JPH05139064A - Retransfer sheet - Google Patents

Abstract

PURPOSE:To make fixing of a sheet easy when retransfer is done and to obtain a good retransferring quality with a low transfer energy by forming a surface treating agent layer on one face of a base material of a retransfer sheet. CONSTITUTION:In a retransfer sheet 10 for preparing a dry-type transfer agent prepd. by means of a thermal transfer system, a surface treating agent layer 12 is formed on one face of the sheet 10. By providing the surface treating agent on the sheet like this, a retransfer sheet with good heat-sensitive transfer properties, retransfer properties, scratch resistance, adhesiveness of an image during handling and fixing of the sheet when retransfer is done can be obtd. and wettability can be freely adjusted. Thermal transfer energy can be decreased thereby and a beautiful printed image can be obtd. and in addition, optimum qualities on both thermal transfer and retransfer can be obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention transfers pressure sensitive images of characters, symbols, figures, etc.
Retransfer sheet of dry transfer material for forming symbols, figures, etc., especially retransfer sheet of dry transfer material produced by printing and heat transfer by printing device such as thermal transfer printer, typewriter, word processor It is about.

[0002]

2. Description of the Related Art Heretofore, a report on a basic sheet capable of producing a dry transfer material by a thermal transfer method has been disclosed in JP-A-63-128987. In this report, a film of polyethylene, polypropylene, fluororesin or the like having a smooth surface property with a contact angle with water of at least 95 °, or a coating layer made of a silicone resin on the surface of a paper, metal foil or plastic film substrate. Is used.

[0003]

In order to form an image on such a sheet having a contact angle of 95 ° or more (particularly 105 ° or more) by thermal transfer, the surface tension of the ink should be reduced to form a sheet. Since it is necessary to make the adhesive force between the sheet and the ink larger than the cohesive force between the ink and the adhesive force between the ink and the polyethylene terephthalate (PET) base material, it is necessary to raise the temperature of the ink. .. Therefore, in order to achieve this, high printing energy is required, which is extremely disadvantageous to the thermal transfer device such as durability of the head and load on the power source.

An image formed on a surface having poor wettability by thermal transfer is re-transferred by applying a little pressure because the adhesive force with the surface is weak. Therefore, even an unnecessary image is retransferred, which causes stain. Moreover, there is a problem in that the image can be taken out by just touching it a little during handling.

Furthermore, since the coefficient of static friction of the surface of the sheet is extremely small, there is a problem that the sheet is apt to move and difficult to fix when retransferring the ink image transferred by heat. Therefore, the retransfer image is displaced or distorted, and a perfect image cannot be obtained.

By the way, in order to prevent the movement of the sheet, which is a problem at the time of pressure-sensitive retransfer, as described above, JP-A-63-24 is used.
In 6298, it is reported that the pressure-sensitive adhesive layer is provided on the sheet separately from the transfer pattern.

However, providing this pressure-sensitive adhesive layer partially at a predetermined position requires a great deal of manufacturing work and requires a dedicated device, which is very costly. Further, in order to cover the pressure-sensitive adhesive surface until the time of use, release paper or the like must be attached, and further devising of the device and cost are required. In addition, it is necessary to coat two types of coating layer and adhesive layer on a sheet provided with a peelable coating layer made of a silicone resin. There is a good chance that it will affect you. That is, if silicone is applied first, cissing will occur when the adhesive is applied, while
If the adhesive is applied first, it becomes difficult to apply it due to stickiness, and even if a release paper is attached to prevent this stickiness, the thickness of the release paper also affects the application. Even if it can be successfully manufactured, the adhesive layer is present only in a part, so the entire periphery of the image is not fixed, so the sheet still moves and it is difficult to form a complete image. is there.

Therefore, the present invention has been made in view of such circumstances, and a first object thereof is to provide a retransfer sheet which makes it easy to fix the sheet at the time of retransfer and does not move easily. To do.

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.

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

Still further, a fourth object of the present invention is to provide a retransfer capable of obtaining good retransfer quality even though the adhesive force between the ink image and the retransfer sheet is made larger than that of the conventional one. To provide a seat.

A fifth object of the present invention is to add a material having a good wettability (a contact angle to water of 8 to the composition of the surface treatment agent).
It is to provide a retransfer sheet that can obtain good retransfer quality even if 0 ° or less) is used.

Further, a sixth object of the present invention is to provide a surface treatment agent whose wettability can be adjusted so that good retransfer quality can be obtained even if the applied energy at the time of thermal transfer is changed. To provide a retransfer sheet.

[0014]

In order to achieve such an object, the present invention can achieve the object advantageously by forming a surface treatment agent on one surface of the retransfer sheet. is there.

[0015]

The retransfer sheet 10 according to the present invention is, for example,
As shown in the drawing, the surface treatment agent layer 12 is formed on one surface of the base material 11.

The base material 11 has a thickness of 25 to 200 μm, preferably 50 to 150 μm. And while having sufficient mechanical strength in manufacturing and handling, it is easy to apply pressure during pressure-sensitive retransfer,
Further, it is preferable to have some flexibility so that a dry transfer material can be easily manufactured by thermal transfer.

However, if the elongation is too large, the base material 11 will be elongated by applying pressure during retransfer,
Since the ink image 13 is distorted, a film having an elongation of 200% or less is preferable.

Further, the ink image 13 can be accurately transferred at the time of pressure-sensitive retransfer.
The base material 11 is preferably transparent or semitransparent so that it can be retransferred onto the transferred material, and in particular, it is a semitransparent sheet that makes it easy to confirm whether or not the thermal transfer image is completely retransferred. Is desirable.

The substrate 11 having such characteristics
Generally, a plastic film, paper, metal foil or the like is used as the material. Examples of plastic films include
Fluorine-based films made of fluororesins such as ethylene, polypropylene, ethylene-tetrafluoroethylene copolymer and tetrafluoroethylene-hexafluoroethylene copolymer, polyethylene terephthalate, nylon,
Examples thereof include polyimide, polyvinyl chloride, polycarbonate, polysulfone, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and ionomer.

Next, the surface treatment agent layer 12 formed on one surface of the base material 11 has a coefficient of static friction of 0.25 or more, preferably 0.3 or more.

This is necessary in order to form a complete retransfer image by fixing the ink image 13 so that the sheet does not move and become misaligned when the ink image 13 is retransferred from the sheet onto the transfer target. Become.

Further, by setting the contact angle with water to 80 to 120 °, preferably 80 to 110 °, the adhesion between the ink image and the retransfer sheet can be increased, so that a slight pressing pressure is applied. It will not be necessary to retransfer even unnecessary parts. Further, since it is difficult to peel off even if it is rubbed, it becomes easy to handle.

Further, in the past, when a large image was transferred by a thermal transfer device, it was necessary to form the image in multiple times when the head was a small serial, and it was necessary to transfer the images in layers. It was Therefore, the head scratches off the previously transferred image at the time of the next transfer, and there is a problem that a perfect image cannot be formed. Therefore, by dividing the image line by line and transferring it separately, the scratching of the image by the head was prevented, and when re-transferring, the re-transferred image was completed by combining the divided images one after another. When the sheet of the invention is used, the adhesive force is increased, so that thermal transfer can be performed in a state where large images are connected. Then, since the wettability is improved and the adhesive force is increased, it is possible to form a heat-sensitive transfer image with low heat transfer energy, and it is possible to obtain a good quality thereof.

Furthermore, it is desirable that the surface treating agent has an elongation of 100% or more. As a result, the surface treatment agent is unilaterally expanded by applying pressure during retransfer, so that the adhesion between the surface treatment agent and the image is weakened. Therefore, even if the surface treatment agent has good wettability and large adhesion, the retransfer property becomes good.

Examples of the above-mentioned materials used as the surface treatment agent include polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ionomer, ethylene-methacrylic acid copolymer. , Silicones, etc., containing one or a mixture of two or more as a main component.

However, here, in order to impart elongation,
When a material having a good wettability (contact angle with water of 80 ° or less) is used for the sake of manufacturing advantages, the surface treatment agent has a wettability of 80 ° or less, resulting in poor retransferability. Further, when the applied energy at the time of thermal transfer for forming an image on the retransfer sheet is increased, the adhesive force between the ink image 13 and the surface treatment agent becomes too strong, and the retransfer property also deteriorates.

Therefore, by adding silicone to the composition of the surface treatment agent, a contact angle of 80 to 1 with water is obtained.
A surface treatment agent having wettability corresponding to applied energy can be easily adjusted by achieving 20 ° and adjusting the addition amount.

The silicone includes oil, rubber,
Any shape may be used as long as it is an organic silicon compound such as resin. However, the contact angle with water must be 80 ° or more. Further, these may be used alone or in combination of two or more.

The above silicone is 0.01 to 50 parts by weight.
It is blended in a proportion of 100 parts by weight, and for silicone having an elongation of 100% or more, it is blended in a proportion of 0.01 parts by weight to 100 parts by weight.

By providing such a surface treatment agent on the above-mentioned sheet, good re-transfer such as heat-sensitive transfer property, re-transfer property, scratch resistance, image adhesion during handling, fixing of the sheet during re-transfer, etc. can be obtained. A transfer sheet can be obtained. In addition, the wettability can be adjusted arbitrarily.

The ink ribbon used for heat-sensitively transferring a desired transfer image onto the re-transfer sheet is a wax which is used in a printing device such as an ordinary heat-sensitive transfer type printer, typewriter or word processor. It does not matter even if the main ink is applied,
In particular, it is desirable to use an ink ribbon having a two-layer structure composed of a transferability adjusting layer and an ink layer, which have further improved heat-sensitive transferability and pressure-sensitive retransferability. This transferability adjusting layer is provided as a top coat layer on the ink layer and has a higher heat-sensitive adhesiveness, hardness, viscosity, and cohesive force than the ink layer, so that the wettability is poor. The heat-sensitive transfer property onto the retransfer sheet is remarkably improved, and the pressure-sensitive retransfer can be integrally performed. Moreover, by giving the ink layer pressure-sensitive adhesiveness,
The pressure-sensitive retransfer property is further improved.

[0032]

EXAMPLES Some examples of the present invention will be shown below to clarify the present invention in more detail, but the present invention is not limited by such description. It goes without saying that.

In addition to the following embodiments, the present invention is not limited to the above specific description, and various modifications can be made based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It is to be understood that modifications, improvements, etc. may be added.

Example 1 A surface-treating agent having the following composition was applied onto a polyethylene terephthalate film having a thickness of 50 μm, the contact angle with a groove was 103 to 104 °, and the coefficient of static friction was about 0.37. A retransfer sheet having a smooth surface was obtained. The elongation of this surface treatment agent is 650%.

Surface treatment agent composition parts by weight ethylene-vinyl acetate copolymer 10 [EVAFLEX640 manufactured by Mitsui DuPont Polychemical Co., Ltd.] Silicone 0.1 [KP-358 manufactured by Shin-Etsu Chemical Co., Ltd.] Toluene 90 On the retransfer sheet 10 thus obtained, a thermal transfer type word processor (NP-manufactured by Brother Industries, Ltd.)
5100) to thermally transfer the ink to obtain a dry transfer material having a desired transfer image. At that time, the energy can be reduced as compared with the conventional case, and a good transferred image can be obtained. Then, the obtained dry transfer material was used to perform pressure-sensitive retransfer to an object to be transferred such as paper or plastic, and a clean retransfer image could be obtained. Moreover, since the sheet does not move much and can be fixedly retransferred, there is an advantage that a good retransfer image can be easily obtained.

By the way, the thickness of the surface treatment agent is set to 1 μm.
When changed to m, 3 μm, 5 μm, 5 μm, 3 μm,
The retransfer property was good in the order of 1 μm. It is considered that this is because the larger the thickness, the larger the absolute amount of elongation.

Further, the energy applied to the thermal head is 25
At mj / mm ² , the energy was excessive and the adhesive force between the ink image and the surface treatment agent became too large, resulting in poor retransferability, but at 23 mj / mm ² , both the print quality and retransfer quality were good. became. However, when the amount of silicone added is 1% to 3%, a surface treatment agent having a contact angle with water of 105 to 107 ° can be obtained.
Even with mj / mm ² , good retransferability can be obtained.

That is, if the amount of silicone added is determined according to the energy applied to the thermal head, good thermal transfer quality and retransfer quality can be obtained.

Example 2 A nylon film having a thickness of 100 μm was used, and a surface treatment agent having the following composition was applied onto the nylon film, and the contact angle with water was 8:
At 5 to 90 °, a retransfer sheet having a smooth surface and a coefficient of static friction of about 0.45 was obtained. The elongation of this surface treatment agent is 440%.

Surface treatment agent composition parts by weight acrylic / colloidal silica 100 [WONCOAT DV-767 manufactured by Dainippon Ink and Chemicals, Inc.] Silicone 3 [KP-316 manufactured by Shin-Etsu Chemical Co., Ltd.] and obtained in this manner A dry transfer material was manufactured in the same manner as in Example 1 using the retransfer sheet thus prepared, and a retransfer image was formed on the transfer target by pressure-sensitive retransfer, and a clean retransfer image could be obtained. ..

Since the contact angle of water of acrylic / colloidal silica alone in the above composition is 50 °, silicone is added even if a material having a surface treatment agent composition of 80 ° or less is used. Thus, it was proved that a surface treating agent at 80 to 120 ° with which good retransfer quality was obtained was obtained.

Example 3 A polypropylene film having a thickness of 50 μm was coated with a surface treatment agent having the following composition, and the contact angle with water was 108 to 110 °, and the coefficient of static friction was 0.36. A retransfer sheet of a certain degree was obtained. The elongation of this surface treatment agent is 650%
Is.

Surface treatment agent composition parts by weight Ethylene-vinyl acetate copolymer 100 [EVAFLEX640 manufactured by DuPont Mitsui Polychemicals Co., Ltd.] Silicone 1 [KS-841 manufactured by Shin-Etsu Chemical Co., Ltd.] Curing agent 0.03 [Shin-Etsu Chemical] PL-8] Toluene 900 manufactured by Kogyo Co., Ltd. Then, using the retransfer sheet thus obtained, a dry transfer material is manufactured in the same manner as in Example 1, and a retransfer image is sensed on the transfer target. When formed by pressure retransfer, a clean retransfer image could be obtained.

[0044]

As is apparent from the above description, when a dry transfer material is produced by using a printing device such as a thermal transfer type printer, a typewriter, and a word processor, the dry transfer material is printed on the retransfer sheet. By using the surface treatment agent according to the present invention, it becomes possible to satisfactorily retransfer a transfer image printed on a surface having better wettability than before. Therefore, the thermal transfer energy can be reduced and a clear printed image can be obtained.

Since the wettability of the surface treatment agent can be adjusted by adjusting the amount of silicone added in accordance with the applied energy during heat transfer, optimum heat transfer quality and retransfer quality can be obtained.

In addition, it becomes possible to use a substance having a contact angle with water of 80 ° or less, which has not been available until now.

Further, since the adhesion of the ink image is large,
It has good scratch resistance and is easy to handle.

Further, since the coefficient of static friction can be increased, the sheet can be easily fixed during retransfer, and a complete retransfer image can be formed.

By the way, when the coefficient of static friction is 0.25 or more,
If the surface treating agent having a contact angle with water of 80 to 120 ° is used and ethylene-vinyl acetate copolymer and polyethylene are used as the main components of the surface treating agent, the above effect can be more certain. it can.

[Brief description of drawings]

FIG. 1 is a 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 Layer 13 Ink Image

Claims (1)

[Claims] 1. A retransfer sheet for producing a dry transfer agent produced by a thermal transfer method, wherein a surface treatment agent formed on one surface of the sheet is formed.