JPH0732775A - Card base material - Google Patents

Abstract

PURPOSE:To provide a card base material in which not only a cost can be reduced but also which has excellent degradability and a predetermined physical strength. CONSTITUTION:A card base material 1 comprises a resin layer 3 formed of a degradable plastic and provided partly on at least one surface of a sheet base material 2 or the degradable plastic of 10-25wt.% contained in the material 2, wherein low physical strength of the material 2 is supplemented by the degradable plastic to provide 5kg/mm<2> or more of a tensile strength and physical strength of 50 times or more of folding endurance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card base material, and more particularly to various management cards used in card form, numbered tickets, point cards, membership cards, ID cards, entrance / exit tickets, facility use cards, medical use. The present invention relates to card materials that can be used for medical records, insurance certificate, disposable cards such as telephone cards, shopping cards, prepaid cards such as cash cards, securities, and sheets.

[0002]

2. Description of the Related Art Conventionally, a paper base material or a plastic film base material has been used for cards and sheets, but the paper base material has insufficient physical strength such as mechanical strength. Although the material has sufficient physical strength, the treatment after use becomes a problem. Similarly, attempts have been made to laminate a plastic film on a paper base material or to coat the paper base material with plastic to supplement the physical strength of the paper base material, but the disposal stage after use is also a 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. Further, in the landfill process, the plastic material is not decomposed and remains in the ground as it is, so that the ground of the landfill site 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.).

[0004]

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
Even if the configuration of simply using "paper" together is adopted, there arises a problem that a predetermined physical strength, for example, various card specifications or prepaid card standards (JIS X6311) cannot be obtained.

The present invention was devised in view of the above circumstances, and its purpose is to reduce the cost and, at the same time, it is excellent in decomposability and has a predetermined physical strength. To provide.

[0006]

In order to achieve such an object, the present invention provides a paper base material and a resin layer formed of degradable plastic on at least one surface of the paper base material. And a tensile strength of 5 kg / mm ² or more and a folding endurance of 50 times or more.

Further, according to the present invention, the degradable plastic is contained in the paper base material in the range of 10 to 50% by weight, and the tensile strength is 5 kg / mm ² or more and the folding endurance is 50 times or more. did.

[0008]

The card substrate has a resin layer formed of degradable plastic on at least one surface of the paper substrate, or 10 to 5 of the degradable plastic is contained in the paper substrate.
The degradable plastic compensates for the low physical strength of the paper base material, and the tensile strength is 5 kg / mm ² or more and the folding endurance is 50 times or more. It has physical strength and facilitates disposal after use.

[0009]

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

FIG. 1 is a schematic sectional view showing an example of the card base material of the present invention. In FIG. 1, a card base material 1 includes a paper base material 2 and a resin layer 3 laminated on both surfaces of the paper base material 2.

Examples of the paper substrate 2 include high-quality paper, medium-quality paper, low-quality paper, modified paper, fine-modified paper, art paper, art post paper, gravure paper, roll paper, kraft paper, and thin imitation. Paper, indeer paper, machine coated paper, cast coated paper and the like can be used. Others, printing paper, broadcasting paper, thin paper, processed base paper, statistics card paper, blueprint paper,
Sulfuric acid paper, electric resistance paper, building material base paper, colored paperboard, white paperboard, chip ball, corrugated paper base paper, shoji paper, calligraphy paper, etc. can also be used.

In general, pulp, fillers, sizing materials, paper strengthening agents, and dyes are used as materials for the paper itself. From the viewpoint of degradability, 100 is used.
% Pulp paper, pulp + filler (clay, talc, etc.), pulp + filler + paper strength agent (starch, etc.) are very suitable. Judging from the physical strength of paper, it is desirable to use pulp with long fibers with high tensile strength and tear strength (softwood), and with a large amount of hemicellulose components. Fine particles of titanium dioxide (TiO ₂ ) are preferred. When the pulp content is high, the surface becomes rough and the surface smoothness becomes poor. Therefore, in order to improve the surface smoothness, calendering or surface sizing using starch or casein may be performed.

The thickness of such a paper substrate 2 is 50 μm to
It is about 1 mm.

The resin layer 3 formed on the paper base material 2 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 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.

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 the polycaprolactone, starch and 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 polycaprolactone, starch and polyester polymerized by microorganisms may be used, but in that case, the total mixing amount is 5-8.
It may be in the range of 0% 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 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 order to increase the strength of such decomposable resin, metal salts such as calcium carbonate, magnesium carbonate, calcium sulfate, calcium sulfite, barium sulfate and magnesium sulfate, silicic acid or kaolin, talc, etc. Metal oxides such as silicates, titanium oxides and zinc oxides, and inorganic fillers such as aluminum compounds 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 have various laminated structures.

A preferable method for forming such a resin layer 3 is, for example, a method in which a degradable plastic is extrusion-coated on the paper base material 2 to form the resin layer 3, and a degradable plastic is formed on the paper base material 2. A method of adhering and laminating a film made of is formed. All of these are suitable means for improving the surface of the paper base material 2 having poor surface smoothness.

From the physical strength, the above-mentioned degradable plastic has a molecular weight of 10,000 or more, preferably 10,000.
Set to 0 or more. The thickness of the resin layer 3 is 10 μm or more,
It is preferably 50 μm or more. Further, the decomposable plastic has a melting point of 60 ° C. or higher, preferably 100 ° C. or higher, and preferably has a high mechanical strength during formation. The ratio of the thickness of the paper base material 2 to the thickness of the resin layer 3 is 1/1 to
It is in the range of 20/1, preferably 5/1 to 10/1.
When the thickness of the resin layer 3 is thicker than the above range, the physical strength of the card base 1 is hardly improved and only the manufacturing cost is increased, while the thickness of the resin layer 3 is thinner than the above range. In that case, the physical strength as described later cannot be obtained.

The resin layers 3 formed on both sides of the paper base material 2
It is preferable to use the same material and the same thickness in terms of curl prevention, but the material is not limited to this. Alternatively, the resin layer 3 may be formed only on one surface of the paper base material 2.

FIG. 2 is a schematic sectional view showing another example of the card substrate of the present invention. In FIG. 2, the card substrate 11 is formed of a paper substrate 12 containing degradable plastic in the range of 10 to 50% by weight.

As the paper base material 12 used for the card base material 11, a paper base material usable for the card base material 1 described above is mixed with degradable plastic in the paper base material. An example is a paper base material impregnated with degradable plastic after papermaking.

The degradable plastic contained in the paper substrate 12 may be the degradable plastic as described above. The form of the degradable plastic contained in the paper base 12 may be such that the degradable plastic is contained as a sizing material. When the content of the degradable plastic in the paper base material 12 exceeds the above range, the physical strength of the card base 11 is hardly improved and only the manufacturing cost increases, while when the content is less than the above range, The physical strength as described later cannot be obtained.

The thickness of the above-mentioned card base materials 1 and 11 of the present invention can be about 100 μm to 2 mm. For example, a card base material of 180 to 290 μm for a prepaid card, 680 to 800 μm for a credit card, and 300 μm to 1 mm for a certificate is applied.

The card substrates 1 and 11 of the present invention as described above
Has a physical strength such that the tensile strength (JIS C2318) is 5 kg / mm ² or more and the folding endurance (JIS P8115) is 50 times or more. Therefore, a card using the card substrate 1
It does not easily wrinkle or tingle when carried, and has excellent durability that can withstand about 100 repetitions even during transportation during mechanical processing.

The present invention will be described in more detail below by showing specific examples. [Example 1] As a paper base material, a high-quality paper having a thickness of 130 µm and a tensile strength of 2 kg / mm ² was prepared, and a hydroxybutyric acid / valeric acid copolymerized polyester having a molecular weight of 200,000 was extrusion-coated on both surfaces of the paper to obtain a thick film. A resin layer having a thickness of 50 μm was formed to prepare a card substrate (thickness: 230 μm) having the structure shown in FIG.

This card base material has a tensile strength of 5 kg.
/ Mm ² , folding endurance is 200 times, has good physical strength, and as a result of carrying out a continuous carrying test as a membership card,
No abnormalities such as peeling or deformation of the cross section were observed. [Example 2] As a paper base material, a high-quality paper having a thickness of 200 µm and a tensile strength of 2 kg / mm ² was prepared.
0,000 polycarboxylic acid / diol polycondensation film (thickness 5
0 μm) was laminated to form a card base material (thickness 300 μm) having the structure shown in FIG.

This card base material has a tensile strength of 12 k.
It had g / mm ² , folding endurance of 300 times, extremely high physical strength, and as a result of carrying out a carrying test at all times as a membership card, no abnormality such as peeling or deformation of the cross section was found. Example 3 As a paper base material, a high quality paper having a thickness of 250 μm and a tensile strength of 2 kg / mm ² was prepared, and this paper base material was impregnated with polycaprolactone having a molecular weight of 100,000 as a degradable plastic. A card base material (thickness: 270 μm) having the structure as shown was prepared. The content of degradable plastic in this case was 25% by weight. This card base material has a tensile strength of 20 kg / mm ² and a folding endurance of 500 times, has good physical strength, and has been subjected to a continuous carrying test as a membership card. No abnormality was found.

[0040]

As described in detail above, according to the present invention, a resin layer formed of degradable plastic is provided on at least a part of one surface of the paper substrate, or the paper substrate is degradable. The card base material is constituted by containing the plastic in the range of 10 to 50% by weight, whereby the degradable plastic compensates for the low physical strength of the paper base material and the tensile strength is 5 kg / mm ² or more. In addition, the folding strength is 50 times or more, the physical strength is excellent, the decomposability is excellent, the disposal after use is easy, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of a card substrate of the present invention.

FIG. 2 is a schematic sectional view showing another example of the card substrate of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Card base material 2 ... Paper base material 3 ... Resin layer 11 ... Card base material 12 ... Degradable plastic-containing paper base material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location G06K 19/00 (72) Inventor Hirotaka Tsuchiya 1-1-1 Ichigayaga-cho, Shinjuku-ku, Tokyo Large Nippon Printing Co., Ltd.

Claims (6)

[Claims] 1. A paper base material, and a resin layer formed of degradable plastic on at least one surface of the paper base material, having a tensile strength of 5 kg / mm ² or more and a folding endurance of 5.
A card base material characterized by being 0 times or more. 2. The card base material according to claim 1, wherein the resin layer is formed by extrusion coating degradable plastic on the paper base material. 3. A paper base material containing 10 to 10 degradable plastics.
Contains 50% by weight and has a tensile strength of 5 kg / m
A card base material having a m ² or more and a folding endurance of 50 times or more. 4. The card base material according to claim 3, wherein the paper base material comprises at least pulp, a filler and a sizing material, and the sizing material is a degradable plastic. 5. The card base material according to claim 3, wherein the degradable plastic is mixed in the paper base material during the papermaking of the paper base material. 6. The card base material according to claim 3, wherein the degradable plastic is impregnated in the paper base material after the paper base material is formed.