JP2002019284A - Antifalsifying pressure sensitive reproducing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the easy confirmation of the absence and presence of a falsification in an antifalsifying pressure sensitive reproducing sheet employing together with a back carbon. SOLUTION: A transfer sheet 2 and an accepting sheet 3 are piled up under the state that a developer layer is provided at the important positions in the opposing surface of a transfer sheet 2 and a mixing layer 6 produced by mixing a back carbon ink and a developer is provided at the accepting sheet 2 side of the developer layer 5. At the predetermined region opposing at least to the mixing layer 6 in the opposing surface of the accepting sheet 3, a coloring agent microcapsule layer 7 including a coloring agent developing color different from the color developed in the back carbon ink is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a falsification-preventing pressure-sensitive copying sheet using back carbon, which can easily detect tampering due to falsification in a pressure-sensitive copying sheet using back carbon. .

[0002]

In general, as a copy form, the use of carbonless paper is predominant, but the use of back carbon paper is still required due to the sequelae of the toxicity problem of PCB drugs. And its demand is high. As described above, the back carbon type pressure-sensitive copying sheet which is often used at present is, for example, a transfer sheet Q having a back carbon ink layer P provided at a key portion on the opposite surface side as shown in FIG. A representative example is a configuration in which a corresponding receiving sheet R is stapled S at one end.

However, in the above-mentioned conventional back-carbon type pressure-sensitive copying sheet, the transfer sheet Q to be managed and the receiving sheet R to be handed down to a customer or the like are separated, and the transfer sheet Q and the receiving sheet R are separated. Even if the content is individually tampered with, the problem is that there is no verification method from the transfer sheet to be collected and managed. That is, the applicant (artist) separates the transfer sheet Q and the receiving sheet R of the pressure-sensitive copying sheet, and as shown in FIG. 5B, the transfer sheet Q and another receiving sheet R1 prepared by the applicant fraudulently. In addition, the description A is entered in the transfer sheet Q, and the transfer sheet Q having the description A is submitted to the management department or the like, and further, as shown in FIG. Using another transfer sheet Q1 having the back carbon ink layer P, a different entry B is copied and entered into the regular receiving sheet R and submitted to the acceptor. In this case, a fraud problem occurs because there is a difference between the item B on the receiving sheet R held by the acceptor and the item A described on the transfer sheet Q managed by the management department or the like. In these cases, if the falsification of the applicant is skillful, it is difficult to determine whether the items described on the transfer sheet are true or false.

In order to prevent such tampering by easily detecting such tampering, the inventor of the present invention has previously described a falsification-preventing pressure-sensitive copying sheet using back carbon. A color former and a back carbon layer are sequentially laminated on the receiving sheet side facing surface of the sheet, and a color former microcapsule layer containing a color former that develops a color different from the back carbon ink on the receiving sheet side facing surface of the receiving sheet. Has been proposed. In this pressure-sensitive copying sheet, copying to the front side of the receiving sheet due to the transfer of the back carbon ink and copying to the back side of the transfer sheet due to the transfer of the coloring agent are performed simultaneously only during regular use. Things. That is, the presence or absence of tampering can be determined by checking the copy on the back side of the transfer sheet. And, in the present invention, when writing, the back carbon ink corresponding to the writing location is not all transferred to the receiving sheet side,
Focusing on the point that the color slightly remains on the color developer layer side, the back carbon ink remaining on the color developer layer side is used to make such copying on the back side of the transfer sheet clearer. It is an object of the present invention to make it easier to confirm a copied image.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and is a pressure-sensitive copying sheet in which a transfer sheet and a receiving sheet are overlapped with each other. And a mixed layer formed by mixing the back carbon ink and the color developer on the receiving sheet side of the color developing layer, and a predetermined layer facing at least the mixed layer on the opposing surface of the receiving sheet. The present invention solves the above-mentioned problems by providing a falsification-preventing pressure-sensitive copying sheet, in which a region is provided with a color former microcapsule layer containing a color former that develops a color different from the back carbon ink. is there. In the present invention, it is preferable that a hard layer formed by applying an undercoat agent is further provided between the color former microcapsule layer and the receiving sheet.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the embodiments shown in FIGS. First, in FIG. 1, reference numeral 1 denotes a falsification-preventing pressure-sensitive copying sheet. The pressure-sensitive copying sheet 1 is a sheet in which a transfer sheet 2 and a receiving sheet 3 are overlapped and bound at one end 4. It is. An entry field (not shown) is provided on the surface of the transfer sheet 2. The receiving sheet 3 of the transfer sheet 2
The developer layer 5 and the mixed layer 6 are laminated in order from the transfer sheet 2 side in the area corresponding to the entry column on the surface facing the above, and the mixed layer 6 is a mixture of the developer and the back carbon ink. It is made. On the other hand, receiving sheet 3
On the surface facing the transfer sheet 2, the transfer sheet 3 is provided at least in a predetermined area facing the mixed layer 6.
A color former microcapsule layer 7 and a hard layer 8 are laminated in this order from the side, and the color former microcapsule layer 7 is a transparent layer containing a color former that develops a different color from the back carbon ink. The hard layer 8 is formed as an undercoat layer coated with an undercoat agent, and the color former microcapsule layer 7 is provided on the hard layer 8.

Examples of the color developer used for the color developer layer 5 and the mixed layer 6 include clays such as activated clay, acid clay, zeolite and bentonite, phenol resins, aromatic carboxylic acids. Of polyvalent metal salts and their mixtures can be used.
-A zinc salt of a bisphenol sulfone compound or the like is preferable.

The coloring agent contained in the coloring agent microcapsule layer 7 may be an electron donating coloring agent.
For example, thiazine dyes such as benzoylleucomethylene blue and p-niolobenzoylmethylene blue;
Tri-annealed methane dyes such as bis (p-dimethylaminophenyl) -6-dimethylaminophthalide;
Diphenyl methane dyes such as bis-dimethylaminobenzhydryl benzyl ether; spiro dyes such as 3-phenyl-spirodinaphthopyran; 3-piperidino-
It can be arbitrarily selected from fluoran dyes such as methyl-7-phenylaminofluoran and the like, provided that the color tone is different from that of the back carbon ink.

The microcapsules containing such a color former can be produced by a known coacervation method, interfacial polymerization method, in-situ polymerization method, or the like. And an oil-soluble binder is added. The microcapsules are preferably formed into an ultraviolet-curable ink which can be applied in a spot form and dried quickly without heating. That is, a non-aqueous capsule dispersion, a non-aqueous solvent, a binder, a surfactant, a capsule protective agent,
This is a UV-curable microcapsule coating obtained by mixing a base agent such as an ultraviolet absorber, a photopolymerization initiator, a wax, a thickener, a sensitizer, and a gelling agent, and an auxiliary agent.

The type of the undercoat agent for forming the hard layer is not particularly limited. For example, various medium inks are preferable, and from the viewpoint of production and performance, UV curable medium ink or UV ink is particularly preferable. It is preferable to form by applying an oil-based medium ink.

The pressure-sensitive copying sheet 1 constructed as described above
In use, when the entry field of the transfer sheet 2 is filled in with a ballpoint pen or the like, the corresponding portion 6a of the mixed layer 6 is transferred onto the color former microcapsule layer 7 of the receiving sheet 3 and copied as shown in FIG. At this time, even if the corresponding portion 6a is transferred, the mixture of the developer and the back carbon ink remains in the developer layer 5 as the remaining layer 6b as shown in FIG. Then, the microcapsules of the pressurized color former microcapsule layer 7 are broken, and the color former comes out.
Since the microcapsule layer 7 is hard, the microcapsule layer 7 is pressed against the hard layer 8 when writing, and the microcapsules in the pressurized portion are surely broken. The color former coming out of the microcapsules passes through the drop-out portion 6c of the mixed layer 6, is transferred to the remaining layer 6b and the color developer layer 5, and is present in both the remaining layer 6b and the color developer layer 5. The color former is vividly colored by the color developer. Since the color forming portion 9 is different from the color of the back carbon ink, it can be easily visually recognized.

The corresponding portion 6a of the back carbon ink layer 6 transferred from the transfer sheet 2 is covered on the color former microcapsule layer 7, and there is a concern that the color developer may be transferred to the color developer layer 5 side. However, in the experiment, vivid color development was observed in the color developer layer 5, and it was confirmed that the color developer was transferred to the transfer sheet 2 side.

As described above, the mixed layer 6 is a mixture of the color developer and the back carbon ink. However, if the mixing ratio of the color developer to the back carbon ink is too small, the remaining layer 6b falls off. Even if it is located at the location 6c, there is a possibility that vivid coloration does not occur. If the mixing ratio of the color developer to the back carbon ink is too large, the printability of the mixed ink obtained by mixing the color developer and the back carbon ink may be reduced. Therefore, the mixing ratio is selected from 5 to 60 parts by mass, preferably 10 to 50 parts by mass, and more preferably 15 to 40 parts by mass with respect to 100 parts by mass of the back carbon ink.

FIG. 4 shows a state in which an attempt is made to falsify the pressure-sensitive copying sheet 1. In the case of writing, the entry is made only on the transfer sheet 2. That is, if an incorrect entry is entered in the transfer sheet 2, the entry causes the corresponding portion 6a of the mixed layer 6 to fall off. It is assumed that the transfer sheet is placed on some kind of backing paper in the case of this incorrect description, and even if the transfer sheet is described on one sheet, the corresponding portion is transferred to the underlying surface. And if you do this falsification, there is no receiving sheet,
The color former in the color former microcapsule layer does not transfer, and no color development in the color developer layer 5 is observed. Therefore, at the dropout portion 6b of the mixed layer 6, only a part of the color developer layer 5 looks white. Thus, in the case of correct use, the copy image exists on the back side of the transfer sheet, whereas in the case of falsified unauthorized use, the copy image does not exist on the back side of the transfer sheet. Can be easily determined whether there is tampering.

In the above embodiment, an example of two-sheet copying has been described. However, the present invention is not limited to this, and can be implemented with three or more pressure-sensitive copying sheets. By the way, in the case of three copies, the transfer / receiving sheet is sandwiched between the transfer sheet and the receiving sheet, and the hard layer and the color former microcapsules are sequentially placed on the opposite side of the transfer / receiving sheet from the transfer / receiving sheet side. The layers may be laminated, and a developer layer and a mixed layer may be provided on the opposite surface on the receiving sheet side in order from the transfer / receiving sheet side.

[0016]

As described above, according to the present invention,
A pressure-sensitive copying sheet in which a transfer sheet and a receiving sheet are superimposed, and a color developer layer is provided at a key position on an opposite surface of the transfer sheet, and a back carbon ink is provided on the color developer layer on the receiving sheet side. A color developing agent microcapsule layer containing a color developing agent that forms a color different from the back carbon ink in a predetermined area at least opposite to the mixed layer on the opposing surface of the receiving sheet; Is provided. According to the structure of the present invention, when information is described, since the residual layer containing the color developer is present at the place where the mixed layer falls off, the microcapsules of the color former microcapsule layer are destroyed and the color development that has shifted to the transfer sheet side is performed. The color of the agent is surely developed by the action of both the color developer in the remaining layer and the color developer in the color developer layer, and the degree of color development due to the transfer becomes vivid. Therefore, it is possible to easily confirm the presence or absence of copying on the back side of the transfer sheet, and to achieve an effect excellent in practicality.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a falsification-preventing pressure-sensitive copy sheet according to the present invention.

FIG. 2 is an explanatory diagram showing a correct use state for an example.

FIG. 3 is an explanatory view showing a remaining layer at a place where a mixed layer falls off.

FIG. 4 is an explanatory diagram showing a state of unauthorized use for one example.

5A and 5B show a conventional example, wherein FIG. 5A is an explanatory view showing a conventional back carbon pressure-sensitive copying sheet, FIG. 5B is an explanatory view showing a state of improper use of a transfer sheet, and FIG. It is an explanatory view showing a state of unauthorized use of a sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tampering prevention pressure-sensitive copy sheet 2 ... Transfer sheet 3 ... Receiving sheet 4 ... Binding 5 ... Developer layer 6 ... Mixed layer 6a ... Corresponding portion 6b ... Remaining layer 6c ... Spill-out location 7 ... Color former microcapsule layer 8: Hard layer 9: Colored part

Claims (2)

[Claims] 1. A pressure-sensitive copying sheet comprising a transfer sheet and a receiving sheet superposed on each other, wherein a color developer layer is provided at an important position on an opposing surface of the transfer sheet, and the color developer layer is provided on the receiving sheet side. A mixed layer formed by mixing a back carbon ink and a color developing agent, and a color forming agent that develops a color different from the back carbon ink is contained in at least a predetermined area of the opposing surface of the receiving sheet opposing the mixed layer. A falsification-preventing pressure-sensitive copying sheet provided with a color former microcapsule layer. 2. The falsification-preventing pressure-sensitive copying sheet according to claim 1, further comprising a hard layer formed by applying an undercoat agent between the color former microcapsule layer and the receiving sheet.