JPH0345392A - Thermal recording transfer material - 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 a thermal ink ribbon for printers, a thermal ink ribbon for word processors, a thermal ink ribbon for facsimile, and the like.

[Conventional technology]

In recent years, thermal transfer recording methods have come to be widely used in recording devices such as facsimile machines, printers, word processors, and the like.

This method has advantages in that the equipment used is lightweight, compact, noiseless, and easy to operate and maintain, and it also does not require colored processed paper. It also has advantages in terms of recording media, such as excellent durability of recorded images.

Conventionally, this heat-sensitive recording method uses a heat-sensitive recording transfer body formed by coating a heat-sensitive functional ink on one side of a film-like base made of polyethylene terephthalate, and the ink layer surface of this heat-sensitive recording transfer body is attached to the recording material. The recording function is achieved by stacking the ink layers so that they are in contact with each other and applying heat from the other side of the thermal recording transfer body using a thermal head to transfer the melted or sublimated ink layer to the recording material. .

[Problem to be solved by the invention]

When heat is supplied from the opposite side of the heat-sensitive recording transfer body to the ink layer in this way, the film base itself becomes high temperature.
When going through the process of melting and assimilation, a sticking phenomenon may occur that makes it impossible for the heat-sensitive recording transfer member to run, and the film base may undergo heat shrinkage deformation, making it impossible for the heat-sensitive recording transfer member to run. It is possible, and it is a problem.

In order to prevent this phenomenon, methods of providing a heat-resistant protective layer or a lubricating layer on the film substrate are being considered;
There is a problem with the heat resistance of the film substrate itself, and it is not a fundamental solution, and its effects are not satisfactory.

An object of the present invention is to provide a heat-sensitive recording transfer member that does not cause sticking phenomenon, thermal shrinkage of the film, etc. in its heat-sensitive recording function.

[Means to solve the problem]

As a result of intensive research to solve the above-mentioned problems, the inventors of the present invention found that the sticking phenomenon and heat shrinkage phenomenon of thermal recording transfer materials are caused by problems with the film base material itself, As a result of our search for a film substrate that has a higher glass transition point than polyethylene terephthalate resin and maintains flexibility as a film substrate, we found that
We have arrived at the present invention.

That is, the present invention is a heat-sensitive recording transfer material having a heat-sensitive functional ink layer on one side of a film base made of a composition mainly composed of polyethylene naphthalate.

The thickness of the film base is preferably in the range of 1 to 20 μm.

This film substrate mainly composed of polyethylene naphthalate has a glass transition point higher than that of conventionally used polyethylene terephthalate 1-(PET) by 40°C or more.
]-13°C, and the continuous usable temperature is 155°C, which is 35°C or more higher, and there is no stick phenomenon or thermal shrinkage of the film, and smooth thermal recording transfer can be performed.

Next, a more detailed explanation will be given with reference to the drawings. FIG. 1 is a cross-sectional view during thermal recording transfer. Heat from the thermal head 1 is supplied to the heat-sensitive functional ink layer 3 through the film base 2, and the ink is melted or sublimated and transferred to the recording medium 4. The heat-sensitive functional ink layer 3 is made up of a heat-sensitive carrier agent, a binder, and the like in addition to the coloring material.

When the film base 2 has a thickness of 20 μm'Hi, heat cannot be sufficiently transferred to the ink layer, and the ink layer does not melt sufficiently, making it impossible to obtain good results.

Further, a film base 2 having a thickness of less than 1 μm is not suitable as it does not have sufficient mechanical strength and heat resistance strength as a heat-sensitive recording transfer member.

The film base is made of a resin whose main component is polyethylene naphthalate, mixed with inorganic fillers with heat resistance or good thermal conductivity such as alumina, titanium oxide, calcium carbonate, and graphite. You can. Also, those in which a metal film or a lubricating substance is attached to the surface 6 of the film base facing the thermal head 1 to improve heat resistance and stick prevention properties are also excellent as film-like materials.

〔Example〕

EXAMPLES The present invention will be explained in more detail with reference to Examples below, but it goes without saying that the present invention is not limited to these Examples.

The composition of heat-sensitive functional ink A used in this example is as follows.

(Part) (Part by weight) Carbon black 1-5 Petroleum resin
10 ethylene vinyl acetate copolymer
10 paraffin wax 65 total 1. OO(
Examples],) Heat-sensitive functional ink A was applied to a 4-μm-thick polyethylene naphthalate film manufactured by Teijin Corporation.

Using this heat-sensitive recording transfer body, heat-sensitive transfer recording was carried out on a recording body, TRW-7 manufactured by Jujo Paper Industries Co., Ltd., using a thermal printer under the following conditions.

Printer Toshiba JW90HX Rup.

Print Density MAX The evaluation results of stick resistance and heat shrinkage resistance at this time are shown in Table 1 together with the evaluation results for the transfer bodies of Example 2 and Comparative Examples 1 and 2 described later.

The evaluation criteria were: ◎Very good, ◯Good, △Slightly poor, and ×Poor.

(Example 2) Heat-sensitive functional ink A was applied to a 6-μm-thick polyethylene naphthalate film made by Teijin to a thickness of 4 μm, and silicone resin was further applied to a thickness of 0.1 μm to the other side that would be in contact with the thermal head. A heat-sensitive recording transfer body was obtained.

(Comparative Example 1) Heat-sensitive functional ink A was applied to a 4-μm-thick polyethylene terephthalate film manufactured by Teijin Co., Ltd. to obtain a heat-sensitive recording transfer member.

(Comparative Example 2) Heat-sensitive functional ink A was applied to one side of a Teijin polyethylene terephthalate film with a thickness of 6 μm to a thickness of 4 μm, and silicone resin was applied to a thickness of 0.1 μm on the other side that would be in contact with the thermal head. A heat-sensitive recording transfer body was prepared by applying the mixture in a thick layer.

(Table) [Effects of the Invention] As is clear from the results of the Examples, the heat-sensitive recording transfer material of the present invention uses a film mainly composed of polyethylene naphthalate as the film base, so that it does not suffer from sticking phenomenon or heat shrinkage phenomenon. It was possible to prevent this, and thermal recording transfer could be performed smoothly.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional elevational view during thermal recording transfer using a thermal recording device. 1...Thermal head, 2...Film base, 3...
Thermosensitive functional ink layer, 4... Recorded object, 5... Recorded object facing surface, 6... Thermal head facing surface.

Claims (1)

[Scope of Claims] 1. A heat-sensitive recording transfer material having a heat-sensitive functional ink layer on one side of a film base made of a composition mainly composed of polyethylene naphthalate. 2. The heat-sensitive recording transfer member according to claim 1, wherein the thickness of the film base is in the range of 1 to 20 μm.