JP2009061733A - Thermal transfer image accepting sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal transfer image accepting sheet which can obtain an image of a high concentration and a high resolution in an available thermal transfer image forming article and has smoothness, high-quality feeling or the like equivalent to print paper reproducing a silver salt photograph in full colors and prevents a winding slip in a winding state during a manufacturing process. <P>SOLUTION: In the thermal transfer image accepting sheet, a porous film is laminated on at least one surface of a substrate sheet and a dye receiving layer is formed on the porous film. The substrate sheet is provided with polyolefin resin layers at both sides of a core material composed of a non-coated sheet, wherein the polyolefin resin layer has a thickness of the polyolefin resin layer 1 on the dye receiving layer thinner than that of the polyolefin resin layer 2 on the rear side, and the substrate sheet and the porous film are stuck to each other by an adhesive agent layer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a thermal transfer image-receiving sheet provided with a dye-receiving layer on a base sheet, and particularly to a photographic paper that reproduces a full-color silver salt photograph in which a high-density, high-resolution image is obtained in the obtained thermal transfer image formation product. And a thermal transfer image-receiving sheet that has the same smoothness and texture as in the above, and that prevents winding deviation in the winding state in the manufacturing process.

  Conventionally, among various thermal transfer recording systems, a thermal sublimation transfer system and a thermal fusion transfer system have been widely used. Among these, the heat-sensitive sublimation transfer method uses a sublimation dye as a color material, and uses a heating device such as a thermal head that controls heat generation according to image information, using a sublimation dye layer formed on a thermal transfer sheet. The dye inside is transferred to the thermal transfer image-receiving sheet to form an image.

  According to this heat-sensitive sublimation transfer method, the amount of dye transfer can be controlled in dot units by heating for an extremely short time. In addition, since the coloring material is a dye, it also has excellent transparency, and the formed image is very clear and at the same time has excellent halftone reproducibility and gradation, so it has extremely high definition. A high-quality image comparable to a full-color silver salt photograph can be obtained.

  As a heat transfer image-receiving sheet for sublimation transfer (hereinafter referred to as an image-receiving sheet) used in such a heat-sensitive sublimation type transfer system, a sheet in which a color material receiving layer is formed on a base sheet is generally used. . This image receiving sheet is required to have a high degree of smoothness, texture, etc. without fine unevenness, as a matter of course, a high density and high resolution image can be obtained without density unevenness and missing dots. Therefore, as a sheet material of the thermal transfer image-receiving sheet, for example, as described in Patent Document 1, the base sheet has a configuration in which a foamed polyolefin layer is laminated on both sides of a paper core, or as in Patent Document 2 A composite film is laminated to a support as a substrate, the image receiving layer is on the composite film side of the substrate, the composite film has a thermoplastic core layer having microvoids and at least one substantially void A thermal transfer image-receiving sheet comprising a thermoplastic surface layer not included is shown.

  However, the image receiving sheet of Document 1 has fine irregularities on the image receiving surface, and there are subtle differences in surface condition and texture compared to photographic paper that reproduces a full-color silver salt photograph. There is a lack of texture, which is not satisfactory. Also in the above-mentioned document 2, there are subtle differences in surface condition and differences in texture compared to photographic paper that reproduces a full-color silver salt photograph, and there is a lack of texture in the photographic texture, which is sufficiently satisfactory is not. Patent Document 3 discloses a thermal transfer image receiving sheet in which a resin coat layer is provided on both sides of a paper substrate, and a dye receiving layer is provided on the resin coat layer on the image receiving side. However, this image-receiving sheet does not have sufficient heat insulation and cushioning properties when heated from the thermal head, and does not have high-definition reproducibility of the thermal transfer image.

  The image receiving sheet is generally a wide continuous sheet, a necessary layer such as a dye receiving layer is formed in a wound form, and then the wide image receiving sheet is divided into a plurality of roll-shaped thermal transfer. An image-receiving sheet has been commercialized. In addition, as described above, the image receiving sheet has no density unevenness or missing dots in printing, ensures a high density, high resolution image, and smoothness equivalent to photographic paper that reproduces a full-color silver salt photograph. In order to prevent texture and the like, and to prevent the thermal transfer image receiving sheet from being easily curled, a base material sheet to be used is multilayered.

JP-A-3-268998 JP-A-5-246153 Japanese Patent Laid-Open No. 5-92675

  Therefore, the present invention has been made in view of such a situation, and in the obtained thermal transfer image formed product, a high-density, high-resolution image is obtained, which is equivalent to a photographic paper that reproduces a full-color silver salt photograph. An object of the present invention is to provide a thermal transfer image-receiving sheet that has smoothness and texture as described above, and that prevents winding deviation in the winding state in the manufacturing process.

  The thermal transfer image-receiving sheet of the present invention is the thermal transfer image-receiving sheet according to claim 1, wherein a porous film is laminated on at least one surface of the base sheet, and a dye-receiving layer is further provided on the porous film. The material sheet has a polyolefin resin layer provided on both sides of a core made of uncoated paper. The polyolefin resin layer has a thickness of the polyolefin resin layer 1 on the dye receiving layer side of the polyolefin resin layer 2 on the back surface side. It is smaller than the thickness, and the substrate sheet and the porous film are bonded by an adhesive layer. With this configuration, a printed matter having the same smoothness and texture as a photographic paper that reproduces a full-color silver salt photograph, and having a high-density, high-resolution image can be obtained. Winding misalignment can be prevented.

  According to a second aspect of the present invention, the polyolefin resin layer is formed on both sides of a core material made of uncoated paper by a melt extrusion method. By this melt extrusion method, the thicknesses formed by the polyolefin resin layer 1 on the dye-receiving layer side and the polyolefin resin layer 2 on the back surface side of the core material of uncoated paper can be accurately controlled and adjusted.

  The thermal transfer image-receiving sheet of the present invention has a smoothness and texture equivalent to that of a photographic paper that reproduces a full-color silver salt photograph in which a high-density, high-resolution image is obtained in the resulting thermal transfer image formed product. Winding deviation could be prevented in the winding state in the manufacturing process.

  FIG. 1 is a schematic sectional view showing one embodiment of the thermal transfer image-receiving sheet 1 of the present invention. A polyolefin resin layer 1 (8) and a polyolefin resin layer 2 (9) are provided on both sides of an uncoated paper core material 7. In the base material sheet 2 provided, an adhesive layer 5, a porous film 3, an intermediate layer 6, and a dye receiving layer 4 are sequentially formed on the polyolefin resin layer 1. Comparing the thicknesses of the polyolefin resin layer 1 (8) on the dye receiving layer side and the polyolefin resin layer 2 (9) on the back surface side, the polyolefin resin layer 1 (8) is smaller. In FIG. 1, the intermediate layer 6 is provided between the porous film 3 and the dye receiving layer 4. However, the intermediate layer is provided as necessary, and may be omitted.

Hereinafter, each layer constituting the thermal transfer image receiving sheet of the present invention will be described in detail.
(Substrate sheet)
The base sheet 2 of the thermal transfer image receiving sheet used in the present invention is one in which polyolefin resin layers 1 and 2 (8, 9) are provided on both sides of a core material 7 made of uncoated paper. Since the base sheet has a role of holding the dye-receiving layer and heat is applied during thermal transfer, the base sheet preferably has a mechanical strength that does not hinder handling even in a heated state.

  As the core material 7 made of paper, uncoated paper mainly composed of commonly used pulp is used. Examples of the non-coated paper include base paper, photographic base paper, and high-quality paper. By using uncoated paper as the core material, costs can be reduced compared to when coated paper is used. The thickness of the core material may be arbitrary, and is usually about 10 to 300 μm.

  There are two types of polyolefin resin layers constituting the base sheet, as viewed from the core material, the polyolefin resin layer 1 on the dye-receiving layer side and the polyolefin resin layer 2 on the back side. Examples include high-density polyethylene, medium-density polyethylene, low-density polyethylene, polypropylene, polybutene, polyisobutene, polyisobutylene, polybutadiene, polyisoprene, and ethylene copolymers such as ethylene-vinyl acetate copolymer. Medium density polyethylene and low density polyethylene are preferably used. In order to improve whiteness, it is preferable to add a filler such as titanium oxide to the polyolefin resin layer 1 on the dye receiving layer side.

  For the polyolefin resin layer 1 and the polyolefin resin layer 2, the above-mentioned resins can be used. However, in practice, it is preferable to adjust the curl balance and the like of the base sheet by using the same material. Comparing the thickness of the polyolefin resin layer 1 on the dye receiving layer side and the polyolefin resin layer 2 on the back surface side, the polyolefin resin layer 1 on the dye receiving layer side is characterized by a smaller point. Specifically, The polyolefin resin layer 1 has a thickness of about 5 to 25 μm, and the polyolefin resin layer 2 has a thickness of about 20 to 40 μm. The difference in thickness between the polyolefin resin layer 1 and the polyolefin resin layer 2 is about 5 to 30 μm. However, the thickness of the polyolefin resin layer 1 is smaller than the thickness of the polyolefin resin layer 2. If the difference in thickness is too small or too large, the thermal transfer image receiving sheet tends to curl.

  The polyolefin resin layers 1 and 2 can be formed by adjusting the above-mentioned resin coating solution and coating and drying, or can be formed on a core made of paper by a melt extrusion method. In the present invention, it is particularly efficient and preferable to form the polyolefin resin layer by the melt extrusion method and to form the polyolefin resin layer 1 and the polyolefin resin layer 2 by coextrusion. Further, the formation of the polyolefin resin layer by the extrusion method has an advantage that the thickness can be accurately controlled.

  When the thickness of the polyolefin resin layer 1 on the dye receiving layer side is larger than the thickness of the polyolefin resin layer 2 on the back side, or when the thicknesses of the polyolefin resin layer 1 and the polyolefin resin layer 2 are the same, curling of the thermal transfer image receiving sheet occurs. It becomes easy. Further, when the polyolefin resin layer 1 is not formed, a winding shift in a winding state is greatly generated in the manufacturing process of the thermal transfer image receiving sheet, and a problem that the thermal transfer image receiving sheet cannot be manufactured normally stably is likely to occur.

(Porous film)
The porous film 3 used in the thermal transfer image-receiving sheet of the present invention is not particularly limited as long as it is a porous film having a high surface glossiness, but because of its flexibility, it has excellent adhesion to the thermal head, and productivity. A porous film having a fine void inside is preferred, using polyolefin, particularly polypropylene, as the base resin.

  As a method for producing fine voids in the film, a compound is prepared by kneading organic fine particles or inorganic fine particles (one or more types) incompatible with the resin serving as the base of the film. Microscopically, this compound forms a fine sea-island structure with the base resin and fine particles incompatible with the base resin, and the compound is formed into a film and stretched to form the sea-island interface. The above-mentioned fine voids are generated by peeling off or large deformation of the region forming the island.

  As a method for forming the fine voids, for example, a method in which polypropylene is mainly used and polyester or acrylic resin having a melting point higher than that of polypropylene is added thereto. In this case, polyester or acrylic resin serves as a nucleating agent that forms fine voids. It is preferable that content of this polyester and an acrylic resin is 2-10 mass parts with respect to 100 mass parts of polypropylene in any case. When the content is less than 2 parts by mass, the generation of fine voids is insufficient, so that sufficient printing sensitivity cannot be obtained. Moreover, when content exceeds 10 mass parts, since the heat resistance of a porous film, etc. fall, it is unpreferable.

  Moreover, when producing the porous film which uses polypropylene as the base resin, it is preferable to add polyisoprene in order to generate finer and more dense voids. Thereby, higher printing sensitivity can be obtained. For example, a porous film having high printing sensitivity can be obtained by preparing a compound composed mainly of polypropylene, blended with acrylic resin or polyester, and polyisoprene, forming a compound, and stretching. The thickness of the porous film is preferably 30 μm or more, particularly preferably 30 to 60 μm. If the thickness of the porous film is less than 30 μm, the porous film is crushed when an image is printed, and the image quality is impaired. On the other hand, when the thickness exceeds 60 μm, the image becomes good, but the thermal transfer image-receiving sheet becomes unnecessarily thick, which is not preferable in terms of cost.

(Adhesive layer)
The adhesive layer 5 for laminating the base sheet and the porous film can be appropriately selected according to a laminating method such as dry lamination, wet lamination, and a method of bonding by electron beam irradiation after pasting. Yes, it is not limited. As an adhesive used in the adhesive layer, for example, vinyl acetate resin, acrylic resin, vinyl acetate-acrylic copolymer resin, vinyl acetate-vinyl chloride copolymer resin, ethylene-vinyl acetate copolymer resin, polyamide resin, The thing which uses polyvinyl acetal resin, polyester resin, polyurethane resin, etc. as a component is mentioned.

(Dye-receiving layer)
The dye receiving layer 4 in the thermal transfer image receiving sheet of the present invention is for receiving the sublimation dye transferred from the thermal transfer sheet and maintaining the formed image. As the resin for forming the receiving layer, polycarbonate resin, polyester resin, polyamide resin, acrylic resin, cellulose resin, polysulfone resin, polyvinyl chloride resin, polyvinyl acetate resin, vinyl chloride-acetic acid Examples thereof include vinyl copolymer resins, polyvinyl acetal resins, polyvinyl butyral resins, polyurethane resins, polystyrene resins, polypropylene resins, polyethylene resins, ethylene-vinyl acetate copolymer resins, and epoxy resins.

  The thermal transfer image-receiving sheet of the present invention can contain a release agent in the receiving layer in order to improve the releasability from the thermal transfer sheet. Various release agents such as solid waxes such as polyethylene wax, amide wax, Teflon (registered trademark), fluorine-based or phosphate-based surfactant, silicone oil, reactive silicone oil, curable silicone oil, etc. Silicone oil, various silicone resins and the like can be mentioned, and silicone oil is preferable. An oily oil can be used as the silicone oil, but a curable oil is preferred. Examples of the curable silicone oil include a reaction curable type, a photo curable type, and a catalyst curable type, and a reaction curable type and a catalyst curable type silicone oil are particularly preferable.

  As the reactive silicone oil, those obtained by reaction-curing amino-modified silicone oil and epoxy-modified silicone oil are preferable. As amino-modified silicone oil, KF-393, KF-857, KF-858, X-22-3680 are used. X-22-3801C (above, manufactured by Shin-Etsu Chemical Co., Ltd.) and the like, and epoxy-modified silicone oils such as KF-100T, KF-101, KF-60-164, KF-103 (above, Shin-Etsu Chemical) Etc.). Examples of the catalyst curable silicone oil include KS-705, FKS-770, and X-22-1212 (manufactured by Shin-Etsu Chemical Co., Ltd.).

  The addition amount of these curable silicone oils is preferably 0.5 to 30% by mass of the resin constituting the receiving layer. Alternatively, the release agent layer may be provided by partially dissolving and dispersing the release agent in a suitable solvent on the surface of the receptor layer and then drying. As the release agent constituting the release agent layer, the reaction cured product of the amino-modified silicone oil and the epoxy-modified silicone oil described above is particularly preferable, and the thickness of the release agent layer is 0.01 to 5.0 μm, particularly 0.05-2.0 micrometers is preferable. When forming the receptor layer by adding silicone oil, the release agent layer can be formed even if the silicone oil bleed out on the surface after application is cured. In the formation of the receiving layer, pigments such as titanium oxide, zinc oxide, kaolin, clay, calcium carbonate, fine powder silica and the like are used for the purpose of improving the whiteness of the receiving layer and further enhancing the clarity of the transferred image. Fillers can be added. Further, a plasticizer such as a phthalic acid ester compound, a sebacic acid ester compound, or a phosphoric acid ester compound may be added.

The thermal transfer image-receiving sheet of the present invention has a thermoplastic resin as described above and other necessary additives such as a mold release agent, a plasticizer, a filler, a crosslinking agent, and a curing agent on at least one surface of the base sheet. , A catalyst, a heat release agent, an ultraviolet absorber, an antioxidant, a light stabilizer, and the like are dissolved in a suitable organic solvent, or a dispersion dispersed in an organic solvent or water is used, for example, a gravure printing method It is obtained by applying and drying by a forming means such as a screen printing method or a reverse roll coating method using a gravure plate to form a dye receiving layer. Application of an intermediate layer or the like, which will be described later, is also carried out by the same method as that for forming the dye-receiving layer. The coating amount of the thus formed are dye-receiving layer, usually, 0.5 to 50 g / m ² approximately in the dry state, preferably 2 to 10 g / m ^2. Such a dye-receiving layer is preferably a continuous coating, but may be formed as a discontinuous coating.

(Middle layer)
Between the dye-receiving layer and the porous film, for the purpose of imparting adhesion, whiteness, cushioning, concealing property, antistatic property, anti-curling property, etc. between the dye-receiving layer and the porous film, conventionally known Any intermediate layer can be provided. The binder resin used for the intermediate layer is polyurethane resin, polyester resin, polycarbonate resin, polyamide resin, acrylic resin, polystyrene resin, polysulfone resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinyl chloride- Examples include vinyl acetate copolymer resins, polyvinyl acetal resins, polyvinyl butyral resins, polyvinyl alcohol resins, epoxy resins, cellulose resins, ethylene-vinyl acetate copolymer resins, polyethylene resins, polypropylene resins, and the like. Of these, those having an active hydroxyl group can further be used as a cured product thereof.

Moreover, it is preferable to add fillers such as titanium oxide, zinc oxide, magnesium carbonate, and calcium carbonate in order to impart whiteness and concealability. Furthermore, stilbene compounds, benzimidazole compounds, benzoxazole compounds, etc. are added as fluorescent brighteners to enhance whiteness, and hindered amine compounds, hindered phenol compounds to enhance the light fastness of printed materials. Benzotriazole compounds, benzophenone compounds, etc. may be added as UV absorbers or antioxidants, or cationic acrylic resins, polyaniline resins, various conductive fillers, etc. may be added to impart antistatic properties. it can. The coating amount of the intermediate layer is preferably about 0.5 to 30 g / m ^{2 in} a dry state.

Next, the present invention will be described more specifically with reference to examples. Hereinafter, unless otherwise specified, parts or% is based on mass.
(Example 1)
A high-density polyethylene resin (J-Rex KH578A, manufactured by Nippon Polyolefin Co., Ltd.) is extruded on both sides of a white base paper (uncoated paper) with a thickness of 150 g / m ^{2 that is} the paper core material 7 on the dye receiving layer side. The polyolefin resin layer 1 and the polyolefin resin layer are coated on the white base paper of the uncoated paper core 7 by melt-coextrusion so that the polyolefin resin layer 1 of the resin is 20 μm and the polyolefin resin layer 2 on the back side is 30 μm. 2 were laminated | stacked and the base material sheet 2 was produced.

Using a porous polypropylene film (Toyopearl SS, manufactured by Toyobo Co., Ltd.) having a thickness of 35 μm as the porous film 3, using the base material sheet 2 prepared above and an adhesive having the following composition, gravure The adhesive layer 5 was formed so as to be coated with a coater and dried to have a coating amount of 5 g / m ² , and bonded and laminated by a dry laminating method.
(Coating solution composition for adhesive layer)
Hydroxyl-containing oligomer 16 parts (Takelac A-31, manufactured by Mitsui Chemicals Polyurethanes)
20 parts of urethane oligomer having an isocyanate group (Takenate A-231, manufactured by Mitsui Chemicals Polyurethane Co., Ltd.)
64 parts of ethyl acetate

On the porous film 3 of the laminate in which the porous film 3 and the base sheet 2 are bonded to the adhesive layer 5, the intermediate layer coating solution having the following composition is dried to be ² g / m ^2. After coating with a gravure coater and drying at 110 ° C. for 1 minute, a coating solution for the dye-receiving layer having the following composition was applied on the gravure coater so as to be 4 g / m ² after drying. And dried for 1 minute to produce a thermal transfer image-receiving sheet of Example 1. However, the base material sheet 2 and the base material of the porous film 3 are all continuous sheets having a width of 1000 mm, and each of the melt extrusion, the dry lamination, the intermediate layer, and the dye receiving layer is applied continuously. The process was performed in the form of supplying and discharging in the form of a winding.

(Coating liquid composition for intermediate layer)
Polyester resin (WR-905, manufactured by Nippon Synthetic Chemical Co., Ltd.) 13.1 parts Titanium oxide (TCA-888, manufactured by Tochem Products) 26.2 parts Optical brightener 0.39 parts (benzimidazole derivative, product) Name: Ubitex BAC, manufactured by Ciba Specialty Chemicals)
60 parts of water / isopropyl alcohol [IPA] (mass ratio 2/1)

(Coating solution composition for dye-receiving layer)
Vinyl chloride-vinyl acetate copolymer (Solvine C, manufactured by Nissin Chemical Industry Co., Ltd.) 60 parts Epoxy-modified silicone (X-22-3000T, manufactured by Shin-Etsu Chemical Co., Ltd.) 1.2 parts Methylstil-modified silicone (24 -510, manufactured by Shin-Etsu Chemical Co., Ltd.) 0.6 parts methyl ethyl ketone / toluene (mass ratio 1/1) 5 parts

(Example 2)
A thermal transfer image receiving sheet of Example 2 was prepared in the same manner as in Example 1 except that the thermal transfer image receiving sheet prepared in Example 1 was changed so that the polyolefin resin layer 2 was 25 μm.

(Example 3)
Example 3 was the same as Example 1 except that the thermal transfer image-receiving sheet produced in Example 1 was changed so that the polyolefin resin layer 1 was 15 μm and the polyolefin resin layer 2 was 30 μm. A thermal transfer image receiving sheet was prepared.

Example 4
Example 4 was the same as Example 1 except that the thermal transfer image-receiving sheet produced in Example 1 was changed so that the polyolefin resin layer 1 was 8 μm and the polyolefin resin layer 2 was 28 μm. A thermal transfer image receiving sheet was prepared.

(Example 5)
Example 5 was the same as Example 1 except that the thermal transfer image-receiving sheet produced in Example 1 was changed so that the polyolefin resin layer 1 was 12 μm and the polyolefin resin layer 2 was 28 μm. A thermal transfer image receiving sheet was prepared.

(Comparative Example 1)
In the thermal transfer image-receiving sheet prepared in Example 1, the uncoated paper core material 7 was changed to coated paper (NK High Coat, manufactured by Nippon Processing Paper Co., Ltd.) with a thickness of 150 g / m ² under the conditions of the base material sheet 2. Further, the polyolefin resin layer 1 on the dye receiving layer side was not provided, and the polyolefin resin layer 2 was further changed to 35 μm. Other conditions were the same as in Example 1, and a thermal transfer image receiving sheet of Comparative Example 1 was produced.

(Comparative Example 2)
In the thermal transfer image-receiving sheet produced in Example 1, the uncoated paper core 7 was changed to a high-quality paper having a thickness of 150 g / m ² under the conditions of the base sheet 2 and the polyolefin resin layer 1 on the dye-receiving layer side was changed. Without being provided, the polyolefin resin layer 2 was further changed to 25 μm. Other conditions were the same as in Example 1, and a thermal transfer image receiving sheet of Comparative Example 2 was produced.

  For each of the above Examples and Comparative Examples, as the suitability in the coating process of the intermediate layer and the dye receiving layer, evaluation of winding deviation in winding of the discharge portion, and each of the obtained thermal transfer image receiving sheets was used. The printing was performed under the following conditions, and the texture of the printed material was evaluated as follows.

(Winding misalignment)
The intermediate layer and the dye receiving layer are coated on the discharge unit of the discharge unit of the intermediate layer and the dye receiving layer, and the intermediate layer and the dye receiving layer are continuously coated on the discharge unit under the condition of providing a meandering prevention mechanism such as an edge guide The winding deviation in the winding form at the time of winding was examined and evaluated according to the following criteria.
○: There was no noticeable winding deviation in winding up the discharge section, and the thermal transfer image-receiving sheet could be produced normally and stably. Note that the winding deviation had a maximum-minimum step on the winding side surface of less than 2.0 cm.
×: Winding misalignment occurs greatly, the step on the winding side is maximum-minimum, 10 cm or more, the rolled-up appearance is poor, the next process or transportation is hindered, and the sheet of the final product In the form, distortion occurred.

(Texture)
Using the digital photo printer Megapixel III manufactured by Altec Co., Ltd., images using the thermal transfer sheets prepared in Examples and Comparative Examples, and a genuine Megapixel III thermal transfer sheet, a gray hue with a gradation value of 50/255 (Highlight image) was printed, and the texture was evaluated by visual observation according to the following criteria.
○: Gray highlight The image area is uniform, and in the surface state, the fibers of the underlying paper core material are not observed to be dispersed, and smoothness equivalent to photographic paper that reproduces a full-color silver salt photograph , Texture and texture.
△: Gray highlight The photographic paper that reproduces a full-color silver salt photograph in which the texture of the surface of the base coated paper substrate is partially observed in the surface state of the image area and the texture is anxious. Compared to the above, it lacked smoothness, texture and texture, and was not satisfactory. (This is an intermediate result of the evaluation of ○ and ×, but it is not satisfactory.)
×: Gray highlight Image area where the fibers of the core paper core are observed to be dispersed, and the texture is quite worrisome. The print reproduces a full-color silver salt photograph. Compared with paper, it lacked smoothness, texture, and texture.

Table 1 shows the results of the evaluation of the above-mentioned winding deviation and the evaluation of the texture in the printed matter.

  In the results of Table 1 above, in Examples 1 to 5, in the thermal transfer image receiving sheet in which the porous film is laminated on one surface of the base sheet and the dye receiving layer is further provided on the porous film, The base sheet is provided with a polyolefin resin layer 1 (dye-receiving layer side) and a polyolefin resin layer 2 (back side) on both sides of a core made of uncoated paper. The polyolefin resin layer 1 is a polyolefin resin layer. Compared with the thickness of 2, the polyolefin resin layer 1 on the dye-receiving layer side is smaller, and the base sheet and the porous film are bonded together with an adhesive layer to prevent winding deviation under the above conditions. It was also possible to evaluate the texture under the above conditions. On the other hand, the thermal transfer image-receiving sheet of Comparative Example 1 has a configuration in which the core is coated paper and the polyolefin resin layer 1 (dye-receiving layer side) is not provided, and the evaluation of the texture under the above conditions is not satisfactory. There wasn't. This can be determined by providing the polyolefin resin layer 1 (dye receiving layer side) to improve the texture of the texture. The thermal transfer image-receiving sheet of Comparative Example 2 has a structure in which the core material is uncoated paper high-quality paper but is not provided with the polyolefin resin layer 1 (dye-receiving layer side). Resulting in.

It is a schematic sectional drawing which shows one embodiment of the thermal transfer image receiving sheet of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thermal transfer image receiving sheet 2 Base material sheet 3 Porous film 4 Dye receiving layer 5 Adhesive layer 6 Intermediate layer 7 Uncoated paper core material 8 Polyolefin resin layer 1
9 Polyolefin resin layer 2

Claims (2)

  In a thermal transfer image-receiving sheet in which a porous film is laminated on at least one surface of a base sheet and a dye-receiving layer is further provided on the porous film, the base sheet is formed on both sides of a core made of uncoated paper. The polyolefin resin layer has a thickness of the polyolefin resin layer 1 on the dye receiving layer side smaller than the thickness of the polyolefin resin layer 2 on the back surface side, and is porous with the substrate sheet. A thermal transfer image-receiving sheet, wherein the film is bonded by an adhesive layer. 2. The thermal transfer image receiving sheet according to claim 1, wherein the polyolefin resin layer is formed on both sides of a core material made of uncoated paper by a melt extrusion method.

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