JPS6057591B2 - Copying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for obtaining an image and at the same time a copy thereof by electrophotography or electrostatic printing.

Conventionally, there are copying methods by transfer, such as those in which a sublimation transfer layer containing a sublimation dye is provided on the back surface of a support, and those in which a melt transfer layer containing colored wax is provided.

These have the disadvantage that the components of the transfer layer tend to migrate naturally during storage after being superimposed on the object to be transferred, contaminating the surface of the underlying layer.

As a result of intensive research to improve the above-mentioned drawbacks, the present inventors used a sheet in which a layer having heat-melt transferability and heat-sensitive coloring property was provided on the back side of a support having heat conductivity. After transferring the toner to the surface of the toner, the entire surface is irradiated with infrared rays to fix the toner, and at the same time, the transfer layer on the back side melts and develops color, which is then transferred to the object to be transferred, thereby making it possible to make copies, and the present invention was completed.

That is, the copying method of the present invention is characterized by including the following steps.

a Step of preparing a heat-sensitive recording sheet for copying having a heat-sensitive coloring layer having heat-melting transferability on one side of a support having heat conductivity Step of forming a toner image on the other side of the sheet c Steps below Step (d) of bringing the transferred object into close contact with the thermosensitive coloring layer side of the sheet by d) fixing the toner image by irradiating the entire surface with infrared rays from the side with the toner image, and at the same time fixing the toner image on the thermosensitive coloring layer. Step 7 of transferring a colored portion that has developed a color corresponding to the fixed toner image to a transfer object.The present invention will be described in detail below.

First, explanation will be given with reference to the drawings. FIG. 1 is a schematic sectional view conceptually showing the transfer of a toner image 3 from a thermosensitive recording sheet A for copying, for example, an electrophotographic photoreceptor 4 in the present invention. Sheet A has a heat-sensitive coloring layer 2 (with thermal melt transferability) on one side of a support 1 with thermal conductivity (
Hereinafter, it has a structure having a heat-sensitive coloring melt transfer layer). Next, as shown in FIG. 2, the transfer object 5 is placed on the sheet A.
It adheres closely to the surface of the heat-sensitive coloring melt transfer layer 2. Next, as shown in FIG.
By irradiating the entire surface with infrared rays L from the side, the toner image is fixed and at the same time, copying is performed. In this way, the colored portion 2A is obtained in the layer 2 at the same time as the fixed toner image 3A. Therefore, as shown in FIG. 4, when the sheet A and the transfer target 4 are peeled off, the fixed toner image 3 is left on the thermosensitive color recording layer 2 of the sheet A.
At the same time, the heat-sensitive color-developing fusion transfer layer 2 develops color on the transfer target 5, and a transferred color-developing copy area 2A is obtained at the same position and in the same pattern as the fixed toner image 3A. In the above description, an example is shown in which the transfer object 5 is brought into close contact with the sheet A after the toner image 3 is formed, but the transfer object 5 may be brought into close contact with the sheet A before the infrared rays L are irradiated.

Therefore, although not shown, it is also possible to provide the toner image 3 on the surface of the sheet A after the transfer target 5 is brought into close contact with the sheet A. In the above method, electrophotography or electrostatic printing method is used as a method for forming a toner image.

The material for the support that constitutes the sheet A needs to have thermal conductivity, and paper, synthetic paper, plastic film, etc. can be used, but paper of 30 to 50qI7T1 is preferred as it has good thermal conductivity. It is suitable. The materials for the heat-sensitive color-forming melt transfer layer 2 in the present invention include a color former or developer, a low melting point substance as an additive, and a binder.

Regarding color formers and color developers, for example, leuco dyes and...
Materials containing in combination with phenolic compounds can be used. Leuco dyes used include triphenylmethane-based dyes such as crystal violet lactone and malachite green lactone, fluoran-based dyes such as 1,2-bento-6-diethylaminofluorane, and other auramine-based dyes, phenothiazine-based dyes, and spiropyran-based dyes. can. In addition, the above-mentioned phenolic compounds include phenol, 0-cresol, P-cresol, P-ethylphenol, tert-butylphenol, 2,6
- ditertiarybutyl, 4-methylphenol, nonylphenol, dodecylphenol, styrenated phenol, 2,7-methylenebis(4methyl-6-
tert-butylphenol), α-naphthol, β
- Naphthol, hydroquinone monomethyl ether, guaiacol, eugenol, P-chlorophenol, P
-bromophenol, 0-bromophenol, 10-chlorophenol, 2,4,6-trichlorophenol,
0-phenylphenol, P-phenylphenol, P
-(P-chlorophenyl)phenol, 0-(0-chlorophenyl)phenol, salicylic acid, methyl P-oxybenzoate, P-oxybenzoate ester, propyl P-oxybenzoate, butyl P-oxybenzoate, P-oxy Octyl benzoate, dodecyl P-oxybenzoate,
Catechol, hydroquinone, resorcinol, 3-methylcatechol, 3-isopropylcatechol, P-tertiarybutylcatechol, 2,5-ditertiarybutylhydroquinone, 4,4''-methylene diphenol, bisphenol All, 2-dioxynaphthalene ,2,3
Dioxynaphthalene, chlorcatechol, bromocatechol, 2,4-dihydroxypenzophenone, phenolphthalein, O-cresolphthalein, methyl protocatechuate, ethyl protocatechuate, propyl protocatechuate, octyl protocatechuate , dodecyl protocatechuate, pyrogallol, oxyhydroquinone, phloroglucin, 2,4,6-trioxymethylbenzene, 2,3,4-trilioxyethylbenzene, gallic acid, methyl gallate, ethyl gallate, propyl gallate, Butyl gallate, hexyl gallate, octyl gallate, dodecyl gallate, cetyl gallate,
Stearyl gallate, 2,3,5-trioxynaphthalene, tannic acid, phenolic resin, etc. can be used. The low melting point substances mentioned above include waxes such as paraffin wax, microcrystalline wax, polyethylene wax, beeswax, white wax, white wax, and carnauba wax;
One type or a combination of two or more types of stearic acids such as stearic acid, stearamide, and metal stearate can be used. As a binder, water-soluble resins such as polyvinyl alcohol, methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, methyl vinyl ether maleic anhydride copolymer, polyacrylic acid, gelatin, gum arabic, xylene resin, phenol resin, coumarin resin, etc. Oil-soluble resins such as vinyl toluene resin, vinyl acrylic resin, and terpene resin can be used. The appropriate coating amount of the heat-sensitive coloring melt transfer layer is 5 to 15 yId in a dry state.

Appropriate coating methods for providing the heat-sensitive coloring melt transfer layer include roll coating, air knife coating, and gravure coating. In the above, the material to be transferred may be paper, synthetic paper, plastic film, or the like.

According to the method of the present invention, since the heat-sensitive color-developing melt transfer layer develops color from the interface with the support, there is little influence of thermal diffusion, so the image is very clear.

In addition, excellent resolution is obtained, with no image blurring caused by interlayer separation between the image and non-image areas in the transfer layer.
Ru. Next, the present invention will be explained in more detail with reference to Examples.

In addition, in the following text, "parts" are "parts by weight." Example 1 Ink No. l Crystal Violet Lactone 10m 10% polyvinyl alcohol aqueous solution 100m Ink No. 2
4●4″-Isopropylidene diphenol Part: Stearic acid bisamide 1 Part: Paraffin wax 5% polyvinyl alcohol aqueous solution: 10 Part: Water
Ink No. 10 above. l and ink No. 2 and 2 were each dispersed in glass beads using a stirrer.

Ink No. 30 on high quality paper. l and ink No. 2
A heat-sensitive recording sheet for copying was obtained by applying a heat-sensitive coloring melt-transfer ink prepared by mixing a dispersion of the above in a ratio of 1:5 in a dry coating amount of about 10yITrt.

Next, the thermosensitive color-developing melt transfer layer on the back side of the sheet was combined and adhered to a high-quality paper (subject to be transferred).

Next, a toner image was formed on the zinc oxide master using an electrophotographic method, and then transferred to the surface of the sheet on which the heat-sensitive coloring melt transfer layer was not provided. Next, as a result of irradiating the entire surface with an infrared flash, a fixed toner image was obtained on the surface, and a clear blue image was simultaneously obtained on the high-quality paper as the transfer target.

Example 2 Ink No. l Fluonine-based leuco dye (?B flower + instep) Nod 10% rosin modified phenolic resin mineral spirit solution
10 Ink No. 24●4″-
Isopropylidenzine phenol 40f! I) Bismide stearate 20m microcrystal wax 5 parts paraffin wax
5 parts 10% - Rosin modified phenolic resin mineral spirit solution 100
mMineral Spirit 15 Ink No. l and ink No. 2 and 2 were obtained by dispersing each in a stirrer containing glass beads.

This ink No. l and ink No. 2 were mixed at a ratio of 1:5 to obtain a heat-sensitive coloring melt transfer ink. This mixed solution was applied to the back surface of the above-mentioned high-quality paper using a roll coating method in a dry coating amount of about 10 f1, and dried to obtain a heat-sensitive recording sheet for copying. Next, the heat-sensitive color-developing melt transfer layer on the back side of the sheet was aligned and adhered to a high-quality paper (subject to be transferred).

Next, a toner image was formed on the surface of the sheet in a straight line using an electrostatic screen printing method. Next, as a result of irradiating the entire surface with an infrared flash, a fixed toner image was obtained on the surface, and a clear black image was simultaneously obtained on the high-quality paper as the transfer target.

- Brief Description of the Drawings FIGS. 1 to 4 are schematic sectional views conceptually showing each step of the copying method of the present invention.

1...Support having thermal conductivity, 2...
・Thermosensitive coloring melt transfer layer, 2A... Coloring part, 3.
...Toner image, 3A...Fixed toner image, 4...Electrophotographic photoreceptor, 5...Transferred object, A... Thermal recording sheet for copying, L...
...Infrared rays.

Claims (1)

[Claims] 1. A copying method including the following steps. a Step of preparing a heat-sensitive recording sheet for copying having a heat-sensitive color forming layer having heat-melting transferability on one side of a support having heat conductivity b Step of forming a toner image on the other side of the sheet c The following steps Step d of bringing the transfer object into close contact with the heat-sensitive coloring layer side of the sheet by d. At the same time fixing the toner image by irradiating the entire surface with infrared rays from the side with the toner image, A step of transferring a color-developed portion corresponding to the fixed toner image to a transfer target. 2. The copying method according to item 1, wherein the toner image is formed by an electrophotographic method. 3. The copying method according to item 1, wherein the toner image is formed by an electrostatic printing method.