JPH011591A - thermal transfer sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a thermal transfer sheet, and more specifically, the present invention relates to a thermal transfer sheet, and more specifically, a method for transferring a recorded image with excellent 1.8 stability onto a transfer material. The purpose of the present invention is to provide a thermal transfer sheet that can be used in various ways.

(Prior art) Various thermal transfer methods have been known in the past, but among them, a thermal transfer sheet is prepared by using an elevating/IW dye as a recording agent and supporting it on a base sheet such as paper to form a thermal transfer sheet. A transfer material that can be dyed with a dye, such as polyester woven fabric, is coated with thermal energy lj in a pattern from the back side of the thermal transfer sheet to transfer the ascending dye to the transfer material.
A transcription method is being used.

(invention or problem to be solved)
- In the transfer method, in the Shosen textile printing method, where the transfer material is made of polyester JtI+T, etc., the application of thermal energy is relatively long, so the transfer material itself is also heated by the attached thermal energy. As a result, relatively good dye migration is achieved. .

However, with advances in recording methods, thermal heads and other devices are used to print at high speeds on transfer materials such as polyester sheets and paper with a dye-receiving layer. When forming characters, graphics, or direct images, the thermal energy addition is about rp seconds or more.
Therefore, in such a short period of time, r7°f+'< ff Since the dye and the transfer material are not sufficiently heated, it is not possible to form an image with 70% density. Can not.

Therefore, in order to support such high-speed recording, the
Sublimation dyes with excellent properties have been developed, but dyes with excellent properties in reducing stomach pain generally have small molecular weights, so the dye may migrate over time into the transfer material after transfer or may not reach the surface. Problems arise in that the image that has been painstakingly formed becomes distorted or unclear due to bleed, or that it contaminates surrounding articles.

In order to avoid such problems, a relatively large increase in the molecule) I'Q\+II1. When a dye is used, the rise/li speed is poor in the high-speed recording method as described above, so that it is not possible to form an image with a satisfactory density as described above.

Therefore, in the thermal transfer method using a 1-reactive dye, by adding thermal energy in an extremely short time as described above, a clear image with high density can be produced in 1 minute, and the formed image can be At present, there is a strong demand for the development of thermal transfer sheets that exhibit excellent fastness properties.

As a result of intensive research in response to the strong demands of the industry as described above, the inventor of the present invention found that conventional polyester weaving was possible! In sublimation printing methods such as No. 6, the surface of the woven fabric is not smooth, so the thermal transfer sheet and the woven fabric, which is the material to be transferred, do not come into close contact with each other. ζ Color or vaporizability (i.e., the ability to migrate through the space that exists between the thermal transfer sheet and the woven fabric) were essential conditions, but polyester sheets with smooth surfaces and surface treatments were also required. When paper or the like is used as a material to be transferred, the thermal transfer sheet, material to be transferred, and power source are in close contact with each other during thermal transfer, so sublimation and vaporization of the dye are not the only absolute requirements; The ability of the dye to transfer through the interface due to heat T1 is also extremely important, and the thermal transferability of such an interface varies greatly depending on the chemical structure of the dye used, the substituent, or its position.
By knowing that the molecular weight of the dye is high and selecting a dye with an appropriate molecular structure,2 even if the dye has a high molecular weight, which is considered to be unusable according to conventional academic knowledge, It has been found that this material has good heat transfer properties. By using a thermal transfer sheet that supports such dyes, the dyes used can be easily transferred to the transfer material even when thermal energy is applied for an extremely short period of time, resulting in high density and excellent fastness. The present invention was completed based on the finding that a recorded image having a unique character can be formed.

(Means for Solving the Problems) That is, the present invention comprises a base sheet and a dye-carrying layer formed on one side of the base sheet, and the dye contained in the dye-carrying layer is , a thermal transfer sheet characterized by being a dye represented by the following formula (I).

(However, R in the above formula is a hydrogen atom, a halogen atom, a substituted J, an alkyl group, an aryl group, a cycloalkyl group, an arylalkyl J^, an alkoxy group, an acylamino group, an aminocarbonyl group) represents a substituent such as a group, n represents 1 or 2, R2 and RJ represent an alkyl group or a substituted alkyl group, R2 and R3 may be taken together to form a ring. Represents an unsubstituted phenyl group, naphthyl''^, furan J! or coumaron group.)
(Preferred Embodiments) Next, the present invention will be described in more detail by citing preferred embodiments. It has been found that when used as a dye, it exhibits an unexpectedly high heat transfer rate, and furthermore, after transfer, an image with excellent fastness, particularly excellent storage stability and light fastness, can be obtained. In particular, when the molecular weight of the dye was 350 or more, more preferably 380 or more, the above effects became more pronounced.

The cyanoacetyl dye represented by formula (1) above is:
It is obtained by a conventionally known production method in which N,N-dialkyl-P-phenylenediamine or a derivative thereof is reacted with a cyanoacetyl coupler.

4- In the dyes of the present invention obtained as described above, particularly preferable dyes are - in the formula, where the group is hydrogen atom 1'-, halogen atom /-, lower alkyl such as methyl, ethyl, propyl, butyl, etc. group or methoxy, ethoxy, propoxy,
It is an alkoxy group such as butoxy J^, [L 1 (2 and R3 are hydroxyl group, amine group, alkylamino], (acylamino group, sulfonylamino J, L, aminocarbonyl group, aminosulfonylalkoxy sulfonyl group, Methyl, ethyl, which may have polar substituents such as alkoxysulfonyl group, cyano group, alkoxy group, phenyl group, cycloalkyl group, haloken atom or nitro group,
It is a 61 to C20 alkyl group such as propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, lanticyl, dodecyl, hexadecyl, etc., and X is a hydrogen atom or the above various polar substituents or the above nonpolar substituents. It may have a phenyl group, naphthyl'^, a furan group or a coumaron group, and the dye content 7'h1 is 350
More preferably, the group is selected to have a molecular weight of 380 or more.

According to detailed research by the present inventor, in the dye of formula (I), as R to R3 and X, groups other than hydrogen,
For example, by selecting substituted or unsubstituted alkyl J, t, etc., the dye molecule: 11 increases and the minute F H
k will exceed 350 or 380, but 11"
Contrary to the conventional general idea regarding dyes with mathematical formulas, the melting point of these dyes tends to decrease, and when such dyes are used as dyes for thermal transfer sheets, thermal Even when heated for a very short time by a head etc., the heat transfer rate of the dye from the thermal transfer sheet to the transferred material is L”y? - It has been found that the present invention provides images with excellent fastness, particularly excellent storage stability and light fastness.

cyanoacetyl falling into formula (I),
Even if it is f-dye, the molecule! In the case of a dye having an Iso of less than 300, the color development rate of 4 degrees etc. was satisfactory, but the storage stability and light fastness of the formed image were poor.

In addition, preferred dyes listed in )-- include methyl ethyl ketone, toluene, ethanol, and
The solubility in general-purpose organic solvents such as isopropyl alcohol, cyclohexanone, ethyl acetate, etc. or mixed solvents thereof is significantly improved, and the dye is in a non-crystalline state or in a low crystal state in the dye-carrying layer formed on the thermal transfer sheet. As in the case of conventional dyes,
Significantly less heat 1 compared to the highly crystalline state of existence
11. There was a dye t1 that could easily transfer heat to the transfer material.

Below, the I and body sides of dyes suitable for the present invention are listed in F. Table 1 below shows the substitution J^R in formula (I)
1 Noshin R, and n represent.

(Margin below) 1st no. No, R, n R2R.

I HI C, 115C2+140112
f:l I C21f5C21140ph
3 C1132C211,021LllcI+34
0f':11. 2 C,115G2114
NIlso□C11351so-C, 151C113C
1l.

6 n-(:, 119I Ca1l!17
C811,.

7 0C211S 2 Czl14CN
Gzll, +(:N8 NIIGOCH32C113
f': 1139 HI C811+7 to 81
11710 C2H52(:, IIs
C2114011111C21151C2115C,l
+512 11r I G2115
G2+1401113 C0NIICI+3
1 Cl11C21+4f)l+14 CI
+, 1 [:2115G211. OR14
CI+31 C211,, C2114NllSO□
C11316CI+31 C211! ,
C2115170C2I+51 C2115C2
11,011(A) b in (1) to 117) above, where X is phenyl.

(II) I-Note (1) In Hata (17), X is 4
- is bromphenyl.

(G) In l- (1) to '+j (17), X is diphenyl.

(1)), Lki (1) no'ill? ), X is 4
-Methylphenyl.

(1→ I-In (1) to (17), X is 3-chloro-4-methoxyphenyl.

(F) x in J-ki (1) no j (+7)
/, 13-methyl-4-hydroxyphenyl.

([;) In the above (+) noshin (17), X is 4-nitrophenyl.

(11) In the above (1) to (17), X is 3-aminophenyl.

(]) In L (1) to (17), X is of the following formula ^h (or (:, II9, (: l + 3) (, I) In the above (1) to (17), X is of the following formula C,, u
□C1(3 (K) In (1) to (17) above, X is naphthyl.

(L)” - Note (1) In Hata (17), X is Fran-
Something that is 2.

(-) In (1) and (17), X is 3-nitrofuran-2.

(N) written (+) in Hata (17)
Something that is 2.

(0), 1: In (+) Group (+7), X is tochlorphenyl.

CP) In the above (1) to (17), X is 3-methylphenyl.

Dyes as comparative examples are illustrated below.

No, R,n R,R,,X I H1ell, e113ph2 Hl
211. , ell, ph3
Hl[:,,115C2115phThe thermal transfer sheet of the present invention is characterized by using the above-mentioned specific dye as shown below, and other than that, the structure may be the same as that of a conventionally known thermal transfer sheet.

The J^ material sheet used in constructing the thermal transfer sheet of the present invention containing the above-mentioned dye may be any conventionally known material having a certain degree of heat resistance and strength, for example, 0.5 to 50 μm, Preferably, JI) paper, polyester film, polystyrene film, polypropylene film, polysulfone film, polycarbonate film, polyvinyl alcohol film, cellophane, etc. with a diameter of about 3 to 10 μm are particularly preferred. The material is polyester film.

The dye p1 supporting layer provided on the surface of the J and C material sheets as described in "1" is a layer in which the dye of formula (1) is supported by an arbitrary binder resin.

As the binder resin for holding the dye of 11r1, any conventionally known binder resin can be used, and preferred examples include ethylcellulose, hydroxyethylcellulose, ethylhydroxycellulose, hydroxypropylcellulose, methylcellulose, and acetic acid. Cellulose, cellulose resins such as cellulose acetate butyrate, polyvinyl alcohol, polyvinyl acetate, polyvinyl acetal, polyvinyl butyral, polyvinylpyrrolidone,
Examples include vinyl resins such as polyacrylamide, and among these, polyvinyl acetal and polyvinyl butyral are particularly preferred from the viewpoint of heat resistance and dye transferability.

The dye-carrying layer of the thermal transfer sheet of the present invention is basically formed from the above-mentioned materials, but may also contain various conventionally known additives as required.

Such a dye-supporting layer is preferably prepared by adding Moeki's dye, a binder resin, and other optional components to a suitable solvent and dissolving or dispersing each component to prepare a coating liquid or ink for forming a support layer. It is formed by coating and drying on the above base sheet.

The support layer formed in this way has a thickness of 0.2 to 5.0 μm.
m, preferably 0,4 J') 11% 2,0
The thickness of the support layer is about 111 μm, and the dye shown in 111 in the support layer has a thickness of about 701
, preferably 10 to 1+1%.

The thermal transfer sheet of the present invention as described in Section i is useful for thermal transfer as it is for 1 minute, or it has an anti-adhesion layer on the surface of the dye-carrying layer, that is, +i! A mold layer may be provided, and by providing such a layer, it is possible to prevent adhesion between the thermal transfer sheet and the transfer material during thermal transfer, use the highest thermal transfer temperature ever, and create an image with excellent density. can be formed.

As this release layer,! Even just attaching anti-adhesive inorganic powder to ... has a considerable effect; ,
Preferably, it can be formed by providing a female layer with a thickness of 0.05 to 2 μm.

Incidentally, the above-mentioned inorganic powder or mold-releasing polymer exhibits a sufficient effect even when included in the dye-carrying layer.

Furthermore, such a hot turn'! A heat-resistant layer may be provided on the back side of the f-sheet in order to prevent adverse effects caused by the heat of the thermal head.

The transfer material used to form an image using the thermal transfer sheet as described above may be any material as long as its recording surface has dye receptivity to the dye on the surface. If the material is paper, metal, glass, synthetic resin, etc. that does not have any properties, a dye-receiving layer may be formed on at least one surface thereof.

Examples of transfer materials that do not require the formation of a dye-receiving layer include polyolefin resins such as polyethylene and polypropylene, halogenated polymers such as polyvinyl chloride and polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetate, and polyacrylic ester. vinyl polymers such as, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polycyanoacetyl resins,
Polyamide resins, resins made from olefins such as ethylene and propylene and other vinyl monomers, ionomers, cellulose resins such as cellulose diacetate and cellulose triacetate, fibers made of polycarbonate, polysulfone, polyimide, etc. Examples include films, sheets, molded products, etc.

Particularly preferred are sheets or films made of polyester, or processed paper provided with a polyester layer. In addition, even if the transfer material is non-dyeable such as paper, metal, glass, etc., the recording surface may be coated with a solution or dispersion of the dyeable resin as described above (r and dried, or By laminating these resin films, it can be used as a transfer material.

Historically, even if the transfer material described in item 1 has dyeability, a dye-receiving layer may be formed on its surface from a resin with good dyeability, as in the case of the paper described above. good.

The dye-receiving layer thus formed may be formed from a single material or from a plurality of materials, and may further contain various additives W11 within a range that does not interfere with the desired L1 target. Of course.

Such a dye-receiving layer may be of any thickness, but numerically has a thickness of 5 J' to 50 μm. Also, such a dye-receiving layer is preferably a continuous coating, or may be formed as a discontinuous coating using a resin emulsion or resin dispersion.

These transfer materials are basically as described above, and can they be used satisfactorily as they are? In this way, even if the temperature during thermal transfer is increased, adhesion between the thermal transfer sheet and the material to be transferred can be prevented, and even more excellent thermal transfer can be performed. Particularly preferred is finely powdered silica.

Further, in place of or in combination with the above-mentioned inorganic powder such as silica, a resin having good mold releasability as described in 11η may be added. Particularly preferred release polymers include cured products of silicone compounds, such as cured products of epoxy-modified P1 silicone oil and amino-modified silicone oil. Such a mold release agent may be used in a dye-receiving layer of about 0.001 star.
A proportion of 5 to 30% by weight is good.

In addition, the transfer material used may have an inorganic powder as described above added to the surface of the dye-receiving layer to enhance the anti-adhesive effect, or may have an excellent S-type property as described above. A layer consisting of a mold release agent may also be provided.

Such a +ii1 hex layer exhibits a partial effect at a thickness of approximately 0.01 to 5 μm, preventing adhesion to the dye receptive layer of the thermal transfer sheet while improving the dye receptivity of the − layer. can.

Any conventionally known means for applying thermal energy can be used as the means for applying thermal energy when performing thermal transfer using the thermal transfer sheet of the present invention as described above and the recording material as described above. For example, a thermal printer ( For example, by controlling the recording time using a recording device such as a thermal printer TN-5400 manufactured by Toshiba@,
00mJ/mrr? By using a certain amount of heat energy for several years, the desired goal of 1-1 can be fully achieved.

(Functions and Effects) According to the present invention as described in 2 below, as already partially explained, 1) the dye represented by the general formula (I) η used in the construction of the thermal transfer sheet of the present invention is different from that of the prior art. Compared to the Qi-raising dyes (molecular IA of about 150 to 250) used in thermal transfer sheets, it has a significantly higher molecular weight: Despite having an IK of 4F, it has a specific structure, and has a specific structure. Because it has a substituent at the position of It's not something to bleat out.

Therefore, since the image formed using the thermal transfer sheet of the present invention has excellent fastness, especially migration resistance and stain resistance, the sharpness of the formed image will not be lost even after long-term storage. There is no need to dye other articles, and the problems of the prior art are solved.

In particular, in the case of a dye having at least one polar group of R7 to R3 as the dye of the formula (I) in 11, the above-mentioned fastness becomes even more remarkable. This kind of excellent effect, which cannot be imagined with conventional technology, is especially noticeable when the dye-receiving part of the transferred material is made of a material such as polyester. It is also thought that it is fixed in the polyester by some action due to the correlation with the ester bond which is the group.

Next, reference examples, working examples, and comparative examples will be given to explain the present invention.
(I will explain it concretely. In addition, unless otherwise specified, parts or % in the text are +l, jit J^ quasi.

Reference Example 1 A cyanoacetyl dye represented by the following structural formula was obtained by coupling a compound represented by the following formula with cyanoacetylbenzene according to a conventional method.

Reference Examples 2 to 16 and Comparative Examples 1 to 3 In place of the N,N-dialkyl-p-phenylenediamine and cyanoacetyl coupler of Reference Example 1, the first
Using the compounds in the table, the other procedures were the same as in Reference Example 1, +if
The cyanoacetyl dyes listed in Table 1 were obtained. The dye of Reference Example 1 is also shown in Table 1.

Example An ink composition for forming a dye-carrying layer having the following composition was prepared and dried and applied to a 6 μm thick polyethylene terephthalate film whose back side was heat-resistant treated! '+t is f, og/rn
The thermal transfer sheets of the present invention and comparative examples were obtained by coating and drying so as to give the following properties.

Dyes from Table 1 3 parts Polyvinyl butyral resin 4.5 parts Methyl ethyl ketone 46.25 parts Toluene
46.25 copies Next, a synthetic paper (-FY-Yuka Co., Ltd., Yubo FPG #150) was used as a J construction material sheet, and on one side of the paper, a coating liquid having the following composition was applied at a dry rate of 10.0 g/ r
At the rate of r+' jp II7 L/, 3 at 100℃
After drying for 0 minutes, a transfer material was obtained.

Polyester resin (Vylon200, manufactured by Toyobo) 11
．． 5-part vinyl chloride/vinyl acetate combination (VYIII+, 1
1 (manufactured by:C) 50 parts, amino-modified silicone (NiF-:193, manufactured by I11 Etsu Kagaku Chogyo) 1
2-part epoxy-modified silicone (X-22-34: l, i; manufactured by Etsu Kagaku Kogyo) 1
．． 2 parts Methyl ethyl ketone/toluene/cyclohexanone (heavy h1 ratio 4:4:2) 102.0 parts The thermal transfer sheets of the present invention and comparative examples and the transfer material described above were combined with the respective dye-carrying layers and dye-receiving surfaces. were stacked facing each other, and recording was performed from the back side of the thermal transfer sheet using a thermal head under conditions of a head applied voltage tOV and a printing time of 4.0 m5ec, and the results shown in Table 2 below were obtained.

GJ 2 Mia 1 color J/F I, 'ゝ-'!
1 (8-1) 2.44 △
0 321 (8-2) 2
．． 00 ◎ Q 4
31.5 (8-3) 2.32
0 0 349 (A-4) 2
．． 01 0 0 428 (8-5)
2.44 0 0 319
(8-6) 1.60 0
0 529 (8-7) 2. +2
◎ 0 399 (8-
8) 2.38 △
0 334 (A-9) 1.83
◎ 0 473 (A-IQ) 2.32
0 0 349 (^-I+) 2J2
0 0 349 (A-12) 2.13
0 0 398 (A-1:]) 2.26
0 0364 (^-14) 2.38
△ 0135 (8-+5) 2.
08 ◎ 0 412 (
＾−161 2.44 △ 0
31q (11-1) 2.12 0
0400 (11-2) 1. old) ◎
Q 510.5 (n-:l) 2. old
◎ 0 428 (n-4) 1.69
◎ ○ 507 (11-5)
2.12 0 0398 (Row 8)
1.29 ◎ 0 6
08 (mouth) 1.80 ◎
0 478 (B-8) 2.
+17 ◎ 0 413 (G9)
1.51 ◎ ○ 552 (It-1
0) 2. Old ◎ 0 428 (n-++
) 2.01 ◎ 0 428 (B-1
2) +, aO◎ ○ 477 (tl
-13) 1.95 0 0 44
3(n-14) 2.07 ◎
0414(II-15) 1.71i
◎ Q4! I+ (11-16)
2.12 0 0 :l Q 8(C
-1) 2.1:I ○ O39
7(C-2) 1.69 ◎ ○
507.5 (C-3) 2.02
◎ 0 425 (C-4) 1.70
◎ 0 504 ([Knee 5)
2.1:I OO395 ((knee 6)
l, :10 ◎ 0605IC-7
) 1.82 ◎ 0 475 (C-
11) 2.08 ◎ Q
410 ((knee 9) +, 52 ◎
0549([”, -1o) 2.02
◎ 0425 (C-1t) 2.02
@ Q 425 ((Knee 12
) 1.82 ◎ 0 474
(C-13) 1.96 ◎ 0
440 (C-14) 2.08 ◎
Q 411E-1511,77◎ 0
488 (C-16) 2.1:] Q
O395(D-1) 2. :18
△ 0335 (D-2) 1.94
◎ 0 545.5 (D-312,
2700363 (D-4) 1.95 ◎ 04
42 (D-5) 2.38 △
0333 (D-6) 1.55 ◎
0 543 (1'1-7) 2.07
◎ 0 413 (D-8) 2.33
△ 0 348 (D-9) 1
．． 77 ◎ ○ 487 (D~10
)2.27 0 0 36:1 (D-
11) 2.27 0 0 363 (
D-! 2) 2.17 ◎ 0
4+2(D-11) 2.21 0
0 378 (D-14) 2. ':13
0 0 349 (D-15) 2.02
◎ 0 426 (D-16)
2.38 0 0 333 (+4-1)
2.18 0 0 185.5
([-2) 1.74 ◎ 0 4g
6(E-:l) 2.07 ◎ 0 4
13.5 (E-4) +, 75 ◎
Q 492.5 (li-5) 2.1
8 0 0 383.5 (E-6)
I, :15 ◎ 0 59:1.5(E
-7) lB57 ◎ 0
46:1.5 (E-8) 2.12 0
0 398.5 (E-9) 1.57
◎ ○ 537.5 (E-10)
2.07 ◎ 0 413.5
(G11) 2.07 ◎ Q 4
1:1. ! '1 (E-12) 1.87
◎ 0 462.5 (14-1:l)
3.53 ◎ Q 4211.
5 (li-14) 2.1200399.5 (1 knee 15
) 1.82 ◎ 0 476
．． 5 (1--1612, +8 0
0 38:1.5 (F-1) 2.32
0 0 351 (1”2) 1.8
8 ◎ Q 461.5 (F-3
) 2.00 Q Q
:]79 (1 le 4) 1.89 ◎
Q 458 (F-5) L32
△0349(F-)i) +,
48 ◎ 0559 (F-7)
1.80 ◎ 0 429 (F-8)
2.06 0 0
364-(F-9) 1.71
◎ 0 503 (1・-10) 2.00
0 0 379 (F-1112,000
0379 (F-12) 1.110 ◎ 042
8(1・〜I:1) 2.14 0 0
394 (T14) 2.06 0 0365
(F-15) 1.95 ◎ 0442
(G16) 2. :12 0 0 34
9 (G-1) 2.26 0 0
366 (G-2) l, 82 ◎
0 4765 (G-:l) 2.1:
] ○ Q: 194 (G-4)
1.83 ◎ 0 473
(G-5) 2.26 0 0
376 (G-6) 1.42 ◎
0574 (G-7) 1.93 ◎
0 444 (G-8) 2.19 0
0 379(1;-9) 1.65
@0 518 (G-10) 2
．． 13 0 0 394 (G-11)
2.1:l OO:l94(f;-12)
1.93 ◎ 0 443
(G-1:l) 2.08 0 0
409 (G-14) 2.19 0
0 3110 (G-+5) 1.89
◎ ○ 457 (G-+6)
2.26 0 0376 (I+-1)
2.38 0 0 3; 16 (II-
2) 1.94 ◎ 0 44
6.5 (II-3) 2.26 0 0
364 (11-4) 1.95 ◎
o443 (11-5) 2. :18
△ 0 334 (11-6) 1.
54 ◎ 0 544 (11-7)
2.06 ◎ 0 414 (11-
8) 2.12 0 0 349 (
11-9) 1.77 ◎ 0
488 (II-IQ) 2.26 0
0 364 (H-11) 2.26 0
0364 (11-12) 2.06 ◎
0413 (11-13) 2.20 0
0379 (II-14) 2.32 0
0 350 (II-15) 2.01
◎ ○ 427 (11-16)
2.38 0 0 :134(1-1)
1.86 ◎ 0464 (+-2)
! , 42 ◎ 0 574.5
(+-:]) 1.76 ◎ 0
492 (1-4) 1.4:] ◎
0 571 ([-5) 1.86
◎ 0 462 (+-6) 1.01
◎ 0 672 (1-7) I
, 56 ◎ 0542 (1-8)
1.82 Qo ○ 477
(+-9) 1.26 0 0616
(!-10) 1.76 ◎ 0
492 (1-11) 1.76 ◎
0 492 (1-12) 1.56
◎ 0 54+(1-1:l)! ,
6a) ◎ ○ 507 (1-14)
1.82 ◎ 0 478 (
1-15) 1.50 ◎ ○
555 (1-16) 1.86 ◎
0462 (J-1) 0.97
◎ 0688(,1-2) 0.5:l
◎ Q 7911.5 (J-3
) 0.86 ◎ 0716(J
-4) 0.54 ◎ 0795
(J-5) 0.97 ◎ 0
686 (J-7) O, l1fi ◎
0766 (J-8) 0.95
◎ 0 701 (J-10) 0.86
◎ 0 716 (J-11)
0.86 ◎ 0 716 (J-12
) 0.66 ◎ 0765 (J-Ml
) 0.80 ◎ 0731 (J-14
) 0.95 ◎ 0702 (J-1
5) Q, 60 ◎ 0 779 (
,1-16) 0.97 ◎ 0
686 (K-1) 2.24 0 0
:]71(K-2) 1.81 ◎
Q 478.5 (ni-3) 2.1
2 0 0 :]99(ni-4)
1.82 ◎ 0478 (K-5)
2.24 0 0 369 (K-6)
1.40 ◎ 0576 (Nizu) 1
．． 92 ◎ 0449 (K-8) 2
．． 18 0 0 384 (ni-9)
L63 ◎ 0 523 (ni-10)
2.12 0 0399 (K-11) 1
．． 12 0 0 399 (ni-12) 1
．． 92 ◎ 0448 (K-13) 2
．． 07 0 0 414 (ni-14) 2
．． 18 0 0 385 (ni-15)
1.87 ◎ 0 462 (ni-16)
2.24 0 0 369゛(1,-1
) 2.48 △ 0 311
(+, -2) 2.04 ◎ 0
421.5 (1, -3) 2゜36 △
0339 (+, -4) 2.05
◎ 0 418 (L-5) 2.48
△ 0309 (+, -6) l
, 64 ◎ 0 519 (+, -7)
2.16 0 0389 (1-8)
2.42 △ 0 324 (
1, -9) 1.8.7 ◎ 0
463 (+, -IO) 2,16 0
0339 (+, -II) 2. :18 0
0399 (L-12) 2.16 0
0 388 (+, -1:l) 2. :1
0 0 0: 153 (+, -14
) 2.42 8 0 325
(+, -15) 2.11 ◎
0 402 (+, -+6) 2.48
△ 0309 (Lock-1) 1.84
◎ 0471 (M-2) 1.40
◎ Q 581.5 (M-:])
1.72 ◎ 0499 (M-4)
1,41 ◎ 0 578 (
M-5) 1.84 ◎ 046
9 (M-6) 1.00 ◎ 0
679 (M-7) 1.52 ◎
0 549 (M-8) 1.78
◎ 0 484 (M-9) 1.23
◎ 0623 (M-1o) 1.
72 ◎ 0 499 (M-11)
1.72 ◎ 0 499 (M
-12) 1.52 ◎ 0
548 (M-1:l) 1.66 ◎
0 514 (M-14) 1.78
◎ 0485 (M-15) 1.4
7 ◎ 0 562 (M-+6)
1.84 ◎ 0 469 (N-
1) 2.28 0 0 361
(N-2) 1.84 ◎ Q
471.5 (N-3) 2.16
0 0 389 (N-4) 1.85
◎ 0468 (N-5) 2.
28 0 0 358 (N-6)
1.44 ◎ 0・569(N-
7) 1.96 ◎ 0439(
N-11) 2.22 0 0
374 (N-!l) +, 67 ◎
0 513 (N-10) 2.16
0 0 389 (N-11) 2.16
Q ○ 389 (N-12)
1. ! 16 ◎ 0 438 (
N-13) 2. lQ O○ 404(
N-th) 2.22 0 0375 (N-1
5) 1.91 ◎ ○ 4
52 (N-1fi) 2.28 0
0 359 (0-14) 2.24
0 0 369.5 (0-+5) 1. !
10 ◎ 0 446.5 (0-16
) 2.29 △ ○ 35
3.5 (0-17) 2. +1 0
Q 399.5 (11-14) 2. :1
5 0 0 149 (11-15) 1
．． 98 ◎ 0 426 (1”-16
) 2.41 △ 0 41
341 (P-17) 2.21 0' 0
379 (comparative example) 1 1,: 19 x Q2 1.
44 X ○3 1.50
x ○ The hues of the dyes in the above table are all red.

Note that the color density in 11 is a value measured with a densitometer RD-918 manufactured by McHess, USA.

In terms of storage stability, the sharpness of the recorded image did not change after being left in an atmosphere at 50°C for a long time, and the surface was coated with Pt15. ◎ indicates that the blank paper is not colored, ○ indicates that the sharpness is slightly lost and the white paper is slightly colored, △ indicates that the sharpness is lost and the blank paper is colored, and the image is unclear. Therefore, cases where the white paper was markedly colored were marked with an x.

Light resistance is according to JIS L, 0842.
Initial fastness in the second exposure method of 0841 or 3 binding tools”-
Those that were grade 3 were graded ◎, those that were grade 3 were graded O, and those that were lower than that were graded x.

Patent applicant: Dai Nippon Printing Co., Ltd.

Claims (4)

[Claims] (1) Consists of a base sheet and a dye-supporting layer formed on one side of the base sheet, and the dye included in the dye-supporting layer is a dye represented by the following general formula (I). A thermal transfer sheet featuring ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) (However, R_1 in the above formula is a hydrogen atom, a halogen atom,
Represents a substituent such as an alkyl group, aryl group, cycloalkyl group, arylalkyl group, alkoxy group, acylamino group, or aminocarbonyl group that may have a substituent, and n
represents 1 or 2, R_2 and R_3 represent an alkyl group or a substituted alkyl group, and R_2 and R_3 may be taken together to form a ring. X represents a substituted or unsubstituted phenyl group, naphthyl group, furan group or coumaron group. ) (2) The thermal transfer sheet according to claim (1), wherein the dye has a molecular weight of 350 or more. (3) The thermal transfer sheet according to claim (1), wherein the dye has a molecular weight of 380 or more. (4) At least one of the substituents of R_1 to R_3 and alkoxy group, phenyl group,
The thermal transfer sheet according to claim (1), which is a group having a polar group such as a cycloalkyl group, a halogen atom, or a nitro group.