JPS63182193A - Dye for thermal transfer recording and 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 (Field of Industrial Application) The present invention relates to a transfer sheet used for sublimation type thermal transfer recording.

(Prior technology) Conventionally, the technology for color recording facsimile printers, copying machines, and television images has been reversed, and electrophotography,
Color recording technologies using inkjet, thermal transfer, etc. are being considered.

The thermal transfer recording method is easy to maintain and operate the device! 4
! This method is considered advantageous compared to other methods because the replacement parts and consumables are inexpensive.

The thermal transfer method includes a bath melting method in which a transfer sheet in which a heat-melting ink layer is formed on a base film is heated by a heat-sensitive head to bath-melt the ink and transfer it onto a recording medium; There is a transfer sheeter in which an ink layer containing an umbrella dye is formed on a base film, and a sublimation method in which the dye is sublimated by heating with a thermal head and transferred and recorded onto the recording medium. Since the amount of sublimation transfer of the dye can be controlled by changing the energy applied to the head, gradation recording becomes easier, and this is considered to be particularly advantageous for full-color recording.

In thermal transfer recording using the sublimation method, the sublimable dye used in the transfer sheet is extremely important because it has a significant influence on the speed of transfer recording, the image quality of the recorded material, and the storage stability. It is necessary to meet the requirements.

■ Easily sublimated under the operating conditions of the thermal recording head.

■Do not thermally decompose under the operating conditions of the thermal recording head.

■ It must have a favorable hue in terms of color reproduction.

■ The molecular extinction coefficient is extremely high.

■ Stable against heat, light, humidity, amount of thread, etc.

■ Easy to synthesize.

■ Excellent suitability for ink production.

■ No safety and health problems.

A dye that satisfies all of the above conditions dd has not yet been found, and yellow dyes in particular have various drawbacks and have not yet been found to be satisfactory.

(Problem to be Solved by the Invention 2) The present invention is a thermal transfer sheet characterized by using a yellow dye that satisfies all of the above conditions. an optionally substituted aralkyloxyalkyl group, an optionally substituted aryloxyalkyl group, an optionally substituted aryloxyalkyl group, a tetrahydrofurfuryl group, a furfuryl group, a cycloalkyl group, an allyl group or an aralkyl group; The gist of the invention is a heat-sensitive transfer sheet characterized by having a coloring material layer containing a quinophthalone dye represented by Horiwasu.

The quinophthalone dye represented by the general formula CD used in the present invention will be explained.

The alkyl group for R in the above CII formula may be linear or branched. -c12 alkyl group is mentioned.

Examples of the optionally substituted alkoxyalkyl group include 11 methoxyethyl group, 2 ethoxyethyl group, -1(n
) propoxyethyl group, ni (18o) propoxyethyl group, -1 (n) butoxyethyl group, -1 (igo)
Butoxyethyl group, -1 (sea) butoxyethyl group,
J-(n) pentyloxyethyl group, -1(n) hexyloxyethyl group, ni(n) octyloxyethyl group, ni(-1ethylhexyloxy)ethyl group, /-methyl-1-butoxyethyl group , l-methyl-niethoxyethyl group, /-methyl-(n, 1 propoxyethyl group, /-methyl-, l-(180) propoxyethyl group, /-methyl-!-(n) butoxyethyl group, /-
Methyl-co-(iso)butoxyethyl group, /-methyl-! -(n)hexyloxyethyl group, /-methyl-=
Examples include -(-monoethylhexyloxy)ethyl group, 3-methoxybutyl group, 3-ethoxybutyl group, /-ethyl-nimethoxyethyl group, /-ethyl-coethoxyethyl group, but in particular C3-08 A β-alkoxyethyl group is preferred.

Examples of the optionally substituted aralkyloxyalkyl group include nipendyloxyethyl group, /-methyl-penzyloxyethyl group, /-ethyl-nipenzyloxyethyl group, nipendyloxyethyl group Examples include ethyl group.

Examples of the allyloxyalkyl group which may be substituted include a ni-allyloxyethyl group, a l-methyl-niallyloxyethyl group, and a l-ethyl-noallyloxyethyl group.

Examples of the optionally substituted aryloxyalkyl group include a no-phenoxyethyl group, a /-methyl-phenoxyethyl group, an i-:r-thyl-λ-phenoxyethyl group, and the like.

Examples of the cycloalkyl group include a cyclopentyl group and a cyclohexyl group.

The aralkyl group may be a benzyl group or a -benzyl group.

The dye used in the heat-sensitive transfer sheet of the present invention can be produced by the known method described in, for example, Japanese Patent Application Laid-Open No. 2003-110013.

When applying the above dye to the thermal transfer sheet of the present invention,
An ink is prepared by dissolving or dispersing a pigment in the form of fine particles in a medium together with a binder, and the ink is applied onto a base film and dried to form a color material layer on the base film.

Binders for ink preparation include water-soluble resins such as cellulose, acrylic acid, and starch, acrylic resin, methacrylic resin, polystyrene, polycarbonate, polysulfone, polyether sulfone, polyvinyl butyral, ethyl cellulose, and acetyl cellulose. Examples include organic bath agents and water-soluble resins.

In addition to water, media for ink preparation include alcohols such as methyl alcohol, isopropyl alcohol, and isobutyl alcohol, cellomelfs such as methyl cellosolve and ethyl cellosolvenato, aromatics such as toluene, xylene, and chlorobenzene, ethyl acetate, and acetic acid. Esters such as butyl, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, chlorine esters such as methylene chloride, chloroform, and trichloroethylene, ethers such as tetrahydro7rane, dioxane, N,N-dimethylformamide, Organic solvents such as N-methylpyrrolidone may be mentioned.

In addition to the above ingredients, the above ink contains organic and inorganic non-sublimable fine particles, dispersants, antistatic agents, anti-blocking agents, antifoaming agents, antioxidants, viscosity modifiers, etc. as necessary. Can be added.

Suitable base films for applying ink for making transfer sheets include thin paper such as condenser paper and glassine paper, and plastic films with good heat resistance such as polyester, polycarbonate, polyamide, polyimide, and polyaramid. , their thickness is 3~! A range of 0 μm can be mentioned.

Among the above base films, polyethylene terephthalate film is particularly advantageous in terms of mechanical strength, solvent resistance, economic efficiency, etc. However, this film does not necessarily have sufficient heat resistance and the running properties of the thermal head are insufficient. Therefore, by providing a layer of heat-resistant resin containing a surfactant, highly slippery heat-resistant particles, etc. on the partition surface of the coloring material layer,
The running performance of the thermal head can be improved.

The ink can be applied to the base film using a reverse roll coater, gravure coater, rod coater, air doctor coater, etc. The thickness of the ink coating layer after drying is 0.1~ Just apply it so that it has an a-concavity of 3 μm (Harasaki Danji, Makisoten/
? 1979, F-Noting Method”).

(Examples) The present invention will be specifically explained below with reference to Examples, but these Examples do not limit the present invention.

Example 1 a Preparation of ink The above quinophthalone dye of the present invention/Og cellulose acetate iog (manufactured by Daicel Chemical Co., Ltd., L
-,7<7) Total 1009
A warm mixture having the above composition was treated with a paint conditioner for io minutes to prepare an ink.

b) Preparation of transfer sheet The above ink was applied to a polyethylene terephthalate film (6 μm
A transfer sheet was obtained by dropping the cloth on top of the transfer sheet and drying (dry film thickness of about 1 μm).

In addition, the heat-resistant lubricity treatment of the polyethylene terephthalate film is carried out by adding 1 part by weight of a polycarbonate resin having a repeating structural unit shown by the following formula to the polyethylene terephthalate film, a phosphoric acid ester surfactant /'' -CoOIB (product of Ni-Daichi Kogyo Seiyaku Co., Ltd.), toluene/parts by weight was applied and dried (dry g & film thickness of approximately 0, rμm).

Creation of image receptor Saturated polyester resin (product name: TP-CO20, Nippon Gosei Co., Ltd. product) io part, amine-modified silicone (product name: KF, ??, 7, Shin-Etsu Chemical Co., Ltd. product) 0
．． 2 parts of methyl ethyl ketone, 773 parts of methyl ethyl ketone, and 1 part of xylene were dropped onto synthetic paper (product name: Yubo FPG/jO5 Oji Yuka Co., Ltd. Product 2) with a wire bar, dried on a dry bed to a film thickness of about 5 μm, and then A receiving casing was produced by heat-treating it in an oven at io0° C. for three parts.

Transfer recording The ink-stained side of the above transfer sheet is placed on the recording medium and recorded using a thermal head under the following conditions, with a clear yellow color.
A record of 69 uniform color densities could be obtained.

Main scanning and sub-scanning line density: dot/1rIL recording
Power: 20 W/Dot head heating time: 10 mf3 (3-part color saturation was measured using a densitometer TR-9=7 model manufactured by Macbeth, USA).

A light resistance test of the obtained record was carried out using a carbon arc fade meter (manufactured by Suga Teikokuki Co., Ltd.) (black panel temperature 63±-℃), but after irradiation for a long time the color changed and faded. I didn't. Furthermore, the transfer sheet and the recording were stable against heat and moisture, and had excellent storage stability in the dark.

EXAMPLE J1. Using the dyes shown in Table 1 instead of the dyes used in Example 1. As a result of preparing ink, preparing a transfer sheet, and carrying out transfer recording in the same manner as in Example IM, it was possible to obtain clear yellow recordings with the color densities shown in Table 1.

The results of the light fastness test of the obtained record and the dark storage stability test of the transfer sheet/record were good.

Table 1 *Measurement values in acetone*Measurement values in acetone (actions and effects of the invention) Because the quinophthalone dye represented by CI] used in the heat-sensitive transfer sheet of the present invention has a clear yellow color. When combined with appropriate magenta and cyan colors, it is suitable for obtaining full-color recording with good color reproducibility.Also, it sublimes easily and has a large molecular extinction coefficient, so it does not place a large burden on the thermal head. It is possible to obtain high-speed recording with high color density. Furthermore, since it is stable against heat, light, moisture, industrial products, etc., it does not undergo thermal decomposition during transfer recording, and the obtained recording has excellent storage stability, and is particularly excellent in light resistance. In addition, since the pigment has good solubility in organic solvents and dispersibility in water, it is easy to prepare a highly concentrated ink that is uniformly dissolved or dispersed. It is possible to obtain a heat-sensitive transfer sheet Y coated uniformly and at a high concentration. There are also no health and safety issues. Therefore, by using these heat-sensitive transfer sheets, recording with good uniformity and color density can be obtained.

Furthermore, the heat-sensitive transfer sheet of the present invention can utilize not only a heat-sensitive head but also infrared rays, laser light, etc. as a heating means.

Patent applicant: Mitsubishi Chemical Industries, Ltd. Representative patent attorney for long diameter - (7 others)

Claims (1)

[Claims] There is the following general formula [I] ▲mathematical formula, chemical formula, table, etc. on the base film▼・・・・・・・・・
...[I] (wherein, X is a hydrogen atom, a halogen atom, R is an alkyl group, an optionally substituted alkoxyalkyl group, an optionally substituted aralkyloxyalkyl group, an optionally substituted having a coloring material layer containing a quinophthalone dye represented by an allyloxyalkyl group, an optionally substituted aryloxyalkyl group, a tetrahydrofurfuryl group, a furfuryl group, a cycloalkyl group, an allyl group, or an aralkyl group. A heat-sensitive transfer sheet featuring: