JP2022141375A - Thermal transfer image-receiving sheet - Google Patents

Abstract

To provide a thermal transfer image-receiving sheet which has a deodorization function and suppresses deterioration in conveyance in a printer.SOLUTION: A thermal transfer image-receiving sheet has a base material, a receiving layer provided on one surface of the base material, and a diatomaceous earth layer provided on the other surface of the base material. The diatomaceous earth layer contains a diatomaceous earth and a polymer. A ratio of a mass of the diatomaceous earth to a mass of the entire diatomaceous earth layer is 25% or more and 50% or less. The diatomaceous earth layer may contain a coloring agent. The polymer can employ an aqueous resin.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to thermal transfer image receiving sheets.

Conventionally, various thermal transfer methods have been proposed. For example, a sublimation thermal transfer method is known, which is excellent in transparency, has high intermediate color reproducibility and gradation, and can easily form high-quality images equivalent to conventional full-color photographic images.

In forming a thermal transfer image by a sublimation thermal transfer method, a thermal transfer sheet having a dye layer provided on one side of a base material and a receiving layer provided on one side of a material to be transferred, such as another base material, are used. A thermal transfer image receiving sheet is used. Then, the receiving layer of the thermal transfer image-receiving sheet and the dye layer of the thermal transfer sheet are overlaid, and heat is applied from the back side of the thermal transfer sheet with a thermal head to transfer the dye from the dye layer onto the receiving layer. A printed matter is obtained in which a thermally transferred image is formed on the layer.

As a thermal transfer image-receiving sheet, there has been proposed a sheet containing a pearlescent pigment in one of the layers so as to obtain a high-value-added print having a pearly design.

In recent years, prints such as posters and calendars are required to have added value other than designability, and in particular, there is a demand for thermal transfer image-receiving sheets capable of producing prints having a deodorizing function. Diatomaceous earth is known as a material having a deodorizing function, and Patent Document 1 discloses an image-receiving sheet mixed with diatomaceous earth.

However, conventional image-receiving sheets mixed with diatomaceous earth have a reduced gripping force with rollers of printers, deteriorating transportability, and there is a risk of misalignment of printed images.

JP 2006-111994 A

An object of the present disclosure is to provide a thermal transfer image-receiving sheet that has a deodorizing function and suppresses the deterioration of the transportability in the printer.

A thermal transfer image-receiving sheet of the present disclosure comprises a substrate, a receiving layer provided on one surface of the substrate, and a diatomite layer provided on the other surface of the substrate, wherein the diatomite layer is It includes diatomaceous earth and macromolecular polymers.

According to the present disclosure, the thermal transfer image-receiving sheet has a deodorizing function and can suppress deterioration of the transportability in the printer.

1 is a schematic cross-sectional view showing an example of a thermal transfer image-receiving sheet according to an embodiment of the present disclosure; FIG.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings and the like. It should be noted that the present disclosure can be embodied in many different modes and should not be construed as being limited to the description of the embodiments exemplified below. In addition, in order to clarify the description, the drawings may schematically show the width, thickness, etc. of each part compared to the actual embodiment, but this is only an example and limits the interpretation of the present disclosure. not a thing

<<Thermal Transfer Image Receiving Sheet>>
As shown in FIG. 1, the thermal transfer image receiving sheet 10 according to the embodiment of the present disclosure includes a base material 1, a receiving layer 3 provided on one side of the base material 1, and the other side of the base material 1. and a diatomaceous earth layer 4 provided on the side. A primer layer 2 may be provided between the substrate 1 and the receiving layer 3 .

The diatomaceous earth layer 4 contains diatomaceous earth and macromolecular polymers. By containing diatomaceous earth, the thermal transfer image-receiving sheet 10 has a deodorizing effect.

Each configuration of the thermal transfer image receiving sheet 10 will be specifically described below.

(Base material)
As the substrate 1, for example, stretched or unstretched substrates of plastics such as polyesters such as polyethylene terephthalate and polyethylene naphthalate, polypropylene, polycarbonate, cellulose acetate resins, polyethylene derivatives, polyamides and polymethylpentene (films may be used). ), high-quality paper, coated paper, resin-coated paper, art paper, cast-coated paper, paperboard, emulsion-impregnated paper, synthetic rubber latex-impregnated paper, synthetic resin-incorporated paper, cellulose fiber paper, and the like.

Although the thickness of the substrate 1 is not particularly limited, it is preferably 50 μm or more and 300 μm or less.

(receptive layer)
There are no particular restrictions on the components of the receiving layer 3 . For example, polyolefin resin such as polypropylene, halogenated resin such as polyvinyl chloride or polyvinylidene chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer or vinyl resin such as polyacrylate. , polyesters such as polyethylene terephthalate or polybutylene terephthalate, copolymers of polyolefins such as ethylene or propylene with other vinyl polymers, cellulose resins such as ionomers or cellulose diacetate, solvent-based solvents such as polycarbonate, polystyrene, polyamide, acrylic resins, etc. can be mentioned. These materials may be used singly or in combination of two or more.

Although the thickness of the receiving layer 3 is not particularly limited, it is preferably 0.5 μm or more and 10 μm or less, more preferably 2 μm or more and 5 μm or less.

Sublimation transfer of a dye to the receiving layer 3 is a suitable image forming method because it can form an image with excellent transparency, but the image forming method is not limited to this, and melt transfer using a pigment as a coloring material, inkjet printing, etc. , gravure printing, or the like.

(primer layer)
The primer layer 2 is provided between the base material 1 and the receiving layer 3 and can improve adhesion between the layers. The primer layer contains a resin material such as polyester, polyurethane, polycarbonate, (meth)acrylic resin, styrene resin, vinyl resin and cellulose resin.

The thickness of the primer layer 2 is not particularly limited, and is, for example, 0.1 μm or more and 3 μm or less.

(Diatomaceous earth layer)
The diatomaceous earth layer 4 contains macromolecular polymer and diatomaceous earth. Polyolefin resins such as polyvinyl alcohol and polypropylene; halogenated resins such as polyvinyl chloride and polyvinylidene chloride; vinyl resins such as polyvinyl acetate and polyacrylic ester; urethane resins; Resin etc. are mentioned. The polymer contained in the diatomaceous earth layer 4 is preferably water-based resin. The term "aqueous resin" means a water-soluble resin or a resin that is insoluble in an aqueous solvent but dispersible in an aqueous solvent such as an emulsion or a dispersion. The water-based solvent includes water, a mixed solvent of water and alcohol, and the like.

The content of diatomaceous earth in the diatomaceous earth layer 4 is preferably 25% by mass or more and 50% by mass or less. By setting the content of diatomaceous earth within this numerical range, the adhesiveness of the diatomaceous earth layer 4 to the base material 1 can be ensured, and the thermal transfer image-receiving sheet 10 can have a sufficient deodorizing effect. In addition, when the thermal transfer image receiving sheet 10 is conveyed in the printer, it is possible to ensure that the pin of the capstan roller sticks and obtain a suitable gripping force.

The diatomaceous earth layer 4 may further contain a coloring agent to obtain a desired shade. Examples of coloring agents include white titanium oxide, carbon black, iron oxide, manganese dioxide, and aniline black.

The thickness of the diatomaceous earth layer 4 is not particularly limited, and is, for example, 1 μm or more and 50 μm or less.

EXAMPLES Next, the present disclosure will be described more specifically with reference to Examples, but the present disclosure is not limited to these Examples. In addition, "parts" in the text are based on mass unless otherwise specified.

(Example 1)
Coated paper having a thickness of 125 μm was used as a substrate, and a primer layer coating liquid having the following composition was applied to one surface of this substrate and dried to form a primer layer having a thickness of 1 μm. On this primer layer, a receiving layer coating solution having the following composition was applied and dried to form a receiving layer having a thickness of 4 μm. A diatomaceous earth layer coating liquid 1 having the following composition is applied to the other surface of the base material and dried to form a diatomaceous earth layer having a thickness of 50 μm. Thus, a thermal transfer image-receiving sheet of Example 1 was obtained.

<Coating solution for primer layer>
・ Polyurethane (N-5199 Nippon Polyurethane Industry Co., Ltd.) 5.04 parts ・ White pigment (anatase type titanium oxide) 10.08 parts (TCA-888 Sakai Chemical Industry Co., Ltd.)
Curing agent (Takenate (registered trademark) A-14 Mitsui Chemicals, Inc.) 2.04 parts Methyl ethyl ketone 8 parts Toluene 8 parts Isopropyl alcohol 4 parts

<Coating solution for receiving layer>
・Vinyl chloride-vinyl acetate copolymer 12 parts (#1000A Denka Co., Ltd.)
・Epoxy-modified silicone 0.8 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
・ Amino-modified silicone 0.24 parts (X-22-1660B-3 Shin-Etsu Chemical Co., Ltd.)
・30 parts of toluene ・30 parts of methyl ethyl ketone

<Coating solution 1 for diatomaceous earth layer>
・Polyester 75 parts (Vylonal (registered trademark) MD1480 Toyobo Co., Ltd.)
・ Diatomaceous earth (Radiolite 800 Hayashi Kasei Co., Ltd.) 25 parts ・ Water 225 parts

(Example 2)
In place of the diatomaceous earth layer coating liquid 1, the diatomaceous earth layer coating liquid 2 having the following composition was applied to the other surface of the substrate and dried to form a diatomaceous earth layer having a thickness of 50 μm. A thermal transfer image-receiving sheet of Example 2 was obtained in the same manner as above.

<Coating liquid 2 for diatomaceous earth layer>
・ Polyester 50 parts (Vylonal (registered trademark) MD1480 Toyobo Co., Ltd.)
・Diatomaceous earth (Radiolite 800 Hayashi Kasei Co., Ltd.) 50 parts ・Water 150 parts

(Example 3)
In place of the diatomaceous earth layer coating liquid 1, the diatomaceous earth layer coating liquid 3 having the following composition was applied to the other side of the substrate and dried to form a diatomaceous earth layer having a thickness of 50 μm. A thermal transfer image-receiving sheet of Example 3 was obtained in the same manner as above.

<Diatomaceous earth layer coating liquid 3>
・ Polyester 60 parts (Vylonal (registered trademark) MD1480 Toyobo Co., Ltd.)
・Diatomaceous earth (Radiolite 800 Hayashi Kasei Co., Ltd.) 40 parts ・Water 180 parts

(Example 4)
A thermal transfer image-receiving sheet of Example 4 was obtained in the same manner as in Example 1, except that a PET film (S100 #100, Mitsubishi Chemical Co., Ltd.) having a thickness of 100 μm was used as the substrate instead of the coated paper.

(Example 5)
In place of the diatomaceous earth layer coating liquid 1, the diatomaceous earth layer coating liquid 4 having the following composition was applied to the other side of the substrate and dried to form a diatomaceous earth layer having a thickness of 50 μm. A thermal transfer image-receiving sheet of Example 5 was obtained in the same manner as above.

<Diatomaceous earth layer coating solution 4>
・ Polyester 80 parts (Vylonal (registered trademark) MD1480 Toyobo Co., Ltd.)
・ Diatomaceous earth (Radiolite 800 Hayashi Kasei Co., Ltd.) 20 parts ・ Water 240 parts

(Example 6)
In place of the diatomaceous earth layer coating liquid 1, the diatomaceous earth layer coating liquid 5 having the following composition was applied to the other side of the substrate and dried to form a diatomaceous earth layer having a thickness of 50 μm. A thermal transfer image-receiving sheet of Example 6 was obtained in the same manner as above.

<Diatomaceous earth layer coating liquid 5>
・ Polyester 45 parts (Vylonal (registered trademark) MD1480 Toyobo Co., Ltd.)
・Diatomaceous earth (Radiolite 800 Hayashi Kasei Co., Ltd.) 55 parts ・Water 22.5 parts

(Comparative example 1)
Instead of the diatomaceous earth layer coating solution 1, a back layer coating solution having the following composition was applied to the other surface of the substrate and dried to form a back layer having a thickness of 10 μm. Similarly, a thermal transfer image-receiving sheet of Comparative Example 1 was obtained.

<Coating solution for back layer>
・ Polyester 100 parts (Vylonal (registered trademark) MD1480 Toyobo Co., Ltd.)
・ 300 parts of water

(Comparative example 2)
In place of the diatomaceous earth layer coating liquid 1, the diatomaceous earth layer coating liquid 6 having the following composition was applied to the other surface of the substrate and dried to form a diatomaceous earth layer having a thickness of 50 μm. A thermal transfer image-receiving sheet of Comparative Example 2 was obtained in the same manner as above.

<Diatomaceous earth layer coating solution 6>
・Diatomaceous earth (Radiolite 800 Hayashi Kasei Co., Ltd.) 100 parts ・Water 50 parts

<<Adhesion Evaluation>>
Adhesive tape (Cellotape (registered trademark) CT405AP-12, Nichiban Co., Ltd.) having a size of 1.2 cm × 5 cm was attached to the diatomaceous earth layer surface of the thermal transfer image-receiving sheet of each example and comparative example. The tape was vigorously peeled off with the layers forming a 90° angle. The peeled surface was visually observed, and the adhesiveness of the diatomaceous earth layer was evaluated based on the following evaluation criteria. Table 1 shows the results.

"Evaluation criteria"
A: No peeling B: Slight peeling C: Large peeling

<<Conveyance Evaluation>>
Using a printer (DS620 Dai Nippon Printing Co., Ltd.), image formation (R, G, B = 127/255, 127/255, 127/255) was performed on the receiving layer of the thermal transfer image receiving sheet of each example and comparative example. A print was produced. The image formed on the printed matter was observed using a laser microscope (manufactured by Keyence Corporation) to confirm whether or not misregistration occurred, and transportability was evaluated based on the following evaluation criteria. Table 1 shows the results. It should be noted that misregistration is printing position misalignment due to insufficient transportability, and the image-receiving sheet after printing on the Y panel or M panel is not transported to the correct position, and the image is misaligned, resulting in degraded print quality. means Further, no occurrence of misregistration means good transportability.

"Evaluation criteria"
A: No misregistration occurred B: A very slight misregistration of about 0.3 mm occurred C: A slight misregistration of about 0.5 mm occurred, but there was no problem with the printed matter Level D: About 1 mm There was a misregistration of

<<Deodorant Evaluation>>
Printed matter using the thermal transfer image-receiving sheets of each of the examples and comparative examples produced in the transportability evaluation was cut into a size of 50 cm ³ . A cut piece of the printed matter and 0.1 g of ammonia were placed in a closed container of 100 cm ³ , left for 12 hours, the lid was opened, and the odor inside the container was confirmed. . Table 1 shows the results.

"Evaluation criteria"
A: No odor B: Slight odor remained C: Strong odor remained

<<Appearance Evaluation>>
Printed matter prepared using the thermal transfer image-receiving sheets of Examples and Comparative Examples prepared for transportability evaluation was visually confirmed from the receiving layer side, and appearance evaluation was performed based on the following evaluation criteria. Table 1 shows the results.

"Evaluation criteria"
A: Has a very good texture of diatomaceous earth B: Has a good texture of diatomaceous earth C: Has a texture of diatomaceous earth D: Does not have a texture of diatomaceous earth

REFERENCE SIGNS LIST 1 substrate 2 primer layer 3 receiving layer 4 diatomaceous earth layer

Claims (4)

a substrate;
a receiving layer provided on one surface of the substrate;
A diatomaceous earth layer provided on the other surface of the base material;
with
The thermal transfer image-receiving sheet, wherein the diatomaceous earth layer contains diatomaceous earth and a polymer. 2. The thermal transfer image-receiving sheet according to claim 1, wherein the ratio of the mass of said diatomaceous earth to the mass of said whole diatomaceous earth layer is 25% or more and 50% or less. 3. The thermal transfer image-receiving sheet according to claim 1, wherein said diatomaceous earth layer contains a coloring agent. 4. The thermal transfer image-receiving sheet according to claim 1, wherein said polymer is a water-based resin.

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