JP2000301843A - Thermal transfer image receiving sheet for sealing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal transfer image receiving sheet for sealing having no trouble of releasing a sealed portion in the step of conveying in a printer by maintaining a release strength of a released portion of the sheet from the sealed portion similarly to that of prior art. SOLUTION: In the thermal transfer image receiving sheet for sealing comprising a sealing portion having at least a receptive layer, a sealing base material, and an adhesive layer sequentially laminated, and a releasing portion having a release layer and a releasing base material in such a manner that the release layer and the adhesive layer are releasably adhered, a chart record of the release strength of the sealing portion and the releasing portion measured according to a 180-degree peeling method based on JIS Z 0237 continues a fine change.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal portion in which an image is formed by thermal transfer, in which at least a receiving layer, a seal base material and a pressure-sensitive adhesive layer are sequentially laminated, and a release portion comprising a release layer and a release base material. In the thermal transfer image-receiving sheet for sealing, wherein the pressure-sensitive adhesive layer and the release layer are peelably bonded to each other, the thermal transfer image-receiving sheet for sealing is supplied to a thermal transfer printer, and during printing, from the cut end. It belongs to a thermal transfer image-receiving sheet for a seal that prevents malfunctions such as peeling.

[0002]

2. Description of the Related Art Conventionally, there have been known various image forming methods by thermal transfer. In these methods, an image is heated by a thermal head or the like from the back of a thermal transfer sheet having a colored transfer layer provided on a base sheet. The color transfer layer is thermally transferred to the surface of the thermal transfer image receiving sheet to form an image. This thermal transfer method is roughly classified into two types, a sublimation transfer type and a hot-melt transfer type, depending on the configuration of the colored transfer layer.
In both cases, a full-color image can be formed. For example, a full-color image can be formed by successively thermally transferring the images of each color to the image forming surface of the thermal transfer image receiving sheet of the corresponding thermal transfer image receiving sheet of three to four colors of black, if necessary, further to yellow, magenta, and cyan. . Due to the various hardware and software developments associated with multimedia, these thermal transfer methods have been developed for computer graphics, satellite based still images, and C
The market is expanding as a full-color copy system for analog images such as digital images and video such as DROM and the like.

[0003] The thermal transfer image-receiving sheet provided with an image by these thermal transfer methods has a wide variety of uses. Typical examples are print proofing, image output, CAD / C
Design and output of design by AM etc., various medical analysis equipment such as CT scan and endoscope camera, recording use of output of measuring instrument, etc., substitute for instant photo, identification card, ID card, credit card There are other uses such as output of a face photograph to cards and the like, as well as a composite photograph and a commemorative photograph in amusement facilities such as an amusement park, a game center, a museum, and an aquarium. As described above, along with the diversification of applications, products that can be attached to arbitrary objects to be attached are also supplied. For example, a heat transfer image is formed in a state where the receiving layer and the seal base material for forming the image are laminated with the release part via the adhesive layer, and after the release part is peeled off, the seal base material is applied to an arbitrary object with an adhesive. There is a thing of the use to stick with.

FIG. 3 shows a cross-sectional shape of a conventional thermal transfer image-receiving sheet for sealing used in the above-mentioned application.
FIG. 4 is an enlarged plan sectional view of FIG. The thermal transfer image-receiving sheet for sealing 20 shown in FIG. 3 is supplied to the printer in a sheet-by-sheet manner, and a thermal transfer sheet (not shown) is superimposed on the surface thereof, and the thermal transfer sheet is heated from the back side into an image by a thermal head or the like. Then, the colored transfer layer of the thermal transfer sheet is transferred to the receiving layer of the heat transfer image receiving sheet for sealing,
Desired image 8 on the surface of the receiving layer of the thermal transfer image-receiving sheet for sealing
Is provided.

The above-mentioned heat transfer image receiving sheet 20 for sealing is
As shown in the schematic diagram of FIG. 3, half cuts 4 are formed in a large number of regions in an arbitrary shape. An image 8 is formed in each of the plurality of areas so as to correspond to each area, and a seal portion 8 capable of forming a plurality of images as shown in FIG. 4 on one image receiving sheet can be arranged.

The half-cut 4 can be formed by inserting a heat transfer image-receiving sheet 20 for sealing between the upper die having a cutter blade and the pedestal, and moving the upper die up and down, or a cylinder type rotary. A method using a cutter may be used. The image 8, for example, a photographic image, formed in the area of the seal portion 5 distinguished by the half cut 4, along with the adhesive layer 3 along the half cut as shown in FIG. 6), the seal portion 5 which has been peeled off may be attached to an arbitrary article (sticking target 9) such as a notebook, a notebook, a bag, and other desired articles and places as shown in FIG. Can be.

As described above, the conventional heat transfer image-receiving sheet for sealing with half-cuts includes a sealing portion 5 in which a receiving layer 1, a sealing base material 2 and an adhesive layer 3 are laminated, as shown in FIG. Ten release layers 6 are overlapped with the pressure-sensitive adhesive layer 3 in contact therewith, and the half cuts 4 reach the release layer 6 substantially through the layers of the pressure-sensitive adhesive layer 3. Therefore, when the thermal transfer image-receiving sheet for sealing is conveyed in a bent state by a printer or the like, or when heated and printed by a thermal head, the seal portion 5 is peeled off from the surface of the peeling portion 10 by the half cut portion 4. there were. Especially when the image portion 8 was small, it could even fall off.

[0008]

As described above, both the printer having the problem of peeling in the printer and the printer which does not easily cause peeling are described in JIS Z0237 "Adhesive tapes / papers".
The average peel strength between the peeling portion and the release layer based on 9.3.1 (180-degree peeling method) of “Testing method of pressure-sensitive adhesive sheet” is substantially the same. That is, as shown in FIG. 2, the peeling part 10 and the seal part 5 are peeled off in the direction of 180 degrees, the peeling part is fixed by the fixing part 14, and the strength when the seal part 5 is peeled at a constant speed in the peeling direction 15 is reduced. Measure continuously and record on chart. The average peel strength at this time is, as shown in the peel state 12 of the comparative example of FIG.
This is almost the same as the peeling state 11 of the embodiment. However, focusing on the fact that the chart record indicated by the measured peeling strength, which is difficult to peel with a printer, slightly changes as shown in the peeling state 11 of the embodiment, and provides a heat transfer image-receiving sheet for a seal in which the peeling strength slightly changes. Another object of the present invention is to solve the problem of peeling of the seal portion during the process in the printer.

[0009]

SUMMARY OF THE INVENTION In order to solve these problems, the present invention provides a "sealing portion" in which at least a receiving layer, a sealing base material and a pressure-sensitive adhesive layer are sequentially laminated, a release layer and a release layer. In the thermal transfer image-receiving sheet for sealing, which is detachably bonded to a “peeling portion” composed of a substrate,
This is a heat transfer image-receiving sheet for sealing in which the peel strength between the seal portion and the peeling portion measured in accordance with the 180 degree peeling method of Z037 slightly changes on the chart record. And
The slight change in the peel strength is 1 g / cm to 10 g / cm
The thermal transfer image-receiving sheet for a seal in the range of (1). Also,
The seal portion of the thermal transfer image-receiving sheet for sealing is a thermal transfer image-receiving sheet for sealing that has been subjected to a half-cut process.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to preferred embodiments. FIG. 5 is a schematic cross-sectional view of the thermal transfer image-receiving sheet for sealing 20 of the present invention. The thermal transfer image-receiving sheet 20 has a sealing portion 5 in which a receiving layer 1, a sealing base material 2, and an adhesive layer 3 are sequentially laminated, a release layer 6, and a release base. The heat transfer image-receiving sheet 20 for a seal, in which the release layer 6 of the release section 10 made of the material 7 and the adhesive layer are peelably bonded. And
It is performed by a method based on the 180-degree peeling method described in 8.3.1 of JIS Z0237. That is, as shown in FIG. 2, the peeling part 10 and the seal part 5 are peeled off in the direction of 180 degrees, and the peeling part is fixed by the fixing part 14.
The thermal transfer image-receiving sheet for a seal, in which the strength at the time of peeling at a constant speed in the peeling direction 15 is continuously measured and the peeling strength recorded on a chart slightly changes as shown in the peeling state 11 of the embodiment of FIG. 20. The thermal transfer image-receiving sheet for sealing has a slight change in the peel strength in the range of 1 g / cm to 10 g / cm. The seal portion 5 of the sealing thermal transfer image receiving sheet 20 is a sealing thermal transfer image receiving sheet on which the half-cut processing 4 has been performed.

(Peeling part) Peeling part 1 used in the present invention
0 is formed from the release substrate and the release layer. For example, a release layer 6 having a releasability with a known release agent such as silicone is provided on the polyethylene side of a conventionally known plastic film or polyethylene coated paper. Specifically, Lumilar T-60 manufactured by Toray Industries, Inc. (thickness: 50 μm)
And W-400 manufactured by Diafoil Co., Ltd. (thickness 38 μm)
Can be used. The thickness of the peeling portion 10 varies depending on the material, but is preferably 20 to 150 μm, and when the peeling portion is 20 μm or less, the so-called stiffness of the configured thermal transfer image-receiving sheet for sealing is reduced, and the thermal transfer printer is used. The sheet cannot be conveyed, or wrinkles occur on the thermal transfer image receiving sheet. On the other hand, if the peeling portion 10 is too thick, the resulting thermal transfer image-receiving sheet for sealing will be too thick, and the load when conveyed by the thermal transfer printer will be large, resulting in failure of the printer or failure of normal conveyance.

In order to finely change the peel strength between the seal part and the peel part, it is preferable to form an uneven shape on the surface of the release layer. The uneven shape of the release layer may be a method of providing the release substrate with an uneven shape.However, the coating liquid of the release layer is applied using a gravure printing plate, and the surface of the release layer in contact with the pressure-sensitive adhesive layer is used. In addition, a line-shaped convex portion and / or a dot-shaped convex portion are formed on the substrate. At this time, the line-shaped protrusions and / or the dot-shaped protrusions have a height of 0.5 μm to 5 μm.
The thickness is preferably 0.0 μm and the interval is preferably 0.1 mm to 0.5 mm.

[0013] Further, it comprises a seal portion in which at least a receiving layer, a seal base material and a pressure-sensitive adhesive layer are laminated in this order, a release layer, and a release portion composed of a release base material. In the method for producing a heat transfer image-receiving sheet for a seal that is peelably bonded, after applying a release layer, a roll having a smooth surface or fine irregularities formed on the surface of the release layer is press-bonded. By doing so, a line-shaped convex portion and / or a dot-shaped convex portion are formed on the release layer surface. At this time, it is preferable that the line-shaped protrusions and / or dot-shaped protrusions are formed with a height of 0.5 to 50.0 μm and an interval of 0.1 to 0.5 mm.

The release substrate 7 used in the present invention is a surface-untreated (no corona discharge treatment for enhancing adhesion) polyolefin film, for example, polyethylene or polypropylene. Particularly preferred is a stretched or non-stretched polyethylene film, and the surface of the film can be provided by a cooling roll having the above surface roughness during film formation. According to the findings of the present inventors, a stretched or unstretched film of polyethylene is used as a peeling portion of a heat transfer image-receiving sheet for sealing by selecting the type of an adhesive without providing a release layer as in the conventional case. be able to. The separation between the peeling portion 10 and the pressure-sensitive adhesive layer 3 (see JIS Z02)
180 degree peel strength of 10-75g
/ Cm to a preferred range. In this range, the thermal transfer image-receiving sheet for sealing whose peeling strength is adjusted does not cause peeling (turning) of the half-cut area in image formation by the printer, and further, does not tear off from the half-cut area after image formation, and peels off the seal portion. be able to. The thickness of the release substrate 7 is 20 to
It is in the range of 100 μm, preferably 35-75 μm.
Such stretched or unstretched polyethylene films include, for example, Crisper manufactured by Toyobo Co., Ltd. and Toray Industries, Inc.
E60 and the like can be obtained from the market. In addition, polymethylpentene, polyethylene terephthalate, polyethylene naphthalate, polyamide, polyimide, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, ethylene / vinyl alcohol copolymer, polycarbonate, fluororesin, polymethyl methacrylate, polybutene 1, polyetheretherketone, polysulfone, polyethersulfone,
Unstretched or stretched films such as polyphenylene sulfide can be mentioned. Further, a plastic film having microvoids inside may be used.

(Adhesive layer) Adhesive layer 3 used in the present invention
Can be formed using a conventionally known resin or a resin obtained by dissolving rubber in an organic solvent, or an adhesive dissolved or dispersed in an aqueous solvent. The adhesive includes, for example, polyvinyl acetate, acrylic resin, vinyl acetate / acrylic copolymer, vinyl chloride / vinyl acetate copolymer, ethylene
It can be used by selecting from vinyl acetate copolymer, polyurethane, natural rubber, chloroprene rubber, nitrile rubber and the like.

The coating amount of the pressure-sensitive adhesive layer 3 is 8 to 30 g / m ^2.
(Solid content) and the properties and pressure-sensitive adhesive amount of the pressure-sensitive adhesive from known methods such as gravure coat, gravure reverse coat, roll coat, comma coat, die coat, bar coat, and air knife coat. Is applied so as to penetrate into the concave portion of the release layer 6, and the volatile component is dried and adhered to the seal base material 2.
It is preferable to form the thermal transfer image-receiving sheet 20 for sealing. In order to allow the pressure-sensitive adhesive layer 3 to enter the recesses of the release layer, the viscosity of the pressure-sensitive adhesive layer coating liquid is preferably 20 to 60 seconds, more preferably 3 to 60 seconds.
The coating is preferably performed in a range of 0 to 40 seconds (measured by Zahn cup # 3). When the viscosity is low, it is difficult to regulate the coating amount, and when the viscosity is high, the adhesive does not enter into the concave portion of the release layer, so that it is difficult to give a slight change in the peel strength. In addition, the pressure-sensitive adhesive layer has a peel strength between the seal portion and the peel portion,
Based on the method based on JIS Z0237,
The type of the adhesive, the coating amount, and the release portion 10 are set so as to be set in the range of 75 g / cm, preferably 10 to 50 g / cm.
It is preferable to select and use.

(Seal Substrate) The seal substrate 2 in the thermal transfer image-receiving sheet for sealing of the present invention may be a conventionally known one. For example, Toyobo Co., Ltd. “Toyopearl SS P
4255 ”(thickness 35 μm), polypropylene film having microvoids (fine pores) inside a substrate such as“ MW247 ”(thickness 35 μm) manufactured by Mobile Plastic Europe, and“ W-900 ”(thickness 50 μm) manufactured by Diafoil Co., Ltd. ), “E-60” manufactured by Toray Industries, Inc.
m) and the like, a polyethylene terephthalate film having microvoids (fine pores) inside the substrate is preferably used. The heat transfer image-receiving sheet for sealing according to another embodiment of the present invention includes a laminate of a resin film having no microvoids in contact with the pressure-sensitive adhesive layer 3 and a resin film having microvoids in contact with the receptor layer 1. A constituted sealing substrate can also be preferably used. Such a configuration improves the color formation of an image to be formed, particularly in a high density portion,
High quality images can be formed.

The resin film that can be usefully used in the above-mentioned sealing base material without having microvoids inside is formed of polyethylene terephthalate, polyethylene, polypropylene or the like. And the thickness is
Although it depends on the material and the presence or absence of stretching, a range of 10 to 50 μm is preferable. When the film is thin, there is no so-called stiffness, and the resulting thermal transfer image-receiving sheet for sealing generates wrinkles in thermal shrinkage when forming an image with a thermal head or the like. Curling due to heat setting is likely to occur due to the heat. As a preferred example, “Lumirror S-1” manufactured by Toray Industries, Inc.
0 "(thickness: 38 μm).

As the above-mentioned sealing base material having microvoids inside, and useful resin films, conventionally known resin films having microvoids such as polypropylene and polyethylene terephthalate can be used.
In particular, a polypropylene film is preferable because it has excellent cushioning properties and heat insulation properties, and can uniformly transfer the dye to the receptor layer by making uniform pressure contact with the thermal head of the printer. The thickness of these films is 30-60 μm
Preferred examples include “Toyopearl P4255” (thickness: 35 μm) manufactured by Toyobo Co., Ltd. and “Toyopearl P”
4256 "(thickness: 60 μm).

Further, as the sealing base material, a film having the above-mentioned microvoids and a film having no microvoids can be laminated and used. The lamination method may be a conventional method, and dry lamination using a reaction-curable (or adhesive or heat-sensitive) adhesive dissolved in a solvent, a reaction-curable type containing no solvent (or an adhesive type,
So-called non-sol laminate using heat-sensitive adhesive
A conventionally known method such as hot-mel lamination or sandwich lamination in which a thermoplastic resin is melted and extruded between two films and laminated can be used. Preferred methods are dry lamination or non-sol laminate. As an adhesive suitable for dry lamination, Takeda Pharmaceutical Co., Ltd. “Takelac A969V (base agent) / Takenate A-5 (hardener) = 3/1 (mixing ratio)
and so on. The coating amount of these adhesives is 1 to 8 g / m ^2.
(Solid content), preferably 2 to 6 g / m ² .

(Receiving Layer) The receiving layer 1 formed on the sealing base material 2 can be provided directly on the base material or via a primer layer. The configuration of the receiving layer is different depending on the difference between the respective systems of the thermal fusion transfer recording and the sublimation transfer recording. Further, in the thermal fusion transfer recording, the coloring transfer layer can be thermally transferred directly from the thermal transfer sheet to the sealing base material without necessarily providing the receiving layer. Both the receiving layer of the thermal melting transfer recording and the receiving layer of the sublimation transfer recording have an action of receiving the color material transferred from the thermal transfer sheet by heating. In particular, in the case of a sublimable dye, it is desired that the dye is received and colored, and that the dye once received is not further sublimated.

The receiving layer is generally composed mainly of a thermoplastic resin. The materials constituting the receiving layer are ethylene-vinyl acetate copolymer, polyolefin such as polypropylene, copolymer of olefin monomer and other vinyl monomer, ionomer, cellulose derivative such as cellulose diacetate, vinyl chloride / vinyl acetate Examples thereof include copolymers, halogenated polymers such as polyvinylidene chloride, polyesters such as polyvinyl acetate, polyacrylate, and linear polyester, polystyrene resins, polycarbonate resins, and polyamides. Preferred among these are polyester, vinyl chloride / vinyl acetate copolymers, and mixtures thereof.

At the time of image formation, a release agent is added to the receptor layer of the sublimation transfer recording system in order to prevent fusion of the thermal transfer sheet having the colored transfer layer and the receptor layer of the thermal transfer image-receiving sheet for sealing or decrease in printing sensitivity. It is preferable to mix them. Preferred release agents that can be used in combination are silicone oil,
Phosphate-based surfactants, fluorine-based surfactants and the like can be exemplified, but modified silicone oil is preferred. Modification of silicone oil includes epoxy modification, vinyl modification, alkyl modification, amino modification, carboxyl modification,
Modified silicone oils such as alcohol-modified, alkyl-aralkyl-polyether-modified, epoxy / polyether-modified, and polyether-modified are preferred.

The release agent to be added to the receiving layer is used by mixing one or more of the above-mentioned releasing agents. The amount of the releasing agent is 0 based on 100 parts by weight of the composition forming the receiving layer. 0.5 to 30 parts by weight is preferred. If the addition amount is less than the above range, problems such as fusion between the sublimation type thermal transfer sheet and the receptor layer of the thermal transfer image receiving sheet or reduction in printing sensitivity may occur. By adding such a release agent to the receptor layer, the release agent bleeds out on the surface of the receptor layer after image transfer, and a release layer is formed. Further, these release agents can be applied onto the receiving layer without being added to the receiving layer. The receiving layer is obtained by adding a necessary additive such as a release agent to the above-described resin to the sealing base material and dissolving or dispersing the resin in an appropriate solvent to form a coating liquid, and the properties of the coating liquid It is formed by coating and drying with a coating method suitable for In the receiving layer, a white pigment, a fluorescent whitening agent, or the like can be added in order to improve the whiteness of the receiving layer and increase the sharpness of the transferred image. The thickness of the receiving layer to be formed is generally 1
It can be appropriately selected within a range of from 50 μm (solid content).

The receiving layer of the heat transfer image-receiving sheet for sealing is preferably a continuous layer.
Alternatively, a patterned discontinuous layer may be formed by using a water-soluble resin. Further, an antistatic agent can be coated on the receptor layer in order to stably improve the transportability of the thermal transfer printer. Although not shown, a slip layer can be provided on the release substrate for the purpose of preventing double feed at the time of paper feeding in the thermal transfer printer on the release substrate side of the thermal transfer image-receiving sheet for sealing. The slip layer is made of a well-known resin such as polyvinyl butyral, polyacrylate, polymethacrylate, polyvinylidene chloride, linear polyester, polyurethane, polycarbonate and polyvinyl acetate, and various fine particles and lubricant such as silicone are added. Can be used.

The thermal transfer image-receiving sheet for sealing of the present invention comprises at least a release layer including a receiving layer, a sealing substrate, an adhesive layer, and a release layer, so that the release layer and the adhesive layer at the release section can be released. It is the structure laminated | stacked. An antistatic layer may be provided on the receiving layer or the back surface of the seal portion, or on the outermost surface of both surfaces. The antistatic layer is formed by dissolving or dispersing fatty acid esters, sulfate esters, phosphate esters, amides, quaternary ammonium salts, betaines, amino acids, acrylic resins, ethylene oxide adducts, etc. in a solvent. Can be formed. The formation method can be applied in the same manner as the receiving layer or the like. The coating amount of the antistatic layer is
0.001 to 0.1 g / m ² is preferred.

An intermediate layer mainly composed of various resins can be provided between the sealing base material and the receiving layer of the sealing portion. By providing the intermediate layer with a necessary function, an excellent function can be given to the seal portion. For example, as a material having a cushioning effect, a resin having large elastic deformation or plastic deformation, for example, polyolefin, vinyl copolymer, polyurethane, polyamide, etc., is used to improve the printing sensitivity of the receiving layer and prevent screen roughness. it can. Further, in order to provide the intermediate layer with an antistatic ability, the above-mentioned material for imparting cushioning property is added with the above antistatic agent, and a solution dissolved or dispersed in a solvent is applied to form an intermediate layer. it can.

The heat transfer image-receiving sheet for sealing of the present invention has a half-cut 4 as shown in FIGS. 3 and 5 except for the peeling portion 10 in order to take out the seal portion from the peeling portion. The method of forming this half cut is to insert a heat transfer image-receiving sheet for sealing between the upper die with the cutter blade and the pedestal to move the upper die up and down, or to perform half cut such as a cylinder type rotary cutter. The method is not particularly limited as long as it is possible.

The contents of the present invention will be described in more detail based on examples and comparative examples.

(Example) A release layer having the following composition was formed on one surface of a release substrate 7 (surface corona-treated polyethylene terephthalate film, Crisper G-1212 manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm shown in FIG. Was formed in a dry state at a coating amount of 0.1 g / m ² by gravure coating using a cell plate, and a smoothing roll having a flat surface was pressed against the surface of the release layer in front of a drying hood. And 130
It dried at 15 degreeC for 15 second, and the release layer 6 was formed. (Composition of release layer coating liquid) Addition polymerization type silicone (KS847H manufactured by Shin-Etsu Chemical Co., Ltd.) 100 parts by weight Toluene 200 parts by weight

The above release layer is coated with a pressure-sensitive adhesive layer having the following composition at a rate of 10 g / m ² in a dry state by gravure coating.
The adhesive layer 3 was formed by heating and drying at 0 ° C. for 60 seconds. The viscosity of the coating liquid for the adhesive layer was measured by Zahn Cup # 3 and was 15 seconds. (Composition of Coating Solution for Adhesive Layer) Acrylic copolymer (SK Dyne 1310L manufactured by Soken Chemical Co., Ltd.) 48 parts by weight Epoxy resin (Hardening Agent-AX manufactured by Soken Chemical Co., Ltd.) 0.36 parts by weight Ethyl acetate 51. 64 parts by weight

On the other hand, on one side of a 50 μm-thick seal substrate 2 (polyethylene terephthalate film having pores therein, Lumirror E63 # 50, manufactured by Toray Industries, Inc.) The receiving layer 1 was formed by gravure coating at 0.5 g / m ² . (Composition of Receptive Layer Coating Solution) 40 parts by weight of vinyl chloride / vinyl acetate copolymer (# 1000A manufactured by Denki Kagaku Kogyo Co., Ltd.) Polyester (Byron 600 manufactured by Toyobo Co., Ltd.) 40 parts by weight Vinyl chloride / styrene / Acrylic copolymer 20 parts by weight (# 400A manufactured by Denki Kagaku Kogyo Co., Ltd.) 10 parts by weight of vinyl-modified silicone (X-6-1212 manufactured by Shin-Etsu Chemical Co., Ltd.) Catalyst (CAT-PLR manufactured by Shin-Etsu Chemical Co., Ltd.) -5 5 parts by weight Methyl ethyl ketone / toluene (1/1) 400 parts by weight

The other surface of the seal substrate and the surface of the adhesive layer of the release substrate were laminated at 100 ° C. for 12 seconds. Then, a quaternary ammonium salt compound (1% solution of TB-34 manufactured by Matsumoto Yushi Seiyaku Co., Ltd.) was applied as an antistatic agent to the surface of the receiving layer. Further, the sheet is cut to a size of 10 cm in length and 15 cm in width, and at the same time, a half-cut process shown in FIG. 5 is performed to prepare a thermal transfer image receiving sheet 20 for sealing having an example of a seal portion 5 shown in FIG. did.

(Comparative Example 1) A heat transfer image-receiving sheet for sealing 20 of Comparative Example 1 was prepared using the same materials and processes as in the example except that the viscosity of the silicone used was changed to 11 seconds.

(Comparative Example 2) A thermal transfer image-receiving sheet 20 for sealing according to Comparative Example 2 was prepared using the same materials and steps as in Example 1, except that the viscosity of the silicone used was changed to 20 seconds.

The following evaluations were made on each sample of the examples and comparative examples. Peeling strength: The peeling base 7 of the peeling part 10 and a stainless steel plate having a thickness of 0.3 mm are fixed with a double-sided adhesive tape by the method shown in FIG.
3.1 In accordance with the "180-degree peeling method", the adhesive layer 3 and the release layer 6 of the sample cut to a width of 1 cm in the vertical direction are peeled off at a speed of 30 cm / min and continuously. The change in peeling strength was recorded on a chart, and the maximum value and the minimum value converted to a width of 1 cm were measured. Printer transport suitability: Each sample was fed to a printer UPC200 manufactured by Sony Corporation, and a 100-sheet thermal transfer sheet was repeatedly tested to evaluate the rate of occurrence of defects such as turning over. Occurrence of wrinkles during peeling: The seal was peeled off by hand, and the occurrence of wrinkles was visually evaluated. Evaluation criteria ：: No wrinkles were observed. X: Wrinkles occur. Table 1 shows the evaluation results of each sample.

[0037]

[Table 1]

[0038]

The heat transfer image-receiving sheet for a seal of the present invention comprises:
Is designed so that the peel strength when the seal part and the peeling part are continuous changes slightly.Therefore, the peeling of the seal part and the peeling part occurs when the paper is conveyed in a printer or printed with a thermal head. It can be used without any troubles.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a peeling state of a thermal transfer image-receiving sheet for sealing of the present invention and a comparative example.

FIG. 2 is a conceptual diagram illustrating a method for measuring peel strength.

FIG. 3 is a conceptual diagram showing a cross section of a thermal transfer image receiving sheet for sealing.

FIG. 4 is a conceptual diagram showing a plane of a thermal transfer image receiving sheet for sealing provided with an image.

FIG. 5 is a conceptual diagram showing a cross section of a thermal transfer image-receiving sheet for sealing provided with an image.

FIG. 6 is a conceptual diagram showing a state where a seal provided with an image is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving layer 2 Seal base material 3 Adhesive layer 4 Half cut 5 Seal part 6 Release layer 7 Peeling base material 8 Image 9 Sticking object 10 Peeling part 10S Support plate 11 Peeling situation of an example 12 Peeling situation of a comparative example 14 fixing portion 15 peeling direction 20 heat transfer image receiving sheet for sealing

Claims (3)

[Claims] 1. A seal part comprising at least a receiving layer, a seal base material and a pressure-sensitive adhesive layer laminated in order, and a release part comprising a release layer and a release base material. In the thermal transfer image-receiving sheet for a seal, which is peelably adhered to the agent layer, the chart record of the peel strength between the seal part and the peel part measured according to the 180-degree peeling method according to JIS Z0237 shows slight changes. A heat transfer image-receiving sheet for a seal characterized by being continued. 2. A slight change in the peel strength is 2 g / cm.
A heat transfer image-receiving sheet for a seal, characterized in that the weight is 10 to 10 g / cm. 3. The heat transfer image-receiving sheet for sealing according to claim 1, wherein the seal portion of the heat transfer image-receiving sheet for sealing is subjected to a half-cut process.