JPS6068993A - Photo-thermal conversion type thermal transfer recording medium - Google Patents

Abstract

PURPOSE:To provide the titled medium capable of producing a clear and fast transfer- recording image when being irradiated with xenon light or the like, wherein a specified electric discharge breaking recording sheet and a thermal transfer recording sheet obtained by applying a thermally transferrable composition to a base having a photo- thermal converting function are laminated on each other with the bases in contact with each other. CONSTITUTION:For example, the electric discharge breaking recording sheet wherein a light-reflective layer (preferably a vapor-deposited film of aluminum, zinc or the like) 1 capable of being partially removed by breaking by electric discharge is provided on a light-transmissive sheet form base (preferably, a resin film, a tracing paper or the like) 2 and the thermal transfer recording sheet wherein a base (preferably, a carbon fiber paper or the like) 6 having a photo-thermal converting function is coated or impregnated with a thermally transferrable composition (e.g., a composition comprising a phthalocyanine pigment or the like and a wax or the like as main constituents) 5 are laminated on each other with the bases in contact with each other to obtain the objective thermal transfer recording medium. USE:Suitable for obtaining a transferred color image.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal transfer recording medium, and particularly to a thermal transfer recording medium that utilizes photothermal conversion. Further, the photothermal conversion type thermal transfer recording medium of the present invention is particularly suitable for obtaining J-C images.

Conventionally, 15 types such as condenser paper and PET film have been used.
A thermal transfer recording medium, which has a thermal transfer layer mainly composed of wax and a colorant, or a thermal sublimation injection dyeing 4', F layer mainly composed of a heat sublimable dye, is placed on a thin support of μ or less. A method of obtaining a transfer record on an image-receiving sheet using a method is widely used, but the transfer record using this method lacks the clarity of the record and the fastness of the record is also poor.

In addition, a light-transmitting sheet I-shaped support"2, by discharge destruction,
Photothermal conversion type thermal transfer recording media, which have a partially removable infrared reflective layer and a thermal transfer layer containing photothermal conversion substances such as horn and graphite on the pond side, are also used in commuter pass issuing systems, etc. has been done.

In this case, the photothermal conversion substance functions as a coloring agent and fT
Therefore, it is not suitable for producing good results for blackish recordings or for obtaining color recordings. That is, it is possible to mix and use a pigment with a light-to-heat converting substance such as carbon or graphite in the thermal transfer layer, but the light-to-heat converting function is 111 (light-to-heat conversion function is 111). When performing conversion thermal transfer recording, the photothermal conversion substance is also transferred to the resulting thermal transfer record together with the dye or pigment of the desired color, so the hue of the resulting record is different from the original hue and is dark and lacks brightness. becomes.

In addition, a heat-sublimable dye is used as the dye of this system, a relatively heat-resistant resin is used as the binder, and the heat generated by the photothermal conversion with the photothermal conversion substance is used to sublimate the image receiving sheet I. A method for obtaining a transferred image has also been proposed (Japanese Unexamined Patent Publication No. 53-53
1337>. Furthermore, for the purpose of obtaining a color image, a heat-sublimable dye layer was provided on the back side of the zinc oxide photosensitive paper, and after the photosensitive surface was developed with a carbon-containing toner, , an image-receiving sheet is closely attached to the heat-sublimable dye layer, and infrared rays are irradiated from the zinc oxide photosensitive paper side to raise the temperature of the tree image.The heat is transferred to the heat-sublimable dye layer, and the heat of the dye is transferred onto the image-receiving sheet. A method of obtaining a sublimation transfer image has also been proposed.

However, the records obtained using this type of thermal sublimation dyeing 11 are poor in fastness.

In addition, in order to improve thermal sublimation transfer efficiency, it is effective to lower the sublimation initiation temperature of the dye used, but the fastness of the resulting record decreases to 11. On the other hand, in order to improve the fastness of recording, it is generally better to use a material with a high sublimation start temperature, but this is not good in terms of transfer efficiency because the energy required for sublimation becomes high.

In addition, in transfer recording of sublimable dyes by applying high energy for a short time, sublimation 1 raw dyeing and I+ thermal melt transfer 0 tend to occur at the same time, and the resulting rerecording lacks sharpness.
J is a record with no color saturation.

The purpose of the present invention is to create a clear record without any defects.
-I. Is it possible to use a buggy light source, especially a light source such as xenon light, to obtain a durable and clear transfer record through photothermal conversion caused by short-term irradiation of light? i is simply 14, and provides a fully matured conversion type thermal transfer recording medium particularly suitable for obtaining a non-see transfer image.

In the present invention, a discharge destruction recording sheet 1- is provided with a luminous intensity layer that can be partially removed by discharge destruction on a sheet-like support that transmits light, and a support that has a photothermal conversion function. This objective is achieved by using a photothermal conversion thermal transfer recording medium in which thermal transfer recording sheets coated with or impregnated with a thermal transfer composition are laminated so that the supports are in close contact with each other.

The present invention will be explained below with reference to the drawings. 1 to 3 are configuration diagrams of a photothermal conversion type thermal transfer recording medium according to the present invention, respectively. 1 in the figure is a discharge breakdown recording device that has been widely used in the past, and can record in any pattern by vapor deposition of aluminum, zinc, etc.! This is a light-reflecting layer made of a pattern. 2 and 3 are light-transmissive sheet-like supports, and various resin films, tracing paper, glassine paper, coating paper, resin-impregnated paper, cellophane, etc. are used.

3' is a support that is not concerned with light transmittance, and high-frequency paper made of natural fibers, synthetic fibers, etc., resin-impregnated paper, and various resin films can all be used.

In particular, a thinner layer is preferable, and a thickness of 15 μm or less is particularly advantageous for the present invention because it reduces heat transfer loss.

4 is a photothermal conversion layer in which a photothermal conversion material such as horn, graphite, carbon paper ♀1 [or black metal powder, metal oxide powder, gold oxide powder, etc.] is applied together with an appropriate binder. Created by As a binder, polycarbonate, epoxy resin, amide resin, imide resin, polysulfone, borif 1. Nylene, ester resin, polyvinyl alcohol, polyvinyl chloride, silicone type 40
1 fat, acrylic resin, cellulose JIS P
A heat softening temperature of 120°C or higher as measured by -2531 is preferable, but even if the heat softening temperature is lower than this, heat resistance can be improved by using a hardening agent or a crosslinking agent.
You can use all of them if you press them. Further, as for No. 4, the purpose can be achieved by using a vapor-deposited film of a black metal, metal oxide, or sulfide.

5 is a thermal transfer recording layer, which contains horn-based pigments, lids, 1, Hendesin-based AI, Kina91-N, [-Damin-based lakes, nonormin-based pigments, and inorganic and organic NFI; fit or/and various dyes (Jj, candelici wax, rice wax, nonoruzuichiha)
] Waxes such as shellac, monoclinic acid wax, microcrystalline wax, paraffin wax, and/or butyral resin, vinyl acetate resin, acrylate resin, olefin-based 4tLj resin, styrene-based resin, alkyd-based resin, rosin-based resin This patent is characterized by thermoplastic resins such as resins, and oils, plasticizers, non-colored pigments, etc. can be added as necessary. 6
is a support having a light-to-heat converting function, such as a film or carbon fiber paper in which a light-to-heat converting substance is kneaded into a relatively heat-resistant resin. 7 is a support 3 or 3' and a photothermal conversion layer 4
A support having a photothermal conversion function consisting of:

Next, FIGS. 4 to 7 are explanatory diagrams of the recording process when the photothermal conversion type thermal transfer recording medium of FIG. 1 is used. As shown in Fig. 4, first record the desired pattern on the discharge breakdown recording sheet using the usual method, then overlap the thermal transfer recording sheet and support so that they are in close contact with each other as shown in Fig. 5, and then as shown in Fig. 6. (The image receiving sheet 18 and the thermal transfer layer 5 are stacked so that they are in close contact with each other, and when high energy light such as xenon light is irradiated from the light source 9 for a short period of time from the discharge destruction recording sheet side, the remaining portion of the light reflective layer is irradiated. Where the light is reflected and partially removed by discharge destruction, it passes through the light-transmitting supports 2 and 3 and reaches the photothermal conversion layer 4, where the irradiated light is converted into heat.

This generated heat is transferred to the thermal transfer layer, softening the transfer layer,
The adhesive force with the melted image-receiving sheet is greater than the adhesive force with the support 3. After recording in this manner, the image-receiving sheet is separated, and a thermal transfer recording of a desired hue is obtained on the image-receiving sheet. In addition, in FIG. 4, recording is first performed on the discharge breakdown recording sheet, or the recording is not limited to this, but the recording is carried out at the stage where the discharge breakdown recording sheet and the thermal transfer recording sheet are superimposed, or when the image receiving sheet is also superimposed. You may record it after matching.

In this way, in thermal transfer recording, since recording is obtained by utilizing the difference in adhesive force between the thermal transfer layer and the support during hot melting and cooling, and between the thermal transfer layer and the image receiving sheet, the material A' ) Sufficient attention must be paid to collaboration.

Further, in order to prevent the spread of heat in the t and i directions and improve the clarity of recording, it is desirable that the thickness of the support having a photothermal conversion function and the photothermal conversion layer be thin (and uniform).

The discharge destruction recording sheet of the photothermal conversion type thermal transfer recording medium according to the present invention can be used repeatedly, so that any number of identical copies can be obtained by changing the supply of thermal transfer recording sheets. It is also possible to obtain identical copies with different hues by using thermal transfer recording sheets I with different hues.

Furthermore, when recording the discharge breakdown recording sheet, the J signal is a signal obtained by color-separating the original document, for example, a signal separated by color with red, green, and blue filters, and is recorded on three discharge breakdown recording sheets, each corresponding to the other. By using a thermal transfer recording sheet having shiman, magenta, and yellow transfer layers and superimposing the colors on one image-receiving sheet, color copies can be made.

Hereinafter, the present invention will be explained in more detail by showing specific examples of the present invention, but these are not intended to limit the scope of the present invention. Note that the numbers in the examples are parts by weight unless otherwise specified.

Example 1 10 parts of urethane resin (Crispan 7209 Large 1, manufactured by Hon Ink Kagaku Kogyo Co., Ltd.), 1.5 parts of fine powder silica, and 87.5 parts of ethyl acetate were thoroughly mixed and dispersed, and a crosslinking agent (Crispan NX Dainippon Co., Ltd.) was thoroughly mixed and dispersed. Ink chemistry −+−fit=1+mu+
Lil! '1111tl! -/,'-4++-;J-:
Mu41y! --Or,, Dry coating on polyester film to give a fit of 4 g/l+e, place a nearly transparent roughened layer 3, and add 6 layers of aluminum on top of this.
Vacuum deposition was performed to obtain 0OA, and a discharge breakdown recording sheet was prepared.

Next, 10 parts of polyester resin (saturated copolymerized polyester resin ER-3200 manufactured by Nippon Nisdel Co., Ltd.), 1 part of carbon black, and 89 parts of methyl ethyl cane were added.
Paint conditioner (Re(1, Devil I)
++c, Inc.) was thoroughly mixed and dispersed on a 50U polyester film at a dry weight of 5g/n? A photothermal conversion layer was installed.

5 parts of phthalocyanine blue, 1 part of oligostyrene
) SMS-11 (manufactured by Sanko Kagaku Co., Ltd. 11) 45 parts and 50 parts of I. luene were mixed and dispersed with a paint conditioner,
A thermal transfer recording sheet was prepared by coating the photothermal conversion layer at a dry weight of 4 g/111 and applying the thermal transfer layer in layers.

First, a discharge breakdown recording sheet was used to record a pattern in the form of a pattern by applying a human signal at an applied voltage of 45 V using a conventional discharge recording device. Next, the seven supports of the thermal transfer recording sheet are stacked so that they are in close contact with each other, and the basis weight is adjusted to [30 g/n?] so that the seven supports are in close contact with each other. The high-quality papers were stacked one on top of the other, and xenon light of about 600 Joules (energy combined with capacitor capacity and voltage) was irradiated from the discharge breakdown recording sheet side as shown in FIG. Use high-quality paper as a recording medium! After 11 days, a clear blue AT record was obtained on high-quality paper.

Example 2 Using the discharge breakdown recording sheet of Example 1, signals obtained by color-separating the original using red, green, and blue filters were applied, and discharge breakdown recording was performed on three corresponding sheets.

A magenta color thermal transfer recording sheet was prepared by using rhodamine lake pigment in place of the phthalocyanine blue pigment in the thermal transfer recording sheet of Example 1, and a yellow color thermal transfer recording sheet was prepared by using benzidine yellow Kao-O 1. The cyan color thermal transfer recording sheet used in Example 1 was used as it was. First, the original was color-separated using a blue filter, and the signals were recorded on the discharge destruction recording sheet and the Ikoro color thermal transfer recording sheet, with a basis weight of 100 g/n.
? The art papers were closely stacked and a yellow transfer image was created on the art paper in the same manner as in Example 1. Then, the position was aligned and the discharge breakdown recording sheet, which had been color-separated using a green filter. ,
The magenta color transfer images were superimposed using a xenon light flash in the same manner as superposition.

Furthermore, when the transferred color was superimposed on Art S (1) using a discharge breakdown recording sheet recorded with signals separated by color with a red filter and a cyan color thermal transfer recording sheet, a clear non-see transfer image was obtained. In addition, the three electrical discharge destruction recording sheets on which the original was color-separated had a thermal transfer layer, and they were used 10 times by simply replacing them with new ones. It was in usable condition.

[Brief explanation of the drawing]

FIGS. 1 to 3 are block diagrams of the photothermal conversion type thermal transfer recording medium of the present invention, and FIGS. 4 to 'tS7 are diagrams showing the recording process when the recording medium of the present invention is used. 1...Light reflective layer 2...Transparent support■ 3...Transparent support■3'...Support Body 4...Light-heat conversion layer 5...Thermal transfer layer 6...Light-heat convertible support 7...
. . . Photothermal convertible support 8 . . . Image receiving sheet 9, . . . 4. Light Source Patent Applicant Co., Ltd. Tomoe Paper Mill Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] A light pressure 4.1 layer that can be partially removed by discharge breakdown is provided on a light-transmissive sheet-like support (a discharge breakdown recording sheet and a support having a photothermal conversion function are coated with a thermal transferable composition or A photothermal conversion type thermal transfer recording medium in which impregnated thermal transfer recording sheets are stacked so that the supports are in close contact with each other.