JPS63182192A - 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 Art) Conventionally, there has been a demand for technology for color recording facsimile printers, copying machines, 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.

Thermal transfer methods include a melting method in which a transfer sheet with a heat-melting ink layer formed on a base film is heated by a heat-sensitive head to melt the ink and transfer recording onto a recording medium; There is a sublimation method in which a transfer sheet with an ink layer containing a sublimable dye formed on the ilm is heated by a thermal head to sublimate the dye and transfer and record onto the recording medium.The sublimation method uses a thermal head. Since the amount of sublimation transfer of the dye can be controlled by changing the energy applied to the dye, gradation recording becomes easy and is considered to be particularly advantageous for full-color recording.

However, in sublimation type thermal transfer recording, there is a need for one that can perform transfer recording with low energy and also has good storage stability of the resulting recorded material.

(Problems to be Solved by the Invention) The present invention provides a yellowish thermal transfer system that has good sensitivity and can perform transfer recording with low energy, and can provide recorded matter with good storage stability. The gist thereof is a heat-sensitive transfer sheet characterized by having a coloring material layer containing a quinophthalone-based dye represented by the following general formula [C] and L plate] on a base film.

optionally substituted aralkoxyalkyl group, optionally substituted aralkyloxyalkyl group, optionally substituted allyloxyalkyl group, optionally substituted aryloxyalkyl group, tetrahydrofurfuryl group, furfuryl group, cycloalkyl group When recording is performed using a heat-sensitive transfer sheet using a quinophthalone dye represented by general formulas (I) and (n) representing an allyl group, an allyl group, or an aralkyl group, the storage stability of the resulting recorded material is as follows: Although it is very good, the sensitivity during recording is not sufficient and a large amount of energy is required during recording.

Further studies on the dyes represented by formulas (1) and (II) revealed that when a thermal transfer sheet is made using a mixture of them, the sensitivity of the transfer sheet is improved compared to when a single dye is used. We discovered that recording can be done with low energy.

Examples of the halogen atoms for X and X' in general formulas (1) and (II) include chlorine atoms and bromine atoms.

The simple alkyl group in the above formula (II) is a straight chain or branched chain such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, decyl group, dotecyl group, etc. C! , -c, 2 alkyl groups.

The optionally substituted alkoxyalkyl group is λ
-methoxyethyl group, -monoethoxyethyl group, -2-(
n) propoxyethyl group, λ-(iao) propoxyethyl group 1.2-(n) butoxyethyl group, no(iso
) butoxyethyl group, 2-(sec) butoxyethyl group, -2-(n) pentyloxyethyl group, co-(n) hexyloxyethyl group, -2-(n) octyloxyethyl group, 2-( J-ethylhexyloxy)ethyl group,
/-methyl-λ-methoxyethyl group, /-methyl-no-ethoxyethyl group, /-methyl-λ-(n)propoxyethyl group, /-methyl-2-(iso)propoxyethyl group, l-methyl-1 - (n) 7' toxyethyl group, /
-Methyl-λ-(iso)butoxyethyl group, /-methyl-co-(n)hexyloxyethyl group, /-methyl-
, 2-(x-ethylhexyloxy)ethyl group, 3-methoxybutyl group, 3-ethoxybutyl group, l-ethyl-
Examples include λ-methoxyethyl group, l-ethyl-ethoxyethyl group, and C3 to C8 β-alkoxyethyl group is particularly preferred.

Examples of the optionally substituted aralkyloxyalkyl group include 1-benzyloxyethyl group, /-methyl-penzyloxyethyl group, /-ZfA/-2-benzyloxyethyl group, ! -(β-phenylethyl)oxyethyl group.

Examples of the allyloxytrilkyl group which may be substituted include a Ni-allyloxyethyl group, a /-methyl-2-allyloxyethyl group, and a /-ethyl Ni-allyloxyethyl group.

Examples of the optionally substituted aryloxyalkyl group include a -1-phenoxyethyl group, a /-methyl-no-phenoxyethyl group, and a /-ethyl-no-phenoxyethyl group.

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

Examples of the aralkyl group include a benzyl group and a no-phenylethyl group.

The method for producing the heat-sensitive transfer sheet of the present invention can be carried out by dissolving or dispersing the dye in a medium together with a binder in the form of fine particles, applying the ink onto a base film, and drying the ink.

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 additives and water-soluble tree fibers.

In addition to water, media for ink preparation include alcohols such as methyl alcohol, imbutyl alcohol, and imbutyl alcohol, cellosolders such as methyl cellosolve and ethyl cellosolve, aromatics such as toluene, xylene, and chlorobenzene, and acetic acid. Esters such as ethyl and butyl acetate; ketos such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone;
Examples include chlorinated solvents such as methylene chloride, chloroform, and trichloroethylene, ethers such as tetrahydro7rane and dioxane, and organic solvents such as N,N-dimethylformamide and N-methylpyrrolidone.

In addition to the above ingredients, the above ink contains organic and inorganic non-adsorbable fine particles, dispersants, antistatic agents, antiblocking 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 can be in the range of 3 to 100 μm.

Among the above base films, polyethylene terephthalate film is particularly advantageous when considering mechanical strength, solvent resistance, economic efficiency, etc. However, in the case of such films, heat resistance is not necessarily the key, and running properties of the thermal head are poor. By providing a layer of heat-resistant resin containing a surfactant, highly slippery heat-resistant particles, etc. on the opposite side 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., and the thickness of the ink layer can be adjusted after drying. It is sufficient to apply the coating in a range of o, i to 5 μm (Yuji Harasaki, Maki Shoten/published in 1997 [Coating Method]).

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

Examples / Preparation of Lii/Li The above dyes (AJ j , li
'The above dye (J3)! rg
Cellulose acetate 109 (manufactured by Daicel Chemical Co., Ltd., L-, 30) Total ioog
The mixture having the above composition was treated with a paint conditioner for 70 minutes to prepare an ink.

b) Preparation of transfer sheet A polyethylene terephthalate film (6 μm
A transfer sheet was obtained by applying the coating onto a dry film thickness (in terms of dry film thickness/μm) and drying it.

In addition, the heat-resistant lubricity treatment of the polyethylene terephthalate film is performed by adding parts by weight of a polycarbonate resin having a repeating structural unit shown by the following formula to the polyethylene terephthalate film, parts by weight of a phosphate ester surfactant (
Product name Nigelaisurf A-ko OgB: Product of Daiichi Kogyo Seiyaku Co., Ltd. Apply a liquid consisting of 91 parts by weight of toluene,
This was done by drying (drying thickness approximately O, S μm).

Preparation of image receptor Saturated polyester resin (Product name: TP-U Co., Ltd. product) io part, amine-modified silicone (m
Product name: KF'J9.7, Shin-Etsu Chemical Co., Ltd. product)
A liquid consisting of 0.5 parts of methyl ethyl ketone, 75 parts of methyl ethyl ketone, and lj parts of xylene was added to synthetic paper (product name:
Apply to Oji Yuka Co., Ltd. product) with a wire bar, dry it (dry film thickness: jμm), and then dry it at ioo℃ in the open.
An image receptor was prepared by heat treatment for 0 minutes.

d) Transfer Recording The ink coated surface of the above transfer sheet was overlapped with a recording medium and recording was performed using a thermal head under the following conditions, and the results showed the recording characteristics shown in FIG. 1.

Recording conditions Linear density of main scanning and sub-scanning: 2 dots/So-called recording power: 0.2! ;W/don't heat heating time 2/~t milliseconds Color hardness is measured using a densitometer TR manufactured by Macbeth, USA.
Measurements were made using Model -927.

A light resistance test of the obtained record was carried out using a carbon arc fade meter (manufactured by Suga Test Instruments Co., Ltd. (black panel temperature 6J±λ℃), but there was almost no discoloration or fading after irradiation with aO waiting time. In addition, the transfer sheet and recording were stable against heat and moisture, and had excellent storage stability in the dark.

Comparative Example/In preparing the ink, only the dye (A) used in Example/Q! ! The ink was prepared, the transfer sheet was prepared, the image receptor was prepared, and the transfer recording was carried out in the same manner as in Example 1 except for the use. As a result, the recording characteristics shown in FIG. 7 were obtained.

Comparative Example In preparing a coin ink, only 70 g of the dye (B) used in Example 1 was used, and otherwise the ink was prepared, a transfer sheet was prepared, an image receptor was prepared, and transfer recording was performed in the same manner as in Example 1. As a result, the recording characteristics shown in FIG. 7 were obtained.

(Operations and Effects of the Invention) When the heat-sensitive transfer sheet of the present invention is used, it is possible to obtain a yellow recording with high density with low energy, and the storage stability of the obtained recording is very good. be.

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

Example = In preparing ink, use the following dyes (C) and (Dl) respectively!
? The ink was prepared, the transfer sheet was prepared, the image receptor was prepared, and the transfer recording was performed in the same manner as in Example except that the ink was used, and as a result, the recording characteristics shown in Figure C were obtained.

r Comparative Example 3 In the preparation of ink, only the dye tol used in Example λ was used as 709, and the other methods were the same as in Example 1. As a result, the recording characteristics shown in Figure C were obtained.

Comparative Example: In preparing the ink, only the dye CD used in Example 2 was used, and the other methods were the same as in Example λ.Preparation of the ink, preparation of the transfer sheet, preparation of the image receptor, and transfer. As a result of recording, the recording characteristics shown in the figure were shown.

Example 3 Preparation of ink, preparation of transfer sheet, preparation of image receptor, and transfer recording in the same manner as in Example except that the above dye tA] and the following dye (gradient Jt were used) As a result, recording characteristics shown in FIG. 3 were obtained.

r Comparative example! Ink! I! Dye used in Example 3 in J-crack (]!
Ink was prepared, a transfer sheet was prepared, an image receptor was prepared, and transfer recording was carried out in the same manner as in Example 3, except that only J was used at 101. As a result, the recording characteristics shown in FIG. 3 were obtained.

[Brief explanation of the drawing]

Example/, Comparative Example/, Comparative Example Ko, Example Ko, Comparative Example 3,
Comparative example, Example 3, comparative example! The recording characteristics recorded using the heat-sensitive transfer sheet devitrified by , are shown in Figure 3. The vertical axis represents color density, and the horizontal axis represents application time (milliseconds). Patent applicant Mitsubishi Chemical Industries, Ltd. Agent Patent attorney For long diameters - (and 7 others) Application time for drawings (millimeters) Figure 3 Printing force for drawings (millimeters) Procedural amendment dated April 10, 1986

Claims (1)

[Claims] (1) Apply the following general formulas [I] and [II] on the base film.
] A heat-sensitive transfer sheet characterized by having a coloring material layer containing a quinophthalone-based dye. ▲There are mathematical formulas, chemical formulas, tables, etc.▼・・・・・・・・・
・・・〔I〕 ▲There are mathematical formulas, chemical formulas, tables, etc.▼・・・・・・・・・
... [II] (In formula (II), X and X' are hydrogen atoms or halogen atoms, R is an alkyl group, an optionally substituted alkoxyalkyl group, an optionally substituted aralkyloxyalkyl group, (represents an optionally substituted allyloxyalkyl group, an optionally substituted aryloxyalkyl group, a tetrahydrofurfuryl group, a furfuryl group, a cycloalkyl group, an allyl group, or an aralkyl group)