JP6689043B2 - Sublimation type inkjet printing transfer paper and method for producing the same - Google Patents

Description

  The present invention relates to a sublimation type inkjet printing transfer paper and a method for manufacturing the same. More specifically, the present invention relates to a sublimation-type ink-jet printing transfer paper used when a sublimation-type printing ink is printed by an ink jet recording method in a sublimation-type printing transfer method for transferring a printed image to a cloth, and a manufacturing method thereof.

  The transfer printing method includes a melt-type transfer printing method using an ink composed of a thermosoftening 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. There are a print type transfer printing method, a sublimation type printing transfer method using a heat sublimation dye, and the like.

  Conventionally, various printing plates and a printing machine corresponding thereto have been required to form a transfer printing sheet, but in recent years, a transfer printing sheet for an ink jet recording system corresponding to a small lot has been proposed. Demand for sublimation-type printing and transfer methods for lots is expanding.

  The sublimation-type printing transfer method is a method in which a sublimation-type inkjet printing transfer paper is superposed on a sublimation-type inkjet printing transfer paper by overlaying a fabric such as polyester to be transferred onto a heating dryer. Then, the transfer printing is performed on the transfer target. The sublimation-type printing transfer method has an advantage that it can print a sharp pattern, which is difficult with other transfer methods, without impairing the texture of the printed material.

  As the sublimation ink jet printing transfer paper for the ink jet recording method, there has been proposed one in which an ink receiving layer containing a pigment such as silica or a binder such as polyvinyl alcohol is provided on a base material (Patent Document 1). References 1 and 2).

  In the case of a sublimation type inkjet printing transfer paper provided with an ink receiving layer containing a pigment such as silica, there is an advantage that the sublimation type printing ink has good drying property during inkjet printing, At the time of transfer printing on an object, the amount of sublimation type printing ink remaining on the sublimation type inkjet printing transfer paper tends to increase. As a result, the transfer to the transfer target becomes insufficient, and transfer efficiency to the transfer target such as image reproducibility, transfer image resolution, transfer image density level, and uniformity thereof has recently been demanded. There is a problem that you cannot reach the level you are in.

JP, 2003-276309, A Japanese Patent Publication No. 2002-292995

  The present invention has been made in view of the background art described above, and is excellent in the drying property of a sublimation-type printing ink during inkjet printing, and is a sublimation-type inkjet printing transfer paper during transfer printing onto a transfer target. Sublimation-type inkjet that has a low remaining amount of sublimation-type textile printing ink and is excellent in transfer efficiency to a transfer target such as image reproducibility, transfer image resolution, transfer image density level, and uniformity of these. An object of the present invention is to provide a textile transfer paper and a simple manufacturing method thereof.

The present invention is
A method of manufacturing a sublimation type ink jet printing transfer paper is sublimation textile ink-receiving layer on the substrate is formed ing,
A step of preparing an ink receiving layer coating material A from at least a water-soluble resin A and fine particles A;
A step of preparing an ink receiving layer coating material B from at least a water-soluble resin B and fine particles B;
Mixing the ink receiving layer coating material A and the ink receiving layer coating material B to prepare a mixed coating material;
A step of applying the mixed coating material on a base material and forming a sublimation type printing ink receiving layer on the base material,
The substrate has a 10 second Cobb water absorption of 5 to 20 g / m ² according to JIS P 8140,
Prior Symbol ink-receiving layer coating A,
The water-soluble resin A is at least sodium carboxymethylcellulose, and in the ink-receiving layer coating material A, the sodium carboxymethylcellulose is contained in a proportion of 100 to 400 parts by mass with respect to 100 parts by mass of the fine particles A,
The fine particles A are at least inorganic fine particles having a tabular crystal structure,
The inorganic fine particles having a tabular crystal structure have a median diameter d50 in the range of 0.4 to 2.3 μm and an aspect ratio of 5 to 30,
By using a dropping method by an oil absorption test method based on JIS P 3001 (1976) using n-hexadecane, five different positions on a layer A formed from the ink receiving layer coating material A on the base material are used. , 1 minute after each dropwise addition of n-hexadecane, expression at 5 locations based on the number of expressed n-hexadecane traces that appeared on the surface of the base material on which the layer A was not formed at each dropping location The average number is 5 or less,
In the ink receiving layer coating material B,
The water-soluble resin B is at least sodium carboxymethyl cellulose,
The fine particles B are at least silica particles,
The coating amount (dry) of the mixed coating material is ² to 12 g / m ² , and relates to a method for producing a sublimation type inkjet printing transfer paper.

  The sublimation type inkjet printing transfer paper of the present invention is excellent in the drying property of the sublimation type printing ink at the time of inkjet printing, and at the time of the transfer printing to the transfer target, the sublimation type printing on the sublimation type inkjet printing transfer paper. The remaining amount of ink is small, and the transfer efficiency to the transfer target such as the image reproducibility, the resolution of the transferred image, the density level of the transferred image, and the uniformity thereof is excellent.

  Further, according to the manufacturing method of the present invention, it is possible to efficiently manufacture a sublimation-type inkjet printing transfer paper having such excellent characteristics in a simple process.

(Embodiment)
The sublimation type inkjet printing transfer paper of the present invention has a sublimation type printing ink receiving layer formed on a substrate.

  The base material used in the present invention 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 it does not cause excessive thermal contraction by heating during thermal transfer. For example, paper containing wood pulp as a main component, porous resin film made of a thermoplastic resin containing inorganic fine particles, non-woven fabric, cloth, resin-coated paper, synthetic paper and the like can be mentioned.

  The base material on which the effect of the present invention remarkably appears is a porous material in which the sublimation-type printing ink is easily sublimated by heating the back surface of the sublimation-type inkjet printing transfer paper. Specifically, it is a paper, a non-woven fabric, a cloth or the like containing wood pulp as a main component.

  As the base material, it is preferable to use paper containing wood pulp as a main component, and it is particularly preferable to use kraft paper. Kraft paper has excellent dimensional stability, can be recycled, unlike films, and has excellent absorption and drying properties for sublimation type printing ink.

  In the present invention, kraft paper will be described as an example of a substrate that is preferably used in the present invention. The kraft paper suitable for use in the present invention is one that satisfies the quality of conventional packaging paper as defined in JIS P 3401, and a piece dried by a Yankee dryer, which is in the category of kraft paper. Since glossy paper (Yankee paper) has excellent dimensional stability, excellent image reproducibility can be achieved.

The base material used in the present invention preferably has a basis weight of 50 to 140 g / m ² , and more preferably 55 to 110 g / m ² . If the basis weight is less than 50 g / m ² , in the case of current inkjet printers, due to its performance, cockling (waviness) will occur due to the ink seeping into the kraft paper at the normal ink amount, and it will be reversed during transfer heating. The kraft paper shrinks, the adhesiveness to the cloth as the transfer target becomes low, and the quality of the transferred image tends to deteriorate. Further, the reduction of the tensile strength and the tear strength facilitates the paper breakage. When the grammage exceeds 140 g / m ² , the heat transfer to the transfer target during heat transfer of the sublimation printing ink tends to be poor, and transfer efficiency tends to decrease.

  The coated surface of the mixed coating material on the substrate preferably has a Bekk smoothness of 30 to 400 seconds in accordance with JIS P 8119, and more preferably 50 to 300 seconds. If the Beck's smoothness is less than 30 seconds, the sublimation-type printing ink receiving layer tends to have a difference between a portion that has penetrated into the substrate and a portion that has not penetrated into the substrate, and coating defects tend to occur. Further, although the sublimation printing ink has high absorption and drying properties during printing, the image reproducibility decreases, and the image reproducibility and transfer efficiency at the time of transfer of the sublimation printing ink to the transfer target decrease. Tend. In particular, single-glossy paper has a high degree of smoothness on the back side (wire side of the paper machine) that has been dried with a Yankee dryer, so there is less risk of coating defects, and excellent image reproducibility with sublimation printing ink. In addition to having strike-through prevention properties, transfer reproducibility, transfer image resolution, transfer image density level, and uniformity of transfer image to transfer target when transferred to transfer target Excellent efficiency. At the same time, since the surface of the substrate is not flattened, it has the effect of improving the thermal sublimation property of the sublimation-type printing ink when the sublimation-type printing ink is heat-transferred by being brought into close contact with a heating dryer. However, when the Beck smoothness exceeds 400 seconds, the adhesion between the sublimation type printing ink receiving layer and the substrate is lowered, and the thin portion of the ink receiving layer tends to induce coating defects. Further, unevenness occurs in the formation of the sublimation type printing ink receiving layer, and the image reproducibility tends to decrease.

  Kraft paper that can be used in the present invention is composed of raw materials used in the so-called papermaking field. The pulp to be used is not particularly limited, but for example, chemical pulp such as unbleached softwood kraft pulp (NUKP), bleached softwood kraft pulp (NBKP), unbleached kraft pulp (LUKP) and bleached hardwood kraft pulp (LBKP). Thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), refiner mechanical pulp (RMP), refiner ground pulp (RGP), chemiground pulp (CGP), thermoground pulp (TGP), groundwood pulp (GP), Mechanical pulp such as stone ground pulp (SGP) and pressure stone ground pulp (PGW); chemical pulp such as deinking pulp (DIP) and waist pulp (WP); waste paper pulp including mechanical pulp; and the like. From one or two or more It can be used with-option. Among these, hardwood kraft pulp, further using a suitable combination of hardwood bleached kraft pulp and softwood bleached kraft pulp, paper quality strength, flatness of the substrate surface, sublimation type inkjet printing transfer paper of sublimation type printing ink It is preferable in terms of quality confirmation of the printed image.

  Examples of the base material used in the present invention include various starches such as oxidized starch, acetylated starch, esterified starch, and etherified starch, paper-strengthening agents, internal-additive sizing agents such as alkyl ketene dimer, external-addition sizing agents, Additives such as a distillation improver, and fillers such as titanium oxide, clay, talc and calcium carbonate can be blended within an adjustable range.

The base material used in the present invention has a 10-second Cobb water absorption of 5 to 20 g / m ² in accordance with JIS P 8140, and preferably 10 to 16 g / 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 will be poor, and a thin portion of the ink receiving layer will be generated partially, resulting in continuous ink receiving layer. It induces coating defects that can not keep the film. When the water absorbency for 10 seconds Cobb exceeds 20 g / m ² , the sublimation-type printing ink receiving layer easily penetrates into the base material, and a partially deeply penetrated portion cannot maintain a continuous coating of the ink receiving layer. Induce.

  The sublimation type printing ink receiving layer is composed of a mixed coating of an ink receiving layer coating material A containing at least a water-soluble resin A and fine particles A and an ink receiving layer coating material B containing at least a water-soluble resin B and fine particles B. , Formed on the base material.

  First, the ink receiving layer coating material A will be described.

  The water-soluble resin A is mainly used as a binder and is at least sodium carboxymethyl cellulose (hereinafter referred to as CMC). For example, starch such as starch, oxidized starch, cationized starch, etherified starch, phosphoric esterified starch, etc. Derivatives, cellulose derivatives such as hydroxymethyl cellulose, hydroxyethyl cellulose and cellulose sulfate, polyvinyl alcohols with various saponification degrees (hereinafter referred to as PVA) and silanol modified products thereof, carboxylated products, various PVA derivatives such as cationized products, casein, gelatin, modified Water-soluble natural polymer compounds such as gelatin and soybean protein, polyvinylpyrrolidone, sodium polyacrylate, sodium salt of styrene-maleic anhydride copolymer, sodium polystyrene sulfonate, etc. Include polymer compounds may be used together with CMC by selecting one or more from these.

  At least CMC is used as the water-soluble resin A in order to develop the capability of rapidly absorbing and drying the sublimation-type printing ink, which is a feature of the present invention, in the sublimation-type printing ink receiving layer, and the degree of polymerization or molecular weight of CMC is used. However, it is also possible that CMC having a predetermined degree of polymerization and molecular weight is used, and it is preferable to control the temperature at the time of applying the mixed paint containing the ink-receiving layer paint A.

  Suitable CMCs include CMCs having a degree of polymerization of 30 to 80 and a weight average molecular weight of 6600 to 18000. CMC having a degree of polymerization of 30 to 80 and a weight average molecular weight of 6600 to 18000 easily forms a sublimation-type printing ink receiving layer with few coating defects from the viewpoint of viscosity and workability, and contains the ink receiving layer coating material A. It is possible to easily apply the mixed paint. When the degree of polymerization is less than 30 and the weight average molecular weight is less than 6600, the viscosity of CMC is low, which leads to the phenomenon that the coating film of the ink receiving layer is torn off, and defects are likely to occur in the continuous film. . When the polymerization degree is higher than 80 and the weight average molecular weight is higher than 18,000, workability in the coating step may be deteriorated. For example, if the viscosity of CMC is too high, it is difficult to apply, or if the solid content is decreased to reduce the viscosity, a drying load is applied, and if it is kept at high temperature for a long time to reduce the viscosity, the film becomes May adversely affect formation.

  Specific examples of the CMC include, for example, serogen 5A (trade name, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., “Serogen” is a registered trademark), FINNFIX2 (trade name, manufactured by CP Kelco, “FINNFIX” is a registered trademark) and the like. Can be mentioned.

  In the ink receiving layer coating material A, CMC is contained in a proportion of 100 to 400 parts by mass, preferably 150 to 300 parts by mass, based on 100 parts by mass of the fine particles A. If the amount of CMC is less than 100 parts by mass, the absorption and drying properties of the sublimation printing ink with CMC alone are not sufficient, and it is essential to use it in combination with fine particles having high ink absorption. When the amount of CMC exceeds 400 parts by mass, the barrier effect of absorption of the sublimation printing ink by the fine particles A decreases, and the sublimation printing ink remains in the ink receiving layer.

  In the present invention, PVA can be used as the water-soluble resin A together with CMC. Among PVA, particularly PVA having a saponification degree of about 87 to 99 mol%, further 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. Is favorable and has an effect of appropriately leaving the sublimation type printing ink in the sublimation type printing ink receiving layer. In addition, such PVA also has the effect of improving the dispersibility of the fine inorganic particles A having the tabular crystal structure.

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

  When PVA is used together with CMC as the water-soluble resin A, the amount of PVA in the ink-receiving layer coating material A is 15 parts by mass or less, and further 8 parts by mass or less based on 100 parts by mass of the fine particles A. Is preferred. By adjusting the amount of PVA within this range, it is possible to achieve more excellent absorption and drying properties of the sublimation printing ink. When the amount of PVA is more than 15 parts by mass, there is a possibility that the film formation by PVA may interfere with the film formation by CMC and may induce coating defects.

  Further, when the ink receiving layer coating material A is prepared by using CMC and PVA together, adding PVA to the fine particles A before CMC has the effect of reducing coating defects. It is preferable in that respect. The reason for this is not clear, but as the amount of free PVA increases, the inhibition of film formation by CMC is likely to occur, and by contacting PVA with fine particles A before CMC, fine particles A are formed. It is considered that the amount of PVA trapped was larger and the inhibition of film formation by CMC was less.

  The fine particles A contained in the ink receiving layer coating material A are inorganic fine particles having at least a tabular crystal structure.

  In the ink-receiving layer coating material A, the water-soluble resin A contains inorganic fine particles having a tabular crystal structure in combination as a filler, so that the sublimation-type printing ink at the time of printing has a good absorption / drying property. Significantly improved by the synergistic effect with the penetrant contained in the material, the sublimation type inkjet printing transfer paper of the present invention, image reproducibility, heat resistance during heat transfer, image reproducibility on the surface of the transferred material after transfer. In terms of transfer efficiency and transfer efficiency, excellent characteristics can be obtained.

As the inorganic fine particles having a tabular crystal structure, for example, hydrophilic secondary clays and deramie clays are preferably used, and have a median in the range of 0.4 to 2.3 μm, preferably 0.4 to 1.4 μm. By using inorganic fine particles having a diameter d50 and an aspect ratio of 5 to 30, preferably 8 to 20, it is possible to form an ink barrier layer of inorganic fine particles without hindering the formation of a continuous film of CMC. Inorganic fine particles having a median diameter of less than 0.4 μm and an aspect ratio of less than 5 cannot form a sufficient ink barrier layer. With inorganic fine particles having a median diameter of more than 2.3 μm, sedimentation of the fine particles in the ink receiving layer coating material A easily occurs, the handling such as the flowability of the mixed coating material deteriorates, and the stability of the quality is hindered. If the inorganic fine particles have an aspect ratio of more than 30, the barrier property becomes too high and the ink drying property is deteriorated.

  The particle size of the fine particles A used in the present invention is a solution obtained by adding a small amount of a sample to a methanol solution and dispersing them with an ultrasonic disperser for 3 minutes, by a Coulter counter particle size distribution analyzer (manufactured by COULTER ELECTRONICS INS, TA-II type), using a 50 μm aperture.

  Other fine particles can be blended with the inorganic fine particles having the tabular crystal structure as long as the effects of the present invention are exhibited. Other fine particles include, for example, light calcium carbonate, heavy calcium carbonate, magnesium carbonate, magnesium hydroxide, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, and aluminum silicate. , Diatomaceous earth, calcium silicate, magnesium silicate, alumina, hydrated alumina such as colloidal alumina, pseudo-boehmite, aluminum hydroxide, lithopone, zeolite, hydrohalloysite, inorganic pigment such as magnesium hydroxide, styrene plastic pigment, acrylic Examples include organic pigments such as plastic pigments, polyethylene, microcapsules, urea resins, and melamine resins, which may be used alone or in combination of two or more.

  The content of the fine particles A in the ink receiving layer coating material A is preferably 19 to 50 parts by weight, and more preferably 24 to 40 parts by weight with respect to 100 parts by weight of the ink receiving layer coating material A. When the content of the fine particles A is less than 19 parts by mass, the amount of the sublimation printing ink accepted is large, but the formation of the ink barrier layer by the fine particles A is insufficient, and the sublimation efficiency at the time of transfer tends to decrease. , There may be problems of pollution. If the content of the fine particles A exceeds 50 parts by mass, the ink barrier layer becomes excessive, the amount of sublimation-type printing ink accepted decreases, and the ink drying property tends to deteriorate.

  The method for preparing the ink receiving layer coating material A is not particularly limited. For example, when the low temperature fine particle A dispersion slurry of 20 to 30 ° C. is added to CMC of high temperature of 65 to 80 ° C. Aggregation occurs, and it becomes difficult to form a state in which the fine particles A are evenly spread on the coated surface of the mixed coating material, which hinders the formation of the ink barrier layer, which is not preferable. By adding the water-soluble resin A such as CMC or PVA to the fine particle A dispersion slurry, it is possible to form a coating while maintaining the dispersed state of the fine particles A, and the mixture is dispersed at about 20 to 45 ° C. The method of making it possible can be adopted.

  The solid content concentration of the ink receiving layer coating material A thus obtained is not particularly limited, but due to the characteristics of CMC which is a main component, in order to form a continuous film, the solid content concentration is high and the viscosity is high. However, from the viewpoint that they increase the viscosity of the mixed paint and conflict with the coating workability, it is preferably about 10 to 25% for practical use. When the solid content concentration of the ink receiving layer coating material A is less than 10%, the mixed coating material easily penetrates into the substrate, and it is necessary to increase the coating amount of the mixed coating material in order to obtain a continuous film. The moisture content tends to be too large and dry wrinkles tend to occur. As a result, not only the appearance of the paper is deteriorated, but also heat transfer at the time of ink transfer may be non-uniform due to the paper habit. When the solid content concentration of the ink-receiving layer coating material A exceeds 25%, 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.

  In addition, in the ink receiving layer coating material A, the dropping method by the oil absorption test method based on JIS P 3001 (1976) using n-hexadecane is used to form the ink receiving layer coating material A on the substrate. 1 minute after dropping one drop of n-hexadecane at 5 different points on the layer A, the development of traces of n-hexadecane that appeared on the surface of the substrate where the layer A was not formed at each dropping point Based on the number (hereinafter, also simply referred to as pinhole expression), the average of the expression numbers at 5 locations is 5 or less, preferably 3 or less. If the average number of pinhole occurrences exceeds 5, the transfer efficiency of the sublimation-type printing ink in the pinhole portion may decrease, image reproducibility may deteriorate, and relatively large pinholes may occur. Contamination of the ink jet printer due to strike-through of the sublimation type printing ink and pinhole-like white spots appear on the transferred image in a remarkable case. The role of the ink receiving layer coating material A in the mixed coating material is to suppress the absorption of ink on the paper surface other than the silica particle portions which are the fine particles B described later, and to increase the ink transfer amount, but to develop pinholes. By using a paint having a small amount of ink, it is possible to secure such an ink blocking property.

  To adjust the average number of pinholes expressed to 5 or less, for example, the following method can be adopted. That is, in addition to the method of using paper containing wood pulp as the main component as the base material and appropriately adjusting the type of raw material pulp, beating treatment, and the like, kraft paper is used as the base material in accordance with JIS P 8220. Then, the freeness (CSF) according to JIS P 8121-2 after disintegrating the base material on which the layer A is formed is adjusted to a range of about 350 to 650 ml, and the ink receiving layer coating material A It is also possible to employ a method of adjusting the type, concentration, viscosity and the like of the water-soluble resin A blended in

  Next, the ink receiving layer coating material B will be described.

  The water-soluble resin B is mainly used as a binder and is at least CMC. For example, starch derivatives such as starch, oxidized starch, cationized starch, etherified starch and phosphoric esterified starch, hydroxymethyl cellulose, hydroxyethyl cellulose, Cellulose derivatives such as cellulose sulfate, PVA, silanol modified products of PVA, various derivatives such as carboxylated compounds and cationized compounds, casein, gelatin, modified gelatin, natural polymers such as soybean protein, polyvinylpyrrolidone, sodium polyacrylate, styrene- Examples thereof include water-soluble synthetic polymers such as sodium salt of maleic anhydride copolymer and sodium polystyrene sulfonate, and one or more of them can be selected and used together with CMC.

  The CMC used as the water-soluble resin B is not particularly limited and, for example, one having an etherification degree of about 0.5 to 1.0 is preferable.

  Specific examples of CMC include, for example, serogen 5A, serogen 7A (all are trade names, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., "serogen" is a registered trademark), FINNFIX2, FINNFIX5 (both are trade names, manufactured by CP Kelco, “FINNFIX” is a registered trademark) and the like.

  Since the silica particles, which are the fine particles B described later, are more porous than the inorganic particles having the tabular crystal structure, which are the fine particles A, powder falling from the paper surface is more likely than the inorganic particles having the tabular crystal structure. In consideration of the tendency of occurrence of C., it is desirable to appropriately select and use CMC having a suitable molecular weight, and adjust the amount to, for example, the range described below.

  When CMC is used as the water-soluble resin B, the amount of CMC in the ink receiving layer coating material B is 100 to 500 parts by mass, and further 150 to 350 parts by mass, based on 100 parts by mass of the fine particles B. Is preferred. When the amount of CMC is less than 100 parts by mass, the transfer efficiency of the sublimation-type printing ink to the transfer target is lowered, and there is a possibility that a strike-through problem of the sublimation-type printing ink in the sublimation-type inkjet printing transfer paper may occur. When the amount of CMC exceeds 500 parts by mass, the drying property of the sublimation-type printing ink is deteriorated, and there is a possibility that the sublimation-type printing ink may cause a stain problem during storage.

  In the present invention, PVA can be used as the water-soluble resin B together with CMC. When PVA is used, the type thereof is not particularly limited, and PVA having various saponification degrees and molecular weights can be used, but those having a saponification degree of about 87 to 99 mol% and a number average molecular weight of about 1000 or less are particularly preferable. preferable.

  Specific examples of PVA include, for example, Kuraray Poval PVA110 and Kuraray Poval PVA105, which are exemplified as the water-soluble resin A.

  When PVA is used together with CMC as the water-soluble resin B, the amount of PVA in the ink receiving layer coating material B should be 200 parts by mass or less, and further 100 parts by mass or less based on 100 parts by mass of the fine particles B. Is preferred. By using PVA in this range, it is possible to achieve both excellent dryability of the sublimation-type printing ink and high strike-through prevention property of the sublimation-type printing ink. When the amount of PVA is more than 200 parts by mass, excess PVA coats the surface of the fine particles B to hinder the ink absorption by the fine particles and tends to reduce the drying property of the sublimation printing ink. .

  By using both CMC and PVA as the water-soluble resin B within the above ranges, it is possible to achieve both excellent dryability of the sublimation-type printing ink and strike-through prevention of the high-level sublimation-type printing ink. .

  The fine particles B contained in the ink receiving layer coating material B are at least silica particles.

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

  As the synthetic amorphous silica particles, commercially available products can be preferably used, and examples thereof include Mizukasil P-526, Mizukasil P-801, Mizukasil NP-8, Mizukasil P-802, Mizukasil P-802Y, Mizukasil C-. 212, Mizukasil P-73, Mizukasil P-78A, Mizukasil P-78F, Mizukasil P-87, Mizukasil P-705, Mizukasil P-707, Mizukasil P-707D, Mizukasil P-709, Mizukasil C-402, Mizukasil C-. 484 (above, manufactured by Mizusawa Chemical Co., Ltd.), Tokuseal U, Tokuseal UR, Tokuseal GU, Tokuseal AL-1, Tokuseal GU-N, Tokuseal N, Tokuseal NR, Tokuseal PR, Sorex, Fineseal E-50, Fine seal T-32, Fine seal X-3 , Fineseal X-37, Fineseal X-37B, Fineseal X-45, Fineseal X-60, Fineseal X-70, Fineseal RX-70, Fineseal A, Fineseal B (above, OSC Japan ( Co., Ltd.), Sipernat, Carplex FPS-101, Carplex CS-7, Carplex 80, Carplex 80D, Carplex 67 (above, DSL. Japan Co., Ltd.), Sylysia 350, Sylysia 445, (above) , Fuji Silysia Chemical 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 Gel CY-200, Nip Seal E-150J, D Pushiru 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 at least two kinds of silica particles having different average particle diameters in combination, and in particular, silica particles having an average particle diameter of 2 to 5 μm and silica particles having an average particle diameter of more than 5 μm are combined to obtain fine particles. It is preferably used as B. By using silica particles having different average particle diameters together, the drying property of the sublimation printing ink can be further improved.

  When at least two types of silica particles having different average particle sizes are used in combination, the ratio of silica particles having an average particle size of 2 to 5 μm and silica particles having an average particle size of more than 5 μm (average particle size of 2 to 5 μm The ratio of silica particles / silica particles having an average particle diameter of more than 5 μm is not particularly limited, but is preferably 10/90 to 50/50 in terms of mass ratio of solid content. By setting such a ratio, it is possible to obtain a better sublimation-type printing ink drying property, an image reproducibility on a sublimation-type inkjet printing transfer paper, an image reproducibility on a transfer target, and a higher sublimation-type printing ink transfer. You can get efficiency.

  The particle size of the fine particles B used in the present invention is a solution obtained by adding a small amount of a sample to a methanol solution and dispersing it with an ultrasonic disperser for 3 minutes, by a Coulter counter particle size distribution analyzer (manufactured by COULTER ELECTRONICS INS, TA-II type) with an aperture of 50 μm or 200 μm.

  Other fine particles can be mixed with the silica particles as long as the effects of the present invention are exhibited. 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, hydrated alumina (pseudo-boehmite, etc.), aluminum hydroxide, lithopone, zeolite, hydrohalloysite, inorganic pigments such as magnesium hydroxide, styrene plastic pigment Examples include organic pigments such as acrylic plastic pigments, polyethylene, microcapsules, urea resins, and melamine resins, and these can be used alone or in combination of two or more.

  The content of the fine particles B in the ink receiving layer coating material B is preferably 12.5 to 50 parts by weight, and more preferably 18 to 40 parts by weight with respect to 100 parts by weight of the ink receiving layer coating material B. When the content of the fine particles B is less than 12.5 parts by mass, the amount of sublimation printing ink received is small, and thus the ink drying property tends to be lowered, resulting in stains due to rubbing of the ink and the ink reaching the base paper layer. If reached, problems with cockling (paper waviness resulting from ink shrinkage due to ink absorption) may occur. On the contrary, when the content of the fine particles B exceeds 50 parts by mass, the sublimation type printing ink has a large acceptance amount, but the sublimation efficiency at the time of transfer tends to decrease, and a problem of insufficient density of the transferred image occurs. There is.

  The method for preparing the ink receiving layer coating material B is not particularly limited, but for example, by adding the water-soluble resin B such as CMC or PVA to the fine particle B dispersion slurry, the dispersed state of the fine particles B can be maintained. It can be made into a coating as it is, and a method of mixing and dispersing at about 20 to 45 ° C. can be adopted.

  The solid content concentration of the ink receiving layer coating material B thus obtained is not particularly limited, but due to the characteristics of CMC which is a main component, in order to form a continuous film, the solid content concentration is high and the viscosity is high. However, from the viewpoint that they increase the viscosity of the mixed paint and conflict with the coating workability, it is preferably about 10 to 20% for practical use. When the solid content concentration of the ink receiving layer coating material B is less than 10%, the mixed coating material easily penetrates into the substrate, and it is necessary to increase the coating amount of the mixed coating material in order to obtain a continuous film. The moisture content tends to be too large and dry wrinkles tend to occur. As a result, not only the appearance of the paper is deteriorated, but also heat transfer at the time of ink transfer may be non-uniform due to the 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.

  In the production method of the present invention, the ink receiving layer coating material A is prepared as described above, and the ink receiving layer coating material B is separately prepared as described above, and the ink receiving layer coating material A and the ink receiving layer coating material B are mixed. To prepare a mixed paint.

  Generally, in the printing transfer paper obtained by increasing the silica content in the ink receiving layer coating, the ink drying property is improved at the time of inkjet printing, but at the time of the transfer printing to the transfer target, the ink residue on the printing transfer paper remains. The amount tends to increase. For example, in a paint prepared by a method of adding a water-soluble resin such as CMC after mixing a clay slurry and a silica slurry, which is a usual paint preparation method, the ink drying property is improved as the silica content is increased. However, due to the ink blocking effect of clay, the effect of lowering the ink residual density on the paper surface after sublimation transfer is largely lost. That is, when the ordinary coating material preparation method is adopted, the relationship between the ink drying property and the remaining ink amount is as follows: the inorganic fine particles having the tabular crystal structure in the ink receiving layer coating material A and the silica particles in the ink receiving layer coating material B. Although it can be said that the ink drying property changes almost linearly depending on the ratio, the effect of lowering the ink remaining amount seems to expire sooner.

  However, 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 present invention, the ink drying property is linear depending on the ratio of silica particles in the ink receiving layer coating material B. However, the amount of ink remaining on the sublimation inkjet printing transfer paper decreases, that is, the transfer density increases. That is, the silica particles contained in the ink receiving layer coating material B improve the ink drying property, while the inorganic fine particles having a flat plate crystal structure contained in the ink receiving layer coating material A have a strong effect of reducing the ink remaining amount. it is conceivable that. Although the reason why such an effect is exhibited is not clear, the inventors have prepared the coating materials separately, so that the inorganic fine particles having the tabular crystal structure of the ink receiving layer coating material A and the silica particles of the ink receiving layer coating material B are prepared. However, in each coating material is present in a state of easily exhibiting its respective function, while in the usual coating preparation method, although silica particles easily exhibit their function, the function of the inorganic fine particles having a tabular crystal structure is We think that it is in a state where it is hard to be demonstrated. Therefore, in the method for producing a sublimation type inkjet printing transfer paper of the present invention, the relationship between the ink drying property and the remaining amount of ink is determined by the relationship between the inorganic fine particles having the flat plate crystal structure in the ink receiving layer coating material A and the ink receiving layer coating material B in the ink receiving layer coating material B. Although it changes almost linearly according to the ratio with the silica particles, it is considered that in the ordinary 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 and 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 by mass ratio of solid content, and further, It is preferably 25/75 to 75/25. If the ratio of the two is less than 20/80, the characteristics of the ink-receiving layer coating material A may not be sufficiently exhibited, and the ink residual density on the paper surface may increase. If the ratio of the two exceeds 80/20, the characteristics of the ink receiving layer coating material B may be difficult to exert, and the effect of improving the ink drying property may be insufficient.

  The method for preparing the mixed coating material is not particularly limited, but, for example, the ink receiving layer coating material A and the ink receiving layer coating material B, which are separately prepared by the above method, respectively, are adjusted so that the ratio of both is within the above range, A method of uniformly stirring and mixing at about 20 to 45 ° C can be adopted.

  The solid content concentration of the mixed coating material is not particularly limited, but it is preferably about 10 to 22%, for example, from the viewpoint of easily controlling the coating amount of the mixed coating material by the usual coating method.

  Then, the sublimation type ink jet printing transfer paper of the present invention can be manufactured by applying the mixed coating material to the base material and forming a sublimation type printing ink receiving layer on the base material.

  When applying the mixed paint, the method is not particularly limited, but in order to efficiently achieve the effect of the present invention, the mixed paint prepared as described above, for example, air knife coater, roll coater, bar coater Coating can be performed using a known coating machine such as a comma coater or a blade coater. Among these, the use of an air knife coater suppresses streak generation due to the presence of the fine particles A and the fine particles B acting as a filler, and makes it possible to form a uniform sublimation type printing ink receiving layer by contour coating on a paper surface. It is preferable in terms of formation.

The coating amount of the coating mix (dry) is in the range of 2~12g / ^{m 2,} preferably in the range of 3 to 10 g / ^{m 2.} The mixed paint contains fine particles B, which are inorganic fine particles having a tabular crystal structure, and fine particles B, which are silica particles. The silica particles are typified by hydrophilic secondary clays and deramie clays. Since it is bulkier than the inorganic fine particles having a flat plate crystal structure, it is possible to improve the quality of the sublimation inkjet printing transfer paper of the present invention with a smaller coating amount. If the coating amount of the mixed coating material is less than 2 g / m ² , cockling (waviness) may occur due to the sublimation type printing ink permeating the substrate, or it may be difficult to completely coat the substrate with the mixed coating material. An uncoated portion, that is, a coating defect such as a pinhole occurs, and the reproducibility of an image is deteriorated. If the coating amount of the mixed coating material exceeds 12 g / m ² , the printing and transfer quality of the sublimation type printing ink will be improved by the increase of the coating amount, but at the time of heat transfer at the time of heat transfer, the sublimation type printing ink receiving layer and Since the degree of dimensional change due to the shrinkage of the paper is different from that of the base material, curling and unevenness of the transfer surface occur. As a result, the contact between the cloth and the paper becomes uneven, which causes uneven transfer density. In addition, since the difference in the amount of coating partially increases, the reproducibility of the image decreases.

As described above, the sublimation type inkjet printing transfer paper of the present invention has a sublimation type printing ink receiving layer formed on a base material. Among them, the base material is a hardwood kraft pulp as a main component. On one side of the base material, a sublimation-type printing ink receiving layer is formed, and on the other side of the base material, a resin composition containing a water-soluble resin and containing no filler is water-soluble. It is coated so that the solid content of the functional resin is 0.15 to 3.5 g / m ^2, and the viscosity at 30 ° C. of a 15% solution of CMC contained in the sublimation type printing ink receiving layer is 0. Those having the range of 15 to 1 Pa · s exhibit particularly large effects of the present invention. In addition, containing as said main component means containing 50 mass% or more of the pulp component whole quantity.

  The resin composition applied to the surface (back surface) of the substrate on which the sublimation-type printing ink receiving layer is not formed is a water-soluble resin A used in forming the sublimation-type printing ink receiving layer or a water-soluble resin. It contains the same water-soluble resin as the functional resin B, but does not contain fillers such as the fine particles A and the fine particles B. As a result, it is possible to easily form a coating film of a water-soluble resin with a particularly small coating amount. The water-soluble resin coating on the back side is effective not only for preventing curl at the time of printing and transfer, but also for preventing the contamination of the equipment at the time of printing and transfer due to the sublimation type printing ink coming off to the back side.

The resin composition is preferably applied such that the solid content of the water-soluble resin is 0.15 to 3.5 g / m ² , and further 0.3 to 2.5 g / m ² . As a result, the effect of preventing the contamination of the equipment during printing and transfer due to the ink coming out on the back surface due to the formation of the water-soluble resin film is sufficiently expressed, and the amount of coating is not too large, so that paper is not used more than necessary. It is possible to prevent the unevenness of the paper surface and the tendency of wrinkling, which are caused by the distortion due to the shrinkage of the paper at the time of thermal transfer, and to suppress the occurrence of the transfer density unevenness without making the paper hard.

  Regarding CMC which is the water-soluble resin A and the water-soluble resin B contained in the sublimation type printing ink receiving layer, the viscosity of a 15% solution of the CMC at 30 ° C. is 0.15 to 1 Pa · s, and Is preferably 0.2 to 0.7 Pa · s. As a result, since the viscosity of CMC is low, the phenomenon that the coating film of the sublimation type printing ink receiving layer is torn off is not caused, and no defect occurs in the continuous film. On the contrary, if the viscosity of CMC is too high, coating becomes difficult, and if the solid content is reduced to reduce the viscosity, a drying load is applied, and if it is kept at high temperature for a long time to reduce the viscosity, the film It is also possible to avoid the fact that the formation may be adversely affected.

  Furthermore, in the sublimation type inkjet printing transfer paper of the present invention, an under layer is formed between the sublimation type printing ink receiving layer and the base material, and the under layer contains CMC, so The effect of the invention is greatly exerted.

  Since the under layer containing CMC is formed between the sublimation type printing ink receiving layer and the substrate, it is particularly easy to obtain a pinhole-free continuous coating with a smaller coating amount. Is played.

  The content of CMC in the under layer is not particularly limited, but is preferably about 60 to 100% by mass.

  The under layer coating material for forming the under layer includes, in addition to CMC, starch derivatives such as starch, oxidized starch, cationized starch, etherified starch, phosphoric acid esterified starch, hydroxymethyl cellulose and hydroxyethyl cellulose. , Cellulose derivatives such as cellulose sulfate, PVA with various saponification degrees, silanol modified products thereof, carboxylated products, cationized products, and other PVA derivatives, casein, gelatin, modified gelatin, soybean protein and other water-soluble natural polymer compounds, polyvinyl Pyrrolidone, sodium polyacrylate, styrene-maleic anhydride copolymer sodium salt, water-soluble synthetic polymer compounds such as sodium polystyrene sulfonate may be contained, and the effect of providing an under layer is not impaired. limit There is no particular limitation.

  As described above, the sublimation inkjet printing transfer paper of the present invention comprises CMC, which is a water-soluble resin, and inorganic fine particles having a flat plate crystal structure, which is a filler, in a specific ratio on a substrate having a specific water absorption. A sublimation-type printing ink receiving layer is formed from a mixed coating material containing a coating material containing very small amount of pinholes and a coating material containing CMC, which is a water-soluble resin, and silica particles, which is a filler. ing. Therefore, the sublimation-type inkjet printing transfer paper of the present invention is excellent in the drying property of the sublimation-type printing ink during inkjet printing and, at the time of the transfer-printing onto the transfer target, sublimation to the sublimation-type inkjet printing transfer paper. The remaining amount of the pattern printing ink is small, and it is excellent in the transfer efficiency to the transfer target such as image reproducibility, transfer image resolution, transfer image density level, and uniformity thereof.

  Next, the sublimation type inkjet printing transfer paper of the present invention and the method for producing the same will be described in more detail based on the following examples, but the present invention is not limited to these examples. The number of parts in the blend is the number of solids.

  The components used in each production example, preparation example, example and comparative example are as follows.

(1) Craft pulp and LBKP
Hardwood bleached kraft pulp Freeness (CSF) according to JIS P 8121-2: 530 ml
・ NBKP
Conifer bleached kraft pulp Freeness (CSF) according to JIS P 8121-2: 580 ml

(2) Water-soluble resin A
・ CMC-A1
Serogen 5A (Daiichi Kogyo Seiyaku Co., Ltd.)
・ CMC-A2
FINNFIX2 (made by CP Kelco)
・ PVA-A
Kuraray Poval PVA105 (manufactured by Kuraray Co., Ltd., saponification degree: 98 to 99 mol%,
Degree of polymerization: 500)

(3) Fine particles A
・ Particle-A1
Inorganic fine particles secondary clay having a tabular crystal structure (median diameter d50: 0.7 μm, aspect ratio: 8)
・ Particle-A2
Inorganic fine particles having a tabular crystal structure Deramichela (median diameter d50: 1.4 μm, aspect ratio: 20)
・ Particle-A3
Inorganic fine particles secondary clay having a tabular crystal structure (median diameter d50: 0.4 μm, aspect ratio: 8)

(4) Water-soluble resin B
・ CMC-B1
Serogen 7A (Daiichi Kogyo Seiyaku Co., Ltd.)
・ CMC-B2
FINNFIX5 (made by CP Kelco)
・ PVA-B
Kuraray Poval PVA110 (manufactured by Kuraray Co., Ltd., saponification degree: 98 to 99 mol%,
Polymerization degree: 1000)

(5) Fine particles B
・ Particle-B1
Synthetic amorphous silica particles Carplex 80 (manufactured by DSL Japan Co., Ltd., average particle size: 15.0 μm)
・ Particle-B2
Synthetic amorphous silica particles Fineseal X-37B (manufactured by OSC Japan Co., Ltd., average particle diameter: 3.7 μm)

Production Example 1 (Production of base material)
85% by mass of LBKP and 15% by mass of NBKP were blended, and 0.8 parts by mass of cationized starch and 1 part of alkyl ketene dimer (internally added sizing agent) were used as auxiliary agents with respect to 100 parts by mass of the total amount of kraft pulp. A paper material was prepared by adding 1 part by mass and 0.3 part by mass of anion-modified polyacrylic amide. Kraft paper having a basis weight of 100 g / m ² , Beck smoothness of 100 seconds according to JIS P 8119, and 10 seconds Cobb water absorption of 10 g / m ² according to JIS P 8140 Was manufactured (hereinafter referred to as "base material-1").

Production Examples 2 to 4 (production of base material)
Kraft paper was produced in the same manner as in Production Example 1 except that the amount of the alkyl ketene dimer (internally added sizing agent) was adjusted so that the 10-second Cobb water absorption of the kraft paper was the value shown in Table 1. , Substrate-2 to substrate-4). Table 1 also shows the basis weight and Beck's smoothness of each kraft paper.

Preparation Example 1A (Preparation of Ink Receptive Layer Paint A)
Particles-A1 were used as the fine particles A, and 200 parts by mass of CMC-A1 was used as the water-soluble resin A with respect to 100 parts by mass of the particles-A1. CMC-A1 was added to the dispersion slurry of particles-A1 and mixed to prepare an ink receiving layer coating material A having a solid content concentration of 18.0% (hereinafter referred to as coating material-A1).

Preparation Examples 2A to 7A (Preparation of ink receiving layer coating material A)
An ink receiving layer coating material A having a solid content concentration shown in Table 2 was prepared in the same manner as in Preparation Example 1A except that the composition was changed as shown in Table 2 (hereinafter referred to as coating material-A2 to coating material-A7, respectively). ). Table 2 also shows the content of the fine particles A in each ink receiving layer coating material A.

In addition, the number of pinholes developed in the ink-receiving layer coating material A obtained in Preparation Examples 1A to 7A was examined. That is, by a dropping method using an oil absorption test method based on JIS P 3001 (1976) using n-hexadecane, ink was applied onto the base material-1 so that the coating amount (dry) was 10 g / m ^2. One minute after dropping one drop of n-hexadecane at five different points on the layer A formed by applying the layer coating material A, the surface of the substrate-1 on which the layer A was not formed was dropped at each dropping point. The number of expressed n-hexadecane traces was examined, and the average value of the number of expressed expression at 5 points was calculated. The results are also shown in Table 2.

Preparation Example 1B (Preparation of Ink Receptive Layer Paint B)
Particles-B1 were used as the fine particles B, and 200 parts by mass of CMC-B1 was used as the water-soluble resin B based on 100 parts by mass of the particles-B1. CMC-B1 was added to the dispersion slurry of particles-B1 and mixed to prepare an ink receiving layer coating material B having a solid content concentration of 16.0% (hereinafter referred to as coating material-B1).

Preparation Examples 2B to 7B (Preparation of ink receiving layer coating material B)
An ink receiving layer coating material B having a solid content concentration shown in Table 3 was prepared in the same manner as in Preparation Example 1B except that the composition was changed as shown in Table 3 (hereinafter referred to as coating material-B2 to coating material-B7, respectively). ). In addition, Table 3 also shows the content of the fine particles B in each ink receiving layer coating material B.

Preparation Example 1 (Preparation of mixed paint)
75 parts by mass of paint-A1 and 25 parts by mass of paint-B1 were mixed by stirring so as to have a uniform composition to prepare a mixed paint having a solid content concentration of 17.5% (hereinafter referred to as mixed paint-1). .

Preparation Examples 2 to 15 (preparation of mixed paint)
A mixed paint having a solid content concentration shown in Table 4 was prepared in the same manner as in Preparation Example 1 except that the composition was changed as shown in Table 4 (hereinafter referred to as mixed paint-2 to mixed paint-15, respectively). .

Comparative Preparation Example 1 (Preparation of Comparative Paint)
75 parts by mass of Particle-A1 and 25 parts by mass of Particle-B1 were used as the fine particles, and 150 parts by mass of CMC-A1 and 50 parts by mass of CMC-B1 were used as the water-soluble resin. After preparing the dispersion slurry of particle-A1 and the dispersion slurry of particle-B1, respectively, the dispersion slurry of particle-B1 is added to the dispersion slurry of particle-A1, and further CMC-A1 and CMC-B1 are added and mixed. Then, a comparative paint having a solid content concentration of 17.5% was prepared (hereinafter referred to as comparative paint-1).

Comparative Preparation Example 2 (Preparation of Comparative Paint)
The same as Comparative Preparation Example 1 except that 50 parts by mass of particles-A1 and 50 parts by mass of particles-B1 were used as the fine particles, and 100 parts by mass of CMC-A1 and 100 parts by mass of CMC-B1 were used as the water-soluble resin. Then, a comparative paint having a solid content concentration of 17.0% was prepared (hereinafter referred to as comparative paint-2).

Comparative Preparation Example 3 (Preparation of Comparative Paint)
The same as Comparative Preparation Example 1 except that 25 parts by mass of particles-A1 and 75 parts by mass of particles-B1 were used as the fine particles, and 50 parts by mass of CMC-A1 and 150 parts by mass of CMC-B1 were used as the water-soluble resin. Then, a comparative paint having a solid content concentration of 16.5% was prepared (hereinafter referred to as comparative paint-3).

Example 1 (Manufacture of sublimation type inkjet printing transfer paper)
Using an air knife coater, apply the mixed paint-1 on one surface of the base material-1 so that the coating amount (dry) is 8 g / m ² , and dry at about 130 ° C. to receive the sublimation type printing ink. The layers were formed to produce a sublimation inkjet printing transfer paper.

Examples 2 to 18 and Comparative Examples 1 to 9 (production of sublimation type inkjet printing transfer paper)
A sublimation inkjet printing transfer paper was produced in the same manner as in Example 1 except that the types of the base material and the coating material, and the coating amount (drying amount) of the coating material were changed as shown in Table 5. In Examples 17 and 18 and Comparative Example 8, an air knife coater was used to apply the underlayer coating material on one surface of the base material at the coating amount (drying) shown in Table 5 and dry at about 130 ° C. After forming the under layer, the mixed paint shown in Table 5 was applied onto the under layer. As the under layer coating material, the same coating material as the ink receiving layer coating material A used in the mixed coating material was used.

Test Example The characteristics of the obtained sublimation type inkjet printing transfer paper were examined according to the following methods. The results are shown in Table 6.

  Inkjet recording evaluation was performed using an inkjet printer (Seiko Epson Corp., EP407A type) and a sublimation type printing ink (Power System Co., Ltd., EPSON sublimation ink SU-110 series), “plain paper + clean”. The image for each evaluation was printed in the setting mode of ". A polyester cloth material was used as the transferred material. The image transfer was performed by bringing the image printed by an inkjet printer on a sublimation type inkjet printing transfer paper and a polyester cloth material into close contact with each other, and holding at 190 ° C. for 90 seconds to perform thermal transfer.

(1) Ink drying property Immediately after black solid printing on each sublimation type inkjet printing transfer paper with an inkjet printer, when the printed surface is rubbed with a tissue paper and wiped off, it is visually confirmed whether the ink spreads on the paper surface. Then, the evaluation was made based on the following evaluation criteria. In addition, the evaluation of 3 or higher is the practical level.
(Evaluation criteria)
5: Drying was very fast, and ink was not spread on the paper surface after wiping.
4: Drying is quick, and ink is hardly spread on the paper surface after wiping.
3: Drying was slightly slow, and ink was slightly spread on the paper surface after wiping, but there was no problem in practical use.
2: Drying was slow, and ink spread was observed on the paper surface after wiping.
1: Drying was very slow, stains on the device and stains on the printing portion were recognized, and the ink spreads on the paper surface after wiping for a long time, making it unusable.

(2) Remaining amount of ink Solid printing of 100% red + 100% yellow was performed on each sublimation type inkjet printing transfer paper by an inkjet printer, and held at 190 ° C for 90 seconds for thermal transfer to a polyester cloth material. Then, the density of the ink remaining on the sublimation type inkjet printing transfer paper and the transfer density to the cloth material were examined and evaluated based on the following evaluation criteria. In addition, the evaluation of 3 or higher is the practical level.
(Evaluation criteria)
5: Only a small amount of ink remains on the paper surface, and the transfer density to the cloth material is high.
4: Ink remains on the paper surface, but there is almost no effect on the transfer density to the cloth material.
3: The density of the ink remaining on the paper surface is a little high, but the transfer density to the cloth material is slightly lower than that in "Evaluation 4", and there is no problem in practical use.
2: The ink remaining on the paper surface has a high density, and the transfer density onto the cloth material is also significantly lower than in “Evaluation 3”.
1: The density of the ink remaining on the paper surface is considerably high, and the transfer density to the cloth material is obviously low when viewed alone.

(3) Image Density Reproducibility The image density reproducibility of each sublimation type inkjet printing transfer paper of a digital image was visually observed and evaluated based on the following evaluation criteria. In addition, the evaluation of 3 or higher is the practical level.
(Evaluation criteria)
5: No difference in density from the original plate is observed, and image density reproducibility is excellent.
4: Almost no difference in density from the original plate was observed, and image density reproducibility was good.
3: A slight difference in density from the original plate was recognized, and the image density reproducibility was slightly inferior, but there was no practical problem.
2: Many density differences from the original plate were observed, the image density reproducibility was poor, and it was unusable.
1: The density was remarkably different from that of the original plate, and there was almost no reproducibility of the image density, and the image could not be used.

(4) Image density unevenness Solid printing of red 100% + yellow 100% is performed on each sublimation type inkjet printing transfer paper with an inkjet printer, and the sublimation type inkjet printing transfer paper, polyester cloth material and felt base cloth are overlaid in this order, The felt base cloth was notched and cut to make the heat transfer non-uniform, and then the felt base cloth was held at 190 ° C. for 15 seconds for thermal transfer to the cloth material. After that, the presence or absence of shading of the transferred image on the cloth material was confirmed at the position corresponding to the cut damage of the felt base cloth, and the evaluation was made based on the following evaluation criteria. In addition, the evaluation of 3 or higher is the practical level.
(Evaluation criteria)
5: No influence of cut scratches is observed.
4: A slightly thin afterimage can be seen in the deep scratches, but no afterimage can be seen in the shallow scratches.
3: The shape can be almost understood in the deep scratches and the thin shape can be confirmed even in the shallow scratches, but there is no practical problem.
2: The shape can be seen not only in the deep scratches but also in the shallow scratches.
1: The cut scratch appears as a distinct shade, and the shape can be clearly seen even in the shallow part of the scratch.

The sublimation-type inkjet printing transfer papers of Examples 1 to 18 were obtained by forming a sublimation-type printing ink receiving layer on a base material having a 10-second Cobb water absorption of 5 to 20 g / m ² , and this sublimation-type printing ink was used. The receiving layer contains water-soluble resin A, CMC, and fine particles A, which act as a filler, and inorganic fine particles having a tabular crystal structure in a specific ratio, and the average pinhole expression is 5 or less. And the ink receiving layer coating B containing CMC which is a water-soluble resin B and silica particles which are fine particles B acting as a filler.

  Therefore, the sublimation-type inkjet printing transfer papers of Examples 1 to 18 are excellent in ink drying property during inkjet printing, and have a small amount of ink remaining on the printing transfer paper during transfer printing onto the transferred material. Transfer density is high, image density reproducibility is excellent, and unevenness in image density is small. That is, the sublimation type inkjet printing transfer papers of Examples 1 to 18 are all capable of satisfying the practical level, and have excellent characteristics that the total evaluation is 14 or more.

In Examples 17 and 18, since the underlayer containing CMC was formed between the sublimation type printing ink receiving layer and the substrate, the coating amount of the mixed coating material was 5 g / m ² , 2 g / m ² . although m ² and relatively small, coating coated amount has the same excellent properties as in the case of 8 g / m ^2.

  On the other hand, in the sublimation-type inkjet printing transfer paper of Comparative Example 1, since the sublimation-type printing ink receiving layer is formed only from the ink receiving layer coating material A, the ink remaining amount on the printing transfer paper is small, and the transferred material is not transferred. Although the transfer density to the material is high, the ink drying property is very poor. Further, although the image density reproducibility is excellent, the unevenness in image density is very large.

  In the sublimation type inkjet printing transfer paper of Comparative Example 2, since the sublimation type printing ink receiving layer is formed only from the ink receiving layer coating material B, the ink drying property is excellent, but the ink remaining amount on the printing transfer paper is very high. However, the transfer density to the transferred material is also very low. Further, although the image density unevenness is small, the image density reproducibility is very poor.

  The sublimation-type inkjet printing transfer papers of Comparative Examples 3 to 5 were not mixed paints prepared by mixing two kinds of paints prepared separately, but were mixed with two kinds of fine particle slurries before mixing with a water-soluble resin. Since the sublimation-type textile printing ink receiving layer is formed from the coating material prepared by the above method, the ink drying property is poor, the image density unevenness is large (Comparative Example 3), the remaining amount of the ink is large, and the transfer density to the transfer target is also high. It is low (Comparative Example 4), the remaining amount of ink is very large, the transfer density to the transferred material is very low, and the image density reproducibility is also poor (Comparative Example 5).

In the sublimation type inkjet printing transfer papers of Comparative Examples 6 and 7, since the 10 second Cobb water absorption of the substrate is less than 5 g / m ² (Comparative Example 6) or exceeds 20 g / m ² (Comparative Example 7), Large amount of remaining ink, low transfer density to transferred material, poor image density reproducibility, large image density unevenness (Comparative Example 6), poor ink drying property, large remaining ink amount, transferred material The transfer density to the image is low, the image density reproducibility is poor, and the unevenness of image density is large (Comparative Example 7).

In the sublimation inkjet printing transfer papers of Comparative Examples 8 and 9, since the coating amount of the ink receiving layer coating material is less than 2 g / m ² (Comparative Example 8) or exceeds 12 g / m ² (Comparative Example 9), The ink dryness is very poor, the ink remaining amount is very large, the transfer density to the transferred material is also very low, and the image density reproducibility is very poor (Comparative Example 8). In many cases, the transfer density to the transferred material is also very low, and the image density reproducibility is very poor (Comparative Example 9).

  The sublimation-type inkjet printing transfer paper of the present invention is particularly suitable for an inkjet recording system in which printing is performed using a sublimation-type printing ink in an inkjet printer.

Claims (3)

A method of manufacturing a sublimation type ink jet printing transfer paper is sublimation textile ink-receiving layer on the substrate is formed ing,
A step of preparing an ink receiving layer coating material A from at least a water-soluble resin A and fine particles A;
A step of preparing an ink receiving layer coating material B from at least a water-soluble resin B and fine particles B;
Mixing the ink receiving layer coating material A and the ink receiving layer coating material B to prepare a mixed coating material;
A step of applying the mixed coating material on a base material and forming a sublimation type printing ink receiving layer on the base material,
The substrate has a 10 second Cobb water absorption of 5 to 20 g / m ² according to JIS P 8140,
Prior Symbol ink-receiving layer coating A,
The water-soluble resin A is at least carboxymethylcellulose sodium, the ink receiving layer coating A, are contained in a proportion of 100 to 400 parts by weight with respect to carboxymethyl cellulose sodium is the fine particle A100 parts by weight
The fine particles A are at least inorganic fine particles having a tabular crystal structure,
The inorganic fine particles having a tabular crystal structure have a median diameter d50 in the range of 0.4 to 2.3 μm and an aspect ratio of 5 to 30,
By using a dropping method by an oil absorption test method based on JIS P 3001 (1976) using n-hexadecane, five different positions on a layer A formed from the ink receiving layer coating material A on the base material are used. , 1 minute after each dropwise addition of n-hexadecane, expression at 5 locations based on the number of expressed n-hexadecane traces that appeared on the surface of the base material on which the layer A was not formed at each dropping location The average number is 5 or less,
In the ink receiving layer coating material B,
The water-soluble resin B is at least sodium carboxymethyl cellulose,
The fine particles B are at least silica particles,
The coating amount (drying amount) of the mixed coating material is ² to 12 g / m ² , and the method for producing a sublimation type inkjet textile transfer paper. The method for producing a sublimation-type inkjet printing transfer paper according to claim 1, wherein carboxymethylcellulose sodium is contained in the ink receiving layer coating material B in a proportion of 100 to 500 parts by mass with respect to 100 parts by mass of the fine particles B. The ink receiving layer coating material A and the ink receiving layer coating material B are mixed at a mass ratio of 20/80 to 80/20 (ink receiving layer coating material A / ink receiving layer coating material B) to prepare a mixed coating material. preparing method of sublimation type ink jet printing transfer paper according to claim 1 or 2.