensitive decoloring ink having a hue different from the thermosensitive decoloring ink. Mailing medium.