JPS623990A - Thermal transfer material - Google Patents

Abstract

PURPOSE:To obtain an excellent anti-sticking property and an excellent effect of preventing adhesion of scum to a contact-type thermal printing means, by a construction wherein a heat-resistant protective layer is divided into a plurality of recording regions and a plurality of cleaning regions so that a thermal recording means makes contact alternately with the recording regions and the cleaning regions. CONSTITUTION:A heat-fusible transfer layer 3 is provided on one side of a base 2, and at least the heat-resistant protective layer 4 is provided on the other side. the layer 4 comprises plural recording regions 5 consisting of a composition comprising at least an inorganic filler having an average particle diameter of not more than 5mum added to a binder resin in a ratio of 2-10wt%, and plural cleaning regions 6 consisting of a composition comprising an inorganic filler having an average particle diameter of 20-40mum added to a binder resin in a ratio of 50-150wt%. The regions 5, 6 are so disposed that a contact-type thermal recording means used for thermal recording makes contact alternately with the regions 5 and the regions 6. Accordingly, sticking is prevented from occurring, and adhesion of scum to the recording means will not occur even in continuous transfer.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a hot-melting heat-sensitive transfer material, and more particularly, it is capable of good thermal recording using a contact-type printing means using short-time high-temperature heating such as a thermal head. The present invention relates to a heat-sensitive transfer material that can be used for.

<Prior art and its problems> Conventionally, heat-melting technology is made of a composition in which a coloring agent is blended into a binder such as wax or thermoplastic resin on one side of a base material such as a plastic film or condenser paper. Heat-sensitive transfer materials having a transfer layer are known. In recent years, as the printing speed of such thermal transfer materials has become faster, the back side of the thermal transfer materials has been improved.

That is, the exposed plastic film may be heated above its melting point, causing the plastic film to melt to the marking device. Don't worry about the so-called [sticking phenomenon] occurring. Several proposals have been made to try to eliminate this "sticking phenomenon."

I will describe one typical example below.

m A heat-sensitive transfer material with a heat-resistant protective layer made of a thermosetting resin provided on one side of the base material.

This transfer material requires a heating process for curing when forming the protective layer, and furthermore, although the protective layer has a high melting point, the layer itself is brittle, which hinders smooth printing.

(11) A thermal transfer material provided with a protective layer formed by applying a composition consisting of a thermoplastic resin, a crosslinking agent, and a sliding adhesive onto one side of a base material and curing at room temperature.

In most cases, the back protective layer of this transfer material still has insufficient heat resistance, and if it is in contact with the thermal head for a long period of time (4=1~12), is deposited on the thermal head, and deposits are generated.
It has the disadvantage of being -. In order to eliminate this problem, it has been proposed to improve the heat resistance by mixing inorganic fillers such as talc, silica, mica, etc. into the above composition, but this approach has been proposed to improve heat resistance. In order to provide enough heat resistance to reduce adhesion, it is essential to add a considerable amount of adhesion.

This may cause roughening of the back protective layer.
Since it has a very large negative effect on the image quality, it cannot be considered a very effective method from the point of view of comprehensive evaluation of thermal transfer materials.

(Song 1-r1 & heat transfer mentioned in the notes) slide 1〆1
- In order to improve the protection, a protective layer consisting of a lubricant composition similar to that of 1iil with the addition of a lubricant agent was added.
Fro thermal transfer material.

The protective layer of this thermal transfer material does not cause states king, and at the table test stage, it was found that the protective layer was 1-
It can be said that it almost satisfies the required performance of 2. However, when a long lamp strike is performed, the transferred resin fuses onto the thermal head (contact type heat-sensitive recorder).

In this way, when deposits accumulate on the thermal head 7, it causes deterioration of printing quality. The purpose of the present invention is to provide a thermal transfer material that has excellent tear and stain resistance and contact type/J [1] excellent effect of preventing dust from adhering to thermal printing tools.

<Summary of the Invention> The present invention, which has been made to achieve the above objects, comprises forming at least a heat-melting transfer layer on one side of the base material and a heat-resistant protective layer on the other side, The heat-resistant protection 1<i is a plurality of recording areas made of a composition in which at least an inorganic filler having an average particle size of 5 μm or less is added to a binder resin in a proportion of 2 to 10% by weight.

The cleaning area is divided into a plurality of cleaning areas consisting of a composition in which an inorganic filler with an average particle size of 20 to 40μ is added to a binder resin at a proportion of 50 to 150% by weight, and each area is divided into This thermal recording material is characterized by the fact that the contact-type heating recording tools used during thermal recording are arranged so that they are in contact with each other. .

<Detailed description of the invention> The present invention will be described in detail below with reference to one drawing.

FIG. 1 schematically shows a thermal transfer material 11) according to the present invention, in which (2) is a base material, 13) is a heat-melting transfer layer, and (4) is a heat-sensitive transfer material.
is a heat-resistant protective layer.

The base material (2) has been conventionally used in this type of thermal transfer material. Polyester film, polycarbonate film, polyamide film, polyimide film, capacitor paper, Indian paper, metal foil, or any of the above-mentioned films and papers can be used.

A heat-melting transfer layer (formed on one side of the base material (2))
3) is for forming a desired transferred image by transferring a portion onto the transfer target by heating recording with a heating recording device (for example, a thermal head).

Similar to the heat-melting transfer layer of conventional thermal transfer materials, paraffin wax and microcrystal wax.

Polyethylene wax, secret 7), carnauba wax,
Rice wax, acrylic resin, polyester 1 fat,
It is formed from a composition containing polyamide resin, ethylene-vinyl acetate copolymer, etc. as the main binder, and coloring agents such as pigments and dyes.

In addition, the heat-resistant protective layer (4) formed on the other surface of the base material (2) is intended to improve the durable sticking property of the transfer material and the effect of preventing deposits on contact type heating recording tools. It is. As is clear from Figure 1, its specific configuration is divided into multiple recording areas (5) and multiple cleaning areas (6), and each area is a contact type used during thermal recording. The III thermal recording devices (7) are arranged in such a way that they are in alternate contact with each other. FIG. 2 is a perspective explanatory view of the arrangement of the recording area (5) and the cleaning area (6) in the heat-resistant protective layer (4).

The recording area (5) is talc with an average particle size of 5 μm or less.

Epo, xy(
TFT fat, silicone fat, phenolic tit fat.

Polyester resin, nitrocellulose resin, vinyl chloride-vinyl acetate copolymer, polyether resin.

It consists of a composition with a small amount added to a stone agent resin such as a polybutadiene resin.

On the other hand, the cleaning region is made of a composition in which an inorganic filler having an average particle size of 20 to 40 microns is added to the binder resin in a proportion of 50 to 150% by weight.

As mentioned above, for the same purpose as the present invention.

A heat-sensitive transfer material having a heat-resistant protective layer made of a resin composition containing an inorganic filler such as talc, silica, or mica on one side of a base material has been proposed. The inventor of the present invention studied a heat-sensitive transfer material having an inorganic filler in a heat-resistant protective layer, and obtained the following findings.

In other words, the more the amount of inorganic filler added to the heat-resistant protective layer increases, and the larger the particle size of the inorganic filler, the more the above-mentioned phenomenon of adhesion of debris to the thermal head will be reduced. .

It has also been found that when the filling amount and particle size of the added inorganic filler exceed a certain range, the thermal head has the ability to remove debris deposited on the thermal head.

In this way, by adding an inorganic filler, it is possible to reduce the adhesion of debris to the thermal head, but from the point of view of the printing performance of 5 units, that is, the image quality of 1 transferred image, it is possible to reduce the adhesion of debris to the thermal head. An increase in the amount added and the particle size are clearly disadvantageous.

According to the study results of the present inventor, the conditions for adding an inorganic filler that do not cause deterioration of print quality are an average particle size of 5μ or less and a filling amount of 2 to 10% by weight, but unfortunately within this range, , the phenomenon of residue adhesion to the thermal head cannot be eliminated.

Therefore, the inventor of the present invention achieved the desired object by providing the heat-resistant protective layer in the heat-sensitive transfer material with the composition and structure as described above. That is, in the recording area, the amount and particle size of the inorganic filler to be added are set within a range that does not cause deterioration of the image quality of the transferred image, and in the cleaning area, the amount and particle size of the inorganic filler to be added are set to a range that does not cause deterioration of the image quality of the transferred image. By arranging the areas so that a small amount of the deposited core resin can be removed, and in such a way that each area alternately contacts the contact-type heating recording device used during thermal recording.

The technical problem of supplying a thermal transfer material by performing thermal transfer while improving the stating resistance and the effect of preventing residue from adhering to a heating printing tool without degrading the image quality of the transferred image has been achieved.

Although the present invention has been described above with reference to one embodiment shown in the drawings, the present invention is not limited thereto.As shown in FIG. A structure in which a portion of the transfer layer 13) is missing may also be used. Furthermore, the ratio of the recording area (5) to the cleaning area (6) is not particularly limited, and may be combined as appropriate depending on the type of binder or inorganic filler constituting the heat-resistant protective layer, heat transfer conditions, etc. good. Further, a crosslinking agent, a lubricating agent, etc. may be added to the heat-resistant protective layer.

<Effects of the Invention> Since the present invention has the above-described configuration, it is possible to perform thermal transfer recording without causing sticking and without causing residue to adhere to a contact type thermal recording device even when continuous transfer is performed. becomes.

<Example> Three sheets of polyester film with a thickness of 6 μm were prepared, and each was heat-resistant by a gravure printing method using coating liquids for forming a recording area described in 1 to 6 below and coating liquid for forming a cleaning area described in 4 below. A protective layer was formed.

The heat-resistant protective layer was arranged such that a band-shaped recording area with a width of 20 mm and a cleaning area with a band-shaped width of a tooth width were positioned alternately in the running direction of the thermal head, and the surface thereof was uniform. The dry coating thickness of the heat-resistant protective layer on each film is 1μ
Met. Further, the temperature atmosphere during drying was 100C.

Coating liquid 1 Coating #E2 Coating liquid 3 Coating liquid 4 As described above, a heat-resistant protective layer was formed on the other side of the base material of each film from 1 to 1, using a thermal d-line transfer ink having the following composition,
A hot melt transfer layer was formed by a roll coater method under heating conditions of 100C to obtain a heat-sensitive transfer material. Thermal transfer materials having recording areas formed by coating liquids 1 to 3 were designated as thermal transfer materials 1 to 3, respectively.

Further, the layer thickness of the heat-fusible transfer layer of each transfer material 1 to 3 was 5 μm.

Heat-fusible transfer ink Next, using each of the heat-sensitive transfer materials 1 to 3 having a configuration of 9 or more, heat-sensitive transfer was performed on high-quality paper with a Bekk smoothness of 200" using a thin-film thermal head at a printing energy of 1 mJ/dot. The results are shown below.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of the thermal transfer material of the present invention, FIG. 2 is an explanatory diagram of the arrangement of the recording area and cleaning area in the heat-resistant protective layer, and FIG. 3 is a schematic diagram of the thermal transfer material of the present invention. It is an explanatory view of an example of. 11) Thermal transfer material (2) Base material (3)
...Heat-setting alternating layer (4)...Heat-resistant protective layer (5)
...Recording area (6)...Cleaning area

Claims (1)

[Claims] (1) A heat-fusible transfer layer is formed on one side of the base material, and at least a heat-resistant protective layer is formed on the other side, and the heat-resistant protective layer contains 2 to 10 inorganic fillers with an average particle size of 5 μm or less. A plurality of recording areas consisting of a composition added at least to a binder resin in a proportion of 50 to 150% by weight, and an inorganic filler having an average particle size of 20 to 40μ in a proportion of 50 to 150% by weight. The cleaning area is divided into a plurality of cleaning areas made of the added composition, and each area is arranged so that a contact-type heating recording tool used in thermal recording alternately comes into contact with the cleaning area. A heat-sensitive recording material.