JPH0299387A - Transfer recording medium - Google Patents

Abstract

PURPOSE:To enable a high quality high sensible two colored image with little fog and little blank to be formed by a method wherein a recording layer on a base material is composed of two kinds of element assemblies having each specific absorbing wavelength and each specific hue of which a transfer characteristic varies when heat and light energy are applied thereto. CONSTITUTION:A recording layer on a base material is composed of 2 kinds of element assemblies A, B of which transfer characteristics vary by application of heat and light energy, and said element assemblies contain a compound having ethylene unsaturated double bond, a pigment, and a photopolymerization initiator. Then, for the element assembly A, maximum absorbing wavelength of the photomerization initiator is 430nm or under, and its hue turns red or blue. For the element assembly B, the maximum absorbing wavelength of the photopolymerization initiator is 430 to 600nm, and its hue turns black. Further, a content of the pigment is 5 to 50wt.%. These element assemblies A, B are composed of a microcapsule.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a transfer recording medium used in printers, copying machines, facsimiles, etc., and a method for manufacturing the same.

[Conventional technology]

In recent years, with the rapid development of the information industry, various information processing systems have been developed, and recording methods and devices suitable for each information processing system have also been developed and adopted. One such recording method is the thermal transfer recording method, which uses a lightweight, compact, and noiseless device.
It has excellent operability and maintainability, and has been widely used recently.

This thermal transfer recording method generally uses a thermal transfer medium formed by coating a sheet-like support with a thermal transfer ink made of a heat-melting binder and a colorant dispersed therein. The thermal transferable ink layer is superimposed on the transfer medium so as to be in contact with the transfer medium, and heat is supplied from the support side of the thermal transfer medium by a thermal head to transfer the melted ink layer to the transfer medium. A transfer ink image is formed on a medium according to the shape of heat supply. According to this method, plain paper can be used as the transfer medium.

[Problem to be solved by the invention]

However, conventional thermal transfer recording methods are not without drawbacks. This is because in the conventional thermal transfer recording method, the transfer recording performance, that is, the print quality, is greatly affected by the surface smoothness.Good printing is performed on highly smooth transfer media, but on less smooth transfer media. In some cases, the print quality deteriorates significantly. However, even when using paper, which is the most typical transfer medium, highly smooth paper is rather special, and ordinary paper has various irregularities due to entangled fibers. Therefore, in the case of paper with large surface irregularities, the hot melted ink during printing cannot penetrate into the fibers of the paper and only adheres to the concavities on the surface or the vicinity thereof, resulting in the edges of the printed image not being sharp. or part of the image may be missing, resulting in a decrease in print quality.

In addition, with conventional thermal transfer recording methods, only one color image can be obtained with one transfer, so to obtain a multicolor image, it is necessary to repeat the transfer multiple times to overlap the colors. there were. However, it is very difficult to accurately superimpose images of different colors, and it is difficult to obtain images without color shift. In particular, when focusing on a single pixel, colors are rarely superimposed in a single pixel, and in the end, in conventional thermal transfer recording methods, multicolor images are created by aggregation of pixels with shifted colors. was forming. For this reason, clear multicolor images cannot be obtained using conventional thermal transfer recording methods.

In addition, when trying to obtain multicolor images using conventional thermal transfer recording methods, it is necessary to install multiple thermal heads or to make complicated movements such as reverse feeding and stopping of the transfer medium, which requires the entire device. This method has drawbacks such as large and complicated data and a decrease in recording speed.

The present applicant uses a photothermal sensitive material, and when light energy and thermal energy are applied in accordance with the image signal, the reaction of the material rapidly progresses and the transfer characteristics irreversibly change, causing the image signal to change. He invented an image forming method and a transfer recording medium for forming an image with the above-mentioned characteristics and transferring it to a recording medium, and has already filed a patent application (Patent Application No. 60-1505).
97).

The transfer recording medium of the application can eliminate and improve the problems and drawbacks of the conventional thermal recording method as described above, and the present invention is a further improvement of the transfer recording medium, and has high quality and The main objective is to provide a transfer recording medium capable of forming two-color images with high sensitivity and less fogging and white spots.

[Means for Solving the Problems J] The present invention provides two types of elements (A) in which the recording layer on the support changes transfer characteristics by applying heat and light energy.
, (B), the element body contains at least a compound having an ethylenically unsaturated double bond, a pigment, and a photopolymerization initiator; The agent has a maximum absorption wavelength of 430 nm or less and contains a pigment exhibiting a red or blue hue, and the photopolymerization initiator in the element (B) has a maximum absorption wavelength of 430 to 600 nm. It is in the wavelength range of , and exhibits a black hue.

In the recording medium according to the present invention, it is desirable that the wavelength range of the light to which the photopolymerization initiator used is sensitized is divided into approximately 300 to 600 nm.

Many photopolymerization initiators contain an aromatic ring in their molecules, and the absorption band based on the π-π transition of the aromatic ring exists at 300 nm or less, so they are sensitive to light with a wavelength of 300 nm or less. This makes it difficult to separate the sensitive wavelength ranges. Furthermore, it becomes difficult to obtain sufficient sensitivity with light having a wavelength of 600 nm or more.

The recording medium of the present invention is intended for two-color recording, and has a
By dividing the wavelength range of 600 nm into at least two wavelength ranges, and supporting elements (A) and (B) having photosensitive characteristics in two types of photosensitive wavelength ranges and exhibiting respective hues on a support. configured. The two types of hues in the present invention are a combination of black and red or black and blue,
The two sensitive wavelength ranges are 300-430 nm and 430-6
00 nm.

The present invention provides a recording medium with high sensitivity and no fogging or white spots by limiting pigments exhibiting two types of hues for two types of sensitive wavelength ranges.

It is generally known that when a colorant such as a dye is mixed into a photosensitive composition, the sensitivity of the photosensitive composition is extremely reduced due to light absorption by the colorant. Pigments are mainly used as coloring materials in ultraviolet curing materials such as UV inks, but even when pigments are used, the sensitivity decreases significantly, and it is difficult to achieve image density within a practical range in the recording medium according to the present invention. In addition, in order to perform high-speed recording, it is necessary to optimize the combination of pigment hue and photopolymerization initiator.

Further, a fluorescent lamp may be used as a light source of a recording apparatus in which the recording medium of the present invention is used, and bright lines of mercury generated from a low-pressure mercury lamp significantly reduce hue selectivity. That is, when a fluorescent lamp with an emission peak of 300 to 430 nm is turned on to cure the element (A) with a photosensitive wavelength range of 300 to 430 nm, mercury g-1ine with a wavelength of 436 nm is turned on.
The bright line also accelerates the curing of the element body (B) in the sensitive wavelength range of 430 to 600 nm, and white areas cause deterioration in image quality.

The present invention optimizes the sensitive wavelength range and hue of the element for the purpose of high sensitivity and wavelength selectivity of the element (reduction of crosstalk).

The transfer recording medium in the present invention needs to print black, but if carbon black, which is used as a black pigment, is added to the shell, the light absorption of carbon black will increase to 30 wavelengths.
Since it covers the entire range from 0 to 600 nm, the sensitivity of the element is extremely reduced.

Therefore, in the present invention, the black hue is realized by mixing three types of pigments: yellow, cyan, and magenta. Of course, black may be achieved by mixing two types of pigments, blue, red, and green, which exhibit hues complementary to yellow, cyan, and magenta.

FIG. 1 shows the relationship between wavelength and transmittance for yellow, blue, and red pigments in order to explain the principle by which the present invention is effective in achieving high sensitivity and reducing fog. In the present invention, blue refers to cyan color commonly called phthalocyanine pigment. When three types of pigments, yellow, cyan, and magenta, are added to achieve black color, the yellow pigment in particular absorbs most of the light of 430 nm or less, resulting in a significant decrease in sensitivity. Therefore, high sensitivity can be achieved by making black color correspond to light having a wavelength of 430 to 600 nm or more. Also, for blue or cyan color, 300~
If 430nm is supported, blue absorption will be lower in the 350-430nm wavelength range, resulting in high sensitivity.If 300-430nm is also supported for red, 3
The element body (A) exhibiting red color in the wavelength range of 00 to 380 nm can be reacted.

In order to explain that in the present invention, the wavelength selectivity of elements (A) and (B) is increased, that is, it is effective in reducing the amount of crosstalk, Fig. 2 shows a fluorescent lamp (manufactured by Toshiba) with a peak wavelength of 335 nm. , FL1OA70E35/33TI5) shows the relationship between wavelength and transmittance of red, blue, and yellow pigments.

The thing that has the biggest effect on crosstalk is the emission line, which is light other than fluorescence generated by fluorescent lamps, especially at λ = 365 nm.
(i-1ine), λ=403nm (h-1in
e), and λ=436 nm (g-1ine). That is, the fluorescent lamp is turned on and the sensitive wavelength range is 300.
When attempting to react the elementary substance (A) with a wavelength of ~430 nm,
The bright line of λ = 436nm is the sensitive wavelength range 430-600n
Promote the reaction of the elementary body (B) of m. On the other hand, λ = 45
0nm (manufactured by Toshiba, FL10A70B/33T15)
If you try to make the element (B) react by lighting it, λ=3
The emission line of 65 nm and λ = 403 nm promotes the reaction of the element (A), but since there are many filters inside the shell that block short wavelength light, this can be solved by setting a filter on the lamp surface. Therefore, the sensitive wavelength range is 430-600.
If the nm element corresponds to black color and a yellow pigment is added, the influence of the three types of bright lines described above can be significantly reduced due to yellow light absorption in the range of 300 to 450 nm.

The photopolymerization initiator used in the present invention has an absorption maximum of 300 to 430 nm, benzyl, 4.4°
- diketone compounds such as -dimethoxybenzyl, 4.4°-dimethylbenzyl, and 4.4-dihydroxybenzyl, and thioxanthone such as thioxanthone, 2-chlorothioxanthone, isopropylthioxanthone, 2.4-diethylthioxanthone, and 2.4-diisobylthioxanthone Derivatives and those having an absorption maximum of 430 nm or more include 7-diethylamino-3,3°-carbonylbiscoumarin, 3.
3°-Carbonylbis(7-dinithylaminocoumarin)
A composite initiator consisting of a coumarin derivative such as and an s-triazine derivative or camphorquinone is used, but the present invention is not limited to the above-mentioned initiator.

The red pigment used in the present invention may be any red pigment used for boat fishing, but in order to achieve high sensitivity, it must be one that has weak absorption of light in the wavelength range of λ=300 to 400 nm, i.e. What is generally called vermilion is more preferable, and specific examples are C and I.

Pigment No Red 242. Red 2
2. Red 48:1. Red53:1 etc. show good characteristics.

In addition, as a blue pigment, C, 1, Pigment No.
Blue-60, Blue-15-6, Blue-15
,Blue-15-2,Blue-15-3,Blue
Phthalocyanine pigments such as -15-4 can be used.

In addition, magenta, cyan, and yellow pigments for achieving black color include C and I for magenta.

Pigment No Red 57-1. Red-
Azo lake, monoazo, and quinacridone magenta pigments such as No. 31 and Red 122 can be used, and the cyan pigment is the blue pigment mentioned above, and the yellow pigment is Yellow-1.
2, -13, -14° -17, -55, -83, -15
Disazo and benzimidacylon pigments such as No. 4 can be used.

The polymerizable compound having an ethylenically unsaturated double bond in the base bodies (A) and (B) is a compound having at least one ethylenically unsaturated double bond in its chemical structure. It has chemical forms such as , oligomer, and polymer. Examples include monomers such as methyl acrylate, methyl methacrylate, acrylonitrile, and acrylamide; unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, and maleic acid; and ethylene glycol and triethylene. Esters with aliphatic polyhydric polyol compounds such as glycol, tetraethylene glycol, trimethylolpropane, 1,3-butanediol, pentaerythritol, dipentaerythritol, and polyisocyanates (reacted with polyols as necessary) Urethane acrylates and urethane methacrylates are synthesized by the polyaddition reaction of alcohols and amines containing ethylenically unsaturated double bonds, and urethane methacrylates are synthesized by the addition reaction of epoxy resins and acrylic acid or methacrylic acid. Examples include epoxy acrylates, polyester acrylates, and spin acrylates.

In addition, polymers have a backbone of polyalkyl, polyether, polyester, polyurethane, etc. in the main chain and acrylic, methacrylic, cinnamoyl, cinnamylideneacetyl, furyl acryloyl groups, etc. in the side chain. The present invention is not limited to these examples, but the present invention is not limited thereto.

Further, an element body (A) containing the above-mentioned photopolymerization initiator and a polymerizable compound having an unsaturated double bond.

(B) may further contain known additives such as binders, UV absorbers, plasticizers, and thermal polymerization inhibitors, if necessary.

As the binder, any organic polymer can be used as long as it is compatible with monomers, oligomers, or polymers having unsaturated double bonds. Polyacrylic acid alkyl esters such as polymethyl acrylate and polyethyl acrylate, polymethacrylic acid alkyl esters such as polymethyl methacrylate and polyethyl methacrylate, or methacrylic acid copolymers, acrylic acid copolymers, and maleic acid copolymers , or chlorinated polyolefins such as chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile or copolymers thereof, as well as polyvinyl alkyl ether, polyethylene, polypropylene, polystyrene, polyamide, polyurethane, chlorinated Examples include rubber, cellulose derivatives, polyvinyl alcohol, polyvinylpyrrolidone, etc., but the present invention is not limited thereto.

These polymers may be used alone or in a mixture of two or more in an appropriate ratio. Furthermore, waxes may be used as binders, regardless of whether they are compatible or incompatible. Any amount of these polymers can be mixed into the total composition.

Next, the elementary bodies (A) and (B) consisting of the above-mentioned components have a particle size of about 3 to about 50 μm, preferably 7 to 15 μm when solid.
Physically and chemically transferred to a support as a particulate element of μm, or as a microcapsule with a particle size of about 3 to about 50 μm, preferably 7 to 15 μm, even if the elements (A) and (B) are liquid or solid. to form a recording medium. The average particle diameter of the elements (A) and (B) is preferably about 10 μm. When binding microcapsules onto a support using an adhesive, examples of the binding material include epoxy adhesive, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polyester, urethane, acrylic, urethane-acrylic, and ethylene-acetic acid. Vinyl copolymer adhesives and the like are preferably used.

Here, when the elements (A) and (B) are made into particles and supported on a support, in order to prevent damage caused by oxygen during photopolymerization,
Furthermore, it is desirable to provide an oxygen-preventing layer such as a transparent support.

Next, a specific example of an image forming method using the recording medium of the present invention will be shown based on FIG. First, the transfer recording medium 1 is stacked on the heating resistor 20 of the thermal head, and light is irradiated so as to cover the entire area of the heating section of the thermal head. The light to be irradiated is the image forming element (A).

(B) is sequentially irradiated with wavelengths that react. for example,
When the image forming elements (A) and (B) are colored either red or black, they are sequentially irradiated with light of wavelengths λ(R) and λ(BK).

That is, first, the transfer recording f'f11 a of the transfer recording medium 1
While irradiating light with wavelength λ(R) from the side, for example, heating resistors 20a and 20b of a thermal head.

20c generates heat. Then, among the image forming elements containing a red coloring material, the image forming elements to which both heat and light of wavelength λ(R) were applied (hatched areas in Figure 3a, hereinafter referred to as cured images) The forming elements are indicated by hatching.)
hardens.

Next, as shown in FIG. 3b, the transfer record ffj 1a is irradiated with light of wavelength λ (BK), and the heating resistor 20
When heat is generated in c and 20d, among the image forming elements containing the black coloring material, the image forming elements to which heat and light of wavelength λ (BK) are applied are cured. This transferred image is transferred to the transfer medium 21 in the next transfer step as shown in FIG. 3C.

In the transfer process, the transfer recording medium on which the transferred image has been formed is brought into contact with the transfer medium, and the transferred image is selectively transferred to the transfer medium by heating from the transfer recording medium or the transfer medium side to form an image. do. Therefore, the heating temperature at this time is determined so that only the transferred image is selectively transferred in the transfer step. Further, in order to perform the transfer efficiently, it is also effective to apply pressure at the same time. Pressure is particularly effective when using a transfer medium with low surface smoothness. Furthermore, if the physical property that governs the transfer characteristics is the viscosity at room temperature, transfer is possible only by applying pressure.

Furthermore, heating during the transfer process is suitable for obtaining stable, durable, and durable multicolor images.

In the embodiment described above with reference to FIGS. 3a to 3C, a method is described in which light is irradiated over the entire area of the heating resistor array 20 of the thermal head to selectively generate heat in the heating resistors of the thermal head to form an image. However, it is also possible to uniformly heat a certain part of the transfer recording medium (in the case of the thermal head shown in Fig. 3a, when all heating resistors are made to generate heat) and selectively irradiate the recording medium with light. Similarly, multicolor images can be formed. That is, light energy of a wavelength that is modulated according to the recording signal and that is selected depending on the color tone of the image forming element whose physical properties governing the transfer characteristics are desired to be changed is applied together with thermal energy.

A preferred embodiment of a recording apparatus using the recording medium of the present invention will be described with reference to FIG.

In the figure, reference numeral 1 denotes a transfer recording medium of the present invention in the form of a long sheet, which is wound into a roll and is removably incorporated into an apparatus main body M as a supply roll 2. That is, this supply roll 2 is connected to a rotatable shaft 2 provided in the device main body M.
It is removably loaded into a.

Therefore, first, the leading edge of this transfer recording medium 1 is transferred to the supply roll 2.
Transfer roller 4a and pressure roller 4b pass through guide roller 12a, thermal head 3a and guide roller 12b.
From between the peeling roller 5 and the guide rollers 12c and 12d.
The winding roller 6 is directed to the winding roll 6, and its tip is locked to the winding roll 6 by means such as a gripper (not shown). Thereafter, by rotating the transfer roller 4a while applying torque to the take-up roll 6 in the direction of arrow C using a known drive means, the transfer recording medium 1 is rotated.
is unwound in the direction of arrow a, and is sequentially wound around the circumferential surface of the winding roll 6.

Note that during the winding, a certain back tension is applied to the supply roll 2 by, for example, a hysteresis brake (not shown), and this tension and the guide rollers 12a, 12b cause the transfer recording medium 1 to move toward the thermal head 3a. It is configured to be conveyed while being pressed against the object at a certain pressure and at a certain angle.

The recording section is composed of a heating means for applying thermal energy to the recording medium 1 and a light irradiation means for applying light energy to the transfer recording medium 1 as well.

The heating means generates heat on the surface of the thermal head 3a according to the image signal, for example, with a width of 0.2 mm and a dot of 8 dots/mm.
A-4 size, line type heating resistor rows 20 are arranged, and as described above, the support lb side of the transfer recording medium 1 is applied with a predetermined pressure to the heating resistor row 20 by back tension during conveyance. It is configured to be pressed into contact. The image signal is generated from a control unit of a facsimile, an image scanner, an electronic blackboard, or the like, depending on the purpose.

On the other hand, the transfer recording layer l facing the thermal head 3a
A light irradiation means is provided on the a side. As the light irradiation means, the light emitting wavelength ranges are different from each other, and the element bodies (A) and (B
) Two types of fluorescent lamps that can react individually 3
C is installed. The two types of fluorescent lamps include, for example, a peak wavelength of 300 to 430 nm that causes the element (A) to react.
FLR16A70-BA-42/33T as a fluorescent lamp
16 (λp = 420nm: Kenko Denki), FL
10A70E31/33T15 (λp = 313 nm
: Toshiba), FLIOA70E35/33T15
(λp = 335nm: Toshiba), FL10A70
BL/33T15 (λp = 352nm + Toshiba), F
LR16R70-BA-37/33TI6 (λp =
370nm: test), FL10A70E39/33T
15 (λp = 390 nm: Toshiba), FLR16A70-8-45/33716 (λp
=450nm: Matsushita), FLIOA70B/33
T15 (λp = 450nm: Toshiba), FLIOA
70BW/33T15 (λl) = 480 nm (Toshiba), etc., one type of each may be selected in accordance with the absorption wavelength range of the photopolymerization initiator.

The present invention will be explained in more detail below with reference to Examples.

Example 1 20 g of each of the components shown in Table 1.2 were microencapsulated by the method shown below.

Method for manufacturing microcapsules Mix 100 g of water and 26 g of isobutylene-maleic anhydride copolymer (20.6%) (manufactured by Kureha Chemical Co., Ltd.),
3.1 g of pectin was added thereto and stirred for 20 minutes.

The pH was then adjusted to 4.0 with a 20% sulfuric acid solution to 0.
2 g of Quadrol (BASF) was added. While stirring this at 3000 rpm with a homomixer, a solution prepared by dissolving 20 g of the components shown in Table 1 in 30 g of chloroform was added over 10 to 15 seconds, and emulsification was continued for 10 minutes.

The emulsion was transferred to a beer force of 500 mβ and stirred with a stirring blade for 1 to 2 hours, and then the solvent was distilled off.

Next, 8.3 g of urea solution (50 wt%), 0.4 g of resorcinol dissolved in 5 g of water, 10.7 g of formalin (37%) and 0.6 g of ammonium sulfate dissolved in lomβ water were added at intervals of 2 minutes. I added it.

After the temperature was raised to 60° C. and stirring was continued for 3 hours, the temperature was lowered and the pH was adjusted to 2.0 with a 20% caustic soda solution. The capsule liquid was filtered, washed twice with 1000 mβ water, and dried.

The components shown in Table 2 were similarly made into microcapsules to produce elementary bodies (A) and (B).

Table 1 Table 2 Thermoplastic polyester (Nippon Gosei Kagaku Kogyo, Polyester-011) was diluted with toluene and applied to a thickness of 0.5 μm on a PET (polyethylene terephthalate) film (6 μm thick) using an applicator. Next, the element (A) was sprinkled onto the film and spread, and unbound particles were shaken off. The thickness of the film is 100 μm and 50 μm.
Sandwiched between PET films, temperature 110℃, pressure 2~3k
g/crr? After passing through a heat roller, the PET film was peeled off, and the element (A) was firmly adhered to the PET film to produce a transfer recording medium. Similarly, the elemental body (
A transfer recording medium was prepared by mixing equal amounts of B), and the elements (A) and (B).

The transfer recording medium consisting of the element body (A) was wound into a roll and incorporated into the apparatus shown in FIG. The thermal head used was an A-4 size line type with a width of 2 mm and 8 dots/mm, in which rows of heating elements were arranged at the edges. In addition, as a fluorescent lamp, FLR16R70-B
A-37/33T16 (λp = 370 nm: test) and FL10A70BW/33TI5 (λp = 48
0 nm: Toshiba) was used.

Next, as shown in the timing chart of FIG. 5, the lamp and thermal head were energized. In addition, when energizing the thermal head, the voltage and drive signal were controlled and the 0 energization time was changed so that the temperature of the element (A) reached approximately 100°C. When we calculated the time when no transfer occurs at all, the pulse width (defined as sensitivity) was 20 m5 for light with λp = 370 nm, λ
For light with p = 480 nm it was 250 m5.

Similarly, when the sensitivity of the recording medium made of element (B) was determined, it was 30m5, λp for light of λp = 480 nm.
= 100 m5 for light of 370 nm.

Next, when the recording medium consisting of elements (A) and (B) was energized at the timing shown in Figure 6, a good two-color image consisting of blue and black without fogging or white spots could be formed. .

Example 2 The components shown in Table 3 were microencapsulated in the same manner as in Example 1, a recording medium was produced in the same manner as in Example 1, and the sensitivity was determined. As for the fluorescent lamp, the fluorescent lamp with λp=370r+m is FLIOA70E35/33T15 (λp=3
35nm: Toshiba).

The sensitivity of the element body (A) consisting of the components in Table 3 is 30m5, and the sensitivity to fluorescent light with λp = 480nm is 260
It was m5. When the fluorescent lamp and thermal head were energized at the timing shown in FIG. 7, a good image consisting of red and black could be formed.

Example 3 The components shown in Table 1.2.3 with varying amounts of pigment added were microencapsulated in the same manner as in Example 1, and then recording media were produced.

The red capsule is FL10A70E35/33TI5 (
λp=335nm: Toshiba), blue capsule is FLR16
R70-BA-37/33T16 (λp = 370nm
: Kenshi), black capsule is FL10A70BW/33
Using a T15 (λp = 480 nm: Toshiba) fluorescent lamp, the respective sensitivities were determined and summarized in Table 4. When the amount of pigment added is less than 5%, sensitivity is good, but wavelength selectivity due to crosstalk is poor.

On the other hand, when it exceeded 50 wt%, the sensitivity decreased significantly.

(Effects of the Invention) As explained above, according to the present invention, by optimizing the combination of the photosensitive wavelength range of the element and the hue of the pigment,
It is possible to provide a two-color transfer recording medium of red and black or blue and black, which is highly sensitive, has little fog, has good wavelength selectivity, and does not easily cause white spots.

[Brief explanation of the drawing]

1 is a diagram showing the relationship between wavelength and transmittance of yellow pigments used for red, blue, and black pigments that can be used in the present invention, and Figure 2 is a diagram showing the relationship between wavelength and transmittance of red, blue, and black pigments that can be used in the present invention. Figure 3 is a diagram showing the relationship between the wavelength and transmittance of a yellow pigment used for the body, and the emission spectrum of a fluorescent lamp with an emission peak wavelength of 335r+m. 5.6.7 is a diagram showing an example of an apparatus for performing two-color recording using a recording medium according to the present invention, and FIG. 5.6.7 is a diagram showing the timing of signals applied to a fluorescent lamp and a thermal head. 1: Transfer recording medium la: Transfer recording layer 1b: Support 2: Supply roll 2a; Shaft 3a: Thermal head 3c: Fluorescent lamp 4a: Transfer roller 4b: Pressure roller 5: Peeling roller 6: Take-up roll 12a-d Ni guide roller 20: Heat generating resistor array 20a-d: Heat generating resistor 21: Transfer medium M: Main body

Claims (2)

[Claims] (1) At least two types of elements (A) in which the recording layer on the support changes transfer characteristics upon application of heat and light energy;
(B), the element body contains at least a compound having an ethylenically unsaturated double bond, a pigment, and a photopolymerization initiator, and the element body (A) absorbs the photopolymerization initiator. The maximum wavelength is 430 nm or less and the hue is red or blue, and in the element (B), the maximum absorption wavelength of the photopolymerization initiator is 430 to 600 nm.
A transfer recording medium which has a black hue and has a pigment content of 5 to 50 wt%. (2) The transfer recording medium according to claim 1, wherein the elements (A) and (B) are composed of microcapsules.