JP2515557B2 - Optical recording medium and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to an optical recording medium for optically recording / reproducing information and a method for manufacturing the same.

[Prior Art] Conventionally, magnetic materials have been mainly used as recording materials embedded in cards such as credit cards, bank cards, and clinic cards. However, such a magnetic material has problems that writing and reading of information can be easily changed and high density recording cannot be performed.

In order to solve such a problem, an optical information recording method using an optical card has been proposed as a means for efficiently handling a wide variety of information, and an optical information recording medium and a recording / reproducing apparatus therefor have been proposed.

This optical card as an information recording medium is an optical card that generally uses laser light to volatilize a part of an optical recording layer on an information recording carrier, change reflectance, or cause deformation. Information is recorded and reproduced depending on the difference in reflectance or transmittance. In this case, the optical recording layer does not need to be developed after writing information, and can be "read directly after writing", so-called DRAW [Direct read after w
rite)] medium, high-density recording is possible, and additional writing is possible, so it is effective as a recording medium for optical cards.

In addition, printing with ink, particularly the ink jet recording method, involves recording fine particles such as images by ejecting minute liquid droplets of the ink according to various operating principles and adhering them to a recording medium such as paper. It is characterized by low noise, easy multi-coloring, great flexibility in recording patterns, and no need for development or fixing. It can be used in various applications as a recording device for various figures and color images including Chinese characters. It is spreading rapidly. In addition, images formed by the multicolor inkjet system can also be used for multicolor printing by the platemaking system and for obtaining records that are comparable to printing by the color photographic system, and for applications that require a small number of copies. Since it is cheaper than photographic technology, it is being widely applied to the field of full-color image recording.

On the other hand, when using the optical card, it is essential that a personal database is recorded. In this case, the record is played back with a code that can be understood only by an individual, but the user is not limited to the owner of the optical card. For example, when a doctor, staff of various financial institutions, etc. also use it. There is. Therefore, a record of who owns the optical card is required.

However, even a magnetic card is currently spending a considerable amount of time to register each individual. In addition to the name, a photo or the like can be printed on the optical card, but a silver salt photo is not printed in a short time, and problems such as surface treatment or influence on the optical recording medium occur.

[Problems to be Solved by the Invention] An object of the present invention is to solve the problems of the prior art such as vapor, and to absorb the ink of the inkjet recording method on the side opposite to the surface used for recording / reproducing of the optical recording medium. An object of the present invention is to provide an optical recording medium and a manufacturing method thereof, in which an ink jet recording method, which has undergone remarkable technological development, can be easily used by providing a layer, and printing can be easily performed in a short time.

[Means for Solving Problems] and [Function] That is, the present invention provides an optical recording medium in which an optical recording layer and a protective layer are laminated in this order on a substrate, and An optical recording medium having an ink absorbing layer capable of absorbing ink applied by an inkjet recording method on a surface opposite to a side facing a recording layer.

Further, the present invention is an optical recording medium in which an optical recording layer and a protective layer are laminated in this order on a substrate, and an inkjet is provided on the surface of the protective layer opposite to the side facing the optical recording layer. Printing is performed by having an absorption layer capable of absorbing the ink applied by the recording method, and by adhering the ink to the surface of the ink absorption layer by the inkjet recording method and absorbing the ink in the ink absorption layer. It is an optical recording medium characterized in that

Furthermore, the present invention provides a method for printing on the surface of an optical recording medium in which an optical recording layer and a protective layer are laminated in this order on a substrate, in the side opposite to the side of the protective layer facing the optical recording layer. An optical recording medium having an ink absorbing layer capable of absorbing ink used in the inkjet recording method is prepared on the surface of the ink, and the ink is adhered to the surface of the ink absorbing layer by the inkjet recording method. It is a method of printing an optical recording medium, which is characterized in that it is absorbed by and printed.

Further, according to the present invention, the optical recording layer and the protective layer are provided in this order on the substrate, and the ink applied by the inkjet recording method is absorbed on the surface of the protective layer opposite to the side facing the optical recording layer. In the method for producing an optical recording medium, the ink absorbing layer as described above is formed by coating the surface of the protective layer with the ink absorbing layer.

 Hereinafter, the present invention will be described in detail.

In the present invention, at least one ink absorbing layer is laminated on a protective layer provided on the side opposite to the recording and reproducing light incident side of the optical recording medium.

The ink absorbing layer referred to in the present invention is an ink fixing of an ink jet recording method obtained by applying a coating liquid consisting of a pigment and a binder, which are void-constituting materials, on a suitable support or directly on the protective layer. It means a layered constituent layer that has the ability to absorb ink.

Examples of the void constituent material include calcium carbonate, kaolin (white clay), talc, calcium sulfate, barium sulfate, titanium oxide, zinc oxide, zinc carbonate, aluminum silicate, aluminum hydroxide, aluminum oxide, calcium silicate, magnesium silicate. Inorganic and organic pigments such as amorphous silica, synthetic zeolite and plastic pigments, and urea resin pigments can be used together.

In order to form the ink absorbing layer by coating these pigments on the support or the protective layer, a binder for adhering the pigments to the support or the protective layer is required. For example, oxidized starch, etherified starch, cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, casein, gelatin, soybean protein, polyvinyl alcohol and its derivatives, maleic anhydride resin, ordinary styrene-butadiene copolymer, methyl methacrylate- Conjugated diene polymer latex such as butadiene copolymer, acrylic polymer latex such as polymer or copolymer of acrylic acid ester and methacrylic acid ester, vinyl polymer latex such as ethylene vinyl acetate copolymer, or Is a functional group-modified polymer latex of a monomer containing a functional group such as a carboxyl group of these various polymers, an aqueous adhesive such as a thermosetting synthetic resin system such as a melamine resin or a urea resin, and a polymethylmethacrylate or a polyurethane resin. Unsaturated poly Ester resin, vinyl chloride - vinyl acetate copolymer, polyvinyl butyral, synthetic resin adhesives such as alkyd resins are used alone or in combination.

These binders are 60 to 2 per 100 parts by weight of pigment.
00 parts by weight, preferably 100 to 170 parts by weight are used. In the present invention, this pigment / binder weight ratio is extremely important, and the amount of binder is 6 per 100 parts by weight of the pigment.
If it is less than 0 parts by weight, the adhesion of the pigment will be deteriorated, which may cause clogging of the inkjet nozzle. Also, 200
If the binder is used in an amount exceeding the amount by weight, the ink absorbency will be extremely reduced and the printing performance on the optical recording medium will be impaired.

Further, if necessary, pigment dispersant, thickener, fluidity modifier, defoaming agent, foam suppressor, release agent, foaming agent, penetrant, coloring dye, coloring pigment, fluorescent brightening agent, ultraviolet absorber. Further, an antioxidant, an antiseptic agent, an antifungal agent and the like can be appropriately mixed.

As the protective layer or support, plastic, paper, ceramics, metal or the like having the ability to absorb and adhere an appropriate amount of the coating liquid is used. It may also be attached to paper. These protective layers or supports are those in which addition of the internally added sizing agent is restricted in order to have appropriate absorbability, and it is most preferable not to add the internally added sizing agent. Further, the filler may or may not be contained, but it is preferable to contain an appropriate amount of filler in order to adjust the absorption amount and absorption rate. In this case, as the filler, for example, titanium oxide, calcium sulfate, heavy calcium carbonate, light calcium carbonate, clay, talc, amorphous silica, and many other substances that are commonly used as fillers can be used. The content of these is usually about 0 to 25%, preferably 5 to 20%.

Using a Fourdrinier paper machine or the like, from a slurry to which pulp, if necessary, a filler, a yield improver, a toning agent, and the like are appropriately added, paper having a predetermined basis weight is made into a paper, and laminated with a protective layer or a support. Is also good.

In this case, it is possible to improve the surface strength etc. by adhering a water-soluble polymer liquid such as starch, polyvinyl alcohol, acrylamide, etc. using a size press device, a gate roll device, a spray device or the like which is usually used. Yes,
There is no problem. In this way, it can be used as a part of the protective layer or the support having a high absorbability and used in the present invention.

In order to form the ink absorbing layer on the protective layer or the support, the coating liquid is applied by a commonly used coating machine and dried. As the coating machine, a blade coater, an air knife coater, a roll coater, a brush coater, a curtain coater, a bar coater, a gravure coater, a spray device and the like which are commonly used are used. Coating amount is 1 to 30 g / m ² as dry solids, preferably 3~18g / m ^2. The coated paper can be laminated as it is and used as the laminated ink absorbing layer according to the present invention, but it is also possible to impart surface smoothness through a roll nip under pressure and / or heating with, for example, a super calender or a gloss calender. Is.

In the present invention, the thickness of the ink absorption layer is usually 1
-30 μm, preferably 1-20 μm is desirable.

[Examples] Hereinafter, the present invention will be described more specifically with reference to Examples. However, parts indicate parts by weight.

Example 1 An optical card having the layer structure shown in FIG. 1 was prepared as follows.

On a support 6 made of a corona-treated 75 μm polyester film, a coating solution containing 15 parts of polyvinyl alcohol and 100 parts of colloidal silica (refractive index 1.45) and having a solid content of 20% is 15 g / m ² on one side in terms of solid content. Was applied with an air knife coater. This was used as the ink absorption layer 7. The above laminated film was thermocompression-bonded to a protective layer 5 of a card made of acrylic resin (PMMA) and having a thickness of 0.2 mm, and then, on the track groove portion 2,
An optical card was obtained by bonding a transparent substrate 1 made of acrylic resin (PMMA) on which a polymethine dye optical recording layer 3 is formed and having a thickness of 0.4 mm, and an EVA hot melt adhesive layer 4 to each other. .

Although polyethylene terephthalate of the support 6 was thermocompression-bonded to the protective layer 5 in Example 1, the adhesive layer 8 may be interposed.

When printing was performed on the ink absorption layer of the obtained optical card by an inkjet recording method using a video printer RG601 (manufactured by Canon Inc.), clear and durable printing results were obtained without ink bleeding.

Example 2 An optical card having the layer structure shown in FIG. 2 was prepared as follows.

88 parts of a 10% dimethylformamide (hereinafter referred to as DMF) solution of polyvinylpyrrolidone (PVPK-90, manufactured by GAF) and 12 parts of a 10% DMF solution of novolak phenol resin (Restop PSK-2320, manufactured by Gunei Chemical Co., Ltd.) were mixed. The mixed solution gelled and a polymer complex was formed. When the mixed solution was heated to 90 ° C. while being stirred, it became a solution, which was used as a coating solution.

A polycarbonate film having a thickness of 400 μm (manufactured by Teijin Kasei Co., Ltd.) is used as the protective layer 5 of the card, and the coating solution having the above composition is applied onto the film to give a film thickness after drying of 8 μm.
Coating by the bar coater method so that
It was dried under the condition of minutes to form the ink absorbing layer 7, and the laminated card base material of the present invention was obtained.

The card base material of the present invention thus obtained was bonded to the transparent base material 1 via the adhesive layer 4 in the same manner as in Example 1 to obtain an optical card.

When printing was performed on the ink absorption layer of the obtained optical card by an inkjet recording method using a video printer RG601 (manufactured by Canon Inc.), there was no bleeding, and clear and durable printing results were obtained.

The optical characteristics of Examples 1 and 2 were not different from those of the conventional optical card in which the ink absorption layer 7 was not provided.

EFFECTS OF THE INVENTION The present invention provides a protective layer of an optical recording medium and an ink absorbing layer for an inkjet recording method, which is laminated on the protective layer.
It is possible to apply a printed record similar to the paper or the special film of the ink jet recording member to the optical recording medium.

Further, according to the present invention, since the applied ink is absorbed by the ink absorbing layer, the ink is distributed not only in the ink applying portion on the surface of the ink absorbing layer but also in the thickness direction of the ink absorbing layer. It is possible to prevent tampering with.

This enables the application of video printers to record facial photographs, landscapes, etc. on the optical card in that case, collating with the owner of the optical card, preventing tampering, and designing as you wish. This will promote the use of cards such as giving them.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an optical card of Example 1 and FIG.
The figure is a schematic sectional view of an optical card of Example 2. 1 ... Transparent base material, 2 ... Track groove portion 3 ... Optical recording layer, 4 ... Adhesive layer 5 ... Protective layer, 6 ... Support 7 ... Ink absorption layer, 8 ... Adhesive layer

Claims (4)

(57) [Claims] 1. An optical recording medium in which an optical recording layer and a protective layer are laminated in this order on a substrate, and ink jet recording is performed on the surface of the protective layer opposite to the side facing the optical recording layer. An optical recording medium having an absorption layer capable of absorbing ink applied by the method. 2. An optical recording medium in which an optical recording layer and a protective layer are laminated in this order on a substrate, and ink jet recording is performed on the surface of the protective layer opposite to the side facing the optical recording layer. Printing is performed by having an absorbing layer capable of absorbing the ink applied by the method, and by adhering the ink to the surface of the ink absorbing layer by an inkjet recording method and absorbing the ink in the ink absorbing layer. An optical recording medium characterized by the above. 3. A method for printing on the surface of an optical recording medium in which an optical recording layer and a protective layer are laminated in this order on a substrate, wherein the protective layer is provided on the side opposite to the side facing the optical recording layer. An optical recording medium provided with an ink absorbing layer capable of absorbing the ink used in the inkjet recording method on the surface is prepared, and the ink is attached to the surface of the ink absorbing layer by the inkjet recording method, and the ink is applied to the ink absorbing layer. A method for printing an optical recording medium, which comprises absorbing and printing. 4. An optical recording layer and a protective layer are provided in this order on a substrate, and ink applied by an inkjet recording method is absorbed on the surface of the protective layer opposite to the side facing the optical recording layer. A method for producing an optical recording medium having an ink absorbing layer as described above, wherein the ink absorbing layer is formed on the surface of the protective layer by coating.