JPH05162465A - Visible recording medium - Google Patents

Abstract

PURPOSE:To make a picture formed on a recording layer easy to see in a recording medium having a visible recording layer constituted of synthetic resin material which causes the reversible change of a transparent state and an opaque state. CONSTITUTION:In a recording medium having a visible recording layer 5 via a metallic reflection layer 3 on the surface of base material of the recording medium, an air layer 8 is provided between the metallic reflection layer and the visible recording layer 5. The visible recording layer 5 is constituted of synthetic resin material which causes the reversible change of a transparent state and an opaque state. The air layer 8 is formed by providing an adhesive layer in the peripheral part of the interval of the metallic reflection layer 3 and the visible recording layer 5. The picture is clear and made easy to see by providing the air layer.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a commuter pass, an entrance permit,
The present invention relates to a recording medium such as various prepaid cards that is repeatedly used and has a recording layer that can repeatedly form and erase a visible image.

[0002]

2. Description of the Related Art A commuter pass for a transportation facility, an admission permit for an event hall or a building, etc. is used repeatedly every day, but there is no means for checking unauthorized boarding and unauthorized entrance due to management.

Magnetic cards and the like are also used in various prepaid cards, but since the recorded contents cannot be directly visually inspected, the payment amount and balance cannot be easily checked, and there is a problem in terms of guaranteeing the contents to the user. It was

Therefore, conventionally, there has been proposed a method of visually recording on a recording medium and erasing it. For example, it has been proposed to use a material (JP-A-55-154198) in which an organic low molecular weight substance is dispersed in a synthetic resin base material and which changes to a transparent state or an opaque (white turbid) state depending on temperature. This material has the property of becoming transparent when cooled from a specific temperature range T ₁ to room temperature and becoming opaque when cooled to a room temperature from a temperature range T ₂ higher than T _1. It can be printed and erased reversibly.

[0005]

However, in the recording layer of these recording media, it is difficult to obtain a clear image unless there is a large difference between the transparency when transparent and the white turbidity when opaque, but the layer thickness of the recording layer is large. However, the hiding power of the cloudy part tends to be insufficient because the size is not so large.

In the method of recording by reversible change between the transparent state and the opaque state, an image can be easily seen if a reflective layer is placed on the lower surface of the recording layer, but it is still not completely satisfactory.

[0007]

SUMMARY OF THE INVENTION The present invention solves this problem and provides a recording medium in which an image can be easily viewed.
In a recording medium having a visible recording layer made of a synthetic resin material that causes a reversible change between a transparent state and an opaque state on a substrate surface of a recording medium via a metallic reflecting layer, a metallic reflecting layer and a visible recording layer are provided. An air layer is provided between the two.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a front view of a card which is an example of the recording medium of the present invention, and FIG. 2 is a sectional view taken along line ZZ of FIG.

The card 1 uses a polyethylene terephthalate (PET) sheet, paper or the like having high strength as a base material 2,
The metallic reflective layer 3 is provided on the surface thereof. Further, the visible recording layer 5 and the protective layer 6 are formed on the transparent film 4 such as PET.
Are provided, and the both are bonded to each other with an adhesive layer 7 in the peripheral portion. As a result, the air layer 8 exists between the metallic reflective layer 3 and the visible recording layer 5. A display print layer 9 is provided on the surface of the card 1, and a part of the surface is a visible recording display window 10. A magnetic recording layer may be provided on the back surface of the base material 2.

To form the air layer 8, a transparent film having a cutout corresponding to the visible recording display window 10 is inserted as a spacer to form the air layer 8 only in the visible recording display window 10. You can also The thickness of the air layer 8 is 5 to 500 μm, preferably 10 to 300 μm.
It can be μm.

The visible recording layer 5 is made of a synthetic resin material showing a visible reversible change between a transparent state and an opaque state. For example, this material is disclosed in JP-A-55-154198 and JP-A-5-154198.
8-45998 and the like, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinylidene chloride,
Higher fatty acids, saturated aliphatic dicarboxylic acids, higher fatty acid esters, higher ketones, etc. are dispersed as organic low-molecular substances in transparent synthetic resins such as vinylidene chloride copolymers, polyesters, polyamides, polystyrenes, polymethyl (meth) acrylates, etc. It consists of a composition.

This recording material becomes transparent when heated at a temperature T ₁ (for example, 70 to 100 ° C.) by a heating means such as a thermal head, a heating stamp, and a heating roll. Next, if this transparent recording material is locally heated to a temperature T ₂ higher than T ₁ by a thermal head, a heating stamp, etc., only the heated portion becomes opaque (cloudy) and a visible image is displayed. can do. In order to erase the image, heating to the temperature range T ₁ may be performed again.

The metallic reflecting layer 3 is made of aluminum,
A metal vapor-deposited layer of tin or the like, a paint layer mixed with foil, aluminum powder or the like is preferable.

A protective layer 6 may be provided on the surface of the visible recording layer 5 if necessary. This protective layer 6 is effective for preventing deterioration of the recording material due to heating during recording and erasing,
For example, a film or paint of a synthetic resin having high heat resistance such as PET, polyetherimide, polyetheretherketone, polysulfone, polyphenylene sulfide, polyarylate, or polyimide can be used.

This card 1 can be used, for example, as a prepaid card for entrance, shopping, rental, etc. By displaying the used amount and the remaining amount together with magnetic recording on the visible recording layer 5 every time it is used, the card 1 is always accurate. You can know the remaining balance.

[0016]

【Example】

(Example) On the surface of a transparent PET film having a thickness of 50 μm, a recording material composed of the following composition was dissolved in tetrahydrofuran, applied and dried to form a visible recording layer having a thickness of 10 μm. Vinyl chloride-vinyl acetate copolymer 100 parts by weight (MRP-TS manufactured by Nisshin Chemical Co., Ltd.) 12-tricosanone 35 parts by weight 2,12-tetradecanedioic acid 15 parts by weight Then, as a protective layer on the visible recording layer. 2 μm P
ET film was pasted.

On the other hand, aluminum is vapor-deposited on the surface of a 188-μm-thick PET sheet (base material) having a back surface coated with a magnetic paint in a thickness of 10 μm, and the above-mentioned transparent PET film is adhered to the periphery thereof with an adhesive. Forming an air layer,
Further, printing for forming a visible recording display window was performed on the upper surface of the protective layer, and punched into a card shape. This card becomes transparent when the visible recording layer is cooled from around 85 ℃ to room temperature,
It becomes opaque when cooled from around 110 ° C.

(Comparative Example 1) A magnetic coating having a thickness of 10 μm is provided on the back surface.
Aluminum was vapor-deposited on the surface of a PET sheet (base material) having a thickness of 188 μm applied to m, and a visible recording layer having a thickness of 10 μm was formed on the aluminum sheet. Then, a PET film having a thickness of 2 μm was adhered thereon as a protective layer, and printing was performed to form a visible recording display window on the upper surface of the protective layer to prepare a card. (Comparative Example 2) A card was prepared in the same manner as in Comparative Example 1 except that black printing was performed instead of aluminum vapor deposition.

Characters were printed on each of the obtained cards with a thermal head at a printing energy of 2 joules / cm ² , and the sharpness of these printed characters was visually evaluated. As a result, in the examples, the characters were very clear and easily visible. In Comparative Example 1, the characters were clear, but the visibility was worse than in the Examples, and in Comparative Example 2, the sharpness was poor.

[0020]

INDUSTRIAL APPLICABILITY The recording medium of the present invention is a recording medium having a visible recording layer made of a synthetic resin material which causes a reversible change between a transparent state and an opaque state through a metallic reflective layer on the surface of a substrate, By providing the air layer between the reflective layer and the visible recording layer, the visibility of the image formed on the visible recording layer is enhanced.

[Brief description of drawings]

FIG. 1 is a front view of a card which is an example of a recording medium of the present invention.

FIG. 2 is a sectional view taken along line ZZ in FIG.

[Explanation of symbols]

 1 Card 2 Base Material 3 Metallic Reflective Layer 5 Visible Recording Layer 8 Air Layer

Claims (1)

[Claims] 1. A recording medium having a visible recording layer made of a synthetic resin material which causes a reversible change between a transparent state and an opaque state on the surface of a base material of a recording medium through a metallic reflecting layer, wherein the metallic reflecting layer is provided. A visible recording medium, wherein an air layer is provided between the visible recording layer and the visible recording layer.