JPS5845747B2 - Information exchange card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information exchange card, such as a commuter pass for automatic ticket gates, a credit card, or a deposit payment card, which uses a magnetic medium and does not have a thermocompression seal.

Conventional cards of this kind that have an electrostatic recording layer and a magnetic recording layer have a support made of wood fiber paper or synthetic fiber paper, and a water-soluble low resistance layer and solvent permeation prevention layer containing a low resistance agent such as a conductive polymer on one side of the support. An electrostatic recording sheet is prepared by applying an electrostatic recording surface layer thereon, and the recording sheet is sandwiched between a film having a magnetic recording layer on the back side and a transparent film using an adhesive, and heated. Cards were put into practical use that were crimped and stamped to the required size.

However, with a card having such a structure, (1) air bubbles enter the card during the thermocompression sealing process, and for example, when used as a commuter pass, the card tends to peel off when used repeatedly in an automatic ticket gate, resulting in a lack of durability.

■ Since thermo-compression sealing and punching processes are essential, automatic ticket vending machines and other recording devices become large, complicated to operate, and prone to breakdowns.

■ Surplus plastic material generated during the punching process is difficult to dispose of as waste.

■ The card has a complicated layer structure and has too many layers, making it expensive, and the large number of man-hours required leads to many manufacturing problems, such as yield loss.

It had the following drawbacks.

The present invention aims to improve these drawbacks, and provides a card in which an electrostatic recording layer is provided on one side of a support made of a plastic material via a low resistance layer, and a magnetic recording layer is provided on the other side. The present invention provides an information exchange card characterized in that the low resistance layer is mainly composed of iodized steel, an organic solvent-soluble binder resin, and a crosslinking agent.

When providing a low-resistance layer necessary for electrostatic recording on a plastic material, it is difficult to apply a layer in which a conductive polymer is dispersed in a water-soluble binder as in the past due to manufacturing difficulties such as repelling. However, even if the surface of the plastic material is processed to make it more convenient for coating, or a surfactant is added to the coating solution, the water resistance between the layers will be poor unless heat-pressure sealing is applied. Furthermore, delamination is likely to occur when used repeatedly in automatic ticket gates.

Furthermore, the electrical conductivity is not preferable since it is not only easily affected by the outside air humidity which is characteristic of ionic conduction, but also has the drawback that the electrical resistance is 3 to 4 orders of magnitude higher than when silver iodide is used.

Another method is to provide a low-resistance layer in which carbon is dispersed in an organic solvent-soluble binder, or to provide a metal vapor deposition layer, but the black or gray coloration cannot be completely hidden by coating the electrostatic recording surface layer, and the static Electrically recorded images tend to become unclear.

Furthermore, titanium oxide, zinc oxide, lead oxide, copper bromide, etc., which are known as white conductive metal compounds, all have the conductivity required for electrostatic recording when the support is a high-resistance plastic material. cannot be applied to this type of application.

In the present invention, silver iodide is used as a low-resistance agent necessary for electrostatic recording, and a low-resistance layer in which silver iodide is dispersed in a binder is provided between the plastic support and the electrostatic recording layer, so a thermocompression seal is required. The purpose of the present invention is to obtain a card that maintains sufficient electrostatic recording properties, water resistance, and peeling resistance without causing any damage, and is sufficiently practical for repeated use, for example, as a commuter pass for automatic ticket gates.

As a binder for dispersing silver iodide, polyurethane resin,
Organic solvent-soluble resins such as polyester resins, acrylic resins, polyvinyl chloride resins, epoxy resins, and polystyrene resins are used alone or in combination, or emulsions of these resins are used in combination with crosslinking agents such as melamine resins and polyamide resins. It may also be used as a binder.

Among these, polyurethane resins and polyester resins have particularly excellent effects in terms of binding to the support and water resistance.

The plastic material used as the support includes polyester, polyvinyl chloride, cellulose triacetate, polycarbonate, cellophane, etc. Among these, polyester is particularly preferred in terms of heat resistance and strength.

In this case, it is more preferable to apply a surface treatment such as matte processing, embossing, electrical discharge machining, etc. and an undercoat layer using urethane resin or the like on the support in order to improve the binding property with the low resistance layer. .

Further, by providing these surface treatments and an undercoat layer, background pattern printing, foam printing, etc. can be performed more effectively.

The electrostatic recording layer directly creates an electrostatic latent image by applying a high electric field, and is used as a recording layer mainly made of insulating resin such as acrylic, styrene, or epoxy, which can be developed and fixed with toner, or used in electrofax method electrophotography. The photosensitive layer may be mainly composed of a photoconductor such as zinc oxide.

The magnetic recording layer is made by dispersing γ-iron oxide in a binder such as vinyl chloride-vinyl acetate copolymer resin.

In this case, γ-iron oxide is buried in plastic material, or
Alternatively, the object of the present invention can be achieved by kneading plastic materials into a magnetic film in a melt-molding process and forming an electrostatic recording layer thereon via a low resistance layer containing silver iodide.

Since the present invention has the above structure, it has sufficient water resistance without causing delamination, even if it is rubbed with wet hands, immersed in water for a long time, or inadvertently agitated with clothes in a washing machine. Moreover, there is no occurrence of delamination due to bending or the like.

In other words, even though it does not have a thermocompression seal, it maintains water resistance and peel resistance comparable to conventional sealed cards, and can be used for a wide range of purposes as a card with a simple and inexpensive layer structure. .

The present invention will be described in detail below with reference to Examples and Comparative Examples.

Example 1 70 parts by weight of γ-iron oxide and 30 parts by weight of vinyl chloride-vinyl acetate copolymer were coated on one side of a 75μ thick transparent polyester film.
A coating solution obtained by dispersing parts by weight in ethyl acetate was applied and dried to form a 15 μm magnetic recording layer.

Next, on the other side of the support, 30 parts by weight of silver iodide, 25 parts by weight of polyurethane resin, and 45 parts by weight of isocyanate resin (curing agent) were added.
A coating liquid consisting of 110 parts by weight of ethyl acetate was applied and dried to a dry coating amount of 15 g/m to provide a low resistance layer.

A coating solution obtained by dispersing 10 parts by weight of titanium oxide and 100 parts by weight of butyral resin in ethyl acetate was applied onto the low resistance layer and dried to form an electrostatic recording layer with a coating thickness of 7 μm.
)It was created.

Example 2 Example 1 was applied to one side of a 75μ thick transparent polyester sheet.
A low resistance layer similar to the above is formed, and zinc oxide 1 is added on the low resistance layer.
60 parts by weight of silicone resin, 0.1 part by weight of rose bengal, and 100 parts by weight of toluene was coated and dried to form an electrostatic recording layer. On the other hand, a magnetic recording layer was formed on the back side of the polyester sheet in the same manner as in Example 1 to prepare a card (Sample 2).

Example 3 A coating liquid (solid content concentration: 20 strips) consisting of 30 parts by weight of iodized steel, 70 parts by weight of vinyl acetate emulsion, and 30 parts by weight of melamine-formalin resin was applied to one side of a transparent polyester film with a thickness of 125 μm as a low-resistance layer. Dry coating amount: 1597m
A magnetic recording layer and an electrostatic recording layer were formed in the same manner as in Example 1 to prepare a card (Sample 4).

When the cards of Samples 1 to 3 above were immersed in standing water at 20° C. for 3 weeks, sufficient water resistance was confirmed without causing any delamination.

In addition, when a severe water resistance test was performed by stirring for 1 hour using a reversible washing machine, no peeling occurred at all.

Furthermore, in order to examine the peeling resistance properties during drying, transparent adhesive tape (cellotape) was attached to the electrostatic recording surface of each card to a width of 10 x length of 3 crfL, and the 180° peeling force was measured at a peeling speed of 100 mm and 1 sec. Sufficient peel resistance was confirmed with no occurrence of peeling.

Next, each card is placed in a commuter pass printing and issuing machine (manufactured by Toshiba Corporation), and a pulse voltage of 1700 V is applied to the surface of the electrostatic recording layer of the card to form an electrostatic latent image, which is developed and fixed, and at the same time magnetic recording is performed. When we created a commuter pass for automatic ticket gates, we obtained a clear electrostatically recorded image and there was no curling.

When this commuter pass was repeatedly passed through an automatic ticket gate (manufactured by Toshiba Corporation) 1,300 times, there was no peeling of the recording layer or image, and there was no problem at all in practical use.

Comparative Example: 70 parts by weight of r-iron oxide and 30 parts by weight of vinyl chloride-vinyl acetate copolymer were placed on one side of a 70μ thick transparent polyester film.
A coating liquid obtained by dispersing parts by weight in ethyl acetate was applied and dried to form a 15 μm magnetic recording layer.

Next, conductive polymer (ECR3) is applied to the opposite side of the film.
4) A coating liquid prepared with a solid content of 10 parts by weight and 10 parts by weight of a vinyl acetate emulsion was applied in a coating amount of 3 parts by weight.
It was coated and dried to a concentration of ~4 g/rrl, and the electrostatic recording layer used in Example 1 was placed thereon to prepare a card.

When this card was immersed in still water, the surface layer peeled off after 2 hours.

Furthermore, when this card was placed in a commuter pass printing and issuing machine (manufactured by Toshiba Corporation) in a low humidity atmosphere (20% RH) and electrostatic recording was performed in the same manner as in Example 1, an unclear image quality with significant scumming was obtained. .

Claims (1)

[Claims] 1. A card comprising a support made of a plastic material, an electrostatic recording layer provided on one side via a low resistance layer, and a magnetic recording layer provided on the other side, wherein the low resistance layer is an iodine. An information exchange card that is mainly composed of chemical steel, organic solvent-soluble binder resin, and crosslinking agent. 2. The information exchange card according to claim 1, wherein the binder resin constituting the low resistance layer is a polyurethane resin, and the crosslinking agent is incyanate.