JP6702774B2 - Concealment label - Google Patents

Description

The present invention relates to concealment labels.

A hidden information medium in which information that cannot be read in normal times is recorded on the medium has already spread widely in society and has become an important information transmission means indispensable in real life. Upon receiving such a hidden information medium, the receiver can obtain the information recorded on the medium by displaying the hidden information hidden by an appropriate means, and further, from the sender. It is possible to prevent the confidential information from being read by a third party until the hidden information medium is received.
An example of such a concealed information medium is a concealed postcard in which personal information is recorded on the surface of the postcard so that it cannot be read in normal times.

When such concealed information media are classified and exemplified from the viewpoint of the method of concealing information, the information to be concealed on the medium is covered with a concealment label which is a kind of removable label (removable label). , A hiding layer (see Patent Document 1), a hiding layer for hiding information on a medium is formed of a thermochromic ink, and the information is hidden by the hiding layer in normal times, and the hiding layer is erased by heating. An example is one in which concealment information is made visible by coloring (see Patent Document 2).

JP, 10-264559, A Japanese Patent Laid-Open No. 2000-043453

However, the concealment information medium disclosed in Patent Document 1 has a problem that the concealment label (removable label) needs to be re-peeled in order to obtain the concealment information, and the handling is complicated. In addition, in some cases, there is a problem that a problem occurs in the re-peel of the concealment label, a part of the concealment label is broken and remains on the information medium, and it becomes difficult to obtain the concealment information.
On the other hand, in the concealed information medium disclosed in Patent Document 2, when the concealed information is formed by a writing instrument that can be erased by heat such as frictional heat, this information is also erased when the hiding layer is erased. However, there is a problem in that the information cannot be acquired, that is, the method of recording the information is limited and the versatility is low.

The present invention has been made in view of the above circumstances, and in a concealment information medium configured by concealing information on a medium, it is possible to easily obtain concealment information and concealment with high versatility. The challenge is to provide a label.

In order to solve the above problems, the present invention comprises a pressure-sensitive adhesive layer on a paper base material, in the same region in the thickness direction of the paper base material on the paper base material , a colored component and Microcapsules are provided, and the microcapsules make the paper base material transparent or translucent, and also include a transparent decolorizing component for leading the decoloring of the colored component to JIS P. The air permeability of the paper base material measured according to 8117 is 1250 seconds or less, and the transparent decolorizing component is dibutyl adipate, 1-butoxy-2-propanol, diacetone alcohol or A covert label is provided, which is N-methylpyrrolidone .
The concealable label of the present invention may be one in which the colored component and the microcapsules are provided between the paper base material and the adhesive layer.

In the concealable label of the present invention, the adhesive layer may contain the microcapsules.
In the concealable label of the present invention, the pressure-sensitive adhesive layer may contain the colored component.
The concealment label of the present invention may be one in which the colored component and the microcapsules are provided on the side opposite to the side provided with the pressure-sensitive adhesive layer on the paper base material.

According to the present invention, it is possible to easily obtain concealment information in a concealment information medium configured to conceal information on a medium, and to provide a concealment label with high versatility.

It is sectional drawing which shows one Embodiment of the concealment label of this invention typically. It is a sectional view showing typically one embodiment of a concealment information medium constituted by sticking a concealment label of the present invention to an information medium. It is sectional drawing which shows other embodiment of the concealment label of this invention typically. It is sectional drawing which shows typically other embodiment of the concealment label of this invention. It is sectional drawing which shows typically other embodiment of the concealment label of this invention. It is sectional drawing which shows typically other embodiment of the concealment label of this invention. It is sectional drawing which shows typically other embodiment of the concealment label of this invention. It is sectional drawing which shows typically other embodiment of the concealment label of this invention. It is sectional drawing which shows typically other embodiment of the concealment label of this invention. It is sectional drawing which shows typically other embodiment of the concealment label of this invention.

<< concealment label >>
A concealment label according to an embodiment of the present invention comprises a pressure-sensitive adhesive layer on a paper base material, and a colored component in the same region on the paper base material in the thickness direction of the paper base material. And microcapsules are provided, wherein the microcapsules make the paper base material transparent or translucent, and include a transparent decolorizing component for leading the decoloring of the colored component. is there.
In the concealment label of the present invention, the colored component and the microcapsule are present at positions overlapping with each other, for example, in the thickness direction of the paper base material.

In addition, in the present specification, the term “microcapsule” means an aggregate of a plurality of microcapsules unless otherwise specified. Here, the aggregate of microcapsules includes, for example, an aggregate of many microcapsules such as several hundreds to tens of thousands.

The concealment label of the present invention is attached to an information medium so as to conceal information on the medium, and is used to form a concealed information medium. This concealment label enables acquisition of concealment information without removing it from the information medium after application, and simplifies the information acquisition process. Further, since this concealment label does not need to be removed from the information medium in this way, unlike the conventional concealment label, when it is removed, a part of it is broken and remains on the information medium, so that the concealment information can be obtained. Does not cause problems such as difficulty. Therefore, by using the concealment label of the present invention, the secret information recorded on the concealment information medium can be easily acquired. Further, by using the concealment label of the present invention, since the information to be concealed can be recorded on the medium by a usual method, there is no restriction on the information recording method, and further, the concealed information medium can be manufactured at low cost, The concealment label has high versatility.

In the present specification, hereinafter, simply “acquisition of information” means acquisition of information that is possible when the concealment label of the present invention is used, and examples thereof include visual observation, CCD camera, or An example of the acquisition of an optical image is the use of a scanner.

FIG. 1 is a sectional view schematically showing an embodiment of the concealing label of the present invention. It should be noted that, in the drawings used in the following description, in order to make the features of the present invention easy to understand, there are cases in which essential portions are enlarged for convenience, and the dimensional ratios of the respective components are the same as the actual ones. Not necessarily.

The concealment label 201 shown here comprises a colored layer 15 and a microcapsule-containing layer 22 between a paper base material 11 and an adhesive layer 13, and the microcapsule-containing layer 22 is a microcapsule (not shown). Is included.
That is, the concealment label 201 is formed by stacking the paper base material 11, the colored layer 15, the microcapsule-containing layer 22, and the adhesive layer 13 in this order in the thickness direction thereof.

The pressure-sensitive adhesive layer 13 is for attaching the concealment label 201 to a medium (information medium) to which the concealment label 201 is attached.
FIG. 2 is a cross-sectional view schematically showing an embodiment of a concealment information medium configured by attaching the concealment label of the present invention to the information medium. 2 and subsequent figures, the same components as those shown in the already-described figures are designated by the same reference numerals as those in the already-illustrated figures, and detailed description thereof will be omitted.

The hidden information medium 902 shown here is configured such that the area of the information medium 9 in which the information 90 is recorded is covered with the hidden label 201. In the concealment information medium 902, the concealment label 201 is attached and fixed to the surface of the information medium 9 on which the information 90 is recorded by the adhesive layer 13.

The constituent material and color of the information medium 9 may be appropriately selected according to the purpose and are not particularly limited.
Examples of preferable constituent materials of the information medium 9 include high quality paper, art paper, coated paper, cast coated paper, resin coated paper, synthetic paper and the like; polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl acetate, Acrylic resin, AS resin, ABS resin, polyamide, polyacetal, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyphenylene sulfide, polysulfone, polycarbonate, epoxy resin, melamine resin, phenol resin Synthetic resins such as urea resin, polyurethane, and polyimide.

When the constituent material of the information medium 9 is the synthetic resin, the surface of the information medium 9 to which the concealment label 201 is attached may be subjected to a surface treatment such as a mat treatment or a corona treatment.

The thickness of the information medium 9 is not particularly limited and may be appropriately selected depending on the purpose. For example, the thickness of the sheet-shaped information medium 9 as shown here is usually preferably 10 to 1000 μm, but this is an example.

The information medium 9 may be composed of one layer (single layer) or may be composed of two or more layers (plural layers are laminated). When the information medium 9 is composed of a plurality of layers, the plurality of layers may be the same as or different from each other, and the combination of the plurality of layers is not particularly limited as long as the effects of the present invention are not impaired.
In addition, in the present specification, not only in the case of the information medium, but “a plurality of layers may be the same or different from each other” means “all the layers may be the same or all the layers may be different”. May be present, only some of the layers may be the same", and "a plurality of layers are different from each other" means that "at least one of the constituent materials and the thickness of each layer is different from each other". Means
When the information medium 9 is composed of a plurality of layers, the total thickness of each layer may be the preferable thickness of the information medium 9 described above.

The information 90 recorded on the information medium 9 may be formed by a known method such as a printing layer formed by a normal ink, and is not particularly limited. For example, the constituent material of the information 90 may be opaque or the like as long as the existence of the information 90 can be recognized, and can be arbitrarily selected according to the purpose. For example, the color thereof is set in consideration of the color of the information medium 9. , Can be arbitrarily selected. The shape of the information 90 can also be arbitrarily selected according to the purpose, such as a character, a bar code, a QR code (registered trademark), an image, or the like. Thus, the use of the concealment label 201 has significant advantages over the use of conventional concealment labels in that there is no restriction on the formation of the information 90.

The thickness (height) of the information 90 recorded on the information medium 9 is not particularly limited and can be arbitrarily selected according to the constituent material and the purpose, but is preferably 0.01 to 200 μm, and 0 More preferably, it is 0.05 to 80 μm, and particularly preferably 0.1 to 5 μm.

The pressure-sensitive adhesive layer 13 is not particularly limited as long as it is transparent or translucent, and may be a known one used for sticking a label.
In the present specification, “transparent or semi-transparent” means having transparency to such an extent that an information hiding effect in a hidden information medium is not expressed, unless otherwise specified, for example, JIS K It means that the total light transmittance measured according to 7136 is 35% or more. And "opaque" means that this condition is not satisfied.

The adhesive layer 13 is configured to contain an adhesive component such as an adhesive resin, for example.
The adhesive strength of the pressure-sensitive adhesive component may be appropriately adjusted depending on the purpose, and the pressure-sensitive adhesive layer 13 may be removable or non-removable and may be permanently bonded. Here, “re-peelable” means that it can be peeled off without impairing the state of the bonding target surface.
The adhesive layer 13 does not have any problem even if it cannot be re-peeled to acquire the information 90, but if it can be re-peeled, it becomes possible to re-attach the concealment label 201 to the information medium 9, Handleability is improved. On the other hand, if the pressure-sensitive adhesive layer 13 cannot be removed again, for example, unintentional peeling of the concealment label 201 is highly suppressed during the transfer of the concealment information medium 902.

Although the thickness of the pressure-sensitive adhesive layer 13 is not particularly limited, it is preferably 1 to 400 μm, more preferably 1 to 150 μm, and particularly preferably 1 to 30 μm. When the thickness of the adhesive layer 13 is equal to or more than the lower limit value, the concealment label 201 can be more stably attached to the information medium 9. In addition, when the thickness of the pressure-sensitive adhesive layer 13 is equal to or less than the upper limit value, it is possible to prevent the pressure-sensitive adhesive layer 13 from having an excessive thickness, and, for example, the information 90 of the information 90 via the concealment label 201 as described below is used. It will be easier to obtain.

The pressure-sensitive adhesive layer 13 may be composed of one layer (single layer) or may be composed of two or more layers (a plurality of layers are laminated). When the pressure-sensitive adhesive layer 13 is composed of a plurality of layers, the plurality of layers may be the same as or different from each other, and the combination of the plurality of layers is not particularly limited as long as the effects of the present invention are not impaired.
When the pressure-sensitive adhesive layer 13 is composed of a plurality of layers, it is preferable that the total thickness of each layer be the preferable thickness of the pressure-sensitive adhesive layer 13.

The paper base material 11 is normally opaque, and is configured in the concealment label 201 so as to conceal the information 90 on the information medium 9 when the concealment information medium 902 is viewed from the paper base material 11 side. There is.
On the other hand, the paper base material 11 becomes transparent or semi-transparent by the permeation of a transparent decoloring component described later. In order to have such permeability of the transparent decolorizing component , it is preferable that the paper base material 11 has an air permeability of 1250 seconds or less, for example, measured according to JIS P8117.

Examples of the paper which is a constituent material of the paper base material 11 having the above-mentioned characteristics include high quality paper, art paper, coated paper, cast coated paper, resin coated paper, synthetic paper and the like.

The thickness of the paper base material 11 is not particularly limited, but is preferably 35 to 180 μm, and more preferably 50 to 150 μm. When the thickness of the paper base material 11 is equal to or more than the lower limit value, the effect of hiding the information 90 by the hiding label 101 becomes higher. In addition, when the thickness of the paper base material 11 is equal to or less than the upper limit value, it is possible to prevent the paper base material 11 from having an excessive thickness, and, for example, information through the concealment label 201 as described below. It becomes easier to acquire 90.

The paper base material 11 may be composed of one layer (single layer) or may be composed of two or more layers (a plurality of layers are laminated). When the paper base material 11 is composed of a plurality of layers, the plurality of layers may be the same as or different from each other, and the combination of the plurality of layers is not particularly limited as long as the effects of the present invention are not impaired. Further, when the paper base material 11 is composed of a plurality of layers, at least one of them may be opaque, and the other one or more layers may be transparent. When the paper base material 11 is composed of a plurality of layers, all layers may be opaque.
When the paper base material 11 is composed of a plurality of layers, it is preferable that the total thickness of each layer be the preferable thickness of the paper base material 11.

The colored layer 15 makes it difficult or difficult to acquire information on the information medium when the hidden information medium 902 is seen from the colored layer 15 side without the opaque paper base material 11 which is normally used. It is opaque to the extent that
That is, the concealment label 201 further improves the concealment effect of the information on the information medium 9.

The colored layer 15 contains a colored component for making it colored.
Examples of such a colored layer 15 include a layer containing a leuco dye in a colored state. The leuco dye may be a known leuco dye, and the leuco dye in a color-developed state is a leuco dye developed in a reaction with a developer.

The content of the colored components of the colored layer 15 is preferably 1 to 15 g / ^{m 2,} more preferably 3 to 5 g / ^{m 2.}

The thickness of the colored layer 15 is not particularly limited, but is preferably 0.1 to 30 μm, more preferably 1 to 10 μm. When the thickness of the colored layer 15 is equal to or more than the lower limit value, the effect of hiding the information 90 on the information medium 9 is further enhanced. Further, when the thickness of the colored layer 15 is equal to or less than the upper limit value, it is possible to prevent the colored layer 15 from having an excessive thickness, and for example, it becomes easier to obtain information via the concealment label 201.

The colored layer 15 may be composed of one layer (single layer) or may be composed of two or more layers (a plurality of layers are laminated). When the colored layer 15 includes a plurality of layers, the plurality of layers may be the same as or different from each other, and the combination of the plurality of layers is not particularly limited as long as the effects of the present invention are not impaired.
When the colored layer 15 is composed of a plurality of layers, it is preferable that the total thickness of the layers be the preferable thickness of the colored layer 15.

The microcapsule-containing layer 22 contains microcapsules (not shown) containing a transparent decoloring component, and is not particularly limited as long as it is transparent or translucent.
The microcapsules have a structure in which the film serving as the outer shell encloses the transparent decolorizing component, and thus the transparent decoloring component is included, and can be formed by a known method described later.

The microcapsules make the paper base material 11 transparent or semi-transparent and include a transparent decolorizing component for leading the decoloring of the colored component.
The transparent decolorizing component reaches the colored layer 15 to decolorize the colored layer 15 to make it transparent or translucent. For example, when the colored layer 15 is a layer containing the leuco dye, the transparent decolorizing component acts on the developer to change the leuco dye from the colored state to the decolorized state.
In the present specification, "decolorization of the colored layer" means not only that the colored layer becomes completely colorless, but also that the color layer has a tint to such an extent that the information hiding effect by the colored layer is eliminated. Also means that the colored layer becomes thin, and includes that the colored layer is in a state of having a substantial tint.

The transparent decolorizing component further penetrates into the paper base material 11 to improve the transparency of the paper base material 11 to make the paper base material 11 transparent or translucent.
In this way, the transparent decolorizing component acts on both the colored layer 15 and the paper base material 11.

The content of the microcapsules in the microcapsule-containing layer 22 varies depending on the thickness of the microcapsule-containing layer 22 (in other words, the coating amount of the microcapsule-containing composition described below), but is 1 to 20 g/m ^2. it is preferably, more preferably from 3 to 15 g / ^{m 2,} and particularly preferably 4~10g / ^{m 2.}
In addition, the content shown here is an example, and as long as the colored layer 15 is decolored by the above-described action, for example, in consideration of the thickness of the microcapsule-containing layer 22 and other conditions, The content of the microcapsules can be adjusted appropriately.

The microcapsule-containing layer 22 may consist of only microcapsules and an emulsifying material for microencapsulation, or may contain components other than microcapsules and emulsifiers such as a dispersion medium of microcapsules. Good.
The microcapsule dispersion medium may be a known one, and examples thereof include polyvinyl alcohol (PVA) and a hydrolyzate of styrene maleic anhydride.

In the present invention, the average particle size of one particle of the microcapsule is preferably 1 to 10 μm, regardless of the components contained therein. When the average particle size of the microcapsules is equal to or more than the lower limit value, the microcapsules can be easily destroyed in an appropriate range when the microcapsule-containing layer is pressed. Further, when the average particle size of the microcapsules is not more than the upper limit value, the stability of the microcapsules when the microcapsule-containing layer is not pressed is improved.
In the present specification, the “average particle diameter” means the median value D ₅₀ of the cumulative volume distribution measured by a method using a Coulter counter, unless otherwise specified.

When the concealment label 201 is pressed, the microcapsule-containing layer 22 is also pressed, and the pressure causes the transparent decoloring component to be released from the inside of the microcapsule to the outside, and the released transparent decoloring component reaches the colored layer 15. And further penetrates into the paper base material 11. Then, the paper base material 11, which is normally opaque and hides the information 90, becomes transparent or semitransparent by the action of the transparent decoloring component, and the colored layer 15 is further formed by the action of the transparent decolorizing component. Erase. As a result, the information 90 can be obtained via the hidden label 201 without removing the entire hidden label 201 or a part of the structure thereof from the information medium 9.

Further, when the concealment label 201 is strongly pressed, the paper base material 11 is crushed, whereby the surface roughness (surface roughness) of the paper base material 11 is reduced, and diffuse reflection of light on this surface is suppressed. At the same time, the thickness of the paper base material 11 is reduced, and as a result, the synergistic effect of improving the transparency of the paper base material 11 is obtained. As a result, the information 90 can be acquired more easily via the hidden label 201.

In the present specification, in the microcapsule-containing layer, the concealment label after the microcapsules release the inclusions also maintains the configuration including the paper base material, the adhesive layer and the microcapsule-containing layer. For the sake of convenience, it is referred to as a “concealed label”.

The transparent decolorizing component is not particularly limited as long as it has the above-mentioned properties, and specific examples thereof include polyethylene glycol, dibutyl adipate, 1-butoxy-2-propanol, diacetone alcohol. , Butyl acetate, ethylene glycol dimethyl ether, hexyl alcohol, cyclohexane, N-methylpyrrolidone and the like.

The transparent decolorizing component preferably has a boiling point of 250° C. or higher at room temperature and atmospheric pressure. Since the transparent decolorizing component having such a boiling point is hard to volatilize even after being released from the microcapsules, the concealed information is displayed on the concealed information medium 902 to which the concealed label 201 is attached. The longer you can maintain at.
In addition, in this specification, "normal temperature" means a temperature at which it is not particularly cooled or heated, that is, a normal temperature, and examples thereof include a temperature of 15 to 25°C.

The microcapsule-containing layer 22 includes, for example, in addition to the microcapsules containing the transparent decolorizing component, the microcapsules containing no decolorizing component and not containing the clearing component and the clearing component, and Either one or both of a microcapsule encapsulating an erasable component may be contained.
The clarification component is a component that permeates the paper base material 11 to improve the transparency of the paper base material 11 to make the paper base material 11 transparent or translucent.
The decolorizing component reaches the colored layer 15 to lead the decolorizing component to decolorize, thereby decolorizing the colored layer 15 to make it transparent or translucent.

The transparentizing component is preferably liquid, gel or cream at room temperature and atmospheric pressure.
The transparentizing component is preferably non-volatile and has a boiling point of 50° C. or higher.

Preferable clarification components include, for example, oily components (lipophilic components), and specific examples thereof include butyl adipate, 1-butoxy-2-propanol, butyl acetate, hexyl alcohol and the like. Be done.

For example, when the colored layer 15 is a layer containing the leuco dye, the decoloring component acts on the developer to change the leuco dye from the colored state to the decolorized state.
The decoloring component that decolorizes such a leuco dye may be a known one, and specifically, for example, an ester (a compound having an ester bond), a ketone (a compound having a carbonyl group), an ether (having an ether bond Compounds having a compound), aliphatic alcohols (aliphatic compounds having a hydroxyl group), amides (compounds having an amide bond), and the like.

The thickness of the microcapsule-containing layer 22 is not particularly limited, but is preferably 1 to 40 μm, more preferably 1 to 20 μm, and particularly preferably 1 to 10 μm. When the thickness of the microcapsule-containing layer 22 is not less than the lower limit value, it becomes easy for the microcapsule-containing layer 22 to contain a sufficient amount of microcapsules for exhibiting its function. Further, when the thickness of the microcapsule-containing layer 22 is equal to or less than the upper limit value, it is possible to prevent the microcapsule-containing layer 22 from having an excessive thickness. For example, when the concealment label 201 is pressed, The release of the transparent decolorizing component is facilitated, and the information 90 is more easily acquired via the concealment label 201.

The microcapsule-containing layer 22 may be composed of one layer (single layer) or may be composed of two or more layers (a plurality of layers are laminated). When the microcapsule-containing layer 22 is composed of a plurality of layers, the plurality of layers may be the same as or different from each other, and the combination of the plurality of layers is not particularly limited as long as the effects of the present invention are not impaired.
When the microcapsule-containing layer 22 is composed of a plurality of layers, the total thickness of each layer may be the preferable thickness of the microcapsule-containing layer 22 described above.

The concealment label 201 includes the pressure-sensitive adhesive layer 13 on the paper base material 11, and the colored component and the microcapsules are provided in the same area on the paper base material 11 in the thickness direction of the paper base material 11. It is provided.
In the concealment label 201, the colored component and the microcapsule are present at positions where they overlap each other in the thickness direction of the paper base material 11, for example.
The concealment label 201 contains the colored component and the microcapsules between the paper base material 11 and the adhesive layer 13.

When the concealment label 201 is attached to the information medium to form the concealment information medium, the information recorded on the information medium is covered with the concealment label 201 because the paper base material 11 is normally opaque. , Cannot be obtained because it is hidden. In addition, since the colored layer 15 is opaque in addition to the paper base material 11 at normal times, even if a problem occurs in the paper base material 11, the information recorded on the information medium cannot be obtained, and thus the information is kept secret. Highly effective.
On the other hand, when the microcapsule-containing layer 22 is pressed by pressing the concealment label 201, the transparent decolorizing component is released from the microcapsules therein, and the transparent decolorizing component reaches the colored layer 15. The colored layer 15 is erased and becomes transparent or semitransparent. Further, the transparent decolorization component penetrates into the paper base material 11, and the paper base material 11 becomes transparent or translucent. Therefore, it is possible to obtain the information that has been hidden until then through the hidden label 201 without removing the entire hidden label 201 or the structure of a part thereof from the information medium.

FIG. 3 is a sectional view schematically showing another embodiment of the concealing label of the present invention.
The concealment label 202 shown here is the same as the concealment label 201 shown in FIG. 1 except that the arrangement positions of the microcapsule-containing layer 22 and the colored layer 15 are opposite.
That is, the concealment label 202 is formed by stacking the paper base material 11, the microcapsule-containing layer 22, the colored layer 15, and the adhesive layer 13 in this order in the thickness direction thereof.

Similar to the concealment label 201, the concealment label 202 includes the pressure-sensitive adhesive layer 13 on the paper base material 11, and the same area in the thickness direction of the paper base material 11 on the paper base material 11, Colored components and microcapsules are provided.
In the concealment label 202, the colored component and the microcapsule are present at positions where they overlap each other in the thickness direction of the paper base material 11, for example.
The concealment label 202 contains the colored component and the microcapsules between the paper base material 11 and the adhesive layer 13.

When the concealment label 202 is used, due to the same action as when the concealment label 201 is used, in normal times, the information recorded on the information medium is concealed, the concealment label 202 is pressed, and the microcapsule-containing layer 22 is pressed. If so, the information can be acquired via the concealment label 202.

FIG. 4 is a sectional view schematically showing still another embodiment of the concealing label of the present invention.
The concealment label 203 shown here is provided with a pressure-sensitive adhesive layer 17 containing microcapsules (hereinafter referred to as “microcapsule-containing pressure-sensitive adhesive layer”) 17 instead of having the microcapsule-containing layer 22 and the pressure-sensitive adhesive layer 13. Except for the points, it is the same as the concealment label 201 shown in FIG.
That is, the concealment label 203 includes the paper base material 11, the colored layer 15, and the microcapsule-containing pressure-sensitive adhesive layer 17, and the color layer 15 includes the paper base material 11 and the microcapsule-containing pressure-sensitive adhesive layer. It is arranged between 17 and. In other words, the concealment label 203 is formed by stacking the paper base material 11, the colored layer 15, and the microcapsule-containing pressure-sensitive adhesive layer 17 in this order in the thickness direction.

The microcapsule-containing pressure-sensitive adhesive layer 17 can be configured, for example, such that the pressure-sensitive adhesive layer 13 in the concealment label 201 further contains the microcapsules in the concealment label 201. That is, the microcapsule-containing pressure-sensitive adhesive layer 17 contains microcapsules containing the transparent decoloring component in addition to the pressure-sensitive adhesive component.

The content of the microcapsules in the microcapsule-containing pressure-sensitive adhesive layer 17 is, for example, the content of the microcapsules in the microcapsule-containing layer 22 in consideration that the transparent decoloring component is absorbed by the pressure-sensitive adhesive component such as the pressure-sensitive adhesive resin. It is preferably more than Specifically, the content of the microcapsules of microcapsules containing pressure-sensitive adhesive layer 17 is preferably 1 to 30 g / ^{m 2,} more preferably from 4~20g / ^{m 2,} 7~15g / ^m Especially preferred is ² .

The thickness of the microcapsule-containing pressure-sensitive adhesive layer 17 is not particularly limited, but is preferably 1 to 250 μm, more preferably 2 to 70 μm, and particularly preferably 2 to 50 μm. When the thickness of the microcapsule-containing pressure-sensitive adhesive layer 17 is equal to or more than the above lower limit, the concealment label 203 can be more stably attached to the information medium, and the microcapsule-containing pressure-sensitive adhesive layer 17 exhibits its function. It becomes easy to contain a sufficient amount of microcapsules. Further, when the thickness of the microcapsule-containing pressure-sensitive adhesive layer 17 is equal to or less than the upper limit value, it is possible to prevent the microcapsule-containing pressure-sensitive adhesive layer 17 from having an excessive thickness, for example, when the concealment label 203 is pressed. The release of the transparent decolorization component of the microcapsule becomes easy, and the information acquisition via the concealment label 203 becomes easier.

The microcapsule-containing pressure-sensitive adhesive layer 17 may be composed of one layer (single layer) or may be composed of two or more layers (a plurality of layers are laminated). When the microcapsule-containing pressure-sensitive adhesive layer 17 is composed of a plurality of layers, the plurality of layers may be the same as or different from each other, and the combination of the plurality of layers is not particularly limited as long as the effect of the present invention is not impaired.
When the microcapsule-containing pressure-sensitive adhesive layer 17 is composed of a plurality of layers, the total thickness of each layer may be the preferable thickness of the microcapsule-containing pressure-sensitive adhesive layer 17 described above.

The paper base material 11 and the colored layer 15 in the concealment label 203 are the same as the paper base material 11 and the colored layer 15 in the concealment label 201.

The concealment label 203 is provided with the microcapsule-containing pressure-sensitive adhesive layer 17 on the paper base material 11, and the colored component and the micro component are provided in the same region on the paper base material 11 in the thickness direction of the paper base material 11. Capsules and are provided.

When the concealment label 203 is attached to the information medium to form the concealment information medium, the information recorded on the information medium is covered with the concealment label 203 because the paper base material 11 is normally opaque. , Cannot be obtained because it is hidden. In addition, since the colored layer 15 is opaque in addition to the paper base material 11 at normal times, even if a problem occurs in the paper base material 11, the information recorded on the information medium cannot be obtained, and thus the information is kept secret. Highly effective.
On the other hand, when the microcapsule-containing pressure-sensitive adhesive layer 17 is pressed by pressing the concealment label 203, the transparent decolorizing component is released from the microcapsules therein, and the transparent decolorizing component is transferred to the colored layer 15. Upon arrival, the colored layer 15 is erased and becomes transparent or translucent. Further, the transparent decolorization component penetrates into the paper base material 11, and the paper base material 11 becomes transparent or translucent. Therefore, it is possible to obtain the information that has been hidden until then through the hidden label 203, without removing the entire hidden label 203 or a part of the structure thereof from the information medium.

FIG. 5: is sectional drawing which shows typically other embodiment of the concealment label of this invention.
The concealment label 204 shown here is provided with a colored layer 16 containing microcapsules (hereinafter, referred to as “microcapsule-containing colored layer”) 16 instead of the microcapsule-containing layer 22 and the colored layer 15. 1 is the same as the concealment label 201 shown in FIG. The microcapsule-containing colored layer can also be referred to as a microcapsule-containing layer containing a colored component.
That is, the concealment label 204 includes the paper base material 11, the pressure-sensitive adhesive layer 13, and the microcapsule-containing colored layer 16, and the microcapsule-containing color layer 16 includes the paper base material 11 and the pressure-sensitive adhesive layer. It is arranged between 13 and. In other words, the concealment label 204 is formed by stacking the paper base material 11, the microcapsule-containing colored layer 16, and the adhesive layer 13 in this order in the thickness direction thereof.

The microcapsule-containing colored layer 16 contains a colored component such as a leuco dye in a colored state for coloring, as in the case of the colored layer 15 in the concealment label 201. Furthermore, the microcapsule-containing colored layer 16 contains microcapsules that decolorize itself and include a transparent decolorizing component for making the paper base material 11 transparent or translucent.

When the concealment label 204 is affixed to the information medium to form the concealment information medium, the microcapsule-containing colored layer 16 has the microcapsule-containing colored layer 16 side even without the opaque paper base material 11 in the normal state. It is opaque to the extent that it makes impossible or difficult to obtain information on the information medium when looking at the hidden information medium from there.
That is, the concealment label 204 further improves the concealment effect of the information on the information medium.

The content of the microcapsules in the microcapsule-containing colored layer 16 is the same as the content of the microcapsules in the microcapsule-containing layer 22 described above.
The content of the color component of the microcapsule-containing color layer 16 is the same as the content of the color component of the color layer 15 described above.

The thickness of the microcapsule-containing colored layer 16 is not particularly limited, but is preferably 1 to 100 μm, more preferably 1 to 35 μm, and particularly preferably 4 to 20 μm. When the thickness of the microcapsule-containing colored layer 16 is equal to or more than the lower limit value, the effect of hiding information on the medium is further enhanced, and the amount of the microcapsule-containing colored layer 16 sufficient to exhibit its function is achieved. It becomes easy to contain microcapsules. Further, when the thickness of the microcapsule-containing colored layer 16 is equal to or less than the upper limit value, it is possible to prevent the microcapsule-containing colored layer 16 from having an excessive thickness. For example, when the hiding label 204 is pressed, the microcapsule The release of the transparent decolorizing component of the capsule is facilitated and the information is more easily obtained via the concealment label 204.

The microcapsule-containing colored layer 16 may be composed of one layer (single layer) or may be composed of two or more layers (a plurality of layers are laminated). When the microcapsule-containing colored layer 16 is composed of a plurality of layers, the plurality of layers may be the same as or different from each other, and the combination of the plurality of layers is not particularly limited as long as the effects of the present invention are not impaired.
When the microcapsule-containing colored layer 16 is composed of a plurality of layers, it is preferable that the total thickness of each layer be the preferable thickness of the microcapsule-containing colored layer 16.

The paper base material 11 and the adhesive layer 13 in the concealment label 204 are the same as the paper base material 11 and the adhesive layer 13 in the concealment label 201.

The concealment label 204 includes the pressure-sensitive adhesive layer 13 on the paper base material 11, and the colored component and the microcapsules are provided on the paper base material 11 in the same region in the thickness direction of the paper base material 11. It is provided.

When the concealment label 204 is attached to the information medium to form the concealment information medium, the information recorded on the information medium is covered with the concealment label 204 because the paper base material 11 is normally opaque. , Cannot be obtained because it is hidden. In addition, since the microcapsule-containing colored layer 16 is opaque in addition to the paper base material 11 in normal times, even if a problem occurs in the paper base material 11, the information recorded on the information medium cannot be obtained. , High information concealment effect.
On the other hand, when the microcapsule-containing colored layer 16 is pressed by pressing the concealment label 204, the transparent decolorizing component is released from the microcapsules therein, and the action of the transparent decolorizing component causes the microcapsules to operate. The contained colored layer 16 itself is decolorized and becomes transparent or translucent. Further, the transparent decolorization component penetrates into the paper base material 11, and the paper base material 11 becomes transparent or translucent. Therefore, it is possible to obtain the information that has been hidden until then through the hidden label 204 without removing the entire hidden label 204 or the structure of a part thereof from the information medium.

FIG. 6 is a sectional view schematically showing still another embodiment of the concealing label of the present invention.
The concealment label 205 shown here includes a pressure-sensitive adhesive layer 23 (hereinafter, referred to as “colored pressure-sensitive adhesive layer”) 23 containing a colored component instead of having the pressure-sensitive adhesive layer 13 and the colored layer 15, It is the same as the concealment label 202 shown in FIG.
That is, the concealment label 205 includes the paper base 11, the colored adhesive layer 23, and the microcapsule-containing layer 22, and the microcapsule-containing layer 22 includes the paper base 11 and the colored adhesive layer. It is arranged between 23 and. In other words, the concealment label 205 is formed by stacking the paper base material 11, the microcapsule-containing layer 22, and the colored adhesive layer 23 in this order in the thickness direction thereof.

The colored pressure-sensitive adhesive layer 23 can be configured such that the pressure-sensitive adhesive layer 13 in the concealment label 201 further contains a colored component in the concealment label 201 (for example, a leuco dye in a colored state).

When the concealment label 205 is attached to the information medium to form the concealment information medium, the colored pressure-sensitive adhesive layer 23 is concealed from the microcapsule-containing layer 22 side even without the opaque paper base material 11 which is normally used. It is opaque to the extent that it makes the acquisition of information on the information medium impossible or difficult when looking at the information medium.
That is, the concealment label 205 further improves the concealment effect of the information on the information medium.

The content of the colored component of the colored adhesive layer 23 is the same as the content of the colored component of the colored layer 15 described above.

The thickness of the colored adhesive layer 23 is not particularly limited, but is preferably 1 to 200 μm, more preferably 1 to 30 μm. When the thickness of the colored pressure-sensitive adhesive layer 23 is equal to or more than the lower limit value, the concealment label 205 can be more stably attached to the information medium, and the effect of concealing the information on the medium becomes higher. Further, when the thickness of the colored adhesive layer 23 is equal to or less than the upper limit value, it is possible to prevent the colored adhesive layer 23 from having an excessive thickness, and it is easier to obtain information through the concealment label 205, for example. Becomes

The colored adhesive layer 23 may be composed of one layer (single layer) or may be composed of two or more layers (a plurality of layers are laminated). When the colored pressure-sensitive adhesive layer 23 is composed of a plurality of layers, the plurality of layers may be the same as or different from each other, and the combination of the plurality of layers is not particularly limited as long as the effect of the present invention is not impaired.
When the colored pressure-sensitive adhesive layer 23 is composed of a plurality of layers, the total thickness of each layer may be the preferable thickness of the colored pressure-sensitive adhesive layer 23.

The paper base material 11 and the microcapsule-containing layer 22 in the concealment label 205 are the same as the paper base material 11 and the microcapsule-containing layer 22 in the concealment label 201.

The concealment label 205 includes the colored adhesive layer 23 on the paper base material 11, and the colored component and the microcapsules are provided in the same region on the paper base material 11 in the thickness direction of the paper base material 11. Is provided.

When the concealment label 205 is attached to the information medium to form the concealment information medium, the information recorded on the information medium is covered with the concealment label 205 because the paper base material 11 is normally opaque. , Cannot be obtained because it is hidden. In addition, since the colored pressure-sensitive adhesive layer 23 is opaque in addition to the paper base material 11 in normal times, even if a problem occurs in the paper base material 11, the information recorded on the information medium cannot be obtained. Highly effective for concealing information.
On the other hand, when the microcapsule-containing layer 22 is pressed by pressing the concealment label 205, the transparent decolorizing component is released from the microcapsules therein, and the transparent decolorizing component is transferred to the colored adhesive layer 23. Upon arrival, the colored adhesive layer 23 is decolorized and becomes transparent or semitransparent. Further, the transparent decolorization component penetrates into the paper base material 11, and the paper base material 11 becomes transparent or translucent. Therefore, it is possible to obtain the information that has been hidden until then through the hidden label 205 without removing the entire hidden label 205 or a part of the hidden label 205 from the information medium.

FIG. 7 is a sectional view schematically showing still another embodiment of the concealing label of the present invention.
The concealment label 302 shown here includes a paper base material 11, an adhesive layer 13, and a microcapsule-containing layer 22, and a colored layer 15 is further provided on the microcapsule-containing layer 22 side of the paper base material 11. Be prepared.
The concealment label 302 includes the colored layer 15 on the microcapsule-containing layer 22.
That is, the concealment label 302 is formed by stacking the colored layer 15, the microcapsule-containing layer 22, the paper base material 11, and the adhesive layer 13 in this order in the thickness direction thereof.

When the concealment label 302 is attached to the information medium to form the concealment information medium, the colored layer 15 can be viewed from the side of the colored layer 15 without the opaque paper base material 11 which is normally used. It is opaque to the extent that it makes impossible or difficult to obtain information on the information medium.
That is, the concealment label 302 further improves the concealment effect of the information on the information medium.

The paper base material 11, the adhesive layer 13, the colored layer 15 and the microcapsule containing layer 22 in the concealment label 302 are the paper base material 11, the adhesive layer 13, the colored layer 15 and the microcapsule containing layer 22 in the concealment label 201. Is the same as.

When the concealment label 302 is attached to the information medium to form the concealment information medium, the information recorded on the information medium is covered with the concealment label 302 because the paper base material 11 is normally opaque. , Cannot be obtained because it is hidden. In addition, since the colored layer 15 is opaque in addition to the paper base material 11 at normal times, even if a problem occurs in the paper base material 11, the information recorded on the information medium cannot be obtained, and thus the information is kept secret. Highly effective.
On the other hand, when the microcapsule-containing layer 22 is pressed by pressing the concealment label 302, the transparent decolorizing component is released from the microcapsules therein, and the transparent decolorizing component reaches the colored layer 15. The colored layer 15 is erased and becomes transparent or semitransparent. Further, the transparent decolorization component penetrates into the paper base material 11, and the paper base material 11 becomes transparent or translucent. Therefore, it is possible to obtain the information that has been hidden until then through the hidden label 302 without removing the entire hidden label 302 or a part of the hidden label 302 from the information medium.

The concealment label 302 includes the pressure-sensitive adhesive layer 13 on the paper base material 11, and the colored component and the microcapsules are provided on the paper base material 11 in the same region in the thickness direction of the paper base material 11. It is provided.
In the concealment label 302, the colored component and the microcapsule are present at positions where they overlap each other in the thickness direction of the paper base material 11, for example.
The concealment label 302 is provided with a colored component and microcapsules on the side of the paper base material 11 opposite to the side having the adhesive layer 13.

FIG. 8 is a sectional view schematically showing still another embodiment of the concealing label of the present invention.
The concealment label 303 shown here is the same as the concealment label 302 shown in FIG. 7 except that the arrangement positions of the microcapsule-containing layer 22 and the colored layer 15 are opposite.
That is, the concealment label 303 is formed by laminating the microcapsule-containing layer 22, the colored layer 15, the paper base material 11, and the adhesive layer 13 in this order in the thickness direction thereof.

Similar to the concealment label 302, the concealment label 303 includes a pressure-sensitive adhesive layer 13 on the paper base material 11, and the same area in the thickness direction of the paper base material 11 on the paper base material 11, Colored components and microcapsules are provided.
In the concealment label 303, the colored component and the microcapsule are present at positions where they overlap each other in the thickness direction of the paper base material 11, for example.
The concealment label 303 has a colored component and microcapsules provided on the side of the paper base material 11 opposite to the side having the adhesive layer 13.

When the concealment label 303 is used, due to the same action as when the concealment label 302 is used, in normal times, the information recorded on the information medium is concealed, the concealment label 303 is pressed, and the microcapsule-containing layer 22 is pressed. If so, the information can be acquired through the hidden label 303.

FIG. 9 is a sectional view schematically showing still another embodiment of the concealing label of the present invention.
The concealment label 304 shown here is the same as the concealment label 204 shown in FIG. 5 except that the arrangement positions of the microcapsule-containing colored layer 16 and the paper base material 11 are opposite.
That is, the concealment label 304 includes the microcapsule-containing colored layer 16, the paper base material 11, and the adhesive layer 13, and the paper base material 11 includes the microcapsule-containing colored layer 16 and the adhesive layer. It is arranged between 13 and. In other words, the concealment label 304 is formed by stacking the microcapsule-containing colored layer 16, the paper base material 11, and the adhesive layer 13 in this order in the thickness direction thereof.

Similar to the concealment label 302, the concealment label 304 includes the pressure-sensitive adhesive layer 13 on the paper base material 11, and the same area in the thickness direction of the paper base material 11 on the paper base material 11, Colored components and microcapsules are provided.
In the concealment label 304, the colored component and the microcapsule are present at positions where they overlap each other in the thickness direction of the paper base material 11, for example.
Further, the concealment label 304 is one in which a colored component and microcapsules are provided on the paper base material 11 on the side opposite to the side provided with the adhesive layer 13.

When the concealment label 304 is used, due to the same action as when the concealment label 301 is used, in normal times, the information recorded on the information medium is concealed, the concealment label 304 is pressed, and the microcapsule-containing colored layer 16 is When pressed, information can be acquired via the concealment label 304.

FIG. 10 is a sectional view schematically showing still another embodiment of the concealing label of the present invention.
The concealment label 401 shown here is not provided with the pressure-sensitive adhesive layer 13, the microcapsule-containing layer 22 and the colored layer 15, but is a pressure-sensitive adhesive layer containing microcapsules and a colored component (hereinafter, “microcapsule-containing colored pressure-sensitive adhesive”). The hiding label 201 is the same as the hiding label 201 shown in FIG.
That is, the concealment label 401 includes the paper base material 11 and the microcapsule-containing colored adhesive layer 33. In other words, the concealment label 401 is formed by stacking the paper base material 11 and the microcapsule-containing colored adhesive layer 33 in the thickness direction thereof.

The microcapsule-containing colored pressure-sensitive adhesive layer 33 is configured such that, for example, the pressure-sensitive adhesive layer 13 in the concealment label 201 further contains microcapsules and a colored component (for example, a leuco dye in a colored state) in the concealment label 201. Can be configured.

When the concealment label 401 is attached to the information medium to form the concealment information medium, the microcapsule-containing colored pressure-sensitive adhesive layer 33 has the microcapsule-containing color-adhesive layer without the opaque paper base material 11 in the normal state. When the hidden information medium is viewed from the agent layer 33 side, it is opaque to the extent that it makes acquisition of information on the information medium impossible or difficult.
That is, the concealment label 401 further improves the concealment effect of the information on the information medium.

The content of the microcapsules in the microcapsule-containing colored adhesive layer 33 is preferably 1 to 30 g / ^{m 2,} more preferably 3 to 15 g / ^{m 2.}
The content of the colored component of microcapsules containing colored adhesive layer 33 is preferably 0.1 to 30 g / ^{m 2,} more preferably 1 to 10 g / ^{m 2.}

The thickness of the microcapsule-containing colored adhesive layer 33 is not particularly limited, but is preferably 1 to 400 μm, more preferably 1 to 150 μm, and particularly preferably 1 to 60 μm. When the thickness of the microcapsule-containing colored pressure-sensitive adhesive layer 33 is equal to or more than the lower limit value, the concealment label 401 can be more stably attached to the information medium, and the microcapsule-containing colored pressure-sensitive adhesive layer 33 exhibits its function. Therefore, it becomes easy to contain a sufficient amount of microcapsules, and the effect of hiding information on the medium is further enhanced. Further, the thickness of the microcapsule-containing colored pressure-sensitive adhesive layer 33 is equal to or less than the upper limit value, so that the microcapsule-containing colored pressure-sensitive adhesive layer 33 is prevented from having an excessive thickness, and for example, the concealment label 401 is pressed. At times, the transparent decolorization component of the microcapsules may be easily released, and thus it becomes easier to obtain information via the concealment label 401.

The microcapsule-containing colored pressure-sensitive adhesive layer 33 may be composed of one layer (single layer) or may be composed of two or more layers (a plurality of layers are laminated). When the microcapsule-containing colored pressure-sensitive adhesive layer 33 is composed of a plurality of layers, the plurality of layers may be the same or different from each other, and the combination of the plurality of layers is not particularly limited as long as the effect of the present invention is not impaired.
When the microcapsule-containing colored pressure-sensitive adhesive layer 33 is composed of a plurality of layers, it is preferable that the total thickness of each layer is the preferable thickness of the microcapsule-containing colored pressure-sensitive adhesive layer 33.

The paper base material 11 in the concealment label 401 is the same as the paper base material 11 in the concealment label 201.

The concealment label 401 is provided with the microcapsule-containing colored adhesive layer 33 on the paper base material 11, and in the same region in the thickness direction of the paper base material 11 on the paper base material 11, a colored component and And microcapsules.

When the concealment label 401 is attached to the information medium to form the concealment information medium, the information recorded on the information medium is covered with the concealment label 401 because the paper base material 11 is normally opaque. , Cannot be obtained because it is hidden. In addition, in normal times, the microcapsule-containing colored pressure-sensitive adhesive layer 33 is opaque in addition to the paper base material 11, so that even if a problem occurs in the paper base material 11, the information recorded on the information medium is acquired. Because it is not possible, the information concealment effect is high.
On the other hand, when the microcapsule-containing colored pressure-sensitive adhesive layer 33 is pressed by pressing the concealment label 401, the transparent decolorizing component is released from the microcapsules therein, and by the action of the transparent decoloring component, The microcapsule-containing colored pressure-sensitive adhesive layer 33 itself is decolorized and becomes transparent or translucent. Further, the transparent decolorization component penetrates into the paper base material 11, and the paper base material 11 becomes transparent or translucent. Therefore, it is possible to obtain the information that has been concealed until then through the concealment label 401 without removing the entire concealment label 401 or a part of the structure thereof from the information medium.

The concealment label of the present invention is not limited to those shown in FIGS. 1 to 10, and for example, within the range that does not impair the effects of the present invention, some of the configurations shown in FIGS. Alternatively, it may be added.

For example, up to this point, as a concealment label, one provided with a paper base material, a pressure-sensitive adhesive layer, a microcapsule-containing layer and a colored layer, or a microcapsule-containing pressure-sensitive adhesive layer instead of the pressure-sensitive adhesive layer and the microcapsule-containing layer. Those having a microcapsule-containing colored layer in place of the colored layer and the microcapsule-containing layer, those having a colored adhesive layer in place of the pressure-sensitive adhesive layer and the colored layer, these adhesives The thing provided with the microcapsule containing colored adhesive layer instead of the agent layer, the microcapsule containing layer, and the colored layer was demonstrated. The hiding label of the present invention may be provided with another layer that does not correspond to any of these layers, and the coordination position of the other layer can be arbitrarily selected according to the purpose.
However, from the viewpoint that the effect of the present invention is more remarkably obtained, it is preferable that the hiding label of the present invention does not include the other layer.

<<Hidden Label Manufacturing Method>>
The concealment label of the present invention can be produced by laminating the layers constituting the concealment label so that the layers are arranged at suitable positions.
For example, the concealment label 201 shown in FIG. 1 can be manufactured by laminating the paper base material 11, the colored layer 15, the microcapsule-containing layer 22, and the adhesive layer 13 in this order in the thickness direction thereof.

The microcapsule-containing layer can be formed by a known method. For example, in the presence of the transparent decolorizing component serving as a core substance, a film serving as an outer shell is formed by a film-forming component to prepare microcapsule particles encapsulating the core substance and containing the microcapsule. The microcapsule-containing layer can be formed by applying a microcapsule-containing composition such as a dispersion liquid to a desired portion and drying the composition.

The microcapsules containing the transparent decolorizing component can be produced by, for example, a chemical method, a physicochemical method, a physical and mechanical method, or the like.

Among the methods for producing microcapsules, examples of the chemical method include a method of producing a film-forming component by an interfacial polymerization method, an in situ polymerization method, a submerged curing coating method, and the like, and encapsulating the same.

Examples of the interfacial polymerization method include a method of interfacially polymerizing a polybasic acid halide and a polyol to form a film of polyester, and a method of interfacially polymerizing a polybasic acid halide and a polyamine to form a film of polyamide. A method of interfacially polymerizing polyisocyanate and polyol to form a film made of polyurethane, a method of interfacially polymerizing polyisocyanate and polyamine to form a film made of polyurea, and the like.

Examples of the in situ polymerization method include a film made of a copolymer of one kind selected from melamine and urea, formalin or an initial polycondensate thereof, and a partial hydrolyzate of a styrene maleic anhydride copolymer. Forming method, method of copolymerizing styrene and divinylbenzene to form a film of a polystyrene copolymer, and copolymerization of methyl methacrylate and n-butyl methacrylate to form a film of a polymethacrylate copolymer. Methods and the like.

Examples of the in-liquid hardening coating method include a method of hardening gelatin, polyvinyl alcohol, an epoxy resin, sodium alginate, or the like in a liquid.

Among the methods for producing microcapsules, physicochemical methods include, for example, a simple coacervation method; a complex coacervation method; a pH control method; a phase separation method from an aqueous solution such as a nonsolvent addition method; and an organic solvent method. And the coacervation method such as the phase separation method. Examples of the film forming component used in these physicochemical methods include gelatin, cellulose, gelatin-gum arabic and the like.
Further, examples of the physicochemical method include an interfacial sedimentation method using polystyrene and the like.

Among the methods of microencapsulation, examples of physical and mechanical methods include spray drying method, air suspension coating method, vacuum deposition coating method, electrostatic coalescence method, melt dispersion cooling method, and inorganic wall encapsulation method. Etc. Examples of the film-forming component used in these physical and mechanical methods include gelatin, gum arabic, polyvinylpyrrolidone, carboxymethyl cellulose, methyl cellulose, sodium alginate and the like.

The thickness of the microcapsule-containing layer can be adjusted, for example, by adjusting the coating amount of the microcapsule-containing composition or the content of microcapsules of the microcapsule-containing composition used for coating.

The pressure-sensitive adhesive layer can be formed by a known method. For example, the pressure-sensitive adhesive layer can be formed by using a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive component such as a pressure-sensitive adhesive resin, applying this to a desired location, and drying.
The thickness of the pressure-sensitive adhesive layer can be adjusted, for example, by adjusting the coating amount of the pressure-sensitive adhesive composition or the content of the pressure-sensitive adhesive component of the pressure-sensitive adhesive composition used for coating.

The colored layer can be formed by a known method, and for example, it can be formed by the same method as in the case of the pressure-sensitive adhesive layer except that the contained components are different. That is, for example, in the case where the colored component is a leuco dye in a colored state, a colored composition containing a leuco dye and a developer is used, and the composition is applied to a target area and dried. Thus, the colored layer can be formed.
The thickness of the colored layer can be adjusted, for example, by adjusting the coating amount of the colored composition or the content of the colored component of the colored composition used for coating.

The microcapsule-containing pressure-sensitive adhesive layer is, for example, a mixture of the pressure-sensitive adhesive composition and the microcapsule-containing composition, and a microcapsule-containing pressure-sensitive adhesive composition containing both a pressure-sensitive adhesive component and microcapsules is used. It can be formed by applying to a target area and drying.
The thickness of the microcapsule-containing pressure-sensitive adhesive layer controls, for example, the coating amount of the microcapsule-containing pressure-sensitive adhesive composition, the content of the microcapsules or the pressure-sensitive adhesive component of the microcapsule-containing pressure-sensitive adhesive composition used for coating, and the like. It can be adjusted.

The microcapsule-containing colored layer is, for example, a microcapsule-containing colored composition obtained by further mixing a colorant component with the microcapsule-containing composition, and the composition is applied to a desired location and dried. It can be formed.
The thickness of the microcapsule-containing colored layer is, for example, by adjusting the coating amount of the microcapsule-containing colored composition, the content of the microcapsule or the colored component of the microcapsule-containing colored composition used for coating, Can be adjusted.

The colored pressure-sensitive adhesive layer can be formed, for example, by using the colored pressure-sensitive adhesive composition containing the pressure-sensitive adhesive component and the colorant component, applying the composition to a desired position, and drying the composition.
The thickness of the colored pressure-sensitive adhesive layer can be adjusted, for example, by adjusting the coating amount of the colored pressure-sensitive adhesive composition, the content of the adhesive component or the colored component of the colored pressure-sensitive adhesive composition used for coating, and the like.

The microcapsule-containing colored adhesive layer is, for example, a mixture of the colored adhesive composition and the microcapsule-containing composition, and a microcapsule-containing adhesive composition containing both an adhesive component and microcapsules is used. It can be formed by applying this to the intended place and drying. However, this method is an example.
The thickness of the microcapsule-containing colored adhesive layer, for example, the coating amount of the microcapsule-containing colored adhesive layer, the content of the microcapsules or adhesive components of the microcapsule-containing colored adhesive layer used for coating, etc. You can adjust it.

As described above, each layer other than the paper base material is not limited to the layers described so far, and each of them uses various compositions containing components necessary for the constitution of the layer, and it is applied to a place where this is intended. It can be formed by coating and drying, and the thickness of each layer can be adjusted by adjusting the coating amount of the composition or the content of the components contained in the composition used for coating.

Further, each layer other than the paper base material may be directly formed by applying the composition to a portion to be laminated and drying the composition. For example, the composition may be formed on a release-treated surface of a release film. Alternatively, the layer may be formed by applying and drying, and then transferring a layer formed in advance to a place to be laminated and transferring the layer.

<<How to use the concealed label>>
The concealment label of the present invention can be used for producing a concealment information medium and for obtaining concealment information from the produced concealment information medium.
That is, in the information medium in which the information to be concealed is recorded, the concealment label of the present invention is attached to the area in which the information is recorded by the adhesive layer to conceal the information, thereby concealing the information medium. Can be produced. No special method is required for recording information, and a known method having general versatility can be adopted.
On the other hand, with respect to the produced concealment information medium, the concealment label is pressed to make the paper base material transparent or semi-transparent, and the colored layer is decolorized, thereby the whole or part of the structure of the concealment label. Even if it is not removed from the information medium, the concealed information can be acquired via the concealment label.
Thus, by using the concealment label of the present invention, there are no restrictions on the information recording method, the concealment information medium can be manufactured at low cost, and the versatility is high. Further, unlike the conventional concealment label, the operation of removing the concealment label is not required, and the handling is easy. Further, there is no problem in obtaining secret information because a problem occurs when removing the concealment label and a part of the concealment label is broken and remains on the information medium.

INDUSTRIAL APPLICATION This invention can be utilized for acquisition of concealment information from the concealment information medium in which the information on a medium, such as a concealed postcard, is concealed.

201, 202, 203, 204, 205, 302, 303, 304, 401... Concealment label, 11... Paper base material, 22... Microcapsule-containing layer, 13... Adhesive layer, 17 ... Microcapsule-containing adhesive layer, 15... Colored layer, 16... Microcapsule-containing colored layer, 23... Colored adhesive layer, Microcapsule-containing colored adhesive layer 33

Claims (5)

An adhesive layer is provided on a paper base material,
On the paper base material, in the same region in the thickness direction of the paper base material, a colored component and microcapsules are provided,
The microcapsules make the paper base material transparent or semi-transparent, and include a transparent decolorizing component for leading the colored component to decolorization ,
The air permeability of the paper base material measured in accordance with JIS P 8117 is 1250 seconds or less,
A concealable label, wherein the transparent decolorizing component is dibutyl adipate, 1-butoxy-2-propanol, diacetone alcohol or N-methylpyrrolidone . The concealment label according to claim 1, wherein the colored component and the microcapsules are provided between the paper base material and the adhesive layer. The concealment label according to claim 1, wherein the adhesive layer contains the microcapsules. The concealment label according to claim 1, wherein the pressure-sensitive adhesive layer contains the colored component. The concealment label according to claim 1, wherein the colored component and the microcapsules are provided on a side of the paper base material opposite to a side provided with the adhesive layer.

Images