JPS63178080A - Thermal transfer color sheet and thermal transfer method - Google Patents

Abstract

PURPOSE:To enhance the contrast of an image, by incorporating a magenta dye and a cyan dye in an yellow ink layer and incorporating a yellow dye and the cyan dye in a magenta ink layer and incorporating the yellow dye and the magenta dye in a cyan ink layer. CONSTITUTION:When the optical densities of the yellow dye, magenta dye and cyan dye in a transfer recording image are respectively set to Y, M, C, the magenta dye and the cyan dye are contained in an yellow ink layer so that the relation between the optical densities of the dyes in the image obtained by thermally transferring yellow ink alone becomes Y>M and Y>C. The yellow dye and the cyan dye are contained in a magenta ink layer so that the relation between the optical densities of the dyes in the image obtained by thermally transferring magenta ink alone becomes M>Y and M>C. Further, the yellow dye and the magenta dye are contained in a cyan ink layer so that the relation between the optical densities of the dyes in the image obtained by thermally transferring cyan ink alone becomes C>Y and C>M. This thermal transfer color sheet is used in combination with a transparent film as a material to be recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a color sheet for thermal transfer, and particularly to a color sheet for thermal transfer and its thermal transfer color sheet suitable for obtaining recorded images with excellent contrast in a full-color printer. Regarding the method.

[Conventional technology]

For thermal transfer color sheets, for example, Japanese Patent Application Laid-Open No. 59-129
As described in Japanese Patent Application No. 195, there is a melting type that utilizes the phenomenon of melting of ink provided on a substrate due to heat, and as described in Japanese Patent Application Laid-open No. 1983-229787, a method that utilizes the melting phenomenon of dyes in the ink. There are sublimation types that utilize the sublimation phenomenon caused by heat. Usually they are yellow, magenta, and cyan.
Ink layers of primary colors are sequentially arranged on the substrate in the order of surface I, and a heating element such as a thermal head is heated based on the image signal to thermally transfer colors onto the recording material in the order of yellow, magenta, and cyan. You can obtain a color image by doing this.

Conventional color sheets for thermal transfer, as typified by the above example, have only one type of yellow dye in the yellow ink layer and one type of dye in the magenta ink layer, as described in JP-A No. 60-49993. In the magenta dye, the cyan ink layer contains only one type of cyan dye, or as described in JP-A No. 59-96993, the yellow ink layer contains none of the cyan dyes. The yellow ink layer contains a 2PM dye that is yellow, two dyes that are both magenta in the magenta ink layer, and two types of dyes that are both cyan in the cyan ink layer. The ink layer contains only a yellow dye, the magenta ink layer contains only a magenta dye, and the cyan ink layer contains only a cyan dye.

[Problem that the invention seeks to solve]

However, all of these have the problem that the contrast of the recorded image is low. In particular, images recorded on transparent films by conventional thermal transfer color sheets are
When the image was projected onto a screen using ``or'', there was a problem in that the image was pale and had low contrast.

An object of the present invention is to provide a color sheet for thermal transfer, in which a clear color recording image with good contrast can be obtained by sequentially transferring yellow, magenta, and cyan ink layers. It is in. In particular, it is an object of the present invention to provide a thermal transfer method for obtaining a recorded image with good contrast that is sufficiently compatible with OHP by using the thermal transfer color sheet of the present invention.

[Means for solving problems]

To summarize the present invention, the first aspect of the present invention relates to a color sheet for thermal transfer.
In a thermal transfer color sheet in which colored ink layers are arranged, the yellow pigment in the transferred recorded image is obtained on the recording material by overlapping the thermal transfer color sheet and the recording material and heating from the thermal transfer color sheet side. , the optical 1a degrees of magenta and cyan dyes are Y and M, respectively.

C, in the yellow ink layer so that the optical density relationships of the yellow dye, magenta dye, and cyan dye in the image obtained when yellow ink is thermally transferred alone are Y>M, Y>C. The magenta ink contains a magenta dye and a cyan dye, and the relationship between the optical densities of the yellow dye, magenta dye, and cyan dye in the image obtained when magenta ink is thermally transferred alone is M>Y, M>C. The ink layer contains a yellow dye and a cyan dye, and the relationship between the optical densities of the yellow dye, magenta dye, and cyan dye in the image obtained when the cyan ink is thermally transferred alone is C>Y, C>M. It is characterized in that the cyan ink layer contains a yellow dye and a magenta dye.

(9) The second invention of the present invention relates to a thermal transfer method, and is characterized in that the color sheet for thermal transfer of the first invention and a transparent film as a recording material are used in combination.

The purpose is to provide a color sheet for thermal transfer in which three color ink layers each containing a yellow dye, a magenta dye, and a cyan dye are arranged. This is achieved by containing a cyan dye, and a yellow dye and a magenta dye in the cyan ink layer. In addition, especially by using such a color sheet for thermal transfer, it is possible to obtain a recorded image that is clear and has good contrast that is sufficiently compatible with OHP.

Hereinafter, the present invention will be specifically explained based on the accompanying drawings.

FIG. 1 is a sectional view showing an example of the structure of a color sheet for thermal transfer according to the present invention when recording is performed using a thermal head, and FIG.
The figure is a sectional view of an example of a color sheet for thermal transfer.

In each figure, numeral 1 is a staking-resistant layer, 2 is a substrate, 3 is a yellow dye, 4 is a magenta dye, 5 is a cyan dye, 6 is an ink layer, 7 is a color sheet for thermal transfer, 8 is a recording material, 9 10 means a yellow ink layer, 10 means a magenta ink layer, 11 means a cyan ink layer, and 12 means a thermal head.

As shown in FIG. 2, the color sheet for thermal transfer of the present invention has a yellow ink layer 9 on a substrate, a magenta ink layer of Ni 10,
, the cyan ink layer 11 is basically arranged in a plane-sequential manner, and the substrate (@1 Fig. 2) is made of, for example, polyethylene terephthalate film, polyimide film,
Polycarbonate film, acetate film, cellophane, condenser paper, etc. are used. In addition, to improve the heat resistance of the base and prevent sticking,
An anti-staking layer (FIG. 1) may be provided on the back side of the substrate. As the staking-resistant layer, for example, silicone resin, melamine resin, and other resins with high heat resistance are used.

Note that in FIG. 2, the yellow ink layer 9, the magenta ink layer 10, and the cyan ink layer 11 are arranged in this order.
The order of arrangement is not particularly limited to this, and for example, arranging in the order of yellow, cyan, and magenta, or even arranging in the order of magenta, cyan, and yellow will not impair the effects of the present invention. .

In thermal transfer recording, heat from a heating element such as a thermal head 12 is conducted to the ink layer 6 via the anti-sticking layer 1 and the substrate 2 of the ink sheet, and the heat melts the ink layer or causes damage to the ink layer. This is performed by transferring the dye contained in the trenches to the recording material 8 by sublimation, evaporation, or the like. The ink layer 6 is composed of at least a binder and a pigment, and examples of the binder include low melting point substances such as ester wax, paraffin wax, carnauba wax, higher fatty acid amides, low softening point resins, and mixtures thereof. In the sublimation type, resins with relatively high softening points such as polyamide, polyester, polycarbonate, polyvinyl butyral, and cellulose are used. Further, the yellow ink layer 9 contains a magenta dye 4 and a cyan dye 5 in addition to the yellow dye 3, the magenta ink 1 layer 10 contains a yellow dye 3 and a cyan dye 5 in addition to the magenta dye 4, and the cyan ink layer 11 contains: In addition to cyan dye 5, it contains yellow dye 3 and magenta dye 4. As a yellow dye, for example, V is used for sublimation type.
The sublimable dyes include C, ■.

[Color Index (, color Inde: c
)] Dispers a: yo - (Dispers
e Yellow ) -51,42,8,61,54
The dyes used in the melt type are C, 5olvent Yellow-34, 11, 8.
, 5, 14, etc. In addition, as a magenta dye, for example, a sublimable dye such as C, 1, Disperse Red (
Red)-60, 13, 22, 132, 41, etc., and dyes used in the melting type include l-j, C,1, Solvent Red-2, 16, 19, 27, etc. Cabinet,
As cyan dyes, for example, sublimable dyes include C,1,
Disperse Blue (Blue)-5,19,5
There are dyes such as 80, 62, 71, etc., and the dyes used in the melt type are C, Solvent Blue-2, 5, 19, 26.
, 33 etc. However, it is not particularly limited to these.

When the minimum value of the reflectance or transmittance of the reflection spectrum or transmission spectrum of a recorded image in the wavelength range of 580 to 780 nm is A (%), the optical density can be calculated using the following formula: % formula % () Yellow dye, magenta dye, and cyan in the transferred recorded image f'R obtained on the recording material by overlapping the color sheet for thermal transfer and the recording material and heating from the heat transfer color sheet side. Assuming that the original characters of the pigments are Y, M, and C, respectively, the content of the yellow, magenta, and cyan pigments contained in each of the yellow, magenta, and cyan ink layers is as follows. Contain in amount.

More preferably, the yellow ink layer has [1L4Y≧
M, 0.4Y≧M, 0.4Y≧C, and the magenta ink layer contains 0.4M≧Y, 0.4Y≧C.
Each pigment is contained so that 4M≧C, and each pigment is contained in the cyan ink layer so that 0.4C≧Y1 α4C≧M. The content f12' of each dye in each of these ink layers indicates the optical density of each dye in the image after transfer.In the yellow ink layer, α1Y≧M, α1Y≧C1, and
1Y≧M≧102Y, α1Y≧C≧α02Y, [,0,4M≧Y in magenta ink layer.

0.1M≧01 history, α4M≧Y≧0.05M, α1M≧
C≧002M, and fi, 0.4C in the cyan ink layer
≧Y, 0.4Y≧M, 0.4C≧M, further 1c14c≧Y
≧(lLO5c, α4C≧M≧α05C) is more preferable.

An ink liquid is obtained by mixing a pigment having the composition as described above, a binder, and a solvent for dissolving or dispersing these, such as tetrahydrofuran, methyl ethyl ketone, acetate, etc., and the thus obtained yellow ink liquid, magenta ink liquid, Each of the cyan ink liquids was applied side by side onto the above-described substrate using a commonly used coating method such as a gravure coater, and then dried to prepare a color sheet for thermal transfer.

In addition, in the following example, the case of sublimation type thermal transfer recording that utilizes the phenomenon in which the dye in the ink layer sublimes due to heat is described, but it can also be applied to the case of melting type thermal transfer recording that utilizes the phenomenon of melting of ink due to heat. Similar to the sublimation type, clear color recorded images with good contrast can be obtained.

[Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.
The invention is not limited to these examples.

In addition, parts in each example mean parts by weight.

Example 1 Each yellow, magenta, and cyan ink liquid consisting of 2 parts of polyester resin (Vylon+290 Toyobo #), 1 part of sublimable dye, and 27 parts of tetrahydrofuran was coated with a heat-cured silicone resin (K) as a stain-resistant layer on one side.
The other side of the 6 μm thick polyester film is coated with a layer of S-772 (Shin-Etsu Silicone).
．． A color sheet for thermal transfer was prepared by applying the coating sequentially using a wire bar of 1M≧Y and 0.5wm and drying. However, the sublimable dye is BA8 F Lurafix 0.4Y≧M, 0.4Y≧M as a yellow dye. urafix) E-ZO
--142 (manufactured by BASF, C0 engineering, Tispers Yellow-3), as a magenta dye Kayaset R-B (manufactured by Nippon Kayaku, C', 1.Nrubento Red-146),
BASF Lurafix Blue as cyan dye -
660 (BA8F'6, c, r, Disperse Blue-3) was used.

The dye contained in the yellow ink liquid is yellow dye 10.
2 parts of magenta dye α and 2 parts of cyan dye α, and the dye contained in the magenta ink liquid is 1 part of magenta dye α.
0 parts of yellow dye, 2 parts of cyan dye α, and 1 part of cyan dye contained in the cyan ink liquid.
0 parts to 113 parts of yellow dye, 11 parts of magenta dye
It was divided into 4 parts.

On the other hand, a dyeing solution consisting of 20 parts of polyester resin (Vylon≠200, manufactured by Toyobo Co., Ltd.), toluene, and 64 parts of ethyl acetate was applied onto synthetic paper (Yubo FPG150, manufactured by Tamago Yuka Synthetic Paper Co., Ltd.) with a winding diameter of α4 mm. After coating with a wire bar, a recording material was prepared by drying.

Using the thus produced color sheet for thermal transfer, recording material, and a thermal head with a resistor element density of 6 pieces/parrot and a resistance value of 210Ω, a thermal spatula)-applied voltage of 7. When I printed yellow, magenta, and cyan inks in order using an Ov printer, I was able to obtain a color recorded image with good contrast.

Example 2 Polyester resin (Vylon ÷290, manufactured by Toyobo) 2
VA - yellow, magenta, and cyan inks g, t'' consisting of 1 part sublimable dye and 27 parts tetrahydrofuran
, onto the same polyester film as in Example 1, using a wire bar with a winding diameter of C1, 3+IIIK to apply the coating in a plane-sequential manner;
After drying, color sheet 11 for thermal transfer was prepared. however,
The sublimable dye is Kayaset Y-93 as a yellow dye.
7 (made by Nippon Karaku, C, 1, Disperse Yellow-1
6), magenta dye (BASF Lurafix Red)"-450 (BASF dye, C, 1, Disperse Red-60), cyan dye (Cayacera) B-1
56 (Nippon Kayaku, C, 1, Solvent Blue-36
) was used.

The dye contained in the yellow ink liquid is yellow dye 10.
1.3 parts of magenta dye and 1.4 parts of cyan dye per 10 parts of magenta dye, and 3 parts of yellow dye and 1 part of cyan dye per 10 parts of magenta dye
The dye '#+ contained in the cyan ink liquid was 10 parts of cyan dye, 3 parts of yellow dye, and 4 parts of magenta dye.

On the other hand, a dyeing solution consisting of 20 parts of polyester resin (Vylon ≠ 200, manufactured by Toyobo Co., Ltd.) and 80 parts of methyl ethyl ketone was applied onto a wire bar with a winding diameter of C4 on a transparent polyester film (Lumiror, Higashishizaki) with a thickness of 120 μm. After coating, a transparent film for recording was prepared.

The color sheet for thermal transfer thus produced, the transparent film for recording, and the resistor element density: 6 pieces/WIR1 resistance value: 21
Using a 0Ω thermal head and a printer with a thermal head applied voltage of 7.0 V, each ink of yellow, magenta, and cyan was recorded on J@, and then the recorded image was projected on a screen using an OHP. A clear image with good contrast was obtained.

Comparative Example 1 Yellow, magenta, and cyan ink liquids consisting of 2 parts of polyester resin (Vylon ÷ 290, manufactured by Toyobo), 1 part of sublimable dye, and 27 parts of tetrahydrofuran were used in Example 1.
．． A color sheet for heat transfer was prepared by coating the same polyester film as in No. 2 with a winding diameter of α5 wire (-) and drying to create a color sheet for thermal transfer. 937 (Nippon Kayakuri, C
,I.

7'Isverse Yellow-16), BA8F Lulafix Red-450 (BASF
Co., Ltd., C,1, Disperse Red-60), Kayacera as a cyan dye) B-136 (Nippon Kayaku, C,1,
The dye contained in the 0 yellow ink liquid using Solvent Blue-56) was only the yellow dye, the dye contained in the magenta ink liquid was only the magenta dye, and the dye contained in the cyan ink liquid was only the cyan dye.

10,000, a dyeing solution consisting of 20 parts of HolJ ester resin (Vylon+200, manufactured by Toyobo) and 80 parts of methyl ethyl ketone. A wire with a winding diameter of α4 m is placed on a transparent polyester film (Lumiror, manufactured by Toshi) with a total thickness of 120 μm. After coating with a bar, it was dried to produce a transparent film for recording.

The color sheet for thermal transfer, the transparent film for recording, and the resistor element density of 6 pieces/W and resistance value of 210Ω were thus made.
Using a thermal head of 7.
Printed on yellow, magenta, and cyan ink t-11111 using an Ov printer and printed at 7tf% OHP'i.
When the recorded image was projected onto a screen using a 3D printer, the image was pale and had low contrast.

〔Effect of the invention〕

As explained above, the color sheet for thermal transfer of the present invention contains a magenta dye and a cyan dye in the yellow ink layer, a yellow dye and a cyan dye in the magenta ink layer, and a yellow dye and a magenta dye in the cyan ink layer. Therefore, images obtained using the color sheet for thermal transfer of the present invention have extremely high contrast.

In particular, when an image recorded on a transparent film using the color sheet for thermal transfer of the present invention is projected onto a screen using an OHP, the contrast is significantly lower than when using a conventional color sheet for thermal transfer. A high-quality, clear image can be obtained, and it is very effective as a color sheet for feeding hot ducks to OHP sea 1" jp animals.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the structure of a color sheet for thermal transfer according to the present invention when recording is performed using a thermal head, and FIG.
The figure is a plan view of an example of a color sheet for thermal transfer according to the present invention. 1: Stakes-resistant layer, 2: Substrate, 6: Yellow dye, 4: Magenta dye, 5 Nidian dye, 6: Ink layer,
7: Color sheet for thermal transfer, 8: Recording material, 9: Yellow ink layer, 10: Magenta ink layer, 11 Nijian ink layer, 12: Thermal head patent applicant Hitachi Urasakushoma Co., Ltd. Nitto Electric Industries, Ltd.

Claims (1)

[Claims] 1. In a color sheet for thermal transfer in which ink layers of three colors each containing a yellow dye, a magenta dye, and a cyan dye are arranged on a substrate, the color sheet for thermal transfer and a recording material are overlapped, When the optical densities of the yellow dye, magenta dye, and cyan dye in the transferred recorded image obtained on the recording material by heating from the color sheet side for thermal transfer are Y, M, and C, respectively, the yellow ink alone The relationship between the optical density of the yellow dye, magenta dye, and cyan dye in the image obtained when thermal transfer is Y>M,
A yellow ink layer contains a magenta dye and a cyan dye so that Y>C, and the relationship between the optical densities of the yellow dye, magenta dye, and cyan dye in the image obtained when the magenta ink is thermally transferred alone is as follows. The magenta ink layer contains a yellow dye and a cyan dye so that M>Y, M>C, and the optical density of the yellow dye, magenta dye, and cyan dye in the image obtained when the cyan ink is thermally transferred alone. A color sheet for thermal transfer, characterized in that a cyan ink layer contains a yellow dye and a magenta dye so that the relationships C>Y and C>M. 2. The yellow ink layer is 0.4Y≧M, 0.4Y≧
C, the magenta ink layer contains a yellow dye and a cyan dye such that 0.4M≧Y, 0.4M≧C, and the cyan ink layer The color sheet for thermal transfer according to claim 1, which contains a yellow dye and a magenta dye so that 0.4C≧Y and 0.4C≧M. 3. The yellow ink layer is 0.1Y≧M, 0.1Y≧
C, the magenta ink layer contains a yellow dye and a cyan dye such that 0.1M≧Y, 0.1≧C, and the cyan ink layer contains: The color sheet for thermal transfer according to claim 2, which contains a yellow dye and a magenta dye so that 0.4C≧Y and 0.4C≧M. 4. The yellow ink layer is 0.1Y≧M≧0.02Y
, 0.1Y≧C≧0.02Y, and the magenta ink layer contains 0.4Y≧C≧0.02Y.
A yellow dye and a cyan dye are contained so that M≧Y≧0.05M, 0.1M≧C≧0.02M, and the cyan ink layer contains 0.4C≧Y≧0.05C, 0.4C≧ M≧
The color sheet for thermal transfer according to claim 3, which contains a yellow dye and a magenta dye so that the color density is 0.05C. 5. A color sheet for thermal transfer in which ink layers of three colors each containing a yellow dye, a magenta dye, and a cyan dye are arranged on a substrate, and the color sheet for thermal transfer and a recording material are overlapped to form a color sheet for thermal transfer. When the optical densities of the yellow dye, magenta dye, and cyan dye in the transferred recorded image obtained on the recording material by heating from the side are Y, M, and C, respectively, when the yellow ink is thermally transferred alone, The relationship between the optical densities of the yellow dye, magenta dye, and cyan dye in the resulting image is Y>M,
A yellow ink layer contains a magenta dye and a cyan dye so that Y>C, and the relationship between the optical densities of the yellow dye, magenta dye, and cyan dye in the image obtained when the magenta ink is thermally transferred alone is as follows. The magenta ink layer contains a yellow dye and a cyan dye so that M>Y, M>C, and the optical density of the yellow dye, magenta dye, and cyan dye in the image obtained when the cyan ink is thermally transferred alone. It is recommended to use a color sheet for thermal transfer containing a yellow dye and a magenta dye in the cyan ink layer in combination with a transparent film as a recording material so that the relationship is C>Y, C>M. Characteristic thermal transfer method.