KR100362765B1 - Decorative thermal transfer sheet and manufacturing method thereof - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to reduce the variation of irregularities on the surface of an ink layer so as to suppress the color unevenness transferred on the transparent adherend and to improve the appearance, so that the ink layer, the release layer containing the thermoplastic resin, and the basis weight are The thermal transfer sheet which laminated | stacked the support layer which is 20-180 g / m <2> paper in this order WHEREIN: It is related with the thermal transfer sheet which the fluctuation | variation of the unevenness | corrugation measured on the both surfaces of an ink layer is ± 1 micrometer or less, and its manufacturing method.

Description

Decorative thermal transfer sheet and manufacturing method thereof

The present invention relates to a decorative thermal transfer sheet.

Japanese Unexamined Patent Application Publication No. 1-34277 describes a thermal transfer sheet in which an ink layer is disposed on a support layer having a release layer. The composition of the ink layer of this thermal transfer sheet is a composition containing a thermoplastic resin, a plasticizer, and a coloring agent selected from polyvinyl chloride resin and its copolymer. The thermal transfer temperature of this ink layer is lower than that of the prior art and is 75 to 110 ° C. The material of the support layer is a paper having peelability or a plastic film such as polyethylene or polypropylene. This thermal transfer sheet is prepared by preparing a coating liquid obtained by dissolving or uniformly dispersing an ink layer composition in a solvent, applying the coating liquid to a surface having peelability of a support layer, and drying to form an ink layer.

The advantage of this transfer sheet is that (i) the ink layer softens by heat and the ink layer is reliably adhered and transferred according to the unevenness of the surface of the adherend, and (ii) thermoelectric at a lower temperature (110 ° C. or lower) than conventionally. It is possible to suppress the heat deformation of the plastic sheet of the adherend because it is possible. On the other hand, the problem with this transfer sheet is that (1) when the support layer is paper, the irregularities of the surface of the paper are reflected and the unevenness of the surface of the ink layer after transfer is increased, so that the ink layer transferred on the transparent or translucent adherend is dark. (2) When the support layer is excessively softened, the positioning at the time of transferring the ink layer to the adherend becomes difficult, and wrinkles are liable to occur during transfer. In addition, it is difficult to avoid the wrinkles, and (3) when the support layer is too hard, in the portions where the thermal transfer sheets overlap each other on the transparent or translucent adherend, the portions which are not transferred at the ends of the ink layer are Since the transmitted light from the light source which is generated and spaced toward the adherend leaks out from the portion, the appearance is poor. This relationship is shown in FIG. In Fig. 3, reference numeral 11 denotes an ink layer, 14 a support layer, and 10 a transparent plastic sheet of an adherend.

Japanese Patent Application Laid-Open No. 2-32158 discloses a thermal transfer sheet in which an ink layer is disposed on a support layer made of paper, and the ink layer surface of the thermal transfer sheet is brought into contact with a surface of an adherend having a thermoplastic adhesive layer to thermally transfer the ink layer. The method is described. As a paper used here, the film-forming synthetic paper by the internal papermaking method is optimal. This is because the printing of the ink (image) layer is easy and the peelability of the ink layer during thermal transfer is good. Paper thickness is 110-150 micrometers (example). This thermal transfer sheet is produced by disposing an ink layer on a support layer which is paper by a printing method.

The advantage of this thermal transfer sheet is that the support layer does not have an adhesive layer, and since the adherend has a thermoplastic adhesive layer containing the ink layer, it is easy to peel off the support layer after the transfer of the ink layer. However, this thermal transfer sheet could not solve the above-mentioned problem (1) of Unexamined-Japanese-Patent No. 1-34277.

An object of the present invention is to (1) reduce fluctuations in irregularities of the surface of an ink layer, thereby suppressing non-uniformity of the shade of the ink layer transferred onto a transparent or translucent adherend, thereby improving appearance, and (2) an ink layer on the adherend. It is possible to facilitate positioning when transferring the film, to prevent the occurrence of wrinkles when transferring at the same time, and to avoid the wrinkles easily even if they occur. (3) On the transparent or translucent adherend, the thermal transfer sheet There is no transfer portion at the ink layer end of the overlapped portion, so that the thermal transfer sheet can be provided at the same time to allow the transparent adherend to pass through the transparent adherend after the ink layer transfer so that light does not leak.

The present invention relates to a reverse transfer sheet obtained by laminating an ink layer, a release layer containing a thermoplastic resin, and a support layer in this order, the support layer being a paper having a basis weight in the range of 20 to 180 g / m 2, and the amount of the ink layer. A thermal transfer sheet having a thickness variation measured at the surface of ± 1 μm or less is provided.

Unevenness | corrugation variation in the outer surface of the thermal transfer paper of the said ink layer is ± 1 micrometer or less. Preferably it is less than +/- 1 micrometer. On the other hand, the unevenness variation of the surface after the ink is transferred to a flat plane is ± 1 μm or less. Preferably it is less than +/- 1 micrometer. The reason is that if the unevenness variation is larger than ± 1 µm, the non-uniformity of the shade of the ink layer transferred to the adherend is visually confirmed and the appearance is deteriorated.

In the method of measuring the fluctuations of irregularities of the surface of the ink layer, 10 points are selected at 5 mm intervals on a straight line on the surface of the ink layer, and the average value of the 10 points is calculated by measuring using a micro gauge of 1/1000 mm scale. . Subsequently, 10 points are selected at 5 mm intervals on another straight line perpendicular to the straight line and measured in the same manner to calculate an average value of the 10 points. The average of these two average values is called fluctuation of irregularities of the ink layer.

The thickness of the ink layer is preferably 5 to 50 mu m, particularly preferably 8 to 14 mu m. The reason is that when the thickness is less than 5 µm, the appearance seen from the surface of the ink layer becomes worse. On the contrary, when the thickness is larger than 50 µm, the permeability is poor and the appearance that can be seen from the back surface becomes worse.

The thermoplastic ink layer preferably contains 20 to 95 wt% of thermoplastic resin, 2 to 48 wt% of plasticizer, and 1 to 40 wt% of colorant. Especially preferably, the thermoplastic resin contains 25 to 85 wt%, plasticizer 5 to 10 wt%, and colorant 10 to 40 wt%. In addition, the thermoplastic ink layer preferably contains an ultraviolet absorber, an antioxidant, and a heat stabilizer.

Examples of the thermoplastic resin in the ink layer include methacrylates such as polyvinyl chloride, vinyl chloride copolymer, methyl methacrylate, ethyl methacrylate and butyl methacrylate, and methyl acrylate, ethyl acrylate and butyl acrylate. Polyurethane resins, such as a copolymer with an acrylate and an aromatic polyester polyurethane, a polyester resin, ethylene vinyl acetate resin, and an acrylonitrile butadiene styrene resin are used. Among them, polyvinyl chloride or polyvinyl chloride copolymers are preferable, and polyvinyl chloride resin-vinyl acetate copolymer is particularly preferable. This is because the adhesion to the adherend using transparent or semitransparent plastic is good, and the ink layer is not transferred, thereby preventing the occurrence of the portion where the transmitted light leaks.

As the plasticizer present in the ink layer, an aliphatic alcohol phthalate, an aromatic alcohol phthalate, a high molecular polyester, an epoxidized vegetable oil such as epoxidized amine oil, or a phosphate ester is preferably used. As a coloring agent, dye or pigment is preferable, Especially preferably, it is a pigment. As pigments, preferably molybdate orange, primrose yellow, quinacridone red, phthalocyanine blue, carbon black, phthalocyanine green, rutile titanium dioxide, carbazole violet, chrome yellow, irgasin yellow, red chromate yellow or quinacrylic Use money pink.

The softening point of the ink layer is preferably 20 to 150 ° C, more preferably 40 to 100 ° C, particularly preferably 40 to 80 ° C. The reason is that when the temperature is less than 20 ° C., the ink layer existing on the transparent or translucent adherend does not peel off from the release layer, and thus the portion where the transmitted light which is not transferred leaks easily occurs. On the contrary, when it is higher than 150 ° C., the adhesion to the adherend is poor. This is because it is easy to occur.

The ink liquid can be obtained as a uniform ink liquid by collecting a predetermined amount of raw materials in a container such as a drum tube and stirring for about 15 minutes. The solvent of the ink solution is preferably methyl isobutyl ketone, cyclohexanone, isophorone, toluene and xylene alone or in combination. Especially preferably, it is methyl isobutyl ketone. According to these solvents, the solubility of the ink containing a thermoplastic resin, the viscosity, the dryness, and the leveling characteristic of the ink liquid can be made favorable. It is important to improve the leveling characteristics because the fluctuations in irregularities on the surface of the ink layer are reduced.

The release layer containing the thermoplastic resin is peeled off without destroying the ink layer during thermal transfer, and the peeling layer softens by heating, so that the ink layer transfers and reliably adheres according to the irregularities on the adherend. . This thermoplastic resin is preferably a resin containing an ethylene-vinyl acetate resin, particularly preferably an ethylene-vinyl acetate resin. This is because the ink layer can be easily peeled off during thermal transfer, and the peeling layer can be softened appropriately by heating to reliably adhere the ink layer in accordance with the irregularities on the adherend. The composition of this ethylene-vinyl acetate resin preferably contains 10 to 40 wt%, particularly preferably 20 to 30 wt% of units derived by vinyl polymerization of vinyl acetate. The reason for this is that when the amount is less than 10 wt%, it is difficult to reliably adhere and transfer the ink layer according to the irregularities on the adherend, and when it is more than 40%, the ink layer is not easily peeled off during thermal transfer.

The softening point of the release layer is preferably 10 to 100 ° C, particularly preferably 40 to 90 ° C. The reason is that when it is less than 10 ° C, it is not easy to peel off at the interface between the peeling layer and the ink layer when thermally transferred to the adherend. If it is higher than 100 ° C, the ink layer is reliably adhered to the unevenness of the adherend. This is because the transfer is not easy. The softening point of the ethylene-vinyl acetate resin is preferably 70 to 90 ° C, particularly preferably 70 to 80 ° C as measured by ASTM D1525-70 (VICAT method).

As the thermoplastic resin that can be used, preferably one or two or more selected from ionomer resin, vinyl chloride-vinyl acetate copolymer, acrylic resin, styrene resin, urethane resin, polyester resin and ethylene-vinyl acetate It is a mixture or resin with resin. This is because the thermoplastic resin softens properly during thermal transfer, and the ink layer can be reliably adhered and transferred in accordance with the irregularities of the adherend. It is especially preferable to laminate | stack two layers the layer containing ethylene-vinyl acetate resin (support body side), and the layer containing ionomer resin (ink layer side). The reason for this is that the ionomer resin maintains the peel strength with the ink layer optimally and facilitates the peeling without destroying the ink layer, and the ethylene-vinyl acetate resin softens moderately at the time of transfer, depending on the unevenness of the adherend. This is because the ink layer is reliably adhered to facilitate transfer. Herein, the ionomer resin is a resin obtained by partially or completely neutralizing a copolymer of ethylene with α and β unsaturated carboxylic acids with metal ions, and having a crosslinked structure by ionic bonding between molecules.

The peeling strength between the peeling layer and the ink layer is preferably 300 to 1000 g / m, more preferably 600 to 800 g / m. The reason is that when the thermal transfer sheet of the present invention is less than 300 g / m, the ink layer easily peels from the release layer, and when larger than 1000 g / m, the ink layer is easily broken without breaking the ink layer during thermal transfer. Because you can not transfer.

The thickness of the release layer is preferably in the range of 10 to 300 µm, more preferably 50 to 200 µm. This is because when the thickness is less than 10 µm, the ink layer is hardly adhered and transferred according to the irregularities of the adherend, and when the thickness is greater than 300 µm, the entire thermal transfer sheet becomes too thick.

The support layer should not generate a portion of the end portion which cannot transfer the ink layer to the correct position of the adherend, but should have a function of thermal transfer without generating wrinkles. In the present invention, paper is used. The type of paper is preferably a processed paper containing paper or paper made of pulp as a raw material, and particularly preferably a processed paper obtained by impregnating resin in paper or pulp made of paper. The reason for this is that at the end where the thermal transfer sheet on the transparent adherend is superimposed for the flexibility, it is possible to prevent the ink layer from being transferred and to have a sufficient hardness as the support layer. This is because the positioning and the wrinkles generated can be easily avoided and the deformation due to heating is almost eliminated.

The basis weight of the paper is 20 to 180 g / m 2, preferably 80 to 120 g / m 2, based on JIS P8124. The reason is that when it is smaller than 20 g / m 2, it is not easy to avoid the positioning and wrinkles generated during thermal transfer. On the contrary, when it is larger than 180 g / m 2, the end of the thermal transfer sheet on the transparent adherend is overlapped. This is because a portion where the ink layer cannot be transferred is easily generated. The thickness of the paper is preferably 40 to 200 μm, more preferably 60 to 160 μm, particularly preferably 70 to 100 μm. The reason is that if it is thinner than 40 mu m, it is not easy to avoid the positioning and wrinkles generated during thermal transfer, and on the contrary, if it is thicker than 200 mu m, the ink layer may be formed at the end of the thermal transfer sheet on the transparent adherend. This is because a portion that cannot be transferred easily occurs.

Unevenness variation of the surface of the paper is preferably ± 20 μm or less, particularly preferably ± 5 μm or less. The reason is that, when larger than ± 20 µm, it is not easy to arrange the ink layer having a smooth surface in contact with the paper on the support layer. The measuring method of the uneven | corrugated fluctuation of the paper surface is the same as the measuring method of the uneven | corrugated fluctuation in the surface of an ink layer.

Further, another aspect of the present invention relates to a method for producing a thermal transfer sheet of the present invention, (1) applying an ink layer on a process substrate having fluctuations in irregularities of the surface measured on the surface thereof being ± 1 μm, Drying and (2) contacting and laminating the release layer surface on the support layer, which is a paper having a basis weight of 20 to 180 g / m 2, with the ink layer surface on the process substrate, and heating to transfer the ink layer to the release layer. Include.

The process substrate functions to keep the ink layer from peeling until the heating step transfers the ink layer to the peeling layer on the support layer, and in the heat transfer step, the ink layer is peeled off without being destroyed and reliably transferred to the peeling layer surface. It is. The unevenness | corrugation fluctuation measured on the surface of a process base material is ± 1 micrometer or less, Preferably it is less than ± 1 micrometer. If the reason is larger than ± 1 μm, the unevenness of the outer surface of the ink layer transferred to the release layer surface on the support layer becomes large, and the nonuniformity of the ink layer is visually confirmed when transferred to the adherend. Because it gets worse. The measuring method of the uneven | corrugated fluctuation measured on the surface of a process base material is the same as the measuring method of the uneven | corrugated fluctuation in the surface of an ink layer.

The peel strength between the process substrate and the ink layer is preferably 80 to 200 g / m, particularly preferably 100 to 150 g / m. If the reason is less than 80 g / m, the ink layer is easily peeled from the process substrate during the manufacturing process, and if it is larger than 200 g / m, the heat transfer step does not destroy the ink layer in the peeling layer surface on the support layer. This is because it is not easy to die.

The material of the process base material is preferably a plastic film, more preferably a PET film, a polyethylene film, a polypropylene film, a polyvinyl chloride film, and particularly preferably a PET film. The reason for this is that an ink layer having high solvent resistance can be formed even when the ink layer is applied, even if an organic solvent is used, with less fluctuations in surface irregularities. In addition, it is because uneven fluctuation of the surface is ± 1 μm or less, so that it can be supplied inexpensively and stably. The process substrate is preferably surface-treated with a release agent, and particularly preferably treated with silicone oil. This is because it is easy to control the peeling strength between the process substrate and the ink layer in the above-mentioned preferred range.

First, an ink layer is arrange | positioned on a process base material. In this step, the surface of the process substrate side of the ink layer corresponding to the surface side after being transferred to the release layer surface on the support is smoothly formed using the surface of the process substrate having high smoothness. In this step, the ink is preferably applied onto the process substrate by screen printing or application by a roll applicator or knife applicator.

Next, the release layer surface on the support layer and the ink layer surface are superimposed, and the ink layer is positioned to reliably adhere to the release layer surface on the support. The support layer and the exfoliation layer are extruded using a die, and the exfoliated resin melted by heating is laminated on the support layer, and the laminate is passed through two heating rollers while being pressed to join. The combination which combined the support layer and the peeling layer is called "the support layer which has a peeling layer" hereafter.

Next, the support layer having the ink layer and the release layer is pressed while heating, and the ink layer is transferred and adhered to the release layer surface on the support layer. The heating temperature at this time becomes like this. Preferably it is 80-120 degreeC, Especially preferably, it is 80-100 degreeC. The reason is that if the temperature is lower than 80 ° C, the adhesion between the ink layer and the release layer is poor, and if the temperature is higher than 120 ° C, the paper used as the support may be thermally deformed. Moreover, the pressurization pressure at this time becomes like this. Preferably it is 2-6 kg / cm <2>, More preferably, it is 4-5 kg / cm <2>. The reason is that if the pressure is lower than 2 kg / cm 2, the adhesion between the ink layer and the release layer is poor, and if the pressure is higher than 6 kg / cm 2, deformation of the support layer and the ink layer may occur. In addition, a general heat laminating machine is used for the heat transfer at this time. Preferably, a method in which a layer formed by contacting a release layer surface on a support layer with an ink layer surface on a process substrate is pressed while passing between two heating rolls, and then a process substrate is peeled off is used.

This process is shown in FIG.

The cross-sectional view of an example of the thermal transfer sheet of this invention obtained in this way is shown in FIG.

In these drawings, reference numeral (1) denotes an ink layer, (2) a release layer containing a thermoplastic resin, (3) a support layer, (4) a support layer having a release layer, and (5) a thermoelectric (4) is a process base material, (7) is a heating roll. In FIG. 1, an arrow shows the advancing direction of a process base material and an ink layer.

Example

Although the Example of this invention is shown below, this invention is not limited by these.

Example 1

The ink liquid for ink layers was manufactured by the following formulation.

GV-152 (screen ink for vinyl chloride made by NAZ-DAR, blue) 56 parts by weight

GV-170 (clear ink for color tablets made by NAZ-DAR company) 30 weight part

4 parts by weight of ADOMEX770 (polyester-based polymer plasticizer manufactured by Nudex)

10 parts by weight of methyl isobutyl ketone (solvent)

100 parts by weight

The said ink liquid was apply | coated on the process base material using the knife applicator, and the ink layer whose dry thickness is 10 micrometers was obtained. The process base material used at this time was the film in which the surface was silicone oil-treated (the peelable polyethylene terephthalate film, the brand name "Purex" from Dade Co., Ltd.). Next, a support layer having a release layer was prepared by laminating a release layer made of an ethylene-vinyl acetate resin layer on a processed paper having a basis weight of 90 g / m 2, and the release layer of the support layer having the release layer and the process substrate. The ink layer and the release layer were adhered by contacting the ink layer of the upper layer to form a laminate, and the laminate was passed between two pressing rolls while heating the laminate. At this time, heating temperature was 100 degreeC and pressing force was 4.0 kg / m <2>. Subsequently, after cooling the temperature of a laminated body to 40 degrees C or less, the process base film was peeled from a red worm body, and the thermal transfer sheet of this invention was obtained. The support layer with the peeling layer of this Example is a brand name "Technical Paper" (product number: EV-100) by the Schoeller company whose thickness of the processed paper itself is 140 micrometers, and the thickness of a peeling layer is 100 micrometers, The ethylene of this peeling layer The vinyl acetate resin contains 21% by weight of a vinyl acetate component.

Using the thermal transfer sheet and the vacuum thermal transfer apparatus (trade name "Scotch Lite" vacuum applicator VAL-4 (5 x 12 feet) manufactured by 3M) of this example, an ink layer was transferred onto a plastic sheet to prepare an evaluation sample. . As the plastic sheet, a brand name Panagraphics (product number: # 930) (white translucent vinyl chloride sheet) manufactured by 3M Corporation was used. In the transfer method of this embodiment, first, a laminate in which the ink layer surface of the thermal transfer sheet and the surface of the plastic sheet were brought into contact with the bottom of the vacuum apparatus was depressurized. Subsequently, it heated for a predetermined time using the heating lamp in the upper part in a vacuum apparatus. The decompression degree at this time was 670 mmHg, the heating temperature was 107 ° C, and the heating time was 1 minute. Thereafter, the temperature of the laminate was cooled to 40 ° C. or lower, and then the laminate was removed from the vacuum apparatus, and the support layer was peeled off to complete thermal transfer.

Table 1 shows the evaluation results for the "inner appearance", "eye comfort test" and "fold wrinkle" of the evaluation sample.

Here, "inner tank exterior" is an evaluation of the transmission appearance which can be confirmed by Im distance by irradiating light of a fluorescent lamp from the back surface side of the 1 m <2> plastic sheet to which the ink layer was transferred. At this time, the case where color unevenness, spots, streaks, and gloss nonuniformity of color did not appear was "good", and the case where it was not was "bad".

"Study test" is an evaluation of the extent to which the transmitted light leaks from the portion of the ink layer transferred by superimposing two thermal transfer sheets (see FIG. 3). Specifically, first, two thermal transfer sheets are superposed about 5 mm on the plastic sheet to transfer the ink layer. And light is irradiated from the back surface side in which the ink layer of the plastic sheet was not transferred, and the width of the light leakage part of the overlap part is measured with a slide caliper. At this time, the case where the width | variety of the light leakage part was less than 0.5 mm was "good", and the case where it was 0.5 mm or more was made into "defect".

"Folded wrinkles" is an evaluation of the extent to which folded wrinkles are generated when positioning and unrolling a 1 m X 2 m thermal transfer sheet on a plastic sheet. It is a good product that there are no folded wrinkles, or only a part of the wrinkles is generated, but it is a defective product that the wrinkles are generated in the whole.

Example 2

A support layer having a release layer was converted into a laminate of a release layer composed of two layers of an ionomer resin layer (ink side) and an ethylene-vinyl acetate resin layer (paper side) on a processed paper having a basis weight of 100 g / m 2. Example 1 was repeated except otherwise. This support layer is trade name "Heat Transfer Paper" (product number: C-66661) made by Kimberly-Clark Corporation. The thickness of the processed paper itself is 80 µm, the thickness of the release layer is 40 µm, and the ethylene-vinyl acetate resin of the release layer. Contains 21% by weight of a vinyl acetate component. Table 1 shows the evaluation results of the obtained evaluation samples.

Example 3

Example 1 was repeated except having converted the support layer which has a peeling layer into what laminated | stacked the peeling layer which consists of an ethylene-vinyl acetate resin layer on the processed paper which is 22 g / m <2> in basic weight. The support layer was obtained by laminating a release layer made of ethylene-vinyl acetate resin on the trade name "New Soflon" (product number: M # 200) manufactured by Unitech Co., Ltd., and the thickness of the processed paper itself was 50 µm, and the thickness of the release layer was 50 micrometers and the ethylene-vinyl acetate resin of the peeling layer contain 21 weight% of vinyl acetate components. Table 1 shows the evaluation results of the obtained evaluation samples.

Example 4

Example 1 was repeated except having converted the support layer which has a peeling layer into what laminated | stacked the peeling layer which consists of an ethylene-vinyl acetate resin layer on the processed paper of 143 g / m <2> in a basis weight. This support layer is a trade name "Heat TransferPaper" (product number: S-52159) manufactured by Kimberly Clark, the thickness of the processed paper itself is 80 µm, the thickness of the release layer is 50 µm, and the ethylene-vinyl acetate resin of the release layer is 21 weight% of vinyl acetate components are contained. Table 1 shows the evaluation results of the obtained evaluation samples.

Example 5

Example 1 was repeated except having converted the support layer which has a peeling layer into what laminated | stacked the peeling layer which consists of an ethylene-vinyl acetate resin layer on the processed paper of a basis weight of 170 g / m <2>. This support layer was produced experimentally, the thickness of the processed paper itself was 200 µm, the thickness of the release layer was 50 µm, and the ethylene-vinyl acetate resin of the release layer contained 21% by weight of a vinyl acetate component. Table 1 shows the evaluation results of the obtained evaluation samples.

1 in comparison

Example 1 was repeated except that the ink layer was applied directly to the release layer. Table 1 shows the evaluation results of the obtained evaluation samples.

Comparative Example 2

Example of the invention except that the support layer having the release layer was laminated with a release layer composed of an ethylene-vinyl acetate resin layer laminated on a processed paper having a basis weight of 18 g / m 2, and the ink layer was directly applied to the support layer. Repeated 1 This support layer was produced for this comparative example, the thickness of the processed paper itself is 36 micrometers, the thickness of a peeling layer is 50 micrometers, and the ethylene-vinyl acetate resin of this peeling layer contains 28 weight% of vinyl acetate components. Table 1 shows the evaluation results of the obtained evaluation samples.

Comparative Example 3

An example was carried out except that the support layer having the release layer was laminated with a release layer composed of an ethylene-vinyl acetate resin layer laminated on a processed paper having a basis weight of 190 g / m 2, and the ink layer was applied directly to the support layer. Repeated 1 This support layer was produced for this comparative example, and the thickness of the processed paper itself is 210 micrometers, and the thickness of a peeling layer is 50 micrometers The ethylene-vinyl acetate resin of this peeling layer contains 28 weight% of vinyl acetate components. Table 1 shows the evaluation results of the obtained evaluation samples.

Comparative Example 4

Except for converting the support layer having the release layer to a laminate of a release layer made of an ethylene-vinyl acetate resin layer on a polyethylene terephthalate film having a thickness of 50 μm, and also applying an ink layer directly to the support layer, Repeated 1 The support layer which has this peeling layer is a branding "tetron Type S" of Taging, the thickness of a peeling layer is 50 micrometers, and the ethylene-vinyl acetate resin of this peeling layer contains 21 weight% of vinyl acetate components. Table 1 shows the evaluation results of the obtained evaluation samples.

Comparative Example 5

The support layer having the release layer was converted to a laminate of a release layer made of an ethylene-vinyl acetate resin layer on a polyethylene terephthalate film having a thickness of 100 μm, and the ink layer was applied directly to the support layer, except for Repeated 1 This support layer was a brand name "tetron Type S" of Taging, the thickness of a peeling layer is 100 micrometers, and the ethylene-vinyl acetate resin of this peeling layer contains 21 weight% of vinyl acetate components. Table 1 shows the evaluation results of the obtained evaluation samples.

Table 1

*) EVA = ethylene-vinyl acetate resin, **) PET = polyester film

The present invention suppresses the unevenness of the shade of the ink layer transferred onto a transparent or translucent adherend by reducing the uneven fluctuation of the surface of the ink layer, thereby improving the appearance, and (2) the ink layer on the adherend. The positioning at the time of transfer can be facilitated to prevent the occurrence of wrinkles when transferring at the same time, and the wrinkles can be easily avoided even if they occur. (3) On the transparent or translucent adherend, thermoelectric There can be provided a thermal transfer sheet which has no portion which is not transferred even at the end portion of the ink layer of the overlapped portion of the yarn sheets, and at the same time allows the light to pass through the transparent adherend after ink layer transfer.

1 is a process chart when producing the thermal transfer sheet of the present invention.

2 is a cross-sectional view of an example of the thermal transfer sheet of the present invention.

3 is an explanatory diagram illustrating a relationship in which a portion which is not transferred at an end portion of an ink layer occurs in a portion where a thermal transfer sheet is superimposed on a transparent or translucent adherend, respectively.

Explanation of symbols on the main parts of the drawings

1: ink layer

2: release layer containing thermoplastic resin

3: support layer 4: support layer with release layer

5: thermal transfer sheet 6: process description

7: heating roll

Claims (6)

In the thermal transfer sheet in which an ink layer, a release layer containing a thermoplastic resin, and a support layer are laminated in this order, the support layer is paper having a basis weight in a range of 20 to 180 g / m 2, and both surfaces of the ink layer. Thermal transfer sheet having uneven fluctuations measured at ± 1 μm or less. The method of claim 1, The heat transfer sheet whose said peeling layer is a peeling layer containing ethylene-vinyl acetate resin. The method according to claim 1 or 2, The release layer has a layer containing an ionomer resin on the ink layer side, The thermal transfer sheet which consists of two layers which has a layer containing an ethylene-vinyl acetate resin in the support body side. (1) applying and drying an ink layer on a process substrate having uneven fluctuations measured at a surface of ± 1 μm or less, and (2) Laminating and heating the contact layer surface of the laminate formed by laminating a release layer containing a thermoplastic resin on a support layer which is a paper having a basis weight of 20 to 180 g / m 2 and an ink layer on a process substrate. And transferring the ink layer to the release layer. The method of claim 4, wherein The said peeling layer is a peeling layer containing ethylene-vinyl acetate resin, The manufacturing method of the thermal transfer sheet characterized by the above-mentioned. The method according to claim 4 or 5, The said peeling layer has a layer containing an ionomer resin in an ink layer, and consists of two layers which have a layer containing an ethylene-vinyl acetate resin in the support body side, The manufacturing method of the thermal transfer sheet characterized by the above-mentioned.