JPS6399987A - Thermal transfer material - Google Patents

Abstract

PURPOSE:To obtain a beautiful two-color print on an ordinary paper, by providing a first ink layer, an adhesive layer and a second ink layer on a base, setting the adhesive force between the base and the first ink layer and that between the first and the second ink layer in a specified relationship, and causing a wax component, a heat-sensitive adhesive component and all components in the second ink layer to satisfy specified conditions. CONSTITUTION:A first ink layer 3, an adhesive layer 5 and a second ink layer 4 are provided on a base 2. The adhesive force F1 between the base and the first ink layer 3 and the adhesive force F2 between the first ink layer 3 and the second ink layer 4 are so set that F1>F2 at high temperatures and F1<F2 at low temperatures. The second ink layer 4 consists of a particulate wax component, a particulate heat-sensitive adhesive component and a coloring agent component. The melt viscosity at 150 deg.C of the adhesive component is 10<3>-10<6> cP, and the melt viscosity at 150 deg.C of the mixture of the wax component, the adhesive component and the coloring agent component is 10<3>-10<5> cP. By the use of this thermal transfer material, it is possible to enhance not only the recording quality when the second ink layer 4 is transferred but the recording quality when both of the first and second ink layers 3, 4 are transferred.

Description

[Detailed description of the invention]

(Technical Field) 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. (Background technology) The thermal transfer recording method has the general characteristics of the thermal recording method that the equipment used is lightweight, compact, noiseless, and has excellent operability and maintainability. In addition, it does not require colored processed paper. It also has the feature of excellent durability of recorded images, and has recently been widely used.This thermal transfer recording method generally involves recording coloring in a heat-melting binder on a sheet-like support. Using a thermal transfer material coated with a thermal transfer ink containing a dispersed agent, this thermal transfer material is superimposed on a recording medium such that the thermal transfer ink layer is in contact with the recording medium, and the thermal transfer material is supported. By supplying heat with a thermal head from the body side and transferring the melted ink layer to the recording medium, a transferred recorded image is formed on the recording medium according to the shape of the heat supply.Also, the thermal transfer described above There is a strong market demand for two-color printing while taking advantage of the advantages of recording methods, and various technologies for obtaining two-color printing have been proposed. Conventionally, two-color printing was performed on plain paper using a thermal transfer recording method. As a method, JP-A-56-148591 discloses a method in which two heat-melting high-melting point ink layers A and a low-melting point ink layer B containing different colorants are sequentially laminated from the substrate side on a substrate. In the case of low heat applied energy, only the low melting point ink layer B is transferred onto the plain paper, and in the case of high heat applied energy, both the heat melting ink layers A and B are transferred to give a two-color recorded image. A color-type thermal transfer recording element is disclosed. Also, JP-A-59-64389 discloses an ink that melts and leaches onto a substrate by heating, and an ink that melts and peels off at a temperature higher than the melt-leaching temperature. A two-color thermal transfer ink sheet having an ink layer consisting of 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. Edges of colors printed at low temperatures will appear around the edges.Furthermore, if high energy is applied to the thermal head, it will take a relatively long time for the temperature to drop, so the area behind the area printed at high temperatures will In addition, in either method, there is a restriction that a material with a relatively low melting point must be used as the material for the ink printed at low temperatures, which may cause background smudges, Problems such as a decline in maintainability had arisen. As a technique for solving this drawback, the present applicant 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 and applying heat to the heat-sensitive transfer material, the second ink layer can be selectively or , a method in which both the first and second ink layers are transferred to a recording medium. This recording method made it possible to solve various problems such as "edging" and "one tail" of printing mentioned above, but even with this new two-color recording method, it is possible to solve even more printing problems. Improvement in quality is desired. This improvement in printing quality includes, for example, the quality of the transferred image of the second ink layer and the transferred images of both the first and second ink layers. In particular, the quality of the transferred image obtained by transferring both the first ink layer and the second ink layer is greatly influenced by the transfer state of the second ink layer. That is, it is extremely important for the first ink layer to have the property of faithfully transferring onto the transfer site of the second ink layer, and if this property is impaired, the transfer of the first ink layer will be defective, and the transfer of the second ink layer will occur. As a result of the first ink layer being transferred to only a portion of the area, the resulting recorded image differs from the desired hue of the first ink layer, and may have a mixed color affected by the hue of the second ink layer, or may have an uneven hue. Become. (Objective of the Invention) The object of the present invention is to provide a thermal transfer material that eliminates the above-mentioned drawbacks of the conventional two-color printing method and provides beautiful two-color printing on plain paper using a simple method. be.

[Summary of the invention]

As a result of extensive research, the present inventors have found that the characteristics of the material used for the second ink layer are extremely important for the above-mentioned improvement in recording quality. The thermal transfer material of the present invention is based on the above-mentioned knowledge, and more specifically, at least a first ink layer, an adhesive layer, and a second ink layer are sequentially provided on a support from the support side, and The adhesive force with the first ink layer (FI) and the adhesive force between the first ink layer and the second ink layer (F2) are such that FI>F2 at high temperature and F at low temperature.
1<F2, the second ink layer is composed of at least a fine particle wax component, a fine particle thermal adhesive component, and a colorant component, and the wax component, the thermal adhesive component, and all the components meet the following conditions ( I) The melt viscosity of the adhesive component at 150°C! 03
~106 cp. (II) 150°C of mixture of wax component and adhesive component
The melt viscosity at is 103 to 106 cp. It is characterized by this. Hereinafter, the present invention will be described in further detail with reference to the drawings as necessary. In the following description, r% representing the quantitative ratio
"and r part" are based on weight unless otherwise specified. [Detailed Description of the Invention] 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, a thermal transfer material 1 of the present invention includes a first ink layer 3 and a second ink layer on a support 2.
Ink layers 4 are sequentially provided. In the present invention, the adhesive force (F2) between the second ink layer and the first ink layer, and the adhesive force (F2) between the first ink layer and the support
Regarding the size relationship of F1), 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 is considered. shall be considered, and the form of peeling between ink layers (
For example, whether the position of peeling is at the exact boundary between the second ink layer and the first ink layer, or how much of the adhesive layer (described later) remains on the thermal transfer material after transfer, etc.) Evaluation of adhesive strength shall not be considered. In the thermal transfer material of the present invention, the first and second ink layers have a certain relationship of F, F2 as described above, but more specifically, each layer must satisfy the following physical property conditions. desirable. That is, in order to realize the selective transfer (Fl>F2) of the second ink layer 4 as shown in FIG. It is preferable that the adhesive force (F1) between the first ink layer 3 and the support 2 is smaller than the cohesive force (F1) between the first ink layer 3 and the support 2. In this case, as shown in FIG. 2(a), the second ink layer 4 is likely to be divided, 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 (0) of the first ink layer at high temperatures is larger than that of the second ink layer. The greater the difference in cohesive force between the first and second 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. This large difference in cohesive force and
In order to satisfy the requirement of incompatibility, for example, the first
The ink layer contains resins such as those exemplified later, and binder 1.
It is desirable that the content be at least 50 parts or more out of 00 parts. Next, in order to transfer 'tS1 and the second ink layer as shown in FIG. 2(b), it is necessary to
The cohesive force of the ink layer 4 is preferably larger than the adhesive force (Fl) between the support 2 and the first ink F13. In this case, the adhesive force (F, )
is greater than the adhesive force (Fl) between the support 2 and the first ink layer 3, then the first ink layer 3. Both layers of the second ink layer 4 are transferred to the recording medium. The preferable relationship between adhesive force or cohesive force as described above is
In order to realize this more easily, it is preferable to provide a first adhesive layer 5 between the support 2 and the first ink layer 3, as shown in FIG. This first adhesive layer 5 is a layer that controls the adhesive force (F1) between the first ink layer and the support, and has a larger cohesive force than the second ink layer at high temperatures, and at low temperatures. If it is difficult for the first ink layer to have the function of reducing the adhesive force with the support over time, it is preferable to provide the first ink layer. By providing such a first adhesive layer 5, the material for the first ink layer 3 can be selected more widely, which is advantageous for adjusting print quality. Further, as shown in FIG. 4, it is preferable to provide a second adhesive layer 6 between the first ink layer 3 and the second ink layer 4. This is a layer that controls the adhesive force (F2) with the second ink layer, and the material of this second adhesive F16 is
As long as the second ink layer 4 has similar characteristics to the ink layer, the characteristics described in FIG. For example, it becomes possible to use the same material as the first ink layer in the embodiment shown in FIG. 1, which is further advantageous in improving printing quality. The first adhesive layer described above5. The second adhesive layer 6 can be provided in appropriate combinations as necessary. Next, the structure of each part of the thermal transfer material 1 of the present invention will be explained in detail. As mentioned above, the second ink layer 4 includes a fine particle wax component,
Consists of a particulate thermal adhesive component and a colorant component. Wax ingredients include whale wax and beeswax. lanolin, carnauba wax, candelilla wax,
Natural waxes such as montan wax and ceresin wax, petroleum waxes such as paraffin wax and microcrystalline wax, oxidized waxes, ester waxes,
Low molecular weight polyethylene, synthetic waxes such as Fischer-Tropsch wax, lauric acid, myristic acid. Higher resin acids such as valmitic 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, and amides such as oleylamide are used. Next, the thermal adhesive components are ethylene vinyl acetate copolymer and ethylene acrylate copolymer. Ethylene polymers such as ethylene isobutyl acrylate copolymer, diene polymers such as styrene butadiene copolymer, styrene isoprene copolymer, polybutadiene polyisobutylene, acrylic ester copolymer,
Acrylic ester polymers such as methacrylic ester copolymers, vinyl ether polymers, polyamide resins, polyester resins, polyurethane resins, etc. are used, and rosin and dammar are used as necessary. Copal, hydrogenated rosin, hydrogenated rosin ester. Adhesive agents such as coumaron indene, polyterpene, alkyd resins, five-oil hydrocarbon resins, xylene resins, and epoxy resins, and phthalate esters. It is also possible to appropriately add and use plasticizers such as phosphoric acid esters and chlorinated paraffin, softeners such as animal oils and vegetable oils, fillers, stabilizers, and anti-aging agents. In particular, the thermal adhesive component has a melt viscosity of 10 at 150°C.
6 to 106 cp, preferably 103 to 106 cp is used. Furthermore, the melt viscosity of the mixture of the wax component, thermal adhesive component, and colorant component described above is 103 to IO' at 150°C.
cp, preferably 103 to 106 cp. Here, the melt viscosity is measured using a rotational viscometer (E type).
This is the value measured at the above temperature. If the melt viscosity of the mixture is less than 106 cp, the mixture will consist of entanglements as shown in FIG. 6, and in the case of a recording medium such as paper whose surface is not smooth, the second ink layer will be formed as shown in FIG. 6(b). There are parts where the liquid penetrates partially and parts where it does not penetrate and adheres near the surface of the recording medium. As a result, the first
The part where the ink layer is transferred to the recording medium is only the part where the second ink layer has not penetrated, and the recorded image obtained is different from the hue of the first ink layer, and the color tone of the second ink layer is different from that of the first ink layer. The color tone becomes a mixture of colors. Moreover, if it is larger than 106 cp, as shown in FIG. 6(e), the penetration into the recording medium is extremely suppressed, making it susceptible to the influence of pressure applied at the same time as heat application, resulting in a transferred image of only the second ink layer. , that is, at high temperatures, the first ink layer is minutely transferred to the transferred image obtained when the thermal transfer material and the recording medium are separated. As a result, the resulting transferred image cannot faithfully reproduce the color tone of the second ink layer. As mentioned above, the thermal adhesive component suitably has a melt viscosity of 103 to 106 cp at 150°C. If it is smaller than 103 cp, the melt viscosity of the second ink layer as a whole becomes low, and the color tone of the second ink layer cannot be faithfully reproduced, as shown in FIG. 6(C). Moreover, if it is larger than 106 cp, there will be an extreme difference in the softening or melting state with the coexisting wax component during thermal softening. That is, although the wax component present in the form of fine particles in the second ink layer is in a state close to a molten state, the thermal adhesive component exhibits adhesive force to the recording medium, but it is not mixed with the wax. does not melt or soften, and each component adheres or penetrates independently. It also becomes susceptible to the effects of pressure applied along with heat, and as a result, as shown in Figure 6(d),
In the transfer image area corresponding to the center of the heating element, the state of wax penetration is remarkable (because the temperature is highest at the center of the heating element), and in the area around the heating element, the thermal adhesive component is attached near the surface of the recording paper. state. Therefore, the state of the transferred image transferred by both the first ink layer and the second ink layer at low temperatures tends to be such that the first ink layer is not transferred to the center.This phenomenon occurs when the heating element is continuously applied to two or more dots. When heated to form a character pattern or the like, the color tone at the center of the character pattern tends to be mixed with the color tone of the second ink layer. Colorants include carbon black, nigrosine dye,
Lamp black, Sudan black SM. Alkaline Blue, First Niro, Benzidine Niro, Pigment Yellow, India First Orange, Irgazine Red. Paranitroaniline Red, Toluidine Red, Varanitroaniline Red, Toluidine Red, Carmine FB, Permanent Bordeaux FRR, Higment Orange R. Lysole Red 20. Lake Red C. Rhodamine FB, Rhodamine B Lake, Methyl Violet B Lake, Phthalocyanine Blue, Pigment Blue, Brilliant Green B, Phthalocyanine Green, Oil Yellow GG, Zapon First 2 Row〇〇〇, Kayaset Y963. Kayaset YG, Sumiblast Yellow G, Zapon Fast Orange RR. Oil Scarlet, Sumiblast Orange G, Orazole Brown B, Pomelo First Scarlet C
G, Eisenspiron Red BEH, Oil Pink O
P, Victoria Blue F4R, First Dan Blue 5
All known dyes and pigments such as 00F, Sudan Blue, and Oil Peacock Blue can be used (in combination of two or more if necessary). In addition, metal powders such as copper powder and aluminum powder, mineral powders such as mica, etc. can be used. The above-mentioned components are dispersed in the form of fine particles to form the second ink layer, and the particle diameter thereof is 0.1 to 5 μm, preferably 0.1 to 2 μm, and more preferably 0.1 to 1 μm. The composition ratio of each component is 40% to 90% wax component.
, preferably 50% to 85%, thermal adhesive component 50% to
5%, preferably 40-10%, colorant component 2%-4
It is contained in a proportion of 0%, preferably 5 to 30%. The support 2 of the thermal transfer material of the present invention has a thickness of 3 μm.
Polyester of about 12 μm. Plastic films such as aramid, nylon, and polycarbonate, or paper such as capacitor paper are used. Excessively thick materials are undesirable as they have poor thermal conductivity.
As long as it has high heat resistance and strength, it is also possible to use a thin film with a thickness of 3 μm or less. 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). The first ink layer 3 is formed by dispersing a coloring material in a binder. As the binder, the waxes used in the second ink layer described above can be used as they are, and in addition, polyolefin resins, polyamide resins, polyester resins, and epoxy resins can be used. Polyurethane resin, polyacrylic resin. Polyvinyl chloride resin, cellulose resin. Polyvinyl alcohol-based resin 10,000 oil-based resin. Elastomers such as phenol resin, polystyrene resin, vinyl acetate resin, natural rubber, styrene-butadiene rubber, isoprene rubber, and chloroprene rubber; resins such as polyisobutylene and polybutene; can be used. However, it is preferable to use 50% or more of the resins mentioned above.As the colorant, the colorant used in the second ink can be used as it is, and the colorant is 7j
It is contained in the S1 ink layer in an amount of 2 to 90%. The first adhesive layer and the second adhesive layer can be provided as appropriate,
As materials used for the adhesive layer, the waxes and resins exemplified for the first ink layer and the second ink layer can be used as they are, or two or more of them may be mixed and used as necessary. . The basic components of the ink layer and the adhesive layer are as described above, but other surfactants, fillers, plasticizers, oil agents, etc. may be added as appropriate. In manufacturing the thermal transfer material of the present invention, the first ink and the adhesive layer are made of the materials constituting each layer described above, such as methyl ethyl ketone and xylene. A coating solution may be prepared by dissolving a binder such as tetrahydrofuran and mixing with an organic solvent, and each layer may be coated in sequence. Furthermore, after mixing the materials constituting each layer, they may be heated and melted to perform so-called hot met coating in the molten state. Furthermore, the materials constituting each layer may be mixed and applied as an aqueous emulsion by adding a dispersant such as a surfactant. Furthermore, using these methods, it is also possible to coat each layer using a different method. In the second ink layer, it is important that the wax component, the thermal adhesive component 1, and the coloring and abrasive component are fine particles. Therefore, in forming the second ink layer, the above-mentioned components may be dispersed in the above-mentioned organic solvent to prepare a coating liquid and then applied. Further, the organic solvent may be water, and the best method is to form an aqueous emulsion by using an emulsifier or a dispersant such as a surfactant as necessary for each of the above-mentioned components, and then mix and apply each component. It is. In the thermal transfer agent 1 of the present invention, the entire ink layer (or adhesive layer) on the support 2 preferably has a thickness of 20 μm or less, and the first ink layer 3, the second ink layer 4. First adhesive layer5. The thickness of the second adhesive layer 6 is 0.5~
10 μm. Preferably, the range is 0.5 to 5 μm. Further, when performing a thermal transfer recording method using the thermal transfer material 1 of the present invention, a heating means other than a thermal head may be used.
Commonly used heating means such as infrared rays and laser beams can also be used. In addition, in the case of electrical heating, if necessary, a conductive layer made of a thin film of aluminum or the like is provided between the support 2 and the first ink 3 to serve as a return electrode, or the ink is made conductive. do it. Next, a two-color printing method using the thermal transfer material of the present invention will be explained. Specifically, an apparatus 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 (so that the second ink layer faces the recording medium). Immediately after applying this heat, the recording medium 9 and the thermal transfer material 1 are connected to each other by the terminal end 8a of the thermal head 8! When you release II, (because FB>Fz)
Only the second ink layer is transferred to the recording medium 9. On the other hand, ff
i+J=t+control member 10 in the direction of arrow A
The recording medium 9 and the heat-sensitive transfer material 1 are brought into pressure contact with each other in the same manner as described above, and patterned heat is applied by the thermal head 8. Then, ? When peeled off at the position (I0a) of the release control member 1o (
F, <F2) Both the first ink and second ink layers are transferred to the recording medium. [Example 1] Ink 1 (In the above and the following description, the amount of the dispersion liquid indicates the value for the solid content.) Each component of the above formulation was thoroughly mixed to prepare Ink 1. This ink 1 was coated on a polyethylene terephthalate film support (hereinafter referred to as PUT) with a thickness of 4.5 μm and dried at 70° C. to form a first ink layer with a coating weight of 2.5 g/m 2 . <Ink 2><Ink3> Melt viscosity of the above mixture 5xlO3 cps at 150°C Each ink of the above formulation was thoroughly mixed, and Ink 2 was coated on the previously formed first ink layer, dried, and the coating amount was 1.037 m2 of the second adhesive layer was further coated with Ink 3, dried, and the coating amount was 2.6 g/
A second ink layer of 150°C was formed to obtain a thermal transfer material (I). [Example 2] <Ink 4> Ink 5> The melt viscosity of the above mixture was 7 x 103 cps at 150°C. The first coating amount was 0.8 g/m' on 5 μm PET.
11 adhesion layer, the first ink layer of 2.5 g/m' with ink 1, the second adhesive layer of 1.0 g/m' with ink 2, and the second adhesive layer of 2.5 g/m' with ink 5. 2 ink layers were formed to obtain a thermal transfer material (II). (Example 3) <Ink 6> Melt viscosity of the above mixture 5xlO' cps at 150°C Ink 5 of Example 2 was replaced with the above ink 6. Thermal transfer material (Ill)
I got it. (Example 4) <Ink 7><Ink 8) Melt viscosity of the above mixture 1.5xlO3cps at 150°C 4.5 μm
A first adhesive layer of 1 g/m 2 with ink 4 on PET of A second ink layer of .5 g/m 2 was laminated to form a thermal transfer material (IV). (Comparative Example 1) <Ink 9> An ink with the following formulation was prepared using the materials used for Ink 8 of Example 4. Melt viscosity of the above mixture was 8 x 106 cps at 150°C. Thermal transfer material (V
) was obtained. (Comparative Example 2) <Ink 10> Ink 8 in Example 4 was replaced with Ink 10, and a thermal transfer material (
■) was obtained. [Comparative Example 3] Ink 11> Melt viscosity of the above mixture: 2×106 CpS at 150° C. A thermal transfer material (■) was obtained by replacing Ink 8 in Example 4 with Ink 11. Next, the above heat-sensitive transfer material (I) was mounted on Type Star 6 manufactured by Canon ■, and printing was performed on high-quality paper with a smoothness of 20 seconds. Referring to FIG. 7, as the thermal head 8, a head made by ROHM ■ with a distance of 350 μm from the center of the heat generating part to the end 8a of the thermal head is used, and a carriage 13 on which the thermal head 8 and the thermal transfer material ribbon 1 are mounted is used. is 8a speed 5
A force of 13 mm was applied in the direction of arrow B at 0 mm/sec. Therefore, when peeling off rapidly, the time from heat application to peeling was about 7 m5ec. Further, a peeling control member 10 for performing peeling with a delayed time was attached at a position 5 mm downstream in the transfer direction of the thermal transfer material 1 from the terminal end 8a of the thermal head (u=5 mm). Therefore, when peeling was performed with a delay, the time from heat application to peeling was about 100 m5ec. The position of the peeling control member 10 is changed from λ=2mm to fL=20.
There was almost no change in the printing results even when the thickness was changed up to mm. The printing results obtained are shown in the attached table. (Effects of the Invention) As described above, according to the present invention, the present invention includes at least a first ink layer and a second ink, and a thermal adhesive component constituting the second ink layer, and the thermal adhesive component and a wax component. and the colorant component have a melt viscosity of 103 to 1 at 150°C, respectively.
06 cps and 103-106 cps are provided. By using the thermal transfer material of the present invention, it is possible to improve not only the recording quality of the second ink layer but also the recording quality when both the first and second ink layers are transferred. It becomes.

[Brief explanation of the drawing]

1 to 7 are schematic cross-sectional views of the heat-sensitive transfer material viewed in the thickness direction, and FIG. 3 and 4 are examples of the layer structure of the thermal transfer material of the present invention, FIGS. 2, 5, and 6 are examples of the aspect of the thermal transfer material of the present invention during transfer, and FIG. 7 1 shows one embodiment of a thermal transfer recording device used when performing two-color recording using the thermal transfer material of the present invention. 1 -----1 Thermal transfer material 2 ------1 Support 3 ------1 First ink layer 4 ------1 Second ink layer 5 ------1 1 Adhesive layer 6 -1--Second adhesive layer 7--Third adhesive layer a--Thermal head 8'--1Heating element 9--1--Recorded Body 10 - Peeling control member 11 - Platen 12a - Unwinding core 12b - Winding core 13 - Carriage

Claims (1)

[Scope of Claims] At least a first ink layer, an adhesive layer, and a second ink layer are sequentially provided on a support from the support side, and the adhesive force between the support and the first ink layer ( F_1) and the first
The adhesive force (F_2) between the ink layer and the second ink layer is F_1>F_2 at a relatively high temperature, and F_1<F_2 at a relatively low temperature, and
The ink layer consists of a binder consisting of at least a particulate wax component and a particulate thermal adhesive component, and a colorant component,
A thermal transfer material characterized in that the wax component, the thermal adhesive component, and all the components satisfy the following conditions (I) and (II). (I) The adhesive component has a melt viscosity of 10^3 to 10^6 cp at 150°C. (II) The melt viscosity at 150°C of the mixture of wax component, adhesive component, and colorant component is 10^3 to 10^5c.
It is p.