JPH0834169A - Thermal transfer image receiving sheet - Google Patents

Abstract

PURPOSE:To provide a thermal transfer image receiving sheet good in sensitivity, image blur resistance and curl characteristics and excellent in antistatic properties. CONSTITUTION:A support 7 is formed by laminating porous films 3 on both surfaces of base paper 1 being either one of raw paper, coated paper and polyolefin resin coated paper and providing antistatic layers 4 on the porous films 3 or by laminating the porous film 3 to the single surface of polyolefin resin coated paper and providing the antistatic layers 4 to the coated paper on the side of the porous film and on the non-laminated side thereof. A barrier layer 5 composed of a specific radiation curable resin compsn. and an image receiving layer 6 are laminated on the antistatic layer 4 on the laminated side of one porous film 3 of the support 7.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a thermal printer,
The present invention relates to a heat-sensitive transfer image-receiving sheet used for recording by transferring a heat transferable dye in heat-sensitive transfer recording of a laser printer or the like.

[0002]

2. Description of the Related Art In recent years, as a means of color hard copy, a device using a thermal transfer recording system has been widely spread because of its advantages such as light weight, compact size, no noise, and excellent operability and maintainability. ing. This thermal transfer recording system is roughly classified into two types, which are a heat melting type and a heat transfer type or a sublimation type. In particular, the latter is excellent in reproducibility of multi-color gradation images and is printed by using a sublimation type thermal transfer type printer.

The principle of such a sublimation type thermal transfer type printer is that an image is converted into an electric signal and then the electric signal is converted into a heat signal by using an electric heating element such as a thermal head, or A transfer sheet coated with a heat transferable dye (hereinafter referred to as a dye) is heated by heating a light absorption heating element with a laser to convert it into a heat signal, and then sublimated or thermally diffused in a medium. By this, the dye transfers the dye from the transfer sheet to the image receiving layer of the heat-sensitive transfer image receiving sheet, thereby recording characters and image information.

The sublimation type thermal transfer recording system is capable of obtaining an image comparable to a multicolor printed matter or a color photograph, and is widely used because it is cheaper than a printing technique or a photographic technique in a case where the number of copies is small. It is being used.

Recently, the field of application of the sublimation type thermal transfer printer, which has been attracting a lot of attention, includes the production of color proofs in the printing field where high image quality close to that of a photograph is required and the output of design images in the design field. It is also practiced to output the characters and image information created in 1 above to a transparent recording sheet using a sublimation thermal transfer printer, and use this as an original for an overhead projector for a presentation at a conference.
Furthermore, card printing systems such as ID cards, license cards, and management cards have been developed, and are responding to a wide range of card needs in the advanced information society.

In particular, in recent years, the demand for color hard copy has increased and it has become necessary to increase the printing speed.
Higher sensitivity is required so that a clear image can be obtained even when the applied energy is low. Higher sensitivity is achieved by reducing the applied energy loss by thinning the film support of the transfer sheet or by increasing the platen pressure in the printer drive section to improve the adhesion between the transfer sheet and the thermal transfer image-receiving sheet. It is known that this is achieved, but in particular, the adhesion between the transfer sheet and the image-receiving sheet for heat-sensitive transfer and the heat insulating property of the image-receiving sheet for heat-sensitive transfer have a great influence on the sensitivity, and therefore, for example, JP-A-63-290790. A synthetic resin film (in the present invention, referred to as a porous film) having a porous structure having excellent heat insulating properties and cushioning properties, as described in Japanese Patent Publication No. 63-231984 and Japanese Patent Publication No. 63-231984, is used as a support. Is effective.

Such a porous film is generally produced by using polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer and the like. Has been done.

On the other hand, the image receiving layer that receives the dye has high sensitivity,
In addition, it is excellent in storage stability such as light resistance and image bleeding resistance. For example, JP-A-57-169370 and 57-207.
No. 50, No. 60-25793, etc., polyester, polycarbonate, vinyl chloride, vinyl acetate, vinyl chloride / vinyl acetate copolymer, polyvinyl butyral, acrylic, styrene, acrylic /
The main component is a thermoplastic resin having a high dye-dyeability such as styrene copolymer and polyurethane.

However, since the image-receiving sheet for heat-sensitive transfer comprising such a porous film and image-receiving layer has low conductivity, static electricity generated during paper feeding and discharging of the printer is likely to accumulate, and as a result, a plurality of heat-sensitive transfer sheets are transferred. Image receiving sheet is fed at one time, so-called double-run sheet feeding occurs, and jamming occurs, which not only hinders transportability within the printer, but also causes dust and dirt on the thermal transfer image receiving sheet. Since, for example, the like easily adheres, the adhesion with the transfer sheet at the time of printing is hindered, and white spots in the transferred image occur.

In order to solve the above problems, for example, in JP-A-59-229395, an image receiving layer is formed on a base material made of a cellulose fiber containing a conductive agent by a size press method or the like. The provided thermal transfer image-receiving sheet is described. Further, in JP-A-4-33894, JP-A-4-69285 and JP-A-4-118292, a thermal transfer in which an antistatic treatment layer containing a conductive agent as a main component is provided between a base material and an image receiving layer. The image receiving sheet for use is written. Further, Japanese Patent Application Laid-Open No. 61-197283 discloses a heat-sensitive transfer image-receiving sheet in which an antistatic layer is provided on the surface of a substrate opposite to the side provided with the image-receiving layer.

By the way, according to the studies by the present inventors, when a conductive agent is added to the image receiving layer or an antistatic layer containing a conductive agent is provided on the image receiving layer, sensitivity and image bleeding resistance It has been found that there is an adverse effect such as a decrease in sex. In particular, image bleeding was remarkable when the image-receiving sheet for thermal transfer after printing was stored for a long period of time.

Even when an antistatic layer containing a conductive agent is provided under the image receiving layer, the conductive agent bleeds out into the image receiving layer with the passage of time, so that deterioration of the quality of the image receiving sheet for thermal transfer cannot be avoided. I wanted As a countermeasure against this, an antistatic layer containing a polymer-type conductive agent typified by polyvinyl benzyl cations and polyacrylic acid-type cations solved the problem of bleed-out of the conductive agent, however, in a high humidity atmosphere. When the heat-sensitive transfer image-receiving sheet was left untreated, the dye in the image-receiving layer diffused and permeated into the antistatic layer swollen due to moisture absorption, causing a problem of image bleeding.

Further, in the heat-sensitive transfer image-receiving sheet having only the antistatic layer provided on the surface of the substrate opposite to the side provided with the image-receiving layer,
Since the charging property on the image receiving layer side sandwiching the porous film having high volume resistivity and the cellulose fiber paper is not improved, the adhesion of dust, lees, etc. to the image receiving layer surface could not be solved.

Further, in pursuit of high conductivity,
When the strongly hydrophilic conductive agent is provided on only one side of the heat-sensitive transfer image-receiving sheet, that is, in the case where all the heat-sensitive transfer image-receiving sheets described above are adopted, curling of the heat-sensitive transfer image-receiving sheet due to moisture absorption and desorption of the conductive agent is performed. It became difficult to control, and in the end, the transportability in the printer was not improved.

As described above, although various proposals have been made for improving the charging property of the heat-sensitive transfer image-receiving sheet, the current technology improves the conductivity without lowering the sensitivity, the resistance to image bleeding and the curl property. It was not possible to obtain an image-receiving sheet for thermal transfer.

[0016]

Accordingly, the present invention provides a higher quality image-receiving sheet for thermal transfer, which has improved antistatic properties while maintaining good sensitivity, resistance to image bleeding and curl characteristics. Is intended.

[0017]

As a result of intensive studies to solve the above problems, the present inventors have found that a radiation-curable resin containing a specific amount of a specific radiation-curable resin and having a specific average acryloyl equivalent. By providing a barrier layer composed of a conductive resin composition between the antistatic layer and the image receiving layer, the conductive agent in the antistatic layer bleeds out into the image receiving layer and the dye in the image receiving layer in the antistatic layer. It has been found that diffusion and penetration into the can be prevented. Further, by providing such a barrier layer, any known conductive agent can be preferably used.

Further, the surface of the support opposite to the side provided with the image receiving layer is also subjected to antistatic treatment, so that it is manufactured by using a polyolefin resin-coated paper having a high volume resistivity, a porous film or a thermoplastic resin. It has been found that the electroconductivity of both surfaces of the heat-sensitive transfer image-receiving sheet can be improved and curl of the heat-sensitive transfer image-receiving sheet which is generated by absorption and dehumidification of the antistatic layer can be controlled.

That is, according to the present invention, a porous film is attached to both sides of a base paper, a coated paper or a polyolefin resin-coated paper,
A support provided with an antistatic layer on the porous film, or a polyolefin film coated on one surface of a polyolefin resin-coated paper, and the antistatic layer on the porous film side and the non-adhered side of the porous film. A support provided with, on the antistatic layer on the side of one porous film adhered in the support, at least one or more acryloyl equivalent of 10 to 50% by weight of a radiation curable resin is contained, An image-receiving sheet for thermal transfer, comprising a barrier layer made of a radiation-curable resin composition having an average acryloyl equivalent of 100 to 190, and an image-receiving layer.

The heat-sensitive transfer image-receiving sheet of the present invention is characterized in that at least one of the radiation-curable resins having an acryloyl equivalent of 150 to 280 is preferably a hydrophilic radiation-curable resin.

The heat-sensitive transfer image-receiving sheet of the present invention will be described in detail below. First, the structure of the image-receiving sheet of the present invention will be described with reference to FIGS. 1 and 2
FIG. 3 is a cross-sectional view showing a heat-sensitive transfer image-receiving sheet of the present invention.

In FIG. 1, a porous film 3 is attached to both sides of a base paper 1 which is either a base paper, a coated paper or a polyolefin resin coated paper, and an antistatic layer 4 is formed on the porous film 3.
And a barrier layer 5 and an image receiving layer 6 are laminated on one of the antistatic layers 4.

In FIG. 2, the porous film 3 is attached to one surface of the polyolefin resin-coated paper 2 and the porous film 3 is attached.
Side and the non-sticking side of the porous film, the antistatic layer 4 is provided, and the barrier layer 5 and the image receiving layer 6 are further laminated on the antistatic layer on the porous film 3.

(1) Support As a preferred form of the support of the image-receiving sheet for heat-sensitive transfer in the present invention, a porous film is attached to both sides of a base paper, either base paper, coated paper or polyolefin resin-coated paper. Then, an antistatic layer is provided on the porous film, or a porous film is attached to one surface of the polyolefin resin-coated paper, and the antistatic layer is provided on the upper side of the porous film and the non-adhered side of the porous film. Is a support provided with.

The image-receiving sheet for heat-sensitive transfer according to the present invention,
When a sandwich structure with a porous film as shown in FIG. 1 is used, by using a base paper, a coated paper or a polyolefin resin-coated paper as a material to be adhered to the porous film, it is possible to obtain appropriate rigidity and bendability. It is possible to obtain the image receiving sheet for heat transfer. Further, it is preferable that the base paper, the base paper used for the coated paper and the polyolefin resin-coated paper, and the coated paper are subjected to a calendar treatment with a machine calendar, a super calendar, a thermal calendar or the like for the purpose of improving the surface smoothness. .

In the present invention, base paper means natural pulp,
Synthetic pulp and mixed pulp thereof are pulp papers produced by using a Fourdrinier paper machine and the like, and examples thereof include high-quality papers, medium-quality papers, single-gloss base papers, tracing papers, and non-woven fabrics.

In the present invention, the coated paper means a binder polymer such as polyvinyl alcohol or styrene-butadiene latex and a white pigment such as calcium carbonate, titanium dioxide, satin, alumina or talc on the surface or both surfaces of the above-mentioned base paper. A coating layer containing a colored pigment as a main component is provided by a coating method such as a blade coater or an air knife coater. For example, art paper, coated paper, lightweight coated paper, slightly coated paper, cast coat. Examples include paper.

In the present invention, the polyolefin resin-coated paper can be coated by a melt extrusion method,
For example, homopolymers of α-olefins such as ethylene and polypropylene, copolymers composed of two or more kinds of α-olefins, copolymers of α-olefins as a main component with other monomers copolymerizable therewith, and those The mixture and the like are provided on both sides of the above-mentioned base paper or coated paper.

In the polyolefin resin coating layer of such polyolefin resin coated paper, white pigments such as titanium dioxide, alumina and calcium carbonate, talc, zinc oxide,
Coloring pigments, fatty acid amides such as stearic acid amide, arachidic acid amide, zinc stearate, calcium stearate, aluminum stearate, magnesium stearate, zinc palmitate, zinc myristate, fatty acid metal salts such as calcium palmitate, hindered phenols. , Various stabilizers and antioxidants such as hindered amine, phosphorus-based and sulfur-based, blue pigments and dyes such as cobalt blue, ultramarine blue, cealine blue and phthalocyanine blue, optical brighteners, ultraviolet absorbers, dispersants and lubricants Various additives can be added.

The image-receiving sheet for heat-sensitive transfer according to the present invention has a porous film adhered to one side as shown in FIG. 2, and further comprises a radiation-curable resin composition having curing shrinkage on the porous film. In the case where the barrier layer is provided, curling tends to occur on the side of the porous film, and for the purpose of preventing this, it is preferable to use a polyolefin resin-coated paper as a material to be attached to the porous film.

As such a polyolefin resin-coated paper, it is more preferable to use a base paper as described in Japanese Patent Laid-Open No. 3-10889, which has been calendered, and at least it is laminated with a porous film. Attach the polyolefin resin coating layer on the opposite side to the
Density specified by K6748 0.95 g / cm ³
More preferred is a polyolefin resin-coated paper which is a polyolefin resin composition containing the above high-density polyethylene in the range of 10 to 80% by weight. By using such a polyolefin resin-coated paper, it is possible to obtain an image-receiving sheet for heat-sensitive transfer which has appropriate stiffness and bendability and is excellent in curling characteristics.

In the present invention, any porous film can be preferably used as long as it has good smoothness and heat insulating properties. From the viewpoint of material, for example, polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride are used. , Polyvinylidene chloride, polyvinyl alcohol, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, and synthetic resins such as polyamide.

In particular, for the purpose of increasing the sensitivity, it is preferable that the density of the non-porous film made of the same material is 85% or less. The density of a normal non-porous film varies depending on the material, but is about 1.0 to 0.9 for polyolefins such as polyethylene and polypropylene, and about 1.4 for polyester.

As in the present invention, by using a porous film having a density of 85% or less of the density of the non-porous film, it is possible to print with high density even with a low heat energy. A specific example of the polyester film is Dia foil W900 manufactured by Dia foil Hoechst Co., Ltd. (a foamed white polyester film having a density of 1.0 g / cm ^{3 and} a density of a non-porous polyester film of 1.4).
In comparison with the polypropylene film, YUPO FPG manufactured by Oji Yuka Synthetic Paper Co., Ltd. (density about 0.
In 77g / cm ^3, 85 of non-porous polypropylene film
%) And TOYOPEARL manufactured by Toyobo Co., Ltd. (density of about 0.6 g / c
In m ^3, 66%) or the like of the non-porous polypropylene film.

The thickness of the porous film in the present invention is preferably 20 to 60 μm. When the thickness of the film is less than 20 μm, the heat insulating property is lowered, so that the sensitivity is lowered, and when it exceeds 60 μm, the rigidity is lowered due to the limitation of the thickness of the support, and Bending is likely to occur in the transport guide.

In the present invention, the porous film must be firmly adhered to the surface of the base paper, the coated paper or the polyolefin resin-coated paper in order to suppress the occurrence of blisters during printing with a printer. Is. Raw paper, coated paper or polyolefin resin coated paper and a method of sticking the porous film, vinyl acetate-based, polyurethane-based, dry lamination method using an organic solvent solution such as acrylic resin as an adhesive, starch, polyvinyl alcohol, Wet laminating method using an aqueous solution of casein or the like or emulsion of vinyl acetate type, polyurethane type, acrylic type resin or the like as an adhesive, hot melt laminating method using a wax type resin as an adhesive and molten polyolefin extruded from a T-die. It can be attached by using a polylamination method or the like using a system resin as an adhesive.

In particular, the image-receiving sheet for heat-sensitive transfer of the present invention is
By adhering the base paper and the porous film by the polylamination method, the polyolefin resin coating layer can also serve as an adhesive layer.

Here, the dry coating amount of the adhesive when the dry laminating method or the wet laminating method is used is preferably 0.5 g / m ² or more. When the dry coating amount of the adhesive is less than 0.5 g / m ² , the adhesive strength is insufficient and causes blister. When the hot melt laminating method and the poly laminating method are used, the coating amount of the adhesive is preferably about 1 to 30 g / m ² . Adhesive coating amount is 1g / m ²
If it is less than the above range, the adhesive strength will be insufficient to cause blister, and if it exceeds 30 g / m ² , the rigidity will be too large, and the curling characteristics of the heat-sensitive transfer image-receiving sheet will be deteriorated.

The thickness of the support in the present invention is not particularly limited, but is usually about 50 to 300 μm. If the thickness of the substrate is less than 50 μm, the rigidity of the image-receiving sheet for thermal transfer is lowered, and bending of the transport guide of the printer is likely to occur. If it exceeds 300 μm, the rigidity is too high. It is easy for bite failure to occur in the transport roll of the printer.

As the antistatic layer in the present invention, an image-receiving sheet for heat-sensitive transfer is usually used, for example, office,
15 ~ 30 ℃, 30 ~ as measured at stores, factories, etc.
In an atmosphere of 90% RH, the surface specific resistance of both surfaces of the image-receiving sheet for thermal transfer is preferably 1 × 10 ¹² Ω · cm or less, more preferably 1 × 10 ¹⁰ Ω · cm or less.

There is no particular limitation on such a conductive agent, and anionic conductive agents such as higher alcohol sulfate ester salts, aliphatic alcohol phosphate ester salts and aliphatic amide sulfonates, aliphatic amine salts, quaternary Cationic conductive agents such as ammonium salts and pyridine derivatives, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenols, polyoxyethylene alkyl esters, sorbitan alkyl esters, polyoxyethylene sorbidan alkyl esters, etc. Nonionic conductive agents, amphoteric conductive agents such as alkylbetaines, alkylimidazolines, and alkylalanines; various conductive agents such as polyvinylbenzyl cations and conductive resins such as polyacrylic acid cations, or 2 Use in combination with more than one type Can.

In the present invention, the antistatic layer may be mixed with a binder polymer such as polyurethane, acryl, styrene, acryl-styrene, polyvinyl alcohol, vinyl acetate-polyvinyl alcohol copolymer, or the writability, if necessary. And white pigments such as silica, alumina, titanium dioxide, calcium carbonate, kaolin, clay, zinc oxide, barium sulfate, organic pigments, styrene, styrene-acryl, melamine, polydimethylsiloxane, etc. Polymer beads can be added.

The antistatic layer in the present invention is prepared by dissolving or emulsifying an antistatic layer containing a conductive agent as a main component in an organic solvent or water, and then air knife method, gravure method, wire bar method, rod. Method, reverse roll method, extrusion die method, blade method, can be achieved by providing a coating method such as a slide hopper method, especially when the thermal transfer image receiving sheet is stacked, the image receiving layer of the thermal transfer image receiving sheet For the antistatic layer on the side opposite to the side, it is preferable to use a polymeric conductive agent such as polyvinyl benzyl cation or polyacrylic acid cation so that the bleed-out conductive agent does not contaminate the surface of the image receiving layer.

The coating amount of the antistatic layer in the present invention is
0.2 to 30 g / m ² is preferable. If the coating amount of the antistatic layer is less than 0.2 g / m ² , it is difficult to obtain good conductivity,
^{On the other hand} , if it exceeds 30 g / m ² , the heat insulating property, which is an advantage of the porous structure of the porous film, cannot be effectively utilized and the sensitivity is lowered.

In the present invention, when the antistatic layer is provided on the polymorphic film or the polyolefin resin coating layer, the adhesion between the antistatic layer and the porous film or the polyolefin resin coating layer is improved. In addition, the surface of the porous film or the polyolefin resin coating layer can be modified by corona discharge treatment, plasma treatment, flame treatment or the like.

(2) Barrier Layer In the present invention, the barrier layer is formed from a composition containing a reactive group such as a methacryloyl group, an epoxy group and an acryloyl group which causes a crosslinking reaction by radiation. A composition comprising a radiation-curable resin containing an acryloyl group having high reactivity is preferable. Here, the barrier layer contains at least one or more kinds of radiation-curable resin having an acryloyl equivalent of 150 to 280 in a range of 10 to 50% by weight, and has an average acryloyl equivalent of 100.
~ 190 to form a radiation curable resin composition, it is possible to prevent the conductive agent in the antistatic layer provided under the barrier layer from bleeding out into the image receiving layer, and the dye in the image receiving layer, It can be prevented from passing through the barrier layer and diffusing and penetrating into the antistatic layer. Here, when the average acryloyl equivalent of the radiation curable resin composition is less than 100, or the content of the radiation curable resin having an acryloyl equivalent of 150 or more and 280 or less is less than 10% by weight, the antistatic layer Since it takes a long time to absorb and dehumidify the toner, it becomes difficult to improve the conductivity immediately after printing when the water content of the heat-sensitive transfer image-receiving sheet is reduced. If the average acryloyl equivalent of the radiation curable resin composition exceeds 190, or if the content of the radiation curable resin having an acryloyl equivalent of 150 or more and 280 or less exceeds 50% by weight, the curability decreases. As a result, the conductive agent in the antistatic layer bleeds out into the image receiving layer, and the dye in the image receiving layer diffuses and permeates into the barrier layer.

The coating amount of the barrier layer of the present invention is 0.
1 to 25 g / m ² is preferred. The coating amount of the barrier layer is 0.1
When it is less than g / m ² , it is difficult to form a uniform film without pinholes when it is applied on a porous film that is originally low in smoothness. The conductive agent bleeds out into the image receiving layer, and the dye in the image receiving layer diffuses and penetrates into the barrier layer.
Further, if the coating amount of the barrier layer exceeds 25 g / m ² , it is not preferable because the conductivity of the antistatic layer is hindered, and the heat insulating property, which is an advantage of the porous film, cannot be effectively utilized and the sensitivity is reduced. Will fall.

In the present invention, the radiation curable resin composition is a mixture of at least two kinds of radiation curable resins, and the average acryloyl equivalent is
It is the arithmetic average value of the acryloyl equivalent of each radiation curable resin.

Typical radiation-curable resins which meet the above matters will be exemplified below, but the present invention is not limited to them. In addition, () shows the acryloyl equivalent.

A) Aronix M-101 (236),
Aronix M-120 (272), Aronix M-
132 (262), Aronix M-150 (11
1), Aronix M-152 (248), Aronix M-154 (230), Aronix M-210 (2
56), Aronix M-205 (267), Aronix M-215 (185), Aronix M-220.
(141), Aronix M-233 (255), Aronix M-305 (99), Aronix M-309
(99), Aronix M-310 (157), Aronix M-315 (141), Aronix M-320.
(215), Aronix M-325 (179), Aronix M-400 (96), Aronix M-610.
0 (225), Aronix M-6250 (225),
Aronix M-6300 (239), Aronix M
-6500 (223), Aronix M-7100 (1
88), Aronix M-8030 (119), Aronix M-8060 (136) and Aronix M-8.
100 (155) or more, Aronix series manufactured by Toagosei Chemical Industry Co., Ltd.,

B) Kayarad TC-100S (27
0), Kayarad R-564 (249), Kayarad H
DDA (113), Kayarad NPGDA (106),
Kayarad TPGDA (150), Kayarad MAND
A (156), Kayarad HX-220 (270), Kayarad R-551 (256), Kayarad R-712
(242), Kayarad R-604 (163), Kayarad R-684 (152), Kayarad GPO-303
(232), Kayarad TMPTA (148), Kayarad THE-330 (214), Kayarad TPA-3
20 (206) and Kayarad TPA-330 (23
5) Above, Kayarad series manufactured by Nippon Kayaku Co., Ltd.,

C) NK ester APG-10G (19
2), NK ester AMP-20G (236), NK ester A-SA (216), NK ester LA (24)
0), NK ester A-HD (113), NK ester A-NPG (106), NK ester APG-200.
(150), NK ester APG-400 (268),
NK Ester A-BPE-4 (256), NK Ester TMPT (113), NK Ester A-TMPT (9
9), NK ester A-TMMT (88) or higher, NK ester series manufactured by Shin Nakamura Chemical Co., Ltd.

Further, for the purpose of further improving the antistatic property of the heat-sensitive transfer image-receiving sheet of the present invention, at least one of the radiation-curable resins having an acryloyl equivalent of 150 to 280 forming the barrier layer is a hydroxyl group in the molecule. It is preferable to use a hydrophilic radiation-curable resin containing a hydrophilic group such as a carboxyl group or modified with ethylene oxide.

Typical radiation-curable resins which meet the above matters will be exemplified below, but the present invention is not limited to them. In addition, () shows the acryloyl equivalent.

A) Aronix M-240 (142),
Aronix M-245 (261), Aronix M-
5300 (277), Aronix M5400 (26
4), Aronix M5500 (216), Aronix M-5700 (222) and above Toagosei Co., Ltd. Aronix series

B) Kayarad R-128H (222),
Kayarad PEG400DA (261), Kayarad R
-167 (187), Kayarad PET30 (99) or higher Kayarad series manufactured by Nippon Kayaku Co., Ltd.

C) NK ester A-200 (154),
NK Ester A-400 (254), NK Ester 70
2A (222), NK ester A-SA (216), N
K ester AMP-20G (236), NK ester A
-TMM-3 (99), NK ester A-TMM-3L
(206) or more Shin Nakamura Chemical Co., Ltd. NK ester series

In the barrier layer of the present invention, barium sulfate, titanium dioxide, zinc sulfide, calcium carbonate, magnesium oxide, aluminum oxide, titanium phosphate, if necessary, for the purpose of improving the whiteness of the heat-sensitive transfer image-receiving sheet. White pigments and coloring pigments such as satin white, talc and clay, cobalt blue, ultramarine blue, cerian blue,
Blue pigments such as phthalocyanine blue and dyes can be added. Further, various additives such as a fluorescent whitening agent, an antioxidant, an ultraviolet absorber, a stabilizer, a radical polymerization initiator, a surfactant and a lubricant may be added within a range that does not impair the effects of the present invention. . Here, the fluorescent whitening agent added to the barrier layer is not particularly limited, but a fluorescent whitening agent containing a thiophene skeleton excellent in radiation resistance, weather resistance and the like is particularly preferable.

In the present invention, the ionizing radiation for curing the radiation curable resin composition is generally ultraviolet light, α
Ray, β ray, γ ray, X ray, electron beam, etc.
Rays, β rays, γ rays, or X rays are accompanied by the problem of danger to the human body, so ultraviolet rays and electron rays, which are easy to handle and widely used industrially, are effective.

In the present invention, when an electron beam is used,
The irradiation electron dose is preferably in the range of about 0.1 to 10 Mrad. Here, if it is less than 0.1 Mrad, sufficient curing effect cannot be obtained and curing is insufficient, and if it exceeds 10 Mrad, the support is deteriorated, which is not preferable. As an electron beam irradiation method, a scanning method, a curtain beam method, or the like can be used, and the electron beam acceleration voltage is preferably about 100 to 300 KV.

When ultraviolet rays are used in the present invention, a sensitizer must be added to the radiation curable resin composition. Specific examples thereof include di- or trichloroacetophenone. Acetophenones, benzophenone, Michler's ketone, benzyl, benzoin,
There are benzoin alkyl ether, benzyl dimethyl ketal, tetramethyl thiuram monosulfide, thioxanthones, azo compounds and the like, and they are selected from the viewpoint of the polymerization reaction type of the radiation curable resin, stability, compatibility with a radiation irradiation device, and the like. The amount of the sensitizer used is usually about 1 to 5% by weight based on the radiation curable resin. In addition, a storage stabilizer such as hydroquinone may be used in combination with the sensitizer. As the light source, for example, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, a xenon lamp, a tungsten lamp or the like is used.

The method of applying the barrier layer in the present invention includes, for example, a blade method, an air doctor method, a squeeze method, an air knife method, a reverse roll method, a gravure roll and a transfer roll method,
Methods such as bar method and curtain method are used. or,
For the purpose of obtaining a higher smooth surface, for example, Japanese Patent Laid-Open No. 4-1
A method of transferring a highly smooth metal roll or the surface of a plastic film to the barrier layer as described in Japanese Patent No. 13891 can also be used. That is, a barrier layer made of a radiation-curable resin composition is applied between a porous film and a mirror-finished metal roll or a highly smooth plastic film, and the metal roll or the plastic film is peeled off after being irradiated with radiation to be cured. It is a method of obtaining a highly smooth barrier layer.

(5) Image Receiving Layer In the present invention, the dye-dyeing resin, which is the main component of the image receiving layer, has a strong interaction with the dye and can be stably diffused into the resin. Any of them can be preferably used, for example, JP-A-57-169370 and JP-A-57-20.
Polyester resins, polyacrylic acid ester resins, polycarbonate resins, polyvinyl acetate resins such as those disclosed in JP-A-750 and JP-A-60-25793,
Styrene acrylate resin, polyurethane resin, polyamide resin, urea resin, polycaprolactone resin, polystyrene resin, polyvinyl chloride, polyacrylonitrile resin, etc. can be used. Further, copolymers such as vinyl chloride / vinyl acetate copolymers and styrene / butadiene copolymers containing at least one of the constitutional units of these resins as a main component can also be used. Furthermore, these resins can be used alone or in combination of two or more. These resins are dissolved in water or an organic solvent and applied on a support, or
It can be applied as an emulsion.

In the present invention, a releasing agent may be added to the image receiving layer in order to prevent blocking with the transfer sheet. Examples of such a releasing agent include higher fatty acids or esters thereof, amides or metal salts thereof, waxes such as shellac wax, montan wax, carnauba wax, polyethylene wax, Teflon powder, fluorine-based or phosphate-based surfactants. Modified silicone oils such as silicone oil, amino modified silicone, epoxy modified silicone, alkyd modified silicone and polyester modified silicone can be used. Further, as the silicone compound, a reaction-curable type, an ionizing radiation-curable type, a catalyst-curable type and the like can be used if necessary.

The coating amount of the image receiving layer in the present invention is preferably 0.5 to 30 g / m ^{2 in} terms of dry coating amount. When the coating amount of the image receiving layer is less than 0.5 g / m ² , a good transfer image cannot be obtained because the sensitivity is lowered, and when it exceeds 30 g / m ² , the conductivity of the antistatic layer is impaired. Is not preferable. As a method for applying the image receiving layer, a general application method such as an air knife method, a gravure method, a wire bar method, a rod method, a reverse roll method, an extrusion die method, a blade method, and a slide hopper method is used.

In the present invention, in order to improve the adhesiveness between the barrier layer and the image receiving layer, the surface of the barrier layer can be modified by corona discharge treatment, plasma treatment, flame treatment or the like.

[0068]

According to the present invention, a thermal transfer image-receiving sheet comprising a support and a barrier layer comprising a radiation-curable resin composition and an image-receiving layer for receiving a dye from a thermal transfer medium is laminated on the surface of a support to prepare a base paper or a coating. Porous film is adhered to both sides of paper or polyolefin resin-coated paper, a support provided with an antistatic layer on the porous film, or a porous film is adhered to one side of polyolefin resin-coated paper, A support having an antistatic layer provided on the body film side and the porous film non-adhering side, and radiation having a specific acryloyl equivalent on the antistatic layer on the one porous body film adhering side of the support. Since a barrier layer and an image receiving layer each comprising a radiation curable resin composition containing a specific amount of curable resin and having a specific average acryloyl equivalent are laminated, the conductivity in the antistatic layer is reduced. Does not bleed out into the image-receiving layer, or the dye in the image-receiving layer does not diffuse and penetrate into the antistatic layer, so that the sensitivity, image bleeding resistance and curl characteristics are good, and the antistatic property is excellent. An image receiving sheet for thermal transfer can be obtained.

[0069]

EXAMPLES Next, the present invention will be described in more detail by way of examples, but the contents of the present invention are not limited to these. Further, "parts" and "%" shown in Examples and Comparative Examples are parts by weight and% by weight, respectively. The ink donor sheet for evaluation was prepared as follows.

[Transfer sheet] A biaxially stretched polyester film having a film thickness of 5 μm, which has been subjected to a heat treatment, was coated with a heat resistant slipping layer coating solution having the following composition by a wire bar to give a dry coating amount of 0.5.
It was coated and dried so as to be g / m ^2, and was irradiated with ultraviolet rays with a high pressure mercury lamp of 140 W / cm ² to cure it. (Heat resistant slipping layer coating solution) TMPTA (Daiichi Kogyo Seiyaku) 10 parts Lipoxy SP1509 (Showa High Polymer) 20 parts Trefil E500 (Toray Dow Corning Silicone) 9 parts KF-393 (Shin-Etsu Silicone) 0.3 parts Coronate L ( Nippon Polyurethane) 0.3 parts Darocur 1173 (Merck) 0.4 parts Ethyl acetate 40 parts Isopropyl alcohol 20 parts

Further, a coloring material layer coating liquid having the following composition was ground on a surface opposite to the heat resistant slipping layer for 2 days by a ball mill, and then dried with a wire bar so that the dry coating amount was 1.5 g / m ^2. Then, a transfer sheet was produced. (Coating liquid for color material layer) Kayaset Blue 906 (Nippon Kayaku) 10 parts Ethylcellulose 10 parts Siloide 244 (Fuji Davison) 10 parts Isoprophyl alcohol 30 parts

(Evaluation Method) The heat-sensitive transfer image-receiving sheets of Examples and Comparative Examples listed below were evaluated by the following methods. (1) Surface resistivity The surface resistivity of both surfaces of each image-receiving sheet for heat-sensitive transfer, which was left in an atmosphere of 20 ° C. and 50% RH for 24 hours, was measured by a Yokogawa Hurate Packard high resistance meter.

(2) Sensitivity: The image receiving layer of each thermal transfer image receiving sheet and the color material layer of the transfer sheet are superposed facing each other, and after printing a cyan step wedge chart with a sublimation type thermal transfer printer S3600-30 manufactured by Mitsubishi Electric Corporation, The transfer density of the most sensitive area was measured with a Macbeth reflection densitometer.

(3) Image bleeding resistance After the image receiving layer of each heat-sensitive transfer image-receiving sheet and the color material layer of the transfer sheet are superposed facing each other and printed using a sublimation type thermal transfer printer S3600-30 manufactured by Mitsubishi Electric Corporation, 30% RH, 50% R with the thermal transfer image receiving sheet kept constant at 20 ° C
The bleeding of dots after standing for 3 months in an atmosphere with H and 90% RH changed was observed and evaluated according to the following criteria. 5: Bleeding is not seen even when the printed portion of the heat-sensitive transfer image-receiving sheet is observed with a loupe. 4: When the printed portion of the thermal transfer image-receiving sheet is observed with a loupe, it can be seen that the image is slightly blurred. 3: When the printed portion of the heat-sensitive transfer image-receiving sheet is observed with a loupe, it can be seen that the image is blurred. 2: It can be seen with the naked eye that the printed portion of the heat-sensitive transfer image-receiving sheet is slightly blurred. 1: It can be seen with the naked eye that the printed portion of the heat-sensitive transfer image-receiving sheet is blurred.

(4) Whiteout of image In an atmosphere of 20 ° C. and 30% RH, the image receiving layer of each heat-sensitive transfer image-receiving sheet and the color material layer of the transfer sheet are superposed so as to face each other, and sublimation-type thermal transfer manufactured by Mitsubishi Electric Corporation Printer S3600-3
The degree of white spots in the image printed with 0 was observed and evaluated according to the following criteria. ⊚: No white spots are observed, which is good. ◯: Fine white spots were found in one or two places. Δ: Many fine white spots are seen and the quality is impaired. X: Many large white spots, and the quality is significantly impaired.

(5) Curl characteristics 30% RH, 50% RH, 90% R with constant 20 ° C.
After being left for 24 hours in an atmosphere where H and humidity are changed, when 10 sheets of each of the heat-sensitive transfer image-receiving sheets (A4 size) were placed on a flat table with the image-receiving layer surface facing upward, the four corners of the heat-sensitive transfer image-receiving sheet were The distance from the tabletop was measured and the average value was calculated.
Further, curl characteristics immediately after printing an image were measured in the same manner in an atmosphere of 20 ° C. and 50% RH, and evaluated according to the following criteria. ◎: 0.5 cm or less ○: 0.6 to 0.9 cm △: 1.0 to 1.5 cm ×: 1.5 cm or more

(6) Transportability within the printer 30% RH, 50% RH, 90% R at a constant 20 ° C.
When 50 sheets of each thermal transfer image receiving sheet were printed by a sublimation type thermal transfer printer S3600-30 in an atmosphere where the temperature was changed to H and humidity, the number of jamming or bending was measured and evaluated according to the following criteria. ◎: 0 sheets ○: 1-2 sheets △: 3-5 sheets ×: 6 sheets or more

Examples 1 to 8 Bleached hardwood sulfite pulp (LBSP) 50% by weight
After bleached softwood sulfite pulp (NBSP) 30% by weight and hardwood kraft pulp (LBKP) 20% by weight, a base paper (basis weight 120 g / m ² ) was subjected to a super calender treatment, and then corona discharge treatment was applied to both sides. A polyolefin resin coating layer made of low density polyethylene resin with a density of 0.92 g / cm ^{3 on} the surface and a density of 0.96 g / c on the back surface.
40 parts by weight of m ³ high-density polyethylene resin and a density of 0.9
A polyolefin resin coating layer consisting of 60 parts by weight of a low-density polyethylene resin of 26 g / cm ³ was applied by a melt extrusion method so that both sides had a weight of 24 g / m ² to prepare a polyolefin resin-coated paper.

Both sides of the polyolefin resin coated paper were subjected to corona discharge treatment, and a biaxially oriented polypropylene film having a porous structure on the front side (Toyopearl S manufactured by Toyobo).
L, a density ratio of 66% with respect to the density of the non-porous polypropylene film, and a thickness of 30 μm) was applied by applying an adhesive coating solution having the following composition so that the dry coating amount was 2 g / m ² . On the polyolefin resin coating layer on the back side, the antistatic layer coating liquid A having the following composition was applied so that the dry coating amount was 3 g / m ² . (Adhesive coating liquid formulation) Takelac A-606 (Takeda Chemicals, Polyurethane Polyol) 90 parts Takenate A-12 (Takeda Chemicals, Polyisocyanate) 10 parts Ethyl acetate 90 parts (Antistatic coating liquid formulation A) PVA117 ( Kuraray's polyvinyl alcohol) 50 parts Glyoxal 5 parts Saftomer STH165 (Mitsubishi Yuka's acrylic conductive agent) 45 parts Water 300 parts

Next, an antistatic layer having the following composition was coated on the porous film so that the dry coating amount was 3 g / m ^2, and after drying, the radiation curable resin composition shown in Table 1 was dry coated. The amount was 3 g / m ^2, and the barrier layer was cured by irradiation with an electron beam under the conditions of an accelerating voltage of 150 KV and an irradiation dose of 4 Mrad. (Compounded with antistatic layer coating liquid) ADEKA COL CC9 (Asahi Denka Kogyo, conductive agent) 65 parts Lamic F2205MC (Takeda Chemical Industries, titanium-containing polyurethane polyol) 30 parts Lamic B Heartner (Takeda Chemical Industries, isocyanate) 5 parts Toluene 400 copies

Further, the following image receiving layer coating liquid was applied onto the barrier layer so that the dry coating amount was 4.0 g / m ^2, and after aging, it was aged for 3 days in an atmosphere of 30 ° C. and 50% RH. Processing was carried out to obtain image-receiving sheets for thermal transfer of Examples 1 to 8. (Image-bearing layer coating liquid) Vylon 200 (Toyobo, polyester resin) 55 parts Vylon 290 (Toyobo, polyester resin) 30 parts MIBK-ST (Nissan Chemical Co., Ltd., colloidal silica) 13.5 parts SF8417 (Toray Corning Silicone) , Amino-modified silicone oil) 1 part SF8411 (Toray Industries Corning Silicone, epoxy-modified silicone oil) 0.5 part Toluene 150 parts Methyl ethyl ketone 150 parts

Example 9 The radiation curable resin 1 forming the barrier layer in Table 1 was added to
NK Ester A-400 (ethylene oxide modified, addition mole number 4, acryloyl equivalent 254, manufactured by Shin-Nakamura Chemical Co., Ltd.) in the same manner as in Example 2 except that the image-receiving sheet for thermal transfer of Example 9 was used. Was produced.

Example 10 The radiation curable resin 1 forming the barrier layer in Table 1 was
An image-receiving sheet for heat-sensitive transfer of Example 10 was prepared in the same manner as in Example 2 except that Aronix M-5400 (carboxyl group modified at one end, acryloyl equivalent 264, manufactured by Toagosei Co., Ltd.) was used.

Comparative Examples 1 to 9 Image-receiving sheets for thermal transfer of Comparative Examples 1 to 9 were prepared in the same manner as in Example 1 except that the radiation curable resin compositions shown in Table 1 were used.

[0085]

[Table 1]

The evaluation results of Examples 1 to 10 and Comparative Examples 1 to 9 are summarized in Tables 2 and 3.

[0087]

[Table 2]

[0088]

[Table 3]

(Evaluation) With the image-receiving sheets for thermal transfer according to the present invention of Examples 1 to 10, it was possible to improve the white spots and curl characteristics of the image without lowering the sensitivity and the resistance to image bleeding. Particularly in Examples 9 and 10, since the hydrophilic radiation curable resin was contained in the barrier layer,
No white spots in the image or curl characteristics were generated, and the curl characteristics immediately after printing were also good. However, Comparative Example 1
In the image-receiving sheet for heat-sensitive transfer, since the content of the radiation curable resin having an acryloyl equivalent of 150 or more and 280 or less was too small, the curl characteristics at low humidity and the curl characteristics immediately after printing were inferior. In the image-receiving sheets for heat-sensitive transfer of Comparative Examples 2 and 3, the content of the radiation curable resin having an acryloyl equivalent of 150 or more and 280 or less was too large, and therefore the image bleeding resistance and the curl property at high humidity were poor. In the image-receiving sheet for heat-sensitive transfer of Comparative Example 4, the curable properties at low humidity and the curl properties immediately after printing were inferior because the average acryloyl equivalent of the radiation curable resin composition was less than 100. In the image-receiving sheet for heat-sensitive transfer of Comparative Example 5, the average acryloyl equivalent of the radiation-curable resin composition exceeded 190, so that the image bleeding resistance and the curling property at high humidity were deteriorated.
The heat-sensitive transfer image-receiving sheets of Comparative Examples 6 and 7 did not contain a radiation-curable resin having an acryloyl equivalent of 150 or more and 190 or less, and thus the curl characteristics at low humidity were inferior. Since the image-receiving sheets for thermal transfer of Comparative Examples 8 and 9 contained the radiation curable resin having an acryloyl equivalent of more than 280, the image bleeding resistance and the curling property at high humidity were deteriorated.

Example 11 Bleached hardwood sulfite pulp (LBSP) 50% by weight
After bleached softwood sulfite pulp (NBSP) 30% by weight and hardwood kraft pulp (LBKP) 20% by weight, a base paper (basis weight 80 g / m ² ) is supercalendered and then has a porous structure on both sides. Biaxially oriented polypropylene film (manufactured by Toyobo, Toyopearl SL, density ratio 66 to the density of non-porous polypropylene film)
%, Thickness 30 μm) was applied and adhered by applying an adhesive coating liquid having the following composition so that the dry coating amount was 2 g / m ² . (Adhesive coating liquid) Takelac A-606 (Takeda Yakuhin, Polyurethane Polyol) 90 parts Takenate A-12 (Takeda Yakuhin, polyisocyanate) 10 parts Ethyl acetate 90 parts

Next, the antistatic layer coating liquid A having the following composition was applied on the back side porous film, and the antistatic layer coating liquid B having the following composition was applied on the front side porous film, each at a dry coating amount of 3
A support was prepared by coating so as to have g / m ² . (Antistatic layer coating liquid formulation A) PVA117 (Kuraray's polyvinyl alcohol) 50 parts Glyoxal 5 parts Saftomer STH165 (Mitsubishi Oil Chemical acrylic conductive agent) 45 parts Water 300 parts (Antistatic layer coating liquid formulation B) ADEKA COL CC9 ( Asahi Denka Co., Ltd., conductive agent) 65 parts Lamic F2205MC (Takeda Chemical Industries, titanium-containing polyurethane polyol) 30 parts Lamic B Heartner (Takeda Chemicals, isocyanate) 5 parts Toluene 400 parts

Further, Example 9 was formed on the antistatic layer on the front side.
The same barrier layer and image-receiving layer as those described above were provided to obtain a heat-sensitive transfer image-receiving sheet of Example 11.

Example 12 For thermal transfer of Example 12 in the same manner as in Example 11 except that the base paper of Example 11 was changed to Pearl Coat (basis weight: 90 g / m ² , coated paper manufactured by Mitsubishi Paper Mills). An image receiving sheet was obtained.

Example 13 A polyolefin resin coating layer made of a low density polyethylene resin having a density of 0.92 g / cm ³ was obtained by subjecting both surfaces of a pearl coat (basic weight 80 g / m ² , coated paper made by Mitsubishi Paper Mills) to corona discharge treatment. Was obtained in the same manner as in Example 11 except that a polyolefin resin-coated paper was prepared by coating the both sides with 12 g / m ² by the melt extrusion method to obtain an image-receiving sheet for thermal transfer of Example 13. It was

Comparative Example 10 Polyolefin resin-coated paper was mixed with pearl color (basis weight 13
An image receiving sheet for heat-sensitive transfer of Comparative Example 10 was obtained in the same manner as in Example 9 except that 0 g / m ² , fine paper made by Mitsubishi Paper Mills) was used.

Comparative Example 11 Polyolefin resin-coated paper was pearl coated (basis weight 12
An image receiving sheet for heat-sensitive transfer of Comparative Example 11 was obtained in the same manner as in Example 9 except that 0 g / m ² , coated paper manufactured by Mitsubishi Paper Mills) was used.

Comparative Example 12 Polyolefin resin coated paper was used as a diamond foil W900.
An image receiving sheet for thermal transfer of Comparative Example 12 was obtained in the same manner as in Example 9 except that (polyethylene terephthalate film made of diamond foil having a thickness of 100 μm) was used.

Comparative Example 13 An image-receiving sheet for thermal transfer of Comparative Example 13 was obtained in the same manner as in Example 11 except that the base paper was Diamond foil W900 (thickness: 80 μm, polyethylene foil terephthalate film made of Diamond foil).

Comparative Example 14 50% by weight of bleached hardwood sulfite pulp (LBSP)
And bleached softwood sulphite pulp (NBSP) 30% by weight and hardwood kraft pulp (LBKP) 20% by weight on a base paper (basis weight 160 g / m ² ) after super calendering, then corona discharge treatment on both sides, Density 0.
An antistatic layer was provided on both sides of a polyolefin resin-coated paper prepared by applying a polyolefin resin coating layer of 92 g / cm ³ of low-density polyethylene resin on both sides by melt extrusion so as to be 24 g / m ² on both sides. An image receiving sheet for heat-sensitive transfer of Comparative Example 14 was obtained in the same manner as in Example 9 except that the support was used.

Comparative Example 15 An image-receiving sheet for thermal transfer of Comparative Example 15 was obtained in the same manner as in Example 9 except that the porous film was attached to the back surface of the polyolefin resin-coated paper.

Comparative Example 16 An image-receiving sheet for thermal transfer of Comparative Example 16 was obtained in the same manner as in Example 9 except that the antistatic layer was not provided on the polyolefin resin coating layer on the back surface.

Comparative Example 17 An image-receiving sheet for thermal transfer of Comparative Example 17 was prepared in the same manner as in Example 9 except that the antistatic layer was not provided between the porous film and the barrier layer.

Comparative Example 18 Comparative Example 18 was carried out in the same manner as in Example 9 except that neither the antistatic layer on the polyolefin resin coating layer on the back surface nor the antistatic layer between the porous film and the barrier layer was provided. An image-receiving sheet for thermal transfer was produced.

Comparative Example 19 An image-receiving sheet for thermal transfer of Comparative Example 19 was prepared in the same manner as in Example 9 except that the barrier layer was not provided between the antistatic layer and the image-receiving layer on the porous film.

Comparative Example 20 Same as Example 9 except that neither the antistatic layer on the polyolefin resin coating layer on the back surface nor the antistatic layer on the porous film was provided, and the following image receiving layer coating liquid was used. Then, an image-receiving sheet for thermal transfer of Comparative Example 20 was produced. (Compounding with the image-receiving layer coating liquid) BYRON 200 (TOYOBO, polyester resin) 51 parts BYRON 290 (TOYOBO, polyester resin) 30 parts ADEKA COL CC9 (manufactured by Asahi Denka Co., Ltd., conductive agent) 4 parts MIBK-ST (manufactured by Nissan Kagaku, Colloidal silica) 13.5 parts SF8417 (Toray Red Corning Silicone, amino modified silicone oil) 1 part SF8411 (Toray Corning Silicone, epoxy modified silicone oil) 0.5 part Toluene 150 parts Methyl ethyl ketone 150 parts

Comparative Example 21 The antistatic layer on the polyolefin resin coating layer on the back surface and the antistatic layer on the porous film were not provided together, and the following image receiving layer and overlayer coating liquid were respectively applied in a dry coating amount of 4 .0g / m ^2, except that sequentially coated to a 1.0 g / m ^2, the same procedure as in example 9, to prepare a receiving sheet for thermal transfer of Comparative example 21. (Receptor layer coating liquid) BYRON 200 (Toyobo, polyester resin) 56.5 parts BYRON 290 (TOYOBO, polyester resin) 30 parts MIBK-ST (Nissan Chemical Co., Ltd., colloidal silica) 13.5 parts Toluene 150 parts Methyl ethyl ketone 150 parts (over) Layer coating liquid) ADEKA COL CC9 (Asahi Denka Kogyo, conductive agent) 4.5 parts SF8417 (Toray-Dow Corning Silicone, amino-modified silicone oil) 1 part SF8411 (Toray-Dow Corning Silicone, epoxy-modified silicone oil) 0.5 part Toluene 52 parts Ligroin 92 parts

The evaluation results of Examples 11 to 13 and Comparative Examples 10 to 21 are summarized in Tables 4 and 5.

[0108]

[Table 4]

[0109]

[Table 5]

(Evaluation) In the image-receiving sheets for heat-sensitive transfer according to the present invention of Examples 11 to 13, a base paper (fine paper), coated paper and polyolefin resin-coated paper were used, and porous films were adhered on both sides. Therefore, the curl characteristics were good, there were no white spots in the image, and the sensitivity and resistance to image bleeding were good. However, in the image-receiving sheet for heat-sensitive transfer of Comparative Example 11, since the porous film and the barrier layer were provided on one surface of the coated paper, plus curl could not be suppressed and the transportability in the printer was poor. . Comparative Example 12
Since the polyethylene terephthalate film is used in the heat-sensitive transfer image-receiving sheets of 13 and 13, the rigidity of the entire sheet is too high even if the porous film is attached on one side or both sides. The internal transportability was extremely poor. In the image-receiving sheet for heat-sensitive transfer of Comparative Example 14, since the porous film was not used, the sensitivity was remarkably lowered, and the white spots in the transferred image were severe. In the image-receiving sheet for heat-sensitive transfer of Comparative Example 15, the porous film is
Since it was adhered to the back surface opposite to the surface provided with the image receiving layer, the sensitivity was lowered, and further uneven density of the transferred image occurred due to uneven formation of the base paper of the polyolefin resin coated paper. In the image-receiving sheet for heat-sensitive transfer of Comparative Example 16, since the surface opposite to the image-receiving layer was not subjected to antistatic treatment, dust was adsorbed on the polyolefin resin coating layer to cause white spots in the image, and the curl characteristic was not good. It was In the image-receiving sheet for heat-sensitive transfer of Comparative Example 17, since the antistatic layer was not provided between the porous film and the barrier layer, dust was adsorbed on the image-receiving layer to cause white spots in the image, and the curling property was also bad. It was Since the image-receiving sheet for thermal transfer of Comparative Example 18 was not subjected to any antistatic treatment, white spots in the image were remarkable, and double-run paper feeding occurred during paper feeding of the printer. In the image-receiving sheet for heat-sensitive transfer of Comparative Example 19, the barrier layer was not provided, so the image bleeding resistance was remarkably inferior. In the heat-sensitive transfer image-receiving sheets of Comparative Examples 20 and 21, an antistatic agent is added to the image-receiving layer, or
Alternatively, since it is provided as an overlayer on the image receiving layer, image bleeding is remarkable and the curling characteristics are poor.

[0111]

The image-receiving sheet for heat-sensitive transfer of the present invention comprises a base film, a porous film, an antistatic layer, a barrier layer comprising a radiation-curable resin composition, and an image-receiving layer for receiving a dye from a thermal transfer medium. It is possible to obtain an image-receiving sheet for heat-sensitive transfer which has various constitutions in which the above are laminated, and which has good sensitivity, resistance to image bleeding and curl characteristics and excellent antistatic properties.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing an example of a heat-sensitive transfer image-receiving sheet of the present invention.

[Explanation of symbols]

 1 Base Paper 2 Polyolefin Resin Coated Paper 3 Porous Film 4 Antistatic Layer 5 Barrier Layer 6 Image Receiving Layer 7 Support

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiko Sunada 3-4 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Paper Mills, Ltd.

Claims (2)

[Claims] 1. A heat-sensitive transfer image-receiving sheet comprising a support and a barrier layer made of a radiation-curable resin composition and an image-receiving layer for receiving a heat transferable dye from a heat transfer medium. A porous film is attached to both sides of a polyolefin resin-coated paper, and a support provided with an antistatic layer on the porous film, or a porous film is attached to one side of the polyolefin resin-coated paper, the porous film Side and a porous film non-adhering side provided with an antistatic layer on the antistatic layer on one porous film adhering side of the support, at least one or more acryloyl equivalent of 150 to 280 radiation curable resin 10-50
% By weight, and the average acryloyl equivalent is 100 to 1
An image-receiving sheet for heat-sensitive transfer, comprising a barrier layer made of 90 radiation-curable resin composition and an image-receiving layer laminated thereon. 2. The acryloyl equivalent weight of 150 to 280.
2. The image-receiving sheet for heat-sensitive transfer according to claim 1, wherein at least one kind of the radiation-curable resin is a hydrophilic radiation-curable resin.