JPH0615967A - Thermal transfer image receiving sheet - Google Patents

Abstract

PURPOSE:To provide an image receiving sheet high in the dyeing properties with a sublimable dye and good in blocking resistance. CONSTITUTION:A thermal transfer image receiving sheet has an image receiving layer based on an oil modified alkyd resin or a modified alkyd resin and containing at least one of a metal salt and an isocyanate compd. as an auxiliary component. If necessary, a highly smooth intermidiate layer based on a radiation curable resin is provided on a support. Therefore, by allowing a polar group such as an ester group, a hydroxyl group or a carboxyl group to be present, the dyeing properties with a sublimable dye are high and the diffusibility of the dye becomes well by modifying oil and a modifier and, as a result, high transfer density is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive transfer image-receiving sheet which is used in combination with an ink donor sheet in a sublimation-type heat-sensitive transfer method used as a means for color hard copy, and which has high image quality and high density. Moreover, the present invention relates to a heat-sensitive transfer image-receiving sheet excellent in blocking resistance.

[0002]

2. Description of the Related Art Conventionally, as a method for obtaining an image in accordance with image information, an impact ribbon method and an ink jet method have been proposed in addition to a heat-sensitive coloring method and a fusion-type heat-sensitive transfer method. There was a problem with it, and it was not possible to compare it with silver halide photography.

As a method for solving the drawbacks of these methods, a sublimation type thermal transfer method has been proposed. The sublimation thermal transfer method converts image information into an electric signal, and further converts the electric signal into a heat signal by a thermal head or a laser to heat the ink donor sheet, thereby sublimating or vaporizing the ink into an ink donor sheet. The image is transferred to and fixed on a heat-sensitive transfer image-receiving sheet that is in close contact with, and a continuous tone image is formed.

The image-receiving sheet used in the sublimation-type thermal transfer method generally has a structure in which an image-receiving layer containing a dye-dyeable resin as a main component is provided on a support. As the dyeable resin, saturated polyester, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, polyurethane, polycarbonate and the like have been conventionally known. However, when these resins are used, a sufficient transfer density is obtained. Requires a large amount of applied energy, and in terms of durability of the printer head,
Although it was desirable to use a dyeable resin that can obtain a sufficient transfer density even with low applied energy, a resin having a high transfer density is generally blocked (heat fusion) with a donor sheet during printing. Or due to the storability of the image after printing, especially due to the diffusion of the dye in the dyeing resin,
There is a problem that bleeding is remarkable. Specifically, JP-A-58-209596 discloses a thermal recording sheet containing an aminoalkyd resin in a coating layer.
In the publication, there is an example in which it is possible to obtain a thermal recording sheet which does not cause thermal fusion with the base sheet for thermal transfer even by extremely high thermal energy during high-speed thermal transfer. However, the mere inclusion of the aminoalkyd resin in the coating layer is still insufficient to solve the above-mentioned problems.

[0005]

Therefore, an object of the present invention is to provide blocking resistance even when an image-receiving layer is provided on a highly smooth support to obtain a sufficient transfer density and to obtain high image quality. And an image-receiving sheet for heat-sensitive transfer excellent in

[0006]

As a result of intensive studies, the present inventors have found that an image-receiving layer provided on at least one surface of a support contains an oil-modified alkyd resin or a modified alkyd resin as a main component, and a metal salt or an isocyanate compound. It was found that by containing at least one selected from the above as an accessory component, an image-receiving sheet having a high transfer density and excellent in blocking resistance dye dyeing property can be obtained.

In the image-receiving sheet used in the present invention, an image-receiving layer is formed on a support by using at least one selected from a metal salt and an isocyanate compound together with an oil-modified alkyd resin or a modified alkyd resin as a subcomponent. It is a thing.

The oil-modified alkyd resin and modified alkyd resin used in the present invention have a molecular weight of 2000 to 3000.
It is a prepolymer to the extent that it is polymerized and cured by polymerizing and crosslinking molecules. Polymerization is
Other than esterification reaction of hydroxyl group and carboxyl group at the molecular end, cobalt, manganese, lead, zinc, calcium, naphthenic acid salts of metals such as zirconium, modified fatty acid portion having a double bond, tall fatty acid salt, or, Polymerization and cross-linking using a salt with other synthetic acid, and / or cross-linking of free hydroxyl group and carboxyl group with polyisocyanate compound can proceed.

The oil-modified alkyd resin and the modified alkyd resin used in the present invention are prepolymers having a structure in which a modified portion such as a long-chain fatty acid is branched from a poly (oligo) ester skeleton composed of a polyol and a polycarboxylic acid. A film is formed by polymerizing using the above-mentioned crosslinking method. When polymerizing the alkyd resin, the influence of the modified oil, the type of the modifier, the amount of the modified oil (oil length) is large, and the oil length is small, or the carbon that can react with the metal salt in the modified oil When the number of carbon double bonds is small, the polymerization of the resin does not proceed sufficiently and the surface tends to become sticky or blocking is likely to occur. However, addition of a polyisocyanate compound to crosslink these problems. It is not necessary to add a polyisocyanate compound when sufficient curability is exhibited simply by adding a metal salt to the resin, but even in this case, in order to obtain a high-quality image with good dot reproducibility. A polyisocyanate compound may be used in combination for the purpose of improving the blocking resistance even under conditions where blocking is likely to occur, such as coating an image receiving layer on a highly smooth support.

The addition amount of the metal salt and the polyisocyanate compound to the alkyd resin differs depending on the type of the alkyd resin and whether the auxiliary components to be added are used alone or as a mixed system of both. However, generally, the addition amount of the metal salt is 0.01 to 100 parts with respect to 100 parts of the alkyd resin.
The amount of the polyisocyanate compound added to the alkyd resin is 1 to 9 parts with respect to 100 parts of the alkyd resin.
5 parts is preferable, and particularly preferably 3 to 90 parts.
If the addition amount is less than the above amount, curing is insufficient and there is a problem in blocking resistance, and if it is more than the above amount, the transfer density is lowered.

The alkyd resin basically comprises a polyol, a polycarboxylic acid, a modified oil and a modifier. An alkyd resin composed of a polyol, a polycarboxylic acid, and a modified oil forming the main chain is called an oil-modified alkyd resin, and an alkyd resin composed of a polyol, a polycarboxylic acid, and a modifier forming the main chain is called a modified alkyd resin. The modified alkyd resin includes a modified oil modified with a modifier.

As the polyol forming the alkyd resin, ethylene glycol, neopentyl glycol, glycerin, trimethylolpropane, trimethylolethane, pentaerythritol, 1,4-cyclohexanedimethanol, 2,2,4-trimethyl-1, 3-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, hydroxypivalyl hydroxypivalate, 3-methyl-1,5-pentanediol, 2-methyl-1,8-octanediol, 1 , 9-nonanediol, 2-methyl-1,3-propanediol and the like.

As the polycarboxylic acid, phthalic anhydride,
Isophthalic acid, terephthalic acid, adipic acid, trimellitic anhydride, 1,2-cyclohexanedicarboxylic acid, 1,
There are 3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, hexahydrophthalic anhydride, 5-sodiosulfoisophthalic acid and the like.

The modified oil is generally a mixture of a plurality of long chain aliphatic compounds, such as castor oil, coconut oil, linseed oil, palm kernel oil, safflower oil, soybean oil, tung oil, tall oil, dehydrated castor oil. , Rice sugar oil, etc.

Examples of the modifier include natural resins such as rosin, phenolic resins, epoxy resins, silicone intermediates and resins,
Urethane resin, vinyl monomer, etc. are available.

The oil-modified alkyd resin and modified alkyd resin used in the present invention are, for example, Beckosol 132.
3-60-EL, Beckozol OD-E-230-7
0, Beckol OD-E-240-70, Beckol 1308, Beckol ER-3400-60, Beckol ER-3600-60, Beckol ER-3.
653-60, Beckol ER-4005-60, Beckol 50-594-80, Beckol EZ-3
509-60, Beckozol EZ-3531-80, Beckozol ET-3300-60X, Beckozol ET
-3604-60, Beckozole 1307-60-E
L, Beckozole 1343, Beckozole EZ-302
0-60, Beckol ET-3061-P, Beckol EY-4006-60, Beckol J-524-
IM-60, Beckozole EZ-3530-80, Beckozole EY-3002-65, Beckozole 57-1
362, Beckol CB-931, Beckol OD
-E-198-50, Beckozole 45-463, Beckozole ES-4020-55, Beckozole EL-4
501-50, ES-5003-50, Beckozole E
S-5004-50, Beckozol J-557, Beckozol 15-146, Beckozol, Beckozol 17
-999, Beckosol 1334-EL, Beckosol EL-5007 Beckosol ES-5103-50X,
Super Beckosol ES-4012, Beckosol P
-470-70, Beckozole ES-6012-60,
Beckozole ES-6505-70, Beckozole ES
-6015-60, Beckozol ET-6502-6
0, Beckosol EL-6501-70, Beckosol J-510, Beckosol No. 1 solution, beccosol 1341, beccosol P-271, beccozole J-611, beccozole J-608, beccozole P-539, beccozole M-2151, beccozole M-2155, beccozol TD-50-30, styrezol 4250, styrezol 4400, stilezole. 4440, Styresol J-719, Styresol M-1159, Styresol M-1170, P-786.
-50, Beccosol M-9201, Watersol S-311, Watersol S-346, Watersol S-333, Watersol S-319-H
V, Watersol S-326, Watersol C
D-520, Watersol S-123, Watersol S-126, Watersol S-196, Watersol S-117, Watersol S-11
8, Watersol S-145, Watersol S
-346 (above, Dainippon Ink and Chemicals), Hariftar 915-60L, Hariftar 912-60, Hariftar 935-60, Hariftar LOG42-60.
X, Hariftar COG40-50T, Hariftar 7
32-60, Haliftal 1111-60HV, Haliftal SB-7123, Haliftal 698X, Haliftal SFG42-60X, Haliftal H-302.
T, Hariftar SB-7540, Hariftar SB-
7150, Hariftar TFP30-50HV, Hariftar 223, Hariftar 3271, Hariftar 3
371, Hariftar 309LV, Hariftar 309
-60, Hariftar 3011, Hariftar 300
4, Hariftar SC-3128TX, Hariftar 3
190-45, Hariftar 3100, Hariftar S
C-3211, Hariftar 3150, Hariftar X
-1000, Haliftar SC3059TX, Haliftar 3261, Haliftar MS-4234, Haliftar 816, Haliftar KL-912, Haliftal SL-1230, Haliftar SL-3500, Haliftal 764-60, Haliftar BOP 208-70.
S, Hariftar 240G, Hariftar SL-88
9, Hariftar 655, Hariftar 678, Hariftar 601, Hariftar 1155, Hariftar K
V-905, Hariftar 6101, Hariftar 19
3HV, Hariftar 3011PN, Hariftar 32
54PN, Hariftar 3256P, Hariftar 60
00, Hardip AD-103, Hardip BK-
77, Halli Dip H-541, Hari Dip L-116
AM (above, Harima Kasei), Phtalkid 133-6
0, Phtalkid 133-60S, Phtalkid M13
2-60, Phtalkid X450, Phtalkid 444
-50, Phtalkid 444-50T, Phtalkid 8
03-70, phthalkid 804-70A, phthalkid 806-65, phthalkid 926-70, phthalkid 926-80A, phthalkid 930-70D, phthalkid 970-80, phthalkid 970-80
X, Phtalkid 937-60T, Phtalkid 235
-50, phthalkid 235-60LV, phthalkid 237-60A, phthalkid 213-60, phthalkid 220-50, phthalkid 640-50, phthalkid 640-60, phthalkid X483, phthalkid X468, phthalkid X542, phthalkid D
653G, Phtalkid D641E-5, Phtalkid D680, Phtalkid DX615, Phtalkid D6
34S, Phtalkid D686, Phtalkid P55
2, Phthalkid X414, Phthalkid P563, Phthalkid P571, Phthalkid D682, Phthalkid D683, Phthalkid V901, Phthalkid V
903, Phtalkid V916D, Phtalkid V91
7, Phtalkid V932, Phtalkid V904, Phtalkid EX105D, Phtalkid EX101-1
0, Phtalkid EX110 (above, Hitachi Chemical).

In the present invention, examples of the metal salt include cobalt, manganese, calcium, zirconium,
Lead, zinc, copper naphthenates, tall fatty acid salts,
Various synthetic acid salts can be used.

As the polyisocyanate compound that can be used in the present invention, any compound generally used in the industrial field can be preferably used, and specific examples thereof are 2,4.
-Tolylene diisocyanate, 2,6-tolylene diisocyanate, diphenylmethane-4,4'-diisocyanate, polymethylene polyphenyl polyisocyanate, 1,6-hexamethylene diisocyanate, 1,5
-In addition to naphthylene diisocyanate, isophorone diisocyanate, xylene diisocyanate, lysine diisocyanate, triisocyanate and the like, various isocyanate derivatives can be used. Specifically, Takenate E-4
0, Takenate D110N, Takenate D103H (Takeda Pharmaceutical Co., Ltd.), Sumidule L, Sumidule IL, Desmodur N3200, Desmodur E3260
(Sumitomo Bayer Urethane), Coronate T, Millionate MT, Millionate MR, Coronate L, Coronate HX, Coronate HL, Coronate N, Coronate HK
(Japan Polyurethane Industry) and the like.

In the present invention, in order to obtain a high quality image having further excellent dot reproducibility, a highly smooth intermediate layer containing a radiation curable resin as a main component is provided between the support and the image receiving layer. It is preferable. As a method for providing a highly smooth intermediate layer on the support, for example, the intermediate layer resin composition, blade coat, air doctor coat, squeeze coat, air knife coat, reverse roll coat, gravure roll and transfer roll coat, bar coat, A method of applying by curtain coating or the like is used. Also, if necessary, a radiation-curable resin composition is applied onto a support, or after application, a high-smoothness film or the like is laminated and irradiated with radiation from the film side or the support side to be cured, and then the film is peeled off. Therefore, an image receiving layer may be provided. In addition, the radiation-curable resin composition is applied between the support and the metal roll having high smoothness, etc., at the time of contact, or after contact, the support is irradiated with radiation to cure and then peeled, and then the image is received. Layers may be provided. By providing the image receiving layer on the high smooth surface, a high quality image without missing dots can be obtained. The center line average roughness (Ra) of the intermediate layer is preferably 0.5 μ or less, particularly preferably 0.2 μ or less.

The radiation-curable resin used in the intermediate layer of the present invention is a compound having a reactive group such as an acryloyl group, a methacryloyl group, or an epoxy group at the molecular end or in the molecular side chain, and is an unsaturated polyester or modified polyester. A saturated polyester, an acrylic polymer, an acrylic monomer, a methacrylic polymer, a methacrylic monomer, a monomer or oligomer having a vinyl type unsaturated bond, an epoxy compound or the like can be used alone or together with other solvents. The following is a typical example.

(A) Polyester acrylate, polyester methacrylate For example, Aronix M-5300, Aronix M-
5400, Aronix M-5500, Aronix M
-5600, Aronix M-5700, Aronix M-6100, Aronix M-6200, Aronix M-6300, Aronix M-6500, Aronix M-7100, Aronix M-8030, Aronix M-8060, Aronix M-8100 (above, Toagosei Chemical Industry Co., Ltd. product name), Viscoat 70
0, Viscoat 3700 (above, trade name of Osaka Organic Chemical Industry Co., Ltd.), Kayarad HX-220, Kayarad HX-620 (above, trade name of Nippon Kayaku Co., Ltd.)

(B) Epoxy acrylate, epoxy methacrylate For example, NK ester, EA-800, NK ester,
EPM-800 (above, Shin-Nakamura Chemical Co., Ltd. trade name), Viscoat 600, Viscoat 540 (above Osaka Organic Chemical Industry Co., Ltd. trade name), Photomer 3016, Phutomer 3082 (above San Nopco Ltd. trade name)

(C) Urethane acrylate, urethane methacrylate For example, Aronix M-1100, Aronix M-
1200, Aronix M-1210, Aronix M
-1250, Aronix M-1260, Aronix M-1300, Aronix M-1310 (above, product name of Toagosei Chemical Industry Co., Ltd.), Viscoat 812, Viscoat 823, Viscoat 823 (above, product of Osaka Organic Chemical Industry Co., Ltd.) Name), NK ester, U-108-A,
NK Ester, U-4HA (above, Shin Nakamura Chemical Co., Ltd. trade name)

(D) Monofunctional acrylate, monofunctional methacrylate For example, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate,
2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, tetrahydrofurfuryl acrylate, phenoxyethyl acrylate, cyclohexyl acrylate,
Cyclohexyl methacrylate, benzyl acrylate, glycidyl methacrylate, N, N-dimethylaminoethyl acrylate, N, N-dimethylaminoethyl methacrylate, N, N-diethylaminoethyl methacrylate, butoxyethyl acrylate and the like. Ethylene oxide-modified phenoxyphosphoric acid acrylate Ethylene oxide-modified butoxylated phosphoric acid acrylate, other product names of Toagosei Kagaku Kogyo Co., Ltd. are Aronix M-101, Aronix M-102, Aronix M.
-111, Aronix M-113, Aronix M-
114, Aronix M-117, Aronix M-1
52, Aronix M-154 and the like.

(E) Polyfunctional acrylate, polyfunctional methacrylate For example, 1,6-hexanediol diacrylate,
1,6-hexanediol dimethacrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, polypropylene glycol diacrylate, polypropylene glycol dimethacrylate, pentaerythritol diacrylate, dipentaerythritol hexaacrylate, Isocyanuric acid diacrylate, pentaerythritol triacrylate, isocyanuric acid triacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, ethylene oxide modified pentaerythritol tetraacrylate, propylene oxide modified pentaerythritol tetraacrylate, propylene Oxide modified dipentaerythritol polyacrylate, such ethylene oxide-modified dipentaerythritol polyacrylate. The product name of Toagosei Kagaku Kogyo Co., Ltd. is Aronix M-
210, Aronix M-215, Aronix M-2
20, Aronix M-230, Aronix M-23
3, Aronix M-240, Aronix M-24
5, Aronix M-305, Aronix M-30
9, Aronix M-310, Aronix M-31
5, Aronix M-320, Aronix M-32
5, Aronix M-330, Aronix M-40
0, TO-458, TO-747, TO-755, TH
IC. TA2 etc. are mentioned.

(F) Epoxy compound Examples include glycidyl methacrylate, 1,3-bis (N, N-diepoxypropylaminomethyl) cyclohexane, and 1,3-bis (N, N-diepoxypropylaminomethyl) benzene. The product names of Mitsubishi Gas Chemical Co., Ltd. are GE-510, TETRAD-X, TETRAD-
C etc. are mentioned.

As the photoinitiator used in the present invention, acetophenones such as di- or trichloroacetophenone, benzophenone, Michler's ketone, benzyl, benzoin, benzoin alkyl ether, benzyl dimethyl ketal, tetramethyl thiuram monosulfide,
There are thioxanthones, azo compounds and the like, and they are selected from the viewpoints of the type of polymerization reaction of the radical-polymerizable resin and the radical-polymerizable silicone resin, stability, and compatibility with a radical irradiation device. The amount of the photoinitiator used is usually in the range of 1 to 5% with respect to the radical polymerizable resin or the radical polymerizable silicone resin. Further, a storage stabilizer such as hydroquinone may be used in combination with the photoinitiator.

The amount of the radiation-curable resin composition coated on the support varies depending on the type of the support, but is about 2 to 50 g /
m2, more preferably 5 to 30 g / m2. The ionizing radiation for curing the radically polymerizable composition generally includes ultraviolet rays, α rays, β rays, γ rays, X rays, electron rays and the like, but α rays, β rays, γ rays or X rays are Since it is accompanied by the problem of danger to the human body, ultraviolet rays and electron beams, which are easy to handle and are widely used industrially, are effective.

When using an electron beam, the amount of the electron beam to be irradiated is preferably adjusted within the range of 0.1 to 10 Mrad. When it is 0.1 Mrad or less, a sufficient irradiation effect cannot be obtained, and when it is 10 Mrad or more, the paper or film substrate is deteriorated, which is not preferable. As the electron beam irradiation method, a scanning method, a curtain beam method, or the like is adopted, and the acceleration voltage for irradiating the electron beam is 100 to 300K.
V is suitable. Also, when using ultraviolet light,
It is necessary to add a sensitizer to the radiation-curable resin composition, and the sensitizer described above can be appropriately used. As the light source, for example, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, a xenon lamp, a tungsten lamp, etc. are preferably used.

In the present invention, a releasing agent may be used in order to enhance the releasing property between the ink donor sheet and the image receiving layer during printing. Examples of the release agent include higher fatty acids or esters thereof, amides or metal salts thereof, waxes such as shellac wax, montan wax, carnauba wax, polyethylene wax and Teflon powder; fluorine-based and phosphoric ester-based surfactants; Silicone oil and the like can be mentioned. As the silicone oil, modified silicone oils such as amino-modified silicone, epoxy-modified silicone, alkyd-modified silicone and the like can be used.
Further, as the silicon compound, a hardening type silicon compound can be used if necessary. Examples of the curable silicon compound include a reaction curable type, an ionizing radiation curable type, and a catalyst curable type.

In the image receiving layer and / or the release layer provided on the image receiving layer in the present invention, various additives such as an ultraviolet absorber, an antioxidant, an antistatic agent, a dispersant, a stabilizer and a pigment are added. It can be added in an appropriate combination.

In the present invention, the surface of the support may be subjected to surface treatment such as corona treatment or subcoating in order to improve the adhesion and wettability between the support or the intermediate layer and the image receiving layer.

On the back surface of the heat-sensitive transfer image-receiving sheet of the present invention,
To form a resin coating layer by applying a polyolefin resin by melt extrusion method or by applying a radiation-curable resin and then forming a film by irradiation with radiation, curl prevention, antistatic, writing property A coat layer can be provided. Antistatic agent, natural or synthetic resin binder, latex, hardener, backcoat layer,
A pigment, a surfactant and the like can be appropriately combined and contained.

The support used in the present invention includes ordinary natural pulp paper, coated paper, laminated paper, glass paper, synthetic fiber, synthetic resin film or so-called synthetic paper obtained by simulating synthetic resin film,
Nonwoven fabric or the like can be used. The thickness of the support is not particularly limited, but a smooth one is preferable, and its basis weight is preferably 30 to 300 g / m ² .

A precoat layer may be provided between the support of the present invention and the image receiving layer for the purpose of averaging unevenness of the support and improving whiteness and opacity. Inorganic coating layers such as clay, talc, kaolin, and ansilex, polyethylene (high-density polyethylene, low-density polyethylene, medium-density polyethylene, linear low-density polyethylene), polypropylene, polybutene, etc. , An organic material such as a homopolymer of a thermoplastic resin such as polypentene or polyethylene terephthalate or a copolymer composed of two or more kinds of olefins such as an ethylene / propylene copolymer can be used,
These resins can be used alone or as a mixture. White pigments for improving whiteness and opacity may be contained in these resins. Hollow particles may be contained for the purpose of improving the adhesion to the ink donor sheet and the heat insulation of the image receiving layer.

The thickness of the image-receiving layer varies depending on the type and smoothness of the base paper, but is 1 to 50 μm, more preferably 2 to 30 μm.
If it is less than this thickness, sufficient results cannot be obtained from the viewpoint of sublimability dye acceptability, whiteness and opacity, and it is difficult to apply uniformly. If it is more than this thickness, a smooth and even coating layer is formed. It is difficult to provide and is not preferable in terms of quality.

[0037]

The image-receiving layer contains an oil-modified alkyd resin or a modified alkyd resin as a main component and at least one selected from a metal salt and an isocyanate compound as a sub-component, so that the transfer density and blocking resistance are excellent. The image receiving sheet was obtained. The reason for this is not clear, but it is thought to be as follows.

That is, since the image-receiving layer formed according to the present invention contains free hydroxyl groups and carboxyl groups in addition to ester bonds and urethane bonds, it has a high affinity for sublimable dyes and a modified oil, By forming moderate voids in the resin cured product by the modifier, as a result of promoting diffusion of the sublimable dye, a high transfer density can be obtained, while it is cross-linked with a metal salt or an isocyanate compound, which results in blocking resistance. It is thought that the property will improve.

[0039]

The present invention will be described in detail below with reference to examples, but the contents of the present invention are not limited to the examples. Parts in the examples are parts by weight unless otherwise specified.

The ink donor sheets used in the following examples were back-coated with a silicone resin,
A PET film having a thickness of 10 μm and applied with an ink layer coating solution having the following composition to a thickness of 2 μm was used. Ink layer coating liquid formulation Cyan disperse dye (Kayaset Blue 714, Nippon Kayaku) 5 parts Ethyl cellulose 8 parts Polyethylene wax 2 parts Toluene 50 parts Methyl ethyl ketone 50 parts The ink donor sheet obtained as described above was used for the printing test. And an image receiving sheet prepared by the method of the following example are superposed so that the ink layer and the image receiving layer face each other, and a thermal head is used from the ink donor sheet side to obtain a recording density of 8 dots / mm and an output of 0.50 W / dot. I went under the conditions.

Example 1 A mixture having the following composition was thoroughly mixed and dispersed to prepare a coating liquid A for image receiving layer.
A liquid was prepared. Liquid A Alkyd resin, SL-3500 (linseed oil, Harima Kasei) 100 parts Cobalt naphthenate 1 part Alcohol-modified silicone 0.5 parts Toluene 400 parts Solution A is applied to polyethylene RC paper with a thickness of 200 μm using a wire bar. Then, it was heated and dried at 100 ° C. for 10 minutes to form an image receiving layer having a thickness of 5 μm to obtain a heat-sensitive transfer image receiving sheet.

Example 2 A mixture having the following composition was thoroughly mixed and dispersed to prepare a coating liquid B for image receiving layer.
A liquid was prepared. Liquid B Alkyd resin, 1323-60-EL (coconut oil, Dainippon Ink and Chemicals) 100 parts Tolylene diisocyanate 60 parts Epoxy modified silicone 0.4 parts Amino modified silicone 0.4 parts Toluene 250 parts Methyl ethyl ketone 150 parts Wire B liquid Using a bar, it was applied on polypropylene synthetic paper having a thickness of 150 μm and dried by heating at 100 ° C. for 10 minutes to form an image receiving layer having a thickness of 5 μm to obtain a heat-sensitive transfer image receiving sheet.

Example 3 A mixture having the following composition was thoroughly mixed and dispersed to prepare an image-receiving layer coating liquid C.
Solution, Release Layer Coating Solution D Solution was prepared. Solution C Alkyd resin: DX615 (soybean oil, Hitachi Chemical) 100 parts Lead naphthenate 2 parts Diphenylmethane-4,4'-diisocyanate 5 parts Toluene 400 parts Solution D amino modified silicone 2 parts Epoxy modified silicone 2 parts Ethanol 100 parts Solution C Is coated on a coated paper having a thickness of 200 μm by using a wire bar, and dried by heating at 100 ° C. for 10 minutes to form an image receiving layer having a thickness of 4 μm, and then D liquid is applied on the image receiving layer, Heat dried at 100 ℃ for 10 minutes, thickness 0.5
A release layer having a thickness of μm was formed to obtain a heat-sensitive transfer image-receiving sheet.

Example 4 A mixture having the following composition was thoroughly mixed and dispersed, and an image receiving layer coating liquid E was obtained.
A liquid was prepared. Liquid E Alkyd resin, 3254PN (phenol-modified, Harima Kasei) 100 parts Lead naphthenate 2 parts Tolylene diisocyanate 15 parts Epoxy-modified silicone 0.4 parts Amino-modified silicone 0.4 parts Toluene 400 parts Cast-coated paper with a thickness of 180 μm On the support, trimethylolpropane triacrylate was cured with an irradiation dose of 200 Mrad using an electron beam while contacting with a biaxially stretched polyethylene terephthalate film to give a thickness of 2
Solution E was applied to a 0 μm intermediate layer sheet using a wire bar and heated at 100 ° C. for 10 minutes to form an image receiving layer having a thickness of 5 μm, to obtain a heat-sensitive transfer image receiving sheet.

Example 5 A mixture having the following composition was thoroughly mixed and dispersed, and an image receiving layer coating liquid F was obtained.
A liquid was prepared. Liquid F Alkyd resin, 4250 (vinyl modified, Dainippon Ink and Chemicals) 100 parts Tolylene diisocyanate 15 parts Epoxy modified silicone 0.4 parts Amino modified silicone 0.4 parts Toluene 400 parts F liquid is applied in the same manner as in Example 4. Then, a heat-sensitive transfer image-receiving sheet was obtained.

Comparative Example 1 A mixture having the following composition was thoroughly mixed and dispersed, and an image receiving layer coating liquid G was obtained.
A liquid was prepared. Liquid G Linear saturated polyester (Vylon 200, Toyobo) 100 parts Epoxy-modified silicone 0.4 parts Amino-modified silicone 0.4 parts Toluene 250 parts Methyl ethyl ketone 150 parts G liquid using a wire bar, polyethylene RC with a thickness of 180 μm It was applied on paper and heated and dried at 100 ° C. for 10 minutes to form an image receiving layer having a thickness of 5 μm to obtain a heat-sensitive transfer image receiving sheet.

Comparative Example 2 A thermal transfer image-receiving sheet was obtained in the same manner as in Example 5, except that tolylene diisocyanate was not used.

Comparative Example 3 A heat-sensitive transfer image-receiving sheet was obtained in the same manner as in Example 2 except that the addition amount of tolylene diisocyanate was 100 parts.

Regarding the printing results of the above image receiving sheet, the Macbeth reflection density and the blocking at the time of printing were visually observed and
The results evaluated in stages are shown.

[0050]

[Table 1] In terms of blocking resistance, ◯: no blocking was observed at all, Δ: slight blocking was observed, and x: considerable blocking was observed.

Evaluation results: Compared with Comparative Example 1 using the linear saturated polyester, Examples 1 to 5 having the image receiving layer using the alkyd resin have a clearly higher transfer density. This means that the alkyd resin is
This shows that it has high dyeability. Further, as seen in Comparative Example 2, when it is not cured with a metal salt or an isocyanate compound, the blocking resistance is poor, and as seen in Comparative Example 3, if the addition amount of the metal salt or an isocyanate compound is too large, The transfer density decreases.

[0052]

As is clear from the results shown in Table 1, the oil-modified alkyd resin or the image-receiving layer containing the modified alkyd resin as a main component is provided on the support, whereby the dyeability of sublimation dyes and blocking resistance are improved. It was possible to obtain an excellent heat-sensitive transfer image-receiving sheet.

Claims (2)

[Claims] 1. A heat-sensitive transfer image-receiving sheet for forming an image on an image-receiving sheet by subliming or vaporizing a dye by heating, wherein an image-receiving layer provided on at least one surface of a support comprises an oil-modified alkyd resin or a modified alkyd. A heat-sensitive transfer image-receiving sheet comprising a resin as a main component and at least one selected from a metal salt and an isocyanate compound as an auxiliary component. 2. An intermediate layer containing a radiation-curable resin as a main component is provided on a support, and the intermediate layer is selected from ultraviolet rays and electron beams during or after contact between the support and the highly smooth surface. The heat-sensitive transfer image-receiving sheet according to claim 1, which is formed by curing with at least one radiation.