JPS63172688A - Resin composition for thermal transfer recording medium and thermal transfer recording medium - Google Patents

Abstract

PURPOSE:To prevent sticking and blocking, by incorporating a silicone resin having a softening point of not lower than a specified temperature and at least one resin selected from the group consisting of a polyester resin, a polyamide resin, a cellulose resin and an acrylic resin. CONSTITUTION:A resin composition for a thermal transfer recording medium comprises (A) a silicone resin having a softening point of not lower than 60 deg.C and (B) at least one resin selected from a polyester resin, a polyamide resin, a cellulose resin and an acrylic resin. By the use of the silicone resin having the softening point of not lower than 60 deg.C, the thermal transfer recording medium obtained is further enhanced in sticking resistance and blocking resistance, and constituents of a backing layer do not migrate into a coloring material layer, so that the printing performance of the recording medium is maintained even when the medium is preserved for a long time. The composition ordinarily comprises the component (A) and the component (B) in an amount of at least 10 wt.% each, and the weight ratio (A)/(B) is preferably 80/20-10/90, particularly, 60/40-15/85.

Description

[Detailed description of the invention] [Industrial application field] Unreleased I! il relates to a resin composition for thermal transfer recording media and a thermal transfer recording medium using this resin composition for thermal transfer recording media.

"Prior Art and its Problems" Conventionally, thermal transfer recording media are formed by forming a coloring material layer containing a meltable substance on the surface of a long film support made of polyester, for example. In many cases, this thermal transfer recording medium is shipped and stored in a rolled state.Then, this thermal transfer recording medium in the rolled state is provided with the coloring material layer on a film support. A part of the color material layer is melted by heating from the opposite side with a thermal head, for example, and the melted color is applied to the surface of the recording sheet such as paper that comes into contact with this thermal transfer recording medium. By transferring the material layer, a printed image is formed on the surface of the recording sheet.

However, with conventional thermal transfer recording media, when thermal transfer is performed using a thermal head, sufficient print image e.g.
2. A so-called "stay" process in which the film support itself or a thermal spatula is fused with the heat energy necessary to increase the temperature (1) during transfer. When the king phenomenon occurs, the thermal transfer recording medium becomes unable to run, or in severe cases, the thermal transfer recording medium breaks from that part. As mentioned above, since it is stored in a rolled state, the back of the support and the coloring material layer may stick to each other due to long-term storage.
The so-called blocking phenomenon may occur. Once the blocking phenomenon occurs, it becomes impossible to run the thermal transfer recording medium in the spiral shape y5 smoothly.

In order to solve these problems, several attempts have been made to provide a backing layer on the back side of the film support that has heat resistance and protects the thermal transfer recording medium. Method of providing a silicon oxide layer as a metal layer or wear-resistant layer (Unexamined Japanese Patent Application IM3S4-14:
No. 1152-A, JP-A-1Q57-74195), a method of providing a layer of heat-resistant resin such as silicone resin or fluororesin (see JP-A-55-7467)
, a method of providing a resin layer to which a peripheral or semi-solid surfactant is added at room temperature (see JP-A-57-129789), or a method of providing a layer containing a lubricating inorganic pigment in a ml thermoplastic resin. A method (see Japanese Unexamined Patent Publication No. Sho 5ki-155974) has been proposed.

However, what is the method for such a proposal?

Prevention of sticking phenomenon and blocking phenomenon 1F
There may be problems such as insufficient oxidation, or the need for special means such as vapor deposition, curing, and icing that require large production costs.

In addition, generally used liquid or semi-solid silicone resin or heat-resistant resin such as fluororesin
A thermal transfer recording medium is formed by coating TR1 on the back side of a film support during long-term storage.

Or, if left under high temperatures for a long time, silicone resin or fluorocarbons may form.
It may migrate to the surface of the coloring material layer itself and altering the quality of the coloring material layer. According to Inspection 3.1 of the present inventor, if this transfer to the surface of the heat-resistant resin or color material layer occurs, the printing performance will significantly deteriorate, such as uneven transfer and chipping of the printed image. It turned out.

[Object of the Invention] The first object of the present invention is to provide a resin composition for thermal transfer recording media that can prevent the occurrence of sticking phenomena and blocking phenomena, and to provide a resin composition for thermal transfer recording media that can be formed using the resin composition for thermal transfer recording media. An object of the present invention is to provide a thermal transfer recording medium having a backing layer of

The second purpose of undeveloped IJI is to develop a resin composition for thermal transfer recording media that can form a backing layer without significantly affecting the production costs of curing, icing, etc. and without requiring special means. An object of the present invention is to provide a thermal transfer recording medium having a backing layer formed using the thermosensitive transfer recording body resin composition II.

A third object of the present invention is to provide a resin composition for thermal transfer recording media that does not transfer backing layer forming components to the coloring material layer even when stored in a rolled form for a long period of time or under high temperature conditions, and its sensitivity. An object of the present invention is to provide a thermal transfer recording medium having a backing layer formed using a resin composition for thermal transfer recording media.

[Means for solving the above problems] The first gist of the present invention for solving the above problems is (
A) Silicone resin with a softening point of 60°C or higher.

(B) A resin 1111 composition for thermal transfer recording media characterized by containing at least one resin selected from the group consisting of a polyester resin, a polyamide resin, a cellulose resin, and an acrylic resin.

Furthermore, Thu 3i! ! The second gist of the patent is that in a thermal transfer recording medium having a coloring material layer formed by dispersing a coloring material in a heat-melting binder on one side of a film support, the color of the film support is On the surface where the material layer is not provided, (A
) A backing layer comprising a silicone resin having a softening point of 60° C. or higher and (B) at least one resin selected from the group consisting of polyester resins, polyamide resins, cellulose resins, and acrylic resins. This is a characteristic thermal transfer recording medium.

First, the resin composition for thermal transfer recording media of undeveloped +51 will be explained.

The silicone resin has a softening point of 60° C. or higher, and is resinous or solid at normal humidity. In the present invention, the softening point is a value measured in accordance with ASTM D 1525. If the softening point is lower than 60° C., the backing layer during printing will be softened and the blocking phenomenon may not be effectively prevented. In particular, in the present invention, by using a silicone resin with a softening point of 80° C. or higher, the resulting thermal transfer recording medium has better stinking resistance and blocking resistance, and it is also possible to form a backing layer on one color material layer. Since the components do not migrate, the printing properties will not deteriorate even if stored for a very long time.

The silicone resin, which is component (A), is one that has 41 siloxane bonds and an alkyl group such as a methyl group on the silicon atom, and is resin-like or solid at room temperature, and is called an organopolysiloxane. Can be done. Examples of organopolysiloxanes that can be used in the present invention are shown below.

R-(-3i-0-)n-R Furthermore, in the present invention, in addition to the above organopolysiloxane, epoxy-modified, olefin-modified, ether-modified, alcohol-modified, unmodified, amino-modified, mercapto-modified and carboxyl Modified polysiloxane resins in which the alkyl groups have been subjected to various modifications such as modification, and resins in which parts of urethane resins, acrylic resins, polyester resins, etc. are silicone-modified with the polysiloxanes (either the silicone part or the entire resin) 5~
40% by weight is preferred) can be used.

An example of the structural formula of the modified polysiloxane resin 1i1 is as follows.

Formula (1) Formula (2) Formula (C) Formula (4) Formula (5) Formula (6) Me (C112)-3ll In the above formulas (1) to (6), m, n , a, b, c and , and Me represents a methyl group.

In the present invention, among these silicone resins, silicone-modified resins are preferred, and among silicone-modified resins, silicone-modified urethane resins in which a part of the urethane resin is modified with the above-mentioned sulganoborisiloxane or modified polysiloxane resin are preferred. Branches are also preferred.

Examples of suitable silicone-modified urethane resins are shown below.

However, in formula (7), p and 9 represent integers.

:jS Formula (8) where, in Formula (8), p and q have the same meanings as above, and r represents an integer.

Further, R' in formulas (7) and (8) is a group represented by formulas (9) to (12) shown below.

Formula (9) However, in formula (9), S represents an integer.

However, in formula (10), 5 has the same meaning as above.

However, in formula (11), S has the same meaning as above.

However, in formula (12), S represents the same meaning as above.

Weight ratio (X) of urethane resin part (x) and silicone resin part (Y) in ji
: Y) is usually 992 l to 5:95 (preferably 95:5 to 10:90).

The specific resin that is the component (B) is at least some resin selected from the group consisting of Bossester resins, polyamide resins, cellulose resins, and acrylic resins.

The polyester resin is not particularly limited as long as it is generally referred to as thermoplastic bossester.
Copolymers can also be used, but their molecular weight is between 5,000 and 100,000. Especially 10000-200
It is preferable that the temperature is 0, and the softening point (according to the same test standard as above #! 6) is 70°C or higher, especially 100°C.
℃ or higher, and furthermore, when formed into a film, its tensile breaking strength (to STMD6 8-61
T) is preferably 480 or more.

Examples of the cellulose resin include cellulose esters such as acetylcellulose, nitrocellulose, and ayatylbutylcellulose, and cellulose ethers such as ethylcellulose, methylcellulose, benzylcellulose, and carboxymethylcellulose.

The polyamide resin is not particularly limited and includes, for example, nylon 5, nylon 8. Examples include nylon 11, nylon 66, and nylon 510. In addition, copolymers can also be used. Among various polyamide resins, those with a molecular weight of 10,000 or more and a softening point (based on the same test standards as above) of 70°C or more, especially A polyamide resin having a temperature of +10° C. or higher is preferable.

Examples of the acrylic resin include methyl acrylic, ethyl acrylate, methyl methacrylate, ethyl methacrylate, acrylonitrile, acrylamide, and homopolymers of their derivatives, as well as the various acrylic threads and vinyl acetate. , vinyl chloride, styrene, or copolymers with maleic anhydride and the like. Among various acrylic resins, those with a molecular weight of 5000~
700,000, particularly preferably from 10,000 to 5oooo, and preferably has a softening point (based on the same test standards as above) of 70°C or higher, especially 90°C or higher.

Particularly in the present invention, polyester resins or cellulose resins are preferred among these CB)Ijt components, cellulose resins are preferred among both, and a particularly preferred cellulose resin is nitrocellulose.

In the resin composition for thermal transfer recording media, each of the components (A) and (B) is usually contained in an amount of 10% by weight or more.
1 included.

1iJ (A) Component silicone resin and the above (B)
The preferred blending ratio with the components is (A) component/(B
) components (weight ratio) of 80/20 to 10/90, particularly preferably 60/40 to Is/85.

The resin composition for thermal transfer recording media of the present invention comprises the above-mentioned (A)
The object of the present invention can be achieved without the need for other components, such as a curing agent, as long as the composition contains component (B) and component (B). However, in addition to the above ingredients, waxes,
It may contain additives such as surfactants, higher fatty acid derivatives, higher aliphatic alcohols, higher aliphatic esters, and phosphoric acid esters.

Examples of the wax include paraffin waxes such as paraffin wax, microwax and polyethylene wax, beeswax, carnauba wax,
Examples include natural waxes such as tallow fatty acid and wood wax, ester waxes such as Hoechst wax, and synthetic waxes such as Fischer-Trosch wax. Among these, paraffin wax is preferred.

The surfactant may be any of nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants, but nonionic surfactants are preferred.

Examples of nonionic surfactants include polyoxyethylene oleyl ether, boxoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene octylphenol ether, boxoxy Ethylene monolaurate, polyoxyethylene monostearate, polyoxyethylene monooleate, polyoxyethylene glycol, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, oxyethylene oxypropylene block bomber,
Examples include glycerol monostearate and polyoxyethylene distearate.

Examples of the higher fatty acid derivatives include stearic acid, palmitic acid, behenyl, myristic acid, and 1,
higher +rt fatty acids such as 20-eicosanol; higher fatty acid amides such as stearamide, oleamide and balmityroamide; higher fatty acid esters such as butyl stearate, ethyl palmitate and myristyl stearate; and sodium, potassium, magnesium and zinc of said higher fatty acids. Examples include metal salts such as.

Examples of the aliphatic alcohol 1i1 include higher alcohols such as stearyl alcohol, valmityl alcohol, behenyl alcohol, myristyl alcohol, marganyl alcohol, and eicosanol.

Heavy industry higher aliphatic esters include the various higher aliphatic alcohols mentioned above, xylitol, pentaerythritol,
Examples include polyesters including monoesters with propylene glycol, glycerin, or hathyl alcohol, or monoesters or diesters with hathyl alcohol.

Examples of the phosphoric acid ester include dipolyoxyethylene todecyl ether phosphate, trioxyethylene dodecyl ether nitride phosphate, glycerin phosphate, and bosotalicerine nitride phosphate.

These eight types of components may be used individually, or two or more types may be blended.

The content of component (C) in the backing layer is usually within the range of 1 to 20% by weight.
It is blended into a resin composition for thermal transfer recording media. Particularly preferred is 1 to 9% by weight.

The loose kink layer of the thermal transfer recording medium may contain other resin components in addition to the components (A) and (B) described in Iij and, if necessary, the component (C), within a range that does not impair the characteristics of this layer. It may contain one or more compounding agents, such as inorganic fine particles, which are usually added to the Hanking layer.

Examples of the other resin components include thermoplastic polyacrylamide and polyvinyl alcohol.

Examples include phenoxy resins, polyurethane resins, and phenolic resins.

Examples of the a-free fine particles include calcium carbonate, talc, clay, silica gel, and metal powder.

The composition of other resin components and inorganic fine particles can be determined as appropriate within a range that does not impede the object of the present invention.

The resin composition for a thermal transfer recording medium of the present invention is a mixture of component (A), component (B), component (C) if necessary, and the above-mentioned compounding agents added as necessary.

This resin composition for a heat-sensitive transfer recording medium is coated on the surface of a film support of a heat-sensitive transfer recording medium to form a hollow layer.

The thickness of the backing layer of the present invention is usually 0.01 gm.
That's all. However, in practical terms, 0.03 to 1.0 hirom
Or preferable.

The film support may be any resin film with excellent surface smoothness and dimensional stability; ) can be cited as a specific example. The thickness of these film supports is not limited, but is preferably about 2 to 154 m. These film supports are coated with corona discharge or glow radiation on the surface of the film support in order to improve the adhesion of the backing layer. [, Other TL air shock treatment, flame treatment, ultraviolet irradiation treatment, oxidation treatment, saponification treatment, surface roughening treatment, etc. may be performed, or the material may be subjected to subbing processing.

Examples of methods for applying the finger composition (for heat-sensitive transfer recording media) on the film support include a method of solvent coating with a coating solution in which the resin composition for heat-sensitive transfer recording media is dispersed or dissolved in a solvent. be. The solvent used at this time may be any solvent as long as it can dissolve or disperse each component of the present invention, such as n
-Paraffinic solvents such as hexane, sogeloin and isoparaffin, aromatic solvents such as toluene and xylene, ketone solvents such as acetone, methyl ethyl ketone and methyl isobutyl ketone, alcoholic solvents such as methanol, ethanol, propanol and butanol, acetic acid Examples include ester solvents such as ethyl, organic solvents such as special solvents such as dimethylformamide and dimethyl sulfoxide, and mixed solvents thereof may also be used.
6 The resin composition for thermal transfer recording media can also be used as a coating liquid by dispersing it in water.

For coating, any coating technique can be used, such as a reverse roll coater method, an extrusion coater method, a gravure coater method, or a wire bar coating method.

The thermal transfer recording medium of the present invention has at least one coloring material layer on the surface of the film support opposite to the surface on which the backing layer is formed. This coloring material layer is usually a layer in which a coloring material is dispersed in a binder (e.g., a heat-melting substance and a heat-softening resin).9 The coloring material layer is directly laminated on the film support. Alternatively, they may be laminated with a release layer interposed therebetween, and a protective layer or the like may be provided on the coloring material layer.

As the coloring material constituting the coloring material layer, for example, pigments such as carbon black or dyes of various companies, recording,
Any commonly used in the field of reproduction can be used. As a binder, heat-melting substances such as paraffin, carnauba wax, beeswax, candelilla wax, and low molecular weight petroleum resins having a low melting point, and/or polystyrene, styrene-butadiene copolymer, and ethyl cellulose can be used. It is also possible to use high molecular weight polymers (heat-softening resins) such as cellulose esters such as or cellulose acetate butyrate.

Note that this coloring material layer may contain, in addition to the coloring material and binder, a surfactant, a low-resistance treatment agent, a polymer electrolyte, a sakatsuki salt, and the like.

Further, the thickness of this coloring material layer is usually 15 gm or less (preferably 1 to IS#Lm).

[Effects of the Invention] According to Suikan LYJ, it is possible to provide a resin composition for a thermal transfer recording medium and a thermal transfer recording medium that have the following excellent advantages.

(1) This resin set for thermal transfer recording media! & things.

It has sufficient heat resistance to coat the surface of the support and then apply a coloring material layer to the opposite surface.

(2) A thermal transfer recording medium using this resin composition for a thermal transfer recording medium as a backing layer may cause a blocking phenomenon between the backing layer and the coloring layer even if it is stored in a rolled state for a long period of time. Even if you don't or want to use this thermal transfer recording medium after storing it for a long time,
This thermal transfer product Q medium can be smoothly pulled out from the rolled state, and images can be printed smoothly with a thermal head without causing any sticking phenomenon.

(3) When printing an image with a thermal head, the surface of the thermal head is not contaminated even though the thermal head slides against the backing layer of the thermal transfer recording medium.
Furthermore, no sticking phenomenon occurs.

(4) The resin composition for thermal transfer recording media used as the backing layer does not migrate, so if this thermal transfer Q medium is stored for a long period of time, it may come into contact with the coloring layer or the backing layer. Despite this, it is possible to transfer a clear image without uneven transfer or defects.

(5) Since the softening point of silicone resin is 60°C or higher, it is in a resinous or solid state at room temperature.
A puffing layer with good properties can be formed without using a curing agent. Be hesitant.

Processes such as curing or aging, which are essential when using a curing agent, are no longer necessary, and the manufacturing process can be simplified. Furthermore, an aqueous solvent can be used as the solvent, and in this case, the thermal transfer recording medium can be manufactured at a lower cost, and the thermal transfer recording medium can be manufactured in a safe environment. .

[Example] Next, Examples and Comparative Examples of the present invention will be shown.

In addition, in the examples and comparative examples described below, "
"Parts" indicates "parts by weight."

(Example 1) Bonnisdell resin [Vylon 200 J (trade name), manufactured by Toyobo Co., Ltd.] and silicone-containing polymer [softening A182°C, 5P-20:IV (trade name), manufactured by Dainichiseika Kogyo 121] 2g with a mixing ratio of 3/7 (weight ratio)
f D% solution (methyl ethyl ketone/toluene = 674
) was prepared and used as a coating liquid CI) for a backing layer of a thermal transfer recording medium.

3. Apply this coating liquid. Using a wire bar on a polyester film support of Sp, m, the dry film thickness was 0.12 m.
The mixture was heated to 9:67° C. and left in a constant temperature bath at 50° C. for 48 hours.

Next, one layer of a coloring material layer composition having the following composition was applied to the surface of the film support on which the two backing layers were not provided.
Insulated at 20°C, made into a molten Y island, and dried coating thickness: 1
．． Apply to 5#Lm using a wire bar.
Thus, a thermal transfer recording medium of the present invention was obtained.

Carnauba wax・・・・・・・・・・・・・・・・・・
...40 parts wax (paraffin wax l55
F)...40 parts ethylene-acrylate copolymer.
・・・・・・・・・5 parts carbon black・・・・・・・・・
・・・・・・・・・・・・・・・15 parts (Examples 2 to 5) In Example 1, instead of SA, @, 47 mouth liquid (1) for backing sound of transfer recording medium, Coating liquid (II) for backing sound of thermal transfer recording media described below
- (V) was prepared and used.

A thermal transfer recording medium was produced in the same manner.

-■ -2% by weight methyl ethyl ketone solution of -41 Uniboss ester resin (byron 200 same)...70 parts organopolysiloxane (softening point: 98℃ 15P-2105 (trade name), Dainichiseika ■ 2% by weight toluene solution of
......30 parts, right m-3 organopolysiloxane (softening point: 82℃15P-20
] V, same as before) in a 2% by weight ketone/toluene solution (volume ratio -1/l) 30 parts of polyamide (
2% by weight isopropyl alcohol/toluene mixed solvent (volume ratio = 8/2) of Sanmide I 6158 (trade name), Sansei Kagaku ■S2) (volume ratio = 8/2)
...70 parts - Coating JL liquid ■ Kudoko silicone modified urethane resin (softening point: 62℃, 15%
2% by weight methyl ethyl ketone solution of modified urethane resin (modified urethane resin)...15 parts 2% by weight methyl ethyl ketone solution of polyester (Vylon 200, same as above)...8
Part 5 1. - 2% by weight methyl ethyl ketone solution of silicone-modified urethane resin (softening point: 62°C 1 time)
・・・・・・・・・・・・・15 parts Polyester (Byron 200, same as before) 2% methyl ethyl ketone solution 60 parts Polyethyleneisoocdecyl alcohol 2% toluene solution············
...25 parts (Comparative Examples 1 to 5) Instead of the coating liquid in Example 1, the following coating liquid was used!
J#AL, A thermal transfer recording medium was manufactured in the same manner as in Example 1, except that a backing layer was formed using each of these coating liquids.

1- (1-Cl Boss ester resin (Vylon 200 (same as above)) 2% by weight methyl ethyl ketone/toluene solution (volume ratio 1:1)・・・・・・・・・1
00 parts right; II-C2 polyorganosiloxane (softening point: 80°C.

5P-212V (55 product names) manufactured by Dainichiseika tI) 2 tons: I', % methyl ethyl ketone solution...100 parts right'' III-Cl3 Polyorganosiloxane (liquid at normal humidity,
Product name) 2% by weight n-hexane solution (manufactured by Shin-Etsu Chemical Co., Ltd.) 100 parts, l・i T
V-(=L comparison f polyester resin (Vylon 2
2% by weight methyl ethyl ketone/toluene solution (volume ratio -1:1) of
Toluene solution of 50 parts paraffin wax (Paraffin 155 (tA product name) manufactured by Kanto Kagaku ■)...5
0 parts..., IV-C5 2 wt% nitrocertol solution in methyl ethyl ketone...100 parts 1-1 The obtained thermal transfer recording medium was subjected to a blocking test, a sticking test, and a storage test under the conditions described below. and heat resistance tests were conducted and evaluated.

-Blocking test- A thermal transfer recording medium with a width of 1 mm and a tension of 9 Sg and an outer diameter of 17
The material was wound around a core of 1.5 mm in diameter and baked in an atmosphere of 55° C. for 3 days, and then unrolled while being unrolled, and the unwinding torque due to blocking was set at 3 to evaluate the blocking resistance.

Meanings of the symbols in Table 1 O: The backing layer and the coloring material layer are not bonded together at all.

O: The backing layer and the coloring material layer are slightly bonded.

X: The backing layer and the coloring material layer are stuck together, making it difficult to unwind.

- Sticking prevention test - A thermal transfer recording medium was subjected to an applied voltage of 0.7 W per heating element using a thermal head with an element density of 8 mm/mm.
Recording was performed under conditions of an application time of 21 mm seconds, and the anti-sticking effect was evaluated.

Meanings of the symbols in Table 1 ◎... There was no damage to the polyester film that was the support.

○: Some damage occurred to the Bossester film.

×...Bossester film was broken.

-Storage Test- Under the same conditions as the blocking test, the thermal transfer recording medium was stored for one month and then printed using a commercially available word processor.

The print quality was measured by paying attention to the missing characters in the print, and the storage performance was evaluated.

Meaning of the symbols in Table 1 0... There are no gaps in the printed characters! '! 1
Most are 1.

×...The printed characters are missing or difficult to read.

-1 ftJ thermal test - The backing layer of the thermal transfer recording medium was brought into contact with the surface of a heat roll heated to 100°C, and the degree of adhesion of the backing layer to the heat roll surface was measured to evaluate heat resistance.

Meanings of the symbols in Table 1◎...The backing layer does not adhere to the surface of the hot roll at all.

O: A slight amount of backing layer adheres to the surface of the hot roll.

X: A large amount of backing layer adheres to the surface of the hot roll.゛Table 1 (hereinafter blank) (Examples 6 to 8) In Example 1, instead of the coating liquid (I) for backing sound of a thermal transfer recording medium, a backing of a thermal transfer recording medium having the composition described below was used. Coating liquid for sound (vl) ~ (V
A thermal transfer recording medium was produced in the same manner except that Example 1) was manufactured by A and used.

・, ■ Knee-6 polyester resin (Byron 200, same as before) double %
Methyl ethyl ketone/toluene solution (volume ratio -1 to 1)...
90 parts organopolysiloxane (softening point: 98°C 15p
-zoos, same as above)) methyl ethyl ketone/toluene solution (volume ratio -1/1) 10 parts -'
−■ −−−7 Nitolcellulose 2% by weight methyl ethyl ketone solution・・・・・・・・・・・・・・・
90 parts organobosiloxane (softening point: 98°C 5P-
Methyl ethyl ketone/toluene solution (volume ratio -■:1) of 2105, same as above)...10 parts, i-
'VIE T-8 2% by weight methyl ethyl ketone solution of nitolcellulose・・・・・・・・・・・・・・・
90 parts organopolysiloxane (softening point: 82°C 3P-
Methyl ethyl ketone/toluene solution (volume ratio -1:l) of 20"lV (same as above)...10 parts (Comparative Examples 6 to 11) In Example 1, backing sound of thermal transfer recording medium Coating liquids (vr-c) to (xr
A thermal transfer recording medium was produced in the same manner except that -c) was prepared and used.

, i-Vl -C6 2% by weight methyl ethyl ketone solution of nitolcellulose...
2% by weight methyl ethyl ketone/toluene solution (volume ratio -1:1) of 90 parts silicone resin (liquid at room temperature, 5776 (product name) manufactured by Shin-Etsu Silicone V4)...
IO part 'L1- ■ -C top 7 Nitol cellulose 2 beads % Methyl ethyl ketone solution・・・・・・・・・・・・・・・
90 parts 2% by weight methyl ethyl ketone solution of silicone resin (liquid at room temperature, 507226, (product name) manufactured by Toshi Silicone ■)...10 parts!
■-〇1.8 Organopolysiloxane (softening point: 98℃3P-210
5 (same as above)) methyl ethyl ketone/toluene solution (volume ratio 1:1)...100 parts;;/
IX-C9 Organopolysiloxane (softening point: 82°C, 5P-20
3V, same as above) methyl ethyl ketone/toluene solution (volume ratio -1:1) 100 parts i
X-C10 2% by weight methyl ethyl ketone/toluene solution of silicone resin (liquid at room temperature, KS776, same as above) (volume ratio ~l:f)...1
00 parts, 2 of XI-Cl 11 silicone resin (liquid at room temperature, 5D7226 (SR product name) made by Toshi Silicone ■)
Weight % methyl ethyl ketone solution: 100 parts -1 The obtained thermal transfer recording medium was subjected to a storage test under the conditions described below.

-Storage test: After 1 month under dry conditions at 50°C, -Inspection-like dot reproducibility (25mJ/head, 300DPI)
) were compared.

Meanings of symbols in Table 2 ◎... No missing dots, good reproducibility 0...
... Some dots are missing, but the reproducibility is within the practically acceptable range △...-- Some dots are missing, and the reproducibility is outside the practically acceptable range There are so many chips that it cannot be used after purchase (margins below) Table 2

Claims (8)

[Claims] (1) (A) silicone resin with a softening point of 60°C or higher;
B) A resin composition for a thermal transfer recording medium, comprising at least one resin selected from the group consisting of a polyester resin, a polyamide resin, a cellulose resin, and an acrylic resin. (2) The resin composition for a thermal transfer recording medium according to claim 1, wherein the silicone resin (A) is a silicone-modified resin. (3) The resin composition for a thermal transfer recording medium according to claim 1, wherein the component (B) is a cellulose resin. (4) The softening point of the silicone resin (A) is 80°C.
The resin composition for a thermal transfer recording medium according to claim 1, which is as described above. (5) In a thermal transfer recording medium having a coloring material layer formed by dispersing a coloring material in a heat-melting binder on one surface of a film support, the coloring material layer of the film support is provided. (A) a silicone resin with a softening point of 60° C. or higher; and (B) at least one resin selected from the group consisting of polyester resins, polyamide resins, cellulose resins, and acrylic resins. A thermal transfer recording medium characterized by having a backing layer. (6) The thermal transfer recording medium according to claim 5, wherein the silicone resin (A) is a silicone-modified resin. (7) The thermal transfer recording medium according to claim 5, wherein the component (B) is a cellulose resin. (8) The softening point of the silicone resin (A) is 80°C.
The thermal transfer recording medium according to claim 5, which is the above.