JPS6141596A - Ink composition for thermal recording transfer body - 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 an ink composition used for a sublimation type heat-sensitive recording transfer material, and in particular, it relates to an ink composition used for a sublimation type heat-sensitive recording transfer material, and in particular for uniformly coating a coloring material layer containing a sublimable dye on a substrate. The present invention relates to an ink composition that can be used as an ink composition.

Conventional structure and problems In the sublimation thermal recording method, a transfer sheet is coated with ink containing a sublimable dye on a substrate to form a coloring material layer, and is heated by a thermal head to sublimate the dye and transfer it to the transfer sheet. Since the amount of dye sublimation transfer can be controlled by changing the energy given to the thermal head, gradation recording is easy and it is particularly advantageous for full-color recording.

Conventionally, the sublimable dyes used in this recording method have generally been dyes for transfer printing of polyester fibers, which have excellent stability. It was difficult to obtain sufficient color density with energy.

Furthermore, although ionic dyes containing highly sublimable color formers can provide sufficient color density, they have problems with storage stability.

The transfer sheet used in this recording method is prepared by preparing ink by dissolving or dispersing sublimable dye in various solvents with a binder, uniformly coating the ink on the substrate, and drying the solvent. It is something to do. However, nonionic dyes have low solubility in various solvents, and even those that are soluble often recrystallize on the transfer sheet due to drying of the solvent during coating. When transfer recording is performed using a transfer sheet in which the dye has recrystallized,
Sublimation transfer is not performed in accordance with the shape of the heating element, and transfer other than sublimation occurs due to irregularities on the sheet, resulting in color unevenness in the recorded image, making it impossible to obtain high-quality recording. on the other hand,
Sublimable dyes are generally difficult to crush into fine particles;
It was difficult to prepare fine particle dispersed ink.

OBJECTS OF THE INVENTION An object of the present invention is to provide an ink composition for thermal recording and transfer materials that uses a sublimable dye that is stable and has excellent sublimation ability, and provides sufficient recording density and good image quality.

The following general formulas (I), (It), (Il
At least one type of sublimable dye represented by l) and polysulfone, polyethersulfone, polycarbonate, polyphenylene oxide, polyarylate.

Or at least one type of binder such as cellulose acetate, a chlorinated solvent, a brominated solvent, and toluene.

Isopropyl alcohol, cyclohexanone, 1゜4-
The present invention relates to an ink composition for heat-sensitive recording and transfer materials comprising at least one type of solvent selected from Shiixane.

6 A, -, - (wherein, X represents a hydrogen atom or a methyl group, and B and R/ each represent a methyl group, an ethyl group, a linear or branched propyl group, or a butyl group).

Description of Examples Specific examples of sublimable dyes represented by general formulas (I), (U), and (2) include the following.

Substances that emit a cyan color represented by (1): 1,5-bis(methylamino)-4,B-naphthoquinone, 1,5-
Bis(etheramino)-4,8-naphthoquinone, 1,5
-bis((b)-propylamino)-4,8-naphthoquinone, 1゜6-bis((iso)-propylamino)-
4,8-naphthoquinone, 1,5-bis((→-butylamino)-4,B-naphthoquinone, 1,5-bis((is
o)-butylamino)-4,8-naphthoquinone, 1-methylamino-5-ethelamino-4,8-naphthoquinone, 1-methylamino-5-(n)-propylamino-4
, 8-naphthoquinone, 1-methylamino-5-(→-butylamino-4゜8-naphthoquinone, 1-methylamino-6-(i-)-propylamino-4,8-naphthoquinone, 1-ethelamino-5-(n) -Propylamino-
4,8-naphthoquinone, 1-ethylamino-5-(n)
-butylamino-4,8-naphthoquinone, 1-(n)-
Propylamino-5-(n)-butylamino-4,8-
Naphthoquinone.

Something that emits a yellow color represented by (II) = 4-(
2,2-dicyanovinyl)-N,N-dimethylaniline, 4-(2,2-dicyanovinyl)-N,N-diethylaniline, 4-(2゜2-dicyanovinyl)-N,N-
Di(n)-propylaniline, 4-(2,2-dicyanovinyl)-N, N-di(iSO)-propylaniline, 4-(2,2-dicyanovinyl)-N, N-
di((b)-butylaniline, 4-(2,2-dicyanoviny(v)-N,N-di(iso)-butylaniline,
4-(2,2-dicyanovinyl) -N, N-di(
SQc)-butylaniline, 3-methyl-4-(2,2
-dicyanovinyl)-N,N-dimethylaniline, 3-
Methyl-4-(2,2-dicyanoviny-4-(2,2-
dicyanovinyl)-N,N-di(n)-propylaniline, 3-methyl-4-(2,2-dicyanovinyl/l/)
-N,N-di(iso)-propylaniline, 3-methyl-4-(2.

2-dicyanovinyl)-N,N-di(n)-butylaniline, 3-methyl-4-(2,2-dicyanovinyl)-
N.
-N,N-di(sec)-butylaniline, 4-(2
,2-dicyanovinyl) -N-xthyl-N -(n)
-furopylaniline, 4-(2,2-dicyanovinyl)
-N-ethyl-N-〇)-butylaniline, 4-(2,
2-dicyanovinyl)-N-methyl-N-(n)-propylaniline, 4-(2,2-dicyanovinyl)-N
-Methyl-N-(n)-butylaniline, 3-methyl-4-(2,2-dicyanovinyl)-N-methyl-N-
(b)-Propylaniline, 3-methyl-4-(2,2
-dicyanovinyl)-N-methyl-N-(n)-butylaniline, 3-methyl-4-(2,2-dicyanovinyl)-N~ethyl-N-(n)-7'ropylaniline, 3-methyl -4-(2,2-dicyanovinyl)-N
-Ether-N-(ro)-butylaniline, (Those that emit magenta color represented by 1: 4-tricyanovinyl-N, -N-dimethylaniline, 4-tricyanovinyl-N, N-diethylaniline, 4 -tricyanovinyl-N,N-di(ro)-propylaniline,
4-tricyanovinyl-N,N-di(lso)-propylaniline, -4-tricyanovinyl-N,N-di(
b)-butylaniline, 4-tricyanovinyl-N,N
-di(iS)-butylaniline, 4-tricyanovinyl-N,N-di(SeC)-butylaniline, 3-methyl-4-tricyanovinyl-N,N-dimethy/l/7niline, 4- Tricyanovinyl-N-methyl-N-(n)-
Propylaniline, 4-tricyanovinyl-N-methyl-N-(ro)-butylanili7.4-)dicyanovinyl-N-ethyl-N-10,, -7. (→-Propylaniline, 4-tricyano Vinyl-N-
Ethyl-N-(n)-butylaniline, 4-tricyanovinyl-N-ethyl-N-(iso)-butylaniline, 4-tricyanovinyl-N-ethyl-N-(se
c) -Butylaniline, 4-tricyanovinyl-N-(
b)-propyl-N-(,1)-butylaniline, 3-
Methyl-4-tricyano may be used in combination of two or more types having different substituents.

Preferred binders include polysulfone, polyethersulfone, polycarbonate, polyphenylene oxide, polyarylate, and cellulose acetate, which have excellent solubility and heat resistance.

These binders have good adhesion to the film substrate and excellent heat resistance, so they do not peel off from the substrate even when heated during recording. Furthermore, sufficient recording density can be obtained due to good adhesion and dispersibility.

Furthermore, since it has good compatibility with the dye represented by the general formula (1), (n), @), good image quality can be obtained due to uniform sublimation of the dye. In addition to being used as a binder, the above resin is also used as a viscosity modifier in ink compositions, and the amount used varies depending on the printing method, but it is usually in the range of 6 to 20 parts by weight, particularly 7 to 15 parts by weight. used in

The polysulfone in the resin has good heat resistance, adhesion, and compatibility with dyes, and is compatible with chlorinated solvents.

Since the solubility in brominated solvents is 20% by weight or more, various viscosities can be adjusted, which is particularly effective.

Examples of solvents for preparing the ink include methylene chloride, chlorobenzene, chloroform, chlorinated solvents such as 1,2-dichloroethane, brominated solvents such as bromoform and 1°2-dibromoethane, and the like; (II)
, @) and solvents with high solubility for the above resins are suitable. Also, toluene and isopropyl alcohol may be resistant to dyes,
Even if they are dispersed, they can be used as office ladies.

It is also effective to include an inorganic pigment such as silica or alumina in the coloring material layer in order to impart heat resistance to the coloring material layer and to avoid direct contact between the coloring material layer and the image receptor. Range 1 from 0.1 to 30P (Poise)
ffi is suitable and can be applied to a wide range of printing methods such as gravure, flexible printing, offset and screen printing, and the amount of ink deposited after drying is suitable in the range of 0.1 to 10 g/door.

The present invention will be explained in more detail below using specific examples.

EXAMPLE Examples of manufacturing, printing, and recording using the ink composition of the present invention will be explained.

(1) Production of ink composition 120 parts by weight of alumina particles having an average particle diameter of 3 μm are mixed with 100 parts by weight of polysulfof A15 monochlorobenzene solution, and the mixture is kneaded for 5 minutes in a three-roll mill to disperse the mixture.
It was made into a master batch.

To these, a dye represented by the following structural formula, a monochlorobenzene solution of polysulfone, and monochlorobenzene were added to prepare an ink composition. However, the cyan dye was used by kneading the ink composition in a ball mill for 20 hours to atomize and disperse the dye. Yellow magenta was used in a completely dissolved system.

1! 4Et% Poly Monochlorbe Manutano Chichi
Ink composition dye and its amount
Viscosity (parts by weight) (parts by weight) (parts by weight)
(Poise)cyan; Compound of formula (3) 10[] 28
0 7 (20 parts by weight) Magenta; Formula (compound of (7,5 parts by weight), 10.0 15
ao 5.3 Formula (C) αH (7.5 parts by weight) Yellow; Compound of formula (D) 100 3 55
4.114A-Di (2) Printing These ink compositions were coated on both sides with a 1 μm thick ultraviolet curable resin using a gravure printing machine as shown in Figure 1.
Ink composition 1 printed on a thick polyethylene terephthalate film (PET) is supplied from an ink pan 2 to a plate cylinder 3, and excess ink composition 1 is transferred to a doctor blade 4.
1. Printing was carried out on the PET 6 on the impression cylinder 5 while scraping it off.

Although Figure 1 only shows printing with one type of ink composition, the actual printing is performed by arranging three of the same units in series as in Figure 1 and printing magenta, yellow, and cyan inks in that order, as shown in Figure 2. 2, magenta 7, yellow 8. A transfer body 10 having cyan 9 patterns lined up was obtained.

(3) Recording FIG. 3 shows an example of recording using the dye transfer member as described above.

The transfer body 1o has a structure in which a coloring material layer consisting of a binder 13, a dye 14, and pigment particles 15 is formed on PETe, and a thermal head 11 is placed on the PETe side and a coloring material layer is placed on the coloring material layer side. The image receptors 12 were arranged respectively. Recording was performed using the thermal head 11 on an image receptor 12 made of polypropylene synthetic paper coated with polyester under the following conditions.

Linear density of main scanning and sub-scanning: 4 dots/rrr1n Recording power: 0.7 W/dot head heating time: 2 to 5 m5ec As a result, each color has pixels corresponding to dots at each heating time, and average recording at 8 m5eC Images with densities (average values of reflection densities of five different 51rrIn diameter recording areas) of 1.6, 1.0, and 1.5 or higher were obtained for magenta, yellow, and cyan, respectively.

When these images were subjected to a sunlight fastness test according to J I 80841, all of them were found to have a sunlight fastness of grade 3 to 5.

In addition to the examples, general formula (■) is used as a sublimable dye.

High viscosity ink compositions using various dyes represented by (■) and (7) and adjusting the amount of solvent appropriately can also be used for flexographic printing,
Good results were obtained by printing using offset printing.

Effects of the Invention As described above, the present invention provides an ink composition for thermal recording and transfer materials that uses a sublimable dye that is stable and has excellent sublimation ability, and provides sufficient recording density and good image quality.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an outline of a gravure printing machine using the ink composition for thermal recording transfer material of the present invention, FIG. 2 is a plan view showing a printing pattern by gravure printing, and FIG. FIG. 3 is a cross-sectional view showing an example of the recording state used. 1... Ink composition, 2... Ink pan, 3... Plate cylinder, 6... PET, 1o
... Transfer body, 13 ... Binder, 14.
...Dye, 15...Pigment particles.

Claims (5)

[Claims] (1) At least one dye selected from sublimable dyes represented by the following general formulas (I), (II), and (III), and polysulfone, polyethersulfone, polycarbonate, polyphenylene oxide, polyarylate, and cellulose acetate. At least one type of binder, chlorinated solvent, brominated solvent, toluene, isopropyl alcohol,
Ink composition for thermal recording transfer material consisting of at least one solvent selected from cyclohexanone and 1,4-dioxane ▲ Contains mathematical formulas, chemical formulas, tables, etc. ▼...(I) ▲ Contains mathematical formulas, chemical formulas, tables, etc. ▼...(II) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(III) (In the formula, X is a hydrogen atom or a methyl group, and R and R' are each a methyl group, an ether group, a linear or (represents a branched propyl group or butyl group). (2) Claim 1, wherein the dye is composed of two or more sublimable dyes having different substituents among the dyes represented by the general formula (I), (II) or (III). Ink composition for thermal recording transfer material. (3) The ink composition for a thermal recording transfer material according to claim (1), wherein the sublimable dye is dissolved in a solvent. (4) The ink composition for a thermal recording transfer material according to claim (1), wherein the sublimable dye is dispersed in a solvent. (5) The ink composition for a thermal recording transfer material according to claim (1), which is a mixed system in which the sublimable dye is dissolved in a solvent and dispersed in a solvent.