JP2014065166A - Transfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer sheet capable of efficiently transferring thermal energy at the time of thermal transfer to the transfer sheet, having excellent printing suitability and high surface gloss of the obtained printed matter.
A transfer sheet (10) having a transfer layer (4) in which at least a protective layer (2) and an adhesive layer (3) are laminated in this order on a base sheet (1), and transferring the transfer layer (4) onto a transfer target, The sheet 1 was made of a plastic film having a breaking strength of 400 MPa or more and 500 MPa or less and a breaking elongation of 70% or more and 90% or less, thereby solving the above-described problems.
[Selection] Figure 1

Description

The present invention relates to a transfer sheet having a transfer layer in which at least a protective layer and an adhesive layer are laminated in this order on a base sheet, and transferring the transfer layer onto a transfer target.
This transfer sheet can be used as an intermediate transfer recording medium when the adhesive layer has a function of a receiving layer having dye acceptability. Further, when the adhesive layer mainly has an adhesive function, the transfer sheet can be used as a protective layer transfer sheet for protecting an image of a printed matter having an image by thermal transfer.

  Conventionally, a thermal transfer method has been widely used as a simple printing method. The thermal transfer method, which is one of the thermal transfer methods, is a thermal transfer image receiving sheet such as a paper or a plastic sheet. The thermal transfer sheet is provided with a color material such as a pigment and a hot melt ink layer containing a binder such as a hot melt wax or resin. And an image forming method in which energy corresponding to image information is applied from the back side of the thermal transfer sheet by a heating means such as a thermal head to transfer the color material together with the binder onto the thermal transfer image receiving sheet. An image obtained by the melt transfer method has a high density and excellent sharpness, and is suitable for recording binary images such as characters.

  Sublimation transfer method that is one of the thermal transfer methods, a thermal transfer sheet comprising a color material layer containing a sublimable dye that transfers heat by sublimation, and a thermal transfer image receiving sheet provided with a dye receiving layer on a substrate sheet, In this image forming method, energy corresponding to image information is applied from the back side of the thermal transfer sheet by a heating means such as a thermal head to transfer and transfer the sublimation dye onto the thermal transfer image receiving sheet. In this sublimation transfer method, the amount of dye transfer can be controlled in accordance with the amount of energy applied, so that it is possible to form a gradation image in which the image density is controlled for each dot of the thermal head. Further, since the color material to be used is a dye, the formed image is transparent, and the reproducibility of intermediate colors when dyes of different colors are superimposed is excellent. Therefore, when using thermal transfer sheets of different colors such as yellow, magenta, cyan, black, etc., and transferring each color dye on the thermal transfer image receiving sheet, high-quality photographic tone full-color images with excellent reproducibility of intermediate colors can be obtained. Formation is possible.

  Due to the development of various hardware and software related to multimedia, this thermal transfer method is a full-color hard copy system for analog images such as digital graphics and video such as still images by computer graphics, satellite communications and CD-ROM. As the market is expanding. The specific application of the thermal transfer image receiving sheet by this thermal transfer method is diverse. Typical examples include printing proofs, image output, CAD and CAM design and design output, various medical analyzers such as CT scans and endoscopic cameras, measuring device output applications and instant As an alternative to photos, output of ID cards, ID cards, credit cards, other face photos on cards, etc., as well as composite photos and amusement photos at amusement facilities such as amusement parks, game centers, museums, and aquariums Etc.

  With the diversification of uses of the above-mentioned thermal transfer image receiving sheet, there is an increasing demand for forming a thermal transfer image on an arbitrary object. Normally, a dedicated thermal transfer image-receiving sheet provided with a receiving layer on a substrate is used as an object for forming a thermal transfer image. However, in this case, the substrate and the like are restricted. Under such circumstances, Patent Document 1 proposes an intermediate transfer recording medium in which a receiving layer is detachably provided on a substrate. According to this intermediate transfer recording medium, the dye of the color material layer is transferred to the receiving layer to form an image, and then the intermediate transfer recording medium is heated, so that the receiving layer to which the dye is transferred can be arbitrarily transferred. The image can be transferred onto the body, and a thermal transfer image can be formed without being restricted by the transfer target.

  By the way, the thermal transfer image formed using the above intermediate transfer recording medium has a weak point lacking in durability such as weather resistance, friction resistance, chemical resistance and the like because it is a receiving layer having an image formed on the outermost surface. is there. Therefore, in recent years, as shown in Patent Document 2, an intermediate transfer recording medium in which a release layer, a protective layer, and a receiving / adhesive layer are provided on a substrate has been proposed. According to this intermediate transfer recording medium, since a protective layer is formed on the surface of the thermal transfer image, durability can be imparted to the thermal transfer image.

JP-A-62-238791 JP 2004-351656 A

However, with the recent increase in the speed of thermal transfer printers, a large amount of heat is applied to the thermal transfer sheet from the thermal head in a short time during printing.
The heat generated by the thermal head is transferred to the intermediate transfer recording medium pressed against the thermal transfer sheet through the thermal transfer sheet. However, if the thermal diffusion of the base sheet constituting the intermediate transfer recording medium is poor at the time of thermal transfer, the amount of heat transmitted is reduced, so that the thermal efficiency is deteriorated and transfer unevenness of the transfer layer may occur. Further, when the transfer layer is transferred onto a transfer material and coated, the resulting printed product has a reduced glossiness on the surface, and there is a risk that satisfactory quality cannot be obtained.

  The present invention has been made in view of the above-described situation, and heat energy at the time of thermal transfer can be efficiently transmitted to a transfer sheet, is excellent in printability, and has a high surface glossiness. It is to provide a transfer sheet.

  The present invention for solving the above problems is a transfer sheet having a transfer layer in which at least a protective layer and an adhesive layer are laminated in this order on a substrate sheet, and transferring the transfer layer onto a transfer target, The base sheet is made of a plastic film having a breaking strength of 400 MPa or more and 500 MPa or less and a breaking elongation of 70% or more and 90% or less.

  In the present invention, the base sheet is preferably an aromatic polyamide film.

  According to the transfer sheet of the present invention, it is possible to obtain a print having excellent print suitability by thermal transfer and high surface gloss.

It is sectional drawing which shows one embodiment which is the transfer sheet of this invention. It is sectional drawing which shows other embodiment which is a transfer sheet of this invention.

Next, an embodiment of the invention will be described in detail.
FIG. 1 shows one embodiment which is a transfer sheet 10 of the present invention. The transfer sheet 10 of the present invention has a configuration in which a transfer layer 4 in which a protective layer 2 and an adhesive layer 3 are sequentially laminated is provided on one surface of a base sheet 1. The protective layer 2 and the adhesive layer 3 are layers that are transferred to a transfer medium during thermal transfer. Hereinafter, in the present invention, layers transferred to a transfer medium during thermal transfer may be collectively referred to as a transfer layer 4.

  FIG. 2 shows another embodiment which is the transfer sheet 10 of the present invention. The transfer sheet 10 of the present invention has a configuration in which a transfer layer 4 in which a release layer 5, a protective layer 2, and an adhesive layer 3 are sequentially laminated is provided on one surface of a substrate sheet 1. The release layer 5 can be provided in order to improve the releasability of the transfer layer 4 from the base sheet 1. The release layer 5 is an arbitrary layer in the transfer sheet 10 of the present invention.

Hereinafter, each layer constituting the transfer sheet 10 of the present invention will be described in detail.
(Substrate sheet)
The base sheet 1 in the transfer sheet has a breaking strength at 25 ° C. of 400 MPa or more and 500 MPa or less in any direction of MD (film length direction) and TD (film width direction), and elongation at break. Is made of 70% or more and 90% or less of a plastic film.
The breaking strength is more preferably 420 MPa or more and 480 MPa or less, and the breaking elongation is more preferably 74% or more and 80% or less.
The above breaking strength and breaking elongation are values measured according to JIS C 2151: 1990.

According to the substrate sheet 1 of the present invention, heat energy at the time of thermal transfer is efficiently transmitted, so that the transfer layer is transferred onto the transfer target body without being deteriorated in surface glossiness because of excellent high-speed printing suitability. Can be made and has excellent durability.
When the breaking strength is less than 400 MPa, when the thermal transfer is performed at a high speed, the transfer layer is likely to break the foil, the transfer surface of the release surface is poor, the surface layer glossiness is lowered, and the sheet is broken. Productivity may be reduced. On the other hand, when the breaking strength exceeds 500 MPa, the processability of the base sheet tends to be lowered.
Further, when the elongation at break is less than 70%, there is a tendency that breakage is likely to occur during thermal transfer at high speed. On the other hand, if the elongation at break exceeds 90%, wrinkles are likely to occur during thermal transfer at high speed, and it tends to be difficult to stably transfer the transfer layer.

  The base sheet 1 is, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene terephthalate-isophthalate copolymer, terephthalic acid-cyclohexanedimethanol-ethylene glycol copolymer, polyethylene terephthalate / polyethylene that satisfies the above conditions. Polyester films such as co-extruded films of naphthalate, aliphatic polyamide films such as nylon 6 and nylon 66, aromatic polyamide films such as Kepler and Nomex, polyolefin films such as polyethylene, polypropylene and polymethylpentene, poly Vinyl film such as vinyl chloride, acrylic film such as polyacrylate, polymethacrylate and polymethylmethacrylate Polyimide, polyimide, polyetherimide and other imide films, polyarylate, polysulfone, polyethersulfone, polyphenylene ether, polyphenylene sulfide (PPS), polyaramide, polyetherketone, polyethernitrile, polyetheretherketone, polyethersulfite Engineering films such as polycarbonate, polystyrene, high-impact polystyrene, AS resins, ABS resins, and other styrene films, cellophane, cellulose acetate, cellulose films such as nitrocellulose, and the like.

ここで、Ａｒ₁、Ａｒ₂、Ａｒ₃は、例えば一般式化３に示すようなものが用いられ、Ｘ、Ｙは、−Ｏ−、−ＣＨ₂−、−ＣＯ−、−ＳＯ₂−、−Ｓ−、−Ｃ（ＣＨ₃）₂−などから選ばれるが、これらに限定されるものではない。

なお、上記の芳香族系ポリアミドフィルムは、芳香環上の水素原子の一部が、フッ素や臭素、塩素などのハロゲン基、ニトロ基、メチル基、エチル基、プロピル基などのアルキル基、メトキシ基、エトキシ基、プロポキシ基などのアルコキシ基などの置換基で置換されていてもよく、また、重合体を構成するアミド結合中の水素が他の置換基によって置換されていてもよい。 The substrate sheet 1 may be a laminated sheet composed of a single layer or a plurality of layers of a copolymer resin or a mixture (including an alloy) containing the above resin as a main component. Moreover, although a base film may be a stretched film or an unstretched film, it is preferable to use a film stretched in a uniaxial direction or a biaxial direction for the purpose of improving strength. Among the above-described base materials made of resin, an aromatic polyamide film is more preferable because it is excellent in heat resistance, mechanical strength, and high-speed printing suitability.
The aromatic polyamide film contains a repeating unit represented by at least one of the following general formula 1 and general formula 2 in the form of polymerization by homopolymerization or copolymerization, preferably 50 mol% or more, preferably 70 mol% or more. Is desirable.

Here, Ar ₁ , Ar ₂ , Ar ₃ are, for example, those shown in the general formula 3, and X and Y are —O—, —CH ₂ —, —CO—, —SO ₂ —, It is selected from —S—, —C (CH ₃ ) ₂ — and the like, but is not limited thereto.

In the above aromatic polyamide film, some of the hydrogen atoms on the aromatic ring are halogen groups such as fluorine, bromine and chlorine, alkyl groups such as nitro group, methyl group, ethyl group and propyl group, and methoxy groups. , An alkoxy group such as an ethoxy group or a propoxy group may be substituted with a substituent such as an alkoxy group, and hydrogen in an amide bond constituting the polymer may be substituted with another substituent.

  Although the base material sheet 1 usually has a thickness of about 2.5 μm to 50 μm, a base material sheet having a thickness of 2.5 μm to 25 μm can be more suitably used. If the thickness of the base sheet is less than 2.5 μm, the mechanical strength may be insufficient and the transfer layer may not be supported. On the other hand, when the thickness of the substrate sheet exceeds 50 μm, although the mechanical strength is high, the transfer of thermal energy at the time of transferring the transfer layer from the transfer sheet becomes insufficient and the transferability tends to be lowered.

  In the case where a release layer is provided on the surface of the base sheet 1, a corona discharge treatment, a plasma treatment, an ozone treatment, a flame treatment, a primer (anchor coat, an adhesion promoter, an easy adhesive) is previously provided on the surface on which the release layer is provided. (Also referred to as application), pre-heat treatment, dust removal treatment, vapor deposition treatment, alkali treatment, etc. may be performed.

The protective layer 2 is a layer for protecting the image of the printed material after being transferred to the transfer target as a part of the transfer layer constituting the transfer sheet.
As the binder resin of the protective layer used in the present invention, polyester resin, polyester urethane resin, polycarbonate resin, acrylic resin, ultraviolet absorbing resin, epoxy resin, acrylic urethane resin, a resin obtained by modifying each of these resins with silicone, A mixture of these resins, ionizing radiation curable resin, etc. can be mentioned.
Especially, in this invention, polyester-type resins, such as a polyester resin and a polyester urethane resin, can be used conveniently. The polyester resin or polyester urethane resin may be a copolymer with another thermoplastic resin.

  Although there is no limitation in particular about content of the binder resin which comprises the protective layer 2, when content of binder resin is less than 20 mass% with respect to the solid content total amount of a protective layer, foil cutting property and durability are It tends to decrease. Therefore, considering this point, the binder resin is preferably contained in an amount of 20% by mass or more, and more preferably 30% by mass or more, based on the total solid content of the protective layer. There is no limitation in particular about the upper limit of content of binder resin, and the upper limit is 100 mass%.

  As the ultraviolet absorbing resin, for example, a resin obtained by reacting and bonding a reactive ultraviolet absorbent to a thermoplastic resin or the above ionizing radiation curable resin can be used. More specifically, addition-polymerizable double-reactive organic UV absorbers such as salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, nickel chelates, hindered amines, etc. Examples thereof include a bond (for example, a vinyl group, an acryloyl group, a methacryloyl group, etc.), an alcoholic hydroxyl group, an amino group, a carboxyl group, an epoxy group, and a reactive group such as an isocyanate group.

  In addition to the binder resin, the protective layer 2 of the present invention may contain other materials such as various fillers, fluorescent brightening agents, and ultraviolet absorbers for improving weather resistance.

  The protective layer is provided on the base sheet with the above-described thermoplastic resin as a main component, and the protective layer can be formed of only one layer, but can be formed of two or more layers. In this case, the plurality of protective layers can be formed of a coating liquid mainly composed of the same thermoplastic resin, or can be formed of a coating liquid mainly composed of different thermoplastic resins. When the protective layer has three layers, for example, are two layers formed of a coating liquid mainly composed of the same thermoplastic resin, and the remaining one layer is formed of a coating liquid mainly composed of a different thermoplastic resin? Alternatively, all three layers can be formed with a coating liquid mainly composed of the same thermoplastic resin, or all three layers can be formed with a coating liquid mainly composed of different thermoplastic resins.

  The protective layer is mainly composed of the above thermoplastic resin, dissolved or dispersed in an appropriate organic solvent to prepare a protective layer coating solution, and this is applied to a base sheet (provided on the base sheet if necessary) It can be formed by applying and drying on the release layer) by a conventionally known means such as a gravure printing method, a screen printing method or a reverse coating method using a gravure plate. The thickness of the protective layer is preferably 2 μm to 15 μm in a dry state under the constitutional condition of only one layer. When the thickness of the protective layer is less than 2 μm, the durability tends to decrease. On the other hand, when the thickness of the protective layer is greater than 15 μm, the foil breakability of the protective layer decreases, Obiquity or the like is likely to occur during thermal transfer to the transfer target.

(Adhesive layer)
The adhesive layer 3 positioned on the outermost surface of the transfer sheet of the present invention has a function of adhesiveness to the transfer target when the transfer layer is transferred to the transfer target. Moreover, it can have the function of the adhesive layer and the function of the receiving layer having the acceptability of the sublimation dye. In any case, the adhesive layer is preferably composed mainly of an organic solvent-soluble thermoplastic resin.
Examples of the thermoplastic resin for the adhesive layer include polyolefin resins such as polypropylene, halogenated resins such as polyvinyl chloride and polyvinylidene chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, and ethylene-vinyl acetate copolymer. Polymer vinyl resins, polyacrylate resins, polyester resins such as polyethylene terephthalate or polybutylene terephthalate, polystyrene resins, polyamide resins, copolymers of olefins such as ethylene or propylene, and other vinyl polymers, ionomers Alternatively, cellulose resins such as cellulose diastase, polycarbonate and the like can be mentioned, and vinyl resins and polyester resins are particularly preferable.

When the adhesive layer is used as an intermediate transfer recording medium with dye receptivity, a thermal transfer sheet having a dye layer containing a sublimable dye on the substrate is used to sublimate the adhesive layer of the intermediate transfer recording medium. When forming an image by transfer, a release agent is added to the above thermoplastic resin in order to provide a release property between the intermediate transfer recording medium and the thermal transfer sheet. As the mold release agent, silicone oil, phosphate ester surfactants, fluorine compounds and the like can be used, and among these, silicone oil is particularly preferably used. However, in order to prevent the release agent from deteriorating the adhesion to the transfer target, it is preferable to use the specific release agent described below and to add it in a predetermined range. Examples of the specific release agent include side chain aralkyl-modified silicone and side chain epoxy-modified silicone. The release agent is not only added to the adhesive layer as a single type, but it is preferable to add two or more types of release agents in order to provide sufficient release properties during thermal transfer with the thermal transfer sheet.
Specifically, when the side chain type aralkyl-modified silicone and the side chain type epoxy-modified silicone are added together, the two release agents are combined in an amount of 1% by mass to 5% by mass with respect to the total mass of the adhesive layer. It is preferable to add.

  The adhesive layer is dissolved or dispersed in an appropriate solvent such as an organic solvent by adding one or a plurality of resin materials selected from the materials exemplified above and, if necessary, the release agent described above. Thus, a coating solution for the adhesive layer can be prepared, and this can be formed by applying and drying by means of a gravure printing method, a screen printing method or a reverse coating method using a gravure plate. The thickness of the adhesive layer is not particularly limited, but is usually about 1 μm to 10 μm in a dry state.

(Peeling layer)
In the transfer sheet of the present invention, the release layer 5 can be provided between the base sheet and the transfer layer so that the transfer layer is easily peeled off from the base sheet during thermal transfer. The release layer is a layer that is transferred onto the transfer target during thermal transfer.
Examples of the release layer material include cellulose derivatives such as ethyl cellulose, nitrocellulose, and cellulose acetate, acrylic resins such as polymethyl methacrylate, polyethyl methacrylate, and polybutyl acrylate, polyvinyl chloride, and vinyl chloride-vinyl acetate. Thermosetting resins such as copolymers, thermoplastic resins of vinyl copolymers such as polyvinyl butyral, saturated or unsaturated polyester resins, polyurethane resins, thermally crosslinkable epoxy-amino resins, amino alkyd resins, silicone waxes, Examples thereof include a silicone resin, a silicone-modified resin, a fluorine resin, a fluorine-modified resin, and polyvinyl alcohol. The release layer preferably contains a filler such as microsilica or polyethylene wax in order to improve the foil breakability. Further, the release layer may be made of one kind of resin, or may be made of two or more kinds of resins. The release layer may be formed using a crosslinking agent such as an isocyanate compound, a catalyst such as a tin-based catalyst, and an aluminum-based catalyst in addition to the resin exemplified above.

  The release layer formed as necessary is dispersed or dissolved in the above resin in a solvent, and applied to at least a part on the base sheet by a known coating method such as roll coating, gravure coating, bar coating, It can be formed by drying. The thickness of the release layer is usually about 0.1 μm to 5 μm, preferably about 0.5 μm to 2 μm, after drying.

(Heat resistant slipping layer)
The transfer sheet of the present invention can be provided with a heat-resistant slip layer on the back surface of the base sheet. The heat resistant slipping layer provided on the back surface of the base material sheet is provided for the purpose of preventing thermal fusion between a heating device such as a thermal head and the base material sheet and running smoothly.
Examples of the resin for forming the heat resistant slipping layer include polyvinyl butyral resin, polyvinyl acetoacetal resin, polyester resin, vinyl chloride-vinyl acetate copolymer, polyether resin, polybutadiene resin, styrene-butadiene copolymer, acrylic polyol. , Polyurethane acrylate, polyester acrylate, polyether acrylate, epoxy acrylate, urethane or epoxy prepolymer, nitrocellulose resin, cellulose nitrate resin, cellulose acetopropionate resin, cellulose acetate butyrate resin, cellulose acetate hydrodiene phthalate resin, Cellulose acetate resin, polyamide resin, polyimide resin, polyamideimide resin, polycarbonate resin, chlorinated polyolefin resin, Fluorinated polyolefin resins.

  The slipperiness imparting agent added to or overcoated with the heat resistant slipping layer made of these resins includes phosphate ester, silicone oil, graphite powder, silicone graft polymer, fluorine graft polymer, acrylic silicone graft polymer, acrylic siloxane, aryl Examples thereof include silicone polymers such as siloxane, but a layer made of a polyol, for example, a polyalcohol polymer compound, a polyisocyanate compound, and a phosphate ester compound, and a filler is more preferably added. The heat resistant slipping layer is prepared by dissolving or dispersing the above-described resin, slipperiness imparting agent, and filler with an appropriate solvent to prepare a heat resistant slipping layer forming ink. It can apply | coat to the back surface of a material sheet | seat by forming means, such as the reverse coating method using a gravure printing method, a screen printing method, and a gravure plate, and can dry and form. The coating amount of the heat-resistant slipping layer is sufficient as long as it can prevent fusion, lubricity, and the like, and is usually about 0.1 μm to 3 μm at the time of drying.

(Transfer)
The transfer layer constituting the transfer sheet according to the present invention described above is transferred onto the transfer target, and as a result, a printed matter having a thermal transfer image excellent in durability and glossiness is obtained.
The transfer target to which the transfer sheet of the present invention is applied is not particularly limited. For example, natural fiber paper, coated paper, tracing paper, plastic film that is not deformed by heat during transfer, glass, metal, ceramics, wood, cloth, etc. Any one is acceptable.

  Regarding the shape and application of the transferred object, stock certificates, securities, certificates, passbooks, boarding tickets, car horse tickets, stamps, stamps, appreciation tickets, admission tickets, tickets, etc., cash cards, credit cards, prepaid cards, Cards such as members cards, greeting cards, postcards, business cards, driver's licenses, IC cards, optical cards, cases such as cartons, containers, bags, forms, envelopes, tags, OHP sheets, slide films, bookmarks, Calendars, posters, brochures, menus, POP supplies, coasters, displays, nameplates, keyboards, cosmetics, wristwatches, lighters and other accessories, stationery, report paper and other stationery and passports, small books, magazines and other booklets, building materials, Panel, emblem, key, cloth, clothing, footwear, radio, TV, calculator, O Device such as equipment, various swatches, album also, the output of computer graphics, medical image output, etc., do not ask type.

Next, the present invention will be described more specifically with reference to examples. Hereinafter, unless otherwise specified, parts or% is based on mass.
Example 1
As the substrate sheet 1, an aromatic polyamide film (Mikutron manufactured by Toray Industries, Inc.) having a breaking strength of 420 MPa, a breaking elongation of 80%, and a thickness of 4 μm was used.
First, a primer layer coating solution for a heat resistant slipping layer having the following composition was applied and dried in advance on one surface of the base sheet 1 so that the thickness was 0.2 μm when dried, and the following heat resistant slipping was applied to the surface of the primer layer. After applying and drying the adhesive layer coating solution to 1.0 μm when dried, a heat treatment was performed at 60 ° C. for 5 days to form a heat resistant slipping layer.
Next, a protective layer / peeling layer forming coating solution having the following composition is applied to the other surface of the substrate sheet 1 by a bar coater method so as to be 1.0 μm after drying. Formed. Next, a coating solution for forming an adhesive layer having the following composition was applied onto the release layer by a bar coater method so as to have a thickness of 2.0 μm after drying, and the adhesive layer 3 was formed by drying. A transfer sheet 10 (protective layer transfer sheet) was obtained.

<Primer layer coating solution for heat resistant slipping layer>
10.0 parts of polyester resin (Nichigo Polyester LP-035; manufactured by Nippon Synthetic Chemical Industry Co., Ltd.)
Methyl ethyl ketone 90.0 parts

<Heat resistant slipping layer coating solution>
13.6 parts of polyvinyl butyral resin (manufactured by SREC BX-1 by Sekisui Chemical Co., Ltd.)
0.6 parts of polyisocyanate curing agent (Takenate D218, Takeda Pharmaceutical Company Limited)
Phosphate 0.8 parts (Pricesurf A208N, Daiichi Kogyo Seiyaku Co., Ltd.)
Methyl ethyl ketone 42.5 parts Toluene 42.5 parts

<Protective layer / peeling layer forming coating solution>
・ Acrylic resin 100 parts (BR-87 (Mitsubishi Rayon Co., Ltd.)
・ Toluene 200 parts ・ MEK (methyl ethyl ketone) 200 parts

<Coating liquid for forming the adhesive layer>
・ 100 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL, manufactured by Nissin Chemical Industry Co., Ltd.)
・ Toluene 200 parts ・ MEK (methyl ethyl ketone) 200 parts

(Comparative Example 1)
Except for changing the base sheet 1 to a polyethylene terephthalate film (product name, Lumirror, manufactured by Toray Industries, Inc.) having a breaking strength of 250 MPa, a breaking elongation of 130%, and a thickness of 4.0 μm, all the same procedures as in Example 1 were performed. Thus, a transfer sheet 10 (protective layer transfer sheet) of Comparative Example 1 was obtained.

(Printed matter)
Using a digital photo printer CX (manufactured by Citizen Systems Co., Ltd.) equipped with a commercially available thermal head, heat is applied from the heat-resistant slipping layer side using the dedicated thermal transfer ink sheet and thermal transfer image-receiving sheet for the printer to form a printed matter. did. However, the protective layer / peeling layer was formed using the protective layer transfer sheet prepared in Example 1 and Comparative Example 1 instead of the protective layer transfer sheet portion of the printer dedicated thermal transfer ink sheet.

(Example 2)
As the base sheet 1, an aromatic polyamide film (Miktron manufactured by Toray Industries, Inc.) having a breaking strength of 440 MPa, a breaking elongation of 74%, and a thickness of 9 μm was used.
First, the release layer forming coating solution having the above composition was applied to one surface of the base sheet 1 by a bar coater method so as to be 1.0 μm after drying, and the release layer 5 was formed by drying. Next, a protective layer-forming coating solution having the following composition was applied onto the release layer by a bar coater method so as to have a thickness of 1.0 μm after drying, thereby forming a protective layer 2. Next, a receiving layer / adhesive layer forming coating solution having the following composition is applied onto the protective layer by a bar coater method so as to be 2.0 μm after drying, and then the receiving layer / adhesive layer 3 is formed. Thus, a transfer sheet 10 (intermediate transfer recording medium) of Example 2 was obtained.

<Coating liquid for forming protective layer>
-Polyester resin 20 parts (UE-9200, manufactured by Unitika Ltd. number average molecular weight 15000, Tg = 65 ° C.)
・ Toluene 40 parts ・ MEK (methyl ethyl ketone) 40 parts

<Coating liquid for forming receptor layer / adhesive layer>
・ 98 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) CNL, manufactured by Nissin Chemical Industry Co., Ltd.)
・ Epoxy-modified silicone oil 2 parts (KP-1800U, Shin-Etsu Chemical Co., Ltd.)
・ Toluene 200 parts ・ MEK (methyl ethyl ketone) 200 parts

(Comparative Example 2)
Except for changing the base sheet 1 to a PET film having a breaking strength of 420 MPa, a breaking elongation of 80%, and a thickness of 4 μm (product name, Miktron manufactured by Toray Industries, Inc.) A transfer sheet 10 (intermediate transfer recording medium) was obtained.

(Printed matter)
The rear surface of the transfer sheet 10 using the printer-specific ink ribbon and the transfer sheet 10 of Example 2 and Comparative Example 2 (intermediate transfer recording medium) using a commercially available HDP-600 printer (manufactured by HID). Heating was performed from the side, and a sublimation transfer photographic image and a melt transfer character image heat transfer image were formed on the receiving layer and adhesive layer of the intermediate transfer recording medium.
Next, the transfer layer (peeling layer, protective layer, receiving layer / adhesive layer) of the intermediate transfer recording medium on which the image has been formed is placed on a vinyl chloride card, which is a transfer target, at a predetermined position, and a heat roll is formed. And reprinted to obtain prints of Example 2 and Comparative Example 2.

<Evaluation of coating film stability>
The prints of Examples 1 and 2 and Comparative Examples 1 and 2 obtained above were stored in an environment of 40 ° C. and 90% RH for 48 hours, and the prints after storage were visually checked for cracks. The coating film stability was evaluated according to the following evaluation criteria. The evaluation results are shown in Table 1.

<Evaluation criteria>
3 ... No cracks 2 ... Slightly small cracks 1 ... Small large cracks

<Foil breakability (Obiki) test>
Confirmation of the foil cutting property (Obiki) of the printed matter of Examples 1-2 and Comparative Examples 1-2 obtained above was performed visually, and evaluation was performed according to the following evaluation criteria.
The amount of creaking means the length of the transfer layer that starts from the boundary between the transfer area and the non-transfer area of the transfer layer and protrudes from the boundary to the non-transfer area side.

<Evaluation criteria>
3 ... The amount of creaking is less than 0.1 mm.
2 ... The amount of creaking is 0.1 mm or more and less than 1 mm.
1 ... The amount of crease is 1 mm or more.

<Glossiness>
A digital photo printer CX (manufactured by Citizen Systems Co., Ltd.) equipped with a commercially available thermal head is used to print a print using the dedicated thermal transfer ink sheet and thermal transfer image-receiving sheet for the printer (the print pattern is black on the right side and solid on the left side) ) Was formed. However, the protective layer is formed by using the protective layer transfer sheet prepared in Example 1 and Comparative Example 1 instead of the protective layer transfer sheet portion of the dedicated thermal transfer ink sheet for a printer. The print was obtained.
The rear surface of the transfer sheet 10 using the printer-specific ink ribbon and the transfer sheet 10 of Example 2 and Comparative Example 2 (intermediate transfer recording medium) using a commercially available HDP-600 printer (manufactured by HID). Heating was performed from the side, and a sublimation transfer photographic tone image (the printing pattern was solid on the right half side and solid on the left side) was formed on the receiving layer / adhesive layer of the intermediate transfer recording medium.
Next, the transfer layer (peeling layer, protective layer, receiving layer / adhesive layer) of the intermediate transfer recording medium on which the image has been formed is placed on a vinyl chloride card, which is a transfer target, at a predetermined position, and a heat roll is formed. And reprinted to obtain prints of Example 2 and Comparative Example 2.

Using the gloss meter (Nippon Denshoku Co., Ltd. Gloss Meter VG2000) for each of the black solid portion and the white solid portion in the printed matter of Examples 1-2 and Comparative Examples 1-2 obtained above, the measurement incident angle The measurement was performed at 20 ° under the conditions of the measurement direction MD (main scanning direction) and TD (sub-scanning direction). The printing environment is normal temperature and normal humidity.

<Evaluation criteria>
2 ... Glossiness is 80 or more 1 ... Glossiness is less than 80

Table 1 shows the evaluation results of the above-mentioned coating film stability, foil breakability and glossiness.

<Result>
As shown in Table 1, in Examples 1 and 2, the coating film stability and the glossiness were both as good as when the energy in transfer was high when the energy in transfer was low. Moreover, in Examples 1-2, generation | occurrence | production of ubiquitous was not recognized and foil cutting | disconnection property was favorable.
On the other hand, in Comparative Examples 1 and 2, the coating film stability and glossiness were based on the base sheet having a breaking strength of 400 MPa or more and 500 MPa or less and a breaking elongation of 70% or more and 90% or less. Since it is a material sheet, when the energy in transfer is low compared to the case where the energy in transfer is high, the coating film stability and the glossiness are inferior. Moreover, in the comparative examples 1 and 2, compared with the Example, it became a result in which foil cutting property was inferior.

DESCRIPTION OF SYMBOLS 1 Base material sheet 2 Protective layer 3 (Receptive layer) Adhesive layer 4 Transfer layer 5 Release layer 10 Transfer sheet

Claims (2)

A transfer sheet having a transfer layer in which at least a protective layer and an adhesive layer are laminated in this order on a base sheet, and transferring the transfer layer onto a transfer target,
The transfer sheet, wherein the base sheet is made of a plastic film having a breaking strength of 400 MPa or more and 500 MPa or less and a breaking elongation of 70% or more and 90% or less. The transfer sheet according to claim 1, wherein the base sheet is an aromatic polyamide film.

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