JPS60151095A - Thermal transfer recording medium - Google Patents

Abstract

PURPOSE:To avoid the trouble due to static electricity and obtain thermal transfer recording medium free of misreleasing of an ink doner film and a transfer paper, trouble of winding around a feeding roller or the like, by incorporating a conductive material into a thermal transfer recording medium. CONSTITUTION:The recording medium comprising a heat-fusible ink layer 3 on a base 1, and comprises a conductive material. The recording material may be produced by providing the heat-fusible ink layer 3 on one side of the base 1 and providing a conductive material layer 2 on the other side, or by providing a heat-fusible ink layer 4 containing a conductive material on the base 1. In addition, a heat-resistant material layer 5 containing the conductive material may be provided on the base 1 on the side opposite to the ink layer 3. The conductive material may be an inorganic electrolyte such as calcium chloride and alum, a nonionic surface active agent such as a polyether and a polyhydric alcohol, or an inorganic substance such as an aluminum powder and a zinc oxide, which may be used singly or in combination.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording medium for thermal transfer used in thermal recording devices such as thermal facsimiles and printers.

BACKGROUND OF THE INVENTION In recent years, thermal recording using thermal paper has been widely used in thermal recording devices such as 7Aximi IJ due to its excellent operability and maintainability.

However, thermal recording using thermal paper has problems with the storage stability and falsification of the record.Recently, research and development of thermal transfer recording that takes advantage of the advantages of thermal recording and compensates for its shortcomings has been actively conducted, and some of them have been put into practical use. has been done. The heat-sensitive transfer material used in such heat-sensitive transfer recording is a base material such as a thin film or paper coated with heat-melting ink. The principle of thermal transfer recording is as shown below.

That is, plain paper is placed on the heat-fusible ink surface of the heat-sensitive transfer material, and the ink is selectively heated with a thermal head from the side of the base material to which the ink is not applied, and is transferred onto the plain paper. Recording is completed when the thermal transfer material and plain paper are peeled off.

Heat-melting ink for heat-sensitive transfer materials generally has a melting point of 50
Wax-type carbon ink at ~90°C is used. Carbon ink contains little or no oil in consideration of recording durability, stain resistance, etc., and therefore has almost no pressure sensitivity. This is the difference between the C armpit carbon ink and the back carbon ink. The composition of the ink used is, for example, as follows.

Ink composition example Carbon black 15% Dye 5% Toner 3% Paraffin wax 35% Carnauba wax 27% Montan wax 10% Rice wax 5% In addition, appropriate resins are added in consideration of the fastness of the record and stain resistance. Sometimes I do. It is also necessary to select a wax by taking odor into account.

However, conventionally, problems occur with regard to the separation of the ink donor film from the transfer paper and the running properties of the ink donor film due to static electricity, resulting in problems such as errors in peeling from the transfer paper and wrapping around the conveyance roller in the Macun. was.

OBJECTS OF THE INVENTION The object of the present invention is to provide a recording medium for thermal transfer that eliminates the above-mentioned problems caused by static air and that does not cause errors in peeling between an ink donor film and transfer paper or wrapping around a conveyance roller. do.

Structure of the Invention The present invention achieves the above object by incorporating a conductive material into a thermal transfer recording medium. Examples of the structure of the thermal transfer recording medium of the present invention are shown in Figs. f41 to Fig. 5.

In the example shown in Figure 1, a hot-melt ink layer 3 is provided on a base material l of paper or plastic, and a conductive material layer 2 is provided on the opposite side to this ink layer. A conductive material layer is provided between the base material L and the hot melt ink layer 3, and FIG. Figure 4 shows the upper part of the base material 1, and Figure 5 shows the one in which a heat-resistant material layer 5 containing a conductive material is provided on the opposite side of the ink layer 3 on the base material 1. Both are valid.

Furthermore, in either case, a heat-resistant layer may be provided on the opposite side of the base material from the ink layer.

The conductive materials used in the present invention include (1) potassium chloride, calcium chloride, lithium chloride,
Magnesium chloride, sodium chloride, sodium sulfate,
Inorganic electrolytes such as alum: (2) sulfates, sulfonates,
Carboxylate, phosphate, alkyl sulfonate, alkylaryl sulfonate, naphthalene sulfonate,
Anionic surfactants such as naphthalene disulfonate and salts of formalin condensates; (3) Cationic surfactants such as alkyltrimethylammonium salts, alkyldimethylammonium salts, alkyldimethylbenzylammonium salts, alkylhyridium salts, etc. (4) Nonionic surfactants such as polyethers such as polyethylene glycol and polypropylene glycol, and polyhydric alcohols; (5) Long-chain aliphatic groups, quaternary ammonium type nitrogen and carboxyl groups or sulfones; Amphoteric surfactants such as compounds with groups; (6) aluminum powder, copper powder, zinc powder, carbon black, dalaphite, silica, alumina powder, iodized steel,
Inorganic substances such as zinc oxide: (7) polydimethyldiarylammonium chloride,
polyvinylbenzyltrimethylammonium chloride,
Polymer electrolytes such as oligostyrene sulfonates; (8) Organic semiconductors such as carbazole complexes and thiazine complexes; and any substance selected from the above group can be used singly or in combination of two or more.

However, the above-mentioned materials are just examples, and the conductive material is not limited to these, and any material can be used as long as it provides a similar conductive effect.

These awakening materials are combined with known binders, resins, etc.
Melamine resin, phenol resin, fluororesin, polyimide resin, nitrocellulose, etc. can be used.

Next, the thermal transfer recording medium of the present invention will be explained with reference to Examples and Comparative Examples.

Example 1 On a 6 μm polyester film, a hot melt ink having the following composition: carbon black 15% dyeing class 5 chitoner 3 chiparafine wax 35 chicarnauba wax 27% montan wax 10% rice wax 5 cycles was dried with a roll coater. The subsequent coating amount (the same applies below) was adjusted to 5.0 f/, /, and a coating solution consisting of 10 parts by weight of quaternary ammonium salt, 5 parts of carboxymethyl cellulose, and 100 parts of water was applied on the side opposite to the ink layer using a roll coater. lt/n? A recording medium for thermal transfer was prepared by coating.

Example 2 A coating solution consisting of 10 parts of sodium chloride, 5 parts of polyvinyl alcohol, and 100 parts of water was placed on a 6μ polyester film. Fl/m" was coated, and then a hot melt ink was applied with a roll coater of 52/-.Furthermore, the surface of the polyester film opposite to the ink layer was coated with 0.3 t/- of a 15-timethanol solution of nitrocellulose. A heat transfer recording medium was prepared by coating and providing a heat-resistant layer.

Example 3 The following composition was applied on a 6μ polyester film. Carbon black 14chi A- Dyeing Department 5 Toner 3% Paraffin wax 33% Carnauba wax 22% Montan Wax Section 10 Rice wax 5% Oligostyrene sulfonate (Conductive material) 8chi 5.5t/n? Coated.

Example 4 The hot melt ink (wax-type carbon ink) described in Example 1 was applied on 6 μm polyester at 5.0 f/rI?
On the side opposite to the ink layer, apply 0.5 t/- of a paint consisting of 10 parts by weight of a 50% xylene solution of silicone resin, 11 parts by weight of organic acid metal salt (curing agent), 11 parts by weight of zinc oxide (conductive material). A thermal transfer recording medium was prepared by coating.

Comparative Example = 8- A thermal transfer recording medium for comparison was prepared by applying the hot bath melting ink described in Example 1 onto a 6μ polyester film.

Regarding the thermal transfer recording media obtained in Examples 1 to 4 and Comparative Examples, A4t
500 sheets of paper were run to evaluate the separation from the transfer paper and the runnability in thermal fac. The results are shown in the table below.

0: Good ×: Unusable Effect of the invention The present invention is a recording medium for thermal transfer containing a tetraelectric material, which eliminates troubles caused by static electricity.
There is no possibility of peeling errors between the donor film and transfer paper or wrapping around the single-feed roller.

[Brief explanation of drawings]

1 to 5 are sectional views of embodiments of the thermal transfer recording medium of the present invention, respectively. Symbols in the figure: 1...Base material; 2...4 electrically conductive material layer; 3...thermal melt ink layer; 4...4 ink layer containing electrically conductive material; 5...
Heat-resistant material layer. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A recording medium for thermal transfer, comprising a heat fr4 fusible ink layer provided on a base material and containing a conductive material. 2. The thermal transfer recording medium according to claim 1, wherein the conductive material is provided in a layered manner on the opposite side of the base material from the heat-melting ink layer. 3. The thermal transfer recording medium according to claim 1, wherein the conductive material is provided in a layered manner between the base material and the hot bath meltable ink layer. 4. The thermal transfer recording medium according to claim 1, wherein the conductive material is contained in the heat-melting ink layer. 5. The thermal transfer recording medium according to claim 1, wherein the layer containing a conductive material in a heat-resistant material is provided on the opposite side of the base material from the heat-melting ink layer.