JPS6157391A - Sublimation transfer material - Google Patents

Abstract

PURPOSE:To obtain a cyan color sublimation transfer material having favorable sublimability and excellent preservation stability, by using one or more specified cyan coloring materias as a sublimable coloring matter in a sublimation transfer material. CONSTITUTION:One or more coloring matter of formula I, wherein R is alkyl, aralkyl, alkenyl, or 5- or 6-membered cycloalkyl, are dissolved or dispersed in a solvent together with a binder such as dammer, methyl cellulose and polyvinyl alcohol and, in the case of laser as a heat source, a compound having absorption at the wavelength of laser light, and the resulting liquid is applied to a base such as a condenser paper, cellophane and a polyimide resin film to produce the sublimation transfer material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sublimation and flower transfer material characterized by using a cyan dye having excellent sublimation properties. The sublimation transfer image recording method is a method of sublimating dyes using heat to form images, and is currently attracting attention as a method of obtaining color hard copies from televisions, ORT color displays, color facsimiles, magnetic cameras, etc. .

As a heat source, a heating element or a laser, especially a semiconductor laser, is used.

Currently, cyan dyes for sublimation transfer are selected from dyes that are close to cyan and are mainly used as disperse dyes, but all of them either have insufficient sublimation properties or the hue is not true. However, it has disadvantages such as not having a cyan color, and also having poor storage stability of recorded images. In particular, the low sublimability means that it is necessary to increase the output of the exothermic electrons or laser used as a heat source to sublimate these dyes, and as a result, the life of the heat source is shortened and the practicality of the recording device is reduced. The problem was that it would disappear. For this reason, there is strong demand for the development of dyes that have good sublimation properties, excellent storage stability, and have the hues of the three primary colors, cyan, magenta, and yellow, through subtractive mixing. In addition, the poor storage stability of recorded images causes the phenomenon that the recorded images change color or fade during storage, which is a big problem in practical use.

An object of the present invention is to provide a cyan sublimation transfer material having good sublimation properties and excellent storage stability.

That is, the present invention provides a sublimation transfer material using a sublimation transfer recording method in which a dye is sublimated by heat from an ink layer provided on a substrate to form an image on printing paper, and is provided by the following general formula (I) % formula % (formula (wherein, R represents an alkyl group, an aralkyl group, an alkenyl group, an aryl group, or a 6- or 6-membered cycloalkyl group). It is.

In general formula (I), R is a straight H or branched alkyl group such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, benzyl group, phenethyl group, etc. Examples include aralkyl groups such as allyl groups, alkenyl groups such as vinyl groups, phenyl groups, cyclopentyl groups, and cyclohexyl groups.

Among these, preferable examples include methyl group, ethyl group, propyl group, butyl group, benzyl group, allyl group, vinyl group, phenyl group, cyclopentyl group, and cyclohexyl group.

The dye represented by the general formula (I) can be prepared by a known method, for example,
It is synthesized using the reaction formula below.

(In the formula, R represents the above-mentioned meaning.) A sublimation transfer material is manufactured by applying a pigment ink onto a transfer substrate. Transfer substrates generally include condenser paper,
Cellophane, polyimide resin, polyester resin, polyether sulfone resin, or a ribbon-like or film-like material treated with these resins to improve heat resistance and/or smoothness is used.

Dye ink generally consists of a sublimable dye, a binder, and, if a laser is used as a heat source, a compound that absorbs at the laser's oscillation wavelength, and is dissolved or atomized in a solvent using a ball mill or paint conditioner. Manufactured by

As a binder, natural resins such as dammar, gum arabic, gum tragacanth, dextrin or casein or modified resins thereof, cellulose resins such as methylcellulose, ethylcellulose, hydroxyethylcellulose, ethylhydroxycellulose or nitrocellulose, polyvinyl alcohol or polyvinyl acetate, etc. One kind or a mixture of two or more kinds of vinyl resins can be used.

Solvents for dissolving or dispersing dyes and binders include water, alcohols such as ethanol, propatool, and butanol, ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone, and aromatic carbons such as toluene, xylene, and monochlorobenzene. One or a mixture of two or more of hydrogens, chlorine solvents such as dichloroethane, trichlorethylene, and perchlorethylene, and acetate esters such as ethyl acetate, butyl acetate, and ethoxyethyl acetate are used.

Carbon black, phthalocyanine dyes, dithiol complexes, naphthoquinones, and the like are used as compounds that absorb at the laser oscillation wavelength.

The dye ink thus obtained is applied onto a transfer substrate using a bar I-tar, a roll coater, a knife I-tar, screen printing, gravure printing, etc.
A sublimation transfer body is manufactured.

Printing paper can be paper coated with polyester resin or polyamide resin, synthetic paper such as polypropylene, polyvinyl chloride, or polyester, or synthetic paper that has been treated to improve heat resistance, etc., as necessary. Those coated with polyester resin, polyamide resin, etc., which have a strong affinity with dyes, are used.

Hereinafter, the present invention will be described in detail with reference to Examples. In the examples, parts represent parts by weight.

Example 1 6 parts of ethyl cellulose, 5 parts of 1-amino-2°8-dicyano-4-methylaminoanthraquinone, 71 parts of xylene
．． After sufficiently kneading an ink composition containing 2 parts of n-butanol and 17.8 parts of n-butanol using a paint conditioner, the ink composition was coated on condenser paper using a bar coater and dried to obtain a sublimation transfer material. When this transfer body was placed opposite paper coated with polyethylene terephthalate resin and heated with a heating element, a clear cyan-colored image with high density was obtained on the paper.

This cyan-colored image will not fade or fade when exposed to sunlight.
It did not change color and had excellent storage stability.

The dye used in this example was synthesized as follows.

1-Amino-4-bromanthraquinone-2-sulfonic acid 180 parts, methylamine 200 parts, sodium carbonate 6
4 parts, 5.8 parts of copper sulfate (dissolved in 25 parts of water) to 4260 parts of water
The mixture was mixed with a portion of the liquid, sealed tightly, and heated to 80°C in 1 hour, and kept at the same temperature for 2 hours. Then, distilled under reduced pressure to 400%
The volume is distilled off, heated to 98°C at normal pressure, and filtered hot. The added solution is precipitated with hydrochloric acid to precipitate crystals,
After washing, 128 parts of l-amino-4-methylaminoanthraquinone-2-sulfonic acid were obtained.

Next, 67.6 parts of this 1-amino-4-methylaminoanthraquinone-2-sulfonic acid, 900 parts of water, and 16.5 parts of potassium carbonate were mixed, and 98 parts of sodium cyanide and m
- Add 45 m of sodium nitrobenzene sulfonate and 7.5 parts of ammonium bicarbonate, and keep warm at 85-90°C for 6 hours. Thereafter, the mixture was cooled to 60° C., extruded, washed with water, and dried to obtain 59.1 parts of 1-amino-2,3-dicyano-4-methylaminoanthoquinone.

Example 2 The dyes shown in Table 1 were synthesized in the same manner as in Example 1, and sublimation transfer was performed on each dye to obtain a highly concentrated dye with excellent storage stability. A clear cyan-colored image was obtained.

Table 1

Claims (1)

[Scope of Claims] In a sublimation transfer body of a sublimation transfer recording system in which a dye is sublimated by heat from an ink layer provided on a substrate to form an image on printing paper, the following general formula (I) ▲Mathematical formula, chemical formula, There are tables, etc. ▼ (I) (In the formula, R represents an alkyl group, an aralkyl group, an alkenyl group, an aryl group, or a 5- or 6-membered cycloalkyl group.) One or more types of dyes are used. A sublimation transfer material characterized by: