JPH03178493A - Retransfer 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 whose tensile strength is within a predetermined range on the transfer type release layer. CONSTITUTION:A transfer type release layer 12 is provided to the single surface of a sheet base material 11 and a surface treatment agent layer 13 to which tensile strength of 1 - 100 kg/cm<2> is imparted is provided thereon. The main component of the transfer type release layer 12 is set to wax and the cohesive force thereof is made lower than that of the surface treatment agent layer 13 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 on 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 applies pressure-sensitive transfer of characters, symbols, figures, etc. onto the surface of an object to be transferred.

It relates to retransfer sheets for dry transfer materials that form figures, etc., and in particular to retransfer sheets for dry transfer materials produced by printing and thermal transfer using printing devices such as thermal transfer printers, typewriters, word processors, etc. It is.

[Prior Art] A report on a basic sheet capable of producing a dry transfer material using a thermal transfer method was published in Japanese Patent Application No. 61-275537.
It has been made into a number.

In this report, a coating layer made of silicone resin is applied to the surface of a film made of polyethylene, polypropylene, fluororesin, etc., or paper, metal foil, or plastic film having a smooth surface with a contact angle of at least 95'' to water. A sheet formed with this is used.

In order to form an image on a sheet having a contact angle of 95'' or more (particularly 105' or more) by thermal transfer,
In addition to reducing the surface tension of the ink and making it wet onto the sheet, 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, so the temperature of the ink must be lowered. need to be high. Therefore,
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 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, Japanese Patent Application No. 80127/1983
There have been reports of an adhesive layer being provided on a sheet separately from the transfer pattern.

[Problems to be Solved by the Invention] 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 with a releasable coating layer made of silicone resin, it is necessary to apply two types of coating, the coating layer and the adhesive layer, and whichever is applied first, it is necessary to apply the coating afterwards. There is a good chance that it will have an impact when That is,
If you apply the silicone first, it will cause splatter when applying the adhesive.On the other hand, if you apply the adhesive first, it will become sticky and difficult to apply, so to prevent this stickiness, release paper is attached. However, coating is difficult due to its thickness. Even if it were successfully manufactured, since the adhesive layer is only present in a part of the image, the entire area around the image is not fixed, so the sheet will still move and it will be difficult to form a perfect image. be.

In any case, the surface treatment agents for retransfer sheets that have been reported so far do not retransfer along with the ink image from the sheet base, but improve the releasability between the retransfer sheet and the ink image. It was something. Therefore, it was necessary to reduce the wettability of the surface and weaken the adhesion between the ink image and the retransfer sheet. for that,
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 this background, and its first objective is to provide a retransfer sheet that facilitates the fixation of the sheet during retransfer and prevents movement. It is in.

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 allows easy confirmation of whether an ink image has been retransferred.

Furthermore, a sixth object of the present invention is to provide a retransfer sheet that can improve the scratch resistance of a retransferred ink image.

The seventh 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 good pressure-sensitive retransferability. It is in.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a transfer mold female layer on one side of a sheet base material, and a 1 kg/
It is characterized by providing a surface treatment agent layer having a tensile strength of CD or more and 100 kg/cm2 or less.

Further, the main component of the transfer type female mold 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 higher. By using a surface treatment agent having a melt viscosity of 1000 poise or more at 100° C., the object can be advantageously achieved.

[Function] For example, as shown in FIG.
, 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 re-transfer, and so that it can be easily manufactured into a dry transfer material using heat-sensitive 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, polysulfone, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, ionomer, and the like.

Next, the transfer mold female layer 12 formed on one surface of the base material 11 is made of vegetable waxes such as candelilla wax, carnauba wax, and rice wax; animal waxes such as beeswax and lanolin; montan wax, ceresin, etc. mineral waxes; petroleum waxes such as paraffin wax and microcrystalline wax; synthetic waxes such as Fischer-Tropsch wax and polyethylene wax;
It is composed of one or more types of waxes.

Further, in order to adjust the cohesive force, adhesive force, and film strength of the transfer mold female layer 12, a resin such as polyethylene, ethylene-vinyl acetate copolymer, cellulose, or ionomer polyvinyl alcohol may be added.

The thus obtained transfer type female mold layer 12 is coated with a surface treatment agent 13.
, the cohesive force is smaller than that of the ink image 14, and therefore, as shown in FIG.
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 female layer, it is no longer necessary to consider mold releasability, so the selection range of materials used for surface treatment agents has been increased. Not only is the area expanded, but the pressure-sensitive retransferability is also very good. Furthermore, unlike the generally used mold release layer, the transfer mold female layer can improve the surface wettability, thereby eliminating problems such as repelling of the surface treatment agent coating.

Note that the formed transfer mold female layer 12 is preferably transparent so that the color of the transferred image does not change.

The surface treatment agent layer 13 formed on the transfer mold female layer 12 has a tensile strength of 1 kg/cd or more and 100 k
It is desirable that it be less than g/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 be transferred just by applying pressure, 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 it will peel off just by bending the sheet.
A tensile strength of 00 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 retransferred to the surface treatment agent and the surface treatment agent, so the wettability of the surface treatment agent is completely taken into consideration. There will be no need for it. Therefore, a good heat-sensitive transfer image can be obtained with low energy, and a retransfer sheet with good abrasion resistance and strong 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 the images had to be transferred in layers. Therefore, there is a problem in that the previously transferred image is scraped off by the next transfer, especially by the head, 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 is increased, so that it becomes possible to thermally transfer large images in a connected state.

In addition, the advantage of retransferring the entire surface treatment agent is that since the surface treatment agent is also retransferred along with the ink image, a complete retransferred image can be formed without any residual ink, and whether the retransfer has been performed or not This makes it easier to confirm, and −
The surface treatment agent retransferred to g serves as a protective layer for the ink image and improves the scratch resistance of the retransferred image.

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.

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

When using these resins as the main component, if they are dissolved in a solvent or used as a hot melt, the tensile strength will become too large, so emulsions,
It is better to use it as a finely dispersed product such as a suspension.

In addition, fillers may be added to adjust tensile strength and adhesive strength. The surface treatment agent layer formed is preferably transparent so that the colors of both transferred images do not change.

By providing such a surface treatment agent on the sheet, thermal transfer properties, retransfer properties, scratch resistance, image adhesion during handling, and retransfer ■! It is possible to obtain a retransfer sheet with good fixation of the sheet of I, ease of confirming whether retransfer has been performed, and scratch resistance of the retransfer image.

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. However, it is particularly desirable to use an ink ribbon with a two-layer structure consisting of a transferability adjusting layer and an ink layer, which further improves heat-sensitive transferability and pressure-sensitive retransferability. This transferability adjustment layer is provided as a top coat layer on the ink layer, and is a layer that has higher heat-sensitive adhesiveness, hardness, viscosity, and cohesive force than the ink layer, and thus has poor wettability. The heat-sensitive transfer properties onto the retransfer sheet are significantly improved, and pressure-sensitive retransfer can be performed in one piece. 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 includes various changes, modifications, and changes 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 the like 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. The contact angle with water was 39" and the coefficient of static friction was 0.
A retransfer sheet with a smooth surface and no problems in coating was obtained. The tensile strength of this surface treatment agent is approximately 20 kg/c
m2, the melt viscosity at 150°C is about 2000-400
It is 0 poise.

Composition of transfer mold release agent: Parts by weight Low molecular weight polyethylene 30 [Sunwax E-300 manufactured by Sanyo Chemical Industries, Ltd.] Toluene 70 Parts by weight of surface treatment agent Polyethylene
100 [Chemivar M-2001 manufactured by Mitsui Petrochemical Industries, Ltd.] A heat-sensitive transfer word processor (P-touch manufactured by Brother Industries, Ltd.) was placed on the retransfer sheet thus obtained.
) to obtain a dry transfer material having a desired transferred image. At that time, it was possible to reduce energy compared to the conventional method and to obtain a good transferred image. Then, using this obtained dry transfer material, paper,
When pressure-sensitive retransfer was performed on a material to be transferred such as plastic, a clear retransfer image could be obtained and the retransferability was also good. 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, it is easy to check whether the ink image has been retransferred.Since the surface treatment agent covers the retransferred ink, the scratch resistance of the retransferred image is also improved. It got better.

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 having a smooth surface with a contact spread with water of 76° and a positive friction coefficient of about 0°77 was obtained.

The tensile strength of this surface treatment agent is 15 kg/cm2, and 1
The melt viscosity at 50° C. is approximately 5000 poise.

Composition of transfer mold release agent Parts by weight Polyethylene wax 100 [Chemivar W-200 manufactured by Mitsui Ishiura Chemical Industries ■] Surface treatment agent composition Parts by weight Ionomer 100 [Chemivar 5A-100 manufactured by Mitsui Petrochemical Industries ■] Using the obtained retransfer sheet, a dry transfer material was produced in the same manner as in Example 1, and a retransfer image was formed on the transfer object by pressure-sensitive retransfer, and a clear retransfer image could be obtained. .

Comparative Example 1 While using the surface treatment agent of Example 1, a printing test and a pressure-sensitive retransfer test were conducted in the same manner as in Example 1 using a retransfer sheet on which no transfer type female layer was formed. The pressure-sensitive retransferability was poor compared to Example 1, specifically, the mold release property of the surface treatment agent layer was poor, and a little force and perseverance were required during pressure-sensitive retransfer.

[Effects of the Invention] As is clear from the above description, when producing a dry transfer material 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 female layer is provided, and on the transfer mold female 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 100°C at 100°C.
By using a surface treatment agent with 0 poise or more,
Since a retransfer sheet can be manufactured without considering wettability, a good transfer image can be formed with low energy.

Therefore, since the adhesive force is increased, the abrasion resistance is improved, and the coefficient of static friction can also be increased, making it easier to fix the sheet during retransfer. Furthermore, since the surface treatment agent is also pressure-sensitively retransferred, it is easy to confirm whether pressure-sensitively retransferred has been performed, and the retransfer quality is also extremely good. Furthermore, by providing a transfer mold female layer, there is no need to consider the releasability of the surface treatment agent, and as a result, the range of selection of 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 serves as a protective layer, the scratch resistance of the retransferred image is also significantly improved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional configuration diagram showing an example of a retransfer sheet according to the present invention, and FIG. 2 is a diagram showing a state of pressure-sensitive retransfer. In the figure, 10 is a retransfer sheet, 11 is a sheet length material, 12 is a transfer mold female 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 female layer is formed on one surface of the sheet, and a 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 comprising a surface treatment agent layer as described below. 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.