JP2810994B2 - Heat transfer sheet for transmissive manuscript creation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat-transferable sheet for producing a transmission type original. [Prior Art] A thermal recording method of recording desired information by heating a thermal transfer sheet by a thermal head and transferring dyes and the like on the thermal transfer sheet onto the thermal transfer sheet is used as information recording means in various fields. Has been used,
In recent years, it has also been used for creating transmissive originals using a projection device such as an overhead projector (hereinafter abbreviated as OHP). As a heat transfer sheet for preparing a transmission type original used when performing this type of transmission type original creation by a thermal recording method, a conventional polyethylene terephthalate is used.
A sheet-like substrate having a thickness of about 0 μm is provided with a transparent receiving layer for receiving a dye transferred from a thermal transfer sheet on the surface thereof. [Problems to be Solved by the Invention] However, the heat transfer sheet having the above structure has a low density of the transferred image due to the high rigidity of the base sheet, and the transfer of the heat transfer sheet at the time of thermal transfer in the transfer device is performed by the transfer device. In some cases, the printing is not performed smoothly, and as a result, there is a problem in that when printing is performed repeatedly, such as in printing misregistration or color printing, color misregistration occurs. [Means for Solving the Problems] The present invention has been made in view of the above points, and is an object capable of producing a transmissive original having a high print density and free from print misregistration and color misregistration. An object is to provide a thermal transfer sheet. That is, one aspect of the present invention is to provide a transparent resin layer on the surface of a transparent support sheet, and further laminate a transparent receptor layer for receiving a dye migrating from the thermal transfer sheet on the transparent resin layer surface. The gist of the invention is a transmission type heat transfer sheet for producing a document, wherein a back surface material is provided on the back surface of the sheet so as to be detachable. Another aspect of the present invention is:
A transparent resin layer is provided on the surface of the transparent support sheet, and the transparent resin layer further has a transparent sheet having a thickness of 90% or less of the thickness of the support sheet, and a dye transferred from the thermal transfer sheet. And a heat transfer sheet for producing a transmission type original, characterized in that a backing material is provided on the backside of the support sheet in a releasable manner. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a heat transfer sheet for producing a transmission type original according to the present invention comprises a transparent support sheet 1 and a transparent resin layer 2 on the surface thereof.
, And a transparent receiving layer 3 is laminated on the surface of the transparent resin layer 2, and a back material 4 is provided on the back surface of the support sheet 1. As a material of the transparent support sheet 1, a resin having good transparency such as an acrylic resin such as polyethylene terephthalate, polyolefin, polyvinyl chloride, polystyrene, polycarbonate, and polymethyl methacrylate is used, and a material having high heat resistance is preferable. Usually, polyethylene terephthalate is used. The thickness of the support sheet 1 is
30-200μ is preferred. The transparent resin layer 2 lowers the rigidity of the support sheet 1, so that the transfer of the heat transfer sheet in the printing apparatus can be made smooth, and the printing density can be increased by the cushioning property of the transparent resin layer 2. Transparent resin layer 2
Is preferably a resin having a 100% modulus value of 150 kg / cm ² or less.
Vinyl acetate copolymer, acrylic resin, polyvinyl acetate, ethylene-vinyl acetate copolymer, alkyl titanate resin, vinyl acetate-acryl copolymer, polyethylene imine, polyvinyl chloride, polybutadiene, polyethylene, ethylene-acryl copolymer For example, thermoplastic resin such as coalesced resin, polypropylene, ionomer resin, polystyrene and polyurethane elastomer, polyurethane, epoxy resin and the like can be mentioned. If necessary, additives such as a curing agent may be added to the resin. In addition to the above resins, an ultraviolet curable resin, an electron beam curable resin, or the like can be used. The transparent resin layer 2 can be formed of a sticky substance or an adhesive made of the above resin. Examples of a method for forming the transparent resin layer 2 include extrusion coating, hot melt coating, and the like in addition to ordinary solution coating, but the transparent resin layer 2 may be formed by another coating method. The thickness of the transparent resin layer 2 is preferably from 1 to 200 μm. In the present invention, the material constituting the transparent receptor layer 3 is a material capable of receiving an image of a dye migrating from a thermal transfer sheet, for example, a sublimable disperse dye, and maintaining an image formed by the reception. Therefore, any material can be used as long as it is used for the receptor layer of this type of heat transfer sheet, for example, the following (a) to (a)
The synthetic resin (e) can be used alone or in combination of two or more. (A) Those having an ester bond. Polyester resin, polyacrylate resin, polycarbonate resin, polyvinyl acetate resin, styrene acrylate resin, vinyl toluene acrylate resin. (B) Those having a urethane bond. Polyurethane resin and the like. (C) Those having an amide bond. Polyamide resin (nylon). (D) Those having a urea bond. Urea resin and the like. (E) Others having a highly polar bond. Polycaprolactone resin, polystyrene resin, polyvinyl chloride resin, polyacrylonitrile resin, etc. Alternatively, the transparent receiving layer 3 is composed of a mixed resin of a saturated polyester and a vinyl chloride / vinyl acetate copolymer. The vinyl chloride / vinyl acetate copolymer resin preferably has a vinyl chloride component content of 85 to 97% by weight and a degree of polymerization of about 200 to 800. Further, the copolymer may be a copolymer containing only a vinyl chloride / vinyl acetate copolymer component, but may contain a vinyl alcohol component, a maleic acid component and the like. The receiving layer 3 may also be composed of a polystyrene resin, for example, a styrene monomer, for example,
Styrene, α-methylstyrene, polystyrene-based resin consisting of a homo- or copolymer of vinyltoluene, or the styrene-based monomer and other monomers, for example,
Styrene-based copolymer resins which are copolymers with acrylic or methacrylic monomers such as acrylic acid esters, methacrylic acid esters, acrylonitrile, methacrylonitrile, or maleic anhydride. In the present invention, an ultraviolet absorber may be added to the receiving layer 3. By adding an ultraviolet absorber, the light fastness of the dyed dye is further improved. As the ultraviolet absorber, benzophenone type, hindered amine type,
Benzotyrazoles and the like can be mentioned. The addition amount is about 0.05 to 5 parts by weight based on 100 parts by weight of the resin constituting the receiving layer. The heat transfer sheet of the present invention can contain a release agent in the receiving layer 3 in order to improve the releasability from the heat transfer sheet. Solid waxes such as polyethylene wax, amide wax, Teflon powder as release agents,
Silicone oils such as fluorine-based and phosphate-based surfactants and silicone oils are preferred. As the silicone oil, an oily oil can be used, but a curable oil is preferable. Examples of the curable silicone oil include a reaction curable type, a photocurable type, and a catalyst curable type, and a reaction curable type silicone oil is particularly preferable. The reaction-curable silicone oil is preferably one obtained by reacting and curing an amino-modified silicone oil and an epoxy-modified silicone oil. The addition amount of these curable silicone oils is preferably 0.5 to 30 parts by weight based on 100 parts by weight of the resin constituting the receiving layer 3. Alternatively, the release agent may be provided by dissolving or dispersing the release agent in an appropriate solvent on a part or all of the surface of the receiving layer 3, followed by drying and the like. As the release agent constituting the release agent layer, the above-mentioned cured product of the amino-modified silicone oil and the epoxy-modified silicone oil is particularly preferable. The thickness of the release agent layer is preferably 0.01 to 5 μm, particularly preferably 0.05 to 2 μm. The release agent layer may be provided on a part of the surface of the receiving layer 3 or may be provided on the entire surface, but when provided on a part of the surface of the receiving layer, a dot is provided on a portion where the release agent layer is not provided. Impact recording, heat-sensitive melting transfer recording and recording with a pencil etc. can be performed, sublimation transfer recording is performed on the part where the release agent layer is provided, and other recording method is used on the part where the release agent layer is not provided After recording, the sublimation transfer recording method and another recording method can be performed together. On the back surface of the support sheet of the heat transfer sheet of the present invention, a back material 4 is provided so as to be peelable. By providing the back surface member 4, it is possible to improve the paper-passing property of the heat transfer sheet in the printing device at the time of transfer printing. Further, a detection mark for positioning in a printing device at the time of printing can be printed on the back surface material 4. The material of the back surface member 4 may be either transparent or opaque. For example, synthetic paper, cellulose fiber paper, synthetic resin sheet, or the like is used. Examples of the synthetic paper include a type obtained by extruding and stretching a filler in a polyolefin resin, and a type obtained by applying a mixture of a filler and a binder to a polyolefin, polystyrene, or polyester sheet. As the cellulose fiber paper, high-quality paper, coated paper, art paper, cast-coated paper, processed paper impregnated with or coated with a synthetic resin or rubber, or processed paper obtained by extruding and laminating polyethylene or the like can be used. As the synthetic resin sheet, a single transparent film such as polyethylene terephthalate, polypropylene, hard vinyl chloride, etc., a sheet extruded by adding a filler such as clay, calcium carbonate, titanium oxide or the like, or a resin containing the above resin or filler is used. Laminated paper extruded on high-quality paper or the like, or those obtained by forming fine irregularities on the surface thereof by sandblasting, embossing, or the like are used. By further coating the back surface of the back material 4 to provide a slip layer, the paper permeability can be further improved. Examples of the material of the lubricating layer include a methacrylate resin such as methyl methacrylate or a corresponding acrylate resin, and a vinyl resin such as a vinyl chloride-vinyl acetate copolymer. FIG. 2 shows a state in which a transparent resin sheet 5 is laminated on the surface of a transparent resin layer 2 provided on the surface of a transparent support sheet 1 and a transparent receiving layer 3 is further laminated thereon.
2 shows a heat transfer sheet having a structure in which a back material 4 is provided on the back surface. When a transparent sheet 5 is laminated on the surface of the transparent resin layer 2, blocking can be prevented and embossing of the heat transfer sheet can be prevented. The transparent sheet 5 may be directly laminated on the surface of the transparent resin layer 2 or may be laminated via an adhesive. Transparent sheet 5
Has a thickness of 2 to 60μ, particularly preferably 6 to 40μ,
The support sheet 1 is formed to have a thickness of 90% or less, particularly preferably 70% or less. Examples of the material of the transparent sheet 5 include polyethylene terephthalate, polypropylene, cellulose acetate, polyvinyl chloride, ionomer resin, ethylene-vinyl acetate copolymer, polycarbonate, polyether ether ketone, polyphenylene sulfide,
Resins such as polyethersulfone and aramid are exemplified. In order to perform transfer to the heat transfer sheet of the present invention, as shown in FIG. 3, the receiving layer 3 is superimposed on the heat transfer sheet 6 so as to be in contact with the heat transfer layer 7 of the heat transfer sheet 6, and thermal transfer is performed from the base 8 side of the heat transfer sheet 6. Heat with a head or the like. Thereafter, by peeling off the thermal transfer sheet 6, the dye or the like in the thermal transfer layer 7 at the location heated by the thermal head or the like is transferred to the receiving layer 3, and desired information is transferred and recorded on the thermal transfer sheet. As the base material 8 of the thermal transfer sheet,
Condenser paper, polyester film, polyethylene naphthalate film, polystyrene film,
A plastic film such as a polysulfone film, a polyimide film, a polyvinyl alcohol film, a cellophane, or an aramid (aromatic polyamide) film is used, and the thickness is 2 to 50 μm, preferably 2 to 12 μm.
m. These plastic films are preferable because they have a smooth surface and high mechanical strength. Among them, polyester films and aramid films are preferable. The thermal transfer layer 7 is composed of a dye and a binder which are transferred by melting or sublimation by heating. The dye is preferably a sublimable disperse dye, a sublimable oil-soluble dye, or a sublimable basic dye, and has a molecular weight of 150 to 800, preferably 350 to 700. These dyes have sublimation temperature, hue,
It is selected in consideration of weather resistance, solubility in ink or binder resin, and the like, and is, for example, as follows. CI (short for color index, the same applies hereinafter) Yellow 51, 3, 54, 79, 60, 23, 7, 141 CI Disperse Blue 24, 56, 14, 14, 301 3
34, 165, 19, 72, 87, 287, 154, 26 CI Disperse 135, 146, 59, 1, 1
73, 60, 167 CI Detepers Violet 4, 13, 13, 36, 5
6, 31 CI Solvent Violet 13 CI Solvent Black 3 CI Solvent Green 3 CI Solvent Yellow 56, 14, 14, 16, 29 CI Solvent Blue 70, 35, 63, 36, 50,
49, 111, 105, 97, 11 CI Solvent Red 135, 81, 18, 18, 25, 1
9, 23, 24, 14, 146, and 182 As the binder of the thermal transfer layer 7, cellulose resins such as ethyl cellulose, hydroxyethyl cellulose, ethyl hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, cellulose acetate, and cellulose acetate butyrate are used. And vinyl resins such as polyvinyl alcohol, polyvinyl butyral, polyvinyl pyrrolidone, polyester, polyvinyl acetate, and polyacrylamide. The weight ratio of the dye and the binder in the thermal transfer layer 7 is dye /
The binder is desirably 0.3 or more, and if it is less than 0.3, the print density and the thermal sensitivity are insufficient. On the other hand, if the calorific value / binder exceeds 2.3, the retention of the dye in the binder becomes insufficient, and the storage stability of the thermal transfer sheet decreases. Accordingly, the dye / binder content is preferably 0.3 to 2.3, more preferably 0.55 to 1.5. It is desirable that the dye is dissolved in the binder of the thermal transfer layer 7. In a conventional sublimation transfer paper for fabric, since the dye is dispersed in the binder, it is necessary to provide energy that overcomes the interaction between the dye molecules and the interaction between the dye molecule and the binder in order to sublimate the dye. As a result, the thermal sensitivity is reduced as a result of necessarily requiring high energy. In this regard, the fact that the dye is dissolved in the binder is advantageous in terms of heat sensitivity. Further, the back surface of the base material 8 of the thermal transfer sheet 6 can be subjected to a treatment for preventing fusion with a thermal head. Hereinafter, the present invention will be described in more detail with reference to specific examples. In addition, all the formulations shown below are parts by weight. Example 1 75 μ-thick polyester film (Lumirror, manufactured by Toray)
An ink composition 1 for forming a transparent resin layer having the following composition was applied thereon so that the coating amount upon drying was 10 g / m ² . Transparent resin layer forming ink composition 1 Polyurethane resin (Takelac A-712B: Takeda Pharmaceutical) 30 parts Isocyanate curing agent (Takenate A-72B: Takeda Pharmaceutical) 18 parts Ethyl acetate 52 parts The above ink composition 1 was applied. After the surface was dried, a transparent film was formed on this surface by dry laminating a polyester film having a thickness of 12 μm (manufactured by Toray; Lumirror). Next, the following ink composition 1 for forming a transparent receiving layer was applied to the transparent sheet surface so that the coating amount upon drying was 3 g / m ² . Transparent receptor layer forming ink composition 1 Polyester resin (Vylon 200: Toyobo) 70 parts Polyester resin (Vylon 290: Toyobo) 30 parts Amino-modified silicone (KF-393: Shin-Etsu Chemical) 5 parts Epoxy-modified silicone (X -22-343: Shin-Etsu Chemical Co., Ltd. 5 parts Methyl ethyl ketone 350 parts Toluene 350 parts A transparent receiving layer was formed as described above to obtain a heat-transferable sheet for producing a transmission type original. On the other hand, a 4.5μ thick polyester film with a heat-resistant lubricating layer made of thermosetting acrylic resin on one side (Lumirror:
Toray) is used as a substrate, and the coated amount after drying the ink composition for forming a thermal transfer layer having the following composition on the surface opposite to the side on which the heat-resistant lubricating layer is provided is 1 g / m ^2. To obtain a thermal transfer sheet. Cyano ink composition disperse dye for thermal transfer layer formation (Kayaset Blue 714: Nippon Kayaku) 5 parts Polyvinyl butyral resin (ESREC BX-1: Sekisui Chemical) 4 parts Methyl ethyl ketone 46 parts Toluene 45 parts Magenta ink composition for thermal transfer layer formation Disperse dye (MS Red G: manufactured by Mitsui Toatsu Chemicals) (Disperse Red 60) 2.6 parts Disperse dye (Macrolex Violet R: manufactured by Bayer) (Disperse Violet 26) 1.4 parts Polyvinyl butyral resin (ESREC BX-1: Sekisui Chemical) 4.3 parts Methyl ethyl ketone 45 parts Toluene 45 parts Yellow ink composition disperse dye for forming a thermal transfer layer (Macrolex Yellol 6G: manufactured by Bayer) (Disperse Yellow 201) 5.5 parts polyvinyl butyral resin (Eslek BX-1: manufactured by Sekisui Chemical) 4.5 Part: methyl ethyl ketone 45 parts: toluene 45 parts: the above thermal transfer sheet and the above-mentioned heat-transferable sheet for producing a transparent original Using a color video printer having a thermal head with a dot density of 6 dots / mm: VY-50 (manufactured by Hitachi, Ltd.), printing was performed under the following conditions to check for color misregistration. The printing was smoothly performed during printing, and no color shift was observed in all three colors. Next, various heat transfer sheets having transparent resin layers having different thicknesses were prepared, and the results of examining the occurrence of color misregistration in the same manner as described above are shown in Table 1. In addition, the evaluation of the presence / absence of color misregistration was as follows: ・ ・ ・: misalignment within 1/4 dot, ○: misalignment within 1/2 dot. In addition, it prints each color of cyan, magenta, and yellow, and measures the transmission density of each color with a Macbeth color densitometer (TD-904 type)
Table 1 shows the results measured in Table 1. Printing conditions Printing speed: 33.3 ms / line pulse width: 16.0 ms Feed pitch: 0.166 mm Head voltage: 11.0 v Example 2 On the same polyester film as in Example 1, a transparent resin layer forming ink composition 2 having the following composition was applied. Coating amount after drying
It was applied so as to be 8 g / m ² . Transparent resin layer forming ink composition 2 Polyurethane resin (Takelac T-3360: manufactured by Takeda Pharmaceutical Co., Ltd.) 80 parts Toluene 20 parts Next, the same receiving layer forming ink as in Example 1 was formed on the transparent resin layer surface formed as described above. Composition 1 was applied so that the coating amount upon drying was 3 g / m ² to form a receptor layer, and a heat-transfer sheet for preparing a transmission type original was prepared. When printing was performed on this heat-transferred sheet in the same manner as in Example 1, the sheet was fed smoothly, and no color shift occurred. Further, Table 2 shows the results of preparing heat transfer sheets having various thicknesses of the transparent resin layer and examining the occurrence of color misregistration in the same manner as described above. Comparative Example 1 A transparent receiving layer was formed by using the same transparent receiving layer forming ink composition 1 as in Example 1 without providing a transparent resin layer on a 100 μm thick polyester film (Lumilar: manufactured by Toray Industries, Inc.). A heat transfer sheet was used. When printing was performed using this sheet under the same conditions as in Example 1, color misregistration of 2 to 3 dots or more occurred. The transmission densities of cyan, magenta, and yellow in this sheet were cyan: 0.54, magenta: 0.47, and yellow: 0.53, which were significantly lower than those in the case where the transparent resin layer was provided. Example 3 A transparent resin layer was provided on the same polyester film as in Example 1 and a transparent sheet was further laminated, and then dried on the surface of the transparent sheet with an ink composition for forming a transparent intermediate layer having the following composition. Was applied so that the coating amount was 4 g / m ² to form an intermediate layer. Transparent intermediate layer forming ink composition Polyester resin (Vylon 200: Toyobo Co., Ltd.) 25 parts Methyl ethyl ketone 75 parts Further, on the surface of this transparent intermediate layer, using the transparent receiving layer forming ink composition 1 as in Example 1, drying was performed. Later application amount
The receiving layer was formed by coating at 1 g / m ² to obtain a heat transfer sheet. When printing was performed on this heat transfer sheet in the same manner as in Example 1, no color shift was observed. Also, when the thickness of the receiving layer was reduced, a heat-transferable sheet for preparing a transmissive original having more excellent transparency was obtained, and the transmissive original created using this sheet could produce a clearer image when projected by OHP. was gotten. [Effects of the Invention] As described above, the heat-transferable sheet for preparing a transmission type original of the present invention reduces the rigidity of the support sheet by providing the transparent resin layer on the surface of the transparent support sheet, and reduces the rigidity of the support sheet. By providing the back surface material on the back surface in a peelable manner, it is possible to improve the paper-passing property of the heat transfer sheet in the printing apparatus at the time of transfer printing, and as a result, the feeding of the heat transfer sheet in the printing apparatus becomes smooth and the feeding unevenness is increased. There is no print shift or color shift caused by the above, and the print density is increased by the cushioning action of the transparent resin layer, so that a clear image can be printed by thermal transfer. In addition, by providing a transparent sheet having a thickness of 90% or less of the thickness of the support sheet on the surface of the transparent resin layer, it is possible to prevent blocking and embossing of the sheet, so that a beautiful transmission type document can be provided. Has the effect of being able to create

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of the heat transfer sheet of the present invention. FIG. 2 shows the present invention in which a transparent sheet is further provided on the surface of a transparent resin layer. Vertical cross-sectional view of the heat transfer sheet,
FIG. 3 is a longitudinal sectional view showing a state in which transfer is performed using the heat transfer sheet of the present invention. DESCRIPTION OF SYMBOLS 1 ... Support sheet, 2 ... Transparent resin layer 3 ... Transparent receiving layer, 5 ... Transparent sheet

   ────────────────────────────────────────────────── ─── Continuation of front page       (56) References JP-A-61-106293 (JP, A)                 JP-A-61-144394 (JP, A)                 JP-A-60-19588 (JP, A)                 Shokai Sho 61-171048 (JP, U)                 61-204767 (JP, U)                 62-965 (JP, U)                 Actual opening sho 62-20850 (JP, U)

Claims (1)

(57) [Claims] A transparent resin layer is provided on the surface of the transparent support sheet, and a transparent receiving layer for receiving a dye transferred from the thermal transfer sheet is further laminated on the transparent resin layer surface, and a back material is provided on the back surface of the support sheet. A heat-transferable sheet for producing a transmissive original, which is provided so as to be peelable. 2. 2. The heat transfer sheet according to claim 1, wherein the resin constituting the transparent resin layer is a thermoplastic resin. 3. 2. The heat transfer sheet for preparing a transmission type original according to claim 1, wherein the transparent resin layer is formed of an adhesive substance. 4. 2. The heat-transferable sheet according to claim 1, wherein the transparent resin layer is formed with an adhesive. 5. 5. The heat-transferable sheet according to claim 1, wherein the resin constituting the transparent resin layer has a 100% modulus of 250 kg / cm ² or less. 6. 6. The heat-transferable sheet for producing a transmission type original according to claim 1, wherein the thickness of the transparent resin layer is 1 to 200 [mu]. 7. 7. The heat-transferable sheet for producing transmissive originals according to claim 1, wherein the thickness of the transparent support sheet is 30 to 200 [mu]. 8. Claim 1 wherein the transparent receiving layer contains a release agent.
Item 8. The heat-transfer sheet for producing a transmission type original according to any one of Items 7 to 7. 9. 8. The heat-transferable sheet for producing a transmissive original according to claim 1, wherein a release agent layer is provided on a part or the entire surface of the transparent receiving layer. 10. A transparent resin layer is provided on the surface of the transparent support sheet, and the transparent resin layer further has a transparent sheet having a thickness of 90% or less of the thickness of the support sheet, and a dye transferred from the thermal transfer sheet. And a transparent receiving layer is sequentially laminated, and a backing material is provided on the backside of the support sheet so as to be releasable. 11. 11. The heat-transferable sheet for producing transmissive originals according to claim 10, wherein the resin constituting the transparent resin layer is a thermoplastic resin. 12. 11. The heat transfer sheet for producing a transmission type original according to claim 10, wherein the transparent resin layer is formed of an adhesive substance. 13. 11. The heat transfer sheet for producing a transmission type original according to claim 10, wherein the transparent resin layer is formed with an adhesive. 14． Claims 10 to 13 wherein the value of the 100% modulus of the resin constituting the transparent resin layer is 250 kg / cm ² or less.
Item 6. The heat-transferable sheet for producing a transmission-type original according to any one of the above items. 15. 15. The heat transfer sheet according to claim 10, wherein the thickness of the transparent resin layer is 1 to 200 μm. 16. 16. The heat transfer sheet for preparing a transmission type original according to claim 10, wherein the thickness of the transparent support sheet is 30 to 200 μm. 17． Claims wherein the transparent receiving layer contains a release agent
Item 17. The heat-transfer sheet for producing a transmission-type original according to any one of Items 10 to 16. 18. 18. The heat transfer sheet for preparing a transmissive original according to claim 10, wherein a release agent layer is provided on a part or the entire surface of the transparent receiving layer. 19. 19. The heat-transferable sheet for producing a transmission-type original according to claim 10, wherein the thickness of the transparent sheet is 2 to 60 [mu].