JP2018030342A - Sublimation type inkjet printing transfer paper and method for producing the same - Google Patents

Abstract

A sublimation type ink jet printing transfer paper that can suppress the strike-through of ink during transfer printing and is less likely to wrinkle even when used in the form of a sheet, and a method for producing the same. A sublimation-type textile ink-receiving layer formed on a substrate is inorganic fine particles having a tabular crystal structure, has a median diameter d50 in the range of 0.4 to 2.3 μm, and has an aspect ratio of It contains inorganic fine particles of 5 or more, silica particles, and sodium carboxymethylcellulose. The mass ratio of the inorganic fine particles having a tabular crystal structure and the silica particles is 15/85 to 90/10, and the amount of sodium carboxymethylcellulose is 10 to 100 parts per 100 parts by mass in total of the inorganic fine particles having a tabular crystal structure and the silica particles. It is contained at a rate of 80 parts by mass. 100 to 10000 seconds. [Selection figure] None

Description

  The present disclosure relates to a sublimation ink jet printing transfer paper and a method for producing the same. More specifically, the present disclosure relates to a sublimation type ink jet printing transfer paper used for printing using a sublimation type printing ink by an ink jet recording method in a sublimation type printing transfer method for transferring a printed image to a fabric, and a method for producing the same. About.

  The transfer printing method includes a melt transfer printing method using an ink composed of a heat-softening fixing agent such as wax and resin and a pigment, and a rubber using a plastisol ink composed of a powder such as polyvinyl chloride, a plasticizer and a pigment. Examples thereof include a printing type transfer printing method and a sublimation type printing transfer method using a heat sublimation dye.

  Conventionally, various printing plates and printing machines corresponding to the printing plates have been required for the formation of the transfer textile sheet. Recently, however, a transfer textile sheet for an ink jet recording method corresponding to a small lot has been proposed. Demand for sublimation printing transfer methods for lots is increasing.

  The sublimation printing transfer method mainly includes a thermal drum type transfer press method in which the unwound transfer printing sheet is heated by a thermal drum and brought into close contact with the transfer object and pressed, or cut transfer printing is performed. There is a flat table type transfer press system in which a sheet is heated with a flat plate and brought into close contact with an object to be transferred. The sublimation printing transfer method has the advantage that it can print a sharp pattern that is difficult to obtain by other transfer methods without impairing the texture of the printed material. In recent years, the demand for sublimation printing transfer methods for small lots has been increasing, and after printing transfer paper is cut and formed into sheets, it can also be transferred and printed on a transfer object using a flat table type transfer press system. The demand for paper was desired.

  In Patent Documents 1 to 3, as the sublimation type ink jet printing transfer paper for the ink jet recording method, on the base material, inorganic fine particles having a flat crystal structure, pigments such as silica, carboxymethyl cellulose sodium, polyvinyl alcohol, and the like are bound. A sublimation type ink jet printing transfer paper provided with an ink receiving layer containing an agent or the like is disclosed.

  Patent Document 4 discloses a sublimation ink jet printing transfer paper in which inorganic particles such as porous inorganic fine particles are contained in the ink receiving layer in order to improve the retention of the sublimation printing ink in the ink receiving layer. Has been.

Japanese Patent No. 5778366 JP 2003-276309 A Japanese Patent Laid-Open No. 2002-292995 JP 2003-313786 A

  However, in the conventional sublimation type ink jet printing transfer papers described in Patent Documents 1 to 4, the ink passes through the coating layer as a result of emphasizing the absorption and drying properties of the sublimation type printing ink at the time of ink jet printing. When sublimation printing ink reaches the layer and is transferred to the transfer object, the sublimation type printing ink penetrates to the back side different from the ink receiving layer of the transfer paper and adheres to the transfer press machine and becomes contaminated. There is a problem of end. In addition, the conventional sublimation type ink jet printing transfer paper is assumed to be used for transfer printing by the thermal drum type transfer press system, and the flat table type transfer press system used in the form of a sheet tends to wrinkle the paper. There is also a problem that transfer printing cannot be performed.

  Therefore, an object of the present invention is to provide a sublimation type ink jet printing transfer paper which can suppress the back-through of ink at the time of transfer printing and hardly wrinkle even when used in a sheet shape, and a method for producing the same.

The sublimation type ink jet printing transfer paper according to the present invention has a sublimation type printing ink receiving layer formed on a substrate, and the sublimation type printing ink receiving layer contains a water-soluble resin, fine particles A, and fine particles B. The fine particle A is an inorganic fine particle having a tabular crystal structure and having a median diameter d50 in the range of 0.4 to 2.3 μm and an aspect ratio of 5 or more. The fine particles B are silica particles, and the ratio of the fine particles A and the fine particles B (fine particles A / fine particles B) is 15/85 to 90/10 in terms of mass ratio, and is water-soluble. The resin is sodium carboxymethylcellulose. In the ink-receiving layer coating material, sodium carboxymethylcellulose is contained at a ratio of 10 to 80 parts by mass with respect to 100 parts by mass of the fine particles A and B, and the coating amount (dry) of the ink-receiving layer coating is 3 A sublimation type ink jet printing transfer paper, which has a gas permeability of 100 to 10,000 seconds according to JIS P 8117: 2009, which is ˜13 g / m ² .

  Further, the method for producing a sublimation type ink jet printing transfer paper according to the present invention comprises a step of preparing an ink receiving layer coating containing a water-soluble resin, fine particles A and fine particles B, and an ink receiving layer coating on a substrate. And a step of forming a sublimation type printing ink receiving layer on the substrate. The fine particles A are inorganic fine particles having a flat crystal structure, have a median diameter d50 in the range of 0.4 to 2.3 μm, and have an aspect ratio of 5 to 30, and the fine particles B are The ratio of the fine particles A and the fine particles B (fine particles A / fine particles B) is 15/85 to 90/10 in mass ratio. The water-soluble resin is carboxymethylcellulose sodium, and the carboxymethylcellulose sodium is contained in the ink-receiving layer coating at a ratio of 10 to 80 parts by mass with respect to 100 parts by mass of the fine particles A and B in total.

  According to the present invention, it is possible to provide a sublimation type ink jet printing transfer paper which can suppress the ink see-through at the time of transfer printing and hardly wrinkle even when used in a sheet shape, and a method for producing the same.

  Hereinafter, embodiments will be described in detail. However, more detailed explanation than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  In addition, the inventors provide the following description for those skilled in the art to fully understand the present disclosure, and are not intended to limit the claimed subject matter.

  The sublimation type ink jet printing transfer paper in the present disclosure has a sublimation type printing ink receiving layer formed on a substrate, and the sublimation type printing ink receiving layer includes a water-soluble resin, fine particles A, and fine particles B. Ink-receiving layer paint containing

  The base material used for the sublimation type ink jet printing transfer paper is a base material on which a sublimation type printing ink receiving layer can be provided, and the material is not particularly limited as long as excessive heat shrinkage does not occur due to heating during heat transfer. For example, non-woven fabrics, fabrics, resin-coated papers, synthetic papers, and the like can be mentioned in addition to papers mainly composed of wood pulp and porous resin films made of thermoplastic resins containing inorganic fine particles.

  In the present disclosure, “main component” refers to constituting 50% by mass or more of the total amount of components.

  The base material on which the effect of the sublimation ink jet printing transfer paper appears remarkably is a porous material in which the sublimation printing ink is easily sublimated by heating the back surface of the sublimation ink jet printing transfer paper. Specifically, paper, non-woven fabric, fabric and the like mainly composed of wood pulp.

  As a base material, it is preferable to use paper mainly composed of wood pulp, and it is particularly preferable to use kraft paper. Kraft paper is excellent in dimensional stability, and unlike the film, it can be recycled and has the characteristics of excellent absorption and drying properties of sublimation type printing ink.

  Kraft paper is taken as an example of the base material that is suitably used, and will be described below. Kraft paper suitably used for sublimation inkjet printing transfer paper satisfies the quality of conventional wrapping paper as defined in JIS P 3401, and is dried with a Yankee dryer in the category of kraft paper. It is processed glossy paper (yankee paper). Since these are excellent in dimensional stability, excellent image reproducibility can be achieved.

The substrate used in the sublimation type ink jet printing transfer paper preferably has a basis weight of 50~140g / ^{m 2,} and more preferably 55~110g / ^{m 2.} If the basis weight is less than 50 g / m ² , in the case of current ink jet printers, due to its performance, cocking (rippling) occurs due to ink soaking into the kraft paper at the normal ink amount, and the reverse during transfer heating. The kraft paper shrinks, the adhesiveness with the fabric as the transfer object is lowered, and the quality of the transferred image tends to be lowered. In addition, paper breakage is likely to occur due to a decrease in tensile strength and tear strength. When the basis weight exceeds 140 g / m ² , heat transfer to the transfer object is deteriorated at the time of heat transfer of the sublimation printing ink, and the transfer efficiency tends to be lowered.

  Further, the coating surface of the ink-receiving layer coating material on the base material preferably has a Beck smoothness of 30 to 400 seconds, more preferably 50 to 300 seconds based on JIS P 8119. If the Beck smoothness is less than 30 seconds, it is probably caused by unevenness on the surface of the substrate, but the difference between the portion where the sublimation type printing ink receiving layer penetrates the substrate and the portion where it does not penetrate easily becomes apparent. Coating defects tend to occur. In addition, although the absorption and drying properties of the sublimation printing ink at the time of printing increase, the image reproducibility deteriorates, and the image reproducibility and transfer efficiency at the time of transfer of the sublimation printing ink to the transfer object decrease. There is a tendency to. These tendencies can be improved by increasing the smoothness. Especially, glossy paper has a high degree of smoothness on the back side (the surface on the wire side of the paper machine = Yankee surface) that has been dried with a Yankee dryer. By coating on the surface, there is little risk of coating defects, excellent image reproducibility with sublimation type printing ink and prevention of back-through, and image reproduction during transfer printing to the transfer object Transfer efficiency to the transfer object, such as transferability, transfer image resolution, transfer image density level, and uniformity thereof. At the same time, since the surface side of the base material is not flattened, it has an effect of improving the heat sublimation property of the sublimation printing ink when the sublimation printing ink is heated and transferred in close contact with a heating dryer. However, when the Beck smoothness exceeds 400 seconds, the adhesion between the sublimation printing ink receiving layer and the substrate is lowered, and the thin portion of the ink receiving layer tends to easily induce coating defects. In addition, unevenness occurs in the formation of the sublimation printing ink receiving layer, and the image reproducibility tends to decrease.

  Kraft paper that can be used for sublimation type ink jet textile transfer paper is composed of raw materials used in the so-called papermaking field. The pulp to be used is not particularly limited. For example, chemical pulp such as softwood unbleached kraft pulp (NUKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), and hardwood bleached kraft pulp (LBKP) A thermomechanical pulp (TMP), a chemithermomechanical pulp (CTMP), a refiner mechanical pulp (RMP), a refiner ground pulp (RGP), a chemiground pulp (CGP), a thermoground pulp (TGP), a groundwood pulp (GP), Mechanical pulp such as Stone Grand Pulp (SGP) and Pressurized Stone Grand Pulp (PGW); Chemical pulp such as Deinking Pulp (DIP) and West Pulp (WP) and waste paper pulp including mechanical pulp, etc. One or more from the inside It can be used with-option. Of these, hardwood kraft pulp, and further suitable use of hardwood bleached kraft pulp and softwood bleached kraft pulp are used in combination with paper quality strength, substrate surface flatness, sublimation ink-jet printing transfer paper of sublimation printing ink. This is preferable from the viewpoint of checking the quality of the printed image.

  In the base material in the present disclosure, various starches such as oxidized starch, acetylated starch, esterified starch and etherified starch, paper strength enhancers, internal sizing agents such as alkyl ketene dimers, addition of yield improvers, etc. Chemicals and fillers such as titanium oxide, clay, talc, and calcium carbonate can be blended as long as they can be adjusted. In addition, various starches such as oxidized starch, acetylated starch, esterified starch, and etherified starch, a paper strength enhancer, and an external sizing agent such as alkyl ketene dimer can be applied to the surface layer of the substrate. .

  As a base material in this embodiment, the time (referred to as EST size) until the ultrasonic transmission intensity of the initial water absorption characteristic reaches 100%, measured with a surface / size tester (EST12, manufactured by emtec) is 0.1. Those having a duration of ˜3.0 seconds are preferred, and those having an EST size of 0.5 to 2.0 seconds are more preferred. The time (EST size) until the ultrasonic transmission intensity of the initial water absorption characteristics measured with the surface / size tester reaches 100% is a parameter representing the permeability of the ink-receiving layer paint to the substrate immediately after coating. is there. When the EST sizing degree is less than 0.1 seconds, the ink-receiving layer coating material excessively penetrates into the substrate, and fine defects are generated in the ink-receiving layer, which may slightly reduce the image reproducibility. On the other hand, when the EST sizing degree exceeds 3.0 seconds, the ink-receptive layer paint hardly penetrates into the base material, and as a result, the adhesion between the ink-receptive layer and the base material is deteriorated, resulting in a slight decrease in image reproducibility. there is a possibility. For these reasons, it is preferable to use a substrate having an EST sizing degree in the range of 0.1 to 3.0 seconds in order to improve image reproducibility.

Substrate in the present disclosure is preferably 10 seconds Cobb water absorption conforming to JIS P 8140 is 5 to 20 g / ^{m 2,} and more preferably 10~16g / ^{m 2.} If the 10-second Cobb water absorption is less than 5 g / m ² , the adhesion between the sublimation type printing ink receiving layer and the substrate is deteriorated, so that the image reproducibility may be slightly lowered. When the water absorption of the Cobb for 10 seconds exceeds 20 g / m ² , the ink receiving layer paint easily penetrates into the substrate, and the ink receiving layer becomes too thin at the part where the ink has been partially penetrated. Defects may occur and image reproducibility may be slightly reduced. For these reasons, it is preferable to use a substrate having a 10 second Cobb water absorption within a range of 5 to ²⁰ g / m ² in order to improve image reproducibility. The 10-second Cobb water absorption is a parameter that represents the permeability of the ink-receiving layer coating material as seen in a longer time than the time until the ultrasonic transmission intensity of the initial water absorption characteristics described above reaches 100%. By using a base material that satisfies the conditions of the ultrasonic transmission intensity of the initial water absorption characteristics described above and has a water absorption rate of 10 seconds in the above range, it is possible to more reliably form a stable ink receiving layer coating film. Can do.

  In the sublimation type ink jet printing transfer paper according to the present embodiment, the sublimation type printing ink receiving layer formed on the substrate is composed of an ink receiving layer coating material containing a water-soluble resin, fine particles A, and fine particles B.

(Water-soluble resin)
The water-soluble resin is mainly used as a binder in ordinary paints, but in the present disclosure, it is also sodium carboxymethyl cellulose (hereinafter referred to as CMC) because it has the property of capturing and absorbing sublimation printing ink. However, compounds other than CMC can also be used. Examples of compounds other than CMC include starch derivatives such as starch, oxidized starch, cationized starch, etherified starch, and phosphate esterified starch, cellulose derivatives such as hydroxymethylcellulose, hydroxyethylcellulose, and cellulose sulfate, and various saponification degrees. Polyvinyl alcohol (hereinafter referred to as PVA), various PVA derivatives such as silanol-modified products, carboxylated products, and cationized products, water-soluble natural polymer compounds such as casein, gelatin, modified gelatin, and soy protein, polyvinylpyrrolidone, sodium polyacrylate And water-soluble synthetic polymer compounds such as sodium styrene-maleic anhydride copolymer sodium salt and sodium polystyrene sulfonate, and one or more of them can be selected and used in combination with CMC.

  At least CMC is used as a water-soluble resin in order to provide excellent image reproducibility and anti-through-through prevention property by the sublimation type printing ink receiving layer, but it is also considered that the degree of polymerization or molecular weight of CMC affects these performances. Therefore, it is preferable to use CMC having a predetermined polymerization degree and molecular weight and to control the temperature at the time of applying the ink receiving layer coating material.

  As CMC used suitably, CMC with a polymerization degree of 30-180 and a weight average molecular weight of 6600-40000 is mentioned. CMC having a degree of polymerization of 30 to 180 and a weight average molecular weight of 6600 to 40,000 is easy to form a sublimation printing ink receiving layer with few coating defects from the viewpoint of viscosity and workability. Can be made easier. If the degree of polymerization is less than 30 and the weight average molecular weight is less than 6600, the viscosity of CMC is low, leading to a phenomenon that the coating film of the ink receiving layer is torn off, and it is considered that defects are likely to occur in the continuous film. . If the degree of polymerization is greater than 180 and the weight average molecular weight is greater than 40000, workability in the coating process may be reduced. For example, if the viscosity of CMC is too high and coating is difficult, or if the solid content is decreased to reduce the viscosity, a drying load is applied, and if the viscosity is lowered for a long time at a high temperature, May adversely affect formation.

  For example, CMC having an etherification degree of about 0.5 to 1.0 can be used.

  Specific examples of CMC include, for example, Serogen 5A, Serogen 7A (both trade names, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., “Serogen” is a registered trademark), FINNFIX2, FINNFIX5 (both trade names, manufactured by CP Kelco, “FINFIX” is a registered trademark).

  In addition to CMC, PVA can also be used for the sublimation type ink jet textile transfer paper. Among PVA, PVA having a saponification degree of about 87 to 99 mol%, more preferably about 98 to 99 mol%, and a polymerization degree of about 1700 or less, further about 1000 or less, particularly 500 or less is compatible with CMC. The sublimation type printing ink is effectively left in the sublimation type printing ink receiving layer. In addition, such PVA also has an effect of improving the dispersibility of fine particles A (inorganic fine particles having a flat crystal structure) described later.

  Specific examples of PVA include, for example, Kuraray Poval PVA110, Kuraray Poval PVA105 (both trade names, manufactured by Kuraray Co., Ltd.) and the like.

  When PVA is used together with CMC as the water-soluble resin, the amount of PVA in the ink-receiving layer coating is preferably 15 parts by mass or less, more preferably 8 parts by mass or less with respect to 100 parts by mass of the fine particles A in solid content. . By adjusting the amount of PVA within this range, it is possible to achieve better absorption and drying properties of the sublimation printing ink. If the amount of PVA exceeds 15 parts by mass, there is a sign that the formation of a film by PVA prevents the formation of a film by CMC, which may induce coating defects.

  Furthermore, when an ink-receiving layer coating material is prepared using CMC and PVA in combination, the effect of reducing coating defects can be obtained by adding PVA before CMC to fine particles A. This is preferable. The reason for this is not clear, but the more the amount of free PVA, the more likely the inhibition of film formation by CMC occurs. By contacting PVA with fine particles A prior to CMC, fine particles A It is considered that the amount of PVA trapped in the film increases, and the inhibition of film formation by CMC is reduced.

(Fine particle A)
The fine particles A contained in the ink receiving layer coating are inorganic fine particles having a flat crystal structure.

  The inorganic fine particles having a flat crystal structure have a role of forming an ink barrier layer in the sublimation type printing ink receiving layer, suppressing the penetration of the ink into the substrate, and holding the ink in the ink receiving layer. As the inorganic fine particles having a flat crystal structure, for example, hydrophilic fine particles, secondary clays and delaminated clays are suitably used, and have a range of 0.4 to 2.3 μm, preferably 0.4 to 1.4 μm. By using inorganic fine particles having a median diameter d50 in the range and an aspect ratio of 5 to 30, preferably 8 to 20, an ink barrier layer made of inorganic fine particles can be formed without hindering the formation of a continuous film of CMC. it can. With inorganic fine particles having a median diameter of less than 0.4 μm and an aspect ratio of less than 5, a sufficient ink barrier layer cannot be formed, and ink breakthrough tends to occur during transfer. In the case of inorganic fine particles having a median diameter exceeding 2.3 μm, sedimentation of the fine particles in the ink-receiving layer paint easily occurs, handling such as flowability of the paint is lowered, and quality stability is hindered. Inorganic fine particles having an aspect ratio of more than 30 have a barrier property that is too high and lowers the ink drying property.

  The particle size of the fine particles A was determined by using a Coulter Counter particle size distribution analyzer (TA-II type, manufactured by COULTER ELECTRONICS INS) for a solution in which a small amount of sample was added to a methanol solution and dispersed for 3 minutes with an ultrasonic disperser. ) And the volume average particle diameter measured using a 50 μm aperture.

(Fine particle B)
The fine particles B contained in the ink receiving layer coating material are silica particles.

Silica particles have a role of improving ink absorbability. The silica particles are preferably porous synthetic amorphous silica particles having a large pore volume. Such synthetic amorphous silica particles are porous, amorphous fine particles in which a three-dimensional structure of SiO ₂ is formed by silicic acid gelation, and have a pore diameter of about 10 to 2000 angstroms. In particular, by using such synthetic amorphous silica particles, the absorbability of the sublimation printing ink of the transfer object is improved, and the transfer rate of the sublimation printing ink to the transfer object is also improved. The upper image can be made clearer.

  As the synthetic amorphous silica particles, commercially available particles can be suitably used. For example, Mizukacil P-526, Mizukacil P-801, Mizukacil NP-8, Mizukacil P-802, Mizukacil P-802Y, Mizukacil C-212 Mizukacil P-73, Mizukacil P-78A, Mizukacil P-78F, Mizukacil P-87, Mizukacil P-705, Mizukacil P-707, Mizukacil P-707D, Mizukacil P-709, Mizukacil C-402, Mizukacil C-484 (Made by Mizusawa Chemical Co., Ltd.), Toxeal U, Toxeal UR, Toxeal GU, Toxeal AL-1, Toxeal GU-N, Toxeal N, Toxeal NR, Toxeal PR, Sorex, Fineseal E-50, Fine Seal T-32, Fine seal X-30, Fine Seal X-37, Fine Seal X-37B, Fine Seal X-45, Fine Seal X-60, Fine Seal X-70, Fine Seal RX-70, Fine Seal A, Fine Seal B (OSC Japan Ltd.) ), Sipernato, Carplex FPS-101, Carplex CS-7, Carplex 80, Carplex 80D, Carplex 67, Carplex # 80, Carplex BS304F (above, manufactured by DSL Japan Co., Ltd.), Siricia 350, Silysia 445 (above, manufactured by Fuji Silysia Chemical Co., Ltd.), nip gel AY-200, nip gel AY-6A3, nip gel AZ-200, nip gel AZ-6A0, nip gel BY-200, nip gel CX-200, nip Le CY-200, Nipsil E-150 J, Nipsil E-220A, Nipsil E-200A (above, Tosoh Ltd. Silica Co.), and the like.

  The average particle diameter of the silica particles is preferably 2 to 20 μm, more preferably 4 to 16 μm. By using fine silica particles having an average particle diameter of 2 to 20 μm as the fine particles B, higher quality color reproducibility and image reproducibility can be obtained.

  Further, it is preferable to use a combination of at least two types of silica particles having different average particle diameters. In particular, a combination of silica particles having an average particle diameter of 2 to 5 μm and silica particles having an average particle diameter exceeding 5 μm It is preferable to use as B. Thus, the combined use of silica particles having different average particle diameters can further improve the drying property of the sublimation printing ink.

  When at least two types of silica particles having different average particle diameters are used in combination, the ratio of silica particles having an average particle diameter of 2 to 5 μm and silica particles having an average particle diameter exceeding 5 μm (average particle diameter of 2 to 5 μm The silica particles / silica particles having an average particle diameter exceeding 5 μm is not particularly limited, but is preferably 10/90 to 50/50 in terms of the mass ratio of the solid content. By setting such a ratio, a better drying property of sublimation printing ink, image reproducibility on sublimation ink jet printing transfer paper, image reproducibility on transferred material, and higher transfer of sublimation printing ink. Efficiency can be obtained.

  The particle size of the fine particles B was determined by using a Coulter counter particle size distribution analyzer (TA-II type, manufactured by COULTER ELECTRONICS INS) for a solution in which a small amount of sample was added to a methanol solution and dispersed for 3 minutes with an ultrasonic disperser. ) And measured with an aperture of 50 μm or 200 μm.

  As long as the effect of the sublimation ink jet printing transfer paper is exhibited, other fine particles can be blended in addition to the inorganic fine particles and silica particles having a flat crystal structure. Other fine particles include, for example, light calcium carbonate, heavy calcium carbonate, magnesium carbonate, magnesium hydroxide, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, Aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, alumina, colloidal alumina, alumina hydrate (such as pseudoboehmite), aluminum hydroxide, lithopone, zeolite, inorganic halloysite, magnesium hydroxide and other inorganic pigments, styrene plastic pigment And organic pigments such as acrylic plastic pigments, polyethylene, microcapsules, urea resins, melamine resins, and the like. These may be used alone or in appropriate combination of two or more.

  In the ink-receiving layer coating material, CMC is contained in a proportion of 10 to 80 parts by mass and preferably 30 to 60 parts by mass with respect to a total of 100 parts by mass of fine particles A and B. When the amount of CMC is less than 10 parts by mass, since the CMC is small, fine particles cannot be uniformly fixed on the ink receiving layer, and image reproducibility deteriorates. On the other hand, when the amount of CMC exceeds 80 parts by mass, the ratio of CMC to the fine particles A and B becomes too high, so that the CMC is easily contracted by the heat during the thermal transfer process. The resulting curl becomes larger.

  When the ink printed on the sublimation type ink jet textile transfer paper is textile transferred to a cloth or the like, the temperature and the heating time are adjusted according to the kind of the cloth and the kind of the sublimation ink. For example, when sublimation transfer is performed on a material called Ponji used for climbing, it is necessary to infiltrate the ink to the back side of the fabric, so transfer is performed at a high temperature of 200 to 215 ° C. In addition, when sublimation transfer is performed on a thick fabric (such as suede) used for a coat, etc., the sublimation temperature of the ink is about 190 ° C. so that the reproducibility of the edge of the printing portion (sharpness of the outline) is obtained. Transfer is performed at a close temperature.

  Therefore, it is preferable that the average value of curl heights at the four corners of the sample produced after storing the sample obtained by cutting the sublimation type inkjet printing transfer paper to A4 size at 190 to 215 ° C. for 1 minute is 50 mm or less, and 20 mm or less. More preferably. When the average value of the curl height at the four corners of the A4 size sample is 50 mm or less, even when pressing with a flat plate in the flat table type transfer press system, the sublimation type ink jet printing transfer paper and the fabric are not generated without causing wrinkles. Can be adhered. As a result, it is possible to suppress a phenomenon called ghost, in which the sublimation type ink jet textile transfer paper and the fabric are shifted in the transfer step and the image of the printing portion is blurred.

  The ratio of fine particles A and fine particles B (fine particles A / fine particles B) contained in the ink receiving layer coating is 15/85 to 90/10 in terms of mass ratio, and 35/65 to 60. / 40 is more preferable. If the fine particle A / fine particle B is less than 15/85, the amount of sublimation printing ink increases due to the increase of the fine particle B, but the formation of the ink barrier layer becomes insufficient due to the decrease of the fine particle A. The sublimation efficiency during transfer is reduced. On the other hand, if the fine particle A / fine particle B exceeds 90/10, the ink barrier layer becomes excessive due to the increase of the fine particle A, and the acceptance amount of the sublimation printing ink decreases due to the decrease of the fine particle B. Ink drying property is reduced.

  In the sublimation type ink jet printing transfer paper formed using the above material, the air permeability (Gurley air permeability) according to the air permeability measuring method based on JIS P 8117: 2009 is 100 to 10,000 seconds. When the Gurley air permeability is within this range, both the good transferability of sublimated ink from the ink receiving layer to the transfer medium and the prevention of the sublimation ink from coming off to the back side of the paper are compatible. be able to. When the Gurley air permeability is less than 100 seconds, the sublimated ink is lost to the back side of the paper and the transfer hot roll or hot plate is soiled, which is not preferable. On the other hand, when the Gurley air permeability exceeds 10,000 seconds, the moisture in the ink receiving layer does not escape during thermal transfer, which may cause blisters and the like, which is not preferable.

(Production method)
The sublimation type ink jet printing transfer paper according to the present embodiment prepares an ink receiving layer coating material in which CMC, inorganic fine particles (fine particles A) having a flat crystal structure, silica particles (fine particles B), and water as a solvent are mixed. Then, the prepared ink receiving layer coating material can be produced by coating on a substrate and drying.

  The ink receiving layer paint is prepared by separately preparing CMC and ink receiving layer paint A containing inorganic fine particles having the above-described flat crystal structure and ink receiving layer paint B containing CMC and silica particles described above, The ink receiving layer coating materials A and B may be adjusted as a mixed coating material mixed at a predetermined ratio. In this case, the ink receiving layer coating material A preferably contains CMC at a ratio of 10 to 30 parts by mass with respect to 100 parts by mass of the inorganic fine particles having a flat crystal structure. The ink receiving layer coating material B preferably contains CMC at a ratio of 100 to 300 parts by mass with respect to 100 parts by mass of the silica particles. The mixing ratio of these ink receiving layer coating materials A and B (ink receiving layer coating material A / ink receiving layer coating material B) is 50/50 to 90/10 in terms of the solid mass ratio, and is the sum of the inorganic fine particles and silica particles. The mixed paint is adjusted so that CMC is contained at a ratio of 10 to 80 parts by mass with respect to 100 parts by mass.

  The method for preparing the ink receiving layer coating is not particularly limited. For example, when a low-temperature fine particle-dispersed slurry of about 20 to 30 ° C. is added to a high-temperature CMC of about 65 to 80 ° C., the aggregation of fine particles This is not preferable because it is difficult to produce a state in which fine particles are uniformly spread on the coated surface and hinders the formation of an ink barrier layer. A method in which a water-soluble resin such as CMC or PVA is added to the fine particle-dispersed slurry and mixed and dispersed at about 20 to 45 ° C. from the point that it can be made into a paint while maintaining a fine particle dispersion state. It can be suitably employed.

  The solid content concentration of the ink-receiving layer coating is not particularly limited, but from the characteristics of CMC, which is the main component, in order to form a continuous film, a high molecular weight with a high solid content concentration and high viscosity is preferred. However, if the solid content concentration is too high, the viscosity of the mixed paint increases, which is contrary to the coating workability. Therefore, in practice, the solid content concentration is preferably about 10 to 20%. If the solid content concentration of the mixed paint is less than 10%, the mixed paint easily penetrates into the base material, and it is necessary to increase the coating amount of the mixed paint in order to obtain a continuous film. Too much tends to cause dry wrinkles. As a result, not only the appearance of the paper is deteriorated, but also heat transfer at the time of ink transfer may be uneven due to paper habit. When the solid content concentration of the ink-receiving layer coating material B exceeds 20%, the viscosity of the mixed coating material becomes high, and it becomes difficult to control the coating amount of the mixed coating material by a normal coating method.

  Further, when the ink receiving layer coating materials A and B are separately prepared and the ink receiving layer coating material is prepared by a mixed coating material obtained by mixing them, the following advantages are obtained.

  In general, a printing transfer paper obtained by increasing the silica content in the ink-receiving layer coating improves the ink drying property during ink jet printing, but the ink residue on the printing transfer paper during transfer printing to a transfer object. The amount tends to increase. For example, in a paint prepared by adding a water-soluble resin such as CMC after mixing clay slurry and silica slurry, which is a common paint preparation method, ink drying improves as the silica content increases. However, the effect of lowering the residual ink density on the paper surface after sublimation transfer is largely lost due to the ink blocking effect of clay. That is, in the case of adopting a normal coating preparation method, the relationship between the ink drying property and the remaining amount of ink is such that the inorganic fine particles having a flat crystal structure in the ink receiving layer coating A and the silica particles in the ink receiving layer coating B According to the ratio, it can be said that the ink drying property changes almost linearly, but the effect of reducing the remaining amount of ink seems to have expired earlier.

  On the other hand, when the ink receiving layer coating material A and the ink receiving layer coating material B are mixed to form a mixed coating material as in the manufacturing method according to the present embodiment, the ink drying property is determined by the silica in the ink receiving layer coating material B. Although it changes linearly according to the ratio of the particles, the amount of ink remaining on the sublimation type inkjet textile transfer paper II decreases, that is, the direction in which the transfer density increases. That is, the silica particles contained in the ink receiving layer coating B improve the ink drying property, while the inorganic fine particles having a flat crystal structure contained in the ink receiving layer coating A have a strong effect of reducing the remaining amount of ink. it is conceivable that. The reason why such an effect appears is not clear, but by preparing the coating materials separately, the inorganic fine particles having the flat crystal structure of the ink receiving layer coating material A and the silica particles of the ink receiving layer coating material B have their respective functions. On the other hand, in ordinary paint preparation methods, silica particles are easy to exert their functions, but the function of inorganic fine particles having a flat crystal structure is difficult to be exhibited. It is thought that. Therefore, in the manufacturing method according to the present embodiment, the relationship between the ink drying property and the remaining amount of ink is the ratio of the inorganic fine particles having a flat crystal structure in the ink receiving layer coating A and the silica particles in the ink receiving layer coating B. However, it is considered that in the normal paint preparation method, the effect of suppressing the remaining amount of ink becomes large, and the change is not linear.

  In the mixed coating material, the ratio of the ink receiving layer coating material A to the ink receiving layer coating material B (ink receiving layer coating material A / ink receiving layer coating material B) is 20/80 to 80/20 in mass ratio of solid content. It is preferably 25/75 to 75/25. If the ratio between the two is less than 20/80, the characteristics of the ink-receiving layer coating material A are not sufficiently exhibited, and the residual ink density on the paper surface may increase. When the ratio of both exceeds 80/20, the characteristics of the ink receiving layer coating material B are hardly exhibited, and the effect of improving the ink drying property may be insufficient.

  The method for preparing the mixed paint is not particularly limited. For example, each of the ink receiving layer paint A and the ink receiving layer paint B separately prepared by the above methods is adjusted so that the ratio of both falls within the above range, for example. A method of stirring and mixing uniformly at about 20 to 45 ° C. can be employed.

  In addition, although there is no limitation in particular also in the solid content density | concentration of mixed paint, it is preferable that it is about 10 to 22% from the point of controlling easily the coating amount of the mixed paint by a normal coating system.

  Then, the sublimation type ink jet printing transfer paper according to this embodiment can be produced by applying the mixed paint to the base material and forming the sublimation type printing ink receiving layer on the base material.

  The coating method of the mixed paint is not particularly limited, and the above-mentioned mixed paint can be applied using a known coating machine such as an air knife coater, roll coater, bar coater, comma coater, blade coater, etc. it can. Among these, it is preferable to use an air knife coater in terms of suppressing streak generation due to the presence of fine particles acting as a filler and forming a uniform sublimation printing ink receiving layer by contour coating on the paper surface. .

The coating amount of the coating mix (dry) is in the range of 3~13g / ^{m 2,} preferably in the range of 3 to 10 g / ^{m 2.} The mixed paint contains inorganic particles having a flat crystal structure, which are fine particles A, and silica particles, which are fine particles B. The silica particles are classified into hydrophilic fine particles, secondary clays, and delaminated clays. Since it is bulkier than the inorganic fine particles having a typical flat crystal structure, the quality of the sublimation ink jet printing transfer paper can be improved with a smaller coating amount. If the coating amount of the mixed paint is less than 3 g / m ² , cockling (rippling) due to penetration of the sublimation printing ink into the base material may occur, or it may be difficult to completely cover the base material with the mixed paint. Further, a coating defect such as a fine uncoated portion, that is, a pinhole is generated, and the reproducibility of the image is lowered. When the coating amount of the mixed paint exceeds 13 g / m ² , the printing and transfer quality of the sublimation printing ink is improved by increasing the coating amount. However, when the heat transfer at the time of thermal transfer, the sublimation printing ink receiving layer Since the degree of dimensional change due to the shrinkage of the paper is different from the base material, curling and unevenness of the transfer surface are generated. As a result, the contact between the cloth and the paper becomes non-uniform, which causes uneven transfer density. In addition, since the difference in the partial coating amount increases, the reproducibility of the image decreases.

  In addition, regarding CMC, which is a water-soluble resin, contained in the sublimation type printing ink receiving layer, the viscosity at 30 ° C. of a 15% solution of the CMC is 0.15 to 6 Pa · s, and further 0.2 to 5 Pa. -It is preferable that it is s. Thereby, since the viscosity of CMC is low, the continuous film does not have a defect without causing a phenomenon that the coating film of the sublimation type printing ink receiving layer is cut off. Conversely, if the CMC viscosity is too high, coating becomes difficult, and if the solid content is decreased to reduce the viscosity, a drying load is applied. It is also possible to avoid the point that it may adversely affect the formation.

  Further, in the sublimation type ink jet printing transfer paper according to this embodiment, an under layer containing CMC may be formed between the sublimation type printing ink receiving layer and the substrate. Since the under layer contains CMC, which is the main component of the sublimation type printing ink receiving layer, the wet paint becomes more familiar immediately after application of the mixed paint. The effect that it becomes easy to obtain a film is produced.

  Although there is no limitation in particular in content of CMC in an under layer, it is preferable that it is about 60-100 mass%.

  In addition to CMC, the under layer paint for forming the under layer includes, for example, starch derivatives such as starch, oxidized starch, cationized starch, etherified starch, and phosphate esterified starch, hydroxymethyl cellulose, hydroxyethyl cellulose. , Cellulose derivatives such as cellulose sulfate, PVA of various saponification degrees and various PVA derivatives such as silanol-modified products, carboxylated products, and cationized products, water-soluble natural polymer compounds such as casein, gelatin, modified gelatin, and soy protein, polyvinyl Components such as pyrrolidone, sodium polyacrylate, sodium styrene-maleic anhydride copolymer sodium salt, water-soluble synthetic polymer compound such as sodium polystyrene sulfonate may be contained, and the effect of providing an under layer is not hindered. limit There is no particular limitation.

  The same paint as the ink receiving layer paint may be used as the under layer paint. In this case, coating defects can be sufficiently prevented with a smaller coating amount than when the ink receiving layer coating material is applied once.

When the under layer is formed, the coating amount of the under layer paint (after drying) is 3 g / m ² or less. If the coating amount of the under layer coating (after drying) exceeds 3 g / m ² , the Gurley air permeability becomes too high, blisters are generated during printing transfer, and the reproducibility of the transferred image is reduced at the blister generation site. .

  As described above, the sublimation type ink jet printing transfer paper contains a specific ratio of CMC as a water-soluble resin and inorganic fine particles having a flat crystal structure as a filler on a substrate having a specific water absorption, A sublimation type printing ink receiving layer is formed from a mixed paint of a paint capable of greatly reducing pinhole expression and a paint containing CMC as a water-soluble resin and silica particles as a filler. Accordingly, the sublimation type ink jet printing transfer paper is excellent in the drying property of the sublimation type printing ink during ink jet printing, and the remaining amount of the sublimation type printing ink on itself is transferred during transfer printing onto the transfer object. The transfer efficiency to the transfer object such as image reproducibility, transfer image resolution, transfer image density level, and uniformity thereof is excellent.

  Accordingly, the components described in the detailed description include not only components essential for solving the problem but also components not essential for solving the problem in order to illustrate the above technique. obtain. Therefore, it should not be immediately recognized that these non-essential components are essential as the non-essential components are described in the detailed description.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this indication, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

  Hereinafter, examples in which the sublimation ink jet printing transfer paper and the manufacturing method thereof according to the present disclosure are specifically implemented will be described. However, the present disclosure is not limited to only these examples. The number of parts in the blend is the number of solids.

  The components used in the following examples and comparative examples are as follows.

(1) Kraft pulp / LBKP
Hardwood bleached kraft pulp Freeness (CSF) in accordance with JIS P 8121-2: 530 ml
・ NBKP
Softwood bleached kraft pulp Freeness (CSF) according to JIS P 8121-2: 580 ml

(2) Water-soluble resin / CMC-A
FINNFIX2 (manufactured by CP Kelco)
・ CMC-B
Serogen 5A (Daiichi Kogyo Seiyaku Co., Ltd.)
・ PVA
Kuraray Poval PVA105 (manufactured by Kuraray Co., Ltd., degree of saponification: 98-99 mol%,
Degree of polymerization: 500)

(3) Fine particles A (inorganic fine particles having a flat crystal structure)
・ Particle A1
Secondary clay (median diameter d50: 0.7 μm, aspect ratio: 8)
・ Particle A2
Delami clay (median diameter d50: 1.4 μm, aspect ratio: 20)
・ Particle A3
Secondary clay (median diameter d50: 0.4 μm, aspect ratio: 8)
・ Particle A4
Secondary clay (median diameter d50: 2.5 μm, aspect ratio: 8)
・ Particle A5
Secondary clay (median diameter d50: 0.7 μm, aspect ratio: 4)

(4) Fine particles B (inorganic fine particles having a flat crystal structure)
・ Particle B1
Precipitating silica particles Carplex 80D (manufactured by DSL. Japan, average particle size: 15.0 μm)
・ Particle B2
Precipitating silica particles Carplex # 80 (manufactured by DSL. Japan, average particle size: 13.0 μm)
・ Particle B3
Gel type silica particles Carplex BS304F (manufactured by DSL Japan Co., Ltd., average particle size: 8.1 μm)

<Example of substrate production>
(Substrate 1)
Heavy calcium carbonate and talc are added as fillers to 80% by mass of LBKP and 20% by mass of NBKP so that the ash content is 8.0%, and as an auxiliary agent, the total amount of kraft pulp is 100 parts by mass. On the other hand, 0.8 parts by mass of cationized starch, 0.3 parts by mass of alkyl ketene dimer (internal sizing agent), and 0.3 parts by mass of anion-modified polyacrylamide were added to prepare a paper stock. The paper is made with a paper machine, and the time until the ultrasonic transmission intensity of the initial water absorption characteristics measured by a surface / size tester (EST12, manufactured by emtec) reaches 100% (EST size) is 2.0 seconds. A kraft paper was obtained (hereinafter referred to as “base material 1”).

(Substrate 2)
As a filler, heavy calcium carbonate and talc were added so that the ash content would be 0.5%, and auxiliaries were added to 100 parts by weight of the total amount of kraft pulp as a blend of 80% by mass of LBKP and 20% by mass of NBKP. In contrast, 0.8 parts by mass of cationized starch, 1.1 parts by mass of acidic rosin emulsion sizing agent (internal sizing agent), and 0.3 parts by mass of anion-modified polyacrylamide were added to prepare a paper stock. . This stock was made with a paper machine to obtain a kraft paper having an EST size of 0.5 seconds (hereinafter referred to as “base material 2”).

(Substrate 3)
Heavy calcium carbonate and talc are added as fillers to 100% by mass of LBKP so that the ash content is 0.5%. As an auxiliary agent, 0.8% of cationized starch is added to 100 parts by mass of the total amount of kraft pulp. A paper stock was prepared by adding 1.1 parts by weight of an acid rosin emulsion sizing agent (internal sizing agent) and 0.3 parts by weight of an anion-modified polyacrylamide. This stock was made with a paper machine to obtain a kraft paper having an EST size of 0.5 seconds (hereinafter referred to as “base material 3”).

(Substrate 4)
A kraft paper having an EST size of 3.0 seconds was obtained by the same material and method as the base material 1 except that the amount of the internal sizing agent was 1.5 parts by mass (hereinafter referred to as the base material 4). ).

(Substrate 5)
A kraft paper having an EST size of 0.05 seconds was obtained by the same material and method as the base material 2 except that the amount of the internal sizing agent was 0.1 parts by mass (hereinafter referred to as the base material 5). ).

  Table 1 below shows the mixing ratio of LBKP and NBKP of the base materials 1 to 5 and the EST sizing degree.

<Example of ink-receiving layer coating preparation>
(Paint 1-21)
The water-soluble resin and the fine particles A and B were mixed with water (solvent) in the ratio shown in Table 2 to prepare paints 1 to 21. More specifically, after the fine particles A were dispersed in an appropriate amount of water, the fine particles B were added and dispersed to prepare a mixed dispersion slurry. A water-soluble resin was added to the resulting mixed dispersion slurry, and water was appropriately added to adjust the final solid content concentration to the concentration shown in Table 2 (mixing method 1 in Table 2). As for the paints 12 and 13, the ink receiving layer paint A in which fine particles A and a water-soluble resin are dispersed in an appropriate amount of water, and the ink receiving layer paint in which fine particles B and a water-soluble resin are dispersed in an appropriate amount of water. B were prepared, ink receiving layer paints A and B were mixed, water was added as appropriate, and the final solid content concentration was adjusted to the concentration shown in Table 2 (mixing method 2 in Table 2).

<Preparation example of under layer paint>
An aqueous solution of CMC-A having a solid content concentration of 15% was used as an under layer paint.

<Production example of sublimation inkjet printing paper>
(Examples 1-22 and Comparative Examples 1-6)
Using a knife coater on one side of the substrate, the ink receiving layer coating was applied and dried at about 130 ° C. to form a sublimation printing ink receiving layer, thereby producing a sublimation ink jet printing transfer paper. In Example 4, undercoating was applied to one side of the substrate using a knife coater and dried, and then the ink receiving layer coating was applied. Table 3 shows the combinations of the base material and the ink receiving layer coating material used in each Example and each Comparative Example, and the coating amount (after drying) of the ink receiving layer coating material.

<Evaluation>
The obtained sublimation type inkjet printing transfer paper was evaluated by the following methods.

  The ink jet recording evaluation was performed using an ink jet printer (Seiko Epson Corporation, EP704A type) and sublimation printing ink (Power System Co., Ltd., sublimation ink SUSON for EPSON SU-110 series). Images for each evaluation were printed in the mode. Further, a polyester cloth material was used for the transfer object. The image was transferred by closely transferring the image printed on the sublimation type ink jet textile transfer paper with the ink jet printer and the polyester cloth material, and keeping the temperature at 190 ° C. for 90 seconds for thermal transfer.

(1) Gurley air permeability The Gurley air permeability was measured using a Gurley standard type densometer (manufactured by Kumagaya Riki Kogyo Co., Ltd.) in accordance with JIS P 8117: 2009.

(2) Ink absorption / drying Immediately after black solid printing on each sublimation type ink jet printing transfer paper with an ink jet printer, the printed surface is rubbed with tissue paper and wiped to visually check whether the ink on the paper is stretched or not. And evaluated based on the following evaluation criteria. A rating of 3 or higher is a practical level.
(Evaluation criteria)
5: Drying is very fast and there is no ink elongation on the paper after wiping.
4: Drying is fast and there is almost no elongation of ink on the paper surface after wiping.
3: Drying is slightly slow, and slight elongation of ink is observed on the paper surface after wiping, but there is no practical problem.
2: Drying is slow, and ink elongation is observed on the paper surface after wiping.
1: Drying is very slow, stains on the device and prints are observed, and the ink has a long elongation on the paper surface after wiping and cannot be used.

(3) Image reproducibility The image reproducibility of each digital image on each sublimation inkjet printing paper was visually observed and evaluated based on the following evaluation criteria. A rating of 3 or higher is a practical level.
(Evaluation criteria)
5: No difference from the original plate is recognized, and the image reproducibility is excellent.
4: Almost no difference from the original plate is recognized, and the image reproducibility is good.
3: A slight difference from the original plate is recognized and the image reproducibility is slightly inferior, but there is no practical problem.
2: Many differences from the original plate are recognized, the image reproducibility is inferior, and it cannot be used.
1: Significant difference from the original plate, almost no image reproducibility, and unusable.

(4) Back-through prevention The back-through prevention is achieved by transferring the printed image to a transfer object by printing four colors of CMYK on each sublimation type inkjet printing transfer paper with an inkjet printer and then pressing with a hot plate. did. Incidentally, plain paper was interposed between the sublimation type ink jet printing transfer paper and the hot plate. After the transfer, the presence or absence of ink adhering to the intervening plain paper was visually confirmed and evaluated based on the following evaluation criteria.
(Evaluation criteria)
3: No ink adheres to the intervening plain paper.
2: A slight amount of ink is adhered to the intervening plain paper, but the amount is practically acceptable.
1: Adhesion of the ink to the intervening plain paper is noticeable, and this is an adhesion amount that causes a problem in practice.

(5) Curling aptitude Each sublimation type inkjet printing transfer paper was cut into A4 size, and this sample was stored for 1 minute in a dryer at 190 to 215 ° C. Place the sample after storage on the surface plate so that the convex surface is the bottom surface, measure the height of the four corners from the surface plate while the sample is stationary, and use the average value of the measured values as the evaluation value. did.
(Evaluation criteria)
3: The evaluation value is 20 mm or less.
2: The evaluation value is 50 mm or less.
1: The evaluation value exceeds 50 mm.

  Table 4 below shows the evaluation results of the sublimation type ink jet textile transfer paper according to each example and each comparative example.

  In the sublimation type ink jet printing transfer paper according to Examples 1 to 18, the median diameter and aspect ratio of the inorganic fine particles having a flat crystal structure contained in the ink receiving layer, and the mixing of the inorganic fine particles having the flat crystal structure and the silica particles The ratio of the added amount of CMC to the inorganic fine particles and silica particles, the coating amount of the ink receiving layer coating (after drying), and the Gurley air permeability are within the above-mentioned numerical ranges. It was confirmed that the drying property and the reproducibility of the transferred image were excellent, the ink see-through during the transfer was suppressed, and further, even when used in a cut sheet shape, curling due to heating was suppressed.

  In addition, the sublimation type ink jet printing transfer paper according to Examples 19 to 22 is the same as that of Example 1 in the type of paint and the coating amount, and the base material 1 is changed to the base materials 2 to 5, respectively. Regardless of the type of substrate, as in Example 1, it has excellent ink absorptivity / dryability and reproducibility of the transferred image, suppresses ink back-through during transfer, and is used in a cut sheet shape. Even in this case, it was confirmed that curling due to heating was suppressed. However, in Examples 19, 21 and 22, the image reproducibility was slightly lowered as compared with Example 1. This is because the EST sizing degree of the substrates 2 and 5 used in Examples 19 and 22 is the lower limit value of the above-mentioned preferable range or a value smaller than this, so that the ink receiving layer has a slight defect. It is considered that the image reproducibility is slightly lowered. Moreover, in the base material 4 used in Example 21, since the EST sizing degree is the upper limit value of the above-described preferable range, the adhesion between the ink receiving layer and the base material is slightly lowered, and thereby the image reproducibility is reduced. It is thought that it decreased slightly.

  In Comparative Example 1, since the coating amount of the ink receiving layer coating was too small, a coating defect occurred in the ink receiving layer, thereby greatly reducing the image reproducibility. Further, in Comparative Example 1, since the value of the Gurley air permeability was too small, ink breakthrough occurred remarkably. In Comparative Example 2, the amount of curling increased due to the coating amount of the ink receiving layer coating being too large.

  In Comparative Example 3, the amount of the Gurley air permeability increased due to the application amount of the underlayer paint being too large. As a result, blisters were generated during transfer, and the image reproducibility was lowered.

  In Comparative Example 4, the amount of curling increased because the proportion of CMC to the total of fine particles A and B was too large. Further, in Comparative Example 5, since the blending ratio of CMC with respect to the sum of the fine particles A and B was too small, the fine particles in the ink receiving layer were not fixed uniformly, and the image reproducibility was lowered.

  In Comparative Example 6, since the median diameter of the fine particles A was too large and settled in the ink receiving layer coating, the ink receiving layer coating was not stably formed and the image reproducibility was lowered. In Comparative Example 7, since the aspect ratio of the fine particles A was too small, a sufficient ink barrier layer could not be formed, and ink breakthrough occurred remarkably.

  In Comparative Example 8, since the fine particles B were not blended, the ink absorptivity / dryability was lowered. In Comparative Example 9, since the fine particles A were not blended, the image reproducibility was lowered.

  As described above, according to the present invention, sublimation ink jet printing that is suitable for transfer printing by the ink jet recording method, can suppress the back-through of ink at the time of transfer printing, and does not easily wrinkle when used in a sheet shape. A transfer paper and a manufacturing method thereof can be provided.

  The sublimation type ink jet printing transfer paper in the present disclosure is particularly suitable for an ink jet recording system in which printing using a sublimation type printing ink is performed by an ink jet printer.

Claims (5)

A sublimation printing ink receiving layer is formed on a substrate;
The sublimation printing ink receiving layer comprises an ink receiving layer coating containing a water-soluble resin, fine particles A, and fine particles B,
The fine particle A is an inorganic fine particle having a flat crystal structure, has a median diameter d50 in the range of 0.4 to 2.3 μm, and has an aspect ratio of 5 or more.
The fine particles B are silica particles,
The ratio of the fine particles A and the fine particles B (fine particles A / fine particles B) is 15/85 to 90/10 in mass ratio,
The water-soluble resin is sodium carboxymethyl cellulose,
In the ink-receiving layer coating material, the sodium carboxymethylcellulose is contained at a ratio of 10 to 80 parts by mass with respect to 100 parts by mass in total of the fine particles A and B.
The coating amount (dry) of the ink receiving layer coating is 3 to 13 g / m ² ,
A sublimation type ink jet textile transfer paper characterized by having an air permeability measured by an air permeability measurement method based on JIS P 8117: 2009 of 100 to 10,000 seconds.   A sample obtained by cutting the sublimation-type inkjet printing transfer paper into A4 size is stored for 1 minute in a dryer at 190 to 215 ° C., and an average value of curl heights at four corners of the sample is 50 mm or less. The sublimation type ink jet printing transfer paper according to claim 1. An under layer is formed between the sublimation printing ink receiving layer and the substrate,
The sublimation type inkjet printing transfer paper according to claim 1 or 2, wherein the under layer contains sodium carboxymethylcellulose.   The said base material is a base material which is 0.1 to 3.0 seconds until the ultrasonic transmission intensity | strength of an initial water absorption characteristic reaches 100% measured with the surface and sizing degree tester (EST12). Item 4. The sublimation inkjet printing transfer paper according to any one of Items 1 to 3. A method for producing a sublimation ink jet printing transfer paper,
Preparing an ink-receiving layer coating material containing a water-soluble resin, fine particles A, and fine particles B;
Coating the ink-receiving layer paint on a base material, and forming a sublimation printing ink-receiving layer on the base material,
The fine particle A is an inorganic fine particle having a flat crystal structure, has a median diameter d50 in a range of 0.4 to 2.3 μm, and an aspect ratio of 5 to 30,
The fine particles B are silica particles,
The ratio of the fine particles A and the fine particles B (fine particles A / fine particles B) is 15/85 to 90/10 in mass ratio,
The water-soluble resin is sodium carboxymethyl cellulose,
A method for producing a sublimation ink jet printing transfer paper, wherein the sodium carboxymethylcellulose is contained in the ink-receiving layer coating in a proportion of 10 to 80 parts by mass with respect to 100 parts by mass of the fine particles A and B in total.