JPH0740687A - Information recording card - Google Patents

Abstract

PURPOSE:To make an information recording part formed on a card substrate easily separable after it is used and reuse the card substrate, by a method wherein the information recording part is provided on at least one surface of the card substrate through a decomposable layer comprised of a decomposable material. CONSTITUTION:This information recording card 1 is provided with a card substrate 10 forming a card main body and an information recording part 15 provided on the card substrate 10 through a decomposable layer 13. The card substrate 10 is formed of a plastic material made from polyester and polystyrene. The decomposable layer 13 is formed of the decomposable material so that the information recording part 15 can be peeled off easily from the card substrate 10 and decomposable plastic such as decomposable polyethylene resin or decomposable polypropylene which is decomposable by light or a microbe is used. The information recording part 15 may be good if it is capable of performing record.reproduction of information and a bar code or a magnetic recording layer are used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording card such as a so-called disposable prepaid card typified by a telephone card, a shopping card, a cash card, a facility use card, etc., and particularly to a card base and information after use. The present invention relates to an information recording card that can be easily separated from a recording unit and that can reuse a card base.

[0002]

2. Description of the Related Art Recently, information recording cards such as prepaid cards and cash cards have been used for various purposes, which is said to be 100 million total card era. Among them, a prepaid card such as a telephone card, a shopping card, a facility use card, etc. is generally a plastic disposable card and stores a predetermined fixed amount of money.

Generally, a magnetic recording layer is often used in the information recording section. For this magnetic recording layer, for example, a transferable magnetic transfer sheet is used, and only the magnetic recording layer is transferred onto a card substrate. It is formed. The magnetic recording layer transferred and formed in this manner is particularly effective in preventing forgery because it does not have a so-called base material layer and is difficult to peel off.

Such a card is discarded after the valid period has passed or after a predetermined amount of money has been used, and is incinerated or landfilled.

However, in the case of incineration, if the substrate is plastic, a large combustion energy is generated, which causes damage to the incinerator, and in the case of landfill, the plastic substrate remains in the ground in its original form without being decomposed. So
There was a problem that the ground of the landfill was not stable.

[0006]

By the way, in recent years, the demand for effective use of resources is increasing, and in consideration of the above-mentioned various problems, it is considered to collect and reuse the card without disposing of it. Has been. However, in the used card collected, for example, when there is an information recording part formed by using a transfer sheet or by printing, it is difficult to remove these transferred or printed information recording parts, There was a problem in reusing the card substrate.

The present invention has been made in view of the above circumstances, and an object thereof is to easily separate an information recording portion formed on a card base after use and to reuse the card base. It is to provide an information recording card that enables

[0008]

In order to achieve such an object, the information recording card of the present invention comprises a card base forming the main body of the card and at least one surface of the base made of a decomposable material. And an information recording section formed via a degradable layer.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic perspective view showing an example of the information recording card 1 of the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG.

As shown in these figures, the information recording card 1 is provided with a card base 10 which constitutes the main body of the card, and an information recording portion 15 provided on the card base 10 with a decomposable layer 13 interposed therebetween.

The card substrate 10 used in the present invention is made of an ordinary plastic material because it is intended for recycling. Specifically, various known resins such as polyester, polystyrene, polycarbonate, vinyl chloride, polypropylene, ABS resin, polyethylene, polyamide, polyimide, fluororesin, melamine resin, and acrylic resin are used.

The thickness of such a card substrate 10 is usually about 50 μm to 3 mm.

A decomposable layer 13 is provided on such a card substrate 10. The degradable layer 13 is made of a degradable material so that the information recording portion 15 provided thereon can be easily peeled from the card substrate 10.

As the degradable material, a degradable plastic can be mentioned first.

As the degradable plastic, a polyolefin resin such as degradable polyethylene resin or degradable polypropylene, polyvinyl alcohol or degradable polyester is used. A degradable polyolefin resin is a resin that contains polyolefin as a main component and can be decomposed by light or microorganisms.

Among the decomposable polyolefin resins, examples of photodegradable ones include copolymers of ethylene and carbon monoxide. It is said that this ethylene / carbon monoxide copolymer is decomposed by cleavage between the second and third carbons bonded to the carbonyl group by light. The decomposition rate can be controlled by the content of carbon monoxide in the copolymer. Usually, the density of ethylene / carbon monoxide copolymer is about 0.89 to 0.95 g / cm ³ , and the content of carbon monoxide is about 0.1 to 10 mol%.

The ethylene / carbon monoxide copolymer as described above is obtained by, for example, adding ethylene and carbon monoxide at a temperature of 230 ° C.
It can be produced by coexisting under a pressure of about 2000 atm.

As the photodegradable decomposable polyolefin resin, polyethylene (density 0.870 to 0.950) is used.
g / cm ³ , melting index (MFI) 0.4 to 40) and polypropylene (density 0.880 to 0.910 g / cm ³ ,
It is also possible to use a mixture of a melting index (MFI) of 0.2 to 50) and an organic acid metal salt. As the organic acid metal salt,
There are iron stearate, cerium stearate, cobalt stearate, etc., and the mixing amount of the organic acid metal salt is 1 to 500.
About 0 ppm is preferable. Further, a copolymer with vinyl ketone may be added.

Of the decomposable polyolefin resins,
Biodegradable ones include mixtures of polyolefins with polycaprolactone, starch and microbially polymerized polyesters.

The polyethylene used for the biodegradable polyolefin resin has a density of 0.900 to 0.950 g.
/ Cm ³ , ethylene homopolymer having a melting index (MFI) of 0.4 to 40, or a random or block copolymer with other olefins such as propylene, hexene, octene and 4-methylpentene-1, and further Copolymers with monomers having an ethylenically unsaturated group such as vinyl acetate, acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, methyl methacrylate and maleic anhydride,
Examples thereof include polypropylene, a copolymer of propylene and ethylene, and butene.

The polycaprolactone used for the biodegradable polyolefin resin is obtained by ring-opening polymerization of ε-caprolactone, and its weight average molecular weight (Mw) is
Usually, it is about 40,000 to 100,000. Starch is a polymer of D-crucose, which is industrially produced from the stems and roots of potato, sweet potato, corn, and flour, and has a weight average molecular weight (M
w) varies from tens of thousands to tens of millions depending on the raw material and manufacturing method. The average particle size of such starch is preferably 10 μm or less.

As the polyester polymerized by microorganisms used for the biodegradable polyolefin resin, a random copolymer polyester of 3-hydroxybutyrate and 3-hydroxyvalerate (for example, hydrogen produced by ICI of England) is used. Examples thereof include those obtained by supplying propionic acid to bacteria) and polyesters mainly composed of 3-hydroxybutyrate obtained by supplying valeric acid to hydrogen bacteria.

The biodegradable polyolefin resin as described above is mixed with polycaprolactone, starch and polyester polymerized by microorganisms in an amount of 5 to 80% by weight based on 100% by weight of the total amount of polyethylene and the above-mentioned mixed components. Is preferred. If the mixing amount of each of the above components is less than 5% by weight, microbial degradability is insufficient, and if it exceeds 80% by weight, the strength is weakened.

Two or more kinds of each component of polycaprolactone, starch, and polyester polymerized by microorganisms may be used, but in that case, the total mixing amount is 5 to 5.
It may be in the range of 80% by weight.

By using the above-mentioned photodegradable polyolefin resin as a raw material for the microbial degradable polyolefin resin, a degradable polyolefin resin having both photodegradability and microbial degradability can be obtained.

Examples of the degradable polyester include the above-mentioned polycaprolactone and a random copolymer polyester of 3-hydroxybutyrate and 3-hydroxyvalerate which are polymerized by a microorganism. Furthermore, polyesters composed of dicarboxylic acid and diol and polyesters composed of polylactic acid are also suitable. Vinyl alcohol has a molecular weight of about 5,000 to 100,000 and a saponification degree of 9
It is preferably 9 mol% or more.

In addition, in order to increase strength, such decomposable resin contains calcium carbonate, magnesium carbonate,
Metal salts such as calcium sulfate, calcium sulfite, barium sulfate, magnesium sulfate, silicic acid or kaolin,
A silicate such as talc, a metal oxide such as titanium oxide and zinc oxide, and an inorganic filler such as aluminum compound such as aluminum hydroxide and alumina may be contained. Further, various additives such as an antioxidant, a decomposition accelerator, a stabilizer, an antistatic agent and a surfactant may be contained.

In addition, various kinds of the above decomposable plastics may be appropriately combined to form various laminated structures. Further, in order to increase the decomposition rate at the time of recycling, it is also a preferable embodiment to mainly use a water-soluble material or a hydrolyzable material, to reduce the molecular weight, or to shorten the ethylene chain.

Paper may be used as another degradable material. Generally, the material of paper itself is pulp,
Although fillers, sizing materials, paper strengthening agents, and dyes are used, from the viewpoint of degradability, 100% pulp paper,
Those composed of pulp + filler (clay, talc, etc.) and pulp + filler + paper-strengthening agent (starch, etc.) are very suitable.

The thickness of such a decomposable layer 13 is 0.1.
The thickness is about 100 μm, and the information recording unit 15 is provided on this. This form can be variously modified depending on the shape of the information recording portion formed above.

The information recording section 15 in the present invention is not particularly limited as long as it can record and reproduce information. In addition, although the stripe shape is illustrated in the present embodiment, it is not particularly limited to this form. For example, various known types such as a bar code shape and a special pattern shape are adopted.

When the information recording section 15 is a magnetic recording layer,
For example, γ-Fe ₂ O ₃ , Co deposited γ-Fe ₂ O ₃ , Fe
₃ O ₄ , Fe-Cr, Fe-Co, Co-Cr, Co-
Ni, Ba-ferrite, Sr-ferrite, CrO ₂
A magnetic recording layer can be formed by applying a dispersion in which a magnetic material such as is dispersed in a suitable resin or ink vehicle according to a known application method such as a gravure method, a roll method, a knife edge method, or the like. . In addition, Fe,
The metal or alloy such as Fe-Cr, Fe-Co, Co-Cr, or the oxide thereof can be used to form the magnetic recording layer by a vacuum deposition method, a sputtering method, a plating method, or the like.

Further, as the information recording section 15, a thermosensitive recording layer,
Known recording means such as a heat-sensitive rewrite layer, an optical recording layer, and a hologram layer can be formed. Of these, the heat-sensitive recording layer can be appropriately selected from known recording means such as heat-sensitive transfer (sublimation transfer type or melt transfer type), heat-sensitive color development and heat-sensitive destruction according to the purpose of use. Further, the heat-sensitive rewrite layer may be one that can stably record and erase by heating. Specifically, at least one aliphatic carboxylic acid selected from aliphatic monocarboxylic acids and aliphatic dicarboxylic acids and an organic low molecular compound having a polyoxyethylene chain are dispersed in a matrix material made of a resin. Examples thereof include those prepared, and those containing a liquid crystal substance in the film forming polymer substance.

Further, the above-mentioned information recording section 15 may be of a type that is transferred and attached onto the degradable layer 13 as a transfer layer of a transfer sheet.

Further, the above-mentioned information recording portion 15 may be a printed layer of a transferred pattern or the like. In this case as well, the printing layer is formed on the degradable layer 13. The printed layer such as a transferred pattern is formed by adding a pigment of each color to a binder such as a cellulose resin, a polyester resin, a vinyl chloride resin, a polyurethane resin, or a polystyrene resin, and if necessary, a plasticizer and a stabilizer. It can be formed by a known coating method or printing method using a colored coating material or ink which is sufficiently kneaded with a solvent or a diluent after adding an agent, a wax, a drying agent, a curing agent, a thickening agent and the like.

In such an information recording card 1, since the information recording portion 15 is formed on the card substrate 10 via the degradable layer 13, the information recording is performed by disassembling the degradable layer 13 at the disposal stage after use. The portion 15 can be peeled and removed, and it becomes easy to collect only the card base 10. As an example of decomposition of the decomposable layer 13 in this case, for example, the decomposable layer 13 is formed of a photodegradable resin, and the degradable layer 13 is exposed to light from the card substrate 10 side or the information recording unit 15 side. It is possible to accelerate the decomposition by irradiating the substrate with the light to accelerate the decomposition of the degradable layer 13.

In the above example, the information recording portion 15 has a stripe shape, but the present invention is not limited to this, and it may be formed in a predetermined pattern, or the card substrate 1 may be formed.
It may be formed on the entire surface of 0. Further, as described above, the information recording unit 15 may be a barcode, an OMR character, or the like. Further, it goes without saying that an overprint layer may be provided on the information recording section 15.

[0039]

As described in detail above, the information recording card of the present invention has a card base body which constitutes the main body of the card and a degradable layer made of a degradable material on one surface of the substrate. Since the information recording section is formed, the information recording section formed on the card base through the decomposable layer can be peeled off from the card base by the decomposition of the decomposable layer. Therefore, in such an information recording card, it becomes easy to recover only the card base by disassembling the decomposable layer at the disposal stage after use, and the card base can be reused.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an example of an information recording card 1 of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Information recording card 10 ... Card base | substrate 13 ... Degradable layer 15 ... Information recording part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B32B 27/10 8413-4F G06K 19/00

Claims (1)

[Claims] 1. An information recording device comprising: a card base body that forms the main body of a card; and an information recording portion formed on at least one surface of the base material with a degradable layer made of a degradable material interposed therebetween. card.