JPS6348629A - Recording material for card - Google Patents

Abstract

PURPOSE:To form a recording material for a card which is highly resistant to scratching, wear, chemicals, etc., and permits printing with high reliability by forming a resin layer contg. a foaming agent on a colored base material. CONSTITUTION:The resin layer 3 contg. the foaming agent 2 is formed on the colored base material 1. The foaming agent 2 to be used is a microcapsule- like foaming body including an expanding agent which gasifies when heated into a resin spherical body which can be softened and expanded when heated. Said agent is formed by including isobutane as the expanding agent into the resinous shell consisting of a copolymer of vinylidene chloride and acrylonitrile and forming the same to the microcapsule state. The foaming agent is foamed and decolored only in the part applied with the heat when the resin layer 3 contg. the foaming agent 2 is subjected to thermosensitive recording. The printed matter is thus obtd.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a recording material for cards used when printing characters such as names displayed on various cards such as optical cards and IC cards. It is.

[2 Ming (already required)] The present invention creates a high-contrast, low-scratch, and abrasion-resistant product without deforming the card by forming a resin layer containing a foaming agent on a colored base material. The object of the present invention is to provide a recording material for cards that can be printed with excellent chemical resistance and page properties.

[Conventional technology]

Currently, cash cards and membership cards.

Demand for various cards including credit cards, ID cards, etc. is increasing tremendously.

The most common method for recording information on these various cards is the magnetic recording method, in which a magnetic recording medium is pasted onto the card and information is magnetized and recorded on it. An optical recording method that records information on a medium such as Te by forming pits by laser irradiation;
A method of embedding a C chip in a card and recording information on the IC has been proposed.

By the way, for example, a card with information recorded using a magnetic recording method, such as a cash card, has a bank code number, a branch number, and an account number on the front of the card.

Card number 1 name, etc. are formed as floating letters by embossing, and the surface of the embossed letters is colored with a thermal transfer ribbon to make them easier to recognize.

The above-mentioned embossed character processing is performed as the final process of card processing using a processing machine such as an emboss encoder, but the formation of the above-mentioned embossed characters on the card is
Since the raised characters are formed by pressing the type from the back of the card using extremely high pressure, the card becomes deformed after embossing.

For example, cards using an optical recording method require very high accuracy in recording and reading because they use lasers. If embossed characters are processed and formed as described above on a card using such an optical recording method, the accuracy cannot be maintained due to deformation of the card, leading to unreadableness or misreading, which poses a major problem. .

Other methods for forming characters on the card surface include heat-sensitive coloring, photo-thermal, sublimation transfer, etc., but these do not particularly affect the reading of the information recorded on the card. However, there are problems such as poor durability such as scratch resistance, abrasion resistance, and weather resistance, and processed characters may disappear.

[Problem that the invention seeks to solve]

In this way, especially for cards using the optical recording method, when embossed characters are applied to the card surface,
This may cause deformation of the card, causing errors in reading the recorded information or causing problems such as the card becoming unreadable.

In addition, other character processing methods have problems in terms of durability.

Therefore, the present invention addresses the above-mentioned conventional situation! High contrast without deforming the umami card.

It is an object of the present invention to provide a recording material for cards that can perform printing with high printing speed and excellent scratch resistance, abrasion resistance, weather resistance, chemical resistance, etc.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention is characterized in that a resin layer containing a foaming agent is formed on a colored base material.

The foaming agent used here is a microcapsule foam containing an expanding agent that gasifies when heated in resin spheres that can be softened and expanded by heating, and is made of a copolymer of vinylidene chloride and acrylonitrile. Isobutane is encapsulated as an expanding agent in a resinous shell, and it is encapsulated into microcapsules.

The above foaming agent has a diameter that is about 4 times that of microcapsules, about 300 mm, because the resin shell that forms the microcapsules softens when the temperature rises, and the isobutane encapsulated becomes gaseous isobutane and expands as the temperature rises. It becomes a pure white, perfectly round ball about the size of a mesh.

When performing printing using the property of a foaming agent that easily expands as the temperature rises, for example, a thermal head or the like is used to transmit the information to be recorded to the drive circuit section in the same way as in normal use. If the heating resistor is made to generate heat by selectively sending signals by the drive circuit, printing can be easily performed.

In addition, the amount of the blowing agent used is 30 parts by weight when the resin mixed with the microencapsulated blowing agent is 100 parts by weight.
It is preferable to set it as 50 parts by weight. If the amount is less than 30 parts by weight, the printing density will decrease because the amount of foaming agent is small, and if it is more than 50 parts by weight, the foaming agent layer will be too thick and the thermal conductivity will be low, the foaming agent in the lower layer will not foam, and the printing density will decrease as well. This decreases and makes it difficult to recognize characters.

The recording material for cards of the present invention can be used not only for printing identification characters on cards but also as a recording layer for recording information signals. If such a recording material is used, there is no risk of information being lost due to the influence of magnetism, as in the magnetic recording method, and there is no need for a complicated recording device and high precision, as in the optical recording method.

[Effect]

When thermal recording is performed on a resin layer containing a foaming agent, the foaming agent foams only in the areas where heat is applied, resulting in a change in color and a printed matter.

In addition, the foaming agent has excellent impact resistance because it becomes a substantially perfect spherical shape when it is foamed, and because it develops a pure white color, the base material is colored, resulting in high-contrast, easy-to-read printing.

〔Example〕

Examples of the present invention will be described in detail below, but it goes without saying that the present invention is not limited to these examples.

Exercising ■Soil The composition of the resin layer containing the blowing agent used in this example is shown.

The saturated copolymerized polyester resin is a 25% toluene/methyl ethyl ketone solution.

A foaming agent was dispersed and mixed in the solution of the saturated copolymerized polyester resin to obtain a resin i8 liquid.

Next, as shown in Figure 1, the above resin solution was applied onto a black or navy blue polyethylene terephthalate film (1) used as a card base material to form a foaming agent (14 μm thick layer).
A resin layer (3) containing 2) was formed.

Subsequently, a hard coat agent is applied on the resin layer (3) and heated at 100 (1 to 1300 vAJ/c) using a high-pressure mercury lamp.
The hard coating agent was cured by irradiating ultraviolet rays with an energy of 5 μm to form a coating layer (4) having a layer thickness of 5 μm.

The above hard coating agent is a mixture of epoxy acrylate and urethane acrylate mixed in a specified solvent, and has properties such as weather resistance and heat resistance (for example, to the extent that it can withstand the amount of heat generated by the heating resistor of a thermal head). It is fine as long as you have it.

Using the card base material (1) on which the resin layer (3) and protective layer (4) were formed in this manner, a printing test was conducted as shown in FIG. 2. The printing test was performed using a thermal head (24-dot thermal head manufactured by Alps Electric Co., Ltd.).
A power of 8 W was applied to the heating resistor and printing was performed from above the protective pju to obtain a white printed matter.

The composition of the resin layer containing the foaming agent used in Example 2 is as follows.

The saturated copolymerized polyester resin contains 25% toluene/methyl ethyl ketone.

A foaming agent and a fluorescent brightener are dispersed in the solution of the saturated copolymerized polyester resin to form a resin solution. A resin layer containing a foaming agent having a layer thickness of 14 μm was obtained by coating on a black or dark blue polyethylene terephthalate film used as a base material.

Subsequently, a hard coat agent was applied onto the resin layer, and the hard coat agent was cured by irradiating ultraviolet rays with an energy of 1000 to 1300 mJ/am2 using a high-pressure mercury lamp to obtain a protective layer with a layer thickness of 5 μm.

A printing test was conducted in the same manner as in Example 1 using the card base material on which the resin layer and protective layer were formed in this manner.

The printed matter thus obtained had a whiter color that was more emphasized than in Example 1.

A foaming agent layer containing a foaming agent that foams when exposed to heat is applied onto the card base layer, and a thermal head applies heat from above to print, thereby producing a clear white printed matter.

In addition, since the printing method is the same as that of a normal thermal head, no external force or other force is applied to the card base material, and there is no deformation of the card base material. Therefore, the information recorded on the card by various methods is It can be read without any problem.

〔Effect of the invention〕

As is clear from the above description, the recording material for cards according to the present invention consists of a foaming agent layer and a protective layer, and can be easily foamed by applying heat to the foaming agent contained in the resin layer. Since the agent foams, recording printing and its equipment can be simplified.

In addition, even after foaming, the foaming agent is protected by a resin layer, making it scratch resistant, abrasion resistant, and weather resistant.

It has excellent IT quality and improves the reliability of printing.

Furthermore, the foaming agent becomes a substantially perfect spherical shape by foaming, resulting in printing with excellent impact resistance.

Furthermore, when the foaming agent foams, its color becomes pure white.
The base material is colored, resulting in high-contrast, easy-to-read printing.

The printing method is the same as the printing method of a normal thermal head (because there is no external force or other force applied to the card base material and there is no deformation of the card base material, information recorded on the card by various methods). Juryu can be read without any problem.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of the main part schematically showing an example of the groove bottom of the card recording material 4 to which the present invention is applied, and FIG. be. 1...Card base material 2...Blowing agent 3...Resin layer Patent applicant Sony Chemical Co., Ltd. agent Patent attorney Mimi Koike Art supplies Sakae

Claims (1)

[Claims] A recording material for a card, characterized in that a resin layer containing a foaming agent is formed on a colored base material.