JPH0580506A - Recording medium - Google Patents

Abstract

PURPOSE:To obtain a recording medium free from special consideration for storage, handling and abandoning method in the recording medium using a photosensitive composition. CONSTITUTION:The microcapsule layer 2, which holds a photosensitive microcapsule 4 on the supporting body on which aluminum is vapor-deposited, is provided. The reversible thermosensitive layer 3 is formed on the upper layer. The reversible thermosensitive layer 3 is usually colored but becomes transparent with heating at the time of image information exposure and the photosensitive microcapsule 4 is exposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a character or image recording medium, and more particularly to a character or image recording medium using a photosensitive composition.

[0002]

2. Description of the Related Art Conventionally, an image forming method using a photosensitive material is disclosed in US Pat. Nos. 2,548,366 and 4,399,209.
Nos. 4,416,966 and 4,576,891, JP-A-48-65011, and JP-A-48-954.
20, No. 51-16807, No. 57-1243
No. 43, No. 57-179836, No. 57-197.
No. 538, No. 58-88739, No. 58-887
40, 60-259490, 61-130
No. 945, No. 61-275742, No. 62-16
2147, 62-2174195, 62-2
No. 09444 and No. 62-209531.

The general ones are as follows. Light of image information is applied to the photosensitive microcapsules containing the photosensitive composition uniformly applied to the surface of the support. The photosensitive microcapsules that were not exposed to light during this exposure are in an unreacted state. After the exposure, a treatment such as heating is performed if necessary. After the post-treatment, the uncured photosensitive microcapsules are destroyed by a method such as pressing or heating to transfer the inclusions to the non-transfer medium.

[0004]

However, the recording medium as described above must be managed very strictly in the storage state or the state in which it can be placed in the image recording process. That is, it should never be exposed to light other than image information light. Therefore, there is a problem in that the storage container and the image forming apparatus are expensive, and the recording medium cannot be used due to exposure due to unpredictability, which results in a high running cost.

Further, on the recording medium after image development, an image remains in the form of a negative image recording depending on the image forming method, and attention has to be paid to the disposal method.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a recording medium which does not require special care in storage, handling and disposal methods.

[0007]

In order to achieve this object, the recording medium of the present invention has a photosensitive composition, which is cured or softened by light, held on a support, and the photosensitive composition is exposed. The surface is protected by a reversible thermosensitive composition that develops or disappears by heat.

Examples of the photosensitive substance which reacts upon exposure according to the present invention include US Pat. Nos. 4,399,209 and 4416.
966 and 4440836, each specification, JP-A-5
No. 7-124343, No. 57-179836, No. 57-197538, No. 58-88739, No. 58-88740, No. 61-130945, No. 61-275742, No. 62 Examples of the publications, etc. of No. 174195 are listed, but not limited to these. Further, the shape thereof may be microencapsulated, may be directly coated on the support, or may be held on the particles.

The photosensitive microcapsules can be manufactured by a method known in the art. For example, US Pat. No. 27
No. 30456, No. 2800457 and No. 28004
No. 58, No. 2969331, No. 3111407
No. 3,283,383, No. 3,287,154, No. 3,418,250, No. 3,551,346, and No. 35.
No. 76660, No. 3578605, No. 36603.
No. 04, No. 3726803, No. 3755190.
No. 3773695, No. 3793268, No. 3796669, No. 3803046, No. 38.
No. 16331, No. 4001140, No. 40254
55, No. 4087376, No. 4089802, British Patent No. 927807, No. 930422.
No. 965074 and No. 990443, Canadian Patent No. 879043, Japanese Patent Publication No. 36-
No. 9168, No. 38-19574, No. 42-44
No. 6, No. 42-771, No. 48-40347,
The method is disclosed in each of the publications of Sho-49-24159, Sho-51-28589 and Sho-52-12150. However, it is not limited to these. Further, the outer wall forming material preferably has a property of sufficiently transmitting light.

As the reversible heat-sensitive composition which develops or disappears by heat, there are disclosed in JP-A-50-81157 and JP-A-50-157.
105555, 54-119377, 55
-154198, 58-191190, 6
No. 0-193691, No. 63-39377, No. 63
-41186, Do 63-84978, Do 63-
145080, 63-280684, 64
-14077, JP-A-2-117888, and JP-A-2-
117892, Dohei 2-188293, Dodai 3-7
Those disclosed in the respective publications of No. 377 and the like are listed. However, it is not limited to these. Moreover, one or two or more of these reversible heat-sensitive compositions are mixed and used.

As a method for protecting the photosensitive composition, the reversible heat-sensitive composition can be applied on the entire surface after applying the photosensitive composition on the support, or the photosensitive composition can be applied on the support. It can be used as a mixture with a binder when applied. Known binders are used as the binder. For example, acetal resin, acrylic resin, cellulose acetate, ethylene-vinyl acetate copolymer, ABS, AS and the like can be mentioned. As a general support, paper, glass, film, metal, ceramic or the like can be used, but it is required that it has good wettability with a binder, has a light shielding property, and can withstand pressurization and heating.

[0012]

In the recording medium of the present invention having the above-mentioned constitution, the reversible heat-sensitive composition develops color during the production, and it is not exposed to light during usual handling. By heating immediately before exposing image information, the reversible heat-sensitive composition is decolored and the photosensitive composition is exposed to light. At this time, the temperature required for decoloring the reversible thermosensitive composition is preferably 10 ° C. or more higher than the temperature expected during storage and 10 ° C. or more lower than the temperature required during development.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic sectional view of this embodiment. Photosensitive microcapsules 4 on support 1 with aluminum vapor deposition
There is a microcapsule layer 2 in which The reversible thermosensitive layer 3 is formed on the upper layer.

Next, a method of manufacturing the recording medium of this embodiment will be described.

The photosensitive microcapsules 4 used in the present recording medium are microcapsules containing at least a pigment body and a photocurable substance, and having mechanical strength changed in response to light. The photocurable substance is a mixture of a polymerizable compound and a photoinitiator. This encapsulated substance is emulsified in water and encapsulated inside the outer wall of the resin by a known microencapsulation method such as an interfacial polymerization method, an in situ method, and a powder atomization granulation method to obtain photosensitive microcapsules 4. Polyvinyl alcohol is dissolved in the obtained aqueous dispersion solution of the photosensitive microcapsules 4. This solution is applied to the support 1 and dried.

On the microcapsule layer 2, behenic acid,
A reversible thermosensitive layer 3 was formed by applying a solution prepared by mixing and dispersing a vinyl chloride-vinyl acetate copolymer and silica in tetrahydrofuran, and drying the solution. In this way, the present recording medium was obtained.

Next, image formation using this recording medium will be described.

The recording medium was placed on a hot plate so that the support 1 was in contact with the plate surface. The OHP paper was placed so that the reversible thermosensitive layer 3 of the present recording medium and the image surface of the OHP paper on which the image was drawn were in contact with each other. The hot plate was heated to 65 ° C., and when the reversible thermosensitive layer 3 became transparent, a halogen lamp was irradiated from the back surface of the OHP paper.

The recording medium and the OHP sheet were overlapped and moved to a dark room, the OHP sheet was peeled off, and the transfer target sheet was pressed against the surface of the reversible thermosensitive layer 3 of the recording medium. Through the above steps, the same image as the OHP paper was obtained on the transfer paper.

The image forming apparatus of the present invention is not limited to the above-described embodiment, but can be modified in structure and operation without departing from the scope of the claims.

[0022]

As is apparent from the above description, by using the recording medium of the present invention, it is not necessary to pay special attention during storage or handling, and the image forming apparatus and running cost are reduced. In addition, by heating the recording medium after development at the color development temperature, the development mark becomes invisible, the secret of the developed product can be secured, and no special attention is paid to the disposal method.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment of the present invention.

[Explanation of symbols]

 2 Microcapsule layer 3 Reversible thermosensitive layer

Claims (1)

[Claims] 1. A photosensitive composition which is cured or softened by light is held on a support, and an exposed surface of the photosensitive composition is protected by a reversible thermosensitive composition which develops or discolors by heat. A recording medium characterized by being present.