JP2021133587A - Support for image receiving paper and image receiving paper - Google Patents

Abstract

To provide a support for image receiving paper which can significantly improve image density and printing unevenness prevention without providing a porous film, enables production of thermal transfer image receiving paper excellent in manufacturing cost, and has high blocking resistance.SOLUTION: A support for image receiving paper includes a base material, a first resin layer and a second resin layer. Thermal conductivity of a resin composition constituting the first resin layer is higher than thermal conductivity of a resin composition constituting the second resin layer, a bending elastic modulus of the resin composition constituting the first resin layer is lower than a bending elastic modulus of the resin composition constituting the second resin layer, and an acceptance layer is provided on the second resin layer side.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a support for image receiving paper and an image receiving paper.

Various printing methods are known, but among them, the sublimation thermal transfer method can freely adjust the density gradation, has excellent reproducibility of neutral colors and gradations, and forms a high-quality image comparable to silver halide photography. Is possible.

In the sublimation type thermal transfer method, a thermal transfer sheet having a color material layer containing a sublimation dye and a thermal transfer image paper provided with a receiving layer are superposed, and then the thermal transfer sheet is heated by a thermal head provided in the thermal transfer printer. This is a method in which the sublimation dye in the color material layer is transferred to the receiving layer to form an image and obtain a printed matter.

In thermal transfer image paper, a porous film may be laminated under the receiving layer for the purpose of improving the density of the image formed on the photographic paper and suppressing the occurrence of uneven printing.

However, the thermal transfer image receiving paper provided with the porous film requires a high cost to manufacture.

Further, since the thermal transfer image receiving paper is wound up and stored in the state of the image receiving paper support before the receiving layer is formed, it is required to have high blocking resistance.

An object of the present disclosure is to provide a support for image-receiving paper, which can produce a heat-transfer image-receiving paper capable of remarkably improving image density and photographic unevenness suppression without providing a porous film, and has high blocking resistance. Is. Another object of the present disclosure is to provide a receiving paper provided with the receiving paper support.

The image receiving paper support of the present disclosure includes a base material, a first resin layer, and a second resin layer.
The thermal conductivity of the resin composition constituting the first resin layer is higher than the thermal conductivity of the resin composition constituting the second resin layer.
The flexural modulus of the resin composition constituting the first resin layer is lower than the flexural modulus of the resin composition constituting the second resin layer.
This is a support for image receiving paper for providing a receiving layer on the second resin layer side.

The image receiving paper of the present disclosure includes the above-mentioned image receiving paper support and a receiving layer provided on the second resin layer.

According to the present disclosure, it is possible to provide a thermal transfer image-receiving paper capable of remarkably improving image density and photographic unevenness suppression without providing a porous film, and to provide a support for image-receiving paper having high blocking resistance. Further, according to the present disclosure, it is possible to provide an image receiving paper provided with the image receiving paper support.

It is a schematic cross-sectional view of the support for image receiving paper in one Embodiment. It is a schematic cross-sectional view of the support for image receiving paper in one Embodiment. It is a schematic cross-sectional view of the image receiving paper in one embodiment.

(Support for image receiving paper)
As shown in FIG. 1, the image receiving paper support 10 of the present disclosure includes a base material 11, a first resin layer 12, and a second resin layer 13.
In one embodiment, as shown in FIG. 2, the image receiving paper support 10 includes a back surface resin layer 14 on a surface opposite to the surface of the base material 11 on which the first resin layer 12 is provided.
In one embodiment, the image receiving paper support 10 includes another resin layer between the first resin layer 12 and the second resin layer 13 (not shown). A plurality of the other resin layers may be provided.
Further, in one embodiment, the image receiving paper support 10 is provided with a back surface layer under the back surface resin layer 14 (not shown).

In the support for image receiving paper of the present disclosure, the thermal conductivity of the resin composition constituting the first resin layer is higher than the thermal conductivity of the resin composition constituting the second resin layer, and the first resin layer The bending elasticity of the resin composition constituting the second resin layer is lower than the bending elasticity of the resin composition constituting the second resin layer. As a result, the printing density, the printing unevenness suppressing property, and the blocking resistance can be remarkably improved.
In the present disclosure, the thermal conductivity of the resin composition is measured in accordance with ASTM C 177-04.
The thermal conductivity of the image receiving paper support and the image receiving paper is measured in accordance with JIS R 2616 (Transient Hot Wire Method).
The flexural modulus is measured in accordance with JIS K 7171 (issued in 2016).

The thermal conductivity of the resin composition constituting the first resin layer is preferably 0.03 W / m · K or more higher than the thermal conductivity of the resin composition constituting the second resin layer, preferably 0.05 W / K. It is more preferable that it is higher than m · K. Thereby, the printing density, the printing unevenness suppressing property, and the blocking resistance can be further improved. In addition, excess heat can be diffused while securing the heat required for dye transfer on the surface of the receiving layer. As a result, it is possible to further improve the image density of the printed matter while suppressing the occurrence of the printed wrinkles and kogation.
The flexural modulus of the resin composition constituting the first resin layer is preferably 200 MPa or more and 1500 MPa or less lower than the flexural modulus of the resin composition constituting the second resin layer, and is 300 MPa or more and 1450 MPa or less lower. Is more preferable. By setting it to 200 MPa or more, the blocking property is improved. By setting the value to 1450 MPa or less, the occurrence of uneven printing can be suppressed.

Hereinafter, each layer provided in the image receiving paper support according to the present disclosure will be described.

(Base material)
The base material may be a paper base material or a film made of a resin material (hereinafter, simply referred to as “resin film”).
Examples of the paper base material include condenser paper, glassin paper, sulfate paper, synthetic paper, high-quality paper, art paper, coated paper, non-coated paper, cast-coated paper, wallpaper, cellulose fiber paper, synthetic resin inner paper, and backing paper. And impregnated paper (synthetic resin impregnated paper, emulsion impregnated paper, synthetic rubber latex impregnated paper) and the like.
Examples of the resin material constituting the resin film include polyolefins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyethylene (PE), polypropylene (PP) and polymethylpentene, and poly. Examples include vinyl resins such as vinyl chloride, polyvinyl chloride and vinyl chloride-vinyl acetate copolymers, (meth) acrylic resins such as polyacrylate and polymethacrylate, styrene resins such as polystyrene (PS), polycarbonates, and ionomer resins. Be done.
When the base material is a resin film, the resin film may be a stretched film or an unstretched film, but from the viewpoint of mechanical strength, the stretched film is stretched in the uniaxial direction or the biaxial direction. It is preferable to use a film.
In the present disclosure, "(meth) acrylic" includes both "acrylic" and "methacryl". Further, "(meth) acrylate" includes both "acrylate" and "methacrylate".

Further, a support for image-receiving paper made of two or more paper base materials, a support for image-receiving paper made of two or more resin films, or a laminate of a paper base material and a resin film can be used as a base material.
These image receiving paper supports can be manufactured by a dry lamination method, a wet lamination method, an extraction method, or the like.

The thickness of the base material is preferably 80 μm or more and 200 μm or less, and more preferably 95 μm or more and 150 μm or less. As a result, the occurrence of curl can be effectively suppressed (hereinafter referred to as curl inhibitory property).

(First resin layer)
The resin composition constituting the first resin layer contains at least one resin material. Examples of the resin material include polyesters such as PET, PBT, PEN and 1,4-polycyclohexylene methylene terephthalate, polyamides such as nylon 6 and nylons 6 and 6, PP (homo PP, random PP, block PP), and the like. High-density polyethylene (HDPE, density 0.942 g / cm ³ or more), medium-density polyethylene (MDPE, density 0.930 g / cm ³ or more and less than 0.942 g / cm ³ ), low-density polyethylene (LDPE, density 0.910 g / cm / Cm ³ or more and less than 0.930 g / cm ³ ) and polyolefins such as polymethylpentene, polyvinyl chloride, polyvinyl alcohol (PVA), polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral and polyvinylpyrrolidone (PVP) Vinyl resin such as, polyacrylate and (meth) acrylic resin such as polymethacrylate, imide resin such as polyimide and polyetherimide, cellophane, cellulose acetate, nitrocellulose, cellulose acetate propionate (CAP) and cellulose acetate butyrate. Examples thereof include cellulose resins such as (CAB), styrene resins such as polystyrene (PS), polycarbonates, ionomer resins, and copolymers of monomers constituting the resin materials. Examples of the copolymer include a copolymer of an α-olefin and another monomer (hereinafter referred to as α-olefin copolymer), an ethylene- (meth) acrylic acid copolymer, and the like.
Among these, polyolefins and α-olefin copolymers are preferable. Thereby, the printing density, the printing unevenness suppressing property, and the blocking resistance can be further improved.
The resin composition constituting the first resin layer may contain two or more kinds of resin materials.

The resin composition constituting the first resin layer is a mold release material, a plastic material, a filler, an ultraviolet stabilizer, a coloring inhibitor, a surface active material, a fluorescent whitening material, a matte material, a deodorant material, and a flame retardant material. , Weatherproof material, antistatic material, thread friction reducing material, slip material, antioxidant material, ion exchange material, dispersant material, ultraviolet absorber, and additive material such as coloring material such as pigment and dye can be included.

The thermal conductivity of the resin composition constituting the first resin layer is not particularly limited as long as it is higher than the thermal conductivity of the resin composition constituting the second resin layer, but the above-mentioned thermal conductivity difference In consideration of the preferable numerical range of the thermal conductivity of the second resin composition described below, 0.19 W / m · K or more is preferable, and 0.21 W / m · K or more is more preferable. As a result, the image density can be further improved without printing wrinkles and kogation of the printed matter, and the printing unevenness suppression property and blocking resistance can be further improved.

The flexural modulus of the resin composition constituting the first resin layer is preferably 300 MPa or less, more preferably 100 MPa or less. Thereby, the printing unevenness suppression property and the blocking resistance can be further improved.
The flexural modulus is preferably 2 MPa or more, and more preferably 40 MPa or more. Thereby, the printing unevenness suppression property and the blocking resistance can be further improved.

The density of the resin composition constituting the first resin layer ^{is preferably 0.83 g / cm 3} or more and 0.97 g / cm ³ or less, and more preferably 0.86 g / cm ³ or more and 0.94 g / cm ³ or less. Thereby, the curl suppressing property can be further improved.

The thickness of the first resin layer is preferably 1 μm or more and 50 μm or less, more preferably 6 μm or more and 40 μm or less, and particularly preferably 10 μm or more and 30 μm or less. Thereby, the printing density, the printing unevenness suppressing property, the blocking resistance and the curl suppressing property can be further improved.

The first resin layer can be formed by melt-extruding the above resin composition onto the base material on the base material.
Further, in the first resin layer, the above resin composition is dispersed in water or an appropriate solvent, or the resin composition is dissolved in water or an appropriate solvent to prepare a coating liquid, which is applied onto the substrate. To form a coating film, which can be dried. As the coating means, a means selected from a roll coating method, a reverse roll coating method, a gravure coating method, a reverse gravure coating method, a bar coating method, a rod coating method and the like can be used.
It can also be formed by adhering a film composed of the above resin composition to a base material via a conventionally known adhesive.
The first resin layer can be a thick layer and can be easily adjusted. From the viewpoint of curl suppression, the first resin layer is formed by melt extrusion of a resin composition. It is preferably a melt-extruded resin layer.

(Second resin layer)
The resin composition constituting the second resin layer contains at least one resin material, and includes, for example, polyester, polyamide, polyolefin, vinyl resin, (meth) acrylic resin, imide resin, cellulose resin, styrene resin, polycarbonate, and ionomer. Examples thereof include a resin and a copolymer of the monomers constituting the resin material.
Among these, polyolefin is preferable, and PP is more preferable. Thereby, the printing density, the printing unevenness suppressing property, and the blocking resistance can be further improved.
Further, the resin composition constituting the second resin layer may contain two or more kinds of resin materials.

The second resin layer can contain the above-mentioned additive.

The thermal conductivity of the resin composition constituting the second resin layer is preferably less than 0.19 W / m · K, and more preferably less than 0.15 W / m · K. Thereby, the image density can be further improved.
The thermal conductivity is preferably 0.05 W / m · K or more, and more preferably 0.07 W / m · K or more. As a result, the image density can be further improved while suppressing the occurrence of creases during the production of the printed matter.

The flexural modulus of the resin composition constituting the second resin layer is preferably more than 300 MPa, more preferably more than 500 MPa. Thereby, the printing unevenness suppression property and the blocking resistance can be further improved.
The flexural modulus is preferably 1800 MPa or less, and more preferably 1450 MPa or less. Thereby, the printing unevenness suppression property and the blocking resistance can be further improved.

The density of the resin composition constituting the second resin layer ^{is preferably 0.83 g / cm 3} or more and 0.97 g / cm ³ or less, and more preferably 0.86 g / cm ³ or more and 0.94 g / cm ³ or less. Thereby, the curl suppressing property can be further improved.

The thickness of the second resin layer is preferably 1 μm or more and 50 μm or less, more preferably 6 μm or more and 50 μm or less, and particularly preferably 10 μm or more and 40 μm or less. Thereby, the image density, the printing unevenness suppressing property, the blocking resistance and the curl suppressing property can be further improved.

The second resin layer can be formed by melt-extruding the above resin composition onto the first resin layer or the like.
Further, in the second resin layer, the resin composition is dispersed in water or a suitable solvent, or the resin composition is dissolved in water or a suitable solvent to prepare a coating liquid, and the coating liquid is prepared by the coating means. , A coating film is formed by applying it on a first resin layer or the like, and this can be formed by drying.
Further, the second resin layer can be formed by adhering the film composed of the above resin composition to the first resin layer via a conventionally known adhesive.
Further, the resin composition constituting the first resin layer is melt-extruded between the base material and the film (second resin layer) composed of the resin composition, and these are passed between the rollers. By crimping, the first resin layer and the second resin layer can be formed at the same time.
The second resin layer can be a thick layer and can be easily adjusted. From the viewpoint of curl suppression, the second resin layer is formed by melt extrusion of the resin composition. It is preferably a melt-extruded resin layer.

(Back resin layer)
In one embodiment, the image receiving paper support includes a back surface resin layer on a surface opposite to the surface on which the first resin layer of the base material is provided. Thereby, the curl suppression property and the transferability in the printer can be improved.

The back surface resin layer is composed of a resin composition containing at least one resin material.
Examples of the resin material include polyester, polyamide, polyolefin, vinyl resin, (meth) acrylic resin, imide resin, cellulose resin, styrene resin, polycarbonate, ionomer resin, and copolymers of monomers constituting these resin materials. Can be mentioned. Among these, polyolefin is preferable.
The resin composition constituting the second resin layer may contain two or more kinds of resin materials.
Preferably, the resin composition constituting the back surface resin layer contains HDPE or a blended resin of HDPE and LDPE. Thereby, the curl suppression property and the transferability in the printer can be further improved.
In the blend resin of HDPE and LDPE, the content ratio of HDPE to LDPE (HDPE content / LDPE content) is preferably 1/9 or more and 9/1 or less, and 3/7 or more and 9 or less on a mass basis. 1/1 or less is more preferable. Thereby, the curl suppression property and the transferability in the printer can be further improved.

The back surface resin layer can contain the above additives.

The thermal conductivity of the resin composition constituting the back surface resin layer is preferably 0.2 W / m · K or more and 0.6 W / m · K or less, and 0.25 W / m · K or more and 0.5 W / m · K or less. Is more preferable. As a result, it is possible to further improve the transportability in the printer while suppressing the printing wrinkles and kogation in the printed matter.

The flexural modulus of the resin composition constituting the back surface resin layer is preferably 50 MPa or more and 5000 MPa or less, and more preferably 80 MPa or more and 4000 MPa or less. As a result, it is possible to further improve the transportability in the printer while suppressing the print wrinkles and kogation in the printed matter.

The thickness of the first resin layer × the flexural modulus of the first resin layer is A, the thickness of the second resin layer × the flexural modulus of the second resin layer is B, and the thickness of the back surface resin layer × the flexural modulus of the back surface resin layer When C is, it is preferable that A, B and C satisfy the following formula. As a result, the curl inhibitory property can be further improved or deteriorated.
0.7 ≤ A + B / C ≤ 1.5

The thickness of the back surface resin layer is preferably 1 μm or more and 50 μm or less, more preferably 6 μm or more and 40 μm or less, and particularly preferably 13 μm or more and 28 μm or less. Thereby, the curl suppressing property can be further improved.

The back surface resin layer can be formed by melt-extruding the above resin composition onto a base material.
The resin composition is dispersed in water or a suitable solvent, or the resin composition is dissolved in water or a suitable solvent to prepare a coating liquid, which is applied onto a substrate by the coating means. It can be formed by forming a coating film and drying it.
It can also be formed by adhering a film composed of the above resin composition to a base material via a conventionally known adhesive.
Since the back surface resin layer can be easily adjusted to a suitable thickness and the curl suppressing property can be further improved, the back surface resin layer may be a melt extruded resin layer formed by melt extrusion of the resin composition. preferable.

(Other resin layer)
The image receiving paper support may be provided with another resin layer between the first resin layer and the second resin layer as long as the characteristics of the image receiving paper support of the present disclosure are not impaired. A plurality of the resin layers may be provided.

The other resin layer is composed of a resin composition containing at least one resin material.
Examples of the resin material include polyester, polyamide, polyolefin, vinyl resin, (meth) acrylic resin, imide resin, cellulose resin, styrene resin, polycarbonate, ionomer resin, and copolymers of monomers constituting the resin material. Can be mentioned.
The resin composition constituting the other resin layer may contain two or more kinds of resin materials.

In addition, the other resin layer may contain the above-mentioned additive as long as the characteristics of the image receiving paper support of the present disclosure are not impaired.

The thermal conductivity of the resin material constituting the other resin layer is higher than the thermal conductivity of the resin composition constituting the second resin layer and lower than the thermal conductivity of the resin composition constituting the first resin layer. Is preferable.

The flexural modulus of the resin material constituting the other resin layer is higher than the flexural modulus of the resin composition constituting the first resin layer and lower than the flexural modulus of the resin composition constituting the second resin layer. Is preferable.

The thickness of the other resin layers is not particularly limited, but is preferably 1 μm or more and 50 μm or less from the viewpoint of curl suppression.

The other resin layer can be formed by melt-extruding the resin composition onto the first resin layer or the like.
Further, for the other resin layer, the above resin composition is dispersed in water or an appropriate solvent, or the above resin composition is dissolved in water or an appropriate solvent to prepare a coating liquid, and the above coating means is used. , A coating film is formed by applying it on a first resin layer or the like, and this can be formed by drying.
Further, another resin layer can be formed by adhering the film composed of the above resin composition to the first resin layer via a conventionally known adhesive.
Further, when the first resin layer is a melt-extruded resin layer, another resin layer can be formed by laminating a film composed of the above resin composition via the first resin layer.
Since the other resin layers can be easily adjusted to a suitable thickness and the curl suppressing property can be further improved, the back surface resin layer is a melt-extruded resin layer formed by melt-extruding the resin composition. Is preferable.

(Back layer)
In one embodiment, the image receiving paper support includes a back surface layer under the back surface resin layer. As a result, it is possible to improve the transportability at the time of printing by the grip roller type printer, and also to improve the writeability on the back surface side.

The back surface layer can have a conventionally known configuration. In one embodiment, the back surface layer comprises a resin material such as polyester, polyamide, polyolefin, vinyl resin, (meth) acrylic resin, imide resin, cellulose resin, styrene resin, polycarbonate and ionomer resin.

The thickness of the back surface layer can be 0.5 μm or more and 5 μm or less.

(Image receiving paper)
As shown in FIG. 3, the image receiving paper 20 of the present disclosure includes the image receiving paper support 10 and a receiving layer 21 provided on the second resin layer 13.
In one embodiment, the image receiving paper 20 includes a primer layer between the second resin layer 13 and the receiving layer 21 (not shown).

The thermal conductivity of the image receiving paper is preferably 0.3 W / m · K or more and 0.53 W / m · K or less, and more preferably 0.37 W / m · K or more and 0.45 W / m · K or less. Thereby, the image density can be further improved.

Martens hardness of the image receiving paper, 2N / mm ² or more 3.55N / mm ² or less, and more preferably 2.15N / mm ² or more 2.9 N / mm ² or less. Thereby, the printing unevenness suppression property and the blocking resistance can be further improved.
In the present disclosure, the measurement of the Martens hardness of the image receiving paper is based on ISO14577-1, and an ultrafine hardness tester (Picotender HM-500 manufactured by Fisher Instruments Co., Ltd.) is used. The measurement conditions are as follows.
(Measurement condition)
・ Temperature: 100 ℃
・ Relative humidity: 50%
・ Maximum test load: 500mN
・ Maximum depth: 150 μm
・ Load time: 5 seconds

(Receptive layer)
The receiving layer is a layer that receives the sublimation dye transferred from the color material layer included in the thermal transfer sheet and maintains the formed image.

The receiving layer contains a resin material. The resin material is not limited as long as it is a resin that is easily dyed with a dye. For example, an olefin resin, a vinyl resin, a (meth) acrylic resin, a cellulose resin, an ester resin, an amide resin, a carbonate resin, or a styrene resin. , Urethane resin, ionomer resin and the like. The receiving layer can contain two or more of the above resin materials.

The content of the resin material in the receiving layer is preferably 80% by mass or more and 98% by mass or less, and more preferably 90% by mass or more and 98% by mass or less.

In one embodiment, the receptive layer comprises a release agent. Thereby, the releasability from the thermal transfer sheet can be improved.
Examples of the release agent include solid waxes, surfactants, silicone oils, silicone resins and the like.
Examples of solid waxes include polyethylene wax, amide wax, Teflon (registered trademark) powder and the like.
Examples of the surfactant include a fluorine-based surfactant and a phosphoric acid ester-based surfactant.
As the silicone oil, for example, modified silicone oil is preferable. Examples of the modified silicone oil include amino-modified silicone, epoxy-modified silicone, aralkyl-modified silicone, epoxy-aralkyl-modified silicone, alcohol-modified silicone, vinyl-modified silicone and urethane-modified silicone. Of these, epoxy-modified silicones, aralkyl-modified silicones or epoxy-aralkyl-modified silicones are particularly preferable. The receiving layer can contain two or more of the above release agents.

The content of the release agent in the receiving layer is preferably 0.5% by mass or more and 20% by mass or less, and more preferably 0.5% by mass or more and 10% by mass or less. As a result, the releasability from the thermal transfer sheet can be improved while maintaining the transparency of the receiving layer.

The receiving layer can include the above-mentioned additive.

The thickness of the receiving layer is preferably 0.5 μm or more and 20 μm or less, and more preferably 1 μm or more and 10 μm or less. Thereby, the image density formed on the receiving layer can be improved. Moreover, curl can be suppressed.

In the receiving layer, the above-mentioned material is dispersed in water or a suitable solvent, or the above-mentioned material is dissolved in water or a suitable solvent to prepare a coating liquid, and the above-mentioned coating means is used on the second resin layer or the like. It can be formed by applying it to a coating film and drying it.

(Primer layer)
In one embodiment, the image receiving paper of the present disclosure includes a primer layer between the second resin layer and the receiving layer. Thereby, the adhesion between layers can be improved.

The primer layer contains at least one resin material, and examples thereof include polyester, polyamide, polyolefin, vinyl resin, (meth) acrylic resin, imide resin, cellulose resin, styrene resin, polycarbonate and ionomer resin.

The primer layer can contain the above additives.

The thickness of the primer layer is not particularly limited, and can be, for example, 0.1 μm or more and 5 μm or less.

In the primer layer, the material is dispersed in water or a suitable solvent, or the material is dissolved in water or a suitable solvent to prepare a coating liquid, which is applied onto the second resin layer by the coating means. To form a coating film, which can be dried.

Hereinafter, the present disclosure will be described in more detail with reference to Examples, but the present disclosure is not limited to these Examples.

Example 1
As a base material, a coated paper having a thickness of 130 μm (Daio Paper Corporation, S Utrilo Coat 157) was prepared, and an α-olefin copolymer (manufactured by Mitsui Chemicals, Inc.) was prepared on one surface of the base material. Toughmer (registered trademark) A-4070S, density 0.893 g / cm ³ ) was melt-extruded to form a first resin layer having a thickness of 15 μm. The thermal conductivity of the α-olefin copolymer was measured according to ASTM C 177-04 and found to be 0.23 W / m · K.
The flexural modulus of the α-olefin copolymer was measured using an Instron universal testing machine in accordance with JIS K 7171 (issued in 2016) and found to be 50 MPa.

Random polypropylene (PP) (Random Polypro F329RA, manufactured by Prime Polymer Co., Ltd.) was melt-extruded onto the first resin layer to form a second resin layer having a thickness of 15 μm. The thermal conductivity of the random PP was 0.12 W / m · K, and the flexural modulus was 15 MPa.

The following resin composition for forming a back surface resin layer was melt-extruded on the other surface of the base material to form a back surface resin layer having a thickness of 15 μm to prepare a support for image receiving paper.
The thermal conductivity of the resin assembly organisms constituting the back surface resin layer was measured in accordance with ASTM C 177-04 and found to be 0.46 W / m · K.
<Resin composition for forming a back surface resin layer> (Indicated as blend resin A in Table 1)
80 parts by mass of high-density polyethylene (HDPE) (manufactured by Japan Polyethylene Corporation, Novatec (registered trademark) HS471, density 0.956 g / cm ³ )
20 parts by mass of low density polyethylene (LDPE) (manufactured by Japan Polyethylene Corporation, Novatec (registered trademark) LC600A, density 0.918 g / cm ³ )

A coating liquid for forming a receiving layer having the following composition was applied onto the second resin layer of the support for image receiving paper and dried to form a receiving layer having a thickness of 3 μm to prepare an image receiving paper.
<Coating liquid for forming a receptive layer>
60 parts by mass of vinyl chloride-vinyl acetate copolymer (manufactured by Nissin Chemical Industry Co., Ltd., Solveine (registered trademark) C)
-Epoxy-modified silicone resin 1.2 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., X-22-3000T)
-Methylstill-modified silicone resin 0.6 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., X-24-510)
-Methyl ethyl ketone (MEK) 2.5 parts by mass-Toluene 2.5 parts by mass

Examples 2-8 and Comparative Examples 1-3
An image receiving paper was produced in the same manner as in Example 1 except that the configurations of the first resin layer, the second resin layer, and the back surface resin layer were changed as shown in Table 1.
The materials in Table 1 are as follows.
-Ethylene-methacrylic acid copolymer (EMAA): manufactured by Mitsui Dow Polychemical Co., Ltd., Nuclel (registered trademark) AN4233C, density 0.93 g / cm ³ )
-Homo PP: Random Polypro F109V manufactured by Prime Polymer Co., Ltd.
The compositions of the blended resin B and the blended resin C in Table 1 are as follows.
<Blend resin B: Density 0.886 g / cm ³ >
・ 60 parts by mass of α-olefin copolymer ・ 40 parts by mass of random PP

<Blend resin C: Density 0.89 g / cm ³ >
・ 50 parts by mass of α-olefin copolymer ・ 50 parts by mass of random PP

<< Measurement of thermal conductivity >>
The thermal conductivity of the image receiving paper produced in Examples and Comparative Examples was measured by a thermal conductivity meter (Kyoto Denshi Kogyo Co., Ltd., QTM-500) in accordance with JIS R 2616 (Transient Hot Wire Method). .. The results are shown in Table 1.
The thermal conductivity was measured from the receiving layer side of the image receiving paper in a room temperature environment (24 ° C.).

<< Measurement of Martens hardness >>
The Martens hardness of the image receiving paper produced in Examples and Comparative Examples was measured by an ultra-micro hardness tester (manufactured by Pico Tender HM-500 Fisher Instruments Co., Ltd.) in accordance with ISO14577-1 under the following measurement conditions. bottom. The results are shown in Table 1.
The Martens hardness was measured from the receiving layer side of the image receiving paper in a room temperature environment (24 ° C.).
(Measurement condition)
・ Temperature: 100 ℃
・ Relative humidity: 50%
・ Maximum test load: 500mN
・ Maximum depth: 150 μm
・ Load time: 5 seconds

<< Image density evaluation >>
On the receiving layer of the image receiving paper produced in Examples and Comparative Examples, a sublimation type thermal transfer printer (manufactured by Dai Nippon Printing Co., Ltd., trade name: DS620) and a genuine thermal transfer ink sheet of the printer (manufactured by Dai Nippon Printing Co., Ltd.) ) Was used to form a solid black image (0/255 image gradation) to prepare a printed matter.
The formed image density (OD value) of the printed matter was measured using the following optical densitometer (manufactured by X-Rite, i1Pro2), and evaluated based on the following evaluation criteria. The evaluation results are shown in Table 1.
(Measurement condition)
-Density status: Status A
-Measurement lighting conditions: M0 (ISO 13655-2009)

(Evaluation criteria)
A: The OD value was 2 or more.
B: The OD value was 1.8 or more and less than 2.
NG: The OD value was less than 1.8.

<< Evaluation of print unevenness suppression >>
On the receiving layer of the image receiving paper manufactured in Examples and Comparative Examples, a sublimation type thermal transfer printer (manufactured by Dai Nippon Printing Co., Ltd., trade name: DS620) and a genuine thermal transfer ink sheet of the printer (manufactured by Dai Nippon Printing Co., Ltd.) ) Was used to form a half-gray solid image (128/255 image gradation) to prepare a printed matter. The obtained printed matter was visually observed and evaluated based on the following evaluation criteria. The evaluation results are shown in Table 1.
(Evaluation criteria)
A: No unevenness was confirmed.
B: Mild unevenness was confirmed.
C: Unevenness was confirmed, but there was no problem in actual use.
NG: Unevenness was confirmed, and there was a problem in actual use.

<< Blocking resistance evaluation >>
The support for image receiving paper obtained in Examples and Comparative Examples was prepared, and two test pieces cut into a size of 5 cm × 5 cm were prepared. The test pieces were superposed so that one first resin layer and the other back surface resin layer were in contact with each other, and stored in an oven at 50 ° C. for 24 hours while applying a load of 0.2 MPa. The test pieces after storage were peeled off by hand and evaluated according to the following criteria.
(Evaluation criteria)
A: No sticking was confirmed B: Mild sticking was confirmed.
C: Sticking was confirmed, but there was no problem in actual use.
NG: Sticking was confirmed, and there was a problem in actual use.

<< Evaluation of curl suppression >>
Preparation of image-receiving paper of reference example The above-mentioned coated paper with a thickness of 130 μm is used as a base material, and a porous PP film with a thickness of 35.75 μm as a second resin layer (manufactured by Mitsui Chemicals Tohcello Corporation, SP-U, flexural modulus). 1875 MPa and density 0.63 g / cm ³ ) were prepared respectively.

LDPE is melt-extruded between the base material and the second resin layer, and these are passed between the press roller and the cooling roller and pressure-bonded to form a thickness 15 composed of the base material and LDPE. A laminate having a first resin layer of .3 μm and a second resin layer was obtained.

The blend resin A was melt-extruded on the other surface of the base material to form a back surface resin layer having a thickness of 25.3 μm to obtain a support for image receiving paper.

A coating liquid for forming a receiving layer having the above composition was applied onto the second resin layer of the support for image-receiving paper and dried to form a receiving layer having a thickness of 3 μm to prepare a receiving paper of a reference example.

The curl-suppressing properties of the image-receiving papers of Examples 1 and 3 and the image-receiving papers of the reference example were evaluated by the following procedure. The results are shown in Table 2.

<Measurement of curl amount in high humidity environment>
(1) Each image receiving paper was cut into a size of 152 mm in width.
(2) The test piece was wound so that the receiving layer provided on the test piece was on the outside, and the unwinding tip was taped to obtain a roll-shaped test piece having an outer diameter of 60 mm. The tape portion was provided over the entire width direction of the test piece.
(3) The roll-shaped test piece was allowed to stand for 2 weeks in an environment (high humidity environment) at 40 ° C. and a relative humidity of 90%.
(4) After standing, the roll-shaped test piece was unwound, and 30 mm was cut from the unwinding tip.
(5) The image receiving paper was cut so that the length from the cut end was 203 mm, and a test piece having a width of 152 mm and a length of 203 mm was prepared.
(6) The test piece was placed on a flat table. Specifically, in the case of a curl in which the receiving layer surface side is concave, it is placed on a flat table so that the receiving layer surface is on the top, and in the case of a curl in which the receiving layer surface side is convex, the receiving layer surface is on the bottom. Placed on a flat table.
(7) The lifting height of the four corners was measured, and the maximum value was taken as the curl amount in a low humidity environment.

<Measurement of curl amount in low humidity environment>
The curl amount in a low humidity environment was measured in the same manner as in the measurement of the curl amount in a high humidity environment, except that the standing environment in the step (3) was changed to 50 ° C. and a relative humidity of 13% (low humidity environment). The results are shown in Table 2.
<Evaluation>
The difference between the curl amount in a low humidity environment and the curl amount in a high humidity environment was calculated, and the absolute value was evaluated based on the following evaluation criteria. The results are shown in Table 2.
(Evaluation criteria)
A: The absolute value of the difference in curl amount was less than 15 mm.
B: The absolute value of the difference in curl amount was 15 mm or more.

Hereinafter, a specific embodiment of the image-receiving paper support and the image-receiving paper of the present disclosure will be shown, but the image-receiving paper support and the image-receiving paper of the present disclosure are not limited thereto.

The image receiving paper support of the present disclosure includes a base material, a first resin layer, and a second resin layer.
The thermal conductivity of the resin composition constituting the first resin layer is higher than the thermal conductivity of the resin composition constituting the second resin layer.
The flexural modulus of the resin composition constituting the first resin layer is lower than the flexural modulus of the resin composition constituting the second resin layer, and the support for image receiving paper for providing the receiving layer on the second resin layer side. Is.

In one embodiment, the image receiving paper support includes a back surface resin layer on a surface opposite to the surface on which the first resin layer of the base material is provided.

The image-receiving paper of the present disclosure is characterized by including the above-mentioned support for image-receiving paper and a receiving layer provided on the second resin layer.

In one embodiment, the thermal conductivity of the image receiving paper is 0.3 W / m · K or more and 0.53 W / m · K or less.

In one embodiment, Martens hardness of the image receiving sheet is 2N / mm ² or more 3.55N / mm ² or less.

In one embodiment, the flexural modulus of the resin composition constituting the first resin layer is 300 MPa or less.

In one embodiment, the flexural modulus of the resin composition constituting the first resin layer is 20 MPa or more and 1500 MPa or less lower than the flexural modulus of the resin composition constituting the second resin layer.

In one embodiment, the thickness of the second resin layer is 6 μm or more and 50 μm or less.

10: Support for image receiving paper, 11: Base material, 12: First resin layer, 13: Second resin layer, 14: Back surface resin layer, 20: Image receiving paper, 21: Receptive layer

Claims (8)

A base material, a first resin layer, and a second resin layer are provided in this order.
The thermal conductivity of the resin composition constituting the first resin layer is higher than the thermal conductivity of the resin composition constituting the second resin layer.
The flexural modulus of the resin composition constituting the first resin layer is lower than the flexural modulus of the resin composition constituting the second resin layer.
A support for image receiving paper for providing a receiving layer on the second resin layer side. The support for image-receiving paper according to claim 1, wherein a back surface resin layer is provided on a surface of the base material opposite to the surface on which the first resin layer is provided. An image receiving paper comprising the support for image receiving paper according to claim 1 or 2 and a receiving layer provided on the second resin layer. The image receiving paper according to claim 3, wherein the thermal conductivity is 0.3 W / m · K or more and 0.53 W / m · K or less. Martens hardness is 2N / mm ² or more 3.55N / mm ² or less, the image receiving paper according to claim 3 or 4. The image receiving paper according to any one of claims 3 to 5, wherein the flexural modulus of the resin composition constituting the first resin layer is 300 MPa or less. Any one of claims 3 to 6, wherein the flexural modulus of the resin composition constituting the first resin layer is 200 MPa or more and 1500 MPa or less lower than the flexural modulus of the resin composition constituting the second resin layer. The image receiving paper described in the section. The image receiving paper according to any one of claims 3 to 7, wherein the thickness of the second resin layer is 6 μm or more and 50 μm or less.

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