JPS62279984A - Thermal transfer type recording material - Google Patents

Abstract

PURPOSE:To obtain favorable printing characteristics even when using an ordinary paper as a recording paper, by incorporating a lanolin fatty acid into a heat-fusible ink. CONSTITUTION:A lanolin fatty acideis incorporated into a heat-fusible ink layer, in a thermal transfer type recording material comprising at least a base and the heat-fusible ink layer provlded thereon. The ink layer preferably comprises, per 100 parts of total weight, 30-80 parts of a heat-fusible binder, 3-40 parts of a softener, 5-20 parts of a coloring agent and 2-10 parts of the lanolin fatty acid, and small amounts of an antioxidant, a dispersing agent, a lubricant or the like may be added thereto. To actually obtain the thermal transfer type recording material, the constituents are treated by a known mixing and dispersing device such as a three-roll mill and an attritor to prepare a heat-fusible ink, and the ink is applied, either as it is or after being dispersed to an appropriate concentration, to the base in a thickness of 2-15 mum by a coating method such as a roll coating method.

Description

Detailed Description of the Invention V. Detailed Description of the Invention (Field of Industrial Application) The present invention is used in a thermal transfer type recording device such as a thermal printer. The present invention relates to a thermal transfer recording material.

(Prior art and its problems) In recent years, with the rapid development of the information industry, various information processing systems have appeared, and recording methods and devices suitable for each information processing system have not been developed. ing.

One of the known recording methods is one in which a recording paper and a thermal transfer layer of a thermal transfer type recording material are brought into contact with each other.
Pressure is applied, a thermal head is brought into contact with the back surface of the base material, a pulsed electrical signal is sent to the head, and the head is heated to transfer the heat-fusible ink on the thermal transfer layer at the heated location to print. There are thermal transfer recording methods, and these methods have recently become increasingly popular because the devices used are lightweight, compact, noiseless, and have excellent operability and maintainability.

However, since the 1-line method basically uses a printing method that involves contact between the recording paper and the thermal transfer recording material, it is possible to print on highly smooth paper without any problems, but on general paper (high-quality paper with a very uneven surface) It is extremely difficult to print on paper (paper, paper for dry copying machines), which naturally has the disadvantage of requiring the use of specialized highly smooth paper.

(Means for Solving the Problems) The present invention was developed in view of the above-mentioned circumstances, and is the result of intensive studies to obtain good printing characteristics even on general paper without using special highly smooth paper. discovered that a heat-melt ink containing lanolin fatty acid was optimal.

This invention has finally been 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 gist of the heat-sensitive transfer recording material is that the heat-melting ink layer contains lanolin fatty acid.

The present invention will be explained in detail below.

The base material used in the present invention is paper such as glassine paper or capacitor paper, or plastics such as polyester, polycarbonate, polyimide, polyamide, etc., and the heat-melt ink layer provided on the base material is sex binder.

Softener 2 Coloring material etc. are the main components.

M [Tactile binders include waxes such as carnauba wax, wood wax, beeswax, ceresin wax, ester wax, polyethylene wax, stearic acid, palmitic acid, lauric acid, aluminum stearate,
Higher fatty acids such as zinc valmitate and glycerol monohydroxystearate, or their metal salts, derivatives such as esters, etc. are used singly or in combination of two or more.

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

Polystyrene, styrene-butadiene copolymer.

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

Colorants include black pigments such as various carbon blacks, yellow pigments such as benzidine yellow, ha/za yellow, and zinc yellow, magenta pigments such as permanent red 4R, rhodamine lake P, and brilliant cation 6B, Victoria blue lake, and phthalocyanine. blue.

A cyan pigment such as Fast Sky Blue is used.

Lanolin fatty acids, which are a feature of the present invention, are fatty acids obtained by saponifying and decomposing lanolin to remove unsaponifiables, and include various normal fatty acids, ino fatty acids, antiiso fatty acids,
It consists of a mixture of α-hydroxy fatty acids, α-hydroxy isofatty acids, and unsaturated fatty acids, and has a white to pale yellow wax-like appearance.

Each component in the heat-fusible ink layer has a total weight of t100
It is preferable to use 30 to 80 parts of the heat-melting binder, 3 to 40 parts of the softening material, 9 parts of the coloring material, 5 to 20 parts of the coloring material, and 2 to 10 parts of the norin fatty acid, and a small amount of the antioxidant. Dispersants, lubricants, etc. may 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 machine such as a heated triple roll or an attritor, and the ink is dispersed directly or at an appropriate concentration onto a base material, for example. The coating thickness varies from 2 to 15 μm depending on the coating method, such as roll coating, gravure coating, screen coating/f method, fountain coating, etc.
It can be obtained by coating it so that it becomes m.

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) In the present invention, in particular, since the heat-melting ink layer contains lanolin fatty acid, the acid value of the lanolin fatty acid is 160.
-200, which improves the dispersibility of the pigment, and furthermore, the crystallization prevention effect of lanolin fatty acids prevents the crystallization of the wax component used in the heat-melting binder, resulting in fine and uniform heat-melting. Therefore, it is thought that good printing characteristics can be obtained even on ordinary paper with a highly uneven surface without using special highly smooth paper.

(Example) The present invention will be explained in more detail below based on examples.

Example 1 Carbon black (Raven ◆1035. Manufactured by Colonpian Carbon Co., Ltd.) 100 parts by weight Paraffin (mp60-65 tff) 500 y Carnauba wax (manufactured by Noda Fuchs) 150 tr petroleum m
m< Escolette φ5380.

(Manufactured by Exxon Chemical Co., Ltd.) 200 tt Silanone fatty acid 50 Each of the above ingredients was heated and dispersed using a triple roll to prepare a heat-melting ink, and this was coated on a 6 μm thick polyester film by gravure coating to a coating thickness of 5 μm. A heat-sensitive transfer type recording material was obtained.

Example 2 Carbon black 120 parts by weight Paraffin (mp60-65υ) 500 tt Carnauba wax 130 〃Ethylene-vinyl acetate copolymer (Evaflex 210.Mitsui Depond Polychemical ■Made in Japan 80〃Lanolin fatty acid 50 〃Dispersant ('Sol's Purse 1
7000° manufactured by IOI Japan Co., Ltd.) 2o A heat-melting ink was prepared using the above components 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.

Example 3 The hot melt ink prepared in Example 1 was heated to 100υ, and an aromatic mixed solvent (Vegasol R, -100,
After adding 4000 parts by weight of Mopil Oil ■ and stirring,
This was allowed to cool to obtain a fine dispersion of this ink. Next, this fine dispersion was applied onto a 6 μm thick polyester film by gravure coating and dried at 85 μm to give a coating thickness of 5 μm to obtain a heat-sensitive transfer type recording material.

Comparative Example 1.2 was prepared in the same manner as in Example 1.2 except that lanolin fatty acid was removed.
It was set as 2.

(Effect of the invention) Examples 1 to 3 above. Regarding the thermal transfer type recording material obtained in Comparative Example 1.2, Hamanasu paper (highly smooth paper 1) was used as the recording paper.
(manufactured by Honshu Paper Industries, Ltd.), Xerox L paper (dry copying paper, manufactured by Fuji Xerox, Ltd.).

High quality paper (JIsp32o 1) was used and the printing characteristics of each were investigated using printers (Retacon and Bentel), and the results shown in the following table were obtained.

*1 Print clarity...O: Clear, Δ: Slightly unclear, ×
: It was made unclear.

*2 Print reflection density: Sakura densitometer PDA-65 was used as a measuring device.

As is clear from the above, the heat-sensitive transfer recording material of the present invention allows clear, high-density printing even on patterned paper (high-quality paper, dry copying paper, etc.) without using special high-smooth paper. It is possible to print.

Claims (1)

[Claims] 1. A heat-sensitive transfer recording material comprising at least a base material and a heat-fusible ink layer provided on the base material, wherein the heat-fusible ink layer contains lanolin fatty acid.