JP5737779B2 - Thermal recording sheet and method for producing the same - Google Patents

Description

  The present invention relates to a heat-sensitive recording sheet having a top coat layer on the surface side and a heat-sensitive layer below the surface, and a method for producing the heat-sensitive recording sheet.

  Thermal recording sheets are used in a wide range of applications for recording in thermal facsimiles, thermal printers, automatic ticket vending machines, etc., and thermal recording sheets with excellent gloss have also been proposed (see, for example, Patent Document 1). ).

Japanese Patent No. 4416989

  In recent years, the use of thermal recording sheets has been expanded to, for example, labels for food and beverages, various tickets for concerts, baseballs, etc., and those with higher decorativeness and design are increasingly required. ing.

  The present invention has been made paying attention to such a situation, and an object thereof is to provide a heat-sensitive recording sheet having improved decorativeness and design and a method for producing the same.

  In order to achieve the above object, the present invention is configured as follows.

(1) The thermosensitive recording sheet according to the present invention is a thermosensitive recording sheet for a label comprising at least a thermosensitive layer and a topcoat layer on a base material, and a pressure-sensitive adhesive layer is provided on the back side of the base material. A surface of the top coat layer is exposed, and an uneven hologram image is formed on the surface .

  The heat-sensitive recording sheet of the present invention comprises at least a heat-sensitive layer and a topcoat layer on a substrate, and other layers such as an undercoat layer may be provided between the substrate and the heat-sensitive layer. In addition, another layer such as an overcoat layer may be provided between the heat-sensitive layer and the topcoat layer.

  According to the heat-sensitive recording sheet of the present invention, since a hologram image is formed on the surface of the top coat layer, an excellent decorative effect can be exhibited from the three-dimensional beauty and gloss unique to the hologram. In addition, since the hologram is difficult to be copied by a copying machine, the security is improved.

  Furthermore, since the hologram image is formed on the top coat layer itself, it is not necessary to provide a separate hologram layer, the thickness of the heat-sensitive recording sheet is not increased, and the heat-sensitive recording characteristics are good.

(2) The method for producing a heat-sensitive recording sheet of the present invention is a method for producing a heat-sensitive recording sheet in which at least a heat-sensitive layer and a topcoat layer are formed on a substrate, and the unevenness fed from a film feeding device is The step of applying the material of the top coat layer to the hologram-processed film and drying to form the top coat layer; and on the top coat layer of the film on which the top coat layer is formed, The method includes a step of applying a material of the heat sensitive layer and drying to form the heat sensitive layer, and a step of peeling the film from the top coat layer.

  According to the method for producing a heat-sensitive recording sheet of the present invention, a topcoat layer material is applied to a hologram-processed film and dried to form a topcoat layer, and then the film is peeled from the topcoat layer. Thus, a thermal recording sheet having a hologram image transferred and formed on the surface of the topcoat layer can be easily obtained.

  The material of the heat sensitive layer may be applied directly on the base material, or may be applied indirectly through another layer formed on the base material.

  Moreover, the material of a topcoat layer may be apply | coated directly on a heat sensitive layer, and you may apply | coat indirectly through the other layer formed on the heat sensitive layer.

  As described above, according to the present invention, in the thermosensitive recording sheet including at least the thermosensitive layer and the topcoat layer on the substrate, the hologram image is formed on the surface of the topcoat layer. Excellent decorative effects can be demonstrated from the aesthetic appearance and gloss. Moreover, since the hologram is difficult to forge, the security is improved.

FIG. 1 is a schematic configuration diagram of a manufacturing apparatus for performing a manufacturing method according to an embodiment of the present invention. FIG. 2 is a schematic sectional view of a heat-sensitive recording sheet according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional view for explaining the manufacturing method of the reference example . FIG. 4 is a schematic cross-sectional view of a thermosensitive recording sheet according to another embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a manufacturing apparatus for performing a method for manufacturing a thermal recording sheet according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view of the thermal recording sheet manufactured by the manufacturing method. .

  The thermal recording sheet manufacturing apparatus 1 of this embodiment includes a film delivery apparatus 2 for delivering a film 3 subjected to hologram processing, a topcoat material application roller 4 for applying a topcoat material to the delivered film 3, A drying device 6a that dries the film 3 on which the topcoat material is applied, a heat-sensitive coloring material application roller 8 that applies a heat-sensitive coloring material to the topcoat layer 5 formed on the film 3, and a heat-sensitive coloring material. A drying device 6b for drying the applied film 3, a bonding roll 11 for bonding the film 3 on which the heat-sensitive layer 7 or the like from the drying device 6b is formed and the base material 10 fed from the base material feeding device 9, A peeling device 12 for peeling the film 3 from the top coat layer 5 and a film winding roller for winding the peeled film 3 And 3, a take-up roller 14 that the heat-sensitive recording sheet 20 of this embodiment is obtained by peeling off the film 3 is wound, a.

  The film delivery device 2 is wound and accommodated with a film 3 having a hologram processed on the surface thereof. The film 3 is sent out from the film sending device 2 in the direction of arrow A, and the process described below is performed on the surface 3a of the film 3 in the course of being sent out. An uneven hologram pattern (hologram image) is formed on the surface 3a of the film 3 by hologram processing. Examples of the material of the film 3 include PET (polyethylene terephthalate), biaxially stretched polypropylene such as OPP (oriented polypropylene), and polyvinyl alcohol.

  The film 3 is fed in the direction of arrow A from the film delivery device 2, and as a first treatment, a top coat material for forming the top coat layer 5 is applied to the surface 3a by the top coat material application roller 4. Is done. A top coat material is preferably applied to the surface 3a of the film 3 so that the thickness of the dried top coat layer 5 is 0.3 μm or more. If it does in this way, a hologram image can fully be transcribe | transferred from the film 3 to which the hologram process was given. The top coat layer 5 is a layer facing the thermal head as a heat-sensitive recording sheet, and is a layer related to decorativeness and design.

  After the top coat material is applied to the surface 3a of the film 3 by the top coat material application roller 4, the film 3 is sent to the drying device 6a arranged in the direction of the arrow A, and is dried by the drying device 6a. The film 3 is removed by drying a solvent such as moisture or an organic solvent by the drying device 6a. By drying with this drying device 6a, before applying the heat-sensitive color forming material with the heat-sensitive color forming material application roller 8 which is the next process to form the heat-sensitive layer 7, the solvent is removed from the surface 3a, thereby making the heat sensitive. The layer 7 can be easily formed, and a phenomenon in which the solvent affects the heat-sensitive color former of the heat-sensitive layer 7, that is, a so-called fog phenomenon can be avoided.

  In this way, the top coat material is applied to the surface 3 a of the film 3 by the top coat material application roller 4 and dried by the drying device 6 a to form the top coat layer 5. Then, the film 3 is guided to the thermosensitive coloring material application roller 8. It is burned. It should be noted that the drying device may be provided by providing a heat absorbing roll between the drying device 6a and the heat-sensitive coloring material application roller 8, or by increasing the distance between the drying device 6a and the heat-sensitive coloring material application roller 8. The heat applied in 6a may be dissipated to further reduce the thermal influence on the thermosensitive coloring material.

  The film 3 sent to the heat-sensitive coloring material application roller 8 is coated with a heat-sensitive coloring material on the surface of the topcoat layer 5 by the heat-sensitive coloring material application roller 8. In this way, the film 3 having the surface of the top coat layer 5 coated with the thermosensitive coloring material is guided to another drying device 6b, and dried there to form the heat sensitive layer 7 on the surface of the top coat layer 5. Then, it is sent out to the joining roll 11.

  A base material 10 is wound and stored in the base material feeding device 9, and the base material 10 is fed from the base material feeding device 9 to the joining roll 11 in the direction of arrow B, and an adhesive is applied by a coating device (not shown). , Provided by transfer or the like. This base material 10 is an elongate base material which consists of paper, a synthetic paper, a film, a sheet | seat etc., for example, and there is no restriction | limiting in particular.

  The base material 10 fed from the base material feeding device 9 and provided with an adhesive and the film 3 on which the heat-sensitive layer 7 dried by the drying device 6b is joined by the joining roll 11, and here the base material After 10 and the film 3 are joined, they are sent out in the direction of arrow C. A peeling device 12 is disposed in the feeding direction. The peeling device 12 peels the film 3 from the topcoat layer 5. The film 3 peeled off by the peeling device 12 is sent out in the direction of arrow D, and taken up by the film take-up roller 13 arranged in the feeding direction. Thus, the film 3 wound up by the film winding roller 13 can be reused.

  On the other hand, on the substrate 10 side from which the film 3 has been peeled, the surface of the topcoat layer 5 is exposed, and the heat-sensitive recording sheet 20 of this embodiment is obtained, which is sent out in the direction of arrow E and taken up by the take-up roller 14. It is done. The heat-sensitive recording sheet 20 wound up in this way is composed of the base material 10, the heat-sensitive layer 7 and the topcoat layer 5. Then, on the surface 5a of the top coat layer 5 of the thermosensitive recording sheet 20, a concavo-convex hologram image transferred from the hologram image on the surface 3a of the film 3 subjected to hologram processing is formed as shown in FIG. Yes.

  In this embodiment, although the base material 10 is provided with an adhesive and bonded to the film 3 on which the heat-sensitive layer 7 is formed, as another embodiment of the present invention, a heat-sensitive coloring material is applied to the surface of the topcoat layer 5. Then, before drying the thermosensitive coloring material, it may be bonded to the substrate 10.

  The peeling of the film 3 in the peeling device 12 may be performed continuously after joining, or the film 3 is peeled off after the base material 10 is wound into a roll once the film 3 is present. Also good. By winding and holding the base material 10 while the film 3 is present, the surface of the thermosensitive recording sheet 20 on the topcoat layer 5 side can be protected until it is used as the thermosensitive recording sheet 20.

  As a material for forming the top coat layer 5, a filler, a lubricant and a crosslinking agent are added to the binder, and additives such as a dispersant, an antifoaming agent, a water-resistant agent, and an ultraviolet absorber are added as necessary. The added one is used.

  Examples of the resin as the binder include polyvinyl alcohol, modified polyvinyl alcohol, starch, modified starch, casein, gelatin, glue, gum arabic, polyamide, polyacrylamide, modified polyacrylamide, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, hydroxypropyl Cellulose, polyvinyl acetate, polyacrylate, styrene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer, diisobutylene-maleic anhydride copolymer, vinyl acetate-maleic anhydride copolymer, methyl Vinyl-maleic anhydride copolymer, isopropylene-maleic anhydride copolymer, styrene-butadiene copolymer, polyvinyl chloride, polyvinylidene chloride, vinyl chloride-vinyl acetate copolymer , Polyurethanes, polystyrenes, polyvinyl pyrrolidone, acrylic acid esters, acrylonitrile, can be used by selecting one or more kinds of water-soluble resin or emulsion, such as methyl vinyl ether.

  One type or two or more types can be selected from the above-described resins, and for example, those dissolved in a solvent such as ethyl acetate, isopropyl alcohol, and toluene can be used.

  The fillers include kaolin such as colloidal silica, aluminum hydroxide, aluminum oxide, aluminum silicate, heavy calcium carbonate, light calcium carbonate, titanium oxide, barium sulfate, silica gel, activated clay, talc, clay, and kaolinite. , Diatomaceous earth, white carbon, magnesium carbonate, magnesium oxide, magnesium hydroxide, zinc oxide, polystyrene resin particles, urea-formalin resin particles, polyolefin resin particles and the like can be selected and used. .

  Furthermore, as lubricants, fatty acids such as oleic acid, oxidized waxes such as paraffin wax, polyolefin waxes such as polyethylene wax, metal soaps such as zinc stearate, ester waxes such as carnauba wax, silicon oil, whale oil These oils can be used by selecting one kind or two or more kinds.

  In addition, as a crosslinking agent, dioxels such as glyoxal, polyaldehyde, amino-formaldehyde, polyamines such as polyethyleneamine, polyimines such as polyethyleneimine, epoxy, epicyclohydrin resin, polyamide resin, glycerin diglycidyl One kind or two or more kinds of diglycidyl series such as ether and zirconium salt such as zirconium ammonium carbonate can be selected and used. In addition, either one of zirconium carbonate ammonium salt and epicyclohydrin resin can be used as a crosslinking agent, and zirconium carbonate ammonium salt and epicyclohydrin resin are blended at a ratio of 4: 1. You can also.

  As a composition of the material forming the top coat layer 5, the binder is preferably 10 to 90% by weight, more preferably 25 to 75% by weight, and the filler is preferably 1 to 50% by weight, more Preferably 15 to 40% by weight, lubricant is preferably 1 to 30% by weight, more preferably 10 to 25% by weight, and crosslinking agent is preferably 1 to 20% by weight, more preferably 3 to 10% by weight. .

  The composition of the material of the top coat layer 5 of this embodiment is that the binder is 60% by weight, the filler is 25% by weight, the lubricant is 10% by weight, and the crosslinking agent is 5% by weight.

  As a material for forming the heat-sensitive layer 7, a sensitizer, a lubricant, and the like can be contained in addition to a color former, a developer, and a binder that develop color by heating.

  Here, as the color former that develops color by heating, a commonly used known leuco dye can be used. As this leuco dye, for example, 3- (N-isopentyl-N-ethyl) amino- 6-methyl-7-o-chloroanilinofluorane, 3-dipentylamino-6-methyl-7-anilinofluorane, 3-jetylamino-6-methyl-7-p-toluidinofluorane, crystal violet Lactone, 3- (N-ethyl-N-isopentyl) amino-6-methyl-7-anilinofluorane, 3-jetylamino-6-methyl-7-anilinofluorane, 3- (N-ethyl-N- p-toluidino) -6-methyl-7-anilinofluorane, 3-pyrrolidino-6-methyl-7-anilinofluorane, 3-di (n-butyl) amino 6-methyl-7-anilinofluorane, 3- (N-cyclohexyl-N-methyl) amino-6-methyl-7-anilinofluorane, 3-jetylamino-7- (o-chloroanilino) fluorane, 3- Dibutylamino-7- (o-chloroanilino) fluorane, 3-jetylamino-7- (m-trifluoromethylanilino) fluorane, 3-dimethylamino-5-methyl-7-methylfluorane, 3- (N-methyl) -Nn-propyl) amino-6-methyl-7-anilinofluorane, 3- (N-isobutyl-N-ethyl) amino-6-methyl-7-anilinofluorane, 3- (N-ethoxy) Propyl-N-ethyl) amino-6-methyl-7-anilinofluorane, 3-dibutylamino-6-methyl-7-bromofluorane, 3-jet Amino-6-methyl-8-methyl-fluoran, 3- Jechiruamino-7-chloro-fluoran and the like may be used alone or in combination of two or more.

  In addition, as the developer, various electron accepting substances that react with the leuco dye as described above when heated to develop color can be used. For example, commonly used bentonite , Zeolite, acid clay, activated clay, silica gel, zinc oxide, zinc chloride, zinc bromide, aluminum chloride, salicylic acid, 3-tert-butylsalicylic acid, 3,5-di-tert-butylsalicylic acid, di-m-chlorophenylthio Urea, di-m-trifluoromethylphenylthiourea, di-phenylthiourea, salicylanilide, 4,4'-isopropylidenediphenol, 4,4'-isopropylidenebis (2-chlorophenol), 4,4 ' -Isopropylidenebis (2,6-dibromophenol), 4,4'-isopropylidenebis (2,6-dichloro) Phenol), 4,4′-isopropylidenebis (2-methylphenol), 4,4′-isopropylidenebis (2,6-dimethylphenol), 4,4′-isopropylidenebis (2-tert-butylphenol) ), 4,4′-sec-butylidene dipheseal, 4,4′-cyclohexylidenebisphenol, 4,4′-cyclohexylidenebis (2-methylphenol), 4-tert-butylphenol, 4- Phenylphenol, 4-hydroxydiphenoxide, α-naphthol, β-naphthol, dimethyl 5-hydroxyphthalate, methyl-4-hydroxybenzoate, 4-hydroxyacetophenone, novolak-type phenol resin, 2,2′- Thiobis (4,6-dichlorophenol), catechol, resorcin, hydroquinone, Gallol, phloroglysin, phloroglysin carboxylic acid, 4-tert-octylcatechol, 2,2′-methylenebis (4-chlorophenol), 2,2′-methylenebis (4-methyl-6-tert-butylphenol), 2 , 2'-dihydroxydiphenyl, ethyl p-hydroxybenzoate, propyl p-hydroxybenzoate, butyl p-hydroxybenzoate, benzyl p-hydroxybenzoate, p-hydroxybenzoic acid-p-chlorobenzyl, p-hydroxy Benzoic acid-o-chlorobenzyl, p-hydroxybenzoic acid-p-methylbenzyl, p-hydroxybenzoic acid-n-octyl, benzoic acid, zinc salicylate, 1-hydroxy-2-naphthoic acid, 2-hydroxy-6- Naphthoic acid, zinc 2-hydroxy-6-naphthoate, 4-hydroxy Cidiphenyl sulfone, 4,2′-diphenol sulfone, 4-hydroxy-4′-chlorodiphenyl sulfone, 4-hydroxy-4′-benzyloxydiphenyl sulfone, 4-hydroxy-4′-isopropoxydiphenyl sulfone, 4-hydroxy-4'-isobutyloxydiphenylsulfone, bis (4-hydroxyphenyl) sulfide, 2-hydroxy-p-toluic acid, zinc 3,5-di-tert-butylsalicylate, 3,5-di-tert -Tin butylsalicylate, tartaric acid, oxalic acid, maleic acid, citric acid, succinic acid, stearic acid, 4-hydroxyphthalic acid, boric acid, biimidazole, hexaphenylbiimidazole, carbon tetrabromide, methylenebis- (oxyethylenethio ) Diphenol, ethylenebis- (oxyethylenethio) ) Diphenol, bis- (4-hydroxyphenylthioethyl) ketone, bis- (4-hydroxyphenylthioethyl) ether, m-xylylene bis (4-hydroxyphenylthio) ether, and the like can be used.

  Further, as the binder of the heat-sensitive layer 7, known ones that are generally used can be used. For example, polyvinyl alcohol, modified polyvinyl alcohol, starch, modified starch, casein, gelatin, glue, gum arabic, polyamide, poly Acrylamide, modified polyacrylamide, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose, polyvinyl acetate, polyacrylate, styrene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer, diisobutylene-maleic anhydride Acid copolymer, vinyl acetate-maleic anhydride copolymer, methyl vinyl-maleic anhydride copolymer, isopropylene-maleic anhydride copolymer, styrene-butadiene copolymer, poly Fluoride, polyvinylidene chloride, vinyl chloride - vinyl acetate copolymer, polyurethane, polystyrene, polyvinyl pyrrolidone, acrylic acid esters, acrylonitrile, can be used singly or two or more aqueous resin such as methyl vinyl ether.

  Moreover, the well-known thing generally used can also be used for the sensitizer, the lubricant, etc. to be contained in the heat-sensitive layer 7. Examples of the sensitizer include 1,2-bis- (3-methylphenoxy) ethane, waxes, higher fatty acids, higher fatty acid amides, higher fatty acid anilides, naphthol derivatives, naphthalene derivatives, aromatic ethers, aromatics. Carboxylic acid derivatives, aromatic sulfonic acid ester derivatives, carbonic acid or oxalic acid diester derivatives, biphenyl derivatives, polyether derivatives, terphenyl derivatives, sulfone derivatives, etc., solids at room temperature, preferably those having a melting point of about 70 ° C. or higher Can be used. Examples of the lubricant include fatty acids such as paraffin wax and oleic acid, polyolefin waxes such as polyethylene wax, metal soaps such as zinc stearate, ester waxes such as carnauba wax, and oils such as silicon oil and whale oil. These can be used alone or in combination of two or more.

  As described above, the thermal recording sheet 20 of this embodiment is formed by applying the topcoat material to the hologram-processed film (hologram film) 3 and drying it to form the topcoat layer 5. By peeling the film 3 from the layer 5, it is possible to easily obtain the thermosensitive recording sheet 20 in which the hologram image is transferred and formed on the surface of the topcoat layer 5.

  This heat-sensitive recording sheet 20 can exhibit an excellent decorative effect from the three-dimensional beauty and gloss peculiar to the hologram.

  For example, when the thermosensitive recording sheet 20 is used for labels or seals of containers such as various beverages and groceries, by selecting the pattern or color of the hologram, it is possible to enhance the freshness of the soft drinks and the luxury of meat. The product can be differentiated from similar products by the so-called eye-catching effect, and sales of the products can be promoted. For such a label, a logo such as a company name can be constituted by a hologram, and the logo can be made clear by the three-dimensional beauty of the hologram. In addition, various items such as product names and patterns can be configured by holograms.

  Also, the hologram image is different depending on the viewing angle, and it is difficult to copy with a copying machine. Therefore, when used for various tickets such as concerts and baseball, forgery is difficult and security is improved. improves.

  Further, since the hologram image is formed on the topcoat layer 5 itself, it is not necessary to provide a separate hologram layer, the thickness of the thermosensitive recording sheet 20 is not increased, and the thermosensitive recording characteristics are good.

In the method for producing the heat-sensitive recording sheet of this embodiment, the topcoat material is applied to the film 3 that has been subjected to hologram processing and dried to form the topcoat layer 5, and further, the heat-sensitive layer 7 is formed. Although the film 3 was peeled off from the top coat layer 5, as a reference example, as shown in FIG. 3, a heat sensitive layer 7 was formed on a base material 10, and a top coat material was applied on the heat sensitive layer 7. While the coated surface is in a wet state, the film 3 on which hologram processing has been applied may be adhered and adhered to each other and dried to form the top coat layer 5, and then the film 3 may be peeled off from the top coat layer 5. In addition, formation of the heat sensitive layer 7 on the base material 10 may be formed directly on the base material 10 or may be formed through another layer, and the top coat layer 5 on the heat sensitive layer 7 may be formed. The formation may be performed directly on the heat-sensitive layer 7 or may be formed via another layer.

  FIG. 4 is a cross-sectional view of a thermal recording sheet 20a according to another embodiment of the present invention, and the same reference numerals are given to the portions corresponding to FIG.

  In this embodiment, the overcoat layer 15 and the protective layer 16 are formed after the topcoat layer 5 is formed and before the heat-sensitive layer 7 is formed.

  The overcoat layer 15, together with the topcoat layer 5, improves the matching of the thermal recording sheet 20 a to the thermal head so that the color development of the thermal layer 7 is performed smoothly. Layer 7 is protected.

  In this embodiment, the undercoat layer 17 is formed after the heat-sensitive layer 7 is formed. The undercoat layer 17 functions as a heat insulating layer that prevents the heat given from the thermal head from dissipating in order to develop the color of the heat sensitive layer 7 and as an elastic layer that provides cushioning properties.

  Further, a barrier layer 18 is provided on the back surface of the substrate 10. The barrier layer 18 is provided with a known pressure-sensitive adhesive layer (not shown) on the back surface of the barrier layer 18 when the thermal recording sheet 20a is used as a label, for example. It has a function of preventing the components of the pressure-sensitive adhesive layer from diffusing into the heat-sensitive layer 7 via the base material 10 and the undercoat layer 17.

  The protective layer 16 is made of, for example, polyvinyl alcohol, modified polyvinyl alcohol, starch, modified starch, casein, gelatin, glue, gum arabic, polyamide, polyacrylamide, modified polyacrylamide, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose, poly Vinyl acetate, polyacrylate, styrene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer, diisobutylene-maleic anhydride copolymer, vinyl acetate-maleic anhydride copolymer, methyl vinyl-anhydrous Maleic acid copolymer, isopropylene-maleic anhydride copolymer, styrene-butadiene copolymer, maleic acid copolymer, polyvinyl chloride, polyvinylidene chloride, vinyl chloride-vinyl acetate One or more of water-soluble resins or emulsions such as rubber copolymer, polyurethane, polystyrene, polyvinyl pyrrolidone, acrylate ester, acrylonitrile, methyl vinyl ether can be selected and used as a binder. It is formed so as to have excellent properties, chemical resistance, plasticizer resistance and the like.

  As the material for forming the overcoat layer 15, a material in which a filler is added to the binder, and additives such as a lubricant, a crosslinking agent, a dispersant, an antifoaming agent, and a water-resistant agent are added as necessary. It is done.

  Examples of the binder for forming the overcoat layer 15 include polyvinyl alcohol, modified polyvinyl alcohol, polyvinyl butyral; polyvinyl pyrrolidone; polyvinyl carbazole; starches; cellulose derivatives; alginate; acrylate ester, polyacrylamide, polymethyl methacrylate, One or more kinds of acrylic resins such as polybutyl methacrylate; alkyd resins; maleic acid resins; acrylonitrile resins; epoxy resins; polyester resins; polyamide resins;

  In addition, the fillers include aluminum hydroxide, aluminum oxide, aluminum silicate, heavy calcium carbonate, light calcium carbonate, titanium oxide, barium sulfate, silica gel, activated clay, talc, clay, kaolinite and other kaolin, diatomaceous earth. , White carbon, magnesium carbonate, magnesium oxide, magnesium hydroxide, zinc oxide, polystyrene resin particles, urea-formalin resin particles, polyolefin resin particles and the like can be selected and used.

  As a material for forming the undercoat layer 17, a filler is added to the binder, and additives such as a crosslinking agent, a dispersant, an antifoaming agent, a water-resistant agent, and an ultraviolet absorber are added as necessary. Is used.

  When the undercoat layer 17 is formed, for example, polyvinyl alcohol, modified polyvinyl alcohol, starch, modified starch, casein, gelatin, glue, gum arabic, polyamide, polyacrylamide, modified polyacrylamide, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, Hydroxypropyl cellulose, polyvinyl acetate, polyacrylic ester, styrene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer, diisobutylene-maleic anhydride copolymer, vinyl acetate-maleic anhydride copolymer , Methyl vinyl-maleic anhydride copolymer, isopropylene-maleic anhydride copolymer, styrene-butadiene copolymer, maleic acid copolymer, polyvinyl chloride, polyvinyl chloride One or more water-soluble resins or emulsions such as water, vinyl chloride-vinyl acetate copolymer, polyurethane, polystyrene, polyvinyl pyrrolidone, acrylate ester, acrylonitrile, methyl vinyl ether can be selected and used as a binder. it can.

  In addition, the fillers include aluminum hydroxide, aluminum oxide, aluminum silicate, heavy calcium carbonate, light calcium carbonate, titanium oxide, barium sulfate, silica gel, activated clay, talc, clay, kaolinite and other kaolin, diatomaceous earth. , White carbon, magnesium carbonate, magnesium oxide, magnesium hydroxide, zinc oxide, polystyrene resin particles, urea-formalin resin particles, polyolefin resin particles and the like can be selected and used.

  The barrier layer 18 is made of, for example, polyvinyl alcohol, modified polyvinyl alcohol, starch, modified starch, casein, gelatin, glue, gum arabic, polyamide, polyacrylamide, modified polyacrylamide, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose, poly Vinyl acetate, polyacrylate, styrene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer, diisobutylene-maleic anhydride copolymer, vinyl acetate-maleic anhydride copolymer, methyl vinyl-anhydrous Maleic acid copolymer, isopropylene-maleic anhydride copolymer, styrene-butadiene copolymer, maleic acid copolymer, polyvinyl chloride, polyvinylidene chloride, vinyl chloride-vinyl acetate One or more of water-soluble resins or emulsions such as rubber copolymer, polyurethane, polystyrene, polyvinyl pyrrolidone, acrylic acid ester, acrylonitrile, methyl vinyl ether, etc. can be selected and used as a binder. It is formed so as to have excellent properties, chemical resistance, plasticizer resistance and the like.

  Other configurations and effects are the same as those of the above-described embodiment.

  Each layer such as the overcoat layer 15 can be provided as necessary.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus of thermal recording sheet 3 Film 5 Topcoat layer 7 Thermal layer 10 Base material 15 Overcoat layer 16 Protective layer 17 Undercoat layer 18 Barrier layer 20, 20a Thermal recording sheet

Claims (2)

A thermosensitive recording sheet for a label comprising at least a thermosensitive layer and a topcoat layer on a substrate,
An adhesive layer is provided on the back side of the substrate,
A heat-sensitive recording sheet, wherein the surface of the topcoat layer is exposed and a concavo-convex hologram image is formed on the surface . A method for producing a thermosensitive recording sheet in which at least a thermosensitive layer and a topcoat layer are formed on a substrate,
A step of applying the material of the topcoat layer to the film subjected to the hologram processing of the unevenness sent out from the film sending device , and drying to form a topcoat layer;
Applying the heat-sensitive layer material on the top-coat layer of the film on which the top-coat layer is formed, and drying to form a heat-sensitive layer; and
Peeling the film from the topcoat layer;
A method for producing a heat-sensitive recording sheet, comprising:

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