JPS6235885A - Thermal transfer recording medium - Google Patents

Abstract

PURPOSE:To provide a thermal transfer recording medium having an antisticking layer which does not abrade a head, by providing a heat-fusible ink layer on the face side of a base consisting of a plastic film and providing a layer comprising a silicone oil (which is solid at normal temperature) as a main constituent on the back side of the base. CONSTITUTION:The heat-fusible ink layer is provided on the face side of the base consisting of a plastic film, and the layer comprising a silicone oil which is solid at normal temperature as a main constituent is provided on the back side of the base. The base consists of a film of a plastic such as a polyester. The silicone oil used as a material for forming the anti-sticking layer is a modified silicone oil having a melting point of not lower than 45 deg.C. The ink layer is heat-fusible colored ink layer, wherein a coloring agent is, for example, carbon black for black color, and a wax is, for example, paraffin wax. A resin such as an ethylene-vinyl acetate compolymer, a rosin derivative, a petroleum resin and a syrene resin is used, and an oil such as a mineral oil and a vegetable oil is used.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD This invention relates to thermal transfer recording media, such as thermal transfer ribbons.

Conventional technology When a plastic film such as a polyester film is used as the base material of a thermal transfer recording medium, the surface of the film may rise above its melting point due to the heat of the thermal head, causing it to stick to the thermal head and lowering the recording quality. If the adhesion is severe, the GT material may become perforated or cut, making it impossible to record. This phenomenon is called the stick phenomenon.

To prevent stickiness, JP-A-54-143152, JP-A-55-7467 and JP-A-59-1486 are recommended.
No. 97, etc., the formation of a metal thin film layer, the formation of a heat-resistant protective film,
A method of coating or impregnating with wax or a liquid or paste-like substance at room temperature has been proposed.

Although these methods are effective in preventing stickiness, they are expensive, cause static electricity to occur, and cause poor ribbon running.
There have been problems in that handling during processing becomes difficult and that the liquid material transfers to the heat-melting V1 ink, deteriorating the recording quality.

In addition, in Japanese Patent Publication No. 5 (1979) (No. 3-155794), a stick prevention layer consisting of a highly slippery inorganic pigment and a thermosetting, highly softening, or high softening point resin material is provided on one side of the Plus Book film. be.

Japanese Patent Publication No. 57-74195 discloses a method in which a stick prevention layer selected from a silicon oxide A layer or a three-dimensional (5-layer) polyfunctional (meth)acrylate layer is provided on one side of a plastic film.

However, these have the disadvantage that the anti-stick layer has high hardness because it is processed with resin, which causes a large amount of wear on the head and shortens the life of the head.

Purpose: The present invention eliminates the above-mentioned drawbacks of the prior art and provides a thermal roller 71 with a stick prevention layer that prevents the head from wearing out.
The aim is to provide recording media1.

Structure The structure of the present invention to achieve the above object is that a heat-melting ink layer is provided on the surface of a base material made of a plastic film, and a layer mainly composed of silicone oil, which is solid at room temperature, is provided on the back surface. It is a recording medium.

To explain the above structure specifically, the base material is polyester, borisdylene, polyethylene, polypropylene,
Plastic films coated with vinyl chloride, vinylidene chloride, and polycarbonate are used.

The silicone oil that is solid at room temperature and used as a material for the anti-stick layer includes modified silicone oils having a melting point of 45° C. or higher, such as higher fatty acid-modified silicone oil and carnauba-modified silicone oil.

As the heat-fusible ink layer in a3 of this invention, a conventionally known heat-fusible @color ink layer can be used as is, and b is not particularly limited. These consist of colorants, waxes, resins, oils, etc.

As the coloring agent, for example, in the case of black, carbon black, oil black, etc. can be used.

Examples of waxes include paraffin wax, carnauba wax, microcrystalline wax, montan wax, low molecular weight polyethylene wax, wood wax,
Beeswax, rice wax, etc. are used.

As the resin, ethylene vinyl acetate copolymer, rosin derivative, petroleum resin, styrene resin, etc. are used.

As the oil, mineral oil, vegetable oil, etc. are used.

Hereinafter, the present invention will be specifically explained using examples.

Example A carnauba-modified silicone oil (melting point: 80 DEG C.) was applied to a polyester film having a thickness of 6 microns using a hot melt coater to a thickness of 1 micron.

Next, a heat-melting ink (melting point: 68° C.) was applied to the opposite side to a thickness of 4 μm to prepare a thermal transfer ribbon.

Comparative Example 1 A thermal transfer ribbon was prepared by coating a polyester film with a thickness of 6 μm with a heat-melting ink in 7 layers of 4 μm using a melt coater.

Rule 2: Approximately 1 g/m 2 of silicone oil (KF-96, manufactured by Shin-Etsu Chemical) was applied to the back surface of the thermal transfer ribbon of Comparative Example 1.

The thermal transfer ribbons produced in the above actual examples and comparative examples were wrapped around a ribbon core, and a printing test was conducted using the maximum applied energy (approximately 0.9 mJ depending on the internal variable resistor) of the thermal transfer printer TP-2220 manufactured by Ricoh Co., Ltd. I did it. The results of this printing test are shown in the table below.

In the examples, only silicone oil that is solid at room temperature was used, but a small amount of oil, an inorganic pigment, and a resin may be added individually or in amounts of two or more.

Effects As is clear from the above explanation, the effects of the thermal transfer recording medium of the present invention are summarized as follows.

1. It can prevent the stick phenomenon of thermal head.

2. Silicone oil does not transfer to heat-melting ink, so recording quality is not affected.

3. The hardness of the silicone oil layer is low, so the head will not wear out.

4. Low cost.

Claims (2)

[Claims] (1) A thermal transfer recording medium characterized in that a heat-melting ink layer is provided on the surface of a base material made of a plastic film, and a layer mainly composed of silicone oil, which is solid at room temperature, is provided on the back surface. (2) The thermal transfer recording medium according to claim (1), wherein the silicone oil that is solid at room temperature has a melting point of 45° C. or higher.