JPH10250247A - Thermal transfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prohibit frictional force from being varied at the time of scrubbing with a thermal transfer image receiving sheet, and prevent color missing and positional dislocation of imaged matter even in a simple printer of an inexpensive structure, by providing a coloring material layer on the whole surface of a base material sheet without any blank space. SOLUTION: Two line detection marks 2 are put on one surface of a base material sheet 3 at right angles at constant distance with respect to the flow direction. One color agent layer 1 is spread over the entire surface of the base material sheet 3 without leaving margins in a manner covering the detection marks 2. One detection mark 2 is put on the base material sheet 3 at right angles at constant distance with respect to the flow direction. Then, a coloring material layer 11 is set covering the detection mark 2, and a coloring material layer 12 is provided adjacent to the coloring material layer 11, and further a coloring material layer 13 is also provided contiguous to the coloring material layer 12 without leaving margins, followed by providing three color material layers 11-13 successively iterately. As such, frictional force does not vary at the time of scrubbing with a thermal transfer sheet, thus color missing or positional dislocation can be prevented even in a printer of an inexpensive structure. In addition, the detection mark 2 can be detected positively, and the image forming initiation position matches correctly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer sheet, and more particularly to a thermal transfer sheet provided with a color material layer on a base sheet to prevent wrinkles and meandering during printing, thereby forming an excellent image on the thermal transfer image receiving sheet. It relates to a possible thermal transfer sheet.

[0002]

2. Description of the Related Art Conventionally, a monotone image such as a gradation image, a character, a symbol, or the like has been formed on a transfer target using a thermal transfer method. As the thermal transfer method, a sublimation transfer method and a thermal fusion transfer method are widely used. In the sublimation transfer method, a thermal transfer sheet in which a base material sheet carries a dye layer in which a sublimable dye used as a coloring material is dissolved or dispersed in a binder resin is superimposed on a transfer target, and heated by a thermal head or a laser. By applying energy according to the image information by means, the dye contained in the sublimable dye layer on the thermal transfer sheet is transferred to the transfer target to form an image. In this sublimation transfer method, the amount of energy transferred to the thermal transfer sheet can control the dye transfer amount in dot units, so that a full-color image with gradation can be formed and a high-quality image comparable to a silver halide photograph image can be formed. High quality images can be obtained. Therefore, the sublimation transfer system has attracted attention and is used as an information recording unit in various fields.

[0003] Due to the development of various hardware and software related to multimedia, this thermal transfer method can be used for computer graphics, satellite communication still image and C / C.
The market is expanding as a full-color hard copy system for analog images such as digital images and videos such as D-ROMs and the like. The specific application of the transfer object by this thermal transfer method is wide-ranging. Typical examples are proof printing, image output, and CAD.
/ Design and output of CAM, etc., various medical analysis equipment such as CT scan and endoscope camera, output use of measurement equipment and as an alternative to instant photography, as well as identification cards, ID cards, credit cards, etc. Outputs such as a photo of a face of a card and the like, as a composite photograph in an amusement facility such as an amusement park, a game center, a museum, an aquarium, and a use as a commemorative photograph can be given.

In such a versatile transfer medium, not only a full-color image but also a mono-color image such as a sepia hue is produced by sublimation transfer recording. In the thermal transfer sheet for forming a monocolor image, in the sublimation transfer recording system, generally, as shown in FIG. 5, a dye layer 1, which is a monocolor coloring material layer, is provided at regular intervals with four margins. In addition, a detection mark 2 for cueing is provided in the four margins. In the image forming process, the thermal transfer sheet is wound around a supply bobbin, and one end of the thermal transfer sheet at the end of winding is wound up with a winding bobbin. In a pair of rolls, the thermal transfer sheet is wound around a winding bobbin. The sensor is transported in the direction, and the detection mark is read by the sensor. When the reading is detected, the thermal transfer sheet is temporarily stopped, and the thermal head presses and heats so that the dye is transferred to the thermal transfer image receiving sheet via the thermal transfer sheet, thereby forming an image on the thermal transfer image receiving sheet. At this time, the size of the dye layer has an area corresponding to the size of one screen on which an image is formed (slightly larger than the size of one screen).

When the image formation is completed, the thermal head separates from the thermal transfer sheet, and the thermal transfer sheet stops. Since high heat is applied to the thermal transfer sheet by the thermal head, the heating section is likely to be deformed. However, as shown in FIG. 5, the cue detection mark is separated from the dye layer, and the deformed heating section and the dye layer used for next image formation are separated from each other by a distance. The next image formation is not affected.

[0006]

However, in the conventional monocolor thermal transfer sheet as described above, there is a blank space between the color material layer and the adjacent color material layer, and the space between the color material layer and the receiving layer surface of the thermal transfer image receiving sheet. A phenomenon occurs in which the frictional force (friction coefficient) when the thermal transfer image receiving sheet and the thermal transfer sheet are rubbed fluctuates between the colorant layer portion and the blank portion when the thermal transfer sheet comes in contact with and overlaps the color material layer surface. At this time, if the thermal transfer printer is an expensive high-end model, control the fluctuation of its frictional force,
Although it is possible to prevent image formation from being affected, a simple printer with an inexpensive structure cannot control fluctuations in the frictional force, and wrinkles occur on the thermal transfer sheet during image formation, causing color loss on the image. And the image receiving sheet meanders, resulting in image displacement. Further, since the above-described inexpensive simple printers are used more frequently in the market than expensive high-end models, there is a need for a thermal transfer sheet and a thermal transfer image-receiving sheet that can be used safely with a printer having a simple structure. .

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to change the frictional force (friction coefficient) when a thermal transfer image receiving sheet and a thermal transfer sheet are rubbed. Another object of the present invention is to provide a thermal transfer sheet that can prevent color loss and misregistration of an image even with a simple printer having a low-cost structure.

[0008]

According to the present invention, there is provided a thermal transfer sheet having at least one color material layer and a detection mark on one surface of a base material sheet, wherein the color material layer has a margin on the base material sheet. In addition, the above-mentioned problem could be solved by being provided on the entire surface of the base sheet. Further, in the present invention, it is preferable that the color material layer is one color. Preferably, the detection mark is covered with a coloring material layer.

[0009]

The present invention relates to a thermal transfer sheet having at least one color material layer and a detection mark on at least one surface of a base material sheet, wherein the color material layer has no margin on the base material sheet, Since there is no margin on the color material layer surface of the thermal transfer sheet, the receiving layer surface of the image receiving sheet comes into contact with the color material layer surface of the thermal transfer sheet, and the frictional force (coefficient of friction) when rubbing varies. Can be prevented. Therefore, the thermal transfer sheet may be wrinkled due to a change in the frictional force (friction coefficient), causing the image to be discolored, or the image receiving sheet meandering, resulting in image displacement. Can be eliminated. Further, by using one color material layer, an excellent monocolor image can be formed. In addition, by covering the detection mark with the color material layer, the above-described fluctuation of the frictional force (friction coefficient) can be further reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION On one surface of a substrate sheet of a thermal transfer sheet of the present invention, at least one color material layer and a detection mark are provided, and the color material layer has no margin on the substrate sheet. An embodiment provided on the entire surface of the base sheet will be described with reference to the drawings. FIG. 1 shows an embodiment of the thermal transfer sheet of the present invention, in which two lines of detection marks 2 are provided at regular intervals at right angles to the flow direction, and one color material layer 1 is formed on the base of the thermal transfer sheet. It is provided on the entire surface of the material sheet.
FIG. 2 is a cross-sectional view of the thermal transfer sheet of FIG. 1. A two-line detection mark 2 is provided on a base sheet 3, and a color material layer 1 of one color is formed so as to cover the detection mark 2. Material sheet 3
Is provided on the entire surface of the base sheet 3 without any margin.

FIG. 3 shows another embodiment of the thermal transfer sheet according to the present invention, in which a single line detection mark 2 is provided at a certain interval at right angles to the flow direction, and three color material layers 11 are provided. , 12, and 13 are provided face-to-face, and the color material layer is provided on the entire surface of the base sheet without any blanks on the base sheet. FIG. 4 is a cross-sectional view of the thermal transfer sheet of FIG. 3, in which a single-line detection mark 2 is provided on a base sheet 3, and among the three color material layers, the detection mark 2 is covered. 11
Color material layer is formed, 12 color material layers are provided next to 11 color material layers without blank space, 13 color material layers are provided next to 12 color material layers without blank space, and 13 color material layers are provided. The color material layers 11, 12, 1 and 3 of the three colors are provided next to the color material layers without any blank space.
3 has a form in which it is repeatedly provided in a plane sequence.

Next, the structure of the thermal transfer sheet of the present invention will be described. (Base Sheet) The base sheet 3 may be any sheet as long as it has a conventionally known degree of heat resistance and strength. Specific examples of preferred base sheet 3 include glassine paper,
Thin paper such as condenser paper and puffin paper, high heat-resistant polyester such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyphenylene sulfide, polyether ketone, polyether sulfone, polypropylene, polycarbonate,
Cellulose acetate, derivatives of polyethylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyamide,
Examples include stretched or unstretched films of plastics such as polyimide, polymethylpentene, and ionomer, and laminates of these materials. The thickness of the base sheet 3 can be appropriately selected depending on the material so that the strength and heat resistance are appropriate, but is usually 1 to 100 μm.
m is preferably used.

(Coloring Material Layer) The coloring material layer 1 of the thermal transfer sheet of the present invention is roughly classified into two types, a sublimation transfer type and a heat melting transfer type.
The sublimation transfer type is a gravure printing method, a screen printing method, and a reverse roll using a gravure plate, in which a sublimable dye, a binder resin, and other optional components are added to an appropriate solvent, and each component is dissolved or dispersed. The coating is applied onto the base sheet 3 by a forming means such as a coating method and dried to form the base sheet 3. The thickness of the color material layer 1 can be about 0.2 to 5 μm in a dry state, preferably about 0.4 to 2 μm, and the content of the sublimable dye in the color material layer 1 is 5 μm.
To 90% by weight, preferably about 10 to 70% by weight.

As the sublimable dye to be used, any of the sublimable dyes used in a conventionally known sublimation transfer type thermal transfer sheet can be effectively used in the present invention, and is not particularly limited.
Specifically, for example, as the yellow dye, Holon Brilliant Yellow S-6GL, PTY-52, Macrolex Yellow 6G, and the like are listed, and as the red dye, MS is used.
Red, Macrolex Red Violet R, Celes Red 7B, Samarone Red HBSL, SK Rubin SE
GL, etc., and further, as the blue dye, Kayaset Blue 714, Waxolin Blue AP-FW, Holon Brilliant Blue SR, MS Blue 100, Daito Blue No. 1 and the like. Further, a color material layer of an arbitrary hue such as black can be formed by combining the above-described sublimable dyes of each hue.

As the binder resin for supporting the sublimable dye as described above, any of conventionally known binder resins can be used. Preferred examples thereof include ethyl cellulose,
Cellulose resins such as hydroxyethylcellulose, ethylhydroxycellulose, hydroxypropylcellulose, methylcellulose, cellulose acetate, and cellulose acetate butyrate; vinyl resins such as polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyvinyl pyrrolidone, and polyacrylamide; polyester And the like. In the thermal transfer sheet of the present invention, as shown in FIGS. 2 and 4, the color material layer may have not only a single-layer structure but also a two-layer structure or a multi-layer structure of three or more layers. When the color material layer has two or more colors, the color material layers of the respective colors may have both a single-layer structure and a multi-layer structure.

According to the present invention, in a thermal transfer sheet having at least one color material layer of at least one color and a detection mark on one surface of the base material sheet, the color material layer has no margin on the base material sheet.
Since it is provided on the entire surface of the base material sheet, there is no margin on the color material layer surface of the thermal transfer sheet, and the receiving layer surface of the image receiving sheet and the color material layer surface of the thermal transfer sheet come into contact with each other and the friction force (friction coefficient) when rubbing Is prevented from fluctuating. The coloring material layer of the thermal transfer sheet rubs with the receiving layer of the image receiving sheet, and in order to reduce the frictional force, an inorganic or organic filler is added to the coloring material layer forming ink, and the surface of the coloring material layer is matted. It is preferable to make Examples of the inorganic filler added to the color material layer include, for example, talc, clay, kaolin, calcium carbonate, magnesium carbonate, precipitated barium sulfate, hydrotalcite, silica, carbon, and the like. Anything is good.

The organic filler contained in the color material layer may be any organic filler having good wettability with the color material layer forming ink. Organic fillers, for example, as a polymer composition, phenolic resin, melamine resin, urethane resin, epoxy resin, silicone resin, urea resin, diallyl phthalate resin, alkyd resin, acetal resin, acrylic resin, methacrylic resin, polyester resin, cellulose Resin, starch and its derivatives, polyvinyl chloride, polyvinylidene chloride, chlorinated polyethylene, fluororesin,
Polyethylene, polypropylene, polystyrene, polyvinyl acetal, polyamide, polyvinyl alcohol,
Polycarbonate, polysulfone, polyethersulfone, polyphenylene oxide, polyphenylene sulfide, polyetheretherketone, polyaminobismaleimide, polyarylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyimide, polyamideimide, polyacrylonitrile, AS resin, ABS resin , SBR and a filler of a composition mainly composed of these.

Representative combinations of organic filler and ink for forming a colorant layer having good wettability include organic fillers such as polyethylene filler and Fischer-Tropsch wax using polyvinyl acetoacetal as a binder resin. When the average particle size of the inorganic or organic filler is in the range of 2 μm to 10 μm, the surface of the color material layer becomes uneven, and the filler is formed by the color material layer forming ink.
It is completely covered, adjusts the frictional force with the receiving layer of the image receiving sheet, and does not cause defects such as pinholes in the image forming portion.

When the average particle size of the filler is less than 2 μm, the filler is buried in the coloring material layer, and the surface of the coloring material layer is unlikely to be uneven. The average particle size of the filler is 1
If the thickness exceeds 0 μm, the surface of the unevenness of the color material layer is not covered with the color material layer forming ink, even with a filler having good wettability with the color material layer forming ink. The content of the filler is preferably 1% to 20% with respect to the binder resin. If the content is less than 1% outside this range, blocking occurs in the rolled storage state of the thermal transfer sheet. When an image is formed by superimposing image receiving sheets, an image object with color misregistration occurs due to slippage.

As another color material layer, there is a hot-melt transfer type. The color material layer is composed of a colorant and a binder, and any additives may be added as needed. The thickness of the hot-melt transfer type color material layer, the compounding ratio of the colorant, and the forming method are the same as those of the sublimation transfer type color material layer. As the above-mentioned coloring agent, among organic or inorganic pigments or dyes, those having good characteristics as a recording material, for example, those having a sufficient coloring density, and those which do not discolor by light, heat, temperature, etc. preferable. As a coloring agent, cyan,
Magenta and yellow can be used, but a black colorant is preferably used. As a binder to be used, wax as a main component, in addition to drying oil, resin,
Mixtures such as derivatives of mineral oil, cellulose and rubber are used.

Examples of the wax include microcrystalline wax, carnauba wax, paraffin wax and the like. Furthermore, various types such as Fischer-Tropsch wax, various low molecular weight polyethylenes, wood wax, beeswax, spermaceti, Ibota wax, wool wax, shellac wax, candelilla wax, petrolactam, polyester wax, partially modified wax, fatty acid ester, fatty acid amide, etc. Is used. In the case of the present invention, the binder used for the colored transfer layer is a vinyl chloride-vinyl acetate copolymer resin, or an acrylic resin, or a chloride rubber to an acrylic resin, a vinyl chloride-vinyl acetate copolymer resin,
It is more preferable to use at least one kind of cellulosic resin.

(Detection Mark) The detection mark 2 provided on the thermal transfer sheet of the present invention indicates the start position of the thermal transfer image formation. The shape and color of the detection mark 2 are not limited as long as they can be detected by a detector (sensor). Examples of the shape include a two-line stripe as shown in FIG. 1, a one-line stripe as shown in FIG. 3, and a quadrangle, a round shape, and the like at a partial position not extending over the entire width of the thermal transfer sheet. However, since the detection mark 2 indicates the start position of the thermal transfer image formation, when the color material layer is one color, the detection mark 2 is formed for each length corresponding to one screen, and the color material layer is formed. In the case of two or more colors, it is preferable that the detection mark is formed at all the leading positions of the color material layers provided in the face-sequential manner or only at the first color of the face-sequential unit.

It is sufficient that the color of the detection mark can be detected by a detector. For example, in the case of a light transmission type detector, silver, black or the like having a high concealing property can be used. Further, in the case of a light reflection type detector, a color tone of highly reflective metallic luster or the like may be used. However, when the light reflection type detector is used, if the detection mark is covered with the color material layer, the reflection characteristic of the detection mark surface is impaired. It is necessary that the detection marks are stacked in this order and the detection marks exist on the outermost surface of the thermal transfer sheet. The detection mark can be formed by a known printing method such as gravure printing or offset printing, provided by hot stamping with a transfer foil of a vapor-deposited film, or pasting a colored film with an adhesive or a vapor-deposited film on the back surface. It is also possible and not particularly limited.

(Back Layer) In the thermal transfer sheet of the present invention, a back layer can be provided on the back surface of the base sheet 3. The back layer provided on the back surface of the base sheet 3 prevents thermal fusion between a heating device such as a thermal head and the base sheet 3,
It is provided for the purpose of smooth running. As the resin used for the back layer, for example, cellulose resins such as ethyl cellulose, hydroxy cellulose, hydroxypropyl cellulose, methyl cellulose, cellulose acetate, cellulose acetate butyrate, nitrocellulose, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, Vinyl resins such as polyvinylpyrrolidone, acrylic resins such as polymethyl methacrylate, polyethyl acrylate, polyacrylamide, acrylonitrile-styrene copolymer, polyamide resins, polyvinyl toluene resins, coumarone indene resins, polyester resins, polyurethane A simple substance or a mixture of natural or synthetic resins such as resin, silicone-modified or fluorine-modified urethane is used. Of the above-mentioned resins to further increase the heat resistance of the back layer, a resin having a hydroxyl group-based functional group is used, and a polyisocyanate or the like is used in combination as a cross-linking agent to form a cross-linked resin layer. preferable.

Further, in order to impart slidability to the thermal head, a solid or liquid release agent or lubricant may be added to the back surface layer to impart heat-resistant lubrication. As the release agent or lubricant, for example, polyethylene wax, various waxes such as paraffin wax, higher fatty acid alcohol,
Organopolysiloxane, anionic surfactant, cationic surfactant, amphoteric surfactant, nonionic surfactant, fluorine surfactant, organic carboxylic acid and its derivatives, fluorine resin, silicone resin, talc, Fine particles of an inorganic compound such as silica can be used.
The amount of the lubricant contained in the back layer is 5 to 50% by weight, preferably about 10 to 30% by weight. The thickness of such a back layer is about 0.1 to 10 μm, preferably 0.5 to 5 μm.
m.

(Image-Receiving Sheet) The image-receiving sheet used for forming an image by using the above-mentioned thermal transfer sheet, in the case of a sublimation transfer type, has an image-receiving surface having a dye-accepting property with respect to the above-mentioned dye. Anything is fine,
In the case of paper, metal, glass, synthetic resin or the like having no dye receptivity, a dye receiving layer may be formed on at least one surface thereof. Examples of the transfer object that does not need to form a dye receiving layer include, for example, polyolefin resins such as polypropylene, polyvinyl chloride, halogenated polymers such as polyvinylidene chloride, polyvinyl acetate, vinyl polymers such as polyacrylester, Polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polystyrene resins, polyamide resins, copolymer resins of olefins such as ethylene and propylene with other vinyl monomers, ionomers, cellulose resins such as cellulose diacetate, polycarbonate And the like, fibers, woven fabrics, films, sheets, molded products and the like. Particularly preferred is a sheet or film made of polyvinyl chloride, which may have a single-layer or multilayer laminate structure.

In the present invention, even if the transfer surface of paper, metal, glass or other non-dyeable transfer material is used, the recording surface is coated with the solution or dispersion of the above-described dyeable resin or dried.
Alternatively, an image receiving sheet can be obtained by laminating those resin films. Further, even in the case of the above-mentioned transferable body having dyeing properties, the dye-receiving layer may be formed on the surface thereof from a resin having better dyeing properties as described above. The dye-receiving layer thus formed may be formed from a single material, or may be formed from a plurality of materials, and may further include various additives within a range not to impair the object of the present invention. Is natural.

Next, in the case of a hot-melt transfer type image-receiving sheet, the transferability of a color material layer is improved and fixed on a base material, if necessary, using plain paper, synthetic paper, resin film or the like as a base material. A receiving layer can be provided for improving the properties and the like. To form the receiving layer, the above-described resin and various additives are dissolved or dispersed in an appropriate solvent to prepare an ink for forming a receiving layer, and the ink is formed on the surface of the recording material. For example, it can be formed by applying and drying by a forming means such as a gravure printing method, a screen printing method, and a reverse coating method using a gravure plate. As a means for applying thermal energy during thermal transfer, any conventionally known means for applying heat can be used. For example, the recording time is controlled by a recording device such as a thermal printer (for example, a video printer VY-100 manufactured by Hitachi, Ltd.). By doing so, the intended purpose can be sufficiently achieved by applying thermal energy of about 5 to 100 mJ / mm ² .

[0029]

The present invention will be described below in detail with reference to Examples and Comparative Examples. In the following description, parts or% are based on weight unless otherwise specified. (Example 1) As a substrate sheet, 6 μm thick polyethylene terephthalate whose back surface was subjected to a heat-resistant treatment was applied as shown in FIGS.
In the position as shown in the figure, a detection mark of the following composition is formed by gravure printing with a coating amount of 0.7 g / m ² at the time of drying, and the entire surface of the base sheet is covered with the following composition so as to cover the detection mark. The color material layer is provided so as to be 1.5 g / m ² when dried,
A thermal transfer sheet of Example 1 was prepared.

[0030]Coating liquid for detection mark Carbon black 8.0 parts Urethane resin (HMS-20: Nippon Polyurethane Co., Ltd.) 15.0 parts Methyl ethyl ketone 38.5 parts Toluene 38.5 parts Coating liquid for color material layer 1 2.61 parts of yellow disperse dye (CI Disperse Yellow 6G: Bayer Corp.) 1.77 parts of magenta disperse dye (KC-27: Konica Corporation) 3.31 parts of cyan disperse dye (CI) Solvent Blue 63: Nippon Kayaku Co., Ltd.) Polyvinyl butyral (Eslec BX-1: Sekisui Chemical) 20 parts Toluene 30 parts Methyl ethyl ketone 30 parts

(Example 2) As a base sheet, a 6 μm-thick polyethylene terephthalate with a heat-resistant treatment on the back surface was applied to the position shown in FIGS. With gravure printing, dry 0.7
The detection marks are formed with a coating amount of g / m ² , and as shown in FIGS. The thermal transfer sheet of Example 2 was prepared so as to be 1.5 g / m ² .

Coloring material layer coating liquid 2 Disperse dye (Holone Brilliant Yellow 6GL) 3.5 parts Polyvinyl acetoacetal resin 3.5 parts (KS-5: Sekisui Chemical Co., Ltd.) Polyethylene filler 0.1 part ( Microfine MF8F: Astor Wax Co., Ltd. Methyl ethyl ketone 46.5 parts Toluene 46.5 parts

Coloring material layer coating liquid 3 Disperse dye (MS RED G) 3.5 parts Polyvinyl acetoacetal resin 3.5 parts (KS-5: Sekisui Chemical Co., Ltd.) Polyethylene filler 0.1 part (Micro Fine MF8F: Astor Wax Co., Ltd. Methyl ethyl ketone 46.5 parts Toluene 46.5 parts

Colorant layer coating solution 4 Disperse dye (Kayaset Blue 714 3.5 parts polyvinyl acetoacetal resin 3.5 parts (KS-5: Sekisui Chemical Co., Ltd.) Polyethylene filler 0.1 part (micro Fine MF8F: Astor Wax Co., Ltd. Methyl ethyl ketone 46.5 parts Toluene 46.5 parts

(Comparative Example 1) As a substrate sheet, a color material layer used in Example 1 was provided on a 6 μm-thick polyethylene terephthalate having a heat-treated rear surface with a space as shown in FIG. 1.5 g / m when dried with coating liquid 1
^Then , a color material layer was formed so as to be ² and the coating solution for detection mark used in Example 1 was dried by gravure printing to obtain a coating material having a thickness of 0.
A thermal transfer sheet of Comparative Example 1 was prepared by providing a detection mark in a blank portion at a coating amount of 7 g / m ² as shown in FIG.

Thermal transfer sheets of the above Examples and Comparative Examples
And a thermal transfer image-receiving sheet under the following conditions,
So that they come in contact with each other, the Sony UP-D88
Use a 00 printer to perform thermal transfer image formation
Was. However, for the example and the comparative example, 10 sheets of heat were used.
Perform 10 continuous prints using a transfer image receiving sheet
Was. Thermal transfer image receiving sheet Synthetic paper as base material (Yupo FPG1 manufactured by Oji Yuka Co., Ltd.)
50) On one side, a reverse coater using a gravure plate
The coating amount of the receiving layer coating solution of the following composition is dried by the
4.5 g / m^Two Apply and dry with heat transfer image receiving sheet
Was prepared.

Coating liquid for receiving layer Polyester resin (Viron 600: Toyobo Co., Ltd.) 4.0 parts Vinyl chloride / vinyl acetate copolymer resin 6.0 parts (# 1000A: Denki Kagaku Kogyo Co., Ltd.) Amino modified Silicone oil 0.2 parts (X-22-3050C: Shin-Etsu Chemical Co., Ltd.) Epoxy modified silicone oil 0.2 parts (X-22-3000E: Shin-Etsu Chemical Co., Ltd.) Methyl etiketone 44.8 parts Toluene 44.8 copies

In the image formation described above, the presence or absence of color loss or displacement of the obtained image was visually evaluated. The evaluation criteria are as follows. Image quality ○: good without color loss or misalignment of the image. X: Discoloration or misregistration occurred in the image, resulting in a defect.

Further, the thermal transfer sheets of the above Examples and Comparative Examples and the thermal transfer image-receiving sheet under the above conditions were superimposed on each other so that the color material layer and the receptor layer were in contact with each other.
The dynamic friction coefficient was measured according to 1894. In the case of Comparative Example 1, the coefficient of kinetic friction between the blank portion of the thermal transfer sheet without the color material layer and the receiving layer was measured. In the case of Examples 1 and 2, the dynamic friction coefficient between the color material layer and the receiving layer of the thermal transfer sheet was measured. The dynamic friction coefficient was measured.

(Evaluation Results) The above evaluation results are shown in Table 1 below.
Shown in

[Table 1]

[0041]

According to the present invention, as described above,
In a thermal transfer sheet having at least one color material layer and a detection mark on at least one surface of the base material sheet, the color material layer is provided on the entire surface of the base material sheet without blanks on the base material sheet. In addition, the frictional force (friction coefficient) when the thermal transfer image-receiving sheet and the thermal transfer sheet are rubbed does not fluctuate, and even a simple printer having an inexpensive structure can prevent discoloration and misalignment of the image. Further, in the thermal transfer sheet of the present invention, the detection mark can be reliably detected by the detector, and the start position of the thermal transfer image formation can be accurately matched.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a thermal transfer sheet of the present invention.

FIG. 2 is a sectional view of the thermal transfer sheet of FIG.

FIG. 3 is a plan view showing another embodiment of the thermal transfer sheet of the present invention.

FIG. 4 is a cross-sectional view of the thermal transfer sheet of FIG.

FIG. 5 is a plan view showing an example of a conventional thermal transfer sheet.

[Description of Signs] 1, 11, 12, 13 Color material layer (dye layer) 2 Detection mark 3 Base sheet 4 Margin

Claims (3)

[Claims] At least one substrate is provided on one surface of a base sheet.
A thermal transfer sheet having a color material layer having more than a color and a detection mark, wherein the color material layer is provided on the entire surface of the base sheet without any margin on the base sheet. 2. The thermal transfer sheet according to claim 1, wherein the color material layer has one color. 3. The thermal transfer sheet according to claim 1, wherein the detection mark is covered with a color material layer.