JPH08156434A - Image transfer sheet - Google Patents

Abstract

PURPOSE: To improve the printing quality of printing image and contrive to improve the peeling performance of the printing image at the re-transferring of the printing image by a method wherein surface energy is controlled by providing a silicone resin layer on a surface, onto which the printing image is heat-transferred. CONSTITUTION: By a heat transferring system, a heat fusible ink layer 18 is transferred from a heat transfer recording medium 16 to a printing image transferring sheet 10 so as to form a heat transfer printing image 20 on the silicone resin layer 11 provided on the surface of the printing image transferring sheet 10. Next, the surface of the self-adhesive layer 24 of a transparent film 22 having the self-adhesive layer 24 thereon is pasted to the surface of the silicone resin layer 11 formed on the surface of the printing image transferring sheet 10 so as to re-transfer the printing image 20 on the silicone resin layer 11 provided on the surface of the printing image transferring sheet 10. Then, after being peeled off from the printing image transferring sheet 10, the peeled-off transparent film 22 is pasted to the desired article so as to allow to form the printing image on the surface of the article.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image transfer sheet for retransferring an image thermally transferred by a thermal transfer recording system to a film having a pressure-sensitive adhesive layer. The present invention relates to an image transfer sheet which can be transferred cleanly and can be easily peeled off with a film having an adhesive layer. The film having the pressure-sensitive adhesive layer having an image retransferred from the image transfer sheet of the present invention can be attached to the surface of a desired article as a label or a heading.

[0002]

2. Description of the Related Art A method of forming a thermal transfer print image on a transfer target such as paper or a plastic film having an adhesive layer on the back side by a thermal transfer recording method using a thermal transfer recording medium is a well known technique. . For example, when a label for a back cover of a document file is created using the image obtained by such a method, the portion of the transfer target on which the image is formed is cut out and the back cover is printed. I was pasting it.

However, in the label obtained by such a method, since the printed image is exposed on the surface of the transferred material, the printed image may be scratched by contact with other articles, or in some cases. In some cases, blocking may occur due to contact with another article, and the printed image may be transferred to the other article. Further, when the transfer target is not transparent, the background color or pattern of the article to which the label or the like is attached is covered with the label, and the appearance is impaired. Further, since such a method cuts out and uses an image portion, unnecessary portions must be discarded, which is inefficient and uneconomical.

In order to solve such a drawback, Japanese Patent Laid-Open No. 1-
In Japanese Patent Laid-Open No. 215580, a thermal transfer method is used to selectively transfer an ink layer of a recording medium to a non-ink-adsorbing transfer material to form a printed image, and then an adhesive layer is formed on the printed image of the transfer material. There has been proposed a method for forming an image by attaching a transparent film having the above, retransferring the image to the pressure-sensitive adhesive layer of the transparent film, and then attaching the transparent film to an object.

Such an image forming method has an advantage that an adhesive label can be easily prepared without any special operation, and the image is covered with a transparent film so that it has excellent scratch resistance. Furthermore, since a commercially available transparent adhesive tape or the like can be used as the film having the adhesive layer, it is suitable for personal use such as at home or office.

[0006]

However, in the image forming method described in JP-A 1-215580, the image is transferred from the thermal transfer recording medium such as an ink ribbon onto the transfer target. In this case, if the fixing property between the ink and the transfer target is weak, the problem occurs that the ink is not transferred to the surface of the transfer target and sufficient printing quality cannot be obtained. On the contrary, the fixing property between the ink and the transfer target is strong. If it is too much, there is a problem that the printed image on the transferred material is not transferred to the adhesive layer of the transparent film.

Therefore, the present invention provides a print transfer sheet for retransferring a print image thermally transferred from a heat transfer recording medium by a heat transfer system to a surface of the pressure-sensitive adhesive layer of a transparent or matte film having a pressure-sensitive adhesive layer. For transfer of an image having excellent print quality of an image transferred from a recording medium to an image transfer sheet and improved peeling performance of the image when retransferring the image transferred on the image transfer sheet. The purpose is to provide a sheet.

[0008]

Means for Solving the Problems As a result of intensive studies by the present inventors, the above-mentioned object was achieved by providing a specific layer on the surface of a printed image transfer sheet on which the printed image is thermally transferred to control the surface energy. It was found that

The present invention has been made based on the above findings, and reprints an image thermally transferred from a thermal transfer recording medium by a thermal transfer system onto the surface of the adhesive layer of a transparent or matte film having an adhesive layer. It is intended to provide a print image transfer sheet, which is characterized in that a silicone resin layer is provided on a surface of the print image transfer sheet on which the print image is thermally transferred.

[0010]

In the image transfer sheet of the present invention, the surface energy of the image transfer sheet is controlled by providing a silicone resin layer on the surface on which the image is thermally transferred. As a result, while maintaining the print quality of the printed image, the peeling property when retransferring the printed image is improved.

Hereinafter, the image transfer sheet of the present invention will be described in more detail.

As described above, the printed image transfer sheet of the present invention is provided with the silicone resin layer on the surface on which the printed image is thermally transferred from the thermal transfer recording medium. The silicone resin layer is not particularly limited, and examples thereof include condensation reaction type silicone resin used for release paper, addition reaction type silicone resin, ultraviolet ray curing type silicone resin and electron beam curing type silicone resin. .

The condensation reaction type silicone resin is obtained by subjecting silanol functional long-chain dimethylpolysiloxane at both terminals to methylhydrogenpolysiloxane or methylmethoxypolysiloxane to condensation reaction by heating in the presence of an organotin catalyst. is there.

In the addition reaction type silicone resin, a linear methylvinylpolysiloxane having vinyl groups at both ends and / or chains and methylhydrogenpolysiloxane are subjected to an addition reaction by heating in the presence of a platinum catalyst. It is a thing.

The above UV-curable silicone resin is 20
It is cured by the energy of ultraviolet rays of 0 to 400 nm, and examples of the ultraviolet curable silicone resin include acrylic silicone type resin, mercapto-vinyl addition polymerization type resin, addition reaction type resin and cationic polymerization type resin. It can be different. The acrylic silicone type resin is obtained by curing silicone having an acrylic group with ultraviolet energy using a photopolymerization initiator. The above-mentioned mercapto-vinyl addition polymerization type resin is obtained by curing siloxane containing a mercapto group and an unsaturated double bond with ultraviolet energy using a photopolymerization initiator. The addition reaction type resin is obtained by curing silicone with ultraviolet energy using a platinum catalyst. The above cationic polymerization type resin is obtained by curing siloxane having an epoxy group with ultraviolet energy using an onium salt catalyst.

The electron beam-curable silicone is obtained by curing a silicone containing a radical-polymerizable group such as an acrylic group with an electron beam. In the present invention, it is preferable to use a condensation reaction type silicone resin or an addition reaction type silicone resin, particularly an addition reaction type silicone resin, from the viewpoint of easy control of the peeling force and blocking resistance.

The method for forming the above silicone resin layer is not particularly limited, and examples thereof include a direct gravure coater, a Mayer bar coater, an air knife coater,
Using an offset gravure coater and a multi-stage roll coater, etc., on a base material described later, as in Examples described later, apply a silicone solution such as the above silicone prepared by adding a catalyst in advance, and cure, The silicone resin layer can be formed.

The thickness of the silicone resin layer thus formed is not particularly limited, but generally 0.001 to
The thickness is preferably 10 μm, particularly 0.01 to 1 μm
It is preferred that The thickness of the silicone resin layer is 0.
If it is less than 001 μm, sufficient releasability cannot be obtained, and if the thickness of the silicone resin layer exceeds 10 μm, problems such as incomplete curing reaction may occur, so the above range is preferable. .

The print quality of an image printed from the thermal transfer recording medium onto the image transfer sheet and the peeling performance of the image by the film having the pressure-sensitive adhesive layer are particularly determined by the silicone resin formed on the surface of the image transfer sheet. It can be controlled by balancing the surface energy of the layer and the center line average roughness of the image transfer sheet described later. In particular, the silicone resin layer largely contributes to the peeling performance as described above. In order to further improve the peeling performance, it is preferable to use a silicone resin layer having a contact angle to water of 90 ° or more when the silicone resin layer is applied to, for example, a smooth PET film, and more preferably Uses a silicone resin layer having a contact angle in the range of 90 to 120 °.

The center line average roughness (Ra) of the image transfer sheet of the present invention is preferably 0.05 to 1.5 μm, more preferably 0.2 to 0.9 μm.
If the surface roughness is less than 0.05 μm, the transfer of the printed image will be insufficient, and if the surface roughness exceeds 1.5 μm, the film having the pressure-sensitive adhesive layer may not be peeled off.
It is preferably within the above range. In the present invention, the center line average roughness (Ra) is in accordance with the definition of JIS B0601 (definition and display of surface roughness).
(Stylus-type surface roughness measuring device) A value measured by a measuring device conforming to the standard. The larger the center line average roughness, the rougher the surface.

The method for producing a sheet having a center line average roughness of 0.05 to 1.5 μm is not particularly limited, but, for example, a film as a base material of the image transfer sheet of the present invention may be sand or the like. Examples thereof include a method of spraying fine particles to physically roughen the surface, a method of roughening the surface with a chemical agent, and a method of kneading silica, titanium oxide or the like when forming the above-mentioned substrate. Further, the center line average roughness can be set within the above-described preferable range by appropriately adjusting the thickness of the silicone resin layer.

The image transfer sheet of the present invention comprises a base material and the above-mentioned silicone resin layer provided on the base material. The material of the base material is not particularly limited, and is a film sheet. Any material that can form a can be used. For example, polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate; polyamides such as nylon; polyimides; chlorinated resins such as polyvinyl chloride and polyvinylidene chloride; polystyrene and its derivatives. Examples thereof include polystyrenes; fluorine-based resins such as polytetrafluoroethylene; polycarbonates; papers such as glassine paper and condenser paper; and metal foils. Further, a blended product obtained by appropriately blending these materials, or a laminated product of sheets formed from these materials can also be used. In the present invention, a sheet made of polyethylene terephthalate, which is particularly firm and less likely to wrinkle and has excellent heat resistance, can be preferably used.

The thickness of the above-mentioned substrate is not particularly limited, but it is generally preferably 10 to 300 μm, particularly 50 to 300 μm.
It is preferably 150 μm. When the thickness of the base material is within this range, printing can be performed particularly easily with a commercially available word processor, and when peeling with a film having an adhesive layer, wrinkles do not occur and handling is particularly easy.

Next, an image forming method using the image transfer sheet of the present invention will be described. To form an image using the image transfer sheet of the present invention, first, as shown in FIG. 1, a heat source 12 such as a thermal head composed of an array of heating resistance elements and a platen roll 14 are provided. The heat-meltable ink layer 18 is transferred from the thermal transfer recording medium 16 to the image transfer sheet 10 by the thermal transfer method through the image transfer sheet 10 and the thermal transfer recording medium 16 of the present invention, and the surface of the image transfer sheet 10 is transferred. A thermal transfer printing image 20 is formed on the silicone resin layer 11.

Next, as shown in FIG. 2, the adhesive layer 24
The surface of the pressure-sensitive adhesive layer 24 of the transparent film 22 having the is attached to the silicone resin layer surface 11 of the image transfer sheet 10 on which the image 20 is formed, and the silicone resin layer on the surface of the image transfer sheet 10 is attached. The printed image 20 on 11 is retransferred to the adhesive layer 22. At this time, the transfer of the printed image 20 can be reliably performed by applying pressure by performing an operation such as rubbing the printed image portion from the transparent sheet side.

Then, as shown in FIG. 3, the transparent film 22 is peeled off from the image transfer sheet 10, and the peeled transparent film 22 is attached to a desired article to print an image on the surface of the article. Is formed.

Next, a thermal transfer recording medium for forming a thermal transfer image on the image transfer sheet of the present invention will be described. The thermal transfer recording medium is not particularly limited and, for example, a thermal transfer recording medium provided with a heat-meltable ink layer on a substrate can be used. Specifically, ink ribbons used in word processors, typewriters, printers, etc. can be used.

As the above-mentioned base material, a base material having heat resistance, high dimensional stability and high surface smoothness is preferable, and more specifically, condenser paper or glassine which has been mainly used as a base film of a thermal transfer recording medium from the past. In addition to papers such as paper and synthetic paper and polyethylene terephthalate, thin film sheets and films of resin films such as polycarbonate, polyethylene, polystyrene, polypropylene, polyimide and polyamide are used. The thickness of the substrate is not particularly limited, but a range of about 1.5 to 20 μm is suitable. Further, when recording is performed using a thermal head or the like, in order to improve heat resistance and runnability on the side of the base material in contact with the head, a silicone-based or fluorine-based compound, a resin layer, a crosslinked polymer layer, a metal layer, etc. May be provided.

The hot melt ink layer contains a heat melt resin and a coloring material. As the heat-meltable resin, a thermoplastic resin that melts or softens in the range of 40 to 120 ° C. can be used. For example, polyester resin, polyether resin, polyamide resin, polystyrene resin, ethylene-vinyl acetate resin, vinyl chloride-
The vinyl acetate copolymer and the urethane-modified lanolin resin may be used alone or in combination of two or more. Preferably, the melt viscosity at 100 ° C. is 3000 to
An isocyanate polymer of 50,000 cst of lanolin fatty acid polyhydric alcohol ester or an ethylene-vinyl acetate resin having a melt flow rate of 5 to 2000 dg / min can be used. More preferably, a mixture of both can be used. When used as a mixture of both, the blending ratio of the ethylene-vinyl acetate resin in the mixture is preferably 25 to 70% by weight.

Further, as the coloring material, black dyes and pigments such as carbon black, oil black and graphite; C.I. I.
Pigment Yellow 1, the same 3, the same 74, the same 97, the same 9
Acetoacetic acid arylamide-based monoazo yellow pigment (Fast Yellow) such as 8; I. Pigment Yellow 1
Acetoacetic acid arylamide bisazo yellow pigments such as 2, 2, 13 and 14; C.I. I. Solvent Yellow 19,
77, 79, C.I. I. Disperse Yellow 16
A yellow dye such as C.4; C.I. I. Pigment Red 8 and 4
9: 1, 53: 1, 57: 1, 81: 122,
Red pigments such as 5; C.I. I. Solvent Red 52, 58, 8 and other red dyes; C.I. I. Pigment Blue 15: 3 and other copper phthalocyanines and their derivatives, modified dyes and the like can be used, and also colored or colorless sublimable dyes, conventional printing inks, and other dyes and pigments well known for coloring purposes can be used. These dyes and pigments may be used alone or in combination of two or more.

In addition to the heat-melting resin and the coloring material, a binder material may be added to the heat-melting ink layer, if necessary. As the binder material to be added, styrene such as styrene, vinyltoluene, α-methylstyrene, chlorostyrene, vinylbenzoic acid, sodium vinylbenzenesulfonate, and aminostyrene, homopolymers and copolymers of derivatives and substitution products thereof are used. Can be used.
Furthermore, methyl methacrylate, ethyl methacrylate,
Methacrylic acid esters and methacrylic acid such as butyl methacrylate and hydroxymethacrylate; acrylic acid esters and acrylic acid such as methyl acrylate and 2-ethylhexyl acrylate; dienes such as butadiene and isoprene; acrylonitrile, vinyl ethers, maleic acid and maleic acid esters Vinyl monomers such as, maleic anhydride, cinnamic acid and vinyl chloride;
It is also possible to use a homopolymer of or a copolymer with another monomer. Of course, in the case of the vinyl-based polymer, a polyfunctional monomer such as divinylbenzene may be used as a cross-linked polymer.

Furthermore, polycarbonate, polyester, silicone resin, fluorine resin, phenol resin, tempen resin, petroleum resin, hydrogenated petroleum resin, alkyd resin, ketone resin, cellulose derivative and the like may be used. When these polymers or oligomers are used in the form of copolymers, the copolymers include random copolymers, alternating copolymers, block copolymers and interpenetrating copolymers, depending on the required application. A copolymerization mode such as the above can be appropriately selected and used. When two or more kinds of polymers or oligomers are mixed and used, in addition to mechanical mixing such as melt mixing, solution mixing and emulsion mixing, they are mixed by coexisting polymerization or multi-stage polymerization method when polymerizing the polymer or oligomer components. You may.

Further, if necessary, waxes, oils, (liquid) plasticizers, or resins may be added to and mixed with the above-mentioned hot-melt ink layer. In addition, ethylene,
Olefin homopolymers or copolymers such as propylene, organic acid graft olefin copolymers, chlorinated paraffins, low molecular weight urethane compounds, plasticizers that are solid at room temperature,
Charge control and / or prevention agents such as surfactants, conductive agents, antioxidants, thermal conductivity improvers, magnetic materials, strong derivatives,
An antiseptic, a fragrance, an antiblocking agent, a reinforcing filler, a release agent, a foaming agent, a sublimable substance, an infrared absorbing agent and the like may be added to the above heat-meltable ink layer or other layers.

There are no particular restrictions on the blending ratio of each component constituting the heat-meltable ink layer, but as a general range, the heat-meltable resin is 1 to 80% by weight and the binder material is 1%.
It is 0 to 50% by weight, and the coloring material is 10 to 60% by weight.

The above-mentioned heat-meltable ink layer can be formed by mixing the respective components constituting the above-mentioned heat-meltable ink layer and applying them on the above-mentioned substrate. The thickness of the heat-meltable ink layer is generally about 0.1 to 10 μm.

In the thermal transfer recording medium, a release layer may be provided between the base material and the heat fusible ink layer. By providing the release layer, a highly sensitive thermal transfer recording medium can be obtained, and the printing quality of the printed image formed on the image transfer sheet of the present invention is further improved. The wax used in the release layer is preferably one or more selected from the group consisting of natural wax, synthetic wax and compounded wax. In addition to waxes, in order to improve coating strength and flexibility, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, polyethylene,
Resins such as petroleum resin may be added.

Next, the transparent or matte film for retransferring the thermal transfer image transferred onto the image transfer sheet of the present invention will be explained. The transparent or matte film has an adhesive layer provided on one side thereof. The material for forming the pressure-sensitive adhesive layer is not particularly limited, and a conventionally known pressure-sensitive adhesive,
For example, it is possible to use polyisobutylene, natural rubber, polyvinyl butyral, or the like mixed with ester gum or coumarone resin and further added with a plasticizer such as phthalate ester or castor oil.

As the material of the transparent or matte film, polyethylene, polyester, polyvinyl alcohol, cellophane, etc. can be used. The thickness of the transparent film is not particularly limited, but generally 5 to 5
The range of 0 μm is preferably used.

Further, as the transparent or matte film, a commercially available transparent adhesive tape such as cellophane tape can be used.

According to the image transfer sheet of the present invention, for example, characters or figures edited by a commercially available thermal transfer word processor are transferred to the image transfer sheet of the present invention,
Further, since the transferred characters and figures can be easily retransferred to a transparent adhesive tape or the like, an adhesive label or the like can be prepared extremely easily. Such an adhesive label is extremely convenient as a name label, a file heading, an operation display of a telephone or an OA device, a title of a floppy disk, a title of an audio cassette, a title of a video cassette, and the like.

[0041]

The present invention will be described in more detail with reference to the following examples. However, it goes without saying that the scope of the present invention is not limited to such examples.

[Example 1] PET film (Toray Lumirror # 100X43, center line average roughness (Ra) 0.35)
μm) with an addition reaction type silicone solution for release paper (manufactured by Toray Dow Chemical Co., Ltd., silicone base: SD7226, catalyst: SRX212, silicone concentration 5 wt%, catalyst amount 0.9 wt% (to silicone)) with a Meyer bar. Then, curing was carried out with a hot air circulation dryer (120 ° C., 60 sec) to prepare an image transfer sheet.

The transferability and releasability of the image transfer sheet thus obtained were evaluated as follows. Set the NEC word processor ribbon (black) Type S in a commercially available word processor (NEC Bungou Mini 5Si) and print density:
MAX, printing speed: Printing was performed on the image transfer sheet at a low speed, and the transferability of the print on the image transfer sheet was evaluated. The evaluation criteria are as follows. [Transferability Evaluation Criteria] A: The printed image is completely transferred B: A part of the printed image is not transferred (1% or less) C: 1 to 10% of the printed image is not transferred D: 10% or more of the printed image Untranscribed

Next, the peelability of the printed image using the adhesive tape was evaluated using 3M clear tape (width 18 mm × 35 mm). The evaluation criteria are as follows. [Peelability Evaluation Criteria] A: The printed image is completely peeled B: A part of the printed image is not peeled (1% or less) C: 1 to 10% of the printed image is not peeled D: 10% or more of the printed image Table 1 shows the results of evaluation of transferability and peelability.

[Example 2] PET film (KIMOT
O matte mirror # 100, center line average roughness (Ra)
0.90 μm) addition reaction type silicone solution for release paper (Toray Dow Chemical, Silicone base: SD72
26, catalyst: SRX212, silicone concentration 5 wt%,
A catalyst amount of 0.9 wt% (relative to silicone) was applied with a Meyer bar, and a hot air circulation dryer (120 ° C, 60se) was applied.
Curing was performed in c) to produce a sheet for transferring an image.

The transferability and the peelability of the obtained image transfer sheet were evaluated in the same manner as in Example 1. Table 1 shows the results.

Example 3 An OPP film (center line average roughness (Ra) adjusted to 0.25 μm by sand mat treatment) was added to an addition reaction type silicone solution for release paper (Shin-Etsu Silicone, silicone base: KS774). ,
Catalyst: CAT-PL-4, silicone concentration 5 wt%, catalyst amount 1.0 wt% (relative to silicone) was applied with a Meyer bar, and hot air circulation dryer (120 ° C, 60 sec).
Then, the sheet was cured to prepare an image transfer sheet.

The transferability and the peelability of the obtained image transfer sheet were evaluated in the same manner as in Example 1. Table 1 shows the results.

Example 4 PE laminated paper (center line average roughness (Ra) adjusted to 0.09 μm) was used for release paper condensation reaction type silicone solution (Shin-Etsu Silicone, silicone base: KS709, catalyst: CAT-P-6,
A silicone concentration of 5 wt% and a catalyst amount of 4.0 wt% (relative to silicone) were applied with a Meyer bar and cured with a hot air circulation dryer (160 ° C., 30 sec) to prepare an image transfer sheet.

The transferability and peelability of the obtained image transfer sheet were evaluated in the same manner as in Example 1. Table 1 shows the results.

[Example 5] Glassine paper (center line average roughness (Ra) adjusted to 0.13 µm) was added to an addition reaction type silicone solution for release paper (Shin-Etsu Silicone, silicone base: KS771, catalyst: CAT). -P-3, silicone concentration 5wt%, catalyst amount 0.4wt% (relative to silicone) are applied by Meyer bar, and cured by hot air circulation dryer (160 ° C, 30sec) for image transfer. A sheet was prepared.

The transferability and the peelability of the obtained image transfer sheet were evaluated in the same manner as in Example 1. Table 1 shows the results.

Comparative Example 1 A PET film (Lumirror T60 manufactured by Toray) was used as a sheet for image transfer.

The transferability evaluation and the peelability evaluation of this image transfer sheet were carried out in the same manner as in Example 1. Table 1 shows the results.

Comparative Example 2 PET film-based release paper (TGH: SGH 38 μ) was used as an image transfer sheet.

Transferability evaluation and peelability evaluation of this image transfer sheet were carried out in the same manner as in Example 1. Table 1 shows the results.

[0057]

[Table 1]

[0058]

As described above in detail, according to the present invention,
When the heat-melted ink layer is thermally transferred from the heat transfer recording medium to the print image transfer sheet by the heat transfer recording method to form a print image on the print image transfer sheet, the print quality of the print image is excellent and the print image is formed. It is possible to obtain a sheet for image transfer which has improved peeling characteristics when retransferred.

[Brief description of drawings]

FIG. 1 is a diagram showing a method of forming a printed image on a printed image transfer sheet of the present invention.

FIG. 2 is a diagram showing a state in which a transparent film having an adhesive layer is attached to the image transfer sheet of the present invention.

FIG. 3 is a diagram showing a state in which the transparent film in FIG. 2 is peeled off and an image is retransferred to the transparent film.

[Explanation of symbols]

 10 Image Transfer Sheet 11 Silicone Resin Layer 12 Thermal Head 14 Platen Roll 16 Thermal Transfer Recording Medium 18 Thermal Melt Ink Layer 20 Image 22 Transparent Film 24 Adhesive Layer

Claims (4)

[Claims] 1. An image transfer sheet for retransferring an image transferred by heat from a thermal transfer recording medium by a thermal transfer system onto a surface of the adhesive layer of a transparent or matte film having an adhesive layer, wherein the image is transferred by heat. An image transfer sheet having a silicone resin layer on the surface to be printed. 2. The image transfer sheet according to claim 1, wherein the silicone resin layer comprises a condensation reaction type silicone resin layer. 3. The image transfer sheet according to claim 1, wherein the silicone resin layer comprises an addition reaction type silicone resin layer. 4. Comprising polyethylene terephthalate,
The image transfer sheet according to claim 1.