JPS5845998A - Heat-sensitive recording type magnetic sheet - Google Patents

Abstract

PURPOSE:To eliminate the developing, fixing and printing steps and to enable to print only by heating by providing a heat sensitive layer which reversibly changes to transparent and opaque states on the other surface of a support having a magnetic recording layer on one surface. CONSTITUTION:A magnetic recording layer which contains ferromagnetic material as main ingredient is formed on one surface of a support, and a heat sensitive layer which is composed of a composition capable of reversibly changing between the transparent state and opaque state optically by the change of the temperature conditions is formed on the other surface of the support. The composition preferably contains 1:3-1:16 of organic substance A to matrix material B by weight ratio (A/B). The substace A to be applied include alcohol, halogen alcohol, alkaline amine. The matrix material B includes silicone resin, polyamide, polymethacrylate.

Description

[Detailed Description of the Invention] The present invention relates to a heat-sensitive recording sheet and a ticket using the same.
Regarding heat-sensitive magnetic cards such as commuter passes and meal tickets.

In recent years, the number of travelers and workers who use passenger tickets, commuter passes, etc. has increased significantly in passenger transportation, especially with the development of urban transportation such as national railways, private railways, and subways in the Tokyo metropolitan area and Osaka area. , so-called liaison transportation is increasing.

For these reasons, automatic vending of cards such as train tickets and commuter passes has reached the stage of practical use.

Also, admission tickets for amusement parks, movie theaters, exhibition halls, etc., department stores, etc.
Automatic sales of tickets and cards, such as food tickets for cafeterias at exhibition halls, etc., is also being considered, and in some cases this has reached the stage of ★ in the northern part of the state.

Printing and recording methods for these tickets and cards include electrophotography, electrostatic recording, diazo copying that utilizes a chemical reaction between two components, and chelate method (Japanese Patent Publication No. 44-16137).
(No. 2) or general printing methods are adopted.

Therefore, when these printing and recording methods are adopted, the printing mechanism of the automatic ticket vending machine is complicated and large, and the machine itself is large because two processes of development and fixing are required, or a printing process is required. However, there are drawbacks such as having to reduce the cost of the machine and raising the cost of the machine. Also, depending on the printing method, semi-dry ink may adhere to hands and stain clothes.

Moreover, since high-quality paper or medium-quality paper is used to support cards such as tickets, they are prone to folding and wrinkles when they get wet. It also has the disadvantage of stopping the operation.

Although the current situation has many unresolved problems,
There were increasing expectations for increased efficiency of personnel due to labor savings, automatic creation of these cards, and improved efficiency.

In view of the current situation, the inventors of the present invention have previously conducted various studies on Sicardian Q recording materials, but this time,
By applying a composition that can reversibly change between an optically transparent state and an opaque state depending on the temperature to a thermal recording method, the development and fixing steps are not required, and the printing step can also be omitted. Furthermore, since printing is performed simply by applying heat, the printing mechanism of the recording device can be simplified, which allows the device to be made smaller and the cost of the device to be significantly reduced, leading to the completion of the present invention. . That is, according to the present invention, a magnetic recording layer containing a ferromagnetic material as a main component is provided on one side of a support, and the other side of the support changes between an optically transparent state and an opaque state by changing the temperature. A heat-sensitive recording type magnetic sheet is provided, characterized in that it includes five heat-sensitive layers made of a composition that can reversibly change between states.

The accompanying drawings are diagrams for explaining the light transmission characteristics of the composition applied to the present invention. Temperature of the composition from a to clz
As the temperature is increased, what was opaque at temperature a becomes transparent as the light transmittance increases rapidly when it reaches temperature t. As the temperature rises further and reaches C, the transmittance decreases rapidly to 1
The composition becomes opaque and then remains unchanged upon increasing to d.

Next, when it is cooled from temperature d to temperature a, it becomes opaque! !
When the temperature a is reached, the transmittance returns to its original value. However, even if a composition in a transparent state whose temperature is between b % 't by heating is cooled and the temperature is returned to a, the transparent state is maintained.

The present invention thus provides a heating layer containing a composition that reversibly changes between a transparent state and an opaque state as the temperature changes, on a support having a magnetic recording layer on one side. If the support is a transparent film, the color of the magnetic recording layer itself can be changed by making the heat-sensitive layer transparent by heating printing (at a temperature of about 50 to 30 degrees Fahrenheit). If only the printed portion can be seen through, and the support is opaque, the color of the support itself can be seen through. The image on a magnetic sheet printed in this way will not be erased even if it is left as it is, but it can be erased by heating it to a temperature above C, and the sheet after erasing can be printed again. be able to.

The composition mentioned above is Special Publication No. 119377 of 1972.
The one shown in the publication is preferably applied. That is,
Specifically, organic substance A and matrix material shown below,
Material B has a weight pressure (A/B) ratio of 1:3 to 1:16.

range, range of composition.

Organic substance A: Alcohol, alkanediol, halogen alcohol or halogen alkanediol, alkane amine, alkene, alkane, alkyne, halogen alkane, halogen alkene, or halogen alkyne, unsaturated monomer or bicarbonate or ester, or Amides, saturated or unsaturated aliphatic acids or esters or amides, thioalcohols, thiocarboxylic acids or esters or amides thereof, carboxylic acid-esters of thioalcohols, or mixtures of both.

Matrix material B: silicone resin, polyester, polyamide, polystyrene, polyacrylic, polycitacrylate, etc. Among polyesters, linear saturated polyvarnishes and chills of high molecular weight are particularly suitable, and among them, polyesters with a molecular weight of 20,000 to 20,000 are particularly suitable. Similarly, a suitable matrix material is a polyvinyl chloride-acrylonitrile copolymer, which is essentially unbranched and unsaturated.

In the present invention, it is desirable that the above-mentioned clearing temperature range 6- (b to C in Figure 1) be within the range of 70 to 100°C, and for this purpose, behenic acid or arachidic acid is used as the organic substance A. As the matrix material B, it is preferable to use higher fatty acids such as vinylidene chloride-acrylonitrile copolymer and other vinyl polymers or copolymers.

In the present invention, it is preferred to select a matrix material that has strong adhesion to the support in order to more firmly hold the heat-sensitive layer on the support. In order to improve the matching property of the heat-sensitive layer to the thermal head, AI! 20B+SiO2t
Inorganic materials with high transparency, such as ZnosS102tsiot, can be included in the heat-sensitive layer. The thickness of the heat-sensitive layer is usually 10 to 15μ.
Although there are no particular limitations on the support used in the present invention, it is desirable to use one with good surface smoothness. As mentioned above, when a transparent plastic film is used as a support, an image is formed depending on the color of the magnetic recording layer itself. For this purpose, various coloring pigments may be incorporated into the magnetic recording layer.

Of course, the present invention is not limited to this, and images can be formed by changing the color of the support itself or by providing a colored layer on the support.

In the present invention, various conventionally used ferromagnetic materials can be used as the ferromagnetic material used to form the magnetic recording layer. Generally, γ-ferric oxide or the like is employed in the form of fine powder. In addition, binders for bonding this ferromagnetic material to the support include acrylic resin, epoxy resin, phenol resin, vinyl acetate, vinyl chloride-vinyl acetate copolymer, polybutadiene resin, polyester resin, polyacrylamide, and polystyrene. Adhesive synthetic resins such as resin, melamine resin, vinyl chloride resin, and polyurethane resin are applicable.

The present invention will now be explained in detail by way of examples.

Example A magnetic paint was prepared by adding mixture B having the following component composition to dispersion A having the following acid component composition and stirring.

[Dispersion A]

7-pe203 magnetic powder (black) 3
00 f oleic acid
3f carbon black
9f cyclohexano/
10 (1 methyl isobutyl ketone
400 t [Mixture B] Cyclohexanone 20
? Methyl isobutyl ketone 8 (
1. Using a wire parr, cut the obtained magnetic paint to a thickness of 100 mm.
It was coated and dried on one surface of a polyethylene terephthalate transparent film having a thickness of 8 μm when dried. Next, a heat-sensitive layer forming solution having the following component composition was prepared.

Behenic acid 1 Tetrahydrofuran 7 This solution was applied to the back surface of the previously prepared magnetic material coated film using a wire bar so that the dry thickness was 15 μm, and then dried. The heat-sensitive layer thus formed was opaque at room temperature, so the magnetic recording layer could not be seen through. Regarding the heat-sensitive recording magnetic sheet obtained by itc as described above,
Head pressure of 50017 for a printer using a thin film head
When printing was performed at m2, current application time of 3 ms, and voltage SV (heating temperature of 80°C), the printed area became transparent, the magnetic recording layer was exposed, and a clear black image was obtained. After printing, the sheet was heated under 5000 lux illumination and temperature 30°C.
I left it for a week, but the image never disappeared.

On the other hand, when the printed sheet was left at a temperature of 100° C. for 1 second, the printed portion became opaque and returned to the state before printing. Next, when printing was performed on this sheet in the same manner as the previous time, a clear black image was obtained. Although such printing and decoloring were repeated a total of 100 times, no change was observed in the recording performance of the sheet.

[Brief explanation of the drawing]

The drawing is a graph explaining the light transmission characteristics of the composition applied to the present invention, where the vertical axis shows transmittance and the horizontal axis shows temperature. Patent applicant Ricoh Co., Ltd. agent Patent attorney Toshiaki Ikeura

Claims (2)

[Claims] (1) A magnetic recording layer mainly composed of ferromagnetic material is provided on one side of the support, and the other side of the support can be changed between an optically transparent state and an opaque state by changing temperature conditions. 1. A heat-sensitive recording magnetic sheet comprising a heat-sensitive layer made of a reversibly changeable composition. (2) The heat-sensitive recording magnet according to claim 1, wherein the support is a transparent film, and the magnetic recording layer is visible through the transparent portion of the support and the heat-sensitive layer by thermal recording. sheet.