JP3827801B2 - Thermal transfer image receiving sheet - Google Patents

Description

【００３５】
一方、下記組成の染料層用インキを調整し、背面に耐熱処理を施した６μｍ厚のポリエチレンテレフタレートに、乾燥塗工量が１．０ｇ／ｍ² になるようにワイヤーバーにより塗布、乾燥し、さらに背面にシリコーンオイル（Ｘ−４１・４００３Ａ、信越シリコーン）をスポットで数滴滴下後、全面に広げて背面処理コートを行い、熱転写シートを得た。
染料層形成用塗工液
分散染料（カヤセットブルー７１４：日本化薬（株）） ４．０部
エチルヒドロキシセルロース（ハーキュレス社） ５．０部
メチルエチルケトン／トルエン（重量比１／１） ８０．０部
ジオキサン １０．０部
【００３６】
前記の実施例および比較例の熱転写受像シートの受容層の面に上記熱転写シートの染料層面が接触するように重ね、熱転写シートの背面からサーマルヘッドにて加熱をおこなった。
加熱条件は、出力０．２Ｗ／ドット、パルス幅１２ｍｓｅｃ．ドット幅６ドット／ｍｍで、シアン画像の印字を行ったところ、いずれも画像に抜けや色むらがなく、良好であった。
【００３７】
【発明の効果】
したがって、本発明の熱転写受像シートは、基材シートの少なくとも一方の面に、中間層と受容層とをこの順序で積層してなる熱転写受像シートにおいて、該中間層が色材として、白色顔料と、ジス−アゾ系、酸化チタン系、酸化鉄系の中の少なくとも一つの黄色顔料と、カーボンブラックを含有し、かつ該受容層が設けられた表面の反射特性が、ＪＩＳ−Ｚ８７２２に規定された方法で測定し、ＪＩＳ−Ｚ８７３０によって規定された方法で表示した場合のＬ、ａ及びｂの値が、Ｌ＝８７〜９４、ａ＝−２．５〜２、ｂ＝３．５〜７．５の範囲にあることにより、受容層における染料の転写性が低下したり、転写ムラ等が発生することがなく、均一に着色化することが簡単にでき、引張強度や引裂強度が低下することもなく、解像度と、印画部のみならず非印画部の色相を、見本品に厳密に合わせることが可能となる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thermal transfer image-receiving sheet that is used while being superposed on a thermal transfer sheet. More specifically, the present invention can form a high-density and high-resolution image, adjust the hue of the image-receiving sheet surface, and stably maintain the hue. The present invention relates to an image receiving sheet.
[0002]
[Prior art]
Conventionally, various thermal transfer recording methods are known. Among them, sublimation dyes can be dyed with sublimation dyes from a thermal transfer sheet using a sublimation transfer dye as a recording agent and supported on a substrate sheet such as a polyester film. There have been proposed methods for forming various full-color images by thermally transferring a sublimation transfer dye onto a thermal transfer image-receiving sheet having a dye-receiving layer formed on a material to be transferred, such as paper or plastic film.
In this case, a thermal head of the printer is used as the heating means, and the color dots in which a large number of heating amounts of three colors or four colors are adjusted by heating for a very short time are transferred to the receiving layer of the thermal transfer image receiving sheet, The full color of the original is reproduced by the multicolored dots.
Since the image formed in this manner is a dye used as a coloring material, it is very clear and excellent in transparency. It is possible to form a high-quality image similar to an image obtained by offset printing or gravure printing and comparable to a full-color photographic image.
[0003]
Utilizing high-quality images by sublimation transfer recording has started to be used as proofreading materials for various printing such as gravure printing, offset printing, and screen printing. In order to match the hue of images and the like with a main printed product, a conventional printed material for proofreading has been printed with proofing ink in the same manner as the main printing and the printing conditions, and dried and laboriously produced.
However, according to the above sublimation transfer recording method, there is no need for a printing plate or proofing ink, and if there is an original image of the image to be printed, the image is converted into an electrical signal, and the thermal transfer sheet and the thermal transfer image receiving sheet are converted. In combination, printing with a thermal transfer printer makes it easy to obtain a printed material for calibration.
Further, not only the above-described printed matter for calibration, but also a printed matter of sublimation transfer recording is used as an alternative to the main printing product such as gravure printing and offset printing.
[0004]
[Problems to be solved by the invention]
The printed matter obtained by the sublimation transfer recording method as described above is required to strictly match the resolution and the hue of the non-printed portion as well as the printed portion with the sample product. In other words, a printed matter of sublimation transfer recording that can be regarded as the same as the sample product in the finished state is required, and the hue of the image receiving surface of the thermal transfer image receiving sheet, which is a non-printing part, is changed to the hue (ground color) of the surface of the sample product. It is required to strictly adapt.
On the other hand, it is possible to add a white pigment or an organic or inorganic coloring material to the receiving layer of the thermal transfer image-receiving sheet to match the background color of the sample, but the dye in the receiving layer can be mixed with these additives. There is a problem that the transferability of the toner is deteriorated or uneven transfer occurs.
[0005]
In addition, it is possible to add a white pigment or an organic or inorganic coloring material to the base sheet of the thermal transfer image-receiving sheet, and it is difficult to uniformly color the entire wide width of the base sheet. There is a problem that the tensile strength and tear strength of the sheet are lowered.
Japanese Patent Laid-Open No. 1-206095 filed by the present applicant discloses that a receiving layer or an intermediate layer of a thermal transfer image receiving sheet contains a white pigment, a blue dye and a red dye to obtain an image receiving sheet having excellent whiteness. Has been. However, this method has a problem that it cannot be precisely matched to the ground color of the sample product having a slightly grayish taste. Therefore, the present invention solves the above-mentioned problems of the prior art, does not reduce the transferability of the dye in the receiving layer, does not cause uneven transfer, etc., and can be easily colored uniformly. It is an object of the present invention to provide a thermal transfer image-receiving sheet capable of precisely matching the resolution and the hue of the non-printed portion as well as the printed portion without reducing the strength and tear strength.
[0006]
[Means for Solving the Problems]
  That is, the thermal transfer image-receiving sheet of the present invention is a thermal transfer image-receiving sheet obtained by laminating an intermediate layer and a receiving layer in this order on at least one surface of a base sheet.As a coloring material, a white pigment, at least one yellow pigment of dis-azo, titanium oxide and iron oxide, and carbon blackL, a, and b when the reflection characteristics of the surface containing the light receiving layer are measured by the method defined in JIS-Z8722 and displayed by the method defined by JIS-Z8730 Is in the range of L = 87 to 94, a = −2.5 to 2, and b = 3.5 to 7.5.
[0007]
[Action]
  In the thermal transfer image receiving sheet of the present invention, an intermediate layer and a receiving layer are laminated in this order on a substrate sheet, and the intermediate layer is formed on the intermediate layer.As a coloring material, a white pigment, at least one yellow pigment of dis-azo, titanium oxide and iron oxide, and carbon blackWhen the reflective property of the surface provided with the receiving layer is measured by the method specified in JIS-Z8722 and displayed by the method specified by JIS-Z8730, L, a and b The values are in the range of L = 87 to 94, a = −2.5 to 2, and b = 3.5 to 7.5. By doing so, the thermal transfer image-receiving sheet of the present invention can be easily colored uniformly without lowering the transferability of the dye in the receiving layer or causing uneven transfer, and has a tensile strength. In addition, the resolution and the hue of the non-printed portion as well as the printed portion can be precisely matched to the sample without lowering the tear strength. However, the hue of the non-printing portion has a slightly gray color, and is, for example, the ground color of printed paper used in overseas magazines and catalogs.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the invention will be described in detail below using the thermal transfer image receiving sheet of the present invention. The thermal transfer image receiving sheet of the present invention is a thermal transfer image receiving sheet obtained by laminating an intermediate layer and a receiving layer in this order on at least one surface of a substrate sheet.As a coloring material, a white pigment, at least one yellow pigment of dis-azo, titanium oxide and iron oxide, and carbon blackL, a, and b when the reflection characteristics of the surface containing the light receiving layer are measured by the method defined in JIS-Z8722 and displayed by the method defined by JIS-Z8730 Is in the range of L = 87 to 94, a = −2.5 to 2, and b = 3.5 to 7.5.
[0009]
(Base material sheet)
The base sheet has a role of holding the receiving layer and heat is applied during thermal transfer. Therefore, the base sheet preferably has a mechanical strength that does not hinder handling even in a heated state.
The material of such a base sheet is not particularly limited. For example, condenser paper, glassine paper, sulfuric acid paper, high-size paper, synthetic paper (polyolefin-based, polystyrene-based), high-quality paper, art paper, coated paper , Cast coated paper, wallpaper, backing paper, synthetic resin or emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin internal paper, paperboard, cellulose fiber paper, or polyester, polyacrylate, polycarbonate, polyurethane, polyimide, polyether Imide, cellulose derivative, polyethylene, ethylene-vinyl acetate copolymer, polypropylene, polystyrene, acrylic, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl butyral, nylon, polyether ether ketone, polysulfone, Examples include films of polyethersulfone, tetrafluoroethylene / perfluoroalkyl vinyl ether, polyvinyl fluoride, tetrafluoroethylene / ethylene, tetrafluoroethylene / hexafluoropropylene, polychlorotrifluoroethylene, and polyvinylidene fluoride. A white opaque film formed by adding a white pigment or a filler to these synthetic resins or a foamed foam sheet can be used, and is not particularly limited.
[0010]
Moreover, the laminated body by the arbitrary combinations of the said base material sheet can also be used. As an example of a typical laminated body, the synthetic paper of a cellulose fiber paper and a synthetic paper or a cellulose fiber paper and a plastic film is mentioned.
The thickness of these substrate sheets may be arbitrary, and is usually about 10 to 300 μm. Moreover, when the adhesiveness of the said base material sheet and the layer provided on it is scarce, it is preferable to perform various primer processing and corona discharge processing on the surface of a base material sheet.
[0011]
(Middle layer)
The intermediate layer formed on the base sheet is mainly for the purpose of coloring the image receiving surface and concealing the base sheet, and includes two or more kinds of color materials, a white pigment, and other types as necessary. It is the structure which consists of resin which is an additive and a binder.
Examples of suitable resins for forming the intermediate layer include thermoplastic resins such as polyurethane resins, acrylic resins, polyester resins, and polycarbonate resins, or partially crosslinked resins, crosslinkable polyurethane resins, epoxy resins, and melamine resins. And thermosetting resins such as urea resins.
[0012]
Examples of the two or more color materials include a yellow color material and a black color material, a red color material and a black color material, and a combination of a yellow color material, a red color material, and a blue color material.
Examples of the yellow color material include dis-azo pigments, titanium oxide pigments, and iron oxide pigments. I. Pigment Yellow 83 is preferably used. Examples of the black color material include carbon black.
Moreover, a conventionally well-known pigment can be used about a red color material and a blue color material.
Such a coloring material is preferably added in an amount of 0.01 to 10 parts by weight per 100 parts by weight of the resin forming the intermediate layer. It is particularly preferable to add 0.05 to 0.10 parts by weight per 100 parts by weight of the intermediate layer resin.
As the white pigment, inorganic pigments such as titanium oxide, zinc oxide, barium sulfate, and alumina white, and extender pigments such as kaolin clay, silica, magnesium carbonate, and calcium carbonate can be used alone or in combination. In the present invention, in order to give the hue of the image receiving surface a little gray, a white pigment having a slightly blue color is preferably used.
The white pigment is preferably added in an amount of 100 to 300 parts by weight per 100 parts by weight of the resin forming the intermediate layer. In particular, it is preferable to add 250 to 320 parts by weight per 100 parts by weight of the intermediate layer resin.
[0013]
The intermediate layer contains two or more kinds of color materials, and the surface reflection characteristics of the image receiving surface are measured by the method defined in JIS-Z8722, and L is displayed by the method defined by JIS-Z8730. The values of a and b are in the ranges of L = 87 to 94, a = −2.5 to 2, and b = 3.5 to 7.5.
In order to make the hue of not only the printing part but also the non-printing part strictly match with the sample, especially in order to make the hue of the non-printing part having a slightly grayish taste, the values of L, a, and b above are L = 91 to 93, a = -0.9 to -0.4, and b = 4 to 5.5 are preferable because the hue is closer to the sample.
Here, according to the method prescribed | regulated to JIS-Z8722 and JIS-Z8730, the color tone of a measuring object is represented by three values of L, a, and b. L represents lightness, and the larger the value, the higher the lightness. Further, a represents redness, and the larger the value, the stronger the redness, and the minus (-) indicates that the redness is insufficient, in other words, the greenness is strong. Furthermore, the b value is an index of yellowishness. When this value is large, it indicates that the yellowishness is strong, and when it is − (minus), it indicates that the yellowishness is insufficient and becomes blue. And when both a and b are 0, it means colorlessness.
[0014]
As the method for forming the intermediate layer, a resin, two or more kinds of colorants and a white pigment as described above, and other additives as necessary, an appropriate organic material such as acetone, ethyl acetate, methyl ethyl ketone, toluene, xylene, and cyclohexanone are used. A coating solution is prepared by dissolving and dispersing in a solvent, and this is applied to at least one surface of the substrate sheet by a forming means such as a gravure printing method, a screen printing method, or a reverse roll coating method using a gravure plate. And it is dried, and it is further crosslinked and cured as necessary to form an intermediate layer. The thickness of the intermediate layer thus formed is about 0.5 to 10 g / m in terms of solid content coating amount.²Degree, more preferably 1-6 g / m²Is preferred. If the thickness of the intermediate layer is too thin, the performance required for the intermediate layer cannot be obtained. On the other hand, if the thickness is too thick, the effect as the intermediate layer is not improved further, and the printing sensitivity is lowered.
[0015]
(Receptive layer)
The receiving layer provided on the substrate is for receiving the dye transferred from the thermal transfer sheet when heated and maintaining the formed image.
Examples of the resin for forming the receiving layer include polyolefin resins such as polypropylene, halogenated polymers such as polyvinyl chloride and polyvinylidene chloride, polyvinyl acetate, ethylene vinyl acetate copolymer, and vinyl chloride vinyl acetate copolymer. Polymers, vinyl resins such as polyacrylic esters, acetal resins such as polyvinyl formal, polyvinyl butyral, polyvinyl acetal, various saturated and unsaturated polyester resins, polycarbonate resins, cellulose resins such as cellulose acetate, polystyrene, acrylic styrene Examples thereof include styrene resins such as copolymers, acrylonitrile-styrene copolymers, polyamide resins such as urea resins, melamine resins, and benzoguanamine resins. These resins can be arbitrarily blended and used within a compatible range.
[0016]
In addition, when the binder resin of the intermediate layer has active hydrogen such as a hydroxyl group or a carboxyl group, the adhesion between the intermediate layer and the receiving layer can be improved by adding a curing agent that reacts with active hydrogen into the receiving layer. Can be improved.
As such a curing agent, conventionally known isocyanate compounds, amino compounds, and organometallic compounds are preferable. In order to increase the reaction rate of these curing agents, it is possible to use a catalyst suitable for each.
The addition amount of the curing agent varies depending on the type, but the minimum amount that can be in close contact with the intermediate layer is preferable.
[0017]
In addition, since the receiving layer resin as described above may cause fusion with the dye binder resin that retains the dye during thermal transfer during image formation, in order to obtain good releasability, a phosphate ester, a surfactant, Various release agents such as fluorine compounds, fluorine resins, silicone compounds, silicone oils, and silicone resins are preferably internally added to the receiving layer, and those obtained by adding modified silicone oil and curing are particularly preferable.
The amount of release agent added varies depending on the type of the release agent, but the release agent performance is fully exhibited when the layer solid content of the release agent is in the range of about 1 to 20 parts by weight with respect to 100 parts by weight of resin solids. The minimum amount to be given is preferred.
In the case of adding a modified silicone oil having a reactive group capable of reacting with the curing agent in the modified silicone oil, the equivalent of the reactive group of the modified silicone oil and the curing agent is in the range of 1: 1 to 1:10. It is preferable to be inside.
Further, a layer made of the above releasing agent or a layer in which the above releasing agent is mixed in a binder resin may be laminated on the receiving layer as a releasing layer without being internally added to the receiving layer.
[0018]
The above-mentioned receiving layer is obtained by dissolving a resin to which the necessary additives are added or dissolving in a suitable organic solvent. For example, a gravure printing method, a screen printing method, a reverse roll using a gravure plate It is formed by applying and drying by a forming means such as a coating method.
The receiving layer formed as described above may have any thickness, but generally has a thickness of 1 to 50 μm when dried.
[0019]
(Slip layer)
Further, a slip layer can be provided on the back surface of the thermal transfer image-receiving sheet in order to improve the sheet mechanical transportability and prevent curling.
In order to improve transportability, it is preferable to add an appropriate amount of an organic or inorganic filler to the binder resin, or to use a resin with high lubricity such as a polyolefin resin or a cellulose resin.
This slip layer is an acrylic filler as an additive in resins such as acrylic resins, cellulose resins, polycarbonate resins, polyvinyl acetal resins, polyvinyl alcohol resins, polyamide resins, polystyrene resins, polyester resins, halogenated polymers, etc. Nylon filler, Teflon filler, organic filler such as polyethylene wax, and inorganic filler such as silicon dioxide and metal oxide can be used. Of these, acrylic resins are preferred, and acrylic polyols are most preferred. Moreover, it is preferable to use what hardened | cured the acrylic polyol with the hardening | curing agent.
[0020]
The slip layer can be arbitrarily added with the resins and fillers listed above, and kneaded thoroughly with a solvent, diluent, etc. to produce a coating solution, and an intermediate layer is formed on the other surface of the base sheet. Similarly to the means, for example, it is obtained by applying and drying by a forming means such as a gravure printing method, a screen printing method, a reverse roll coating method using a gravure plate.
The receiving layer formed as described above may have any thickness, but generally has a thickness of 1 to 10 μm when dried.
[0021]
(Easily adhesive layer)
You may provide the easily bonding layer which consists of adhesive resins, such as an acrylic ester resin, a polyurethane resin, and a polyester resin, on the surface and / or back surface of a base material sheet.
The easy-adhesion layer is made of the above-described resin, and a coating liquid is produced. For example, a gravure printing method, a screen printing method, a reverse roll coating method using a gravure plate, etc. It is obtained by applying and drying by the forming means.
Moreover, without providing the coating layer described above, the surface and / or the back surface of the base sheet can be subjected to corona discharge treatment to enhance the adhesion between the base sheet and the layer provided thereon.
[0022]
(Antistatic layer)
An antistatic layer may be provided on at least one of the outermost surfaces of the thermal transfer image receiving sheet.
Examples of the antistatic layer include a method in which a fatty acid ester, a sulfate ester, a phosphate ester, an amide, a quaternary ammonium salt, a betaine, an amino acid, an ethylene oxide adduct, or the like is dissolved or dispersed in a solvent. . Furthermore, a group having an antistatic effect such as quaternary ammonium salt, phosphoric acid, ethosulphate, vinylpyrrolidone or sulfonic acid is introduced or copolymerized into a resin such as acrylic resin, vinyl resin or cellulose resin. The conductive resin may be applied.
The coating amount of the antistatic layer is 0.001 to 0.1 g / m.²It is preferable that Moreover, you may use various processes other than coating, for example, methods, such as a spray process and a transfer.
By providing the above-described antistatic layer, the obtained thermal transfer image-receiving sheet has excellent antistatic performance before printing, and it is possible to prevent paper feeding defects such as inserting two sheets.
[0023]
The thermal transfer sheet used when performing the thermal transfer using the thermal transfer image receiving sheet as described above is a thermal melting supported by a binder that thermally melts pigments in addition to the sublimation thermal transfer sheet used in the sublimation transfer recording method. A heat-melting type thermal transfer sheet may be used in which an ink layer is formed and coated on a base sheet, and the whole ink layer is transferred to a transfer object by heating.
As the means for applying thermal energy during thermal transfer, any conventionally known means for applying heat can be used. For example, the recording time is controlled by a recording device such as a thermal printer (for example, a video printer VY-100 manufactured by Hitachi, Ltd.). 5-100 mJ / mm² By applying a certain degree of thermal energy, the intended purpose can be sufficiently achieved.
[0024]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. Note that “part” or “%” is based on weight unless otherwise specified.
(Example 1)
As a base material sheet, Shin-Oji Paper Co., Ltd. OK coating 157 g / m on the support²Is used, and a foamed polypropylene film (P4256, 60 μm manufactured by Toyobo Co., Ltd., which has been subjected to plasma surface treatment) is bonded to the top and bottom of the support. On one surface of the base sheet, an intermediate layer and a receiving layer having the following composition are laminated in this order. However, the intermediate layer is 3 g / m in a dry state.²The receiving layer is 4 g / m in a dry state.²The amount of coating.
[0025]
Intermediate layer coating solution 1
14 parts of chlorinated polypropylene resin
(Hard Ren B-13: Toyo Kasei Co., Ltd.)
42 parts of titanium oxide
(TCR-30 rutile type: Tochem Products)
C. I. Pigment Yellow 83 0.01 part
0.01 parts of carbon black
38 parts of toluene
6 parts of methyl ethyl ketone
[0026]
Receiving layer coating solution
7.2 parts of vinyl chloride-vinyl acetate copolymer resin
(Denka Vinyl # 1000A: Electrochemical Industry Co., Ltd.)
1.6 parts vinyl chloride-styrene-acrylic copolymer resin
(Denkarak # 400A: Electrochemical Industry Co., Ltd.)
Polyester resin (Byron 600: Toyobo Co., Ltd.) 11.2 parts
Vinyl modified silicone 2.0 parts
(X-62-1212: Shin-Etsu Chemical Co., Ltd.)
Catalyst (CAT-PLR-5: Shin-Etsu Chemical Co., Ltd.) 1.0 part
Catalyst (CAT-PL-50T: Shin-Etsu Chemical Co., Ltd.) 1.5 parts
39 parts of toluene
Methyl ethyl ketone 39 parts
[0027]
Next, an easy-adhesion layer and a slip layer having the following composition are laminated in this order on the other surface of the base sheet. However, the easy adhesion layer is 0.1 g / m in a dry state.²The slip layer is 4 g / m in a dry state.²The amount of coating.
Easy-adhesion layer coating solution
10 parts of polyurethane resin (N-5199: Nippon Polyurethane Industry Co., Ltd.)
2 parts of polyisocyanate
(Coronate L-75: Nippon Polyurethane Industry Co., Ltd.)
45 parts of toluene
43 parts of methyl ethyl ketone
[0028]
Slip layer coating liquid
Acrylic polyol resin 20 parts
(Acridic 47-538: Dainippon Ink & Chemicals, Inc.)
Isocyanate curing agent (Takenate A-14: Takeda Pharmaceutical Company Limited) 2 parts
Nylon fine particles (Orgasol 2002: Nippon Rilsan) 0.1 parts
Catalyst (S-CAT24: Three share machine synthesis) 0.1 part
40 parts of toluene
40 parts of methyl ethyl ketone
[0029]
Furthermore, on the outermost surface of the front and back of the thermal transfer image-receiving sheet having the above-described structure of receiving layer / intermediate layer / base sheet / adhesive layer / slip layer, the antistatic layer having the following composition on the front and back surfaces is in a dry state. 1.5g / m²The thermal transfer image receiving sheet of Example 1 was prepared.
Coating solution for antistatic layer
Antistatic agent (TB-34: Matsumoto Yushi Seiyaku) 1 part
1000 parts isopropanol
[0030]
(Example 2)
The thermal transfer image-receiving sheet of Example 2 was obtained in the same manner as in Example 1 except that the intermediate layer coating liquid 1 of Example 1 was changed to the coating liquid 2 having the following composition.
Intermediate layer coating solution 2
50 parts of acrylic resin
(Nicazole FX337C: Nippon Carbide Industry Co., Ltd.)
Rutile type titanium oxide 50 parts
(Color paste white concrete RN: Tope Corp.)
Iron oxide (color paste oxide yellow N: Toupe Co., Ltd.) 0.40 parts
Carbon black 0.20 parts
(Color paste Super Black NN: Toupe Co., Ltd.)
70 parts of water
[0031]
(Comparative Example 1)
A thermal transfer image-receiving sheet of Comparative Example 1 was obtained in the same manner as in Example 1 except that the intermediate layer coating liquid 1 of Example 1 was changed to the coating liquid 3 having the following composition.
Intermediate layer coating solution 3
14 parts of chlorinated polypropylene resin
(Hard Ren B-13: Toyo Kasei Co., Ltd.)
42 parts of titanium oxide
(TCR-30 rutile type: Tochem Products)
C. I. Pigment Yellow 83 0.01 part
38 parts of toluene
6 parts of methyl ethyl ketone
[0032]
(Comparative Example 2)
A thermal transfer image-receiving sheet of Comparative Example 2 was obtained in the same manner as in Example 1 except that the intermediate layer coating liquid 1 of Example 1 was changed to the coating liquid 4 having the following composition.
Intermediate layer coating solution 4
14 parts of chlorinated polypropylene resin
(Hard Ren B-13: Toyo Kasei Co., Ltd.)
42 parts of titanium oxide
(TCR-30 rutile type: Tochem Products)
C. I. Pigment Yellow 83 0.01 part
Carbon black 0.02 parts
38 parts of toluene
6 parts of methyl ethyl ketone
[0033]
The reflection characteristics of the surface provided with the receiving layer of each of the thermal transfer image receiving sheets described above were measured by a Minolta color difference meter CR-221 by the method defined in JIS-Z8722, and the method defined by JIS-Z8730 The values of L, a, and b are displayed when
The background color of the sample was also measured by the above method, and the background color of the sample and the hue of the non-printed portion of each image receiving sheet of the example and comparative example were visually compared and evaluated. did.
The evaluation criteria are as follows.
Hue comparison with sample
○: Compared to the sample, the hue can be considered the same.
X: Hue is different from the sample.
[0034]
The above measurement results and evaluation results are shown in Table 1 below.
[Table 1]

[0035]
On the other hand, a 6 μm thick polyethylene terephthalate having a dye layer ink having the following composition prepared and heat-treated on the back surface has a dry coating amount of 1.0 g / m.²After coating with a wire bar and drying, a few drops of silicone oil (X-41.4003A, Shin-Etsu Silicone) were spot-dropped on the back surface, and then spread over the entire surface to perform a back treatment coating to obtain a thermal transfer sheet. .
Dye layer forming coating solution
Disperse dye (Kayaset Blue 714: Nippon Kayaku Co., Ltd.) 4.0 parts
5.0 parts of ethyl hydroxycellulose (Hercules)
Methyl ethyl ketone / toluene (weight ratio 1/1) 80.0 parts
Dioxane 10.0 parts
[0036]
The thermal transfer image receiving sheets of the above Examples and Comparative Examples were superposed so that the dye layer surface of the thermal transfer sheet was in contact with the receiving layer surface, and heated with a thermal head from the back of the thermal transfer sheet.
The heating conditions were an output of 0.2 W / dot and a pulse width of 12 msec. When a cyan image was printed with a dot width of 6 dots / mm, all of the images were good without any omission or color unevenness.
[0037]
【The invention's effect】
  Therefore, the thermal transfer image-receiving sheet of the present invention is a thermal transfer image-receiving sheet obtained by laminating an intermediate layer and a receiving layer in this order on at least one surface of a substrate sheet.As a coloring material, a white pigment, at least one yellow pigment of dis-azo, titanium oxide and iron oxide, and carbon blackL, a, and b when the reflection characteristics of the surface containing the light receiving layer are measured by the method defined in JIS-Z8722 and displayed by the method defined by JIS-Z8730 However, when L = 87 to 94, a = −2.5 to 2, and b = 3.5 to 7.5, the transferability of the dye in the receiving layer is deteriorated or transfer unevenness occurs. It can be easily colored uniformly, and the tensile strength and tear strength do not decrease, and the resolution and hue of the non-printed part as well as the printed part are strictly matched to the sample. It becomes possible.

Claims (1)

In the thermal transfer image-receiving sheet formed by laminating an intermediate layer and a receiving layer in this order on at least one surface of the base sheet, the intermediate layer is used as a color material, a white pigment, a dis-azo type, a titanium oxide type, The reflection characteristic of the surface containing at least one yellow pigment in the iron oxide system and carbon black and provided with the receiving layer was measured by the method defined in JIS-Z8722 and defined by JIS-Z8730. The values of L, a, and b when displayed by the above method are in the ranges of L = 87 to 94, a = −2.5 to 2, and b = 3.5 to 7.5. Thermal transfer image receiving sheet.