JPH0740688A - Information recording card - Google Patents

Abstract

PURPOSE:To provide an information recording card which is excellent in the decomposability of the card substrate and being excellent in the record reproducing characteristics and which the cost can be reduced. CONSTITUTION:An information recording card 1 is constituted so that it is provided with a card substrate 10 provided with resin layers 11, 13 prepared on a paper base 12 and a part of at least one surface of the paper base 12 and an information recording part 15 prepared on the resin layers 11, 13, the resin layer is formed of decomposable plastic and its surface roughness Ra is 0.01-10mum.

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, and the like. Regarding recording cards.

[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.

[0003] By the way, in regard to the treatment of such a disposable card after use, inevitably, it depends on incineration or landfill, and plastic waste treatment is now being highlighted as a major social problem. That is,
The incineration process requires a high-heat-resistant furnace capable of withstanding a large amount of combustion energy of plastic waste, resulting in high treatment cost. Also, in the landfill process, the plastic material remains in the ground in its original form without being decomposed,
There is a problem that the ground of the landfill is not stable. Further, since the plastic material scattered in the ground is not decomposable, it remains as dust semipermanently, which poses a problem of damaging the environment.

In order to solve such a problem, the present applicant has already proposed to use a decomposable plastic material for the support of the card (Japanese Patent Application No. 3-202942, etc.).

[0005]

However, the use of degradable plastics inevitably leads to an increase in the cost of materials. Therefore, it is also possible to reduce the production cost by using paper together and to provide degradability. Conceivable. However, if only what is commonly called "paper" is used together, the degradability may not be sufficient, and
If the configuration that simply uses "paper" together is adopted, the surface smoothness cannot be said to be sufficient, and there may arise a problem that the reliability of recording and reproduction in the information recording portion formed on this is not sufficient.

The present invention was devised in view of such circumstances, and its purpose is to reduce the cost as well as the information which is excellent in the decomposability of the card substrate and the recording / reproducing characteristics. To provide a recording card.

[0007]

In order to achieve such an object, the present invention provides a card substrate provided with a paper base material and a resin layer provided on a part of at least one surface of the paper base material. And an information recording section provided on the resin layer, wherein the resin layer is made of degradable plastic and has a surface roughness Ra of 0.01 to 10
It was configured to be in the μm range.

[0008]

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 that forms the main body of the card, and an information recording section 15 provided thereon.

The card substrate 10 used in the present invention comprises a paper base material 12 and a resin layer 11 provided on one surface of the paper base material 12, and an information recording portion is provided on the resin layer 11. 15 are formed. Further, in this embodiment, the resin layer 13 is also formed on the other surface of the paper base material 12, and the paper base material 12 is sandwiched between the resin layers 11 and 13.

As the paper base material 12, for example, high-quality paper, medium-quality paper, low-quality paper, kraft paper, newsprint, glassine paper, base paper for impregnation, etc. are used. Generally, pulp, fillers, sizing materials, paper-strengthening agents, and dyes are used as materials for paper itself, but from the viewpoint of degradability, 100% pulp paper, pulp + fillers (clay, clay, Those composed of talc), pulp + filling material + paper strength agent (starch, etc.) are very suitable. In particular, when the content of pulp becomes high, the surface becomes rough and the surface smoothness becomes poor, so in order to improve the surface smoothness, calendering,
Alternatively, surface sizing using starch or casein may be performed.

The thickness of such a paper substrate 12 is 50 μm.
Approximately 1 mm. The surface roughness Ra of the paper substrate 12 is generally about 10 to 50 μm. The resin layer 11 formed on the paper base material 12 is made of degradable plastic.

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, photodegradable ones include copolymers of ethylene and carbon monoxide. It is said that this ethylene / carbon monoxide copolymer is decomposed by photocleavage between the second and third carbons bonded to the carbonyl group. 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 degradable 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-glucose, 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 the microorganism 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 amount of polycaprolactone, starch and polyester polymerized by microorganisms in the biodegradable polyolefin resin as described above is 5 to 80% by weight based on 100% by weight of the total amount of polyethylene and each of the above 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 this 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. Further, vinyl alcohol has a molecular weight of about 5,000 to 100,000 and a saponification degree of 99.
Those having a mol% or more are preferable.

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 decomposable plastics may be appropriately combined to form various laminated structures.

From the viewpoint of mechanical strength, those having a large molecular weight are desirable, and polycaprolactane and polyester are preferable.

Various suitable methods for forming the resin layer 11 include a coating method and the like. For example, a method of forming a decomposable plastic by extrusion coating on the paper base material 12 and the paper base material. A method of adhering and laminating a film made of degradable plastic on 12 is used. All of these are suitable means for improving the surface of the paper substrate 12 having poor surface smoothness.

The surface roughness Ra of the resin layer 11 thus formed on the paper substrate 12 is 0.01 to 10 μm, more preferably 0.01 to 1.0 μm. This value is
If it exceeds 10 μm, there arises an inconvenience that the recording / reproducing characteristics of the information recording portion 15 which will be described later formed on the resin layer 11 deteriorates, and making this value less than 0.01 μm causes only an economic disadvantage. There is no real benefit. The surface roughness Ra is measured according to JIS B0601.

The thickness of the resin layer 11 is 10 to 200 μm,
The thickness is more preferably 15 to 50 μm. This thickness is 1
If it is less than 0 μm, there is a disadvantage that the effect of improving the surface of the paper base material 12 having poor surface smoothness does not appear. Further, if this value exceeds 200 μm, the effect of improving the surface is already in a saturated state, and only the economic demerit is large, and there is no actual benefit. The thickness ratio of the resin layer 11 in the card substrate 10 is 5 to 50%.

An information recording portion 15 is formed on the resin layer 11 as described above.

The information recording section 15 is not particularly limited as long as it can record and reproduce information.
In the present embodiment, the information recording section 15 has a stripe shape, but the present invention is not limited to this, and the information recording section 15 may be formed in a desired pattern or may be formed on the entire surface of the card substrate. More specifically, the information recording unit 15
Is used as the magnetic recording layer, for example, γ-Fe ₂ O ₃ , Co
Deposition γ-Fe ₂ O ₃ , Fe ₃ O ₄ , Fe-Cr, Fe-
Co, Co-Cr, Co-Ni, Ba-ferrite, S
A magnetic recording layer is obtained by applying a dispersion prepared by dispersing a magnetic material such as r-ferrite or CrO ₂ in a suitable resin or ink vehicle according to a known application method such as a gravure method, a roll method or a knife edge method. Can be formed. In addition, Fe, Fe-Cr, Fe-Co, C
The metal or alloy such as o-Cr or its oxide can be used to form the magnetic recording layer by a vacuum deposition method, a sputtering method, a plating method or the like. Alternatively, a magnetic tape piece prepared in advance may be attached or formed on the resin layer 11. Alternatively, a magnetic transfer foil may be prepared and formed by a transfer method.

Further, as the information recording section 15, a heat sensitive 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. The recording characteristics of these recording layers are largely influenced by the surface smoothness of the surface on which the recording layers are formed, that is, the surface smoothness of the card substrate. For example, in the case of heat-sensitive destructive printing, if the metal thin film to be destroyed has irregularities, the sensitivity is significantly reduced, and also in the case of heat-sensitive rewrite printing, if the surface smoothness of the card substrate is large, the card substrate in the heat-sensitive rewrite layer is The behavior of the contacting parts becomes insufficient, resulting in poor reversibility. Similarly, in the case of an optical recording layer (for example, TeO _x thin film), the surface smoothness affects the recording sensitivity. Further, also in heat-sensitive color development and heat-sensitive transfer, surface smoothness similarly affects recording sensitivity and print quality. Further, since the degradable plastic forms a resin layer, it has good adhesiveness to these recording materials. In particular, polycaprolactone, polyesters, ethylene / co copolymers and the like have good adhesiveness to metal thin films.

By the way, it is preferable to form the resin layer 13 on the other surface of the paper base material 12. In this case, the material and thickness of the resin layer 13 are preferably the same as those of the resin layer 11. This is because curling can be prevented while ensuring decomposability. Further, it goes without saying that an overprint layer may be provided on the information recording section.

The present invention will be described in more detail below by showing specific examples. [Example 1] As a paper base material 12, a high-quality paper having a thickness of 140 µm was prepared, and resin layers 11 and 13 made of a copolymer of hydroxybutyric acid and valeric acid were formed on both surfaces thereof with a thickness of 30 µm.
It was formed by extrusion coating so as to obtain m. The surface roughness Ra of the resin layer 11 in this case was 0.5 μm.

Then, on the resin layer 11, an information recording portion 15 was formed as an information recording portion by applying and drying a magnetic coating material containing γ-Fe ₂ O ₃ to form an information recording portion 15. It was made. Example 2 A degradable plastic film having a thickness of 30 μm and composed of a polycondensate of a dicarboxylic acid and a diol was laminated on both sides of the paper substrate 12. Except for this, the information recording card of Example 2 was manufactured in the same manner as in Example 1. In this case, the surface roughness Ra of the resin layer 11 was 0.05 μm. [Embodiment 3] Each of the resin layers 11 and 13 has a thickness of 15 μm.
m. Except for this, the information recording card of Example 3 was produced in the same manner as in Example 1. The surface roughness Ra of the resin layer 11 in this case was 3.0 μm. [Comparative Example 1] Each of the resin layers 11 and 13 has a thickness of 1 μm.
And Except for this, the information recording card of Example 3 was produced in the same manner as in Example 1. The surface roughness Ra of the resin layer 11 in this case was 15 μm.

Examples 1 to 3 as described above, and
The recording / reproducing characteristics of the information recording card of Comparative Example 1 were evaluated as follows. (Recording / reproducing characteristics) For an information recording portion (magnetic film) of about 15 μm containing γ-Fe ₂ O ₃ , a magnetic recording head and a magnetic recording / reproducing apparatus having a magnetic reproducing head were used to
The recording / reproducing characteristics were evaluated at a frequency of 10 FRPI.

The results are shown in Table 1 below.

[0039]

[Table 1] As shown in Table 1, in Examples 1 to 3, the fluctuation rate of the output waveform and the noise characteristic were significantly improved.

[0040]

The effect of the present invention is clear from the above results. That is, the information recording card of the present invention comprises a card base having a paper base and a resin layer provided on a part of at least one surface of the paper base, and an information recording provided on the resin base. Part, the resin layer is formed of degradable plastic and has a surface roughness Ra of 0.
Since it is formed so as to have a thickness of 01 to 10 μm, not only cost can be reduced, but also the card substrate is excellent in decomposability, and the recording / reproducing characteristics and mechanical characteristics (tensile strength, folding endurance, etc.) are excellent. Produce an effect.

[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 11, 13 ... Resin layer 12 ... Paper base 15 ... Information recording part

Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location G06K 19/00 // C08L 101/00 LTB (72) Inventor Hirotaka Tsuchiya 1-chome, Ichigaya-Kagacho, Shinjuku-ku, Tokyo No. 1 Dai Nippon Printing Co., Ltd.

Claims (3)

[Claims] 1. A card base having a paper base and a resin layer provided on a part of at least one surface of the paper base, and an information recording device having an information recording unit provided on the resin layer. An information recording card, wherein the resin layer is formed of degradable plastic and has a surface roughness Ra of 0.01 to 10 μm. 2. The information recording card according to claim 1, wherein the resin layer is formed by extrusion coating degradable plastic on the paper base material. 3. The information recording card according to claim 1, wherein the resin layer is formed by laminating a film made of degradable plastic on the paper base material.