JP2005297451A - Thermal transfer accepting sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal transfer accepting sheet which is free from double feed or a paper jam due to static electricity, adhesion of a back layer with a ribbon at the time of back printing, or others, on the occasion of image recording by a thermal transfer printer. <P>SOLUTION: The thermal transfer accepting sheet has a sheetlike substrate, an accepting layer formed on the surface of the substrate and containing a dyeing resin as a main constituent and a back coating layer formed on the back side of the substrate. The back coating layer contains a copolymer of a polyoxyalkylene acrylate compound/an N-perfluoroalkylsulfonylamino acrylate compound. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a thermal transfer receiving sheet (hereinafter referred to as “receiving sheet”) used for a dye thermal transfer printer or the like. More specifically, the present invention relates to a receiving sheet that is excellent in antistatic properties in various environments, does not cause double feeding due to static electricity, and has good backside printability and water resistance.

  In the dye thermal transfer method, the ink ribbon and the receiving sheet are overlapped, and the sublimable dye on the ink ribbon is transferred onto the receiving layer of the receiving sheet by the heat supplied from the heating means such as the thermal head of the printer. Separately, an image is formed on the receiving layer of the receiving sheet. Recently, there has been a demand for a high-speed and high-sensitivity printing system, and it has become an important technical issue how to efficiently use the heat generated by the heating device of the thermal head for image formation. Therefore, in order to reduce heat loss, the base material of the receiving sheet is provided with a coating layer mainly composed of a thermoplastic resin having a high heat insulating property, or a plastic film is laminated and used. Further, a thermoplastic resin film is usually used for the base material of the ink ribbon, and a dye-dyeing resin is also used for the receiving layer for forming an image.

  For this reason, the receiving sheet used in the dye thermal transfer method is generally highly charged, and the receiving sheet double feed or paper jam occurs due to static electricity generated by the feeding and discharging movement of the receiving sheet inside the printer. It is in trouble. Therefore, antistatic is an important issue to be solved for dye thermal transfer printing systems. Therefore, it is required that the surface (back surface) opposite to the surface having the receiving layer of the receiving sheet has antistatic properties in order to prevent double feeding or paper jam due to static electricity.

  While the thermal transfer system has been increased in speed and sensitivity, the amount of heat generated during printing from the thermal head to the receiving sheet tends to increase, while the problem of back printing has occurred. That is, when the user mounts the receiving sheet on the thermal transfer printer, if the front and back sides of the receiving sheet are mistakenly mounted and printed, the heat of the thermal head causes the ink ribbon and the back side of the receiving sheet to be fused, resulting in a paper jam. Therefore, the back side of the receiving sheet is required to have anti-fusing property because the ink ribbon back side layer is discharged without fusing even during back printing.

It has been known so far to add various antistatic agents in order to impart antistatic properties to the back layer of the receiving sheet. Antistatic agents include electrically conductive inorganic fine powder, carbon fine powder, anionic surfactant, cationic surfactant, nonionic surfactant, amphoteric surfactant, cationic conductive resin, anion Type conductive resins have been proposed.
For example, zinc oxide and tin oxide are listed as conductive inorganic fine particles (see, for example, Patent Document 1), but the price is high, and the conductive agent is often dark, such as black, and can be obtained as a result. There was a drawback that the appearance of the receiving sheet was inferior.

  As an antistatic agent, a polymer of an acrylate monomer having a quaternary ammonium group is mentioned (see, for example, Patent Document 2). However, a cationic conductive resin is expensive, and other than adhesives and the like. There are disadvantages such as inferior compatibility with the combination material and generation of amine odor during thermal decomposition. Further, it is disclosed that an anionic polymer substance and / or conductive particles are contained as an antistatic agent (see, for example, Patent Document 3), and polystyrene sulfonate soda is cited as an anionic polymer substance. However, there are drawbacks such as inferior electrical conductivity and insufficient coating water resistance. Thus, nothing has been satisfied so far for the antistatic properties required for the back layer.

  On the other hand, it is known to add various release agents in order to impart anti-fusing properties to the back layer of the receiving sheet. For example, a technique is disclosed in which releasability is imparted to the back surface by using inorganic or organic particles and a higher fatty acid salt in combination on the back surface layer (see, for example, Patent Document 4). Inferior, when the amount added is increased in order to exhibit sufficient releasability, the binder ratio is lowered and the back layer coating film strength is insufficient.

Moreover, the technique which contains a fluorine compound as a mold release agent in a back surface layer is disclosed (for example, refer patent documents 5 and 6), and fluorine resin powder, a fluorine-containing acrylic resin, and a fluorine-type surfactant are mentioned. Furthermore, a technique containing a fluorine-containing graft copolymer in the back layer is disclosed (for example, Patent Document 7), and a copolymer resin containing an acrylate having a fluoroalkyl group as an ester in the main chain is shown.
However, none of the mold release agents listed in Patent Documents 5 to 7 has sufficient release properties.

JP-A-11-151866 (page 2-3) JP-A-5-64977 (page 2-3) JP-A-5-58064 (page 2-3) JP-A-1-241491 (first page) JP-A-6-127163 (page 2-3) Japanese Patent Laid-Open No. 5-208564 (page 2-3) Japanese Patent Laid-Open No. 8-276664 (page 2-3)

  The present invention improves the above problems and provides a thermal transfer receiving sheet that does not cause double feeding due to static electricity, paper jams, or fusion between the back layer and the ribbon during back printing during image recording using a thermal transfer printer. It is what.

(1) It has a sheet-like support, a receiving layer formed on the surface of the support and containing a dyeable resin as a main component, and a back coating layer formed on the back of the support A thermal transfer receiving sheet, wherein the back coating layer contains an acrylic acid polyoxyalkylene compound / acrylic acid N-perfluoroalkylsulfonylamino compound copolymer.
(2) The thermal transfer receiving sheet according to item (1), wherein the sheet-like support has cellulose pulp as a main component and has a low-density layer containing hollow particles between the sheet-like support and the receiving layer.

  The receiving sheet of the present invention has a low surface electrical resistance of the back coating layer, excellent releasability, no double feeding due to static electricity, no paper jam, and the back coating layer and the ink ribbon during back printing. There is no fusing, and the print runnability is very good.

The back layer of the present invention has a polyoxyalkylene acrylate compound / N-perfluoroalkyl acrylate for preventing double feeding and paper jams by an electrostatic machine and for preventing fusion between the back layer and the ribbon during back printing. Contains a sulfonylamino compound copolymer.
Acrylic acid polyoxyalkylene compound / acrylic acid N-perfluoroalkylsulfonyl compound copolymer, that is, copolymer of polyoxyalkylene group-containing (meth) acrylate monomer and perfluoroalkylsulfonylamino group-containing (meth) acrylate monomer (Hereinafter also referred to as “fluorine-containing copolymer”) has a repeating structure of a fluoroalkyl part having a hydrophobic group and a polyoxyalkylene part having a hydrophilic group, and acts as a surfactant.

  When the “fluorine-containing copolymer” is added to the back surface layer, fluoroalkyl portions having excellent surface tension reducing ability are arranged on the outside of the back surface layer, and high releasability and water repellency are exhibited. On the other hand, since the polyoxyalkylene parts having hydrophilicity are arranged on the inner side, a resin having a relatively high hydrophilicity in the back layer (for example, acrylic ester resin, polyester resin, epoxy resin, cellulose resin, acetal resin, butyral) Resin and the like) and good adhesion. Furthermore, the “fluorine-containing copolymer” has conductivity by acting as a surfactant and also exhibits an antistatic effect.

  One type of the polyoxyalkylene compound / acrylic acid N-perfluoroalkylsulfonylamino compound copolymer used in the present invention is a fluorine-containing copolymer represented by the following general formula (1).

式中、各Ｒは互いに独立してＨ又はメチル基であり、Ｒ_１は炭素数１〜５のアルキレン基であり、ｐは整数、好ましくは２０以下の整数であり、ｐが２以上の場合、互いに異なる炭素数のアルキレン基のＲ_１を含んでもよい。Ｒ_２は炭素数１〜５のアルキル基であり、Ｒ_２はヒドロキシ基で置換されていてもよい。Ｒ_３は炭素数１〜２０のアルキレン基であり、Ｒ_４は炭素数１〜５のアルキル基であり、Ｒ_５は炭素数２〜１０のパーフルオロアルキル基である。−Ｘ−は、−Ｏ−、又は−ＯＣ（＝Ｏ）−等の結合を示す。
さらに好ましくは、各Ｒは互いに独立してＨ又はメチル基であり、Ｒ_１は炭素数２又は３のアルキレン基であり、Ｒ_２は炭素数２又は３のアルキル基であり、Ｒ_２はヒドロキシ基で置換されていてもよく、Ｒ_３は炭素数１〜３のアルキレン基であり、Ｒ_４は炭素数２又は３のアルキル基であり、Ｒ_５は炭素数４〜８のパーフルオロアルキル基である。また、ｍ及びｎは整数、好ましくは５０以下の整数である。ｍとｎの比は特に制限されないが、フルオロアルキル部に起因すると思われる「離型性」とポリオキシアルキレン部に起因すると思われる親水性の高い樹脂に対する「接着性」のバランスを考慮すると、ｍ：ｎは好ましくは１：４〜４：１程度である。

In the formula, each R is independently H or a methyl group, R ₁ is an alkylene group having 1 to 5 carbon atoms, p is an integer, preferably an integer of 20 or less, and p is 2 or more. R _{1 of} an alkylene group having a different carbon number may be included. R ₂ is an alkyl group having 1 to 5 carbon atoms, and R ₂ may be substituted with a hydroxy group. R ₃ is an alkylene group having 1 to 20 carbon atoms, R ₄ is an alkyl group having 1 to 5 carbon atoms, and R ₅ is a perfluoroalkyl group having 2 to 10 carbon atoms. -X- represents a bond such as -O- or -OC (= O)-.
More preferably, each R is independently H or a methyl group, R ₁ is an alkylene group having 2 or 3 carbon atoms, R ₂ is an alkyl group having 2 or 3 carbon atoms, and R ₂ is a hydroxy group R ₃ is an alkylene group having 1 to ₃ carbon atoms, R ₄ is an alkyl group having 2 or 3 carbon atoms, and R ₅ is a perfluoroalkyl group having 4 to 8 carbon atoms. It is. M and n are integers, preferably an integer of 50 or less. The ratio of m and n is not particularly limited, but considering the balance between “releasability” that is attributed to the fluoroalkyl moiety and “adhesiveness” to a highly hydrophilic resin that is attributed to the polyoxyalkylene moiety, m: n is preferably about 1: 4 to 4: 1.

Furthermore, as a specific example of a polyoxyalkylene acrylate compound / N-perfluoroalkylsulfonylamino acrylate copolymer,
Acrylic acid polyoxyethylene methyl ether / acrylic acid N-perfluorooctylsulfonyl-N-propylaminoethyl copolymer,
Polyoxyethylenepropyl ether acrylate / N-perfluorooctylsulfonyl acrylate-N-propylaminoethyl copolymer,
Polyoxypropylene glycol monoester acrylate / N-perfluorooctylsulfonyl acrylate-N-propylaminoethyl copolymer,
Acrylic acid polyoxypropylene methyl ether / acrylic acid N-perfluorooctylsulfonyl-N-propylaminoethyl copolymer,
Polyoxypropylene ethyl ether acrylate / N-perfluorooctylsulfonyl acrylate-N-propylaminoethyl copolymer,
Polyoxyethylenepropyl ether acrylate / N-perfluorobutylsulfonyl acrylate-N-hydroxypropylaminoethyl copolymer,
Polyoxypropylene ethyl ether acrylate / N-perfluorooctylsulfonyl acrylate-N-methylaminoethyl copolymer,
Polyoxypropylene glycol monoacrylate / acrylic acid N-perfluorooctylsulfonyl-N-hydroxyethylaminoethyl copolymer,
Acrylic acid polyoxyethylene polyoxypropylene methyl ether / acrylic acid N-perfluorooctylsulfonyl-N-propylaminoethyl copolymer,
Acrylic acid polyoxyethylene polyoxypropylene propyl ether / acrylic acid N-perfluorooctylsulfonyl-N-propylaminoethyl copolymer,
Acrylic acid polyoxyethylene polyoxypropylene propyl ether / N-perfluorobutylsulfonyl acrylate-N-hydroxypropylaminoethyl copolymer and the like can be used.

  The fluorine-containing copolymer of the present invention can be produced by using a normal polymerization reaction of a corresponding polyoxyalkylene group-containing (meth) acrylate monomer and a perfluoroalkylsulfonylamino group-containing (meth) acrylate monomer. Examples thereof include addition polymerization methods such as radical polymerization, anionic polymerization, and cationic polymerization, or ring-opening polymerization methods, polycondensation methods, and polyaddition polymerization methods. The fluorine-containing copolymer of the present invention may be a random copolymer of the above two types of monomers, an alternating copolymer, or a block copolymer.

The surface tension of the fluorine-containing copolymer of the present invention is not particularly limited, but based on JIS K 2241, the surface tension is 25 dyne / cm at a concentration of 0.2% by mass using methyl ethyl ketone (MEK) as a solvent. The following is preferred. The viscosity of the fluorine-containing copolymer is generally 50,000 mPa.s. s (25 degreeC) or less is preferable.
0.1-15 mass% is preferable with respect to the total solid of a back surface coating layer, and, as for the compounding quantity of the fluorine-containing copolymer of this invention, 2-10 mass% is more preferable. If the blending amount is less than 0.1% by mass, sufficient releasability is difficult to obtain, and the back surface layer and the ribbon may be fused at the time of back printing. On the other hand, if the blending amount exceeds 15% by mass, the releasability effect and the antistatic effect are saturated, and further performance cannot be expected, the cost is increased, and it is not practical.

  In the back coating layer of the present invention, an adhesive resin effective as a binder is used. These resins are also effective for improving the adhesive strength of the back coating layer to the support. Conventionally known adhesive resins can be appropriately used as such resins. For example, acrylic resins, styrene-butadiene copolymer resins, urethane resins, polyvinyl acetal resins, polyester resins, epoxy resins, melamine resins. From water and organic solvents, such as phenolic resin, phenoxy resin, cellulose derivative resin, organic solvent soluble resin, acrylic resin, polyvinyl alcohol resin, water soluble resin such as starch, polyvinyl alcohol resin, acrylic resin These mixed solvent-soluble resins can be used, and these resins can be used alone or in appropriate combination of two or more. Moreover, the reaction hardened | cured material of these resin can also be used.

  The back surface layer of the present invention can contain various additives as required. Mold release agents such as higher fatty acid salts and silicone oils, organic fillers such as nylon resin particles, silicone resin particles, acrylic resin particles and fluororesin particles, inorganic fillers such as titanium oxide, antifoaming agents, dispersants, crosslinking agents, colored Pigments, fluorescent dyes, fluorescent pigments, ultraviolet absorbers and the like may be appropriately selected and used.

The solid content coating amount of the back coating layer is preferably in the range of 1 to 10 g / m ² , more preferably ² to 8 g / m ² . If it is less than 1 g / m < ² >, a back surface coating layer cannot completely cover the sheet-like support surface, and a coating film defect may occur or surface electrical resistance may increase. When it exceeds 10 g / m ² , the coating film strength of the back surface coating layer is insufficient or the cost is increased, which is disadvantageous economically.

  As the sheet-like support used in the present invention, known materials such as a paper sheet mainly composed of cellulose pulp and a multilayer structure film (synthetic paper) mainly composed of a thermoplastic resin are used. As a multilayer structure film containing thermoplastic resin as a main component, a stretched film containing polyethylene, polypropylene, polyethylene terephthalate, polyamide, polyvinyl chloride, polystyrene, etc. as a main component in the surface layer, or thermoplastic resin such as polyolefin as a main component. Multilayer film can be used, paper mainly composed of cellulose pulp, coated paper, art paper, cast paper, laminated paper provided with a thermoplastic resin layer on at least one surface of a paper sheet, or the like, or A synthetic resin film or sheet containing, as a main component, polyester, polyamide, polyolefin, polystyrene, polycarbonate, polyvinyl alcohol, polyvinyl chloride, or the like can be used.

  When a paper sheet is used as a sheet-like support, the back layer suitability is generally inferior because of the insufficient uniformity of the back layer compared to the film support, and the improvement effect of the present invention is great. . As for the thickness of a sheet-like support body, 100-300 micrometers is preferable. If the thickness is less than 100 μm, the mechanical strength is insufficient, and if it exceeds 300 μm, the thickness of the obtained receiving sheet becomes excessive, and the number of receiving sheets stored in the printer may be reduced.

  In the present invention, an intermediate layer can be provided on the sheet-like support, if necessary, for the purpose of improving adhesion with other layers such as a receiving layer. As the resin used for forming the intermediate layer, various hydrophilic resins and hydrophobic resins can be used. For example, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, polyacrylic acid ester, polymethacrylic acid ester, polyester resin. Urethane resin can be used. Also, known antistatic agents and crosslinking agents can be used alone or in combination with the above resins.

Solid coating amount of the intermediate layer is preferably in the range of 0.2-5 g / ^{m 2,} is less than 0.2 g / ^{m 2} may bonding effect as the intermediate layer is insufficient, the 5 g / ^{m 2} When it exceeds, the operativity may be lowered due to blocking or the like.

  When a paper sheet is used as the sheet-like support, it is preferable to provide a low-density layer containing hollow particles between the support and the receiving layer in order to improve print quality such as print density and image quality. In the present invention, the hollow particles used in the low-density layer are, for example, single production of polyvinylidene chloride, polyacrylonitrile, methyl methacrylate, etc., with low-boiling hydrocarbons such as n-butane, i-butane, pentane, neopentane, etc. as the nucleus. And a microencapsulated body resin or a copolymer resin as a shell.

  In the present invention, the average particle diameter of the hollow particles is preferably about 0.1 to 20 μm, more preferably 0.5 to 10 μm after the formation of the low density layer. For example, a method for preparing a low density layer using pre-foamed particles to form a low density layer, and a method for preparing a low density layer using unfoamed particles and applying a low density layer Thereafter, any of methods such as foaming particles to form a low-density layer may be used. In the low-density layer, when the average particle diameter of the hollow particles exceeds 20 μm, the smoothness may be lowered and the image quality may be deteriorated. If the thickness is less than 0.1 μm, sufficient heat insulation cannot be obtained, the amount of ink transferred from the ink sheet is reduced, and the image density may be lowered. Further, the volume porosity of the hollow particles is preferably 30 to 95%, more preferably 75 to 95%. When the volume porosity is less than 30%, the heat insulation is insufficient, and a sufficient concentration may not be obtained. On the other hand, if it exceeds 95%, the shell thickness of the hollow particles becomes thin, the hollow particles are liable to be crushed, and adverse effects such as a decrease in heat insulation may occur. The volume porosity of the hollow particles can be obtained from the volume specific gravity of the aqueous dispersion of the hollow particles, the solid content concentration, and the true specific gravity of the resin constituting the hollow particle shell.

  In the present invention, water-soluble polymers and water-dispersible resins similar to those in the case of the protective layer can be used as the aqueous polymer compound used for forming the low density layer. Among the water-soluble polymer compounds, polyvinyl alcohol is preferable. Among the water-dispersible resins, ethylene-vinyl acetate copolymer latex and acrylate resin latex are preferably used. Moreover, the said aqueous high molecular compound can also be used individually or in mixture of 2 or more types.

  In the present invention, the mixing ratio of the hollow particles and the aqueous polymer compound, which is a constituent material of the low density layer, is preferably 10 to 300 parts by mass of the hollow particles with respect to 100 parts by mass of the aqueous polymer compound. More preferably, it is 80-200 mass parts. Incidentally, if the amount of the hollow polymer particles is 10 parts by mass or less with respect to 100 parts by mass of the aqueous polymer compound, sufficient heat insulation cannot be obtained, and the density of the printed image and the image quality may be degraded. On the other hand, when the hollow particles are 300 parts by mass or more with respect to 100 parts by mass of the aqueous polymer compound, the strength of the coating film is lowered, and the coating film may be peeled off or the coating film may be cracked. In addition, various inorganic and organic pigments, waxes, metal soaps, etc. can be used as the material constituting the low-density layer, and further UV absorbers, fluorescent dyes, oil repellents, antifoaming agents, viscosity modifiers as necessary. Such various additives can be used as long as the desired effects are not impaired.

The coating amount as the solid content of the low-density layer is preferably 1 to 50 g / ^{m 2,} more preferably from 5 to 20 g / ^{m 2.} The thickness of the low density layer is preferably about 20 to 90 μm. When the solid content coating amount of the low density layer is less than 1 g / m ² , sufficient heat insulating properties and cushioning properties cannot be obtained, and the density may be lowered or the image quality may be deteriorated. On the other hand, if the solid content coating amount exceeds 50 g / m ² , the heat insulation and cushioning effects are saturated, which is economically disadvantageous.

  The receiving layer used in the present invention is formed mainly of a dye dyeable resin capable of dyeing a dye transferred from the ink ribbon. Examples of such dye dyeable resins include polyester resins, acrylic resins, polyvinyl chloride resins, ethylene-vinyl acetate copolymer resins, vinyl chloride-vinyl acetate copolymer resins, cellulose acetate resins, and cellulose acetate butyrate resins. One or more selected from polycarbonate resin, phenoxy resin, polyurethane resin and the like can be used.

Additives can be added to the receiving layer as necessary, for example, amino- or hydroxy-modified silicone oil, silicone resins such as acrylic silicone resin, silicone oil, and release agents such as fatty acid ester compounds, isocyanate Cross-linking agents such as phthalates and epoxy compounds, plasticizers such as phthalates, aliphatic dibasic esters, trimellitic esters, phosphate esters, epoxies, and polyesters, UV absorbers, etc. May be included. The solid coating amount of the receiving layer is preferably 1 to 12 g / m ² . If it is less than 1 g / m ² , the receiving layer cannot completely cover the surface of the sheet-like support, and the image quality may deteriorate. On the other hand, if it exceeds 12 g / m ² , the adhesive strength of the receiving layer may be reduced, or the heat insulating effect of the sheet-like support may not be sufficiently exhibited, and the image density may be reduced.

  In the present invention, a barrier layer is preferably provided between the low density layer and the receiving layer. Generally, an organic solvent such as toluene or methyl ethyl ketone is used as a solvent for the coating solution for the receiving layer. Therefore, the barrier layer can be deformed or broken due to swelling or dissolution of the hollow particles in the low density layer due to penetration of the organic solvent. It is effective as a barrier to prevent.

As the resin used for the barrier layer, a resin having excellent film forming ability, preventing permeation of an organic solvent, and having elasticity and flexibility is used. Specifically, starch, modified starch, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, gelatin, casein, gum arabic, fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, carboxy modified polyvinyl alcohol, acetoacetyl group-modified polyvinyl alcohol, diester Isobutylene-maleic anhydride copolymer salt, styrene-maleic anhydride copolymer salt, styrene-acrylic acid copolymer salt, ethylene-acrylic acid copolymer salt, urea resin, urethane resin, melamine resin, amide resin, etc. The water-soluble polymer resin is used as an aqueous solution. Water dispersible resins such as styrene-butadiene copolymer latex, acrylic ester resin latex, methacrylic ester copolymer latex, ethylene-vinyl acetate copolymer latex, polyester polyurethane ionomer, polyether polyurethane ionomer, etc. Can also be used.
Among the above resins, water-soluble polymer resins are preferably used. Moreover, said resin may be used individually or may be used in combination of 2 or more type.

  Furthermore, the barrier layer may contain various pigments, preferably a swellable inorganic layered compound is used, which is excellent not only in preventing penetration of the coating solvent but also in preventing blurring of the thermal transfer dyed image. An effect is obtained. Specific examples of the swellable inorganic layered compound include graphite, phosphate derivative compounds (such as zirconium phosphate compounds), chalcogenides, hydrotalcite compounds, lithium aluminum composite hydroxides, clay minerals (for example, Synthetic mica, synthetic smectite, smectite group, vermiculite group, mica group, etc.). In addition to natural products (clay minerals), these swellable inorganic layered compounds may be synthetic products or processed products (for example, surface-treated products of silane coupling agents).

The coating amount of the solid content of the barrier layer is preferably in the range of 0.5 to 8 g / m ² , more preferably 1 to 7 g / m ² , and particularly preferably 1 to 6 g / m ² . Incidentally, when the barrier layer solid content coating amount is less than 0.5 g / m ² , the barrier layer may not completely cover the surface of the intermediate layer, and the organic solvent permeation preventing effect may be insufficient. On the other hand, when the coating amount of the barrier layer solid content exceeds 8 g / m ² , the coating effect is saturated and uneconomical. May not be sufficiently exhibited, and the image density may be lowered.

  The receiving layer, back coating layer, and other coating layers of the receiving sheet of the present invention include a bar coater, a gravure coater, a blade coater, an air knife coater, a gate roll coater, a curtain coater, a die coater, a lip coater, and a slide bead coater. The coating liquid (coating liquid) for forming each layer can be applied using a coater such as, and dried.

  The thermal transfer receiving layer of the present invention will be described in more detail with reference to the following examples, but the present invention is of course not limited thereto. In the examples, “parts” and “%” mean “parts by mass” and “% by mass” of solids, except for solvents, unless otherwise specified.

Example 1
A biaxially stretched multilayer film of 60 μm thickness (trade name: YUPO FPG60, manufactured by YUPO Corporation) containing an inorganic pigment as a main component on both front and back surfaces of a polyethylene terephthalate (PET) film having a thickness of 50 μm. The sheet-like support was obtained by pasting together by a dry laminating method using a polyester adhesive.
On one surface of the support, the receiving layer coating solution-1 having the following composition was coated and dried so that the solid content coating amount was 5 g / m ² to form a receiving layer.

"Coating liquid for receiving layer-1"
Polyester resin (trade name: Byron 200, manufactured by Toyobo Co., Ltd.) 100 parts silicone oil (trade name: KF393, manufactured by Shin-Etsu Chemical Co., Ltd.) 5 parts polyisocyanate (trade name: D140N, manufactured by Mitsui Takeda Chemical Co., Ltd.)
Isophorone diisocyanate compound) 5 parts Toluene / methyl ethyl ketone (MEK) = 1/1 300 parts Next, the following back surface layer coating liquid-1 is applied to the opposite surface of the sheet-like support provided with the receiving layer by solid content coating. The receiving sheet was prepared by coating and drying so that the amount was 3 g / m ² to form a back coating layer.

"Coating liquid for back layer-1"
Release agent (A): Polyoxyethylene methyl ether acrylate / N-perfluorooctylsulfonyl acrylate-N-propylaminoethyl copolymer (solid content 50%, surface when 0.2% by mass added to MEK) Tensile force 23.5 dyne / cm) 8 parts polyacrylic ester resin (trade name: Jurimer AT613, manufactured by Nippon Pure Chemical Co., Ltd.) 60 parts nylon resin particles (trade name: MW330, nylon 12 resin, average particle size 7 μm,
13 parts epoxy crosslinking agent (trade name: SAR615B, manufactured by Chuo Rika Kogyo Co., Ltd.) 5 parts polyvinyl acetal resin (trade name: ESREC KX-1, manufactured by Sekisui Chemical Co., Ltd.) 14 parts water / isopropyl alcohol (IPA) ) = 80/20 200 parts

Example 2
As a sheet-like support, art paper (trade name: OK Kanto, manufactured by Oji Paper Co., Ltd.) having a thickness of 150 μm is used, and the coating film for low density layer-1 having the following composition is applied to one side of the art paper. Was coated and dried so as to be 43 μm to form a low density layer.
"Coating fluid for low density layer-1"
Acrylic ester foam particles (volume porosity 79%, average particle size 3.6 μm,
Maximum particle size 19 μm) 35 parts polyvinyl alcohol (trade name: PVA205, manufactured by Kuraray Co., Ltd.) 15 parts styrene-butadiene latex (trade name: PT1004, manufactured by Asahi Kasei) 50 parts water 200 parts

On the low density layer, a barrier layer coating liquid-1 having the following composition is applied and dried so that the solid content coating amount is 2 g / m ² , thereby forming a barrier layer, and further on the barrier layer. The receiving layer coating solution-1 (Example 1) was coated and dried so that the solid coating amount was 5 g / m ² to form a receiving layer.
"Coating fluid for barrier layer-1"
Polyvinyl alcohol (trade name: PVA420, manufactured by Kuraray Co., Ltd.) 10 parts Water 100 parts Next, on the surface of the sheet-like support opposite to the side on which the low density layer, barrier layer, and receiving layer are provided, the coating for the back surface having the following composition The coating liquid-2 was applied and dried so that the solid content coating amount was 3 g / m ^2, and a back coating layer was formed to prepare a receiving sheet.

"Back layer coating liquid-2"
Release agent (B): Polyoxyethylenepropyl ether acrylate / N-perfluorobutylsulfonyl acrylate-N-hydroxypropylaminoethyl copolymer (solid content 95%, 0.2% by mass added to MEK) Surface tension 21.2 dyne / cm) 10 parts acrylic ester resin (trade name: FC80, manufactured by Nippon Pure Chemical Co., Ltd.) 55 parts acrylic beads (trade name: MMA1013, manufactured by Nippon Shokubai Co., Ltd.) 15 parts epoxy resin (trade name: SAR615B) 5 parts polystyrene sulfonate soda (trade name: Chemistat CS6120, manufactured by Nippon Pure Chemical Co., Ltd.)
Sanyo Chemical Co., Ltd.) 15 parts water / IPA = 80/20 150 parts

Example 3
Using art paper (trade name: OK Kanfuji, manufactured by Oji Paper Co., Ltd.) having a thickness of 150 μm as the sheet-like support, coating liquid 2 for the low density layer having the following composition on one side, and the film thickness after drying Coating and drying were carried out so as to be 50 μm to form a low density layer.
"Coating liquid for low density layer-2"
Acrylic ester foamed particles (volume porosity 88%, average particle size 4.4 μm,
Maximum particle size 20 μm) 35 parts polyvinyl alcohol (trade name: PVA205, manufactured by Kuraray Co., Ltd.) 15 parts styrene-butadiene latex (trade name: PT1004, manufactured by Asahi Kasei Co., Ltd.) 50 parts water 200 parts Coating for barrier layer on the low density layer The coating liquid-1 (Example 2) was coated and dried so that the solid content coating amount was 2 g / m ² to form a barrier layer. Further, the receiving layer coating liquid-1 was formed on the barrier layer. (Example 1) was coated and dried so that the solid content coating amount was 5 g / m ² to form a receptor layer.

Next, on the surface of the sheet-like support opposite to the side on which the low density layer, the barrier layer, and the receiving layer are provided, the back layer coating solution-3 having the following composition has a solid content coating amount of 3 g / m ^2. As described above, coating and drying were carried out to form a back coating layer to prepare a receiving sheet.
"Back layer coating liquid-3"
Mold release agent (C): Polyoxypropylene glycol monoester acrylate / N-perfluorooctylsulfonyl acrylate-N-propylaminoethyl copolymer (solid content 50%, 0.2% by mass added to MEK) Surface tension 20.6 dyne / cm) 5 parts acrylic ester resin (trade name: Bonlon B1000, manufactured by Mitsui Chemicals) 70 parts silicone filler (trade name: Tospearl 145, average particle size 4.5 μm,
10 parts acrylic ester resin (trade name: Polymeron 482, Arakawa Chemical Co., Ltd.) 20 parts Water / IPA = 80/20 150 parts

Comparative Example 1
A receiving sheet was prepared in the same manner as in Example 1. However, the back layer coating liquid-4 having the following composition was used for forming the back layer.
"Coating liquid for back layer-4"
Release agent (D): Perfluoroalkyl acrylate-containing block polymer (trade name: Modiper F200, manufactured by NOF Corporation) 10 parts Polyacrylic ester resin (trade name: Jurimer AT613, manufactured by Nippon Pure Chemicals Co., Ltd.) 60 parts nylon resin Particles (trade name: MW330, nylon 12 resin,
Average particle size 7 μm, manufactured by Shinto Fine Co., Ltd. 13 parts epoxy cross-linking agent (trade name: SAR615B, manufactured by Chuo Rika Kogyo Co., Ltd.) 5 parts polyvinyl acetal resin (trade name: ESREC KX-1, manufactured by Sekisui Chemical Co., Ltd.) 12 parts water / IPA = 80/20 200 parts

Comparative Example 2
A receiving sheet was prepared in the same manner as in Example 1. However, the back layer coating solution-5 having the following composition was used for forming the back layer.
"Coating solution for back layer-5"
Release agent (E): Perfluoroalkylethylene oxide adduct (trade name: Unidyne DS501, manufactured by Daikin Industries, Ltd., surface tension of 25.5 dyne / cm when 0.2% by mass added to MEK) 10 parts acrylic ester resin (Product name: FC80, manufactured by Nippon Pure Chemical Co., Ltd.) 55 parts acrylic beads (Product name: MMA1013, manufactured by Nippon Shokubai Co., Ltd.) 15 parts Epoxy resin (Product name: SAR615B, manufactured by Nippon Pure Chemicals Co., Ltd.) 5 parts Polystyrene sulfonate soda ( Product name: Chemistat CS6120
Sanyo Chemical Co., Ltd.) 15 parts water / IPA = 80/20 150 parts

Comparative Example 3
A receiving sheet was prepared in the same manner as in Example 2. However, the back surface layer coating liquid-5 (Comparative Example 2) was used for the back surface layer formation.

Comparative Example 4
A receiving sheet was prepared in the same manner as in Example 3. However, the back layer coating liquid-6 having the following composition was used for forming the back layer.
"Coating liquid for back layer-6"
Release agent (F): Fluorine-containing alcohol (trade name: Unisafe HFA5635,
10 parts acrylic ester resin (trade name: Bonlon B1000, manufactured by Mitsui Chemicals) 70 parts silicone filler (trade name: Tospearl 145, average particle size 4.5μ,
10 parts acrylic ester resin (trade name: Polymeron 482, Arakawa Chemical Co., Ltd.) 20 parts Water / IPA = 80/20 150 parts

Evaluation The following items were evaluated for the quality of the receiving sheets obtained in the above Examples and Comparative Examples. The evaluation results are shown in Table 1.

[Surface electrical resistance on the back layer coating side]
The surface electrical resistance on the back coating layer side of the receiving sheet was measured and evaluated using an IP resistance meter HI-RESTA (manufactured by Mitsubishi Chemical Corporation) in an environment of 23 ° C. and 50% RH.

[Running in printer]
Twenty-five receiving sheets were set on a sublimation thermal transfer video printer (trade name: NV-AP1, manufactured by Matsushita Electric Industrial Co., Ltd.), and a solid black image was continuously printed in an environment of 10 ° C. and 30% RH. Four sets of this were carried out for a total of 100 sheets, and the printer running performance of the receiving sheet was evaluated according to the following criteria.
A: No paper feeding / discharging trouble is observed.
○: Only when the head temperature of the printer rises, the receiving sheet and the ink ribbon are slightly fused, but the paper discharge is at a practical level without any problem.
X: The receiving sheet and the ink ribbon are frequently fused, ribbon trouble occurs, and there is a problem in practical use.

[Back print suitability]
Set 10 receiving sheets on a sublimation thermal transfer video printer (trade name: NV-AP1, manufactured by Matsushita Electric Industrial Co., Ltd.), and reverse them upside down, and print a solid black image in a 23 ° C, 50% RH environment. The back print suitability of the receiving sheet was evaluated according to the following criteria.
A: There is no fusion between the back coating layer and the ink ribbon, and the paper is discharged normally.
○: The back coating layer and the ink ribbon are slightly fused, but the paper is discharged without any problem and is at a practical level.
X: The back surface coating layer and the ink ribbon are fused, troubles of jamming and ribbon breakage occur inside the printer, and there are practical problems.

表１の結果から、実施例１〜３の受容シートは、裏面の表面電気抵抗が小さく、裏プリント適性も良好で、走行性が優れていることが確認された。

From the results in Table 1, it was confirmed that the receiving sheets of Examples 1 to 3 had low surface electrical resistance on the back surface, good back print suitability, and excellent running properties.

The thermal transfer receiving sheet of the present invention has a low surface electrical resistance of the back surface coating layer and excellent releasability, so there is no double feeding or paper jam due to static electricity, and the back surface coating layer and ink ribbon during back printing It is a receptive sheet that has extremely good running performance and does not have any fusion, and contributes greatly to the industry.

Claims (2)

  Thermal transfer receiving sheet comprising a sheet-like support, a receiving layer formed on the surface of the support and containing a dyeable resin as a main component, and a back coating layer formed on the back of the support A thermal transfer receiving sheet, wherein the back coating layer contains a polyoxyalkylene compound of acrylic acid / N-perfluoroalkylsulfonylamino compound of acrylic acid copolymer. The thermal transfer receiving sheet according to claim 1, wherein the sheet-like support has cellulose pulp as a main component and a low-density layer containing hollow particles between the sheet-like support and the receiving layer.