JPS6179696A - Thermal transfer recording medium - Google Patents

Abstract

PURPOSE:To obtain a thermal transfer recording medium free from fouling by scratch and permitting clear printing by providing a specific heat-melting ink layer on a substrate. CONSTITUTION:A layer consisting of wax having a penetration of 5-20(25 deg.C), compatible resin to this wax and a coloring agent is provided on a substrate. Paraffin wax is used as a wax and those having a high penetration value and a low penetration value may be mixed to assure said penetration level. As compatible resin to wax, rosin of resin type and its derivative can be used and as a coloring agent, basic dyes or pigments can be employed. 56-90wt% of wax having a penetration of 5-20(25 deg.C), 5-35wt% of compatible resin to the wax and 10-40wt% of coloring agent are blended. Thus a clear printing free from fouling by scratch can be achieved on a paper.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a thermal transfer recording medium.

Conventional technology Recording methods using thermal transfer recording media include: 1) One-brying method, which uses a thermal transfer recording medium ribbon coated with heat-melting ink on a base material such as film, and takes only one recording. Type, ■Use a sheet or roll of thermal paper coated with hot acidic ink on the back side and a receiving paper, recording on the thermal paper and the receiving paper to which the heat-fusible ink has been transferred. There is a two-bright type that can record.

Problems to be Solved by the Invention In the one-blow type recording method, the thermal transfer recording medium and the receiving paper are rarely integrated as in the two-buoy type. Therefore, if the movement of the thermal transfer recording medium and the movement of the receiving paper are not at the same speed, the thermal dispersion ink surface of the thermal transfer recording medium and the surface of the receiving paper will be stuck together, and the surface of the receiving paper will become dirty. Occur.

The best way to improve this is to improve the conveyance system of the recording device, but due to the difference in the materials of the two, it is difficult to always feed at a constant speed in terms of mechanism and cost, and it is difficult for thermal transfer recording media to do so. There is a need for improvement.

For binding method 1 on the side of the thermal transfer recording medium, a resin-based thermofusible ink was used, but the rubbing stains were eliminated, but the print clarity was poor. .

In addition to resin-based heat-melting inks, wax-based and wax-based inks are also available.
There are two types of resin mixed systems.Wax systems generally have poor printing clarity and may cause small smudges, while wax/resin mixed systems vary depending on the amount of wax or resin. If there are many, wax-based products are being considered, but if there are many resin companies in Sorimachi, various studies have been conducted to show the characteristics of resin-based products, but it is still likely to cause scratches (I have not been able to obtain a product with good print clarity) .

The present invention mainly relates to this one-bright type, and aims to provide a heat-sensitive transfer recording medium that is free from scratches and has good print clarity.

In the present invention, '''C has the above-mentioned defects in the conventional heat-sensitive transfer recording medium, and the penetration is 5-20 (25C).
A layer consisting of wax, a resin attached to this wax, and a heat-melting ink whose main components are a coloring agent? : This problem was solved by providing a thermal transfer recording medium that is loaded onto a substrate. The penetration is measured according to JIS K2235 "Petroleum wax" 95.4.

Wax 1 & 1, for example, paraffin wax,
Microcrystalline wax l [It doesn't matter which one you use. The wax that satisfies this penetration condition may be obtained by mixing a VC with a small penetration and a thick one with a thicker VC, for example.

Examples of yuzu oil that is compatible with wax include resin-based jugeji, atactic i helipropylene, polyimbunalene,
Ethylene-vinyl acetate copolymer, dibutylene, etc. can be used.

Resin-based resin, 'c' is rosin and its derivatives, terpene resin, (aliphatic, aromatic, aliphatic/aromatic aliphatic, alicyclic) hydrocarbon resin, hydrogenated hydrocarbon resin, It is possible to use compounds such as coumaron and indene resin.

As a coloring agent, dyes and pigments such as ``c dye, basic base dye, neozapon dye, sashi 1 ten dye, sword-bon black lake red, alkali blue, and dark blue can be used.

Base material: polyester film, polypropylene,
Polycarbonate film, Doria cellulose film, nylon film, t-rophane, glassine paper,
For example, a material having a thickness of about 2 to 30 microns, such as capacitor paper, is used.

Further, it is preferable to use the film 2 which has been subjected to heat-resistant treatment.

The Enthusiastic Ink may optionally contain other ingredients, e.g.
It is also possible to cool animal oils, vegetable oils, surfactants, etc.

Hot-melt ink V process, preferably with a penetration of 5-20 (25
It contains 56-90% of the wax of C), 5-35% of stool fat compatible with this wax, and 10-40% of a coloring agent.

To form a heat bath-resistant layer on a substrate, for example,
Methods such as hot melt coating and wet coating can be used.

Effects of the Invention Thermal transfer recording medium of the present invention? When used, clear prints can be recorded on the receiving paper without any scratches or stains.

Example 1 Carnauba wax 30 M it 815, paraffin wax 45 liter amount ff1S (manufactured by Nippon Oil Company, product name 14
5 lower), Katana-Bon Black 15i Shigebe (Mitsubishi Chemical Corporation ■
The product, trade name, MA-1007, ethylene-vinyl resin 10-layer compound (manufactured by Mitsui Polychemistry, trade name, Evaflex $220) was heated in a heated ball mill for 6 hours at °C. 1, separated.

Is this coating treated with stick prevention treatment kA on a 3μ thick polyester film? : Applied to the surface without applying hot acidic ink layer? Formed.

When this was printed using a NEC# NIPIU20 printer, a clear image was obtained without any scratches or stains σ).

Example 2 Katana Lunaba Wax iU, 2ft part, Microcrystalline Wax 12.0 Den, ji (manufactured by Hiki Seiro@, - Product name, Himic I U 7 (1), Katana Bomb Black 4
．． 8 parts (manufactured by Mitsubishi Kasei Corporation, product name, MA-11J)
U), ethylene-vinyl acetate resin 3. O1 Remains (Mitsui Fusuchemistry@So, product name, Evaflexna 220),
Toluene (7υ) and Oi (weight part) were mixed and dispersed in a ball mill at 15 hours [4 minutes' CC].

Korimono y! When applied and printed on the same head as ``Fu4''rAl, the results were as good as in Example 1. Polystyrene resin that does not mix with wax (manufactured by Sanyo Kasei Kogyo, product name, Hymer 5T-95) 7 was used instead of EVAFLEX ≠ 220), and was prepared and printed in the same manner as IJ l. It was clear and had a rough finish, but there was some rubbing and staining.

Procedural amendment February 12, 1985

Claims (1)

[Claims] 1. A layer consisting of a heat-melting ink whose main components are wax with a penetration degree of 5-20 (25°C), a resin compatible with the wax, and a coloring agent is applied on a base material. A thermal transfer recording medium comprising: 2. The thermal transfer recording medium according to claim 1, wherein the heat-melting ink contains 56-90% by weight of the wax, 5-35% by weight of the resin, and 10-40% by weight of the colorant. 3. The thermal transfer recording medium according to claim 1 or 2, wherein the wax is at least one selected from paraffin wax and microcrystalline wax. 4. The wax-compatible resin is at least one selected from resin resins, atactic polypropylene, polyisobutylene, ethylene-vinyl acetate copolymers, and polybutylene, as claimed in claim 1. Or the thermal transfer recording medium of item 2. 5. The heat-sensitive transfer recording medium according to any one of claims 1 to 4, wherein the base material is a film subjected to heat-resistant treatment.