JP2019055573A - Seal-type thermal transfer image receiving sheet - Google Patents

Abstract

To provide a seal-type thermal transfer image receiving sheet capable of decreasing an attached amount of an adhesive originated from an adhesive layer to a cutter in comparison to before when cutting by a cutter.SOLUTION: The seal-type thermal transfer image receiving sheet includes: a release sheet part containing a back side base material layer; and a seal base material part obtained by laminating an adhesive layer, a front side base material layer, and an acceptance layer in this order from the surface of the release sheet part, and provided releasably from the release sheet part, where the front side base material layer is a single layer structure composed of a layer of singularity, or a laminate structure obtained by laminating two or more of layers, (A) in the case of the single layer structure, the tensile breaking strength (JIS C2151) in a TD direction of the single layer is 195 MPa or more, and (B) in the case of the laminate structure, the tensile breaking strength (JIS C2151) in a TD direction of a layer located so as to contact the adhesive layer of the two or more layers is 195 MPa or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seal-type thermal transfer image receiving sheet.

  2. Description of the Related Art Conventionally, thermal transfer printing has been performed in which a thermal transfer sheet and a transfer target are overlapped and a color material on the thermal transfer sheet is transferred to the transfer target.

  As a transfer medium used in such a thermal transfer printing, there is a seal-type thermal transfer image receiving sheet as disclosed in Patent Document 1 and Patent Document 2, for example.

Japanese Patent Laying-Open No. 2015-0398847 Japanese Patent Laying-Open No. 2015-033787

  Such a seal-type thermal transfer image-receiving sheet is often set in a printer in a rolled state, printed, and then cut and discharged by a cutter built in the printer. In the conventional seal-type thermal transfer image-receiving sheet, the adhesive material derived from the adhesive material layer constituting the sticking material adheres to the cutter, and the cutter may become dull. The cutter to which the adhesive material was attached had to be replaced, and the more the adhesive material was attached, the more frequently the cutter had to be replaced, resulting in a decrease in yield and high cost.

  The present invention has been made under such circumstances, and when cut by a cutter, a seal-type thermal transfer that can reduce the amount of adhesion of an adhesive material derived from an adhesive material layer to the cutter as compared to the prior art. The main problem is to provide an image receiving sheet.

  In the present invention for solving the above-mentioned problem, a release sheet part including a back side base material layer, and an adhesive material layer, a front side base material layer, and a receiving layer are laminated in this order from the surface of the release sheet part. A seal-type thermal transfer image-receiving sheet that is detachable from the release sheet portion, wherein the front-side substrate layer is a single-layer structure consisting of a single layer, or two or more And (A) when exhibiting a single layer structure, the tensile breaking strength (JIS C2151) in the TD direction of the single layer is 195 MPa or more, (B) When exhibiting a laminated structure, the tensile rupture strength (JIS C2151) in the TD direction of the layer located in contact with the adhesive material layer among the two or more layers is 195 MPa or more. To do.

  In the present invention, the front substrate layer has a laminated structure in which two or more layers are laminated, and the total light transmittance of a layer located on the receiving layer side among the two or more layers. (JIS K7105) may be 90% or more.

  According to the seal-type thermal transfer image-receiving sheet of the present invention, the tensile breaking strength (JIS C2151) in the TD direction of the layer located in contact with the pressure-sensitive adhesive layer that causes the sharpness of the cutter to be dull is 195 MPa or more. When it cuts with a cutter, the adhesion amount to the cutter of the adhesive material derived from an adhesive material layer can be reduced compared with the past. In addition, it is not necessarily clear why the adhesion amount of the adhesive material to the cutter can be reduced by setting the tensile breaking strength (JIS C2151) in the TD direction of the layer located in contact with the adhesive material layer to 195 MPa or more. However, if the tensile strength at break (JIS C2151) is smaller than 195 MPa, it can be assumed that the layer of the cut surface is easily broken and adheres to the cutter together with the adhesive layer when cut by the cutter. That is, it can be assumed that a layer having a high tensile strength at break (JIS C2151) hardly extends even when the layer itself receives stress, and as a result, it is difficult to adhere to the cutter together with the adhesive material.

1 is a schematic cross-sectional view of a seal-type thermal transfer image receiving sheet according to a first embodiment of the present invention. It is a schematic sectional drawing of the seal type thermal transfer image receiving sheet concerning 2nd Embodiment of this invention.

  Hereinafter, a seal-type thermal transfer image-receiving sheet according to an embodiment of the present invention will be described with reference to the drawings. In the drawings, for convenience of illustration and easy understanding, the scale and vertical / horizontal dimension ratios may be appropriately changed and exaggerated from those of the actual product.

(Seal type thermal transfer image receiving sheet according to the first embodiment)
FIG. 1 is a schematic sectional view of a seal-type thermal transfer image receiving sheet according to the first embodiment of the present invention.

  As shown in FIG. 1, the seal-type thermal transfer image receiving sheet 100 according to the first embodiment includes a release sheet part 10 and a seal base part 20, and the seal base part 20 is a release sheet part 10. It is provided so as to be peelable from.

-Release sheet part As shown in FIG. 1, the release sheet part 10 in the seal-type thermal transfer image-receiving sheet 100 according to the first embodiment is formed on one surface (the upper surface in FIG. 1) of the back-side base material layer 11. It has a three-layer structure in which a release layer 12 is provided and a back layer 13 is provided on the other surface (the lower surface in FIG. 1). In addition, the release sheet part 10 should just contain the back side base material layer 11, and the release layer 12 and the back surface layer 13 which are shown in FIG. 1 are arbitrary layers. Moreover, the release sheet part 10 may include various functional layers having other functions separately from or in addition to the release layer 12 and the back surface layer 13.

-Back side base material layer There is no limitation about the material of the back side base material layer 11 which is an essential layer which comprises the release sheet part 10, A conventionally well-known material can be selected suitably and can be used. For example, stretched or unstretched plastic films such as polyethylene terephthalate and polyethylene naphthalate, polypropylene, polycarbonate, cellulose acetate, polyethylene derivatives, polyamide, polymethylpentene, high quality paper, coated paper, art paper , Cast coated paper, paperboard, emulsion-impregnated paper, synthetic rubber latex-impregnated paper, synthetic resin-added paper, cellulose fiber paper, and the like.

  Moreover, as the back side base material layer 11, a layer having microvoids inside can also be used. As an example of the layer having a microvoid inside, a polyolefin resin layer having a microvoid inside can be cited. Polyolefin resins such as polyethylene, polyethylene terephthalate, polyethylene naphthalate and other highly heat-resistant polyester, polypropylene, polybutene, polyisobutene, polyisobutylene, polybutadiene, polyisoprene, ethylene-vinyl acetate copolymer, etc. Can be mentioned.

  As a polyolefin resin layer having microvoids, microvoids (fine vacancies) can be generated inside by the following two methods. One is a method in which inorganic fine particles are kneaded in a polymer, and when the compound is stretched, microvoids are generated using the inorganic fine particles as nuclei. The other is to create a compound blended with an incompatible polymer (one or more types) for the main resin. When this compound is viewed microscopically, the polymers form a fine sea-island structure. When this compound is stretched, microvoids are generated due to separation of the sea-island interface or large deformation of the polymer forming the island.

  In addition, although the back side base material layer 11 shown in FIG. 1 is a single layer which consists of said various materials, it is not limited to this, Although not shown in figure, it is 2 types of said various materials You may exhibit the laminated structure formed by laminating | stacking the above. In this case, the layers may be bonded with a conventionally known adhesive.

  The thickness of the back side base material layer 11 is not particularly limited, and can be appropriately designed according to the application and required performance. For example, it is good also as 50 to 150 micrometers.

-Release layer In the release sheet part 10 shown in FIG. 1, the release layer 12 is provided in one surface (upper surface in FIG. 1) of a back side base material layer. By providing the release layer 12, it is possible to improve the release property of the sealing base material portion 20 from the release sheet portion 10.

  The material of the release layer 12 is not particularly limited, but various resins, specifically, waxes, silicone waxes, silicone resins, silicone modified resins, fluorine resins, fluorine modified resins, polyvinyl alcohol, acrylic resins And heat-crosslinkable epoxy-amino resins and heat-crosslinkable alkyd-amino resins. Moreover, the release layer 12 may be made of one kind of resin, or may be made of two or more kinds of resins. Further, the release layer 12 may be formed using a crosslinking agent such as an isocyanate compound, a catalyst such as a tin catalyst, and an aluminum catalyst in addition to the resin.

  The thickness of the release layer 12 is generally about 0.1 μm to 5 μm. As a method for forming the release layer 12, a release layer coating solution is prepared by dissolving or dispersing the above resin in an appropriate solvent, and this is applied to the backside base material layer 11 by gravure printing or screen printing. It can be formed by coating and drying by a conventionally known means such as a reverse coating method using a method or a gravure plate.

  Further, in place of providing the release layer 12, the back side base material layer 1 may contain a release material to give the back side base material layer 11 itself a release property. Examples of the release material include solid waxes such as polyethylene wax, amide wax, and Teflon (registered trademark) powder, fluorine-based or phosphate-based surfactant, silicone oil, reactive silicone oil, and curable silicone oil. Examples include various modified silicone oils and various silicone resins.

-Back surface layer In the release sheet part 10 shown in FIG. 1, the back surface layer 13 is provided in the other surface (lower surface in FIG. 1) of the back side base material layer 11. In FIG. By providing the back layer 13, the transportability of the seal-type thermal transfer image receiving sheet 100 can be improved.

  Examples of the back layer 13 include resins such as acrylic resins, cellulose resins, polycarbonate resins, polyvinyl acetal resins, polyvinyl alcohol resins, polyvinyl butyral resins, polyamide resins, polystyrene resins, polyester resins, and halogenated polymers. As additives, nylon fillers, acrylic fillers, polyamide fillers, fluorine fillers, polyethylene wax, organic fillers such as amino acid powders, and inorganic fillers such as silicon dioxide and metal oxides are used. can do. Moreover, what hardened | cured these resins with hardening | curing agents, such as an isocyanate compound and a chelate compound, can also be used. The thickness of the back layer 13 is generally about 0.1 μm or more and 5 μm or less.

-Seal base part As shown in Drawing 1, seal base part 20 in seal type thermal transfer image receiving sheet 100 concerning a 1st embodiment is from the surface (the upper surface in Drawing 1) side of said release sheet part 10. The pressure-sensitive adhesive layer 21, the front-side base material layer 22, the primer layer 25, and the receiving layer 23 have a laminated structure in which they are laminated in this order.

-Adhesive material layer There is no limitation about the material of the adhesive material layer 21, and a conventionally well-known solvent type or aqueous adhesive material can be used. Examples of the adhesive material include vinyl acetate resin, acrylic resin, vinyl acetate-acrylic copolymer, vinyl acetate-vinyl chloride copolymer, ethylene-vinyl acetate copolymer, ethylene acrylic acid copolymer, ethylene-acrylic acid. Examples include ester copolymers, polyurethane resins, natural rubber, chloroprene rubber, and nitrile rubber.

  Considering the improvement in the peelability of the sealing base material part 20 from the release sheet part 10, the adhesive strength of the adhesive material layer 21 is the peel strength between the release sheet part 10 and the adhesive material layer 21, and conforms to JIS Z0237. In the peeling method at 180 °, it is desirable that the range is 0.98N or more and 16.7N or less, preferably 4.9N or more and 13.7N or less. Therefore, in forming the adhesive material layer 21, it is preferable to use the material and the coating amount as appropriate so that the peel strength is within this range.

  For the adhesive material layer 21, for example, a coating liquid for an adhesive material layer in which the above-mentioned adhesive material is dissolved or dispersed in an appropriate solvent is used on the release sheet portion 10 by a gravure printing method, a screen printing method, or a gravure plate. It can form by apply | coating and drying by well-known means, such as a reverse roll coating printing method. Although there is no limitation in particular about the thickness of the adhesive material layer 21, about 5 micrometers or more and 15 micrometers or less are preferable.

-Front side base material layer As shown in Drawing 1, seal base material part 20 in seal type thermal transfer image receiving sheet 100 concerning a 1st embodiment touches adhesive material layer 21, and consists of a single layer. The front side base material layer 22 of the structure is located. And it has the characteristics that the tensile fracture strength (JIS C2151) in the TD direction of this front side base material layer 22 is 195 MPa or more. As described above, when the tensile strength at break (JIS C2151) in the TD direction of the front side base material layer 22 positioned in direct contact with the adhesive material layer 21 is set to 195 MPa or more, when the seal-type thermal transfer image receiving sheet 100 is cut by a cutter. It can suppress that the adhesive material derived from the adhesive material layer 21 adheres to a cutter. Further, from the viewpoint of reducing the replacement frequency of the cutter, it is more preferable that the pressure is 195 MPa or more and 400 MPa or less.

  Here, the TD direction means a direction orthogonal to the flow direction (MD direction) of the seal-type thermal transfer image receiving sheet 100. That is, in the case where the seal-type thermal transfer image receiving sheet 100 according to the embodiment has a long sheet form, the longitudinal direction of the seal-type thermal transfer image receiving sheet 100 is the MD direction, and a direction (width) perpendicular to the MD direction. Direction) is the TD direction.

  Moreover, the tensile strength at break of the front side base material layer 22 can be measured by a method based on JIS C2151. Specifically, it can be obtained as a strength (value obtained by dividing the tensile load value by the cross-sectional area of the test piece) when the sample is pulled (breaked) using a tensile tester at a speed of 200 mm / min.

  About the material which comprises such a front side base material layer 22, it can design suitably on condition that the conditions of the said tensile fracture strength are satisfy | filled. Specifically, polypropylene, polyester, polyarylate, polycarbonate, polyurethane, polyimide, polyetherimide, cellulose derivative, polyethylene, ethylene / vinyl acetate copolymer, polystyrene, acrylic, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, Polyvinyl butyral, nylon, polyether ether ketone, polysulfone, polyether sulfone, tetrafluoroethylene / perfluoroalkyl vinyl ether, polyvinyl fluoride, tetrafluoroethylene / ethylene, tetrafluoroethylene / hexafluoropropylene, polychlorotrifluoroethylene, Examples include various plastics such as polyvinylidene fluoride.

  Even with these materials, the tensile strength at break may change depending on the method of forming the front-side base material layer using the material. For example, when polyethylene terephthalate is used, the tensile strength at break tends to increase as the density increases and the thickness increases. On the other hand, in the case where a foaming agent is added at the time of forming the front side base material layer, since the density becomes small, the value of the tensile strength at break tends to be small.

Primer layer The primer layer 25 constituting the seal substrate portion 20 is provided between the front-side base material layer 22 and the receiving layer 23, and the adhesion and antistatic properties between the front-side base material layer 22 and the receiving layer 23 , And for the purpose of imparting anti-curl properties, etc., and is an arbitrary layer.

  The binder resin used for the primer layer 25 is polyurethane resin, polyester resin, polycarbonate resin, polyamide resin, acrylic resin, polystyrene resin, polysulfone resin, polyvinyl chloride resin, polyvinyl acetate resin, vinyl chloride. -Vinyl acetate copolymer resin, polyvinyl acetal resin, polyvinyl butyral resin, polyvinyl alcohol resin, epoxy resin, cellulose resin, ethylene-vinyl acetate copolymer resin, polyethylene resin, polypropylene resin and the like.

  It is preferable to add a layered silicate to the primer layer 25 in order to impart conductivity. The layered silicate is a compound obtained by reacting sodium, magnesium, and lithium salts with sodium silicate under appropriate conditions.

Receiving layer As shown in FIG. 1, a receiving layer 23 is provided on the primer layer 25. The receiving layer 23 is an essential component in the sealed thermal transfer image receiving sheet 100 used in the present invention.

  The receiving layer 23 contains a binder resin. As the binder resin contained in the receiving layer 23, a conventionally known resin material that can easily receive the dye of the dye layer in the thermal transfer sheet used in combination with the seal-type thermal transfer image receiving sheet 100 according to the present embodiment can be used. For example, polyolefin resin such as polypropylene, halogenated resin such as polyvinyl chloride or polyvinylidene chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer or polyacrylate Vinyl 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, cellulose resins such as ionomers or cellulose diastases And solvent-based resins such as polycarbonate and acrylic resins.

  Further, in place of the solvent-based resin exemplified above, a water-based resin such as a water-soluble resin, a water-soluble polymer, or a water-based resin can be used as the binder resin. According to the receiving layer 23 of the water-based resin, an image having a high printing density can be formed as compared with the solvent-based receiving layer, and the light resistance and glossiness after the image formation can be improved. .

  Examples of the water-soluble resin and water-soluble polymer include polyvinyl pyrrolidone resin, polyvinyl alcohol resin, and gelatin. Examples of the water-based resin include emulsions such as a vinyl chloride resin, an acrylic resin, and a urethane resin, or a resin in which a part of a solvent such as a dispersion is composed of water. The aqueous resin can be formed, for example, by dispersing and preparing a solution containing a solvent-based resin by a method such as a homogenizer.

  Further, the receiving layer 23 may contain a release material for improving the release property with respect to the thermal transfer sheet. As the release material, those described as the release material that can be contained in the back side base material layer 11 of the release sheet portion 10 can be used as they are, and detailed description thereof is omitted here.

  The various binder resins described above are preferably contained in an amount of 50% by mass or more based on the total solid content of the receiving layer 23. In particular, by setting the content of the water-soluble resin, water-soluble polymer, or water-based resin within the above range, high gloss can be imparted to the formed image. The same applies to the case of using other binder resins.

  The method for forming the receiving layer 23 is not particularly limited, and the binder resin described above and various additives added as necessary are dissolved or dispersed in an appropriate solvent such as water or a solvent to form a receiving layer. A coating liquid can be prepared, and this can be formed by coating and drying on the front substrate layer 22 by means such as a gravure printing method, a screen printing method, or a reverse coating method using a gravure plate.

  The thickness of the receiving layer is not particularly limited, but is generally about 1 μm to 10 μm.

(Seal type thermal transfer image receiving sheet according to the second embodiment)
FIG. 2 is a schematic cross-sectional view of a seal-type thermal transfer image receiving sheet according to the second embodiment of the present invention. For convenience of explanation, the same reference numerals are given to the same components as those of the seal-type thermal transfer image receiving sheet 100 according to the first embodiment of the present invention shown in FIG.

  As shown in FIG. 2, the seal-type thermal transfer image receiving sheet 100 according to the second embodiment is formed by laminating two or more front side base material layers 22 (three layers in FIG. 2) in the seal base material portion 20. The present embodiment is different from the seal-type thermal transfer image receiving sheet 100 according to the first embodiment in that it has a laminated structure, and all other configurations are the same as those of the seal-type thermal transfer image receiving sheet 100 according to the first embodiment. is there. Therefore, in the following, only the front-side base material layer 22 will be described, and description of other configurations will be omitted.

-Front side base material layer As shown in Drawing 2, front side base material layer 22 in seal base material part 20 of seal type thermal transfer image receiving sheet 100 concerning a 2nd embodiment is the 1st layer 22A from the adhesive material layer 21 side. The second layer 22B and the third layer 22C are each laminated through an adhesive layer 24. Of the three layers (22A, 22B, 22C) forming the laminated structure, the layer located in contact with the adhesive material layer 21, that is, the tensile breaking strength (JIS C2151) in the TD direction of the first layer 22A is 195 MPa or more. It is characterized by being. As described above, when the seal-type thermal transfer image receiving sheet 100 is cut with a cutter, whether or not the adhesive material derived from the adhesive material layer 21 adheres to the cutter is determined by the breakage of the material of the front substrate that is in contact with the adhesive material layer 21. Where the strength is greatly affected, according to the seal-type thermal transfer image receiving sheet 100 according to the present embodiment, the tensile breaking strength (JIS) in the TD direction of the layer in the position affecting the adhesion of the adhesive material, that is, the first layer 22A. By setting C2151) to 195 MPa or more, the same effect as that of the seal-type thermal transfer image receiving sheet 100 according to the first embodiment can be obtained.

・ First layer 22A
Since the first layer 22A is the same as the front-side base material layer 22 in the seal-type thermal transfer image receiving sheet 100 according to the first embodiment, a description thereof is omitted here.

・ Second layer 22B
The second layer 22B constituting the front-side base material layer 22 is not particularly limited, and functions and performance required for the front-side base material layer 22, and further, functions and performance required for the seal-type thermal transfer image receiving sheet 100, and the like. It can be designed as appropriate in consideration.

  For example, when the front-side base material layer 22 is required to have heat insulation properties, the second layer 22B may be used as a heat insulation layer. As a 2nd layer as a heat insulation layer, the polyolefin-type resin layer which has a micro void inside can be mentioned. As the polyolefin-based resin layer, those described as “a layer having microvoids” in the back-side base material layer 11 of the release sheet portion 10 can be used as they are, and description thereof is omitted here.

  The second layer 22B may be a heat insulating layer having hollow particles in place of the heat insulating layer having microvoids. As the hollow particles, expanded particles or non-expanded particles can be used. Further, the expanded particles used as the hollow particles may be independent expanded particles or continuous expanded particles. Furthermore, the hollow particles may be organic hollow particles composed of resin or the like, or inorganic hollow particles composed of glass or the like. The hollow particles may be cross-linked hollow particles.

  Examples of the resin constituting the hollow particles include styrene resins such as styrene acrylic resins and cross-linked styrene-acrylic resins, (meth) acrylic resins such as acrylonitrile-acrylic resins, phenolic resins, fluorine resins, and polyamide resins. Examples thereof include resins, polyimide resins, polycarbonate resins, and polyether resins.

  The binder resin is not particularly limited, but usually an aqueous resin that can be dispersed or dissolved in an aqueous solvent is preferably used. Examples of such water-based resins include polyurethane resins such as acrylic urethane resins, polyester resins, gelatin, styrene acrylate esters, polyvinyl alcohol, polyethylene oxide, polyvinyl pyrrolidone, pullulan, carboxymethyl cellulose, hydroxyethyl cellulose, dextran, dextrin, Polyacrylic acid and salts thereof, agar, κ-carrageenan, λ-carrageenan, ι-carrageenan, casein, xanthene gum, locust bean gum, alginic acid, gum arabic, polyalkylenoxide copolymer, water-soluble polyvinyl butyral, Examples thereof include homopolymers and copolymers of vinyl monomers having a carboxyl group or a sulfonic acid group. Moreover, you may use in combination of 2 or more types of the said resin. As the binder resin, for example, when using materials such as gelatin, polyvinyl alcohol, agar, κ-carrageenan, λ-carrageenan, ι-carrageenan, etc., these binder resins can also exhibit a cooling gelling function. Separately, a good porous layer can be formed without using a cooling gelling agent described later.

  The amount of the binder resin contained in the second layer 22B as the heat insulating layer having hollow particles can be appropriately determined depending on the type of the hollow particles used, but generally, the total solid content of the second layer 22B. The mass of the binder resin is preferably 5% by mass to 70% by mass, more preferably 10% by mass to 60% by mass, and particularly preferably 15% by mass to 40% by mass.

-3rd layer It does not specifically limit about 3rd layer 22C which comprises the front side base material layer 22, The function and performance calculated | required by the front side base material layer 22, Furthermore, the function calculated | required by the seal-type thermal transfer image receiving sheet 100 It is possible to design appropriately considering the performance and performance.

  For example, when transparency is required for the front-side base material layer 22, the third layer 22C may be a transparent layer. Examples of the third layer as the transparent layer include a transparent polyethylene terephthalate layer and a transparent polypropylene layer. When the third layer is a transparent layer, the total light transmittance (JIS K7105) is preferably 90% or more. In addition, the surface base material layer 22 is required to have rigidity as a seal, so-called stiffness, improvement of adhesive residue when peeled off, and further reduction in thickness of the entire seal-type thermal transfer image receiving sheet in consideration of transportability in the printer. In that case, a material that satisfies each requirement may be selected as appropriate.

  Here, as shown in FIG. 2, when the tensile strength at break is measured in the case where the front side base material layer 22 has a laminated structure formed by laminating two or more layers, the front side base material layer 22 is After the adhesive layer 24 is dissolved by soaking in an organic solvent, the layer located in contact with the pressure-sensitive adhesive layer 21, that is, the first layer 22A in FIG. Just measure.

-Adhesive layer The first layer 22A, the second layer 22B, and the third layer 22C constituting the front-side base material layer 22 may be adhered to each other by the adhesive layer 24. The adhesive layer contains an adhesive. Has an adhesive function. Examples of the adhesive component include urethane resins, polyolefin resins such as α-olefin-maleic anhydride resins, polyester resins, acrylic resins, epoxy resins, urea resins, melamine resins, phenol resins, Examples thereof include vinyl acetate resins and cyanoacrylate resins. Among them, a reactive type of acrylic resin, a modified type, etc. can be preferably used. Further, it is preferable to cure the adhesive using a curing agent because the adhesive force is improved and the heat resistance is also increased. As the curing agent, an isocyanate compound is generally used, but aliphatic amines, cycloaliphatic amines, aromatic amines, acid anhydrides and the like can be used.

  The thickness of the adhesive layer 24 is usually about 0.5 μm or more and 10 μm or less in a dry state. For the formation of the adhesive layer, generally used coating means can be used, for example, by means of gravure printing, screen printing, reverse roll coating using a gravure plate, etc., It can be obtained by drying. Further, EC sand lamination using polyethylene or the like may be performed.

(Other embodiments)
In the seal-type thermal transfer image receiving sheet 100 according to the second embodiment, the front-side base material layer has a three-layer structure, but is not limited thereto, and has a two-layer structure. It may be a four-layer structure or more. However, in any case, the tensile break strength (JIS C2151) in the TD direction of the layer located in contact with the adhesive material layer 21 needs to be 195 MPa or more.

  Hereinafter, the present invention will be described with reference to examples and comparative examples. “Part” in the text is based on mass unless otherwise specified.

In forming the seal-type thermal transfer image-receiving sheet of each example and comparative example, the following thin layers were prepared.
<Thin layer 1>
Transparent polyethylene terephthalate layer (Lumirror (registered trademark) thickness 25μm Toray Industries, Inc.)
Tensile strength at break: 195-295 MPa
Total light transmittance: 90-95%
<Thin layer 2>
Polyethylene terephthalate layer with microvoids (Lumirror (registered trademark) thickness 35μm Toray Industries, Inc.)
Tensile strength at break: 95-175 MPa
Total light transmittance: 15-25%
<Thin layer 3>
Polyethylene terephthalate layer with microvoids (FK202 thickness 75μm Toyobo Co., Ltd.)
Tensile strength at break: 100-185 MPa
Total light transmittance: 0 to 10%
<Thin layer 4>
Transparent polypropylene layer (FOS-BT thickness 30μm Futamura Chemical Co., Ltd.)
Tensile strength at break: 200-370 MPa
Total light transmittance: 90-95%
<Thin layer 5>
Polyester synthetic paper (K1212 Thickness 100μm Toyobo Co., Ltd.)
Total light transmittance: 0 to 10%

  Moreover, the following coating liquids were prepared in forming the seal-type thermal transfer image-receiving sheet of each example and comparative example.

<Coating liquid for receiving layer>
・ 12 parts of vinyl chloride-vinyl acetate copolymer (Solvine (registered trademark) C Nissin Chemical Industry Co., Ltd.)
・ 0.8 parts of epoxy-modified silicone (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
Amino-modified silicone 0.24 parts (X-22-1660B-3 Shin-Etsu Chemical Co., Ltd.)
・ Toluene 30 parts ・ Methyl ethyl ketone 30 parts

<Primer layer coating solution>
・ 10 parts of conductive synthetic layered silicate (Laponite JS Wilber Ellis Co., Ltd.)
・ Polyester resin 10 parts (Polyester (registered trademark) WR905 Nippon Synthetic Chemical Co., Ltd.)
・ Water 80 parts

<Release layer coating solution>
・ 100 parts of addition polymerization silicone (KS847H Shin-Etsu Chemical Co., Ltd.)
・ 200 parts of toluene

<Coating fluid for adhesive layer>
・ Acrylic copolymer 48 parts (SK Dyne 1310L Soken Chemical Co., Ltd.)
・ Epoxy resin 0.36 parts (Hardening agent E-AX Soken Chemical Co., Ltd.)
・ Ethyl acetate 51.64 parts

<Coating liquid for adhesive layer>
・ Urethane resin 30 parts (Takelac (registered trademark) A-969V Mitsui Takeda Chemical Co., Ltd.)
・ Isocyanate 10 parts (Takenate (registered trademark) A-5 Mitsui Takeda Chemical Co., Ltd.)
・ 60 parts of ethyl acetate

Example 1
The above <thin layer 4> is used as the first layer constituting the front-side base material layer, and the above <thin layer 2> is used as the second layer, and these are dry-laminated using an adhesive layer coating solution having the above composition. Was laminated. Subsequently, the above <thin layer 1> was used as the third layer, and this was laminated on the second layer by the dry lamination method using the coating solution for the adhesive layer having the above composition.

  Subsequently, the primer layer coating liquid having the above composition was applied on the third layer constituting the front-side base material layer so as to have a thickness of 1.0 μm when dried, thereby forming a primer layer. Subsequently, on this primer layer, the receiving layer coating solution having the above composition was applied to a thickness of 4.0 μm when dried to form a receiving layer, and the first layer / adhesive layer / second layer was formed. A layered product A in which layer / adhesive layer / third layer / primer layer / receiving layer was laminated in this order was obtained.

  Further, the above <thin layer 5> is used as the back side base material layer, and the release layer coating liquid having the above composition is applied on one surface so as to have a thickness of 0.3 μm when dried. Formed. Subsequently, the pressure-sensitive adhesive layer coating solution having the above composition is applied on the release layer so as to have a thickness of 10.0 μm when dried to form an adhesive layer, and the back side substrate layer / release layer is formed. A laminate B in which the mold layer / adhesive layer was laminated in this order was obtained.

  Subsequently, the back side base material layer / release layer / adhesive material layer / first layer / adhesive layer / second is obtained by laminating the first layer of the laminate A and the adhesive material layer of the laminate B. A seal-type thermal transfer image-receiving sheet of Example 1 in which a layer / adhesive layer / third layer / primer layer / receiving layer were laminated in this order was produced.

(Example 2)
A sealed thermal transfer image-receiving sheet of Example 2 was produced in the same manner as in Example 1 except that the above <thin layer 3> was used as the second layer of the front side base material layer.

(Example 3)
A sealed thermal transfer image-receiving sheet of Example 3 was produced in the same manner as in Example 1 except that the above <thin layer 1> was used as the first layer of the front side base material layer.

Example 4
The third layer of the front side base material layer is not provided, and the above <thin layer 4> is used as the first layer and the above <thin layer 2> is used as the second layer, and these are used as the adhesive layer coating liquid having the above composition. The laminate A was obtained by using the dry lamination method. Otherwise, in the same manner as in Example 1, the back side substrate layer / release layer / adhesive layer / first layer / A seal-type thermal transfer image-receiving sheet of Example 4 in which the adhesive layer / second layer / primer layer / receiving layer was laminated in this order was produced.

(Comparative Example 1)
The third layer of the front side base material layer is not provided, and the above <thin layer 2> is used as the first layer and the above <thin layer 1> is used as the second layer, and these are used as the adhesive layer coating solution having the above composition. The laminate A was obtained by using the dry lamination method. Otherwise, in the same manner as in Example 1, the back side substrate layer / release layer / adhesive layer / first layer / A seal-type thermal transfer image-receiving sheet of Comparative Example 1 was produced in which the adhesive layer / second layer / primer layer / receiving layer were laminated in this order.

(Comparative Example 2)
The third layer of the front-side base material layer is not provided, and the above <thin layer 3> is used as the first layer and the above <thin layer 1> is used as the second layer, and these are used as the adhesive layer coating liquid having the above composition. The laminate A was obtained by using the dry lamination method. Otherwise, in the same manner as in Example 1, the back side substrate layer / release layer / adhesive layer / first layer / A sealed thermal transfer image-receiving sheet of Comparative Example 2 was produced in which the adhesive layer / second layer / primer layer / receiving layer were laminated in this order.

(Comparative Example 3)
A sealed thermal transfer image receiving sheet of Comparative Example 3 was prepared in the same manner as in Example 1 except that the above <thin layer 2> was used as the first layer of the front side base material layer and the above <thin layer 4> was used as the second layer. Produced.

(Evaluation of seal-type thermal transfer image-receiving sheet)
For each of the seal-type thermal transfer image receiving sheets of Examples 1 to 4 and Comparative Examples 1 to 3, (1) Cutter glue adhesion evaluation, (2) Printer discharge performance evaluation, and (3) Evaluation of image expression of printed matter. Went.

(1) Evaluation of adhesion of cutter paste Adhesion of adhesive material to a cutter after cutting 10,000 sheets using each of the seal type thermal transfer image receiving sheets prepared above and a printer (Mitsubishi Electric Corp., CP9650) The level was checked visually.
(Evaluation criteria)
○: Adhesive material adhesion to the cutter was hardly observed.
X: Many adhesive materials adhered to the cutter.

(2) Evaluation of printer discharge performance Using the printer of (1) above, 10 sheets of 128 gray were continuously printed in an environment of 0 ° C., and the discharged product from the printer was visually confirmed.
(Evaluation criteria)
○: Printed material was smoothly discharged from the printer.
X: The printed matter stuck to the printer discharge port, and a discharge failure occurred.

(3) Image Representation of Printed Material Using the printer of (1) above, a portrait image was printed, and the printed material was visually evaluated based on the following evaluation criteria.
(Evaluation criteria)
○: The image of the printed material was excellent in transparency, deep, and excellent in stereoscopic effect.
X: The image of the printed material was poor in transparency and depth, and did not have a three-dimensional effect.

  The results of the above evaluations are shown in Table 1. The seal-type thermal transfer image-receiving sheet of the example satisfying the layer structure of the present invention is found to be superior in the discharge performance from the printer because the adhesion of the adhesive material to the cutter is suppressed as compared with the seal-type thermal transfer image-receiving sheet of the comparative example. It was.

DESCRIPTION OF SYMBOLS 100 ... Seal type | mold thermal transfer image receiving sheet 10 ... Release sheet part 11 ... Back side base material layer 12 ... Release layer 13 ... Back surface layer 20 ... Seal base material part 21 ... Adhesive material layer 22 ... Front side base material layer 22A ... 1st layer 22B ... 2nd layer 22C ... 3rd layer 23 ... Receptive layer 24 ... Adhesive layer 25 ... Primer layer

Claims (2)

A release sheet portion including a back side base material layer;
From the surface of the release sheet part, an adhesive material layer, a front side base material layer, and a receiving layer are laminated in this order, and a seal base material part provided so as to be peelable from the release sheet part,
A seal-type thermal transfer image-receiving sheet comprising:
The front side base material layer has a single layer structure composed of a single layer, or a laminated structure formed by laminating two or more layers, and
(A) When exhibiting a single layer structure, the tensile breaking strength (JIS C2151) in the TD direction of the single layer is 195 MPa or more,
(B) When exhibiting a laminated structure, the tensile breaking strength (JIS C2151) in the TD direction of the layer located in contact with the pressure-sensitive adhesive layer among the two or more layers is 195 MPa or more.
A seal-type thermal transfer image-receiving sheet. The front substrate layer has a laminated structure in which two or more layers are laminated, and the total light transmittance (JIS K7105) of a layer located on the receiving layer side of the two or more layers is 90%. That's it,
The sealed thermal transfer image-receiving sheet according to claim 1, wherein:

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