JP2006123526A - Protection layer thermal transfer film and printed matter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective layer thermal transfer film capable of forming a protective layer, which is excellent in aqueous ink fixing properties, and solvent resistance and especially excellent in water resistance, and excellent in peelability. <P>SOLUTION: The thermally transferable protective layer is provided at least on a part of one side of a base material film and is constituted by laminating at least a peeling layer, which becomes the outermost surface layer after transfer, on the base material film while the peeling layer contains polyvinyl pyrrolidone. The printed matter is obtained by thermally transferring the protective layer on the image of printed matter. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a protective layer thermal transfer film and a printed matter in which the protective layer of the film is transferred onto an image.

  Conventionally, an image such as a gradation image, a monotonous image such as a character, a symbol, or the like is formed on a base material using a thermal transfer method. As the thermal transfer system, a thermal sublimation transfer system and a thermal melt transfer system are widely used.

  Among these, the thermal sublimation transfer method uses a thermal transfer film in which a dye layer in which a sublimable dye used as a coloring material is dissolved or dispersed in a binder resin is supported on a base material, and this thermal transfer film is superimposed on an image receiving film to form a thermal head. By applying energy according to image information to a heating device such as a sublimation dye contained in the dye layer on the thermal transfer film, the image is formed by transferring the dye to the image receiving film.

  This heat-sensitive sublimation transfer method can control the amount of dye transfer in dot units according to the amount of energy applied to the thermal transfer film, and is therefore excellent in the formation of gradation images and has the advantage of easy formation of characters, symbols, etc. Have.

  Images formed by the above heat-sensitive sublimation transfer method protect the images because the transferred dye is present on the surface of the transfer target, and also from the viewpoint of image protection such as light resistance and abrasion resistance. Many techniques for forming a protective layer are known (for example, Patent Document 1 and Patent Document 2).

  However, some sublimation transfer prints have applications that require printing suitability with water-based stamps (for example, ID photo applications such as passports). That is, fixability of water-based ink is required.

From the viewpoint of water-based ink fixing properties, for example, in the field of ink-jet receiving layers, an ink-jet receiving layer in which a water-absorbing resin such as polyvinyl alcohol (PVA) contains a large amount of particles such as silica is known. . However, such an ink jet receiving layer is coated with a considerable coating amount (usually 10 g / m ² or more) in order to maintain aqueous ink fixability. Accordingly, even if such a receiving layer is used as a protective layer for a printed material formed by a thermal transfer method, there are problems such as poor foil breakage and lack of transparency of the film itself. Since the protective layer of the printed image formed by the thermal transfer method requires an aqueous stamp fixing property in addition to a thin film and transparency, the ink jet receiving layer technique cannot be applied to the protective layer of the protective layer thermal transfer film.

  Furthermore, the printed material protective layer formed by a thermal transfer method such as sublimation transfer is also required to have characteristics contrary to the water-based ink fixing property, that is, water resistance (no problem even if wiped after applying water). .

In addition, since the protective layer thermal transfer film is composed of a water-absorbing resin layer as a peeling interface, the film or sheet changes in adhesion at the peeling interface before and after storage in a high-temperature and high-humidity environment, causing a problem of peeling failure .
JP 2000-80844 A JP 2000-71626 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a protective layer thermal transfer film that can form a protective layer excellent in water-based ink fixing property, solvent resistance, particularly water resistance, and excellent in releasability. And

  That is, the present invention has a protective layer capable of thermal transfer on at least a part of one side of the substrate film, and the protective layer is formed by laminating at least a release layer that becomes an outermost layer after transfer, The present invention relates to a protective layer thermal transfer film and a printed matter having the protective layer, wherein the release layer contains at least polyvinyl alcohol, polyvinyl pyrrolidone and an inorganic filler.

  FIG. 1 shows a schematic cross-sectional view of an example of the protective layer thermal transfer film of the present invention. In the protective layer thermal transfer film 1, a release layer 3, a release layer 4, a porous layer 5, a primer layer 6, and a heat seal layer (HS layer) 7 are sequentially formed on one surface of a base film 2. Among these, the laminated body except the base film 2 and the release layer 3 is called a protective layer 8.

  The base film 1 can be the same base film widely used in this field, and is not particularly limited. Specific examples of the base film include polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyphenylene sulfide, polyether ketone, polyether sulfone and other high heat-resistant polyesters; polypropylene, polycarbonate, cellulose acetate, polyethylene derivatives, Examples thereof include plastic films such as polyvinyl chloride, polyvinylidene chloride, polystyrene, polyamide, polyimide, polymethylpentene, and ionomer, and laminates thereof. The plastic film may be stretched or unstretched. Although the thickness of a base film can be suitably selected in consideration of strength, heat resistance, etc., it is usually appropriately selected from the range of about 1 to 100 μm.

  The release layer 3 is provided as necessary in order to adjust the adhesiveness between the base film and the protective layer and to satisfactorily peel the protective layer when the peelability between the base film and the protective layer is not appropriate. It is done.

  The release layer 3 is, for example, various waxes such as silicone wax or silicone oil, silicone resin, fluorine resin, acrylic resin (used to include both acrylic resin and methacrylic resin), water-soluble It is formed from various resins such as resins, cellulose derivative resins, urethane resins, acetic acid vinyl resins, acrylic vinyl ether resins, and maleic anhydride resins, and mixtures thereof. A preferred resin in the present invention is an acrylic resin, particularly a thermosetting silicone-modified acrylic resin, and is preferably used in combination with silicone oil. When using curable resin, about 1 to 10 weight% of hardening | curing agents, such as an aluminum chelate compound, are added with respect to curable resin.

  The release layer 3 is a coating solution obtained by dissolving or decomposing the resin, wax, or other desired additive in a solvent such as an organic solvent, on a base film by a known coating method such as a wire coating method. And if necessary, it can be formed by curing and drying. The thickness of the release layer is usually about 0.1 to 5 μm, preferably about 0.5 to 5.0 μm, more preferably about 0.5 to 2 μm.

  When the release layer 3 is provided, the protective layer is peeled off from the release layer 4 by transfer, and the release layer 3 itself is formed to remain on the base film 2 side.

  The release layer 4 is composed of at least polyvinyl alcohol, polyvinyl pyrrolidone, and an inorganic filler.

  Polyvinyl alcohol having a number average molecular weight (Mn) of 50,000 to 120,000, preferably 60000 to 100,000, and a saponification degree of 80% or more is used. The higher the degree of saponification, the better. The molecular weight of polyvinyl alcohol indicates a value obtained by a general method calculated from measurement of specific viscosity using a capillary viscometer. Polyvinyl alcohol is a component responsible for water resistance (solvent resistance). The degree of saponification means the ratio between the theoretical value of the saponification value that has been completely saponified and the actual saponification value, and the alkali required for saponification is obtained by titration and can be obtained by a general method of calculation from here. it can.

  Polyvinylpyrrolidone having a number average molecular weight (Mn) of 350,000 to 3500000, preferably 100000 to 2000000, and a K value of 60 to 120 is used. Polyvinyl pyrrolidone is a component that bears sealability.

In the present invention, the molecular weight of polyvinylpyrrolidone is represented by a value measured by the GPC method. The K value is a viscosity derived from a relational expression of (log η / c) = (75 K ² /(1+1.5 Kc)) + K where the specific viscosity is η and the solution concentration is c (g / dL). Means a highly correlated measure of molecular weight. The specific viscosity η is a value measured by a general method using a capillary viscometer.

  Polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP) are used within a range of PVA / PVP (weight ratio) of 5/1 to 1/5, preferably 1/2 to 2/1. . If there is too much polyvinyl alcohol, the sealability will be lowered, and if there is too much polyvinylpyrrolidone, water resistance (solvent resistance) will be lowered.

  The total amount of polyvinyl alcohol and polyvinyl pyrrolidone used is 20 to 80% by weight, preferably 40 to 60% by weight, based on the total weight of the release layer.

  As the inorganic filler, for example, silica, titania, alumina, nylon filler, organic filler) or the like, preferably silica is used. The inorganic filler to be used is alkaline and has an average particle size of 100 nm or less. The smaller the particle size, the better. When the particle size of the inorganic filler is too large, there arises a problem that the transparency of the film is impaired by a large amount of addition. If the inorganic filler is not alkaline, there is a problem that the solution gels when mixed with polyvinylpyrrolidone at the time of film production.

  The usage-amount of an inorganic filler is 20 to 80 weight% with respect to the total weight of a peeling layer, Preferably it is 40 to 60 weight%. If the amount used is too small, the sealability and water resistance (solvent resistance) are lowered. When the amount used is too large, the transparency of the film is lowered.

  In addition to the release layer, other additives such as leveling agents, antifoaming agents, fluorescent whitening agents, ultraviolet absorbers and the like are added in an amount of about 0.01 to 5% by weight based on the total weight of the release layer. May be.

  The release layer is formed by dissolving or decomposing polyvinyl alcohol, polyvinyl pyrrolidone, inorganic filler, and other additives in a solvent such as water or an organic solvent on the base film or the release layer formed on the base film. It is formed by applying and drying the coating liquid by a known coating method such as a wire coating method. The thickness of the release layer is usually about 0.01 to 2 μm, preferably about 0.1 to 0.5 μm.

  The porous layer 5 is formed from at least polyvinyl alcohol, an inorganic filler, and a curing agent. As the polyvinyl alcohol and inorganic filler, those used in the release layer can be used in the same manner.

  Polyvinyl alcohol bears water resistance and solvent resistance. The usage-amount of polyvinyl alcohol is 5 to 50 weight% with respect to the total weight of a porous layer, Preferably it is 10 to 40 weight%. When the amount is too small, there is a problem that the solvent resistance of the coating film is deteriorated. When the amount is too large, there is a problem of tailing at the time of printing.

  The amount of the inorganic filler used is 50 to 95% by weight, preferably 60 to 95% by weight, based on the total weight of the porous layer. When the amount is too large, there is a problem that the solvent resistance of the coating film is deteriorated, and when the amount is too small, there is a problem that the foil cutting property is lowered.

  The curing agent added to the porous layer is for imparting water resistance and solvent resistance to polyvinyl alcohol, and an isocyanate compound, a melamine compound, a chelating agent, preferably a melamine compound can be used. The usage-amount of a hardening | curing agent is 0.001-1 weight% with respect to polyvinyl alcohol, Preferably it is about 0.05-5 weight%. When there is too much usage-amount of a hardening | curing agent, foil cutting property will fall. When there is too little usage-amount of a hardening | curing agent, water resistance and solvent resistance will fall.

  In addition to the porous layer, other additives such as leveling agents, antifoaming agents, coatability improving agents, fluorescent whitening agents, ultraviolet absorbers, etc. are added in an amount of about 0.01 to 5% by weight based on the total weight of the porous layer. May be.

  The porous layer is a coating solution obtained by dissolving or decomposing polyvinyl alcohol, inorganic filler, curing agent, and other additives in a solvent such as water or an organic solvent on the release layer by a known coating method such as a wire coating method. It is formed by coating, curing and drying. The thickness of the porous layer is usually about 0.1 to 2 μm, preferably about 0.3 to 1 μm.

  The primer layer 6 is mainly formed of a polymaleic anhydride resin and an acrylic resin, preferably a polymethyl methacrylate resin. Since the primer layer 6 has a function of ensuring adhesion between the porous layer 6 and the heat seal layer formed thereon, the primer layer 6 is highly compatible with the heat seal layer (solvent resin) described below. It is necessary to be soluble in alcohol solvents and ketone solvents and to have a certain level of water resistance. The primer layer is configured from such a viewpoint.

  A polymaleic anhydride resin having a number average molecular weight (Mn) of 50,000 to 500,000, preferably 100,000 to 300,000 is used. In the present invention, the molecular weight of polymaleic anhydride is represented by a value measured by the GPC method.

  The acrylic resin has a weight average molecular weight (Mw) of 10,000 to 100,000, preferably 20,000 to 50,000. In the present invention, the molecular weight of the acrylic resin is represented by a value measured by the GPC method.

  The polymaleic anhydride and the acrylic resin are used in a weight ratio of 5/1 to 1/5, preferably 1/2 to 2/1. If the amount of polymaleic anhydride resin is too large, there is a problem of deterioration of water resistance and adhesiveness with the heat seal layer. If too much acrylic resin is used, deterioration of solvent resistance and adhesion with porous layer are caused. There is a problem of deterioration.

  The total amount used of the polymaleic anhydride resin and the acrylic resin is 50% by weight or more, preferably 90% by weight or more of the total weight of the primer layer.

  It is preferable to add urethane polyol to the primer layer. This urethane polyol plays a role of improving the adhesion to the heat seal layer.

  When the urethane polyol is added, it is 1 to 15% by weight, preferably 5 to 10% by weight, based on the total amount of the primer layer. If the amount is too large, there is a problem of lowering the transparency of the coating film. If the amount is too small, there is a problem that the effect of improving the adhesion cannot be expressed.

  In addition to the primer layer, additives such as leveling agents, antifoaming agents, fluorescent whitening agents, UV absorbers, etc. are added in an amount of about 0.01 to 5% by weight based on the total weight of the primer layer. May be.

  The primer layer is a coating solution prepared by dissolving or dispersing a polymaleic anhydride resin, an acrylic resin, and, if necessary, a urethane polyol and other additives in a solvent such as an organic solvent on the porous layer. It is formed by applying, curing and drying by a known coating method. The thickness of the primer layer is usually about 0.1 to 2 μm, preferably about 0.2 to 1 μm.

  The heat seal layer plays a role of adhesion of the protective layer to the image surface. As the resin constituting the heat seal layer, any resin containing a conventionally known pressure-sensitive adhesive, heat-sensitive adhesive and the like can be used, but the glass transition temperature (Tg) is 50 to 100 ° C., preferably It is preferable that it is a 70-100 degreeC thermoplastic resin. Specific examples of such thermoplastic resins include polyester resins, vinyl chloride-vinyl acetate copolymer resins, acrylic resins, butyral resins, epoxy resins, polyamide resins, vinyl chloride resins, and the like. The heat seal layer may contain additives such as an ultraviolet absorber, an antioxidant, and a fluorescent brightening agent.

  The heat seal layer is formed by applying a coating solution obtained by dissolving or dispersing the above resin and other additives in a solvent such as an organic solvent on the primer layer by a known coating method such as a wire coating method, curing, and drying. Is formed. The thickness of the heat seal layer is usually about 0.1 to 10 μm, preferably about 0.5 to 5 μm.

  In the present invention, a back layer may be formed on the other surface of the base film. The back layer is provided for the purpose of preventing thermal fusion between a heating device such as a thermal head and the base film 2 and smooth running. Examples of the resin used for the back layer include cellulose resins such as ethyl cellulose, hydroxy cellulose, hydroxypropyl cellulose, methyl cellulose, cellulose acetate, cellulose butyrate, and nitrocellulose; polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyvinyl Vinyl resins such as pyrrolidone; Acrylic resins such as polymethyl methacrylate, polyethyl acrylate, polyacrylamide, acrylonitrile-styrene copolymer; Polyamide resin; Polyvinyl toluene resin; Coumarone indene resin; Polyester resin; Polyurethane resin A simple substance or a mixture of natural or synthetic resins such as silicone-modified or fluorine-modified urethane is used. Of the above resins, a resin having a hydroxyl group reactive group (for example, butyral resin, acetal resin, etc.) is used in order to further increase the heat resistance of the back layer, and polyisocyanate is used in combination as a crosslinking agent. Thus, a crosslinked resin layer is preferable.

  Further, in order to impart slidability with the thermal head, a solid or liquid release agent or lubricant may be added to the back layer to provide heat-resistant lubricity. Examples of release agents or lubricants include various waxes such as polyethylene wax and paraffin wax; higher aliphatic alcohols, organopolysiloxanes, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants Various surfactants such as an activator and a fluorine-based surfactant; fine particles of inorganic compounds such as organic carboxylic acids and derivatives thereof, fluorine-based resins, silicone-based resins, talc, and silica can be used. The amount of lubricant contained in the back layer is about 5 to 50% by weight, preferably about 10 to 30% by weight in the back surface.

  The back layer is formed by applying a coating solution obtained by dissolving or dispersing the above resin and other additives in a solvent such as water or an organic solvent on a base film by a known coating method such as a wire coating method, and drying. It is formed by. The thickness of the back layer is usually about 0.1 to 10 μm, preferably about 0.5 to 5 μm.

The protective layer thermal transfer film of the present invention is not limited to the above-described embodiment, and is a composite type protective layer thermal transfer film of a thermal transferable protective layer and a heat sublimable color material layer, a thermal transferable protective layer, and a thermal melt. It can be arbitrarily set according to the purpose of use, such as a protective layer thermal transfer film of a composite type with a colorant material layer. In the case of the former composite type protective layer thermal transfer film, if a transfer material has a dye receiving layer, image formation by the thermal transfer method and transfer of the protective layer to the transfer material can be performed simultaneously. .
As another example of the protective layer heat transfer film, at least one color material layer selected from the group consisting of a heat transferable protective layer, a heat sublimation color material layer, and a heat meltable color material layer is provided on one surface of the base film. And a protective layer thermal transfer film in which are sequentially provided.

  FIG. 2 is a schematic cross-sectional view showing another example of the protective layer thermal transfer film of the present invention. In FIG. 2, the protective layer thermal transfer film 21 of the present invention has a heat sublimation color material layer Y, a heat sublimation color material layer M, a heat sublimation color material layer C, a heat sublimation property on one surface of a base film 22. The color material layer B and the heat transferable protective layer 26 are formed in the surface order, and the back layer 27 is formed on the other surface of the base film 22. The heat-sublimable color material layers Y, M, C, and B in FIG. 2 may be heat-meltable color material layers Y, M, C, and B, and these layers are mixed and configured. Also good.

  The transfer target may be a film made of any base material such as plain paper, high-quality paper, tracing paper, or plastic film. Further, the transfer object may have any shape such as a card, a postcard, a passport, a notepaper, a report sheet, a notebook, a catalog, and the like.

  Specific examples of the transfer object of the present invention include, for example, stock certificates, securities, certificates, passbooks, boarding tickets, car horse tickets, stamps, stamps, appreciation tickets, entrance tickets, tickets, etc .; cash cards, credit cards , Prepaid cards, members cards, greeting cards, postcards, business cards, driver's licenses, IC cards, optical cards, etc .; cartons, cases such as containers; bags: forms, envelopes, tags, OHP sheets, slide films , Bookmarks, calendars, posters, brochures, menus, passports, POP supplies, coasters, tisplays, nameplates, keyboards, cosmetics, watches, lighters, and other accessories; stationery, report paper, and other stationery; building materials, panels, emblems, Keys, cloth, clothing, footwear, radio, TV, calculator, OA equipment, etc., each Sample book, mention may be made of the album, the output of computer graphics, the medical image output, and the like.

  The image on the transfer medium may be formed by any method such as an electrophotographic method, an ink jet recording method, or a thermal transfer recording method.

  Since the transfer material to which the protective layer thermal transfer film of the present invention is transferred and the fixing property of the water-based ink are good, the water-based type printing property and the writing property of the water-based ink are excellent.

  In using the protective layer thermal transfer film of the present invention, conventionally known methods for using the protective layer thermal transfer film can be employed as they are. For example, the heat seal layer layer surface of the protective layer thermal transfer film of the present invention may be superimposed on the transfer target, and the protective layer may be thermally transferred onto the transfer target.

Examples will be described below. The products used in this example are briefly summarized below. Unless otherwise specified, “%” is “% by weight”.

Cell Top 226: Silicone-modified acrylic resin, manufactured by Daicel Chemical Industries,
Solid content 50%
Cell Top CAT-A: Hardener, manufactured by Daicel Chemical Industries, solid content 10%
KF-355A: Silicone oil, manufactured by Shin-Etsu Chemical Co., Ltd.
Viscosity 150mm ² / s (25 ° C)

RS-1717: Polyvinyl alcohol, manufactured by Kuraray Co., Ltd.
Saponification degree 95%, Mn: 80000
PVP-K90: Polyvinylpyrrolidone, manufactured by ISP Japan Co., Ltd.
Mn: 1570000 (K value = 90)
Snowtex 20L: Colloidal silica, manufactured by Nissan Chemical Co., Ltd.
Average particle size 40nm
C318: Polyvinyl alcohol, manufactured by Kuraray Co., Ltd.
Saponification degree 80%, Mn: 80000
Snowtex OL-40: Colloidal silica, manufactured by Nissan Chemical Co., Ltd.
Average particle size 40nm
Byronal MD-1500: Polyester, manufactured by Toyobo Co., Ltd.
Sumirez resin 5004: Hardener, manufactured by Sumitomo Chemical Co., Ltd.

GANTREZ AN-119: Polymaleic anhydride, manufactured by ISP Japan,
Mn: 130000
Dianal BR-87: Polymethylmethacrylic acid (PMMA), manufactured by Mitsubishi Rayon Co., Ltd.
Mw: 25000
Samprene IB-114B: Urethane polyol, manufactured by Sanyo Chemical Co., Ltd.
Diamond LR-209: Acrylic polyol, manufactured by Mitsubishi Rayon Co., Ltd.

Byron 700: Polyester, manufactured by Toyobo Co., Ltd.
Mn: 9000
PUVA-50M-40TM: (UVA) -containing acrylic resin, manufactured by Otsuka Chemical Co., Ltd.
Mn: 30000
Tinuvin 900: UVA compound, Silysia 310P manufactured by Ciba Specialty Chemicals Co., Ltd .: Silica filler, Fuji Silysia Co., Ltd.
Average particle size 3 μm,
UVA stands for “ULTRA-VIOLET LIGHT ABSORBER”.

Preparation of protective layer thermal transfer film (ribbon) (Examples 1-3, Comparative Examples 1-9)
First layer (release layer)
The formulations shown in Tables 1 and 2 (% in the table represents% by weight) were diluted with a solvent (toluene / methyl ethyl ketone (MEK) = 1/1) so that the solid content was 20%, A release layer ink was prepared. The obtained ink was applied onto a PET film having a thickness of 4.5 μm with a wire coater bar (# 3) so that the application amount was 1.0 g / m ² (when dry, the same applies hereinafter). The obtained coated film was dried in an oven at 110 ° C. for 1 minute.

Second layer (peeling layer)
The formulations shown in Tables 1 and 2 were diluted with a solvent (water / isopropyl alcohol (IPA) = 1/1) so that the solid content would be 5% to prepare a release layer ink. The obtained ink was apply | coated to PET film which apply | coated the 1st layer so that it might become a coating amount 0.2g / m < ² > with a wire coater bar (# 3). The obtained coated film was dried in an oven at 110 ° C. for 1 minute.

Third layer (porous layer)
The formulations shown in Tables 1 and 2 were diluted with a solvent (water / IPA = 1/1) so that the solid content would be 15% to prepare a porous layer ink. The obtained ink was apply | coated to PET film which apply | coated the 2nd layer so that it might become the application quantity 0.8g / m < ² > with a wire coater bar (# 3). The obtained coated film was dried in an oven at 110 ° C. for 1 minute.

Fourth layer (primer layer)
The formulations shown in Tables 1 and 2 were diluted with a solvent (MEK / IPA = 5/1) so that the solid content would be 10% to prepare primer layer inks. The obtained ink was apply | coated to PET film which apply | coated the 3rd layer so that it might become the application quantity of 0.4 g / m < ² > with a wire coater bar (# 3). The obtained coated film was dried in an oven at 110 ° C. for 1 minute.

5th layer (heat seal layer (HS) layer)
The formulations shown in Tables 1 and 2 were diluted with a solvent (toluene / MEK = 1/1) so that the solid content would be 20%, to prepare a heat seal layer ink. The obtained ink was apply | coated to PET film which apply | coated the 4th layer so that it might become the application quantity 1.3g / m < ² > with a wire coater bar (# 4). The obtained coated film was dried in an oven at 110 ° C. for 1 minute.

(Manufacture of prints)
An image was formed by a printer (SONY photo printer DPP-SV55) using a thermal transfer film provided with yellow, magenta and cyan color material layers.

  Next, the protective layer thermal transfer films produced in the above examples and comparative examples are superimposed on the image forming unit, and the protective layer is transferred from the protective layer thermal transfer film to an image using a printer (SONY photo printer DPP-SV55). The image was transferred so as to cover the forming portion, and a printed material covered with a protective layer was formed.

(Evaluation)
(Sealability)
The surface of the printed matter obtained above was printed with an aqueous stamp. After 1 minute, the paper was wiped 10 times with a paper wiper under a load of 100 g, and the fixing property of the stamp was visually evaluated and ranked as follows. The results are summarized in Table 2.
◎: Recognized character (design) clearly recognized ○: Recognized character (design) recognized

(Water resistance, ethanol resistance, acetone resistance)
The surface of the printed material was rubbed 10 times with a cotton swab containing water, ethanol or acetone under a load of 100 g, and the damage received by the image was visually evaluated and ranked as follows. The results are summarized in Table 2.
◎: Deterioration cannot be confirmed ○: Traces are visible, but there is almost no degradation △: Image damage is yes x: Image is damaged

  Foil cut: A special dye receiving paper was printed with a sublimation printer (UP-DX100), and it was confirmed whether or not the unprinted portion at the end of the protective layer printing was stuck to the image receiving paper (presence of tailing). When there was no tailing, “○” was ranked, and when there was tailing, “×” was ranked. The results are summarized in Table 2.

(The invention's effect)
The protective layer thermal transfer film of the present invention can form a protective layer excellent in water-based ink fixability, solvent resistance, particularly water resistance, and is excellent in peelability.
The transfer material to which the protective layer of the protective layer thermal transfer film of the present invention has been transferred is excellent in water-type printing properties and writing properties such as water-based ink.

The typical sectional view of one embodiment of the protective layer thermal transfer film of the present invention. The typical sectional view of one embodiment of the protection layer thermal transfer sheet of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Protective layer thermal transfer film 2 Base film 3 Release layer 4 Release layer 5 Porous layer 6 Primer layer 7 Heat seal layer (HS layer)
8 Protective layer 21 Protective layer thermal transfer film 22 Substrate film 26 Thermal transfer protective layer 27 Back layer

Claims (9)

  A protective layer capable of thermal transfer is provided on at least a part of one side of the base film, and the protective layer is formed by laminating at least a release layer to be an outermost surface layer after transfer, and the release layer is at least A protective layer thermal transfer film comprising polyvinyl alcohol, polyvinyl pyrrolidone and an inorganic filler.   The protective layer thermal transfer film according to claim 1, further comprising a release layer on the substrate film side of the release layer, wherein the release layer is formed of at least a silicone-modified acrylic resin, silicone oil, and a curing agent. .   The protective layer thermal transfer film according to claim 1, further comprising a porous layer on the release layer, wherein the porous layer is formed from polyvinyl alcohol, an inorganic filler, and a curing agent.   The protective layer thermal transfer film according to claim 1, further comprising a primer layer on the porous layer, wherein the primer layer is formed of at least a polymaleic anhydride resin, an acrylic resin, and a urethane polyol.   The protective layer thermal transfer film according to claim 1, further comprising a heat seal layer on the primer layer.   The heat sublimable color material layer and / or the heat meltable color material layer is provided on one surface of the base film together with a heat transferable protective layer, according to any one of claims 1 to 5. Protective layer thermal transfer film.   A printed matter obtained by thermally transferring the protective layer of the protective layer thermal transfer film according to claim 1 onto an image of the printed matter.   The printed matter according to claim 7, wherein the image of the printed matter is obtained by any one of an electrophotographic method, an inkjet recording method, and a thermal transfer recording method. The printed matter according to claim 7, wherein the image of the printed matter is obtained by a thermal transfer recording method.

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