JPH07101163A - Thermal transfer image receiving sheet - Google Patents

Abstract

(57) [Summary] [Purpose] Regarding a thermal transfer image-receiving sheet for sublimation type thermal transfer recording, it has excellent paper feeding / discharging characteristics in a printer, and even when the printed image and the back surface are stacked and stored, dye transfer does not occur. Provided is a thermal transfer image-receiving sheet excellent in usability. [Structure] In a thermal transfer image-receiving sheet in which a dye receiving layer 2 is provided on one surface of a substrate sheet 1 and a slippery back surface layer 3 is provided on the other surface, a main component of the slippery back surface layer 3 is a fixing agent. And made of nylon filler. The fixing agent is non-dyeing to a sublimable dye, and the nylon filler is preferably nylon 12 having a molecular weight of 100,000 to 900,000 and an average particle diameter of 0.01 to 30 μm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image receiving sheet for thermal transfer recording, and more particularly to a thermal transfer image receiving sheet used for sublimation type thermal transfer recording.

[0002]

2. Description of the Related Art Heretofore, various thermal transfer methods have been known. Among them, a sublimation dye is used as a recording material, which is carried on a base material such as paper or a plastic film to form a thermal transfer sheet. A method of obtaining a recorded image by superimposing it on a thermal transfer image-receiving sheet having a receiving layer capable of being dyed with a sublimable dye and transferring the dye to the image-receiving sheet by heating with a thermal head according to a recording signal has been attracting attention. In this recording method, the heating means is a thermal head of a printer, and a full-color image of an original is reproduced by a large number of dots of three or four colors by heating for an extremely short time. And since the coloring material used is a dye, it is very clear,
In addition, because the transparency is excellent, the obtained image has excellent reproducibility of intermediate colors and gradation, and is similar to the image by conventional full-color offset printing or gravure printing, and a high-quality image comparable to a photographic image is formed. It is possible.

The thermal transfer image receiving sheet used in such a sublimation type thermal transfer recording system is applied to an opaque base sheet such as paper or synthetic paper when a reflection image is required as in general printed matter or photographs. A dye-receptive layer is used. On the other hand, when a transmissive image such as used in OHP is required, a transparent substrate sheet such as a polyester film is provided with a dye-receptive layer. Are using.

[0004]

When an image is recorded using these thermal transfer image-receiving sheets, the temperature inside the printer as a whole rises, and as a result, slipperiness and blocking resistance are lowered, and paper jams and paper jams occur. There is a problem such as multiple feeding, and low friction is required between the image receiving surface and the back surface of the image receiving sheet, and high friction between the paper feed rubber roll of the printer and the back surface of the image receiving sheet. While the property is required, there is a problem that the property is likely to be deviated.
Further, these thermal transfer image-receiving sheets also have a problem that the back surface is contaminated by dyes when the printed screen and the back surface are overlapped and stored, and improvement thereof is desired.

Conventionally, as a countermeasure against these, a filler such as talc, clay, silica, Teflon powder, etc., which is considered to be thermally stable and has low dye-dyeability, is added to the back layer of the thermal transfer image-receiving sheet as a lubricant. There is. However, inorganic fillers such as silica and clay have the problem of damaging the paper feed rubber roller of the printer, and those that show low friction due to self-destruction, such as talc and Teflon powder, have abrasion powder. There is a problem that it is transferred to a rubber roller or the like and the friction characteristics after that are different. The present invention solves these problems, and provides a thermal transfer image-receiving sheet which is excellent in paper feeding / discharging characteristics, and has excellent suitability for use, in which there is no set-off of dye when the printed image and the back surface are overlapped and stored. The purpose is to

[0006]

Means for Solving the Problems As a result of intensive research to solve the above problems, the following objects of the present invention have been achieved. That is, the invention of claim 1 is a thermal transfer image-receiving sheet comprising a substrate sheet having a dye receiving layer on one surface thereof and the other surface having a slippery back surface layer, wherein the main component of the slippery back surface layer is the main component. Is a thermal transfer image-receiving sheet characterized by being a fixing agent and a nylon filler.

The invention according to claim 2 is the thermal transfer image-receiving sheet according to claim 1, wherein the nylon filler is a nylon 12 filler. The invention of claim 3 is the thermal transfer image-receiving sheet according to claim 1, wherein the nylon filler has a spherical shape and a molecular weight of 100,000 to 900,000. .

The invention according to claim 4 is the thermal transfer image-receiving sheet according to any one of claims 1, 2, and 3, wherein the nylon filler has an average particle diameter of 0.01 to 30 µm. The invention according to claim 5 is the thermal transfer image-receiving sheet according to claim 1, wherein the fixing agent is a resin that is non-dyeing to a sublimation dye.

(Preferred Embodiment) Next, a preferred embodiment of the present invention will be described in more detail with reference to the drawings. Figure 1
FIG. 3 is a schematic sectional view showing an example of the thermal transfer image-receiving sheet of the present invention. This thermal transfer image-receiving sheet is a thermal transfer image-receiving sheet in which a dye receiving layer 2 is provided on one surface of a base material sheet 1 and a slippery back surface layer 3 is provided on the other surface. Is composed of a fixing agent and a nylon filler.

The constituent materials of each layer of the thermal transfer image-receiving sheet of the present invention will be described below. 1) Base Material Sheet In the present invention, as the material that can be used for the base material sheet, various types of papers such as simple papers or processed papers can be used. For example, high-quality paper, coated paper, art paper, cast coated paper, In addition to paperboard and the like, examples include impregnated papers such as resin emulsion and synthetic rubber latex, and synthetic resin internal addition papers, and laminated papers of these and various plastic films can also be used.

As the synthetic paper, polystyrene-based synthetic paper, polyolefin-based synthetic paper and the like can be favorably used, and as the plastic film, the polyolefin-based resin film,
Polyvinyl chloride film, polyester resin film, polystyrene film, polycarbonate film, polyacrylonitrile film, polymethacrylate film and the like can be used. As these plastic films, not only a transparent film but also a white opaque film formed by adding a white pigment, a filler, or the like, or a foamed film can be used, and there is no particular limitation.

When a plastic film is used, a plasticizer or the like may be added if necessary in order to adjust the rigidity of the film. Each of these materials can be used alone, or may be used as a laminated body in combination with another material, as touched with paper. Also,
When forming the dye receiving layer or the slippery back surface layer on these substrate sheets, corona discharge treatment, primer coating, or provision of an intermediate layer is optional. The thickness of this substrate sheet is generally 10 μm to 400 μm.
The range is about 100 μm to 300 μm. A transparent polyethylene terephthalate sheet having a thickness of about 50 to 200 μm is suitable for applications requiring a translucent image such as OHP.

2) Dye Receiving Layer In the thermal transfer image-receiving sheet of the present invention, the dye receiving layer may be any known dye receiving layer used in the sublimation type thermal transfer system and is not particularly limited. Is mentioned. (A) Resin having ester bond: polyester resin, polyacrylic ester resin, polycarbonate resin, polyvinyl acetate resin, styrene acrylate resin, vinyl toluene acrylate resin, etc.

(B) Resin having urethane bond Polyurethane resin and the like. (C) Resin having amide bond Polyamide resin and the like. (D) Resin having urea bond Urea resin and the like. (E) Other resins having a highly polar bond Polycaprolactone resin, styrene-maleic anhydride resin, polyvinyl chloride resin, polyacrylonitrile resin, etc. In addition to the above synthetic resins, mixtures or copolymers of these can also be used.

Since the dye receiving layer is heat-pressed together with the thermal transfer sheet by a thermal head or the like at the time of transfer, it easily sticks to the surface of the thermal transfer sheet and is usually dye-permeable to the above resins. It is formed by containing a release agent. As such a release agent, solid waxes, fluorine-based or phosphoric acid ester-based surfactants, silicone oils and the like are used. In particular, as the silicone oils, oily ones can be used, but reaction-curable ones are preferable, and, for example, a combination of amino-modified silicone and epoxy-modified silicone is preferable.

In the case of a solid wax, the amount of these releasing agents added is 5 to 50% by weight, preferably 10 to 20% by weight, based on the weight of the resin. In the case of agents, 0.5 to 10 of resin weight
% By weight. Further, in the case of curable silicone oils, since they are not sticky, they can be used in a large amount and can be added within the range of 0.5 to 30% by weight of the resin weight. In either case, if the amount is too small, the releasing effect becomes insufficient, and if the amount is too large, the receptivity of the dye is lowered and sufficient recording density cannot be obtained.

As a method for imparting a releasing property to the dye receiving layer, a releasing layer is separately laminated on the dye receiving layer in addition to the method of incorporating a releasing agent into the dye receiving layer as described above. It is also possible to use any method. Further, the dye receiving layer may optionally contain finely powdered silica, an inorganic filler such as titanium oxide, an antioxidant, an ultraviolet absorber or the like.

The method for forming the dye receiving layer on the substrate sheet is, for example, a method in which these materials are dissolved in an organic solvent, or a liquid obtained by dispersing the materials in an organic solvent or water is gravure printing method, screen printing method, gravure method. It can be formed by coating and drying by a reverse roll coating method using a plate, a die coating method or the like. Further, depending on the type of material, it is also possible to form it by a melt extrusion coating method without using an organic solvent or water. The dye-receptive layer formed as described above may have any thickness, but generally has a thickness of 1 to 50 μm.

3) Sliding back surface layer The thermal transfer image receiving sheet of the present invention is mainly characterized by this sliding back surface layer, and when curling of the image receiving sheet due to heat of the thermal head at the time of thermal transfer is prevented, and the layers are stacked. To improve the blocking resistance and slipperiness of
When the print screen and the back surface are overlapped and stored, the back surface is prevented from being contaminated due to migration of the dye in the print screen. For this reason, the main component of the slippery back surface layer is formed by using a resin having a low dye-dyeability as a fixing agent and containing a nylon filler therein.

As such a fixing agent, that is, a resin having a low dye-dyeability, specifically, an acrylic resin, a polystyrene resin, a polyolefin resin, a polyamide resin, polyvinyl butyral, polyvinyl alcohol, a cellulose acetate resin. And so on. In addition, a curable resin obtained by curing polyvinyl butyral, melamine, cellulose, an acrylic resin or the like by a means such as chelate, isocyanate or radiation irradiation is also preferable. The above is merely an example, and the present invention is not limited to this, and various resins can be used as long as they have low dye-dyeability, and two or more kinds of resins can be mixed and used.

The nylon filler has a molecular weight of 10
10,000 to 900,000, spherical, with an average particle diameter of 0.01 to 3
It is preferably 0 μm, and particularly has a molecular weight of 100,000 to 50.
However, those having an average particle diameter of 0.01 to 10 μm are more preferable. Further, as the type of nylon filler, nylon 12 filler is more preferable than nylon 6 and nylon 66 because it has excellent water resistance and does not change in characteristics due to water absorption.

Nylon fillers have a high melting point, are thermally stable, and have good oil resistance and chemical resistance, so that they are not easily dyed with dyes. Further, it has self-lubricating properties, has a low coefficient of friction, and when the molecular weight is 100,000 to 900,000, it is hardly worn and the mating material is not damaged. Further, the preferable average particle diameter is 0.1 to 30 μm in the case of a thermal transfer image receiving sheet for reflective images, and 0.01 to 1 μm in the case of a thermal transfer image receiving sheet for transmission images. If the particle diameter is too small, the filler is hidden in the slippery back surface layer and does not perform the function of sufficient slipperiness, and if the particle size is too large, the protrusion from the slippery back surface layer becomes large, resulting It is not preferable because the friction coefficient is increased and the filler is lost.

The blending ratio of the nylon filler to the fixing agent is preferably in the range of 0.01 to 200% by weight. In the case of a thermal transfer image-receiving sheet for reflection images, 1 to 100% by weight is more preferable, and in the case of a thermal transfer image-receiving sheet for transmission images,
0.05 to 2% by weight is more preferable. When the blending ratio of the nylon filler is 0.01% by weight or less, the slipperiness is insufficient, which causes problems such as paper jam. Also, 200
When the content is more than 5% by weight, it is not preferable because it slips too much and causes troubles such as color shift on the printed screen.

The method for forming the slippery back surface layer is usually one in which a nylon resin is added to the adhesive resin in the above-mentioned appropriate range and, if necessary, necessary additives are added and dissolved in an organic solvent. Alternatively, it is dispersed in an organic solvent or water to prepare a coating solution, which is applied 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, and dried to form the coating solution. Further, in some cases, it may be formed by a melt extrusion coating method without using a solvent or a dispersion medium. The thickness of the slippery back surface layer to be formed is generally about 1 to 70 μm.

When performing thermal transfer using the thermal transfer image-receiving sheet of the present invention as described above, the thermal transfer sheet to be used is, for example, a paper or polyester film provided with a dye transfer layer containing a sublimable dye, and the back surface thereof. Is provided with a heat resistant layer as required, and any conventionally known thermal transfer sheet can be used as it is in the present invention. Also,
Regarding the apparatus used for thermal transfer, any conventionally known apparatus can be used. For example, by controlling the recording time with a recording apparatus such as a thermal printer (for example, a video printer VY-100 manufactured by Hitachi Ltd.), The object can be sufficiently achieved by applying a thermal energy of about 100 mJ / mm ² .

[0026]

The thermal transfer image-receiving sheet according to the present invention is a thermal transfer image-receiving sheet comprising a base material sheet having a dye receiving layer on one surface thereof and a slippery back surface layer on the other surface thereof. The main component of the back surface layer is composed of a fixing agent and a nylon filler. By adopting such a configuration,
The surface of the slippery back surface layer of the image-receiving sheet has fine irregularities, and the slipperiness and blocking resistance are improved, and troubles such as multiple insertion in a printer and other conveyance such as automatic paper feeding and discharging can be eliminated. Also, nylon filler is
It has a high melting point, self-lubricating property, and excellent oil resistance and chemical resistance, so even if the temperature of the image receiving sheet rises in the printer, stable performance can be obtained without lowering slipperiness and blocking resistance. Even if the printed image and the back surface of the image receiving sheet are superposed and stored, the back surface is hardly contaminated by the sublimable dye.

The thermal transfer image-receiving sheet according to the present invention of claim 2 is
In the thermal transfer image-receiving sheet according to the first aspect of the present invention, the nylon filler added to the back surface layer is nylon 12 filler. With this configuration, the water resistance of the nylon 12 filler is superior to that of, for example, nylon 6 or 66, so that it is difficult to absorb water, and the above-described action can be stably obtained even under high humidity conditions. .

The thermal transfer image-receiving sheet of the invention of claim 3 is the thermal transfer image-receiving sheet of the invention of claims 1 and 2, wherein the nylon filler has a spherical shape and a molecular weight of 100,000 to 100. It is made up of those that fall in the range of 900,000. By adopting such a configuration,
In each of the operations of claims 1 and 2, the blocking resistance and slipperiness of the back surface of the image receiving sheet are further improved, and further, since the filler is excellent in abrasion resistance, abrasion powder may be transferred to a rubber roller or the like. In addition, the safety is further improved because there is no damage to the rubber roller or other mating material.

The thermal transfer image-receiving sheet according to the invention of claim 4 is
In the thermal transfer image-receiving sheet of the present invention of claims 1, 2, and 3, the nylon filler has an average particle size of 0.01 to 3
It is configured to be in the range of 0 μm. By adopting such a configuration, the nylon filler will not be buried in the back surface layer, and it will not protrude too much from the back surface layer to increase the coefficient of friction or fall off,
The effects of each of claims 1, 2 and 3 can be stably obtained at an effective level.

The thermal transfer image-receiving sheet according to the invention of claim 5 is
In the thermal transfer image-receiving sheet of the present invention according to claims 1, 2, 3, and 4, the adhesive agent of the slippery back surface layer is composed of a non-dyeing resin to a sublimable dye. By adopting such a structure, the stain resistance of the back surface layer due to the sublimable dye is further improved, and even if the printed image and the back surface of the image-receiving sheet are superposed and stored, the back surface is not contaminated by the sublimable dye. .

[0031]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples. (Example 1) As a base sheet, synthetic paper YUPO FPG # 150 (manufactured by Oji Yuka Synthetic Paper) having a thickness of 150 μm was used.
A coating solution for a dye receiving layer having the following composition was applied on one surface thereof with a bar coater to a coating amount of 5.0 g / m ² (solid content) and dried, and then on the other surface, the following composition was applied. 1. The coating solution for the primer layer and the coating solution for the slippery back surface of No. 1 were sequentially applied at 0.2 g / m ² (solid content) and 1.
A thermal transfer image-receiving sheet of Example 1 was prepared by coating with a bar coater so as to obtain 0 g / m ² (solid content) and drying.

Composition of coating liquid for dye receiving layer Polyester resin [Vylon 600 manufactured by Toyobo Co., Ltd.] 40 parts by weight Vinyl chloride-vinyl acetate copolymer [# 1000A manufactured by Denki Kagaku Co., Ltd.] 60 parts by weight Addition polymerization Type silicone [X-62-1212 manufactured by Shin-Etsu Chemical Co., Ltd.] 10 parts by weight Catalyst [PL50T manufactured by Shin-Etsu Chemical Co., Ltd.] 5 parts by weight Solvent (methyl ethyl ketone / toluene weight ratio 1: 1) 885 parts by weight or less, methyl ethyl ketone Is displayed as MEK.

Composition of coating liquid for primer layer Urethane resin [Nipporan 5199 Nippon Polyurethane Industry Co., Ltd.] 25 parts by weight Solvent (isopropyl alcohol / toluene / MEK) 75 parts by weight (weight ratio 1: 2: 2) Alcohol is labeled IPA.

Composition of coating liquid for slippery back surface layer Acrylic resin [BR85 manufactured by Mitsubishi Rayon Co., Ltd.] 10 parts by weight Nylon 12 filler [MW330 manufactured by Shinto Paint Co., Ltd.] 2 parts by weight Solvent (MEK / toluene weight ratio 1 1) 88 parts by weight

(Example 2) In the constitution of Example 1, only the coating solution for the slippery back surface layer was changed to the coating solution having the following composition, and otherwise the processing was carried out in the same manner as in Example 1 to carry out the thermal transfer image-receiving sheet of Example 2. Got Composition of coating liquid for slippery back surface layer Acrylic resin [BR80 manufactured by Mitsubishi Rayon Co., Ltd.] 10 parts by weight Nylon 12 filler [MW330 Shinto Paint Co., Ltd.] 2 parts by weight Solvent (MEK / toluene weight ratio 1: 1) 88 parts by weight

(Example 3) In the constitution of Example 1, only the coating solution for the slippery back surface layer was changed to a coating solution having the following composition, and otherwise the same processing as in Example 1 was carried out, and the thermal transfer image-receiving sheet of Example 3 was obtained. Got Composition of coating liquid for slippery back surface layer Acrylic resin [BR113 Mitsubishi Rayon Co., Ltd.] 10 parts by weight Nylon 12 filler [MW330 Shinto Paint Co., Ltd.] 2 parts by weight Solvent (MEK / toluene weight ratio 1: 1) 88 parts by weight

(Example 4) In the configuration of Example 1, the coating liquid for the primer layer and the coating liquid for the slippery back surface layer were replaced with the coating liquid of the following composition, and otherwise the same processing as in Example 1 was carried out. Thus, a thermal transfer image-receiving sheet of Example 4 was obtained. Composition of coating liquid for primer layer Polyolefin resin [UNISTOL R300 Mitsui Petrochemical Co., Ltd.] 35 parts by weight Solvent (toluene) 65 parts by weight Composition of coating liquid for slippery back surface layer Amorphous polyolefin resin [ZEONEX 480 Nippon ZEON Co., Ltd.] 10 parts by weight Nylon 12 filler [MW330 Shinto Paint Co., Ltd.] 2 parts by weight Solvent (toluene) 88 parts by weight

(Example 5) In the structure of Example 1, the coating of the primer layer was omitted, the coating solution for the slippery back surface layer was changed to the following composition, and the other processing was performed in the same manner as in Example 1 A thermal transfer image-receiving sheet of Example 5 was prepared. Composition of coating liquid for slippery back surface layer Polyvinyl butyral resin [3000-1 manufactured by Denki Kagaku Kogyo KK] 10.0 parts by weight Chelating agent [Tencalate TP110] 4.3 parts by weight Nylon 12 filler [MW330 Shinto Paint Co., Ltd. )] 2 parts by weight solvent (MEK / toluene weight ratio 1: 1) 83.7 parts by weight

(Example 6) In the structure of Example 1, the coating of the primer layer was omitted, the coating solution for the slippery back surface layer was changed to the following composition, and the other processing was carried out in the same manner as in Example 1. A thermal transfer image-receiving sheet of Example 6 was prepared. Composition of coating liquid for slippery back surface layer Melamine resin [Cymel 303 manufactured by Mitsui Siamid Co., Ltd.] 10 parts by weight Catalyst [Catalyst 6000 manufactured by Mitsui Toatsu Chemicals, Inc.] 5 parts by weight Nylon 12 filler [MW330 Shinto paint Co., Ltd.] 2 parts by weight Solvent (MEK / toluene weight ratio 1: 1) 83 parts by weight

(Example 7) In the configuration of Example 1, only the nylon 12 filler added to the coating solution for the slippery back surface layer was changed to nylon 6 filler, and otherwise the same processing as in Example 1 was carried out. A thermal transfer image receiving sheet of No. 7 was prepared.

Next, the structure of the thermal transfer image-receiving sheet of the comparative example will be described. In the comparative example, in the constitution of Example 1, the kind of the filler added to the slippery back surface layer, that is, only the nylon 12 filler was replaced with the following fillers to prepare a coating solution for the slippery back surface layer, and Are all processed in the same manner as in Example 1 to prepare image receiving sheets of Comparative Examples 1 to 7.

(Comparative Example 1) A thermal transfer image-receiving sheet prepared by replacing with polyethylene wax (particle size: 10 μm). (Comparative Example 2) A thermal transfer image-receiving sheet prepared by replacing Teflon powder (particle size: 0.5 μm). (Comparative Example 3) A thermal transfer image-receiving sheet prepared by replacing talc (particle size 1.8 μm). (Comparative Example 4) A thermal transfer image-receiving sheet prepared by replacing clay (particle size: 0.4 μm). (Comparative Example 5) A thermal transfer image-receiving sheet prepared by replacing acrylic beads (particle size: 10 μm). (Comparative Example 6) A thermal transfer image-receiving sheet prepared by replacing ethylene bisamide. (Comparative Example 7) A thermal transfer image-receiving sheet prepared by replacing with silicone powder (particle size: 1.5 μm).

(Tests and Results) The thermal transfer image-receiving sheets of Examples 1 to 7 and Comparative Examples 1 to 7 prepared as described above were tested for the following items, and the results are shown in Tables 1 and 2. Indicated.

1) Coefficient of friction between image receiving surface and back surface of image receiving sheet
(Sliding property) A coefficient of friction between the image receiving surface and the back surface was measured by a method shown in FIG. 2 by a tensile strength tester (Tensilon UCT100 manufactured by Orientec Co., Ltd.). Friction coefficient is measured value (g)
Was divided by the weight load of 2000 g.

2) Paper supply / discharge of the back side of the image receiving sheet and the printer
Coefficient of friction with rubber roll for use With a measuring device as shown in FIG. 3, the rubber roll was rotated at a surface speed of 6 cm / sec with a load of 300 g, and the scale (g) of the spring balance was read 15 seconds after the start, and this value was read. It was divided by the load to obtain the coefficient of friction on the back surface.

3) Dye-proof transferability on the back surface of the image receiving sheet A thermal sublimation transfer printer (VY-
50 Hitachi, Ltd.), and a gradation pattern was printed using a transfer sheet using a cyan dye. Using this as a sample, cut it to a size of 14 x 4 cm, stack the printed screen and the back surface, and sandwich them with a smooth metal plate.
It was left to stand in an oven at 50 ° C. for 7 days under a load of g. Then, the sample was taken out and the maximum color density on the back surface was measured by a Macbeth color densitometer. (Below margin)

[0047]

[Table 1]

[0048]

[Table 2] (Note) * 1: Stick-slip phenomenon (slip phenomenon with catching) * 2: Rubber powder adheres to the back surface of the image receiving sheet * 3: Silicone powder adheres to the rubber roll

(Evaluation of Measured Values) 1) The coefficient of friction between the image receiving surface and the back surface of the image receiving sheet is preferably low. 2) The coefficient of friction between the back surface of the image receiving sheet and the rubber roll for paper feeding and discharging of the printer is preferably high. 3) The lower the value of dye transfer resistance on the back surface of the image receiving sheet, the better.

In addition to the above test, in order to check the paper feeding / discharging and transport characteristics of the image receiving sheet in a printer under a high temperature and high humidity environment, Example 1 (using nylon 12 filler) and Example 7 were examined. A sample of (using nylon 6 filler) was subjected to a printing test on 50 sheets continuously in an environment of 35 ° C. and 80% RH with a thermal sublimation transfer printer (VY-50). As a result, the image receiving sheet of Example 1 has no defect.
On the other hand, the image receiving sheet of Example 7 had two sheet feeding defects. This shows that the nylon 12 filler can maintain its effect even in an environment of high temperature and high humidity.

[0051]

The thermal transfer image-receiving sheet of the invention of claim 1 is a thermal transfer image-receiving sheet comprising a base material sheet having a dye receiving layer on one surface thereof and a slippery back surface layer on the other surface thereof. The main component of the slippery back surface layer is composed of a fixing agent and a nylon filler. By adopting such a configuration, the surface of the slippery back surface layer of the image receiving sheet has a fine uneven shape, and the slipperiness and blocking resistance are improved. In addition, nylon filler has a high melting point, self-lubricating property, and excellent oil resistance and chemical resistance, so it is possible to solve problems such as multiple insertion in the printer and other transporting problems such as automatic paper feeding and discharging. Even when the temperature of the image-receiving sheet rises, stable performance is obtained without lowering the slipperiness and blocking resistance, and even when the image-receiving sheet's print screen and back surface are stacked and stored, the back surface of the sublimable dye It is possible to provide a thermal transfer image-receiving sheet having an excellent performance of preventing set-off to

The thermal transfer image-receiving sheet according to the invention of claim 2 is
In the thermal transfer image-receiving sheet according to the first aspect of the present invention, the nylon filler added to the back surface layer is nylon 12 filler. Nylon 12 filler has better water resistance than other nylon fillers such as Nylon 6 and 66, so it is difficult to absorb water, and its characteristics do not change even under conditions of high temperature and high humidity, and the above-mentioned performance is maintained. The effect is obtained stably.

The heat transfer image-receiving sheet of the present invention of claim 3 is the same as the heat transfer image-receiving sheet of the inventions of claims 1 and 2, wherein the nylon filler is spherical and has a molecular weight of 100,000 to 900,000. The range is. By adopting such a configuration, the sliding property of the back surface of the image receiving sheet, the blocking resistance is further improved, and since the wear resistance of the filler is improved, the abrasion powder does not adhere to the rubber roller or the like, It also has the effect of not damaging the rubber roller or other mating material.

The thermal transfer image-receiving sheet according to the invention of claim 4 is
In the thermal transfer image-receiving sheet of the present invention of claims 1, 2, and 3, the nylon filler has an average particle size of 0.01 to 3
It is configured to be in the range of 0 μm. By adopting such a configuration, the nylon filler will not be buried in the back surface layer, and it will not protrude too much from the back surface layer to increase the coefficient of friction or fall off,
The effects of each of claims 1, 2 and 3 can be obtained effectively and stably.

The thermal transfer image-receiving sheet of the present invention according to claim 5 is
In the thermal transfer image-receiving sheet of the present invention according to claims 1, 2, 3, and 4, the adhesive agent of the slippery back surface layer is composed of a non-dyeing resin to a sublimable dye. By adopting such a configuration, the stain resistance of the sublimable dye is further improved in combination with the uneven shape of the back surface layer, and even if the printed image and the back surface of the image receiving sheet are superposed and stored, the sublimable dye There is an effect that the set-off due to is almost eliminated.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of a thermal transfer image-receiving sheet of the present invention.

FIG. 2 is a schematic diagram of a main part showing a method for measuring a coefficient of friction between an image receiving surface and a back surface of a thermal transfer image receiving sheet.

FIG. 3 is a schematic view showing a method of measuring a friction coefficient between a back surface of a thermal transfer image receiving sheet and a rubber roll for paper feeding and discharging of a printer.

[Explanation of symbols]

 1 Base Material Sheet 2 Dye Receiving Layer 3 Sliding Back Layer

Claims (5)

[Claims] 1. A thermal transfer image-receiving sheet comprising a base sheet and a dye receiving layer on one surface thereof, and a slippery back surface layer on the other surface thereof, wherein the main components of the slippery back surface layer are a fixing agent. A thermal transfer image-receiving sheet characterized by being a nylon filler. 2. The thermal transfer image-receiving sheet according to claim 1, wherein the nylon filler is a nylon 12 filler. 3. The thermal transfer image-receiving sheet according to claim 1, wherein the nylon filler has a spherical shape and a molecular weight of 100,000 to 900,000. 4. The average particle diameter of the nylon filler is
It is 0.01 to 30 μm.
The thermal transfer image-receiving sheet described in 2 or 3 above. 5. The thermal transfer image-receiving sheet according to claim 1, wherein the fixing agent is a resin which is non-dyeable to a sublimable dye.