JP2000246858A - Card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve printability and thermal fusion bonding laminability by integrally laminating coating layers each having an intrinsic viscosity of a specific range, and containing an amorphous polyester resin on both surfaces of a core layer made of a resin composition containing an amorphous polyester resin. SOLUTION: Coating layers 3 each having an intrinsic viscosity of 0.70 to 0.76 and containing an amorphous polyester resin are integrally laminated on both surfaces of a core layer 2 containing one or more types of a modifier selected from a synthetic rubber such as an ethylene-vinyl acetate copolymer, an ethylene-propylene rubber or the like and a styrene resin such as an acrylonitrile-butadiene-styrene copolymer, a methyl methacrylate-butadiene- styrene copolymer or the like in an amorphous copolymerization polyester resin composition obtained by substituting 10 to 70% of an ethylene glycol component of a polyethylene terephthalate with a cyclohexanedimethanol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a plastic card such as a magnetic stripe card.

[0002]

2. Description of the Related Art In recent years, the use of plastic cards as information recording media, such as credit cards and cash cards, has been rapidly expanding. In many cases, information (characters, numbers, etc.) is embossed so as to float on the card surface.

As a material for such a card substrate, a vinyl chloride resin has been used because it is inexpensive and has excellent embossability. Furthermore, cards made of this vinyl chloride resin are most widely used because of their excellent printability, heat-sealing lamination properties, and card punching properties.

In recent years, there has been a strong demand for global environmental protection. However, even in such a card, it is strongly demanded that the material be replaced with a non-vinyl chloride resin material from the viewpoint of ensuring environmental protection and safety and health. Is being done.

In order to meet such demands, there has been proposed a card substrate made of amorphous PET (polyethylene terephthalate) resin.

[0006]

The use of this amorphous PET resin not only can meet the requirements of global environmental protection, but also has excellent printability and heat-sealing lamination properties. However, on the other hand, the embossing engraving property decreases,
That is, there is a problem that the embossed portions (embossed characters, embossed numbers, etc.) are cracked during embossing. Generally, in a credit card, a cash card, and the like, a magnetic recording layer such as a magnetic stripe is provided on an upper surface thereof. However, since the magnetic stripe or the like greatly restricts a degree of freedom in design, a shielding is provided on the entire upper surface. A layer having a structure in which characters, pictures, and the like are printed on the shielding layer, and a protective layer is further laminated is often used. In this case, the occurrence of cracks in the embossed stamped portion was remarkable.

[0007] The present invention has been made in view of the above technical background, and enables to meet the demands of global environmental preservation, and has excellent printability, heat-sealing lamination properties, and emboss processing. It is an object of the present invention to provide a card which is excellent in embossing stamping property without occurrence of cracks in the embossed stamping part.

[0008]

Means for Solving the Problems To achieve the above object, the present inventors have conducted intensive studies and found that both sides of a core layer composed of a resin composition containing an amorphous polyester resin were
By adopting a configuration in which a coating layer containing an amorphous polyester-based resin and having an intrinsic viscosity in a specific range is laminated and integrated, the problem of poor embossing engraving can be solved and the desired card can be obtained. The inventors have found and completed the present invention.

That is, a card according to the present invention comprises a core layer made of a resin composition containing an amorphous polyester resin, and an amorphous polyester resin laminated and integrated on both sides of the core layer. Has an intrinsic viscosity of 0.70-0.
And a coating layer in the range of 76.

The use of a non-vinyl chloride resin can meet the requirements of environmental protection, while the use of an amorphous polyester resin as the resin constituting the card provides excellent printability and heat-sealing lamination properties. In addition, since a coating layer having an intrinsic viscosity in the range of 0.70 to 0.76 is laminated on both surfaces of the core layer, the occurrence of cracks in the embossed stamp portion during the formation of the emboss is effectively prevented.

The above-mentioned amorphous polyester resin includes:
It is preferable to use a copolymerized polyester resin in which 10 to 70% of the ethylene glycol component in polyethylene terephthalate is substituted with cyclohexane dimethanol. With such a configuration, it is more effective to generate cracks in the embossed stamped portion during embossing. Can be prevented.

The resin composition constituting the core layer preferably contains one or more modifiers selected from a synthetic rubber and a styrene-based resin. When the filler is contained, the occurrence of cracks in the embossed stamped portion during embossing can be more effectively prevented. In addition, mechanical strength such as impact strength as a card is also improved.

Furthermore, the resin composition constituting the core layer contains 2 to 50 parts by weight of the above modifier with respect to 100 parts by weight of the amorphous polyester resin, but the above-mentioned effects are impaired. This is preferable because the embossing of the card can be further improved.

[0014]

FIG. 1 is a sectional view of a card according to an embodiment of the present invention. The card (1) according to the present invention has a core layer (2) made of a resin composition containing an amorphous polyester resin, and has an intrinsic viscosity of 0.70 containing an amorphous polyester resin on both surfaces. ~ 0.76
Are laminated and integrated with each other.

As described above, since the non-vinyl chloride resin is used as the material forming the card (1), it is possible to sufficiently meet the demand for environmental protection. In addition, since an amorphous polyester resin is used as a material constituting the card (1), the card has excellent printability and heat-sealing lamination properties.

In the present invention, an amorphous polyester resin is used as a resin constituting the core layer (2).
The amorphous polyester resin is not particularly limited as long as it is an amorphous polyester resin. Among them, copolymers in which 10 to 70% of an ethylene glycol component in polyethylene terephthalate is substituted with cyclohexanedimethanol. Polyester resins are preferred. If the substitution amount is less than 10%, it becomes undesirably crystalline, resulting in reduced heat-sealing lamination properties and difficulty in lamination. On the other hand, when the substitution amount exceeds 70%, the molding processability is undesirably reduced. Among them, the substitution amount is 20 to 4
More preferably, it is 0%. Examples of the amorphous polyester resin include PET manufactured by Eastman Chemical Company.
G series and the like.

In the resin composition constituting the core layer (2), one selected from a synthetic rubber and a styrene resin is used.
It is desirable to include one or more modifiers. This makes it possible to more effectively prevent the occurrence of cracks in the embossed stamped portion during embossing. Further, the mechanical strength of the card can be greatly improved.

The content of the modifier is preferably 2 to 50 parts by weight based on 100 parts by weight of the amorphous polyester resin. If the amount is less than 2 parts by weight, a sufficient improvement in embossing engraving property cannot be expected. On the other hand, if the amount exceeds 50 parts by weight, not only does the strength fall below the preferred content, but also the cost increases. Is not preferred. Especially, it is more preferable to set it as 2-15 weight part.

The synthetic rubber is not particularly restricted but includes, for example, EVA (ethylene-vinyl acetate copolymer), EPR (ethylene-propylene rubber), BR
(Butadiene rubber), PB (polybutadiene), SBR
(Styrene-butadiene rubber), NBR (acrylonitrile-butadiene rubber) and the like.

The styrenic resin is not particularly limited. For example, ABS resin (acrylonitrile-butadiene-styrene copolymer), MBS (methyl methacrylate-butadiene-styrene copolymer), A
AS resin (acrylic rubber-acrylonitrile-styrene copolymer), ACS resin (acrylonitrile-chlorinated polyethylene-styrene copolymer) and the like can be mentioned.

Among them, the modifying agents include MBS resin and A
It is more preferable to use a BS resin. In this case, the embossing engraving property can be further improved with a small amount of addition.

It is not preferable to use a modifier other than the synthetic rubber and the styrene-based resin, for example, a modifier such as PE (polyethylene), because a sufficient improvement in embossing engraving cannot be expected.

The resin composition constituting the core layer (2) contains pigments, fillers (calcium carbonate, talc, etc.),
Various additives such as an antiblocking agent, a stabilizer, an antistatic agent, and a lubricant (eg, wax, fatty acid ester) can be appropriately compounded as necessary. In particular, pigments are usually blended for imparting concealing properties. In particular, white pigments are preferably used, and among them, titanium oxide which is inexpensive and has excellent concealing properties is more preferable. The amount of the pigment is preferably 1 to 30 parts by weight based on 100 parts by weight of the amorphous polyester resin. If the amount is less than 1 part by weight, it is not preferable because sufficient concealing property cannot be ensured. On the other hand, if the amount exceeds 30 parts by weight, the concealing property cannot be expected to be improved, and the cost is increased and the mechanical properties are lowered. It is not preferable.
Especially, it is more preferable to set it as 5-20 weight part.

As the titanium oxide, any of rutile type and anatase type can be used. Further, it is preferable to use one having an average particle size of 0.1 to 0.5 μm. When the thickness is less than 0.10 μm, the powder is fine and easily scatters in the air at the time of work, which is not preferable from the viewpoint of work hygiene. Among them, the average particle size is 0.15 to 0.3μ
More preferably, m is used.

Various polymers (such as synthetic resins) can be blended in the resin composition constituting the core layer (2) as long as the effects of the present invention are not impaired.

On the other hand, as a resin constituting the coating layer (3) laminated and integrated on both sides of the core layer (2), an amorphous polyester resin is used, and the intrinsic viscosity of the coating layer (3) is used. Must be in the range of 0.70 to 0.76.

If the intrinsic viscosity is less than 0.70, cracks will occur in the embossed portion (20) during embossing.
On the other hand, in order to secure the amorphous state of the polyester resin, the intrinsic viscosity does not exceed 0.76.

The intrinsic viscosity (IV value) is determined from the viscosity of a solution of a sheet constituting the coating layer (3) when a predetermined amount of the sheet is dissolved in a predetermined solvent. , 60% by weight phenol and 40% by weight 1,1,2,2
In 100 mL of a mixed solvent of 2-tetrachloroethane, 0.1.
25 g of the test solution obtained by dissolving 5 g of the sample (coating layer)
It is a value (viscosity) obtained by measuring the falling time in a capillary viscometer at ° C. and calculating from the following formula. Intrinsic viscosity (IV value) = {ln (t ₁ / t ₀ )} / 0.5 ln: natural logarithm t ₁ : drop time of test liquid in a capillary viscometer t ₀ : capillary of mixed solvent only (blank) Fall time in viscometer

As a resin constituting the coating layer (3), an amorphous polyester resin is used. The amorphous polyester resin is not particularly limited as long as it is an amorphous polyester resin. Among them, copolymers in which 10 to 70% of an ethylene glycol component in polyethylene terephthalate is substituted with cyclohexanedimethanol. Polyester resins are preferred. 1 as replacement amount
The reason why 0 to 70% is suitable is the same as described above, and the substitution amount is more preferably 20 to 40% as described above.

In the coating layer (3), similarly to the core layer (2), pigments, fillers (calcium carbonate, talc, etc.), antiblocking agents, stabilizers, antistatic agents, lubricants Various additives such as (wax, fatty acid ester, etc.) may be appropriately blended as needed.

Various polymers (synthetic resins, etc.) can be blended in the resin composition constituting the coating layer (3) as long as the effects of the present invention are not impaired.

Those having an intrinsic viscosity in the range of 0.70 to 0.76 can be obtained, for example, as follows. That is, usually, a commercially available amorphous polyester-based resin contains about 1000 to 3000 ppm of water, for example, by heating and drying this to reduce the water content to 500 ppm or less, After the sheet is formed, a sheet (coating layer) having an intrinsic viscosity in the above-specified range can be obtained. That is, 500
After drying until the water content becomes less than ppm, it may be subjected to sheet processing. Usually, heating the resin at 65 ° C. for 7 hours or more can reduce the water content to 500 ppm or less.

Alternatively, in the case of processing with an extruder, the gas (moisture) is sucked from a vent hole in the middle of the extruder to reduce the water content in the resin and the resin is extruded. A sheet (coating layer) having an intrinsic viscosity in the above specified range can be obtained.

The control of the intrinsic viscosity can be performed by controlling the water content in the resin as described above. However, the present invention is not particularly limited to such means, and may be controlled by other means. good.

In the present invention, the thickness of the core layer (2) is generally 0.56 to 0.66 mm, and the thickness of the coating layer (3) is generally 0.05 to 0.10 mm. And the thickness of the card (1) is 0.76 to
Generally, it is designed to be 0.80 mm.

When used as a credit card, a cash card, or the like, a magnetic recording layer (10) such as a magnetic stripe is provided on the upper surface of the cover layer (3) of the card as shown in FIG. A shielding layer (11) made of resin is laminated on the entire upper surface, and the shielding layer (11) is formed.
A design printing layer (12) of characters, pictures, etc. is laminated on the above, and a protective layer (13) made of a resin is further laminated thereon. The card (1) according to the present invention has an embossed engraved portion (2) at the time of emboss formation even when such a multilayered configuration is adopted.
0) can be effectively prevented from occurring. Also, usually, the core layer (2) and the backside coating layer (3)
The back side character printing layer is laminated between the layers.

The card (1) of the present invention can be used not only as a plastic card as an information recording medium such as a magnetic stripe card, but also as a simple plastic card without such an information recording function (eg, a membership card). Can be used.

[0038]

Next, specific embodiments of the present invention will be described.

Example 1 An amorphous copolyester resin in which 30% of the ethylene glycol component in polyethylene terephthalate was replaced with cyclohexanedimethanol was dried by heating at 75 ° C. for 10 hours in advance to obtain a resin having a water content of 300 ppm. I got By extruding the resin, a coated sheet having an intrinsic viscosity of 0.74 (thickness of 0.14) was obtained.
1 mm).

On the other hand, 100 parts by weight of PETG6763,
A resin composition was obtained by mixing 10 parts by weight of MBS resin (trade name: B-56, manufactured by Kaneka Corporation) and 10 parts by weight of titanium oxide.
This resin composition was similarly extruded to obtain a white core sheet having a thickness of 0.56 mm.

The coated sheet was laminated and integrated on both sides of the core sheet by hot press (120 ° C.) and punched into a card form to obtain a card having a length of 54 mm and a width of 86 m.
m, a card having a thickness of 0.76 mm was produced.

<Examples 2 to 4> Cards were produced in the same manner as in Example 1 except that a core sheet was produced using a resin composition containing the materials shown in Table 1 in the proportions shown in Table 1. .

Example 5 A water content of 5 obtained by heating and drying the same amorphous copolyester resin as in Example 1
A card was produced in the same manner as in Example 1, except that a sheet (having a thickness of 0.1 mm) having an intrinsic viscosity of 0.71 obtained by extruding a resin of 00 ppm was used as a covering sheet.

Example 6 A coating sheet having an intrinsic viscosity of 0.75 (thickness: 0.1 mm) was used as the covering sheet.
A card was produced in the same manner as in Example 1.

<Embodiment 7> A stripe-shaped magnetic recording layer was provided on the upper surface of the card manufactured in Example 1, and a shielding layer was further laminated on the entire upper surface of the card, on which design prints such as characters and pictures were printed. Then, a protective layer was further laminated thereon to produce a card having a thickness of 0.78 mm (see FIG. 2). In addition, the lamination of each layer was all performed by printing.

Example 8 A card having a thickness of 0.78 mm was produced in the same manner as in Example 7 except that the card produced in Example 2 was used instead of the card produced in Example 1. did.

<Comparative Example 1> The same amorphous copolyester resin as in Example 1 was heated and dried to reduce the water content from 2000 ppm at the beginning to 1000 ppm (the intrinsic viscosity at this point was 0 ppm). After that, a sheet having an intrinsic viscosity of 0.65 (thickness: 0.1 mm) obtained by directly extruding was used to produce a card in the same manner as in Example 1 except that the sheet was used as a covering sheet. did.

Each card produced as described above was evaluated according to the following evaluation method.

<Evaluation Method of Embossing Engraving Property> Using a motorized embosser, 48 characters (numbers) were imprinted on each card. A test was performed on each of the ten cards, the average state was investigated, and evaluation was performed based on the following criteria.

(Judgment Criteria) "…": No cracks at the embossed mark "O": Small cracks that are inconspicuous are observed on very few cards "△": About 2 to 5 characters Small cracks are observed "x" ... Large and remarkable cracks occurred in many characters

[0051]

[Table 1]

[0052]

[Table 2]

<Evaluation Results> As is clear from the table, the cards of Examples 1 to 8 of the present invention are effectively prevented from cracking at the embossed stamped portion during embossing, and have excellent embossed stamping properties. Was. Above all, Example 1 in which the resin composition constituting the core layer contains MBS resin or SBR
Cards Nos. 3, 5 and 8 were particularly excellent in embossed engraving properties. In Examples 7 and 8, the printing state was good.

On the other hand, Comparative Examples 1 and 2 were inferior in embossing engraving.

[0055]

As described above, the card of the present invention can meet the demands of environmental preservation because the non-vinyl chloride resin is used as a constituent resin, while the card is made of an amorphous polyester resin as a constituent resin. Excellent heat-sealing lamination properties. In addition, since a coating layer having an intrinsic viscosity in a specific range is laminated on both sides of the core layer, it is possible to effectively prevent the occurrence of cracks in the embossed stamped part at the time of forming the emboss, and it is possible to effectively prevent a personal name and a registration number. Can be embossed in a clear and beautiful state.

The amorphous polyester resin is one of the ethylene glycol components in polyethylene terephthalate.
In the case where the copolymerized polyester resin is obtained by replacing 0 to 70% with cyclohexanedimethanol, it is possible to more reliably prevent the occurrence of cracks in the embossed stamped portion during embossing.

When the resin composition constituting the core layer contains one or more modifiers selected from a synthetic rubber and a styrene-based resin, the embossed portion at the time of emboss formation is used. The generation of cracks can be more reliably prevented. In addition, the mechanical strength of the card can be improved.

The resin composition constituting the core layer was prepared by adding the above modifier to 100 parts by weight of the amorphous polyester resin.
When it is contained in an amount of 50 to 50 parts by weight, it is possible to more reliably prevent the occurrence of cracks in the embossed stamped portion at the time of embossing without impairing the above effects. Further, the mechanical strength of the card can be further improved.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing a card according to another embodiment.

FIG. 3 is a cross-sectional view showing the vicinity of an engraved portion of a card on which embossing is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Card 2 ... Core layer 3 ... Coating layer

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 19, 1999 (1999.3.1.
9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction contents]

On the other hand, the amorphous copolymerized polyester resin
By mixing 100 parts by weight, 10 parts by weight of MBS resin (trade name: B-56, manufactured by Kanegafuchi Chemical Co., Ltd.) and 10 parts by weight of titanium oxide, a resin composition is obtained, and the resin composition is similarly extruded. A white core sheet having a thickness of 0.56 mm was obtained.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0054

[Correction method] Change

[Correction contents]

[0054] In contrast, in Comparative Example 1 was inferior to the embossing stamp properties.

 ────────────────────────────────────────────────── ─── Continued on the front page F-term (reference) 2C005 HA21 HA30 HB09 JA02 JA08 KA03 KA07 4F100 AA21 AK12 AK12A AK12J AK25 AK25J AK29 AK29J AK41A AK41B AK41C AK42B AK42C AK80 AL01 BA07B12 JA03 BA06 JA12C JL00 JL12 YY00B YY00C

Claims (4)

[Claims] 1. A core layer comprising a resin composition containing an amorphous polyester-based resin, and an intrinsic viscosity containing an amorphous polyester-based resin laminated and integrated on both surfaces of the core layer is 0. .70 to 0.76
A card comprising a coating layer in the range of 2. The card according to claim 1, wherein the amorphous polyester resin is a copolymer polyester resin obtained by substituting 10 to 70% of an ethylene glycol component in polyethylene terephthalate with cyclohexanedimethanol. 3. The card according to claim 1, wherein the resin composition constituting the core layer contains one or more modifiers selected from a synthetic rubber and a styrene-based resin. . 4. The card according to claim 3, wherein the resin composition constituting the core layer contains 2 to 50 parts by weight of the modifier based on 100 parts by weight of the amorphous polyester resin.