JP2022153495A - Thermal transfer image receiving body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal transfer image receiving sheet and a thermal transfer image receiving body such as a card which have reception layers having good releasability with a coloring material layer without containing a releasing agent, and a thermal transfer image receiving body having a reception layer which has high heat resistance and blocking resistance, and enables formation of an image having high concentration.

SOLUTION: A thermal transfer image receiving body has a base material, and a reception layer on the base material, where the reception layer contains a resin having an aromatic hydrocarbon group, an aliphatic hydrocarbon group and a hydroxyl group, and a curing agent.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to thermal transfer receivers. More particularly, it relates to a thermal transfer image receptor comprising a substrate and a receiving layer containing a specific resin material and a curing agent on the substrate.

As a method of forming an image using thermal transfer, a thermal transfer sheet provided with a coloring material layer containing a sublimation dye on a substrate, and a thermal transfer image receiving sheet, an IC card, and an ID having a receiving layer provided on the substrate. A sublimation-type thermal transfer method is known in which a thermal transfer image receiving material such as a card is superimposed and a sublimation dye contained in a color material layer of the thermal transfer sheet is transferred onto the receiving layer to form a thermal transfer image. Since sublimation dyes are used in the sublimation type thermal transfer method, it is excellent in halftone reproducibility and gradation, and can clearly express an image as the original on the receiving layer.

By the way, when a thermal transfer image is formed using a sublimation thermal transfer method, if the releasability between the colorant layer of the thermal transfer sheet and the receiving layer of the thermal transfer image receptor is low, the colorant layer sticks to the receiving layer. As a result, when the coloring material layer is peeled off from the receiving layer after image formation, peeling noise is generated, running failure, peeling marks, etc. are generated, and the quality of the image formed on the receiving layer is deteriorated. problems may occur.
Also, due to sticking between the receiving layer and the coloring material layer, abnormal transfer may occur, such as the coloring material layer itself being transferred or the receiving layer being taken to the thermal transfer sheet side.
Therefore, good releasability is required between the colorant layer of the thermal transfer sheet and the receiving layer of the thermal transfer image receptor.

In order to improve the releasability between the color material layer of the thermal transfer sheet and the receiving layer of the thermal transfer image receiving member, Patent Document 1 proposes that the receiving layer contains a release agent such as silicone.

However, depending on the type of release agent used, release properties may vary greatly depending on the printing environment and storage environment, and high-quality images may not be obtained, and there is room for improvement in release properties. was there.
In addition, the use of a release agent reduces the heat resistance, causing the image formed on the receiving layer to blur when left in a high-temperature environment, and the use of a release agent increases the manufacturing cost. there were.

Here, Patent Document 2 proposes a thermal transfer image-receiving sheet in which a receptive layer contains a copolymer composed of an alkyl acrylate and an aromatic hydrocarbon or the like to improve releasability.

In addition, the receiving layer is required to be capable of forming an image having a sufficiently high density, and to prevent adhesion between the receiving layer of the thermal transfer sheet and the base material (anti-blocking property) during winding and storage.

Japanese Patent Application Laid-Open No. 2007-90650 JP 2009-228256 A

The present invention has been made in view of the above background art, and provides good releasability from a colorant layer without containing a release agent, high heat resistance and blocking resistance, and high It is an object of the present invention to provide a thermal transfer receiver having a receiving layer capable of forming a density image.

A thermal transfer image receptor of the present invention comprises a substrate and a receptor layer on the substrate, wherein the receptor layer comprises a resin having an aromatic hydrocarbon group, an aliphatic hydrocarbon group and a hydroxyl group, and It is characterized by containing a curing agent.

In the above aspect, the resin having an aromatic hydrocarbon group, an aliphatic hydrocarbon group and a hydroxyl group has a unit (a) having an aromatic hydrocarbon group, a unit (b) having an aliphatic hydrocarbon group and a hydroxyl group It can contain unit (c).

In the above aspect, the proportion of the unit (a) having an aromatic hydrocarbon group is 35% by mass with respect to 100% by mass of all structural units constituting the resin having an aromatic hydrocarbon group, an aliphatic hydrocarbon group and a hydroxyl group. % or more and 80 mass % or less, the proportion of units (b) having an aliphatic hydrocarbon group is 10 mass % or more and 60 mass % or less, and the proportion of units (c) having a hydroxyl group is 0.1 mass % or more. , 20% by mass or less.

In the above aspect, the peak top temperature of the receiving layer can be 45° C. or higher and 100° C. or lower.

In the above aspect, the number of carbon atoms in the aliphatic hydrocarbon group of the unit (b) having an aliphatic hydrocarbon group can be 2 or more and 24 or less.

In the above aspect, the resin having an aromatic hydrocarbon group, an aliphatic hydrocarbon group and a hydroxyl group can have a weight average molecular weight of 50,000 or more.

In the above aspect, the content ratio of the curing agent to the resin having an aromatic hydrocarbon group, an aliphatic hydrocarbon group and a hydroxyl group in the receiving layer is 5/95 or more and 30/70 or less on a mass basis. can be

In the above aspect, the unit (a) having an aromatic hydrocarbon group can be a structural unit derived from a compound represented by the following general formula (1).

In the above aspect, the unit (b) having an aliphatic hydrocarbon group can be a structural unit derived from a (meth)acrylate having an aliphatic hydrocarbon group.

In the above aspect, the unit (c) having an acid group can be a structural unit derived from a (meth)acrylate having a hydroxyl group.

In the above aspect, the receiving layer can contain an ultraviolet absorber having a hydroxyl group.

In the above aspect, a second receiving layer can be further provided between the substrate and the receiving layer.

In the above embodiment, the second receiving layer can contain a butyral resin and a hardener.

In the above aspect, a third receiving layer containing a resin material, a curing agent, and an ultraviolet absorber having a hydroxyl group can be further provided between the substrate and the second receiving layer.

In the above aspect, the substrate can be a card substrate having an information recording function.

According to the present invention, there is provided a receiving layer which has good releasability from a colorant layer without containing a release agent, has high heat resistance and blocking resistance, and is capable of forming a high-density image. It is possible to provide a thermal transfer receiver comprising:

FIG. 1 is a schematic cross-sectional view showing one embodiment of the thermal transfer image receiving member of the present invention. FIG. 2 is a schematic cross-sectional view showing one embodiment of the thermal transfer image receiving member of the present invention. FIG. 3 is a schematic cross-sectional view showing one embodiment of the thermal transfer image receiving member of the present invention. FIG. 4 is a schematic cross-sectional view showing one embodiment of the thermal transfer image receiving member of the present invention. FIG. 5 is a diagram for explaining the peak top temperature in the DSC curve.

Thermal Transfer Image Receptor The thermal transfer image receptor 10 of the present invention comprises at least a substrate 20 and a receiving layer 30 on the substrate 20, as shown in FIG.
In one embodiment, the thermal transfer image receiver 10 comprises a second receptive layer 40 between the substrate 20 and the receptive layer 30, as shown in FIG.
In one embodiment, the thermal transfer image receptor 10 comprises a substrate 20 and a receiving layer 30, as shown in FIG. 2 base sheets 70 are provided in this order, and an IC chip 80 and an antenna body 90 are embedded in the adhesive layer 60 .
In one embodiment, the thermal transfer image receptor 10 comprises a second receiving layer 40 and a third receiving layer 100 between the substrate 20 and the receiving layer 30, as shown in FIG.
Further, in one embodiment, the thermal transfer image receiving material may have other layers such as a cushion layer, a porous layer and/or an information recording layer between the substrate and the receiving layer (not shown). ).
Each layer included in the thermal transfer image receiving member of the present invention will be described in detail below.

Substrate The substrate in the present invention has the role of holding the receptive layer, and since heat is applied during thermal transfer, it should be a material having mechanical strength to the extent that handling is not hindered even in a heated state. preferable.

Such substrates include, for example, condenser paper, glassine paper, sulfate paper, paper with a high degree of size, synthetic paper (polyolefin-based, polystyrene-based), fine paper, art paper, coated paper, cast-coated paper, and wallpaper. , backing paper, synthetic resin or emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin inner lined paper, cardboard, etc., cellulose fiber paper, or polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN) ), polyester resins such as polyethylene terephthalate-isophthalate copolymer, polyamide resins such as nylon-6 and nylon-6,6, polyolefin resins such as polyethylene, polypropylene, and polymethylpentene, vinyl such as polyvinyl chloride (Meth)acrylic resins such as polyacrylate, polymethacrylate, and polymethyl methacrylate, imide resins such as polyimide and polyetherimide, polyarylate, polysulfone, polyethersulfone, polyphenylene ether, polyphenylene sulfide (PPS ), engineering resins such as polyaramid, polyetherketone, polyethernitrile, polyetheretherketone, polyethersulfite, polycarbonate, polystyrene, high-impact polystyrene, acrylonitrile-styrene copolymer (AS resin) and acrylonitrile-butadiene- Films containing resin materials such as styrene-based resins such as styrene copolymers (ABS resin), and cellulose-based resins such as cellophane, cellulose acetate, and nitrocellulose can be used.
Moreover, the film described above may be a void film having microvoids therein.
Furthermore, the substrate may be obtained by laminating two or more of the substrates described above by a known method such as a dry lamination method, a wet lamination method, or a melt lamination method.

Further, the base material may be a card base material having an information recording function such as a magnetic layer, an optical recording layer, or a built-in IC chip.
In one embodiment, the card substrate comprises a first substrate sheet, an adhesive layer and a second substrate sheet in this order, and the adhesive layer contains an IC chip and a coiled antenna connected thereto. An electronic component composed of a body is embedded. A film containing the resin material described above can be used as the base sheet. As the adhesive that can be used to form the adhesive layer, conventionally known adhesives can be used without particular limitation, and examples thereof include ethylene-vinyl acetate copolymer, polyester-based, polyamide-based, and polyolefin-based adhesives.
From the viewpoint of the smoothness of the substrate, it is preferable that the electronic component is enclosed as an inlet in the adhesive layer between the first substrate sheet and the second substrate sheet.
An inlet is an electronic component placed on or sandwiched between a porous resin film, a porous expandable resin film, a flexible resin sheet, a porous resin sheet, or a non-woven fabric sheet.

The thickness of the base material is preferably changed appropriately according to the application of the thermal transfer image receiving material. The substrate to be provided can have a thickness of 300 μm or more and 1000 μm or less.

Moreover, in order to improve the blocking resistance, the surface of the base material can be roughened, if necessary. Examples of means for forming unevenness on the substrate include matting agent kneading, sandblasting, hairline processing, mat coating, chemical etching, and the like. When mat coating treatment is performed, organic substances such as crosslinked acrylic resins and crosslinked styrene resins, and inorganic substances such as silicon dioxide, zinc oxide and titanium dioxide can be used.

Receiving layer The receiving layer in the present invention contains a resin having an aromatic hydrocarbon group, an aliphatic hydrocarbon group and a hydroxyl group, and a curing agent, and receives sublimable dyes transferred from the thermal transfer sheet during image formation by thermal transfer. By retaining the received sublimable dyes to the receiving layer, an image can be formed and maintained on the surface of the receiving layer.

A resin having an aromatic hydrocarbon group, an aliphatic hydrocarbon group and a hydroxyl group (hereinafter sometimes referred to as "resin X") has (1) an aromatic A resin containing a unit having a hydrocarbon group, a unit having an aliphatic hydrocarbon group and a unit having a hydroxyl group, (2) a resin containing a unit having an aromatic hydrocarbon group and an aliphatic hydrocarbon group and a unit having a hydroxyl group, (3) a resin containing a unit having an aromatic hydrocarbon group and a hydroxyl group and a unit having an aliphatic hydrocarbon group; and (4) a unit having an aromatic hydrocarbon group and a unit having an aliphatic hydrocarbon group and a hydroxyl group. (1) a resin containing a unit having an aromatic hydrocarbon group, a unit having an aliphatic hydrocarbon group and a unit having a hydroxyl group, i.e., an aromatic hydrocarbon group and a double A compound having a bond, a compound having an aliphatic hydrocarbon group and a double bond, and a copolymer of a compound having a hydroxyl group and a double bond are preferred.

The weight average molecular weight of resin X is preferably 50,000 or more, more preferably 55,000 or more. Moreover, it is preferable that it is 200,000 or less. This can further improve the releasability and heat resistance of the receiving layer.
In the present invention, the weight average molecular weight means a polystyrene equivalent value measured by gel permeation chromatography (GPC) according to JIS K 7251-1 (2008).

The peak top temperature of the receptor layer is preferably 45° C. or higher and 100° C. or lower, more preferably 50° C. or higher and 90° C. or lower, and even more preferably 50° C. or higher and 80° C. or lower. By setting the peak top temperature within the above numerical range, the releasability, heat resistance and blocking resistance of the receiving layer can be further improved. Also, the density of the image formed on the receiving layer can be further improved.
In the present invention, the peak top temperature of the receiving layer can be measured using a differential scanning calorimeter (DSC). Specifically, using a DSC-60 manufactured by Shimadzu Corporation, the temperature was adjusted to 7.5°C/min. It can be measured by measuring the heat quantity change at the primary heating rate of .
The peak top temperature is the temperature T1 at the peak top X in the DSC curve as shown in FIG.
In the present invention, the peak top temperature of the receptive layer is measured after the receptive layer-forming coating solution is coated on the base material, dried, and cured. receive. Therefore, the peak top temperature is a different parameter than the glass transition temperature, which is usually measured before curing.

The content of the resin X in the receiving layer is preferably 50% by mass or more and 95% by mass or less, more preferably 70% by mass or more and 90% by mass or less. By setting the content of the resin X contained in the receiving layer within the above numerical range, the reaction with the curing agent proceeds well, and the releasability of the receiving layer and the density of the image formed on the receiving layer are further improved. can improve.

Hereinafter, the case where the resin X is a resin containing a unit having an aromatic hydrocarbon group, a unit having an aliphatic hydrocarbon group and a unit having a hydroxyl group will be described in detail.

Unit (a) having an aromatic hydrocarbon group
Unit (a) having an aromatic hydrocarbon group is a structural unit derived from a compound having an aromatic hydrocarbon group and a double bond.

上記式中、Ａは芳香族炭化水素基を表す。
本発明において、「芳香族炭化水素基」とは、芳香環を含む炭化水素基のことを指し、この芳香環は、炭素数１以上、２４以下のアルキル基、ハロゲン原子、炭素数２以上、２４以下のアルコキシ基の内、少なくともいずれか１つによって置換されていてもよい。
芳香族炭化水素基としては、例えば、フェニル基、ナフチル基、アントラニル基、ベンジル基、フェネチル基、トリル基、キシリル基、エチルフェニル基等が挙げられる。
上記した中でも、離型性という観点から、フェニル基およびベンジル基が好ましく、フェニル基が特に好ましい。
また、上記式中、Ｂは水素、芳香族炭化水素基または炭素数１以上、１０以下の脂肪族炭化水素基を表し、好ましくは水素を表す。 In one embodiment, the compound having an aromatic hydrocarbon group and a double bond is represented by general formula (1) below. By including a structural unit derived from a compound represented by the following general formula (1), the resin X can improve the heat resistance and blocking resistance of the receiving layer.

In the above formula, A represents an aromatic hydrocarbon group.
In the present invention, the "aromatic hydrocarbon group" refers to a hydrocarbon group containing an aromatic ring, and the aromatic ring is an alkyl group having 1 to 24 carbon atoms, a halogen atom, 2 or more carbon atoms, It may be substituted with at least one of 24 or less alkoxy groups.
Examples of aromatic hydrocarbon groups include phenyl, naphthyl, anthranyl, benzyl, phenethyl, tolyl, xylyl, and ethylphenyl groups.
Among the above, from the viewpoint of releasability, a phenyl group and a benzyl group are preferable, and a phenyl group is particularly preferable.
In the above formula, B represents hydrogen, an aromatic hydrocarbon group or an aliphatic hydrocarbon group having 1 to 10 carbon atoms, preferably hydrogen.

Examples of compounds satisfying the general formula (1) include styrene (St), α-methylstyrene, α-ethylstyrene, α-propylstyrene, 4-methylstyrene, 4-ethylstyrene, 3-phenylpropylene, 4 -phenylbutylene, diphenylethylene and the like. Among these, St, α-methylstyrene, α-ethylstyrene, 4-methylstyrene and 4-ethylstyrene are preferred.

In another embodiment, units (a) having aromatic hydrocarbon groups and double bonds are structural units derived from (meth)acrylates having aromatic groups.
In the present invention, (meth)acrylate refers to acrylate or methacrylate.

(Meth)acrylates having an aromatic group include phenyl acrylate (PA), phenyl methacrylate (PMA), 4-methylphenyl acrylate (4MPA), 4-methylphenyl methacrylate (4MPMA), 4-ethylphenyl acrylate (4EPA). , 4-ethylphenyl methacrylate (4EPMA), benzyl acrylate (BzA), benzyl methacrylate (BzMA), 4-methylbenzyl acrylate (4MBzA), 4-methylbenzyl methacrylate (4MBzMA), 4-ethylbenzyl acrylate (4EBzA), 4 -ethylbenzyl methacrylate (4EBzMA) and the like.

When the total constituent units contained in Resin X are 100% by mass, the constituent ratio of the unit (a) having an aromatic hydrocarbon group is preferably 35% by mass or more and 80% by mass or less, and 40% by mass. Above, it is more preferable that it is 75 mass % or less. This can further improve the heat resistance and blocking resistance of the receiving layer.

Unit (b) having an aliphatic hydrocarbon group
Unit (b) having an aliphatic hydrocarbon group is a structural unit derived from a compound having an aliphatic hydrocarbon group and a double bond.

In one embodiment, the compound having an aliphatic hydrocarbon group and a double bond is a (meth)acrylate-derived structural unit having an aliphatic hydrocarbon group.

The number of carbon atoms in the aliphatic hydrocarbon group is preferably 2 or more and 24 or less, more preferably 4 or more and 18 or less. By setting the number of carbon atoms in the aliphatic hydrocarbon group within the above numerical range, the releasability of the receiving layer can be further improved.
Also, the aliphatic hydrocarbon group may be linear, branched, or cyclic.

Examples of aliphatic hydrocarbon groups include n-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, and n-undecyl. group, n-dodecyl group, n-tridecyl group, n-tetradecyl group, n-pentadecyl group, n-hexadecyl group, cyclopentyl group, cyclohexyl group, isobornyl group and the like.

(Meth)acrylates having an aliphatic hydrocarbon group include ethyl acrylate (EA), ethyl methacrylate (EMA), butyl acrylate (BA), butyl methacrylate (BMA), lauryl acrylate (LA), lauryl methacrylate (LMA), Stearyl acrylate (SA), stearyl methacrylate (SMA), isobornyl acrylate (IBXA), isobornyl methacrylate (IBXMA) and the like. Among these, LA, SMA and LMA are preferable from the viewpoint of releasability.

In addition to (meth)acrylates having an aliphatic hydrocarbon group, compounds having an aliphatic hydrocarbon group and a double bond include propylene, 1-butene, 2-butene, 1-pentene, 2-pentene, and 1-hexene. , 2-hexene, 3-hexene, 1-heptene, 2-heptene, 3-heptene, 1-octene, 2-octene, 3-octene and 4-octene.

The proportion of the unit (b) having an aliphatic hydrocarbon group is preferably 10% by mass or more and 60% by mass or less, preferably 15% by mass, based on 100% by mass of all structural units contained in the resin X. Above, it is more preferable that it is 55 mass % or less. This can further improve the releasability of the receiving layer.

Unit (c) having a hydroxyl group
A unit (c) having a hydroxyl group is a structural unit derived from a compound having a hydroxyl group and a double bond.

In one embodiment, the compound having a hydroxyl group and a double bond is a structural unit derived from a (meth)acrylate having a hydroxyl group.
In the present invention, the hydroxyl group may be directly bonded to this (meth)acrylate, or bonded via a straight or branched chain hydrocarbon group having 2 to 18 carbon atoms. There may be.

(Meth)acrylates having a hydroxyl group include 2-hydroxyethyl acrylate (2HEA), 2-hydroxyethyl methacrylate (2HEMA), 2-hydroxypropyl acrylate (2HPA), 2-hydroxypropyl methacrylate (2HPMA), 4-hydroxybutyl Acrylate (4HBA), 4-hydroxybutyl methacrylate (4HBMA) and the like.

Besides (meth)acrylates having a hydroxyl group, examples of compounds having a hydroxyl group and a double bond include alkenols such as propenyl alcohol, 3-butene-1-ol, and 2-butene-1,4-diol.

The proportion of the unit (c) having a hydroxyl group is preferably 0.1% by mass or more and 20% by mass or less, preferably 1% by mass or more, It is more preferably 10% by mass or less. This can further improve the releasability of the receiving layer and the density of the image formed on the receiving layer.

Particularly preferably, the receiving layer contains St as a unit having an aromatic hydrocarbon group, LMA as a unit having an aliphatic hydrocarbon group, resin X1 containing 2-HEMA as a unit having a hydroxyl group, and an aromatic hydrocarbon group St as a unit having , LA as a unit having an aliphatic hydrocarbon group, and resin X2 containing 2-HEMA as a unit having a hydroxyl group. This can further improve the releasability and heat resistance of the receiving layer.

In this case, the content ratio of X1 and X2 (content of X1/content of X2) is preferably 1/9 or more and 5/5 or less, 2/8 or more, and 4/ It is more preferably 6 or less. This can further improve the releasability and heat resistance of the receiving layer.

Examples of curing agents contained in the curing agent- receiving layer include polyfunctional isocyanate compounds, carbodiimide compounds, epoxy compounds, oxazoline compounds, and the like.
Among the curing agents described above, polyfunctional isocyanate compounds are preferred, and polyfunctional isocyanate compounds include xylene diisocyanate (XDI), hexamethylene diisocyanate (HDI), tolylene diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate ( MDI) and the like.
Among the polyfunctional isocyanate compounds described above, XDI and HDI are preferable from the viewpoint of preventing yellowing of the receiving layer.

In the receiving layer, the content ratio of the curing agent to the resin X (curing agent/resin X) is preferably 5/95 or more and 30/70 or less, and is preferably 10/90 or more and 20/ It is more preferably 80 or less. By setting the content ratio of the curing agent to the resin X within the above numerical range, the releasability of the receptive layer and the density of the image formed on the receptive layer can be further improved.

The receiving layer may contain a resin other than the resin X as long as the effect of the present invention is not impaired, and may contain, for example, the resin materials described above.

The ultraviolet absorbent- receiving layer preferably contains an ultraviolet absorbent having a hydroxyl group. The present inventors have found that the ultraviolet absorber having a hydroxyl group reacts with the resin X and the curing agent in the receiving layer, thereby significantly improving the light fastness of the thermal transfer image receiving material, and the image formed on the receiving layer. fading and discoloration can be prevented. In addition, the present inventors found that the receiving layer containing an ultraviolet absorber improves the light resistance as compared with the case where the optionally provided second and third receiving layers described below contain an ultraviolet absorber. We have learned that it can be further improved.

UV absorbers having a hydroxyl group include 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, 2,4-bis(2-hydroxy-4 -butoxyphenyl)-6-(2,4-dibutoxyphenyl)-1,3,5-triazine, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxy Benzophenone, 2,2′,4,4′-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2,2′-methylenebis[6-(2H-benzotriazol-2-yl )-4-(hydroxymethyl)phenol], 2,2′-methylenebis[6-(2H-benzotriazol-2-yl)-4-(2-hydroxyethyl)phenol], 2,2′-methylenebis[6 -(5-chloro-2H-benzotriazol-2-yl)-4-(2-hydroxyethyl)phenol], 2,2′-methylenebis[6-(2H-benzotriazol-2-yl)-4-( 3-hydroxypropyl)phenol], 2,2′-methylenebis[6-(5-chloro-2H-benzotriazol-2-yl)-4-(3-hydroxypropyl)phenol], 2,2′-methylenebis[ 6-(5-bromo-2H-benzotriazol-2-yl)-4-(3-hydroxypropyl)phenol], 2,2′-methylenebis[6-(2H-benzotriazol-2-yl)-4- (2-hydroxypropyl)phenol], 2,2′-methylenebis[6-(5-chloro-2H-benzotriazol-2-yl)-4-(2-hydroxypropyl)phenol], 2,2′-methylenebis [6-(5-bromo-2H-benzotriazol-2-yl)-4-(2-hydroxypropyl)phenol], 2,2′-methylenebis[6-(2H-benzotriazol-2-yl)-4 -(4-hydroxybutyl)phenol] and 2,2′-methylenebis[6-(5-chloro-2H-benzotriazol-2-yl)-4-(4-hydroxybutyl)phenol] and other phenolic hydroxyl groups and 2-(2′-hydroxy-3′,5′-dipentylphenyl)benzotriazole, 2-(2′-hydroxy-3′,5′-di-tert-butylphenyl)-5-chlorobenzo Triazo 2-(2-hydroxy-5-t-butylphenyl)-2H-benzotriazole, 2-hydroxy-4-n-octoxybenzophenone, 2-(2-hydroxy-5-t-octylphenyl)-2H -benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3'-tert-amyl-5'- isobutylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3'-isobutyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3'-isobutyl-5 Those having an alcoholic hydroxyl group such as '-propylphenyl)-5-chlorobenzotriazole and 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole are included. The receiving layer can contain two or more ultraviolet absorbers.

The content of the ultraviolet absorber in the receiving layer is preferably 1% by mass or more and 30% by mass or less, more preferably 5% by mass or more and 20% by mass or less. By setting the content of the ultraviolet absorber within the above numerical range, the light resistance of the thermal transfer image receiving material can be further improved.

The receiving layer may contain additives such as antioxidants, light stabilizers, fillers, pigments, antistatic agents, plasticizers, etc., as long as they do not impair the effects of the present invention. The receiving layer of the thermal transfer image receiving member of the present invention exhibits excellent releasability even without containing a release agent. You can stay.

The thickness of the receiving layer is preferably 0.1 μm or more and 10 μm or less, more preferably 0.5 μm or more and 5 μm or less. By setting the thickness of the receiving layer within the above numerical range, it is possible to form an image with a higher density.

Other Layers The thermal transfer image receiving material of the present invention may comprise other layers such as a second receiving layer, a third receiving layer, a porous layer, an information recording layer, etc., in addition to the substrate and the receiving layer. .

Second receiving layer The thermal transfer image receiving material of the present invention may further comprise a second receiving layer between the substrate and the receiving layer. By including the second receiving layer in the thermal transfer image receiving member, a higher density image can be formed on the receiving layer. In addition, since the sublimation dye migrates to the second receiving layer, the storage stability of the formed image can be improved, and the heat resistance of the thermal transfer image receiving member can be further improved.

The second receiving layer can contain the above-described resin materials, additives, and the like.
Among the resin materials described above, the second receiving layer preferably contains a vinyl-based resin, and particularly preferably contains polyvinyl butyral. Thereby, the density and storage stability of the formed image can be further improved.

The content of the vinyl resin in the second receptor layer is preferably 40% by mass or more and 98% by mass or less, more preferably 50% by mass or more and 97% by mass or less. By setting the content of the vinyl resin within the above numerical range, the density and storage stability of the formed image can be further improved.

Moreover, the second receiving layer preferably contains the curing agent described above, and more preferably contains a polyfunctional isocyanate compound.
In the second receiving layer, the content ratio of the curing agent and the resin material (curing agent/resin material) is preferably 5/95 or more and 25/75 or less, preferably 10/90 or more, on a mass basis. It is more preferably 20/80 or less. By setting the content ratio of the curing agent and the resin material within the above numerical range, the density and storage stability of the formed image can be further improved.

The second receiving layer can contain an ultraviolet absorber having a hydroxyl group, and the content thereof is preferably 1% by mass or more and 30% by mass or less, and 5% by mass or more and 20% by mass or less. It is more preferable to have By setting the content of the ultraviolet absorber within the above numerical range, the light resistance of the receiving layer can be further improved.

The thickness of the second receiving layer is preferably 1 μm or more and 10 μm or less, more preferably 2 μm or more and 5 μm or less. By setting the thickness of the second receiving layer within the above numerical range, it is possible to form an image with a higher density on the receiving layer and to further improve the storage stability of the formed image. Moreover, the heat resistance of the thermal transfer image receiving material can be further improved.

Third Receiving Layer The thermal transfer image receiving material of the present invention further comprises a third receiving layer containing a resin material, a curing agent and the above-mentioned hydroxyl group-containing UV absorber between the substrate and the second receiving layer. may be provided. By including the third receiving layer in the thermal transfer image receiving member, fading and discoloration of the image formed on the receiving layer can be effectively prevented.

As the resin material contained in the third receiving layer, the above-mentioned materials can be used. Therefore, it is preferable that the vinyl resin is included.

The content of the vinyl resin in the third receiving layer is preferably 40% by mass or more and 98% by mass or less, more preferably 50% by mass or more and 97% by mass or less. By setting the content of the vinyl-based resin within the above numerical range, the adhesion between the substrate and the second receiving layer can be further improved.

As the curing agent contained in the third receiving layer, those mentioned above can be used, but it is more preferable to contain a polyfunctional isocyanate compound.
In the third receiving layer, the content ratio of the curing agent and the resin material (curing agent/resin material) is preferably 5/95 or more and 25/75 or less, preferably 10/90 or more, on a mass basis. It is more preferably 20/80 or less. By setting the content ratio of the curing agent to the resin material within the above numerical range, the density and storage stability of the formed image can be further improved.

Further, the third receiving layer contains the ultraviolet absorber having a hydroxyl group, and the content thereof is preferably 1% by mass or more and 30% by mass or less, and is 5% by mass or more and 20% by mass or less. is more preferred. By setting the content of the ultraviolet absorber within the above numerical range, the light resistance of the receiving layer can be further improved.

Porous Layer The thermal transfer image receiving material of the present invention may have a porous layer between the substrate and the receiving layer. By providing the thermal transfer image receiving member with the porous layer, it is possible to prevent heat transfer loss of heat applied during image formation.
In one embodiment, the porous layer has a heat insulating property capable of preventing loss of heat applied during image formation by thermal transfer due to heat transfer to a substrate or the like, and contains hollow particles.
Also, in another embodiment, a void film having microvoids therein may be used as the porous layer.

In addition, the porous layer includes gelatin and derivatives thereof, polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone, pullulan, carboxymethyl cellulose, hydroxyethyl cellulose, dextran, dextrin, polyacrylic acid and salts thereof, agar, κ-carrageenan, λ- Binders such as carrageenan, iota-carrageenan, casein, xanthan gum, locust bean gum, alginic acid, and gum arabic may be included.

The thickness of the porous layer is not particularly limited, but may be 5 μm or more and 40 μm or less.

Cushion layer The thermal transfer image receiving material of the present invention may have a cushion layer between the substrate and the receiving layer.
By providing the thermal transfer image receiving member with the cushion layer, the density of the image formed on the receiving layer can be further improved.
In one embodiment, the cushion layer includes an actinic radiation curable resin.
In the present invention, the actinic ray-curable resin refers to a resin that is cured by irradiation with actinic rays such as visible light, ultraviolet rays, X-rays, electron beams, α-rays, β-rays, and γ-rays. A resin obtained by curing an active curable resin is called an actinic ray curable resin.

The actinic radiation-curable resin is not particularly limited, and conventionally known ones can be used.
In one embodiment, the actinic radiation-curable resin contains polyester (meth)acrylate, epoxy (meth)acrylate, melamine (meth)acrylate, triazine (meth)acrylate, polysiloxane (meth)acrylate, and 2-ethylhexyl as polymer components. acrylates, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, glycerol acrylate, tetrahydrofurfuryl acrylate, phenoxyethyl acrylate, nonylphenoxyethyl acrylate, tetrahydrofurfuryloxyethyl acrylate, tetrahydrofurfuryloxyhexanolide acrylate, etc. Become.

In one embodiment, the cushion layer can also contain a polymerization initiator. As the polymerization initiator, benzoin-based, acetophenone-based, thioxanthone-based, phosphine oxide-based, and peroxide-based initiators can be used, and more specifically, benzoin, benzophenone, 4,4-bis(diethylamino). Benzophenone, 2,4,6-trimethylbenzophenone, methyl orthobenzoylbenzoate, 4-phenylbenzophenone, 2-methyl-[4-(methylthio)phenyl]-morpholino-1-propanone, isopropylthioxanthone, 2,4,6- trimethylbenzoyldiphenylphosphine oxide, methylbenzoyl formate and the like. The cushion layer may contain two or more of the above polymerization initiators.

The thickness of the cushion layer is preferably 3 μm or more and 50 μm or less, more preferably 5 μm or more and 30 μm or less, and even more preferably 5 μm or more and 20 μm or less.

Information Recording Layer When the thermal transfer image receiving member is used as a card such as an IC card, an information recording layer may be provided on any layer of the thermal transfer image receiving member. The information recording layer is a layer in which image information such as facial photographs and character information such as card type, name, address, date of birth, and expiration date (hereinafter collectively referred to as personal information) are recorded. In addition to image information and character information, format printing such as frames of image information and fixed characters other than character information may be applied.

Image information and character information are printed on the information recording layer by receiving a sublimation dye or thermally diffusible dye by a thermal transfer recording method. Therefore, it is preferable that the information recording layer is made of a material that easily accepts a thermally migratable coloring material such as a sublimation dye or a hot-melt ink. Conventionally known resin materials can be used as such materials, and examples include polyolefin resins, vinyl resins, polyester resins, polystyrene resins, polyamide resins, cellulose resins, polycarbonate resins, (meth) acrylic Resin etc. are mentioned.

Also, conventionally known dyes can be used for recording information.
For example, azomethines such as diarylmethane dyes, triarylmethane dyes, thiazole dyes, merocyanine dyes, pyrazolone dyes, methine dyes, indocyanine dyes, acetophenone azomethine, pyrazoloazomethine, imidazolazomethine, pyridone azomethine dyes, xanthene dyes, oxazine dyes, cyanostyrene dyes, thiazine dyes, azine dyes, acridine dyes, benzene azo dyes, pyridone azo, thiophenazo, isothiazole azo, pyrrole azo, pyrazole azo, imidazole azo, thiazole Examples include azo dyes such as azo, triazole azo and disazo, spiropyran dyes, indolinospiropyran dyes, fluoran dyes, rhodaminelactam dyes, naphthoquinone dyes, anthraquinone dyes, quinophthalone dyes and the like.

The thickness of the information recording layer is generally preferably 0.5 μm or more and 10 μm or less, more preferably 1 μm or more and 5 μm or less.

Method for Producing a Thermal Transfer Image Receptor The method for producing a thermal transfer image receptor of the present invention comprises the steps of preparing a base material, and applying a receiving layer forming coating solution containing a resin X, a curing agent and an organic solvent on the base material. The method is characterized by including a step of forming a receiving layer.

Step of Preparing Substrate The method of the present invention comprises a step of preparing a substrate, and the substrate may be prepared by a conventionally known method or commercially available.
For example, the above void film having microvoids inside can be produced by kneading inorganic particles into a resin material and stretching the mixture to form a film. Within this void film, voids are formed with inorganic particles as nuclei.
A void film can also be obtained by kneading a first resin material and a second resin material incompatible with this resin material and stretching the mixture to form a film.
Also, the card base material can be obtained by using an adhesive between the first base sheet and the second base sheet, sandwiching the inlet, and thermally compressing them using a laminate roller or the like. . The heating temperature is preferably 50° C. or higher and 130° C. or lower, and more preferably 50° C. or higher and 100° C. or lower. The pressure during pressurization is preferably 0.196 MPa or more and 0.98 MPa or less.

The process of forming the receptive layer The receptive layer is formed by coating a base material with a coating solution for forming the receiving layer in which the resin X or the like is dispersed or dissolved in a solvent, by a slide coating method, a gravure coating method, a roll coating method, a screen printing method, a It can be formed by coating by a conventionally known method such as a reverse roll coating method and then drying. Solvents that can be used are not particularly limited, but acetone, methyl ethyl ketone (MEK), toluene, xylene and the like can be used.

Step of forming other layers Other layers such as the second receiving layer, the third receiving layer, the porous layer and the information recording layer are formed by dispersing or dissolving the materials constituting each layer in a solvent in the same manner as the receiving layer. It can be formed by applying a coating solution on a base material or the like and drying the coating solution.
When the porous layer is composed of a void film, it can be formed by the same method as for the substrate.
Also, the cushion layer can be formed by dispersing or dissolving the materials constituting each layer in a solvent to form a coating liquid, coating the liquid on a substrate or the like, and then irradiating it with actinic rays.

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

Example 1
Preparation of Thermal Transfer Image Receiving Sheet 1 Using (U292W-188, manufactured by Teijin DuPont Films Ltd.) as a base sheet, a receiving layer forming coating liquid 1 having the following composition was applied by gravure coating to obtain a thickness when dried. It was coated and dried to obtain a thermal transfer image-receiving sheet 1 (layer structure: base material/receiving layer).
<Composition of Receiving Layer Forming Coating Liquid 1>
・Resin Xa 85% by mass
(Styrene (St): butyl methacrylate (BMA): 2-hydroxyethyl methacrylate (2HEMA) = 70:20:10, weight average molecular weight: 6.40 × 10 ⁴ ) · isocyanate curing agent 15% by mass
(Takenate (registered trademark) D-110N, manufactured by Mitsui Chemicals, Inc.)
・MEK 200% by mass ・Toluene 200% by mass

Example 2
Preparation of Thermal Transfer Image Receiving Sheet 2 Example 1 except that resin Xb (St:lauryl acrylate (LA):2HEMA=70:20:10, weight average molecular weight: 8.53×10 ⁴ ) was used instead of resin Xa. A thermal transfer image-receiving sheet 2 was obtained in the same manner as above.

Example 3
Preparation of Thermal Transfer Image Receiving Sheet 3 Thermal transfer image receiving sheet 3 was obtained in the same manner as in Example 2, except that the amount of resin Xb used was changed to 95% by mass and the amount of isocyanate curing agent used was changed to 5% by mass.

Example 4
Thermal transfer image receiving sheet 4 was prepared in the same manner as in Example 1 except that resin Xc (St:LA:2HEMA=80:10:10, weight average molecular weight: 8.95×10 ⁴ ) was used instead of resin Xa. A thermal transfer image receiving sheet 4 was obtained.

Example 5
Thermal transfer image receiving sheet 5 was prepared in the same manner as in Example 1 except that resin Xd (St:LA:2HEMA=60:30:10, weight average molecular weight: 8.88×10 ⁴ ) was used instead of resin Xa. A thermal transfer image receiving sheet 5 was obtained.

Example 6
Preparation of Thermal Transfer Image Receiving Sheet 6 Example 1 except that resin Xe (St: stearyl methacrylate (SMA): 2HEMA=70:20:10, weight average molecular weight: 9.58×10 ⁴ ) was used instead of resin Xa. A thermal transfer image-receiving sheet 6 was obtained in the same manner as above.

Example 7
Preparation of Thermal Transfer Image Receiving Sheet 7 Example 1 except that resin Xf (St:lauryl methacrylate (LMA):2HEMA=70:20:10, weight average molecular weight: 8.61×10 ⁴ ) was used instead of resin Xa. A thermal transfer image-receiving sheet 7 was obtained in the same manner as above.

Example 8
Preparation of Thermal Transfer Image Receiving Sheet 8 Example 1 except that resin Xg (St: ethyl acrylate (EA): 2HEMA=70:20:10, weight average molecular weight: 9.03×10 ⁴ ) was used instead of resin Xa. A thermal transfer image-receiving sheet 8 was obtained in the same manner as above.

Example 9
Preparation of Thermal Transfer Image Receiving Sheet 9 Except for using resin Xh (St: isobornyl methacrylate (IBXMA): 2HEMA=40:50:10, weight average molecular weight: 7.72×10 ⁴ ) instead of resin Xa, A thermal transfer image-receiving sheet 9 was obtained in the same manner as in 1.

Example 10
Preparation of thermal transfer image receiving sheet 10
A thermal transfer image-receiving sheet 10 was obtained in the same manner as in Example 1, except that the receptor layer-forming coating liquid was changed to the receptor layer-forming coating liquid 1a having the following composition.
<Composition of Receiving Layer Forming Coating Liquid 1a>
・Resin Xf 25% by mass ・Resin Xb 60% by mass ・Isocyanate curing agent 15% by mass
(Takenate (registered trademark) D-110N, manufactured by Mitsui Chemicals, Inc.)
・MEK 200% by mass ・Toluene 200% by mass

Example 11
Preparation of thermal transfer image-receiving sheet 11 As a base sheet (manufactured by Teijin DuPont Films Japan Ltd., U292W-188, thickness 188 μm), a coating liquid 2 for forming a receiving layer having the following composition was dried to a thickness of 3 μm. and dried to form a second receiving layer.
On this second receiving layer, the coating liquid used for forming the receiving layer in Example 2 was applied so that the thickness when dry was 1 μm, dried to form the first receiving layer, and thermal transfer image receiving layer was formed. A sheet 11 (layer structure: substrate/second receiving layer/first receiving layer) was obtained.
<Composition of Receiving Layer Forming Coating Liquid 2>
・ Butyral (manufactured by Sekisui Chemical Co., Ltd., S-Lec (registered trademark) BL-S) 95% by mass
・Isocyanate curing agent 5% by mass
(Takenate D-110N, manufactured by Mitsui Chemicals, Inc.)
・MEK 200% by mass
・Toluene 200% by mass

Example 12
Preparation of thermal transfer image-receiving sheet 12 Thermal transfer was carried out in the same manner as in Example 11, except that the receiving layer-forming coating liquid used for forming the first receiving layer was changed to receiving layer-forming coating liquid 1b having the following composition. An image receiving sheet 12 was obtained.
<Composition of Receiving Layer Forming Coating Liquid 1b>
・Resin Xb 77% by mass
・Isocyanate curing agent 13% by mass
(Takenate (registered trademark) D-110N, manufactured by Mitsui Chemicals, Inc.)
・Ultraviolet absorber having a hydroxyl group 10% by mass
(UVA-40KT manufactured by BASF Japan Co., Ltd.)
・MEK 200% by mass
・Toluene 200% by mass

Example 13
Preparation of thermal transfer image-receiving sheet 13 Thermal transfer was carried out in the same manner as in Example 11, except that the receiving layer-forming coating liquid used for forming the first receiving layer was changed to receiving layer-forming coating liquid 1c having the following composition. An image receiving sheet 13 was obtained.
<Composition of Receiving Layer Forming Coating Liquid 1c>
・Resin Xb 77% by mass
・Isocyanate curing agent 13% by mass
(Takenate (registered trademark) D-110N, manufactured by Mitsui Chemicals, Inc.)
・Ultraviolet absorber having a hydroxyl group 10% by mass
(BASF Japan Ltd., Tinuvin (registered trademark) 900)
・MEK 200% by mass
・Toluene 200% by mass

Example 14
Preparation of thermal transfer image-receiving sheet 14 Using a substrate sheet (manufactured by Teijin DuPont Films Ltd., U292W-188, thickness 188 μm), a thickness of 3 μm after drying a receiving layer forming coating liquid 3 having the following composition. and dried to form a third receiving layer.
<Composition of Receiving Layer Forming Coating Liquid 3>
・ Butyral (manufactured by Sekisui Chemical Co., Ltd., S-Lec (registered trademark) BL-S) 57% by mass
・Isocyanate curing agent 3% by mass
(Takenate (registered trademark) D-110N, manufactured by Mitsui Chemicals, Inc.)
・Ultraviolet absorber having a hydroxyl group 40% by mass
(UVA-40KT manufactured by BASF Japan Co., Ltd.)
・MEK 200% by mass
・Toluene 200% by mass

Onto the third receiving layer, the receiving layer forming coating solution 2 having the composition described above was coated and dried to a thickness of 3 μm when dried to form a second receiving layer.
On this second receiving layer, the coating liquid used for forming the receiving layer in Example 2 was applied so that the thickness when dry was 1 μm, dried to form the first receiving layer, and thermal transfer image receiving layer was formed. A sheet 14 (layer structure: substrate/third receiving layer/second receiving layer/first receiving layer) was obtained.

Example 15
Preparation of thermal transfer image-receiving sheet 15 Thermal transfer was performed in the same manner as in Example 14, except that the receiving layer-forming coating liquid used for forming the first receiving layer was changed to the receiving layer-forming coating liquid 1b having the above composition. An image receiving sheet 15 was obtained.

Example 16
Preparation of IC card: On the base sheet of the thermal transfer image-receiving sheet obtained in Example 10 opposite to the side on which the receiving layer is provided, a hot-melt adhesive (Macroplast QR3460 manufactured by Henkel) is attached to another sheet. (manufactured by Teijin DuPont Films Ltd., U292W-188, thickness 188 μm) were laminated together, and an electronic component was embedded in the adhesive layer formed by the adhesive.
Next, this laminate was trimmed using a roll cutter to produce an IC card with a thermal transfer image-receiving sheet having a thickness of 790 μm and a size of 55 mm×85 mm (length×width).

Comparative example 1
Preparation of Thermal Transfer Image Receiving Sheet A Resin Xi (St: methacrylic acid (MAA)=70:30, weight average molecular weight: 1.52×10 ⁴ ) was used instead of resin Xa, and no curing agent was used. obtained a thermal transfer image-receiving sheet A in the same manner as in Example 1.

Comparative example 2
Preparation of thermal transfer image-receiving sheet B A thermal transfer image-receiving sheet B was obtained in the same manner as in Example 2, except that no curing agent was used.

Performance Evaluation of Thermal Transfer Image Receptor For the thermal transfer image receptors produced in the above Examples and Comparative Examples, (1) measurement of peak top temperature, (2) evaluation of releasability, (3) evaluation of heat resistance, and (4) image density. Evaluation, (5) blocking resistance evaluation and (6) light resistance test were performed. Table 2 summarizes the measurement results.

(1) Measurement of peak top temperature DSC-60), the primary heating rate: 7.5 ° C./min. Measured at

(2) Releasability Evaluation A dye layer provided in a sublimation thermal transfer sheet prepared by the following method and a receiving layer of a thermal transfer image receiving material prepared in Examples and Comparative Examples were superimposed, and the printer under the following conditions was used to print on the receiving layer. to form an image.
After image formation, the tensile strength (peel force) when peeling the sublimation thermal transfer sheet from the thermal transfer image receiving material at a peeling angle of 50° is provided between the take-up roll of the sublimation thermal transfer sheet and the thermal head in the printer. It was measured using a tension meter (ASK-100, manufactured by Okura Industry Co., Ltd.). Table 2 summarizes the measurement results. As is clear from the measurement results, the peel force when using the thermal transfer image receiving member obtained in the example was 2.94 N/cm or less, indicating that it has high releasability.

(Preparation of Sublimation Thermal Transfer Sheet)
A coating solution for forming a heat-resistant lubricating layer having the following composition was coated on a 4.5 μm-thick easy-adhesion-treated PET film as a substrate, and dried to a thickness of 0.8 μm when dried. A heat-resistant lubricating layer was formed on one surface of the A primer layer coating solution having the following composition was applied to the other surface of the base material so that the dry thickness was 0.1 μm to form a primer layer. Next, a coating solution for forming a yellow dye layer, a coating solution for forming a magenta dye layer, and a coating solution for forming a cyan dye layer having the following components were applied onto the primer layer so that the thickness when dried was 0.6 μm. The layers were successively coated and dried to form a dye layer to obtain a thermal transfer sheet.
<Coating solution for forming heat-resistant lubricating layer>
・Polyvinyl acetal 60.8% by mass
(Sekisui Chemical Co., Ltd., S-Lec (registered trademark) KS-1)
・Isocyanate curing agent 4.2% by mass
(Burnock (registered trademark) D750 manufactured by DIC Corporation)
・ Filler (zinc stearyl phosphate) 10% by mass
(Manufactured by Sakai Chemical Industry Co., Ltd., LBT1830 refined)
・ Filler (zinc stearate) 10% by mass
(SZ-PF, manufactured by Sakai Chemical Industry Co., Ltd.)
・Filler (polyethylene wax) 3% by mass
(Polywax 3000 manufactured by Toyo Adol Co., Ltd.)
・Filler (ethoxylated alcohol-modified wax) 7% by mass
(Unitox (registered trademark) 750, manufactured by Toyo Adol Co., Ltd.)
・Toluene 200% by mass
・Methyl ethyl ketone (MEK) 100% by mass
<Coating solution for forming primer layer>
・ Alumina sol (average primary particle size 10 × 100 nm (solid content 10%)) 30% by mass
(Nissan Chemical Co., Ltd., Aluminasol 200)
・Polyvinylpyrrolidone (PVP) 3% by mass
(manufactured by ISP Japan, K-90)
・Water 50% by mass
・Isopropanol (IPA) 17% by mass
<Coating solution for forming yellow dye layer>
・Disperse Yellow 201 4.0% by mass
・Polyvinyl acetal 3.5% by mass
(Sekisui Chemical Co., Ltd., S-Lec (registered trademark) KS-5)
・Polyethylene wax 0.1% by mass
・MEK 45.0% by mass
・Toluene 45.0% by mass
<Coating solution for forming magenta dye layer>
・Disperse Red 60 1.5% by mass
・Disperse Violet 26 2.0% by mass
・Polyvinyl acetal 4.0% by mass
(Sekisui Chemical Co., Ltd., S-Lec (registered trademark) KS-5)
・Polyethylene wax 0.1% by mass
・MEK 45.0% by mass
・Toluene 45.0% by mass
<Coating solution for forming cyan dye layer>
・Solvent Blue 63 2.0% by mass
・Disperse Blue 354 2.0% by mass
・Polyvinyl acetal 3.5% by mass
(Sekisui Chemical Co., Ltd., S-Lec (registered trademark) KS-5)
・Polyethylene wax 0.1% by mass
・MEK 45.0% by mass
・Toluene 45.0% by mass

(printer)
Thermal head: KEE-57-12GAN2-STA (manufactured by Kyocera Corporation)
Heating element average resistance: 3303Ω
Main scanning direction print density: 300dpi
Sub-scanning direction print density: 300dpi
Printing voltage: 27V
Line cycle: 1.0 msec. / line
Print start temperature: 35°C
Pulse duty ratio: 85%
Printing start temperature: 29-36°C
Distance from heat generation point to release plate: 4.5 mm
Conveying speed: 84.6 mm/sec.
Printing pressure: 7-8kgf

(3) Evaluation of Heat Resistance Using the printer and thermal transfer sheet described above, an image was formed on the receiving layer of the thermal transfer image receptors produced in Examples and Comparative Examples. After image formation, the thermal transfer image-receiving sheet was placed in an oven at 60° C. and stored for 7 days. Bleeding of the image after storage was visually observed and evaluated according to the following criteria. In the thermal transfer image receiving members obtained in Comparative Examples 1 and 2, the releasability between the receiving layer and the dye layer of the thermal transfer sheet was low, and an image could not be formed satisfactorily. could not be measured.
A: The image was clear without bleeding.
B: Almost no bleeding occurred in the image.
NG: Bleeding occurred in the image.

(4) Evaluation of Image Density Using the printer and thermal transfer sheet described above, an image was formed on the receiving layer of the thermal transfer image receptors produced in Examples and Comparative Examples. The optical reflection density of the formed image was measured using an optical densitometer (spectrometer SpectroLino manufactured by X-Rite), and the maximum value was taken as the image density. Table 2 summarizes the measurement results. As is clear from the measurement results, the image density in the case of using the thermal transfer image receiving member obtained in the example was 1.4 or more, indicating that it has high printability. In the thermal transfer image receiving members obtained in Comparative Examples 1 and 2, the releasability between the receiving layer and the dye layer of the thermal transfer sheet was low, and an image could not be formed satisfactorily. could not be measured.

(5) Evaluation of Blocking Resistance The thermal transfer image receiving members produced in the above examples and comparative examples were cut into a size of 10 cm×15 cm, and two samples each were produced. This sample was superimposed so that one receiving layer and the other substrate were in contact with each other, and stored in an oven at 50° C. for 96 hours while applying a load of 20 kg. For the samples after storage, the thermal transfer image receiving members were separated by hand and evaluated according to the following criteria.
A: The thermal transfer image receiving members could be easily peeled off from each other.
NG: It felt heavy and it was difficult to separate the thermal transfer image receiving members. or could not be removed.

(6) Evaluation of Light Resistance Using the printer and thermal transfer sheet described above, an image was formed on the receiving layer of the thermal transfer image receptors produced in Examples and Comparative Examples. The OD value of the formed image was measured with an optical densitometer (spectrometer SpectroLino manufactured by X-Rite).

The formed image was irradiated with light under the following conditions using a super xenon weather meter SX75 (manufactured by Suga Test Instruments Co., Ltd.).
(Irradiation conditions)
・Illuminance: 48W/ ^m2
・Irradiation time: 96 hours ・BPT (black panel temperature): 50°C
・Humidity: 50%

The OD value of the image after light irradiation is measured in the same manner as above, and the fading rate is obtained by the formula (1-OD value after light resistance test/OD value before light resistance test) x 100, based on the following evaluation criteria. evaluated.
(Evaluation criteria)
A: Fading rate was less than 5%.
B: Fading rate was 5% or more and less than 10%.
C: Fading rate was 10% or more.

10: thermal transfer image receptor, 20: base material, 30: receiving layer, 40: second receiving layer, 50: first base sheet, 60: adhesive layer, 70: second base sheet, 80: IC Chip, 90: antenna body, 100: third receiving layer

Claims (13)

A thermal transfer image receptor comprising a substrate and a receiving layer on the substrate,
The receiving layer is a layer formed from at least a resin having an aromatic hydrocarbon group, an aliphatic hydrocarbon group and a hydroxyl group and a curing agent,
A thermal transfer image receptor, wherein the resin has a structural unit derived from at least one compound selected from lauryl acrylate, stearyl methacrylate and lauryl methacrylate. The resin having an aromatic hydrocarbon group, an aliphatic hydrocarbon group and a hydroxyl group comprises a unit (a) having an aromatic hydrocarbon group, a unit (b) having an aliphatic hydrocarbon group and a unit (c) having a hydroxyl group and wherein said unit (b) is a structural unit derived from at least one compound selected from lauryl acrylate, stearyl methacrylate and lauryl methacrylate. The proportion of the unit (a) having the aromatic hydrocarbon group is 35% by mass or more with respect to 100% by mass of all structural units constituting the resin having the aromatic hydrocarbon group, the aliphatic hydrocarbon group and the hydroxyl group, 80% by mass or less, the composition ratio of the unit (b) having an aliphatic hydrocarbon group is 10% by mass or more and 60% by mass or less, the composition ratio of the unit (c) having a hydroxyl group is 0.1% by mass or more, 3. The thermal transfer image receptor according to claim 2, wherein the content is 20% by mass or less. The thermal transfer image receptor according to any one of claims 1 to 3, wherein the receiving layer has a peak top temperature of 45°C or higher and 100°C or lower. The thermal transfer image receiving member according to any one of claims 1 to 4, wherein the resin having an aromatic hydrocarbon group, an aliphatic hydrocarbon group and a hydroxyl group has a weight average molecular weight of 50,000 or more. In the receiving layer, the content ratio of the curing agent to the resin having an aromatic hydrocarbon group, an aliphatic hydrocarbon group and a hydroxyl group is 5/95 or more and 30/70 or less on a mass basis. The thermal transfer image receptor according to any one of claims 1-5. 4. The thermal transfer image receptor according to claim 2, wherein the unit (a) having an aromatic hydrocarbon group is a structural unit derived from a compound represented by the following general formula (1).

(Wherein, A represents an aromatic hydrocarbon group, and B represents hydrogen, an aromatic hydrocarbon group, or an aliphatic hydrocarbon group having 1 to 10 carbon atoms) 8. The thermal transfer image receptor according to any one of claims 2, 3 and 7, wherein the hydroxyl group-containing unit (c) is a structural unit derived from a hydroxyl group-containing (meth)acrylate. The thermal transfer image receiving member according to any one of claims 1 to 8, wherein the receiving layer is a layer formed from at least the resin, the curing agent, and an ultraviolet absorber having a hydroxyl group. The thermal transfer image receptor according to any one of claims 1 to 9, further comprising a second receiving layer between said substrate and said receiving layer. 11. The thermal transfer image receptor according to claim 10, wherein said second receiving layer is a layer formed from at least a butyral resin and a curing agent. 12. The third receiving layer according to claim 10, further comprising a third receiving layer formed from at least a resin material, a curing agent, and an ultraviolet absorber having a hydroxyl group, between the substrate and the second receiving layer. thermal transfer receiver. The thermal transfer image receptor according to any one of claims 1 to 12, wherein the substrate is a card substrate having an information recording function.

Images