JP6790982B2 - Image receiving sheet for sublimation transfer - Google Patents

Description

The present invention relates to an image receiving sheet for sublimation transfer.

Generally, the thermal transfer recording medium is an ink ribbon called a so-called thermal ribbon used in a thermal transfer printer. This ink ribbon includes, for example, a base material, a thermal transfer layer containing ink provided on one surface of the base material, and a heat-resistant slipping layer (backcoat layer) provided on the other side of the base material. , Equipped with. In a thermal transfer printer, the heat generated by the thermal head is applied to the thermal transfer layer of the ink ribbon to sublimate (sublimate transfer method) or melt (melt transfer method) the ink contained in the thermal transfer layer, and the ink is subjected to thermal transfer image reception. It is transferred to a sheet, and a film made of ink is formed on the heat transfer image receiving sheet. Characters and images are formed on the heat transfer image receiving sheet by the film made of this ink.

Among thermal transfer printers, sublimation transfer printers can easily form various images in full color due to the advanced functionality of the printer, so self-printing of digital cameras, printing of cards such as identification cards, and output for amusement. It is widely used for printing things. With the diversification of such thermal transfer printers, there is a demand for miniaturization, high speed and low cost of printers, and durability of the obtained printed matter. In recent years, a recording medium for sublimation transfer in which a plurality of thermal transfer layers and a protective layer for imparting durability to a printed matter are provided on the same surface side of the base material so as not to overlap each other has become widespread.

Under such circumstances, with the diversification and widespread use of thermal transfer printers, an image receiving sheet for sublimation transfer that does not contain an organic solvent in the ink is required in consideration of the environment. Conventionally, the image receiving sheet for sublimation transfer has been coated with a resin dissolved in a solvent and used as a receiving layer, but recently it has been coated with an aqueous emulsion resin in order to reduce the burden on the environment. Is often used.
However, there is a problem that the release agent that can be used as a release agent is limited in the water-based emulsion coated product.

JP-A-2008-246777

However, when printing was performed with a high-speed printing printer in a high-temperature and high-humidity environment using the thermal transfer image receiving sheet described in Patent Document 1, the release agent was a fatty acid ester of a polyhydric alcohol, and thus silicone oil. The releasability was more insufficient, and fusion with the ribbon occurred.
The present invention has been made in view of the above problems, and an object of the present invention is to provide an image receiving sheet for sublimation transfer having high releasability in a high temperature and high humidity environment.

The present inventors have found that the above-mentioned problems can be achieved by supporting silicone oil used as a mold release agent for an ink receiving layer constituting an image receiving sheet for sublimation transfer on an inorganic filler and dispersing it in the receiving layer. The present invention has been completed.
In order to solve the above problems, the image receiving sheet for sublimation transfer according to one aspect of the present invention is provided with an ink receiving layer on at least one surface side of the base material, and the ink receiving layer is made of a water-soluble resin and an aqueous emulsion resin. It is characterized by containing a resin composed of at least one of them and inorganic fine particles in which silicone oil is supported by a silane coupling agent.

According to one aspect of the present invention, it is possible to provide an image receiving sheet for sublimation transfer having high releasability and no uneven color development in a high temperature and high humidity environment.

It is sectional drawing which shows typically the image-receiving sheet for sublimation transfer which concerns on embodiment of this invention.

An embodiment of the image receiving sheet for sublimation transfer of the present invention will be described.
It should be noted that the present embodiment is specifically described in order to better understand the gist of the invention, and is not limited to the present invention unless otherwise specified. In addition, the drawings are schematic, and the ratio of the thickness of each layer is different from the actual one.

[Image receiving sheet for sublimation transfer]
FIG. 1 is a cross-sectional view schematically showing an image receiving sheet for sublimation transfer according to an embodiment of the present invention.
The image receiving sheet 1 for sublimation transfer according to the present embodiment includes a base material 2, a heat insulating layer 3 and an ink receiving layer 4 which are sequentially laminated on one surface side of the base material 2.

(Base material)
The base material 2 is not particularly limited, and conventionally known ones are used. Examples of the base material 2 include a film made of synthetic resin, high-quality paper, medium-quality paper, coated paper, art paper, resin laminated paper, and the like. Examples of the synthetic resin include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyolefins such as polypropylene and polyethylene, polyvinyl chloride, polycarbonate, polyvinyl alcohol, polystyrene, polyamide and the like. As the base material 2, one kind of a film or paper made of these synthetic resins may be used alone, or two or more kinds of films or papers may be combined and used as a composite.
The thickness of the base material 2 is preferably 25 μm or more and 250 μm or less, and more preferably 50 μm or more and 200 μm or less.
When the thickness of the base material 2 is within the above range, the elasticity, strength and heat resistance required for the printed matter can be sufficiently obtained when the printed matter is formed.

(Insulation layer)
As the heat insulating layer 3, a conventionally known heat insulating layer can be used as long as it is a heat insulating layer including a porous layer.
When the porous layer is made of a foamed film, a heat insulating layer using a composite film having skin layers on one side or both sides of the film can be mentioned. As the heat insulating layer 3, it is preferable to use a composite film in which a skin layer is provided on one side or both sides of the foamed polyolefin film.
The resin constituting the heat insulating layer 3 may contain hollow particles to form a porous layer.

The hollow particles are not particularly limited to non-foaming type and foaming type, and conventionally known ones are used. Examples of the hollow particles include acrylic porous particles having a large number of fine cavities inside the particles, silica particles having a hollow structure (hollow silica), and effervescent acrylic particles containing hydrocarbons.
The average particle size of the unfoamed hollow particles is preferably 0.3 μm or more and 5.0 μm or less, and more preferably 0.5 μm or more and 2.0 μm or less. The average particle size of the hollow particles can be measured by a laser diffraction method using a particle size distribution measuring device.

The resin constituting the heat insulating layer 3 fills the gaps between the hollow particles constituting the heat insulating layer 3, binds the hollow particles to each other, and joins the base material 2 and the heat insulating layer 3.
The resin is not particularly limited, and conventionally known resins are used. Examples of the resin include gelatin, polyvinyl alcohol, polyvinylpyrrolidone, styrene-butadiene latex, acrylic, polyester and the like.
The mass ratio ((b) / (a)) of the hollow particles (a) to the resin (b) is preferably 50/50 to 2/98, and more preferably 70/30 to 95/5. preferable.

If the hollow particles (a) are blended so that the mass ratio ((b) / (a)) is 50/50 or more, sufficient heat insulating properties can be obtained in the heat insulating layer 3, and the base material 2 is heated during thermal transfer. Sufficient image quality can be obtained without deformation or melting. On the other hand, if the hollow particles (a) are blended so that the mass ratio ((b) / (a)) is 95/5 or less, sufficient strength can be obtained.
The thickness of the heat insulating layer 3 is preferably 5 μm or more and 100 μm or less, and more preferably 10 μm or more and 60 μm or less.
When the thickness of the heat insulating layer 3 is 5 μm or more, sufficient heat insulating properties can be obtained for the heat insulating layer 3. On the other hand, when the thickness of the heat insulating layer 3 is 100 μm or less, the elasticity required for the printed matter can be obtained when the printed matter is formed.

The density of the heat insulating layer 3 ^is preferably ^{0.15g / cm 3 ~0.85g / cm 3} , more preferably ^{0.3g / cm 3 ~0.7g / cm 3} .
When the density of the heat insulating layer 3 is 0.15 g / cm ³ or more, the content of hollow particles in the heat insulating layer 3 becomes too high, the cohesive force of the heat insulating layer 3 decreases, and the heat insulating layer 3 has a force with respect to the base material 2. Adhesion does not decrease, and the heat insulating layer 3 has sufficient heat insulating properties. On the other hand, when the density of the heat insulating layer 3 is 0.85 g / cm ³ or less, the heat insulating layer 3 appropriately contains hollow particles, so that the heat insulating layer 3 has sufficient heat insulating properties.
Although FIG. 1 illustrates a case where the heat insulating layer 3 is composed of one layer, the image receiving sheet 1 for sublimation transfer of the present embodiment is not limited to this. In the image receiving sheet 1 for sublimation transfer of the present embodiment, the heat insulating layer 3 may be composed of two or more layers having different types of hollow particles and mass ratios of the hollow particles and the resin.

(Ink receiving layer)
The ink receiving layer 4 receives the sublimation dye transferred from the heat transfer ink sheet at the time of image formation by heat transfer, and holds the received sublimation dye in the receiving layer to form and maintain an image on the surface of the receiving layer. can do.
The ink receiving layer 4 contains a binder resin, inorganic fine particles, and silicone oil supported on the inorganic fine particles. Specifically, the ink receiving layer contains a resin composed of at least one of a water-soluble resin and a water-based emulsion resin, inorganic fine particles in which silicone oil is supported by a silane coupling agent, and a binder resin.
As a result, the ink receiving layer 4 contains a surfactant and the like according to various purposes.
Examples of the water-soluble resin include, but are not limited to, water-soluble polyester and water-soluble acrylic resin.

Examples of the aqueous emulsion resin include acrylic resins, vinyl chloride resins, polyolefin resins such as polyethylene and polypropylene, polyvinyl chloride, vinyl chloride / vinyl acetate copolymers (vinyl chloride resin), and halogens such as polyvinylidene chloride. Chemicalized polymer, polyvinyl acetate / acrylic copolymer, vinyl polymer such as polyvinyl chloride ester, polystyrene resin, polyamide resin, copolymer resin of olefin such as ethylene and propylene and other vinyl monomer, ionomer, cellulose Examples thereof include cellulose-based resins such as diacetate, polycarbonates and the like, and mixed systems of these resins, preferably vinyl chloride-based resins. Among the vinyl chloride meter resins, at least one kind of vinyl chloride resin selected from vinyl chloride / vinyl acetate copolymer and vinyl chloride / acrylic copolymer is more preferable.

The ink receiving layer 4 may also contain a curing agent. The curing agent is preferably an isocyanate-based curing agent. Examples of the isocyanate-based curing agent include polyisocyanates, and conventionally known ones can be used. As the polyisocyanate, both a block type and a non-block type can be used, but the non-block type is preferable because of the ease of curing reaction.
The content of the polyisocyanate is preferably 0.3 times equivalent or more and 1.5 times equivalent or less with respect to the acid value of the binder resin. If the amount is less than 0.3 equivalent, there is a risk that a sufficient addition effect cannot be obtained. Further, when the equivalent is larger than 1.5 times, the releasability is improved, but there is a high possibility that transfer failure or concentration decrease of the overcoat layer will occur.

Silicone oils include amino-modified silicone, alcohol-modified silicone, vinyl-modified silicone, urethane-modified silicone, epoxy-modified silicone, polyester-modified silicone, polyether-modified silicone, polyester-modified silicone, acrylic-modified silicone, aralkyl-modified silicone, and amide-modified silicone. Silicone oil can be mentioned. As the silicone oil, these may be mixed or polymerized by using various reactions.
The amount of the silicone oil added is preferably in the range of 0.3% by mass or more and 10% by mass or less, particularly 1% by mass or more and 5% by mass or less with respect to the ink receiving layer binder resin. If the amount added is too large, the friction coefficient of the surface will decrease and wrinkles will easily occur, and if the amount added too much, the releasability will decrease, resulting in transfer and jamming of the color layer due to sticking to the ribbon. This is because

As described above, the silicone oil is added to the ink receiving layer 4 in a state of being supported on the inorganic fine particles. At this time, the silicone oil and the surface of the inorganic fine particles are bonded with a silane coupling agent to make it easier to support.
Examples of the inorganic fine particles include, but are not limited to, silica fine particles (coroidal silica, fumed silica, etc., regardless of manufacturing method), alumina fine particles, and the like. The particle size of the inorganic fine particles is preferably 2 μm or less as the secondary particles and 500 nm or less as the primary particles.
The amount of the inorganic fine particles added is preferably in the range of 0.05% by mass or more and 10% by mass or less, particularly preferably in the range of 1% by mass or more and 3% by mass or less with respect to the ink receiving layer binder resin. This is because if the amount added is small, the silicone oil cannot be sufficiently supported, and if the amount added is large, the printing screen becomes rough and the image quality deteriorates.

The thickness of the ink receiving layer 4 is preferably 0.1 μm or more and 10 μm or less, and more preferably 0.2 μm or more and 8 μm or less.
When the thickness of the ink receiving layer 4 is 0.1 μm or more, sufficient mechanical strength can be obtained for the ink receiving layer 4, so that poor image quality is less likely to occur. On the other hand, if the thickness of the ink receiving layer 4 is 10 μm or less, the cost merit is large.
Here, in the sublimation transfer image receiving sheet 1 of the present embodiment, an adhesive layer may be provided between the base material 2 and the heat insulating layer 3 in order to improve the adhesiveness between the base material 2 and the heat insulating layer 3.

The material for forming the adhesive layer is not particularly limited, and conventionally known materials are used. Examples of the material for forming the adhesive layer include polyolefin resins such as polyethylene, urethane resins, acrylic resins, polyester resins, and resins. Among these, urethane-based resin and acrylic-based resin are preferable.
Further, the sublimation transfer image receiving sheet 1 is provided with a back surface layer on the surface (the other surface) 2b opposite to the surface (one surface 2a) on which the ink receiving layer 4 is provided on the base material 2. You may.
This back surface layer is provided for improving printer transportability, preventing blocking with the ink receiving layer 4, and preventing curling of the image receiving sheet 1 for sublimation transfer before and after printing.

The material for forming the back surface layer is not particularly limited, and conventionally known materials are used. Examples of the material forming the back surface layer include polyolefin resins such as polyethylene resin and polypropylene resin, acrylic resins, polycarbonate resins, polyvinyl alcohol resins, polyvinyl acetal resins, polyester resins, polystyrene resins, and binder resins such as polyamide. And so on.
Further, a known additive such as a filler or an antistatic agent may be added to the material forming the back surface layer, if necessary.
Further, the sublimation transfer image receiving sheet 1 may be provided with an undercoat layer between the heat insulating layer 3 and the ink receiving layer 4 as long as the performance of the sublimation transfer image receiving sheet 1 of the present embodiment is not impaired. ..

The thickness of the undercoat layer is preferably 0.1 μm or more and 6 μm or less, and more preferably 0.2 μm or more and 5 μm or less.
When the thickness of the undercoat layer is 0.1 μm or more, not only the film thickness of the undercoat layer can be easily adjusted, but also the print density is unlikely to vary. Further, the adhesion between the undercoat layer, the heat insulating layer 3 and the ink receiving layer 4 becomes sufficient. On the other hand, when the thickness of the undercoat layer is 6 μm or less, the printing density at the time of high-speed printing does not decrease. Further, from the viewpoint of cost, the thickness of the undercoat layer is preferably 6 μm or less.
As the resin used for the undercoat layer, conventionally known resins can be used, and examples thereof include gelatin, polyvinyl alcohol, acrylic, polyester, styrene-butadiene latex, and polyvinylpyrrolidone.

[effect]
According to the image receiving sheet 1 for sublimation transfer of the present embodiment, since the ink receiving layer 4 contains inorganic fine particles carrying silicone oil, stable releasability can be obtained in a high temperature and high humidity environment.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.
The term "part" in the text is based on mass unless otherwise specified.

[Example 1]
A high-quality paper having a thickness of 140 μm was used as a base material, and a first polyethylene resin layer having a thickness of 30 μm was formed on one surface of the paper by a melt extrusion method. Further, a second polyethylene resin layer having a thickness of 40 μm was formed on the other surface of the woodfree paper by a melt extrusion method.
Next, a heat insulating layer coating liquid having the following composition is applied onto the second polyethylene resin layer so that the thickness after drying is 20 μm to form a coating film, and the coating film is dried. As a result, a heat insulating layer was formed.

"Composition of heat insulating layer coating liquid"
The composition of the heat insulating layer coating liquid is as follows.
-Hollow particles (styrene acrylic, particle size 0.3 μm, solid content 30% by mass): 90.0 parts by mass-Polyvinyl alcohol (trade name: PVA-117, manufactured by Kuraray): 10.0 parts by mass Then, a heat insulating layer An ink receiving layer coating solution-1 having the following composition is applied onto the above so that the thickness after drying is 3 μm to form a coating film, and the coating film is dried to form an ink receiving layer. It was formed to obtain an image receiving sheet for sublimation transfer of Example 1.
Here, the ink receiving layer coating liquid-1 contains the silicone oil-supported inorganic fine particles-1 having the following composition.

"Composition of Silicone Oil-Supported Inorganic Fine Particles-1"
The composition of the silicone oil-supported inorganic fine particles-1 is as follows.
-Silicone oil (trade name: KF-8004, manufactured by Shin-Etsu Chemical Co., Ltd.): 60.0 parts by mass-Silane coupling agent (trade name: KBM-9569, manufactured by Shin-Etsu Chemical Co., Ltd.): 10.0 parts by mass-hydrophobic Dry Silane: 30 parts by mass The above material was stirred at room temperature for 2 hours to obtain silicone oil-supported inorganic fine particles-1.

"Composition of Ink Receiving Layer Coating Solution-1"
The composition of the ink receiving layer coating liquid-1 is as follows.
-Vinyl chloride-acrylic acid ester copolymer (trade name: Vinibran 690, manufactured by Nissin Chemical Co., Ltd.): 55.6 parts by mass-Polyisocyanate (trade name: DNW-6000, manufactured by DIC): 1.65 mass Parts-Silicone oil-supported inorganic fine particles-1: 1.05 parts by mass-Pure water: 41.75 parts by mass

[Example 2]
An image receiving sheet for sublimation transfer of Example 2 was obtained in the same manner as in Example 1 except that the ink receiving layer was formed using the ink receiving layer coating liquid-2 having the following composition.

"Composition of Ink Receiving Layer Coating Solution-2"
The composition of the ink receiving layer coating liquid-2 is as follows.
-Vinyl chloride-acrylic acid ester copolymer (trade name: Vinibran 690, manufactured by Nisshin Kagaku Kogyo Co., Ltd.): 55.6 parts by mass-Silicone oil-supported inorganic fine particles-1: 2.22 parts by mass-Pure water: 42. 22 parts by mass

[Example 3]
An image receiving sheet for sublimation transfer of Example 3 was obtained in the same manner as in Example 1 except that the ink receiving layer was formed using the ink receiving layer coating liquid-3 having the following composition.
Here, the ink receiving layer coating liquid-3 contains the silicone oil-supported inorganic fine particles-2 having the following composition.

"Composition of Silicone Oil-Supported Inorganic Fine Particles-2"
The composition of the silicone oil-supported inorganic fine particles-2 is as follows.
-Silicone oil (trade name: KF-8002, manufactured by Shin-Etsu Chemical Co., Ltd.): 60.0 parts by mass-Silane coupling agent (trade name: KBM-9569, manufactured by Shin-Etsu Chemical Co., Ltd.): 10.0 parts by mass-hydrophobic Dry Silane: 30 parts by mass The above material was stirred at room temperature for 2 hours to obtain silicone oil-supported inorganic fine particles-2.

"Composition of Ink Receiving Layer Coating Solution-3"
The composition of the ink receiving layer coating liquid-3 is as follows.
-Vinyl chloride-acrylic acid ester copolymer (trade name: Vinibran 690, manufactured by Nissin Chemical Co., Ltd.): 55.6 parts by mass-Polyisocyanate (trade name: DNW-6000, manufactured by DIC): 1.65 mass Parts ・ Silicone oil-supported inorganic fine particles-2: 1.05 parts by mass ・ Pure water: 41.75 parts by mass

[Example 4]
An image receiving sheet for sublimation transfer of Example 4 was obtained in the same manner as in Example 1 except that the ink receiving layer was formed using the ink receiving layer coating liquid-4 having the following composition.
Here, the ink receiving layer coating liquid-4 contains the silicone oil-supported inorganic fine particles-3 having the following composition.

"Composition of Silicone Oil-Supported Inorganic Fine Particles-3"
The composition of the silicone oil-supported inorganic fine particles-3 is as follows.
-Silicone oil (trade name: KF-861, manufactured by Shin-Etsu Chemical Co., Ltd.): 60.0 parts by mass-Silane coupling agent (trade name: KBM-9695, manufactured by Shin-Etsu Chemical Co., Ltd.): 10.0 parts by mass-hydrophobic Dry Silane: 30 parts by mass The above material was stirred at room temperature for 2 hours to obtain silicone oil-supported inorganic fine particles-3.

"Ink receiving layer coating liquid-4"
The composition of the ink receiving layer coating liquid-4 is as follows.
-Vinyl chloride-acrylic acid ester copolymer (trade name: Vinibran 690, manufactured by Nissin Chemical Co., Ltd.): 55.6 parts by mass-Polyisocyanate (trade name: DNW-6000, manufactured by DIC): 1.65 mass Parts ・ Inorganic fine particles carrying silicone oil-3: 1.05 parts by mass ・ Pure water: 41.75 parts by mass

[Example 5]
An image receiving sheet for sublimation transfer of Example 5 was obtained in the same manner as in Example 1 except that the ink receiving layer was formed using the ink receiving layer coating liquid-5 having the following composition.
Here, the ink receiving layer coating liquid-5 contains the silicone oil-supported inorganic fine particles-4 having the following composition.

"Composition of Silicone Oil-Supported Inorganic Fine Particles-4"
The composition of the silicone oil-supported inorganic fine particles-4 is as follows.
-Silicone oil (trade name: X-22-3939A, manufactured by Shin-Etsu Chemical Co., Ltd.): 60.0 parts by mass-Silane coupling agent (trade name: KBM-9569, manufactured by Shin-Etsu Chemical Co., Ltd.): 10.0 parts by mass -Hydrophobic dry silica: 30 parts by mass The above material was stirred at room temperature for 2 hours to obtain silicone oil-supported inorganic fine particles-4.

"Composition of Ink Receiving Layer Coating Solution-5"
The composition of the ink receiving layer coating liquid-5 is as follows.
-Vinyl chloride-acrylic acid ester copolymer (trade name: Vinibran 690, manufactured by Nissin Chemical Co., Ltd.): 55.6 parts by mass-Polyisocyanate (trade name: DNW-6000, manufactured by DIC): 1.65 mass Parts ・ Inorganic fine particles carrying silicone oil-4: 1.05 parts by mass ・ Pure water: 41.75 parts by mass

[Comparative Example 1]
An image receiving sheet for sublimation transfer of Comparative Example 1 was obtained in the same manner as in Example 1 except that the ink receiving layer was formed by using the ink receiving layer coating liquid-6 having the following composition.

"Composition of Ink Receiving Layer Coating Solution-6"
The composition of the ink receiving layer coating liquid-6 is as follows.
-Vinyl chloride-acrylic acid ester copolymer (trade name: Vinibran 690, manufactured by Nisshin Chemical Industry Co., Ltd.): 55.6 parts by mass-Polyisocyanate (trade name: DNW-6000, manufactured by DIC): 1.65 mass Parts ・ Silicone oil (trade name: KF-8004, manufactured by Shin-Etsu Chemical Co., Ltd.): 1.05 parts by mass ・ Pure water: 41.75 parts by mass

[Comparative Example 2]
An image receiving sheet for sublimation transfer of Comparative Example 2 was obtained in the same manner as in Example 1 except that the ink receiving layer was formed by using the ink receiving layer coating liquid-7 having the following composition.

"Composition of Ink Receiving Layer Coating Solution-7"
The composition of the ink receiving layer coating liquid-7 is as follows.
-Vinyl chloride-acrylic acid ester copolymer (trade name: Vinibran 690, manufactured by Nisshin Chemical Industry Co., Ltd.): 55.6 parts by mass-Polyisocyanate (trade name: DNW-6000, manufactured by DIC): 1.65 mass Parts ・ Silicone oil (trade name: KF-8004, manufactured by Shin-Etsu Chemical Co., Ltd.): 0.75 parts by mass ・ Hydrophobic dry silica: 0.30 parts by mass ・ Pure water: 41.75 parts by mass

[Comparative Example 3]
An image receiving sheet for sublimation transfer of Comparative Example 3 was obtained in the same manner as in Example 1 except that the ink receiving layer was formed using the ink receiving layer coating liquid-8 having the following composition.

"Composition of Ink Receiving Layer Coating Solution-8"
The composition of the ink receiving layer coating liquid-8 is as follows.
-Vinyl chloride-acrylic acid ester copolymer (trade name: Vinibran 690, manufactured by Nisshin Chemical Industry Co., Ltd.): 55.6 parts by mass-Polyisocyanate (trade name: DNW-6000, manufactured by DIC): 1.65 mass Parts ・ Silicone oil (trade name: KF-8002, manufactured by Shin-Etsu Chemical Co., Ltd.): 0.75 parts by mass ・ Hydrophobic dry silica: 0.30 parts by mass ・ Pure water: 41.75 parts by mass

[Comparative Example 4]
An image receiving sheet for sublimation transfer of Comparative Example 4 was obtained in the same manner as in Example 1 except that the ink receiving layer was formed by using the ink receiving layer coating liquid-9 having the following composition.

"Composition of Ink Receiving Layer Coating Solution-9"
The composition of the ink receiving layer coating liquid-9 is as follows.
-Vinyl chloride-acrylic acid ester copolymer (trade name: Vinibran 690, manufactured by Nisshin Chemical Industry Co., Ltd.): 55.6 parts by mass-Polyisocyanate (trade name: DNW-6000, manufactured by DIC): 1.65 mass Parts ・ Silicone oil (trade name: KF-861, manufactured by Shin-Etsu Chemical Co., Ltd.): 0.75 parts by mass ・ Hydrophobic dry silica: 0.30 parts by mass ・ Pure water: 41.75 parts by mass

[Comparative Example 5]
An image receiving sheet for sublimation transfer of Comparative Example 5 was obtained in the same manner as in Example 1 except that the ink receiving layer was formed using the ink receiving layer coating liquid-10 having the following composition.

"Composition of Ink Receiving Layer Coating Solution-10"
The composition of the ink receiving layer coating liquid-10 is as follows.
-Vinyl chloride-acrylic acid ester copolymer (trade name: Vinibran 690, manufactured by Nisshin Chemical Industry Co., Ltd.): 55.6 parts by mass-Polyisocyanate (trade name: DNW-6000, manufactured by DIC): 1.65 mass Parts ・ Silicone oil (trade name: X-22-3939A, manufactured by Shin-Etsu Chemical Co., Ltd.): 0.75 parts by mass ・ Hydrophobic dry silica: 0.30 parts by mass ・ Pure water: 41.75 parts by mass

[Preparation of thermal transfer recording medium]
As the base material of the thermal transfer recording medium, a polyethylene terephthalate film with a single-sided easy-adhesion treatment having a thickness of 4.5 μm is used, and a heat-resistant slip layer coating liquid having the following composition is applied to the non-easy-adhesion-treated surface, and the amount of application after drying is large. It was applied and dried to a concentration of 1.0 g / m ² to obtain a base material with a heat-resistant slippery layer.
Next, a thermal transfer layer coating solution having the following composition is applied to the easily adhesive-treated surface of the base material with a heat-resistant slipping layer so that the coating amount after drying is 1.0 g / m ^2, and the thermal transfer layer is dried. Was formed to obtain a thermal transfer recording medium.

"Composition of heat-resistant slip layer coating liquid"
The composition of the heat-resistant slip layer coating liquid is as follows.
-Silicone acrylic graft polymer (trade name: US-350, manufactured by Toagosei Co., Ltd.): 50.0 parts by mass-Methyl ethyl ketone: 50.0 parts by mass

"Composition of thermal transfer layer coating liquid"
The composition of the thermal transfer layer coating liquid is as follows.
・ C. I. Solvent Blue 36: 2.5 parts by mass ・ C.I. I. Solvent Blue 63: 2.5 parts by mass ・ Polyvinyl acetal resin: 5.0 parts by mass ・ Toluene: 45.0 parts by mass ・ Methyl ethyl ketone: 45.0 parts by mass

"Print evaluation"
(1) Releasability Evaluation Using the above thermal transfer recording medium, an example using an evaluation thermal printer having a printing speed of 1.5 msec / line and a resolution of 300 × 300 DPI in an environment of 40 ° C. and 80% humidity. Ten consecutive black solid image prints were performed on each of the sublimation transfer image receiving sheets 1 to 5 and Comparative Examples 1 to 5 to evaluate the releasability.
The releasability was evaluated according to the following criteria. The results are shown in Table 1.
Evaluation criteria ◎: No sticking, no peeling sound is seen ○: No sticking, very slight peeling sound △: No sticking, but peeling sound is confirmed ×: Sticking

(2) Evaluation of Color Development Example 1 using the above thermal transfer recording medium with an evaluation thermal printer having a printing speed of 1.5 msec / line and a resolution of 300 × 300 DPI in an environment of 25 ° C. and 50% humidity. Half-solid images were printed on each of the image receiving sheets for sublimation transfer of ~ 5 and Comparative Examples 1 to 5.
The color development was evaluated according to the following criteria. The results are shown in Table 1.
Evaluation Criteria ◎: Uniform color development without color development ○: Slight color development unevenness, but no problem in image quality ×: Color development unevenness

From the results in Table 1, it was found that the image receiving sheet for sublimation transfer, in which silicone oil was added to the ink receiving layers of Examples 1 to 5 in the form of being supported on inorganic fine particles, had excellent releasability and did not cause uneven color development.
From Examples 1 and 2, it was found that the releasability was superior when the curing agent was added to the ink receiving layer.
On the other hand, in Comparative Examples 1 to 4, since the silicone oil did not fit in the water-based coating liquid and was scattered in a sea-island shape, stable releasability could not be obtained and the color development characteristics became uneven. It turned out that it would end up.
In Comparative Example 5, since the silicone oil had high polarity, the dispersion in the aqueous solution was improved, but the releasability and color development characteristics were inferior to those supported on the inorganic fine particles.

The image receiving sheet for sublimation transfer of the present invention can be applied to a sublimation transfer type printer, and various images can be easily formed in full color in addition to high speed and high functionality of the printer. Therefore, self-printing and identification of a digital camera It can be widely used for cards such as certificates and output materials for amusement.

1 ... Image receiving sheet for sublimation transfer 2 ... Base material 3 ... Insulation layer 4 ... Ink receiving layer

Claims (3)

An ink receiving layer is provided on at least one surface side of the base material.
An image receiving sheet for sublimation transfer, wherein the ink receiving layer contains a resin composed of at least one of a water-soluble resin and an aqueous emulsion resin, and inorganic fine particles in which silicone oil is supported by a silane coupling agent. The image receiving sheet for sublimation transfer according to claim 1, wherein the ink receiving layer contains a curing agent. The image receiving sheet for sublimation transfer according to claim 2, wherein the curing agent is an isocyanate-based curing agent.

Images