JPS6327288A - Ink sheet - Google Patents

Abstract

PURPOSE:To obtain an ink sheet capable of being effectively used in imparting aroma to printed matter, by providing a binder layer having microcapsules each encapsulating perfume and opened by pressure or heating dispersed therein. CONSTITUTION:The microcapsules 3 dispersed in the ink layer 2 or a base film 1 are prepared by the a coacervation of a gelatin-gum arabic system and, as perfume to be encapsulated, menthol and eugenol etc. being natural perfume, vaniline and methyl salicylate etc. being synthetic perfume and, further, composition obtained by appropriately preparing said perfumes can be used. The microcapsules 3 in the ink sheet are transferred to a material 4 to receive transfer along with the ink layer 2 at the time of printing and destructed by the printing pressure between the material 4 to receive transfer and a printing head 5 to impart aroma to the material 5 to receive transfer. When pressure is applied to the microcapsules, said microcapsules are destructed at parts where a film thickness is reduced and perfume is volatilized to generate aroma and, at parts where the film thickness is increased, a volatilization speed is suppressed and aroma can be generated over a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an ink sheet, and particularly to an ink sheet used for pressure transfer recording or heat transfer recording, which makes it possible to impart a fragrance to a recording object.

BACKGROUND OF THE INVENTION Written records are a common means of expressing the will of individuals or companies. In order to express the characteristics of an individual or company, improvements have been made to the character format, character color, paper type, etc.

Here, we will consider a method of adding fragrance, which is used in some cases to add further characteristics.

For simple recording devices such as printers, there is a method of adding fragrance to the ink used, but if the fragrance is simply dispersed in the ink, the fragrance will volatilize while the ink is stored, and the paper There is a problem in that it is difficult to maintain the fragrance for a long time after it is applied to the fragrance.

Purpose The present invention has been made in view of the above circumstances, and its purpose is to solve the above-mentioned problems in the conventional method of imparting scent to printed matter, and to provide a method that can be effectively used in the method of imparting scent to printed matter. . An object of the present invention is to provide an ink sheet for pressure transfer recording or heat transfer recording.

Structure 1.Object of the present invention is to provide an ink sheet having an ink layer containing a color developer and a binder on a support, in which microcapsules encapsulating a fragrance can be opened by pressure or heating, or microcapsules can be opened by heating. This is achieved by Inksy 1-, which is characterized by providing a binder layer in which microcapsules made of a porous material are dispersed.

Hereinafter, the configuration of the present invention will be explained in more detail based on examples.

FIG. 1 is a sectional view showing the structure of an ink sheet 1 for pressure printing, which is an embodiment of the present invention. In the figure, 1 is a base film, 2 is an ink layer, and 3 is a fragrance-containing microcapsule dispersed in the ink layer 2.

The microcapsules 3 are prepared, for example, by gelatin-gum arabic coacervation. Regarding this method of preparing microcapsules, for example, the description in "Microcapsules - Manufacturing method, properties, and applications" by Kondo and Koishi (Tool Publishing, 1977) can be referred to.

In the coacervation method, phase separation is caused by adding ethanol to a gelatin solution in which the fragrance to be encapsulated is dispersed, and concentrated gelatin microdroplets coat the fragrance.
This is a method that utilizes gelation.

Natural fragrances include menthol,
Various synthetic fragrances such as eugenol, gelanol, linalool, vanillin, methyl salicylate, cinnamic aldehyde, and appropriate mixtures of these can be used.

For perfumes with poor retention, the retention can be improved by adding a volatile retention agent such as oil or resin.

Control of the fragrance can be adjusted by adjusting the film thickness of the microcapsules, the dispersion ratio in two, the fragrance concentration, etc. Among these, the size of the microcapsules described in -1- is usually preferably 10 μm or less, but may be changed as appropriate depending on the recording method, the pressure between the head and the transferred object, etc. The same applies to the base film thickness and the ink layer thickness.

Figures 2 (A) and (B) show the process of opening two series of microcapsules.

The microcapsules 3 in the ink sheet 1 move onto the transfer target 4 together with the ink layer 2 during printing, and are "pressure-opened" by the printing pressure between the transfer target 4 and the print head 5 during printing, and the microcapsules 3 move onto the transfer target 4 during printing. It imparts aroma to the transfer material. Specifically, in an impact printer, the seal is opened by the pressure of a pin or hammer, and in a thermal printer, the seal is opened by pressure between the head and the transfer paper.

It is difficult for microcapsules to have a uniform film thickness of 4=- during preparation, and the film thickness varies. As mentioned above, when pressure is applied, the thin part of the film opens, and the perfume evaporates from there, producing a fragrance. In thicker areas, the film slows down the rate of volatilization, making it possible to generate fragrance over a long period of time.

As an application example, as shown in FIGS. 3 and 4, an ink sheet is coated with a base film 1. It is conceivable that the ink layer 2 is composed of an ink layer 2 in which capsules containing a fragrance are dispersed and a normal ink layer 6.

In the example shown in FIG. 4, the normal ink layer 6 is replaced with an ink layer 2 in which capsules containing the fragrance are dispersed.
are placed on both sides of the

The embodiments shown in FIGS. 3 and 4 have the effect of preventing deterioration in print quality due to exposure of the microcapsules on the surface of the ink layer.

FIG. 5 shows another example of application, in which a core substance that retains the fragrance is placed in the microcapsules described in item 1 to further extend the persistence of the fragrance. This microcapsule is designated by the symbol 3A.

FIG. 6(A) shows still another embodiment of the present invention, in which the film of the microcapsules described above is made of a polymer that becomes porous upon heating (see FIG. 6(B)). This shows that.

Polyamides and polyesters are examples of polymers that have the property of becoming porous when heated.

Examples include polyvinylidene chloride copolymer.

The microcapsules of this example were prepared before heating (non-porous).
is represented by symbol 3B, and after heating (porous) is represented by symbol 3C.

"1 Microcapsules 3B are prepared, for example, by interfacial polymerization of polyamide. Regarding this method of preparing microcapsules, reference may be made to the above-mentioned book by Kondo and Koishi.

The interfacial polymerization method described in Section 2 is a method in which a monomer that produces a polymer through a polymerization reaction is dissolved in each of mutually immiscible liquids and brought into contact with the solution.

In the case of polyamide 1, for example, piperazine is dissolved in water and terephthaloyl dichloride is dissolved in carbon tetrachloride and then brought into contact with each other.

FIGS. 7(A) and 7(B) show a method of imparting fragrance to a print sample using the ink sheet shown in FIG. 6. In the ink sheet described in item 1, the fragrance in the microcapsules (3B above) is covered with a polymer film in the binder before use, and the fragrance does not volatilize during storage.

During printing, the microcapsules become porous due to the heating of the thermal head 7, and at the same time, the wax that is the binder of the ink layer melts, leaving the microcapsules ("-3C) included in the transferred material 4. transcribed.

This microcapsule 3C is able to generate fragrance from its porous surface, and since the film has a porous structure, it can retain and sustain the fragrance for a long time.

Effects As described above, according to the present invention, in an in-arc sheet having an ink layer containing a color developer and a binder on a support, a fragrance is encapsulated and the seal is opened by pressure or heating. Since a binder layer in which microcapsules or microcapsules made of a material that becomes porous upon heating is dispersed is provided, ink sheet 1 for pressure transfer recording or heat transfer recording can be effectively used in a method of imparting fragrance to printed matter. This has the remarkable effect of realizing ~.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of an ink sheet for pressure printing which is an embodiment of the first invention, and FIG. 2 (A). (B) is a diagram showing the opening process of microcapsules, Figures 3 to 5 are diagrams showing other embodiments of the present invention, and Figure 6 (A)
, (B) is a configuration diagram of an ink sheet for heating printing showing an embodiment of the second invention, and FIGS. 7(A) and 7(B) are diagrams showing a method of imparting fragrance to a print sample. 1: Base film, 2: Ink layer, 3: Microcapsules containing fragrance, 4: Transfer target, 5: Print head, 6: Ordinary ink layer, 7: Thermal head. 18= Figure 1 Figure 2 Figure 3 Cow Figure 5 Figure 6 Figure 7

Claims (4)

[Claims] (1) An ink sheet having an ink layer containing a color developer and a binder on a support, characterized in that a binder layer in which microcapsules encapsulating a fragrance and which are opened by pressure or heat are dispersed is provided. ink sheet. (2) The ink sheet according to claim 1, wherein the binder layer containing the microcapsules is the ink layer. (3) In an ink sheet having an ink layer containing a color developer and a binder on a support, a binder layer in which microcapsules containing a fragrance and made of a material that becomes porous upon heating is dispersed is provided. Characteristic ink sheet. (4) The ink sheet according to claim 1, wherein the binder layer containing the microcapsules is the ink layer.