JP3357713B2 - Film for IC card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film for an IC card, and more particularly, to an antistatic and heat-resistant film useful for manufacturing components constituting the card, such as a panel, a printed circuit board, a spacer, an intermediate protective plate, and a frame. The present invention relates to a film for an IC card comprising a polyester film having high performance.

[0002]

2. Description of the Related Art IC cards are roughly classified into IC memory cards and microcomputer cards.
Due to its high-speed operation, low power consumption, small size and light weight, and strong resistance to vibration and shock, it has been widely used as an external storage device for portable devices such as electronic notebooks, electronic still cameras, notebook computers, and electronic dictionaries. .

[0003] Hard vinyl chloride resin, metal, polyimide resin, epoxy resin, and the like are used as materials for components constituting an IC card. For polymer materials, antistatic properties, heat resistance, bending resistance, and the like are used. The situation is not always satisfactory in terms of solvent resistance, rigidity, cost and the like. In addition, metals have disadvantages in weight, insulation, corrosion resistance, and the like. For example, in order to ensure the quality of an IC card during high-temperature storage, heat resistance of the frame and the like is important, but hard vinyl chloride resin is susceptible to heat and solvents and has low adhesiveness when the card is constructed.

Further, it is necessary to pay attention to static electricity in an IC card. For example, when a large voltage due to static electricity enters an IC, it may be destroyed. However, conventional plastic cards have insufficient performance.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an IC
Parts that make up the card, such as panels, printed circuit boards,
Useful for manufacturing spacers, intermediate protective plates, frames, etc.
An object of the present invention is to provide an IC card film excellent in antistatic property, heat resistance, bending resistance, solvent resistance and adhesiveness.

[0006]

The present invention has the following configuration in order to achieve the above object.

[0007] A film comprising a polyester comprising an aromatic dicarboxylic acid in which at least 50 mol% of the dicarboxylic acid component is a main component is a film having at least one surface provided with a layer containing an electron conductive type conductive agent. Specific resistance is 10 ⁴
A film for an IC card having a resistance of 10 to ^{12 12} Ω / □.

In the present invention, the polyester is a linear saturated polyester in which at least 50 mol% of the dicarboxylic acid component is composed of an aromatic dicarboxylic acid.

Examples of the aromatic dicarboxylic acid include terephthalic acid, 2,6-naphthalenedicarboxylic acid, isophthalic acid, 4,4'-diphenyldicarboxylic acid, and phenylindanedicarboxylic acid. When the proportion of the aromatic dicarboxylic acid component is less than 50 mol%, the film has insufficient heat resistance. Other dicarboxylic acids include, for example, adipic acid, 1,4-cyclohexanedicarboxylic acid,
Sebacic acid or the like can be used.

As the dihydroxy compound component constituting the polyester, for example, ethylene glycol, 1,1,
4-butanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, xylylene glycol, dimethylolpropionic acid, glycerin, trimethylolpropane, poly (ethylene oxide) glycol , Poly (tetramethylene oxide) glycol, an alkylene oxide adduct of bisphenol A, and the like. Of these, ethylene glycol is preferred.

The polyester can be produced by a conventionally known method, and the number average molecular weight is preferably from 8,000 to 28,000. The secondary transition point of the polyester is preferably from 60 to 200 ° C. (measured by the DSC method). If this secondary transition point is lower than 60 ° C., heat resistance is deteriorated, while if it exceeds 200 ° C., processing properties are deteriorated, which is not preferable.

If necessary, other resins, flame retardants, lubricants, fillers, coloring agents, ultraviolet absorbers, antioxidants, and the like can be added to the polyester. As the lubricant, conventionally known fine particles inert to polyester, for example, inorganic fine particles such as silicon dioxide, calcium carbonate, and clay, silicone resin particles, and organic fine particles such as cross-linked polystyrene can be used. . Further, as the coloring agent, for example, titanium oxide, barium sulfate, or the like can be used.

In the present invention, the film containing polyester as a main component may be any of an unstretched film, a uniaxially stretched film and a biaxially stretched film. These medium biaxially stretched films are preferred. The thickness of the film may be selected depending on the components of the card, and is generally preferably 50 to 500 μm. In some cases, two or more films may be laminated to a thickness of 500 μm to 3 mm. As the mechanical properties of the film, it is preferable that the tensile elastic modulus in at least one direction is 600 to 1300 kg / mm ² .

In the present invention, examples of a method for imparting antistatic properties to one or both surfaces of the film include a method of laminating a layer containing an electron conductive type conductive agent on the surface of the film. Examples of this method include a coating method, a co-extrusion method, and an extrusion lamination method. Further, as a coating method, in the polyester film forming step, the film after longitudinal stretching is roll-coated with a polymer aqueous liquid containing an antistatic agent or a conductive agent, followed by drying, transverse stretching, and heat fixing. The method is preferably mentioned.

As the electron conductive type conductive agent, for example, carbon black, tin oxide, NB type compound, titanium salt / amine type ionic compound and the like are preferable.

Other antistatic agents and conductive agents include alkyl sulfonates, alkyl aryl sulfonates, ethosulfate, betaine compounds, quaternary ammonium salts, acrylic polymers containing quaternary ammonium salts, sodium polystyrene sulfonate , Metal complex compounds, tin oxide, carbon black, polypyrrole, polyaniline, phosphate,
Polyvinyl sulfonate, metal fine powder, NB compound,
A titanium salt / amine ionic compound or the like can be used.

In the present invention, the film must have a surface resistivity of 10 ⁴ to 10 ¹² Ω / □. When the surface specific resistance is less than 10 ⁴ Ω / □, the conductivity is too strong and the insulation is insufficient. On the other hand, when the surface specific resistance is more than 10 ¹² Ω / □, the antistatic property is insufficient and the electrostatic trouble cannot be suppressed. Absent. Since this film has the above-described antistatic property, troubles due to static electricity can be suppressed, and thus the frame, spacer, and printed circuit board can be easily formed.

The polyester film of the present invention comprises:
The film has the characteristics of high strength, antistatic properties, and excellent heat resistance, and has the advantage that the crystal-oriented film has even higher solvent resistance. Also, the adhesiveness is excellent, and the components of the IC card can be easily formed. For example, a printed circuit board can be formed by printing a circuit on the surface of a polyester film (including a sheet) and further incorporating elements (chips) such as a microprocessor and a memory in the film or pasting it on the film surface. In addition, polyester film is used as a decorative panel as a front panel, as a spacer cut into a desired mold, as a frame into a desired mold,
Further, it can be used as an intermediate protective plate. The element may be a DRAM, an SRAM, a mask RO according to the application.
M, flash memory, one-time PROM, EEPROM
Various things such as OM can be used. For example, a flash memory may be used for an IC card for voice recording.

The IC card can have various configurations, and is manufactured by joining and integrating the components, that is, the memory element, the printed circuit board (module), the spacer, the intermediate protection plate, the frame, the exterior panel, and the like.

For example, a polyester printed board on which a memory element is mounted is formed, and a polyester sheet spacer, a polyester film intermediate protective plate, a polyester sheet frame, and a polyester panel are arranged on both outer sides and joined to complete. The panel is provided with various designs such as printing. The IC card thus obtained is useful as an electronic organizer, a notebook computer, a distribution card, a security card, a voice recording / reproducing device, and various cards such as a distribution card. Particularly useful for voice recording.

[0021]

The present invention will be described in more detail with reference to the following examples. Each characteristic value in the examples was evaluated by the following methods. (1) Heat resistance Observe changes in the external shape when the card or its component structure is kept at 80 to 90 ° C. for 1 hour. (2) Surface specific resistance After leaving the film at 23 ° C. × 50% RH for 24 hours, the film is measured with a vibration capacitance type potentiometer TR-84M (manufactured by Takeda Riken), and the value is displayed. (3) Static resistance From a capacitance of 100 pF to a resistance of 150
The presence or absence of the influence when the static electricity of 0 V acts on the contact is evaluated.

[0022]

Example 1 An unstretched sheet was prepared from polyethylene-2,6-naphthalenedicarboxylate having an intrinsic viscosity [η] of 0.61 and containing 11% by weight of titanium oxide having an average particle diameter of 0.2 μm, After stretching 3.2 times, aqueous polyurethane (polyethylene glycol, ethylene glycol, diphenylmethane diisocyanate, ethylenediamine, ammonium dimethylol ammonium propionate-based polyurethane having an average molecular weight of 2500) liquid containing carbon black (42% by weight) on both sides of the film (48) % By weight) of a coating agent composed of polyoxyethylene nonylphenyl ether (10% by weight), dried, and then 3.6
The film was double-stretched and heat-treated at 225 ° C. to obtain a film (film E) having a surface resistivity of 3.2 × 10 ⁷ Ω / □ and a thickness of 270 μm.

The two films E are laminated to a thickness of 545.
A sheet having a thickness of μm (sheet F) was produced.

A module was formed by arranging flash memory elements based on the film E, and spacers formed from the sheet F were overlapped and joined. One film E was stacked and joined on the upper and lower sides, and a frame made of the sheet F was further joined. A film E was bonded to the front and back sides of the outside to produce a flash memory IC card. The characteristics are shown in Table 1.

[0025]

Example 2 Table 1 shows the characteristics of the film obtained in the same manner as in Example 1 except that the coating materials shown in Table 1 were changed.

[0026]

[Table 1]

[0027]

According to the present invention, antistatic properties and heat resistance, which are useful for manufacturing components constituting an IC card such as a panel, a printed board, a spacer, an intermediate protective plate, and a frame.
An IC card film having excellent bending resistance, solvent resistance and adhesiveness can be provided.

────────────────────────────────────────────────── ─── Continued on front page (51) Int.Cl. ⁷ Identification code FI C08L 67/02 C08L 67/02 G06K 19/00 H05K 1/03 610M H05K 1/03 610 G06K 19/00 Z (56) References JP-A-4-83692 (JP, A) JP-A-62-240549 (JP, A) JP-A-63-13746 (JP, A) JP-A-1-130994 (JP, A) JP-A-3-112690 (JP, A) JP-A-5-138781 (JP, A) JP-A-5-169604 (JP, A) JP-A-5-131602 (JP, A) (58) Fields investigated (Int. Cl. ⁷⁾ B42D 15/10 521 B32B 27/36 C08J 5/18 CFD G06K 19/00

Claims (3)

(57) [Claims] 1. A film containing an electron conductive type conductive agent on at least one side of a film mainly composed of a polyester comprising at least 50 mol% of an aromatic dicarboxylic acid in a dicarboxylic acid component.
A film having a surface specific resistance of 10
Film for IC card with ⁴ to 10 ¹² Ω / □. 2. The film for an IC card according to claim 1, wherein the polyester contains titanium oxide. 3. The film for an IC card according to claim 1, wherein the electron conductive type conductive agent is carbon black.