TWI724244B - Thermal transfer sheet - Google Patents

Abstract

The present invention provides a thermal transfer sheet that can inhibit the thermal fusion of the transfer body and the thermal transfer sheet in the printer even when the heat energy applied to the thermal transfer sheet is extremely high. The above-mentioned problems can be solved by the following thermal transfer sheet (100). The thermal transfer sheet (100) is a substrate (1) provided with a transfer layer (10) on one side of the substrate (1). Sheet feeding mechanism (201), heating mechanism (202), thermal transfer sheet winding mechanism (203), measuring mechanism (204) located between heating mechanism (202) and thermal transfer sheet winding mechanism (203), The printer (200) of the peeling mechanism (205) located between the heating mechanism (202) and the measuring mechanism (204) is applied with an applied energy of 0.177mJ/dot and a transfer speed of the thermal transfer sheet (100) 28.2mm/ Under the condition of sec., while transferring the transfer layer (10) on the transferred body (300), while transferring the transfer layer (10) on the transferred body (300) at a peeling angle of 50° The tensile strength measured by the measuring mechanism (204) at the time when the thermal transfer sheet (100) was peeled off was 0.29 N/cm or less.

Description

Thermal transfer sheet

[0001] The present invention relates to a thermal transfer sheet.

[0002] Various forms of thermal transfer sheets for transferring a transfer layer to a body to be transferred are known. For example, as proposed in Patent Documents 1 to 3, (i) is provided on one surface of a substrate as The thermal transfer sheet of the hot melt ink layer of the transfer layer, (ii) The thermal transfer sheet (sometimes referred to as the intermediate transfer medium) as the receiving layer of the transfer layer is arranged on one surface of the substrate, (iii) ) A thermal transfer sheet (sometimes also called a protective layer transfer sheet) is provided as a protective layer (sometimes called a release layer) as a transfer layer on one surface of the substrate, (iv) the composition is appropriate The combined thermal transfer sheet, for example, is known for thermal transfer of a transfer layer formed by sequentially laminating a release layer and a receiving layer on one side of the substrate. Sheets, or thermal transfer sheets with a hot melt ink layer and a protective layer arranged on the same surface of the substrate in order. In addition, a thermal transfer sheet in which a receiving layer and a concealing layer are sequentially laminated on a substrate as proposed in Patent Document 4 (a laminate of the receiving layer and the concealing layer becomes the transfer layer) is known. According to the thermal transfer sheet proposed in Patent Document 4, by transferring the transfer layer to the transferred body, a thermal transfer imaging sheet with the receiving layer on the outermost surface can be obtained. The transfer layer of these thermal transfer sheets is transferred to the transferred body by overlapping the transferred body and the thermal transfer sheet, and the other side of the substrate is heated by a heating mechanism such as a heating head or a heating roller. on. [0003] Recently, the market for printers with excellent high-speed printability has become more demanding, and the thermal transfer sheet is applied to the thermal transfer sheet when the transfer layer is transferred to the body to be transferred toward the inside of the printer. Energy (sometimes called heat or applied energy, etc.) increases one way. In addition, as a printer used for transferring the transfer layer of a thermal transfer sheet, it is known, for example, to apply energy to the thermal transfer sheet to melt or soften the transfer layer. Before the transfer layer is solidified, only the transferred layer is transferred. A printer that uses a thermal peeling method in which the transfer layer printed on the body is peeled from the thermal transfer sheet, and after the transfer layer is cured, only the transfer layer that has been transferred on the body is transferred A printer with a cold peeling method that peels off the thermal transfer sheet. [0004] The transfer of the transfer layer to the body to be transferred is in a state where the body to be transferred and the transfer layer of the thermal transfer sheet are in close contact with each other, and energy is applied to the thermal transfer sheet to transfer the transfer layer to On the body to be transferred, it is performed by peeling the transfer layer transferred on the body to be transferred from the thermal transfer sheet. Moreover, when the releasability of the transfer layer (sometimes referred to as the transferability of the transfer layer) is low, when the transfer layer of the thermal transfer sheet is transferred to the transferred body, the transferred body and the thermal transfer The printed sheet fuses easily. In addition, when the transfer body and the thermal transfer sheet are thermally fused, specifically, until the transfer layer transferred on the transfer body cannot be peeled from the thermal transfer sheet, the transfer body and the thermal transfer sheet When the transfer sheet is attached, for example, when using a thermal transfer sheet with a transfer layer directly set on the substrate to transfer the transfer layer to the transfer object, unexpected heat fusion occurs between the transfer layer and the substrate This situation is likely to occur in the printer, the thermal transfer sheet is broken, or the thermal transfer sheet is transported abnormally (sometimes called JAM) inside the printer. In particular, when there is a transfer transfer layer, as the energy applied to the thermal transfer sheet becomes higher, the releasability of the transfer layer becomes lower, and the heat fusion between the transferred body and the thermal transfer sheet, or due to heat fusion There is a tendency to increase the frequency of abnormal transportation. [0005] In addition, when the releasability of the transfer layer is low, when the transfer layer is peeled off from the thermal transfer sheet, if it is originally between the transfer layer and the constituent members of the thermal transfer sheet directly in contact with the transfer layer The transfer layer that should be peeled off will peel off between the layers constituting the transfer layer, and the transfer layer that should be transferred on the body is likely to be transferred on the substrate, and all or part of the transfer layer will remain on the substrate side. In addition, even if such poor transfer does not occur, when the releasability of the transfer layer is low, the surface of the transfer layer on the transfer interface side is rough during transfer. In other words, the transfer layer on the transfer interface side is rough. The surface smoothness of the layer becomes low, and various problems due to this are likely to occur.　　[0006] In these cases, various studies have been made to improve the releasability of the transfer layer, but there is still room for improvement in the releasability of the transfer layer when high energy is applied to the thermal transfer sheet. [Prior Art Document] [Patent Document] 　　[0007] 　　[Patent Document 1] Japanese Patent Application Publication No. 9-290576 [Patent Document 2] Japanese Patent Application Publication No. 11-263079 [Patent Document 3] Japanese Patent Application Publication No. 2001-246845 Publication [Patent Document 4] Japanese Patent Laid-Open No. 6-122281

[Problems to be Solved by the Invention] 　　[0008] The present invention was completed in view of these circumstances. The main subject is to provide a method for transferring the transfer layer onto the body to be transferred, even if the energy applied to the thermal transfer sheet is high. In the case, a thermal transfer sheet with good releasability of the transfer layer. [Means to Solve the Problem] 　　[0009] The present invention for solving the above-mentioned problems is a thermal transfer sheet, which is characterized in that the transfer layer is located on one surface of the substrate. The thermal transfer sheet is used to transfer the thermal transfer The sheet is overlapped with the body to be transferred, and a thermal transfer sheet supply mechanism, a heating mechanism, and a thermal transfer sheet winding mechanism are used, which are located between the heating mechanism and the thermal transfer sheet winding mechanism and measure the conveyance along the conveying path. The thermal transfer sheet tensile strength measurement mechanism, the printer with the peeling mechanism located between the heating mechanism and the measurement mechanism, with an applied energy of 0.177mJ/dot, and a transfer speed of the thermal transfer sheet 28.2mm/sec . Conditions, while transferring the transfer layer on the transfer body, the transfer layer transferred on the transfer body is peeled from the thermal transfer sheet at a peeling angle of 50° , The tensile strength measured by the aforementioned measuring mechanism is 0.29N/cm or less. [0010] Alternatively, the absolute value of the difference between the tensile strength measured under the aforementioned conditions and the tensile strength measured when the aforementioned applied energy in the aforementioned conditions is changed from 0.177 mJ/dot to 0.169 mJ/dot 0.25N/cm or less. [0011] Alternatively, the transfer layer may have a single layer consisting of the receiving layer or a laminated structure including the receiving layer. When the transfer layer has the layered structure, the receiving layer may be located at a distance The nearest layer of the aforementioned substrate. [Effects of the Invention] 　　[0012] The thermal transfer sheet according to the present invention can be a thermal transfer sheet with good releasability of the transfer layer even when the energy applied to the thermal transfer sheet is high.

條件1：施加能量：0.169(mJ/dot)，搬送速度28.2(mm/sec.) 條件2：施加能量：0.177(mJ/dot)，搬送速度28.2(mm/sec.) (*1)條件1中之拉伸強度與條件2之拉伸強度之差的絕對值[0014] <<Thermal transfer sheet>> Hereinafter, the thermal transfer sheet of one embodiment of the present invention (hereinafter sometimes referred to as the thermal transfer sheet of one embodiment) will be described in detail. 1 to 3 are schematic cross-sectional views showing an example of a thermal transfer sheet according to an embodiment. As shown in FIGS. 1 to 3, a thermal transfer sheet 100 according to an embodiment has a base material 1 and a transfer layer 10 that can be peeled from the base material 1. [0015] As one of the problems that may occur when the transfer layer of the thermal transfer sheet is transferred to the transferred body, for example, the thermal fusion between the transferred body and the thermal transfer sheet. In addition, the heat fusion of the transfer body and the thermal transfer sheet referred to in this specification means that the transfer body and the thermal transfer sheet are overlapped and applied from the side of the thermal transfer sheet by a heating mechanism such as a heater. Energy, transfer the transfer layer of the thermal transfer sheet to the transfer body, only when the transfer layer transferred to the transfer body is peeled from the thermal transfer sheet, it should remain in the thermal transfer A phenomenon in which the constituent members of the thermal transfer sheet on the sheet side are integrated with the transfer layer transferred on the transfer body, and only the transfer layer transferred on the transfer body cannot be peeled from the thermal transfer sheet. For example, when used in a thermal transfer sheet with a transfer layer directly provided on a substrate, the substrate and the transfer layer are integrated to the extent that they cannot be peeled from the substrate and transferred to the transfer layer on the body to be transferred. phenomenon. Or, even if only the transfer layer transferred on the transfer body can be peeled from the thermal transfer sheet, the constituent members of the thermal transfer sheet and the transfer layer transferred to the transfer body are integrated to the transfer When the layer is peeled off, it produces a phenomenon of the degree of abnormal noise. In addition, when the to-be-transferred body and the thermal transfer sheet are thermally fused, it becomes a cause of abnormal conveyance in the printer or poor transfer. In addition, in order to correspond to high-speed printability, when the transfer layer is transferred to the body, when the energy applied to the thermal transfer sheet is high, or when a thermal peel-off printer is used, etc. , There is a tendency for the body to be transferred and the heat transfer sheet to fuse easily. [0016] Various attempts have been made to suppress the thermal fusion of the transferable body and the thermal transfer sheet that may occur when the transfer layer of the thermal transfer sheet is transferred to the transferable body, such as improving the transfer layer Attempts to heat resistance, or to improve the peelability of the transfer layer from the thermal transfer sheet, etc. However, the current status quo is that by taking these countermeasures, even if the thermal fusion between the transferred body and the thermal transfer sheet under specific transfer conditions can be suppressed, if the transfer layer is increased, it is applied to the thermal transfer In the case of the thermal energy of the sheet, the thermal fusion of the transferred body and the thermal transfer sheet cannot be sufficiently suppressed. [0017] In addition, the thermal fusion of the transferred body and the thermal transfer sheet, and the transfer layer 10 transferred on the transferred body are directly connected to the transfer layer from the constituent members constituting the thermal transfer sheet. The peeling force when the contacting constituent member is peeled, for example, when the transfer layer 10 is directly provided on the substrate 1, is closely related to the peeling force when peeling from the substrate 1. It is estimated that by reducing the peeling force, Suppresses the thermal fusion between the transferred body and the thermal transfer sheet. Therefore, when the peeling force of the transfer layer 10 transferred on the transferred body is peeled from the constituent member in contact with the transfer layer, it is difficult to accurately measure in the printer, and it is impossible to detect the transfer body and the heat. The transfer sheet has a problem with the threshold value of the peeling force of thermal fusion. After reviewing this point, it was found that in the printer, the peeling force of the transfer layer 10 transferred on the body to be transferred from the constituent member in contact with the transfer layer is different from the peeling force applied to the thermal transfer during the peeling. The tensile strength of the printed sheet is related, and the tensile strength applied to the thermal transfer sheet during peeling is also closely related to the thermal fusion of the transferred body and the thermal transfer sheet. The following description focuses on the case where the component that is in direct contact with the transfer layer among the components constituting the thermal transfer sheet is used as the base material. However, the thermal transfer sheet of one embodiment is not limited to the direct contact between the base material and the transfer layer. In the case of the form, any layer can be provided between the base material and the transfer layer. In this case, the arbitrary layer becomes a constituent member that is in direct contact with the transfer layer. Hereinafter, unless otherwise specified, the transfer layer 10 transferred on the body to be transferred is peeled off from the constituent members of the thermal transfer sheet 100 that is in contact with the transfer layer, abbreviated as the peeling transfer from the thermal transfer sheet 100 Layer 10. [0018] Therefore, the thermal transfer sheet 100 of one embodiment is characterized by overlapping the thermal transfer sheet 100 with the to-be-transferred body, as shown in FIG. The mechanism 202, the thermal transfer sheet winding mechanism 203, the measuring mechanism 204 which is located between the heating mechanism 202 and the thermal transfer sheet winding mechanism 203 and measures the tensile strength of the thermal transfer sheet conveyed along the conveying path, is located in the heating mechanism The printer 200 of the peeling mechanism 205 between 202 and the measuring mechanism 204 rotates on the transferred body 300 under the conditions of an applied energy of 0.177 mJ/dot and a transfer speed of the thermal transfer sheet of 28.2 mm/sec. When the transfer layer 10 is transferred from the thermal transfer sheet 100 at a peeling angle of 50° while the transfer layer 10 transferred on the body 300 is peeled off, the tensile strength measured by the measuring mechanism 204 is Below 0.29N/cm. [0019] The applied energy (mJ/dot) in this specification is the applied energy calculated by the following formula (1), and the applied power [W] in the formula (1) can be calculated by the following formula (2). Applied energy (mJ/dot)=W×LS×PD×energy grayscale value...(1) ([W] in formula (1) means applied power, [LS] means line period (msec./line) , [PD] means pulse duty ratio) applied power (W/dot)=V ² /R...(2) ([V] in formula (2) means applied voltage, [R] means the heating mechanism resistance). [0020] In addition, the transport speed (mm/sec.) of the thermal transfer sheet referred to in this specification is the transport speed calculated by the following formula (3). Conveying speed (mm/sec.)=(25.4/(printing density in sub-scanning direction (dot/inch)×line period (msec./line)))×1000...(3) (25.4 series in formula (3) The value used to convert inches to mm). [0021] In addition, in this specification, the tensile strength (N/cm) measured by the measuring mechanism is the stress (N) measured by the measuring mechanism divided by the heating width (cm) of the thermal transfer sheet under the above-mentioned conditions value. [0022] Hereinafter, the conditions for peeling off the transfer layer 10 that has been transferred onto the body 300 from the base material 1 are specifically used with a thermal transfer sheet supply mechanism 201, a heating mechanism 202, and a thermal transfer Printed sheet winding mechanism 203, measuring mechanism 204 located between the heating mechanism 202 and the thermal transfer sheet winding mechanism 203 and measuring the tensile strength of the thermal transfer sheet 100 conveyed along the conveying path, located between the heating mechanism 202 and the measuring mechanism The printer 200 with the peeling mechanism between 204 and 205, under the conditions of applying energy 0.177mJ/dot and the conveying speed of the thermal transfer sheet 28.2mm/sec., while continuously transferring the transfer on the transferred body 300 For the layer 10, the conditions under which the transfer layer 10 transferred on the body 300 is peeled from the thermal transfer sheet 100 at a peeling angle of 50° are collectively referred to as "specific measurement conditions." [0023] According to the thermal transfer sheet having one of the above-mentioned features, only by satisfying the condition that the tensile strength of the thermal transfer sheet under the "specific measurement conditions" is 0.29N/cm or less, it will not be subjected to transfer. The effect of various conditions when printing the transfer layer 10 can make the releasability of the transfer layer 10 good. Thereby, it is possible to suppress the thermal fusion between the transferee and the thermal transfer sheet that may occur when the transfer layer 10 of the thermal transfer sheet 100 is transferred to the transferee 300. Specifically, when it is desired to increase the energy applied to the thermal transfer sheet in response to high-speed printability, in other words, even if the application of power is increased, the thermal fusion of the transferred body and the thermal transfer sheet can be suppressed. [0024] More specifically, when it is desired to increase the energy applied to the thermal transfer sheet in response to high-speed printing, although the adhesion between the transferred body and the transfer layer becomes higher, it is easy to be transferred The thermal transfer sheet has a tendency to heat fusion with the thermal transfer sheet. However, the thermal transfer sheet of one of the embodiments based on the tensile strength of the thermal transfer sheet under "specified measurement conditions" of 0.29 N/cm or less can be easily self-contained. The thermal transfer sheet 100 peels off the transfer layer 10, which can suppress the thermal fusion between the transferred body and the thermal transfer sheet. [0025] Furthermore, according to the thermal transfer sheet 100 of one embodiment that can be a good releasability of the transfer layer 10, when the transfer layer 10 is peeled off from the constituent member in contact with the transfer layer 10 of the thermal transfer sheet , The surface roughness of the transfer layer 10 on the side in contact with the constituent member can be suppressed. In other words, it is possible to suppress surface roughness on the surface of the transfer layer 10 located on the transfer interface side. By this, for example, when the layer located at the transfer interface of the layer constituting the transfer layer is used as the receiving layer, the dye dyeability of the receiving layer can be made good, and when the layer located at the transfer interface is used as the protective layer, the transfer The gloss of the printing layer 10 is good. [0026] If the printer 200 used to transfer the transfer layer 10 of the thermal transfer sheet 100 on the transfer body 300 can achieve the above-mentioned "specific measurement conditions", it can also be used to make the transfer layer 10 Melting or softening, before the transfer layer is solidified, the transferred transfer layer 10 is peeled off from the substrate 1 of the thermal transfer sheet 100. A thermal peeling printer can also be used on the transfer layer 10. After curing, a cold-time peel-off printer in which the transferred transfer layer 10 is peeled from the base material 1 of the thermal transfer sheet 100. [0027] In addition, the tensile strength of the thermal transfer sheet of an embodiment is measured when the applied energy is changed from 0.177 mJ/dot to 0.169 mJ/dot in the above-mentioned "specific measurement conditions" and the above-mentioned "specific measurement conditions". The absolute value of the difference in tensile strength is preferably 0.25 N/cm or less, more preferably 0.1 N/cm or less, and still more preferably 0.05 N/cm or less. According to the thermal transfer sheet of this form, the releasability of the transfer layer 10 can be further improved in a wide range of energy. It is particularly preferable that the tensile strength measured by the above-mentioned "specific measurement conditions" is 0.2 N/cm or less, and the absolute value of the difference in the above-mentioned tensile strength is 0.1 N/cm or less. [0028] (Printer) Next, for the above-mentioned "specific measurement conditions", the transfer layer 10 is transferred on the transfer body 300, and the transfer layer 10 transferred on the transfer body is spontaneously transferred. The printer used when the substrate 1 of the printed sheet 100 is peeled off will be described. [0029] As shown in FIG. 7, the printer 200 used for the above-mentioned "specific measurement conditions" includes: a thermal transfer sheet supply roller as a thermal transfer sheet supply mechanism 201 that conveys the thermal transfer sheet 100 along a specific path, and As the winding roller of the thermal transfer sheet winding mechanism 203, the back side of the thermal transfer sheet 100 is heated to transfer the transfer layer 10 to the transferred body 300, and the heating head as the heating mechanism 202 is turned After the printing body 300 can move at the position where the transfer layer 10 is transferred, the pressing roller 206 is located between the heating mechanism 202 and the thermal transfer sheet winding mechanism 203, and after the transfer layer 10 is transferred to the transferred body 300 , The peeling plate as the peeling mechanism 205 that peels off the transfer layer 10 transferred from the substrate 1 and transferred on the to-be-transferred body 300 is located on the conveying path of the thermal transfer sheet 100 and located on the heating mechanism 202 (peeling mechanism 205) With the thermal transfer sheet winding mechanism 203, while continuously transferring the transfer layer 10 on the transfer body 300, the transfer layer 10 transferred from the base material 1 to the transfer body 300 is measured. The tensile strength applied to the thermal transfer sheet at the time is used as a tensiometer of the measuring mechanism 204. [0030] The printer 200 used for the above-mentioned "specific measurement conditions" is provided with the transfer path of the thermal transfer sheet 100 and between the heating mechanism 202 and the thermal transfer sheet winding mechanism 203, as well as the body to be transferred. 300 on the transfer transfer layer 10, while measuring the tensile strength of the thermal transfer sheet when the transfer layer 10 transferred on the transfer body 300 is peeled off from the thermal transfer sheet 100 at a peeling angle of 50° Except for the aspects of the measuring mechanism 204, a conventionally known printer can be appropriately set and used. [0031] As the measuring mechanism 204, any one that can measure the tensile strength of the thermal transfer sheet traveling in the conveying path is sufficient, and a tensiometer (ASK-1000 type, Okura Kogyo Co., Ltd.) can be used. In addition, the tensile strength referred to in this specification is synonymous with tension, and the value of tensile strength indicates that after the transfer layer 10 is transferred to the transferred body 300, it is peeled from the substrate 1 and transferred to the transferred body. The actual value of the peeling force of the transfer layer 10 on 300. According to the printer 200 in which the measuring mechanism 204 is located between the heating mechanism 202 and the thermal transfer sheet winding mechanism 203, by means of the peeling mechanism 205, the transfer layer 10 can be transferred on the transfer body 300 while measuring The peeling angle of 50° is the tensile strength of the thermal transfer sheet at the point when the transfer layer 10 transferred on the transferred body 300 is peeled from the thermal transfer sheet 100. Specifically, by continuously transferring the transfer layer 10 on the transfer body 300, the transfer layer 10 transferred on the transfer body is continuously peeled from the thermal transfer sheet at a peeling angle of 50°. , And the actual peeling force when the transfer layer 10 is peeled off from the constituent member contacting the transfer layer 10 of the thermal transfer sheet 100 can be measured. [0032] Next, an example of the specific configuration of the thermal transfer sheet 100 whose tensile strength under the "specific measurement conditions" is set to 0.29 N/cm or less will be described. In addition, the thermal transfer sheet 100 of one embodiment only needs to satisfy the condition that the tensile strength of the above-mentioned "specific measurement condition" is 0.29 N/cm or less, and other conditions are not limited. Moreover, the specific means for adjusting the tensile strength of the above-mentioned "specific measurement conditions" to 0.29 N/cm or less is not limited, and it can be applied to make the tensile strength of the above-mentioned "specific measurement conditions" 0.29 N/cm or less. Of all means. Hereinafter, a specific method for setting the tensile strength of the above-mentioned "specific measurement conditions" to 0.29 N/cm or less will be described as an example, but it is not limited to this method. [0033] (First means) The first means is a means for appropriately selecting the components contained in the transfer layer 10 and adjusting the tensile strength of the above-mentioned "specific measurement conditions" to 0.29 N/cm or less. Specifically, it is a means to improve the releasability of the layer located at the transfer interface among the layers constituting the transfer layer. [0034] For example, as shown in FIG. 4, when the substrate 1 is provided with a transfer layer 10 formed by sequentially laminating the receiving layer 2 and the adhesive layer 5 from the side of the substrate 1, by selecting The appropriate resin material contained in the receiving layer 2 located at the transfer interface can adjust the tensile strength of the above-mentioned "specific measurement conditions" to 0.29 N/cm or less. As an example, since the receiving layer 2 contains cellulose resin as a resin material, the content of the cellulose resin in the receiving layer can be adjusted appropriately, and the tensile strength of the above-mentioned "specific measurement conditions" can be adjusted to 0.29N/cm or less . As the cellulose resin, cellulose acetate butyrate (CAB), cellulose acetate propionate (CAP), or the like can be preferably used. As an example, since the receiving layer contains cellulose resin with a number average molecular weight (Mn) of less than 70,000, preferably 55,000 or less, particularly preferably 40,000 or less, adjust its content appropriately, and at the same time adjust the thickness of the receiving layer 2 appropriately , The thickness of the base material 1, etc., and the tensile strength of the above-mentioned "specific measurement conditions" can be adjusted to 0.29N/cm or less. In addition, the number average molecular weight (Mn) means the value measured by gel permeation chromatography using polystyrene as a standard material, and means the molecular weight measured by the method according to JIS-K-7252-1 (2008) . [0035] The thickness of the receiving layer when the receiving layer 2 containing the cellulose resin is formed is preferably in the range of 0.3 μm or more and 5 μm or less. [0036] In addition, by combining the resin material and the release agent contained in the transfer layer 10, specifically, by appropriately adjusting the layers constituting the transfer layer 10, the layer located at the transfer interface contains The type of resin material, release agent, and the content thereof can also be adjusted to 0.29 N/cm or less in the above-mentioned "specified measurement conditions". Examples of mold release agents include waxes such as polyethylene wax and silicone wax, silicone resin, silicone modified resin, fluorine resin, fluorine modified resin, polyvinyl alcohol, acrylic resin, and thermosetting resin. Epoxy-amine-based copolymers, and thermosetting alkyd-amine-based copolymers (thermosetting amino-based alkyd resins), etc. [0037] Furthermore, in the first means, considering the thermal shrinkage rate of the substrate, by using a substrate with a thermal shrinkage rate of 10% or less, more preferably 6% or less, and even more preferably 4% or less as the substrate, In the above-mentioned "specific measurement conditions", the tensile strength measured when the applied energy is changed from 0.177 mJ/dot to 0.169 mJ/dot is set to 0.2 N/cm or less. In addition, the absolute value of the difference between the tensile strength measured under the above-mentioned "specific measurement conditions" and the tensile strength measured when the applied energy is changed from 0.177mJ/dot to 0.169mJ/dot in the above-mentioned "specified measurement conditions" can be Set within the above-mentioned preferred range. [0038] The thermal shrinkage rate (%) of the substrate referred to in this specification is the thermal shrinkage rate when measured by a method based on JIS-C-2151 (2006). Specifically, the MD direction length of the substrate (the length of the substrate in the MD direction before the test) is measured, and the substrate is suspended in a hot-air circulating constant temperature bath at 190°C for 20 minutes in a non-loaded state. Subsequently, after cooling the substrate to room temperature, the MD direction length of the cooled substrate (the length of the substrate in the MD direction after the test) was measured. The heat shrinkage rate (%) is when the length of the substrate in the MD direction before the test is set to L ₀ , and the length of the substrate in the MD direction after the test is set to L, by 100×((L ₀ -L)/L ) Calculated value. [0039] Furthermore, the substrate 1 whose thermal shrinkage rate (%) is within the above-mentioned preferred range can also be combined with the following second to fourth means. [0040] (Second Means) The second means is to appropriately adjust the constituent members constituting the thermal transfer sheet, or the thickness of the transfer layer 10, such as the thickness of the substrate 1, the thickness of the transfer layer 10, and the thickness of the transfer layer 10. The thickness of any layer on one side, such as the thickness of the back layer, and the means to adjust the tensile strength of the above-mentioned "specific measurement conditions" to 0.29N/cm or less. Specifically, it is a means to increase the thickness of one or more of the substrate 1, the layer constituting the transfer layer 10, and any of the layers. According to the second method, the energy transfer efficiency of the energy applied from the other side of the substrate 1 to the transfer layer 10 can be suppressed, and thereby the tensile strength of the above-mentioned "specific measurement conditions" can be adjusted to 0.29 N/cm the following. In addition, instead of adjusting the thickness of the substrate 1 or any layer provided on the other side of the substrate 1, a material with low energy transfer efficiency is used as the substrate 1 or any layer provided on the other side of the substrate 1. The material can also suppress the energy transfer efficiency of the energy applied to the other side of the substrate 1 to the transfer layer 10. [0041] (The third means) The third means is to provide an optional layer between the substrate 1 and the transfer layer 10 to improve the transferability of the transfer layer 10, and adjust the tensile strength of the above-mentioned "specific measurement conditions" to Means below 0.29N/cm. As an arbitrary layer, a mold release layer etc. are mentioned, for example. In addition, it is difficult to adjust the tensile strength of the above-mentioned "specific measurement conditions" to 0.29N/cm or less by only the third method. Based on the viewpoint of the adjustment of the tensile strength, the third method is used as the first method, or The second means is an auxiliary means for adjusting the tensile strength, or preferably combined with the fourth means described later. In addition, along with the material of the release layer, the adjustment of the tensile strength can also be achieved by measures such as increasing the thickness of the release layer. In addition, the release layer is a layer that does not constitute the transfer layer 10, but is a layer that remains on the side of the thermal transfer sheet when the transfer layer 10 is transferred. [0042] (Fourth means) The fourth means considers the heat resistance of the transfer layer 10 itself, and adjusts the tensile strength of the above-mentioned "specific measurement conditions" to 0.29 N/cm or less. As a means for improving the heat resistance of the transfer layer, for example, a method containing a hardening resin hardened by a hardening agent, etc. can be exemplified. In addition, it is difficult to adjust the tensile strength of the above-mentioned "specific measurement conditions" to 0.29N/cm or less by the fourth method alone. Based on the viewpoint of the tensile strength adjustment, the fourth method is used as the first method, or The second means is an auxiliary means for adjusting the tensile strength, or preferably combined with the above-mentioned third means. [0043] Also, instead of improving the heat resistance of the transfer layer 10 itself, or at the same time, the heat resistance of any layer provided on the other side of the substrate 1 can be improved. [0044] In addition, by appropriately combining the above-mentioned first to fourth means, the tensile strength of the above-mentioned "specific measurement conditions" may be adjusted to 0.29 N/cm or less. In addition, by combining other methods, the tensile strength of the above-mentioned "specific measurement conditions" may be adjusted to 0.29 N/cm or less. [0045] Hereinafter, the configuration of the thermal transfer sheet 100 of an embodiment will be described as an example. However, the thermal transfer sheet 100 of an embodiment uses the above-described means, etc., to adjust the above-mentioned "specific measurement conditions". It is characterized by adjusting the tensile strength to 0.29 N/cm or less, and other conditions are not limited to the following description. [0046] (Substrate) The substrate 1 is an essential component of the thermal transfer sheet 100 of an embodiment, and is provided to hold the transfer layer 10 provided on one surface of the substrate 1. The material of the base material 1 is not particularly limited, but it is desired to have mechanical properties that can withstand the heat applied when the transfer layer 10 is transferred to the body to be transferred, and are not hindered in handling. Examples of these substrates 1 include polyesters such as polyethylene terephthalate, polyacrylates, polycarbonates, polyurethanes, polyimides, polyetherimides, and cellulose. Derivatives, polyethylene, ethylene-vinyl acetate copolymer, polypropylene, polystyrene, acrylic acid, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl butyral, nylon, polyether ether ketone, poly Waste, polyether, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polyvinyl sulfide, tetrafluoroethylene-ethylene copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, polychlorotrifluoroethylene, polyvinylidene Various plastic films or sheets such as vinyl fluoride. [0047] The thickness of the substrate 1 is not particularly limited, but is preferably in the range of 2.5 μm or more and 10 μm or less. [0048] In addition, in order to adjust the adhesion between the substrate 1 and the transfer layer 10, various surface treatments may be applied to the surface of the substrate 1, such as corona discharge treatment, flame treatment, ozone treatment, ultraviolet treatment, radiation treatment, Roughening treatment, chemical treatment, plasma treatment, low temperature plasma treatment, primer treatment, grafting treatment, etc. [0049] (Transfer layer) As shown in FIGS. 1 to 3, a transfer layer 10 that can be peeled from the substrate 1 is provided on one surface of the substrate 1. The transfer layer 10 is an essential component of the thermal transfer sheet 100 of an embodiment. [0050] The transfer layer 10 referred to in the thermal transfer sheet 100 of one embodiment refers to a layer that is peeled from the substrate 1 during thermal transfer and transferred to a transfer target body. If the transfer layer 10 finally satisfies the condition that the tensile strength of the thermal transfer sheet under the above-mentioned "specific measurement conditions" is 0.29 N/cm or less, the layer composition or the components contained in the transfer layer are not particularly limited. As shown in FIGS. 1 and 2, the transfer layer 10 may have a laminated structure formed by laminating two or more layers, or as shown in FIG. 3, the transfer layer 10 may have a single-layer structure. Hereinafter, an example of the transfer layer 10 constituting the thermal transfer sheet 100 of one embodiment will be described. [0051] (Transfer layer of embodiment A) The transfer layer 10 of embodiment A of the thermal transfer sheet of one embodiment (hereinafter referred to as the transfer layer of embodiment A) is shown in FIG. The substrate 1 side has a laminate structure in which the receiving layer 2 and the adhesive layer 5 are sequentially laminated. Moreover, instead of the form shown in FIG. 1, a protective layer (not shown) may be provided between the receiving layer 2 and the adhesive layer 5. In addition, instead of the form shown in FIG. 1, it is also possible to set the transfer layer 10 composed of only a single layer of the receiving layer 2, and to impart adhesiveness to the receiving layer 2 itself (not shown). The thermal transfer sheet 100 provided with the transfer layer 10 of Embodiment A is a thermal transfer sheet for forming a thermal transfer image-forming sheet. As the adhesive layer 5, a conventionally known adhesive layer in the field of thermal transfer sheets can be appropriately selected and used. In addition, when the tensile strength of the above-mentioned "specific measurement conditions" is adjusted to 0.29 N/cm or less by other than the first means, a conventionally known material can be appropriately selected and used as the receiving layer 2. [0052] The thermal transfer sheet of Embodiment A is used to obtain a thermal transfer sheet with a thermal transfer image-forming sheet on the outermost surface of the receiving layer 2 by transferring the transfer layer 10. In the receiving layer 2 of the thermal transfer imaging sheet obtained by using the thermal transfer sheet of Embodiment A, a thermal transfer image can be formed by transferring the dye of the dye layer. In addition, when the dye of the dye layer is transferred to the receiving layer to form a thermal transfer image, the dyeability of the dye to the receiving layer is related to the smoothness of the surface of the receiving layer 2 facing the dye layer, and the surface of the receiving layer is smooth The higher the performance, the better the dyeability of the dye. As described above, according to the thermal transfer sheet according to one embodiment of the transfer layer 10 having good peelability, when the transfer layer 10 is peeled from the constituent member in contact with the transfer layer 10 of the thermal transfer sheet, it can be suppressed from the structure. The surface of the transfer layer 10 on the side where the member is in contact is roughened. Therefore, in the thermal transfer sheet of Embodiment A, the smoothness of the receiving layer 2 can be improved, and the transfer layer can be transferred to the body to be transferred. Thereby, according to the thermal transfer sheet of the embodiment A, using the thermal transfer sheet of the embodiment A, a thermal transfer imaging sheet with good dyeing properties can be obtained. [0053] (Transfer layer of embodiment B) The transfer layer 10 of embodiment B of the thermal transfer sheet of one embodiment (hereinafter referred to as the transfer layer of embodiment B) is shown in FIG. A layered structure in which the release layer 4 and the receiving layer 2 are sequentially laminated from the side of the substrate 1. The thermal transfer sheet 100 having the transfer layer 10 of the embodiment B is used as a receiving layer of the thermal transfer sheet to form a thermal transfer image, and the transfer layer including the receiving layer on which the thermal transfer image is formed is transferred Printed on the body to be transferred and used as an intermediate transfer medium to obtain the printed matter. In addition, instead of the form shown in FIG. 2, it can also be a layer formed by sequentially laminating a release layer (sometimes called a protective layer) and an adhesive layer on one surface of the substrate 1 from the side of the substrate 1 A thermal transfer sheet composed of a combined structure, or a transfer layer composed of a single layer formed by a release layer is provided on one surface of the base material 1. The thermal transfer sheet of this form transfers the transfer layer on the transfer body, and functions as a protective layer transfer sheet that improves the durability of the transfer body. [0054] In the transfer layer 10 of the embodiment A and the embodiment B, as in the above-mentioned first means, considering the components contained in the layer that constitutes the transfer layer 10 and is located at the transfer interface, the above-mentioned "specific measurement The tensile strength of "Condition" is adjusted to 0.29 N/cm or less, and the tensile strength can be adjusted to 0.29 N/cm or less by the above-mentioned second means, or an appropriate combination of the first to fourth means. [0055] (Transfer layer of embodiment C) The transfer layer 10 of embodiment A of the thermal transfer sheet of one embodiment (hereinafter referred to as the transfer layer of embodiment A) is shown in FIG. 3, which is represented by A single-layer structure composed of the hot-melt ink layer 7. The thermal transfer sheet 100 provided with the transfer layer 10 of the embodiment C functions to form a thermal transfer image on the transferred body every time a layer of hot-melt ink layer 7 is transferred on the transferred body. [0056] In the transfer layer 10 of the embodiment C, in consideration of the resin material contained in the hot-melt ink layer 7 constituting the transfer layer 10, or the component or content of the release agent, etc., the above-mentioned "specific measurement The tensile strength of "condition" is adjusted to 0.29 N/cm or less, and by appropriately selecting the above-mentioned second means to the above-mentioned fourth means, the tensile strength of the transfer layer 10 can also be adjusted to 0.29 N/cm or less. [0057] Moreover, on the same surface of the substrate 1, other layers may be arranged in sequence with the transfer layer 10. For example, as shown in FIG. 4, it may also be a structure in which a layer 8 containing an invisible light absorbing material is arranged on the same surface of the substrate 1 and the transfer layer 10 in order of the surface. Although the transfer layer 10 of the thermal transfer sheet in the form shown in the figure has a laminated structure in which the receiving layer 2 and the adhesive layer 5 are sequentially laminated from the side of the substrate 1, it can also be transferred in other forms. Layer 10. According to the thermal transfer sheet of embodiment A shown in FIG. 4, it can be formed on one surface of the transferred body, which is invisible or difficult to see under visible light, and contains invisible light that can be discerned under infrared light or ultraviolet light. Image 50A of the absorbing material (refer to Figure 5(a)). And, on the image 50A containing invisible light absorbing material (refer to Figure 5(b)) or on the other side of the transferred body (refer to Figure 5(c)), it can be transferred to become a thermal transfer image. Like the transfer layer 10 of the sheet. In addition, the transfer layer 10 of the thermal transfer sheet of the form shown in FIG. 4 is transferred on the transfer body to form a thermal transfer imaging sheet, and then on the receiving layer 2 of the thermal transfer imaging sheet, or An image containing an invisible light absorbing material can also be formed on the surface opposite to the surface on which the receiving layer 2 is transferred (refer to FIG. 6(a), (b)). 5 and 6 are schematic cross-sectional views showing an example of the use form of the thermal transfer sheet of Embodiment A. [0058] (Layer containing invisible light absorbing material) The layer 8 containing invisible light absorbing material contains an invisible light absorbing material. The invisible light absorbing material referred to in this specification means a material that does not absorb visible light or hardly absorbs but is excited by infrared light or ultraviolet light. [0059] As the invisible light absorbing material, for example, an infrared light absorbing material or an ultraviolet light absorbing material can be exemplified. The term "infrared light" in this specification means a wavelength region with a maximum absorption wavelength (λmax) of 750nm to 2000nm, and the so-called "ultraviolet light" means a region with a maximum absorption wavelength (λmax) of 280nm to 400nm. [0060] Examples of infrared light absorbing materials include diiminium-based compounds, aluminum-based compounds, phthalocyanine-based compounds, dithiol-based organometallic complexes, cyanine-based compounds, azo-based compounds, and polymethine compounds. -Based compounds, quinone-based compounds, diphenylmethane-based compounds, triphenylmethane-based compounds, oxazole-based compounds, carbon black, etc. The layer 8 containing the invisible light absorbing material may contain one kind of these infrared light absorbing materials alone, or may contain two or more kinds. [0061] Examples of ultraviolet light absorbing materials include organic ultraviolet light absorbing materials such as benzotriazole-based compounds, triazine-based compounds, benzophenone-based compounds, and benzoate-based compounds, or titanium oxide, oxide Inorganic ultraviolet light absorbing materials such as zinc, cerium oxide, iron oxide, barium sulfate, etc. The layer 8 containing the invisible light absorbing material may contain one kind of these ultraviolet light absorbing materials alone, or may contain two or more kinds. [0062] Moreover, the layer 8 containing invisible light absorbing material may also contain both infrared light absorbing material and ultraviolet light absorbing material. [0063] Furthermore, the layer 8 containing the invisible light absorbing material may also contain a binder resin together with the above invisible light absorbing material. Examples of binder resins include polyester resins, polyethylene resins, fluorine resins, polystyrene resins, polyacrylic resins, cellulose resins, polycarbonate resins, polyamide resins, Conventional resins such as polyolefin resins such as polypropylene resins, polyvinyl alcohol resins, polyimide resins, phenol resins, and polyurethane resins. [0064] In addition, the layer 8 containing the invisible light absorbing material may also contain pigments or organic dyes together with the above invisible light absorbing material. Examples of pigments include colored pigments such as yellow, magenta, and blue, or hollow particles, silicon oxide, titanium oxide, titanium dioxide, zinc oxide, cerium oxide, titanium mica, muscovite, white carbon, calcium carbonate, and sulfuric acid. Barium, alumina white, talc, etc. In addition, it can also be used for cores made of inorganic pigments and covered with shells made of organic pigments. Shell paint, etc. Examples of organic dyes include yellow dyes, magenta dyes, blue dyes, and the like. [0065] The thickness of the layer 8 containing the invisible light absorbing material is preferably in the range of 0.3 μm or more and 5 μm or less. [0066] In addition, in the layer 8 containing the invisible light absorbing material, instead of containing pigments or organic dyes, the layer 8 containing the invisible light absorbing material can also be a laminate of a layer containing an invisible light absorbing material and a layer containing a pigment. Composition (not shown). [0067] When the layer 8 containing the invisible light absorbing material is configured as a laminate, the layer containing the invisible light absorbing material may be located closest to the substrate 1, or may be located at the farthest from the substrate 1. The layer containing the invisible light absorbing material 8 can also be a layer containing an invisible light absorbing material, a layer containing a pigment, and one or more layers of any layer. The layer containing an invisible light absorbing material can be located between any layers. The same applies to layers containing pigments. [0068] As the pigment-containing layer, at least one of the above-exemplified organic pigments and inorganic pigments, and additives such as binders as needed are contained. Examples of the binder are, for example, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, polyethylene, polystyrene, polypropylene, polybutene, petroleum resin, vinyl chloride resin, vinyl chloride-vinyl acetate copolymer , Polyvinyl alcohol, vinylidene chloride resin, acrylic resin, methacrylic resin, polyamide, polycarbonate, fluororesin, polyvinyl methyl acetal, polyvinyl butyral, acetyl cellulose, nitrocellulose Vegetarian, polyvinyl acetate, polyisobutylene, ethyl cellulose or polyacetal, etc. In addition, as the binder, there are microcrystalline wax, carnauba wax, paraffin wax, and the like. Furthermore, Fischer-Tropsch wax, various low molecular weight polyethylene, wood wax, beeswax, spermaceti, insect wax, wool wax, shellac wax, candelilla wax, petrolatum, polyester wax can also be used , Some waxes such as modified waxes, fatty acid esters, and fatty acid amides. [0069] The thickness of the layer containing the pigment is not particularly limited, but is preferably in the range of 0.1 μm or more and 5 μm or less, more preferably in the range of 0.5 μm or more and 1.5 μm or less. [0070] (Arbitrary layer) In addition, the thermal transfer sheet 100 of one embodiment may include any layer that does not constitute a transfer layer. As an arbitrary layer, for example, a release layer (not shown) provided between the substrate 1 and the transfer layer 10 to improve the transferability of the transfer layer 10, or provided on the other surface of the substrate 1 It is used to improve the heat resistance or the back layer of the heating element such as heating element. These arbitrary layers can be provided as plural means when the tensile strength is adjusted by the above-mentioned first means or second means. [0071] (Transferred body) The transferred body to be transferred by the transfer layer 10 of the thermal transfer sheet 100 of one embodiment is not particularly limited, and plain paper, fine paper, tracing paper, and plastic can be used. Film, plastic card composed of vinyl chloride, vinyl chloride-vinyl acetate copolymer, polycarbonate as the main body, thermal transfer imaging sheet, transfer layer of intermediate transfer medium on any object The printed matter, etc. [Examples] [0072] Next, examples and comparative examples are given to illustrate the present invention in more detail. Hereinafter, as long as it is not particularly limited, parts or% are the basis of mass. [0073] (Example 1) A polyethylene terephthalate film with a thickness of 5 μm was prepared as a substrate, and a receiving layer of the following composition was coated on one surface of the substrate so that the thickness becomes 1 μm when dried The coating liquid 1 was used and dried to form a receiving layer. Next, on this receiving layer, the coating liquid for an adhesive layer of the following composition was apply|coated so that the thickness in drying might become 1 micrometer, and it dried and formed the adhesive layer. Furthermore, on the other side of the substrate, the coating liquid 1 for the back layer of the following composition was applied so that the thickness during drying became 1 μm and dried to form the back layer, and the substrate was formed on one side of the substrate. The transfer layer formed by sequentially laminating the receiving layer and the adhesive layer on the substrate side, and the thermal transfer sheet of Example 1 where the back layer is provided on the other side of the substrate. In addition, a polyethylene terephthalate film with a thickness of 5 μm has a heat shrinkage rate of 2.95% when measured in accordance with the method of JIS-C-2151 (2006). [0074] <Coating Liquid 1 for Receptive Layer>. 16.7 parts of vinyl chloride-vinyl acetate copolymer (SOLBIN (registered trademark) CNL Nissin Chemical Industry Co., Ltd.). 1 part of cellulose acetate butyrate (CAB-381-0.5 EASTMAN CHEMICAL (shares))． 1.8 parts of organic modified polysiloxane (X-22-3000T Shin-Etsu Chemical Industry Co., Ltd.). Organic modified polysiloxane 0.5 parts (KF-352A Shin-Etsu Chemical Industry Co., Ltd.). 40 parts of methyl ethyl ketone. 40 parts of toluene [0075] <Coating liquid for adhesive layer>. 8 parts of acrylic resin (DIANAL (registered trademark) BR-87, Mitsubishi 缧萦 (stock)). 2 copies of vinyl chloride-vinyl acetate copolymer (SOLBIN (registered trademark) CNL Nissin Chemical Industry Co., Ltd.). 30 parts of methyl ethyl ketone. 30 parts of toluene [0076] <Coating liquid for back layer 1>. 1.8 parts of polyvinyl butyral resin (SLEC (registered trademark) BX-1 Sekisui Chemical Industry Co., Ltd.)). 5.5 parts of polyisocyanate hardener (BURNOCK (registered trademark) D750 DIC (shares)). 1.6 parts of phosphate (PRISURF (registered trademark) A208N Daiichi Industrial Pharmaceutical Co., Ltd.)). 0.35 copies of talc (MICRO ACE (registered trademark) P-3 Japanese talc (shares)). 0.3 parts of polyethylene wax. 18.5 parts of methyl ethyl ketone. 18.5 parts of toluene [0077] (Example 2) Except that a polyethylene terephthalate film with a thickness of 5 μm was changed to a polyethylene terephthalate film with a thickness of 4.5 μm, everything was obtained in the same manner as in Example 1. The thermal transfer sheet of Example 2. In addition, a polyethylene terephthalate film with a thickness of 4.5 μm has a heat shrinkage rate of 5.5% when measured in accordance with the method of JIS-C-2151 (2006). (Example 3) Except that a polyethylene terephthalate film with a thickness of 5 μm was changed to a polyethylene terephthalate film with a thickness of 4.5 μm, the coating solution 1 for the receiving layer was changed to the following composition The heat transfer sheet of Example 3 was obtained in the same manner as in Example 1, except that the coating solution 2 for receiving layer was used to form the receiving layer. In addition, a polyethylene terephthalate film with a thickness of 4.5 μm has a heat shrinkage rate of 5.5% when measured in accordance with the method of JIS-C-2151 (2006). [0079] <Coating Liquid 2 for Receptive Layer>. 15.7 parts of vinyl chloride-vinyl acetate copolymer (SOLBIN (registered trademark) CNL Nissin Chemical Industry Co., Ltd.). 2 parts of cellulose acetate butyrate (CAB-381-0.5 EASTMAN CHEMICAL (shares))． 1.8 parts of organic modified polysiloxane (X-22-3000T Shin-Etsu Chemical Industry Co., Ltd.). Organic modified polysiloxane 0.5 parts (KF-352A Shin-Etsu Chemical Industry Co., Ltd.). 40 parts of methyl ethyl ketone. 40 parts of toluene [0080] (Example 4) Except that the polyethylene terephthalate film with a thickness of 5 μm was changed to a polyethylene terephthalate film with a thickness of 4.3 μm, everything was obtained in the same manner as in Example 1. The thermal transfer sheet of Example 4. In addition, the thickness of the polyethylene terephthalate film with a thickness of 4.3 μm has a heat shrinkage rate of 3.15% when measured in accordance with the method of JIS-C-2151 (2006). (Example 5) Except that a polyethylene terephthalate film with a thickness of 5 μm was changed to a polyethylene terephthalate film with a thickness of 5.7 μm, the coating solution 1 for the receiving layer was changed to the composition described above The heat transfer sheet of Example 5 was obtained in the same manner as in Example 1, except that the coating liquid 2 for a receiving layer was to form the receiving layer. In addition, a polyethylene terephthalate film with a thickness of 5.7 μm has a heat shrinkage rate of 2.8% when measured in accordance with the method of JIS-C-2151 (2006). [0082] (Comparative Example 1) Except that a polyethylene terephthalate film having a thickness of 5 μm was changed to a polyethylene terephthalate film having a thickness of 4.5 μm, the coating solution 1 for the receiving layer was changed to the following composition The heat transfer sheet of Comparative Example 1 was obtained in the same manner as in Example 1, except that the coating liquid A for receiving layer was used to form the receiving layer. In addition, a polyethylene terephthalate film with a thickness of 4.5 μm has a heat shrinkage rate of 5.5% when measured in accordance with the method of JIS-C-2151 (2006). [0083] <Coating Liquid A for Receptive Layer>. 19 copies of vinyl chloride-vinyl acetate copolymer (SOLBIN (registered trademark) CNL Nissin Chemical Industry Co., Ltd.). 1 copy of vinyl chloride-vinyl acetate copolymer (SOLBIN (registered trademark) C Nissin Chemical Industry Co., Ltd.). 40 parts of methyl ethyl ketone. 40 parts of toluene [0084] (Comparative Example 2) Except that the polyethylene terephthalate film with a thickness of 5μm was changed to a polyethylene terephthalate film with a thickness of 4.5μm, the coating solution 1 for the receiving layer was changed to The coating liquid A for the receiving layer of the above composition forms the receiving layer, and the coating liquid 1 for the back layer is changed to the coating liquid A for the back layer of the following composition to form the back layer. All are the same as Example 1 to obtain Comparative Example 2 The thermal transfer sheet. In addition, a polyethylene terephthalate film with a thickness of 4.5 μm has a heat shrinkage rate of 5.5% when measured in accordance with the method of JIS-C-2151 (2006). [0085] <Coating Liquid A for Back Layer>. 6 parts of polyvinyl butyral resin (#3000-4 DENKA (shares)). 8 parts of polyisocyanate hardener (BURNOCK (registered trademark) D750-45 DIC (shares)). 3 parts of zinc stearate phosphate (LBT-1830 purification Sakai Chemical Industry Co., Ltd.). 3 parts of zinc stearate (SZ-PF Sakai Chemical Industry Co., Ltd.). 1.5 copies of talc (MICRO ACE (registered trademark) P-3 Japanese talc (shares)). 3 parts of polyethylene wax (POLYWAX 3000 Toyo ADL (shares))． 62.92 parts of methyl ethyl ketone. 12.58 parts of toluene [0086] (Creation of the transfer material) Use a 35μm thick porous polyolefin film (SP-U Mitsui Chemicals TOHCELLO (stock)) to coat it so that the dry thickness becomes 1.5μm The coating solution for the undercoat layer of the above composition is dried to form the undercoat layer. Secondly, the undercoat layer is coated with the following composition by using a bar coater so that the thickness when dried becomes 4μm. The layer coating liquid (i) is dried to form a receiving layer, and a laminate obtained by sequentially laminating a primer layer and a receiving layer on a porous polyolefin film. Next, the laminated body obtained above was pasted on one side of a core paper (OKL card, Oji Paper (stock)) with a thickness of 400 μm (weight per unit area of 310 g/m ^{2 ).} In addition, the other side of the core paper is similarly bonded to the porous polyolefin film, which is a laminate obtained by sequentially laminating a primer layer and a receiving layer. In addition, the bonding of the core paper and the laminate was performed with the adhesive layer coating liquid (i) (thickness 4 μm) having the following composition. Thereby, a transferred body in which a porous polyolefin film, an undercoat layer, and a receiving layer are sequentially provided on both sides of the core material paper from the core material paper side is obtained. [0087] (Coating Liquid for Undercoat Layer). 4.2 parts of polyester resin (POLYESTAR (registered trademark) WR-905 Nippon Synthetic Chemical Industry Co., Ltd.)． 8.4 parts of titanium oxide (TCA-888 Sakai Chemical Industry Co., Ltd.). Fluorescent brightener 0.07 parts (UVITEX (registered trademark) BAC, BASF JAPAN company)． 7.2 parts of isopropanol. 21 parts of water [0088] (coating liquid for receiving layer (i)). 10 copies of vinyl chloride-vinyl acetate copolymer (SOLBIN (registered trademark) C Nissin Chemical Industry Co., Ltd.). 1 part of silicone oil (X-22-3000T Shin-Etsu Chemical Industry Co., Ltd.)． 20 parts of toluene. 20 parts of ethyl acetate [0089] (coating liquid for adhesive layer (i)). 30 parts of polyol resin (TAKELAC (registered trademark) A-969V Mitsui Chemicals Co., Ltd.)． 10 parts of isocyanate (TAKENATE (registered trademark) A-5 Mitsui Chemicals Co., Ltd.). 60 parts of ethyl acetate [0090] (Calculation of tensile strength when heated (calculation of peeling force when heated)) Combine the heat transfer sheet of each of the above-mentioned Examples and Comparative Examples with the above-mentioned to-be-transferred body, Using the following thermal release type test printer 1, the transfer layer of the thermal transfer sheet was transferred on the body to be transferred, and the transferred transfer layer was peeled from the substrate to obtain the transfer layer. The printed matter of each embodiment and comparative example with a transfer layer on the body. When the printed matter is obtained, the stress of the thermal transfer sheet at the point when the transfer layer transferred on the transferred body is peeled from the substrate at a peeling angle of 50°, due to the thermal transfer in the printer A tensiometer (ASK-1000, Okura Industry Co., Ltd.) is installed between the winding roller of the sheet and the heating mechanism (heating head) to measure it. Secondly, the stress measured by the tensiometer is divided by the heating width of the thermal transfer sheet (the energy application width) to calculate the value of the tensile strength. Also, for the above-mentioned test printer 1, the applied energy is changed from 0.177mJ/dot to 0.169mJ/dot when the conditions of the test printer 1 are changed (the applied voltage is changed from 18.7V to 18.3V). The value of intensity is also calculated in the same way. Table 1 shows the calculation results of tensile strength. In addition, in the conditions of the test printer 1, a thermal transfer sheet with a tensile strength of 0.29 N/cm or less was set as the thermal transfer sheet of the example, and a thermal transfer sheet with a tensile strength greater than 0.29 N/cm was set as the comparative example. Thermal transfer sheet. [0091] (Test printer 1 (peel type when hot)). Average resistance value of heating element: 5045 (Ω)． Printing density in the main scanning direction: 300 (dpi)． Printing density in sub-scanning direction: 300 (dpi)． Applied voltage: 18.7 (V)． Line period: 3(msec.)． Pulse duty cycle: 85 (%). Printing start temperature: 29.0~36.0(℃)． The distance from the heating point to the peeling plate: 4.5 (mm)． Printing pressure: 3.5~4.0(kgf)(34.3~39.2(N))． Evaluation image (energy grayscale): 255/255 grayscale image. The applied energy calculated from the above formula (1): 0.177 (mJ/dot). The conveying speed calculated by the above formula (3): 28.2 (mm/sec.) [0092] (Evaluation of thermal fusion) In the combination of the thermal transfer sheet of each embodiment and the comparative example and the above-mentioned to-be-transferred body, Based on the following evaluation criteria, using the test printer 1 of the above-mentioned thermal peeling type, the thermal fusion evaluation when the transfer layer was transferred to the transferred body was performed under the condition of applying an energy of 0.177 (mJ/dot). The evaluation results are shown in Table 1 together. [0093] "Evaluation Criteria" A: No heat fusion or peeling sound occurred, and the transfer layer could be peeled off the base material well. B: No heat fusion occurred, and the transfer layer could be peeled from the base material well, but peeling sound occurred. NG: Part or all of the transfer layer is thermally fused, and part or all of the transfer layer cannot be peeled from the substrate. [0094] (Preparation of a thermal transfer sheet with a dye layer) A polyethylene terephthalate film with a thickness of 5 μm is used as a substrate, and the back layer of the above composition is coated so that the thickness when dried becomes 1 μm The coating liquid 1 was dried and the back layer was formed. Next, on the other side of the substrate, a coating solution for a dye undercoating layer having the following composition is applied so that the thickness during drying becomes 0.15 μm and dried to form a dye undercoating layer. On the dye primer layer, the yellow, magenta, and blue dye layer coating liquids of the following composition are applied in the order of the surface so that the thickness when dried becomes 0.7 μm and dried to form a yellow dye layer and a product. Red dye layer and blue dye layer, to obtain a thermal transfer sheet with dye layer. [0095] <Coating Liquid for Dye Undercoat>. Colloidal alumina (solid content 10.5%) 3.5 parts (alumina sol 200 Nissan Chemical Industry Co., Ltd.). 1.5 parts of vinyl acetate-vinylpyrrolidone copolymer (PVP/VA E-335, ISP JAPAN)． 47.5 parts of water. 47.5 parts of isopropyl alcohol [0096] <Coating liquid for yellow dye layer>. Solvent Yellow 93 2.5 parts. Disperse Yellow 201 2.5 parts. 4 parts of polyvinyl acetal resin (SLEC (registered trademark) KS-5 Sekisui Chemical Industry Co., Ltd.). 0.04 parts of organic modified silicone oil. 50 parts of toluene. 50 parts of methyl ethyl ketone [0097] <Coating liquid for magenta dye layer>. Disperse Red 60 3 parts. Disperse Violet 26 3 parts. 5 parts of polyvinyl acetal resin (SLEC (registered trademark) KS-5 Sekisui Chemical Industry Co., Ltd.). 0.05 parts of organic modified silicone oil. 50 parts of toluene. 50 parts of methyl ethyl ketone [0098] <Coating liquid for blue dye layer>. Solvent Blue 63 3 parts. Disperse Blue 354 4 parts. 5 parts of polyvinyl acetal resin (SLEC (registered trademark) KS-5 Sekisui Chemical Industry Co., Ltd.). 0.05 parts of organic modified silicone oil. 50 parts of toluene. 50 parts of methyl ethyl ketone [0099] (Evaluation of dyeing properties) On the transfer layer of the printed matter of each of the examples and comparative examples obtained by the above-mentioned thermal fusion evaluation (the heat of the respective examples and comparative examples) On the receiving layer of the transfer layer of the transfer sheet), use the yellow dye layer, magenta dye layer, and blue dye layer of the thermal transfer sheet with the dye layer made above to form a black image (0/255 gray scale ). The formed black image was visually confirmed, and the dye dyeability was evaluated based on the following evaluation criteria. The evaluation results are shown in Table 1 together. In addition, the absence of unevenness in the image means that the releasability when the transfer layer is peeled off is good, and the surface smoothness of the receiving layer is high (the receiving layer is normally transferred). [0100] "Evaluation Criteria" A: No unevenness of shading occurs in the black image. B: Darkness unevenness occurs in a black image. [0101]

Condition 1: Applied energy: 0.169 (mJ/dot), conveying speed 28.2 (mm/sec.) Condition 2: Applied energy: 0.177 (mJ/dot), conveying speed 28.2 (mm/sec.) (*1) Condition 1 The absolute value of the difference between the tensile strength of the condition and the tensile strength of condition 2

1: Substrate

2: Receiving layer

4: peeling layer

5: Next layer

7: Hot melt ink layer

8: Layer containing invisible light absorbing material

10: Transfer layer

100: Thermal transfer sheet

200: Printer

201: Thermal transfer sheet supply mechanism

202: heating mechanism

203: Thermal transfer sheet winding mechanism

204: Measuring Institution

205: Stripping Mechanism

300: Transferred body

50A: Images containing invisible light absorbing materials

206: pressure roller

[0013] 　　 FIG. 1 is a schematic cross-sectional view showing an example of a thermal transfer sheet according to an embodiment.　　 Figure 2 is a schematic cross-sectional view showing an example of a thermal transfer sheet according to an embodiment.　　 FIG. 3 is a schematic cross-sectional view showing an example of a thermal transfer sheet according to an embodiment.　　 FIG. 4 is a schematic cross-sectional view showing an example of the thermal transfer sheet of Embodiment A.　　 FIG. 5 is a schematic cross-sectional view showing an example of the use form of the thermal transfer sheet of Embodiment A.　　 FIG. 6 is a schematic cross-sectional view showing an example of the use form of the thermal transfer sheet of Embodiment A.　　 FIG. 7 is a schematic diagram showing an example of a printer used to transfer the transfer layer of the thermal transfer sheet of an embodiment.

10‧‧‧Transfer layer

100‧‧‧Heat Transfer Sheet

200‧‧‧Printer

201‧‧‧Thermal transfer sheet supply mechanism

202‧‧‧Heating mechanism

203‧‧‧Heat transfer sheet winding mechanism

204‧‧‧Measuring organization

205‧‧‧Stripping mechanism

206‧‧‧Press roller

300‧‧‧Subject to be transferred

Claims (2)

A thermal transfer sheet, characterized in that the transfer layer is located on one surface of the substrate, and the transfer layer is composed of a single layer composed of only the receiving layer or a laminated structure including the receiving layer at the transfer interface. The receiving layer contains either or both of cellulose acetate butyrate and cellulose acetate propionate, and a vinyl chloride-vinyl acetate copolymer. The thermal transfer sheet of claim 1, wherein the receiving layer further contains silicone oil.

Images