JP2013001090A - Card sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a card sheet excellent not only in heat resistance and heat fusibility but also in laser marking properties, also excellent in the sheet feed properties in a card lamination process and the mold releasability or the like from a mold after heat press and equipped with heat resistance, folding properties and transparency.SOLUTION: The card sheet excellent in heat resistance and heat fusibility is formed of at least a three-layered sheet having core layers between skin layers and laminated by a co-extrusion method and at least one of the skin layers or core layers comprises a polymer alloy composed of 80-20 mass% of non-crystalline aromatic polyester resin with a glass transition temperature of 90°C or higher and 20-80 mass% of polycarbonate resin. The total thickness of the three-layered sheet is 50-400 μm and the ratio of the thickness of the core layers to the total thickness of the three-layered sheet is ≥25 and <85%.

Description

  The present invention relates to a card sheet used for various cards, particularly plastic cards such as contact type and non-contact type IC cards, and in particular, has a multilayer structure and is used as an oversheet or a core sheet for a card, and has heat resistance and heating. The present invention relates to a card sheet having excellent fusing property, and further having a laser marking function capable of obtaining clear characters, symbols, and images with high contrast between a fabric color and a printed portion by laser light energy irradiation. .

  A plastic card such as a credit card, a cash card, an ID card, or a tag card is first laminated with a plurality of sheets and heat-sealed between the sheets by a vacuum press. After fusing, it is manufactured into a punched card shape with a punching machine. Conventionally, a polyvinyl chloride resin (hereinafter abbreviated as PVC) is used for these sheet materials. This PVC generates halogen gas at the time of incineration and damages the incinerator or generates environmental problems when released into the atmosphere. Therefore, a sheet made of a non-crystalline aromatic polyester resin (hereinafter abbreviated as PETG) has begun to be used. However, cards using PVC or PETG sheets have insufficient heat resistance. For example, these cards can be left in an automobile cabin in a country with a hot climate or installed in an ETC in-vehicle device installed in an automobile cabin. If the IC card is left inserted, the former may be warped or the like may be deformed, and the latter may be a problem that the card cannot be removed from the ETC on-vehicle device due to the deformation of the card. In order to solve these problems, heat resistance is improved by melt-kneading a polycarbonate resin (hereinafter abbreviated as PC) with PETG, but the printability, for example, offset printability is reduced. There is a problem such as. On the other hand, a laser marking method for marking characters and images by irradiating laser light energy has been widely adopted especially overseas because of the increasing security problem. However, laser marking on PVC and PETG sheets has poor color developability, and there is a problem of lack of visibility of characters and images. To solve this problem, as described above, laser marking performance is improved by polymer alloying PCG into PETG by melt kneading, but in order to demonstrate sufficient laser marking performance, the PC ratio is increased. In such a case, sufficient heat fusion between sheets cannot be ensured under the same temperature condition as PVC or PETG in the hot press process, and the hot press temperature must be raised. Then, in the vacuum press machine, the temperature rises from room temperature to the set temperature, and after that, after pressurizing, the cycle time of one step of cooling to room temperature becomes long, resulting in a decrease in productivity. Furthermore, since laser marking is monochromatic (generally black), there is an increasing demand for monochromatic characters and full color images. For this purpose, an ink-receiving layer coat for sublimation thermal transfer color printing is applied to the surface of the card oversheet capable of laser marking so as to correspond to partial full-color printing.

  In order to solve these problems, Patent Document 9 discloses a non-laser marking type card core sheet or oversheet, which has a core layer between skin layers and is laminated by a coextrusion method. The skin layer is made of a substantially non-crystalline aromatic polyester resin composition, the core layer is made of a polycarbonate resin composition, and the ratio of the thickness of the core layer in all sheets is Sheets of 50% or more and less than 100% are disclosed. On the other hand, as a sheet for performing laser marking, for example, there are Patent Documents 1 to 5 and the like. On the other hand, in Patent Document 6, as a multilayer structure excellent in laser marking, a sheet of transparent thermoplastic resin, on the back of a film It is stated that a multilayer sheet laminated with an elastomer and heat sealed is preferred. Furthermore, Patent Document 7 and Patent Document 8 propose a multilayer sheet for laser marking suitable for a card having good contrast and smooth laser marking properties and heat resistance.

  Furthermore, Patent Document 10 describes a card sheet having a color developing layer and an adhesive layer on at least one surface thereof. The color-developing layer is mainly composed of a polymer alloy of PC and substantially non-crystalline PETG and is colored by irradiation with a laser beam, and the adhesive layer is substantially composed of non-crystalline PETG. ing. There has been proposed a card sheet in which the glass transition temperature of the color forming layer forming main component is higher than that of the resin forming the adhesive layer, and the glass transition temperature of the resin forming the adhesive layer is 80 ° C. Here, a resin having a glass transition temperature of 60 ° C. or 80 ° C. is used as PETG constituting the polymer alloy, and a resin having a glass transition temperature of 160 ° C. is used as PC. Further, a card sheet is disclosed in which the glass transition temperature of the polymer alloy of the coloring layer is 90 ° C. or 130 ° C., and the glass transition temperature of the adhesive layer is 80 ° C.

Japanese Examined Patent Publication No. 61-11771 Japanese Examined Patent Publication No. 62-59663 Japanese Examined Patent Publication No. 61-41320 JP-A 61-192737 Japanese Examined Patent Publication No. 2-47314 JP-A-7-276575 JP 2002-273732 A Japanese Patent No. 3889431 Japanese Patent No. 3876107 Japanese Patent No. 4490639

  However, in the said patent document 9, as a resin which comprises a skin layer, PETG (brand name, the Eastman Chemical company make) whose glass transition temperature is 80 degreeC is illustrated, and it is used in the Example. However, the PC constituting the core layer (for example, “Novalex 7022” used in the examples, manufactured by Mitsubishi Engineering Plastics Co., Ltd.) has a glass transition temperature of 160 ° C., and the difference between the two glass transition temperatures is Since the temperature is about 80 ° C., it is difficult to make the outer skin layers uniform by the co-extrusion method by multilayer co-extrusion molding of two types and three layers. In addition, since the skin layer is poor in heat resistance, there is a problem that the releasability at the time of taking out from the mold is inferior in the heat lamination process with another sheet by a vacuum press. Furthermore, when the ink receiving layer coating for sublimation thermal transfer color printing is applied to the surface of the sheet, the skin layer resin has poor heat resistance, so that “wrinkles” are formed on the sheet in the drying process after the coating material is applied. A problem arises.

  In Patent Document 10 described above, since the glass transition temperature of PETG constituting the polymer alloy as the main component of the color developing layer is 60 ° C. or 80 ° C., even if an attempt is made to increase the glass transition temperature of the polymer alloy, There is a limit. An adhesive layer formed by co-extrusion of such a color-forming layer made of a polymer alloy and an adhesive layer made of PETG having a glass transition temperature of 80 ° C. by a co-extrusion method has poor heat resistance. It is inferior in releasability at the time of taking out from a metal mold | die in the heating lamination process with the sheet | seat of a vacuum press machine. Furthermore, since the heat resistance of the adhesive layer resin is poor, there is a problem that “wrinkles” occur in the drying process and the like. There is also a problem that printability, for example, offset printability is deteriorated.

  On the other hand, when the method in consideration of the laser marking disclosed in Patent Documents 1 to 5 is applied to a plastic multilayer sheet having a surface transparent skin layer as it is, various problems occur. That is, Patent Document 6 describes that a transparent thermoplastic resin sheet, a multilayer sheet laminated with an elastomer on the back of a film, and heat-sealed are preferable, but in this multilayer sheet, the adhesion between the skin layer and the inner layer is preferred. If the property is poor, there is a problem that the transparent skin layer swells or is damaged by the gas generated at the time of marking depending on the conditions of laser marking on the inner layer, which is an energy absorber of laser light energy.

  In order to solve this problem, Patent Document 7 and Patent Document 8 propose a multilayer sheet for laser marking suitable for cards having good contrast and smooth laser marking properties and heat resistance. In general, when manufacturing a card, a sheet is sucked and conveyed by vacuum suction in a process of stacking a plurality of sheets. Then, the negative pressure is released at a predetermined position and the sheets are stacked. Subsequently, the sheets are heat-sealed with a hot press and then cut into a card shape with a punching blade. In these manufacturing processes, when the proposed multilayer sheet for laser marking is applied to an oversheet of a card, there is a problem that the sheet sticks to the transport machine even if the negative pressure is released in the sheet transport process. In addition, there is a problem that the oversheet sticks to the mold in the process of heat-sealing the sheets with a hot press (mold stick), and further, laser gas energy is irradiated at the interface between the core sheet and the oversheet due to poor gas escape. In this case, there is a problem that gas burning occurs in this portion and the transparent skin layer swells or is damaged, and further improvement is required.

  On the other hand, after heating and laminating oversheet (transparent) / core sheet (white) / oversheet (transparent), punching is performed to produce a blank card (white), and color printing is performed on the card surface with a card printer. There is a method for manufacturing a predetermined card. In this case, the card printing method is roughly divided into a direct thermal transfer printing method and an indirect thermal transfer printing method. In the former, sublimation ink is printed on the card surface by pressing the ink ribbon directly on the card surface and heating. The At this time, if the oversheet is PVC, clear printing is possible without problems. However, the PETG / PC / PETG three-layer sheet is not preferable because the sublimation type ink is not “familiar” with these sheets and printing becomes unclear or a phenomenon in which printing is partially lost occurs. For this reason, water-based and solvent-based thin film coating is applied to the surface of these sheets. If the heat resistance of the oversheet is insufficient, the sheet is wound in the winding process after the drying process. However, there is a problem that the sheet is not able to withstand the tension at the time of winding and “wrinkles” are formed in the sheet or the sheet is stretched.

  The present invention has been made to solve the above problems, and relates to a card sheet used for various cards, particularly plastic cards such as contact type and non-contact type IC cards. An oversheet or core sheet for a card that has excellent fusing properties, and has a laser marking function that can provide clear characters, symbols, and images with high contrast between the fabric color and the printed part by laser light energy irradiation. It is about. It is another object of the present invention to provide a plastic card oversheet having heat resistance capable of withstanding a thin film coating / drying process capable of sublimation thermal transfer printing.

  The sheet having a multilayer structure according to the present invention is used as an oversheet used as a surface layer of a card as described above, or a core sheet used by being sandwiched between oversheets. Moreover, it is used suitably for the base material sheet | seat for inlet sheets which arrange | positioned IC-CHIP and an antenna.

  The present invention provides the following card sheet.

[1] A card sheet having a core layer between skin layers and formed of at least three layers laminated by a coextrusion method, wherein at least the skin layer or the core layer of the three-layer sheet One layer is composed of a polymer alloy of 80 to 20% by mass of a non-crystalline aromatic polyester resin having a glass transition temperature of 90 ° C. or more and 20 to 80% by mass of a polycarbonate resin, and the total thickness of the three-layer sheet is A card sheet excellent in heat resistance and heat-fusibility comprising 50 to 400 μm, and the ratio of the thickness of the core layer to the total thickness of the three-layer sheet being 25% or more and less than 85%.

[2] The core layer comprises a polycarbonate resin or a polymer alloy of 80 to 20% by mass of a non-crystalline aromatic polyester resin having a glass transition temperature of 90 ° C. or more and 20 to 80% by mass of a polycarbonate resin, The card sheet according to [1], wherein the laser light energy absorber is contained in an amount of 0.0001 to 3 parts by mass with respect to 100 parts by mass of the resin or polymer alloy.

[3] The skin layer, which is both outermost layers of the three-layer sheet, is a non-crystalline aromatic polyester resin having a glass transition temperature of 90 ° C. or higher, or a non-crystalline aromatic polyester type having a glass transition temperature of 90 ° C. or higher. The three-layer sheet is composed of a composition containing 5 parts by mass or more of a white inorganic pigment with respect to 100 parts by mass of a polymer alloy composed of 80 to 20% by mass of a resin and 20 to 80% by mass of a polycarbonate resin. The card sheet according to [1] or [2], wherein at least one surface is subjected to mat processing with an average roughness (Ra) of 0.1 to 10 μm.

  According to the present invention, a card sheet having excellent heat resistance and heat fusion property can be obtained. Moreover, even when laminating by a co-extrusion method, uniformization can be easily performed. Furthermore, in the heat lamination process by a vacuum press machine with other sheets, it is excellent in releasability at the time of taking out from the mold. In addition, the sheet containing the laser light energy absorber has a high contrast between the fabric color and the printed part, and clear characters, symbols, and images can be obtained by laser light energy irradiation. Furthermore, when a coating is applied to the surface of the skin layer of the sheet to provide an ink receiving function for sublimation thermal transfer color printing, “wrinkles” do not occur in the drying process after the coating. Also, it can withstand thin film coating and drying processes capable of sublimation thermal transfer printing, and has an excellent effect of providing a card sheet used for various cards, particularly plastic cards such as contact type and non-contact type IC cards. .

  Hereinafter, the form for implementing the card | curd sheet | seat of this invention is demonstrated concretely. However, the present invention broadly encompasses card sheets having the invention-specific matters, and is not limited to the following embodiments.

[1] Configuration of the card sheet of the present invention:
The card | curd sheet | seat of this invention has a skin layer and a core layer, and is formed from the sheet | seat of the at least 3 layer laminated | stacked by the coextrusion method. At least one of the skin layer or the core layer of the three-layer sheet is composed of 80 to 20% by mass of a non-crystalline aromatic polyester resin (hereinafter abbreviated as PCT resin) having a glass transition temperature of 90 ° C. or more and polycarbonate. Made of a polymer alloy (hereinafter abbreviated as an alloy-based resin) of 20 to 80% by mass of a resin based resin (hereinafter abbreviated as a PC-based resin), the total thickness of the three-layer sheet is 50 to 400 μm, and the core layer Is a sheet for a card excellent in heat resistance and heat-fusibility, and the proportion of the total thickness of the three-layer sheet is 25% or more and less than 85%.

  In the present invention, it is necessary that at least one of the skin layer and the core layer is composed of an alloy resin having the specific composition described above. When the card sheet of the present invention is a sheet having a three-layer structure in which a core layer is disposed between skin layers, all of the three layers are composed of an alloy resin having the specific composition described above. Sheet, a sheet in which only the core layer is composed of an alloy resin having the above-mentioned specific composition, or both layers or one layer of the skin layer is composed of an alloy-based resin having the above-mentioned specific composition. Embodiments can be mentioned.

  Among the embodiments described above, the core layer is composed of an alloy-based resin having the above-described specific composition, and the skin layer is composed of a PCT-based resin, or the core layer is composed of a PC-based resin, The card | curd sheet | seat comprised from the alloy-type resin which a skin layer consists of an above-described specific composition is preferable. The former sheet has heat-fusibility when co-extrusion laminating three layers, and heat-fusibility when laminating with other sheets (for example, a core sheet, an intermediate sheet, and an oversheet constituting a card), bubbles Excellent slipping. Moreover, when it laminates | stacks with another sheet | seat, it has favorable heat resistance and transparency. Furthermore, the surface gloss is good and the visibility is excellent. In addition to the above-described sheet, the latter sheet has a skin layer made of an alloy resin. Therefore, by changing the types and ratios of the PCT resin and the PC resin constituting the alloy resin, the PCT The advantages of the resin and the PC resin can be brought out, and an effect difficult to obtain with a single composition can be imparted.

[1-1] Three-layer sheet:
The three-layer sheet is configured as a sheet having at least a three-layer structure including a skin layer and a core layer, and is laminated by a coextrusion method. As described above, the three-layer sheet according to the present invention is “at least three layers” and is not limited to a sheet having a three-layer structure. In other words, as long as it is composed of 3 layers or more, it is included in the multilayer sheet of the present invention, whether it is composed of 5 layers, 7 layers, or more odd layers. This is the purpose. In the card sheet of the present invention, “three-layer sheet” means for convenience of explanation, and “three-layer sheet” means “a sheet composed of at least three layers”. However, it is not intended to limit the sheet to “three layers”. However, even when the card sheet according to the present invention is configured from such a multilayer, the skin layer described below is disposed at the outermost position of the sheet configured from the multilayer, and Arranged on both sides of the sheet. Furthermore, it is necessary to arrange the multilayer sheet so as to be sandwiched between the skin layers, and the thickness must be within a predetermined range described later. Here, it is further noted that “an odd number of layers” is also included in the “three-layer sheet” of the present invention. However, since the total thickness is defined, in the card sheet composed of too many layers, the layer thickness per layer of the skin layer and the core layer to be arranged becomes too thin, and in the heat press process at the time of card lamination The mold stick will occur. Therefore, a card sheet composed of 5 layers and more preferably 3 layers is preferable.

  As described above, the reason why the sheet is composed of the odd layers is that the multilayer sheet composed of the even layers always has the same structure as the multilayer sheet composed of the odd layers. For example, in a multilayer sheet composed of four layers, the layers are arranged such as skin layer (PCT resin) / core layer (alloy resin) / core layer (alloy resin) / skin layer (PCT resin). After all, this is because the structure is the same as that of a multilayer sheet composed of odd layers.

  For example, taking a card sheet composed of three layers as an example, skin layer (PCT resin) / core layer (alloy resin) / skin layer (PCT resin), or skin layer (alloy resin) / Two skin layers are arranged on the outermost side of one and the other so that the layer arrangement of core layer (PCT resin) / skin layer (alloy resin) is made. One core layer is arranged so as to be sandwiched between the two skin layers to form a card sheet. Taking a card sheet composed of five layers as an example, skin layer (PCT resin) / core layer (alloy resin) / skin layer (PCT resin) / core layer (alloy resin) / skin layer (PCT resin), the two skin layers are arranged on the outermost side of one and the other, and the skin layer and the core layer are alternately arranged so that the card sheet is It may be formed.

  By forming a card sheet having a multilayer structure as described above, for example, in a card composed of an oversheet / core sheet / core sheet / oversheet, it is sufficient for each layer in a heating lamination process in a vacuum press machine or the like. Can be secured. Furthermore, it can be smoothly removed from the mold after the hot pressing. On the other hand, even in a harsh environment where a card is left inserted in an ETC on-board device installed in a car in a country with a hot climate, or when the card is left on the dashboard, A card having excellent heat resistance, such as being able to suppress deformation of warp or the like, can be provided, and both conflicting performances such as heat fusion and heat resistance can be achieved.

  The total thickness (total thickness) of the card sheet configured as described above needs to be formed to a thickness of 50 to 400 μm. When the total thickness of the sheet is less than 50 μm, it is difficult to control the thickness of the skin layer and the core layer during coextrusion sheet molding, and the thickness uniformity of the skin layers on both sides of the core layer can be controlled. As a result, a non-uniform thickness sheet (three-layer sheet) is produced. Since the thickness of the skin layers on both sides is not uniform, for example, in the case of a three-layer sheet, the warpage of the three-layer sheet occurs from the difference in the expansion coefficient between the skin layer resin and the core layer resin after the sheet molding. This is not preferable because a problem that the handling of the sheet becomes difficult in the sheet conveying and laminating process occurs. If the total thickness of the three-layer sheet exceeds 400 μm, one sheet occupies 50% or more of the maximum thickness of 800 μm, which is the standard for general contact and non-contact cards. For example, it becomes difficult to use in a card composed of an oversheet / core sheet / core sheet / oversheet. Further, the relationship between the total thickness of the entire three-layer sheet and the thicknesses of the skin layer and the core layer will be described in detail later.

[1-2] Skin layer:
The skin layer is configured as both outermost layers arranged on the outside of the three-layer sheet. That is, this skin layer plays a role as a surface layer (both outermost layers) of a three-layer sheet disposed so as to be sandwiched from both end surfaces (outside) of the core layer described later.

  Here, it is preferable that the thicknesses of the skin layers disposed on both outermost layers sandwiching the core layer are the same. This is because if the card sheet is composed of skin layers having different thicknesses, the sheet is warped in the sheet co-extrusion molding process or the like as described above. Further, the thickness of the skin layer is preferably 10 to 50 μm on one side, and more preferably 15 to 40 μm. When the thickness of the skin layer is too thin, the generation of a mold stick and a decrease in heat fusion property occur. On the other hand, if the thickness of the skin layer is too thick, the thickness of the core layer, which will be described later, is inevitably reduced, which causes problems such as warping of the card after stacking the cards. is there. As a material (raw material) for forming the skin layer, a PCT resin or an alloy resin is used.

[1-3] Core layer:
The core layer is configured as a so-called core layer disposed in the center of the three-layer sheet. That is, this core layer is formed as a core layer of a three-layer sheet so as to be sandwiched between two skin layers disposed on the outermost side. The thickness of the core layer needs to be formed so that the ratio of the thickness in the entire sheet is 25% or more and less than 85%, and more preferably 50% or more and 75% or less. It is. When the thickness ratio of the core layer is 85% or more, the total thickness of the oversheet is as thin as 50 to 200 μm, so the skin layer is relatively thin. Therefore, even if a lubricant is mixed in the skin layer, This is not preferable because a mold stick problem that the oversheet sticks to the mold in the hot press process occurs. Also, if the core layer thickness ratio is less than 25%, the problem of mold stick does not occur in the card pressing process because the skin layer is thick, but the sheet is warped due to poor heat resistance, which is not preferable.

  In the present invention, as described above, at least one layer of the skin layer and the core layer needs to be made of an alloy resin of 80 to 20% by mass of PCT resin and 20 to 80% by mass of PC resin. When all of the skin layer and the core layer are composed of a resin other than the alloy resin, the remarkable effects of the present invention described in detail above cannot be obtained.

(Alloy resin)
As the PCT resin constituting the alloy resin of the present invention, a PCT resin having a glass transition temperature of 90 ° C. or higher, preferably 100 ° C. or higher is used. A non-crystalline aromatic polyester resin having a glass transition temperature of less than 90 ° C. is not preferable because of poor heat resistance.

  Furthermore, as this PCT resin, Eastman Tritan copolyester FX100 and Eastman Tritan copolyester FX200 (all are the Eastman Chemical company make) are mentioned as what can be obtained commercially.

  As the PC resin which is the other component constituting the alloy resin of the present invention, a transparent PC resin is preferably used. The PC resin to be used is not particularly limited, but those having a melt volume rate of 4 to 30 measured according to ISO 1133 can be suitably used. If the melt volume rate is less than 4, it is meaningful in that the toughness of the sheet is improved, but the molding processability is inferior. On the other hand, if the melt volume rate exceeds 30, it is not preferable because the toughness of the sheet is inferior.

  Furthermore, as this PC-type resin, for example, the trade name “Taflon FN2200A” (manufactured by Idemitsu Kosan Co., Ltd., glass transition temperature 152 ° C.) can be mentioned as commercially available.

  The composition ratio (mixing ratio) of the PCT resin and the PC resin in the alloy resin must be 20 to 80% by mass of the PC resin with respect to 80 to 20% by mass of the PCT resin. If the mixing ratio of the resin is less than 20% by mass, heat resistance and toughness are obtained, which is not preferable. Further, when a laser light energy absorber is added to this alloy-based resin to impart a laser coloring function, it is not preferable because the laser coloring property is inferior. Moreover, when the PCT resin is less than 20% by mass, the heat-fusibility at low temperature is inferior in the card heat lamination process. More preferably, it is 30-70 mass% of PC-type resin with respect to 70-30 mass% of PCT-type resin.

  The alloy resin is prepared by mixing 80 to 20% by weight of PCT resin and 20 to 80% by weight of PC resin uniformly with a mixer such as a mixer, and then heating and melting the mixture with a kneader. It can be manufactured by kneading below. There is no particular limitation on this production method.

  Moreover, in this invention, non-crystalline aromatic polyester-type resin can be mentioned as resin other than the above-mentioned alloy-type resin which comprises a skin layer. Moreover, as resin other than the above-mentioned alloy-type resin which comprises a core layer, a non-crystalline aromatic polyester-type resin, a polycarbonate-type resin, etc. can be illustrated.

  Furthermore, as the above-mentioned non-crystalline aromatic polyester resin, the glass transition temperature constituting the alloy resin of the present invention is 90 ° C. including various conventionally known non-crystalline aromatic polyester resins. The non-crystalline aromatic polyester-type resin mentioned above can be mentioned.

  As this non-crystalline aromatic polyester-based resin, for example, Eastar copolyester 6763, Eastman Tritan copolymer FX100, FX200 (all manufactured by Eastman Chemical Co., Ltd.) can be mentioned. Among these, Tritan has a glass transition temperature of 90 ° C. or higher, and thus has excellent heat resistance, toughness, and heat fusion in the card heating lamination process.

In the present invention, a resin other than the above-described alloy-based resin that constitutes the core layer and other than the above-described non-crystalline aromatic polyester-based resin can include a PC-based resin, which is transparent. PC resin is used. The PC resin used is not particularly limited, but those having a melt volume rate of 4 to ³⁰ cm ³ / min measured according to ISO 1133 as described above can be preferably used. If the melt volume rate is less than 4 cm ³ / min, it is meaningful in that the toughness of the sheet is improved, but the molding processability is inferior, so that it is difficult to use in practice, which is not preferable. Moreover, when the melt volume rate exceeds 30 cm ³ / min, the toughness of the sheet is inferior, which is not preferable.

(Laser light energy absorber)
In the present invention, the core layer is made of a PC-based resin, a non-crystalline aromatic polyester-based resin, or an alloy-based resin. It is suitable to contain ˜3 parts by mass, preferably 0.001 to 1 part by mass. Thus, by including a laser light energy absorber in the core layer, it is possible to form characters, images, and the like by laser marking in the core layer. The characters, images, and the like by this laser marking are drawn on the core sheet and the skin layers are laminated on both sides, so that they do not easily disappear even if they are rubbed. Therefore, a plastic IC card or the like including such a card sheet is excellent in security.

  Furthermore, if the blending amount of the laser light energy absorber exceeds 3 parts by mass, the transparency of the oversheet is lowered, and the amount of absorbed energy is excessively deteriorated, so that sufficient contrast cannot be obtained. On the other hand, if the addition amount of the laser beam energy absorber is less than 0.0001 parts by mass, sufficient contrast cannot be obtained, which is not preferable.

  As the laser light energy absorber, at least selected from the group of carbon black, carbon nanotube, graphite, metal oxide, composite metal oxide, metal sulfide, metal carbonate, metal silicate, and near infrared absorbing dye One type is mentioned.

  As the metal oxide, zinc, magnesium, aluminum, iron, titanium, silicon, antimony, tin, copper, manganese, cobalt, vanadium, niobium, molybdenum, ruthenium, tungsten, palladium, silver are used as the metal forming the oxide. And platinum. Examples of the composite metal oxide include composite metal oxides such as indium and tin (ITO) and indium and antimony (ATO).

  Furthermore, examples of the metal sulfide include zinc sulfide and cadmium sulfide, and examples of the metal carbonate include calcium carbonate. Examples of metal silicates include alumina silicate, iron-containing alumina silicate (mica), hydrous alumina silicate (kaolin), magnesium silicate (talc), calcium silicate, and magnesium silicate.

  Examples of the near-infrared absorbing dye include polymethine dyes, metal complex dyes, squalium dyes, cyanine dyes, indoaniline dyes, diimonium dyes, and the like.

  As these laser light energy absorbers, carbon black is preferably used. A mixture of carbon black and at least one selected from metal oxides, metal sulfides, metal carbonates and metal silicates having an average particle diameter of less than 200 nm is also preferably used.

  Also, when a mixture of carbon black and at least one selected from other metal oxides, metal sulfides, metal carbonates and metal silicates is used as a laser light energy absorber, these metal oxides, metals The average particle size of the sulfide, metal carbonate and metal silicate is at least less than 200 nm, preferably less than 100 nm, more preferably less than 50 nm. When the average particle diameter of these laser light energy absorbers exceeds 200 nm, the transparency of the oversheet is lowered, which is not preferable.

  The laser light energy absorber is blended only in the core layer constituting the three-layer sheet, or in the skin layer and the core layer. The addition amount (blending amount) of the energy absorber is 0.0001 to 3 parts by mass, preferably 0.001 to 1 part by mass with respect to 100 parts by mass of the core layer resin and / or skin layer resin. When the three-layer sheet is used as an oversheet, the energy absorber is preferably blended only in the core layer constituting the three-layer sheet. In the three-layer sheet, the core layer in which the energy absorber is blended is colored by laser light energy irradiation. The skin layer is a protective layer of the core layer coloring layer, for example, scratch resistance, abrasion resistance, chemical resistance. It is preferable as a protective function such as safety.

(White inorganic pigment)
Further, the skin layer is composed of a composition containing 5 parts by mass or more of a white inorganic pigment with respect to 100 parts by mass of each of an amorphous aromatic polyester resin (including a PCT resin) and an alloy resin. It is preferable.

  The basic structure of a general plastic card consists of (1) oversheet / (2) core sheet / (3) core sheet / (4) oversheet. Offset printing, inkjet printing, silk on one side of the core sheet After performing printing (color printing) such as screen printing, a transparent oversheet is laminated and a laminate is formed by a vacuum heating press. In this case, the core sheet is excellent in sharpness of printing (color printing) by exhibiting white. For this purpose, 5% by mass or more of a white inorganic pigment is blended with 100 parts by mass of the resin forming the skin layer. If the white inorganic pigment is less than 5% by mass, the printability is poor, which is not preferable, and the upper limit of the amount is preferably 30% by mass. If it exceeds 30% by mass, the toughness of the sheet is inferior, which is not preferable.

  Further, the white inorganic pigment is not particularly limited, and generally titanium oxide can be preferably used. The color tone can also be adjusted by blending titanium oxide with other organic pigments, dyes, fluorescent brightening agents, and the like.

(Matte processing)
It is preferable that mat processing is performed on both surfaces of the card sheet. The average surface roughness (Ra) by the mat processing is preferably 0.1 to 10 μm, and more preferably 0.5 to 5 μm. When the average surface roughness of the mat processing is less than 0.1 μm, when the card configuration is oversheet / coresheet / oversheet, air between each sheet is difficult to escape and air bubbles remain in the card. This is not preferable because blistering occurs, or gas burn occurs in the process of laser color development by irradiating laser light energy, resulting in defects such as card discoloration and laser mark printability. On the other hand, when the average surface roughness (Ra) of the mat processing exceeds 10 μm, the smoothness of the outermost layer of the card is inferior in the card lamination process, so that the surface gloss is inferior, and further, the sharpness of printed images and characters is inferior. Therefore, it is not preferable.

(Lubricant)
In the present invention, it is preferable to add a lubricant to the skin layer and the core layer. Examples of the lubricant used here include fatty acid esters, fatty acid amides, fatty acid metal salts, and the like, and one or more of these are blended. The addition amount of this lubricant is 0.01-3 mass parts with respect to 100 mass parts of resin which comprises a skin layer and a core layer, Preferably it is 0.05-1.5 mass parts. If it is less than 0.01 parts by mass, it will be fused to the press plate at the time of hot pressing, and if it exceeds 3 parts by mass, there will be a problem in the thermal fusion property of the card, which is not preferred.

  Examples of fatty acid ester-based lubricants include butyl stearate, cetyl palmitate, stearic acid monoglyceride, stearic acid diglyceride, stearic acid triglyceride, montan wax acid ester, wax ester, dicarboxylic acid ester, and complex ester. Examples of fatty acid amide-based lubricants include stearic acid amide and ethylene bisstearyl amide. Furthermore, examples of the fatty acid metal salt lubricant include calcium stearate, magnesium stearate, zinc stearate, aluminum stearate, barium stearate and the like.

(Antioxidant and / or anti-coloring agent)
Furthermore, in order to further stabilize the molecular weight and hue at the time of molding, a phenol-based antioxidant or a phosphite ester-based coloring inhibitor is used.

(Antioxidant)
Examples of phenolic antioxidants include, for example, α-tocopherol, butylhydroxytoluene, sinapir alcohol, vitamin E, n-octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate 3,5-di-tert-butyl-4-hydroxytoluene; pentaerythrityl-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], triethylene glycol-bis [3 -(3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 1,6-hexanediol-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 2-tert-butyl-6- (3′-tert-butyl-5′-methyl-2 '-Hydroxybenzyl) -4-methylphenyl acrylate, 2,6-di-tert-butyl-4- (N, N-dimethylaminomethyl) phenol, 3,5-di-tert-butyl-4-hydroxybenzylphosphonate Diethyl ester, 2,2′-methylenebis (4-methyl-6-tert-butylphenol), 2,2′-methylenebis (4-ethyl-6-tert-butylphenol), 4,4′-methylenebis (2,6- Di-tert-butylphenol), 2,2′-methylenebis (4-methyl-6-cyclohexylphenol), 2,2′-dimethylene-bis (6-α-methyl-benzyl-p-cresol), 2,2 ′ -Ethylidene-bis (4,6-di-tert-butylphenol), 2,2'-butylidene-bis (4-methyl-6- tert-butylphenol), 4,4′-butylidenebis (3-methyl-6-tert-butylphenol), triethylene glycol-N-bis-3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate 1,6-hexanediol bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], bis [2-tert-butyl-4-methyl 6- (3-tert-butyl) -5-methyl-2-hydroxybenzyl) phenyl] terephthalate, 3,9-bis {2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1,- Dimethylethyl} -2,4,8,10-tetraoxaspiro [5,5] undecane, 4,4′-thiobis (6- ert-butyl-m-cresol), 4,4′-thiobis (3-methyl-6-tert-butylphenol), 2,2′-thiobis (4-methyl-6-tert-butylphenol), bis (3,5 -Di-tert-butyl-4-hydroxybenzyl) sulfide, 4,4'-di-thiobis (2,6-di-tert-butylphenol), 4,4'-tri-thiobis (2,6-di-tert) -Butylphenol), 2,2-thiodiethylenebis- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 2,4-bis (n-octylthio) -6- (4- Hydroxy-3 ', 5'-di-tert-butylanilino) -1,3,5-triazine, N, N'-hexamethylenebis- (3,5-di-tert-butyl-4-hydride) Xyhydrocinnamide), N, N′-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyl] hydrazine, 1,1,3-tris (2-methyl-4-hydroxy) -5-tert-butylphenyl) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, tris (3,5-di -Tert-butyl-4-hydroxyphenyl) isocyanurate, tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris (3,5-di-tert-butyl) -4-hydroxybenzyl) isocyanurate, 1,3,5-tris (4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanur 1,3,5-tris [2- {3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy} ethyl] isocyanurate and tetrakis [3- (3,5- And di-tert-butyl-4-hydroxyphenyl) propionyloxymethyl] methane.

  Among the above-mentioned phenolic antioxidants, n-octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethyl-2,4,6-tris ( 3,5-di-tert-butyl-4-hydroxybenzyl) benzene, 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, tetrakis [3- (3 5-di-tert-butyl-4-hydroxyphenyl) propionyloxymethyl] methane is preferred, especially n-octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate. is there. The said hindered phenolic antioxidant can be used individually or in combination of 2 or more types.

(Anti-coloring agent)
Examples of the coloring preventing agent include phosphite ester coloring preventing agents. Examples of the phosphite-based anti-coloring agent include triphenyl phosphite, tris (nonylphenyl) phosphite, tridecyl phosphite, trioctyl phosphite, trioctadecyl phosphite, didecyl monophenyl phosphite, dioctyl mono Phenyl phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, 2,2-methylenebis (4,6-di-tert-butylphenyl) octyl phosphite, tris (Diethylphenyl) phosphite, tris (di-iso-propylphenyl) phosphite, tris (di-n-butylphenyl) phosphite, tris (2,4-di-tert-butylphenol) Phosphite, tris (2,6-di-tert-butylphenyl) phosphite, distearyl pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis ( 2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-ethylphenyl) pentaerythritol diphosphite, phenylbisphenol A pentaerythritol diphosphite Examples thereof include phosphite, bis (nonylphenyl) pentaerythritol diphosphite, and dicyclohexyl pentaerythritol diphosphite.

  Further, as other phosphite compounds, those having a cyclic structure by reacting with dihydric phenols can be used. For example, 2,2′-methylenebis (4,6-di-tert-butylphenyl) (2,4-di-tert-butylphenyl) phosphite, 2,2′-methylenebis (4,6-di-tert- Butylphenyl) (2-tert-butyl-4-methylphenyl) phosphite, 2,2′-methylenebis (4-methyl-6-tert-butylphenyl) (2-tert-butyl-4-methylphenyl) phosphite 2,2′-ethylidenebis (4-methyl-6-tert-butylphenyl) (2-tert-butyl-4-methylphenyl) phosphite.

  Among the phosphite compounds, tris (2,4-di-tert-butylphenyl) phosphite is particularly preferable. The phosphite ester coloration inhibitor may be used alone or in combination of two or more. Moreover, you may use together with a phenolic antioxidant.

  Furthermore, an ultraviolet absorber, a light stabilizer, other additives, etc. can also be mix | blended as needed in the range which does not impair the objective of this invention.

(UV absorber)
Examples of the ultraviolet absorber that suppresses the light deterioration resistance of the card by adding (compounding) the ultraviolet absorber and / or the light stabilizer include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-amylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-bis (α, α′-dimethylbenzyl) phenylbenzotriazole, 2,2′methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol], methyl-3- [3-tert-butyl-5- (2H-benzotriazol-2-yl) -4-hydroxyphenylpropionate-benzotriazole compounds represented by condensates with polyethylene glycol That.

  Moreover, as an ultraviolet absorber other than the above, for example, 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-hexyloxyphenol, 2- (4,6-bis ( And hydroxyphenyltriazine compounds such as 2,4-dimethylphenyl) -1,3,5-triazin-2-yl) -5-hexyloxyphenol. Further, examples of the ultraviolet absorber include 2,2′-p-phenylenebis (3,1-benzoxazin-4-one) and 2,2′-m-phenylenebis (3,1-benzoxazin-4-one). And cyclic imino ester compounds such as 2,2′-p, p′-diphenylenebis (3,1-benzoxazin-4-one).

(Light stabilizer)
Examples of the light stabilizer include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, tetrakis (2, 2,6,6-tetramethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate, tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) -1,2, 3,4-butanetetracarboxylate, poly {[6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl] [(2,2,6 , 6-tetramethylpiperidyl) imino] hexamethylene [(2,2,6,6-tetramethylpiperidyl) imino]}, polymethylpropyl 3-oxy- [4- (2,2,6,6-tetramethyl ) Piperidi It can also include those of hindered amine typified by Le] siloxane. Such a light stabilizer exhibits better performance in terms of weather resistance and the like when used in combination with the ultraviolet absorber and optionally various antioxidants.

(Other additives)
In the present invention, additives such as a colorant, a filler and a flame retardant may be added (blended) to each layer of the sheet as necessary, or different types of polymers may be blended to improve physical properties.

[2] Card sheet forming method:
In the present invention, in order to obtain a three-layer card sheet, for example, a co-extrusion method in which the resin composition of each layer is co-extruded and laminated, a method in which each layer is formed into a film, and the two layers are laminated. There is a method of laminating a film formed separately by extrusion and a film formed separately thereto, but it is preferable to laminate by coextrusion from the viewpoint of productivity and cost. Specifically, the resin composition of each layer is blended, or pelletized as necessary, and charged into each hopper of a three-layer T-die extruder in which T-dies are covalently connected. It can be melted at a temperature of 200 ° C. to 280 ° C., co-extruded with a three-layer T die, and cooled and solidified with a cooling roll or the like to form a three-layer laminate. The card sheet of the present invention is not limited to the above method, and can be formed by a known method. For example, the card sheet can be obtained according to the description on pages 6 to 7 of JP-A-10-71763. be able to.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited thereto. In the following examples and comparative examples, “parts” and “%” mean “parts by mass” and “% by mass” unless otherwise specified. Various evaluations and measurements in the examples were performed by the following methods.

[1] Multilayer sheet for card (laminated structure consisting of oversheet / core sheet / core sheet / oversheet) Releasability after lamination heat press molding:
The sheets laminated so as to have the configurations of Examples 1 to 3 and Comparative Examples 1 to 3 were sandwiched between two chrome-plated steel plates (molds), and the press temperature was 160 ° C. and the pressure was 3.923 MPa (40 Kgf / cm ² ). Held for 10 minutes (heated and pressurized). Then, after cooling to room temperature, the sample pinched | interposed with the chromium plating steel plate was taken out with the chromium plating steel plate. The releasability from the mold when the chrome-plated steel sheet was peeled from the sample taken out was evaluated.
○: It can be easily peeled off from the mold and has good releasability.
Δ: Slightly adheres to the mold and can be peeled off, but the oversheet surface is scratched and cannot be used, and there is a problem in releasability.
X: It adheres to a metal mold | die and cannot obtain the target laminated body (plastic card).

[2] Air bubble releasing property and heat sealing property:
a) Bubble removal property: The state of remaining bubbles in the laminate after hot press molding was observed as described above to evaluate the bubble removal property.
○: There are no bubbles in the laminate, which is extremely excellent.
X: Bubbles remain in the laminated body and defects occur.
b) Thermal fusion property: The adhesion was observed by lightly inserting a cutter blade between the sheets constituting the laminate after hot press molding as described above.
○: No peeling and good heat-fusibility.
X: Peeling occurs partially or over the entire surface, and there is a problem in heat-fusibility.

[3] Card laminate surface gloss:
As described above, the gloss state of the surface of the card laminate after hot press molding was visually observed and evaluated according to the following criteria.
○: Good gloss and excellent visibility.
Δ: Slightly inferior in gloss and good visibility.
X: Insufficient gloss (inferior), inferior in visibility.

[4] Laser printability:
As described above, the laser mark property was evaluated by the following method using the Nd · YVO ₄ laser (LT-100SA manufactured by Laser Technology Co., Ltd. and RSM103D manufactured by Roffincinal Co., Ltd.) on the surface of the card laminate after the hot press molding. The laser mark property was determined by marking at a laser irradiation rate of 400 mm / sec and determining whether there was an abnormality such as good contrast or surface layer destruction.
○: Contrast ratio of 3 or more, surface layer destruction, no resin burn, and excellent laser printability.
Δ: Contrast ratio of less than 2 to 3, surface layer destruction, no resin burn, good laser printability.
X: Contrast ratio of less than 2 and / or surface layer destruction, resin burning, inferior laser printability.

[5] Transparency of oversheet:
The total light transmittance of the oversheet was measured with a Macbeth spectrophotometer EYE7000, and evaluated according to the following criteria.
○: Total light transmittance of 80% or more and excellent transparency.
Δ: Total light transmittance of 60% or more and less than 80%, and transparency is good.
X: The total light transmittance is less than 60%, and the transparency is poor.

[6] Heat resistance of oversheet:
Using a gravure coater, the maximum temperature (limit temperature) at which vertical wrinkles do not enter the oversheet was determined and evaluated according to the following criteria.
○: The limit temperature is 110 ° C. or more, and the heat resistance is excellent.
(Triangle | delta): Limit temperature 90-110 degrees C and heat resistance are favorable.
X: It is inferior to limit temperature 90 degrees C or less and heat resistance.

(Production Example 1) Oversheet A:
Non-crystalline aromatic polyester resin (trade name “Eastman Tritan copolyester FX200” manufactured by Eastman Chemical Co., Ltd., glass transition temperature = 119 ° C.) (abbreviated as PCT) as the skin layer, and non-crystalline aromatic polyester as the core layer system resin (trade name "Eastman Tritan copolyester FX200" manufactured by Eastman Chemical Company, glass transition temperature = 119 ℃) and polycarbonate (trade name "TARFLON FN2200A" Idemitsu Kosan Co., Ltd., melt volume rate ⁼ 12cm 3 / 10min.) A polymer alloy (abbreviated as PC) (blend ratio = PCT / PC = 30/70), and fatty acid monoglyceride (Riquemar S-100, manufactured by Riken Vitamin Co., Ltd.) as a lubricant on 100 parts of skin layer PCT 0.2 part, 100 parts of core layer alloy resin, 0.2 part of fatty acid monoglyceride (Rikemar S-100, RIKEN vitamin) as a lubricant, hindered phenol antioxidant (Irganox 1010, BASF) as an antioxidant (Made) 0.2 part was mix | blended. Further, 0.001 part of carbon black was blended with 100 parts of the core layer alloy resin as an energy absorber that absorbs laser light energy. A three-layer transparent oversheet for card of skin layer / core layer / skin layer was obtained by T-die coextrusion method. The total thickness of the sheet is 100 μm, and the thicknesses of the skin layers on the front and back sides are the same, and the layer structure is skin layer (12.5 μm) / core layer (75 μm) / skin layer (12.5 μm) Thus, the thickness ratio of the core layer was set to 75%. Further, a three-layer oversheet A was obtained on which double-sided mat processing was performed so that the average surface roughness (Ra) was 1 to 3 μm.

(Production Example 2) Oversheet B:
Non-crystalline aromatic polyester resin (trade name “Eastman Tritan copolyester FX200” manufactured by Eastman Chemical Co., Ltd., glass transition temperature = 119 ° C.) (abbreviated as PCT) and polycarbonate (trade name “Taflon FN2200A” Idemitsu Kosan Co., Ltd.) Ltd., using a melt volume rate ⁼ 12cm 3 abbreviated as /10Min.)(PC) polymer alloy (blend ratio = PCT / PC = 70/30 ), and, to 100 parts of the skin layer alloy resin, As a lubricant, 0.2 part of a fatty acid monoglyceride (Riquemar S-100, manufactured by Riken Vitamin Co., Ltd.) and 0.2 part of a hindered phenol-based antioxidant (Irganox 1010, manufactured by BASF Corp.) as an antioxidant were blended. Using PC as the core layer, 100 parts of the core layer PC with 0.2 part of fatty acid monoglyceride (Riquemar S-100, manufactured by Riken Vitamin Co., Ltd.) as the lubricant, hindered phenol antioxidant (Irganox as the antioxidant) 1010, manufactured by BASF) 0.2 parts. Furthermore, 0.001 part of carbon black was blended with 100 parts of the core layer PC as an energy absorber that absorbs laser light energy. A three-layer transparent oversheet for card of skin layer / core layer / skin layer was obtained by T-die coextrusion method. The total thickness of the sheet is 100 μm, and the thicknesses of the skin layers on the front and back sides are the same, and the layer structure is skin layer (12.5 μm) / core layer (75 μm) / skin layer (12.5 μm) Thus, the thickness ratio of the core layer was set to 75%. Furthermore, a three-layer oversheet B was obtained on which double-sided mat processing was performed so that the average surface roughness (Ra) was 1 to 3 μm.

(Production Example 3) Oversheet C:
Non-crystalline aromatic polyester resin (trade name “Eastman Tritan copolyester FX100” manufactured by Eastman Chemical Co., Ltd., glass transition temperature = 110 ° C.) (abbreviated as PCT) as the skin layer, and non-crystalline aromatic polyester as the core layer Resin (trade name “Eastman Tritan copolyester FX200” manufactured by Eastman Chemical Co., Ltd., glass transition temperature = 119 ° C.) (abbreviated as PCT) and polycarbonate (trade name “Taflon FN2200A” manufactured by Idemitsu Kosan Co., Ltd., melt volume rate = 12cm ³ using /10min.)(PC and abbreviated) of the polymer alloy (blend ratio = PCT / PC = 30/70 ), and a fatty acid as a lubricant in the skin layer PCT100 parts monoglyceride (RIKEMAL S-100 Riken Vitamin Co., Ltd. (0.2 parts), core layer alloy resin (100 parts), fatty acid monoglyceride (Riquemar S-100, Riken Vitamin) (0.2 parts) as a lubricant, antioxidants as hindered phenolic antioxidants (Irga) Nox 1010 (manufactured by BASF) 0.2 parts. Further, 0.001 part of carbon black was blended with 100 parts of the core layer alloy resin as an energy absorber that absorbs laser light energy. A three-layer transparent oversheet for card of skin layer / core layer / skin layer was obtained by T-die coextrusion method. The total thickness of the sheet is 100 μm, and the thicknesses of the skin layers on the front and back sides are the same, and the layer structure is skin layer (12.5 μm) / core layer (75 μm) / skin layer (12.5 μm) Thus, the thickness ratio of the core layer was set to 75%. Furthermore, a three-layer oversheet C was obtained on which double-sided mat processing was performed so that the average surface roughness (Ra) was 1 to 3 μm.

(Production Example 4) Oversheet P:
Non-crystalline aromatic polyester resin (trade name “Eastman Tritan copolyester FX200” manufactured by Eastman Chemical Co., glass transition temperature = 119 ° C.) (abbreviated as PCT) as the skin layer, and non-crystalline aromatic polyester as the core layer Resin (trade name “Eastman Tritan copolyester FX200” manufactured by Eastman Chemical Co., Ltd., glass transition temperature = 119 ° C.) (abbreviated as PCT) and polycarbonate (trade name “Taflon FN2200A” manufactured by Idemitsu Kosan Co., Ltd., melt volume rate = 12cm ³ using /10min.)(PC and abbreviated) of the polymer alloy (blend ratio = PCT / PC = 90/10 ), and a fatty acid as a lubricant in the skin layer PCT100 parts monoglyceride (RIKEMAL S-100 Riken Vitamin Co., Ltd. (0.2 parts), core layer alloy resin (100 parts), fatty acid monoglyceride (Liquemar S-100, Riken Vitamin Co., Ltd.) (0.2 parts) as a lubricant, antioxidant as a hindered phenolic antioxidant (Irganox 1010, manufactured by BASF) 0.2 part was blended. Further, 0.001 part of carbon black was blended with 100 parts of the core layer polymer alloy as an energy absorber that absorbs laser light energy. A three-layer transparent oversheet for card of skin layer / core layer / skin layer was obtained by T-die coextrusion method. The total thickness of the sheet is 100 μm, and the thicknesses of the skin layers on the front and back sides are the same, and the layer structure is skin layer (12.5 μm) / core layer (75 μm) / skin layer (12.5 μm) Thus, the thickness ratio of the core layer was set to 75%. Furthermore, a three-layer oversheet P on which double-sided mat processing was performed so that the average surface roughness (Ra) was 1 to 3 μm was obtained.

(Production Example 5) Oversheet Q:
Non-crystalline aromatic polyester resin (trade name “Eastman Tritan copolyester FX200” manufactured by Eastman Chemical Co., Ltd., glass transition temperature = 119 ° C.) (abbreviated as PCT) and polycarbonate (trade name “Taflon FN2200A” Idemitsu Kosan Co., Ltd.) Ltd., using a melt volume rate ⁼ 12cm 3 abbreviated as /10Min.)(PC) polymer alloy (blend ratio = PCT / PC = 10/90 ), and, as a lubricant to 100 parts of the skin layer polymer alloy Fatty acid monoglyceride (Riquemar S-100, manufactured by Riken Vitamin Co., Ltd.) 0.2 part, and as an antioxidant, 0.2 part of a hindered phenolic antioxidant (Irganox 1010, manufactured by BASF Co.) was blended. Using PC as the core layer, 100 parts of the core layer PC with 0.2 parts of fatty acid monoglyceride (Riquemar S-100, manufactured by Riken Vitamin Co., Ltd.) as the lubricant, hindered phenol antioxidant (Irganox 1010 as the antioxidant) 0.2 parts of BASF). Furthermore, carbon black 0.001 part was mix | blended with 100 parts of said core layer PC as an energy absorber which absorbs laser beam energy. A three-layer transparent oversheet for card of skin layer / core layer / skin layer was obtained by T-die coextrusion method. The total thickness of the sheet is 100 μm, and the thicknesses of the skin layers on the front and back sides are the same, and the layer structure is skin layer (12.5 μm) / core layer (75 μm) / skin layer (12.5 μm) Thus, the thickness ratio of the core layer was set to 75%. Further, a three-layer oversheet Q having a double-sided matte process so that the average surface roughness (Ra) is 1 to 3 μm was obtained.

(Production Example 6) Oversheet R:
Non-crystalline aromatic polyester resin (trade name “Eastar Copolyester 6763” manufactured by Eastman Chemical Co., Ltd., glass transition temperature = 80 ° C.) (abbreviated as PETG) as the skin layer, and non-crystalline aromatic polyester as the core layer Resin (trade name “Eastar Copolyester 6763” manufactured by Eastman Chemical Co., Ltd., glass transition temperature = 80 ° C.) (abbreviated as PETG) and polycarbonate (trade name “Taflon FN2200A” manufactured by Idemitsu Kosan Co., Ltd., melt volume rate = 12cm ³ using /10min.)(PC and abbreviated) of the polymer alloy (blend ratio = PETG / PC = 30/70 ), and a fatty acid as a lubricant in the skin layer PETG100 parts monoglyceride (RIKEMAL S-100, Riken Vitamin Co. 0.2 parts, core layer alloy tree Lubricants as fatty acid monoglyceride to 100 parts (RIKEMAL S-100, manufactured by Riken Vitamin) 0.2 parts of the antioxidant, hindered phenol antioxidant (IRGANOX 1010, BASF Corp.) was blended 0.2 parts. Further, 0.001 part of carbon black was blended with 100 parts of the core layer alloy resin as an energy absorber that absorbs laser light energy. A three-layer transparent oversheet for card of skin layer / core layer / skin layer was obtained by T-die coextrusion method. The total thickness of the sheet is 100 μm, and the thicknesses of the skin layers on the front and back sides are the same, and the layer structure is skin layer (12.5 μm) / core layer (75 μm) / skin layer (12.5 μm) Thus, the thickness ratio of the core layer was set to 75%. Further, a three-layer oversheet R having a double-sided matte process was obtained so that the average surface roughness (Ra) was 1 to 3 μm.

(Production Example 7) Core sheet E:
Non-crystalline aromatic polyester resin (trade name “Eastar Copolyester 6763” manufactured by Eastman Chemical Co., Ltd., glass transition temperature = 80 ° C.) (abbreviated as PETG) as the skin layer, and non-crystalline aromatic polyester as the core layer Resin (trade name “Eastman Tritan copolyester FX200” manufactured by Eastman Chemical Co., Ltd., glass transition temperature = 119 ° C.) (abbreviated as PCT) and polycarbonate (trade name “Taflon FN2200A”, manufactured by Idemitsu Kosan Co., Ltd., melt volume rate = 12cm ³ using /10min.)(PC and abbreviated) of the polymer alloy (blend ratio = PCT / PC = 30/70 ), and a fatty acid as a lubricant in the skin layer PETG100 parts monoglyceride (RIKEMAL S-100, Riken Vitamin Co. 0) 2 parts, 100 parts of core layer alloy resin, 0.2 parts of fatty acid monoglyceride (Riquemar S-100, manufactured by Riken Vitamin Co., Ltd.) as a lubricant, hindered phenol antioxidant (Irganox 1010, BASF Corporation) as an antioxidant (Made) 0.2 part was mix | blended. Furthermore, 20 parts of titanium oxide was blended with 100 parts of the core layer polymer alloy. A white core sheet for card of 3 layers of skin layer / core layer / skin layer was obtained by T-die coextrusion method. The total thickness of the sheet is 200 μm, and the thicknesses of the skin layers on the front and back sides are the same, and the layer structure is configured as skin layer (25 μm) / core layer (150 μm) / skin layer (25 μm). The thickness ratio of the core layer was 75%. Further, a three-layer core sheet E on which double-sided mat processing was performed so that the average surface roughness (Ra) was 1 to 3 μm was obtained.

  The oversheets A to C and P to R obtained in the above Production Examples 1 to 6 and the core sheet E obtained in the Production Example 7 are configured in Examples 1 to 3 and Comparative Example 1 according to the configuration shown in Table 1. Various evaluations were performed as ˜3. The results are shown in Table 1.

(Discussion)
As shown in Table 1, each of Examples 1 to 3 is excellent in transparency and heat resistance of the oversheet, and further excellent in mold release from the mold in the heating and laminating process, and in air release properties. It was excellent in heat-fusibility between layers, surface gloss and laser printability. On the other hand, in Comparative Example 1, since the core layer polymer alloy of the oversheet P uses H-PETG / PC = 90/10, the laser printability (coloring property) is poor and the heat resistance is also inferior. Met.

  Further, in Comparative Example 2, since the skin layer polymer alloy of the oversheet Q uses PCT / PC = 10/90, there is a problem in interlayer heat fusion property at a normal heating press temperature (160 ° C.) in the card lamination process. In addition, the gloss was insufficient (inferior) and the visibility was poor. Furthermore, since Comparative Example 3 used PETG as the skin layer of the oversheet R and PETG / PC = 30/70 as the core layer, it was inferior in laser color development and heat resistance of the sheet.

  The card sheet of the present invention is a non-PVC card sheet, and when used for a card oversheet, it has excellent laser marking properties, heat resistance and transparency, and is for non-contact and contact cards. It can be suitably used as an oversheet. In addition, when used in a core sheet for cards, it has excellent whiteness, printability and heat resistance, and even in card lamination and heat pressing processes, sheet transportability, lamination, and deformation of the sheet due to heating are also “warped”. Excellent heat resistance.

Claims (3)

A card sheet formed from a sheet of at least three layers having a core layer between skin layers and laminated by a coextrusion method,
At least one of the skin layer or the core layer of the three-layer sheet is a polymer of 80 to 20% by mass of an amorphous aromatic polyester resin having a glass transition temperature of 90 ° C. or more and 20 to 80% by mass of a polycarbonate resin. Heat resistance comprising an alloy, wherein the total thickness of the three-layer sheet is 50 to 400 μm, and the ratio of the thickness of the core layer to the total thickness of the three-layer sheet is 25% or more and less than 85% And card sheet with excellent heat-fusibility.   The core layer is composed of a polycarbonate resin or a polymer alloy of 80 to 20% by mass of a non-crystalline aromatic polyester resin having a glass transition temperature of 90 ° C. or more and 20 to 80% by mass of a polycarbonate resin, and the resin or polymer The card | curd sheet | seat of Claim 1 which contains 0.0001-3 mass parts of laser beam energy absorbers with respect to 100 mass parts of alloys.   The skin layer, which is both outermost layers of the three-layer sheet, is an amorphous aromatic polyester resin having a glass transition temperature of 90 ° C. or higher, or an amorphous aromatic polyester resin 80 to 80 ° C. having a glass transition temperature of 90 ° C. or higher. It is comprised from the composition which contains a white inorganic pigment 5 mass parts or more with respect to each 100 mass parts of the polymer alloy which consists of 20 mass% and polycarbonate-type resin 20-80 mass%, At least one side of the said 3 layer sheet | seat is The card sheet according to claim 1, wherein mat processing with an average roughness (Ra) of 0.1 to 10 μm is performed.