JP2010082913A - Thermal transfer image receiving sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal transfer image receiving sheet exhibiting high security such that when a printed material obtained by forming an image on the thermal transfer image receiving sheet is stuck to a personal history or the like by applying glue and after that, pealed off, the personal history clearly indicates that the printed material is peeled-off or when a stamp or the like is peeled off after pasted on the back surface layer of the thermal transfer image receiving sheet, the thermal transfer image receiving sheet clearly indicates the peeling-off. <P>SOLUTION: The thermal transfer image receiving sheet 1 formed by providing a dye receptive layer 3 on one surface of a base material sheet 2 and a back surface layer 5 containing filler on the other surface of the base material sheet 2 is provided with a back surface intermediate layer 4 between the base material 2 and the back surface layer 5. The back surface intermediated layer 4 comprises polyurethane and contains no isocyanate compound and the back surface layer 5 contains polyvinyl butylal and polyvinyl pyrrolidone. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thermal transfer image-receiving sheet, and in particular, when a printed material on which an image is formed on a thermal transfer image-receiving sheet is attached to a resume or the like and then adhered, The present invention relates to a thermal transfer image-receiving sheet that can clearly show that it has been peeled off, and that it has also been peeled off on the side of the printed material that has been peeled off. In addition, when a stamp or the like is attached to the back layer of the thermal transfer image receiving sheet and then the stamp or the like is peeled off from the thermal transfer image receiving sheet, it can be clearly shown on the thermal transfer image receiving sheet that the peeled off stamp has been removed. The present invention relates to a high-security thermal transfer image-receiving sheet that can prevent reuse.

  Conventionally, in a thermal transfer image receiving sheet, a color material receiving layer is provided on the surface to improve the acceptability and retention of a color material such as a dye, and at the same time, the back side of the thermal transfer image receiving sheet is transported such as automatic paper supply and discharge in a printer. In order to improve the performance, to prevent the thermal transfer sheet and the image-receiving sheet from being fused when the image-receiving sheet is inserted into the printer by mistake, and when the image-receiving sheet after printing is stored in an overlapping manner In addition, for the purpose of preventing dyes, etc. from moving to the back side and lowering the image density on the front side or contaminating the back side, the back side is provided with appropriate slipperiness, releasability and stain resistance. It has been practiced to provide a back surface layer for this purpose.

  In recent years, the need to use the thermal transfer image-receiving sheet as a postcard such as a picture postcard has increased, and on the surface of the image-receiving sheet, for example, a color image such as a photograph is thermally transferred, and on the back surface, in addition to the above performance, In order to write an address, a sent message, or affix a stamp, it has become necessary to add writing ability and adhesiveness to the stamp. In addition, a print such as a photo of a face photograph is formed on the surface of the thermal transfer image-receiving sheet by thermal transfer, and the print is cut into a predetermined size including the image. It has become necessary to apply and adhere.

  As a method for meeting such needs, for example, Patent Document 1 proposes a thermal transfer image-receiving sheet having an intermediate layer made of a reactive curable resin containing an isocyanate compound between a base material and a back surface layer of the thermal transfer image-receiving sheet. . Moreover, in patent document 2, in order to improve adhesiveness between the base material sheet and the back surface layer containing amino acid type powder, forming the primer layer which added the isocyanate to urethane resin is shown. .

  However, in the thermal transfer image receiving sheet as mentioned above, affixing a stamp or the like to the back layer, affixing the stamp with glue provided on the back of the stamp, and then peeling off the stamp, No effective precautions have been taken. Also, with the conventional thermal transfer image-receiving sheet listed above, the printed material cut to a predetermined size is pasted on the back of the printed material on a resume, etc., and then adhered, and then the printed material is peeled off. No effective preventive measures have been taken against this. In other words, after applying the glue to the back of the printed material and pasting it on the resume, etc., when the printed material was peeled off, the printed material was removed cleanly from the resume and was peeled off the surface of the resume I do not know clearly. In addition, once the stamp is attached to the back surface layer of the thermal transfer image receiving sheet, and then the stamp is peeled off from the thermal transfer image receiving sheet, it can be seen that the stamp is peeled off from the back surface layer and peeled off from the back surface layer of the thermal transfer image receiving sheet. There is no problem.

Japanese Patent No. 3341218 JP 2005-313595 A

Therefore, the present invention has been made in view of such a situation,
When the printed matter on which the image is formed on the thermal transfer image-receiving sheet is pasted by applying glue to the resume, etc., and then peeling off the printed matter, the fact that the peeled off is clearly shown to the resume Further, the present invention relates to a thermal transfer image-receiving sheet that can be peeled off on the side of the printed product that has been peeled off. In addition, when a stamp or the like is attached to the back layer of the thermal transfer image receiving sheet and then the stamp or the like is peeled off from the thermal transfer image receiving sheet, it can be clearly shown on the thermal transfer image receiving sheet that the peeled off stamp has been removed. An object of the present invention is to provide a thermal transfer image-receiving sheet with high security capable of preventing reuse.

  The thermal transfer image-receiving sheet of the present invention is the thermal transfer image-receiving sheet according to claim 1, wherein a dye-receiving layer is provided on one side of the base sheet, and a back layer containing a filler is provided on the other side of the base sheet. A back surface intermediate layer is provided between the base sheet and the back surface layer, the back surface intermediate layer is made of polyurethane, an isocyanate compound is not added, and the back surface layer contains polyvinyl butyral and polyvinyl pyrrolidone. When a sticker or the like is affixed on the back surface layer, and then the adhesive sheet is peeled off from the thermal transfer image receiving sheet, the back surface layer of the thermal transfer image receiving sheet is peeled off together with the back surface intermediate layer. The back side is exposed, and the difference in gloss between the part where the back layer is peeled off (exposed surface of the base sheet) and the adjacent part (the back side layer) clearly shows that it was peeled off. It is intended. Therefore, the heat transfer image-receiving sheet is highly secure and has an effective preventive measure against bad things by peeling off the patch.

  In addition, the thermal transfer image receiving sheet having the above-described configuration is applied to the resume side when the printed matter on which the image is formed on the thermal transfer image receiving sheet is attached to the resume or the like and then adhered. It is possible to clearly show that the peeling has occurred. Therefore, the heat transfer image-receiving sheet is highly secure and has an effective preventive measure against bad things by peeling off the patch.

  According to a second aspect of the present invention, the back layer further contains a silicone-modified resin. As a result, it is possible to further improve the anti-blocking property when the thermal transfer image-receiving sheets are stacked and the slipping property such as the conveyance property in the printer.

  As described above, the thermal transfer image-receiving sheet of the present invention has a history when the printed matter on which the image is formed on the thermal transfer image-receiving sheet is attached to the resume and pasted, and then the printed matter is peeled off. It can be clearly shown on the writing side that it has been peeled off, and it is also shown that it has been peeled off on the side of the printed material. Further, it is possible to prevent reuse and misuse in both the resume from which the printed material has been peeled off and the printed material from which the printed material has been peeled off. In addition, when a stamp or the like is attached to the back surface layer of the thermal transfer image receiving sheet and then the stamp or the like is peeled off from the thermal transfer image receiving sheet, it can be clearly shown on the thermal transfer image receiving sheet that the peeling has been done. Can be prevented from being reused. Further, it is possible to prevent reuse and abuse of both the thermal transfer image-receiving sheet from which the stamp has been peeled off and the stamp from which the stamp has been peeled off. In both cases, the security was high and it was very useful.

FIG. 1 is a schematic cross-sectional view showing one embodiment of the thermal transfer image-receiving sheet 1 of the present invention. A dye-receiving layer 3 is provided on one surface of a substrate sheet 2 and the other surface of the substrate sheet 2 is provided. The back layer 5 containing the filler is provided through the back surface intermediate layer 4.
FIG. 2 is a schematic diagram for explaining a state after a stamp is attached to the back layer of the thermal transfer image receiving sheet of the present invention and when the stamp is peeled off from the thermal transfer image receiving sheet. As shown in FIG. 2, a stamp 6 is applied to the back surface layer 5 of the thermal transfer image receiving sheet having a back surface intermediate layer 4 and a back surface layer 5 provided on the opposite surface of the base sheet 2 provided with the dye receiving layer 3. After applying water to the adhesive provided on the back surface to give adhesiveness, a stamp 6 was attached. Thereafter, as shown in the lower part of FIG. 2, when the stamp 6 is peeled off from the thermal transfer image receiving sheet, the stamp 6 is peeled off from the base sheet 2 in a state where the back surface intermediate layer 4 and the back surface layer 5 are laminated, The back surface side of the base material sheet 2 is exposed, and it is clearly shown that the back surface layer is peeled off due to the difference in gloss between the back surface layer (exposed surface of the base material sheet) and the adjacent portion (back surface layer). .

  On the other hand, FIG. 3 is a schematic diagram for explaining the state after the stamp is applied to the back layer of the conventional thermal transfer image receiving sheet and when the stamp is peeled off from the thermal transfer image receiving sheet. As shown in the upper part of FIG. 3, a stamp 6 is applied to the back surface layer 5 of the thermal transfer image receiving sheet having a back surface intermediate layer 4 and a back surface layer 5 provided on the opposite surface of the base sheet 2 provided with the dye receiving layer 3. After applying water to the adhesive provided on the back surface to give adhesiveness, a stamp 6 was attached. Thereafter, as shown in the lower part of FIG. 3, when the stamp 6 is peeled off from the thermal transfer image receiving sheet, the stamp 6 is peeled off from the back surface layer 5, and the stamp is peeled off from the back surface layer of the thermal transfer image receiving sheet. I do not understand.

  FIG. 4 is a schematic diagram for explaining a state in which the printed material on which the image is formed on the thermal transfer image-receiving sheet of the present invention is bonded to the resume 7 and glued, and when the printed material is peeled off. is there. As shown in the upper part of FIG. 4, the pasted material 7 of the resume was adhered with glue so that the back surface layer 5 of the thermal transfer image receiving sheet was in contact therewith. Thereafter, as shown in the lower part of FIG. 4, when the printed material is peeled off from the resume 7, the back surface intermediate layer 4 and the back surface layer 5 remain on the resume 7 side, and the substrate on which the dye receiving layer 3 is provided. Sheet 2 is separated from resume 7. As a result, the back surface intermediate layer 4 and the back surface layer 5 are laminated on the resume 7 side at the part where the printed material is peeled off from the resume 7, and the part adjacent to the peeled part is the resume surface and is peeled off The difference in gloss between the part and the adjacent part and the difference in smoothness clearly show that the part has been peeled off.

  On the other hand, FIG. 5 illustrates a state in which a printed material on which an image is formed on a conventional thermal transfer image-receiving sheet is pasted with glue applied to the resume 7 and the printed material is peeled off. FIG. As shown in the upper part of FIG. 5, the pasted material 7 of the resume was adhered with glue so that the back surface layer 5 of the thermal transfer image receiving sheet was in contact therewith. After that, as shown in the lower part of FIG. 5, when the printed matter is peeled off from the resume 7, the printed matter is neatly peeled off from the resume 7, and the printed matter attached to the surface of the resume 7 is peeled off. I do n’t know.

Hereinafter, each layer constituting the thermal transfer image receiving sheet of the present invention will be described in detail.
(Substrate sheet)
As the base sheet 2 used in the present invention, synthetic paper (polyolefin type, polystyrene type, etc.), fine paper, art paper, coated paper, cast coated paper, wallpaper, backing paper, synthetic resin or emulsion impregnated paper, synthetic rubber Various types of plastic films or sheets such as latex-impregnated paper, synthetic resin-incorporated paper, cellulose fiber paper such as paperboard, polyolefin (polyethylene, polypropylene, etc.), polystyrene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, polymethacrylate, etc. can be used. Moreover, a white opaque film formed by adding a white pigment or a filler to these synthetic resins, or a film having fine voids (micro voids) inside the substrate can be used, and is not particularly limited. Moreover, the laminated body by the arbitrary combinations of the said base material sheet can also be used.

  However, in the present invention, after sticking a stamp or the like on the back surface layer, when the stamp or the like is peeled off from the thermal transfer image receiving sheet, the base sheet to be used is shown in order to clearly show that the thermal transfer image receiving sheet has been peeled off. The surface, particularly the back side surface, is preferably highly smooth and glossy. The reason for this is to clearly show that the peeled portion of the back layer has been peeled off due to the difference in gloss between the peeled portion and the adjacent portion. The part where the back layer is peeled is exposed to the base sheet (back side) and is highly glossy, and the part adjacent to the peeled part has a back layer and the surface has minute irregularities. Therefore, the glossiness is low.

  The thickness of the substrate sheet may be arbitrary, and for example, a thickness of about 10 to 300 μm is common. When the base sheet as described above has poor adhesion to the dye-receiving layer formed on the surface thereof, it is preferable to subject the surface to easy adhesion treatment such as primer treatment, corona discharge treatment or plasma treatment.

(Dye-receiving layer)
The dye receiving layer 3 in the thermal transfer image receiving sheet in the present invention is for receiving the sublimation dye transferred from the thermal transfer sheet and maintaining the formed image. The resin for forming the receiving layer includes polycarbonate resin, polyester resin, polyamide resin, acrylic resin, cellulose resin, polysulfone resin, polyvinyl chloride, polyvinyl acetate, and vinyl chloride-vinyl acetate. Examples thereof include polymer resin, polyvinyl acetal, polyvinyl butyral, polyurethane resin, polystyrene resin, polypropylene resin, polyethylene resin, ethylene-vinyl acetate copolymer resin, and epoxy resin.

  The thermal transfer image-receiving sheet of the present invention can contain a release agent in the receiving layer in order to improve the releasability from the thermal transfer sheet. Various release agents such as solid waxes such as polyethylene wax, amide wax, Teflon (registered trademark), fluorine-based or phosphate-based surfactant, silicone oil, reactive silicone oil, curable silicone oil, etc. Silicone oil, various silicone resins and the like can be mentioned, and silicone oil is preferable. An oily oil can be used as the silicone oil, but a curable oil is preferred. Examples of the curable silicone oil include a reaction curable type, a photo curable type, and a catalyst curable type, and a reaction curable type and a catalyst curable type silicone oil are particularly preferable.

  The addition amount of these curable silicone oils is preferably 0.5 to 30% by mass of the resin constituting the receiving layer. Further, the release agent layer can be provided by applying the above release agent dissolved or dispersed in a suitable solvent on a part of the surface of the receiving layer, followed by drying. As the release agent constituting the release agent layer, the reaction cured product of the amino-modified silicone oil and the epoxy-modified silicone oil described above is particularly preferable, and the thickness of the release agent layer is 0.01 to 5.0 μm, particularly 0.05-2.0 micrometers is preferable. When forming the receptor layer by adding silicone oil, the release agent layer can be formed even if the silicone oil bleed out on the surface after application is cured. In the formation of the receiving layer, pigments such as titanium oxide, zinc oxide, kaolin, clay, calcium carbonate, fine powder silica and the like are used for the purpose of improving the whiteness of the receiving layer and further enhancing the clarity of the transferred image. Fillers can be added. Further, a plasticizer such as a phthalic acid ester compound, a sebacic acid ester compound, or a phosphoric acid ester compound may be added.

The thermal transfer image-receiving sheet of the present invention has a thermoplastic resin as described above and other necessary additives such as a mold release agent, a plasticizer, a filler, a crosslinking agent, and a curing agent on at least one surface of the base sheet. , A catalyst, a heat release agent, an ultraviolet absorber, an antioxidant, a light stabilizer, and the like are dissolved in a suitable organic solvent, or a dispersion dispersed in an organic solvent or water is used, for example, a gravure printing method It is obtained by applying and drying by a forming means such as a screen printing method or a reverse roll coating method using a gravure plate to form a dye receiving layer. The coating amount of the thus formed are dye-receiving layer, usually, 0.5 to 50 g / m ² approximately in the dry state, preferably 2 to 10 g / m ^2. Such a dye-receiving layer is preferably a continuous coating, but may be formed as a discontinuous coating.

(Middle layer)
Between the dye-receiving layer and the base sheet, for the purpose of imparting adhesion, whiteness, cushioning, concealing, antistatic, anti-curl, etc. between the dye-receiving layer and the base sheet, a conventionally known Any intermediate layer can be provided. Binder resin used for the intermediate layer is polyurethane resin, polyester resin, polycarbonate resin, polyamide resin, acrylic resin, polystyrene resin, polysulfone resin, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate. Copolymer resin, polyvinyl acetal, polyvinyl butyral, polyvinyl alcohol, epoxy resin, cellulose resin, ethylene-vinyl acetate copolymer resin, polyethylene resin, polypropylene resin, and the like, and active hydroxyl group among these resins In addition, those having a cured product of isocyanate can be used as a binder.

Moreover, it is preferable to add fillers such as titanium oxide, zinc oxide, magnesium carbonate, and calcium carbonate in order to impart whiteness and concealability. In addition, stilbene compounds, benzimidazole compounds, benzoxazole compounds, etc. are added as fluorescent brighteners to enhance whiteness, and hindered amine compounds, hindered phenol compounds to enhance the light resistance of printed materials. Benzotriazole compounds, benzophenone compounds, etc. may be added as UV absorbers or antioxidants, or cationic acrylic resins, polyaniline resins, various conductive fillers, etc. may be added to impart antistatic properties. it can. The coating amount of the intermediate layer is preferably about 0.5 to 30 g / m ^{2 in} a dry state.

(Back layer)
The back surface intermediate layer 4 is provided between the base material sheet and the back surface layer. The back surface intermediate layer is made of polyurethane and is not added with an isocyanate compound. Polyurethane is a thermosetting resin that has a “cross-linking” reaction in which a side chain that branches out from an elongated polymer (polymer resin) like a chain is bonded to a side chain of another polymer. It progresses at high temperatures, and the polymers become three-dimensionally bonded to each other and cannot move.

  The back surface intermediate layer is made of polyurethane, and the urethane resins are heated and crosslinked. In the back surface intermediate layer, the urethane resin is crosslinked without adding an isocyanate compound for crosslinking and curing to the urethane resin. As a result, compared with the case where an isocyanate compound is added to the urethane resin to crosslink, the adhesiveness with the base material sheet is moderately lowered, and after sticking a stamp or the like on the back layer, the patch is removed from the thermal transfer image receiving sheet. When peeled off, the back surface layer of the thermal transfer image-receiving sheet is peeled off together with the back surface intermediate layer, the back surface side of the base material sheet is exposed, and the back surface layer is peeled off (exposed surface of the base material sheet). ) And the difference in gloss clearly show that it has been peeled off. In addition, after the backside intermediate layer has moderately reduced adhesion to the base sheet, the printed material on which the image has been formed on the thermal transfer image-receiving sheet is attached to the resume, etc., and adhered to the backside of the printed material When the printed material is peeled off, it can be clearly shown on the resume side. In this case, the backside intermediate layer and backside layer of the thermal transfer image-receiving sheet remain in the part where the printed matter of the resume is peeled off, and the difference in glossiness between the part adjacent to the peeled part (the face of the resume) Clearly shows that it has been removed.

  On the other hand, when the back surface intermediate layer is made to add an isocyanate compound to the thermosetting resin, the adhesiveness between the base sheet and the back surface layer becomes strong, and after sticking a stamp or the like on the back surface layer, When peeled off from the thermal transfer image-receiving sheet, the patch is peeled off from the back layer, and it is not known that the peeled off. In addition, the adhesion between the base sheet and the back layer is strengthened, and when the paste is attached to the resume, etc., and then adhered to the back of the printed matter, the printed matter is peeled off to the resume side. It is difficult to find that it has been peeled off.

The method for forming the back surface intermediate layer can be obtained by dissolving polyurethane and, if necessary, adding titanium oxide or the like in an organic solvent to improve whiteness, or dispersing the coating liquid in an organic solvent or water. It is prepared, and this is formed by applying and drying by a gravure printing method, a screen printing method, a reverse roll coating method using a gravure plate, a die coating method or the like. The thickness of the back surface intermediate layer to be formed is generally about 1 to ²⁰ g / m ^{2 in} a dry state. When applying the thermal transfer image-receiving sheet to a resume or the like using glue, by adding the above titanium oxide, the back surface intermediate layer remains in the peeled location, and the surface smoothness is low. The luster is also lost, and it can be clearly shown that it has been peeled off.

(Back layer)
In the thermal transfer image-receiving sheet of the present invention, a dye-receiving layer is provided on one side of the base sheet, and the back layer 5 is formed on the other side of the base sheet. This back layer prevents curling of the image receiving sheet due to the heat of the thermal head during thermal transfer, improves anti-blocking properties when stacked, and slipperiness such as transportability in the printer. When the image is stored in layers, contamination of the back side due to dye transfer on the printing screen is prevented, and after the receptive layer surface before printing and the back surface are stored in layers, the transfer sensitivity of the receptive layer is prevented from decreasing. Provide for. The back layer is formed by using a resin having a low dye dyeing property as a fixing agent and adding an organic filler or an inorganic filler thereto.

  In the present invention, polyvinyl butyral and polyvinylpyrrolidone are used from the viewpoints of the above-mentioned fixing agent, that is, a resin having low dye dyeing property, and also from the viewpoint of writing property, film-forming property, adhesion to water-soluble paste, and the like. The Further, in the present invention, it is preferable to use a silicone-modified resin added to the above-mentioned resin in order to ensure moderate slipperiness on the back layer, releasability from the thermal transfer sheet, and to improve stain resistance against the dye. . The silicone-modified resin may be either a silicone graft polymer or a silicone block polymer. Specific examples include silicone-modified acrylic polymer, silicone-modified polyvinyl alcohol, silicone-grafted polyvinyl butyral, silicone-grafted urethane polymer, silicone-grafted acrylic polymer, and silicone-grafted modified polyvinyl alcohol. In particular, among the above, silicone-grafted polyvinyl butyral is preferably used because it has good compatibility with the fixing agent for polyvinyl resins such as polyvinyl butyral and polyvinylpyrrolidone.

  The filler in the back surface layer improves the transportability of the thermal transfer image-receiving sheet in the printer, and has effects such as blocking prevention. Examples of the organic filler include acrylic filler, polyamide filler, fluorine filler, and polyethylene wax. Of these, a polyamide-based filler is preferable, and a nylon (registered trademark, hereinafter the same) 12 filler is more preferable in terms of excellent water resistance. This is because the nylon 12 filler is superior in water resistance compared to nylon 6 and nylon 66, and there is no change in properties due to water absorption. Examples of inorganic fillers include silicon dioxide and metal oxides. In any of the above fillers, the average particle size of the organic filler and the inorganic filler is 0.01 to 30 μm. If the particle size is too small, the filler will be hidden in the back layer, so that it will not function sufficiently, and if the particle size is too large, the protrusion from the back layer will increase, resulting in friction. This is not preferable because the coefficient is increased or the filler is missing. However, said filler can also be used in mixture of different particle diameters.

  It is preferable that the blending ratio of the filler in the back layer is 0.01 to 100% by mass with respect to the resin component that is a fixing agent for the back layer. When the blending ratio is less than 0.01% by mass, the slipping property is insufficient, and there is a tendency to cause troubles such as paper jam when feeding the printer. On the other hand, if it exceeds 100% by mass, color slippage or the like tends to occur in the printed image, which is not preferable. In addition, by including an amino acid-based powder in the back surface layer, it is possible to effectively prevent troubles in feeding the thermal transfer image-receiving sheet in the printer, and it is also possible to have excellent stamp adhesion, glue adhesion, and writing properties. .

を有する粉体である。式中、ＲはＣ₁₁〜Ｃ₁₇の直鎖アルキル基を表している。好ましいアミノ酸系粉体は、下記化学式（ＩＩ）を有するＮε−ラウロイル−Ｌ−リジンからなる平板状粉体である。

The amino acid powder is represented by the following chemical formula (I) obtained from L-lysine and a long-chain alkyl acid:

It is the powder which has. In the formula, R represents a C _{11 to} C ₁₇ linear alkyl group. A preferred amino acid powder is a flat powder made of Nε-lauroyl-L-lysine having the following chemical formula (II).

  The amino acid powder can be obtained by heating a lysine alkyl salt obtained from a long-chain alkyl acid and L-lysine in a non-polar solvent such as liquid paraffin or xylene. Nε-lauroyl-L-lysine powder is available from Ajinomoto Takara Corporation as Amihope LL ™.

  The amino acid-based powder is a powder having an average particle diameter of 10 to 20 μm and is present in the back surface layer in a state of being dispersed in the binder resin. The amino acid-based powder is used in an amount of 25 to 200% by mass, preferably 50 to 150% by mass, based on the binder resin. If the amount is too large, there is a problem that the film formability and adhesiveness are insufficient. If the amount is too small, a desired coefficient of friction cannot be obtained, and the back surface releasability cannot be obtained. Note that the reverse side releasability is a performance required for the user to put the thermal transfer image receiving sheet into the printer with the wrong side and to print it, and the thermal transfer sheet and the back layer of the thermal transfer image receiving sheet are discharged from the printer without fusing. .

The method for forming the back layer is usually such that a filler or the like is added to the fixing resin within the above-mentioned appropriate range, and if necessary, a necessary additive is dissolved in an organic solvent, or an organic solvent A coating liquid is prepared by dispersing in water or water, and this is formed by applying and drying by a gravure printing method, a screen printing method, a reverse roll coating method using a gravure plate, a die coating method or the like. The thickness of the back layer to be formed is preferably 0.5 to 5 g / m ^{2 in} a dry state. When the coating amount is less than 0.5 g / m ² , writing property and adhesiveness are insufficient. In addition, an application amount exceeding 5 g / m ² is not necessary because it is not necessary, and conversely, the material and processing cost also increase.

(Attachment)
When the printed material image-formed on the thermal transfer image-receiving sheet of the present invention is used by applying glue and adhering to a resume or the like, the pasted article 7 such as the resume is the one of the thermal transfer image-receiving sheet described above. The same substrate sheet can be used. However, in the present invention, after the printed matter on which an image is formed on the thermal transfer image-receiving sheet is pasted with a paste attached to the resume, etc., and when the printed matter is peeled off, the printed matter is peeled off from the resume etc. In order to clearly show this, it is preferable that the object to be used has a highly smooth surface and high gloss. Because, in the part where the printed matter such as the resume is peeled off, the back surface intermediate layer and the back layer remain on the resume side, the adjacent part of the peeled part is the resume surface, the peeled part, This is to increase the difference in gloss between the adjacent portions and the difference in smoothness.

Next, the present invention will be described more specifically with reference to examples. Hereinafter, unless otherwise specified, parts or% is based on mass.
Example 1
Wire bar so that the following back surface intermediate layer coating solution is dried to 1.25 g / m ² on one side of a 25 μm thick transparent PET (trade name “25T60” manufactured by Toray Industries, Inc.) as a base sheet. The back layer was formed by coating and natural drying to form a back surface intermediate layer, and the following back layer coating solution was applied to the surface and dried to 1.5 g / m ² when dried. . Thereafter, an intermediate layer coating solution having the following composition is applied to the surface opposite to the back surface layer of the base sheet by wire bar coating, and dried so that the dry coating amount is 2.0 g / m ^2. Formed. On the intermediate layer, a dye receptive layer coating solution having the following composition was applied by wire bar coating so that the dry coating amount was 4.0 g / m ² and dried to form a dye receptive layer. Then, it dried at 100 degreeC for 5 minute (s), and obtained the thermal transfer image receiving sheet of this invention.

(Back surface intermediate layer coating solution)
Polyurethane resin (N-5199, manufactured by Nippon Polyurethane Industry Co., Ltd.) 100 parts Titanium oxide (TCA-888, manufactured by Tochem Products) 200 parts Methyl ethyl ketone 200 parts Toluene 200 parts Isopropyl alcohol 100 parts

(Coating liquid for back layer)
Butyral resin (Denka Butyral # 3000-1, manufactured by Denki Kagaku Kogyo Co., Ltd.)
100 parts Polyvinylpyrrolidone resin (K-90, ISP Japan) 60 parts Silicone-modified resin (silicone graft polyvinyl butyral, Dialomer SP712, manufactured by Dainichi Seika Kogyo Co., Ltd.) 40 parts Amino acid powder (Amihop LL, manufactured by Ajinomoto Co., Inc.) ) 100 parts Nylon filler (MW330, manufactured by Shinto Fine Co., Ltd.) 100 parts Methyl ethyl ketone 900 parts Toluene 900 parts Isopropyl alcohol 450 parts

(Intermediate layer coating solution)
Polyurethane resin (N-5199, manufactured by Nippon Polyurethane Industry Co., Ltd.) 25.0 parts Titanium oxide (TCA-888, manufactured by Tochem Products) 75.0 parts Methyl ethyl ketone 200 parts Toluene 200 parts

(Dye-receiving layer coating solution)
Vinyl chloride-vinyl acetate copolymer (Solvine C, Nissin Chemical Industry Co., Ltd.) 100 parts Epoxy-modified silicone (Shin-Etsu Chemical Co., Ltd., X-22-3000T) 5.0 parts Methyl ethyl ketone 200 parts Toluene 200 parts

(Example 2)
A thermal transfer image receiving sheet of Example 2 was prepared in the same manner as in Example 1 except that the back layer coating solution was changed to the following in the thermal transfer image receiving sheet of Example 1 described above.
(Coating liquid for back layer)
Butyral resin (Denka Butyral # 3000-1, manufactured by Denki Kagaku Kogyo Co., Ltd.)
130 parts Polyvinylpyrrolidone resin (K-90, ISP Japan) 70 parts Amino acid powder (Amihop LL, manufactured by Ajinomoto Co., Inc.) 100 parts Nylon filler (MW330, manufactured by Shinto Fine Co., Ltd.) 100 parts Methyl ethyl ketone 900 parts Toluene 900 parts Isopropyl alcohol 450 parts

(Comparative Example 1)
Using the same base material sheet as in Example 1, the following back surface intermediate layer coating solution was applied on a single side with a wire bar and dried naturally so that the back surface intermediate layer coating liquid was 1.25 g / m ² when dried. An intermediate layer and a dye having the same composition and thickness as those of Example 1 are formed on the surface thereof, and the back surface layer having the same composition as that of Example 1 and further on the side opposite to the surface provided with the back surface layer of the base sheet. A receiving layer was formed to obtain a thermal transfer image receiving sheet of Comparative Example 1.
(Back surface intermediate layer coating solution)
Polyurethane resin (N-5199, manufactured by Nippon Polyurethane Industry Co., Ltd.) 100 parts Titanium oxide (TCA-888, manufactured by Tochem Products) 200 parts Isocyanate compound (Takenate A-14, manufactured by Takeda Pharmaceutical Co., Ltd.) 5 parts Methyl ethyl ketone 200 parts Toluene 200 parts Isopropyl alcohol 100 parts

  The following evaluations 1 and 2 were performed on the thermal transfer image-receiving sheets of the present invention and the comparative example obtained above, and the results are shown in Table 1.

(Evaluation 1)
Apply the glue on the back of each thermal transfer image-receiving sheet using the following glue, paste it on plain paper, leave it in a room at 25 ° C for 24 hours, peel off each thermal transfer image-receiving sheet from the plain paper, and evaluate according to the following criteria Went.
The paste used is Fuki paste manufactured by Non-Gai Kogyo Co., Ltd. and Arabic Yamato manufactured by Yamato Co., Ltd.
Evaluation standard (circle): After the thermal transfer image-receiving sheet is pasted with glue on the surface of plain paper, it can be clearly determined that the sticking has been peeled off. That is, on the surface of the plain paper, the back layer of the thermal transfer image receiving sheet remains on the plain paper side together with the back surface intermediate layer at the portion where the patch is peeled off.
X: On the surface of plain paper, after the thermal transfer image receiving sheet is pasted with glue, it cannot be clearly determined that the sticking has been peeled off. That is, the back layer of the thermal transfer image receiving sheet does not remain on the surface of the plain paper where the patch is peeled off. (Transparent glue remains, but not very noticeable)

(Evaluation 2)
Tap water was applied to half of the adhesive surface of the 50 yen stamp of Japan Post, and the above stamps were rubbed and adhered to the back surface of each thermal transfer image-receiving sheet prepared in Examples and Comparative Examples with an index finger. After leaving in a room at 25 ° C. for 5 hours, the part not coated with tap water was held between the thumb and forefinger, the stamp was peeled off from the thermal transfer image-receiving sheet, and evaluated according to the following criteria.
○: At the place where the stamp was peeled off, the back layer of the thermal transfer image-receiving sheet was peeled off together with the back surface intermediate layer, the back side of the base sheet was exposed, and the back layer was peeled off (exposed surface of the base sheet) From the difference in glossiness between the adjacent portions (back layer), it can be clearly determined that the peeling has occurred.
X: At the location where the stamp was peeled off, the stamp was peeled cleanly from the back surface layer, and no traces were left on the back surface layer of the thermal transfer image-receiving sheet.

  In the above evaluation 1, the surface state of the plain paper after the thermal transfer image-receiving sheet was peeled off from the plain paper after the thermal transfer image-receiving sheet was pasted to the object to be pasted, which was plain paper, was evaluated. When the peeled thermal transfer image receiving sheet or another thermal transfer image receiving sheet is attached to the same sticking position again with the same paste as above on the plain paper from which the sheet has been peeled off, in the thermal transfer image receiving sheets of Examples 1 and 2, The adhesiveness was low, and it was clearly understood that it was replaced, and the security was high. In addition, since the base sheet is exposed on the back side of the thermal transfer image receiving sheet peeled off from the plain paper in Examples 1 and 2, the thermal transfer image receiving sheet is replaced with another plain paper with the above glue. As a result, the adhesiveness was low, and it was clearly understood that it was replaced, and the security was high.

  On the other hand, in the thermal transfer image receiving sheet of Comparative Example 1, the peeled thermal transfer image receiving sheet or another thermal transfer image receiving sheet is again pasted with the same paste as described above on the same application position with respect to the plain paper from which the thermal transfer image receiving sheet has been peeled off. When attached, the adhesiveness was high, and it was not known that it was replaced, and the security was low. Further, since the back layer of the back surface of the thermal transfer image receiving sheet peeled off from the plain paper in Comparative Example 1 remains, when the thermal transfer image receiving sheet is pasted on another plain paper with the above glue, adhesion It was highly secure, and it was low security without knowing that it was replaced.

  In the evaluation 2, the surface state of the thermal transfer image receiving sheet was evaluated after the stamp was peeled off from the thermal transfer image receiving sheet after the stamp was applied to the thermal transfer image receiving sheet with water, and the thermal transfer image receiving sheet was further peeled off. On the other hand, when the peeled stamp or another stamp was applied with water again at the same pasting position, the thermal transfer image-receiving sheet of Examples 1 and 2 had low adhesiveness and was clearly replaced. It was easy to understand and secure. Moreover, since the back surface intermediate layer and the back surface layer remain on the back surface of the stamp peeled off from the thermal transfer image receiving sheet in Examples 1 and 2, water was applied and the material was again pasted to another object. However, the adhesiveness was low and abuse could be prevented.

  On the other hand, in the thermal transfer image-receiving sheet of Comparative Example 1, the peeled stamp or another stamp was applied again to the same sticking position with respect to the thermal transfer image-receiving sheet from which the stamp was peeled off. It was high, and it was low security without knowing that it was replaced. In addition, the back side of the stamp peeled off from the thermal transfer image receiving sheet in Comparative Example 1 has nothing transferred from the thermal transfer image receiving sheet, and when water is applied again and is pasted again to another object, adhesion It was highly reliable and could not prevent misuse.

It is a schematic sectional drawing which shows one embodiment of the thermal transfer image receiving sheet of this invention. It is the schematic explaining the state after sticking a stamp with respect to the back surface layer of the thermal transfer image receiving sheet of this invention, and when the stamp was peeled off from the thermal transfer image receiving sheet. FIG. It is the schematic explaining the state after sticking a stamp with respect to the back surface layer of the conventional heat transfer image receiving sheet, and peeling the stamp from a heat transfer image receiving sheet. FIG. 2 is a schematic diagram for explaining a state in which a printed material on which an image is formed on the thermal transfer image-receiving sheet of the present invention is bonded to a resume or the like, and after the printed material is peeled off. It is the schematic explaining the state at the time of attaching the paste to the resume etc. 7 and adhering the printed matter which formed the image in the conventional thermal transfer image receiving sheet, and peeling the printed matter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thermal transfer image receiving sheet 2 Base material sheet 3 Dye receiving layer 4 Back surface intermediate layer 5 Back surface layer 6 Stamp 7 Paste

Claims (2)

  In the thermal transfer image-receiving sheet provided with a dye-receiving layer on one side of the base sheet and a back layer containing a filler on the other side of the base sheet, a back surface intermediate between the base sheet and the back layer A thermal transfer image-receiving sheet provided with a layer, wherein the back surface intermediate layer is made of polyurethane, is not added with an isocyanate compound, and the back surface layer contains polyvinyl butyral and polyvinyl pyrrolidone.   The thermal transfer image-receiving sheet according to claim 1, wherein the back layer further contains a silicone-modified resin.

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