JPH0740686A - Information recording card - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an information recording card in which disassemblability is taken into consideration by disassembling not only the card base material but also the information recording section, printing section, etc. formed thereon. . An information recording card, comprising: a card base forming a main body of the card; and an information recording section provided on the card base, wherein the card base includes a resin section, and the information recording section is a resin binder. And the resin portion of the card base and the resin portion of the card base are each made of degradable plastic.

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 contained in the card base and the information recording section. The present invention relates to an information recording card having a decomposable resin binder.

[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 the decomposable material in the conventional card is only a part centering on the card base material, and the degradability is not sufficiently taken into consideration.

The present invention was devised in view of such circumstances, and its purpose is to reconsider the disintegratability of the entire members constituting the card and to form not only the card base material but also the card base material. It is an object of the present invention to provide an information recording card in which disassembling property is taken into consideration by providing the information recording unit, the printing unit, etc. to be disassembled.

[0007]

In order to achieve such an object, the present invention provides an information recording card including a card base forming a card main body and an information recording section provided on the card base. Then, the card base is provided with a resin portion, the information recording portion contains a resin binder, and the resin binder and the resin portion of the card base are each formed of degradable plastic.

[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 which constitutes the main body of the card, and an information recording section 15 provided thereon.

In the case of this embodiment, the card substrate 10 used in the present invention is formed of a resin portion 11 as a whole, and the resin portion 11 is made of degradable plastic having degradability.

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 prepared, for example, by 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.

Among 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 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 mixing of the polycaprolactone, starch and the polyester polymerized by the microorganism 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 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 the polycaprolactone, the starch and the polyester polymerized by the microorganism 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 the 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.

An information recording section 15 is provided on such a card base 10 (resin section).

The information recording unit 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.

The information recording section 15 as described above contains a resin binder and a recording material, and the resin binder is made of decomposable plastic. The specific material of the decomposable plastic is the resin portion 1 of the card base 10 described above.
It is appropriately selected and used from the materials of No. 1.

When the information recording section 15 is a magnetic recording layer,
For example, γ-Fe ₂ O ₃ as a recording material, Co deposited γ-
_{Fe 2 O 3, Fe 3 O} 4, Fe-Cr, Fe-Co, C
A dispersion prepared by dispersing a magnetic material such as o-Cr, Co-Ni, Ba-ferrite, Sr-ferrite, and CrO ₂ in a suitable degradable plastic binder or ink vehicle (containing degradable plastic) is subjected to a gravure method and a roll. The magnetic recording layer can be formed by coating according to a known coating method such as a coating method or a knife edge method. Alternatively, a magnetic transfer foil may be prepared and transferred and formed.

Alternatively, a prefabricated magnetic tape piece may be attached to the resin layer 11 to form it.

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. In these cases as well, degradable plastic is used as the resin binder. For the heat-sensitive recording layer, a recording material 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, although not shown,
On the card base 10 or the information recording portion 15, a pattern is further drawn or a printing layer as a protective film is provided, and the resin binder contained in the printing layer is also made of the above-mentioned degradable plastic. It is preferably formed.

It is necessary that the binder of the magnetic recording layer has good wettability with respect to the magnetic powder and good dispersibility of the magnetic powder, and a polyester type, a polycaprolactone type, or a polyvinyl alcohol type is desirable.

Regarding the binder for the thermal recording material,
In the case of the thermal transfer printing method, a decomposable polymer having a melting point of about 60 to 100 ° C. (for example, a dicarboxylic acid / diol copolymer having a molecular weight of several thousand) is used as the material for the transfer ribbon. In the case of the heat-sensitive color printing method, the selection is made in consideration of the dispersibility of the leuco dye, the storage stability and the dispersibility of the color developer. As the layer in contact with the metal thin film used in the heat-sensitive destruction method or the optical recording material, polyester having high polarity is also used. As the matrix material used in the heat-sensitive rewrite method, a decomposable matrix that is incompatible with fatty acids and does not hinder phase separation is selected, and a material having a relatively large molecular weight and a high melting point is used in terms of heat resistance. As the protective layer, in consideration of heat resistance,
It has a high molecular weight and a high melting point, and additives such as talc and microsilica are added to it.

The resin binder contained in the information recording portion or the printing layer in the present invention includes a filler, a slipping agent, a binder which originally constitutes each layer, a resin which functions as a protective layer and an adhesive layer. It is a broad concept including.

Next, a modified example of the card base forming the main body of the card will be described with reference to FIG.

The card substrate 10 shown in FIG. 3 comprises a paper base material 12 and a resin layer 11 provided on one surface of the paper base material 12.
And the information recording portion 15 is provided on the resin layer 11.
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 resin layer 11 formed on the paper base material 12 is made of the above-mentioned decomposable plastic. 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.

The structure of the card substrate 10 has been described as two kinds, but the structure is not limited to this and various laminated structures can be adopted.

[0041]

The information recording card of the present invention comprises:
A card base forming a main body of the card; and an information recording section provided on the card base, the card base having a resin section, and the information recording section containing a resin binder,
Since the resin binder and the resin portion of the card base are each formed of degradable plastic, there is an effect that an information recording card having higher degradability can be provided.

[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.

FIG. 3 is a sectional view for explaining another sectional structure of the card base of the information recording card 1 of the present invention.

[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 Internal reference number FI Technical display location C08L 101/00 LTB G06K 19/00 (72) Inventor Hirotaka Tsuchiya 1-chome, Ichiya-Kagacho, Shinjuku-ku, Tokyo No. 1-1 Dai Nippon Printing Co., Ltd. (72) Inventor Atsushi Umezawa 1-1-1 Ichigayaka-cho, Shinjuku-ku, Tokyo Within Dai Nippon Printing Co., Ltd.

Claims (2)

[Claims] 1. An information recording card comprising a card base forming a main body of a card and an information recording section provided on the card base, wherein the card base includes a resin section, and the information recording section is An information recording card containing a resin binder, wherein the resin binder and the resin portion of the card base are each formed of degradable plastic. 2. A printing layer is further provided on the card substrate or on the information recording portion, and the resin binder contained in the printing layer is degradable plastic. Information recording card described in.