JPS6094391A - Thermal transfer recording medium - Google Patents

Abstract

PURPOSE:To suppress the occurrence of sticking phenomenon by providing a thermally transferable color layer on one side of a film supporter and also a backing layer containing a resin and a fluoro compound having a softening point to melting point of 150 deg.C or less on the other side of the supporter. CONSTITUTION:A coating liquid containing a colorant selected from well-known pigments or dyes is coated on one side of a resin film of a thickness of 3-15mum and dried to form a thermally transferable color layer of a thickness of 2-5mum. An another coating liquid prepared by dispersing a composition consisting of 50-99.9pts.wt. a resin and 0.1-50pts.wt. a fluoro compound having a softening or melting point of 150 deg.C or less into an adequate solvent is coated on the other side of the resin film and dried to form a backing layer of a thickness of 0.03- 2.0mum to obtain a thermal transfer recording medium. The fluoro compound used includes trifluorochloroethylene low polymer, fluoro compounds of higher amides, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a thermal transfer recording medium, and more particularly to a thermal transfer recording medium that can prevent the sticking phenomenon from occurring.

[Prior Art] In a thermal transfer recording medium using a polymer film such as a polyethylene terephthalate film as a film support, a part of the film support is melted and fused to the heating head by the heating head heated during recording. There is.

This phenomenon is called a sticking phenomenon, and it significantly deteriorates the recording quality and eventually causes the film support to become stuck to the heating head, making it impossible to feed the thermal transfer recording medium.

In order to prevent this sticking phenomenon, it is possible to use paper with excellent heat resistance such as condenser paper for the film support, but if such paper is used, heat conduction from the heating head is poor, so the heating The power applied to the head must be increased, which has the disadvantage of significantly shortening the life of the heating end.

On the other hand, as a technique for preventing the stinking phenomenon, there is a technique using a backing layer. For example, JP-A-55-746
Publication No. 7 proposes providing a protective film such as silicone resin on the film support, but since the friction with the heating head is large, some parts of the heating head may wear out during long-term recording. It has the disadvantage of being In addition, JP-A-57
-129789 proposes providing a resin layer containing a surfactant or organic salt that is solid or semi-solid at room temperature on a film support, but the resin layer absorbs water during humid seasons such as the rainy season. As a result, so-called stickiness occurs and the heating head becomes extremely dirty.

[Object of the Invention] The present invention has been made in view of the above points, and it not only effectively suppresses the occurrence of the sticking phenomenon, but also prevents debris from adhering to the heating head and prevents the heating head from being worn out. It is an object of the present invention to provide a thermal transfer recording medium that does not adversely affect a heating head.

Another object of the present invention is to provide a thermal transfer recording medium in which the backing layer does not harden or cause a blocking phenomenon when the thermal transfer recording medium is wound up during its manufacture.

Other objects of the invention will become apparent from the following description of the specification.

[Summary of the Invention] As a result of intensive research, the present inventor has discovered that in a thermal transfer recording medium having a heat-sensitive transferable colorant layer on one side of a film support and a backing layer on the other side, the backing layer is It has been discovered that the above object can be achieved by containing a resin and a fluorine compound having a softening point or melting point of 150° C. or lower, leading to the present invention.

That is, the present inventor believes that in order to prevent the sticking phenomenon, it is necessary to improve heat resistance by applying a banking layer,
They discovered that means for improving slipperiness are more effective than employing means for imparting matte properties, leading to the completion of the present invention.

[Structure of the invention] The present invention will be explained in more detail below.

The basic structure of the thermal transfer recording medium of the present invention is that it has at least a coloring material layer on the upper surface of a film support and at least a backing layer on its lower surface.

The backing layer in the present invention contains at least one resin and a fluorine compound.

As the resin of the present invention, known resin components may be used without particular limitation. Specific examples thereof include cellulose metal conductors such as polyvinyl acetate, polyvinyl butyral, polyvinyl chloride, polyvinylidene chloride, vinyl acetate-ethylene copolymer, ethyl cellulose, acetic acid sesylcetate, butylene acetate cellulose, and nitrocellulose. , epoxy resin, phenol resin, melamine resin, urea resin, silicone resin, fluororesin, polycarbonate, polyethylene, polyester resin, polyether, polypropylene, polyamide, styrene-maleic acid resin, polyurethane resin, polyvinyl alcohol, petroleum resin, etc. can be mentioned. More preferred are polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, etc., which are highly compatible with the fluorine compound of the present invention.

The fluorine compound used in the present invention is a compound having at least one fluorine atom, and has a softening point (measured by the ring and ball method) or a melting point (measured by the purlin MPJ-2 type) of 150° C. or lower. Examples include fluorine resin low polymers (molecular i: 5,000 or less) such as trifluorochlorinated ethylene low polymers and tetrafluoroethylene low polymers, and fluorine compounds such as higher amides. Examples include perfluorooctyl stearate, perfluorostearic acid, perfluorostearamide, perfluoropalmityl alcohol, difluorinated octyl phthalate, and the like.

The fluorine compound of the present invention can also be obtained from commercial products, such as Guyfroyl #20, Guyfroil #1150, Guyfroyl #110.
0 (manufactured by Daikin Industries), etc.

As mentioned above, the fluorine compound of the present invention has a softening point or melting point of 150° C. or lower, and only then can the object of the present invention be achieved. Fluorine compounds other than those of the present invention, that is, fluorine compounds whose softening point or melting point exceeds 150°C, can prevent the sticking phenomenon by improving heat resistance, but because of the large friction with the heating head, the heating head may wear out during long-term recording. Therefore, it is excluded from the present invention.

The composition ratio in the backing layer of the present invention is not limited, but the total amount of the backing layer is 100% (weight%, the same hereinafter).
As, resin 50-98.9%, more preferably 70-98.9%
99%, the fluorine compound may be 0.1 to 50%, more preferably 1 to 30%, and the thickness of the backing layer is also 0.03%.
~2.0 #L, more preferably 0.1~0.5 #L. Note that the backing layer of the present invention may contain components other than the fluorine compound and resin of the present invention.

The film support used in the present invention may be any resin film with excellent surface smoothness and dimensional stability, such as polyethylene terephthalate film, polyimide film,
Resin films such as polycarbonate films (polymer,
Examples thereof include copolymers and terpolymers. The thickness of these film supports is not limited, but is preferably about 3 to 15 g. These supports are subjected to treatments such as corona discharge, glow discharge, other electronic impact flame treatments, ultraviolet irradiation, oxidation treatment, saponification treatment, and roughening on the surface of the support in order to improve the adhesion of the backing layer of the present invention. It may be applied, or it may be undercoated.

The backing layer of the present invention may be coated on the film support by any method, such as hot melt coating or solvent coating with a coating solution in which the backing layer composition is dispersed in an appropriate solvent. For coating, reverse roll coater method, extrusion coater method,
Any coating technique can be used, such as the gravure coater method or the wire coater method.

The coloring material layer of the present invention may be of any type known in the art, and may be of the so-called melt transfer type or of the sublimation (or vaporization) transfer type.

The coloring material layer of the present invention only needs to contain at least a coloring agent, and this coloring agent may be any pigment such as a known pigment or dye.

When the coloring material layer of the present invention is constructed as a melt-transfer type, the heat-melting substance may be contained in the coloring material layer of the present invention and may also be contained in an adjacent layer. Alternatively, it may have a layer structure in which it is not contained in the coloring material layer but is contained in a layer adjacent to the coloring material layer that is far from the film support. Further, the coloring material layer may be composed of two or more layers, or may have other layers such as a subbing layer and an intermediate layer.

In addition, regarding the preparation of the coloring material layer, such as the coating method of the coloring material layer and the types of additives, known techniques can be referred to.
The thickness of the coloring material layer of the present invention is also not limited, for example, 2 to 5.
It can be set to about 500 yen.

[Effects of the Invention] According to the present invention, in a heat-sensitive transfer recording medium having a heat-sensitive transferable colorant layer on one side of a film support and a backing layer on the other side, the backing layer is made of resin and has a softening point or melting point. Contains fluorine compounds below 150℃,
In particular, in a thermal transfer recording medium provided with a backing layer containing a fluorine compound other than the one according to the present invention, the heating head wears out when recording for a long time. Thermal transfer recording media can overcome this drawback as well.

[Example] Examples are given below, but the embodiments of the present invention are not limited thereto. In addition, "1 copy" used below means 1
Parts by weight.

Example 1 A heat-sensitive transferable coloring material layer composition having the following composition was coated on the upper surface of a polyester film support having a thickness of 6 pL using a wire and dried to obtain a coloring material layer having a thickness of 3.4 μl. .

[Coloring material layer composition]

Carnauba wax 40 parts Wax (Nisseki Microwax + 55) 40 parts Olive oil 5 parts Carbon black 15 parts Meanwhile, 2 parts of Guyfroil #20 (a fluorine compound manufactured by Daikin Industries, Ltd.) (softening point: 15°C or less) were dissolved in 100 parts of xylene. Solution (1) and 8 parts of vinyl chloride (80%), vinyl acetate copolymer (4z), polyvinyl alcohol (2.3%) tricopolymer (manufactured by VAG HCUCC) were dissolved in 200 parts of 2-butanone. A solution (2) was prepared, and the solutions (2) and (2) were mixed to obtain a backing layer coating solution (2).

This coating solution (2) was applied to the lower surface of the support with a wire bar and dried to obtain a thermal transfer recording medium sample (2) having a backing layer with a thickness of 0.3 after drying.Is there any occurrence of 1° sticking phenomenon? For this, recording was performed using a thermal printer (a prototype machine equipped with a thin-film line thermal head with a heating element density of 8 dots/mm) under the conditions that the applied power per heating element was 0.6 W and the application time was 2 milliseconds. It was observed whether the thermal transfer recording medium could be driven smoothly.

The stain on the heating head was observed with a magnifying glass after recording. On the other hand, the blocking phenomenon was confirmed by stacking three heat-sensitive transfer recording media samples facing the same direction, pressing them with a pressure of 600 g/c♂, leaving them for one week, and then peeling off each sample to ensure that the coloring material layer supported It was determined whether it had spread to the body by observing it with a 5x magnifying glass. As a result, no sticking phenomenon was observed, the heating head was driven smoothly, and a dye transfer image with no uneven printing was obtained. Further, no dirt was observed on the heating head.

Comparative Example 1 A comparative thermal transfer recording medium sample (2) was prepared in the same manner as in Example 1 except that liquid paraffin was used instead of Guyfroil+120.

This sample (2) was tested in the same manner as in Example 1 for the presence or absence of the stinking phenomenon, the presence of dirt on the heating head, and the presence or absence of the pronking phenomenon. As a result, printing unevenness was observed in the dye transfer image, and staining of the heating head was also observed.

Comparative Example 2 A comparative thermal transfer recording medium sample (2) was obtained in the same manner as in Example 1 except that polytetrafluoroethylene (softening point: 320° C.) was used instead of Guyfroil #20.

This sample (1) was tested in the same manner as in Example 1 for the presence or absence of the sticking phenomenon, the presence of dirt on the heating head, and the presence or absence of the pronking phenomenon. As a result, a blocking phenomenon was observed.

Claims (1)

[Claims] In a heat-sensitive transfer recording medium having a heat-sensitive transferable colorant layer on one side of a film support and a backing layer on the other side, the backing layer is made of a resin and has a softening point or melting point of 150°.
A thermal transfer recording medium characterized by containing a fluorine compound of C or less.