JP2014188990A - Overprint card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overprint card in which fluidity of a layer which is a base of a pattern generated by being heated can be suppressed during overprint card forming, and crack phenomenon of the pattern due to heating can be prevented.SOLUTION: An overprint card 10 comprises: a pattern layer 6 formed on a card base material 9 by a light curable ink; and a protection layer 7 on the uppermost layer. As a base 5 of the pattern layer 6, a curable ink layer formed of the light curable ink or heat curable ink and having thickness of 0.5-7 μm is provided.

Description

  The present invention relates to a card such as a magnetic card and an IC card, and more particularly to an overprint card in which an overprint layer as a transparent protective layer is provided on a pattern layer on the surface.

  Magnetic cards and IC cards used for cash cards, credit cards, transportation cards, and the like use cards having various layer configurations based on various standards.

  Among these, an overprint card having an overprint layer (synonymous with an overcoat layer, hereinafter referred to as an overcoat layer), which is a transparent protective layer, on the surface pattern layer is excellent in design and has a surface pattern. It is widely used for various types of cards because the layers do not wear easily and the surface gloss is good.

  The overprint card has a design improved by forming a concealing layer on the magnetic stripe to make the magnetic stripe invisible, and is widely distributed mainly in Japan. As for the ink used for this overprint card, it is common to use a photocurable resin for the pattern layer and a thermoplastic resin for the solid printing as the base (Patent Document 1).

  However, if a thermoplastic resin is used for the base, the thermoplastic resin of the base softens and flows during thermoforming, and the photocurable resin on the base also flows in a form that follows. At that time, since the pattern layer is cured, the pattern layer is not flexible, and a phenomenon such as a crack may occur in the pattern layer. In addition, when there is an IC chip or an antenna in a magnetic stripe or a non-contact IC card, there is a problem that stress is easily applied to the peripheral portion during thermoforming, and a phenomenon such as cracking is more likely to occur.

JP 2011-76687 A

  It is an object of the present invention to provide an overprint card that suppresses the fluidity of a layer serving as a base of a picture layer generated by heating at the time of overprint card molding and prevents cracking of the picture layer caused by heating.

As means for solving the above-mentioned problems, the invention according to claim 1 is an overprint card having a picture layer formed of a photocurable ink on a card substrate and a protective layer on the uppermost surface. And
An overprint card comprising a photocurable or thermosetting type curable ink layer having a thickness of 0.5 to 7 μm as a base of the pattern layer.

  The invention according to claim 2 is the overprint card according to claim 1, wherein the curable ink layer has a Tg of 90 ° C. or more.

  The invention described in claim 3 is characterized in that an adhesive layer of 0.1 to 4 μm is provided between the curable ink layer and the card substrate. It is an overprint card.

  The invention according to claim 4 is the overprint card according to claim 3, wherein the adhesive layer has a hydroxyl group.

  The invention according to claim 5 is characterized in that titanium oxide and aluminum are contained in the curable ink layer in a ratio of 10 to 50% by weight. The overprint card according to the item.

  The invention according to claim 6 is characterized in that the pattern layer and the curable ink layer are formed using radical polymerization curable ink, and the pattern layer and the curable ink are cured simultaneously. The overprint card according to any one of Items 1 to 5.

  In overprint cards, by forming a printing layer with curable ink on the base of the pattern layer formed by UV printing, it is possible to prevent the pattern layer from collapsing during thermoforming and to make the card excellent in appearance. it can. Also, the presence of the cured ink layer improved the surface strength, improved the scratch strength and the physical properties of the head path test, and reduced the appearance defect rate.

It is the cross-sectional conceptual diagram which showed the layer structure of the overprint card | curd of this invention. It is a conceptual sectional view showing a layer structure of a conventional overprint card.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 shows a layer structure of an overprint card 10 of the present invention, in which a surface exterior base material 2 having a magnetic stripe 4 on the surface and a back surface exterior base material 3 on the back surface are laminated on a core base material 1. In addition, a curable ink layer is provided as a base 5 on the surface exterior base material 2, and a pattern layer 6 and a protective layer 7 are provided thereon.

  The conventional overprint card 10 is provided with a thermoplastic resin as a base 5, and the base 5 of the pattern layer 6 is made of a thermoplastic resin. There is a case where the layer 6 flows in a follow-up manner and a crack is generated in the pattern layer 6.

  In FIG. 2, the pattern layer 6 and the protective layer 7 are transferred to the card base material via the adhesive layer at the time of heat formation by a laminating press.

<Core substrate 1>
A white or colorless oversheet is bonded to both outer sides of the white or colorless core substrate 1, and one plate-like card substrate 9 is produced by thermoforming. At this time, the pattern layer 6 may or may not be formed between the core substrate 1 and the oversheet that is the exterior substrate.

The card | curd base material 9 with a magnetic stripe is producible by arrange | positioning the magnetic stripe 4 to the surface exterior base material 2 previously, and performing thermoforming. Instead of using the front surface exterior base material 2 and the back surface exterior equipment 3, the core base material 1 alone may be used as the card base material 9. Materials used as the core substrate 1 include vinyl chloride, vinyl chloride-vinyl acetate copolymer, terephthalic acid, cyclohexanedimethanol and ethylene glycol copolymer, terephthalic acid, isophthalic acid and ethylene glycol copolymer. Examples thereof include amorphous polyester, polyethylene terephthalate, polybutylene terephthalate, ABS, paper, impregnated paper, etc. made of a polymer alloy of a polymer or a copolymer thereof and polycarbonate and / or polyarylate.

  In the case of a non-contact IC card, thermoforming is performed after an antenna or an antenna mounted with an IC chip is disposed between the core base materials 1.

<Adhesive layer 8>
A thermoplastic resin layer may be formed on the card substrate 9 as the adhesive layer 8. In this case, the adhesive layer 8 made of a thermoplastic resin is used to improve the adhesive strength between the card substrate 9 and the base with the curable ink formed on the adhesive layer 8 made of the thermoplastic resin.

  As the resin used for the adhesive layer 8 made of a thermoplastic resin, vinyl chloride, vinyl acetate, vinyl alcohol, an acrylic resin, a polyester resin, a polyurethane resin, and a copolymer thereof are used. Those having OH) generate a hydrogen bond and thus have good adhesive strength.

  Further, since the adhesive layer 8 also has a function of hiding the magnetic stripe 4, the number of printings can be reduced and the total thickness of the picture layer 6 can be reduced. A pigment such as scaly aluminum powder or titanium oxide may be added. The thickness of the adhesive layer 8 made of a thermoplastic resin is preferably 0.1 to 4 μm.

<Formation of base 5>
In the present invention, the base 5 is formed on the card base 9 or the adhesive layer 8 made of a thermoplastic resin. The base 5 has a Tg of 90 ° C. or higher, and in the case of a resin having a plurality of Tg, the highest Tg is 90 ° C. or higher. In the case of less than that, it will flow at the time of the thermoforming in a post process, and an effect cannot be demonstrated.

  In the conventional overprint card 10, a thermoplastic resin is used as the base 5, but since the Tg is 90 ° C. or less, the base 5 flows in a subsequent process. In the present invention, Tg can be raised to 90 ° C. or higher by making the resin used for the base 5 curable.

  Thermosetting resins include acrylic resins, polyester resins, and epoxy resins, and curing agents such as isocyanate, as appropriate. Photocurable resins include polyurethane acrylate, polyester acrylate, epoxy acrylate, and polyether. Examples include acrylates, etc. These may be used by adding polyfunctional or monofunctional monomers to the respective prepolymers in order to adjust the viscosity or crosslink density, and if necessary, known photoreaction initiation An agent and a sensitizer may be added and used.

  Similarly, the base 5 also serves to conceal the magnetic stripe 4, thereby reducing the number of times of printing and reducing the total thickness of the printed layer. A pigment such as aluminum powder or titanium oxide may be added. The thickness of the base is preferably 0.5 to 7 μm, and if it is less than this, the effect as the base 5 is not exhibited.

<Formation of pattern layer 6>
The pattern layer 6 can arbitrarily use 10 to 60% by weight of an inorganic pigment in a photocurable resin. The thickness of the coating is preferably 0.1 to 3.0 μm. Here, it is convenient for the minimum thickness to be 0.1 μm, and actually, it may be larger than 0 μm. Examples of the resin include polyurethane acrylate, polyester acrylate, epoxy acrylate, polyether acrylate, etc. These are used by adding a polyfunctional or monofunctional monomer to each prepolymer in order to adjust viscosity or crosslink density. Moreover, you may add and use a well-known photoreaction initiator and a sensitizer as needed.

<Batch printing of substrate 5 and pattern layer 6>
When both the base 5 and the pattern layer 6 use a photocurable resin, they may be printed at once using a printer capable of multicolor printing. As the printing method, offset printing, screen printing, gravure printing, flexographic printing, or the like can be used. In this case, it is possible to improve the adhesion between the printing layers by printing between the printing units as hard as possible and completely curing after printing in the final unit.

<Formation of protective layer 7>
The protective layer 7 is formed on the pattern layer 6 of the card substrate 9. As the forming method, offset printing, screen printing, gravure printing, flexographic printing, die coating, or the like can be used.

  Examples of the ink resin used include vinyl chloride, vinyl acetate, polyvinyl alcohol, polyester resin, polyurethane resin, acrylic resin, polycarbonate resin, epoxy resin, ABS and copolymers thereof, and polymer alloy. .

  Further, as additives to be added to the ink of the protective layer 7, waxes such as polyethylene wax and PTFE wax, mica, talc, silica and the like can be considered, and these can be used as necessary. A thickness of 0.5 to 8.0 μm is appropriate.

<Thermoforming>
In a state where the protective layer 7 is printed, the surface of the protective layer 7 has a mat shape. This is made into a mirror-like plane by thermoforming. The card substrate 9 is sandwiched between metal plates with Ra of 0.1 μm or less, and molded with a laminating press or the like. At this time, a film having an Ra of 0.1 μm or less may be sandwiched between the metal plate and the card substrate 9. As the material of the film, polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, or the like can be used. As for the conditions of the laminating press, a heating temperature of 100 to 150 ° C. and a pressure of 1.0 to 40 MPa are suitable.

<Printing method on transfer foil>
The adhesive layer 8 made of thermoplastic resin, the base 5, the pattern layer 6, and the protective layer 7 may be printed on the transfer film in reverse order and transferred to the card substrate 9. Transfer is performed at the time of thermoforming or in a single step using a laminator or the like. The material of the transfer film may be a generally used material such as stretched PET or PP, and a thickness of about 12 to 125 μm is suitable.

<Small cutout>
Since the overprint card 10 is generally manufactured in a state where the overprint card 10 is arranged in multiple faces on the full-size sheet, the overprint card 10 is cut out into small pieces after the process of the full-size sheet is completed. Cutting is performed by cutting with a card-shaped blade or punching with a card-shaped punch.

  A core substrate 1 made of a polyvinyl chloride sheet having a thickness of 0.6 mm and a 0.1 mm thick exterior substrate made of polyvinyl chloride having magnetic stripes 4 arranged at predetermined positions on both surfaces of the core substrate 1. The card substrate 9 having a multi-sided arrangement with a thickness of 0.8 mm was prepared by thermoforming. Next, an adhesive layer 8 made of a thermoplastic resin having a thickness of 1.5 μm was provided on the surface of the magnetic stripe 4 of the card substrate 9 by screen printing with an ink having the following composition.

<Adhesive layer 8 ink composition>
Vinyl chloride-vinyl acetate-vinyl alcohol copolymer resin 85 wt% aluminum paste (flakes) 15 wt% The solvent component is excluded.

  The base 5 was provided with the following ink by screen printing with a thickness of 2 μm, and the pattern layer 6 was printed with the following ink by offset printing with a thickness of 1 μm.

<Base 5 ink>
As the base 5 ink, a UV curable TU240SS concrete 662 white mainly composed of an acrylic prepolymer having a Tg of 90 to 110 ° C. after curing, manufactured by Toyo Ink Co., Ltd. was used.

<Picture layer 6 ink>
Each color of FDO New HF1 (UV curable resin; manufactured by Toyo Ink Co., Ltd.) was used.

  Next, the protective layer 7 was printed with a thickness of 2 μm and thermoformed by a laminate press. The thermoforming conditions are 125 ° C., 2.0 MPa, and 20 minutes. Then, it cools and hold | maintains, hold | maintaining a pressure until it becomes normal temperature. And it was set as the card | curd piece by punching the male-female metal mold | die.

A 2 μm release layer was previously formed on 25 μm stretched PET by flexographic printing, and a pattern layer was formed to a thickness of 1 μm using each color of FDO New HF1 (UV curable resin; manufactured by Toyo Ink Co., Ltd.) in the same manner as in Example 1. Further, the base 5 is formed into a thickness of 2 μm using a UV curable FD FL whose main component is an acrylic prepolymer having a Tg of 90 to 110 ° C. as a main component, as the base 5 ink, An adhesive layer 8 made of a thermoplastic resin having a thickness of 1.5 μm was provided by screen printing with an ink having the following composition.

<Adhesive layer 8 ink composition>
Vinyl chloride-vinyl acetate-vinyl alcohol copolymer resin 85 wt% aluminum paste (flakes) 15 wt% The solvent component is excluded.

  Next, it transfers to the card | curd base material 9 at the time of thermoforming by a laminate press. The card substrate 9 was thermoformed under the same conditions as in Example 1, and after laminating press, it was separated into pieces as in Example 1.

<Comparative Example 1>
As the base 5 ink to be the curable ink layer in Example 1, a thermoplastic vinyl chloride resin SS8 Conch 611 White having a Tg of 60 to 65 ° C. The same as in Example 1 except that Toyo Ink Co., Ltd. was used. A small piece was made.

<Picture cracks>
The frequency of occurrence of cracks in the pattern layer 6 when 3000 pieces of small slices of Examples 1 and 2 and Comparative Example 1 were produced was examined.

<Adhesion between pattern layer 6 and substrate 5>
The adhesiveness (adhesion) between the pattern layer 6 and the base 5 was evaluated for each of the small slices of Examples 1 and 2 and Comparative Example 1 by the method defined in JIS K5600-5-6.

<Scratch strength (pencil method>)
The scratch strength (pencil method) is measured by the method defined in each of JIS K5600-5-4 for each of the small slices of Examples 1 and 2 and Comparative Example 1.

<Head path resistance>
As a test method for head path resistance, a card reader was used for insertion and removal, and the surface scratches after a predetermined number of times were evaluated. Using a motor type card reader (for ATM) Sankyo Seiki Co., Ltd. MCT141-1A6612 as a testing machine, clean the magnetic head with a cotton swab soaked in ethanol in advance to remove foreign matter and film. It was set at a predetermined position, and continuous insertion / extraction was performed 5000 times, 10,000 times, and 20,000 times.

＜まとめ＞
実施例１，２は比較例１に比べて製造時のひび割れ不良の発生率が低く、実施例１，２は絵柄層６と下地５の付着性が良く、特に実施例２の付着性が優れていた。

<Summary>
Examples 1 and 2 have a lower incidence of cracking defects during production than Comparative Example 1, and Examples 1 and 2 have good adhesion between the pattern layer 6 and the base 5, and in particular, the adhesion of Example 2 is excellent. It was.

  The scratch strength of Examples 1 and 2 was high, and the durability was high in the head path test for Examples 1 and 2.

  Adhesion of the pattern layer 6 with the base 5 is improved by placing a base under the pattern layer 6, and in particular, Example 2 in which the pattern layer 6 and the base 5 are printed and cured together is particularly adhesive. Improved. In addition, by placing the base under the pattern layer 6, the thickness of the printed layer of the hardened pattern layer 6 and the base 5 is increased to increase the surface strength, and the physical properties are improved in the scratch test and the head path test. . Moreover, the fluidity | liquidity of the base | substrate of the pattern layer 6 fell by putting a base | substrate under the pattern layer 6, and the external appearance defect rate by the crack of the pattern layer 6 reduced.

DESCRIPTION OF SYMBOLS 1 ... Core base material 2 ... Front surface exterior base material 3 ... Back surface exterior base material 4 ... Magnetic stripe 5 ... Base 6 ... Pattern layer (photocurable resin)
7 ... Protective layer 8 ... Adhesive layer 9 ... Card substrate 10 ... Overprint card

Claims (6)

An overprint card having a pattern layer formed of a photocurable ink on a card substrate and a protective layer on the top surface,
An overprint card comprising a photocurable or thermosetting type curable ink layer having a thickness of 0.5 to 7 μm as a base of the picture layer.   The overprint card according to claim 1, wherein the curable ink layer has a Tg of 90 ° C. or more.   The overprint card according to claim 1, wherein an adhesive layer having a thickness of 0.1 to 4 μm is provided between the curable ink layer and the card substrate.   The overprint card according to claim 3, wherein the adhesive layer has a hydroxyl group.   The overprint card according to any one of claims 1 to 4, wherein the curable ink layer contains titanium oxide and aluminum in a ratio of 10 to 50% by weight.   The said pattern layer and the said curable ink layer were formed using radical polymerization curable ink, and the pattern layer and the curable ink were hardened simultaneously, The Claim 1 characterized by the above-mentioned. Overprint card.

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