JPS6342890A - Thermal transfer material - Google Patents

Abstract

PURPOSE:To make it possible to perform beautiful printing with favorable color separation on an ordinary paper through a simple method, by setting the adhesive force between two ink layers provided on a base and the adhesive force between the ink layer and the base in respectively specified inequality relationships at two specified temperatures. CONSTITUTION:A thermal transfer material 1 comprises a first ink layer 3 and a second ink layer 4 sequentially provided on a base 2. In the thermal transfer material, the inequality relationship of the adhesive force (F2) between the first ink layer 3 and the second ink layer 4 with the adhesive force (F1) between the first ink layer 3 and the base 2 is F1 > F2 at 90 deg.C, and is F1 < F2 at 40 deg.C. A recording material consisting of an ordinary paper and the thermal transfer material 1 are laid one upon the other so that the second ink layer 4 makes contact with the recording material, and heat is applied patternwise to the transfer material 1 by a thermal head from the side of the base 2. When the period of time between the application of heat and the release of the recording material from the thermal transfer material is varied, beautiful two-color printing can be performed on the ordinary paper or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION 1-1j The present invention relates to a two-color thermal transfer material for transferring two-color recorded images onto a recording medium made of plain paper or the like.

11. In addition to the general characteristics of thermal recording methods, such as the device used is lightweight, compact, noiseless, and has excellent operability and maintainability, the thermal transfer recording method does not require single-color processed paper; In addition, it has the feature of excellent durability of recorded images, and has been widely used recently.

This thermal transfer recording method generally uses a thermal transfer material formed by coating a sheet-like support with a thermal transferable ink made of a heat-melting binder and a colorant dispersed therein. The recording material is placed on the recording material so that the ink layer is in contact with the recording material, and heat is supplied from the support side of the thermal transfer material by a thermal head to transfer the melted ink layer onto the recording material. A transfer mark Q image is formed on the body according to the shape of heat supply.

Furthermore, there is a strong market demand for two-color printing while taking advantage of the advantages of the thermal transfer recording method, and various techniques for obtaining two-color printing have been proposed.

Conventionally, as a method for printing in two colors on plain paper using a thermal transfer recording method, Japanese Patent Application Laid-Open No. 148591/1983 describes two heat-melting high melting point inks containing different colorants. Layer A and low melting point ink layer B are sequentially laminated from the base material side, and in the case of low heat application energy, only the low melting point ink layer B is transferred onto the plain paper, and in the case of high heat application energy, the heat melting ink layer A is transferred onto the plain paper. A two-color thermal transfer recording element has been disclosed which provides a two-color recorded image by transferring both of the two colors.

Furthermore, in JP-A No. 59-64389, Omurakami discloses a two-color thermal transfer ink provided with an ink layer consisting of an ink that melts and leaches when heated, and an ink that melts and peels off at a temperature higher than the melting and leaching temperature. The sheet is disclosed.

In these methods, two-color printing is performed by changing the temperature of the ink layer by changing the energy applied to the thermal head in two stages. However, when high energy is applied to raise the temperature of the ink layer to a high temperature, a relatively low-temperature area is created around the high-temperature area due to heat diffusion, so that the area printed at a high temperature is printed at a low temperature. This results in color fringes.

Furthermore, if high energy is applied to the thermal head, it will take a relatively long time for the temperature to drop.
Trails of colors printed at low temperatures tend to appear behind areas printed at high temperatures.

In addition, in either method, there is a restriction that a material with a relatively low drilling point must be used as the material for printing at low temperatures, resulting in problems such as scumming and reduced storage stability.

As a technique for solving this drawback, Mizu et al. previously proposed a recording method in Japanese Patent Application No. 60-298831.

In this recording method, at least first and second
By using a heat-sensitive transfer material provided with an ink layer, applying heat to the heat-sensitive transfer material, and then controlling the time for peeling the heat-sensitive transfer material and the recording medium, the ':ftj2 ink layer'fc selective Alternatively, the first and :JS2 ink cartridges are both transferred onto a recording medium.

This recording method has made it possible to solve various problems such as "fringing" and "tailing" in printing as described above, but even with this new two-color recording method, it is possible to improve the printing quality even further. Improvement in quality is desired. This improvement in printing quality is achieved, for example, by improving two-color separation, that is, when the peeling time is short, the first ink layer and the second ink layer are clearly separated, resulting in a clear transferred image of the second ink layer. This is achieved by obtaining a transferred image of both the first ink layer and the second ink layer when the peeling time is long.
Achieving such clear two-color separation depends on heat application conditions,
It is also related to actual recording conditions such as peeling conditions, and it has not always been easy.

&"LΩ"L The main purpose of the present invention is to solve the above-mentioned drawbacks of the conventional two-color printing method, and to develop a thermal transfer method that provides beautiful printing with good color separation on plain paper using a simple method. The aim is to provide materials.

As a result of intensive research, the inventors of the present invention obtained the above-mentioned patent application filed in 1983
In order to improve the selective transferability of the first and second ink layers in the recording method of No. 298831, it is necessary to improve the adhesive force between the two ink layers provided on the support and the adhesive force between the ink layer and the support. It has been found that it is essential that the values have a certain magnitude relationship at two specific temperatures.

The thermal transfer material of the present invention is based on the above knowledge,
More specifically, at least a first ink layer and a second ink layer are sequentially provided on a support from the support side, and the adhesive strength CF+ between the support and the first ink layer is
and adhesive strength between the first ink layer and the second ink layer (F2)
is characterized in that Fl>F2 at 90°C and Fl<F2 at 40°C.

Hereinafter, the present invention will be explained in further detail with reference to the drawings as necessary. In the following description, "quantity ratio" is used as "
%” and “Part J” are factory standards unless otherwise specified.

FIG. 1 is a schematic cross-sectional view in the thickness direction showing a basic aspect of the thermal transfer material of the present invention. Referring to FIG. 1, the thermal transfer material 1 of the present invention has a first ink layer 3 and a second ink layer on a support 2.
Ink layers 4 are sequentially provided.

In the thermal transfer material of the present invention, the first ink layer 3 - the second ink layer
The magnitude relationship between the adhesive force (F2) between the ink layers 4 and the adhesive force (Fl) between the first ink layer 3 and the support 2 is F at 90°C, >F2, and F at 40°C, <
It is necessary to be F2.

Here, the adhesive force F1. Specifically, the magnitude relationship of Ft at one temperature is easily confirmed, for example, by the following method.

That is, the thermal transfer material 1 and (for example, Beck smoothness 2
00 seconds) with a recording medium made of plain paper, and the thermal transfer material 1
The second ink layer 4 is placed in contact with the recording medium, and the second ink layer 4 is placed on the thermal transfer material 1 from the second surface of the support in a pattern (for example, a solid print) using a thermal head in the same manner as in a normal thermal transfer recording method. ). After applying heat, the thermal transfer material 1 and the plain paper were not separated, but were passed through a tensile strength tester (Tensilon RTM-100, manufactured by Toyo Baldwin) equipped with a constant temperature bath that can control the temperature from -60 to +270°C. Load 2q chicks so that the angle is 180 degrees. When the thermal transfer material 1 and plain paper are tested using the above test machine at a peeling speed of 300 arm/sec, and the border temperature (temperature of the constant temperature bath) is 90°C, the plain paper used as the recording medium 2 Ink 4 selectively transfers and confirms that Fl>F2, Fig. 2 (a)
), On the other hand, when the environmental temperature is 40°C, the first ink layer 3
and the second ink layer 4 (confirmation of F, < F2, Figure 52 (b)). At this time, the color tone of the colorant contained in the first ink layer and the second ink layer is changed. If you leave it there,
By obtaining an image with the color tone of the second ink at an environmental temperature of 90° C. and an image with the color tone of the first ink at an environmental temperature of 40° C., the magnitude relationship of the adhesive forces F and F2 can be easily confirmed.

In addition, in the present invention, in accordance with the above-mentioned evaluation of the adhesive force between the second ink layer and the first ink layer (F2) and the adhesive force between the :51 ink layer and the support (F+), , consider only the relative ease of separation between the second ink layer and the first ink layer and the separation between the first ink layer and the support when each ink layer is transferred to the recording medium,
Form of separation between ink layers (for example, the position of 'A separation is the second
Whether there is a strict boundary between the ink layer and the first ink layer, or how much of the adhesive layer (described later) remains on the heat-sensitive transfer material after transfer, etc.) are not considered when evaluating adhesive strength. shall be.

Second, the thermal transfer material of the invention exhibits a certain magnitude relationship in adhesive force at specific temperatures (90°C and 40°C) as described in . is a temperature used only to define the characteristics of the thermal transfer material 1 itself, and is a temperature used only to define the characteristics of the thermal transfer material 1 itself, and is
Thermal transfer record, 11) Conditions are not specified.

In the thermal transfer material of the present invention, the first and second ink layers have a certain relationship of Fl and F2 as described above, but more specifically, each layer preferably satisfies the following physical property conditions. .

That is, in order to realize the selective transfer (Fl>F2) of the second ink layer 4 as shown in FIG.
In , the cohesive force of the second ink layer 4 is the cohesive force of the first ink layer or the adhesive force between the first ink layer 3 and the support 2 (
Fl) is preferably smaller.

In this case, as shown in FIG. 2(a), the second ink is likely to be separated in the layer 4, and only the second ink layer 4 is transferred to the recording medium. At this time, the adhesive force (F3) between the second ink layer 4 and the recording medium needs to be greater than the cohesive force of the second ink layer 4.

From the above, the relationship between the first ink layer and the second ink layer is that it is desirable that the cohesive force of the first ink layer at 90°C is greater than that of the second ink layer, and that The greater the difference in cohesion between the ink layers, the less the first ink will mix with the second ink, and the clearer the tone of the recorded image formed by selective transfer of the second ink will be. Furthermore, in addition to having a large difference in cohesive force, it is desirable that the first ink layer 3 and the second ink layer 4 are substantially incompatible, that is, they are composed of different materials. In order to satisfy the requirements that there is a large difference in cohesive force and that they are not compatible, for example, the first ink layer is made of resins as exemplified later, the second ink layer is made of waxes, and the binder 100 of each is used. It is desirable that the content is at least 50 parts or more.

Next, in order to realize the transfer of the first and second ink layers as shown in FIG. 2(b), at 40°C, the cohesive force of the second ink layer 4 is It is preferable that the adhesive force (Fl) between the layer 3 is greater than the adhesive force (F,) between the recording medium and the second ink layer 3. If it is larger than the adhesive force (Fl), both the first ink layer 3 and the second ink layer 4 are transferred to the recording medium.

The preferable relationship of adhesive force or cohesive force as mentioned above is
In order to realize this more easily, a first adhesive calendar 5 may be provided between the support 2 and the first ink layer 3, as shown in FIG. This layer controls the adhesive force (Fl) between the first ink layer and the support, and it has a greater cohesive force than the second ink layer at 90°C, and has a higher adhesive force with the support at 40''C. If it is difficult for the first ink layer to have both the functions of This increases the range of selection, which is advantageous for adjusting print quality.

Further, as shown in FIG. 4, a second adhesive layer 6 may be provided between the first ink layer 3 and the second ink #4. This is a layer that controls the adhesive force (F2) with the second ink layer, but if the material of the second adhesive layer 6 is made to have similar characteristics to the second ink layer (in the case of FIG. 1), , the second ink layer 4 does not necessarily have the characteristics described in FIG. It becomes possible to use materials similar to those described above, which is further advantageous in improving printing quality.

Furthermore, as shown in FIG. 5, a third adhesive layer 7 may be provided on the second ink layer 4 (on the surface facing the recording medium).

This third adhesive layer 7 improves the adhesive force of the second ink layer 4 to the recording medium. Since the second ink layer 4 usually contains a certain amount of colorant, it is difficult to significantly increase the adhesive force of the second ink layer 4 to the recording medium. Therefore, providing the f53 adhesive layer 7 is particularly advantageous, for example, when performing two-color printing on a recording medium with low surface smoothness.

The first adhesive layer 5, second adhesive layer 6, and third adhesive layer 7 described above can be provided in a combination of two or more types, if necessary.

If we change the combination of layer configurations explained above, (3)
Depending on the presence or absence of the second adhesive layer, 23=8 different layer configurations are possible, but such layer configurations can be roughly divided into two depending on the presence or absence of the second adhesive layer. That is, depending on whether the first ink layer 3 and the second ink layer 4 are adjacent to each other, the combination of materials constituting these ink layers (or adhesive layer) changes.

As mentioned above, when the first ink layer and the fJS2 ink layer are adjacent to each other, it is preferable that the respective binders are made of materials that are incompatible with each other. Considering the cohesive force, the first ink layer is made of resin. It is desirable that the second ink layer contains at least 50 parts or more of a wax in 100 parts of each binder, and the first ink layer 3 may be made of a material that does not soften. When the first ink layer 3 and the second ink layer 4 are adjacent to each other, 90
When separating at 'C, the first ink layer 3 and the second ink layer 4
However, it is difficult to expect that the interface between the first and second ink layers after patterned heat application will necessarily remain in the state it was in when no heat was applied. Since it is difficult to completely separate these ink layers at this interface, such a separation mode is undesirable.

On the other hand, when the first ink layer 3 and the second ink layer 4 are not adjacent to each other, that is, when the second young attractive layer 6 (FIG. 4) is provided, there is a restriction that it is preferable to use a wax for the second ink layer. is excluded. However, in this case, the second adhesive layer 6
It is desirable that the wax contains 50% or more of waxes.
That is, in the case of such a configuration, when separated at 90° C., as shown in FIG. 6, it will be separated in the second adhesive layer 6, and the f52 ink layer 4 will be selectively transferred. .

Therefore, the configuration shown in FIG. 4 is more effective than the case where the second adhesive layer 6 is not provided. : Since there is no separation in the 4th layer, there is no variation in print density, which is advantageous.

Next, the structure of each part of the thermal transfer material 1 of the present invention will be explained in detail.

The support 2 of the thermal transfer material of the present invention has a thickness of 3 gm.
Plastic films such as polyester, aramid, nylon, and polycarbonate having a thickness of about 12 to 12 pm, or paper such as capacitor paper can be used. An excessively thick film is undesirable since it has poor thermal conductivity, but as long as it has high heat resistance and strength, it is also possible to use a thin film with a thickness of 3 mm or less.

In the thermal transfer material 1 of the present invention, the total weight of the ink P+ (or the adhesive layer) on the support 2 is desirably 20 gm or less;
The thickness of each of the first adhesive layer 5, the second adhesive layer 6, and the third adhesive layer 7 is preferably in the range of 0.5 to 104 m+.

In addition, it is also effective to provide a layer for supplementing heat resistance on the back surface of the support 2 (the surface opposite to the surface on which the ink layer is formed).

Further, when performing a thermal transfer recording method using the thermal transfer material 1 of the present invention, in addition to a thermal head, commonly used heating means such as infrared rays and laser beams can be used as heating means. In addition, in the case of single current heating, if necessary, a conductive layer made of thin +19 aluminum such as aluminum is provided between the support 2 and the first ink layer 3 to serve as a return electrode, or the ink is made conductive. And it is sufficient.

The first ink layer 3 constituting the thermal transfer layer on the support 2 is formed by dispersing a colorant of a first tone in a binder (this does not mean to exclude the state in which it is dissolved), and the second ink R4 is made by dispersing a colorant of a second tone in a binder.

In the thermal transfer material 1 of the present invention, when it is desired to obtain the color tone of the first ink layer 3 and the color tone of the second ink layer 4, a dark color such as black is applied to the first ink layer 3 and a dark color such as black is applied to the second ink layer 4. It is preferable to use a bright color such as yellow for the first ink layer 3.
If you want to obtain a color tone of , and a color mixture of the color tone of the first ink layer 3 and the color tone of the second ink layer 4, for example, if you color the first ink layer 3 yellow and the second ink layer 4 magenta. Magenta and red colors are obtained. In addition, by changing the pigment concentration or layer thickness ratio of each layer, various recordings of two different colors can be obtained.

Colorants include carbon black, nigrosine dye,
Lamp Kan, Sudan Black SM, Alkali Blue, First 2RO 10, Benjijinsha 2RO, Pigment・
Erow, India First Orange, Irgazine Red, Varanitroaniline Red, Toluidine Red, Paranitroaniline Fist Red, Toluidine Red, Carmine FB, Permanent and Bordeaux FRR, Pigment Orange R, Lysol Red 20, Lake・
Red C, Rhodamine FB, Rhodamine B Lake, Methyl and Violet B Lake, Phthalocyanine Blue, Pigment Blue, Prilliant Rei Clean B, Phthalocyanine Green, Oil Yellow GG, Zapon First 2 Row CGG, Kayaset Y963, Kayaset Y
G, Sumiblast Yellow G, Zapon First Orange RR, Scarlet in Oil, Sumiblast Orange G, Orazorsha Brown B, Pomelo First Scarlet CG, Eisenspiron Red BEH, Oil Pink OP, Victoria Blue F4R, First Gen All known dyes and pigments such as Blue 5007, Sudan Blue, and Oil Peacock Blue can be used (in combination of two or more if necessary). Others: copper powder,
Metal powder such as aluminum powder, mineral powder such as mica, etc. can be used. Furthermore, as other additives, surfactants, plasticizers, mineral oil,
Vegetable oil, fillers, etc. may be added as appropriate.

The binder used for the first ink layer and the second ink layer and the material used for the first and second adhesive layers include natural waxes such as spermaceti wax, beeswax, lanolin, carnauba wax, candelilla wax, montan wax, and ceresin wax; Petroleum wax such as paraffin wax and microcrystalline wax, oxidized wax, ester wax, low molecular weight polyethylene, synthetic wax such as Fischer-Tropsch wax, lauric acid, myristic acid,
Wax W4 such as higher resin acids such as palmitic acid, stearic acid, and behenic acid, higher alcohols such as stearyl alcohol and behenyl alcohol, esters such as sucrose fatty acid ester and sorbitan fatty acid ester, amides such as oleylamide, etc.: or polyolefin resins, polyamide resins, polyester resins, epoxy resins, polyurethane resins, polyacrylic resins, polyvinyl chloride resins, cellulose resins, polyvinyl alcohol resins, petroleum resins, phenolic resins, polystyrene resins , vinegar-ugly vinyl resin, natural rubber, styrene-butadiene rubber, isoprene rubber, chloroprene rubber,
Elastomers such as, resins such as polyisobutylene, polybutyne: etc. 2 as necessary! ! The above are used in combination.

The content of the young coloring agent in the first ink layer and the second ink layer is the same as the content of the young coloring agent in the first ink layer and the second ink layer. For each of the second ink layers, 1 to
90%, more preferably a range of 2 to 80%.

Adjust the molecular weight, degree of delivery, etc. of the above-mentioned materials as appropriate,
Alternatively, an ink layer or adhesive layer having the above characteristics can be obtained by mixing a plurality of the above materials.

However, in the thermal transfer material of the present invention, as described above, the combination of physical properties such as softening temperature, melt viscosity, and adhesive strength of each layer or the types of binder materials used is ff1W.

Among the binder materials mentioned above, the gSl ink layer and the second
When the ink layers are adjacent to each other, it is preferable that the first ink contains a resin-based binder and the second ink contains a wax-based binder in an amount of at least 50 parts or more in 100 parts of each binder.On the other hand, the T51 ink layer and,
If the second ink layer is not adjacent to the second ink layer, that is, the second contact 27
When layer 6 is interposed, the first ink layer is resin-based, the second ink layer is
It is preferable that the adhesive layer contains at least 50 parts or more of a wax-based binder in 100 parts of each binder, and furthermore, when a resin binder is used for the second ink, the resin of the first ink and the second ink is It is preferable that the ink is of a different type. In addition, in the case of a resin-based ink, it does not necessarily have to be made of resin only, and it is sufficient that the resin component is contained in 50 parts or more in 100 parts of the binder. In the case of ink, it is sufficient that 50 parts or more of the wax component is contained in 100 parts of the binder.

In manufacturing the thermal transfer material of the present invention, a coating solution is prepared by mixing the materials constituting each of the layers described above with an organic solvent capable of dissolving the binder, such as methyl ethyl ketone, xylene, or tetrahydrofuran, and each layer is sequentially coated. All you have to do is work it out.

Alternatively, after mixing the materials constituting each layer, they may be heated and melted to perform a so-called hot melt coating in the molten state.

Furthermore, the materials constituting each layer may be mixed and coated as an aqueous emulsion by adding a dispersant such as a surfactant, or each layer may be coated by a different method using these methods. It is also possible to do so.

Next, a two-color printing method using the thermal transfer material of the present invention will be explained.

Specifically, a mounting as shown in FIG. 7 is preferably used.

Referring to FIG. 7, the thermal transfer material 1 is transferred to the thermal head 8.
At the same time, the thermal head 8 applies heat in a pattern to the thermal transfer material 1. At the same time, the thermal head 8 applies patterned heat to the thermal transfer material 1. Immediately after this heat application, when the recording medium 9 and the thermal transfer material 1 are tilled at the end portion 8a of the thermal head 8, (because F, >F)
Only the second ink layer is transferred to the recording medium 9. On the other hand, move the peeling control member 10 in the direction of the arrow to
(dotted line) and place it on the recording medium 9 in the same way as above.
The thermal transfer material 1 is brought into pressure contact with the thermal head 8 and heat is applied in a patterned manner by the thermal head 8, and then the peeling control member 10
When it is peeled off at the position (10a) (because F□×F2), both the first and second ink layers are transferred to the recording medium.

Stand "LL" L! As described above, according to the present invention, at least the first ink layer and the second ink layer are provided on the support, and the support -
A thermal transfer material is provided in which the adhesive force between the first ink layer (F, ) and the adhesive force between the first ink layer and the second ink layer (F2) have a specific magnitude relationship at two specific temperatures. .

If the thermal transfer material of the present invention is used, beautiful two-color printing can be performed on paper, etc. by simply changing the time period from when energy is supplied in a pattern until the thermal transfer material is separated from the recording medium. I can do things.

In particular, in the thermal transfer material of the present invention having an adhesive layer between the first ink layer and the second ink layer, when the second ink layer is peeled off from the support, the adhesive layer can separate the second ink layer. Therefore, the ink layer can be transferred to the recording medium in a layered state. Therefore, if such a thermal transfer material is used, it can be applied even to recording materials such as paper with relatively low smoothness.
Beautiful two-color printing with less blurring etc. can be obtained. Furthermore, when the thermal transfer material of the present invention having an adhesive layer between the first ink layer and the support is used, the first ink layer can be transferred onto the second ink layer while remaining layered. Therefore, the zero hiding power of the first ink layer can be strengthened, and the color tone of the first ink can also be beautiful.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

In the present invention, the melt viscosity and the number average molecular weight of polyethylene oxide were measured by the following measuring method.

[Molecular weight measurement method]

VPO (Vapor Pressure Osmose)
For example, using benzene as a solvent, polyethylene oxide is 0.2 to 1. Og/100
Dissolve in m1 benzene at several different concentrations (C), measure each osmotic pressure (π/c), and plot the concentration C - osmotic pressure π/c.

The osmotic pressure (π/c)o at infinite dilution is read from this plot, and (π/C)OIIRT/M! The number average molecular weight Mn is determined from the formula for l.

[Melt viscosity measurement method]

Melt viscosity is measured using a rotational viscometer (E type).

Ink 1 The liquid amount and melt viscosity are all based on the solid content.) The above-mentioned outer components were thoroughly mixed to prepare ink 1.

This ink l was coated on a polyethylene terephthalate film support (hereinafter referred to as PET) with a thickness of 6 gm, and
It was dried at 0° C. to form a first ink layer of coating i2g/go.

Ink 2> was coated on the first ink layer formed by light, and water was allowed to evaporate at 70°C to form a second ink layer with a coating weight of 3 g/m'', as shown in Figure 1. A thermal transfer material (I) having a layered structure was obtained.

Ink 3 and Ink 4 were manufactured by YB. Ink 1 as in Example 1
After forming the first ink layer with Ink 3, a second adhesive layer with a coating weight of 1.0 g/rn' was formed, and further a second ink layer with a coating weight of 265 g/m' was formed with Ink 4. A thermal transfer material (II
) was obtained.

Ink 5> Ink 6 and Ink 7 were prepared. Coating amount of 1.0 g/m with ink 5 on a PET support with a thickness of 4.5 mm
'' with a coating amount of 2.0 g/m using ink 6.
Coat the first ink layer of 1.ogi with ink 7.
m' second adhesive layer with ink 4 in a coating amount of 2.5 g/
A second ink layer of black and white was sequentially formed to obtain a heat-sensitive transfer material (m).

Thermal transfer materials (I), (II), prepared as above,
(III) (7) A high-quality paper with a smoothness of 200 seconds is placed on the second ink layer side, a thermal head 11 is used as a heat source, pulse period is 1, 4+5 sec, pulse width is 0, 7
trsec, applied energy 13 mJ/l1m2
A pattern of heat corresponding to solid black printing was applied to the heat-sensitive transfer material to thermally bond the heat-sensitive transfer recording material to the high-quality paper. The superimposed body of the heat-sensitive transfer material and high-quality paper that were thermally bonded in this way was subjected to a tensile strength test ia < Tensilon RTM-100, Toyo Baldwin Co., Ltd.! 11) and set the peeling angle iao
The thermal transfer material was peeled off from the high-quality paper at a peeling speed of 300 mm/sec.

If the ambient air temperature at the time of separation is 40℃, the thermal transfer material (I)
, (II), and (m).

The ink from the heat application section was transferred to the high-quality paper, and a solid black recorded image was obtained (F□<F2).

When the ambient temperature is 90°C, the thermal transfer material (I), (r1
) and (m), a clear blue recorded image was obtained by the transfer of the second ink layer, and the first ink layer remained on the PET support side.CF! >F,).

Next, the above thermal transfer materials (I), (r1), and (m) were placed on Typestar 6 manufactured by Canon V4 and printed.

Referring to FIG. 7, as the thermal head 8, a ROHM head with a distance of 350 l from the center of the heat generating part to the end 8a of the thermal head was used, and the thermal head 8 and the thermal transfer material ribbon l were mounted. The carriage 13 has a moving speed of 5
It was moved in the direction of arrow B at 0 mta/sec. Therefore, when rapidly removing 2q, the time from heat application to peeling was about 7 m5ec.

Further, the peeling control member 10 for performing peeling with a delay in time is attached at a position 5□ (intersection = 5 as) downstream in the transfer direction of the thermal transfer material 1 from the terminal end 8a of the thermal head. When peeling was delayed, the time from heat application to peeling was about 100 m5ec. The position of the peeling control member 10 is from 2■ to 20m.
There was almost no change in the printing results even when the number was changed up to m.

When the thermal transfer materials (I), (II), and (III) were used to print on plain paper as described above, the prints were blue when peeled off rapidly, and black when peeled off after a while. was obtained.

When using the thermal transfer material CI), the blue print was a little lighter in blue than when using the thermal transfer materials (II) and (m), and some density unevenness was observed, but in practice, It was sufficiently good.

On the other hand, when the thermal transfer materials (T) and (II) were used, black printing had a slightly strong bluish tinge, but it was sufficient for practical use. The color was almost pure black.

Thermal transfer material (IV) was prepared in the same manner as in Example 3, except that a second ink layer was formed in place of Ink 8, which was obtained by mixing ink 8〉 with 1 liter of soil.
I got it.

A thermal transfer material (V) was obtained in the same manner as in Example 3, except that a second adhesive layer was formed in place of Ink 9 obtained by mixing Chikasa 1 and Ink 9.

The thermal transfer materials (IV) and (V) were thermally adhered to high-quality paper using a thermal head in the same manner as when using the thermal transfer materials (I), (II), and (m> of the present invention), and a tensile strength test was conducted. When peeled off using a machine, a solid black recorded image was obtained at both environmental temperatures of 40°C and 90°C.Also, when the above thermal transfer material (rV) was used, and when the thermal transfer material (I) was used, Similarly, when printing was performed with Typestar 6, when it peeled off rapidly, only a blue-black recorded image was obtained, with an extremely large amount of black spots mixed in with the blue print, and was not suitable for practical use.

In addition, Typester 6 was also used in the same manner using the thermal transfer material (V).
However, even if the peeling time was changed, only a black recorded image could be obtained.

[Brief explanation of drawings]

1 to 7 are schematic cross-sectional views of the thermal transfer material viewed in the thickness direction, and FIGS. 1 and 3 to 5 are examples of the layer structure of the thermal transfer material of the present invention. , Figures 2 and 6
The figure shows an example of the mode of transfer in the thermal transfer material of the present invention,
FIG. 7 shows one embodiment of a thermal transfer recording device used when performing two-color recording using the thermal transfer material of the present invention. l...Thermal transfer material 2...Support 3...First ink layer 4...Second ink layer 5...First adhesive layer 6...Second adhesive layer 7...First 3 Adhesive layer 8... Thermal heater pad 9... Recorded object 10... Peeling control member 11... Platen 12a... Unwinding core 12b... Winding core 13... Carriage ΩJ: Figure 1 Figure 13 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] At least a first ink layer and a second ink layer are sequentially provided on a support from the support side, and the adhesive force (F_1) between the support and the first ink layer is and a thermal transfer material characterized in that the adhesive force (F_2) between the first ink layer and the second ink layer is F_1>F_2 at 90°C and F_1<F_2 at 40°C.