JPH0839745A - card - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a card which has mechanical properties equivalent to those of a polyester resin or a vinyl chloride resin, and which decomposes naturally even if left after being discarded. [Structure] By making the card base material a resin obtained by kneading a biodegradable resin and a filler, durability, rigidity, moldability, mechanical strength, hardness, impact strength, dimensional stability, resistance It has mechanical properties such as bendability, and has properties such as durability, bending resistance, water resistance, chemical resistance, waterproofness, surface smoothness, glossiness, and processability. Furthermore, it can be fully decomposed naturally even if it is left after disposal. A visible information / design portion, a magnetic recording portion, and a heat-sensitive recording layer can be formed as needed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card that is mainly used as a single-use type card such as a prepaid card or an entrance ticket. In particular, the entire card structure is biodegradable, and the bending resistance and rigidity associated with machine reading are improved. The present invention relates to a card having gate characteristics.

[0002]

2. Description of the Related Art Currently, cards are used in a wide variety of fields such as ID cards for proof of identity, membership cards, cash cards having a monetary value, credit cards, prepaid cards, commuter passes, and pass tickets. In particular, as a card which has been used most frequently, there is a so-called prepaid card (prepayment card) in which a fixed amount of money is paid in advance and the value information of the amount is recorded. This card has value information via a read / write device,
With this reading / writing device, the identification information is recorded as picture / character information printed or printed on the card base material and machine-readable information in the magnetic recording part or optical recording part provided on the card base material. In order to be used, mechanical properties called gate properties such as durability, bending resistance, and rigidity are required. As a material that satisfies such conditions and is easy to manufacture, generally, this prepaid card mainly uses a plastic such as polyethylene terephthalate (PET) resin, that is, a resin satisfying only mechanical properties as a card base material. ing.

Further, polyvinyl chloride resin is used as a base material for general cards such as ID cards, membership cards, cash cards and credit cards. These are usually cards that are sold or rented to the user and then discarded when the user finishes using the card. And the plastic card of the above-mentioned material is currently disposed of by incineration or landfill as waste after the treatment after use, but the plastic waste is high heat of combustion temperature due to incineration according to the latter material. It has problems of durability of incinerator due to liquefaction, pollution of combustion gas, etc., and it is impossible to completely separate it from the former material which is less affected by incineration. In the case of landfill as waste, it remains in its original form without being decomposed at the landfill site, and remains semi-permanently as waste, which has a problem of affecting the natural environment. In any case, there is a problem of disposal after use.

Cards using paper as a card substrate have been made and used in the past. Particularly, since paper can be easily discarded by incineration or landfill, and the manufacturing cost is low, the above-mentioned recent years have been made. It is considered to be the most suitable card material for solving the environmental issues such as the debate being discussed.

Further, JP-A-57-150393,
JP-A-59-220192, JP-A-51-939
As described in JP-A-91, JP-A-63-260912, and JP-A-57-150393, plastics that can be decomposed in the natural environment such as light or underground have been developed, and especially disposable products. Used for packaging,
Currently, some are commercialized. In the field of cards, JP-A-5-42786 and JP-A-5-85 by the present applicant
No. 088 describes the use of biodegradable or photodegradable plastic for the card substrate.

Further, Japanese Patent Application No. 5-14473 filed by the present applicant
There is a card provided with a biodegradable resin layer according to No. 8 on one side or both sides of a paper base material and having characteristics as a conventional plastic card and excellent disposability.

[0007]

However, when paper is used as a card substrate, a card having durability, bending resistance, water resistance, chemical resistance, waterproofness, surface smoothness, glossiness, workability, etc. Since the function is inferior in all respects considering its suitability as a paper, the use of paper alone is limited to temporary use such as passage ticket, admission ticket, ticket, and is used for a certain period of time. Not suitable for cards. In this case, it is possible to laminate an outer layer other than plastic such as synthetic resin such as polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate or aluminum foil on the paper base material as a protective layer, but these are not excellent in discardability, It has the drawback that it is not much different from the plastic cards mentioned above.

A card in which the card base material itself is made of degradable plastic is gradually disassembled after disposal due to the function of the plastic. However, this card is created in consideration of the convenience of the card itself and problems in manufacturing the card, and when a degradable plastic is simply used as the card base material, it has mechanical strength such as bending resistance and rigidity. It can not be said that it has characteristics, and since it is necessary to have a certain thickness from the strength and ease of use of the card, when it is integrally formed, warpage of the card surface and decomposition by the thickness Since the plastics that are used are used, it takes time to disassemble, and the plastics that have decomposability are expensive, so there is a problem that the card itself becomes expensive.

Further, a card provided with a biodegradable resin layer on one side or both sides of a paper base material for the purpose of improving the above-mentioned problem is not a problem in normal use, but is exposed to an abnormal environment such as water such as washing. If exposed, moisture may soak from the end surface of the card, causing curl, expansion and contraction of the card, curling of the edge, etc., and damage to the card, which causes it to get caught in the card transport path etc. when used as a reading / writing device. It had problems such as causing a failure. Therefore, an object of the present invention is to provide a card which has gate characteristics such as rigidity required for machine reading / writing and has a decomposability as a whole card structure.

[0010]

Means for Solving the Problems The present invention, which has been made to achieve the above object, is a biodegradable compound represented by the following general formula (I) having a number average molecular weight of 10,000 to 100,000. A card is characterized in that a base material is a resin layer formed by kneading a resin having: and a filler. (Chemical formula 1)

The invention according to claim 2 has a number average molecular weight of 2
A card having a resin layer obtained by kneading a biodegradable resin represented by the following general formula (II) of 5,000 to 70,000 and a filler as a base material (Chemical Formula 2).

The invention described in claim 3 is the card according to claim 1 or 2, wherein the resin layer is biaxially stretched.

According to a fourth aspect of the present invention, in the card according to the first or second aspect, a magnetic recording layer and / or a heat sensitive recording layer is formed on a resin layer. is there.

[0014]

According to the card of the present invention, when the filler is kneaded with the degradable plastic represented by the general formula (I) [Chemical formula 1] or the general formula (II) [Chemical formula 2], the card base material becomes durable. , Mechanical properties such as rigidity, moldability, mechanical strength, hardness, impact strength, dimensional stability, and bending resistance are maintained.
This allows machine reading / writing on read / write devices.
The gate characteristics for writing are shown. Furthermore, it can be fully decomposed naturally even if it is left after disposal.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a sectional view of a card 1 of the present invention, and FIGS. 2 and 3 show sectional views of a card according to another embodiment of the present invention.

The card 1 of the present invention shown in FIG.
As a main component of, a biodegradable resin composed of an aliphatic polyester represented by the general formula (I) [Chemical formula 1] or the general formula (II) [Chemical formula 2] is used. Have. Incidentally, polyesters are classified as aromatic due to their structure, and aliphatic polyesters are known to have degradability. (Story of biodegradable plastic, Japanese Standards Association p.59-p.66 1991)

The aliphatic polyester represented by the general formula (I) [Formula 1] is an aliphatic (including cycloaliphatic) glycol and an aliphatic (including cycloaliphatic) dicarboxylic acid (or an acid anhydride thereof). Is an aliphatic polyester having a urethane bond, which is obtained by polycondensing a polyester obtained by polycondensation of polyisocyanate in the presence of diisocyanate or polyisocyanate, and has a number average molecular weight of 10,000 to 100,000.
A general method for synthesizing this resin is described in JP-A-4-18982.
No. 2 publication.

The aliphatic polyester represented by the general formula (II) [Chemical Formula 2] is an aliphatic (including cycloaliphatic) glycol or a mixture thereof, and an aliphatic (including cycloaliphatic)
A dicarboxylic acid (or its acid anhydride) or a mixture thereof is an aliphatic polyester having no urethane bond and having a high molecular weight without using diisocyanate as a coupling agent, and has a number average molecular weight of 25,000. ~ 70,000. A general method for synthesizing this resin is disclosed in JP-A-4-122205.

Further, as a filler for the resin represented by the general formula (I) [Chemical formula 1] or the general formula (II) [Chemical formula 2], inorganic fillers such as calcium carbonate, mica, calcium silicate, white carbon, Asbestos, porcelain clay (fired), glass fiber, etc. are added, and the card material 2 is made of a resin material which is kneaded and processed into a sheet. The shape and size of the filler are not particularly specified, but when the filler is fibrous, the bending strength in the stretching direction is improved. This card substrate 2 has a conventional rigidity, moldability, mechanical strength, hardness, impact strength, dimensional stability, bending resistance, surface smoothness, glossiness, water resistance, chemical resistance, and waterproofness. It has the same characteristics as polyester and vinyl chloride materials.

The sheet-shaped card substrate 2 obtained by biaxially stretching this resin material has properties such as rigidity, moldability, mechanical strength, impact strength, dimensional stability, and bending resistance. improves.

The resin represented by the general formula (I) [Chemical formula 1] or the general formula (II) [Chemical formula 2] may be selected from various types as long as the characteristics of the resin are not lost. Additive,
For example, 0.05 to 3 parts by weight of anti-coloring agent, 0.
It is possible to add 05 to 3 parts by weight, a lubricant of 0.05 to 0.5 parts by weight, an organic pigment and an inorganic pigment.

The card substrate 2 of the present invention is produced by molding the thermoplastic polymer obtained as described above into a sheet by a known extrusion method, further biaxially stretching the sheet, and then calendering the sheet. To do. In addition to the single-layer structure for the card base material, sheets 12 and 13 made of the same material or resin materials having different characteristics are prepared respectively, and the card base material has a multi-layer structure like the card 11 shown in FIG. Good.

The same printing / processing method as in the case of the conventional paper / plastic card can be used for the card obtained as described above. A card is manufactured by printing the visible information / design part 3 such as characters and patterns by a printing method such as offset printing, screen printing or gravure printing on the card base material 2 and processing it into a card size using a punching machine. It

Further, an information recording layer such as the magnetic recording layer 4 shown in FIG. 1 or the heat sensitive recording layer 5 shown in FIG. 2 can be formed on the card of the present invention. The magnetic recording layer 4 and the heat-sensitive recording layer 5 can also be formed on the same card. In addition,
The method of forming the magnetic recording layer 4 is to apply a coating liquid in which a magnetic recording material is dispersed in a binder or the like, or to laminate sheets having the magnetic recording layer formed thereon. Similarly, the heat-sensitive recording layer 5 can be formed by a known heat-sensitive recording material, for example, a coating solution containing a heat-sensitive leuco dye, a heat-sensitive diazo dye or the like, or a low melting point metal thin film such as tin or aluminum.

Specific examples of the present invention will be described below in detail. <Example 1> The melt flow rate (MFR) of the resin used in the present invention is measured by JIS method K7210-1976.
Method A operation (manual cutting method) 4 (Test temperature 190
C., test load 2.16 kg, for polyethylene and polypropylene, etc.), the measurement data used was pellets or cut pieces dried in advance at 90 ° C. under vacuum for several hours.

The number average molecular weight of the resin used in the present invention was measured by the following GPC method. Measuring device: Shodex GPC SYSTEM-11
(Showa Denko KK) Eluent: HFIP (hexafluoroisopropanol) /
5mM CF ₃ COONa sample column: HFIP-800P and HFIP-8
0M × 2 lines Reference column; HFIP-800R × 2 lines Polymer solution: 0.1 wt%, 200 μl Operating conditions: Liquid flow rate 1.0 ml / min, column temperature 40 ° C.,
Pressure 30 kg / cm ² Detector: Shodex RI Molecular weight standard: PMMA (Shodex STA
NDARD M-75)

The general formula (I) measured by the above method
Number average molecular weight represented by [Chemical formula 1] 10,000 to 1,000
00 resin 60 wt% and mica 35 wt% (HAR16
0 Shiraishi Kogyo Co., Ltd.), 5 wt% of titanium oxide was kneaded by a vent type extruder, and then this was extruded by a T-die melt extruder at a processing temperature of 200 ° C. to a specified thickness, and then biaxially stretched,
Calendered to improve surface smoothness 1
A 88 μm sheet was obtained. This sheet has a flexural modulus of 4
It was 0000 kgf / cm ^2, and the characteristics close to those of the polyethylene terephthalate resin sheet were obtained.

A magnetic coating material having the following composition was formed on this sheet by knife coating to form a black magnetic recording layer having a thickness of about 10 μm, which was subjected to magnetic field orientation in a horizontal magnetic field of about 3000 gauss and then heated with hot air at 100 ° C. for 3 minutes. Dried. Magnetic paint Magnetic powder (1750 Oe: barium ferrite) 100 parts Vinyl chloride-vinyl acetate copolymer (VAGF: Union Carbide Co.) 20 parts Polyurethane resin (Nipporan 2304: Nippon Polyurethane Industry) 30 parts Hexamethylene diisocyanate (Coronate HX) : Nippon Polyurethane Industry Co., Ltd. 2 parts Carbon Black (# 3000: manufactured by Mitsubishi Kasei) 5 parts Dispersant (Garfuck RE-610: manufactured by Toho Kagaku Co., Ltd.) 3 parts Diluting solvent (toluene / MEK / MIBK) 100 parts

This sheet is 57.5 mm in length x 85.0 in width
A card 1 shown in FIG. 1 having a cybernet standard of mm was produced.
Read this card 1 When passing through a gate having a writing device at 2 m / sec, no abnormality occurred. After this card was immersed in water for 30 seconds, the water was wiped off and the card was passed through the gate in the same manner, but no abnormality occurred. The rigidity at this time was 25 gf / cm, and there was no change before and after immersion in water. Further, when this card 1 was embedded in field soil and the decomposition state was observed, after 6 months, the magnetic recording layer was left and the shape was not retained.

Table 1 shows an example in which the mechanical strength of the card base material of the example is compared with that of other members. This is JIS P
Based on 8125, the rigidity of the short side of the card (gf / c
m) was measured, and in the water immersion test, after immersion in water for 30 seconds, the water was wiped off for measurement. In addition, Comparative Example 1 is a biodegradable resin simple substance used in Examples,
Comparative Examples 2 and 3 are other biodegradable resins, 3-hydrobutyrate polymers, Comparative Examples 4 and 5 are paper base materials, and Comparative Example 5 is a water-immersed paper base material. .

[0031]

[Table 1]

Example 2 Vent-type extrusion of 50 wt% resin having a number average molecular weight of 10000 represented by the general formula (II) [Chemical formula 2], 35 wt% mica (manufactured by HAR160 Shiraishi Industry Co., Ltd.), and 10 wt% titanium oxide. After kneading with a machine, this is extruded with a T-die melt extruder at a processing temperature of 200 ° C. to a specified thickness, and then biaxially stretched and calendered to obtain a core sheet having a thickness of 560 μm with improved surface smoothness. It was made. Next, 60 wt% of a resin having a number average molecular weight of 10,000 to 100,000 represented by the general formula (I) [Chemical Formula 1] and 35 wt% of mica (HAR160 manufactured by Shiraishi Industry Co., Ltd.),
After kneading 5 wt% of titanium oxide with a vent type extruder, this is extruded with a T-die melt extruder at a processing temperature of 200 ° C. to a specified thickness, and then biaxially stretched and calendered to improve surface smoothness. A cover sheet having a thickness of 100 μm was prepared. Further, cover sheets 13 were laminated on both sides of the core sheet 12 to obtain a card 11 shown in FIG. The tensile strength of this card is 4.9 kg / mm ² , the softening temperature is 100 ° C, which is higher than that of vinyl chloride resin card,
Further, when it was immersed in liquid paraffin at 150 ° C. for 5 minutes, peeling between sheets did not occur, and as a whole, it showed the same or higher characteristics as the vinyl chloride resin card. In addition,
When this card 11 was buried in field soil and observed for decomposition, it was found that after 6 months, the magnetic recording layer was left and the shape was not retained.

[0033]

As described above, in the card of the present invention, by adding a filler to a resin having decomposability, rigidity, moldability, mechanical strength, hardness, impact strength, dimensional stability, and bending resistance are obtained. It has excellent mechanical properties such as
It has gate characteristics that can be used for writing machines, and even if this card is not incinerated at the time of disposal but left in the natural world, it can be biodegraded by microorganisms etc., so the environmental impact of disposal is reduced. Is what you can do.

Further, since the mechanical properties are excellent, the thickness of the biodegradable resin to be used, that is, the amount used, can be reduced, the manufacturing cost can be reduced, and moreover, it is almost the same as the case of using the conventional plastic. Since it has strength and durability, it can withstand use in the current applications such as single-use cards.

The biodegradable resin used in the card of the present invention is inferior to conventional plastics in physical properties and processability, but additives and non-degradable plastics do not deteriorate the degradability. It is also possible to improve the physical properties and workability by mixing

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a card of the present invention.

FIG. 2 is a sectional view showing another embodiment of the card of the present invention.

FIG. 3 is a sectional view showing another embodiment of the card of the present invention.

[Explanation of symbols]

 1, 10 and 11 cards 2 Card substrate 3 Visible information / design section 4 Magnetic recording layer 5 Thermal recording layer 12 Core sheet 13 Cover sheet

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B42D 15/10 501 A (72) Inventor Masayuki Taniguchi 1-5-1 Taito, Taito-ku, Tokyo Toppan edition In Printing Co., Ltd. (72) Inventor table Kiyotaka 1-5-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Toru Watanabe Toru Watanabe 3-20 Kandanishikicho, Chiyoda-ku, Tokyo Showa Polymer Within the corporation

Claims (4)

[Claims] 1. A card comprising, as a base material, a resin layer obtained by kneading a filler and a biodegradable resin represented by the following general formula (I) having a number average molecular weight of 10,000 to 100,000. Embedded image 2. A card comprising, as a base material, a resin layer obtained by kneading a filler and a biodegradable resin represented by the following general formula (II) having a number average molecular weight of 25,000 to 70,000. Embedded image 3. The card according to claim 1, wherein the resin layer is biaxially stretched. 4. A magnetic recording layer and / or a heat-sensitive recording layer are formed on the resin layer.
And the card according to claim 2.