JP2001239754A - Pressure-sensitive copying sheet for anti-falsification - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure-sensitive copying sheet for anti-falsification using a back carbon which is contrived to prevent a dishonest act from being committed by easily seeing through a falsification. SOLUTION: In the pressure-sensitive copying sheet 4 for anti-falsification, one of the ends of which is stitched together 3, a developer layer 5 is formed on the back side of an entry column of a transfer sheet 1 and further, a back carbon ink layer 6 is formed on the developer layer 5. In addition, on the surface side of an undersheet 2, a microcapsule layer 7 containing a color coupler is formed at least in a specified region opposite to the carbon ink layer 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In general, copying forms using carbonless paper are the mainstream, but those using back carbon paper are still required due to the sequelae of the toxicity problem of PCB drugs. There is much demand. In the back carbon form, for example, as shown in FIG. 4A, a transfer sheet Q provided with a back carbon ink layer P at a key portion on the back side and a corresponding receiving sheet R are bound at one end by a binding S. The configuration shown is typical.

[0003]

However, in the conventional back carbon form, the transfer sheet Q and the receiving sheet R
There is a problem that there is no way to verify the contents even if the contents are tampered with separately. That is, as shown in FIG. 4 (b) in the application form, the applicant fills out the entry A on the transfer sheet Q1 of the pressure-sensitive copying sheet, and sends the receiving sheet R1 on which the entry A is copied to the acceptor. If the applicant falsifies the entry A on the transfer sheet Q1 or fills in a different entry B for the purpose of falsification on another transfer sheet Q2 as shown in FIG. In the case of discarding the copied receiving sheet R2 of the entry B and replacing the transfer sheet Q2 with the previous transfer sheet Q1, for example, the copy Q1 brought by the applicant and the copy R1 stored by the acceptor are used. , A fraud problem arises. On this occasion,
If the falsification of the applicant is subtle, it will not be possible to determine the authenticity.

An object of the present invention is to provide a falsification-preventing pressure-sensitive copying sheet using back carbon, which can prevent fraud by observing such falsification easily.

[0005]

As a specific means for achieving this object, the present invention provides a color developer layer on a back side of a transfer sheet at a key point and a back carbon ink layer on the color developer layer. In a predetermined region at least facing the back carbon ink layer on the surface side of the receiving sheet,
The gist of the invention is a falsification-preventing pressure-sensitive copying sheet provided with a microcapsule layer containing a color former that develops a color different from that of the back carbon ink.

[0006] When a description is written on a transfer sheet using a ballpoint pen or the like in a writing area set in a predetermined area for preventing falsification of the above configuration, a portion of the back carbon ink layer corresponding to the description is transferred to a receiving sheet. At the same time, the capsules in the microcapsule layer of the receiving sheet were broken by pressure, and the color former was transferred to the developer layer of the transfer sheet, and these reacted and the back carbon ink layer came off. The part develops a color different from that of the back carbon ink. Such color development is not seen on the transfer sheet falsified by the applicant as described above, so that falsification can be easily recognized by the presence or absence of this color development.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a falsification-preventing pressure-sensitive copying sheet according to the present invention will be described with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a transfer sheet, 2 denotes a receiving sheet, and one end thereof is stapled 3 to form a pressure-sensitive copying sheet 4. A developer layer 5 is provided on the back side corresponding to the entry area of the transfer sheet 1, and a back carbon ink layer 6 is provided thereon. On the surface side of the receiving sheet 2, a transparent microcapsule layer 7 containing a coloring agent which develops a color different from the back carbon ink is provided so as to face the back carbon ink layer 6.

Examples of the color developer forming the color developer layer 5 include activated clay, acid clay, zeolite, bentonite and other viscosities, phenol resins, polyvalent metal salts of aromatic carboxylic acids, and mixtures thereof. A zinc salt of a 2,2-bisphenolsulfone compound or the like is preferable because it can be used.

As the color forming agent contained in the microcapsule layer 7, an electron donating color forming agent can be used. For example, a thiazine dye such as benzoyl leucomethylene blue or p-niolobenzoyl methylene blue, 3,3-bis (p -Dimethylaminophenyl) -6-dimethylaminophthalide and other tri-annealed methane dyes; 4,4-bis-dimethylaminobenzhydrylbenzyl ether and other diphenyl methane dyes; 3-phenyl-spirodinaphthopyran And fluorane-based dyes such as 3-piperidino-methyl-7-phenylaminofluoran, etc., 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 pressure-sensitive copying sheet 4 constructed as described above
When a ball point pen or the like is used in the entry field of the transfer sheet 1 at the time of use, the corresponding portion 6a of the back carbon ink layer 6 is transferred onto the microcapsule layer 7 of the receiving sheet 2 and copied as shown in FIG. At this time, the pressurized microcapsule layer 7 is broken at the pressurized portion of the microcapsule, and the color developing agent is transferred to the color developer layer 5 by passing through the drop-out portion 6b of the back carbon ink layer 6, and The color former is colored by the color developer. Since the color forming portion 8 is different from the color of the back carbon ink, it can be easily visually recognized.

On the microcapsule layer 7, a portion 6a of the back carbon ink layer 6 transferred from the transfer sheet 1
Was covered, so there was concern about the transfer of the color former,
In the experiment, color development was observed in the color developer layer 5, and it was found that the color developer was transferred to the transfer sheet 1 side.

FIG. 3 shows an example of falsification using another transfer sheet 11. When a description that is different from the description entered on the transfer sheet 1 is entered, the entry corresponds to the back carbon ink layer 16. The portion 16a falls off. At this time, since the receiving sheet 2 is not present, the color former of the microcapsule layer 7 does not transfer, and no color development in the color developer layer 15 is observed. Accordingly, only the part of the color developer layer 15 looks white at the spot 16b where the back carbon ink layer 16 has fallen off. The same applies when the transfer sheet 1 is falsified.

As a result, the coloring portion 8 exists on the back side of the transfer sheet 1 in the case of correct use, and the coloring portion does not exist on the back side of the transfer sheet 11 in the case of falsified unauthorized use. , It is possible to easily determine whether there has been tampering, that is, whether it has been authenticated.

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, a transfer / receiving sheet is sandwiched between the transfer sheet and the receiving sheet, a microcapsule layer is provided on the front side of the transfer / receiving sheet, and a developer layer and a What is necessary is just to make it the structure which provides a back carbon ink layer.

[0016]

As described above, according to the present invention,
In a copy sheet using back carbon, a color developer layer and a back carbon ink layer were provided on the back surface of the transfer sheet, and a microcapsule layer containing a color former was provided on the surface of the receiving sheet so as to face the back carbon ink layer. ,
At the time of correct use, copying by transfer of the back carbon ink and color formation by transfer of the color former are performed at the same time. At the time of illegal use, no color transfer is performed because there is no transfer of the color former. Therefore, tampering can be easily detected by checking the back surface of the transfer sheet for the presence or absence of coloring, thereby preventing fraudulent acts.

[Brief description of the drawings]

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

FIG. 2 is an explanatory view schematically showing a correct use state.

FIG. 3 is an explanatory view schematically showing a state of unauthorized use.

4A is an explanatory view schematically showing a conventional back carbon pressure-sensitive copying sheet, FIG. 4B is an explanatory view schematically showing a correct use state, and FIG. 4C is a schematic view showing an improper use state. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transfer sheet 2 ... Receiving sheet 3 ... Binding 4 ... Pressure sensitive copy sheet 5 ... Color developer layer 6 ... Back carbon ink layer 7 ... Microcapsule layer 8 ... Coloring part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H085 AA07 BB01 FE02 FE03 FE05 FE12

Claims (1)

[Claims] 1. A color developer layer is provided at a key point on the back side of a transfer sheet, and a back carbon ink layer is provided thereon.
A tamper-resistant pressure-sensitive layer, characterized in that a microcapsule layer containing a color former that develops a color different from that of the back carbon ink is provided at least in a predetermined area on the surface side of the receiving sheet that faces the back carbon ink layer. Copy sheet.