JPS6239293A - Thermal recording material - Google Patents

Abstract

PURPOSE:To enable full-color images to be formed and enable transfer recording to be performed at a high speed, by constituting a base of an aromatic polyamide film, in a thermal recording material which comprises a dye layer comprising a sublimable dye on a base. CONSTITUTION:The base 2 of the recording material 1 consists of an aromatic polyamide film, and the dye layer 3 is formed of a mixture of a sublimable dye and a binder resin. The sublimable dye is a dye which is sublimed or evaporated in a temperature range of 70-300 deg.C, and may be a disperse dye, a basic dye, an oil-soluble dye or the like. The binder resin is preferably a resin having a softening temperature of not lower than 80 deg.C, more preferably, not lower than 100 deg.C, for example, a polyamide resin, a polyester resin, a polyvinyl chloride resin or a polyolefin resin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a heat-sensitive recording material from which a full-color image can be obtained by thermal transfer.

[Prior art]

In recent years, with the rapid development of the information industry, various information processing systems have been developed, and recording methods and devices suitable for each information processing system have also been developed and adopted. The thermal recording method is one of these recording methods, and has recently become widely used because the equipment used is lightweight, compact, noiseless, has excellent operability and maintainability, and can be easily converted to color. . This thermal transfer recording method can be roughly divided into two methods.The first method is to apply heat to a specific heat-melting ink coated on a support from the support side to melt it in the form of a heat-applied pattern. The second method is to apply heat to a heat-sensitive recording material made of a resin with a high softening point and a sublimable dye on a support from the base material side, and sublimate the heat-applied pattern. This method involves sublimating the dye and transferring it to the recording medium.

In order to obtain a full-color image, the latter method can be said to be more advantageous because it can achieve density gradation, but the latter method also has the drawback of requiring higher thermal energy than the former method, as is generally known. For this purpose, polyethylene terephthalate film (hereinafter referred to as PET) and condenser paper are used as the base material, but when PET is thin, it melts and creates holes when high heat is applied to it, so even when used as condenser paper, It is not possible to make it thinner in terms of strength and dimensional stability, which is disadvantageous for increasing the speed of transfer recording.Also, it is possible to use sublimable dyes that sublime at low temperatures, but Those using dyes had drawbacks such as poor transfer stability and storage stability, making it difficult to increase the speed.

[Problems to be solved by the invention]

The present invention has been made to provide a heat-sensitive recording material that can form full-color images and achieve high-speed transfer recording.

[Means for solving problems]

That is, the heat-sensitive recording material provided by the present invention has a dye layer containing a sublimable dye on a support, and is characterized in that the support is made of an aromatic polyamide film. .

[Detailed description and examples of the invention]

The present invention will be explained in more detail below with reference to the drawings. Unless otherwise specified, "parts" and "%" expressing quantitative ratios are based on weight.

<Specific Description of the Invention> FIG. 1 shows a heat-sensitive recording material 1 having a basic configuration according to the present invention.
2 is a schematic cross-sectional view of 2, 2 is a support, and 3 is a dye layer.

The aromatic polyamide film constituting the support 2t has a basic skeleton having the general formula % (where Ar and Ar' each represent an optionally substituted arylene group such as a phenylene group).

The main component is a structural unit represented by sb, where n represents the degree of polymerization; It can be obtained from a combination of diisocyanate and dicarboxylic acid by interfacial condensation method, low temperature solution polymerization method, etc.

Specific examples of the structural unit of the general formula include the following.

(However, X and Y each represent a hydrogen atom, a rogone atom, an alkyl group having 1 to 20 carbon atoms, a nitro group, or a phenyl group). The basic skeleton may contain one or more types of sulfone bonds and ether bonds. Further, in addition to the amide bond found in the basic skeleton, it may contain a urea bond or an imide bond.

Although the dye layer 3 can be composed of only a sublimable dye, it is usually composed of a binder resin. As sublimable dyes, dyes that sublimate or evaporate in the range of 70°C to 30°C are used, such as disperse dyes, basic dyes, and oil-soluble dyes.
4GL, Dianix Yellow H2G-FS, Miketon Polyester Yellow 3GSL, Kayaset Yellow 93F, Sumikaronre, DoEFBL, Dianix Red ACE, Miketon Polyester Red FB, Kayaset Red Y126, Miketon Fast Brilliant Blue B, Kayase, Dobrou 136 or the like is preferably used.

As a binder resin, the softening temperature is 80℃ or even 100℃.
Preferably, the resin has a temperature of ℃ or higher, for example, ]? Vinyl resins including IJ amide resins, polyester resins, epoxy resins, IJ vacretan resins, polyacrylic resins (e.g. polymethyl methacrylate, boria silylamide), polyvinylpyrrolidone, polyvinyl chloride resins (e.g. chlorinated vinyl-vinyl acetate copolymer, etc.)
, cellulose resin C such as methyl cellulose, ethyl cellulose.

carboxymethyl cellulose, etc.), polyvinyl alcohol-based resins (e.g. polyvinyl alcohol).

Partially saponified polyvinyl alcohol, etc.) 1 Petroleum based fat, rosin conductor, coumaron-indene resin, terpene resin, novolac type phenolic resin.

Pristyrene resin, polyolefin resin (e.g.
Polyethylene, polypropylene), etc. are used.

In addition, the softening temperature referred to here is the temperature measured by the high-speed vehicle flow tester CF.
Using the T-500 type, the load was 10 and the temperature increase rate was 2℃/
This refers to the temperature at which the sample begins to flow out, measured under conditions of 30 minutes.

If an ungrooved binder resin with a softening temperature of 80° C. is used, the binder may be transferred and cause stains, which is not preferable.

In order to produce the heat-sensitive recording material of the present invention, a support is first prepared as follows. First, an aromatic polyamide obtained from an acid-ride and a diamine by an interfacial polycondensation method is dissolved in an amide solvent such as dimethylformamide or N-methylpyrrolidone, and then cast and stretched.

The thickness is preferably 2μ to 10μ.

Next, for example, -9 Ingu resin is dissolved in a solvent, and a sublimable dye is added thereto and dissolved or dispersed to form an ink.
It is coated with ~20 μmK and dried to form a heat-sensitive recording material.

The heat-sensitive recording material of the present invention can be widely used in fields in which heat-sensitive recording materials are applied, such as facsimiles, printers, and copying machines. To form full-color images in such applications,
Using heat-sensitive recording materials in four colors of cyan, magenta, yellow, and black, or heat-sensitive recording materials in which these colors are regularly divided, the image signal is changed to control the transfer amount of each color, Controls the position and superimposes each color. In this way, by combining the control of the transfer amount and the control of color overlapping, any full-color image can be obtained.

Hereinafter, the present invention will be explained in more detail using Examples.

<Example 1> First, aromatic r obtained from P-7 enylene diamine and isophthalic acid chloride in N-methylpyrrolidone
After IJ amide was dehydrochlorinated and neutralized, it was made into a 15% N-methylpyrrolidone solution, cast onto a stainless steel drum, and concentrated until the solid concentration reached 501. The film was peeled off from the drum and continuously placed in a water bath. Target I'C
After introducing the inorganic salt and removing the water extracted from the inorganic salt, the stretching ratio was set to 1.
The film was stretched twice and fixed at 300°C to obtain a film with a thickness of 4 μm.

Next, 6 parts of a 3-multiple solution of Kayaset Red 126 and 4 parts of a 3% aqueous solution of polyvinyl alcohol were mixed, and the mixture was coated onto the plastic film using an applicator and dried to obtain a heat-sensitive recording material with a total thickness of 12 μm. .

Comparative Example 1> The same dye layer as in Example 1 was provided on a 12 μm condenser paper to obtain a heat-sensitive recording material.

Comparative Example 2> A heat-sensitive recording material was obtained in which the same dye layer as in Example 1 was provided on 4 μPET.

8 heat-sensitive recording materials obtained in Example 1 and Comparative Examples 1 and 2 above
A thermal pattern was applied from the support side using W, recording energy of 0°4 w/d, and heating pulse width of 2 ms@c to transfer the image onto the polyester coated paper.

The results are shown in Table 1 below.

Table 1 [Effects of the Invention] According to the heat-sensitive recording material of the present invention, sufficient heat resistance can be maintained even when the support is made thin, and it is smooth and has good dimensional stability, and has good performance even in high-speed recording. Full color images can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view in the thickness direction of one configuration example of the heat-sensitive recording material of the present invention. 1... Heat-sensitive recording material, 2... Support, 3... Dye layer.

Claims (1)

[Claims] 1. A heat-sensitive recording material having a dye layer containing a sublimable dye on a support, wherein the support is made of an aromatic polyamide film.