JPH1125519A - Recyclable optical card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the recyclable optical card in which the environmental safety is maintained even though it is burned, the processability is high and the durability is maintained at high temperature. SOLUTION: The card has a transparent substrate 5, which is provided on the illuminated side of the light beams that conduct a recording and a reproducing of information, an optical recording layer 3, in which a recording and a reproducing of the information are conducted, and back supporting members 1, 1' and 1" that are provided on the surfaces of the side in which no illumination takes place by the light beams. The members 1, 1' and 1" are made of the material which includes 30 to 95 weight % polycarbonate resin and does not include polyvinyl chloride resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium provided with optical recording means, and more particularly to an optical card having a card form, and more particularly to an optical card excellent in recyclability, environmental safety and workability.

[0002]

2. Description of the Related Art Optical recording media for optically recording information include:
Since high-density information recording is possible, the portability is excellent, and the recorded information is hardly deteriorated, the demand for the information is increasing more and more with the progress of the information society in recent years. Among these optical recording media, disposable optical cards are expected to expand their markets because of their high convenience.

[0003] Such an optical card is generally made of a transparent base material,
It has a structure in which an optical recording layer and a backing substrate are laminated.
Of these, a polycarbonate resin is often used as a material for the transparent base material because of its excellent optical characteristics, and a material for the backing base material is polyvinyl chloride because it is easy to print and process and is inexpensive. Resin (PVC) is often used.

[0004] However, when recycling an optical card containing PVC, there are problems in terms of environmental measures such as a problem that the recycling yield is low, or chlorine gas is generated when incinerated. Further, since PVC has a softening temperature of about 50 ° C., it is inferior in preservability in a high-temperature environment, for example, it cannot be stored in a car under hot weather.
Usage environment may be restricted.

Among these problems, the use of a polycarbonate resin as a backing substrate has been studied as a means for improving the recyclability and high-temperature environment resistance of an optical card. In this case, although it is more expensive than PVC, it is also advantageous in that it has excellent shape stability.

However, when a polycarbonate resin having high heat resistance is used, the processability of press laminating or the like used for card processing is reduced, and printing and card construction are restricted, so that it is difficult to produce a desired card. There is a point. For example, in the case of printing on a backing base material, an optical card having a configuration in which a transparent sheet having abrasion resistance is overlaid on the printed surface and thermally laminated, when a polycarbonate resin is used for the backing base material and the transparent sheet, In addition, it is necessary to set the heat lamination temperature to a high temperature of about 200 ° C. Further, since the fusion temperature is narrow and sharp, it is difficult to form a stable sheet by the heat lamination. Even in such a case, lamination at a low temperature is possible by providing the adhesive layer, but providing the adhesive layer is not preferable because it complicates the process.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to an optical card which solves the above-mentioned problems, that is, an optical card which is easy to recycle, has high environmental safety even when incinerated, and has a high quality in manufacturing optical cards. Excellent workability,
Further, it is an object of the present invention to provide an optical card excellent in storability under a high-temperature environment such as in a car under a hot summer day.

[0008]

Means for Solving the Problems The inventors of the present invention have continued to study the materials constituting the optical card. As a result, the backing substrate is made of a polycarbonate resin at a specific ratio and a polyvinyl chloride resin is used. It has been found that by not having such an optical card, an optical card having excellent recyclability, environmental safety, processability, and high-temperature preservability can be provided.

Therefore, the optical card according to the present invention comprises a transparent base material provided on the light irradiation side for recording and / or reproducing information, an optical recording layer for recording and / or reproducing information, and An optical card having a backing substrate provided on a surface on which light is not irradiated, wherein the backing substrate contains 30 to 95% by weight of a polycarbonate resin and does not contain a polyvinyl chloride resin. It shall be.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the optical card of the present invention will be described in more detail. Backing substrate In the optical card of the present invention, polycarbonate resin 3
By blending 0 to 95% by weight of a polycarbonate resin with a resin that can be kneaded well and using it as a backing substrate, the above-mentioned required characteristics can be satisfied. When the content of the polycarbonate resin is less than 30% by weight, heat resistance, dimensional stability, or impact resistance is poor. When the content is more than 95% by weight, a high temperature of about 200 ° C. is required for fusion bonding, which is not preferable. Preferably, the polycarbonate resin is 40
To 60% by weight.

The resin to be blended with the polycarbonate resin is not particularly limited as long as the alloy after the blending can be molded, and any compatible or incompatible resin can be used. In order to enhance compatibility, an additive such as a compatibilizer may be used as an optional component, and a coloring pigment may be used.

Preferred resins are, for example, ABS,
AS, PS, PMMA, PBT, AES, PA, PE
T, PO, SMA, TPU, or derivatives thereof, among which more preferred resins are ABS, AS, P
BT, PET or derivatives thereof, and even the most preferred resin is ABS.

A preferable resin mixing ratio is, for example, when the ABS resin is blended with the polycarbonate resin (PC), PC: ABS = about 6: 4 to 4: 6 by weight.

The softening temperature of the polycarbonate resin / blend resin alloy is not particularly limited as long as it can be thermally fused to the transparent sheet. However, in consideration of discoloration of the printing ink due to heat during thermal fusion, the softening temperature is 180 ° C. or less. Softening temperatures are preferred. Also, to satisfy the heat resistance of the optical card, 10
A softening temperature of 0 ° C. or higher is preferred.

As a method of forming the backing substrate, for example, a method such as hot pressing, heat laminating, or injection molding can be used. Further, as a molding method of the optical card, for example, a method such as lamination bonding using a urethane resin, an epoxy resin, or an acrylamide resin can be used. Transparent Substrate The transparent substrate constituting the optical card of the present invention is not particularly limited as long as it transmits light for recording and / or reproducing information and can maintain the shape of the optical card. A preferred material is a polycarbonate resin. In this case, the ratio of the polycarbonate resin in the optical card increases, and the recyclability of the optical card also increases. Optical Recording Layer The optical recording layer constituting the optical card of the present invention is not limited as long as information can be recorded and / or reproduced by a light beam. Generally, near-infrared rays are used as light rays, but the optical recording layer of the present invention is not limited to that,
Recorded and / or by electromagnetic radiation in general in the broad sense of light
Alternatively, any device that can be reproduced may be used. In the optical recording layer,
A light-reflective metal oxide film such as a silver salt-based, Te, Sb, or Mo oxide, or an organic thin film such as a cyan-based, quinone-based, or phthalocyanine-based film can be used. When recycling the optical card, the optical recording layer can be removed and removed by a physical-chemical method such as peeling (separation), polishing, or solvent removal. Other Layers The optical card of the present invention may further have a concave / convex pattern layer for optical recording, a protective layer for protecting the optical card surface and adjusting its appearance, or an adhesive layer, if necessary. Recycling methods Optical card recycling methods can be broadly divided into material recycling, in which resin is collected, melted and reused,
There is thermal recycling that uses resin to burn heat.

[0016] To recover the resin in the material recycling, for example, a method in which the transparent sheet of the optical card and the backing substrate are peeled off, the exposed optical recording layer is washed and removed with a solvent, and the resin alloy is separated by chemicals. , Heat and melt used optical cards to remove metallic impurities,
A method for separating a resin alloy can be used. Further, the obtained resin may be decomposed into raw material monomers and repolymerized. After the resin thus obtained is washed and pulverized, it can be reused as a recycled pellet, for example, for an optical card backing substrate or for other uses (low-function, low-cost use). In the case of material recycling, a compatibilizer and a resin pellet suitable for the combination of the resin to be recycled, for example, GR-10, GR-
20 (Bennet) may be used. The optical card of the present invention has such a high material recycling efficiency.

As a thermal recycling method that uses the amount of heat at the time of resin incineration as an energy source, for example, a method of molding a resin together with paper, wood, or the like to obtain a solid fuel, heat,
A method of decomposing with a catalyst and using it as a liquid or gas fuel is exemplified. The heat of combustion obtained from such things is
It can be used as energy such as electric power, steam and hot water. The optical card of the present invention is less likely to cause environmental pollution in such thermal recycling.

Among such recycling methods, as a recycling method of the present invention in which alloys, laminates, and the like are combined, reuse as alloys or thermal recycling is more suitable.

[0019]

1 shows an optical card of the present invention and a method of manufacturing the same.
This will be described with reference to FIG.

The optical card shown in FIG. 1 is an example of the optical card of the present invention. The optical card is a backing substrate of a transparent sheet made of a polycarbonate resin in order from the back side (the side on which the recording and / or reproducing light beam is not irradiated). 1, a backing substrate (support) 1 ', which is an opalescent sheet made of an alloy of polycarbonate / blend resin, a backing substrate 1 "of a transparent sheet made of polycarbonate resin, an adhesive layer 2, an optical recording layer 3, an uneven pattern layer 4, a transparent substrate 5 made of polycarbonate resin and a protective layer 6 made of acrylic resin.

The manufacture of this optical card was performed as follows.
Backing substrate 1 '(Polycarbonate resin: ABS resin =
1: 1 (weight ratio), containing white pigment, thickness 350 μm), and backing substrates 1 and 1 ″ (both polycarbonate resin, thickness 50 μm) were stuck on both sides,
Hot pressing was performed at 160 ° C. for 20 minutes at a pressure of 20 kgf / cm ² to form a backing substrate.

On the other hand, a protective layer (two-layer structure, 25 + 5 μm thickness) mainly composed of an acrylic resin is formed on a transparent substrate (370 μm thickness) made of a polycarbonate resin, and an uneven pattern layer made of an acrylic resin is formed on the opposite surface. Is formed, and then the optical recording layer (acrylic resin and TeO
x, a total thickness of 20 μm) and integrated from the optical recording layer to the protective layer.

The backing substrate and the integrated one from the optical recording layer to the protective layer were bonded together with an adhesive (urethane resin, thickness 30 μm).

The proportion of the polycarbonate resin in this optical card was 70% by weight.

When the temperature of the optical card reached 60 ° C., the card was not warped even if left for, for example, 10 minutes or more, and there was no problem in optical recording and / or reproduction.

In the material recycling of the optical card, pulverized as polycarbonate / ABS alloy,
After being made into a regenerated pellet, it was reused as a card backing substrate. 90% efficiency in material recycling
Met. Even if the optical card thus manufactured was burned for thermal recycling or the like, no chlorine gas or chlorine-based gas was generated.

The optical card manufactured in this way satisfies various physical characteristics required for the optical card, both for the initial product (virgin product) and the recycled product.

Next, as a comparative example, a test was conducted in the same environment as described above except that the backing substrate was PVC. As a result, the card was warped, and optical recording and / or reproduction could not be performed due to poor focus. The efficiency in material recycling was 70%. Since hydrogen chloride gas was generated during incineration, it was not preferable for the environment.

[0029]

According to the present invention, an optical card excellent in environmental safety, recyclability and processability can be provided. Further, according to the present invention, an optical card configuration in which a protective sheet is laminated on the printing surface of the backing substrate can be provided, and a card having excellent wear resistance can be provided. In a preferred embodiment of the present invention, the transparent base material is a polycarbonate resin, and the main component of the backing base material is a polycarbonate resin having a high softening temperature, so that the heat resistance of the optical card is improved. Use is also possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an optical card of the present invention.

[Explanation of symbols]

 1, 1 ', 1 "Backing substrate 2 Adhesive layer 3 Recording layer 4 Uneven pattern layer 5 Transparent substrate 6 Protective layer

Claims (6)

[Claims] 1. A transparent substrate provided on a light irradiation side for recording and / or reproducing information, an optical recording layer on which information is recorded and / or reproduced, and a surface on which the light is not irradiated. An optical card comprising: a backing substrate provided on the optical card;
An optical card comprising a weight percent and not containing a polyvinyl chloride resin. 2. The composition according to claim 1, wherein said backing substrate has a resin content of 40 to 60% by weight.
The optical card according to claim 1, wherein is an polycarbonate resin. 3. The method according to claim 1, wherein the backing substrate is made of ABS, AS, PS,
PMMA, PBT, AES, PA, PET, PO, SM
3. The optical card according to claim 1, comprising one or more resins selected from A and TPU. 4. The backing substrate is made of a polymer alloy of a polycarbonate resin and an ABS resin.
The optical card according to claim 1. 5. The softening temperature of the backing substrate is 100 to 1
The optical card according to any one of claims 1 to 4, wherein the temperature is 80C. 6. The optical card according to claim 1, wherein said transparent substrate is made of a polycarbonate resin.