JPS6367178A - Transfer recording medium - Google Patents

Abstract

PURPOSE:To prevent degradation of image quality due to accompanied transfer of binding agent, by exposing at least a portion of image forming elements without applying binding agent for binding the image forming element to the basic material. CONSTITUTION:Binding agent having sustaining viscosity is applied onto a basic material so as to form a layer of binding material 3. Then image forming elements 1 are sprayed excessively onto said layer. Thereafter, image forming elements which are not contacting the binding material are shaken off to produce a transfer recording medium. The binding material can be provided on the basic material by applying the binding material by means of a blade or an applicator, spraying the binding material, through gravure printing, etc. Image forming elements can be arranged onto the binding material by lapping over an independently prepared supporting material arranged with binding material, carrying the basic material provided with binding material over a container containing image forming elements while contacting therewith.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a transfer recording medium that can be used in printers, copying machines, facsimile machines, and the like.

[Conventional technology]

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

One of the above-mentioned recording devices is a thermal transfer recording device. This is a method for recording on recording paper using an ink ribbon (transfer recording medium) 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 superimposed so that the thermal transfer f1 ink layer is in contact with the recording paper, and the ink ribbon and the recording paper are conveyed between a thermal head and a platen,
A thermal head applies pulsed heat according to the image signal from the support side of the ink ribbon, and the two are pressed together to transfer the melted ink onto the recording paper, thereby producing ink corresponding to the heat application on the recording paper. It is a record of images.

The above-mentioned recording apparatus has been widely used in recent years because the apparatus used is a compact J71, is noiseless, and can record on plain paper.

In addition, in recent years, image forming elements such as fine particles and microcapsules, which have different color tones or different optical densities and correspondingly different melting points or softening points, have been developed for color recording and halftone 3M. A method of recording using a transfer recording medium provided on a base material has been devised.

[Problem that the invention seeks to solve]

However, when an image is formed using such a conventional transfer recording medium, there are problems such as the occurrence of noise in the image and the formation of areas with no color.

In order to solve this problem, the invention of the tree is such that at least a part of the image forming element is covered with a binding material that binds the image forming element to the base material and is exposed on the chair. The purpose is to provide a transfer recording medium.

[Means for solving problems]

That is, the present invention provides a transfer recording medium in which an image forming element is fixed on a base material with a binder, in which at least a portion of each image forming element is exposed from the binder. It is a recording medium.

The first schematic cross-sectional view of an embodiment of the transfer recording medium of the Wood invention is shown below.
As shown in the figure.

In this figure, 1 is a microcapsule-shaped image forming element in which a core material 1a is covered with a wall material 1b;
2 is a base material, and 3 is a binding month.

In this way, in the transfer recording medium of the present invention, each image forming element is exposed without being completely covered with the binding material, so the image forming element can be transferred without any hindrance during transfer recording. The quality of the image is not degraded because the binding material is transferred together with the image.

The transfer recording medium of the present invention is manufactured, for example, as follows.

That is, first, a binding material that maintains adhesiveness is applied onto a base material to form a layer of the binding material. An excess of imaging element is then sprinkled over this layer. When the sprinkled image forming elements not in contact with the binder are brushed off, a transfer recording medium having a structure approximately as shown in FIG. 1 is obtained. As a method of providing the binding material on the base material, methods such as applying the binding material using a blade or applicator, spraying the binding material, gravure printing, etc. can be used. .

In addition, methods for placing the image forming element on the binding material include not only the simple sprinkling method, but also the method of overlaying the binding material on a separately prepared support, or placing the image forming element on the binding material in advance. A method such as contacting and conveying a base material provided with a binding material onto a container containing the material may also be used.

In the transfer recording medium of Wood's invention, the image forming element is not limited to a microcapsule-like one as shown in Figure 1, but can also be a particulate one obtained by simply clumping together a coloring material or the like without a wall material. good. In addition to the materials whose transfer characteristics change depending on the application of light and heat, there are also heat-melting wax inks similar to those used in conventional thermal transfer recording media, and resins such as toner for electrophotography. Examples include those containing as a main component. In any case, any particles that are intended to be transferred to recording paper by applying heat and pressure can be used.

Further, as the binding material, epoxy adhesive, -polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, urethane acrylic adhesive, etc. are preferably used. Further, as the base material, PET film, polyamide film, polyimide film, condenser paper, etc. can be used.

The present invention will be explained in more detail below using specific examples.

〔Example〕

A heat-sensitive transfer recording medium capable of forming a multicolor image was manufactured as follows.

<Manufacture of microcapsules> An image forming element was manufactured in the form of a microcapsule.

That is, 10 g of the core material components shown in Tables 1 and 2 were first mixed with 20 parts by weight of methylene chloride, and then a surfactant such as a cationic or nonionic surfactant having an HLB value of at least 10 and 1 g of gelatin was dissolved in water. Mix to 200ml,
8000 to 1100 using a boiler mixer under heating at 60℃
The mixture was emulsified by stirring at 00 rpm to obtain oil droplets with an average particle size of 26 mm.

Table 1 Table 2 Stirring was continued at 60 DEG C. for 30 minutes, and methylene chloride was distilled off to reduce the average particle size to approximately 0 .mu.m. Add 20 ml of water in which 1 g of gum arabic was dissolved, cool slowly, and then add N114 ammonia water to make the pH 1 or higher to obtain a microcapsule slurry. 0
~I was added slowly to harden the gelatin and gum arabic capsule wall.

After that, solid-liquid separation was performed using a Nutsche waver.
A microcapsule image-forming element was obtained by drying it at 35° C. for 10 hours in a drying machine. This image forming element is π
The core materials in Tables 51 and 2 are microcapsules covered with a wall material, the particle size is 7 to 15 μm, and the average particle size is 10 μm.
It was a door.

The core materials used here shown in Tables 1 and 2 have the property of forming an image when exposed to thermal energy and light energy. Immediately, a reaction is initiated by the application of thermal energy and light energy, and the physical properties governing the transfer characteristics change. In other words, the transfer temperature of the image forming element in which the reaction has progressed is higher than that of the 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 and absorbs light in the band around the peak of curve A in the absorption characteristic graph shown in Figure 3, it generates radicals. It initiates a reaction and polymerizes, and due to this reaction, the transfer temperature of the core moon increases from 60 to 70°C to 150°C or higher. When this core is transferred to form an image, it exhibits a magenta color. 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. This reaction causes the transfer temperature of the core to rise from 80 to 70°C to 150°C. This core material exhibits a blue color when transferred to form an image.

<Manufacture of a transfer recording medium according to the present invention> On a base layer which is an ET film with a thickness of 6 mm and a width of 70 mm, a layer of 71 months is dried using an applicator with a gap set at 0.5 to 1 mil. Later thickness: 0.5~1
It was applied to a thickness of 0 μm and dried for 10 seconds with a hair dryer. After drying, a layer of the binder which remains sticky and has low fluidity is coated with an excess of microcapsules of 1-2 divine species uniformly combined with Ji2 at a ratio of 1:1. The image forming element not in contact with the sprinkling and binding material was brushed off. Thereafter, the transfer recording medium of the present invention was obtained by drying it by blowing air at room temperature for 2 to 3 minutes. When this transfer recording medium was observed under a microscope, the upper surfaces of the microcapsules that would come into contact with the recording paper were not covered with the binding material.

The binder used here had a polymerization degree of about 140 tl,
Mainly made of PVA (polyvinyl alcohol) with a saponification degree of about 95!
It was a 1% Iw aqueous solution, and in order to improve wetting to PUT, 11 ionic surfactant; coconut oil fatty acid jetanolamide was added in an amount of 0.1.

<Experimental example> Using the writing medium obtained by the above method,
A transcription experiment was conducted as described below.

That is, the PE7 side of the transfer recording medium is brought into close contact with a hot plate heated to 120°C, and about 2 degrees below the transfer recording layer surface.
5 mm 1 l apart, IOW fluorescent lamps manufactured by Toshiba Corporation, each having a spectral characteristic with a peak wavelength of 313.390 nm as shown by C and D in Fig. 4, were placed at desired positions over a period of approximately 50 m5 ec. Irradiated.

The transfer recording medium after heating and irradiation was passed between two rollers that were superimposed on the recording paper and pressed against each other so that the transfer recording layer of the transfer recording medium was in contact with the recording paper whose surface smoothness was about 300 seconds. The pressure between the rollers is set to about 25 kg/m2,
In addition, the surface temperature of the roller in contact with the transfer recording medium is set to 9.
It was heated to 0 to 100°C. After passing between rollers, when the transfer recording medium and the recording paper were separated, a high quality image of blue and magenta colors was obtained on the recording paper.

<Comparative Example> The microcapsules were added to 20 g of a solution prepared by adding 6 parts of a nonionic surfactant and coconut oil fatty acid jetanolamine to 100 parts of a 2 wt'J aqueous solution to PV as in the example. 8 g of a homogeneous mixture of 1 is applied onto a 1)riT film substrate with a thickness of 6 and an rl of 170 mm using an applicator with a gap of 1 mi I, and a dryer is used to apply the dispersion of 8 g. It was dried in about seconds to obtain a transfer recording medium. In this transfer recording medium, the microcapsules were coated on the PET film in an almost single-layer close-packed state, but when observed with an optical microscope and an electron microscope, it was found that the capsules were covered with a thin layer of PVA. . This situation is shown in FIG.

When a transfer experiment similar to that in Example was conducted using this transfer recording medium, only 13 images were obtained that were blurred and the image quality was so poor that the colors could not be faithfully reproduced.

〔Effect of the invention〕

As explained above, the transfer recording medium of the present invention has −1;Ij
Since there is no binding bond on the upper surface of the image forming element on the material, a good transferred image with high image quality can be obtained. can be done.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a schematic sectional view of a transfer recording medium of the present invention, FIG. 2 is a schematic sectional view of a conventional transfer recording medium, and FIG. 3 is a schematic sectional view of a transfer recording medium of the present invention. FIG. 4 is a graph showing the absorption characteristics of the agent, and FIG. 4 is a graph showing the spectral characteristics of a fluorescent lamp. Microcapsule (image forming element) 1a: Core material 1b: Wall material 2: Base material 3: Binder A, B: Absorption characteristics C, D + spectral characteristics of core material

Claims (1)

[Claims] A transfer recording medium comprising an image forming element fixed on a base material with a binder, wherein at least a portion of each image forming element is exposed from the binder. recoding media.