JP6765345B2 - Transfer paper - Google Patents

Description

The present invention relates to a transfer paper used for transferring a pattern in a transfer printing method for forming a pattern on a printed matter such as a textile material.

As a method of forming a pattern on a printed matter such as a textile material, a pattern is printed on a transfer paper using a sublimation type printing ink to prepare a transfer paper, and the transfer paper is brought into close contact with the printed matter to obtain a sublimation type printing ink. A transfer printing method for transferring to a printed matter is known (see, for example, Patent Document 1 and Patent Document 2).

The transfer paper used for the transfer printing method is known.
For sublimation transfer, which is used in sublimation transfer printing systems, has excellent water-based ink absorbency, can obtain clear recorded images without bleeding, and has excellent ink transfer efficiency to transfer objects during sublimation transfer. The sheet includes a sheet-like base material and an ink receiving layer provided on one side or both sides of the sheet-shaped base material, and the ink receiving layer contains a pigment, a binder, and a cationic resin, and serves as a pigment. Is known as a transfer paper characterized in that precipitation method silica is used, and as the binder, any one of starch, starch derivative, polyvinyl alcohol, modified polyvinyl alcohol, or a mixture of two or more thereof is used. (See, for example, Patent Document 3).

As a method for producing a transfer paper by printing a pattern on a transfer paper using an ink containing a sublimation type dye or a sublimation type printing ink, an inkjet printing method is often used as described in Patent Document 3.

JP 2015-168705 JP-A-2015-124324 Japanese Unexamined Patent Publication No. 2010-158875

It is necessary to have two contradictory characteristics between the transfer paper, which is a blank sheet before the pattern is printed, and the transfer paper obtained by printing the pattern on the transfer paper. That is, the transfer paper is required to have the ability to successfully receive the sublimation type printing ink, and the transfer paper is required to have the ability to successfully transfer the sublimation type printing ink to the printed matter.
Since the transfer paper is a transfer paper having a sharp image so that the image quality of the pattern formed on the printed matter is not deteriorated, it is necessary to improve the receptivity to the sublimation type printing ink. Further, the transfer paper needs not to deteriorate the image quality of the pattern formed on the printed matter from the transfer paper having a sharp image.
On the other hand, if the receptivity of the transfer paper to the sublimation type printing ink is improved, the transfer of the sublimation type printing ink may be insufficient at the time of transfer for forming a pattern on the printed matter. As a result, the color development property of the printed matter is lowered.

Further, in order to transfer the sublimation type printing ink from the transfer paper to the printed matter satisfactorily, the transfer paper needs to receive the sublimation type printing ink without penetrating deep into the paper. That is, the transfer paper is required to suppress strike-through. "Bleet-through" is a phenomenon in which the sublimation-type printing ink of an image printed on transfer paper penetrates deep into the paper.

In addition, there is a problem of transferability when the sublimation type printing ink is transferred from the transfer paper to the printed matter. The transfer is performed by bringing the transfer paper and the printed matter into close contact with each other and heating and pressurizing them as necessary. When forming an image on a printed matter as a work, it is desirable that the transfer of the sublimation type printing ink is saturated with lower heating and lower pressure for a shorter period of time. Such transfer efficiency is referred to as transferability in the present invention. In particular, time is important as a business.

The quality of the sublimation transfer sheet of Patent Document 3 is not always sufficient, and in particular, improvement in suppression of strike-through and transferability is desired.
The ink transfer efficiency described in Patent Document 3 is a value determined from the amount of sublimation type printing ink remaining on the transfer paper. The ink transfer efficiency to the printed matter increases as the amount of sublimation-type printing ink remaining on the transfer paper after the transfer is completed. By transferring more sublimation type printing ink to the printed matter, the color development of the image transferred to the printed matter is improved. That is, the ink transfer efficiency of Patent Document 3 is close to the color development property of the present invention and different from the transfer property of the present invention.

In view of the above, an object of the present invention is to provide a transfer paper that satisfies the following items.
(1) Image deterioration is suppressed in the printed matter (image deterioration resistance)
(2) Suppression of deterioration of color development in the printed matter (color development)
(3) Suppressing strike-through in transfer paper (through-through resistance)
(4) Excellent efficiency in transfer from transfer paper to printed matter (transferability)

As a result of diligent research to solve the above problems, the present inventors achieve the object of the present invention as follows.

[1] The base paper has one or more coating layers on at least one side of the base paper, and the outermost coating layer located on the outermost side with respect to the base paper contains at least a pigment and a binder, and the base paper. A transfer paper used in a transfer printing method using a sublimation type printing ink in which at least one of the fillers contained in is calcined kaolin.

[2] The transfer paper according to the above [1], wherein the base paper is acid paper.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a transfer paper having good image deterioration resistance, color development property, strike-through resistance and transferability.

The present invention will be described in detail below.
In the present invention, the "transfer paper" refers to a paper that is in a blank state before the pattern to be transferred is printed. The “transfer paper” refers to a paper in which a pattern to be transferred is printed on the transfer paper.
Further, in the present invention, "having a coating layer" refers to a paper having a clear layer that can be distinguished from the base paper when the cross section of the transfer paper is observed with an electron microscope. For example, a resin component or a polymer component is coated, and a small amount of the coated component is absorbed by the base paper, and as a result, a clear layer that can be distinguished from the base paper when the cross section of the transfer paper is observed with an electron microscope. If it does not have, it does not correspond to "having a coating layer".

The transfer paper has a base paper and one or more coating layers on at least one side of the base paper. Of the coating layers, the coating layer located on the outermost side of the base paper is called the outermost coating layer. When there is only one coating layer, the coating layer is the outermost coating layer.
The outermost coating layer contains at least a pigment and a binder. When there are two or more coating layers, the coating layer existing between the base paper and the outermost coating layer is either a coating layer containing a pigment and a binder or a coating layer containing no pigment. The type of pigment or binder is not particularly limited.
From the viewpoint of manufacturing cost, one coating layer is preferable. Further, the coating layer may be provided on one side or both sides of the base paper. When the outermost coating layer according to the present invention is provided on one side of the base paper, the transfer paper may have a conventionally known backcoat layer on the back surface of the base paper.

The amount of coating of the coating layer is not particularly limited. From the viewpoint of production cost and ease of handling of the transfer paper, the coating weight is preferably 2 g / m ² or more 70 g / m ² or less per side dry solid content. The upper limit is more preferably 30 g / ^{m 2} or less of coating weight, 20 g / ^{m 2} or less is more preferred. Further, from the viewpoint of reducing the manufacturing cost and preventing the coating layer from being missing when the printed matter and the transfer paper are in close contact with each other, the coating amount is most preferably 5 g / m ² or more and 15 g / m ² or less per side. The coating amount is the total value when there are a plurality of coating layers per one side.

The base paper is chemical pulp such as LBKP (Leaf Bleached Kraft Pulp) and NBKP (Needle Bleached Kraft Pulp), GP (Groundwood Pulp), PGW (Pressure GroundWood pulp), RMP (Refiner Mechanical Pulp), TMP (ThermoMechanical Pulp), CTMP. (ChemiThermoMechanical Pulp), CMP (ChemiMechanical Pulp), mechanical pulp such as CGP (ChemiGroundwood Pulp), and at least one pulp selected from waste paper pulp such as DIP (DeInked Pulp), calcium carbonate, talc, clay, kaolin and It is a pulped paper made by blending various fillers such as calcined kaolin and various additives such as sizing agent, fixing agent, yield agent, cationizing agent and paper strength agent as needed. Further, the base paper includes high-quality paper obtained by subjecting papermaking to calendar treatment, surface size treatment with starch, polyvinyl alcohol, or the like, or surface treatment. Further, the base paper includes high-quality paper that has been subjected to surface size treatment or surface treatment and then calendar-treated.

The base paper of the present invention contains a filler, and at least one of the fillers is calcined kaolin.
The content of calcined kaolin in the base paper is preferably 10 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of pulp in the base paper. When the content of the calcined kaolin is in the above range, the image deterioration resistance or the transferability becomes better.

The calcined kaolin can be obtained by various production methods. The calcined kaolin of the present invention does not limit the production method. Calcined kaolin can be roughly divided into partially calcined kaolin obtained by calcining kaolinite at a temperature of about 650 ° C to 700 ° C and fully calcined kaolin obtained by calcining kaolinite at 1000 ° C to 150 ° C. It may be.

Papermaking is performed using a conventionally known paper machine by adjusting the paper material to acidic, neutral or alkaline. Examples of the paper machine include a long net paper machine, a twin wire paper machine, a combination paper machine, a circular net paper machine, a Yankee paper machine, and the like.

The base paper of the present invention is preferably acid paper.
Acid paper means that the pH of the cold water extract measured according to the method based on "Paper, Paperboard and Pulp-Test Method for pH of Water Extract-Part 1: Cold Water Extraction" (JIS P 8133-1: 2013) is 6 Refers to base paper that is less than. The lower limit of pH is preferably 4.5 or more from the viewpoint of paper deterioration. The reason for this is that the transferability is improved by the synergistic effect of the base paper, which is acid paper, the calcined kaolin in the base paper, and the outermost coating layer.

The basis weight of the base paper is not particularly limited. From the viewpoint of ease of handling of the paper, the basis weight of the base paper is preferably 10 g / m ² or more and 100 g / m ² or less, and more preferably 30 g / m ² or more and 100 g / m ² or less. Further, the thickness of the transfer paper is not particularly limited. From the viewpoint of ease of handling for transfer to a printed matter, the thickness of the transfer paper is preferably 0.01 mm or more and 0.5 mm or less, and more preferably 0.05 mm or more and 0.3 mm or less.

Other additives such as binders, pigment dispersants, thickeners, fluidity improvers, defoamers, defoaming agents, mold release agents, foaming agents, penetrants, coloring dyes, coloring pigments, etc. One or more selected from fluorescent whitening agents, ultraviolet absorbers, antioxidants, preservatives, antifoaming agents, water resistant agents, wet paper strength enhancers, dry paper strength enhancers, etc., according to the present invention. It can be appropriately blended as long as the desired effect is not impaired.

The coating layer can be provided on the base paper or the coating layer by coating and drying the coating layer coating liquid on the base paper or the coating layer.
The method of providing the coating layer is not particularly limited. For example, a method of coating and drying using a coating device and a drying device conventionally known in the papermaking field can be mentioned. Examples of the coating device include a size press, a gate roll coater, a film transfer coater, a blade coater, a rod coater, an air knife coater, a comma coater, a gravure coater, a bar coater, an E bar coater, a curtain coater and the like. Examples of the drying device include a straight tunnel dryer, an arch dryer, an air loop dryer, a hot air dryer such as a sine curve air float dryer, an infrared heating dryer, a dryer using microwaves, and the like.

The pigment of the outermost coating layer is a conventionally known pigment. Conventionally known pigments include, for example, various kaolin, heavy calcium carbonate, light calcium carbonate, talc, satin white, lithopone, titanium oxide, zinc oxide, amorphous silica, colloidal silica, alumina, aluminum hydroxide, zinc oxide, and the like. Examples thereof include inorganic pigments such as active white clay and diatomaceous clay, and organic pigments such as plastic pigments. The outermost coating layer may contain one or a combination of two or more selected from the group consisting of these pigments.

The binder of the outermost coating layer is a conventionally known binder. Conventionally known binders include, for example, starch and various modified starches thereof; cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose; natural polymer resins such as casein, gelatin, soybean protein, purulan, arabic rubber, Karaya rubber, and albumin or derivatives thereof; Polyvinylpyrrolidone; polyvinyl alcohol and various modified polyvinyl alcohols thereof; polypropylene glycol; polyethylene glycol; maleic anhydride resin; acrylic resin; ethylene-vinyl acetate copolymer, methacrylic acid ester-butadiene copolymer, styrene-butadiene copolymer Alternatively, a functional group-modified copolymer using a functional group-containing monomer such as a carboxy group of these various copolymers; a binder such as a heat-curable synthetic resin such as a melamine resin or a urea resin; a polyurethane resin; an unsaturated polyester resin; Butyral; Alkid resin and the like can be mentioned. The outermost coating layer contains one or a combination of two or more selected from the group consisting of these binders. The binder is preferably a combination of starch and various modified starches thereof and an ethylene-vinyl acetate copolymer, or a combination of polyvinyl alcohol and various modified polyvinyl alcohols thereof and an ethylene-vinyl acetate copolymer. The reason for this is that the adhesion between the transfer paper and the printed matter is improved.

In the outermost coating layer, it is preferable that at least one of the pigments is amorphous silica. The reason why amorphous silica is preferable is that it improves image deterioration resistance or color development.
Amorphous silica can be roughly classified into wet silica and vapor phase silica depending on the production method. Further, wet silica can be classified into sedimentation silica and gel silica depending on the production method. Sedimentation method silica is produced by reacting sodium silicate and sulfuric acid under alkaline conditions, and the silica particles that have grown particles are aggregated and settled, and then filtered, washed with water, dried, crushed, and classified. Precipitated silica is commercially available, for example, as a nip seal from Tosoh Silica, and as a fine seal and a tox seal from OSC. Gel silica is produced by reacting sodium silicate and sulfuric acid under acidic conditions. During aging, the microparticles dissolve and reprecipitate to bond the other primary particles, so that the distinct primary particles disappear and form relatively hard aggregated particles with an internal void structure. Gel method silica is commercially available, for example, as a nip gel from Tosoh Silica and as a siloid or silo jet from Grace Japan. Gas phase silica is also called a dry method as opposed to a wet method, and is generally produced by a flame hydrolysis method. Specifically, a method of burning silicon tetrachloride together with hydrogen and oxygen is generally known. Instead of silicon tetrachloride, silanes such as methyltrichlorosilane and trichlorosilane can be used alone or in combination with silicon tetrachloride. Gas phase silica is commercially available as Aerosil from Nippon Aerosil and Leolosil from Tokuyama.
As the amorphous silica, sedimentation silica is preferable.

The total content ratio of the pigment and the binder in the outermost coating layer is preferably 60% by mass or more in terms of the dry solid content of the outermost coating layer. The content ratio of the binder in the outermost coating layer is preferably 20 parts by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the pigment in the outermost coating layer.
The content ratio of amorphous silica in the outermost coating layer is preferably 80 parts by mass or more with respect to 100 parts by mass of the pigment in the outermost coating layer.

In addition to the pigment and the binder, the outermost coating layer can contain various additives conventionally known in the field of coated paper, if necessary. Examples of additives include dispersants, fixers, cationizers, thickeners, fluidity improvers, defoamers, mold release agents, foaming agents, penetrants, color pigments, color dyes, optical brighteners. , Ultraviolet absorbers, antioxidants, preservatives, antibacterial agents and the like.
In addition, the outermost coating layer can contain various conventionally known auxiliaries by the transfer printing method. Auxiliary agents are added to optimize various physical properties of the outermost coating layer coating liquid, or to improve the dyeability of the transferred sublimation type printing ink. Examples of the auxiliary agent include various surfactants, moisturizers, wetting agents, pH adjusting agents, alkaline agents, darkening agents, degassing agents, anti-reduction agents and the like.

The outermost coating layer preferably contains a cationic resin.
The cationic resin may be any conventionally known cationic polymer or cationic oligomer, and is not particularly limited. Preferred cationic resins are polymers or oligomers containing primary to tertiary amines or quaternary ammonium salts that are easily coordinated with protons and dissociate when dissolved in water to exhibit cationic properties. Examples of cationic resins include polyethyleneimine, polyvinylpyridine, polyaminesulfone, polydialkylaminoethyl methacrylate, polydialkylaminoethyl acrylate, polydialkylaminoethylmethacrylate, polydialkylaminoethylacrylamide, polyepoxyamine, polyamideamine, dicyandiamide. -Formalin polycondensate, dicyandiamide polyalkyl-polyalkylene polyamine polycondensate, polyvinylamine, polyallylamine and other compounds and their hydrochlorides, as well as diallylamine-acrylamide copolymers, polydialyldimethylammonium chloride and diallyldimethylammonium chloride. Examples include copolymers with acrylamide, polydialylmethylamine hydrochloride, dimethylamine-ammonia-epicrolhydrin polycondensate, polycondensate of alkylamine and epihalohydrin compound such as dimethylamine-epichlorohydrin polycondensate. it can. The cationic resin is one or more selected from the group consisting of these.
The cationic resin is preferably one or more selected from the group consisting of a polycondensate of an alkylamine and an epihalohydrin compound, a diallylamine-acrylamide copolymer, and polydiallyldimethylammonium chloride.

The content of the cationic resin in the outermost coating layer is preferably 15 parts by mass or more and 35 parts by mass or less with respect to 100 parts by mass of the pigment in the outermost coating layer.
The reason for containing the cationic resin is that the image deterioration resistance becomes better.

The transfer paper can be obtained by printing a pattern on the surface side of the transfer paper having the outermost coating layer by using various conventionally known printing methods including a sublimation type printing ink.
Various printing methods for printing a pattern on transfer paper are conventionally known printing methods and are not particularly limited. Examples of the printing method include a gravure printing method, an inkjet printing method, an electrophotographic printing method, and a screen printing method. Above all, the inkjet printing method is preferable in terms of high definition of image quality and miniaturization of the apparatus.

The transfer printing method using a sublimation type printing ink is a method having a step of printing a pattern on the transfer paper to obtain the transfer paper and a step of bringing the transfer paper into close contact with the printed matter. The process of close contact includes heating and pressurization, if necessary. The conditions of heating and pressurization in the step of bringing them into close contact are the conditions conventionally known in the transfer printing method. Examples of the step of bringing the transfer paper into close contact with the printed matter include a method of bringing the transfer paper into close contact with the printed matter by a press machine, a heating drum, or the like to heat and pressurize the printed matter.

The printed matter is a fiber material and is not particularly limited. The fiber material may be either a natural fiber material or a synthetic fiber material. Examples of the natural fiber material include cellulosic fiber materials such as cotton, hemp, lyocell, rayon and acetate, and protein fiber materials such as silk, wool and animal hair. Examples of the synthetic fiber material include polyamide fiber (nylon), vinylon, polysell, and polyacrylic. Examples of the composition of the fiber material include woven fabrics, knitted fabrics, non-woven fabrics and the like alone, blended fabrics, mixed fibers or mixed weaves. Further, these configurations may be compounded. Further, if necessary, the printed matter may be pretreated with a chemical or the like effective in promoting dyeing.
In the transfer printing method using a sublimation type printing ink, a synthetic fiber material is preferable as the printed matter. Natural fiber materials often require pretreatment.

Hereinafter, the present invention will be described in more detail by way of examples. The present invention is not limited to these examples. Here, "parts by mass" and "% by mass" represent "parts by mass" and "% by mass" of the amount of dry solids or the amount of substantial components, respectively. The coating amount of the coating layer represents the amount of dry solid content.

<Base paper 1>
100 parts by mass of wood pulp consisting of 90 parts by mass of LBKP with a drainage degree of 450 ml CSF and 10 parts by mass of NBKP with a drainage degree of 440 ml CSF, 12 parts by mass of calcined kaolin (BASF, Ansilex), and oxidized starch (MS3800, Japan Food Processing Co., Ltd.) 4 Add parts by mass, 0.3 parts by mass of rosin sizing agent, 0.6 parts by mass of polyacrylamide resin, and 0.5 parts by mass of sulfuric acid band so that the pH of the obtained base paper is 4.5 or more and less than 6. The pH of the material was adjusted. After adjusting the paper material, a paper machine was used to make a paper with a basis weight of 100 g / m ² , and a base paper 1 was obtained.

<Base paper 2>
In the base paper 1, the same procedure was carried out except that heavy calcium carbonate (HYDROCARB90, Shiraishi Calcium Co., Ltd.) was used instead of calcined kaolin to obtain base paper 2.

<Base paper 3>
In the base paper 1, the same procedure was carried out except that talc (Talc Japan, SG-200N15) was used instead of calcined kaolin to obtain base paper 3.

<Base paper 4>
In the base paper 1, the same procedure was carried out except that kaolin (Shiraishi Calcium Co., Ltd., Kaolin 90) was used instead of calcined kaolin to obtain base paper 4.

<Base paper 5>
In the base paper 1, the same procedure was carried out except that amorphous silica (Mizusawa Industrial Chemicals Co., Ltd., Mizukasil P527) was used instead of calcined kaolin to obtain base paper 5.

<Base paper 6>
In the base paper 1, the same procedure was carried out except that the blending amount of calcined kaolin was changed from 12 parts by mass to 5 parts by mass to obtain base paper 6.

<Base paper 7>
In the base paper 1, the same procedure was carried out except that the blending amount of calcined kaolin was changed from 12 parts by mass to 10 parts by mass to obtain base paper 7.

<Base paper 8>
In the base paper 1, the same procedure was carried out except that the blending amount of calcined kaolin was changed from 12 parts by mass to 20 parts by mass to obtain base paper 8.

<Base paper 9>
In the base paper 1, the same procedure was carried out except that the blending amount of calcined kaolin was changed from 12 parts by mass to 30 parts by mass to obtain base paper 9.

<Base paper 10>
In the base paper 1, the same procedure was carried out except that the pH of the paper material was adjusted so that the pH of the obtained base paper was 6.5 or more and 8 or less, to obtain the base paper 10.

<Base paper 11>
In the base paper 1, the same procedure was carried out except that the pH of the paper material was adjusted so that the pH of the obtained base paper was 10 or more and 11 or less, to obtain the base paper 11.

<Base paper 12>
In the base paper 1, 12 parts by mass of calcined kaolin was changed to 10 parts by mass of calcined kaolin (BASF, Ansilex) and 2 parts by mass of heavy calcium carbonate (HYDROCARB90, Shiraishi Calcium). Got

<Base paper 13>
Similarly, in the base paper 1, 12 parts by mass of calcined kaolin is changed to 7.5 parts by mass of calcined kaolin (BASF, Ancilex) and 4.5 parts by mass of heavy calcium carbonate (HYDROCARB90, Shiraishi Calcium). This was done to obtain base paper 13.

<Outermost coating layer coating liquid>
In water, 100 parts by mass of amorphous silica (OSC, Fineseal X-37B), 20 parts by mass of silanol-modified polyvinyl alcohol (Kuraray, R-1130), ethylene-vinyl acetate emulsion (Kuraray, Panflex OM6000) 10 parts by mass and 20 parts by mass of a cationic resin (Taoka Chemical Industry, Sumiretz Resin 1001) were blended, and the coating liquid concentration was adjusted to 13% by mass.

<Coating layer coating liquid>
The coating layer coating liquid is a coating liquid related to a coating layer provided between the outermost coating layer and the base paper.
100 parts by mass of light calcium carbonate (Shiraishi Calcium, Brilliant-15) and 20 parts by mass of styrene-butadiene copolymer (JSR, JSR-2605G) are mixed in water to adjust the coating liquid concentration to 13% by mass. did.

<Transfer Papers of Examples 1 to 9 and Comparative Examples 1 to 4>
The outermost coating layer coating liquid was coated on one side of the base paper with an air knife coater so that the coating amount was 9 g / m ^2, and dried with a hot air dryer. Then, a super calendar process was performed to obtain a transfer paper.

<Transfer Paper of Example 10 and Comparative Example 5>
The coating layer coating liquid was coated on one side of the base paper with a blade coater so that the coating amount was 5 g / m ^2, and dried with a hot air dryer. Subsequently, the outermost coating layer coating liquid was applied onto the coating layer using an air knife coater and dried using a hot air dryer so that the coating amount was 9 g / m ² . Then, a super calendar process was performed to obtain a transfer paper.

<Preparation of transfer paper>
On the obtained transfer paper, an evaluation pattern using the sublimation type printing ink (cyan, magenta, yellow, black) is printed using an inkjet printer (JV2-130II, manufactured by Mimaki Engineering Co., Ltd.) using the sublimation type printing ink. , Transfer paper (roll paper) was obtained.

<Evaluation of strike-through resistance>
In the transfer paper obtained as described above, the strike-through resistance was sensory-evaluated according to the following criteria from the degree of image visibility from the back surface of the transfer paper. In the present invention, it is assumed that the transfer paper has good strike-through resistance when the evaluation is 3 or 4.
4: There is almost no strike-through and it is good.
3: Slight strike-through is observed, but it is generally good.
2: Show-through is observed, but it does not pose a practical problem.
1: A strike-through is recognized, which poses a practical problem.

<Printing (roll paper)>
A rolled polyester cloth was used as the printed matter. The obtained roll paper-like transfer paper and the polyester cloth are brought into close contact with each other, and a heating and pressurizing machine (200 ° C., 0.5 MPa, 2.0 m / min, roller type, contact time with the roller 45 seconds) is used. The dye was transferred to a polyester cloth. Then, the transfer paper was peeled off from the polyester cloth to obtain a polyester cloth on which a pattern was formed.

<Evaluation of image deterioration resistance>
For the polyester cloth on which the pattern was formed, the image quality was sensory-evaluated based on the following criteria for the image deterioration resistance from the viewpoint of the sharpness of the pattern. In the present invention, it is assumed that the transfer paper has good image deterioration resistance when the evaluation is 3 or 4.
4: Good level.
3: Almost no deterioration in image quality is observed, and the level is generally good.
2: Deterioration of image quality is observed, but there is no problem in practical use.
1: A level at which image deterioration that is practically impossible is recognized.

<Evaluation of color development>
In the printed matter, the color density of the solid image part of three colors of sublimation printing ink (cyan, magenta, yellow) was measured using an optical densitometer (X-rite530, manufactured by Sakata Inx Engineering Co., Ltd.), and the color density values of the three colors were measured. Was summed up. The color development was judged according to the following criteria. In the present invention, it is assumed that the transfer paper has good color development when the evaluation is 3 or 4.
4: Total value is 4.8 or more and 3: Total value is 4.5 or more and less than 4.8 2: Total value is 4.2 or more and less than 4.5 1: Total value is less than 4.2

<Evaluation of transferability>
In the printed matter on which the pattern was formed by changing the heating time at the time of close contact, the change in color development in 45 seconds, 60 seconds and 75 seconds was sensory evaluated according to the following criteria. In the present invention, it is assumed that the transfer paper has good transferability when the evaluation is 3 or 4.
4: No change.
3: There is almost no change.
There is a change between 2:45 seconds and 60 seconds,
There is almost no change between 60 seconds and 75 seconds.
Between 1:45 seconds and 60 seconds and between 60 seconds and 75 seconds
Changes are observed.

The evaluation results are shown in Table 1.

From the results in Table 1, it can be seen that Examples 1 to 10 corresponding to the present invention have good image deterioration resistance, color development property, strike-through resistance and transferability. It can be seen that Comparative Examples 1 to 5 which do not correspond to the present invention cannot satisfy all the effects according to the present invention at the same time.
Mainly, from the comparison between Example 1, Example 6 and Example 7, it can be seen that the base paper is preferably acid paper.

Claims (1)

And base paper, on at least one surface of the base paper, and a 1-layer coating layer, the outermost coating layer located outermost will contain at least a pigment and a binder base paper as reference, it is included in the base paper at least one kind calcined kaolin fillers, the base paper JIS P 8133-1: Ri acid paper der pH of the cold water extract is less than pH4.5 or 6 which is measured according to the method based on the 2013, the binder There silanol-modified polyvinyl alcohol and ethylene - Ru Kumiawasedea of vinyl acetate copolymer, a transfer sheet to be used in the transfer printing method using a sublimation printing ink.