JPH03230995A - Thermal transfer recording medium - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording medium that can record information by printing or writing and has excellent abrasion resistance and stain resistance. Specifically, even if a commuter pass passes through a reading device such as an automatic ticket gate many times, the recorded information will hardly be damaged or smudged or peeled off between layers, and the recorded information will remain intact for a long period of time. The present invention relates to a recording medium that can be kept readable and that can prevent forgery, alteration, or alteration.

[Prior Art] When issuing a large number of commuter passes, etc., it is difficult to efficiently record information specific to the owner on each volume without error. That is, this work was performed by handwriting information specific to the subject onto a recording medium. As a result, there is a strong need for a means to solve the limitations caused by the difficulty in increasing the entry speed or the intervention of errors during entry, such as apparent errors, typographical errors, etc., and automatic ticket issuing machines have been introduced.

However, even if information entry is automated, the following problems still remain.

・Production and durability of the recording medium itself; ・Ease and robustness of information recording; ・Prevention of fraudulent activities.

If these are developed concretely, the following problems will emerge.

・It must be a laminate m - Peeling between each layer - 1) Clogging the automatic ticket gate ・Printing or writing on the surface, staining due to long-term use m - Recorded information becomes difficult to read m - Forgery, falsification, or tampering Some of these are interrelated, and no definitive solution has yet been found to solve or prevent them.

[Problems to be Solved by the Invention] An object of the present invention is to provide effective solutions to the various problems described above. In other words, in addition to withstanding the automatic printing of information on the recording receiving layer of the information recording medium at the time of ticket issuance, the issued tickets not only withstand the harsh conditions of use for a long period of time, but also withstand counterfeiting, falsification, or political controversy. An object of the present invention is to provide an information recording medium having a structure that can effectively prevent the above.

[Means for Solving the Problems] In order to solve the above problems, the present inventors have developed a recording medium having the following configuration: One side of the base layer (a) is coated with at least an organic solvent-resistant resin and a colorant. A record-receiving layer (b) composed of the above-described method is provided, and a tint block layer (c) composed of at least a resin-like substance soluble in an organic solvent is provided on the surface of the record-receiving layer. Thermal transfer recording medium.

Note that, in many applications, the recording medium of the present invention is put to practical use in a form in which a magnetic recording layer is provided on the other surface of the base layer.

The recording medium of the present invention will be explained below based on the drawings.

FIG. 1 is a schematic cross-sectional view of a conventional recording medium. In the figure, reference numeral 1 denotes a base layer made of a base material, which is usually made of polyethylene terephthalate. Its thickness varies depending on the requirements of the application, but it is usually 150 to 25 mm.
It is set to about 0 μm. A recording fixing layer 2 is laminated on one side of the core layer, a tint block layer 3 is further laminated on the surface of the recording fixing layer 2°, and finally a surface protection layer 4 covers the surface of the tint block layer.

In conventional recording media, visible information is recorded on the surface of this surface protective layer 4. Ink or the like for recording visible information passes through the surface protective layer 4 and reaches the fixing layer. A magnetic recording layer 5 is laminated on the other surface of the base layer 1, and in many cases,
A protective layer is laminated on the outside of 5.

FIG. 2 is a schematic cross-sectional view of the recording medium of the present invention. In the figure, 1 is a base layer (a) made of a base material, which is usually made of polyethylene terephthalate. The thickness needs to match the requirements of the application, and as with conventional products,
Usually, it is set to about 150 to 250 μm. In the present invention, 2 laminated on one side of the core layer 1 is a recording receiving layer (
b).

The recording receiving layer (b) in the recording medium of the present invention differs from conventional ones in that it does not require a surface protective layer, so when additives are added to the layer, the ratio should be on the small side within the necessary range. It is desirable to keep it at That is, from the standpoint of preventing stains and recording peeling, it is more advantageous to have a dense layer, so the filler content in the recording receiving layer (b) is usually 1 to 10% by weight, preferably 3 to 5% by weight. Set to weight% (based on the weight of the core layer). Further, in the present invention, the layer 3 laminated on the surface of the recording receiving layer 2 (b) is a tint block layer (c). Unlike conventional recording media, visible information is stored in this ground pattern layer (
c) and recorded on the surface of the recording receiving layer (b). Ink or the like for recording visible information is firmly bound to the recording receiving layer (b) to prevent recording from being lost due to peeling or the like.

On the other side of the base layer (a), shown at 1, in many applications, a magnetic recording layer (d), shown at 5, is laminated, and optionally a protective layer is also laminated on the outside of 5.

In the recording medium of the present invention, the base layer (a,) and the recording-receiving layer (b) can be laminated in various ways, for example, as follows: First, the base layer is prepared, and then the recording-receiving layer is formed on one side of the base layer. The material for the layer is applied by coating or extrusion lamination, and both layers are laminated under heat and pressure: - The base layer and the recording receiving layer are prepared separately, and both layers, once solidified, are laminated under heat and pressure: - Co-extrusion lamination of the base layer and recording receiving layer.

The tint block layer can be laminated onto the laminate of the base layer and the recording receiving layer by, for example, a gravure printing method.

In the recording medium of the present invention, a resin that can be easily dissolved in various organic solvents is selected as the material resin forming the tint block layer provided on the surface of the recording receiving layer.

Such organic solvents are, for example, alcoholic solvents or aromatic solvents. The basis for the dissolving ability of solvents lies in the requirement that the information visually recorded on this recording medium cannot be changed.

This request comes from the perspective of preventing forgery, alteration, or falsification of recording media when they are issued as securities.

In the recording medium of the present invention, the base layer (a) usually has a film thickness of 1
50-25 C) set to tLm. The following materials are commonly used to form the base layer: Paper materials such as synthetic paper, high-quality paper, and coated paper.Synthetic resins, especially thermoplastic resins, which are water resistant and organic solvent resistant. It has excellent flexibility, bending resistance, and rigidity; for example, polyester resins, polyamide resins 1, poly(meth)acrylate resins, polyvinyl chloride resins,
Polyvinylidene chloride resin, polycarbonate resin,
Examples include polyvinyl acetate resin, polyolefin resin, polystyrene resin, ABS resin, AS resin, MBS resin, polyphenylene ether resin, polysulfone resin, and esterified cellulose.

Among these, the following are preferred: polyester resins, such as polyethylene terephthalate resin (PE
T), polybutylene terephthalate resin (PBT),
Polyvinyl chloride resin (PVC), polycarbonate resin (PC), polyolefin resin (PO), such as polyethylene (PE), polypropylene (PP), cellulose triacetate.

In the recording medium of the present invention, the recording receiving layer (b) usually comprises:
The film thickness is set to 10 μm or less, preferably 2 to 5 μm.

Any of the above-mentioned thermoplastic resins may be used as the material for forming the recording-receiving layer. Note that even resin-like materials other than the above-mentioned resins that lack self-supporting properties may be usable as the material resin constituting the recording-receiving layer of the present invention.

Examples of properties required of the material for the core layer include: - It should be a solvent-resistant and light-colored resin - It should be able to be firmly bonded to the base layer by heat or adhesive, etc.・Water resistance and organic solvent resistance. ・The colorant to be blended must be well dispersed (excellent compatibility with additives).

In the recording medium of the present invention, the light-colored additives (expected to have functions such as coloring and/or lubricant) that are usually added to at least the recording-receiving layer are as follows: inorganic pigments, organic pigments, or similar white or It is a light colored powder. Here, the term "light color" is a concept that includes cream color, pink, light blue, light blue, mauve, beige, and the like. Its use form is usually in the form of a fine powder.

As white pigments, the following can be used: titanium dioxide, zinc oxide, zinc sulfide, calcium carbonate,
Barium sulfate etc. Note that light-colored pigments are not limited to those that are light in themselves; even if they are dark in themselves, they can be used as additives to lighten colors if they can be made lighter by blending with white pigments, etc. It is possible.

Among these, preferable additives include titanium dioxide and calcium carbonate.

The recording-receiving layer of the present invention may also contain a lubricant. As lubricants, mention may be made of: powdered silica, talc, kaolin, zeolite, polyimide resin powder. Low molecular weight polytetraethylene resin (PT
FE) powder, calcium stearate, tin stearate, finely powdered polyethylene, etc. Incidentally, most of the additives mentioned above can serve both as a coloring agent and a lubricant.

The recording-receiving layer can also be prepared by further adding a curing agent to these, if necessary.

As the curing agent, a suitable one from among chemical curing agents, ultraviolet curing agents, electron beam curing agents, etc. can be used as required.

In the recording medium of the present invention, the background pattern layer (c) has a film thickness of usually 2
The thickness is set to 0.5 to 1.5 μm, preferably 0.5 to 1.5 μm.

As the resinous material constituting the tint block layer, it is necessary to use a resinous material that is easily soluble in an organic solvent that is difficult to dissolve the base layer and recording receiving layer of the recording medium. In other words, having the property of being extremely sensitive to erasure by alcohol, aromatic solvents, plastic erasers, etc., which are easily used for forgery, alteration, or acts of political debate, is useful in preventing these fraudulent acts. .

Examples of resins commonly used as materials for the background pattern layer include: synthetic resins such as polyvinyl formal, polyvinyl acecool, and polyvinyl butyral, and natural resins such as pine resin and shellac.

Note that when the background pattern layer is formed from a composition mainly composed of hydrocarbon resin, the recording medium of the present invention can prevent fraudulent acts even if an aromatic solvent such as benzene, toluene, or xylene is used.

Example 1 White polyethylene terephthalate sheet [film thickness: 188
μm, trade name: E-24 (manufactured by Toshi)] In order to form a recording-receiving layer on one side, the following recipe was used: 20 parts by weight of polyester resin [trade name:
Byron RV-300 (manufactured by Toyobo)] Methyl ethyl ketone (MEK) 20 parts by weight Toluene
20 parts by weight cyclohexanone 4
0 parts by weight A paint obtained by mixing and dispersing these four materials in a ball mill for 3 hours was applied using a bar coater #20.
It was then dried. The thickness of the obtained receptor layer was 5 μm.

Next, in order to form a background pattern layer on the surface of the receptor layer, the following operation was performed using the following recipe: Polyvinyl butyral resin 10 parts by weight [trade name:
S-LEC B (Made by Building Block Chemical)] MEK
30 parts by weight toluene
30 parts by weight of cyclohexanone 30 parts by weight of the four components were stirred for 5 hours at a temperature of 25°C to prepare a solution, and to this was added 0.7 parts of pigment (name: Microlith Blue).
Parts by weight were added to uniformly color the tint pattern paint, and the obtained tint block paint was printed on the surface of the recording-receiving layer by a gravure printing method and then dried. The thickness of the formed background pattern layer was 0.7 μm.

An information recording test using the thermal transfer method shown in FIG. 3 was conducted on this recording medium.

In FIG. 3, a thermal transfer ribbon TR is transferred onto the surface of the recording receiving layer of the recording medium of the present invention by a thermal head TH of a thermal transfer printer (not shown). The transcribed information is the letter A, and is approximately 8mm wide x 11mm high.
The image had clear outlines.

In addition, a test piece made of this recorded medium was placed in an automatic ticket gate for three times.
A test was conducted in which the test pieces were passed continuously 000 times, and the condition of the test pieces thereafter was evaluated by visual judgment. The results are shown in Table 1.

5 [Effects of the Invention] The recording medium of the present invention is a recording medium that can record information by printing or writing, and has excellent abrasion resistance and stain resistance. Even if it is placed under harsh usage conditions such as passing through it many times,
There is almost no damage or staining of the recorded information, peeling between layers, etc., and not only the recorded information is kept readable for a long period of time, but also counterfeiting, falsification, and political theory can be prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a conventional recording medium, FIG. 2 is a schematic sectional view of a recording medium of the present invention, and FIG. 3 is a schematic sectional view of a device and operation for recording information on the recording medium of the present invention. This is a sketch. l... Base layer 2... Record receiving layer; 2°... Record fixing layer 3
... Tint block layer 4 ... Surface protection layer 5 ... Magnetic recording layer TH ... Thermal head TR ... Transfer ribbon PR ... Printing section

Claims (2)

[Claims] (1) A recording-receiving layer (b) made of at least an organic solvent-resistant resin is provided on one side of the base layer (a), and a recording-receiving layer (b) made of at least an organic solvent-resistant resin is provided on the surface of the recording-receiving layer. A thermal transfer recording medium characterized by being provided with a background pattern layer (c). (2) The recording medium according to claim 1, wherein a magnetic recording layer is provided on the other surface of the base film.