JP2005126632A - Ink, card using the ink, and method for manufacturing the card - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide ink capable of preventing hydrochloric gas from arising at the incineration of a card solving the problem in environmental adequacy since hydrochloric gas is generated at the incineration of a printed matter when polyvinyl chloride is used as a binder resin for ink used in a print layer even if an amorphous polyester or the like is used as a substrate of the card, to provide a card using the ink and a method for manufacturing the card. <P>SOLUTION: The ink comprises at least a resin used as a binder and a solvent dissolving the resin and further slaked lime mixed therein. The card is characterized in that at least a layer among a picture-printed layer, a concealing layer concealing a magnetic recording part and a protection layer is printed with ink containing slaked lime. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a magnetic recording medium used for, for example, a cash card, a credit card, an ID card (identification card), a membership card, and the like, and is used for home appliances such as vehicles and computers that can be stored at high temperatures. The present invention also relates to a card that is not deformed even when used in a product, and that is more easily discarded when it is discarded after use.

  Conventionally, magnetic recording media have been widely used in the fields of cash cards, credit cards, ID cards, etc., and mainly used are polyvinyl chloride (PVC) resins and vinyl chloride / vinyl acetate copolymers. In particular, polyvinyl chloride resin is common. Polyvinyl chloride resin is excellent in physical mechanical properties and embossability of character parts, and is still widely used as a perfect material as a card material.

  As a general card manufacturing method, printing is performed on a white vinyl chloride (PVC) base material by a known printing method such as offset printing, gravure printing, screen printing, and a highly transparent PVC sheet (oversheet) on both sides thereof. After being laminated, the magnetic tape is transferred, integrated by heat fusion with a heating press, and punched out with a die of a predetermined size into a card shape. The thermal transfer type magnetic tape is raised from the surface of the card after transfer and has a level difference, but is embedded during thermal fusion with a heating press and is flush with the surface of the card.

  The role of the magnetic tape in the magnetic card is to record the personal data possessed by the individual and read it at the time of use. This magnetic tape is flush with the card surface. Otherwise, there is a risk that the edge of the tape may be damaged or lost due to carrying with a card holder or repeated use with a reader / writer, resulting in an unusable card.

  Incidentally, the state of the card surface stipulated in JISX6301 4.2.6 is: “From each circumference of the magnetic stripe, in the 6.35 mm area, normal writing of information on the magnetic stripe or information recorded on the magnetic stripe Do not provide surface discontinuities that may impair normal reading.In addition, in Type II, do not provide 0.05 mm or more protrusions in the range of 24 mm or more from the lower end of the card. is there.

  By the way, the disadvantage of the physical properties of the vinyl chloride resin is low heat resistance. In general, since vinyl chloride resin is softened and deformed at about 60 ° C., it is not suitable for high temperature applications such as home appliances and in-vehicle use. Recently, magnetic recording media are not limited to the fields of cash cards, credit cards, ID cards, etc., but contactless IC cards with magnetic stripes embedded with contact IC chips and non-contact IC cards with magnetic stripes incorporating antennas and IC modules, There are various kinds of cards including all of them, and applications include electronic wallets, commuter passes, telephone cards, licenses, car-mounted cards, etc. The materials used for these cards are more flexible than conventional cards. High reliability including strength such as scratch strength and tensile strength and resistance such as storage characteristics, heat resistance and chemical resistance is required.

Polyvinyl chloride resin is excellent in physical properties, processability, and economics, but when it is discarded after use, it generates hydrogen chloride gas especially during incineration and damages the furnace, shortening the service life, and the relationship with dioxin is clear. Although this is not the case, movements of de-PVC have become active in countries such as Germany and Northern Europe due to this problem, and the trend is in the building materials and industrial materials fields in Japan.

  Therefore, there is an idea of using other resins, and there are thermoplastic resins not containing halogen such as polyethylene resin, polypropylene resin, polyester resin, polycarbonate resin, polyacrylic resin, etc., but these resins are formed into a card shape by itself. However, since the physical properties are quite different from those of vinyl chloride resin, some ingenuity is required.

  On the other hand, polyethylene terephthalate, a kind of polyester resin, is produced by polycondensation of terephthalic acid and ethylene glycol, but the crystallinity is increased by stretching orientation and heat setting in the sheet manufacturing process, or a crystal nucleating agent instead of stretching By adding, a high-strength sheet with high crystallinity can be obtained. However, in an unstretched state or a system using terephthalic acid and isophthalic acid, a low crystalline sheet with low crystallinity can be produced, and a sheet made from a copolymer of terephthalic acid, cyclohexanedimethanol and ethylene glycol is also low. It is a crystalline sheet.

  When polyvinyl chloride is used as the binder resin in the ink, hydrogen chloride gas is generated when the printed matter after printing is burned, which causes a problem in environmental suitability.

  In addition, if the printed layer on the card substrate such as a magnetic card, IC card, employee card, membership card, etc. is used with the ink using polyvinyl chloride as the binder resin described above, hydrogen chloride gas will be emitted when the card is burned. Therefore, there was a problem on environmental suitability.

  Until now, polyvinyl chloride has been widely used for card substrates. Polyvinyl chloride has a high possibility of generating hydrogen chloride gas during incineration, and the card substrate is required to be non-vinyl chloride. Amorphous consisting of a copolymer of an acid with cyclohexanedimethanol and ethylene glycol, a copolymer of terephthalic acid with isophthalic acid and ethylene glycol, or a polymer alloy of the copolymer with polycarbonate and / or polyarylate Polyester, etc. have been used, but even if these are used, when polyvinyl chloride is used as the binder resin in the ink used for the printed layer, hydrogen chloride gas is generated when the printed matter is burned after printing, which is environmentally friendly. There was a problem.

  Thus, the possibility that hydrogen chloride gas is generated during the burning of the card has been pointed out, and a method for greatly preventing the generation of hydrogen chloride gas has been demanded.

  The present invention solves such a problem, and in the present invention according to claim 1, an ink comprising at least a resin used for a binder and a solvent for dissolving the resin, wherein slaked lime is mixed. It is to provide.

  Further, in the present invention according to claim 2, at least any one of the pattern printing layer, the hiding layer for hiding the magnetic recording portion, or the protective layer is printed with ink containing slaked lime. The card is provided.

Moreover, in this invention which concerns on Claim 3, the base material sheet used for the said card | curd is a copolymer of a polyvinyl chloride or a terephthalic acid, a cyclohexane dimethanol, and ethylene glycol, a terephthalic acid, an isophthalic acid, and ethylene glycol. A card according to claim 2, wherein a non-crystalline polyester made of a polymer alloy of the above and a copolymer alloy of the copolymer and polycarbonate and / or polyarylate is used as a main component. It is to provide.

  The invention of claim 4 according to claim 4 further comprises at least one information recording means of an IC module, a magnetic recording layer, or a reversible thermosensitive recording layer. The card of description is provided.

  Further, in the present invention according to claim 5, the ink used for the card contains a substance that reduces at least one of hydrogen chloride, sulfur oxide, and nitrogen oxide. The card according to any one of claims 2 to 4 is provided.

  Further, in the present invention according to claim 6, the card according to claim 5, wherein the substance is slaked lime, and the main component is at least either calcium hydroxide or calcium oxide. To do.

  Further, in the present invention according to claim 7, at least any one of the pattern printing layer, the hiding layer for hiding the magnetic recording portion, or the protective layer is printed with ink containing slaked lime. The card manufacturing method according to claim 2, wherein the card manufacturing method is provided.

  This slaked lime reacts efficiently with hydrogen chloride gas generated in the incinerator during incineration to produce harmless calcium chloride. Thus, the present invention proposes an ink capable of preventing the generation of hydrogen chloride gas at the time of incineration of the printed matter after printing, a card produced using the ink, and a method for producing the card.

  Embodiments of the present invention will be described below.

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

  In FIG. 1, the resin used for the ink in the present invention is polyvinyl chloride, but also includes vinyl chloride-vinyl acetate copolymer, polyester resin, acrylic resin, epoxy resin, phenol resin, and other vinyl resins.

  In addition, the resin used for the card base sheet in the present invention is polyvinyl chloride in FIG. 1, but the amorphous polyester resin is also a polymer alloy of polyethylene terephthalate or polyethylene terephthalate and polycardinate and / or polyarylate. Including.

  In addition, an amorphous polyester obtained by copolymerizing ethylene glycol and cyclohexanedimethanol with terephthalic acid is also included.

  Each of the amorphous polyester sheet and the heat-resistant sheet layer in the present invention can be formed into a sheet by an extrusion method.

  Next, the card manufacturing method using the card material in the present invention includes a melt laminating method using a hot press machine. In the melt laminating method, transparent protective sheets are laminated on both sides of a printed substrate, but the types of protective sheets on both sides may be different. The melt laminating method is a method in which a card material is integrated by a hot melt press after being sandwiched between slightly larger mirror plates.

  As the mirror plate used at this time, a nickel-chromium plated copper plate, a stainless steel plate having a polished surface, an aluminum plate having a polished surface, or the like can be used. In addition, printing on the substrate can print characters or designs by the same method as that for paper or plastic film, that is, a known printing method such as an offset printing method, a screen printing method, or a gravure printing method.

  After the melt lamination, the card material is peeled off from the mirror surface plate and punched into a card shape by punching with a single blade or a male-female die to obtain a card substrate.

  For example, a magnetic recording layer can be provided on the card base, and a conventional thermal transfer type magnetic tape can be transferred to one or both sides of the card base, or the card base can be directly magnetized. A method of printing the recording layer is used.

  Usually, after becoming a card shape, embossed characters are embossed with an embosser and colored by tipping on the characters with a thermal transfer foil, magnetic information is encoded on the magnetic recording layer, Transfer the barcode and finish the card. And a protective layer can also be provided in order to improve tolerance, such as abrasion of a character and a pattern printing layer.

  Since various physical properties as a card are not sufficient with the above resin alone, the resin can be modified by adding and kneading various fillers and additives to these resins. Fillers added to these resins include, for example, heavy calcium carbonate, light calcium carbonate, natural silica, kaolin, clay, titanium oxide, barium sulfate, zinc oxide, aluminum hydroxide, alumina, magnesium hydroxide in amorphous fillers, etc. Can be added and kneaded. Also, talc, mica glass flakes, etc. can be added and kneaded in the plate-like filler. Aluminum borate and the like can be added and kneaded. Of these, titanium oxide is often used as a white pigment to be added to the resin. Talc is often used to improve embossability. By kneading the filler, properties such as rigidity, durability, heat distortion resistance, molding processability, impact resistance strength, dimensional stability, and the like can be improved. The aforementioned fillers can be added alone, but several kinds can be added simultaneously. The filler is selected and used according to the target physical property value.

  Polyvinyl chloride has been widely used for card base sheets. Polyvinyl chloride contains chlorine, and hydrogen chloride gas is likely to be generated during incineration. Dioxins are also caused by this hydrogen chloride gas. The possibility of occurrence has also been pointed out.

  In view of this, it is conceivable to use a non-vinyl chloride base sheet as the base material of the card. As a substitute for vinyl chloride, the above-mentioned resins having polyester as a main component can be cited, and they have been used for cards so far.

  By the way, although the printing method to such a card | curd base material is as above-mentioned, the ink used for it is polyvinyl chloride, a vinyl chloride-vinyl acetate copolymer, an acrylic resin, a polyester resin, a binder resin until now. Many polyurethane resins or epoxy resins were used.

  As described above, polyvinyl chloride contains chlorine, and hydrogen chloride gas is likely to be generated during incineration. It has also been pointed out that dioxins may be generated due to this hydrogen chloride gas. In addition, it is pointed out that hydrogen chloride gas may be generated depending on the combustion conditions even with acrylic resin, polyester resin, polyurethane resin, epoxy resin, etc. that do not contain chlorine, and there are other methods to prevent the generation of hydrogen chloride gas. It has been sought.

As a countermeasure against this, in the present invention (FIG. 1), printing is performed with ink using a resin added with slaked lime as a binder. Slaked lime is mainly composed of either calcium hydroxide or calcium oxide. These react efficiently with hydrogen chloride gas generated during incineration to form calcium chloride. The reaction formula is Ca (OH) ₂ + 2HCl → CaCl ₂ + 2H ₂ O.

  The calcium chloride that is produced does not decompose even under high temperature conditions in the incinerator. This calcium chloride is used as a snow melting agent and food additive, and is harmless. In addition, unreacted calcium hydroxide (slaked lime) is used as a soil conditioner in fields and the like, which is also harmless.

The present invention relates to an ink using a binder resin having a high ability to remove hydrogen chloride, which is likely to occur during combustion, a card made from the ink, and a method for producing the same, but it prevents the generation of hydrogen chloride. Therefore, it is possible to reduce acid gases such as SO _x and NO _{x that} cause acid rain. Moreover, it can be said that it is an ecological invention which can also prevent deterioration by the acidic substance of an incinerator wall.

(Example 1)
FIG. 1 shows a cross-sectional view of the card of the first embodiment.

    First, a varnish of a screen ink was prepared by dissolving vinyl chloride-vinyl acetate copolymer resin pellets, slaked lime mainly composed of calcium hydroxide and cyclohexanone as a solvent in a ratio of 20/5/75 by weight. An aluminum paste as a silver pigment was mixed with the produced screen ink in an amount of 8% by weight with respect to the varnish to produce a silver ink.

    Next, with this ink prepared, a pattern printing layer was applied to the front and back surfaces of white amorphous polyester (PETG) sheet 1 (Mitsubishi Resin Co., Ltd .: WHI) with a thickness of 0.6 mm by screen printing. did. A transparent amorphous polyester (PETG) sheet 5 (Mitsubishi Resin Co., Ltd .: CHI) having a thickness of 0.1 mm, having a magnetic tape 4 transferred to the surface of the sheet 1, and the same sheet 6 are stacked on the back surface to smooth the surface. It was sandwiched between stainless steel plates made and pressed and heat-sealed at 130 ° C. for 30 minutes to cool and solidify. It was then punched into a card shape to make a card.

  In this card, since slaked lime is mixed in the resin of the printing layer, 80% or more of hydrogen chloride gas generated during incineration combustion is reacted with harmless calcium chloride.

  Since the card | curd of Example 1 is comprised with the base material sheet | seat which has a polyester as a main component, and the printed layer is vinyl chloride-vinyl acetate resin containing slaked lime, 80% or more of the hydrogen chloride gas produced | generated at the time of incineration combustion is contained. Reacted with calcium chloride. This reaction product, calcium chloride, is harmless.

(Comparative Example 1)
FIG. 2 shows a cross-sectional view of the card of Comparative Example 1.

    First, a vinyl chloride-vinyl acetate copolymer resin pellet and a solvent cyclohexanone were dissolved at a ratio of 20/80% by weight to prepare a screen ink varnish. An aluminum paste as a silver pigment was mixed with the produced screen ink in an amount of 8% by weight with respect to the varnish to produce a silver ink.

    Next, with this ink prepared, 8 and 9 pattern printing layers were applied by screen printing on the front and back surfaces of 0.6 mm thick white amorphous polyester (PETG) sheet 7 (Mitsubishi Resin Co., Ltd .: WHI). did. A transparent amorphous polyester (PETG) sheet 11 (Mitsubishi Resin Co., Ltd .: CHI) having a thickness of 0.1 mm with the magnetic tape 10 transferred to the surface of the sheet 7 is laminated on the back surface, and the surface is smoothed. It was sandwiched between stainless steel plates made and pressed and heat-sealed at 130 ° C. for 30 minutes to cool and solidify. It was then punched into a card shape to make a card.

  The card of Comparative Example 1 is made of a base material sheet containing polyester as a main component, as in Example 1. However, since the printing layer is composed of a vinyl chloride-vinyl acetate resin-based ink that does not contain slaked lime, hydrogen chloride gas is generated during incineration combustion. The hydrogen chloride gas itself is harmful, but it is highly possible that dioxins are generated based on the gas.

  The present invention can be applied to magnetic recording media used for cash cards, credit cards, ID cards (identification cards), membership cards, and the like.

It is explanatory drawing which shows the cross section of the card | curd of Example 1 of this invention. It is explanatory drawing which shows the cross section of the card | curd of the comparative example 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 7 ... White amorphous polypolyester (PETG) sheet 5, 6, 11, 12 ... Transparent amorphous polypolyester (PETG) sheet 2, 3, ... Printed with ink mixed with slaked lime Patterns printed, character print layers 8, 9... Printed with ink not mixed with slaked lime, character print layers 4, 10... Magnetic recording layer

Claims (7)

  An ink comprising at least a resin used for a binder and a solvent for dissolving the resin, and mixed with slaked lime.   A card, wherein at least one of a pattern printing layer, a concealing layer for concealing a magnetic recording portion, or a protective layer is printed with ink containing slaked lime.   The base sheet used for the card is a copolymer of polyvinyl chloride or terephthalic acid, cyclohexanedimethanol and ethylene glycol, a copolymer of terephthalic acid, isophthalic acid and ethylene glycol, or a copolymer thereof. 3. The card according to claim 2, wherein amorphous polyester made of a polymer alloy of polycarbonate and / or polyarylate is used as a main component.   4. The card according to claim 2, further comprising at least one information recording means of an IC module, a magnetic recording layer, or a reversible thermosensitive recording layer.   The ink used for a card | curd contains the substance which reduces the gas of at least any one of hydrogen chloride, a sulfur oxide, or a nitrogen oxide, The any one of Claim 2 thru | or 4 characterized by the above-mentioned. card.   The card according to claim 5, wherein the substance is slaked lime, and the main component thereof is at least either calcium hydroxide or calcium oxide.   7. The printed printing layer, the concealing layer for concealing the magnetic recording portion, or the protective layer is produced by printing with an ink containing slaked lime. The manufacturing method of the card | curd in any one of.

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