JPH045342Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a counterfeit-proof plastic card used as a various certification card such as a credit card or a bank card.

BACKGROUND OF THE INVENTION In order to prevent counterfeiting of this type of certification card, it is desirable to provide a means for determining potential authenticity of the card. Conventional methods for such identification include, for example, adding a watermark to the card itself, inserting a password into a part of the card using a special material that can be detected by infrared rays, or embedding a magnetic material that can be detected magnetically. Various methods have been proposed. However, when using these methods, not only is the production of the card complicated and costly, but also the cost of the detection device is high in the case of infrared detection or magnetic detection. The reality is that this method has hardly been put into practice because the detection operation is complicated.

On the other hand, as a simple means of preventing counterfeiting, ink containing a fluorescent substance has been applied to the card surface to hide hidden patterns and characters that are hidden under visible light and cannot be seen under ultraviolet rays. It is also used as a printing layer (for example, in 1983)
-159154, Utility Model No. 56-563, etc.).

Problems that the invention aims to solve However, those who attempt to counterfeit cards usually try to detect in advance whether or not there are anti-counterfeiting measures installed on genuine cards. In recent years, the use of fluorescent substances to form hidden patterns has been widely applied not only to identification cards but also to various other products. It is quite possible to detect the presence or absence of counterfeit prevention means and their specific aspects.

However, in the case of cards such as conventional products that have anti-counterfeiting measures such as the above-mentioned hidden patterns applied to the surface of the card, it is easy to detect this, and therefore, it is easily detected by a counterfeiter. It cannot be denied that the possibility is high. Therefore, although it is primarily important for counterfeit prevention means to prevent detection of the counterfeit prevention means, the above-mentioned conventional products cannot necessarily be said to be preferable.
In addition, it is important that anti-counterfeiting measures are difficult to imitate even if the counterfeit prevention measures are discovered secondarily, but it is important that counterfeit prevention measures are difficult to imitate even if the counterfeit prevention measures are discovered. As long as the printing layer is formed using ink or the like, it is not impossible for a person attempting to counterfeit it to be counterfeited using a relatively simple printing method, but rather it is relatively easy. obtain. For this reason, the conventional products have not necessarily been able to highly avoid the possibility of being counterfeited.

In view of the above-mentioned background, this idea was developed to firstly make it difficult to detect the presence or absence of anti-counterfeiting measures, and secondly to make it difficult to counterfeit even if they are detected. The third object is to make the card easy to manufacture by card manufacturers who have limited predetermined equipment, to be able to mass-produce it well, and to provide it at low cost.

Means for Solving the Problems For the above purpose, this invention provides a card comprising an opaque synthetic resin core layer and a transparent synthetic resin coating layer coated on at least one side of the core layer. An anti-counterfeiting plastic card characterized in that the resin core layer is formed by a fluorescent transparent resin layer mixed with a fluorescent whitening agent and colored opaque resin layers laminated and integrated on both sides of the transparent transparent resin layer. This is the summary.

Embodiments This invention will be described below with reference to illustrated embodiments.

The plastic card according to this invention includes one synthetic resin core layer 1 formed substantially opaque;
On at least one side thereof, a transparent synthetic resin coating layer 5 is integrally laminated over the entire surface in such a manner as to cover a printed layer 4 of characters or the like for information transmission.

The core layer 1 is composed of three layers: a fluorescent transparent resin layer 2 mixed with a fluorescent whitening agent, and colored opaque resin layers 3, which are laminated and integrated on both sides with this in the middle. Only when ultraviolet rays are irradiated from the circumferential end face of the card, the fluorescent transparent resin layer 2 in the core layer 1 can be visibly excited to emit blue-violet fluorescence at the end face. .

The fluorescent transparent resin layer 2 of the core layer 1 is formed into a sheet by mixing a fluorescent whitening agent into a transparent resin such as polyvinyl chloride resin or polycarbonate resin. The fluorescent whitening agents used for this purpose are additives that eliminate the yellow tinge of plastic products and give them transparency and brightness. A composition having the following composition is used, and is mixed in an amount of at least 0.05 parts by weight per 100 parts by weight of the resin. In this case, if the amount of the fluorescent whitening agent mixed is less than 0.05 part by weight, blue-violet fluorescence is less likely to occur significantly under irradiation with ultraviolet rays. On the other hand, the colored opaque resin layer 3 is made of polyvinyl chloride resin, acrylonitrile-butadiene-styrene resin, polycarbonate resin, or the like and is used in the form of a film or a thin sheet. This opaque resin layer 3 is usually formed in white, but may have yellow or other colors.
Of course, it is desirable that the printed layer 4, such as letters, has a bright color so that it can be easily seen.

Furthermore, the transparent synthetic resin coating layer 5 may of course be formed on both sides of the core layer 1, and a film-like material such as polyvinyl chloride resin or polycarbonate resin is used here as well.

The means for laminating and integrating the fluorescent transparent resin layer 2 constituting the core layer 1, the colored opaque resin layers 3, 3 on both sides of the core layer 1, and the core layer 2 and the transparent synthetic resin coating layer 5 is to connect each layer with an adhesive. Although they may be bonded together, they are generally closely bonded to each other by means of heat fusion.

1 The cards of the above embodiments are mainly used for various identification purposes, and under visible light such as daylight, the colored opaque resin layers 3, 3 of the core layer 1 are visible on both the front and back sides. Depending on the color, it is observed as white, for example. Moreover, even when irradiated with ultraviolet rays, infrared rays, etc., the appearance of both the front and back surfaces does not show any particular change. However, when the peripheral edge of the card is irradiated with ultraviolet rays, the fluorescent transparent resin layer 2 within the core layer 1 emits blue-purple light, making it difficult to determine whether the card is genuine when observed from the edge. is possible.

Effects of the invention As explained in the operation of the above-mentioned embodiment, this invention is a means for determining authenticity of cards to prevent counterfeiting, since even if the front or back surface of the card is irradiated with ultraviolet rays, the appearance does not change at all. It is difficult to see through the fact that it is given. That is, the anti-counterfeiting device has excellent performance in detecting the presence or absence of the anti-counterfeiting means. On the other hand, those who know the structure of the card can determine the authenticity of the card by irradiating the peripheral end face with ultraviolet rays and emitting the excited light from the fluorescent transparent resin layer that appears in a thin line within the core layer. It is extremely easy to do.

Further, even if the presence of the fluorescent transparent resin layer is detected by a person attempting to counterfeit the card, it is difficult to counterfeit the card according to the present invention. That is, since the anti-counterfeit card of the present invention has a fluorescent transparent resin layer in a laminated state within the core layer that constitutes the main body of the card, it cannot be used with similar fluorescent brightener-containing synthetic resins. In addition to the difficulty in obtaining sheet-like products from the market, the work of laminating and integrating colored opaque resin layers is extremely difficult unless special lamination bonding equipment is available, and counterfeiting by unauthorized persons is extremely difficult. Therefore, even higher safety can be ensured.

On the other hand, card manufacturers who have the necessary equipment can create a core layer that becomes the card body by continuously laminating a colored opaque synthetic resin film or sheet on a fluorescent transparent synthetic resin sheet containing a fluorescent agent. Because it can be manufactured, it is easy to manufacture, has excellent mass productivity, and can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of this invention. 1... Opaque synthetic resin core layer, 2... Fluorescent transparent resin layer, 3... Colored opaque resin layer, 5... Transparent synthetic resin coating layer.

Claims (1)

[Claims for Utility Model Registration] A card comprising an opaque synthetic resin core layer and a transparent synthetic resin coating layer coated on at least one side of the core layer, wherein the opaque synthetic resin core layer is fluorescent whitened. An anti-counterfeiting plastic card characterized by being formed of a fluorescent transparent resin layer mixed with an agent and colored opaque resin layers laminated and integrated on both sides of the fluorescent transparent resin layer.