JPS58105428A - Colored magnetic 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 The present invention utilizes a printing layer made of a printing ink containing dispersed scale-like substances as a hiding layer, which completely covers the magnetic layer without deteriorating its magnetic properties. The present invention relates to a colored magnetic recording medium that can be obtained and manufactured at low cost.

2. Description of the Related Art In magnetic recording media such as bank cards, credit cards, commuter passes, and bankbooks, various methods have been devised to hide the color of the dark brown magnetic layer and to color it in a desired color.

The purpose of concealing the il layer is to prevent the presence of the magnetic layer to prevent counterfeiting and tampering, and to diversify designs by coloring the magnetic layer.

On the other hand, since the ma formed for the purpose of concealment is interposed between the magnetic layer and the magnetic head for reading it,
It must be thinner because it inevitably increases so-called spacing V-loss and deteriorates magnetic properties.

Conventional configurations of this concealing colored layer include those in which a colored layer is first provided directly on the magnetic layer, and those in which a white saponified titanium paint is applied and a colored layer is applied over it. In the conventional example, the hiding power is weak, and in order to obtain sufficient hiding power, a thickness of 10 μ or more is required, and the spacing loss is inevitably large.

An alternative structure is to first form a thin layer of non-magnetic metal or its oxide as a concealing layer on the magnetic layer by vapor deposition or sputtering, and then add a colored layer on top of this thin layer. There is something set up.

With this structure, sufficient hiding power and coloring effect can be obtained without causing spacing loss, but the production cost is high and small lot production is difficult.
There is a drawback in terms of production that the distance is small and therefore the production efficiency is poor. Another structural disadvantage is that a colored layer is formed on the metal layer, and the adhesion between the two layers is poor.

Furthermore, other conventional designs include Japanese Patent Application Laid-Open No. 56-13431
As described in Publication No. 6, a coating obtained by dispersing and mixing non-magnetic metal powder in a binder is applied to the magnetic layer and dried for the concealing layer containing non-magnetic metal powder on the magnetic layer. This method uses a concealing layer formed by this method. However, even in this invention, simply coating is used as a means for forming the concealing layer.

In addition, the productivity is low and the uniformity of the transparent surface is lacking.Also, even with the non-magnetic metal powder used for this purpose, if it is not applied to a certain thickness, the required concealing effect and effect cannot be achieved. This method has the same drawbacks as the first conventional example in that it is not possible to obtain the desired thickness, there is a limit to the thinning of the layer, and cisbasing loss may occur.

The present invention was proposed by Honda as an alternative to the conventional example, and uses printing as a means of forming the concealing layer, and also adopts ink made of dispersed scale-like substances as the material for forming the concealing layer. Another object of the present invention is to provide a colored magnetic recording medium that can be completely concealed and colored with a thin layer with almost negligible spacing loss, and can be manufactured at low cost.

That is, the present invention relates to a colored magnetic recording wire characterized in that a concealing layer is provided by printing a printing ink containing scale-like materials dispersed on a magnetic layer, and a colored layer is provided on the concealing layer. This will be explained below according to an embodiment shown in the drawings.

In Figure 11, 2 is magnetic theory, support 10 table FkJ
Kk & has been done. Reference numeral 3 denotes a concealing layer provided by printing a printing ink formed by dispersing scale-like substances on the magnetic layer 12. That is, as the means for forming the concealing layer 3, any printing method including offset, dry offset, gravure, V-lux screen, flexography, and letterpress can be employed, but offset □, dry offset, and letterpress are particularly preferred. The printing inks used include gravure ink, flexo ink, letterpress ink, offset ink, offset ink, process ink, carton ink, dry offset ink, as well as special types such as various plastic films and metal foils, depending on their ingredients and properties. Inks for printing materials can be mentioned.

Vehicles used in the above inks include those for letterpress ink, newspaper ink, magazine rotary ink, letterpress flatbed ink, photographic black ink/mauve ink, and heat set ink.

Vehicles for lithographic printing inks include quick soba ink, moisture set ink, linseed oil ink, alkyd ink, quick-drying resin ink,
Vehicles for offset heat set inks are used as vehicles for gravure inks, vehicles for sales and packaging, and vehicles for flexographic inks such as alcohol-type,
Examples of the mixed solvent type and aqueous vehicles include vehicles for concave strip ink, gold maple printing ink, and silk screen ink. Also, as for the scale-like substances dispersed in the printing ink used for this, first of all, as a metal material, lead chloride is used.

There are pearl pigments (pigments containing metal oxides), and non-metallic materials include mica, shellfish, powder, etc.
Toru powder is very common, its content is 20-80%
However, for offset printing ink, 20 to 40%, dry offset, - for letterpress, 20 to 60% is excessive, gravure ink is Filo ~ 30, and silk screen is 20 to 40%. It can be changed from 10 to 60 degrees. Incidentally, when the amount of Aj powder packed is increased, the adhesion to the magnetic j112 decreases, but the layer thickness can be made much thinner.

Furthermore, since the printing ink of the present invention uses a scale-like material as a pigment, calendering after printing further enhances the hiding effect.

Reference numeral 4 denotes a colored layer, which is formed by adding a desired color or Fi pattern using colored ink or a working material.The colored layer 4 may be overcoated as necessary.

FIG. 2 shows another embodiment in which a white ink layer 5 is applied to a thickness of 1.0 to 10.0 μm on the glazing layer 3, and then a layer of 01 to 3.0 μm is applied on top of the white ink layer 5. A colored layer is provided.

Example: HC = 3000'e φ7- = 1.40 Ma
xwell/CI.

On a commercially available magnetic sheet with φγ/φμ = 0.75, offset printing button ink with an aluminum powder content of 30 liters was used, and it was tested with a BI tester (indigo color) as QDl cc,
0.03 cc.

0.95cc, Q, Q 7+w, Q, l QW
The paper was printed with 0.1 cc of copper ink, dried, and colored with three colors of yellow, red, and indigo, each with an amount of 0.1 cc of copper ink. 3-5% for colored ink (O, ICE), 5-8% for Q, 93cc.

0.05 (8-12% at 7-1010.07W for IC)
, Q, lcc decreased by 10-15%. However, these values do not have any negative effect on the magnetic properties in practical use.
It can be used, the coloring effect was good, and the hiding power of the silver ink layer was sufficiently obtained.

By the way, the thickness of the plane ink layer and the colored layer were as follows.

Silver ink O, OIC 0.5-1. on0.03 Snake 0
, 5~1.0μ 0.05 race, 1.0~1.5μ 0.0761! Q is 1.0-1.5μ, loc is 1.5-9. It was ranked OA.

As explained above, the present invention uses a printing ink in which scale-like substances are dispersed, and this is used as a layer to hide the air layer by printing means. Due to the leafing effect that floats and is arranged on the vehicle surface, it has higher hiding power than white layers such as titanium oxide, and good hiding power can be obtained with a thin layer thickness, thus causing spacing loss. sufficient concealment can be achieved without

Specifically, the thickness of silver jllj is 0.1 to 1.0μ, which has sufficient hiding power, and the color and luster is silver matte, and the thickness of the colored layer above it is #'i0.1 to 1.0μ. The required coloring effect can be obtained when the thickness of the colored layer is 10 to 1.0 μm, and therefore, the same effect as a vapor-deposited colored layer can be obtained without deteriorating the magnetic properties due to spacing loss.

In addition, in terms of quality, even if a general company prints a layer printed with ink directly on the magnetic layer, it will not adversely affect corrosion resistance like the A7 island layer, but will improve the adhesion to the magnetic layer and the adhesion to the colored layer. It has the advantage of being able to be manufactured without requiring a single anchor layer or a single primer layer, etc., and can easily be pattern coated on the magnetic layer, and is also easier to manufacture than KFi's conventional AJ coating layer. This has many effects such as lower cost. In the case of forming the special Kid Kiseki by printing, it is possible to manufacture the magnetic layer, the printing layer which is the hiding layer, and even the colored layer on an integrated printing line (needless to say, the overcoat layer is also the same). (1) The benefits it has on productivity, cost, line production of manufacturing equipment, etc. are very large.

As mentioned above, the colored layer of the hiding layer 9 has a thickness of 0.1 to 1.0μ.
Although sufficient hiding power and coloring effect can be obtained with
If both sides have a thickness of 0.1 to 3.0 μm, a desired colored magnetic recording medium can be obtained without deteriorating magnetic properties.

[Brief explanation of drawings]

FIG. 11 is a schematic cross-sectional view showing one embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view showing another embodiment.

Claims (1)

[Claims] 1. A colored magnetism characterized in that a printing ink containing a scale-like substance dispersed therein is printed on a magnetic layer to form a hiding layer, and a colored layer is provided on the hiding layer. recoding media. 2. A colored magnetic recording medium according to claim O@I+, characterized in that the hiding layer is calendered. 3. A colored magnetic recording medium according to claim 1 or 12, characterized in that a white ink layer is provided between the hiding layer and the colored layer. 4. A colored magnetic recording medium according to claim 11, item 2.3, characterized in that an overcoat layer is provided on the colored layer.