JPH0211391A - Production of recording medium - Google Patents

Abstract

PURPOSE:To ensure uniform arrangement of image-forming elements and enable an excellent image-forming medium to be obtained by incorporating and antistatic agent into a binder constituting a binder layer for binding the elements and a base to each other. CONSTITUTION:For example, a binder prepared by adding an ethanol solution of quaternary ammonium chloride as an antistatic agent to a toluene solution of a polyester adhesive (Polyester) is applied to a base comprising a PET film by an applicator, and the solvents are removed by drying. The binder has a glass transition point of -15 deg.C, and retains a subtle tack even at room temperature. Next, a plurality of kinds of microcapsule-shaped image-forming elements are mixed with each other, and the mixture is scattered on the binder layer, followed by clearing away surplus ones of the image-forming elements, whereby the image-froming elements are arranged on the binder layer in a proportion of about 80%. Thereafter, the elements are firmly fixed on the base by applying pressure and heat thereto, thereby obtaining a transfer recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a recording medium used in a recording device that can be used in a printer, a copier, a facsimile, or the like.

[Background Art 1] In recent years, with the rapid development of the information industry, various information processing systems have been developed, and recording devices suitable for each information processing system have also been developed.

One of the above-mentioned recording devices is a thermal transfer recording device. In this method, recording is performed on a recording paper using an ink ribbon made by coating a ribbon-shaped support with a heat-melt ink made by dispersing a colorant in a heat-melt binder.

That is, the ink ribbons are stacked so that their heat-melting ink layers are in contact with the recording paper, and the ink ribbon and the recording paper are conveyed between a thermal head and a platen, and the ink ribbon is transferred from the support side of the ink ribbon to the thermal head. By applying pulse-shaped heat according to the image signal and pressing the two together and transferring the molten ink to the recording paper, an ink image corresponding to the heat application is recorded on the recording paper. .

The above recording apparatus has been widely used in recent years because it is small and lightweight, makes no noise, and can record on plain paper.

However, conventional thermal transfer recording devices are not without problems.

The reason is that in conventional thermal transfer recording devices, the transfer recording performance, that is, the image quality, is greatly affected by the surface smoothness of the recording paper.
Although good image recording is performed on recording paper with high smoothness, there is a possibility that the quality of image recording will deteriorate when recording paper with low smoothness is used.

Furthermore, when attempting to obtain a multicolor image with a conventional thermal transfer recording device, it is necessary to repeat transfer to overlap the colors. For this purpose, it is necessary to install multiple thermal heads, or to make complicated movements such as stopping and reversing the recording paper, which not only makes color misalignment unavoidable, but also makes the entire device large and complicated. There were problems such as slowdown.

Therefore, in recent years, in order to obtain color recording and halftone recording, recording media in which fine particles, microcapsules, etc., which have different color tones or different optical densities and correspondingly different melting points or softening points are provided on a base material have been used. A method has been devised to record information using

For example, in (A) U.S. Pat. No. 4.399.209:
An image forming method that applies photopolymerization to colorization is described. This method uses a recording layer in which microcapsules made of a photocurable material that reacts with the coloring layer to produce the three primary colors of yellow, magenta, and cyan and have wavelength selectivity are randomly provided on the coloring layer coated on the base paper. A medium is used to sequentially perform positive image exposure corresponding to the three primary colors, and after the exposure, the recording medium is pressurized to destroy the uncured microcapsules and cause them to react with the color-forming layer to develop a multicolor color. It is used to obtain images.

Also, (B) U.S. Pat. No. 4,416,966 discloses a 5elf-Contained imaging system in which the color developer is on the same support surface as the photosensitive microcapsules. After being exposed to mainly ultraviolet light that is exchanged according to the recorded image, the microcapsules are destroyed by passing the image forming sheet through a pressure roll.
Releases the internal phase image-wise. The color former is then transferred to a developer, usually provided in a separate layer, where it reacts to form a multicolor image.

On the other hand, in order to improve the problem of the above-mentioned (A) and (B) that the density of the recorded image becomes non-uniform due to the degree of discharge of the inclusions when the microcapsule is destroyed, C) When light energy and thermal energy are applied to a photothermally sensitive material in response to an image signal, the reaction of the material rapidly progresses and the transfer characteristics irreversibly change, resulting in a change in response to the image signal. He invented an image forming method and a transfer recording medium for forming an image based on the difference in characteristics and transferring it to a recording medium, and has already filed a patent application (Patent Application No. 6O-150597).
.

Image formation using transfer recording media such as (A), (B), and (C) above involves arranging an image forming element on a base material,
This is done by transferring it to a transfer medium by some means. Taking (C) as an example, the image forming process will be described in more detail as a supplementary explanation of the present invention, which will be described later.

FIG. 2 is a diagram showing an example of the process of forming an image on a recording medium 1, in which thermal energy modulated according to a recording signal is applied together with light energy of a wavelength selected depending on the color tone of the image forming element to be cured. This is an image forming process.

The recording medium 1 is stacked on the thermal head 20 and light is irradiated so as to cover the entire heat generating part of the thermal head 20. The irradiation light is sequentially irradiated with wavelengths that the image forming element reacts to.For example, the image forming element exhibits a color tone of yellow (Y), magenta (M), or cyan (C). In this case, light with wavelengths λ1, λ2, and λ3 is sequentially irradiated. That is, first, the image forming elements 1c and ld of the recording medium 1 are
, while emitting light with a wavelength λl from the le side, for example, heating resistors 20b and 20d of the thermal head 20.
, 20e generates heat. Then, of the image forming element 1c that exhibits yellow color, the image forming element to which both heat and light of wavelength λ1 have been applied (the hatched part in FIG. 2(a), hereinafter referred to as the cured image forming element) (indicated by hatching) hardens. Next, as shown in FIG. 2(b), the image forming elements 1c, ld, and le are irradiated with light of wavelength λ2, and the heating resistors 20a, 20e, and 20f are
An image forming element 1d that exhibits a magenta color when heated.
Of these, the image-forming oxygen body to which both heat and light of wavelength λ2 are applied is cured. Further, as shown in FIG. 2(C), when the image forming elements 1c, ld, and le are irradiated with light of wavelength λ3 and the heating resistors 20a, 20b, and 20e are made to generate heat, an image is formed that exhibits a cyan color. Of the element bodies 1e, the image forming element to which both the heat and the light of wavelength λ3 are applied is cured. (Thermal energy and light energy may be applied in any manner.) This transferred image is transferred to the object to be transferred 2 in the next transfer step as shown in FIG. 2(d).

That is, in the transfer process, the recording medium l on which the transferred image has been recorded is brought into contact with the transfer target 2, and heated and/or heated so that only the transferred image is selectively transferred from the recording medium 1 or the transfer target 2 side. Alternatively, an image is formed by selectively transferring a transfer image consisting of a portion that can be transferred by applying pressure to the transfer target 2. (Actually, some of the elements transferred to the object to be transferred are subject to deformation.) In cases (A) and (B), the elements are destroyed and are not transferred themselves, so the Although the transfer process in FIG. 2(d) is completely different, the placement of the element on the base material is the same.

As explained above, in the transfer recording medium using minute image forming elements such as microcapsules such as (A), (B), and (C), minute particles are made of PET (polyethylene terephthalate) during their manufacture. must be homogeneously arranged in almost a single layer on the film,
Particularly in the case of a color recording or halftone recording medium that uses a plurality of different types of image forming elements, a good image cannot be obtained unless they are uniformly arranged without being biased toward each other.

In particular, in the case of (C), it is necessary to transfer each particle independently, and it is not desirable for the binder to cover the entire surface of the element or to be filled between the elements.

For the above reasons, etc., the method for manufacturing (A), (B), (C), etc. is the so-called dry method, in which the element is placed dry on a binder coated on a film in advance and bound. Coating method is suitable.

[Problems to be Solved by the Invention] However, in many cases, these image forming elements are insulators, and in the case of particles with a diameter of several μm to several tens of μm,
With conventional dry coating methods, it is often difficult to achieve uniform alignment due to electrostatic interactions. In particular, when a mixture of different types of image forming elements is arranged side by side, the charging characteristics differ depending on the type, so especially when manufacturing in a low humidity environment, many elements of the same type tend to gather together, resulting in large unevenness. .

Conventionally, in order to prevent such unevenness, methods have been adopted, such as creating an artificially humid environment and manufacturing in that environment, or adding a charge control agent to the image forming element depending on its characteristics. However, these modifiers are expensive and have problems in that it is very difficult to adjust the charging characteristics.

As described above, the present invention eliminates the uneven arrangement of image forming elements that occurs when a plurality of types of fine particle image forming elements having different charging characteristics are produced by a dry coating method, thereby producing an excellent image forming medium. The present invention provides a method.

[Means for Solving the Problems] Therefore, the present inventor solved the above problems by incorporating an antistatic agent into the binding material constituting the binding layer that binds the image forming element and the base material. Settled. That is, a binder for binding a mixture of multiple types of image forming elements such as microcapsules is thinly applied onto a film serving as a base material such as PET, and then a mixture of the multiple types of image forming elements such as microcapsules is applied. The mixture is attached to the binder by the method described later, and by adding an antistatic agent to the binder during adjustment, the mixture on the image forming element can be made homogeneous without becoming uneven. This makes it possible to arrange them on a base material.

The idea of reducing the effects of static electricity by using an antistatic agent is well known, and as described in the prior art, it is known to add a charge adjusting agent to the image forming element itself, but it is also known that the effect of static electricity can be reduced by adjusting the charging characteristics. is difficult.

As a result of extensive research, the present inventor has discovered that by pre-containing an appropriate amount of an antistatic agent layer in a binder, the base material can be uniformly and homogeneously bound onto the base material, regardless of the charging characteristics of the base material. I discovered what I could do. The appropriate amount depends on the size, shape,
Although it varies depending on the charging characteristics and the type of antistatic agent, the amount is such that the antistatic effect is exhibited and the binding power of the binder is not lost, and it is generally about 0.1 to 10% based on the weight of the binder. can be done.

As a method for incorporating an antistatic agent into the binding material, an antistatic agent is added when preparing the binding material to be applied to the base material, and -
The antistatic agent may be mixed together with the antistatic agent, or an antistatic agent dissolved in a solvent may be added and mixed in the same manner. The resulting antistatic agent-containing binder can be used in exactly the same manner as a normal binder. In other words, a recording medium can be manufactured by coating a base material with an applicator or the like and forming an image forming element thereon, and this method has a lower cost compared to applying an antistatic agent in a separate process. Therefore, the antistatic agent can be uniformly and stably supplied to the entire sheet.

According to the method of the present invention using the antistatic agent-containing binder, the image forming element is almost not affected by static electricity when it is formed on the base material, so blocking and uneven mixing are less likely to occur and it is easier to form the image forming element on the base material. The element can be formed as a uniform single layer on the base material, and can be uniformly arranged on the base material, so that a high quality image can be obtained.

This means that even if the amount of charge differs due to differences in the charging characteristics of each image forming element, most of the charge is released when it comes into contact with a binding layer containing an appropriate amount of antistatic agent. This is thought to be because the result is almost equivalent to a mixture of neutral particles.

Note that the plural types of image forming elements refer to image forming elements having different transfer characteristics and colors, and can be used for color recording and the like.

FIG. 1 shows how the image forming element is bound to the antistatic agent-containing binding layer. In this case, the image forming elements 1c, l
d and le are yellow (Y) and magenta (M), respectively.
, contains cyan (C) coloring components.

The antistatic agent according to the present invention is a plastic.

Fiber 9 A chemical that is added or applied to paper to prevent damage caused by the generation of static electricity.It is a surfactant-based or conductive resin-based material, but it does not affect the binding force of the binding material. It is preferable to use one that does not affect the binding material and can be dissolved in the same solvent as the binder. Specifically, nonionic surfactants such as polyoxyethylene alkylamine, polyoxyethylene alkylamide, polyoxyethylene alkyl ether, glycerin fatty acid ester, sorbitan fatty acid ester, alkyl sulfonate, alkylbenzene sulfonate, alkyl sulfate, and alkyl phosphate. Anionic surfactants such as quaternary ammonium chloride, quaternary ammonium sulfate, cationic surfactants such as quaternary ammonium nitrate, amphoteric surfactants such as alkyl betaine type, alkylimidacilline type, alkylalanine type etc. Examples include surfactants and conductive resins such as polyvinylbenzyl cations and polyacrylic acid cations, which can be used singly or in combination.

Hereinafter, a method for manufacturing a recording medium using an image forming element using a binder containing an antistatic agent will be described in more detail.

First, an antistatic agent is added to a binder by a method depending on the method for preparing the binder itself to prepare a binder containing an antistatic agent having a uniform composition. In other words, in the case of a binder whose main component is a thermoplastic material, it is used by dissolving it in a solvent or forming an emulsion, so the antistatic agent can also be dissolved in advance in a solvent or water or added as is. Furthermore, when using a thermosetting binder, there are two types: one dissolved in a solvent, one without a solvent, or an emulsion type. In this case as well, an antistatic agent can be added as in the former case.

Furthermore, when using a water-soluble resin binder, it may be dissolved in an aqueous solvent or added as is.

As a binder, in addition to thermoplastic materials such as polyester, ethylene-vinyl acetate copolymer, polyamide, polyolefin, polyurethane, polychloroprene, nitrile rubber, and styrene-butadiene, epoxy, Thermosetting adhesives such as urethane-acrylic adhesives, water-soluble resins such as polyvinyl alcohol, polyvinylpyrrolidone, and polyacrylamide, and other adhesives are preferably used.

The antistatic agent is added to these binders in an amount of approximately 0.1 to 10% based on the weight of the binder, although it varies depending on the type, and is used as a material for the binder layer.

Next, a binder containing the antistatic agent is applied onto the base material using an applicator, a wire bar, or the like, or is formed by spraying, gravure printing, or the like.

As the base material, a relatively heat-resistant plastic film such as polyester, polycarbonate, triacetylcellulose, nylon, or polyimide, or paper such as condenser paper or glassine paper is used.

When forming a binder on a base material, if the binder is mainly composed of the above-mentioned thermoplastic material, it can be dissolved in a solvent or made into an emulsion, and after being applied with an applicator, the solvent or water should be removed. It can be obtained by volatilization, or by melting the material on a hot plate, applying it with a wire bar, and allowing it to cool to room temperature. Since a certain degree of tackiness is required when bonding the image forming element, adhesiveness can be produced by heating again.

In addition, when using the thermosetting binder, there are two types: one dissolved in a solvent, one without a solvent, or an emulsion type. A binding layer can be created by volatilizing the solvent or water. In this case, the tack is maximum immediately after coating and loses over time, so the image forming element has maximum tack immediately after coating with the binder and loses over time, so the image forming element It is necessary to attach it immediately after applying the binder.

When using a water-soluble resin, a binding layer is obtained by applying an aqueous resin solution onto the substrate using an applicator and evaporating the water, but when it is completely dry, there is no tack. Therefore, when coating the image forming element, it is necessary to generate tack by leaving it in a semi-dry state or by supplying moisture later by spraying water vapor or the like.

Next, the image-forming element is adhered in a single layer onto a tacked antistatic agent-containing binder, not only by sprinkling, but also by overlaying the binder on a separately prepared support. Alternatively, a method may be used in which a base material coated with a binder is conveyed in contact with a container containing an image forming element in advance. This is carried out by providing means for removing the excess amount, if necessary.

An image can be formed on the recording medium thus obtained according to the transfer method of the recording medium. In particular, the manufacturing method described above is effective for manufacturing a recording medium in which the image forming element is directly transferred onto the recording medium without destroying it.

In other words, in the case where an image is formed by destroying the element body and leaching out the contents, slight non-uniformity of the element will not become obvious, but in the case of the element body being transferred, the non-uniformity of the element will remain as it is. This appears as non-uniformity, so it is especially important to
This is because homogenization is important.

An example of an image forming element to be transferred is a photothermally sensitive material that the applicant has already applied for, which reacts rapidly when light energy and thermal energy are applied in accordance with an image signal. Progressively, transcriptional properties change irreversibly,
Examples include an image forming method and a transfer recording medium in which an image is formed based on the difference in characteristics according to an image signal and is transferred to a recording medium.

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

In addition, although an example of a microcapsule with a diameter of about 10 μm is given in the following example, it is not necessarily limited to a microcapsule, and it is desired to uniformly arrange a particulate element having a property of several tens of μm or less on a substrate. It is applicable in all cases.

Furthermore, regarding the function of the image forming element, although the transfer characteristics change only when light and heat are applied simultaneously, this is not necessarily the case, and all principles that can be applied to recording are explained. It is also applicable.

[Examples] Example 1 [Manufacture of image forming elements] Two types of image forming elements were manufactured in the form of microcapsules. That is, 10 g of each of the core material components shown in Tables 1 and 2 were first mixed with 20 parts by weight of methylene chloride, and a surfactant having an HLB value of at least 10, such as a cationic or nonionic surfactant, and gelatin Ig. water dissolved in 20
0+nj2, emulsified by stirring at 8.000 to 10.000 rpm with a homomixer under heating at 60°C,
Oil droplets with an average particle size of 26 μm were obtained and further stirred at 60°C for 3
The methylene chloride was distilled off to give an average particle size of about 10 μm. Add 20+y+12 water in which 1g of gum arabic has been dissolved, cool slowly, and then add NH
A microcapsule slurry was obtained by adding .01 ((ammonia) water to make pi (11 or higher), and 1.0 mj2 of a 20% glutaraldehyde aqueous solution was slowly added to harden the capsule walls.

After that, solid-liquid separation was carried out using a Nutsche filter, and 35
C. for 10 hours to obtain two types of image forming elements in the form of microcapsules. The image forming elements each have a first
The core materials shown in Tables 1 and 2 were microcapsules covered with a shell material, and were formed to have a particle size of 7 to 15 μm and a number average particle size of 10 μm.

The core materials used here shown in Tables 1 and 2 had the property of forming images and tending when thermal energy and light energy were applied. That is, curing started by applying thermal energy and light energy, and the transfer conditions for the recording medium changed. In other words, the transfer start temperature of an image forming element in which the reaction has progressed is higher than that of an image forming element in which the reaction has not progressed. Specifically, when the photoinitiator in the core material shown in Table 1 is heated to 100°C or higher, it absorbs light in the band around the peak of curve A in the absorption characteristic graph shown in Figure 3. It started a radical reaction and polymerized. As a result of this reaction, the transfer initiation temperature of the core material was 60 to 70°C.
The temperature rises above ℃. Note that this image forming element exhibits a magenta color when transferred to form an image.

On the other hand, when the photoinitiator in the core material shown in Table 2 is heated to 100°C or higher and absorbs light in the band around the peak of curve B in the absorption characteristic graph shown in Figure 3, it undergoes a radical reaction. The transfer initiation temperature of the core material is 60-70℃, but it is now 150℃.
rise above. Note that this image forming element exhibits a blue color when an image is formed by transfer.

Table 1 Table 2 [Manufacture of recording medium] Nippon Gosei Chemical Co., Ltd. type polyester adhesive Polyester-LP-022 (solid content 50%) LCC to toluene 3
A binder prepared by adding 1 part of a 10% ethanol solution of quaternary ammonium chloride as an antistatic agent to 100% of the weight of polyester was added to the solution at a ratio of cc to a thickness of 6.
It was coated onto a support made of μm PET film using an applicator. Thereafter, the solvent was removed by drying, and the thickness was measured and found to be approximately 1 μm. Since this binder has a glass transition point of 115° C., a slight tack remained even at room temperature to the extent that the image forming element formed as described above could be easily attached to the support.

Next, a microcapsule-shaped image forming element using the core material as shown in Tables 1 and 2 obtained as above was prepared.
1 of the mixture and sprinkled it on to adhere. Thereafter, when the excess image forming element was brushed off, it was found that the image forming element was arranged in approximately one layer and at a ratio of 80% on the binding layer.

Thereafter, the image forming element was firmly fixed on the support by applying a pressure of about 1 kg/cm2 and heat of about 80° C. to form a transfer recording medium.

Using the recording medium obtained by the above method, the following transfer experiment was conducted. The experimental environment at this time was a room temperature of 26° C. and a humidity of 15%.

That is, the PET surface of the transfer recording medium is brought into close contact with a hot plate heated to 120° C., and approximately 2
Toshiba ■ has spectral characteristics with peak wavelengths of 313.390 nm as shown by C and D in Figure 4 when viewed from a distance of 5 mm.
Each desired position was irradiated with an IOW fluorescent lamp manufactured by Manufacturer Co., Ltd. for a period of approximately 50 m5 ec. After heating and irradiating the recording medium, the image forming element side of the recording medium has a surface smoothness of about 300.
The paper was overlapped with the recording paper so that it was in contact with the second recording paper, and passed between two rollers pressed against each other. The pressure between the rollers was set at approximately 25 kgf/cm'', and the surface temperature of the roller in contact with the recording medium was preheated to 90 to 100°C. After passing between the rollers, the recording medium and recording When the paper was peeled off, a high-quality, homogeneous image with little unevenness was obtained on the recording paper in blue and magenta colors.

Comparative Example In Example 1, an antistatic agent was added to the binding layer, but
For comparison, a series of experiments were conducted without the addition of antistatic agent. As a result, the image forming element is sprinkled on the binding material,
Even at the stage where the excess amount was removed, noticeable unevenness was already observed with the naked eye. When this recording medium was heated and irradiated under the same conditions as in Example 1 and transferred, it was observed that the same unevenness was transferred to the transferred image.

Example 2 As a binder, emulsion type adhesive bond CE500) 1 manufactured by Conicy was mixed with distilled water to reduce the non-volatile content to 15 wt%.
To which polyoxyethylene alkylamide was added as an antistatic agent in an amount of 2 wt % based on the non-volatile content was used. This binding material was applied onto a support made of a PET film having a thickness of 6 μm using an applicator. After that, when the moisture was removed by drying and the thickness was measured, it was approximately 2.
It was μm.

Next, a mixture of two types of microcapsules produced in the same manner as in Example 1 at a ratio of 1:1 is sprinkled onto the binding layer, and the image forming element not in contact with the binding material is brushed away. Then, a recording medium was obtained by applying a pressure of about 1 kg/cm'' using a roller.

Example 1 Using the recording medium obtained by the above method,
A similar transcription experiment was conducted. Note that the experimental environment at this time was also a room temperature of 26° C. and a humidity of 20%. As a result, a high-quality, homogeneous image with little unevenness was obtained on the recording paper, consisting of blue and magenta colors.

Comparative Example As a comparative example to Example 2, a series of experiments were conducted without adding an antistatic agent. As a result, when the image forming element was sprinkled onto the binder and the excess amount was removed, noticeable unevenness was already observed with the naked eye. When this recording medium was heated and irradiated under the same conditions as in Example 1 and transferred, it was observed that the same unevenness was transferred to the transferred image.

Example 3 Two types of microcapsules were obtained in the same manner as in Example 1 from 10 g of each of the core material components shown in Tables 3 and 4. These two types of microcapsules both had a particle size of 7 to 15 μm and a number average particle size of 10 μm.

The core materials shown in Tables 3 and 4 used here also had the property of forming images when energy and light energy were applied thereto.

Table 3 Table 4 Specifically, the photoinitiator in the core material shown in Table 3 is 100%
When it absorbs light in the band around the peak of curve E in the absorption characteristic graph shown in Figure 5 while being heated above ℃, a radical reaction starts and polymerization occurs, and this reaction increases the transfer temperature of the core material. What used to be 60-70℃ is now 150℃
rise above. This core material exhibits a magenta color when transferred to form an image. On the other hand, when the photoinitiator in the core material shown in Table 4 is heated to 100°C or higher and absorbs light in the band around the peak of curve F in the absorption characteristic graph shown in Figure 5, it starts a radical reaction. The reaction causes the transfer temperature of the core material to rise from 60 to 70°C to 150°C or higher. This core material exhibits a blue color when transferred to form an image.

Using the apparatus shown in Figure 6, as follows, a thickness of 6 μm was obtained.
A recording medium was manufactured by bonding the above microcapsules onto a base material which was a PET film having a width of 80 mm and a width of 80 mm.

First, the base material 1a is rolled at a constant speed of 1 m by the base material roll 11.
/min, the binder 1b was applied onto the base material 1a from the binder coating container 12 using the supply blade 4 so that the layer thickness was approximately 0.3 μm after drying. . All of the following steps were carried out in accordance with this constant rate of substrate delivery.

The binder used here is a two-component epoxy adhesive from Kanebo N.C., and Evolution E
A mixture of AI and Evolution EBI in a ratio of 1:1 and 1% (solid content ratio) of polyoxyethylene alkyl ether as an antistatic agent was used. This binding material did not lose its adhesive properties for several hours even when left at room temperature.

Next, on this adhesive binder layer, two types of image forming elements in the form of microcapsules formed using the core material components shown in Tables 3 and 4 above are placed in a mixer 8. 1
A fixed amount (5 g/m1n) of LC was uniformly mixed at a concentration of 1.5 g/ml and sprinkled from hopper 5.

Next, the base material 1a is placed on the rotating drum 6 with the surface on which the image forming element is not placed facing inside and rotated half a turn so that the surface on which the image forming element is placed is facing downward. I made it. In this process, when the substrate 1a rotated about % along the rotating drum, the image forming element not in contact with the binder fell and was collected in a collection container.

Next, the substrate 1a on which the image forming element was placed was passed through a drying oven 9 maintained at 100° C. for 15 minutes to dry the binder to a desired degree, thereby obtaining a recording medium. This recording medium was wound up on a recording medium collection roll 10.

Using the recording medium obtained by the above method, the following transfer experiment was conducted. The experimental environment at this time was a room temperature of 26° C. and a humidity of 15%.

That is, the PET surface of the transfer recording medium is brought into close contact with a hot plate heated to 120° C., and approximately 2
From a distance of 5 mm, two types of lOW fluorescent lamps manufactured by Toshiba ■ with spectral characteristics with peak wavelengths of 313.390 nm as shown by C and D in Figure 4 were exposed at approximately 50 m5ec.
Each desired position was irradiated over a period of time. The recording medium after heating and irradiation was passed between two rollers that were pressed against each other and overlapped with a recording paper so that the image forming element side of the recording medium was in contact with a recording paper whose surface smoothness was about 300 seconds. The pressure between the rollers is set to approximately 25 kg/cm, and the surface temperature of the rollers in contact with the recording medium is set to 90 to 10 kg/cm.
It was heated to 0°C. After passing between the rollers, when the recording medium and the recording paper were peeled off, there was a trace on the recording paper.
A homogeneous, high-quality image with little unevenness consisting of blue and magenta colors was obtained.

COMPARATIVE EXAMPLE As a comparative example to Example 3, a series of experiments were conducted without the addition of antistatic agent. As a result, when the image forming element was sprinkled onto the binder and the excess amount was removed, noticeable unevenness was already observed with the naked eye. When this recording medium was heated and irradiated under the same conditions as in Example 3 and transferred, it was observed that the same unevenness was transferred to the transferred image.

[Effects of the Invention] As explained above, when producing a transfer recording medium using a dry coating method, by incorporating an appropriate amount of antistatic agent on the binding layer so as not to lose the surface tack, unevenness can be reduced. It is possible to produce fewer homogeneous recording media.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a recording medium manufactured by the method of the present invention, and FIG. 2 shows transfer recording according to the present invention (a) and (b).
, (c). Figure 3 showing the image forming process performed in the order of (d).
The figure shows the absorption spectrum of the image forming element used in Examples 1 and 2. Figure 4 shows the emission spectrum of the image forming light source used in Examples 1 to 3. A diagram showing the absorption spectrum of the image forming element used in Example 3. FIG. 6 is a schematic cross-sectional view of the medium manufacturing apparatus used in Example 3. 1 is a recording medium, Ia is a base material, 1b is a binding material, Ic, ld, and le are image forming elements, 2 is a transferred body, 4 is a blade, 5 is a hopper, 6 is a rotating drum, 7 is a collection container, 8 is a mixer 9 is a dryer, IO is a collection roll, 11 is a supply roll, 12 is a binder supply container, 20 is a thermal head, and 20a to 20f are heating elements. Patent applicant Canon Co., Ltd.

Claims (2)

[Claims] (1) In a method of coating a plurality of types of fine particulate image forming elements having different chargeability on a base material, an antistatic agent is added to a binding layer that binds the base material and the image forming element. 1. A method for manufacturing a recording medium, characterized in that the method is carried out by containing the medium in advance. (2) The method for manufacturing a recording medium according to claim 1, wherein the image forming element is a mixture of a plurality of types of image forming elements to be transferred to the transfer medium.