JP2672294B2 - Thermal transfer sheet - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a heat-sensitive transfer sheet, and more particularly to a heat-sensitive transfer sheet having improved transfer efficiency and printing quality and reduced peeling noise. [Background of the Invention] When an output print of a computer or a word processor is printed by a heat-sensitive transfer method, a heat-sensitive transfer sheet provided with a heat-meltable ink layer on one surface of a base film,
Use a thermal head. Conventional thermal transfer sheets
A hot-melt ink layer in which a pigment is mixed with wax using a paper such as a capacitor paper or paraffin paper with a thickness of 10 to 20 μ as a base film, or a plastic film such as polyester or cellophane with a thickness of 3 to 20 μ. Is provided on the base film by coating. The thermal transfer sheet is often used in the form of a film or a rolled-up form. However, the conventional heat-sensitive transfer sheet has a problem in that the releasability between the base film and the ink layer is not yet sufficiently good, so that it is not always satisfactory in terms of printing quality and transfer efficiency. Further, the conventional heat-sensitive transfer sheet also has a problem that the peeling noise during printing is relatively large. SUMMARY OF THE INVENTION The present invention has been made in view of the above points,
It is an object of the present invention to provide a heat-sensitive transfer sheet with improved transfer efficiency and print quality and reduced peeling noise. In order to achieve such an object, the heat-sensitive transfer sheet of the present invention is a heat-sensitive transfer sheet in which a heat-meltable ink layer is formed on one surface of a base film, wherein the base film and the heat-meltable ink layer are It is characterized in that a peeling layer is provided therebetween. In the present invention, in order to further improve the print quality and transfer efficiency, the following modes can be adopted. (I) An aspect of the heat-sensitive transfer sheet of the present invention in which a heat resistant protective layer is provided on the surface of the base film on the side in contact with the thermal head. (Ii) A mode of the heat-sensitive transfer sheet of the present invention in which a mat layer is provided between the heat-meltable ink layer and the peeling layer. (Iii) An aspect of the heat-sensitive transfer sheet of the present invention in which the surface of the base film on the ink layer side is matt processed. (Iv) The heat-meltable ink layer has a melt viscosity of 1 at 100 ° C.
An embodiment of the heat-sensitive transfer sheet of the present invention, which comprises an ink of 0 cps to 60 cps. (V) A mode of the heat-sensitive transfer sheet of the present invention, in which a sealing layer for sealing the printed portion of the transferred paper is formed on the surface of the heat-meltable ink layer during transfer. [Detailed Description of the Invention] The constituent layers and materials of the heat-sensitive transfer sheet of the present invention will be described in detail below. Base Film As the base film used in the present invention, a conventional base film can be used as it is, and other films can also be used, and there is no particular limitation. As the type of the film, for example, polyester, polypropylene, cellophane, polycarbonate, cellulose acetate, polyethylene, polyvinyl chloride, polystyrene, nylon, polyimide, polyvinylidene chloride,
Examples include plastics such as polyvinyl alcohol, fluororesin, hydrochloric acid rubber, and ionomer; papers such as condenser paper and paraffin paper; and nonwoven fabrics, and a composite film of these. The thickness of the base film can be appropriately changed depending on the material so that its strength and thermal conductivity are appropriate, and the thickness is, for example, 1 to 25 μ, and preferably 3 to 25 μ. . Hot-melt ink layer The hot-melt ink layer is composed of a colorant and a vehicle,
Further, various additives may be added as necessary. As this colorant, among organic or inorganic pigments or dyes, those having good properties as a recording material,
For example, those having a sufficient coloring density and not discolored or faded by light, heat, humidity or the like are preferable. In addition, a substance which is colorless when not heated but develops a color when heated, or a substance which develops a color when it comes into contact with a substance applied to a transfer object may be used. Cyan, magenta,
In addition to the colorants that form yellow and black, colorants of other various colors can also be used. That is, in the hot-melt ink, carbon black or various dyes and pigments are selected and added as a colorant according to the color to be given to the ink. As the vehicle, wax, drying oil, resin, mineral oil, derivatives of cellulose and rubber, and the like, and a mixture thereof are used. Here, as typical examples of the wax, microcrystalline wax, carnauba wax, and paraffin wax are preferably used. In addition, Fischer-Tropsch wax, various low molecular weight polyethylenes and some modified waxes, fatty acid esters, amides, wood Various waxes such as wax, beeswax, whale wax, botaro wax, wool wax, shellac wax, candelilla wax, petrolatum and the like can be used. Here, as the resin, for example, EVA (ethylene-vinyl acetate copolymer), EEA (ethylene-ethyl acrylate copolymer), polyethylene, polystyrene, polypropylene, polybutene, petroleum resin, vinyl chloride resin, polyvinyl alcohol, chloride Vinylidene resin, methacrylic resin,
Polyamide, polycarbonate, fluororesin, polyvinyl formal, polyvinyl butyral, acetyl cellulose, nitrocellulose, vinyl acetate resin, polyisobutylene or polyacetal can be used. Here, a heat conductive substance can be blended with the ink in order to provide the ink layer with good heat conductivity and melt transferability. Examples of this substance include carbonaceous substances such as carbon black and metal powders such as aluminum, copper, tin oxide and molybdenum disulfide. In the heat-sensitive transfer sheet according to the embodiment of the present invention, the ink layer is melted at 100 ° C. It consists of a hot-melt ink with a viscosity of 10 cps to 60 cps. The heat-meltable ink of the conventional heat-sensitive transfer sheet has a melt viscosity at 100 ° C. of about 100 to 150 cps. Therefore, the heat-meltable ink used in the embodiment of the present invention is
It has a low viscosity that has never been used before. By lowering the viscosity of the heat-meltable ink, wetting of the melted ink heated by the thermal head onto the transfer paper and the sealing effect of the printing area are improved, and contact between the transfer sheet and paper is incomplete. Ink can be easily transferred to the part, and high printing quality can be obtained. If the melt viscosity of the heat-meltable ink at 100 ° C exceeds 60 cps, the expected effect cannot be obtained, and if it does not exceed 10 cps, bleeding will occur and the print quality will rather deteriorate. The direct or indirect coating of the heat-fusible ink layer on the base film includes hot-melt coating, as well as ordinary printing or coating methods, specifically hot lacquer coating, gravure coating, gravure reverse coating, roll coating, gravure printing. , Barcodes and many other means. The thickness should be determined so as to balance the required print density and heat sensitivity, and is in the range of 0.1 to 30 μ, preferably 1 to 20 μ. Sealing Layer The sealing layer has a function of sealing the printed portion of the transferred paper at the time of transfer, and also has a function of preventing scumming of the printed portion. That is, at the time of printing, with a normal heat-sensitive transfer sheet, the transfer paper is liable to be smeared due to rubbing between the transfer paper and the heat-sensitive transfer sheet of the present invention having a sealing layer, even if it is rubbed. Since it is possible to prevent the ink layer from directly contacting the transfer-receiving paper only by attaching the surface layer portion of the sealing agent layer to the transfer-receiving paper, there is an advantage that stains do not occur. Further, when the coating film hardness of the filling layer is high (for example, carnauba wax, candelilla wax, etc.), the degree of adhesion to the transfer receiving paper is smaller, and the stain resistance is further increased. Further, in the present invention, "stopping" means not only (a) the case where the surface concave portion of the transfer paper is filled with the stopping agent to perform the sealing, but (b) the sealing agent keeps a film state. It moves to the transfer paper as it is, contacts the convex portion of the surface, sticks it to the concave portion and closes it like a bridge, so that the surface of the printed portion becomes smooth Including cases. In the present invention, the filler layer is made of wax and / or resin, and may contain an extender as needed. The melting point of the filling layer can be selected according to the temperature of the thermal head to be used, but is usually preferably in the range of 40 to 150 ° C. As typical examples of the wax, microcrystalline wax, carnauba wax, and paraffin wax are preferably used. In addition, Fischer-Tropsch wax, various low-molecular-weight polyethylenes and some modified waxes, fatty acid esters and amides, wood wax, beeswax, Whale wax, Ibota wax, wool wax, shellac wax, candelilla wax, petrolatum, vinyl ether wax such as octadecyl vinyl ether, etc.
Various waxes can be used. The wax used in the filling layer is the same or different from the wax used in the above-mentioned hot-melt ink layer. In a preferred embodiment of the present invention, both kinds of wax can be made of different types as follows. That is, a filler layer is provided on the hot-melt ink layer, both use a vehicle such as a relatively low-melting wax, and the hot-melt ink layer has a relatively low melting point, for example, 40 to 80 ° C.
As a result, the thermal sensitivity of the ink is increased and high-speed thermal transfer is possible.On the other hand, the sealing layer in contact with the transfer receiving paper has a relatively high melting point, for example, 50 to 100 ° C., so that a high energy level can be obtained. In the thermal transfer, the occurrence of print blurring is reduced. Therefore, an appropriate combination can be determined so that the above-mentioned conditions of the melting point range and the difference between the melting points, for example, 10 to 60 ° C. are satisfied. Examples of the resin used for the sealing layer include polyethylene, chlorinated polyethylene, chlorosulfonated polyethylene, ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ionomer, polypropylene, polystyrene, and styrene. -Acrylonitrile copolymer (AS resin), ABS resin, polyvinyl chloride, polyvinylidene chloride, vinyl chloride-acrylonitrile copolymer, vinylidene chloride-acrylonitrile copolymer, vinyl chloride-vinyl acetate copolymer, vinyl chloride-propion Vinyl acid copolymer, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, polybutene resin, acrylic resin, fluororesin, isobutylene-maleic anhydride copolymer, polyamide resin, nitrile rubber, acrylic rubber, polyisobutylene resin, polyisobutylene resin Carbonate resin, polyacetal resin, polyalkylene oxide, saturated polyester resin, silicon resin, phenol resin, urea resin, unsaturated polyester resin, diacrylic phthalate resin, epoxy resin, polyurethane resin, modified rosin, rosin, hydrogenated rosin, rosin ester Resin, maleic acid resin, ketone resin, xylene resin, vinyltoluene butadiene resin, polycaprolactone resin, ethyl cellulose resin, polyvinyl formal resin, acetyl cellulose resin, maleic acid resin, vinyltoluene acrylate resin, terpene resin, aliphatic resin, Aromatic, copolymer or alicyclic petroleum resin, cellulose derivatives such as methyl cellulose, hydroxyethyl cellulose and nitrocellulose, and their copolymers, blend poly There are mars. It is recommended to add an appropriate amount of extender to the filling layer. Thereby, blurring or tailing of the print can be prevented. Particles with too large a particle size are inappropriate for the extender pigment. Suitable as extenders are inorganic fillers such as silica, talc, calcium carbonate, precipitated barium sulfate, alumina, titanium white, clay, magnesium carbonate or tin oxide. The blending amount of the extender is small, but the effect is poor.
If it exceeds 60%, the dispersibility is lowered and it becomes difficult to adjust the ink, or the coated material tends to fall off from the base film. Therefore, it is preferable to add 0.1 to 60% by weight. As described above, the filler layer is configured with or without the addition of a coloring agent (eg, a dye or a pigment) as necessary.
If a colorant is used, it will overlap with the colorant in the ink layer to provide a record of sufficient density, and if only a colorless vehicle is used,
It is possible to prevent the transfer paper and the ink layer from directly contacting and rubbing each other, thereby causing a background stain. In addition, when a colorant having concealing properties, such as titanium white, is used, there is an effect of concealing the base, which is advantageous in that the color of the transfer ink is clearly clarified. The coating of the fill layer can also be made by various techniques. It is appropriate that the thickness of this layer is about 0.1 to 30 μm. Heat-resistant protective layer When a heat-sensitive material is used as the base film, or when printing or high-speed printing in a low-temperature atmosphere, the energy and temperature transmitted from the thermal head become high. It is preferable to provide a layer for preventing sticking of the thermal head. The heat-resistant protective layer has an important function in preventing sticking and blocking during transfer and facilitating printing. This heat resistant protective layer is formed on the surface of the base film on the side opposite to the side on which the heat fusible ink layer is provided. The heat resistant protective layer has the following two modes. (I) The heat-resistant protective layer according to the first aspect uses a composition comprising (a) a thermoplastic resin having an OH group or a COOH group, (b) a polyamine or polyisocyanate, and (c) a thermoplastic resin. Consists of In the above, as the thermoplastic resin having an OH group or a COOH group, polyester resin, vinyl chloride / vinyl acetate copolymer, polyether resin, polybutadiene resin,
It is desirable to select from acrylic polyol, urethane or epoxy prepolymer having OH group, nitrocellulose resin, cellulose acetate propionate resin, cellulose acetate butyrate resin, cellulose acetate resin, or the like. The above resin may have an OH or COO group in its polymerized unit, or may have an unreacted OH group or COOH group at the terminal or side chain. In the thermoplastic resin having the above OH group or COOH group,
Further, polyisocyanate or polyamine is added. These polyisocyanates or polyamines are added in order to cure the above thermoplastic resin having an OH group or a COOH group to obtain good sticking resistance. As the polyisocyanate, paraphenylene diisocyanate, 1-chloro-2,4-phenyl diisocyanate, 2-chloro-1,4-phenyl diisocyanate,
2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 1,5-naphthalene isocyanate, hexamethylene diisocyanate, 4,4′-biphenylene diisocyanate, etc., or triphenylmethane triisocyanate, 4,4 ′, 4 ″ -trimethyl Triisocyanates such as -3,3 ', 2 "-triisocyanate-2,4,6-triphenylcyanurate can be used. As the polyamine, melamine, methylated melamine, methylated methylolmelamine, butylated melamine, butylated methylolmelamine, dicyandiamide, guanidine, biguanide, dianomelamine, guanylmelamine, urea, biuret,
Ammeline, ammelide, butylated urea, methylated urea, and the like, and guanamines such as formoguanamine, acetoguanamine, benzoguanamine, phenylacetoguanamine, and methoxyguanamine, N-methylolacrylamide copolymer polymers, and the like can be used. When the above polyamine is used as a crosslinking agent, ammonium phosphate, triethanolamine, acetamide, urea, pyridine, paratoluenesulfonic acid, sulfanilic acid, guanidine stearate, guanidine carbonate or the like is used as a curing catalyst. The above polyisocyanate or polyamine is OH
It is preferable to add 5 to 40 parts by weight, preferably 10 to 20 parts by weight to 100 parts by weight of the thermoplastic resin having a group or a COOH group. If the amount of polyisocyanate or polyamine is less than 5 parts by weight, the degree to which the protective layer is cross-linked and cured is too low to obtain a good effect. On the other hand, if it exceeds 40 parts by weight, the polyisocyanate or polyamine itself is unreacted. It is apt to remain as a product and does not have sticking resistance per se, which is not preferable. Further, by adding the above-mentioned cross-linking agent to the thermoplastic resin having an OH group or a COOH group, the adhesive strength to the base film is increased as compared with the case where these cross-linking agents are not added. Further, the thermoplastic resin used to form the heat-resistant protective layer can also be selected from a wide range, but preferable examples include acrylic resin, polyester resin, vinylidene fluoride resin, vinylidene fluoride ~ Tetrafluorinated ethylene copolymer resin, polyvinyl fluoride resin, acrylonitrile-styrene copolymer resin, acrylic-vinyl chloride copolymer resin, nittle rubber, nylon, polyvinylcarbazole, chlorinated rubber, cyclized rubber, polyvinyl acetate resin, There are polyvinyl chloride resins and vinyl chloride-vinyl acetate copolymer resins. These resins have a glass transition temperature of 60 ° C.
It has been empirically known that the above is preferable. (II) The heat resistant protective layer according to the second aspect is mainly composed of a silicone modified resin. Specifically, the following are preferably used. (I) Silicone-modified acrylic resin (ii) Silicone-modified polyester resin (iii) Acrylic resin (iv) Polyester resin (v) Vinylidene fluoride resin (vi) Vinylidene fluoride-tetrafluoroethylene copolymer (vii) Polyfluoride Vinyl Resin (viii) Acrylic, Nitrile-Styrene Copolymer Resin To form a heat resistant protective layer using each of the above compounds, each compound was dissolved in an appropriate solvent and adjusted to a viscosity suitable for coating. After that, it may be applied to one surface of the base film by a known application method. The heat-resistant protective layer basically has the above constitution, but may be further modified as follows. For example, a primer layer may be provided to improve the adhesive force between the base film and the protective layer. The primer layer can be provided by using a known primer coating, for example, as a binder, acrylic resin, polyester resin, polyvinyl acetate resin, vinyl chloride / vinyl acetate resin, polyol and diisocyanate, polyol and melamine, epoxy resin. And a diisocyanate are preferably used, and when a primer coating containing these binders is used, an improvement in adhesive strength can be particularly expected when a polyester film is used as a base film. In order to improve the slippage of the print head in the heat-resistant protective layer, it is advisable to add a lubricant or a thermal release agent, such as waxes such as polyethylene wax and paraffin wax, higher fatty acid amides, higher fatty acid esters, higher fatty acid salts, and higher fatty acid salts. Alcohol, a first group such as phosphoric acid esters such as lecithin, powders such as fluororesins such as Teflon, vinyl fluoride resins, guanamine resins, boron nitride, silica,
A second group of wood flour, talc, etc. can be mentioned as an example. The above lubricants or thermal release agents can be used by arbitrarily mixing them, and it is desirable to add about 10 to 50% by weight to the protective layer. Addition of these lubricants or heat release agents is carried out by adding and kneading when the coating material for forming the protective layer is prepared. In the above, those belonging to the first group show the action of a lubricant or a mold release agent when they are melted by heating, and those belonging to the second group show the action of a lubricant or a thermal mold release agent in the form of a solid powder. is there. Release Layer The heat-sensitive transfer sheet according to the present invention is characterized in that a release layer is provided in order to improve the releasability between the base film and the ink layer, whereby transfer efficiency and print quality are improved. It also improves and also reduces peeling noise. Further, when the peeling layer remains on the surface of the ink layer after peeling off the ink layer, the peeling layer also functions as a protective layer of the printed portion and contributes to improvement of abrasion resistance of the printed image. The following materials can be preferably used as the material for forming the release layer. (A) Resin (i) Silicone resin. (Ii) A mixture of a silicone resin and a thermoplastic or thermosetting resin compatible with the silicone resin. (Iii) Silicone modified resin For example, silicone modified acrylic, silicone modified polyester and the like. (Iv) PVA, protein, amino acid resin, gelatin, vinylidene fluoride, polyethylene chloride, NC (nitrocellulose), CAB (cellulose acetate butyrate), CAP
(Cellulose acetate propionate) and NC / isocyanate, CAP / isocyanate, CAB / isocyanate, polyamine, polycaprolactone, etc. (B) Thermoplastic resin + release agent (i) Release agent Waxes such as silicone-modified wax, polyethylene, paraffin, and microcrystalline wax. Higher fatty acid, higher fatty acid amide, higher fatty acid ester, higher fatty acid salt. Higher alcohol. Phosphate esters such as lecithin. (Ii) Thermoplastic resin Acrylic resin, polyester resin, vinylidene fluoride resin, maleic acid resin, polyamine, polycaprolactone, vinylidene fluoride-tetrafluoroethylene copolymer resin, polyvinyl fluoride resin, acrylonitrile-styrene copolymer Resin, acrylic-vinyl chloride copolymer resin, nitrile rubber, nylon, polyvinylcarbazole, chlorinated rubber, cyclized rubber, polyvinyl acetate resin, polyvinyl chloride resin, vinyl chloride-vinyl acetate copolymer resin, etc. (C) Waxes (i) All waxes such as paraffin wax, microcrystalline wax, carnauba wax, montan wax, etc. (ii) Silicone-modified wax (iii) Higher alcohol (iv) Higher fatty acid, higher fatty acid amide, higher fatty acid ester, Higher fatty acid salt (v) Phosphate ester matte layer / matte processing such as lecithin Heat-sensitive transfer is generally glossy and beautiful on the print, but it may be difficult to read the document, so matte printing may be desirable. . In such a case, the base film is coated with a resin in which an inorganic pigment such as silica or calcium carbonate is dissolved in an appropriate solvent, coated with a mat layer, and then coated with a hot-melt ink. To form a thermal transfer sheet.
Alternatively, the base film itself may be used after matting. Needless to say, the present invention can be applied to a thermal transfer sheet for color printing, and a multicolor thermal transfer sheet is also included in the scope of the present invention. [Examples of the Invention] The present invention will be described in more detail below, but the present invention is not limited to these examples. Example 1 Using PET having a thickness of 3.5 μm as a base film, a transfer sheet having a release layer, an ink layer, a sealing layer and a sticking prevention layer having the following compositions was formed. Release layer: Silicon modified acrylic resin 40% xylene solution (Shin-Etsu Chemical
KR5208) 10 parts Toluene 40 parts Xylene 40 parts Butanol 15 parts It was applied at a rate of 0.1 g / m ² by the gravure coating method. Heat-fusible ink layer: Carbon black "SEAST S0" (Tokai electrode) 15 parts Ethylene / vinyl acetate copolymer "Eva Flex 310" (Mitsui Polychemicals) 10 parts Paraffin wax "Paraffin 150 ° F" 40 parts Carnauba wax 15 using parts attritor, a material obtained by 6 hours kneaded at 120 ° C., and 5 g / m ² coated with 120 ° C. hot melt roll coating method. Filling layer: Carnauba emulsion "WE-90" (hond wax 4%
Solid content) 10 parts 75% IPA aqueous solution 10 parts 1 g / m ^{2 was} applied by the gravure coating method. Anti-sticking layer: Vinylidene fluoride tetrafluoroethylene copolymer "Kainer K7201" (Penwald) 5 parts Polyester polyol "SP-1510" (Hitachi Kasei) 4 parts CAB "Serit BP700-25" (Bayer) 1 part polyethylene wax “FC-113” (Adeka Argus) 1 part Fluorocarbon (“F-57” (Axel) 0.5 part MEK 60 parts Toluene 30 parts 0.3 g / m ² (dry state, the same below) was applied by the gravure coating method. Method) Several types of high-quality paper with high smoothness to medium-quality paper with low smoothness were selected as the transfer paper, and printing was performed using a commercially available thermal head: Thermal head energy 0.7 mJ / dot, 40 characters / second As a result of printing evaluation, good transfer performance without scumming was shown, and printing without peeling noise was performed on all transfer papers.
Further, high quality printing was obtained even in a low temperature atmosphere (0 ° C.). Example 2 Using the same base film as in Example 1, a transfer sheet having a release layer and an ink layer having the following compositions was prepared. Release layer: Polyester resin “Vylon 200” (Toyobo) 10 parts Silicon modified wax “KF3935” (Shin-Etsu Chemical) 5 parts Methyl ethyl ketone (MEK) 50 parts Toluene 50 parts 0.1 g / m ^{2 was} applied by the gravure coating method. Hot-melt ink layer: The same as in Example 1. As a result of printing by the same method as in Example 1, good transfer performance without peeling noise was shown. Example 3 Release layer: Polyester resin "Vylon 200" (Toyobo) 10 parts Vinyl chloride / vinyl acetate copolymer "Vinylite VAGH"
(UCC) 8 parts Stearamide amide "Amide HT" (Lion Akzo) 3 parts Lecithin (Ajinomoto) 4 parts Toluene 100 parts MEK 120 parts 0.3 g / m ^{2 was} applied by the gravure coating method. Heat-fusible ink layer: Carbon black "SEAST S0" (Tokai electrode) 15 parts Ethylene / vinyl acetate copolymer "Evaflex 310" (Mitsui Polychemicals) 8 parts Paraffin wax 50 parts Carnauba wax 25 parts Same as Example 1 The method was applied. Example 4 Using the same base film as in Example 1, a transfer sheet having a release layer having the following composition, an ink layer, and a sealing layer was formed. Release layer: Montan wax 10 parts Xylene 50 parts Toluene 40 parts 0.7g by gravure coating while heated to 50 ° C
/ m ^{2 was} applied. Heat-fusible ink layer: A product obtained by reacting hexamethylene diisocyanate and ethyl alcohol in an equivalent amount (80 ° C, 10 hours) 30 parts Vinyl acetate "Esnile C-50" 6 parts Carbon black "SEAST SO" (Tokai Electrode) 6 parts Ethyl alcohol 50 parts IPA 20 parts 3 g / m ^{2 was} applied by the gravure coating method. Filling layer: 155 ° F paraffin wax emulsion (“WE-70”,
Bondwax Co., Ltd., solid content 40% aqueous emulsion) 10 parts 60% isopropanol aqueous solution 15 parts 1 g / m ^{2 was} applied by the gravure coating method. The obtained heat-sensitive transfer sheet was subjected to print evaluation in the same manner as in Example 1, and as a result, good transfer performance without scumming and peeling noise was shown. Further, in the case of this example, since the peeling layer remained on the surface of the printed portion after printing, this functioned as a protective layer and the abrasion resistance of the printed image was improved. Example 5 Using the same base film as in Example 1, a transfer sheet having a release layer and an ink layer having the following compositions was prepared. Release layer: Cellulose acetate propionate (A) (CAP482-05, Eastman Chemical) 10 parts (B) Diisocyanate (Takenate D-110W, Takeda Chemical) (A): (B) = 100: 3 mixed Then, 0.5 g / m ^{2 was} applied by the gravure coating method. Hot-melt ink layer: The same as in Example 1. Example 6 Using the same base film as in Example 1, a transfer sheet having a release layer and an ink layer having the following composition was prepared. Release layer: Polyamine resin (Reomide 2185, Kao soap) 10 parts IPA 100 parts 1 g / m ^{2 was} applied by the gravure coating method. Hot-melt ink layer: The same material as in Example 1 was applied at 3 g / m ² . In the case of this embodiment, since the peeling layer remains in the form of covering the surface of the printing portion after the transfer, the peeling layer also functions as a protective layer of the printing portion. As a result of printing in the same manner as in Example 1, good transfer performance without peeling noise was obtained, and printing with good abrasion resistance of the printed image was obtained. Example 7 Using the same base film as in Example 1, a transfer sheet having a primer layer, a release layer and an ink layer having the following compositions was prepared. Primer layer: Polyester polyol (PTI49002, manufactured by DuPont) 10 parts MEK 50 parts Toluene 50 parts 0.5 g / m ^{2 was} applied by a gravure coating method. Release layer: PVA205 (manufactured by Kuraray Co., Ltd.) 10 parts Water 60 parts Ethanol 40 parts 1 g / m ^{2 was} applied by the gravure coating method. Hot-melt ink layer: The same as in Example 1. When the release layer is formed using a material that is difficult to adhere to the PET base film, such as PVA, and has a high release property with the hot-melt ink layer, the base film and the release layer are formed as in this example. It is preferable to provide a primer layer between and to obtain the adhesiveness between them. In addition to this, as a method for improving the adhesiveness, there is a method in which the surface of the base film is subjected to corona treatment or plasma treatment by a conventional method. As a result of printing by the same method as in Example 1, good transfer performance without peeling noise was shown.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Kyoichi Yamamoto               7-29-5 Sagamidai, Sagamihara City (56) References JP-A-58-220795 (JP, A)                 JP 60-104394 (JP, A)                 JP-A-60-230893 (JP, A)                 JP-A-59-114098 (JP, A)                 JP-A-60-212392 (JP, A)                 JP 60-101083 (JP, A)                 JP-A-60-101084 (JP, A)

Claims (1)

(57) [Claims] In a heat-sensitive transfer sheet having a heat-meltable ink layer formed on one surface of a base film, a release layer made of wax is provided between the base film and the heat-meltable ink layer, and the heat-meltable ink layer is provided. Is composed of an ink having a melt viscosity of 10 cps to 60 cps at 100 ° C., and a sealing layer made of wax is formed on the surface of the heat-meltable ink layer to seal the printed portion of the transferred paper during transfer. The release layer is transferred together with the ink layer during transfer of the heat fusible ink layer,
Thermal transfer sheet. 2. The heat-sensitive transfer sheet according to claim 1, wherein a heat-resistant protective layer is provided on the surface of the base film on the side in contact with the thermal head. 3. The matte layer is provided between the heat-meltable ink layer and the peeling layer.
The heat-sensitive transfer sheet according to the item. 4. The heat-sensitive transfer sheet according to claim 1, wherein the surface of the base film on the ink layer side is matt-processed.