JP2005169945A - Thermal transfer receiving sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal transfer receiving sheet of high sensitivity and high image quality which is suited particularly for a dyestuff thermal transfer printer, of which the laminated part of the support has good adhesion strength, which is free of indentations of the receiving sheet on the occasion of printing and free of ribbon crease transfer or the like on a printing surface and which has a high printing density and excels in image uniformity. <P>SOLUTION: The thermal transfer receiving sheet has the sheet-like support formed of a cushion layer containing hollow particles and a thermoplastic resin film layer which are stacked sequentially on at least one side of a core layer, and an image receiving layer formed on the thermoplastic resin film layer. The thermoplastic resin film layer is laid on the cushion layer with an adhesive layer interlaid. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a thermal transfer receiving sheet (hereinafter simply referred to as a receiving sheet) used in a printer for transferring an image of a thermal transfer dye sheet to an image receiving layer by heat to form an image. More specifically, the present invention relates to a receiving sheet that is suitable for a thermal printer, particularly a dye thermal transfer printer, and can obtain an image having a high density similar to a silver salt photograph and an image quality excellent in uniformity.

  In recent years, among thermal printers, dye thermal transfer printers capable of printing clear full-color images have attracted attention. The dye thermal transfer printer includes a dye layer containing a dye of a thermal transfer dye sheet (hereinafter simply referred to as an ink ribbon), and an image receiving layer (hereinafter simply referred to as a receiving layer) containing a dye dyeable resin of the receiving sheet. And a dye at a predetermined position of the dye layer is transferred onto the receiving layer by a predetermined concentration by heat supplied from a thermal head or the like to form an image. The ink ribbon has a dye layer of three colors of yellow, magenta, and cyan, or four colors obtained by adding black to this. A full-color image is obtained by repeatedly transferring each color dye on the ink ribbon to the receiving sheet in order.

  The image quality of recorded images in thermal transfer printers has been greatly improved by the development of digital image processing technology using computers, and the market for thermal transfer systems is expanding. In addition, as the demand for higher speed and higher sensitivity of the printing system increases, it becomes an important technical issue how to efficiently use the heat generated by the heating device for image formation as the thermal head temperature control technology improves. ing. With the increase in printing speed, improvements such as prevention of color misregistration have become a new technical issue in order to obtain fine image quality. In the printer, a receiving sheet is sandwiched between a metal roll and a rubber roll fitted with spikes, and the printing speed is increased.For example, there are methods to increase the nip pressure between rolls or increase the spikes. Has been tried. However, in such a method, a dent is produced in the stamp screen of the receiving sheet, and the commercial value is lowered. Accordingly, it is required that the receiving sheet is not depressed even when the compressive force is applied by the transport roll.

The receiving sheet is generally composed of a support and a receiving layer formed on the surface thereof. When paper is used as the support substrate, for example, there is a problem that heat from the thermal head escapes to the support and recording sensitivity is insufficient. In addition, unevenness in the density of the print occurs due to uneven contact between the ink ribbon and the receiving layer due to uneven density of paper fibers.
In order to improve these problems, a receiving sheet is disclosed in which an intermediate layer containing hollow particles is provided between the paper support and the receiving layer. (For example, refer to Patent Documents 1 and 2.) Such a receiving sheet is improved in sensitivity due to the effect of improving the heat insulating property and cushioning property of the intermediate layer containing hollow particles, but the hollow particles are in the intermediate layer. Since it is exposed on the surface, there are irregularities on the surface of the receiving sheet, resulting in poor surface smoothness. In particular, it is difficult to obtain sufficient image quality by printing with a current high-speed printer. In addition, the intermediate layer containing the hollow particles is crushed due to heat during printing, and the receiving sheet is dented to deteriorate the appearance, and it is difficult to control the recording density in color overprinting. Furthermore, since the compression elastic modulus of the intermediate layer is lower than the compression elastic modulus of the core material, the intermediate layer is liable to be crushed by the pressure at the time of conveyance and printing of the printer, and there is a problem that the quality of the receiving sheet is impaired.

  When a normal film is used as the support substrate, the film has excellent smoothness, but heat from the thermal head moves into the substrate, resulting in insufficient recording sensitivity, and the film does not have sufficient cushioning properties. Therefore, the adhesion between the ink ribbon and the receiving sheet is insufficient, resulting in density unevenness. In order to solve this problem, as a support, a support in which a foam film is bonded to a core material layer such as paper (for example, see Patent Document 3), a thermoplastic resin such as polyolefin resin as a main component, a void A support or the like in which a biaxially stretched film (synthetic paper) including a (void) structure is bonded to a core material layer such as paper has been proposed (for example, see Patent Document 4). Although the receiving sheet using these supports is excellent in heat insulation and smoothness, there is a problem that the receiving sheet has a dent due to pressure during conveyance and printing in a printer and the appearance is impaired.

  Further, in order to improve the cushioning property of the receiving sheet, it has been proposed to include a microballoon in the adhesive layer when bonding the polyolefin layer having no void and the core material layer. (For example, refer to Patent Document 5). However, since the density of microballoons is low, it is difficult to mix evenly in the adhesive, and since the solvent resistance is poor, adhesives containing organic solvents cannot be used and sufficient adhesive strength cannot be obtained. There was a problem. Furthermore, if an amount of microballoons that gives sufficient space to improve the cushioning properties and sensitivity of the receiving sheet is added to the adhesive layer, the adhesive strength of the adhesive layer decreases and the adhesive strength of the bonded support is sufficient. Therefore, there is a drawback that the adhesive is not able to be obtained and the adhesive protrudes from the end face, and improvement is demanded.

JP-A-63-87286 (pages 1 and 2) JP-A-1-27996 (pages 1 to 3) JP 61-197282 A (first page) JP-A-62-198497 (first page) JP-A-6-239040 (pages 2 to 4)

  The present invention has been made in view of the above circumstances, and solves the above-described problems of conventional receiving sheets, and is particularly suitable for dye thermal transfer printers, and the laminated portion of the support has good adhesive strength. In addition, the present invention intends to provide a high-sensitivity, high-quality thermal transfer receiving sheet that has no dent of the receiving sheet at the time of printing, has no ribbon wrinkle transfer on the printing screen, has high printing density, and excellent image uniformity. .

The present invention includes the following inventions.
(1) A sheet-like support in which a cushion layer containing a hollow particle and a thermoplastic resin film layer are sequentially laminated on at least one surface of a core material layer, and an image receiving layer formed on the thermoplastic resin film layer, A thermal transfer receiving sheet, wherein the thermoplastic resin film layer is laminated on a cushion layer via an adhesive layer.
(2) The thermal transfer receiving sheet according to item (1), wherein the hollow particles have an average particle size of 0.4 to 20 μm.
(3) The thermal transfer receiving sheet according to (1) or (2), wherein the volumetric hollowness of the hollow particles is 50 to 97%.
(4) The thickness of the said cushion layer is 10-100 micrometers, and the thickness of a cushion layer is 3 times or more of the average particle diameter of the said hollow particle, Any one of (1) term-(3) term The thermal transfer receiving sheet according to 1.
(5) The thermal transfer according to any one of (1) to (4), wherein the sheet-like support has a thermoplastic resin layer on the other surface where the core layer cushion layer is not laminated. Receptor sheet.
(6)
Any of the items (1) to (4), wherein the sheet-like support has a thermoplastic resin film layer laminated via an adhesive layer on the other surface where the core layer cushion layer is not laminated. The thermal transfer receiving sheet according to claim 1.
(7)
The thermal transfer receiving sheet according to any one of (1) to (6), wherein the thermoplastic resin film layer is a stretched porous polyolefin resin film or a stretched porous polyester resin film.
(8)
The thermal transfer receiving sheet according to any one of (1) to (7), wherein the core material layer is a paper base material mainly composed of cellulose pulp.
(9)
The thermal transfer receiving sheet according to any one of items (1) to (8), wherein the compression elastic modulus of the entire thermal transfer receiving sheet measured in accordance with JIS K7220 is 50 MPa or less.

  The thermal transfer receiving sheet of the present invention has an appropriate compression elastic modulus as a whole receiving sheet and a good adhesion strength of the laminated part of the support, there is no dent of the receiving sheet at the time of printing, and there is no ribbon wrinkle transfer on the printing screen. In addition, it is a receiving sheet from which a high-sensitivity, high-quality and good print image can be obtained.

  In the present invention, the sheet-like support has a cushion layer containing hollow particles on at least one surface of the core material layer, and a laminated support having a thermoplastic resin film layer laminated thereon via an adhesive layer The receptor layer is formed on the thermoplastic resin film layer.

  The receiving sheet of the present invention has a cushion layer containing hollow particles, so that the compression elastic modulus of the entire receiving sheet can be reduced, the receiving sheet is given a suitable degree of deformation, a thermal head, an ink ribbon, etc. Since the shape following property and adhesion of the receiving sheet with respect to the shape of the ink sheet are improved, it is possible to prevent printing defects due to ribbon wrinkles generated on the ink ribbon. Also, since the compression modulus of the entire receiving sheet is reasonably low, it immediately recovers when the pressure is removed when it is sandwiched between the thermal head and the platen roll, and the adhesion between the thermal head and the receiving sheet is low even in a low energy state. As a result, the thermal efficiency of the thermal head is improved, so that the print density of the image can be increased and the image quality can be improved.

  For example, in the case of a configuration in which hollow particles are contained in the adhesive layer, it is difficult to uniformly disperse with the adhesive component because the density of the hollow particles is small in the preparation of the coating liquid, and the sensitivity is improved. When a sufficient amount of hollow particles is added to the adhesive layer, there is a problem that the adhesive strength of the adhesive layer is lowered and the strength of the laminated portion of the support becomes insufficient. The cushion layer of the present invention contains hollow particles and a binder resin as described later as main components, and these are easy to uniformly disperse in the preparation of the coating liquid, and further do not contain hollow particles. By laminating the cushion layer and the thermoplastic resin film via the film, the strength of the laminated portion of the support is sufficiently maintained.

(Core material layer)
The core layer of the sheet-like support of the present invention is not particularly limited. For example, a paper base material, or a polyester film, a polyolefin film or the like can be used. Is preferably used. As the paper substrate, papers mainly composed of cellulose pulp are used. Papers mainly composed of cellulose pulp are preferably used because they have low heat shrinkability, good heat insulation, paper texture as a receiving sheet, and are inexpensive. For example, apply pressure on wood pulp such as hardwood pulp, softwood pulp, hardwood softwood mixed pulp, paper made from commonly used pulp such as kraft pulp, sulfite pulp, soda pulp, or calendar after papermaking. Paper having improved surface smoothness, for example, by being compressed. Moreover, you may have a coating layer which coated the pigment as needed.

  Specific examples of the paper substrate include non-coated paper such as high-quality paper and medium-sized paper, coated paper such as coated paper, art paper, and cast coated paper, and heat such as polyolefin resin on at least one surface of the base paper. Examples include laminated paper provided with a plastic resin layer, synthetic resin-impregnated paper, and paperboard. Moreover, you may perform a calendar process for high smoothing. Among these paper base materials, non-coated paper such as high-quality paper and medium-quality paper, coating, etc. from the viewpoint of production such as smoothness, texture as a receiving sheet obtained, cushioning layer coating drying property to be laminated Coated paper such as paper, art paper and cast coated paper can be used more preferably.

  The core layer preferably has a thickness of 40 to 180 [mu] m, more preferably 50 to 150 [mu] m. Incidentally, if the thickness of the core layer is less than 40 μm, the mechanical strength thereof is insufficient, the rigidity of the receiving sheet obtained therefrom is small, and the repulsive force against deformation is insufficient, and the curling of the receiving sheet that occurs at the time of printing. May not be sufficiently prevented. Also, if the thickness exceeds 180 μm, the thickness of the receiving sheet obtained becomes excessive, so that the number of receiving sheets stored in the printer is reduced or the capacity of the printer is increased when trying to store a predetermined number of receiving sheets. This may cause problems such as making it difficult to make the printer compact.

(Cushion layer)
In this invention, the cushion layer provided on a core material layer can reduce the compression elastic modulus of a receiving sheet by containing a hollow particle. Therefore, even if the receiving sheet is subjected to high pressure by the conveying roll in the printer, it is possible to absorb this stress inside the cushion layer, so that the resistance of the receiving sheet to dents and spike marks formed by the conveying roll is improved. Is done. Also, the receiving sheet is given a suitable degree of deformation freedom, and the followability of the receiving sheet to the thermal head shape and the ink ribbon shape, adhesion, etc. are improved, so the thermal efficiency of the thermal head to the receiving layer is improved even in a low energy state, The print density of the printed image can be increased and the image quality can be improved. In addition, in a high energy application region of a high-speed printer, it is possible to simultaneously prevent printing defects due to ribbon wrinkles generated on the ink ribbon.

The hollow particles used in the cushion layer of the present invention are composed of a shell formed of a polymer material and one or more hollow (pore) portions surrounded by the shell, and the average particle diameter is It is preferable that it is 0.4-20 micrometers, More preferably, it is 0.5-15 micrometers, More preferably, it is 0.5-10 micrometers. Although there is no special restriction | limiting in the manufacturing method of a hollow particle, For example, it can select from what was manufactured as follows.
(A) Expanded hollow particles produced by heating and foaming a thermoplastic polymer material containing a thermally expandable substance (hereinafter simply referred to as “foamed hollow particles”).
(B) The pore-forming material is volatilized and escaped from the microcapsule produced by the microcapsule polymerization method using the polymer-forming material as the shell-forming material and the volatile liquid as the pore-forming material. Microcapsule-like hollow particles obtained in this manner (hereinafter simply referred to as microcapsule-like hollow particles).
The average particle size of the hollow particles can be measured using a general particle size measuring device, and is measured using, for example, a laser diffraction type particle size distribution measuring device (trade name: SALD2000, manufactured by Shimadzu Corporation). .

  The volume hollow ratio of the hollow particles used in the cushion layer (foamed hollow particles, microcapsule hollow particles, etc.) is preferably 50 to 97%, more preferably 55 to 95%. When the volumetric hollow ratio of the hollow particles is less than 50%, the effect of reducing the compression elastic modulus of the entire receiving sheet is not sufficiently exhibited. On the other hand, when the volumetric hollow ratio exceeds 97%, the coating film strength of the cushion layer is lowered, the cushion layer is easily damaged, and the appearance may be deteriorated.

  The volumetric hollow ratio of the hollow particles indicates the ratio of the volume of the hollow portion to the volume of the particles. Specifically, the specific gravity of the hollow particle dispersion composed of the hollow particles and the poor solvent, the hollow particles in the dispersion The specific gravity of the polymer resin forming the shell (wall) of the hollow particles and the specific gravity of the poor solvent can be obtained. The poor solvent is a solvent that does not dissolve and / or swell the resin that forms the walls of the hollow particles, and examples thereof include water and isopropyl alcohol. The average particle diameter and volumetric hollow ratio of the hollow particles can also be determined from a cross-sectional photograph of the cushion layer using, for example, a small-angle X-ray scattering measurement device (trade name: RU-200, manufactured by Rigaku Corporation).

  Cushion layer containing hollow particles by using particles made of a thermoplastic substance containing a thermally expandable substance as hollow particles as a cushion layer component in an unfoamed state and foamed by heat during heat drying in the receiving sheet manufacturing process It is also possible to form However, if thermoplastic particles containing a thermally expandable substance are foamed by heating during the manufacturing process of the receiving sheet, it may be difficult to foam to a uniform particle diameter, and a sufficiently flat cushion layer may not be obtained. For this reason, the uniformity of the thermally transferred image may be insufficient. Therefore, in the present invention, pre-expanded hollow particles produced by thermally expanding thermoplastic particles containing a thermally expandable substance in advance are preferably used.

  The foamed hollow particles include, for example, a volatile low-boiling hydrocarbon such as n-butane, i-butane, pentane, and / or neopentane as a thermally expandable core substance in a thermoplastic polymer material. Homopolymers such as vinylidene chloride, vinyl chloride, acrylonitrile, methacrylonitrile, styrene, (meth) acrylic acid, (meth) acrylic acid ester or copolymers of these as polymer materials are used as shell (wall) materials. The particles obtained by use are preliminarily heated to a predetermined particle size by subjecting them to a treatment such as heating.

  In addition, the foamed hollow particles as described above generally have a small specific gravity, and therefore, for the purpose of improving dispersibility and improving handling workability, inorganic powders such as calcium carbonate, talc, and titanium dioxide are thermally fused. Pre-foamed composite hollow particles that are adhered to the surface of the foamed hollow particles and whose surface is coated with an inorganic powder can also be used in the present invention.

  The average particle size of the pre-expanded hollow particles used in the present invention is preferably 0.4 to 20 μm, more preferably 2 to 15 μm, and further preferably 3 to 10 μm. When the average particle diameter of the pre-expanded hollow particles is less than 0.4 μm, the volumetric hollow ratio of the hollow particles is generally low, and thus the effect of reducing the compression elastic modulus of the receiving sheet may not be sufficiently exhibited. On the other hand, if the average particle diameter exceeds 20 μm, the smoothness of the resulting cushion layer surface is lowered, the uniformity of the thermal transfer image may be poor, and the image sharpness may be insufficient.

  The microcapsule-like hollow particles used in the present invention are obtained by a microcapsule-forming polymerization method, and a polymer-forming material (shell-forming material) is used as a shell (wall), and a volatile liquid (for pore formation) is formed in the core. The microcapsules containing (material) are dried to volatilize and escape the pore-forming material to form a hollow core portion. As the polymer-forming material, a hard resin such as a styrene- (meth) acrylic acid ester copolymer or a melamine resin is preferably used, and as the volatile liquid, for example, water is used.

  The average particle diameter of the microcapsule-like hollow particles used in the present invention is preferably 0.4 to 20 μm, more preferably 0.5 to 10 μm, and further preferably 0.5 to 7 μm. When the average particle diameter of the microcapsule-like hollow particles is less than 0.4 μm, the volumetric hollow ratio of the hollow particles is generally low, so the compression elastic modulus of the receiving sheet may not be sufficiently reduced, and the average particle diameter is If it exceeds 20 μm, the smoothness of the cushion layer surface obtained is lowered, the uniformity of the thermal transfer image becomes poor, and the image sharpness may be insufficient.

  The mass ratio of the hollow particles to the total solid content of the cushion layer is preferably 10 to 80% by mass, more preferably 15 to 70% by mass. When the mass ratio of the hollow particles is less than 10% by mass, the effect of reducing the compression modulus of the receiving sheet may not be sufficiently obtained. When the mass ratio of the hollow particles exceeds 80% by mass, the cushion layer coating solution As a result, the coating property of the coating layer deteriorates and a good coated surface cannot be obtained, and the coating film strength of the cushion layer may decrease.

  The cushion layer of the present invention contains hollow particles and a binder resin as main components. The cushion layer coating solution of the present invention is preferably an aqueous coating solution in view of the solvent resistance of the hollow particles. The binder resin used is not particularly limited. For example, water-soluble resins such as polyvinyl alcohol resins, cellulose resins and derivatives thereof, casein, and starch derivatives are preferable from the viewpoints of film formability, heat resistance, and flexibility. used. In addition, water-dispersible resins of various resins such as (meth) acrylic acid ester resins, styrene-butadiene copolymer resins, urethane resins, polyester resins, ethylene-vinyl acetate copolymer resins are aqueous resins with low viscosity and high solid content. Used as. In addition, the binder resin used from the viewpoint of the coating film strength, adhesiveness, and coatability of the cushion layer can be a combination of the above water-soluble resin and various water-dispersible resins. The cushion layer surface of the present invention does not exhibit adhesiveness at room temperature and does not adhere to the thermoplastic resin film laminated on the cushion layer, so an adhesive layer is required when the cushion layer and the thermoplastic resin film are laminated. It becomes.

  The cushion layer is appropriately selected from various additives such as inorganic pigments, organic pigments, resin crosslinking agents, antistatic agents, antifoaming agents, dispersants, colored dyes, etc. May be used. As the inorganic pigment, a white inorganic pigment is preferably added to improve the opacity and whiteness of the receiving sheet. Specific examples include titanium oxide, barium sulfate, calcium carbonate, magnesium oxide, magnesium carbonate, aluminum hydroxide, sodium aluminosilicate, potassium aluminosilicate, clay, mica, talc, and calcium sulfate.

  In the present invention, the thickness of the cushion layer is preferably 10 to 100 μm, and preferably 3 times or more the average particle diameter of the hollow particles contained in the cushion layer. The thickness for the cushion layer to exhibit desired performance such as cushioning property, low compression elastic modulus, or heat insulating property is preferably 10 to 100 μm, more preferably 10 to 90 μm, and still more preferably 15 ˜85 μm. If the thickness of the cushion layer is less than 10 μm, the compression elastic modulus of the receiving sheet may not be sufficiently reduced. On the other hand, if the thickness exceeds 100 μm, the thickness of the entire receiving sheet to be obtained becomes excessive, leading to a decrease in the number of receiving sheets accommodated in the printer, or an attempt to accommodate a predetermined number causes an increase in the volume of the printer, Problems such as difficulty in making the printer more compact may occur.

The thickness of the cushion layer is preferably at least 3 times the hollow particle average particle diameter contained in the cushion layer, more preferably at least 4 times the thickness. When the thickness of the cushion layer is less than 3 times the average particle diameter of the hollow particles contained in the intermediate layer, coarse hollow particles may protrude from the cushion layer surface, and image uniformity may be reduced.
In the present invention, by providing a cushion layer, it becomes possible to use, for example, an inexpensive paper base material as a core material, and it is possible to minimize the amount of expensive foamed film etc. used economically. Is also advantageous.

  The total thickness of the core layer and the cushion layer is preferably 50% or more of the total thickness of the support, compared to the thermoplastic resin film or thermoplastic resin laminated on these front and back surfaces. It is possible to reduce the cost, and by increasing the thickness ratio between the core material layer and the cushion layer, a low-cost, high-sensitivity receiving sheet can be obtained. Moreover, since the texture of paper increases as a receiving sheet, it becomes a more preferable form.

(Thermoplastic resin film layer)
The sheet-like support of the present invention has a cushion layer containing hollow particles on at least one surface of a core material layer, and has a thermoplastic resin film layer laminated thereon via an adhesive layer. To do.
Furthermore, as the sheet-like support of the present invention, a thermoplastic resin film layer having a cushion layer containing hollow particles on one surface (surface side) of the core material layer and laminated thereon via an adhesive layer (Surface side thermoplastic resin film layer) and forming a thermoplastic resin layer or a thermoplastic resin film layer (back side thermoplastic resin film layer) on the other side (back side) of the core layer Also good. In this case, the receiving layer is formed on the surface side thermoplastic resin film layer. When a thermoplastic resin layer or a thermoplastic resin film layer is provided on the back side of the core material layer, it is possible to prevent curling of the resulting receiving sheet, and when a paper base is used for the core material layer Is effective in improving the water resistance of the receiving sheet.

  Examples of the surface side thermoplastic resin film include polyester resins, polyolefin resins, polystyrene resins, vinyl chloride resins, vinyl acetate resins, acrylic resins, urethane resins, polycarbonate resins, vinyl resins, Examples thereof include films mainly composed of various known thermoplastic resins such as polyamide resins and cellulose derivative resins. These films may be stretched. Further, it may be a white opaque film obtained from a resin composition containing the above thermoplastic resin and a white pigment for improving the whiteness of the receiving sheet and improving the sharpness of the image. Or the stretched porous film which extended | stretched the molten resin composition which added the organic and / or inorganic pigment and different resin to said thermoplastic resin, and produced | generated the space | gap may be sufficient. Moreover, in order to improve adhesiveness, the above-mentioned various thermoplastic resin films may be provided with an easy-adhesion layer on the film surface or subjected to surface treatment such as corona treatment.

  Among the thermoplastic resin films, a stretched porous thermoplastic resin film that is excellent in cushioning properties and heat insulation properties from the viewpoint of uniformity of images to be printed, gradation, printing density, price, etc. is preferably used. Among the stretched porous thermoplastic resin films, a stretched porous polyester film mainly composed of polyethylene terephthalate or a stretched porous polyolefin film (synthetic paper) composed mainly of polypropylene is particularly preferably used. The film having a porous structure may be a single-layer film having a porous structure as a whole, or may be a film having a multilayer structure including one or more layers having a porous structure. In addition to using the above material alone, it is also possible to use a multilayer structure obtained by laminating two or more of the above sheet-like films by a known method such as a dry laminating method or a wet laminating method. The combination is not limited.

  In the present invention, a stretched porous polyester film is preferably used as the surface layer side thermoplastic resin film because it is excellent in printing density, image uniformity, heat resistance, prevention of dents in the printing screen due to the compressive force of the transport roll, and the like. As the polyester film resin, for example, a homopolymer composed of terephthalic acid and ethylene glycol, or a copolymer obtained by copolymerizing terephthalic acid and ethylene glycol with a third component can be used. Such copolymers are known, and as the third component, oxycarboxylic acid such as p-hydroxybenzoic acid, aromatic dicarboxylic acid such as isophthalic acid and naphthalenedicarboxylic acid, alkylene glycol such as tetramethylene glycol, polyethylene glycol, Polyalkylene glycols such as polypropylene glycol are used.

  As a method for imparting a layer having a porous structure to a polyester film, it is obtained by stretching a resin composition in which an incompatible resin or filler is uniformly dispersed in a polyester resin as a base. In the case of a polyester resin, examples of incompatible resins include polyolefins such as polyethylene and polypropylene, polystyrene, polybutadiene, polyacrylonitrile, and copolymers thereof. Examples of the filler include calcium carbonate, magnesium oxide, titanium oxide, magnesium carbonate, aluminum hydroxide, sodium aluminosilicate, potassium aluminosilicate, clay, mica, talc, barium sulfate, calcium sulfate, and the like. Alternatively, a mixture of two or more types may be used.

  In addition, a stretched porous polyolefin film is preferably used because of excellent print density, image uniformity, ability to prevent ribbon wrinkles, and the like. As the stretched porous polyolefin film, for example, a film mainly composed of an ethylene resin such as high-density polyethylene or low-density polyethylene, a propylene-based resin, or a methyl-1-pentene-based resin is used. Among these, it is preferable to use a propylene resin as a main component from the viewpoint of chemical resistance and cost. As the propylene-based resin, a homopolymer of propylene and a copolymer of propylene and an α-olefin can be used. The propylene resin is preferably used by blending 2 to 25% by mass of a resin having a melting point lower than that of the propylene homopolymer (for example, high density to low density polyethylene).

  A method for providing a layer having a porous structure to a polyolefin resin film is obtained by stretching a resin composition in which inorganic fine powder and / or organic filler is uniformly dispersed in a polyolefin resin as a base. Examples of the inorganic fine powder contained in the polyolefin resin include calcium carbonate, magnesium oxide, titanium oxide, magnesium carbonate, aluminum hydroxide, sodium aluminosilicate, potassium aluminosilicate, clay, mica, talc, barium sulfate and calcium sulfate. However, these may be used as a single species or as a mixture of two or more species.

  When an organic filler is added, it is preferable to select a filler of a different type of resin from the polyolefin resin that is the main component. The organic filler contained in the polyolefin resin is a polymer such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, nylon 6, polystyrene, polymethyl methacrylate, etc., and has a melting point or glass transition temperature higher than the melting point of the polyolefin resin. The polymer which has can be used.

  The compression elastic modulus of the surface layer side thermoplastic resin film is generally in the range of 3 to 90 MPa, preferably 4 to 50 MPa, and more preferably 4 to 40 MPa. If the compression elastic modulus is less than 3 MPa, a dent is likely to occur on the printing screen due to the conveyance roll of the printer, while if the compression elastic modulus exceeds 90 MPa, the compression elastic modulus of the entire receiving sheet increases, Inadequate adhesion is unfavorable because the image uniformity decreases and the ribbon wrinkle transfer prevention property deteriorates.

  Further, as the back side thermoplastic resin film layer, the same thermoplastic resin film as the above-mentioned front side thermoplastic resin film layer is used, preferably a film made of the same resin component as the front side thermoplastic resin film layer is used. Thus, curling of the receiving sheet can be effectively prevented. The lamination method is also carried out using the same adhesive layer as described above.

  Moreover, 10-110 micrometers is preferable, as for the thickness of a thermoplastic resin film, More preferably, it is 20-100 micrometers, Most preferably, it is 30-60 micrometers. If the thickness is less than 10 μm, the thermoplastic resin film is likely to be thermally deformed by printing 3 to 4 times, resulting in poor image uniformity and curling problems. On the other hand, if the thickness exceeds 110 μm, the cost increases. This is economically disadvantageous, and the thickness of the obtained receiving sheet becomes excessive, which leads to a decrease in the number of receiving sheets in the printer, which is not preferable.

In the present invention, the compression elastic modulus of the thermoplastic resin film is preferably larger than the compression elastic modulus of the cushion layer. That is, even if the receiving sheet is subjected to a high pressure by the conveying roll, the pressure can be absorbed by both the thermoplastic resin film and the cushion layer, so that the entire receiving sheet has a smaller dent and a more preferable mode. It is.
In order to control the compression elastic modulus of the entire receiving sheet below a specific value, it is advantageous to increase the thickness of the cushion layer having a low compression elastic modulus. For example, when a paper base material is used as the core material layer, it is a preferable embodiment from the viewpoint of manufacturing cost to increase the thickness of the paper base material which is cheaper than the thermoplastic resin film. When designing the film structure of the actual support, it is necessary to set it appropriately in consideration of the balance of thickness, compression modulus, film price, print quality, and the like.

  Examples of the resin for the thermoplastic resin layer formed on the back side of the core layer include polyolefin resins, polyester resins, acrylic resins, vinyl chloride resins, vinyl acetate resins, cellulose derivative resins, vinyl resins. And various known thermoplastic resins such as polyamide resins and polyurethane resins. Of these, polyolefin resins are preferred because they are inexpensive and effective in improving the water resistance of the receiving sheet. A method for forming the thermoplastic resin layer is not particularly limited, but it is preferably formed by a so-called melt extrusion method in which a thermoplastic resin is melted and extruded from a slit portion of a laminator.

As the resin for the thermoplastic resin layer, the density of the polyolefin resin used is preferably 0.80 to 0.98 g / cm ^{3, and} more preferably 0.85 to 0.95 g / cm ³ . Specific examples of the polyolefin resin include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene, high density polyethylene, polybutene, polymethylpentene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid. Examples include copolymers, ethylene-methacrylic acid copolymers, ethylene-ethyl acrylate copolymers, and so-called ionomer resins obtained by neutralizing ethylene and α- and / or β-unsaturated carboxylic acid copolymers with metal ions. . These polyolefin resins can be used alone or in combination of two or more.

  In addition, the lower the melting point of the polyolefin resin, the lower the laminating temperature at the time of melt-extrusion processing, which suppresses the evaporation of moisture from the core material layer such as a paper substrate due to the temperature rise of the core material layer in contact with the polyolefin resin. In addition, since the thermal contraction of the core layer can be reduced, the curling of the receiving sheet is reduced. Practically, the melting point of the polyolefin resin is preferably from 80 to 160 ° C, more preferably from 95 to 140 ° C.

  As long as the effects of the present invention are not impaired, the polyolefin resin is one or more of various additives such as a heat stabilizer, an antioxidant, an antistatic agent, an ultraviolet absorber, a light stabilizer, inorganic fine particles, and organic fine particles. May be used in combination.

  The thickness of the thermoplastic resin layer is preferably 5 to 100 μm, more preferably 10 to 80 μm. Incidentally, when the thickness of the thermoplastic resin layer is less than 5 μm, sufficient adhesive strength between the core material layer and the thermoplastic resin layer cannot be obtained, while when the thickness of the thermoplastic resin layer exceeds 100 μm, it is uniform. It is difficult to obtain a layer having a sufficient thickness, the thickness of the entire receiving sheet obtained is excessive, and curling control of the receiving sheet is difficult.

(Adhesive layer)
In the present invention, a thermoplastic resin film is laminated on the cushion layer via an adhesive layer. The lamination method is not particularly limited, and known techniques such as wet lamination, dry lamination, melt extrusion lamination, and wax lamination may be used, and melt extrusion lamination and dry lamination methods are preferably used. 3-40 g / m < ² > is preferable and, as for the solid content coating amount of an adhesive bond layer, More preferably, it is the range of 5-30 g / m < ² >.

  For example, in the case of a support in which a thermoplastic resin film is laminated on both sides of a core layer on which a cushion layer is formed, the same type of adhesive layer is applied on both sides so as to have the same solid content coating amount. It is preferable from the viewpoint of curling of the receiving sheet. In order to obtain good adhesion between the core material layer and the thermoplastic resin film and good interlayer strength of the adhesive layer, the adhesive layer is preferably a layer that does not contain voids. Specifically, it is preferable that the adhesive layer does not contain a thermally decomposable foaming agent, unexpanded hollow particles, or already expanded hollow particles.

  Adhesives used in the dry laminating method include polyether and polyester-based polymer resin components mixed with polyisocyanate-based and epoxy-based curing agents, or acrylic and urethane-based resins. Examples thereof include a pressure-sensitive adhesive containing a polyisocyanate-based or epoxy-based curing agent.

As the adhesive used in the melt extrusion laminating method, various thermoplastic resins such as polyolefin resins, polystyrene resins, and polyester resins such as polyethylene terephthalate can be used. Of these, polyolefin resin is preferably used because of its low cost. As the polyolefin resin, preferably the density 0.85~0.98g / cm ^3, more preferably used are those 0.90~0.95g / cm ^3. For example, low density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene and the like are preferably used. Of course, two or more of these polyolefin resins can be used in combination. The lower the melting point of the polyolefin resin, the lower the laminating temperature and the less the heat shrinkage of the thermoplastic resin film. As a result, the curling of the receiving sheet can be reduced.

  The support used in the present invention preferably has a thickness of 100 to 300 μm. Incidentally, if the thickness is less than 100 μm, the mechanical strength thereof is insufficient, the rigidity of the receiving sheet obtained therefrom is small and the repulsive force against deformation is insufficient, and the receiving sheet curl generated at the time of printing is sufficient. There are some cases that cannot be prevented. If the thickness exceeds 300 μm, the thickness of the obtained receiving sheet becomes excessive. Therefore, the capacity of the receiving sheet in the printer is decreased, or the capacity of the printer is increased if the predetermined number of receiving sheets is accommodated. This may cause problems such as making it difficult to make the printer compact.

(Middle layer)
In the receiving sheet of the present invention, an intermediate layer may be provided between the sheet-like support and the receiving layer in order to improve the adhesion between the sheet-like support and the receiving layer and to improve the antistatic property of the receiving sheet. . As the resin used for forming the intermediate layer, various hydrophilic resins and hydrophobic resins can be used. For example, vinyl polymers such as polyvinyl alcohol and polyvinyl pyrrolidone and derivatives thereof, polyacrylamide, polydimethylacrylamide, poly Acrylic acid or salts thereof, polymers containing acrylic groups such as polyacrylic acid esters, polymers containing methacrylic groups such as polymethacrylic acid and polymethacrylic acid esters, polyester resins, polyurethane resins, starches, modified starches, carboxys Resins such as cellulose derivatives such as methylcellulose can be used. Further, known antistatic agents and crosslinking agents can be used alone or in combination with the above resins.

The solid coating amount of the intermediate layer is preferably in the range of 0.2 to 5 g / m ² , more preferably in the range of 0.5 to 3 g / m ² . If the coating amount is less than 0.2 g / m ² , the effect of improving the adhesiveness may not be sufficiently obtained. On the other hand, if it exceeds 5 g / m ² , the coating film strength decreases, or blocking, operability, etc. May get worse.

(Receptive layer)
In the receiving sheet of the present invention, the receiving layer is provided directly on the sheet-like support or on the intermediate layer. A known receiving layer is employed as the receiving layer. As the resin for forming the receiving layer, a resin having a high affinity for the dye transferred from the ink ribbon and a good dye dyeing property is used. Examples of such resins include polyester resins, polycarbonate resins, vinyl chloride copolymers, polyvinyl acetal resins, cellulose derivative resins, acrylic resins, and the like.

  In order to prevent the receiving layer from fusing with the ink ribbon due to heating of the thermal head during printing, one or more of a crosslinking agent, a slipping agent, a release agent and the like are added to the above resin. It is preferable. Moreover, you may add 1 or more types, such as a fluorescent dye, a plasticizer, antioxidant, a ultraviolet absorber, a light stabilizer, a pigment, an antistatic agent, in the said resin as needed. These additives may be applied by mixing with a component for forming the receiving layer, or may be applied on and / or below the receiving layer as a coating layer separate from the receiving layer.

The solid content coating amount of the receiving layer is preferably 1 to 15 g / m ² , more preferably 3 to 10 g / m ² . When the coating amount of the receiving layer is less than 1 g / m ² , the receiving layer cannot completely cover the surface of the support or the intermediate layer, resulting in a decrease in image quality, or the ink sheet and the receiving layer being heated by the thermal head. There may be a fusing problem that causes adhesion. On the other hand, when the solid content coating amount exceeds 15 g / m ² , not only is the effect saturated and uneconomical, but the strength of the receiving layer coating film is insufficient or the thickness of the receiving layer is increased, thereby insulating the support. The effect may not be sufficiently exhibited, and the print density may be lowered.

(Back layer)
You may provide the back surface layer containing an antistatic agent in the back surface (outermost surface on the opposite side to the side in which the receiving layer is provided) of the receiving sheet of this invention. With such a configuration, the receiving sheet can be supplied to the printer, run inside the printer, and smoothly sent out from the printer. As the antistatic agent contained in the back layer, various cationic antistatic agents such as polyethyleneimine, cationic monomer-containing acrylic resin, cation-modified acrylamide resin, and cation-modified starch, or anionic and nonionic antistatic agents are used as appropriate. It may be selected and an appropriate amount thereof may be contained in the back layer. In addition, as a binder for forming the back layer, water-soluble resins such as polyvinyl alcohol, or acrylic resins, epoxy resins, polyester resins, phenol resins, alkyd resins, urethane resins, melamine resins, and reaction cured products of these resins are used. I can do it. Moreover, fillers, such as an inorganic pigment and an organic pigment, can also be mix | blended as a friction coefficient modifier as needed.

The coating amount as the solid content of the backside layer is preferably in a range of from 0.3 to 10 / ^{m 2,} more preferably in the range of 1 to 5 g / ^{m 2.} If the solid content coating amount is less than 0.3 g / m ² , the receiving layer surface may not be sufficiently damaged when the receiving sheets are rubbed with each other, resulting in coating film defects and surface electrical resistance. May increase. If the solid content coating amount exceeds 10 g / m ² , the effect is saturated and uneconomical.

  In the present invention, the cushion layer, the receiving layer, or other coating layer is formed according to a conventional method, and a coating liquid containing necessary components is prepared, and a bar coater, a gravure coater, a comma coater, a blade coater, an air knife coater. It can be formed by coating and drying using a known coater such as a gate roll coater, a die coater, a curtain coater, a lip coater, and a slide bead coater.

  The compression modulus of the entire receiving sheet measured in accordance with JIS K 7220 of the present invention is preferably 50 MPa or less, more preferably 5 to 40 MPa, and still more preferably 10 to 35 MPa. When the compression elastic modulus of the entire receiving sheet exceeds 50 MPa, when printing with a printer, the adhesion between the receiving sheet and the thermal head becomes insufficient, image quality is deteriorated, and ribbon wrinkles are easily transferred to the receiving sheet. The product value may be impaired. On the other hand, if the compression modulus is less than 5 MPa, the rigidity (waist) of the entire receiving sheet becomes insufficient, and the commercial value may be impaired.

  In the present invention, the receiving sheet may be calendered, and the receiving layer surface unevenness can be reduced and smoothed. The calendar treatment may be performed at any stage after the cushion layer coating, the intermediate layer coating, or the receiving layer coating. There are no particular limitations on the calendar device used for calendering, the nip pressure, the number of nips, the surface temperature of the metal roll, etc., but the pressure condition when calendering is preferably 0.5 to 150 MPa. More preferably, it is 1-100 MPa. As temperature conditions, the hollow particles are not destroyed from room temperature, and the Tg temperature of the binder resin for the cushion layer is preferable, preferably 20 to 150 ° C, more preferably 30 to 120 ° C. As the calendar device, for example, a calendar device generally used in the paper industry such as a super calendar, a soft calendar, and a gloss calendar can be appropriately used.

  The thickness of the entire receiving sheet is preferably 100 to 300 μm. When the thickness is less than 100 μm, the mechanical strength is insufficient, and the receiving sheet has insufficient rigidity, and the curling of the receiving sheet that occurs during printing may not be sufficiently prevented. Also, if the thickness exceeds 300 μm, the number of receiving sheets that can be accommodated in the printer is reduced, or if the predetermined number of sheets is to be accommodated, the capacity of the receiving sheet accommodating portion needs to be increased, making it difficult to make the printer compact. It may be.

  The present invention will be described in detail by the following examples, but the scope of the present invention is not limited thereto. In Examples, unless otherwise specified, “%” and “parts” are “mass%” and “parts by mass” of the solid content, except for solvents.

Example 1
(Cushion layer formation)
Art paper (trade name: OK Kanto N, basis weight 104.7 g / m ² , compression modulus: 90 MPa, made by Oji Paper Co., Ltd.) having a thickness of 80 μm was used as the core material layer. ) Was applied to the cushion layer coating solution-1 having the following composition so that the thickness of the cushion layer after drying was 50 μm and dried to form a cushion layer.
Coating liquid for cushion layer-1
Foamed hollow particles: Copolymer system based on acrylonitrile and methacrylate ester Foamed hollow particles (average particle size 3.5 μm, volume hollowness 78%) 55 parts polyvinyl alcohol (trade name: PVA205, manufactured by Kuraray) 10 parts Styrene-butadiene latex (trade name: PT1004, manufactured by Zeon Corporation) 35 parts Water 200 parts

(Formation of sheet-like support)
A stretched porous polyester film containing an inorganic pigment as a thermoplastic resin film (trade name: 40EA3S, thickness: 40 μm, main component: polyethylene terephthalate, compression modulus: both on the front and back surfaces of the core layer on which the cushion layer is formed. 23 MPa, manufactured by Toray Industries, Inc.) was laminated and bonded by a dry laminating method using a polyester adhesive (trade name: a mixture of AD578 and CAT50, manufactured by Toyo Morton Co., Ltd.) to form a sheet-like support. The solid coating amount of the adhesive layer was 8 g / m ² on both the front and back sides of the core layer.

(Formation of receiving sheet)
Next, on the surface of the back surface side thermoplastic resin film (laminated on the back surface side of the core material layer on which the cushion layer is not formed) of the sheet-like support, the back layer coating liquid-1 having the following composition is applied in solid content. The back layer was formed by coating and drying by a bar coating method so that the work amount was 3.0 g / m ² . And on the surface of the sheet-like support surface-side thermoplastic resin film (laminated on the cushion layer forming surface), the intermediate layer coating liquid-1 having the following composition has a solid content coating amount of 2.0 g / m. ^The intermediate layer is formed by coating and drying by a bar coating method so as to be ² , and the solid layer coating amount of the coating solution-1 for receiving layer having the following composition is 5.0 g / m ² on this intermediate layer. It was coated by a gravure coating method and dried. Thereafter, it was heated at 50 ° C. for 5 days to obtain a receiving sheet.

Coating liquid for back layer-1
Polyvinyl acetal resin (trade name: ESREC KX-1, manufactured by Sekisui Chemical Co., Ltd.) 45 parts polyacrylic ester resin (trade name: Jurimer AT613, manufactured by Nippon Pure Chemical Industries) 25 parts nylon resin particles (trade name: MW330, manufactured by Shinto Fine) ) 10 parts zinc stearate (trade name: Z-7-30, manufactured by Chukyo Yushi) 10 parts cationic conductive agent (trade name: Chemistat 9800, manufactured by Sanyo Kasei) 10 parts water / isopropyl alcohol = 2/3 (mass ratio) ) 400 parts of liquid mixture

Intermediate layer coating solution-1
Acrylic resin (trade name: Rikabond SAR 615A, manufactured by Chuo Rika) 50 parts epoxy resin (trade name: Rikabond SAR615B, manufactured by Chuo Rika) 2 parts Cationic conductive resin (trade name: Chemistat 9800, manufactured by Sanyo Chemical) 50 parts Water / Isopropyl alcohol = 5/5 (mass ratio) mixture 400 parts

Receiving layer coating solution-1
Polyester resin (trade name: Byron 200, manufactured by Toyobo) 100 parts silicone oil (trade name: KF393, manufactured by Shin-Etsu Chemical Co., Ltd.) 3 parts polyisocyanate (trade name: Takenate D-140N, manufactured by Takeda Pharmaceutical Co., Ltd.) 5 parts Toluene / Methyl ethyl ketone = 1/1 (mass ratio) mixture 400 parts

Example 2
In the formation of a sheet-like support, a stretched porous polyolefin film containing an inorganic pigment instead of a stretched porous polyester film (trade name: YUPO FPU50, thickness 50 μm, main component: polypropylene, compression as a thermoplastic resin film) A receiving sheet was obtained in the same manner as in Example 1 except that the elastic modulus: 7 MPa, manufactured by YUPO Corporation was used.

Example 3
A receiving sheet was obtained in the same manner as in Example 1 except that the formation of the sheet-like support was changed as follows.
(Formation of sheet-like support)
On the surface on the cushion layer side formed on the core material layer, a stretched porous polyester film containing an inorganic pigment as a surface side thermoplastic resin film (trade name: 40EA3S, thickness 40 μm, main component: polyethylene terephthalate) , Compression elastic modulus: 23 MPa, manufactured by Toray Industries, Inc. was laminated and laminated by a dry laminating method using a polyester adhesive (trade name: a mixture of AD578 and CAT50, manufactured by Toyo Morton Co., Ltd.). The solid content coating amount of the adhesive layer was 8 g / m ² .
Next, a stretched porous polyester film (trade name: 40EA3S, thickness: 40 μm, main component: polyethylene terephthalate) containing an inorganic pigment as a back side thermoplastic resin film on the core layer side (back side) surface. , Compression elastic modulus: 23 MPa, manufactured by Toray Industries, Ltd., using low-density polyethylene (trade name: Mirason 11P, manufactured by Mitsui Polyolefin, compression elastic modulus: 45 MPa) as an adhesive, and solid coating by melt extrusion laminating method The laminate was laminated so that the amount was 10 g / m ² to obtain a sheet-like support.

Example 4
A receiving sheet was obtained in the same manner as in Example 1 except that the formation of the cushion layer was changed as follows.
(Cushion layer formation)
Art paper (trade name: OK Kanto N, basis weight 127.9 g / m ² , compression elastic modulus: 90 MPa, made by Oji Paper Co., Ltd.) having a thickness of 105 μm was used as a core material layer. ) Was applied to the cushion layer coating liquid-2 having the following composition so that the thickness of the cushion layer after drying was 40 μm and dried to form a cushion layer.
Coating liquid for cushion layer-2
Microcapsule type hollow particles (trade name: Nipol MH5055, manufactured by Nippon Zeon,
70 parts polyvinyl alcohol (trade name: PVA205, made by Kuraray) 10 parts styrene-butadiene latex (trade name: PT1004, made by Nippon Zeon) 20 parts water 200 parts

Example 5
A receiving sheet was formed in the same manner as in Example 1 except that the formation of the cushion layer was changed as follows.
(Cushion layer formation)
Art paper (trade name: OK Kanto N, basis weight 84.9 g / m ² , compression elastic modulus: 90 MPa, made by Oji Paper Co., Ltd.) having a thickness of 67 μm was used as the core layer, and one side of the art paper (surface side) ) Was coated with gravure coating solution-3 for cushion layer having the following composition so that the cushion layer thickness after drying was 70 μm, and dried to form a cushion layer.
Coating liquid for cushion layer-3
Expanded hollow particles (trade name: EXPANCEL 551DE20, manufactured by Nippon Philite Co., Ltd.,
35 parts polyvinyl alcohol (trade name: PVA205, manufactured by Kuraray Co., Ltd.) 10 parts styrene-butadiene latex (trade name: PT1004, manufactured by Nippon Zeon) 55 parts water 200 parts

Example 6
A receiving sheet was obtained in the same manner as in Example 1 except that the formation of the cushion layer was changed as follows.
(Cushion layer formation)
Art paper (trade name: OK Kanto N, basis weight 104.7 g / m ² , compression modulus: 90 MPa, made by Oji Paper Co., Ltd.) having a thickness of 80 μm was used as the core material layer. ) Was applied to the cushion layer coating solution-4 having the following composition so that the thickness of the cushion layer after drying was 50 μm and dried to form a cushion layer.
Coating liquid for cushion layer-4
Foamed hollow particles: Copolymer system based on acrylonitrile and methacrylic acid ester Foamed hollow particles (average particle size 8.0 μm, volume hollowness 75%) 55 parts Polyvinyl alcohol (trade name: PVA205, manufactured by Kuraray) 10 parts Styrene-butadiene latex (trade name: PT1004, manufactured by Zeon Corporation) 35 parts Water 200 parts

Example 7
A receiving sheet was obtained in the same manner as in Example 1 except that the formation of the sheet-like support was changed as follows.
(Formation of sheet-like support)
On the surface on the cushion layer side formed on the core material layer, a stretched porous polyester film containing an inorganic pigment as a surface side thermoplastic resin film (trade name: 40EA3S, thickness 40 μm, main component: polyethylene terephthalate) , Compression elastic modulus: 23 MPa, manufactured by Toray Industries, Inc. was laminated and laminated by a dry laminating method using a polyester adhesive (trade name: a mixture of AD578 and CAT50, manufactured by Toyo Morton Co., Ltd.). The solid content coating amount of the adhesive layer was 8 g / m ² .
Further, a thermoplastic resin layer-1 having the following components was laminated on the surface of the core material layer side (back surface side) by a melt extrusion method so that the thickness was 60 μm, thereby forming a sheet-like support.
Thermoplastic resin layer-1
Low density polyethylene (trade name: Mirason 11P, made by Mitsui Polyolefin,
Compression modulus: 45 MPa) 100 parts Titanium oxide (manufactured by Sakai Chemical) 20 parts

Example 8
A receiving sheet was obtained in the same manner as in Example 1 except that the formation of the cushion layer and the formation of the sheet-like support were changed as follows.
(Cushion layer formation)
Art paper (trade name: OK Kanto N, basis weight 84.9 g / m ² , compression elastic modulus: 90 MPa, made by Oji Paper Co., Ltd.) having a thickness of 67 μm was used as the core layer, and one side of the art paper (surface side) ) Was applied to the cushion layer coating solution-1 used in Example 1 so that the thickness of the cushion layer after drying was 50 μm, and dried to form a cushion layer.
(Formation of sheet-like support)
On the cushion layer side surface formed on the core material layer, a stretched porous polyolefin film containing an inorganic pigment as a surface side thermoplastic resin film (trade name: YUPO FPU50, thickness 50 μm, main component: polypropylene) , Compression elastic modulus: 7 MPa, manufactured by Yupo Corporation) was laminated and laminated by a dry laminating method using a polyester adhesive (trade name: a mixture of AD578 and CAT50, manufactured by Toyo Morton Co., Ltd.). The solid content coating amount of the adhesive layer was 8 g / m ² .
Further, the thermoplastic resin layer-1 used in Example 7 was laminated on the surface of the core layer side (back surface side) by a melt extrusion method so that the thickness became 70 μm, and a sheet-like support was obtained. Formed.

Example 9
A receiving sheet was obtained in the same manner as in Example 1 except that the formation of the cushion layer and the formation of the sheet-like support were changed as follows.
(Cushion layer formation)
Art paper (trade name: OK Kanto N, basis weight 84.9 g / m ² , compression elastic modulus: 90 MPa, made by Oji Paper Co., Ltd.) having a thickness of 67 μm was used as the core layer, and one side of the art paper (surface side) The cushion layer coating solution-1 used in Example 1 was gravure-coated so that the thickness of the cushion layer after drying was 50 μm, and dried to form a cushion layer.
(Formation of sheet-like support)
On the cushion layer side surface formed on the core material layer, a stretched porous polyester film containing an inorganic pigment as a thermoplastic resin film (trade name: 40EA3S, thickness: 40 μm, main component: polyethylene terephthalate, compression elasticity A low-density polyethylene (trade name: Mirason 11P, made by Mitsui Polyolefin, compression elastic modulus: 45 MPa) is used as the adhesive layer, and the solid content coating amount is 10 g / m ^2. Were laminated and laminated by a melt extrusion lamination method.
Further, the thermoplastic resin layer-1 used in Example 7 was laminated on the surface of the core material layer side (rear surface side) by a melt extrusion method so as to have a thickness of 65 μm. Formed.

Comparative Example 1
Art paper (trade name: OK Kanto N, basis weight 127.9 g / m ² , compression elastic modulus: 90 MPa, made by Oji Paper) was used as the core layer, except that the cushion layer was not formed. Obtained a receiving sheet in the same manner as in Example 1.

Comparative Example 2
A receiving sheet was obtained in the same manner as in Example 1 except that the formation of the sheet-like support was changed as follows.
(Formation of sheet-like support)
Art paper (trade name: OK Kanto N, basis weight 127.9 g / m ² , compression elastic modulus: 90 MPa, made by Oji Paper Co., Ltd.) having a thickness of 105 μm was used as a core material layer. ), A stretched porous polyester film (trade name: 40EA3S, thickness: 40 μm, main component: polyethylene terephthalate, compressive elastic modulus: 23 MPa, manufactured by Toray) containing an inorganic pigment as a surface-side thermoplastic resin film has the following composition: The adhesive layer coating solution-1 was used to laminate and laminate by a dry laminating method so that the solid content coating amount was 20 g / m ² .
Next, a stretched porous polyester film (trade name: 40EA3S, thickness: 40 μm, main component: polyethylene terephthalate) containing an inorganic pigment as a back side thermoplastic resin film on the core layer side (back side) surface. , Compression elastic modulus: 23 MPa, manufactured by Toray Industries, Inc., using a polyester-based adhesive (trade name: a mixture of AD578 and CAT50, manufactured by Toyo Morton Co., Ltd.), the solid content coating amount is 8 g / m. ^{Then, a} sheet-like support was obtained by laminating and laminating by a dry laminating method so as to be ² .
Coating liquid for adhesive layer-1
Polyester resin (trade name: AD578, manufactured by Toyo Morton Co., Ltd.) 80 parts isocyanate (trade name: CAT50, manufactured by Toyo Morton Co., Ltd.) 20 parts Pre-expanded hollow particles: Copolymer system based on acrylonitrile and methacrylic ester Foamed hollow particles (Average particle size 3.5 μm, volume hollowness 78%) 33 parts ethyl acetate 300 parts

Evaluation Method The receiving sheets obtained in the above Examples and Comparative Examples were measured and evaluated by the following methods.

(1) Compressive elastic modulus The compressive elastic modulus of the receiving sheet was evaluated according to JIS K 7220 "Compression test method for rigid foam plastic". However, the thickness of the test receiving sheet was defined as the height (thickness) of the test piece. The compression speed was 20 μm / min.

(2) Ribbon wrinkle transfer prevention property An ink layer surface of each color using an ink ribbon provided with an ink layer containing a sublimation dye of each of three colors of yellow, magenta, and cyan together with a binder on a polyester film having a thickness of 6 μm. Were sequentially brought into contact with the receiving sheet, and 10 solid images of three colors were continuously printed using a commercially available thermal transfer video printer (trade name: DR100, manufactured by Sony Corporation).
◎ if there is no ribbon wrinkle on the marking screen, ○ if there is almost no ribbon wrinkle and no problem in practical use, △ if there is a lot of ribbon wrinkle, and x if ribbon wrinkle is severe Visual evaluation was made. For practical use, a level of ○ or higher is necessary.

(3) Recess of Receptor Sheet A commercially available thermal transfer video printer (trade name: M1, manufactured by Sony Corporation) was modified to produce a test machine having a high nip pressure of the transport roll. As a result of measuring and evaluating the nip pressure of this tester using a pressure test film (trade name: Prescale, manufactured by Fuji Photo Film Co., Ltd.), it was 200 kg / cm ² . Using this testing machine, the dent of the receiving sheet by the transport roll was visually evaluated.
The case where there was no dent was marked with ◎, the case where there was a slight dent but no problem in practical use was marked with ○, and the case where there was a significant dent and practically problematic was marked with ×.

(4) Print quality (print density, image uniformity)
Using an ink ribbon provided with an ink layer containing sublimation dyes of yellow, magenta, and cyan, together with a binder, on a polyester film substrate having a thickness of 6 μm, the surface of the ink layer of each color is sequentially tested. The image is thermally transferred to the receiving sheet by using a commercially available thermal transfer video printer (trade name: DR100, manufactured by Sony Corporation) and controlled heating with a thermal head in steps. Halftone single color and color overlay images were printed.
Using the Macbeth reflection densitometer (trade name: RD-914, manufactured by Kollmorgen), the density of the high gradation portion corresponding to the 16th step from the lowest applied energy is measured for the recorded image transferred on the receiving sheet. The print density was used. If the print density is 2.0 or more, there is no practical problem.

Further, visual evaluation was performed with respect to the image uniformity of the gradation recording portion corresponding to an optical density (black) of 0.5 with respect to density unevenness and the presence or absence of white spots.
Excellent evaluation results were marked with ◎, normal results with ◯, and poor image uniformity.
The results are shown in Table 1.

(5) Adhesive strength of receiving sheet support As a sample for evaluating adhesive strength, a strip-shaped receiving sheet having a width of 18 mm and a length of 170 mm is cut and prepared, and the back surface of the receiving sheet sample is used with a double-sided adhesive tape. The layer side was fixed on a glass plate. Next, a commercially available adhesive tape (trade name: cello tape (R), manufactured by Nichiban Co., Ltd., tape width: 18 mm) is adhered to the receiving layer surface of the fixed strip-shaped receiving sheet sample, and the temperature is 5 ° C. and the relative humidity is 10%. Under the environment, the adhesive tape was peeled 180 degrees, and the peeled state of the laminated portion of the receiving sheet support was visually evaluated.
The case where peeling was not observed in the laminated portion of the receiving sheet support or the like was rated as “◯”, and the case where the laminated portion of the receiving sheet support was peeled was marked as “X”.

  The thermal transfer receiving sheet of the present invention has good adhesive strength at the laminated portion of the support, has an appropriate compressive elastic modulus as a whole, there is no dent of the receiving sheet during printing, and ribbon wrinkle transfer on the printing screen It is a high-sensitivity, high-quality thermal transfer receiving sheet with high print density and excellent image uniformity, and is particularly useful as a receiving sheet for dye thermal transfer printers and is practically excellent. .

Claims (9)

  Thermal transfer having a sheet-like support in which a cushion layer containing a hollow particle and a thermoplastic resin film layer are sequentially laminated on at least one surface of a core material layer, and an image receiving layer formed on the thermoplastic resin film layer The thermal transfer receiving sheet, wherein the thermoplastic resin film layer is laminated on the cushion layer via an adhesive layer.   The thermal transfer receiving sheet according to claim 1, wherein the hollow particles have an average particle diameter of 0.4 to 20 μm.   The thermal transfer receiving sheet according to claim 1 or 2, wherein the hollow particles have a volume hollow ratio of 50 to 97%.   The thermal transfer receiving sheet according to any one of claims 1 to 3, wherein a thickness of the cushion layer is 10 to 100 µm, and a thickness of the cushion layer is three times or more an average particle diameter of the hollow particles.   The thermal transfer receiving sheet according to any one of claims 1 to 4, wherein the sheet-like support has a thermoplastic resin layer on the other surface on which the cushion layer of the core material layer is not laminated.   The said sheet-like support body has the thermoplastic resin film layer laminated | stacked through the adhesive bond layer on the other surface where the cushion layer of the core material layer is not laminated | stacked. Thermal transfer receiving sheet.   The thermal transfer receiving sheet according to any one of claims 1 to 6, wherein the thermoplastic resin film layer is a stretched porous polyolefin resin film or a stretched porous polyester resin film.   The thermal transfer receiving sheet according to any one of claims 1 to 7, wherein the core material layer is a paper base material mainly composed of cellulose pulp. The thermal transfer receiving sheet according to any one of claims 1 to 8, wherein the entire thermal transfer receiving sheet has a compression modulus measured according to JIS K7220 of 50 MPa or less.