JPH02214693A - Thermal transfer recording medium - Google Patents

Abstract

PURPOSE:To enhance the transfer rate and resolving power of an image by providing a release layer based an wax on a support and further providing an ink layer based on a colorant and a specific copolymer component thereon and furthermore laminating a fixability enhancing layer based on a resin having a specific glass transition point. CONSTITUTION:A release layer 2 based on wax having an m.p. of 50 -90 deg.C is provided on a support 1 and an ink layer 3 based on a colorant and a copolymer of ethylene and ethyl acrylate or vinyl acetate (ethylene content ; 70-90wt.%) having a melt index of 50-4000g/10min and a styrene/isoplene/styrene and/or styrene/butadiene/styrene type block copolymer is provided thereon and, further, a fixability enhancing layer based on at least one kind of a resin having a glass transition point of 100 deg.C or more selected from styrenic and/or styrene derivative type, vinyl type and acrylic resins is further laminated. By this method, thermal transfer properties at the times of high density printing and high speed printing is enhanced and a printing image of high resolving power can be obtained even to a paper low in smoothness.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has excellent thermal transfer properties especially during high-density printing and high-speed printing, and can print high-resolution images not only on paper with high smoothness but also on paper with low smoothness. The present invention relates to a thermal transfer recording medium.

[Prior Art J] In the conventional thermal transfer recording method, the transfer recording performance, that is, the printing quality, is greatly affected by the surface smoothness of the recording medium. Good printing is performed on highly smooth recording media, but In the case of a low-quality recording medium, the print quality deteriorates significantly. However, even when using paper, which is the most typical recording medium, highly smooth paper is rather special, and ordinary paper has various degrees of unevenness due to entangled fibers. Therefore, in the case of paper with large surface irregularities, the hot-melted ink cannot penetrate into the paper fibers during printing and adheres only to the convex parts of the surface or evenly around them, resulting in the edges of the printed image being distorted. The image may not be sharp or part of the image may be missing, reducing print quality.

Additionally, in order to improve printing quality, it is possible to use a heat-melting binder with a low melting point, but in this case, the heat-transferable ink layer becomes sticky even at relatively low temperatures, resulting in poor storage stability. This causes inconveniences such as deterioration and staining of non-printing areas of the recording medium.

There is also an example in which a rubber elastic substance is added to the ink layer in an amount of 0.63 to 10% by weight to improve transferability to rough paper. but,
In these methods, it was difficult to achieve the intended purpose because the rubber elastic material had a decrease in thermal sensitivity or the ink was not clean enough (Japanese Patent Application Laid-Open No. 62-230872.62-30083).
6O-225795).

In addition, there is a so-called bridge transfer method which is already known as a method for printing on rough paper. This is the same layer structure as in the present invention, but because the ink layer was transferred by contacting only the convex and convex portions of the receiving paper, the image fixing properties were poor and the transfer was defective in four large areas.

The above-mentioned conventional thermal transfer recording medium provided with a heat-fusible coloring material layer requires energy to melt and transfer the heat-fusible coloring material layer, especially when transferring in a short heating time such as during high-density printing or high-speed printing. There was a drawback that the image transfer rate and resolution were insufficient due to the lack of.

[Problems to be Solved by the Invention] The purpose of the present invention is to provide a high-resolution printed image not only on paper with high smoothness but also on paper with low smoothness, with excellent thermal transfer properties during high-density printing and high-speed printing. An object of the present invention is to provide a thermal transfer recording medium.

[Means for Solving the Problems] The thermal transfer recording medium of the present invention has a melting point of 50 to 10
A release layer mainly composed of wax at 0°C, preferably 60 to 90°C is provided, and a colorant and a melt index of 50 to 4000 g/1Osin, preferably 800 to 800 are provided thereon.
2500g710iin of copolymer of ethylene and ethyl acrylate or vinyl acetate (ethylene content 70iin)
90% by weight) and a styrene-isobrene-styrene type and/or styrene-butadiene-styrene type block copolymer as a main component. It is characterized by sequentially laminating fixing improving layers containing at least one type of styrene-derived resin, vinyl resin, or acrylic resin as a main component.

Further) In order to improve the adhesion of the release layer, an oxidized polyethylene wax with a melting point of 100°C or higher and a melt index of lO~800g/login is placed between the support and the thermal transfer layer.
The invention is characterized in that it is provided with an adhesion-improving layer whose main component is a copolymer of ethylene and ethyl acrylate or vinyl acetate (ethylene content: 70 to 90% by weight).

Further, the present invention is characterized in that any one layer on the support is composed of fine particles.

The layer structure of the thermal transfer recording medium of the present invention will be schematically explained as shown in FIGS. 1 and 2.

In the figure, 1 is a support, 2 is a release layer, 3 is an ink layer, 4 is a fixability improving layer, and 5 is an adhesive layer.

The oxidized polyethylene wax used in the adhesive layer of the present invention is preferably a flexible material with a melting point of 100°C or higher, preferably 110 to 130°C, and moreover ethylene and ethyl acrylate or vinyl acetate with a melt index of lO to ftoOg/login. By using a copolymer with (ethyl acrylate or vinyl acetate content 10-30%), the adhesion to the support is improved. Also, by combining oxidized polyethylene wax and a copolymer of ethylene and ethyl acrylate or vinyl acetate, not only the adhesion to the support is improved, but also the melt index of oxidized polyethylene wax and melt index 10 to 800g710sin is improved.
Due to the synergistic effect of the copolymer of ethylene and ethyl acrylate or vinyl acetate, the release layer on the adhesive layer is easily broken by the thermal energy of the thermal head, resulting in excellent transferability.

The mixing ratio of oxidized polyethylene wax and copolymer of ethylene and ethyl acrylate or vinyl acetate is [1
The ratio is preferably 90/lO to H/70. The thickness of the adhesive layer is 0.05 to 3.0 μm, preferably 0.5 to 1.5 μm.
is good.

The melt index used in the adhesive layer of the present invention is lo
~800g/10+*I+s, ethylene content is 70~
As 90% ethylene-vinyl acetate copolymer,
EVAFLEX manufactured by Mitsui DuPont Polychemical Company ■
210 (old -400g/10min, VA-28%)
, EVAFLHX-220 (old-150g710sin
, VA = 2 [1%), EVAPLBX-250 (M
I=15g/Login SV&-28%), EVAP
LEX-310 (old-400g/10min, VA-
25%), EVAFLEX-410 (M! = 4[1
0g/LOsin, VA-19%), EVAPLHX
-420 (MI=150g/1Oi1nS VA-19
%), EVAPLEX-450 (old-158/1Os
In, A-19%), EVAPLEX-550 (formerly-15g/1oin, VA-14%), and the like.

Also, the melt index is 1O ~ 600g/10mm
As an ethylene-ethyl acrylate copolymer having an ethylene content of 70 to 90%, EEA-704 (formerly -275 g/10 m
In, E^-25%), EEA-707 (old -25
g/10sin s EA=17%).

Also, as oxidized polyethylene WAX, p11oeehst-Wax PED 121 1 manufactured by Hoechst & Co.
13-11811oechst4ax PED 1
53 115-12011oechst-Wax
POD 521 103-10811oechs
Examples include t-Wax PED 522 100-105. The adhesive layer of the present invention mainly contains oxidized polyethylene wax and ethylene-ethyl acrylate or ethylene-vinyl acetate copolymer as described above, but in addition to these, if necessary, heat-melting substances such as carnauba, carnauba, etc. Paraffin, montan wax, etc. can be mixed.

The peeling layer of the present invention is provided to facilitate peeling of the coloring material layer and the support when the coloring material layer is melt-transferred, and includes:
It is preferable to use a substance that has a peak value of 120° C. or less in differential thermal analysis and is easily melted by heat to form a low-viscosity liquid. Such substances include natural waxes such as beeswax, spermaceti wax, candelilla wax, carnauba wax, rice bran wax, montan wax, and osikelite, petroleum waxes such as paraffin wax and microcrystalline wax, as well as various modified waxes, Examples include hydrogen-based waxes and long-chain fatty acids. The release layer of the present invention is mainly composed of a wax having a melting point of 5a to 90°C as described above, but if necessary, ethylene ethyl acrylate or ethylene-vinyl acetate copolymer can be mixed therein. .

When the release layer of the present invention has a fine particle structure, it is easy to break during printing, has excellent transferability, and has excellent one-dot reproducibility, so it is suitable for high-density printing and high-speed printing.

The fine particle structure of the present invention is formed by dispersing the wax described above in a solvent and coating it.

Examples of the solvent include toluene, xylene, ethyl acetate, methyl ethyl ketone, acetone, methanol, ethanol, isopropanol, ethyl cellosoneb, and cyclohexanone.

The size of the fine particles is 0. O1-0°8μ - preferably 0.05-0.4μ. (If it is too large, the thermal sensitivity will be lowered, and if it is too small, the one-dot reproducibility and transfer efficiency will be lowered.) The thickness of the peeling layer is 0.1 to 1θμ, preferably 1 to 5μ.

The ink layer of the present invention contains a colorant and a melt index of 50 to 50.
4000g/1011n, preferably 800-250
Copolymer of 0g710sin of ethylene and ethyl acrylate or vinyl acetate (ethylene content 70-9
0% by weight, preferably 70-85% by weight) and styrene-
The mixture of isobrene-styrene type and/or styrene-butadiene-styrene type block copolymers imparts specific elasticity to the thermoplastic ink layer. By doing so, it is possible to easily contact and adhere to the surface of the rough paper using the head pressure during printing. Furthermore, because the melt index is as high as 50 to 4000g/1Osin,
Since it melts and flows in a short time, it has the property of being easy to wet the transferred material, and since the copolymer has an ethyl acrylate or vinyl acetate content of 10 to 30%, it has suitable adhesion to paper. Further, the composition of the above two resins is used in a range of ethylene copolymer/niblock copolymer-8=2 to 2:8.

As a styrene-isobrene-styrene type and/or styrene-butanediene-styrene type block copolymer, the hardness share A (JIS [6301) is 30
~80 elastic body and melt index G condition (AS
1 to 5 in TM D123g) (8/10min)
It is 00.

If the hardness is less than this, abnormal images will occur in OHP printing, and if it is higher than this, the desired adhesion to rough paper irregularities cannot be achieved.

When the melt index is less than 1, the thermal sensitivity decreases,
Thermal transfer requires high energy. If it is greater than 500, it becomes difficult for the block copolymer to exhibit sufficient elasticity.

The melt index used in the ink layer of the present invention is 5
0~4000g/login, ethylene content 70~
As the ethylene-ethyl acrylate copolymer with a concentration of 90%, Ml3-910 (MI=
1100g/1Osin, EA=28%) M
B-900 (Ml-t500g/10min 5EA-
23%).

Melt index is 50-4000g/1Onin
As the ethylene-vinyl acetate copolymer having an ethylene content of 70 to 90%, MB-850 manufactured by Nippon Unicar Nakako Co., Ltd.
(MI=800g/1Oain, VA -22%)
,) IB-010 (old-1200g/10min,
VA-25%), MB-080 (old = 2500g
/login, VA -19%), etc.

EVA and EEA are as defined above. If the copolymerization amount is out of this range, the ink will be mixed with the block copolymer, resulting in a decrease in thermal sensitivity, making it impossible to cut and transfer the ink. If the melt index is less than 50, thermal sensitivity will be reduced and high energy will be required for thermal transfer, and if it is greater than 4000, a strong image cannot be formed on rough paper.

The ink layer of the present invention may also contain styrene and/or styrene derivatives, vinyl, acrylic, paraffin, polyethylene, campria, carnauba wax, etc., if necessary.

The mixing ratio of the block copolymer and the thermoplastic binder is appropriately selected depending on the printing conditions, but preferably the block copolymer accounts for 10 to 90% by weight, more preferably 30 to 60% by weight in the composition. .

The layer thickness is 0.2-5μ, preferably 0.5-4μ.

As the coloring agent, it is preferable to use organic or inorganic dyes or pigments that have properties suitable for recording materials. For example, it is preferable to have sufficient coloring density and not discolor or fade due to light, heat, humidity, etc. Further, it may be a substance that is colorless when not heated, but develops color when heated, or a substance that develops color when it comes into contact with a substance coated on a transfer target.

Specific examples include pigments and dyes such as carbon black, titanium dioxide, red iron oxide, Lake Red C1 Fast Sky Blue, benzidine yellow, phthalocyanine green, phthalocyanine blue, direct dyes, oil dyes, and basic dyes.

The ink layer of the present invention may be prepared by kneading a colorant and the above-described specific copolymer into a composition, and applying the composition to the surface of the release layer using an appropriate coating method.

As for the composition, the colorant and the above-mentioned specific copolymer are blended so that the weight of the colorant is 1 to 80%, preferably 5 to 30% of their total weight.

Further, the fine particle structure is formed by dispersing the composition in a solvent and coating it. Solvents include toluene, xylene, ethyl acetate, methyl ethyl ketone, acetone,
Examples include methanol, ethanol, isopropanol, ethyl cellosolve, and cyclohexanone.

The thickness of the ink layer provided as above is 0.1 μm.
-10μm is appropriate, preferably lμ-~5μm.
− is.

When the ink layer of the present invention has a fine particle structure, it is easily cut during printing, has excellent transferability, and has excellent one-dot reproducibility, so that it is suitable for high-density printing and high-speed printing.

The size of the fine particles is 0.01 to 0.8μ11
Preferably it is 0.05 to 0.4μ. If it is too large, thermal sensitivity will decrease, and if it is too small, one-dot reproducibility and transfer efficiency will decrease.

The fixing property improving layer of the present invention is mainly composed of at least one resin of styrene type and/or styrene conductor type, vinyl type, and acrylic type having a glass transition point of 100° C. or higher, and optionally paraffin wax, polyethylene wax, It is also possible to add waxes such as candelilla wax and carnauba wax, and thermoplastic substances such as thermoplastic resins such as PE, PVC, and EVASEEA.

The styrenic resin of the present invention has a molecular weight [MWl 85
．． 000 polystyrene (7g 100℃), polyP-carbomethoxystyrene (T
g 131”c), polyP-cyanostyrene (7g
120℃), poly O-methylstyrene (Tgl 15℃)
, poly P-methylstyrene (Tg 101'C),
Poly 2,4-dimethylstyrene (Tgl 19℃), poly 2,5-dimethylstyrene (7g 122℃), poly 3,4-dimethylstyrene (7g 102℃), polyP
-tart-butylstyrene (7g 118℃), polyP phenylstyrene (Tg 138℃), polyP-phenoxystyrene (7g 100℃), poly 2,5-difluorostyrene (Tg 101'C), polyP
-Chlorostyrene (Tg 12g°C), poly 2,5-dichlorostyrene (Tg 130°C), poly 3゜4-dichlorostyrene (Tg 13g°C), poly 2,6-dichlorostyrene (Tg 1167°C), poly α-vinylnaphthalene ( Tg 162°C), poly α-methylnaphthalene (Tg
180℃).

Polydivinylbenzene (7g10
6℃), polyvinyl formal (7g at 105℃), polyvinyl cyclohexane (7g at 100℃), and polymethyl methacrylate (7g at 105℃) as the acrylic resin.
), isotactic polymethyl methacrylate) (T
g 115°C), poly tert-butyl methacrylate (7g 107°C), polyethylene glycol dimethacrylate (Tg 11B”C), polypentachlorophenylacrylate (7g 145°C), polyphenyl methacrylate (Tg 110°C), polyP-cyanophenyl methacrylate (Tg 150°C), polyP-carbomethoxyphenyl methacrylate)' (Tg 1
06°C), poly P-cyanophenyl methacrylate (7
g128℃), polymethacrylonitrile (7g120℃)
).

The fixability improving layer of the present invention is obtained by dispersing the composition in a solvent,
When the ink layer is coated on the surface, it has a fine particle structure.

Examples of the solvent include toluene, xylene, ethyl acetate, methyl ethyl ketone, acetone, methanol, ethanol, isopropanol, ethyl cellosolve, and cyclohexanone.

The thickness of the fixing property improving layer provided as above is O=l
Approximately 1 μm to 10 μm, preferably 1 μm to 10 μm
The volume is 5 μl.

When the fixing property improving layer of the present invention has a fine particle structure, it is suitable for high density printing and high speed printing because it not only has good fixing properties but also has excellent transferability and excellent one-dot reproducibility during printing. There is.

The size of the fine particles is 0.01 to 0.8 μm,
Preferably it is 0.05 to 0.4 μm. If it is too large, thermal sensitivity will decrease, and if it is too small, one-dot reproducibility and transfer efficiency will decrease.

Examples of the support for the thermal transfer recording medium of the present invention include relatively heat-resistant plastic films such as polyester, polycarbonate, triacetylcellulose, nylon, and polyimide, as well as glassine paper, condenser paper,
Examples include metal foil and the like and composites of the above materials.

Examples of the composite include an aluminum/paper composite, metallized paper, or metallized plastic film. The thickness of the support is preferably about 2 to 15 microns when considering a thermal head as a heat source during thermal transfer, but it is preferable to use a heat source that can selectively heat the thermal transferable ink layer, such as a laser beam. There are no particular restrictions in this case. In addition, when using a thermal head, a heat-resistant protective layer made of silicone resin, fluororesin, polyimide resin, epoxy resin, phenolic resin, melamine resin, nitrocellulose, etc. should be provided on the surface of the support that comes into contact with the thermal head. Accordingly, the heat resistance of the support can be improved, or a support material that could not be used conventionally can be used.

In addition to hot melt coating as a coating method and gravure coating, roll coating, air knife coating, and wire barcode as a solvent coating method, printing methods such as gravure printing, gravure offset printing, and silk screen printing may also be used.

[Example] Next, the present invention will be explained in more detail with reference to Examples.

Example 1 A composition containing 20 parts by weight of O-paraffin wax and 80 parts by weight of toluene was dispersed on a polyester film having a thickness of 3.5 μm (sp 74.8°C) with a heat-resistant layer provided on the back surface using a ball mill and coated with a gravure roll. A release layer with a thickness of 4 μ layer was formed, and then 1.5 parts by weight of O carbon black was applied to the surface of the release layer.
w1n, E^ Content 2 0 Styrene < ao wt%) - Isoprene (40 wt%) - Styrene (30 wt%) type block copolymer (hardness Shore A88, melt index 9, Cauliflex TR1107, shell (manufactured by Kagakusha) 4,011ff
i part toluene 90 parts by weight of the composition was dispersed in a ball mill and coated with a gravure roll to 3μ-
An ink layer with a thickness of
A thermal transfer recording medium (A) was prepared by dispersing 45 parts by weight of the composition in a ball mill and forming a fixability improving layer with a thickness of 2 μm using a gravure roll coating method.

Example 2 In Example 1, the ink layer composition was replaced with ethylene-vinyl acetate copolymer MB-010 (Nippon Nijiriki Naka Co., Ltd.) instead of ethylene-ethyl acrylate copolymer MB-910.
Melt index 1200g/LOain.

A thermal transfer recording medium (B) was prepared in the same manner except that the vinyl acetate content was changed to 25%.

Example 3 In Example 1, the Pro-Tsuku copolymer of the ink layer composition was mixed with styrene (30 I!ffi%)-butadiene (4
A thermal transfer recording medium (C) was prepared in the same manner except that a styrene (30% by weight) type block copolymer (Califlex TR4113, manufactured by Shell Chemical Co., Ltd.) was used.

Example 4 In Example 1, the following was used instead of polyP-methylstyrene (Tg 101'C) in the fixability improving layer composition.

(4-1) PolyP-chlorostyrene (Tg 128°C)
→Thermal transfer recording medium (D) (4-2) Polyvinylcyclohexane (Tg 100℃
) → Thermal transfer recording medium (E) (4-3) Polymethyl methacrylate (Tg 105°C
) → Thermal transfer recording medium CP) (4-4) Polyethylene glycol dimethacrylate)
(Tg 11B°C) → Thermal transfer recording medium (C) Example 5 A heat-resistant layer was provided on the back side and a polyester film with a thickness of 3.5μ was coated with oxidized polyethylene wax (manufactured by Hoechst) (ap
: 113-118°C) 5 parts by weight O ethylene-dityl acrylate copolymer A-707 (three pieces)
Manufactured by DuPont Polychemical Company (Melt Index 2)
5g/1Osin, EA content 17%)
5ffi parts toluene
901 f1 part of the composition was dispersed in a ball mill and an adhesion improving layer with a thickness of 1 μm was formed using a gravure roll coating method, and then a thermal transfer recording medium (H) was prepared on the surface with the same configuration as in Example 1. .

Example 6 In Example 4, ethylene-vinyl acetate copolymer was used instead of ethylene-ethyl acrylate copolymer A-707 as EVAPLEX-410 (manufactured by Mikata DuPont Polychemical Co., Ltd.) (melt index 400 g/1OsIn,
A thermal transfer recording medium (1) was prepared in the same manner except that the vinyl acetate content was changed to 19%.

Example 7 A thermal transfer recording medium was produced in the same manner as in Example 4 except that the adhesion improving layer of Example 5 was provided.

(7-1) 'Fixing property improving layer of polyvinyl cyclohexane Thermal transfer recording medium (J) (7-2) 'Fixing property improving layer of polymethyl methacrylate Thermal transfer recording medium (K) Example 8 The release layer was heated in Example 1. A thermal transfer recording medium (L) was prepared with the same structure as in Example 1, except that the melt coating method was changed and a release layer coating was formed.

Example 9 A thermal transfer recording medium (M) was produced with the same configuration as in Example 1, except that the release layer and ink layer in Example 1 were changed to a hot melt coating method, and a release layer coating film and an ink layer coating film were formed. Created.

Example 10 Example 1 except that the release layer, ink layer, and fixing property improving layer were changed to a hot melt coating method, and a releasing layer coating film, an ink layer coating film, and a fixing property improving layer coating film were formed. A thermal transfer recording medium (N) was prepared with the same configuration as Example 1.

Comparative Example 1 Ethylene-ethyl acrylate copolymer MB910 of the ink layer in Example 1 [manufactured by Nippon Unicar Co., Ltd.]
(Melt index L100g/1o1n.

A thermal transfer recording medium (A) was prepared in the same manner except that only EA-28%) was used.

Comparative Example 2 In Example 2, ethylene-vinyl acetate copolymer MB-010 (manufactured by Nippon Unicar, melt index 1200 g/lO++in, vinyl acetate content 2) was used in the ink layer.
A thermal transfer recording medium (b) was prepared in the same manner except that only 5%) was used.

Comparative Example 3 A thermal transfer recording medium (c) was prepared in the same manner as in Example 1 except that the fixability improving layer was not provided.

Comparative Example 4 A thermal transfer recording medium was prepared in the same manner as in Example 1 using the following material instead of polyP-methylstyrene (Tg 101''c) in the fixability improving layer.

(4-1) Polyvinyl chloride (Tg 80°C) - Thermal transfer recording medium (d) (4-2) Poly tert-butyl acrylate (7g4
3℃) - Thermal transfer recording medium (e) (4-3) Polyethylene terephthalate (7g 70℃)
- Thermal transfer recording medium (A) Thermal transfer recording medium (A) of the example obtained as described above -
(N) and the thermal transfer recording media (a) to (f) of the comparative examples were processed using a thermal transfer printer (prototype machine...the head was 1 μ/am) at a head energy of 14 mJ/dat and a printing speed of 1.
50 characters were printed in 7 seconds. As the transfer paper, paper with a Beck smoothness of 25 seconds was used. The printing results are shown in Table-1.

[Effects] As is clear from the above explanation, the thermal transfer recording medium of the present invention has excellent thermal transfer properties during high-density printing and high-speed printing, and is capable of high-resolution printing not only on paper with high smoothness but also on paper with low smoothness. Images can be given.

It also has excellent image fixing properties and is effective against ribbon blocking.

[Brief explanation of the drawing]

1 and 2 are diagrams schematically explaining the layer structure of the thermal transfer recording medium of the present invention. l...Support, 2...Peeling layer, 3...Ink layer,
4... Fixability improving layer, 5... Adhesive layer.

Claims (3)

[Claims] (1) A release layer mainly composed of wax with a melting point of 50 to 90°C is provided on the support, and a colorant and a copolymer of ethylene and ethyl acrylate or vinyl acetate with a melt index of 50 to 4000 g/10 min are provided on the support. (ethylene content: 70 to 90% by weight) and a styrene-isobrene-styrene type and/or styrene-butadiene-styrene type block copolymer as the main components, and furthermore, an ink layer with a glass transition point of 100°C or higher is provided. A thermal transfer recording medium characterized by sequentially laminating fixing property improving layers containing resin as a main component. (2) Between the support and the release layer, use oxidized polyethylene wax with a melting point of 100°C or higher and a melt index of 10 to 60.
Copolymer of 0 g/min ethylene and ethyl acrylate or vinyl acetate (ethylene content 70-90% by weight)
2. The thermal transfer recording medium according to claim 1, further comprising an adhesive layer containing as a main component. (3) The thermal transfer recording medium according to claim (1) or (2), wherein any one of the layers on the support is composed of fine particles.