JP2011148251A - Method for producing card - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a card, with which adhesiveness of a core sheet is made excellent, productivity of the card can be improved, and the quality thereof can be stabilized. <P>SOLUTION: The method for producing the card includes: a step 1 of performing screen printing on a sheet; and a step 2 of sticking at least two screen-printed sheets, which are obtained at the step 1, to each other to obtain the core sheet. The sheet comprises a resin composition whose breaking strength after a predetermined solvent exposure test is performed is ≥1.0 kgf/cm<SP>2</SP>. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a card manufacturing method.

 Currently, for credit cards, cash cards, prepaid cards and the like, IC cards equipped with IC modules having a large recording capacity and excellent security are widely used in place of conventional magnetic cards.

 IC cards are classified into two types, contact type and non-contact type, depending on the recording medium reading method. Conventionally, the contact-type method has a drawback that the IC card and the reader come into contact with each other when communicating with the terminal, so that the contact is easily soiled and broken. In the non-contact type, the recording medium and the reader do not have a contact point, so there is a problem in security systemization. However, many of these issues have already been solved by various system improvements, etc., and are widely deployed in the field of transportation such as financial cash cards, credit cards and commuter passes, and their practical application is rapidly progressing. It is out.

 As these IC cards, plastic cards in which resin sheets are laminated are often used. In general, a plastic card is produced by laminating a transparent sheet called an oversheet on both sides of a sheet colored in white as the core sheet. Many use chemicals.

 Conventionally, a sheet made of polyvinyl chloride resin (hereinafter referred to as PVC) has been generally used as a card sheet, but there are an increasing number of cases in which a polyester-based resin is used due to environmental problems such as incineration. . Among them, a copolymerized polyester resin (hereinafter referred to as PETG resin) obtained by substituting the ethylene glycol component of the polyethylene terephthalate resin with cyclohexanedimethanol is particularly often used.

 However, when screen printing is performed on a sheet made of an amorphous polyester resin such as PETG resin under the same conditions as PVC, the drying of the ink and solvent is very slow. The bottom sheet ink and solvent are transferred to the back side of the upper sheet stacked on the surface, and when a card is produced, the problem of poor fusing between the two sheets becomes a major problem. In response to such problems, the market demands a method for producing a card using a polyester sheet of an amorphous resin that does not cause poor fusion even when screen printing is performed with a PVC sheet printing facility or the like.

  Many techniques for imparting heat resistance to PETG resin sheets have been reported. For example, Patent Documents 1 and 2 report that heat resistance can be imparted by blending or laminating a heat-resistant resin such as polycarbonate resin (PC resin) to PETG resin. However, the technique described in this document has not yet solved the problem of poor fusing between two sheets when screen printing is performed under the same conditions as a card made of polyvinyl chloride resin.

  Conventionally, as an oversheet for an IC card, a mixture of a non-crystalline aromatic polyester-based resin composition and a polycarbonate-based resin set is used as a single-layer sheet, or a non-crystalline aromatic polyester-based resin. A multilayer film composed of a skin layer composed of a composition and a core layer composed of a polycarbonate-based resin composition and laminated in at least three layers of skin layer / core layer / skin layer by a coextrusion method has been used (for example, Patent Document 3).

  The conventional IC card oversheet is presumed to be designed to be resistant to cracking and impact by polycarbonate resin. However, as described above, IC cards with embedded IC modules are subject to repeated external stresses, etc. There are many problems such as cracks and the IC card itself being broken, which is a serious quality problem.

Recently, a card substrate having a module hole or embedded recess for mounting an IC module having an IC chip and an oversheet bonded to the card core sheet so as to close the IC module hole or embedded recess. And at least the IC chip of the IC module is an elastic body having a 2% elastic modulus of 0.05 to 50 kgf / mm ² and sealed in the IC module hole or the embedded recess. IC card manufacturing methods have also been proposed. (For example, Patent Document 4)

  Under these circumstances, attempts to improve the impact resistance by devising the IC module embedding method are not enough, but it is not enough. Among the materials used so far for IC cards, screens There is a need for a method of manufacturing a card that does not cause poor fusing after printing and has sufficient strength against cracks and cracks that occur around the IC module portion due to external stress.

Japanese Patent Application No. 2000-89403

Japanese Patent Laid-Open No. 2005-84931

JP 2001-80251

Patent No. 3045112

  The objective of this invention provides the manufacturing method of the card | curd which makes it possible to improve productivity and to stabilize quality by being excellent in the adhesiveness of a core sheet.

  Such an object is achieved by the present invention described below.

The card manufacturing method according to the present invention is a card manufacturing method including the step 1 of screen printing on a sheet and the step 2 of obtaining a core sheet by bonding at least two sheets screen-printed in the step 1. The sheet is made of a resin composition having a breaking strength of 1.0 kgf / cm ² after performing the following solvent exposure test 1.
[Exposure test method:
On a petri dish containing the following solvent a so that the liquid surface height is 5 mm or more and 20 mm or less,
By disposing a sheet having a thickness of 0.31 mm so as to be 10 ± 1 mm from the surface of the solvent, the sheet is exposed to the solvent a volatile matter.
Test conditions: Exposure test time 168 hours
Environmental temperature at the time of test 25 ℃
40% humidity during testing
Solvent a: cyclohexanone]

  In the card manufacturing method according to the present invention, the resin composition may include a polyester resin.

  In the card manufacturing method according to the present invention, the resin composition may include a polycarbonate resin.

  The card manufacturing method according to the present invention is such that the melt flow rate of the polycarbonate resin [measurement method: ASTM D-1238, measurement conditions: melting temperature 300 ° C., load 1.2 kg] is 3.0 g / 10 min or more and 13.0 g / It can be 10 min or less.

  In the method for producing a card according to the present invention, the polyester resin may be a copolymerized polyester resin obtained by substituting 10 to 70 mol% of an ethylene glycol component of polyethylene terephthalate with cyclohexanedimethanol.

  The manufacturing method of the card | curd which concerns on this invention shall have the process 3 which laminates | stacks an oversheet on both sides of the said core sheet.

  In the card manufacturing method according to the present invention, the oversheet may include a polyester resin.

  By using the card manufacturing method according to the present invention, it is possible to improve the fusing property when pressing two sheets after printing, even for card manufacturing using a polyester-based sheet. Even if screen printing is performed with a printing facility or the like, it is possible to reduce the occurrence of poor fusion and improve productivity.

It is an example which shows the schematic sectional drawing of the core sheet which bonded together two sheets obtained by the manufacturing method of the card | curd which concerns on this invention. It is an example which shows the schematic sectional drawing of the card | curd obtained by laminating | stacking an oversheet on a core sheet.

  Hereinafter, a specific example of the card manufacturing method according to the present invention will be described in more detail with reference to the drawings.

  The card manufacturing method according to the present invention includes a step of screen printing on a sheet. Here, the screen printing is a kind of stencil printing, in which a silk screen is printed on a plate, and is a printing method in which holes are made in the plate itself and ink is rubbed from there.

  The manufacturing method of the card | curd which concerns on this invention has the process of obtaining the core sheet which bonds a screen printing sheet. The two sheets are preferably bonded by thermal fusion from the viewpoint of reducing yield reduction during printing.

The resin composition used for the sheet used in the present invention preferably has a breaking strength after the following solvent exposure test 1 of 1.0 kg / cm ² or more, and more preferably 2.5 kg / cm ² or more. In particular, it is preferably 3.0 kg / cm ² or more and 5.0 kg / cm ² or less. By being in the above range, the peel strength of the core sheet bonded by heat fusion is increased, and a stable core sheet can be supplied during card production.

(Solvent exposure test 1)
The solvent exposure test is performed as follows. First, cyclohexanone as a solvent is placed in a petri dish so that the liquid surface height is 5 mm or more and 20 mm or less. Next, a 0.31 mm sheet is disposed so that the height is 10 ± 1 mm from the solvent liquid level. There is no need to cover the petri dish opening with a sheet, and the petri dish interior may be open to the atmosphere. After exposure to a solvent for 168 hours (environmental temperature 25 ° C., humidity 40%), a tensile test piece having a predetermined shape is prepared, and the breaking strength is measured by a tensile test.

  The resin composition preferably includes a polyester resin from the viewpoint of cost and environmental friendliness because the core sheet is polyester. Furthermore, from the viewpoint of low-temperature fusibility, the polyester is a copolymerized polyester resin obtained by substituting 10 to 70 mol% of the ethylene glycol component of the polyethylene terephthalate resin with cyclohexanedimethanol, and the amount of substitution of the ethylene glycol component is 20 to 35. It is preferable that it is resin (PETG resin) which is mol%.

  Further, the advantage of containing polycarbonate in the core sheet is that the resin composition preferably contains a polycarbonate resin from the viewpoint of crack durability during ATM transport, and from the viewpoint of moldability, strength, heat resistance, and printability. According to ASTM D-1238, when measured at a resin melting temperature of 300 ° C. and a load of 1.2 kg, it is 3.0 to 13.0 g / 10 min, preferably 4.0 to 8.0 g / 10 min. When the melt flow rate of the polycarbonate resin is smaller than the lower limit of the range, extrusion cannot be performed. When the upper limit of the range is exceeded, after screen printing, ink and solvent enter the PC molecular chain, and the solvent is difficult to escape under drying conditions of 40 ° C. and 10 minutes. For this reason, when the two sheets are pressed, poor fusion occurs. Moreover, when manufacturing this polycarbonate resin, you may add a molecular weight regulator, a catalyst, etc. as needed.

  The polycarbonate resin that can be used in the present invention is a polymer obtained by a phosgene method in which various dihydroxydiaryl compounds and phosgene are reacted or a transesterification method in which a dihydroxydiaryl compound and a carbonate such as diphenyl carbonate are reacted. .

  Examples of the dihydroxydiaryl compound include bisphenol 4-, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) butane, 2, 2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxyphenyl-3-methylphenyl) propane, 1,1-bis (4-hydroxy-3) Bis (hydroxyaryl) alkanes such as tert-butylphenyl) propane, bis (hydroxy) such as 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydroxyphenyl) cyclohexane Aryl) cycloalkanes, 4,4′-dihydroxydiphenyl ether, Dihydroxy diaryl ethers such as 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether, dihydroxy diaryls such as 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide Sulfides, 4,4′-dihydroxydiphenyl sulfoxide, dihydroxydiaryl sulfoxides such as 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfoxide, 4,4′-dihydroxydiphenyl sulfone, 4,4′-dihydroxy Examples include dihydroxydiaryl sulfones such as −3,3′-dimethyldiphenyl sulfone, and these may be used alone or in combination.

  It is preferable that the compounding quantity of the polycarbonate resin in the resin composition used for a core sheet is 40 weight% or more and less than 70 weight with respect to the weight of the whole resin composition. When the value is not less than the lower limit of the range, defects related to the material strength such as cracking occur due to various external stresses received when carrying the IC card. Further, if the embossed character is engraved when the value is below the upper limit of the range, the warp of the card may be increased.

  The resin composition used for the core sheet used in the present invention may contain an inorganic filler and a rubber-like elastic body, and examples of the inorganic filler include talc, mica, calcium carbonate and the like. Among these, talc having an average particle size of 0.5 to 50 μm is preferable.

  Examples of the rubber-like elastic body include acrylic polymers and methacrylic polymers mainly containing alkyl acrylate and alkyl methacrylate, diene polymers mainly containing conjugated dienes such as butadiene and isoprene, and polyorganosiloxane. There are one or more types of silicone polymer, methyl methacrylate / butyl acrylate / styrene resin, methyl methacrylate / butadiene / styrene resin (hereinafter abbreviated as MBS resin), butyl acrylate / isoprene / styrene resin, etc. A well-known thing can be used. In particular, MBS resin is preferable. Examples of rubber-like elastic bodies other than the above include butadiene rubber, styrene-butadiene rubber, acrylonitrile-butadiene-styrene, isobutylene-isoprene rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber, acrylonitrile-butadiene rubber, styrene-butadiene- Examples include styrene rubber, hydride of styrene-butadiene rubber, hydride of styrene-isoprene-styrene rubber, styrene-isoprene rubber, and the like. These rubber-like elastic bodies may be used alone or in combination of two or more.

  The card manufacturing method according to the present invention can include the step 3 of laminating an oversheet on both sides of the core sheet. By laminating the oversheet, the card can be protected against core sheet printing or oversheet. Can be printed. Moreover, when the oversheet contains polyester, when the core sheet contains a polyester resin, stable fusion between the oversheet and the core sheet can be obtained. One specific example of the method of laminating the core sheet and the oversheet is one in which pressing is performed with a configuration of a backing plate / oversheet / core sheet / oversheet / covering plate. Under the present circumstances, although pressurization conditions are also not specifically limited, It is preferable to perform press temperature at 80-150 degreeC, Preferably it is 100-130 degreeC.

  In the core sheet and oversheet used in the present invention, additives usually used as desired, for example, compatibilizers, stabilizers, lubricants, reinforcing agents, processing aids, pigments, antistatic agents, antioxidants, You may contain a neutralizing agent, a ultraviolet absorber, a dispersing agent, a thickener, other inorganic fillers, or other synthetic resins. Further, the oversheet may be further provided with a concealing layer, a protective layer and the like as required.

As a method of embedding an IC module in a card manufactured according to the present invention, for example, a card having an oversheet laminated on a core sheet is provided with a concave part of an IC module by a method such as an end mill, a drill, etc. There is a method of placing an IC module through an adhesive.

(Sheet film forming method)
The sheet used in the present invention can be obtained by a calendering method, an extrusion method, a pressing method, a casting method or the like, but is not particularly limited here. Moreover, the manufacturing method of the sheet | seat used for this invention is not specifically limited, Any conventionally well-known manufacturing methods of the resin sheet, such as a co-extrusion method, an extrusion laminating method, and a dry laminating method, can be used.

The raw materials used in the examples are as follows, and the raw materials shown in Table 1 are as follows.
(1) PETG resin: poly (ethylene-1,4-cyclohexylenedimethylene terephthalate) resin, GN071, manufactured by Eastman Chemical Japan Co., Ltd. (2) PC resin 1: polycarbonate resin, 200-3 (MFR: 3 0.0 g / 10 MIN), manufactured by Sumitomo Dow (3) PC resin 2: polycarbonate resin, E2000N (MFR: 5.0 g / 10 MIN), manufactured by Mitsubishi Engineering Plastics Co., Ltd.
(4) PC resin 3: polycarbonate resin, S-1000 (MFR: 7.5 g / 10 MIN), manufactured by Mitsubishi Engineering Plastics (5) PC resin 4: polycarbonate resin, 200-13 (MFR: 13 g / 10 MIN), Sumitomo Dow (6) PC resin 5: Polycarbonate resin, 200-22 (MFR: 22 g / 10 MIN), Sumitomo Dow (7) PC resin 6: Polycarbonate resin, H3000 (MFR: 28 g / 10 MIN) ), Manufactured by Mitsubishi Engineering Plastics Co., Ltd.

[Examples and Comparative Examples]
(Preparation of core sheet)
A resin composition for a core sheet was prepared by kneading the resin composition with two extruders with the formulation shown in Table 1 using an extruder.
Each composition was extruded into a sheet form with a single screw extruder to prepare a test sheet. The thickness of the sheet was 310 μm. The produced test sheet was subjected to an exposure test for 168 hours under the following conditions, and then a tensile test dumbbell was produced and its breaking strength was measured. The results are shown in Table 1.
(Fusibility evaluation after screen printing)
Each of the test sheets prepared as described above was cut into a size of 100 mm × 100 mm, and a screen printing solvent (manufactured by Seiko Advance: T-974) and a screen printing ink (manufactured by Seiko Advance: RAM) were placed on one side thereof. After printing the mixed ink, 50 sheets of screen-printed sheets are stacked so that the printed surfaces do not face each other, and left for 30 days in an environment of temperature and humidity of 20 ° C, 50%, (Fusing conditions: 140 ° C., 10 min, pressure 28 kg / cm ² ), and the peel strength of the fused surface was measured.
○: Material breakage ×: Delamination

  The IC card obtained by the production method of the present invention has heat resistance and high bending resistance, and has a fusion property after printing, low warpage, repeated transportation by ATM, and from the outside that can naturally be received in daily life. With respect to the stress, it can be used for a long period of time, which has been difficult to achieve in the past.

DESCRIPTION OF SYMBOLS 1 ... Sheet | seat for core sheet preparation 2 ... Oversheet 10 ... Core sheet 20 ... Card

Claims (7)

A method for producing a card, comprising: a step 1 for screen printing on a sheet; and a step 2 for obtaining a core sheet by laminating at least two sheets screen-printed in the step 1.
A method for producing a card, wherein the sheet is made of a resin composition having a breaking strength of 1.0 kgf / cm ² or more after performing the following solvent exposure test 1.
[Exposure test method:
On a petri dish containing the following solvent a so that the liquid surface height is 5 mm or more and 20 mm or less,
By disposing a sheet having a thickness of 0.31 mm so as to be 10 ± 1 mm from the surface of the solvent, the sheet is exposed to the solvent a volatile matter.
Test conditions: Exposure test time 168 hours
Environmental temperature at the time of test 25 ℃
40% humidity during testing
Solvent a: cyclohexanone] The card manufacturing method according to claim 1, wherein the resin composition contains a polyester resin. The card manufacturing method according to claim 1, wherein the resin composition contains a polycarbonate resin. 4. The card according to claim 3, wherein the polycarbonate resin has a melt flow rate [measurement method: ASTM D-1238, measurement conditions: melting temperature 300 ° C., load 1.2 kg] of 3.0 g / 10 min to 13.0 g / 10 min. Manufacturing method. The card manufacturing method according to any one of claims 2 to 4, wherein the polyester resin is a copolymerized polyester resin obtained by substituting 10 to 70 mol% of an ethylene glycol component of polyethylene terephthalate with cyclohexanedimethanol. The card manufacturing method according to claim 1, further comprising a step 3 of laminating an oversheet on both sides of the core sheet.   The card manufacturing method according to claim 6, wherein the oversheet contains a polyester resin.