JPS63268689A - Thermal transfer type recording material - Google Patents

Abstract

PURPOSE:To enable clear printing even on a paper having low smoothness, by incorporating at least one aluminum complex soap into a heat-fusible ink layer. CONSTITUTION:A base may be a paper such as glassine paper and condenser paper or a plastic such as a polyester or a polycarbonate, whereas a heat-fusible ink layer on the base comprises a heat-fusible binder, a softener, a coloring agent and the like as main constituents. Aluminum complex soap may be, for example, Olive AOS (trade name) comprising aluminum oxide stearate associated in a ring form or Olive AOO (trade name) comprising aluminum oxide octate associated in a ring form. At least one of such aluminum complex soaps is used in an amount of 0.5-10pts.wt. per 100pts.wt. of the ink. By such constitution, the efficiency of transfer of the ink is enhanced, and clear printing can be conducted even on a paper having low smoothness.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thermal transfer recording material used in a thermal transfer recording device such as a thermal printer.

(Prior Art) In recent years, with the rapid development of the m-information industry, various information processing systems have appeared, and recording methods and devices suitable for each information processing system have been developed.

It is quiet, noiseless, and has excellent operability and maintainability, and has been increasingly used in recent years.

This method involves bringing the recording paper into contact with the thermal transfer layer of the thermal transfer type recording material, applying pressure, bringing the thermal head into contact with the back surface of the base material, and sending a pulsed electrical signal to the head to heat the head. Printing is performed by transferring the heat-melting ink in the heat transfer layer at the heated location.

Heat-melt inks used in such heat-sensitive transfer recording materials have conventionally used wax as a main component as a heat-melt binder in order to cause a sharp phase change between solid-liquid-solid during thermal transfer. Its ingredients included pigments and dyes as colorants, and oils and synthetic resins as softeners.

(Problems to be Solved by the Invention) However, as mentioned above, since the main component of conventional hot-melt inks is wax, their cohesive force is weak when melted, and therefore paper with a rough surface (low When printed on smooth paper, the problem was that the image was unclear.

This is because the diameter and depth of the pores on the paper surface are large in low smooth paper.
This is because the contact area with the ink during transfer is small, so if the ink has a low cohesive force, the non-contact area will remain on the thermal transfer recording material and will not be transferred to the paper.
If you simply increase the ratio of synthetic resin components to increase cohesive force, the adhesiveness of the ink will increase, resulting in poor peeling between the base material of the thermal transfer recording material and the ink during transfer, and the melting point and softening of the ink. Since the point increases, it cannot be used with conventional thermal heads.

(Means for solving problems) The present invention has been made in view of the above circumstances.

The result of intensive research to obtain good printing characteristics not only on highly smooth paper but also on low smooth paper.

It was discovered that a hot-melt ink containing aluminum complex soap, which is a kind of gelling agent, was optimal, and the present invention was finally completed.

That is, the present invention provides a heat-sensitive transfer recording material comprising at least a base material and a heat-melting ink layer provided on the base material,
The heat-melting ink layer is a heat-sensitive transfer recording material characterized in that (1) it contains one or more types of aluminum complex soap.

', Hereinafter, the present invention will be described in detail.

The base material used in the present invention is paper such as glassine paper or capacitor paper, or plastic such as polyester, polycarbonate, polyimide, or polyamide.
The main components of the heat-melting ink layer provided on the base material include a heat-melting binder, a soft material 9 and a coloring material.

As the heat-melting binder, carnauba wax, wood wax, tlotsu, ceresin wax, ester wax,
Waxes such as polyethylene wax, stearic acid,
Higher fatty acids such as palmitic acid, lauric acid, aluminum stearate, zinc palmitate, glycerol molybdenum, and nohydroxystearate, or their metal salts, derivatives such as esters, etc. are used singly or in combination of two or more thereof.

1 Petroleum resin and polyvinyl acetate are used as flexible materials.

Folystyrene, styrene-butadiene copolymer.

Examples include resins such as acrylic resins and ethylene-vinyl acetate copolymers, and oils such as mineral oils and vegetable oils.

Further, as the coloring material, black materials such as carbon black, nigrosine, lamp black, and sudan black can be mentioned, but it is of course possible to use materials of other colors.

The aluminum complex soap used in the present invention has the general formula 2 [A-0-Al=0]3n (n=1
(integer greater than or equal to) (A-G-)1-+t-Co-, C-H
nt-C0-combined olive AO8, ``olive AOO'' in which aluminum oxide oftate is assembled in a ring shape
Olive AO8, which is sold under the trade name of (manufactured by Hope Pharmaceutical), Moa Ruga1, is particularly used in the present invention.
It is of course not limited to olive AOO, and may be synthesized by various methods. In addition, in terms of stability etc., n is 1 to 3. m is preferably 7 to 18.

These aluminum complex soaps can be used alone or in an appropriate mixture of two or more.

Therefore, the amount of other components used in the heat-melt ink layer is 50 to 50 parts of the heat-melt binder to 100 parts of the total weight.
80 parts, 3-25 parts of soft material.

It is preferable to use 5 to 15 parts of the colorant, and a small amount of an antioxidant, a dispersant, a lubricant, etc. may also be added.

How to actually obtain the thermal transfer type recording material of the present invention.

A heat-melting ink is prepared using a well-known mixing and dispersing machine such as a heated triple roll or attritor for each of the above ingredients,
Spread this directly or disperse it at an appropriate concentration on the base material.
For example, depending on the coating method such as roll coating method, gravure coating method, screen 7:l-f ink method, 7-aunt coating method, etc., the coating thickness may vary from 2 to 1 mm.
It is obtained by coating to a thickness of 5 μm.

In the present invention, it goes without saying that an intervening layer such as a release layer may be provided between the base material and the heat-fusible ink layer.

(Function) The above-mentioned aluminum complex soap contained in the heat-melting ink layer of the present invention is a well-known gelling agent, but the present invention claims that this aluminum complex soap has a gelling effect even when the wax is in a molten state. Based on this knowledge, it was applied to thermal transfer recording materials.

In other words, when wax is melted, the viscosity decreases rapidly and there is almost no cohesive force when melted, but aluminum complex soap has a gelling effect even when the wax is melted, preventing a sudden decrease in viscosity and increasing the cohesive force. This improves the ink transfer efficiency, making it possible to print clearly even on low-smooth paper.

(Example) Hereinafter, the present invention will be described in further detail based on nine examples.

Example 1 Carbon black (Ave'n 1255, manufactured by Columbian Carbon Co., Ltd.) 12 parts by weight Paraffin (
m p 60-65°C1 made by Noda Wax ■)
50 parts by weight carnauba wax (manufactured by Noda Wax ■) 20 parts by weight petroleum resin (
Escolets 5380° manufactured by Exxon Chemical Co., Ltd.) 15 parts by weight Aluminum complex soap (Olive AO8, manufactured by Hope Pharmaceutical ■) 3 parts by weight Dispersion (Norspers 17000° manufactured by IOI Japan) 1.5 parts by weight Each of the above acids was added by three rolls. A heat-melting ink was prepared by heating and dispersing it, and it was coated onto a 6-μm-thick polyester film using a gravure coating method to a thickness of 5 μm.
A heat-sensitive transfer type recording material was obtained by applying the following coating.

Example 2 Carbon black 10 parts by weight Paraffin (mp 60-65°C) 60 parts by weight Carnauba wax 10 parts by weight Ethylene-vinyl acetate copolymer (Evaflex 310, manufactured by Mikata DuPont Polychemical ■) 12 parts by weight Aluminum complex 7 parts by weight of soap (Olive AOO, manufactured by Hope Pharmaceutical ■) 2 parts by weight of powder (Tsurusperse 17000) Example 1
A heat-melting ink was prepared in the same manner as in Example 1, and a heat-sensitive transfer recording material was obtained from it in the same manner as in Example 1.

Comparative example 1. 2 In Example 1.2, a thermal transfer type recording material was obtained in the same manner as in each Example except for each aluminum complex soap, and these were designated as Comparative Example 1.2.

(Effect of the invention) Examples 1 and 2 above. Regarding the thermal transfer recording material obtained in Comparative Example 1.2, thermal printer paper with a Beck smoothness of 200 seconds, hammer mill pound paper with a Beck smoothness of 18 seconds, and Lancaster pound paper with a Beck smoothness of 4 seconds were used. printer(
When we investigated the printing characteristics of each type using a printing press (manufactured by Pentel Corporation), we obtained the results shown in the following table.

O: Very good with no omissions.

Δ: There is some omission.

×: There are many omissions.

As can be seen from the above table, according to the thermal transfer type recording material of the present invention, clear printing is possible not only on paper specifically for thermal printers but also on low-smooth paper.

Claims (1)

[Claims] A heat-sensitive transfer recording material comprising at least a base material and a heat-melt ink layer provided on the base material, characterized in that the heat-melt ink layer contains one or more types of aluminum complex soap. A thermal transfer recording material.