JPH11309948A - Dye thermal transfer receiving sheet - Google Patents

Abstract

(57) [Summary] [Problem] Even when a receiving sheet is erroneously set on a printer upside down and printing is performed, the ink sheet and the back surface of the receiving sheet do not fuse, and multiple feeding even in a low temperature and low humidity environment. The present invention relates to a receiving sheet having no printer and having excellent printer running properties. A heat transfer sheet having a sheet-like support, a dye-receiving layer for receiving a dye on one side of the support, and a backside coating layer on the other side of the support, wherein the backside coating layer comprises: A dye heat transfer receiving sheet containing at least one selected from a phosphoric acid ester having an aliphatic hydrocarbon group having 6 to 22 carbon atoms, an amine salt thereof, and lecithin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dye thermal transfer receiving sheet (hereinafter abbreviated as receiving sheet).

[0002]

2. Description of the Related Art In recent years, the development of a color hard copy of a thermal transfer system, in particular, a sublimation type thermal transfer printer has been developed.
In a sublimation type thermal transfer printer, an ink sheet containing a sublimable dye layer of three colors (yellow, magenta, cyan) or four colors (yellow, magenta, cyan, black) is heated in order by a thermal head, and each color is heated. By controlling the amount of transfer of the dye, transfer formation of a full-color image excellent in density gradation is possible. Such a thermal transfer printer is used in amusement facilities such as game centers for printing television images or images taken by a video camera on, for example, a postcard type receiving sheet, a sticker type, or a sealing type receiving sheet. Initially, it is rapidly spreading in ordinary households. Such a printer has a mechanism in which a plurality of receiving sheets cut to a fixed size are mounted in a tray and fed from the tray into the printer.

In general, a receiving sheet has a structure in which a dye receiving layer for receiving a dye is provided on one surface of a sheet-like support. On the side of the receiving sheet that does not have a receiving layer, the backside coating layer is used to improve printer paper feedability and runnability, and in the case of a postcard type receiving sheet, to further satisfy writing properties. Is formed.

[0004] The quality required for the back coating layer will be described in more detail.
Examples include prevention of dust and dust from being sucked by static electricity, reduction of the coefficient of friction between receiving sheets, and the like. Hitherto, in order to solve the above-mentioned problem caused by the electrostatic charge, it has been proposed to provide a coating layer containing a conductive substance on the back surface of the receiving sheet and to perform an antistatic treatment (Japanese Patent Publication No. Hei 6-1994). 41
No. 231), and to reduce the coefficient of friction, research has been conducted on selecting an appropriate binder resin and pigment as a material for forming the backside coating layer. Desired results have been obtained for practical performance such as running performance.

[0005] However, with the rapid spread of video printers to general households, for example, users are unfamiliar with the operation of printers. Printing is performed as it is, and the so-called fusing trouble, in which the ink sheet and the coating layer on the back surface of the receiving sheet are adhered by the heat of the thermal head, has frequently occurred recently. When the trouble occurs, the receiving sheet fused with the ink sheet is clogged in the printer, and the printer must be disassembled in order to remove the clogging, which is a very serious problem.

Conventionally, in order to solve the trouble of fusing the back coating layer and the ink sheet, for example, optical (reflection type, transmission type), electrical, magnetic, etc. are previously printed on the back coating layer by printing or the like. A readable detection mark is provided, and when a detection sensor provided in the printer detects the detection mark, it cannot be mechanically printed. However, the provision of such a detection mark not only impairs the appearance but also requires an extra step for printing the detection mark, which causes a problem such as an increase in cost. In addition, if the position of the mark is significantly shifted, the sensor cannot detect the mark, so that the tolerance of the position deviation of the mark is required to be 1 to 2 mm. In order to cut the mark so as to be at an appropriate position, a special cutting machine is required.

On the other hand, it has been studied to solve the problem of fusing between the back coating layer and the ink sheet by incorporating a silicone resin as a release agent in the back coating layer. Certainly, the use of a release agent such as a silicone resin is an effective means for the fusion trouble, but if the silicone resin is added until a sufficient fusion-preventing effect is obtained, the low-temperature and low-humidity especially in wintertime can be obtained. Under the environment, when the back coating layer and the dye receiving layer rub against each other, static electricity is easily generated, so that when the receiving sheet is fed from the tray into the printer, double feeding occurs.

For this reason, there has been a strong demand for a receiving sheet having a back coating layer which does not fuse with an ink sheet and which satisfies excellent printer running properties without double feeding. In fact, no receiving sheet has been proposed.

[0009]

SUMMARY OF THE INVENTION The present invention is intended to prevent the ink sheet and the back surface of the receiving sheet from fusing together even if the receiving sheet is erroneously set on a printer upside down and to print, and to provide a low-temperature, low-humidity environment. The present invention also relates to a receiving sheet having excellent printer running property without double feed.

[0010]

Means for Solving the Problems In order to achieve the above object, the present inventors have conducted extensive studies on the composition of the backside coating layer, the fusion of the ink sheet, and the electrostatic charging when rubbed with the dye receiving layer. By incorporating a specific release agent in the back coating layer, it was found that electrostatic charging when rubbing with the dye receiving layer was small, and that the fusion between the back coating layer and the ink sheet could be improved. The invention has been completed.

That is, the present invention relates to a dye thermal transfer sheet comprising a sheet-like support, a dye-receiving layer for receiving a dye on one side of the support, and a backside coating layer on the other side of the support. The dye heat transfer receiving sheet, wherein the engineered layer contains at least one selected from a phosphoric acid ester having an aliphatic hydrocarbon group having 6 to 22 carbon atoms, an amine salt thereof, and lecithin.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The release agent used in the back coating layer of the present invention includes, for example, triethanolamine monostearyl phosphate, monoethanolamine dioctyl phosphate, triethylamine trilauryl phosphate, and the like. Lecithin extracted from soybeans and egg yolks. Note that lecithin is not limited to natural products as described above, and also includes various synthetic phosphatidylcholine derivatives such as phosphatidylethanolamine and phosphatidylinositol. These release agents may be used alone or in combination of two or more.

The amount of the release agent to be compounded cannot be unconditionally determined depending on the kind of the binder and the antistatic agent used, but is preferably from 3 to 20% by weight of the total solids in the back coating layer. If the amount is less than 3%, it is difficult to obtain the desired effect of preventing the fusion of the ink sheet, while if the amount is more than 20%, the paint for the backside coating layer tends to foam, and the coater is used. In this case, there is a concern that problems such as repelling due to bubbles, roughening of the coating surface such as streaks, and deterioration of coating suitability due to thickening of the paint due to foaming may occur. In addition, the effect of preventing fusion with the ink sheet is saturated, so that further performance cannot be expected, and the cost increases, which is not practical.

As the binder used in the backside coating layer of the present invention, any of the resins widely used in the past can be arbitrarily used. For example, acrylic resins, styrene-butadiene copolymer resins, urethanes Resin, polyvinyl acetal resin, polyester resin, phenoxy resin, polyvinyl alcohol resin, and cellulose resin such as starch.

Further, an antistatic agent may be included for the purpose of suppressing paper feeding, running trouble, and the like due to electrostatic charging. As the antistatic agent, commercially available anionic, nonionic,
A cationic antistatic agent can be used, and fine powders such as titanium oxide and zinc oxide are mixed with impurities and fired,
Inorganic fine powders such as those having enhanced electronic conductivity can also be used.

Further, if necessary, a pigment, an antifoaming agent, a dispersant, a resin crosslinking agent, a colored dye, and the like may be appropriately selected and used. By the way, as pigments, silica, kaolin,
Calcined kaolin, clay, talc, heavy calcium carbonate,
In addition to light calcium carbonate, titanium oxide, barium sulfate, zinc oxide, barium stearate, etc., organic fillers such as polystyrene filler, nylon filler and urea resin filler can also be used arbitrarily.

Although the coating amount of the back coating layer is not particularly limited, it is adjusted in the range of 1 to ²⁰ g / m ² , preferably 3 to 15 g / m ² . By the way, if the coating amount is too small, the effect of the coating layer is not exhibited, and if it is too large, no further effect can be expected, and the cost is increased and it is not practical.

Examples of the sheet-like support used in the present invention include a paper base such as coated paper, art paper and woodfree paper, a resin-coated paper obtained by applying a thermoplastic resin such as polyethylene to a paper base,
Laminated paper obtained by laminating a thermoplastic resin such as polyethylene on a paper substrate, a plastic film such as polyester, nylon, or polyolefin (for example, polypropylene), or a multilayer having a biaxially stretched void mainly composed of a polyolefin resin and an inorganic pigment. A film having a structure is exemplified. Furthermore, not only the above-mentioned material is used alone, but also a dry lamination method, a wet lamination method,
According to a known method such as a melt lamination method,
Those having more than one kind bonded to form a multilayer structure can be used, and the combination is not limited. The receiving layer is formed on one side of the sheet-like support, and the backside coating layer is formed on the other side.

Further, a structure in which a release sheet having a pressure-sensitive adhesive layer and a release agent layer such as a silicone resin is laminated on a surface of the sheet-shaped support on which no receptor layer is formed, that is, a so-called sticker or seal Of course, a structure of the type can also be used. In this case, the back surface coating layer of the present invention is provided on the back surface of the release sheet (the surface on which the release agent layer is not formed).

The thickness of the sheet-like support is 100 to 3
00 μm is preferred. By the way, when the thickness is less than 100 μm, the mechanical strength becomes insufficient, and the rigidity of the receiving sheet obtained therefrom and the repulsive force against deformation become insufficient, and the curling of the receiving sheet generated at the time of printing becomes insufficient. Cannot be prevented. On the other hand, if the thickness exceeds 300 μm, the thickness of the obtained receiving sheet becomes excessively large.
Or, conversely, it causes an increase in the volume of the printer, causing problems such as making it difficult to make the printer compact.

In the receiving sheet of the present invention, the dye receiving layer provided on one surface of the sheet-like support is formed mainly of a dyeing resin capable of dyeing a sublimable dye transferred from an ink ribbon. You. Examples of such a dyeing resin include a polyester resin, a vinyl chloride-vinyl acetate copolymer resin, a polycarbonate resin, and a cellulose derivative.

The coating amount of the receiving layer is adjusted within the range of 1 to 12 g / m ² , preferably 3 to 10 g / m ² . By the way, when the coating amount of the receiving layer is less than 1 g / m ² , the receiving layer cannot completely cover the base material surface, leading to lower image quality, or the receiving layer and the ink sheet may be heated by the thermal head. In some cases, a fusion trouble that causes adhesion may occur. On the other hand, when the coating amount of the receiving layer is 12 g / m ² or more, not only is the effect saturated and uneconomical, but also the strength of the receiving layer is insufficient, and the thickness of the receiving layer is increased, so that the heat insulating effect of the base material is reduced. In some cases, the image density is not sufficiently exhibited, and the image density is reduced.

It is preferable to add a resin crosslinking agent, a slipping agent, a release agent, etc. to the receiving layer of the receiving sheet of the present invention in order to prevent fusion with the ink sheet due to heating of the thermal head. If necessary, other additives such as a colored pigment, a colored dye, a fluorescent dye, a plasticizer, an antioxidant, a pigment, and an ultraviolet absorber may be added. These additives may be mixed with the main component of the receiving layer and applied, or may be applied as a separate coating layer on and / or below the receiving layer.

The receiving layer, the back coating layer and the other coating layers of the receiving sheet of the present invention may be formed by a known coater such as a bar coater, a gravure coater, a comma coater, a blade coater, an air knife coater, and a gate roll coater. It can be formed by coating and drying.

[0025]

The present invention will be described in detail with reference to the following examples, but the scope of the present invention is not limited to these examples.
In Examples, “%” and “parts” all indicate “% by weight” and “parts by weight” unless otherwise specified.

Example 1 Polyethylene terephthalate (PET) having a thickness of 50 μm
On the front and back of the film, a 60 μm-thick multilayer film (trade name: YUPO FPG60, manufactured by Oji Yuka Synthetic Paper) biaxially stretched with a polyolefin containing an inorganic pigment as a main component, and a dry laminating method using a polyester adhesive To give a sheet-like support. On one surface, 100 parts of a saturated polyester resin (trade name: Byron 200, manufactured by Toyobo), 5 parts of a silicone resin (trade name: KF101, manufactured by Shin-Etsu Chemical Co., Ltd.), and a crosslinking agent (trade name: Coronate L for forming a dye receiving layer) Co., Ltd., 5 parts, toluene / MEK = 1/1 diluted solution, coated with a gravure coater so that the coating amount is 8 g / m ² .
Dried. Then, on the other surface, a polyvinyl acetal resin (trade name: Eslek KX) was used as a back surface coating layer.
-1, Sekisui Chemical Co., Ltd.) 17 parts, acrylic resin (trade name: Julimer AT-613, manufactured by Nippon Pure Chemical) 25 parts, barium stearate (manufactured by Nippon Oil & Fats) 41 parts, lecithin (soybean extract lecithin has nonionic activity) 17 parts, a coating consisting of a diluted solution of IPA / water = 1/1 was coated with a bar coater so that the coating amount was 3 g / m ^2, and dried to obtain a receiving sheet.

Example 2 The coating composition of the backside coating layer of Example 1 was prepared using a polyvinyl acetal resin (trade name: Esrec KX-1, manufactured by Sekisui Chemical Co., Ltd.).
10 parts, acrylic resin (trademark: Julimar AT-61)
3, 15 parts by Nippon Junyaku), 25 parts by barium stearate (manufactured by NOF Corporation), cationic antistatic agent (trademark: ST2)
000H, manufactured by Mitsubishi Yuka) 40 parts, lecithin (lean soybean extract lecithin emulsified with nonionic activator) 10 parts, I
A receiving sheet was obtained in the same manner as in Example 1, except that PA / water = 1/1 dilution was used.

Example 3 The coating composition of the backside coating layer of Example 1 was prepared using a polyvinyl acetal resin (trade name: Esrec KX-1, manufactured by Sekisui Chemical Co., Ltd.).
8 parts, acrylic resin (trademark: Julimar AT-61)
3, Nippon Junyaku) 30 parts, barium stearate (Nippon Oil & Fats) 21 parts, cationic antistatic agent (trademark: ST2)
000H, manufactured by Mitsubishi Yuka Co., Ltd.) 33 parts, lecithin (soybean extract lecithin emulsified with nonionic activator) 8 parts, IP
A receiving sheet was obtained in the same manner as in Example 1 except that A / water = 1/1 dilution was used.

Example 4 The coating composition of the backside coating layer of Example 1 was prepared using a polyvinyl acetal resin (trade name: Esrec KX-1, manufactured by Sekisui Chemical Co., Ltd.).
10 parts, acrylic resin (trademark: Julimar AT-61)
3, 25 parts by barium stearate (manufactured by NOF Corporation), 43 parts by barium stearate (trade name: ST2)
000H, manufactured by Mitsubishi Yuka Co., Ltd., 19 parts, lecithin (a soybean extract lecithin emulsified with a nonionic activator), 3 parts, IP
A receiving sheet was obtained in the same manner as in Example 1 except that A / water = 1/1 dilution was used.

Example 5 The coating composition of the backside coating layer of Example 1 was prepared by using a polyvinyl acetal resin (trade name: Esrec KX-1, manufactured by Sekisui Chemical Co., Ltd.).
25 parts, acrylic resin (trademark: Julimer AT-61)
3, 38 parts by Nippon Junyaku), 25 parts of barium stearate (manufactured by NOF Corporation), cationic antistatic agent (trademark: ST2)
000H, manufactured by Mitsubishi Yuka Co., Ltd.), 10 parts, lecithin (soybean extract lecithin emulsified with nonionic activator), 2 parts, IP
A receiving sheet was obtained in the same manner as in Example 1 except that A / water = 1/1 dilution was used.

Embodiment 6

The coating composition of the back coating layer of Example 1 was prepared by mixing 20 parts of a polyvinyl acetal resin (trade name: Esrec KX-1, manufactured by Sekisui Chemical Co., Ltd.) and an acrylic resin (trade name: Julimer AT-613, manufactured by Nippon Pure Chemical) 25 parts, 20 parts of barium stearate (manufactured by NOF Corporation), 10 parts of a cationic antistatic agent (trademark: ST2000H, manufactured by Mitsubishi Yuka), 25 parts of lecithin (a soybean extract lecithin emulsified with a nonionic activator), Except that IPA / water = 1/1 dilution was used.
A receiving sheet was obtained in the same manner as in Example 1. In addition, the backside coating layer paint was easier to foam than the paints of Examples 1 to 6, and it was necessary to pay attention to the application. Example 7 A receiving sheet was obtained in the same manner as in Example 1, except that dioctyl phosphate monoethanolamine was used instead of lecithin as the release agent in the coating composition for the back coating layer in Example 1.

Comparative Example 1 A receiving sheet was obtained in the same manner as in Example 1 except that the release agent lecithin of the coating composition for the back coating layer in Example 1 was not used.

Comparative Example 2 The procedure of Example 1 was repeated, except that the release agent of the coating composition for the back coating layer in Example 1 was replaced with an acrylic modified silicone release agent (trade name: Modiper FS-710, manufactured by NOF Corporation) instead of lecithin. Example 1
A receiving sheet was obtained in the same manner as described above.

The nine types of samples obtained above were evaluated as follows, and the results are shown in Table 1.

(1) Effect of preventing fusion with ink sheet Five sheets are set on a tray of a sublimation thermal transfer video printer (trade name: UP-1800, manufactured by Sony) with the receiving sheet turned upside down, and continuous printing is performed as it is. The state of fusion between the ink sheet and the back coating layer of the receiving sheet was visually evaluated. ◎: No fusion was observed at all, and the paper was discharged normally from the printer. ：: Although the sheet is slightly fused, the sheet is normally discharged from the printer. Δ: The sheet is fused and is normally ejected from the printer, but has a practical problem. X: Adhesion was remarkable, and the receiving sheet was clogged in the printer.

(2) Printer runnability Sublimation thermal transfer video printer (trademark: NV)
-MP5, manufactured by Matsushita Electric Industrial Co., Ltd.)
Continuous printing was performed under an environment of 30 ° C. and 30% RH. This was carried out for 10 sets, that is, 100 sheets in total, and the running property of the receiving sheet to the printer was evaluated. ：: Double feed is not seen at all. X: Double feed occurs frequently, and there is a problem in practice.

(3) Coefficient of friction between papers The coefficient of dynamic friction on the front and back of the receiving sheet was measured using a Tensilon tensile tester (trade name: Tensilon UTM-III-100, manufactured by Toyo Baldwin), load: 1000 g, moving speed: 150 mm / The measurement was performed at 10 ° C. under a 30% environment under the conditions of minutes.

(4) Adhesion force of the front and back of the receiving sheet due to static electricity (electrostatic adhesion force) The receiving sheet which has been neutralized by spraying ionized air with a static eliminator (trade name: SF-1000, manufactured by Iuchi Seieido) is used. After five reciprocations were performed on the front and back sides, the force to separate in the horizontal direction was measured using a Tensilon tensile tester (trade name: Tensilon UTM-III-100, manufactured by Toyo Baldwin).

[0040]

[Table 1]

[0041]

As shown in the examples, the dye thermal transfer receiving sheet of the present invention causes fusion between the ink sheet and the back surface of the receiving sheet even when the receiving sheet is erroneously set in a printer upside down and printed. It is a receiving sheet that has no printer feed and excellent running properties without double feeding in a low-temperature and low-humidity environment, and has extremely high practical value.

Claims (2)

[Claims] 1. A dye thermal transfer sheet having a sheet-like support, a dye receiving layer for receiving a dye on one side of the support, and a backside coating layer on the other side of the support, wherein the backside coating layer is And a phosphoric acid ester having an aliphatic hydrocarbon group having 6 to 22 carbon atoms, an amine salt thereof, and lecithin. 2. The total amount of the phosphoric acid ester having an aliphatic hydrocarbon group having 6 to 22 carbon atoms according to claim 1, its amine salt and lecithin is 3 to the total solid content of the back coating layer. A dye thermal transfer receiving sheet of up to 20% by weight.