JPH04270692A - Retransfer sheet - Google Patents

Abstract

PURPOSE:To obtain a retransfer sheet in which only a surface treating agent of a part lapped with an image formed on a retransfer sheet is transferred integrally with the image, and an excessive surface treating agent around the image is never transferred. CONSTITUTION:In a retransfer sheet 10 for producing a dry transfer material obtained by a thermal transfer method, a surface treating agent 12 is applied on one surface of a sheet substrate 11. The tensile strength of the surface treating agent 12 is in the range of 1 to 100kg/cm<2>. The surface treating agent 12 contains a silicone compound.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to retransfer of a dry transfer material for forming the above-mentioned characters, symbols, figures, etc. on the surface of a transferred object by pressure-sensitive transfer of images such as letters, symbols, figures, etc. Sea
In particular, the present invention relates to a retransfer sheet in a dry transfer material produced by printing and thermal transfer using a printing device such as a thermal transfer printer, typewriter, or word processor.

0002

2. Description of the Related Art A technique relating to a basic sheet capable of producing a dry transfer material by a thermal transfer method is disclosed in Japanese Patent Application Laid-Open No. 128987/1987. In this publication, a film made of polyethylene, polypropylene, fluororesin, etc., having a smooth surface with a contact angle of at least 95° to water, or a film made of silicone resin on the surface of a paper, metal foil, or plastic film base material is disclosed. A sheet with a covering layer formed thereon is used.

In order to form an ink image by thermal transfer onto a sheet having a contact angle of 95° or more (particularly 105° or more), it is necessary to reduce the surface tension of the ink to form an ink image on the sheet.
The temperature of the ink needs to be raised because the adhesive force between the sheet and the ink must be greater than the cohesive force between the ink and the adhesive force between the ink and the PET substrate. . For this purpose, it is necessary to apply high printing energy to the thermal head, which is extremely disadvantageous for thermal transfer devices equipped with a thermal head, such as the durability of the thermal head and the load on the power supply.

[0004] Furthermore, since an image formed by thermal transfer on a surface with poor wettability has weak adhesion to the general surface, it will be re-transferred even by applying a small amount of pressure. Therefore, unnecessary images are also transferred again, causing stains. Moreover, there is also the problem that the image may come off even if touched slightly during handling.

Furthermore, since the coefficient of static friction on the surface of the sheet is extremely small, there is a problem in that the sheet moves easily and is difficult to fix when a thermally transferred ink image is retransferred. Therefore, the retransferred image may be misaligned or distorted, making it impossible to obtain a complete image.

By the way, in order to prevent the problem of sheet movement during pressure-sensitive retransfer as described above, the adhesive layer is attached to the transfer pattern.
The technology of providing it on the sheet separately from the
It is disclosed in Japanese Patent No.-246298.

[0007] However, providing this adhesive layer partially at a predetermined position requires a manufacturing effort and requires the use of a dedicated device, resulting in a large cost. Furthermore, in order to cover the adhesive surface until use, release paper or the like must be attached, which further requires device innovation and cost. Furthermore, for sheets provided with a peelable coating layer made of silicone resin, it is necessary to apply two types of coating, the coating layer and the adhesive layer, and it does not matter which one is applied first. There is a good chance that it will affect the coating later.

[0008] That is, if silicone is applied first, it will cause sagging when applying the adhesive, and on the other hand, if the adhesive is applied first, it will be difficult to apply due to stickiness.
Even if a release paper is attached to prevent this stickiness, the thickness still affects the coating and makes coating difficult. Even if it is successfully manufactured, the adhesive layer is only present in a portion of the image, so the entire area around the image is not fixed, so the sheet will still move and it will not be possible to form a perfect image. It's difficult.

In any case, the surface treatment agents for retransfer sheets that have been reported so far are not agents that retransfer along with the ink image from the sheet substrate, but rather This improved the releasability from the ink image. Therefore, it was necessary to reduce the wettability of the surface and weaken the adhesion between the ink image and the retransfer sheet. For this reason, various problems have arisen, such as poor thermal transfer properties, the need for a large amount of transfer energy, and poor abrasion resistance.

In order to solve the above-mentioned problems, Japanese Patent Laid-Open No. 2-81684 and Japanese Patent Laid-Open No. 2-88294 disclose a technique of transferring the entire surface treatment agent.

[0011] The surface treatment agent described in the above application has a tensile strength of 1 Kg/cm2 or more and 100 Kg/cm2.
In the following, those having a melting point or softening point of 100°C or higher, or a melt viscosity at 100°C of 1000 poise or higher are used.

0012

[Problems to be Solved by the Invention] However, when performing a retransfer operation using a retransfer sheet provided with a transfer type surface treatment agent described in the above publication, the ink image formed on the retransfer sheet is There is a possibility that the surrounding surface treatment agent may also be transferred, so if the surface treatment agent is colorless and transparent, there is not much of a problem, but if a coloring agent is added to the surface treatment agent, pressure-sensitive retransfer may occur. The lines of the formed image become extremely thick, or in severe cases, the image collapses, making it difficult to visually recognize the existence of the image.

The present invention was made in order to solve the above-mentioned problems, and when retransferring, only the surface treatment agent in the portion that overlaps with the image formed on the retransfer sheet is integrated with the image. The purpose of the present invention is to provide a retransfer sheet that transfers the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface.

[0014]

[Means for Solving the Problems] In order to achieve this object, the retransfer sheet of the present invention has a tensile strength of 1 kg/cm2.
A silicone compound is added to the surface treatment agent layer having an amount of 100 kg/cm 2 or more.

[0015] The surface treatment agent layer desirably has a melting point or softening point of 100°C or more, or a melt viscosity at 100°C of 1000 poise or more.

[0016]

[Operation] The retransfer sheet according to the present invention having the above-described structure is obtained by forming a surface treatment agent layer 12 on one surface of a base material 11, for example, as shown in FIG.

It is desirable that the base material 11 has a thickness of 25 to 200 μm, preferably 50 to 150 μm. While it has sufficient mechanical strength for manufacturing and handling, it is designed so that pressure is easily applied during pressure-sensitive retransfer.
Further, it is desirable that the material has a certain degree of flexibility so that it is easy to manufacture a dry transfer material using thermal transfer.

However, if the elongation is too large, the base material will be elongated when pressure is applied during retransfer, resulting in distortion of the image, so a film having an elongation of 200% or less is preferable.

[0019] Furthermore, in order to accurately retransfer the image onto the transfer object during pressure-sensitive retransfer, it is preferable that the base material be transparent or semi-transparent. It is desirable that the sheet be semi-transparent so that it can be easily checked.

[0020] As a base material having the above characteristics,
Generally, plastic film, paper, metal foil, etc. are used. Examples of plastic films include ethylene,
Fluorine-based films made of fluororesins such as polypropylene, ethylene-tetrafluoroethylene copolymer and tetrafluoroethylene-hexafluoroethylene copolymer, polyethylene terephthalate, nylon, polyimide, polyvinyl chloride, polycarbonate , polysulfone, ethylene-vinyl acetate copolymer, acrylonitrile-
Examples include butadiene-styrene copolymer and ionomer.

Next, the surface treatment agent layer 12 formed on one surface of the base material 11 has a tensile strength of 1 Kg/cm2 or more and 100
It is desirable that it is below Kg/cm2.

[0022] This is necessary in order to retransfer the surface treatment agent together with the transfer image formed by thermal transfer from the sheet onto the object to be transferred. In other words, if the tensile strength is 100 Kg/cm2 or more, the cohesive force of the surface treatment agent is too large and forms a strong film, causing the problem that it will not transfer even if pressure is applied, and if the tensile strength is 1 Kg/cm2 or less, However, since the strength of the membrane is too weak, there is a problem that the sheet peels off just by bending, so a tensile strength of 1 Kg/cm2 or more and 100 Kg/cm2 or less is desirable.

[0023] Furthermore, the melting point and softening point of the above surface treatment agent are as follows:
It is desirable that the temperature is 100°C or higher, and even if melted, the temperature will be 10°C or higher.
It is desirable that the viscosity at 0°C is 1000 poise or more.

[0024] This is because it melts below 100°C,
If a surface treatment agent that is extremely soft is used, the surface treatment agent will also dissolve during image formation by thermal transfer, improving the adhesion between the sheet base material and the surface treatment agent, and reducing retransfer failure. This is because it becomes a cause.

By using a surface treatment agent having the above-mentioned tensile strength and melting point, an ink image formed by thermal transfer can be retransferred together with the surface treatment agent.
There is no need to consider the wettability of the surface treatment agent at all. Therefore, a good heat-sensitive transfer image can be obtained with low energy, and a retransfer sheet with good abrasion resistance and high adhesion between the ink image and the surface treatment agent can be obtained. Furthermore, since the coefficient of static friction on the surface can be increased, there is almost no movement of the sheet during retransfer, and a retransferred image can be easily and neatly formed.

Furthermore, until now, when transferring a large image using a thermal transfer device, in the case of a serial type with a small head,
It was necessary to form the image several times, and it had to be transferred overlappingly. Therefore, there is a problem in that the previously transferred image is scraped off by the head during the next transfer, and a complete image cannot be formed. Therefore, by dividing the image into rows and transferring them separately, the image was prevented from being scraped by the head, and when retransferring, the divided images were combined one after another to complete the retransferred image. If the sheet of the present invention is used, the adhesion force is increased, so that it becomes possible to thermally transfer large images in a connected state.

Another advantage of retransferring the entire surface treatment agent is that since the surface treatment agent is also retransferred together with the ink image, a complete retransferred image can be formed without any residual ink; In addition, the surface treatment agent retransferred together acts as a protective layer for the ink image, improving the scratch resistance of the retransferred image.

However, if the entire surface treatment agent is transferred, there is a possibility that the surface treatment agent around the ink image formed on the retransfer sheet may also be transferred. However, by adding a silicone compound to the surface treatment agent, it is possible to change the adhesion, adhesion, and adhesion of the surface treatment agent layer, and by adjusting the amount added, the surface treatment agent layer can be It also becomes possible to adjust adhesion, adhesion, adhesion, etc. This makes it possible to lower the surface of the surface treatment agent layer to the desired level of adhesion, adhesion and adhesion, and prevent transfer of excess surface treatment agent present around the image. be.

Examples of the above-mentioned surface treatment agents include polyethylene, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, celluloses, and ethylene-ethyl acrylate. Examples include resins such as copolymers, ethylene-acrylic acid copolymers, ionomers, ethylene-methacrylic acid copolymers, polyvinyl alcohol, and polyvinylpyrrolidone, and silicone compounds such as silicone resins, silicone oils, and silicone fine powders. It will be done. Then, one or more silicone compounds are added to one or more of these resins or a mixture of two or more of these resins.

In addition, in order to finely adjust the tensile strength of the surface treatment agent, increase the range of selection of materials used, and improve retransferability, polyethylene wax, montan wax, Fischer-Tropsch wax, synthetic wax,
Adding one or more waxes such as
It may be used as a complete replacement for resin. Furthermore, by adding dyes, pigments, etc., it is possible to obtain sufficient hiding power even if a color with weak hiding power is used.

[0031] When using this resin as a main component, if it is dissolved in a solvent or used as a hot melt, the tensile strength will become too large, so it should be used as a fine dispersion in emulsions, suspensions, etc. It's better to do so. In addition, fillers may be added to adjust tensile strength and adhesive strength.

By providing such a surface treatment agent on the sheet, thermal transferability, retransferability, abrasion resistance, adhesion of the image during handling, fixation of the sheet during retransfer, It is possible to obtain a retransfer sheet with good confirmation of retransfer and scratch resistance of the retransfer image.

[0033] The ink ribbon used to thermally transfer the desired transfer image onto the retransfer sheet can be used in printing devices such as ordinary thermal transfer printers, typewriters, word processors, etc. There is no problem even if the ink is coated with wax-based ink.
In particular, it is desirable to use an ink ribbon having a two-layer structure consisting of a transferability adjustment layer and an ink layer, which further improves heat-sensitive transferability and pressure-sensitive retransferability. This transferability adjustment layer is provided on the ink layer as a top coat layer, and has higher heat-sensitive adhesiveness, hardness, viscosity, and cohesive force than the ink layer, and thereby improves wettability. bad retransfer sheet
The heat-sensitive transfer properties onto the paper are significantly improved, and pressure-sensitive re-transfer is also possible. Moreover, by providing the ink layer with pressure-sensitive adhesive properties, the pressure-sensitive retransferability becomes even better.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to the drawings, but it goes without saying that the present invention is not limited in any way by such description.

In addition to the following examples and the above-mentioned specific description, the present invention may be modified in various ways based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that modifications, improvements, etc. may be made.

Example 1 A surface treatment agent having the following composition was coated on a polyethylene terephthalate film having a thickness of 50 μm, and then dried to give a contact angle with water of 39° and a coefficient of static friction of 0. A retransfer sheet having a size of about 42 and having a smooth surface was obtained. The tensile strength of this surface treatment agent is about 20 kg/cm2, and the melt viscosity at 150°C is about 2000 to 4000 poise.

Surface treatment agent composition

Weight part Polyethylene

70 [Mitsui Petrochemical Industries, Ltd.
Chemipearl M-200] titanium oxide

20 [TYPEQUE A-100 manufactured by Ishihara Sangyo Co., Ltd.] Silicone resin
10
[KM766 manufactured by Shin-Etsu Chemical Co., Ltd.] Hardening agent


0.03 [PL-6 manufactured by Shin-Etsu Chemical Co., Ltd.
AB] On the thus obtained retransfer sheet, a thermal transfer type word processor (P-
A dry transfer material having a desired transferred image was obtained by thermally transferring the white ink using a touch screen. In this case, energy can be reduced compared to the conventional method, and a good transferred image can be obtained. When we performed pressure-sensitive retransfer onto transfer objects such as paper and plastic using this obtained dry transfer material, we found that it had sufficient hiding power and removed excess surface treatment agent around the ink image. It was possible to obtain a good white retransferred image with no transferred portions. Furthermore, since the sheet moves less and can be retransferred while being fixed, it has the advantage that it is easy to obtain a good retransferred image.

Furthermore, since the surface treatment agent is also retransferred, it is easy to confirm whether the ink image has been retransferred.
Since the surface treatment agent covered the retransferred ink image, the scratch resistance of the retransferred image was also improved.

Example 2 A nylon film with a thickness of 100 μm was used, and a surface treatment agent having the following composition was coated thereon, and after drying, the contact angle with water was 76° and the coefficient of static friction was 0. A retransfer sheet with a smooth surface of about 77 was obtained. The tensile strength of this surface treatment agent is 15 kg/cm2, and the melt viscosity at 150°C is about 5000 poise.

Surface treatment agent composition

Weight part Ionomer

70 [Mitsui Petrochemical Industries, Ltd.
Chemipearl SA-100] Azo organic pigment

20 [CROMOPHTAL Yellow manufactured by Ciba Geigy Corporation
w 3G] Silicone oil

10 [K manufactured by Shin-Etsu Chemical Co., Ltd.
P316] Then, the retransfer sheet obtained in this way
A dry transfer material was produced in the same manner as in Example 1 using the same method as in Example 1, and a retransfer image was formed on the material to be transferred by pressure-sensitive retransfer. A clean and good yellow retransfer image with no spots could be obtained.

Comparative Examples 1 to 2 Using the transfer sheets of Examples 1 and 2 in which no silicone compound was added to the surface treatment agent (Comparative Examples 1 and 2), dry transfer materials were prepared in the same manner as in Examples. When a re-transfer image was formed on the transfer object by pressure-sensitive re-transfer, the excess surface treatment agent around the ink image was transferred, resulting in thick lines in the transferred print image and poor detail. It became difficult to confirm.

[0042]

[Effect of the invention] As is clear from the detailed description above,
According to the present invention, only the surface treatment agent in the portion that overlaps with the image formed on the retransfer sheet is transferred together with the image, and the excess surface treatment agent around it is not transferred. A transfer sheet can be provided.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view showing an example of a retransfer sheet according to the present invention.

[Explanation of symbols]

10 Retransfer sheet 11 Sheet base material 12 Surface treatment agent 13 Ink image

Claims (1)

[Claims] [Claim 1] Tensile strength is 1Kg/cm2 or more, 10
In a retransfer sheet for producing a dry transfer material produced by a thermal transfer method, a surface treatment agent layer of 0 kg/cm2 or less is formed on one side, and the surface treatment agent layer contains a silicone compound. A retransfer sheet characterized in that: