JP2003211873A - Magnetic recording medium and decorated magnetic recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic recording medium or the like having on a magnetic recording layer a hiding layer on which a color print of visible information or the like being excellent in brightness and clarity and having a high aesthetic value can be provided. <P>SOLUTION: The magnetic recording medium has a constitution wherein the magnetic recording layer provided on a sheet surface is hidden visually by providing thereon the substantially white hiding layer having a thickness of 15 μm or below, preferably 12 μm or below. When the thickness of the substantially white hiding layer exceeds 15 μm, an error sometimes occurs or reading sometimes becomes impossible according to the capacity of a data reading device, on the occasion of reading the data recorded on the magnetic recording layer below the hiding layer. When the thickness of the hiding layer is 15 μm or below, however, the error does not occur or reading does not become impossible according to the capacity of the data reading device, on the occasion of reading the data. Even when the color print is provided further on the substantially white hiding layer, no hindrance occurs for reading the data. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a magnetic recording medium and a decorated magnetic recording medium.

[0002]

2. Description of the Related Art Conventionally, a magnetic recording medium, such as a magnetic recording card, is generally provided with a dark brown or black magnetic recording layer on the entire surface or a part of a white plastic sheet. Therefore, when further providing visible information or a visible design (hereinafter referred to as visible information) on the card, the visible information or the like with high brightness and clearness must be printed unless the visible information is printed while avoiding the magnetic recording layer. Cannot print.

In order to solve this drawback, a thin concealing layer has been provided over the entire surface on which the magnetic recording layer is provided. However, if the concealing layer is thickened, the data recorded in the magnetic recording layer is increased. Since it becomes impossible to read and the function as a magnetic recording medium is not fulfilled, it is necessary to limit the thickness of the hiding layer.

In order to visually hide the magnetic recording layer with such a thin hiding layer, it is necessary to use an ink having a high hiding rate. For this reason,
The printing ink used for the hiding layer is 0.5 to 20 μm.
A silver or lead color ink containing aluminum flakes having a particle size of about m has been used. According to such a method, the magnetic recording layer was certainly visually concealed and the data recorded on the magnetic recording layer could be read.

[0005]

However, visible information or the like is generally printed by printing on the concealing layer, but since the printed layer of visible information or the like formed by printing is extremely thin, printing of visible information or the like is performed. The silver or lead color of the underlying concealment layer can be seen through the layers. For this reason, the brightness and sharpness of the visible information are lost, and the result is that beautiful visible information cannot be obtained.

Therefore, there is a demand for the appearance of a magnetic recording medium having a concealing layer on the magnetic recording layer, which has good brightness and sharpness and can be printed with visible information of high aesthetic value.

Therefore, an object of the present invention is to provide a magnetic recording medium having a concealing layer on the magnetic recording layer, which is capable of performing colored printing such as visible information having good brightness and sharpness and high aesthetic value. . Another object of the present invention is to provide a decorative magnetic recording medium having a high design property, in which the concealing layer on the magnetic recording layer is printed with visible information and the like having good brightness and sharpness and high aesthetic value. .

[0008]

In order to solve the above-mentioned problems, the present invention provides a magnetic recording layer on the surface of a sheet, and further provides a substantially white hiding layer having a thickness of 15 μm or less, preferably 12 μm or less. Thus, a magnetic recording medium in which the magnetic recording layer is visually hidden is provided.

If the thickness of the substantially white hiding layer exceeds 15 μm, an error occurs when reading the data recorded in the magnetic recording layer thereunder, or the data cannot be read depending on the capability of the data reading device. A case arises. Also,
When color printing is further performed on the substantially white hiding layer, the error occurrence rate and the unreadable rate increase.

However, if the thickness of the substantially white hiding layer is 15 μm or less, an error will not occur when reading the data, or the data cannot be read depending on the capability of the data reading device. Further, even when color printing is further performed on the substantially white hiding layer, there is no problem in reading the data.

Further, if the thickness of the substantially white hiding layer is 12 μm or less, complete data reading can always be performed even when the environmental conditions at the time of reading the data are bad. Also,
Even when multiple colored printings are performed on the substantially white hiding layer, there is no problem in reading the data.

When visible information or the like is printed on the concealment layer, the visible information layer formed by printing is extremely thin, so that the underlying concealment layer can be seen through the printed visible information or the like. . However, since the concealing layer of the present invention is substantially white and has a high brightness itself, even if the substantially white of the base is seen through through the visible information that is printed, the brightness and clearness of the printed colored visible information are clear. Beautiful visual information can be obtained without losing the degree.

Further, in order to complete the visual hiding power of the magnetic recording layer by the substantially white hiding layer having a thickness of 15 μm or less, the substantially white hiding layer is composed of a plurality of printing layers and is visually observed. A white pigment is contained in the outermost layer, preferably 80% by weight or more of the color pigment contained is a white pigment,
At least one inner layer comprises a white pigment and a metal powder, preferably 10 to 200 parts by weight of metal powder per 100 parts by weight of the white pigment.

In this case, not only can the magnetic recording layer be hidden almost completely by the white pigment and the metal powder contained in the inner layer, but the white pigment contained in the outermost layer in an amount of 80% by weight or more can form a masking layer. The almost whiteness is fully exhibited. In order to make the outermost layer as close to white as possible, it is preferable that 98% by weight or more of the pigment contained in the outermost layer is a white pigment.
However, when the metal powder contained in the inner layer exceeds 200 parts by weight per 100 parts by weight of the white pigment, the color of the inner layer becomes dark, and the outermost layer, which should be substantially white, tends to be affected. The metal powder contained in the inner layer is white pigment 10.
When the amount is less than 10 parts by weight per 0 parts by weight, the visual hiding power for the magnetic recording layer tends to decrease.

In the metal powder, the shape of the powder is not particularly limited, but in order to make the hiding layer as thin as possible and enhance the hiding property, the shape of the powder is preferably flake. . Further, the kind of the metal in the metal powder is not particularly limited, but as described above, it is preferable that the powder has a flake shape in order to enhance the hiding property while making the hiding layer as thin as possible. Therefore, it is preferable that the kind of metal is aluminum, which facilitates the formation of powder into flakes. Further, when aluminum flake is used, the average flake diameter (average value of the maximum length of each flake) is 0.5 to 20 μm in order to make the hiding layer as thin as possible and improve the hiding property. preferable. However, it may be a mixture of aluminum flakes and aluminum powder other than flakes.

The magnetic recording medium of the present invention generally forms a visual hiding layer by multilayer printing as described above, but unless otherwise specified, the total thickness of the hiding layer is as thin as possible. In order to achieve this, it is most preferable that the structure is composed of two layers, an outer layer and an inner layer.

As an example of the ink for forming the outer layer, an ink containing 100 parts by weight of titanium oxide pigment, 40 parts by weight of vinyl chloride-vinyl acetate copolymer resin, 140 parts by weight of solvent and 5 parts by weight of other additives (hereinafter referred to as "ink") , Ink A)
There is. Further, an ink in which the vinyl chloride-vinyl acetate copolymer resin contained in the ink A is replaced with a polyester resin can also be exemplified.

As an example of the ink for forming the inner layer, 100 parts by weight of titanium oxide pigment and an average flake diameter of 12 are used.
There is an ink (hereinafter referred to as ink B) containing 40 parts by weight of aluminum flakes having a size of μm, 40 parts by weight of vinyl chloride-vinyl acetate copolymer resin, 160 parts by weight of solvent, and 5 parts by weight of other additives.

The present invention also provides a decorative printed magnetic recording medium in which decorative printing of visual information, design or the like is provided by color printing on a substantially white hiding layer provided on the magnetic recording medium. That is, as described above, even if the white color of the background can be seen through the printed visible information, the lightness and sharpness of the printed colored visible information is not lost. It is possible to provide a decorative magnetic recording medium having a high design property, in which, etc. are printed in color.

Further, in the decorated magnetic recording medium,
It is preferable that the substantially white hiding layer is provided by screen printing, and the colored printing is provided by offset printing on the hiding layer. In screen printing, the thickness of the printing layer can be adjusted freely, so that if a substantially white hiding layer is provided by screen printing, the thickness can be easily reduced to 15 μm or less, preferably 12 μm or less.

Further, if the color printing on the substantially white hiding layer is performed by offset printing, the thickness of the color printing layer can be suppressed to be small, and the influence at the time of reading data from the magnetic recording layer will be small. Therefore, it is possible to provide a decorative magnetic recording medium having a high design property while minimizing the influence of reading data from the magnetic recording layer.

[0022]

EXAMPLES Examples of the present invention will be described below together with comparative examples. Example 1 A base material in which a dark brown magnetic recording layer was provided in a strip shape on one side (hereinafter referred to as side A) of a white PET sheet was used.
The ink B was screen-printed on the surface of the magnetic recording layer, and the ink was dried to form an inner layer having a thickness of 5 μm. Further, the ink A was used for screen printing on the inner layer, and the ink was dried to form an outer layer having a thickness of 7 μm. The total thickness of the white hiding layer composed of the inner layer and the outer layer thus produced was 12 μm, and the magnetic recording layer was completely hidden by the white hiding layer,
It became white all over. When a colored design was applied to the whitened side A by offset printing, a design card with high brightness, sharpness and high beauty was obtained. This card was used as a magnetic recording card, and it exhibited its performance without any problems.

Example 2 Example 2 was carried out in the same manner as in Example 1 except that the white hiding layer having the structure shown in Example 1 was provided over the entire surface A of the substrate. The results obtained were similar.

Comparative Example 1 The substrate used in Example 1 was used, and a white hiding layer having a thickness of 12 μm was provided on the entire surface of the A side using only the ink A. Could not be concealed, and offset printing with high brightness, sharpness and high beauty could not be applied on the magnetic recording layer.

Comparative Example 2 Using the base material used in Example 1, a white layer was provided on the entire surface of A side using only the ink A to visually hide the magnetic recording layer. The hiding layer had to have a thickness of 30 μm. Although offset printing with high brightness and vividness and high aesthetics could be obtained as in the example, this card could not be used as a magnetic recording card because it did not function as a magnetic recording card.

Comparative Example 3

Using the substrate used in Example 1, the
Screen printing was performed on the entire surface using an ink containing 40 parts by weight of aluminum flakes having an average flake diameter of 12 μm, 40 parts by weight of vinyl chloride-vinyl acetate copolymer resin, 160 parts by weight of solvent, and 5 parts by weight of other additives, The ink was dried to provide an inner layer with a thickness of 5 μm. Further, using the ink A, an outer layer having a thickness of 7 μm was provided. The masking layer thus prepared masked the magnetic recording layer, but the inner layer was visible through the entire layer, and the whiteness was low.
Therefore, design printing was performed by offset printing as in Example 1, but the design was low in brightness and a design card with high beauty could not be obtained.

[0028]

As described above, according to the present invention, a magnetic recording layer is provided with a concealing layer capable of performing colored printing such as visible information having high brightness and sharpness and high aesthetic value. A recording medium can be provided. Further, according to the present invention, it is possible to provide a decorative magnetic recording medium having a high design property, in which the concealing layer on the magnetic recording layer is printed with visible information or the like having high brightness and sharpness and high aesthetic value. You can

Claims (7)

[Claims] 1. A magnetic recording layer is provided on a sheet surface, and a substantially white hiding layer having a thickness of 15 μm or less is further provided on the magnetic recording layer to visually hide the magnetic recording layer. Magnetic recording medium. 2. A magnetic recording layer is provided on the surface of the sheet, and a substantially white hiding layer having a thickness of 12 μm or less is further provided on the magnetic recording layer to visually hide the magnetic recording layer. Magnetic recording medium. 3. The substantially white hiding layer is composed of a plurality of printing layers, and the outermost layer to be visually observed contains a white pigment,
The magnetic recording medium according to claim 1, wherein at least one inner layer contains a white pigment and a metal powder. 4. 80% by weight or more of the colored pigment contained in the outermost layer to be visually observed is a white pigment, and the at least one inner layer comprises a white pigment and 10 to 200 parts by weight per 100 parts by weight of the white pigment. 4. The magnetic recording medium according to claim 3, wherein the magnetic recording medium comprises: 5. The magnetic recording medium according to claim 3, wherein the metal powder is an aluminum powder. 6. Decorative printing, characterized in that colored information such as visual information or design is printed on the substantially white hiding layer provided on the magnetic recording medium according to any one of claims 1 to 4. Magnetic recording medium. 7. The decorative magnetic recording medium according to claim 6, wherein the substantially white hiding layer is provided by screen printing, and the colored printing is performed on the hiding layer by offset printing.