JPH02270583A - Thermal transfer ribbon - Google Patents

Abstract

PURPOSE:To keep aroma for a long period of time by forming a wax layer compounded with aromatic-containing microcapsules between a base material and a heat-meltable ink layer. CONSTITUTION:A thermal transfer ribbon is constituted of a base material 1, a wax layer 2 having aromatic-containing microcapsules 3 added thereto and a heat-meltable ink layer 4 and, if necessary, a protective layer 5 is formed. As the base material 1, a polyester stretched film and condenser paper are designated. The aromatic-containing microcapsules 3 are formed by using silica as a wall material and employing lemon aromatic or the like as content and, as the wall material, one having high destruction temp. is pref. The wax layer 2 is formed using an emulsion of carnauba wax or the like. In order to uniformize the thickness of the wax layer 2 or that of the heat-meltable ink layer 4, the mean particle size of the microcapsules it pref. set to 5mum or less and the compounding amount thereof is pref. 5 - 8pts. by wt. of the whole of wax. The heat-meltable ink layer 4 is formed by ink having an m.p. of 60 - 80 deg.C and compounded with a colorant, wax, a resin and additives. Since the heat applied to the microcapsules at the time of preparation is low and aromatic is not decomposed, aroma is kept for a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a thermal transfer ribbon used in a thermal transfer recording method in which characters and images are recorded by a transfer method using a thermal helad.

<Prior Art> A conventional scented thermal transfer ribbon is one in which microcapsules containing a fragrance are blended into a heat-melting ink layer, as shown in FIG. This ink is made by blending microcapsules into a fluidized vehicle such as wax, which is exposed to high temperatures during production.
Furthermore, when applying the ink to the base material of the transfer ribbon, it must be heated and melted, and in both cases it is exposed to high temperatures for a long time, so the capsule wall material is made of heat-resistant material that is not easily destroyed by heat. Furthermore, fragrances have been limited to high-temperature types that do not easily decompose due to heat.

Therefore, most of the fragrances normally used in printing cannot be used, and even if they are used, a large amount of the fragrance decomposes or evaporates before being made into the transfer ribbon, making it impossible to obtain recorded materials with fragrance. Ta.

<Problems to be Solved by the Invention> This invention solves the above-mentioned drawbacks of conventional scented thermal transfer ribbons, namely, the problem that a large amount of fragrance decomposes or evaporates during production, and makes it possible to maintain fragrance for a long period of time. This was done for the purpose of

<Means for Solving the Problems> In other words, the thermal transfer ribbon of the present invention has a wax layer formed between a base material and a heat-melting ink layer, and fragrance-containing microcapsules are blended into the wax layer. This is a characteristic feature.

The structure of the thermal transfer ribbon of the present invention is as shown in FIG.
Base material 1. Wax layer 2 containing fragranced microcapsules 3. It is composed of a hot-melt ink layer 4, and a protective layer 5 is formed on the back surface of the base material 1 as required.

As the base material 1, a heat-resistant film or paper commonly used for thermal transfer sheets is commonly used, and representative examples thereof include polyester stretched film and condenser paper. The fragrance-containing microcapsules 3 preferably have silica or the like as a wall material and lemon fragrance or the like as an inclusion, and preferably have a wall material with a high breaking temperature.The wax layer 2 is made of emulsion such as carnauba wax or candelilla wax. Use the converted one.

In order to make the thickness of the wax layer and the heat-melting ink layer uniform, the average particle size of the microcapsules used is 5μ.
It is preferable that the amount is 5 to 8 parts by weight based on the total weight of the wax.

The heat-melting ink layer 4 has a melting point of 60 to 80°C and contains a coloring material (f
It is formed using an ink containing 1 dye, wax 1 resin, and other additives. Examples of the wax include carnauba wax, candelilla wax, montan wax, and paraffin wax.

The protective layer 5 is provided for the purpose of preventing sticking between the thermal head and the film, and is made of a heat-resistant resin. Heat-resistant resins include polysulfone resin,
Examples include polyimide resin and nitrocellulose resin.

<Function> In the thermal transfer ribbon of the present invention, fragrance-containing microcapsules are blended into the processed wax and are formed on the base material as a layer separate from the heat-melting ink layer, so that the thermal transfer ribbon can be easily manufactured during the manufacture of the thermal transfer ribbon. The heat applied during the drying of the wax layer and the drying of the hot-melt ink are both for short periods of time. In other words, when blending microcapsules into wax, there is no need to heat it because the wax is emulsified, and since it is applied at room temperature, there is no need to constantly apply wax as with conventional products. There is no need to heat, and the drying process after application only forms the wax into a film, so heating is short and there is little heat adhesion, and the amount of heat applied when drying the hot-melt ink applied on top of it is reduced by heating. Not much because it's a short time.

Therefore, the amount of heat added to the microcapsules is small, so destruction of the capsules and decomposition of the fragrance hardly occur, and various microcapsules can be used.

Examples Examples of the present invention will be shown below.

Table 1 was first applied to a polyester stretched film with a thickness of 3.5 μm.
Emulsified wax of composition 0.5g/rr each
f coating and drying at 100° C. for 2 to 3 seconds to produce a thermal transfer ribbon.

The following evaluations were performed using the above thermal transfer ribbon.

First, among the thermal transfer ribbons produced as described above, three types were prepared: one immediately after coating, one stored at room temperature for 3 months, and one stored at room temperature for 6 months. After printing with a thermal printer, the We conducted an olfactory evaluation of the scent of objects. As a thermal transfer ribbon for comparison, a ribbon having the configuration shown in FIG. 2, that is, a ribbon in which perfumed microcapsules were blended with heat-melting ink, was used.

The evaluation results are shown in Table 3.

Table 1 Wax Composition Table 2 Ink Composition Table 3 Evaluation Results (Effects of the Invention) As can be seen from the evaluation results in Table 3, the thermal transfer ribbon of the present invention has a higher thermal transfer ribbon than the conventional one. Since the fragrance is low and hardly breaks down during manufacturing, the fragrance lasts for a long time.

Note that the duration is usually about one year after printing.

FIG. 2 is a sectional view illustrating the structure of a conventional scented thermal transfer ribbon.

1...Base material 2...Wax layer 3...Fragranced microcapsules 4...Thermofusible ink layer 5...Protective layer Patent application Hitotoppan Printing Co., Ltd. Representative Kazuo Suzuki

Claims (2)

[Claims] (1) In a thermal transfer ribbon having a heat-fusible ink layer on one side of the base material, between the base material and the heat-fusible ink layer,
A thermal transfer ribbon characterized by forming a wax layer containing microcapsules containing fragrance. (2) The average particle size of the microcapsules is 5 μm or less, and the microcapsules are blended in the wax so that the proportion of the microcapsules to the total weight is 5 to 8 parts by weight. 1. The thermal transfer ribbon according to 1.