JP2017209885A - Transfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer sheet having excellent coating layer surface strength of a transfer paper, capable of forming on a printing target, a pattern free from deterioration of image quality and from decline of color development.SOLUTION: A transfer sheet used for a transfer printing method using a sublimation type dye ink, has a support medium, and a first coating layer and a second coating layer on at least one surface of the support medium, in which the second coating layer positioned on the outermost side based on the support medium is a cast-processed coating layer, and the first coating layer contains a polyamidine compound.SELECTED DRAWING: None

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 substrate such as a fiber material.

  As a method of forming a pattern on a printed material such as a textile material, the pattern is printed on a transfer paper using sublimation dye ink to produce a transfer paper, the transfer paper is adhered to the printed material, and the sublimation dye ink is used. A transfer textile printing method for transferring to a substrate is known (see, for example, Patent Document 1 and Patent Document 2).

Transfer paper used for transfer textile printing is known.
For example, a sheet-like substrate can be used as a sublimation transfer sheet that is excellent in water-based ink absorptivity and capable of obtaining a clear recorded image without bleeding and excellent in ink transfer efficiency to a transfer object during sublimation transfer. Material and an ink receiving layer provided on one side or both sides of the sheet-like base material, and the ink receiving layer contains a pigment, a binder, and a cationic resin. Examples of the binder include starch, starch derivatives, A sublimation transfer sheet is known in which any one of polyvinyl alcohol and modified polyvinyl alcohol or a mixture of two or more thereof is used (see, for example, Patent Document 3).
In addition, it has excellent ink absorption and drying properties in ink jet printing using sublimation textile printing ink, and has good workability, image reproducibility on the surface of transfer paper, heat resistance during heat transfer, after transfer As a sublimation type ink jet printing transfer paper having good properties in terms of image reproducibility and transfer efficiency on the surface of the transferred material, the sublimation type printing ink receiving layer has a sublimation type printing ink receiving layer on a substrate. Contains a water-soluble resin and fine particles, contains the synthetic amorphous silica as the fine particles, and in the relative value of the ultrasonic transmission intensity on the sublimation type printing ink receiving layer side of the sublimation type ink jet printing transfer paper. A sublimation type ink jet printing transfer paper having a minimum value peak within a measurement time of 3 seconds is known (see, for example, Patent Document 4).

  As described in Patent Document 3 and Patent Document 4, an inkjet printing method is used as a method for producing a transfer paper by printing a pattern on a transfer paper using an ink containing a sublimation dye or a sublimation printing ink. Often used.

JP2015-168705A Japanese Patent Laying-Open No. 2015-124324 JP 2010-158875 A JP 2010-058335 A

It is necessary to have two contradictory characteristics between a transfer sheet, which is a white paper before the pattern is printed, and a transfer sheet obtained by printing the pattern on the transfer sheet. That is, the transfer paper is required to have an ability to successfully receive the sublimation dye ink, and the transfer paper is required to have an ability to transfer the sublimation dye ink to the printing material.
The image quality on the transfer paper must be sharp so that the final image quality of the substrate is not degraded. Therefore, it is necessary for the transfer paper to receive the sublimation dye ink without blurring during printing.
On the other hand, when the transfer paper has improved acceptability to the sublimation dye ink, the transfer of the sublimation dye ink may not be successful during transfer to form a pattern on the substrate. As a result, the color developability of the substrate is reduced.

  In addition, when the printed material such as the fiber material and the transfer paper are in close contact with each other, if the surface strength of the transfer paper is insufficient, the surface of the coating layer is partially lost when the transfer paper is in close contact. In particular, there are cases in which color loss occurs in a pattern formed on a printing material, and color development occurs in a portion that is not an original place (fogging).

  An object of the present invention is to provide a transfer paper that has a coating layer surface strength that is good and that can form a pattern on a substrate with no deterioration in image quality and no reduction in color developability. is there.

As a result of intensive studies by the inventor, the object of the present invention is achieved by the following.
[1] A support and a second coating layer that has a first coating layer and a second coating layer on at least one surface of the support and is positioned on the outermost side with respect to the support were cast-treated. A transfer paper used in a transfer printing method using a sublimation dye ink, wherein the transfer layer is a coating layer, and the first coating layer contains a polyamidine compound.

  [2] The transfer paper according to [1], wherein the polyamidine compound has a cation strength of 4.5 meq / g or more and 8.0 meq / g or less.

  According to the present invention, it is possible to provide a transfer paper that has a coating layer surface strength good and that can form a pattern on a printed material with no deterioration in image quality and no deterioration in color developability.

By having the first coating layer and the second coating layer, the sublimation dye ink can be held in the coating layer, and the transfer of the sublimation dye ink is successful during the transfer, and as a result, there is no decrease in color developability. A substrate to be printed on which a pattern is formed can be obtained.
Polyamidine compounds are known as polymer flocculants. Cast treatment is a treatment method in which a coating layer in a wet state is pressure-bonded to a mirror surface, the mirror surface shape is transferred to the surface of the coating layer, moisture is removed from the coating layer and dried to form a coating layer. is there. When the first coating layer contains a polyamidine compound and the second coating layer is cast, the setting property of the second coating layer is increased, and the surface obtained by the casting treatment of the second coating layer is obtained. Extremely uniform and smooth. As a result, the sharpness of the image quality on the transfer paper and the surface strength of the coating layer can be obtained, and finally, a pattern free from image quality deterioration, color loss and fogging can be obtained on the printed material.

The present invention is described in detail below.
In the present invention, the “transfer sheet” refers to a sheet in a blank state before a pattern to be transferred is printed. “Transfer paper” refers to paper on which a pattern to be transferred to the transfer paper is printed.

The transfer paper has a support and a first coating layer and a second coating layer on at least one side of the support. The second coating layer is located on the outermost side with respect to the support.
You may have a 1st coating layer and a 2nd coating layer on the single side | surface or both surfaces of a support body. Alternatively, the support is different from the first coating layer and the second coating layer containing a conventionally known pigment or binder on the side opposite to the side having the first coating layer and the second coating layer. You may have a coating layer.
From the viewpoint of production cost, it is preferable to have the first coating layer and the second coating layer on one side of the support.

  The supports are chemical pulps such as LBKP (Leaf Bleached Kraft Pulp) and NBKP (Needle Bleached Kraft Pulp), GP (Groundwood Pulp), PGW (Pressure Ground Wood pulp), RMP (Refiner Mechanical Pulp), TMP (ThermoMechanical Pulp), At least one kind of pulp selected from mechanical pulp such as CTMP (ChemiThermoMechanical Pulp), CMP (ChemiMechanical Pulp), CGP (ChemiGroundwood Pulp), and waste paper pulp such as DIP (Deinked Pulp), light calcium carbonate, heavy calcium carbonate Various additives such as sizing agent, fixing agent, retention agent, cationizing agent such as cationic resin and polyvalent cation salt, paper strength agent, etc. This is a paper made from a blended paper stock. Further, the support includes high-quality paper obtained by subjecting papermaking paper to calendar treatment, surface sizing treatment or surface treatment with starch, polyvinyl alcohol or the like. Further, the support includes high-quality paper that has been subjected to surface sizing or surface treatment and then calendered. The support includes art paper and coated paper having a conventionally known coating layer.

  In paper stock, other additives include pigment dispersants, thickeners, fluidity improvers, antifoaming agents, antifoaming agents, mold release agents, foaming agents, penetrating agents, colored dyes, colored pigments, fluorescent enhancers. One or more of whitening agents, ultraviolet absorbers, antioxidants, antiseptics, antibacterial agents, water resistance agents, wet paper strength enhancers, dry paper strength enhancers, etc. can be used to achieve the desired effects of the present invention. It can mix | blend suitably in the range which is not impaired.

The basis weight of the support is not particularly limited. From the viewpoint of easy handling with respect to transfer to the printing material, the basis weight of the support is preferably 10 g / m ² or more and 100 g / m ² or less, and more preferably 40 g / m ² or more and 80 g / m ² or less. Further, the thickness of the transfer paper is not particularly limited. From the viewpoint of easy handling with respect to the transfer to the printing material, 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.

Coating layers, such as a 1st coating layer and a 2nd coating layer, can be provided by apply | coating and drying each coating layer coating liquid on a support body or a 1st coating layer.
The coating amount of the coating layer such as the first coating layer or the second coating layer is not particularly limited. Each coating amount is preferably 3 g / m ² or more and 20 g / m ² or less in terms of dry solid content from the viewpoint of the transfer paper production cost and the adhesion to the substrate.

The method for providing the coating layer such as the first coating layer or the second coating layer on the support is not particularly limited. Examples thereof include a method of coating and drying using a conventionally known coating apparatus and drying apparatus in the papermaking field. Examples of the coating apparatus for the first coating layer and the second coating layer include a comma coater, a film press coater, an air knife coater, a rod blade coater, a bar coater, a blade coater, a gravure coater, a curtain coater, and an E bar coater. And so on.
For the first coating layer, examples of drying devices include straight tunnel dryers, arch dryers, air loop dryers, hot air dryers such as sine curve air float dryers, dryers using infrared heating dryers, microwaves, etc. The various drying apparatus can be mentioned. The drying of the second coating layer is finally performed by a casting process.

The first coating layer contains a polyamidine compound. The content of the polyamidine compounds, from the viewpoint of the coating layer surface strength of the transfer paper, 0.1 g / ^{m 2} or more 3.5 g / ^{m 2} or less.
The polyamidine compound of the present invention is a copolymer of N-vinylacrylamidine hydrochloride and at least one monomer selected from acrylamide, acrylonitrile, N-vinylacrylamide and vinylamine. The content ratio of N-vinylacrylamidine hydrochloride in the copolymer is preferably 60 mol% or more and 90 mol% or less.

  The polyamidine compound preferably has a cation strength of 4.5 meq / g or more and 8.0 meq / g or less. When the cation strength of the polyamidine compound is within the above range, the image quality and color developability of the printing material and the coating layer surface strength of the transfer paper are improved.

  The cation intensity is a flowing current method using colloid titration, and measures the charge possessed by both the colloidal particles and the polymer electrolyte. As an example of the measuring device, Charge Analyzer II manufactured by RANK BROTHERS in the UK can be mentioned.

  The first coating layer preferably contains a pigment and a binder in addition to the polyamidine compound.

  The pigment is a conventionally known pigment, such as gas phase method silica, precipitation method silica, gel method silica, sol method silica, alumina sol, alumina, light calcium carbonate, heavy calcium carbonate, satin white, clay, talc, Examples thereof include titanium oxide, kaolin, calcined kaolin, zinc oxide, activated clay, diatomaceous earth, lake, and plastic pigment.

  The binder is a conventionally known binder such as polyvinyl alcohol and modified derivatives thereof, styrene-butadiene copolymer, starch and modified derivatives thereof, cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose, casein, gelatin, soybean protein, Natural polymer resins such as pullulan, gum arabic, karaya gum, albumin or derivatives thereof, polyvinylpyrrolidone, polyacrylamide, polyethyleneimine, polypropylene glycol, polyethylene glycol, maleic anhydride resin, acrylic resin, methacrylate ester-butadiene copolymer , Ethylene-vinyl acetate copolymers, or functional group-modified copolymers with functional group-containing monomers such as carboxy groups of these various copolymers, melamine resins, urea resins, etc. Binder such as hardening synthetic resin, polyurethane resin, unsaturated polyester resin, polyvinyl butyral, can be exemplified alkyd resin latex.

  The first coating layer can contain various conventionally known additives in the coated paper field as necessary. Examples of additives include dispersants, fixing agents, thickeners, fluidity improvers, antifoaming agents, mold release agents, foaming agents, penetrating agents, coloring pigments, colored dyes, fluorescent whitening agents, UV absorbers , Antioxidants, preservatives, antifungal agents and the like.

The second coating layer is a cast-treated coating layer.
Casting is a process in which a wet coating layer is pressure-bonded to a heated mirror surface, the mirror shape is transferred to the surface of the coating layer, and moisture is removed from the coating layer by drying to form a coating layer. Is the method. An apparatus for casting (casting apparatus) usually has a structure in which a coating layer in a wet state is pressure-bonded to the surface of a cylinder whose surface is chrome-plated. The casting process includes a direct method, a rewet method, a pseudo rewet method, and a coagulation method. Any of these methods may be used for the casting process.

  The second coating layer preferably contains a pigment and a binder.

  Examples of the pigment and binder of the second coating layer include the pigment and binder of the first coating layer. The second coating layer and the first coating layer may be the same or different in pigment and binder.

The 2nd coating layer can contain conventionally well-known various additives in the field of coated paper as needed. Examples of additives include dispersants, fixing agents, thickeners, fluidity improvers, antifoaming agents, mold release agents, foaming agents, penetrating agents, coloring pigments, colored dyes, fluorescent whitening agents, UV absorbers , Antioxidants, preservatives, antifungal agents and the like.
Further, the second coating layer can contain various conventionally known auxiliaries by a transfer printing method. The auxiliary agent is added to optimize various physical properties of the second coating layer coating solution or to improve the dyeing property of the transferred sublimation dye ink. Examples of the auxiliary agent include various surfactants, humectants, wetting agents, pH adjusting agents, alkali agents, thickening agents, deaerating agents and reduction inhibitors.

The transfer paper can be obtained by printing a pattern on the side of the transfer paper having the first coating layer and the second coating layer using various conventionally known printing methods including sublimation dye ink. .
Various printing methods for printing the design on the transfer paper are conventionally known printing methods and are not particularly limited. Examples of the printing method include a gravure printing method, an ink jet printing method, an electrophotographic printing method, a screen printing method, and the like. Among these, the ink jet printing method is preferable in terms of high image quality and downsizing of the apparatus.

  The transfer textile printing method is a method having a step of printing a pattern on a transfer paper to obtain a transfer paper and a step of bringing the transfer paper into close contact with a substrate. The process of making it adhere | attach includes heating and pressurization as needed. The conditions for heating and pressurizing in the step of adhering are conventionally known conditions in the transfer printing method. Examples of the step of bringing in close contact include a method in which the transfer paper is brought into close contact with the substrate to be printed with a press or a heating drum and heated and pressurized.

  In the transfer textile printing method, the dye transferred to the substrate can be fixed as necessary. Steaming can be given as an example of the fixing process. As the steaming conditions, conventionally known conditions can be applied in the transfer printing method. For example, the condition of steaming with steam at 100 to 220 ° C. for 5 to 30 minutes can be applied.

  The printed material after the fixing treatment can be subjected to a conventionally known washing treatment by a transfer printing method such as washing with water or soaping.

  The substrate is not particularly limited. When a sublimable dye is used, a hydrophobic fiber material is used. Examples of hydrophobic fiber materials include polyamide fibers (nylon), vinylon, polyester, polyacrylic and other synthetic fiber materials, and natural fiber materials such as cotton, hemp, lyocell, rayon, etc. treated with polyester. Materials etc. can be mentioned. Examples of the configuration of the fiber material include woven fabrics, knitted fabrics, nonwoven fabrics, and the like alone, mixed spinning, mixed fiber, and union. Furthermore, these configurations may be combined. Moreover, you may pre-process a to-be-printed material with the chemical | medical agent effective in dyeing | staining promotion as needed.

  Hereinafter, the present invention will be described in more detail with reference to 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 dry solid content.

Example 1
<Preparation of first coating layer coating solution>
Using water as a medium, a first coating layer coating solution and a second coating layer coating solution were prepared with the following composition. Finally, the concentration of each coating layer coating solution was 15% by mass.

Precipitated silica 100 parts by weight Polyvinyl alcohol 100 parts by weight Polyamidine compound (cationic strength 3.0 meq / g) 25 parts by weight

<Preparation of second coating layer coating solution>
Sol method silica 100 parts by weight Polyvinyl alcohol 100 parts by weight

<Production of transfer paper>
The first coating layer coating liquid was applied to one surface of a high-quality paper having a basis weight of 77 g / m ² using a curtain coater and dried using a hot air dryer. At this time, the coating amount of the first coating layer was 10 g / m ² . Further, on the first coating layer, the second coating layer coating solution was applied using an air knife coater, and pressed and dried on a mirror drum heated to 120 ° C. while in a wet state. 1 transfer paper was obtained. At this time, the coating amount of the second coating layer was 3 g / m ² .

(Examples 2 to 5)
In Example 1, except that the polyamidine compound of Example 1 was changed to a polyamidine compound having a different cation strength, the same procedures as in Example 1 were carried out to obtain transfer sheets of Examples 2 to 5.
The cation strength was 4.5 meq / g in Example 2, 5.5 meq / g in Example 3, 8.0 meq / g in Example 4, and 10 meq / g in Example 5.

(Comparative Example 1)
In Example 3, a transfer sheet of Comparative Example 1 was obtained in the same manner as in Example 3 except that the first coating layer did not contain a polyamidine compound.

(Comparative Example 2)
A transfer paper of Comparative Example 2 was obtained in the same manner as in Example 3 except that the polyamidine compound was changed to diallyldimethylammonium chloride in Example 3.

(Comparative Example 3)
In Example 3, the transfer layer of Comparative Example 3 was obtained in the same manner as in Example 3 except that the second coating layer was not cast and dried.

(Comparative Example 4)
In Comparative Example 3, a transfer sheet of Comparative Example 4 was obtained in the same manner as Comparative Example 3 except that the second coating layer was dried and then subjected to supercalendering.

<Preparation of transfer paper>
For each transfer paper obtained as described above, an ink jet printer (JV2-130II, manufactured by Mimaki Engineering Co., Ltd.) using a sublimation dye ink is used for evaluation with sublimation dye ink (cyan, magenta, yellow, black). Was printed to obtain a transfer paper.

<Evaluation of coating layer surface strength of transfer paper>
A black cloth was placed on the surface on which the design for evaluation of each transfer paper was printed, and a 19.6 N weight on which a 1 cm square and 1.5 mm thick plastic plate was attached was placed thereon. Next, the edge of the black cloth was held by hand and gently pulled horizontally. At this time, the state of the coating layer component adhering to the black cloth from the transfer paper was subjected to sensory evaluation according to the following criteria. In the present invention, if the evaluation is A or B, the coating layer surface strength is assumed to be good.
A: Almost no adhesion is observed on the black cloth, which is good.
B: Slight adhesion is observed on the black cloth, but it is generally good.
C: Some adhesion to the black cloth is observed, but there is no practical problem.
D: Adherence to black cloth was observed, and there was a problem in practical use.

<Printing>
A polyester cloth was used as the substrate. The obtained transfer paper and the polyester cloth are brought into close contact with each other, heated at 200 ° C. for 1 minute using a thermal transfer press (manual wide swinger Model 221 manufactured by INSTA), and the dye is transferred to the polyester cloth. It peeled from the polyester cloth and the polyester cloth in which the pattern was formed was obtained.

<Evaluation of image quality>
From the viewpoint of the sharpness of the design, the image quality of the polyester cloth on which the design was formed was sensoryly evaluated according to the following criteria. In the present invention, if the evaluation is A or B, the image quality is not deteriorated.
A: Good level.
B: Almost no deterioration in image quality is observed, and the level is generally good.
C: Deterioration in image quality is recognized, but there is no practical problem.
D: Unusable level.

<Evaluation of color development>
On the printed material, the color density of the solid image portion of three colors of sublimation dye ink (cyan, magenta, yellow) was measured using an optical densitometer (X-rite 530, manufactured by Sakata Inx Engineering Co., Ltd.). Totaled. Judgment was made according to the following criteria. In the present invention, if the evaluation is A or B, it is assumed that there is no decrease in color developability.
A: Total value is 4.7 or more B: Total value is 4.4 or more and less than 4.7 C: Total value is less than 4.4

  The evaluation results are shown in Table 1.

From the evaluation results in Table 1, in Examples 1 to 5 corresponding to the present invention, the coating layer surface strength of the transfer paper is good, and a pattern having no deterioration in image quality and no deterioration in color developability is formed on the substrate. You can see that it is possible. It turns out that Comparative Examples 1-4 which does not satisfy the structure of this invention cannot obtain all these effects.
From the comparison between Example 1 and Example 5 and Examples 2 to 4, it can be seen that the cation strength of the polyamidine compound is preferably 4.5 meq / g or more and 8.0 meq / g or less.

Claims (2)

  A support layer, and a coating layer having a first coating layer and a second coating layer on at least one surface of the support body, and the second coating layer located on the outermost side with respect to the support body being cast-treated. A transfer paper used in a transfer printing method using a sublimation dye ink, wherein the first coating layer contains a polyamidine compound.   The transfer paper according to claim 1, wherein the polyamidine compound has a cation strength of 4.5 meq / g or more and 8.0 meq / g or less.