JPH03178492A - Re-transfer sheet for preparing dry transfer material - Google Patents

Abstract

PURPOSE:To make a sheet easy to fix and hard to move at the time of re-transfer by forming a transfer type release layer to one surface of a sheet and forming a surface treatment agent layer having a predetermined range of tensile strength and using wax as a component on the transfer type release layer. CONSTITUTION:A transfer type release layer 13 is provided to the single surface of a sheet base material 11 and a surface treatment agent layer 12 having tensile strength of 1 - 100 kg/cm<2> and containing wax as a component is provided thereon. The main component of the transfer type release layer 13 is set to wax and the cohesive force thereof is made lower than that of the surface treatment agent layer 12 to impart an m.p. or softening point of 100 deg.C or higher to a surface treatment agent or the surface treatment agent whose melt viscosity at 100 deg.C is set to 1000 poise or more is used. For example, the transfer type release layer 12 is formed to one surface of the base material 11 and the surface treatment agent layer 13 is formed thereon.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a dry transfer method for forming characters, symbols, figures, etc. on the surface of an object to be transferred by pressure-sensitive transfer of images such as letters, symbols, figures, etc. The present invention relates to retransfer sheets for publications, and particularly relates to 14 transfer sheets in dry transfer materials produced by printing and thermal transfer using printing devices such as thermal transfer printers, typewriters, and word processors.

[Prior Art] A report has been made in Japanese Patent Application No. 61275537 regarding a basic sheet capable of producing a dry transfer material by a thermal transfer method.

In this report, a film made of polyethylene, polypropylene, fluororesin, etc. with a smooth surface with a contact angle of at least 95° to water, or a film made of silicone resin on the surface of paper, metal foil, or plastic film material is proposed. A layered sheet is used.

In order to form an image by thermal transfer onto a sheet having a contact angle of 95° or more (particularly 105° or more),
In addition to reducing the surface tension of the ink and making it wet on the sheet, the adhesive force between the sheet and the ink can be improved by the cohesive force between the ink and the ink and PET21! Since the adhesive force must be greater than the adhesive force with the i-material, the temperature of the ink must be increased. Therefore, in order to achieve this, high printing energy is required, which is extremely disadvantageous for thermal transfer devices, such as the durability of the head and the load on the power supply.

In addition, images formed on surfaces with poor wettability by thermal transfer are
Because the adhesion to the plate surface is weak, even a small amount of pressure will cause re-transfer.

Therefore, unnecessary images are also transferred again, causing stains. Moreover, there is also the problem that the image may come off with just a slight touch 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 movement of the sheet during pressure-sensitive retransfer as shown here, it was reported in Japanese Patent Application No. 80127/1987 that an adhesive layer was provided on the sheet separately from the transferred pattern. There is.

[Problem to be solved by the invention H However, providing this adhesive layer partially at predetermined positions requires ingenuity in manufacturing and requires the use of special equipment, resulting in a large cost. It will cost. Furthermore, in order to cover the adhesive surface until use, a 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 coat two layers: the coating layer and the adhesive layer, and whichever is coated first must be coated later. There is a good chance that it will have an impact during construction. That is,
If the silicone is applied first, the adhesive coating ■9 will repel. On the other hand, if the adhesive is applied first, it will become sticky and difficult to apply, so use release paper to prevent this stickiness. Even if it is applied, it will still be difficult to coat due to its thickness. Even if it is successfully manufactured, the adhesive layer is only present on a portion of the image, so the entire area around the image is not fixed, so the sheet will still move.
It is difficult to form a complete picture.

In any case, the surface treatment agent for the retransfer sheet that has been reported so far is not one that transfers the ink image together with the sheet base, but rather improves the releasability between the retransfer sheet and the ink image. It was something. Therefore, it was necessary to reduce the risk of the surface and weaken the adhesion between the ink image and the retransfer sheet. As a result, various problems have arisen, such as poor thermal transfer properties, the need for a large amount of transfer energy, and poor abrasion resistance.

The present invention has been made against the background of such vehicle conditions, and its first purpose is to provide a retransfer sheet that facilitates the fixation of the sheet on the four sides of the retransfer and is difficult to move. It's about doing.

A second object of the present invention is to provide a retransfer sheet in which the ink image on the retransfer sheet does not peel off due to slight pressure or abrasion.

Furthermore, a third object of the present invention is to provide a retransfer sheet that can obtain good transfer quality with low transfer energy.

Furthermore, a fourth object of the present invention is to provide a retransfer sheet on which a transferred ink image can be completely retransferred without any residual ink.

A fifth object of the present invention is to provide a retransfer sheet that makes it easy to confirm whether an ink image has been retransferred.

Furthermore, the sixth object of the present invention is to improve the retransferred ink image by
It is an object of the present invention to provide a retransfer sheet having good scratch resistance.

Furthermore, a seventh object of the present invention is to provide a retransfer sheet in which the tensile strength of the surface treatment agent can be easily adjusted and the retransferability can be improved.

A third object of the present invention is to provide a retransfer sheet that has a wide range of surface treatment agents to choose from, is free from problems when applying the surface treatment agent, and has excellent pressure-sensitive retransferability. There is a particular thing.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a transfer mold release layer on one side of a sheet base material, and a 1kg/
It is characterized in that it has a tensile strength of CD or more and 100 kg/cm2 or less, and is provided with a surface treatment agent layer containing wax as a component.

Further, the main component of the transfer mold release layer is wax, and its cohesive force is made smaller than that of the surface treatment agent layer, and the surface treatment agent is given a melting point or a softening point of 100° C. or more. By using a surface treatment agent having a melt viscosity of 1000 voices or more at 100° C., the object can be advantageously achieved.

[Function] For example, as shown in FIG. 1, the retransfer sheet according to the present invention has a transfer mold release layer 12 on one surface of the base material 11.
, and a surface treatment agent layer 13 is formed thereon.

The base material 11 has a thickness of 25 to 200 μm, preferably 5
It is desirable to have a thickness of 0 to 150 μm. And while it has sufficient mechanical strength for manufacturing and handling,
It is desirable to have a certain degree of flexibility so that pressure can be easily applied during pressure-sensitive retransfer, and so that it is easy to leave a dry transfer material in 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. Therefore, a film having an elongation of 200% or less is preferable.

In addition, the base material is preferably transparent or semi-transparent so that the image can be accurately retransferred onto the transfer object during pressure-sensitive retransfer, and in particular, it can be checked whether the thermally transferred image has been completely retransferred. A translucent sheet that is easy to clean is desirable.

As a base material having such characteristics, plastic film, paper, metal foil, etc. are generally used.

Examples of plastic films include fluorine-based films made of fluororesins such as ethylene, polypropylene, ethylene-tetrafluoroethylene copolymers and tetrafluoroethylene-hexafluoroethylene copolymers, polyethylene terephthalate, nylon, polyimide, and polyvinyl chloride. , polycarbonate, polysulfono. Examples include ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and ionomer.

Next, the transfer mold release layer 12 formed on one surface of the base material 11 is made of clay-based waxes such as candelilla wax, carnauba wax, and rice wax; animal-based waxes such as minwax and lanolin; montan wax, ceresin wax, etc. Mineral waxes such as: petroleum waxes such as paraffin wax and microcrystalline wax; synthetic waxes such as Fischer-Tropsch wax and polyethylene wax,
It is made of wax consisting of one or more types of wax.

In addition, the cohesive force, adhesive force, and film strength of the transfer mold release layer 12:
For J3 adjustment, resins such as polyethylene, ethylene-vinyl acetate copolymers, celluloses, and ionomer polyvinyl alcohol may be added.

The transfer mold release layer 12 thus obtained has a surface treatment agent 13
, the cohesive force is smaller than that of the ink image 14, and therefore, as shown in Fig. 2, when pressure-sensitive retransfer is performed, the transfer mold release layer 1
Cohesive failure occurs in 2, and pressure-sensitive retransfer becomes easy.

Until now, the adhesive force to the transfer sheet base material was large;
Surface treatment agents with poor mold releasability could not be used, but by providing a transfer mold release layer, there is no longer a need to consider mold releasability, so the selection range of materials used for surface treatment agents has increased. Not only is the area expanded, but the pressure-sensitive retransferability is also very good.

The transfer mold release layer 12 to be formed is preferably transparent so that the color of the transfer (elephant) does not change.

The surface treatment agent layer 13 formed on the transfer mold release layer 12 has a tensile strength of 1 kg/cd or more and 100 kg/cd.
It is desirable that it be below CD.

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 transfer target.

That is, if the tensile strength is 100 kg/cd 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. However, since the strength of the membrane is too weak, there is a problem that it will peel off just by bending the sheet.
A tensile strength of 0 kg/cm2 or less is desirable.

Further, it is desirable that the melting point and softening point of the above-mentioned surface treatment agent be 100°C or higher, and even when melted, the viscosity at 100°C is preferably 1000 poise or higher.

This is because if a surface treatment agent that melts or becomes extremely soft at temperatures below 100° C. is used, the surface treatment agent will also melt during image formation by thermal transfer, resulting in poor retransfer.

By using a surface treatment agent with the above tensile strength and melting point, etc., the ink image formed by thermal transfer can be re-transferred to the surface treatment agent, so the composition properties of the surface treatment agent are completely taken into consideration. There will be no need to do so. Therefore, a good heat-sensitive transfer image can be produced with low energy, and a retransfer sheet with good scratch resistance and strong adhesion between the ink image and the surface treatment agent can be obtained. Also,
Since the coefficient of static friction on the surface side can be increased, there is almost no movement of the sheet during retransfer, and it is possible to retransfer (form an image) with a clean interval i+t.

Furthermore, until now, when a large image was transferred 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 the images had to be transferred in layers. 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 is prevented from being scraped by the head, and when retransferring, the divided images are combined one after another to complete the retransferred image. If the sheet of the present invention is used, the adhesion force will be increased, so that one large image can be thermally transferred in a connected state.

In addition, the advantage of re-transferring the surface treatment agent is that since the surface treatment agent is also re-transferred to the ink image, a complete re-transfer image can be formed without any residual ink, and whether the re-transfer has been performed or not This makes it easier to confirm, and −
The surface treatment agent retransferred to the ink layer serves as a protective layer for the ink image, thereby improving the scratch resistance of the retransferred image.

Furthermore, by adding wax to the surface treatment agent component and adjusting its amount, it is possible to finely adjust the tensile strength, which greatly expands the range of materials that can be used as the surface treatment agent component. Therefore, the retransferability is also significantly improved.

Examples of the above-mentioned surface treatment agents include polyethylene, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, celluloses, ethylene-ethyl acrylate copolymer, and ethylene-acrylic acid copolymer. Examples include resins such as polymers, ionomers, ethylene-methacrylic acid copolymers, polyvinyl alcohol, polyvinylpyrrolidone, and silicones, and waxes such as polyethylene waxes, montan waxes, Fischer-Tropsch waxes, and rigid waxes.

Then, one type or a mixture of two or more of these can be used.

If this resin is used as a main component, the tensile strength will be too large if it is used in a solvent with a melt angle of q or in a hot melt, so it should be used as a fine dispersion in emulsions, suspensions, etc. It's better. Further, a filler may be added to improve tensile strength and adhesive strength. The formed surface treatment agent layer is preferably transparent so that the colors of the retransferred image do not overlap.

By providing such a surface treatment agent on the sheet, thermal transferability, retransferability, scratch resistance, adhesion of the image during handling, rotation of the sheet during retransfer, and whether or not retransfer has been performed can be improved. It is possible to obtain a retransfer sheet that has good checkability, good scratch resistance of the retransferred image, and has a desired tensile strength.

The ink ribbon used to thermally transfer the desired transfer image onto the retransfer sheet is a wax-based ink that is used in ordinary thermal transfer printers, typewriters, word processors, and other printing devices. There is no problem even if the product is coated with 2!
It is desirable to use a two-layer ink ribbon consisting of an alignment layer and an ink layer. This transferability adjustment layer is necessarily provided on top of the ink layer as a top coat, and has higher heat-sensitive adhesiveness, hardness, viscosity, and cohesive force than the ink layer. Thermal transfer properties onto the retransfer sheet are significantly improved, and
This makes it possible to perform pressure-sensitive retransfer as a single unit. Moreover, by providing the ink layer with pressure-sensitive adhesive properties, the -layer and pressure-sensitive retransferability become better.

[Examples] Some examples of the present invention will be shown below to clarify the present invention more specifically, but the present invention is not limited in any way by such descriptions. That goes without saying.

In addition to the following examples and the above-mentioned specific description, the present invention may include various changes and modifications based on the knowledge of those skilled in the art, as long as they do not depart from the spirit of the present invention. It should be understood that improvements and modifications may be made.

Example 1 A transfer mold release agent having the following composition was coated on a polyethylene terephthalate film having a thickness of 50 μm, and heated at 80°C.
A surface treatment agent was applied thereon and dried at 80°C to obtain a retransfer sheet with a smooth surface and no problems in coating. The tensile strength of this surface treatment agent is approximately 20 kg/cm
2 and the melting point is about 120°C.

Release agent composition Parts by weight Low molecular weight polyethylene 20 [Sunwax E-3001 manufactured by Sanyo Kasei Corporation ■ Furkylamide activator 4 [Profane 2012E manufactured by Sanyo Chemical Industries ■] Water 96
Surface treatment agent composition Parts by weight Polyethylene wax 90 [Chemipearl w-too coethylene-vinyl acetate copolymer manufactured by Mikata Petrochemical Industries ■ 10 [Chemopar V-3001 manufactured by Mikata Petrochemical Industries ■] Retransfer sheet thus obtained Above, a thermal transfer word processor (P-10UC manufactured by Brother Industries)
+) to thermally transfer the ink to obtain a dry transfer material that can form a desired transferred image. At that time, it was possible to lower the energy range than before, and moreover, it was possible to obtain a good transferred image. When pressure-sensitive retransfer was performed on a transfer target such as paper or plastic using the obtained dry transfer material, the pressure-sensitive retransferability was good and a clear retransferred image was obtained. did it. 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. In addition, since the surface treatment agent is also retransferred all at once, it is easy to confirm whether the ink image has been retransferred or not, and since the surface treatment agent covers the retransferred ink,
The scratch resistance of the retransferred image also improved.

Example 2 Using a nylon film with a thickness of 100 μm, a transfer mold release agent having the following composition was applied thereon, and after drying at 80°C, a surface treatment agent was applied, followed by drying at 80°C. A retransfer sheet with a smooth surface and no problems in coating was obtained. The tensile strength of this surface treatment agent is 10 kg/cm2, and the melting point is 10 kg/cm2.
It is 9℃.

Transfer type 1liI type agent composition: Part by weight Polyethylene wax 100 [Mitsui Hiwax II OPI manufactured by Mikata Petrochemical Industries ■ Toluene 90 Surface treatment agent composition: Part by weight Ionomer
100 [Chemivar V-1oo manufactured by Mitsui Petrochemical Industries, Ltd.] Then, using the retransfer sheet obtained in this way, a dry transfer material was produced in the same manner as in Example 1, and a retransfer image was transferred onto the object to be transferred. When the image was formed by pressure-sensitive retransfer, a clear retransfer image could be obtained.

Comparative Example 1 A printing test and pressure-sensitive retransfer test were conducted in the same manner as in Example 1 using a retransfer sheet in which the surface treatment agent of Example 1 was used but no transfer mold release layer was formed. Example 1
The pressure-sensitive retransferability was poor compared to that of the conventional method, specifically, the mold releasability of the surface treatment agent layer was poor, and pressure-sensitive retransferring required a little force and perseverance.

[Effects of the Invention] As is clear from the above description, when a dry transfer material is produced using a printing device such as a thermal transfer printer, typewriter, word processor, etc., on the retransfer sheet to be printed, According to the present invention, a transfer mold release layer is provided, and on the transfer mold release layer, 1 kg/cJ or more, 1
It has a tensile strength of 00 kg/cd or less, a melting point or softening point of 100"C or more, or a melt viscosity of 10
By providing a surface treatment agent that has 00 voids or more and contains wax in its components, it is possible to produce a retransfer sheet without considering risks, making it possible to form a good transferred image with low energy. . Therefore, the adhesion force is increased, so the scratch resistance is good, and the coefficient of static friction can also be increased, so it is possible to re-transfer! 1. It also makes it easier to fix the seat. In addition, since the surface treatment agent is also retransferred into a navy blue color, it is easy to confirm whether retransfer has been performed, and the retransfer quality is also extremely good. Furthermore, by providing a transfer mold release layer, there is no need to consider the mold release properties of the surface treatment agent, and as a result, the range of choices for the composition of the surface treatment agent is expanded, and the pressure-sensitive retransferability is further improved. It is possible to do so.

Furthermore, since the retransferred surface treatment agent covers the ink image and forms a protective layer, the scratch resistance of the retransferred image is also significantly improved.
By adjusting the amount of wax added to the surface treatment agent, a surface treatment agent with the desired tensile strength °a can be obtained, which widens the range of material selection for the surface treatment agent and improves retransferability. It is.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view showing an example of a retransfer sheet according to the present invention, and FIG. 2 is a view showing a state of pressure-sensitive retransfer according to the present invention. In the figure, 10 is a retransfer sheet, 11 is a sheet base material, 12 is a release layer, 13 is a surface treatment agent, and 14 is an ink image.

Claims (1)

[Claims] 1. In a retransfer sheet for producing a dry transfer material produced by a thermal transfer method, a transfer mold release layer is formed on one surface of the sheet, and the transfer mold release layer is formed on one surface of the sheet. On top of the layer
Tensile strength is 1kg/cm^2 or more, 100kg/cm^2
A retransfer sheet having the following properties and comprising a surface treatment agent layer containing wax as a component. 2. The retransfer sheet according to claim 1, wherein the main component of the transfer mold release layer is wax, and the cohesive force is smaller than that of the surface treatment agent layer. 3. The retransfer sheet according to claim 1, wherein the surface treatment agent has a melting point or softening point of 100°C or higher, or a melt viscosity at 100°C of 1000 poise or higher. 4. The retransfer sheet according to claim 1, wherein the surface treatment agent is formed using a finely dispersed material such as an emulsion.