JP2003211857A - Thermal transfer accepting sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal transfer accepting sheet which has excellent feedability in a printer by preventing an accepting surface of the sheet from being fusion bonded to an ink ribbon and preventing a rear surface of the sheet from being fusion bonded to the ink ribbon even when the front and the rear surfaces of the sheet are mistaken to be mounted in the printer and printed and further a dye is not transferred to the rear surface layer of the sheet of the upper surface from the accepting layer even when the printed sheet is superposed. <P>SOLUTION: The thermal transfer accepting sheet comprises a sheet-like support, the accepting layer containing a dye dyable resin as a main ingredient on one side surface of the support, and a rear surface layer on the other surface of the support so that the accepting layer and/or the rear surface layer contains a fluoro-modified silicone resin. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer receiving sheet (hereinafter simply referred to as a receiving sheet) used in a printer which transfers a sublimable dye by heat to form a dyed image.

[0002]

2. Description of the Related Art In recent years, thermal printers, especially thermal transfer printers capable of printing clear full-color images, have received attention. A sublimation thermal transfer printer superimposes a dye transfer medium (ink ribbon) having a dye layer containing a dye that migrates by sublimation or melt diffusion by heat, and the receiving layer surface of a receiving sheet are superposed, and by the heat supplied from a thermal head or the like. An image is formed by transferring a predetermined amount of the dye in a required portion of the ink ribbon dye layer onto the receiving layer of the receiving sheet. Therefore, it is possible to obtain a full-color image excellent in gradation and similar to a photograph.

In order to form a high quality image on a receiving sheet at high speed with such a thermal printer,
A receiving sheet in which a receiving layer containing a dye-dyeing resin as a main component is provided on a sheet-like support is used. Furthermore, on the back surface of this receiving sheet (the surface opposite to the surface provided with the receiving layer),
Generally, a back surface layer is provided for the purpose of improving running properties, preventing static electricity, improving slipperiness between receiving sheets, and the like.

As the dye-dyeable resin for the receiving layer, for example,
When a soft thermoplastic resin having a low glass point transfer (Tg) or a resin having a large number of polar groups is used, the recording density and storability are improved, but the heat applied during recording causes the receiving sheet to form an ink ribbon. However, there was a problem that the transfer abnormalities occurred. In order to prevent such a problem, a method of incorporating a releasing agent into the receiving layer is generally known, and for example, a method of using a silicone type releasing agent (JP-A-60-34898, JP-A-60-34898). 60-21239
No. 4), a method of using a graft copolymer or a block copolymer having a releasing segment such as silicone or a fluorine compound, and the like (JP-A-62-).
222895, JP-A-5-208564,
JP-A-6-127163).

In the above method, if the amount of silicone in the receiving layer is simply increased in order to prevent fusion between the receiving layer of the receiving sheet and the ink ribbon, the adhesiveness between the support and the receiving layer is lowered. Or, there was a tendency for problems such as contamination with silicone to occur. Therefore, when a silicone compound is used as a release agent, a method is used in which silicone and a crosslinking agent are used in combination in a receiving layer coating solution, and then the silicone is crosslinked and cured. However, before the coating, the cross-linking agent and the dyeing resin or reactive silicone may react with each other in the coating liquid, so that the coating liquid may be unstable and deteriorate in quality.

Further, if the front and back surfaces of the receiving sheet are mistakenly attached to the printer and printing is performed, the back surface layer of the receiving sheet fuses with the binder of the ink ribbon, causing a trouble of running the receiving sheet. Therefore, a detection mark that can be read optically or magnetically is provided on the back surface of the receiving sheet, and when the front and back sides of the receiving sheet are reversed, the sensor inside the printer detects the mark and ejects the receiving sheet without printing. As a result, fusion was prevented.
However, the receiving sheet is often used as a single sheet, and if the position of the mark is significantly displaced, it cannot be detected by the sensor. Therefore, the allowable range of mark displacement is 1-2 mm.
Precision is required. Further, a special cutting machine is required to cut the strip-shaped receiving sheet continuously provided with the detection marks so that the marks are in proper positions.

Further, when the receiving sheets are placed one on top of another after printing, the receiving layer surface and the back surface of the overlapping receiving sheets cause a slight fusion and the dye on the receiving layer surface is transferred to the back surface layer. And the density of the printed image is lowered.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional receiving sheet, and fuses the receiving layer surface of the receiving sheet and the ink ribbon during printing,
Alternatively, it prevents fusion between the back surface layer of the receiving sheet and the ink ribbon, and has excellent runnability in the printer. Furthermore, when the printed receiving sheets are stacked, the back surface layer of the receiving sheet from the receiving layer to the upper surface. The present invention is intended to provide a receiving sheet without dye transfer (so-called set-off) to the sheet.

[0009]

The thermal transfer receiving sheet of the present invention comprises a sheet-like support, a receiving layer containing a dye-dyeable resin as a main component on one surface of the support, and the other surface of the support. In the thermal transfer receiving sheet having a back surface layer, the receiving layer and / or the back surface layer contains a fluoro-modified silicone resin. Further, the thermal transfer receiving sheet of the present invention preferably contains the receiving layer and / or the back surface layer obtained by crosslinking the fluoro-modified silicone resin with a crosslinking agent.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a fluoro-modified silicone resin is contained in a receiving layer and / or a back layer of a receiving sheet. For example, when the receiving layer contains a fluoro-modified silicone resin, the receiving layer surface of the receiving sheet and the ink ribbon are not fused during recording of an image.
The receiving layer of the present invention contains a dye-dyeing resin as a main component, a fluoro-modified silicone resin, and preferably a crosslinking agent. The fluoro-modified silicone resin of the present invention is a silicic acid polymer having a silicone resin portion and a fluorine-containing alkyl group portion, exhibits an excellent releasing effect, prevents fusion with an ink ribbon, and produces a clear recorded image. It is obtained, and the image is not contaminated.

Conventionally, generally used reactive silicone compounds have a crosslinkable reactive group such as a hydroxyl group, an amino group, a carboxyl group and an epoxy group, and are usually used after being crosslinked and cured with a crosslinking agent. To be done. The fluoro-modified silicone resin of the present invention preferably has a hydroxyl group,
It has a suitable reactivity to a crosslinking agent such as an isocyanate compound and an epoxy compound. By cross-linking fluoro-modified silicone resin, in printability,
The reason why a further excellent effect is obtained is that unreacted silicone does not remain and a strong 3
It is also conceivable that a silicone layer having a dimensional structure is formed. Specific examples of the fluoro-modified silicone resin used in the present invention include trifluoropropyldimethylsiloxytrimethylsiloxysilicic acid resin (trademark: XS66-).
B8226, manufactured by GE Toshiba Silicone Co., Ltd., and has a hydroxyl group.

In the receiving layer of the present invention, the amount of the fluoro-modified silicone resin used is generally 0.2 to 8% by mass, preferably 0.3 to 8% by weight based on the total solid content of the receiving layer. It is 7% by mass, more preferably 0.5 to 5% by mass. If the blending ratio is less than 0.2% by mass, a sufficient effect of preventing heat fusion cannot be obtained, while if it exceeds 8% by mass, the compatibility of the fluoro-modified silicone resin with the dye-dyeing resin or the cross-linking agent is not achieved. In some cases, the adhesiveness between the coating film for the receptor layer and the support is deteriorated due to the excessively high release performance, and the coating film forming ability is also deteriorated.

In the receiving layer of the present invention, as the dye-dyeing resin, a resin having a good affinity with a dye and a high dyeing property is used. Examples of such resins include polyester resins, polycarbonate resins, vinyl chloride resins, vinyl chloride-vinyl acetate copolymers, polyvinyl acetal resins,
Examples thereof include polyvinyl butyral resins, polystyrene, polyacrylic acid ester resins, cellulose resins such as cellulose acetate butyrate, thermoplastic resins such as polyamide resins, and active energy ray curable resins. It is preferable that these resins have a functional group reactive with the crosslinking agent used, for example, a functional group such as a hydroxyl group, an amino group, a carboxyl group and an epoxy group.

A crosslinking agent is preferably used in the receiving layer of the present invention. As the cross-linking agent, a chemical-reaction-type cross-linking agent that cures or polymerizes by a chemical reaction is preferable. These chemically reactive cross-linking agents include thermosetting types such as epoxy and resole, moisture curing type such as 2-cyanoacrylic acid ester and alkyl titanate, condensation reaction type such as urea, and addition reaction type such as epoxy and isocyanate. A crosslinking agent etc. are mentioned. Among these, as an addition reaction type crosslinking agent,
For example, isocyanate compounds and epoxy compounds are preferably used. The amount of the crosslinking agent blended is preferably about 1 to 30% by mass based on the total solid content of the receptor layer.
If the content ratio of the cross-linking agent is too small, the receiving layer component may not be sufficiently cross-linked, and the receiving layer and the ink ribbon may cause heat fusion during image recording, and if too large, the image density may decrease. .

The isocyanate compound used as the crosslinking agent has two or more isocyanate groups in the molecule,
A polyfunctional polyisocyanate compound containing 3 or 4 is preferable. Examples of the polyfunctional polyisocyanate compound include 2,4-tolylene diisocyanate (2,4-TDI), 2,6-TDI, diphenylmethane-4,4′-diisocyanate (MDI), and hydrogenated M.
DI, 1,5-naphthalene diisocyanate, triphenylmethane triisocyanate, xylylene diisocyanate (XDI), hydrogenated XDI, metaxylylene diisocyanate (MXDI), 3,3′-dimethyl-4,
Aromatic isocyanates such as 4'-diphenylene diisocyanate (TODI), aliphatic isocyanates such as isophorone diisocyanate (IPDI), trimethylhexamethylene diisocyanate (TMDI), hexamethylene diisocyanate (HDI), etc. An adduct that is a reactant,
A biuret body, an isocyanurate body, or an adduct of these polyisocyanates with a polyhydric alcohol such as trimethylolpropane is preferably used.

In the receiving layer of the present invention, if necessary, generally known lubricants, release agents, colored pigments, colored dyes, optical brighteners, plasticizers, Antioxidants, inorganic pigments, UV absorbers and the like can also be added. Benzotriazole-based, benzophenone-based, phenyl salicylate-based, and cyanoacrylate-based compounds are used as the ultraviolet absorber. These various receiving layer addition components may cause a crosslinking reaction via a crosslinking agent. These additives may be applied as a mixture with the main component of the receiving layer, or as a separate coating layer on the receiving layer and / or
Alternatively, it may be coated below.

The solid coating amount of the receiving layer is 1 to 12 g /
It is adjusted to m ² , preferably in the range of 3 to 10 g / m ² . By the way, if the coating amount of the receiving layer is less than 1 g / m ² , the receiving layer cannot completely cover the surface of the support, which leads to deterioration of image quality, and heating of the thermal head causes the receiving layer and the ink sheet to be separated from each other. A fusion problem may occur due to adhesion. On the other hand, when the coating amount exceeds 12 g / m ² , not only is the effect saturated and uneconomical, but also the strength of the receptive layer is insufficient, and the thickness of the receptive layer increases, so that the heat insulating effect of the support is sufficient. The image density may not be exhibited and may be reduced.

In the present invention, the back surface layer of the receiving sheet may contain the same fluoro-modified silicone resin as the receiving layer. By incorporating the fluoro-modified silicone resin in the back surface layer, even if the front and back surfaces of the receiving sheet are mistakenly mounted on the printer and printed, the fusion of the ink ribbon and the back surface layer is prevented. Further, by containing a fluoro-modified silicone resin in the receiving layer and the back surface layer, when printed receiving sheets are stacked, fusion between the receiving layer and the back surface layer of the overlapping receiving sheets is eliminated, and thus the receiving layer of the receiving layer Transfer of dye to the back surface layer (so-called offset) is eliminated.

The back surface layer contains a back surface layer forming resin as a main component, and preferably contains a cross-linking agent similar to the above-mentioned receiving layer. The mixing ratio of the fluoro-modified silicone resin in the total solid content of the back surface layer is usually about 0.2 to 8% by mass, preferably 0.3 to 7% by mass, and more preferably 0.5 to 5% by mass. is there. If the blending ratio is less than 0.2% by mass, a sufficient effect of preventing heat fusion cannot be obtained, and if it exceeds 8% by mass, the compatibility between the back surface layer resin and the conductive agent decreases, and the releasing performance becomes too high. In some cases, the adhesiveness between the back surface layer coating film and the support may be deteriorated due to, and the coating film forming ability may be reduced.

Further, a resin for forming a back surface layer is used for the back surface layer of the present invention, and the adhesion strength between the back surface layer and the support is improved, the print transportability of the receiving sheet, the prevention of scratches on the surface of the receiving layer, and the transfer of dye. It is also effective for prevention. As such a resin, an acrylic resin, an epoxy resin, a polyester resin, a phenol resin, an alkyd resin, a urethane resin, a melamine resin, a polyvinyl acetal resin, or a reaction cured product of these resins can be used.

A conductive agent such as a conductive polymer or a conductive inorganic pigment is preferably added to the back surface layer of the present invention in order to improve print transportability and prevent static electricity. As the conductive polymer, there are cation-based, anion-based, nonionic-based, etc. conductive polymer compounds, and cation-based polymers are generally used. Examples of the cationic polymer include polyethyleneimine, an acrylic polymer containing a cationic monomer, a cation-modified acrylamide polymer, and cationized starch. Generally, the compounding ratio of the antistatic agent is preferably about 7 to 50% by mass based on the total solid content of the back surface layer.

Examples of conductive inorganic pigments include compound semiconductor pigments such as oxides and sulfides disclosed in JP-A-10-67180, and inorganic pigments coated with a compound semiconductor. Examples of compound semiconductors include copper (I) oxide, zinc oxide, zinc sulfide, and silicon carbide. Inorganic pigments coated with a compound semiconductor include titanium oxide coated with semiconductor tin oxide and potassium titanate, and needle-shaped or spherical conductive inorganic pigments are commercially available.

In order to improve the adhesiveness to the sheet-shaped support, the back surface layer of the present invention preferably contains a cross-linking agent such as the above-mentioned polyisocyanate compound or epoxy compound in the back surface layer coating liquid. To use. Generally, the compounding ratio is preferably about 1 to 30% by mass based on the total solid content of the back surface layer.

A friction coefficient adjusting agent such as an organic or inorganic filler may be blended in the back surface layer of the present invention as required. As the organic filler, nylon filler, cellulose filler, urea resin filler, styrene resin filler, acrylic resin filler or the like can be used. As the inorganic filler, silica, barium sulfate, kaolin, clay, talc, heavy calcium carbonate, light calcium carbonate, titanium oxide, zinc oxide and the like can be used. Preferably, an organic filler is used. For example, in the case of a nylon filler, the average particle size is preferably about 1 to 30 μm, and the compounding amount depends on the particle size, but about 2 to 30% by mass based on the total solid content of the back surface layer. Is preferred.

If necessary, conventionally known lubricants, release agents and the like may be used in combination with the back surface layer within the range not impairing the effects of the present invention. Examples of lubricants and release agents that can be used in combination include silicone oils, silicone block copolymers, silicone compounds such as silicone rubber, phosphate ester compounds, fatty acid ester compounds, and fluorine compounds. Further, conventionally known defoaming agents, dispersants,
Colored pigments, fluorescent dyes, fluorescent pigments, ultraviolet absorbers and the like may be appropriately selected and used.

The solid coating amount of the back surface layer is 0.3 to 10 g /
The range of m ² is preferable, and the range of 1 to 8 g / m ² is more preferable. When the coating amount of the back surface layer is less than 0.3 g / m ² , the scratch resistance when the receiving sheet is rubbed is not sufficiently exhibited, and coating defects occur to increase the surface electric resistance value. There are cases. On the other hand, when the coating amount exceeds 10 g / m ² , the effect is saturated and it is uneconomical.

In the receiving sheet of the present invention, if necessary, an intermediate layer may be provided between the sheet-shaped support and the receiving layer in order to impart an antistatic property and a cushioning effect to the receiving layer. Further, the receiving sheet of the present invention may be formed with an image protective layer on the thermal transfer image after printing by the thermal transfer system. The image protective layer is formed by providing an image protective layer for transfer on the ink ribbon and transferring the image protective layer onto the thermal transfer image by heating, or by applying a substantially transparent sheet onto the thermal transfer image. There are wearing methods.

As the support of the receiving sheet of the present invention, high-quality paper, coated paper, paper such as art paper, synthetic paper, plastic films, or a well-known support in which these are appropriately laminated can be used. . The surface layer base material (base material on the side of forming the receiving layer) of the laminated support is not particularly limited, but in view of uniformity of printed image quality and gradation, polyolefin such as polyethylene or polypropylene is used. , Polyester such as polyethylene terephthalate, polyamide,
A stretched film containing a thermoplastic resin such as polyvinyl chloride or polystyrene as a main component can be used. In addition, a synthetic paper obtained by adding an inorganic pigment to the above-mentioned thermoplastic resin and stretched to generate voids, or a single layer or a multi-layer obtained by stretching a resin composition composed of two or more thermoplastic resins to generate voids A foamed stretched film having a structure is also preferably used.

As the core material layer of the laminated support, a sheet having a small heat shrinkability is preferable, and paper containing cellulose pulp as a main component, coated paper, art paper, cast coated paper,
Laminated paper provided with a thermoplastic resin layer on at least one side thereof, or a film or sheet of polyester, polyamide, polyolefin, polystyrene, polycarbonate, polyvinyl alcohol, polyvinyl chloride or the like containing a synthetic resin as a main component is used. As the back surface base material (base material on the side opposite to the surface on which the receiving layer is formed) of the laminated support, a film made of the same material as the surface layer base material is preferably used from the viewpoint of curl prevention and the like.

The laminating method for forming the support is not particularly limited, but known techniques such as wet laminating, extrusion laminating, dry laminating and wax laminating may be used, and generally dry laminating is used. Is used. As the dry laminating adhesive, polyester-based, polyether-based or polyurethane-based adhesives can be used.

The sheet-shaped support of the present invention may have a constitution in which a first base material layer on which a receiving layer is formed, a pressure-sensitive adhesive layer, a release agent layer, and a second base material layer are sequentially laminated. Of course, a support having a sticker or seal type structure can also be used. A back surface layer containing a release agent such as the fluoro-modified silicone resin of the present invention may be further provided on the back surface side of the second base material layer.

The support used in the present invention is 100 to 30.
It preferably has a thickness of 0 μm. Incidentally, if the thickness is less than 100 μm, the mechanical strength is insufficient, and the rigidity and the repulsive force against deformation of the receiving sheet obtained therefrom are insufficient, so that the curling of the receiving sheet generated during printing is sufficient. It may not be possible to prevent it. On the other hand, if the thickness exceeds 300 μm, the thickness of the receiving sheet to be obtained becomes excessively large, which leads to a decrease in the number of sheets of the receiving sheet accommodated in the printer, or conversely, an increase in the volume of the printer, which makes it difficult to make the printer compact. May cause problems such as doing.

Each coating layer in the present invention comprises a bar coater, a gravure coater, a comma coater, a blade coater, an air knife coater, a gate roll coater,
It can be formed by coating and drying using a known coater such as a curtain coater or a die coater.

[0034]

The present invention will be described in detail with reference to the following examples, but the scope of the present invention is not limited thereto.
In the examples, "%" and "parts" represent "mass%" and "parts by mass" unless otherwise specified.

Example 1 "Formation of Support" A biaxially stretched polyethylene terephthalate film having a thickness of 50 μm was used as a core material, a polyolefin was used as a main component on the front and back surfaces, and an inorganic pigment of about 3 was used.
Biaxially stretched void-containing voids containing 0% calcium carbonate, etc. with a thickness of 60 μm, multilayer film (trademark: YUPO FP
G60, manufactured by YUPO Corporation) was laminated and bonded by a dry lamination method using a urethane adhesive to prepare a sheet-shaped support.

[Formation of Receptor Layer and Back Layer] Receptor layer coating liquid-1 having the following composition is coated on the surface of the above-mentioned sheet-like support so that the solid coating amount is 6 g / m ^2. Then, it was dried to form a receiving layer. Next, a back surface layer coating liquid-2 having the following composition is applied to the surface of the above-mentioned sheet-shaped support opposite to the receiving layer coating surface so that the solid content coating amount is 3 g / m ² , and the back surface layer is dried. Was formed. Then, it was cured at 50 ° C. for 48 hours to obtain a receiving sheet.

Receptor Layer Coating Liquid-1 Polyester Resin (Trademark: Byron 200, Toyobo Co., Ltd.) 100 parts Trifluoropropyldimethylsiloxytrimethylsiloxysilicic acid polymer (Trademark: XS66-B8226, GE Toshiba Silicones Co., Ltd.) 2 parts poly Isocyanate (trademark: Takenate D-110N, manufactured by Takeda Pharmaceutical Co., Ltd.) 5 parts Toluene / methyl ethyl ketone = 1/1 (mass ratio) mixed solution 300 parts

Coating liquid for back surface layer-2 Polyvinyl butyral (trademark: BL-S, manufactured by Sekisui Chemical Co., Ltd.) 100 parts Needle-like conductive inorganic pigment (trademark: FT3000, manufactured by Ishihara Sangyo Co., Ltd.) 15 parts Dispersant (trademark: Tenro 70, manufactured by San Nopco) 0.2 parts Nylon filler (trademark: 2000EDX, manufactured by Elofatchem Japan) 5 parts Trifluoropropyldimethylsiloxytrimethylsiloxysilicic acid polymer (trademark: XS66-B8226, manufactured by GE Toshiba Silicones) 2 Parts Polyisocyanate (trademark: Takenate D-110N, manufactured by Takeda Pharmaceutical Co., Ltd.) 5 parts Toluene / methyl ethyl ketone = 1/1 (mass ratio) mixed solution 500 parts

Example 2 In Example 1, the content of trifluoropropyldimethylsiloxytrimethylsiloxysilicic acid polymer in Receptor layer coating liquid-1 was adjusted to 5 parts, and the backside layer coating liquid-2 was trifluoropropyl. Example 1 except that the compounding amount of the dimethylsiloxytrimethylsiloxysilicic acid polymer was 0.7 parts.
A receiving sheet was prepared in the same manner as in.

Example 3 In Example 1, the amount of trifluoropropyldimethylsiloxytrimethylsiloxysilicic acid polymer in Receptor Layer Coating Solution-1 was adjusted to 0.6 part, and the backside coating solution-2 Example 1 except that the blending amount of the fluoropropyldimethylsiloxytrimethylsiloxysilicic acid polymer was 5 parts.
A receiving sheet was prepared in the same manner as in.

Example 4 In the back layer coating liquid-2 of Example 1, a carboxyl-modified silicone oil (trademark: X-22-3715, Shin-Etsu Chemical Co., Ltd.) was used instead of the trifluoropropyldimethylsiloxytrimethylsiloxysilicic acid polymer. A receiving sheet was prepared in the same manner as in Example 1 except that (Production) was used.

Comparative Example 1 Receptor layer coating liquid-1 and back surface layer coating liquid-2 of Example 1
A receiving sheet was prepared in the same manner as in Example 1 except that the trifluoropropyldimethylsiloxytrimethylsiloxysilicic acid polymer was removed.

Comparative Example 2 Receptor layer coating liquid-1 and back surface layer coating liquid-2 of Example 1
In, a receiving sheet was prepared in the same manner as in Example 1 except that dimethyl silicone oil (trade name: SH200, manufactured by Toray Dow Corning) was used in place of the trifluoropropyldimethylsiloxytrimethylsiloxysilicic acid polymer.

Comparative Example 3 Receptor layer coating liquid-1 and back surface layer coating liquid-2 of Example 1
A receiving sheet was prepared in the same manner as in Example 1, except that a fluorosurfactant (trademark: Fluorard FC431, manufactured by 3M) was used in place of the trifluoropropyldimethylsiloxytrimethylsiloxysilicic acid polymer.

Evaluation Using the receiving sheet obtained in each of the above Examples and Comparative Examples, printability, adhesiveness between the receiving layer and the support, backside printability, adhesiveness between the backside layer and the support, Each of the items and the set-off property were evaluated by the methods described below, and the results are summarized in Table 1.

"Printability" Using a sublimation color video printer (trademark: UP5500, manufactured by Sony Corporation)
200 solid black images were continuously printed on the receiving layer surface of the receiving sheet. At that time, the running property and printability of the receiving sheet were judged according to the following evaluation criteria. ⊚: All sheets can be printed without any problems, with no paper feeding or paper ejection errors. ◯: One or two sheet feeding and discharging errors occur, but are at a practical level. Δ: 3 to 5 sheet feeding and discharging errors occur, which is a practical problem level. Poor: Practical use is not possible because there is frequent fusion between the receiving layer surface of the receiving sheet and the ink ribbon, causing jamming or ribbon breakage inside the printer.

"Adhesiveness between Receptor Layer and Support" An adhesive tape (trademark: Cellotape (registered trademark), manufactured by Nichiban Co., Ltd.) is manually attached to the receptor layer surface of the receptor sheet, and then peeled off to remove the receptor layer. The degree of peeling was visually evaluated according to the following criteria. ◯: Adhesion is good without peeling of the receiving layer. (Triangle | delta): A receiving layer adheres to a part of adhesive tape and peels off, and it becomes a problem in practice. X: The receiving layer adheres to the entire surface of the adhesive tape and peels off, resulting in poor adhesion.

"Backside printability" A sublimation color video printer (trade name: UP5500, manufactured by Sony Corporation) is used so that the backside layer of the receiving sheet is printed, that is, the front and back sides of the receiving sheet are reversed. A receiving sheet was attached and a black solid pattern was printed. At that time, the state of fusion of the ink ribbon and the back surface layer, and the transportability of the receiving sheet,
The runnability was judged according to the following evaluation criteria. ⊚: There is no fusion between the ink ribbon and the back surface layer, and both print transportability and runnability are excellent. ◯: The ink ribbon and the back surface layer are slightly fused to each other, but the print transportability and the running property are good, and the sheet is discharged without any problem. X: The ink ribbon and the back surface layer are fused and problems such as jamming and ribbon breakage occur in the printer, which is a problem in practical use.

"Adhesiveness between Backside Layer and Support" Adhesive tape (trademark: Cellotape (registered trademark), manufactured by Nichiban Co., Ltd.) was manually attached to the backside layer surface of the receiving sheet and then peeled off to remove the backside layer. The degree of peeling was visually evaluated according to the following criteria. ◯: Adhesion is good without peeling of the back surface layer. (Triangle | delta): A back surface layer adheres to a part of adhesive tape and peels off, and becomes a problem in practice. X: The back surface layer adhered to the entire surface of the adhesive tape and was peeled off, which was not practical.

"Set-off property" A sublimation color video printer (trademark: UP5500, manufactured by Sony Corporation) is used, a receiving sheet is attached so that the receiving layer surface of the receiving sheet is printed, and a black solid image is printed on the receiving layer surface. did. The printed sample is overlaid to bring the printed receptive layer surface and the unprinted back surface layer into contact with each other, and to give 200 g / cm ²
The sample was heated at 60 ° C. for 24 hours under the pressure. After heating, the (black) optical density of the backside layer in contact with the printed receptor layer was measured using a Macbeth densitometer (trademark: RD-914). The optical density of (black) of the back surface layer before the set-off test was 0.05. <Evaluation Criteria> A: The optical density of (black) in the back surface layer is less than 0.10, and almost no set-off is observed. ◯: The optical density of the back layer (black) is 0.10 to 0.14
Then, it is a practical range though it slightly offsets. X: The optical density of (black) of the back surface layer is 0.15 or more, and the set-off is remarkable.

[0051]

[Table 1]

As is clear from the results shown in Table 1, Example 1
3 to 3, the receiving sheet obtained by adding a certain amount of the fluoro-modified silicone resin to the receiving layer and the back surface layer has excellent printability of the receiving layer and the back surface layer, adhesiveness with a support, and transferability. It turns out that it has excellent performance. Further, from Example 4, it is also possible to use a fluoro-modified silicone resin only in the receiving layer and appropriately use a conventional silicone oil or the like in the back surface layer. On the other hand, when the receiving layer and the back surface layer do not contain a fluoro-modified silicone resin (Comparative Example 1), the printability of the receiving layer and the back surface layer is poor, and when dimethyl silicone oil is used (Comparative Example 2), The adhesiveness and set-off property of the receiving layer and the backside layer to the support are poor, and the printability of the receiving layer is insufficient. Further, when a fluorine-based surfactant is used (Comparative Example 3), the printability of the receiving layer surface is insufficient and the set-off property is poor.

[0053]

The effect of the invention is to prevent fusion of the receiving layer surface of the receiving sheet and the ink ribbon at the time of printing, and even when the front and back surfaces of the receiving sheet are mounted on the printer by mistake and printing is performed, the back surface layer of the receiving sheet and the ink. Prevents fusion with the ribbon and provides a receiving sheet with excellent printability and runnability.
When the printed receiving sheets are placed one on top of the other, it is possible to obtain a receiving sheet without dye transfer from the receiving layer to the back surface layer of the upper receiving sheet, which greatly contributes to the industry.

Claims (2)

[Claims] 1. A thermal transfer receiving sheet comprising a sheet-like support, a receiving layer containing a dye-dyeing resin as a main component on one surface of the support, and a back surface layer on the other surface of the support,
The thermal transfer receiving sheet, wherein the receiving layer and / or the back surface layer contains a fluoro-modified silicone resin. 2. The thermal transfer receiving sheet according to claim 1, wherein the fluoro-modified silicone resin is crosslinked with a crosslinking agent in the receiving layer and / or the backside layer.