JPS6122993A - Coloring matter for thermal transfer recording - Google Patents

Abstract

PURPOSE:To obtain coloring matter for a thermal transfer recording which is easily sublimated and has a desirable hue for color reproduction, and is stable to light, humidity, chemicals and etc. with excellent suitability to make ink by using a specific cyanic coloring matter. CONSTITUTION:Subject matter is a coloring matter of a clear cyanic color and is expressed by a formula; and a full color recording of an excellent color reproduction by combining a suitable magenta color and a yellow color is obtainable. And it is easily sublimated and a high density color recording at a high speed may be obtained due to its large atomic absorption factor. It is also excellent in preservation of the recording obtained. In the formula X indicates hydrogen atom, methyl group, methoxy group, formylamino group, acetylamino group, propionic amino group, chlorine atom, bromine atom, iodine atom or fluorine atom, and Y indicates hydrogen atom, methoxy group, ethoxy group, chlorine atom, bromine atom, iodine atom, fluorine atom or methyl group, R, R<1> and R<2> indicate hydrogen atom, alkyl group or allyl group of replaced or non- replaced C1-C3.

Description

[Detailed description of the invention] Purpose of invention Regarding pigments.

0) Conventional technology Conventional, Noah Axim printer. For copying machines, there is a need for technology to record television images, etc., and electrophotography,
Color recording technologies using inkjet, thermal transfer, etc. are being considered.

The thermal transfer recording method is considered to be advantageous over other methods because the device is easy to maintain and operate, and the device and consumables are inexpensive.

The thermal transfer method uses a transfer sheet with a heat-melting ink layer formed on a base film.

A melting method heats the ink using a thermal head to melt the ink and transfer it onto a recording medium.

There is a sublimation method in which a transfer sheet on which an ink layer containing a sublimable dye is formed on a base film is heated by a thermal head to sublimate the dye and transfer and record it onto a recording medium. Since the amount of dye sublimation transfer can be controlled by changing the energy applied to the thermal head, single-gradation recording is easy, and it is considered to be particularly advantageous for full-color recording.

C) Problems to be Solved by the Invention The present invention is characterized by: being easily sublimated under the operating conditions of a thermal recording head, not being thermally decomposed under the operating conditions of a thermal recording head, having a favorable hue for color reproduction, and absorbing 1 molecule of light. The coefficient is large b.

The object of the present invention is to provide a cyan dye that satisfies conditions such as being stable against light, moisture, and chemical forces, being easy to synthesize, and having excellent suitability for forming into an ink.

Structure of the Invention The present invention is based on the general formula [■] representing an amine group, a chlorine atom, a bromine atom, an iodine atom, or a fluorine atom, and Y represents a hydrogen atom, a methoxy group, an ethoxy group, a chlorine atom, a bromine atom, an iodine atom, or a fluorine atom. The gist is a dye for thermal transfer recording represented by the following formula: R1 R1 and R2 represent a hydrogen atom, a substituted or unsubstituted C0-08 alkyl group, or an aryl group.

The dye of the present invention comprises a phenol represented by the following general formula rlD HOOR (wherein R is the same as defined above) and a phenol represented by the following general formula [I[[) (wherein, X, Y, R1, R2 are the above-mentioned ) in the presence of silver nitrate.

It can be produced by heating.

A field for applying the dye of the present invention to the present recording method.

A transfer sheet may be prepared by dissolving or dispersing the dye in the form of fine particles in a medium together with a binding agent to prepare a y4 ink, applying the ink onto a base film, and drying it.

Binders for preparing ink include water-soluble resins such as cellulose, acrylic acid, and starch, acrylic resin, methacrylic resin, polystyrene, polycarbonate, and polysulfone.

Examples include resins soluble in organic solvents such as polyether sulfone and ethyl cellulose. In the case of an organic solvent-soluble resin, it is possible to use it not only as an organic solvent solution but also in the form of an aqueous dispersion.

Besides water as a medium for ink preparation.

Methyl alcohol, inbutyl alcohol.

Alcohols such as inbutyl alcohol, Cellosolve Q such as methyl selonulp and ethyl cellosolve, aromatics such as toluene, xylene, and chlorobenzene, esters such as ethyl acetate and butyl acetate, acetone, and methyl ethyl ketone. Ketones such as methyl isobutyl ketone and cyclohexanone, chlorinated solvents such as methylene chloride, chloroform, and trichloroethylene, ethers such as tetrahydrofuran and dioxane, organic solvents such as N,N-dimethylformamide, and N-merbitetraridone. can be mentioned.

Suitable base films for applying ink for producing transfer sheets include thin paper such as condenser paper and glassine paper, and films of plastics with good heat resistance such as polyester, polyamide, and polyimide. Moreover, the thickness of the base film is 3~! The range of θμm can be mentioned.

The method of applying ink to the base film can be carried out using a reverse roll coater, gravure coater, rod coater 1 air doctor coater, etc., and the thickness of the ink coating layer after drying is θ, /~! μm
(Yuji Maki, [Coating Method J (/97) Maki Shoten)].

Functions and Effects of the Invention Since the dye shown in the above [1-] of the present invention has a clear cyan color, it is possible to obtain a full-color record with good color reproducibility by combining it with appropriate magenta and yellow colors. Suitable for use.

Furthermore, since it is easily sublimed and has a large extinction coefficient per molecule, recording with high color density can be obtained at high speed without placing a large burden on the thermal head. Furthermore, since it is stable against heat, light, moisture, chemicals, etc., it does not undergo thermal decomposition during transfer recording, and the resulting recording has excellent storage stability. In addition, since the dye of the present invention has good solubility in organic solvents and good dispersibility in water treatment, it is easy to prepare a uniformly dissolved or dispersed ink with high concentration, and such ink can be used. In particular.

It is possible to obtain a transfer sheet on which the dye is applied uniformly and at a high degree. Therefore, by using these transfer sheets, it is possible to obtain records with excellent uniformity and color density.

EXAMPLES The present invention will be specifically explained with reference to Examples, but these Examples are not intended to limit the invention.

Examples/a) Preparation of ink The above dye /θ2 Polysulfone resin* /θ Total 1ooy * Manufactured by Nissan Chemical Industries, Ltd., Needel P-/70θ
(Product Name) A mixture having the above composition was treated with a paint conditioner for 70 minutes to prepare an ink. The pigment and resin were completely dissolved, and an ink with a uniform solution could be obtained.

b) Preparation of transfer sheet The above ink was coated with a bar coater (RE Pr1ntCoa
The film was coated on a polyimide film (1ttn thickness) manufactured by T Engineering Strumenta Co., Ltd. and then air-dried to obtain a transfer sheet. -C) Transfer Recording The ink-applied surface of the above transfer sheet was placed on a recording medium and recorded using a thermal head under the following conditions.

It was possible to obtain a record of a clear cyan color with a uniform and high color of 11&.

Recording conditions Linear density of main scanning and sub-scanning = Z dots / recording power:
Heating time of 0.6W/dot head: 10fn type The recording medium was an aqueous dispersion of saturated polyester jlits (manufactured by Toyo #M Co., Ltd.).

) Z Ironal MD-/Cooo, trade name) 10y and silica (manufactured by Nippon Silikani Gyo Co., Ltd.).

N1ps: LIB220 A, trade name)/f was mixed and prepared, and the prepared liquid was coated on high-quality paper (2θ0 μm thick) using a bar coater (RK Pr1nt Coat instrument).
It was manufactured by coating and drying using A3) manufactured by S Company.

Color density was measured using a densitometer RD manufactured by Macbeth, USA.
-j/4 was measured using a mold (filter Niratten Air).

A light resistance test of the obtained record was carried out using a carbon arc fade meter (manufactured by Suga Test Instruments Co., Ltd.) at a black panel temperature of 63 °C, but there was almost no discoloration or fading after irradiation for a long time. .

The dye used in this example was produced as follows.

Acetamide phenol 3.02 represented by the following structural formula and compound Da, 32 represented by the following structural formula were mixed in ethanol/J-Ot.
In addition to d, after stirring at room temperature, iron nitrate j, 4tf was added to water/
! An aqueous solution of - was added dropwise. Next, 2t% ammonia water/jyd was added, and silver nitrate IO0! Add dropwise an aqueous solution in which water is dissolved in 10@lK water, and heat to 30-4tO
The mixture was allowed to react for 3 hours. After the reaction was completed, it was extracted with RI00 form, the solvent was distilled off, and column purification was performed with chloroform.
Purified product of India/7-series pigment represented by the following structural formula j, -
21 (yield ♂θchi vs. theory) was obtained.

The melting point of the above dye is /2/~/30°C.

The maximum absorption wavelength (chloroform) was t j t nm.

Example λ Using the dyes shown in Table 1 instead of the dyes used in Example 1, ink preparation, transfer sheet production, and transfer recording were carried out according to the method of Example 1, and the results are shown in Table 7. We were able to obtain a record of a cyan bird with a clear color intensity as shown in the figure.

Procedural amendment (spontaneous) November 1920, I/L, Commissioner of the Japan Patent Office, 1. Indication of the case Showa J1 patent application No. 1≠322
R No. 2 Name of the invention: Dye for thermal transfer recording 3 Relationship with the person making the amendment Patent applicant (!ri 6) Mitsubishi Chemical Industries, Ltd. 4 Agent Address: 2-5-2 Marunouchi, Chiyoda-ku, Tokyo 100 0 or 1 person) 5 Subject of amendment ``Claims J and 1 6 Amendment. Detailed explanation of contents'' 0 Each column (1) The scope of claims will be corrected as shown in the attached sheet.

(2) Insert the following example into the table (first group) on page 31 of the specification.

Attachment ``Claims (1) General formula (1) (wherein, .

It represents an iodine atom or a fluorine atom, and Y is a hydrogen atom, a methoxy group, an ethoxy group, or a chlorine atom.

It represents a bromine atom, an iodine atom, a fluorine atom or a methyl group, and R, R1 and R2 represent a hydrogen atom, a substituted or unsubstituted 01-08 alkyl group or an aryl group. ) A dye for thermal transfer recording.

Claims (2)

[Claims] (1) General formula [I] ▲Mathematical formulas, chemical formulas, tables, etc.▼[I] (In the formula, X is a hydrogen atom, methyl group, methoxy group, formylamino group, acetylamino group, propionylamino group, chlorine atom , represents a bromine atom, an iodine atom or a fluorine atom, Y represents a hydrogen atom, a methoxy group, an ethoxy group, a chlorine atom, a bromine atom, an iodine atom, a fluorine atom or a methyl group, and R, R^1 and R^2 are (represents a hydrogen atom or a substituted or unsubstituted C_1 to C_8 aryl group.) A dye for thermal transfer recording. (2) In the dye for thermal transfer recording according to claim 1, R, R^1 and R^2 are hydrogen atoms, C_1
~C_8 alkyl group, C_3 to C_8 alkoxyalkyl group, C_2 to C_4 hydroxyalkyl group, C
A dye representing a halogenated alkyl group, β-cyanoethyl group, β-chloroethyl group, allyl group, or tetrahydrofurfuryl group of _1 to C_8.