JPH0990667A - Electrophotographic decal transfer material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer material having improved water resistance, suppressing curl in an environment at a low humidity and preventing blister due to water in the base paper at the time of press fixation under heating. SOLUTION: When the front and rear sides of a paper-base substrate 11 are coated with polymer resins to obtain the electrophotographic decal transfer material, at least an adhesive layer 12 and a transfer layer 14 or at least the adhesive layer 12, a releasing layer 13 and the transfer layer 14 are formed on one side of the substrate 11 and a backing layer 15 is formed on the other side so that the substrate is partially exposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can retransfer an obtained toner image to another final transfer material in an apparatus for forming an image by using toner such as an electrophotographic apparatus and an electrostatic recording apparatus. Copy transfer material for electronic photography.

[0002]

2. Description of the Related Art Conventionally, it has been widely known to transfer an image three-dimensionally by using a technique called copy-drawing. For example, a base material such as paper is coated with a water-soluble adhesive represented by dextrin, A required image is formed on this coating film using acrylic ink by screen printing, etc., the paper with this image is dipped in water to dissolve the dextrin, and the acrylic ink image floating in water is made into a three-dimensional object such as pottery. The water pressure transfer method of copying by water pressure is widely known. An example of a direct application of the transfer paper used in this method to electrophotography is Templin manufactured by Muto Kogyo. This transfer material is made by forming a film of dextrin on rice paper as a transfer material,
This is applied to an electrophotographic device to form a toner image on the surface of the dextrin, and then this transfer material is passed through an organic solvent that can soften the resin in the toner, and transferred to the transfer medium that is the object of retransfer to the toner image. After applying this adhesive force, the transfer material is brought into close contact so that the toner image faces the retransfer medium, and then water is applied from the back surface of the paper to dissolve the dextrin film and transfer only the toner image. Is.

However, with a transfer material formed by forming a water-soluble coating film on such an opaque paper, not only is it difficult to align the position at the time of retransfer, but also the influence of moisture in the atmosphere causes the image to be formed before image formation. There is a problem that the surface of the transfer material is softened and the softened dextrin adheres to the photosensitive drum or the like in the electrophotographic apparatus. Further, as described above, since it is sensitive to moisture in the air, it expands and shrinks greatly with respect to the amount of moisture, causing unnecessary curling of the transfer material, which considerably deteriorates the sheet conveyance property in the apparatus.

[0004] To solve the above two problems,
In 086, there is proposed a retransfer material using polyvinyl alcohol, which is a saponified product of vinyl acetate, instead of dextrin. In the transfer material proposed here, an acrylic resin film is formed on a paper coated with silicone resin, and then a mixture of Nichika Chemical Casesol 0-5 and a silicone defoaming agent is coated on it. The retransfer itself was carried out by forming a toner image on this coating film with an electrophotographic device and then peeling off this caser film from the base material so that the toner image directly faces the retransfer medium. Overlap.

By applying heat and pressure, the resin in the toner image is softened to obtain the adhesive force to the retransfer medium, and after cooling, 80% of ethyl alcohol is added from the rear surface of the caser film.
% Aqueous solution to reduce the adhesive force between the caser film and the toner image to complete the retransfer.

According to this method, since the thin film having the toner image is peeled off from the base material, it becomes a substantially transparent film, and the alignment is easy.

[0007]

However, in the above-mentioned conventional example, since the coating material used is a partial saponification product of vinyl acetate, it is sensitive to moisture in the air like temprin. Yes, there is a problem that the water resistance is significantly inferior, further, a problem that a residual coating film occurs when the coating film is peeled off by applying an alcohol solvent, and also because silicone release paper is used as the base paper. Peeling easily occurs at the interface between the acrylic resin layer and the silicone layer, peeling in the electrophotographic device, and further, when the polyvinyl alcohol layer is peeled off, the acrylic resin is also peeled off together with the copy picture. There is a problem that it cannot be achieved.

In order to solve these problems, a commonly used coated paper is used as a base paper, an adhesive layer made of acrylic resin is provided on one side of the base paper, and a transfer layer having a copying function is provided on the adhesive layer. A possible method is to change the water-soluble polymer of the transfer layer used to a water-resistant type.

However, even in this case, since the back side of the paper exposes the surface of the paper, the paper may be significantly curled depending on the environment in which the transfer material is left. Furthermore,
There is a possibility that the fixing roller may be wrapped around the fixing roller by heat shrinkage during fixing in the electrophotographic apparatus.

Therefore, the present inventor has thought that the problem of curling and winding can be prevented by forming the backing layer from resin.

However, depending on the use conditions, this transfer material may also cause the water in the coated base paper to evaporate rapidly due to the heating for fixing, resulting in swelling of the paper. Further, in the case of paper coated with resin on both sides by the silicone oil used at the time of fixing in the current color copying machine, slipping may occur and the conveyance to the fixing roller pair may be defective.

Accordingly, an object of the present invention is to provide an electrophotographic transfer material for electrophotography which has improved water resistance, a reduced amount of curl left, and which does not cause thermal swelling during fixing and conveyance failure to a fixing pair. It is in.

[0013]

Means for Solving the Problems That is, the present invention relates to a copy transfer material for electrophotography, which is obtained by applying a polymer resin coating to the front and back of a base material mainly composed of paper, and at least an adhesive layer on one side, This is a copy transfer material for electrophotography, characterized in that two backing layers of the transfer layer, a backing layer is provided on the rugged surface, and the backing layer partially exposes the surface of the substrate.

The present invention also relates to an electrophotographic copying picture transfer material comprising a base material mainly made of paper and a polymer resin coating on the front and back surfaces thereof, and at least an adhesive layer, a release layer and a transfer layer on one surface. No. 3, a backing layer is applied to the rough surface, and the backing layer partially exposes the surface of the base material, which is a copy transfer material for electrophotography.

In the present invention, the coverage of the resin film of the backing layer on the substrate is preferably 10% or more and 95% or less. Further, it is preferable that the backing layer is made of a polymer resin material formed in a mesh shape on the surface of the base material. In addition, the transfer layer preferably contains a water-soluble polymer, more preferably the water-soluble polymer is polyvinyl alcohol, and the polyvinyl alcohol contains polyvinyl alcohol and polyvinyl acetate in which 95% or more of polyvinyl acetate is saponified. % Of saponified polyvinyl alcohol, and the content of polyvinyl alcohol having a saponification degree of 95% or more is preferably 25% by weight or more and less than 75% by weight as a solid content.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a copy transfer material 1 for electrophotography according to the present invention.
FIG. 3 is a schematic cross-sectional view showing the layer structure of FIG. Reference numeral 11 denotes a base material of the transfer material 1, which is a medium or high-quality plain paper, or a paper in which one or both surfaces of these papers are coated with a surface layer for sealing, so-called coated paper, art paper, or the like. Is used. In the case of paper, the basis weight is preferably 30 g / m ² or more, 4
It is more preferably 5 g / m ² or more. If the paper weight is less than 30 g / m ² , it is difficult to ensure the transportability of the electrophotographic apparatus even if the coating resin film is thickened. The basis weight is preferably from 200 g / m ² or less, more preferably 150 g / m ² or less. Two
If it exceeds 00 g / m ² , the rigidity of the base paper is too high.
Transportability tends to be poor. Further, this base paper is added with an inorganic salt such as sodium chloride in an amount of 0.2 to 4% by weight in order to maintain good image transferability in an electrophotographic apparatus, and has a volume resistance value of 20 ° C. and a 65% RH environment. It is preferably adjusted to 10 ⁸ to 10 ¹⁰ Ω · cm by leaving it for 24 hours.

Reference numeral 12 denotes an adhesive layer, which is provided to prevent the release layer 13 and the transfer layer 14 to be applied later, or a combination thereof, from being easily peeled off in the electrophotographic apparatus. Has been. Examples of the material used include an aqueous acrylic emulsion, water-soluble acrylic, water-soluble polyester, 6.6 nylon, polyacrylonitrile, and an acrylic resin soluble in an organic solvent. Also,
If necessary, fine powder of amorphous silicon dioxide having oil absorbing ability, so-called silica can be mixed. This silica is used for the purpose of increasing the adhesive force of the upper release layer 13 and for absorbing moisture evaporated from the inside of the coated paper, and the particle size thereof is preferably 0.5 to 10 μm.

Next, 13 is a release layer, which is mainly composed of polyvinyl alcohol, which is a saponification product of polyvinyl acetate, and whose saponification degree is 95% or more, preferably 98%.
The above are more preferred. When polyvinyl alcohol having a saponification degree of 90% or less is used, it is also possible to use a release agent mixed with a small amount of water-soluble silicone (generally a surface active agent such as an antifoaming agent). is there. However, it is difficult to use polyvinyl alcohol having a saponification degree of less than 70% in terms of water resistance. However, when the above silicone is mixed, there is no problem even if the composition of the transfer layer 14 is the same.

Further, the mutual material selection of the release layer 13 and the adhesive layer 12 is influenced by the adhesive force thereof, and the adhesive strength is 1.5 g at 90 ° peeling so that the peeling layer 13 and the adhesive layer 12 are not peeled at least by the conveying force in the electrophotographic apparatus. / Cm or more is preferable, and the transfer layer 14 and the release layer 13 described later are preferably used.
It is preferably 6 g / cm or less so that the film does not break when the retransfer film layer consisting of is peeled from the substrate.

Next, the transfer layer 14 will be described. This layer receives the toner image by the electrophotographic apparatus, holds the toner image at least until it enters the retransfer step by heating, and at the time of retransfer, it is sufficient. It is required to have excellent toner peeling performance. It is also required to have sufficient water resistance compared to the prior art. That is, it is necessary that water permeability is excellent while ensuring the solvent permeability during retransfer. Specifically, the transfer layer is formed by mixing polyvinyl alcohol obtained by saponifying polyvinyl acetate at 95% or more with polyvinyl alcohol obtained by saponifying polyvinyl acetate at 90% or less. The mixing ratio is preferably such that the content of polyvinyl alcohol having a high degree of saponification of 95% or more is 10% by weight or more, more preferably 25% by weight or more, as a solid content ratio. If less than 10% by weight, 90
The water-soluble property, which is a characteristic of polyvinyl alcohol having a low saponification degree of not more than%, appears strongly, and the surface layer may be melted out in a high temperature environment, possibly contaminating the members in the electrophotographic apparatus. Furthermore, high saponification degree polyvinyl alcohol is 7
When the content is 5% by weight or more, the alignment of the linear polymer forming the film itself has high regularity as in the case of the cellulose film, so that the film shrinkage may increase with a change in the amount of water in the air. That is, the polyvinyl alcohol having a high degree of saponification is more preferably 25% by weight or more and less than 75% by weight as a solid content ratio. If necessary, a cationic or nonionic antistatic agent can be added to the transfer layer 14 to improve electrophotographic transferability. The amount of antistatic agent may be adjusted so that the target surface specific resistance value is 10 ⁸ to 10 ¹² / □. Further, an inorganic white pigment such as silica powder may be mixed in order to secure the paper feeding property and the toner fixing property. When forming this layer together with the release layer, the amount of silica powder may be increased and silicone may be mixed.

With respect to the film thickness of each layer, the adhesive layer 12 is preferably a thin layer so that the film does not split and peel off.
It is preferably not less than 10 μm and not more than 10 μm. If it is less than 2 μm, unevenness is likely to occur, and if it exceeds 10 μm, intralayer peeling is likely to occur.
However, when silica powder is mixed in the adhesive layer, the film strength increases, so that there is no problem even if it is formed to 15 μm. The release layer 13 has a role of a primer layer of the transfer layer 14 and a role of achieving sufficient peeling at the interface between this layer and the adhesive layer 12, and its thickness is preferably 2 μm or more and 6 μm or less. If it exceeds 6 μm, the shrinkage of the layer due to moisture is strong and curling is likely to occur, and if it is less than 2 μm, unevenness is likely to occur.

The thickness of the transfer layer 14 is preferably 3 μm or more. If it is thinner than this, insufficient strength such as breakage of the film when peeled from the substrate is likely to occur. Also, 50μ
m or less is preferable. If the thickness is larger than this, the film after peeling becomes hard, and the reproducibility of the curved surface at the time of retransfer tends to decrease. A more preferable film thickness is 4 μm or more and 40 μm or less.

Next, the backing layer 15 will be described. This layer is provided in order to reduce some curl that occurs when the water-soluble polymer layer of the transfer layer 14 and the release layer 13 expands and contracts due to the environment in which it is left. As the material of the backing layer, it is possible to use the binder resin used for the adhesive layer 12, or it is possible to use any organic solvent-soluble thermoplastic or thermosetting resin such as polyester, It is possible to use urethane, phenol, acrylic, epoxy, butyral, vinyl chloride-based resin, or a mixture thereof. In the present invention, as a further configuration, as shown in FIG. 3, the coating shape of this layer is not a uniform surface but a coated base paper 1
The surface on the B side of 1 is meshed so as not to be partially covered with the coating layer. That is, when the base paper 11 is completely covered with the resin on the B side as well, the water inside the paper suddenly becomes steam when heated by the heating and fixing device in the electrophotographic apparatus, which is a blister of the paper itself. Will occur.
To prevent this, an opening is provided on the back surface. The aperture ratio is 10% or more 9 when the coating layer covers the base paper.
It may be 5% or less, preferably 20% or more and 90% or less, and more preferably 25 to 80%. It is necessary for this coverage to hold the size of the minimum required opening, and an opening of 0.01 mm ² or more and 25 mm ² or less may be used. If the opening size exceeds 25 mm ² , the curl prevention effect is insufficient, and if it is less than 0.01 mm ² , sufficient escape of water vapor cannot be achieved.

Next, the thickness of this coating layer is 1 to 20 μm.
Is preferable, and 2-20 micrometers is more preferable. If it exceeds 20 μm, curling occurs due to shrinkage of the resin during coating and drying, and if it is less than 1 μm, the curl preventing effect is insufficient.

Further, a fine powder of amorphous silicon dioxide (silica) may be mixed in this layer as well, and preferably 2 to 5 parts by weight of silica powder having a diameter of 0.5 to 10 μm is used. It becomes a stable coating layer.

Next, the electrophotographic toner applicable to the copy transfer material of the present invention will be described in detail. Basically, for electrophotography, which contains dyes and pigments such as yellow, cyan and magenta in addition to carbon black in a binder resin mainly composed of a resin such as styrene-acrylic copolymer, styrene-butadiene copolymer, epoxy and polyester. Toner is available. Among them, the color toners described below are particularly capable of further bringing out the effects of the copy transfer material of the present invention.

The toner powder for this color electrophotographic apparatus is
It is necessary that the toner has good meltability and color mixing when heat is applied, and a sharp melt toner having a low softening point and a short melting time is preferable.

By using a sharp melt toner, it is possible to widen the color reproduction range of the copy and obtain a good color copy faithful to the multicolor image of the original.

Such a sharp-melt toner may be a binder resin such as polyester resin or styrene-acrylic resin, a coloring agent (dye, sublimable dye),
The toner is manufactured by melt-kneading, pulverizing and classifying a charge control agent and the like. If necessary, an external addition step of adding various external additives to the toner may be added.

Considering the fixing property and the sharp melt property, the color toner preferably uses a polyester resin as a binder resin. The sharp melt polyester resin is a polymer compound having an ester bond in the main chain of a molecule synthesized from a diol compound and a dicarboxylic acid. In particular,

[0032]

Embedded image (In the formula, R is an ethylene or propylene group, x,
y is a positive integer of 1 or more, and the average value of x + y is 2 to 10. ), A bisphenol derivative represented by the formula (1) or a substituted product thereof is used as a diol component, and a carboxylic acid component composed of a carboxylic acid having a valence of 2 or more or an acid anhydride thereof or a lower alkyl ester thereof (eg fumaric acid
A polyester resin obtained by at least co-condensation polymerization of maleic acid, maleic anhydride, phthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid, etc.) is more preferable since it has sharp melting properties.

The softening point of the sharp melt polyester resin is preferably 60 to 120 ° C. FIG. 2 shows the softening point characteristics of the toner containing the sharp melt polyester resin as a binder resin.

A flow tester CFT-500 type (manufactured by Shimadzu Corporation) was used, and the diameter of the die (nozzle) was 0.5 mm.
A plunger descent-temperature curve of toner drawn when a 50 kg extrusion load is applied to a thickness of 1.0 mm, the preheating time is 300 seconds, the preheating time is 300 seconds, and the temperature is increased at a constant speed of 5 ° C./min ( (Hereinafter referred to as a softening S-shaped curve). The toner used as the sample is a fine powder precisely weighed 1 to 3 g, and the cross-sectional area of the plunger is 10 cm ² . The softening S-shaped curve is as shown in FIG. As the temperature rises at a constant rate, the toner is gradually heated and begins to flow (plunger descending A → B). When the temperature is further increased, the toner in the molten state flows out greatly (B → C → D), the plunger descent stops, and the process ends (D → E).

The height H of the S-shaped curve indicates the total outflow amount, and H /
The temperature T ₀ corresponding to point C of 2 indicates the softening point of the toner.

Such a sharp melt type toner or resin means that the temperature at which the melt viscosity is 10 ⁵ is T ₁ ,
When the temperature when 5 × 10 ⁴ cp is shown is T ₂ , T ₁ = 90 to 150 ° C. | ΔT | = | T ₁ −T ₂ | = 5 to
A resin that satisfies the condition of 30 ° C.

The sharp-melting toner or resin having these temperature-melt viscosity characteristics is characterized by extremely sharply decreasing the viscosity when heated. Such a decrease in viscosity causes appropriate mixing between the uppermost toner layer and the lowermost toner layer, and furthermore, sharply increases the transparency of the toner layer itself and causes good color-reduction mixing.

Next, specific examples of the present invention will be described. In the specific examples, parts indicate parts by weight.

[Example 1] A so-called coated paper obtained by sealing both surfaces of a high-quality paper having a basis weight of 80 g / m ^{2 with} a coating liquid consisting of starch and calcium carbonate was used as a base paper, and a copy transfer was made according to the following formulation. Material A was obtained.

<Adhesive Layer> 100 parts of acrylic resin (cover coat resin LO-316, manufactured by Kyowa Kagaku Co., Ltd.) Toluene 100 parts Silica (FPS-3, manufactured by Shionogi Pharmaceutical Co., Ltd.) 4 parts 10g
The coating film was formed so that it would be / m ² . The thickness of the obtained layer was 9 μm.

<Release Layer> High saponification degree polyvinyl alcohol (saponification degree 99%) Kuraray Poval PVA110 aqueous solution (solid content 14%) 20 parts Water Using a coating solution consisting of 100 parts, a thickness of 4 using a screen coater.
A coating film was formed on the adhesive layer to have a thickness of μm.

<Transfer Layer> High Saponification Polyvinyl Alcohol (Saponification Degree 99%) Kuraray Poval PVA110 Aqueous Solution (Solid Content 14%) 50 parts Low Saponification Polyvinyl Alcohol (Saponification Degree 88%) Casesol 0-5 Aqueous Solution (Solid Content 14%) %) Nichika Kagaku 50 parts Antistatic agent (Cation AB, NOF Corporation) 2.5 parts Silica (FPS-2, Shionogi Pharmaceutical Co., Ltd.) 6 parts Water 5 parts Using a coating liquid, a screen coater Thickness 7
A coating film was formed on the release layer so as to have a thickness of μm.

<Backing Layer> Acrylic resin (plus size LO-170, manufactured by Kyowa Chemical Co., Ltd.) 100 parts Toluene 100 parts Silica (FPS-3, manufactured by Shionogi & Co., Ltd.) 4 parts Using a coating liquid, a screen coater is used. 70%
A coating film was formed on the surface of the base paper opposite to the side on which the transfer layer was formed, using a screen printing plate so as to have a coating weight of 6 g / m ² . The thickness of the obtained layer was 4 μm. The coverage of the coating layer was 75%, and the area of one opening was 0.36 mm ² .

The adhesive force between the adhesive layer and the release layer of the obtained electrophotographic copy transfer material A was 2 g / cm. The surface resistivity of the transfer layer was 10 ¹¹ Ω / □.

When the above transfer material was color-copied with a CLC700 (Canon Color Copier) manufactured by Canon, a good color image was obtained without peeling of the coating film. Furthermore, when this copy transfer material A was left for 5 minutes in an environment of 23 ° C. and 5%, the edge of the transfer material was lifted up with the transfer layer facing upward, and a square average of 5 mm occurred. When copying was performed with the above-mentioned copying machine in this state, there was no problem in paper passing performance.

Further, the integrated film of the transfer layer having the toner image and the release layer is peeled off from the transfer material A having the copied image, and the toner image is aligned on the prepared coated cardboard and heated to 110 ° C. The iron was used to press the film against the coated cardboard. Furthermore, when an 80% ethyl alcohol aqueous solution was applied from the release layer side, the polyvinyl alcohol film swelled without melting, and the toner image was self-separated and transferred to coated cardboard to complete the drawing.

Comparative Example 1 A transfer image transfer material B was obtained in the same manner as in Example 1 except that the coverage of the backing layer was 94%.

This copy picture transfer material B is used in the same manner as in A for CLC7.
Copies were made at 00. No significant blistering occurred in the heating and fixing section, but when copying continuously, the metal part of the fixing section rose in temperature, and a small amount of blistering occurred on the part of the transfer material that touched it, and the opening area was insufficient. It turned out that

Example 2 A copy transfer material C was obtained in the same manner as in Example 1 except that the backing layer coverage was 25% and the coating amount was 8 g / m ² .

When the same test as in Example 1 was carried out, the curl amount in the low humidity environment was as small as 6 mm on average because the coating amount was increased by lowering the coverage, and it was as good as in Example 1. I got the result.

Comparative Example 2 A copy transfer material D was obtained in the same manner as in Example 1 except that the coverage of the backing layer was 15% and the coating amount was 20 g / m ² (film thickness 21 μm). .

When the same test as in Example 1 was carried out, the coverage was lowered too much, so that waviness was generated not on the edges of the paper but on the whole, and the paper could not be passed in a low humidity environment.

[Example 3] A so-called coated paper in which both sides of a high-quality paper having a basis weight of 80 g / m ² were sealed with a coating liquid composed of starch and calcium carbonate was used as a base paper, and a copy transfer was made according to the following formulation. Material E was obtained.

<Adhesive Layer> 100 parts of acrylic resin (Covercoat resin LO-316, manufactured by Kyosho Chemical Co., Ltd.) Toluene 100 parts Silica (FPS-3, manufactured by Shionogi Pharmaceutical Co., Ltd.) 4 parts A coating solution was used, and a screen coater was used. 10g
The coating film was formed so that it would be / m ² . The thickness of the obtained layer was 9 μm.

<Transfer Layer> High Saponification Polyvinyl Alcohol (Saponification Degree 99%) Kuraray Poval PVA110 Aqueous Solution (Solid Content 14%) 50 Parts Low Saponification Polyvinyl Alcohol (Saponification Degree 88%) Casesol 0-5 Aqueous Solution (Solid Content 14%) %) Nika Chemical 50 parts Antistatic agent (Cation AB, NOF Corporation) 2.5 parts Silica (FPS-2, Shionogi Pharmaceutical Co., Ltd.) 6 parts Silicone (KM73, Shin-Etsu Chemical Co., Ltd.) 4 parts Water 5 parts Using a coating liquid
A coating film was formed on the adhesive layer so as to have a thickness of 2 μm.

<Backing Layer> Acrylic resin (plus size LO-170, manufactured by Kyowa Chemical Co., Ltd.) 100 parts Toluene 100 parts Silica (FPS-3, manufactured by Shionogi & Co., Ltd.) 4 parts Using a coating liquid, a screen coater is used. 80%
A coating film was formed on the surface of the base paper opposite to the side on which the transfer layer was formed using a screen printing plate so as to have a weight of 7 g / m ² . The thickness of the obtained layer was 5 μm. The coverage of the coating layer was 82%, and the area of one opening was 0.25 mm ² .

The adhesive force between the adhesive layer and the transfer layer of the obtained electrophotographic copy transfer material E was 3 g / cm. The surface resistivity of the transfer layer was 10 ¹¹ Ω / □.

When the above transfer material was color-copied with a CLC700 (Canon Color Copier) manufactured by Canon, a good color image was obtained without peeling of the coating film. Furthermore, when this copy transfer material E was left for 5 minutes in an environment of 23 ° C. and 5%, the edge of the transfer material was lifted up with the transfer layer facing upward, and a square average of 3 mm occurred. When copying was performed with the above-mentioned copying machine in this state, there was no problem in paper passing performance.

Further, the transfer layer film having the toner image is peeled off from the transfer material E having the copied image, and the film is coated on the prepared coated cardboard with the iron heated to 110 ° C. so that the toner image directly faces the coated cardboard. I pressed it against the cardboard. Furthermore, when an 80% ethyl alcohol aqueous solution was applied from the back surface of the transfer layer, the polyvinyl alcohol film swelled without melting, and the toner image was self-separated and transferred to coated cardboard to complete the drawing.

[0060]

As described above, according to the present invention, the water resistance is improved, and unnecessary curl in a low humidity environment is reduced.
In addition, a copy transfer material for electrophotography has been made possible in which blistering at the time of heat and pressure fixing due to moisture in the base paper is prevented.

[Brief description of drawings]

FIG. 1 is a schematic longitudinal sectional view of a copy transfer material of the present invention.

FIG. 2 is a melting characteristic diagram of a toner used in the transfer material of the present invention.

FIG. 3 is a schematic view showing an example of the shape of the backing layer of the copy transfer material of the present invention.

[Explanation of symbols]

 11 Base Material (Base Paper) 12 Adhesive Layer 13 Release Layer 14 Transfer Layer 15 Backing Layer

Claims (21)

[Claims] 1. A copy transfer material for electrophotography, comprising a base material mainly made of paper and a polymer resin coating on the front and back surfaces of the base material. At least one adhesive layer, two transfer layers, and a dent surface are provided on one side. A transfer material for electrophotography, comprising a backing layer, and the backing layer partially exposing the surface of the substrate. 2. The copy transfer material for electrophotography according to claim 1, wherein the coverage of the resin film of the backing layer with respect to the substrate is 10% or more and 95% or less. 3. The copy transfer material for electrophotography according to claim 2, wherein the backing layer is made of a polymer resin material formed in a mesh shape on the surface of the base material. 4. The copy transfer material for electrophotography according to claim 1, wherein the transfer layer and the adhesive layer can be separated at the interface. 5. The adhesive force between the adhesive layer and the transfer layer is 1.5 g / c.
The copy transfer material for electrophotography according to claim 1, which has a thickness of m or more and 6 g / cm or less. 6. The copy transfer material for electrophotography according to claim 1, wherein the transfer layer contains a water-soluble polymer. 7. The copy transfer material for electrophotography according to claim 6, wherein the water-soluble polymer is polyvinyl alcohol. 8. The transfer layer comprises polyvinyl alcohol and polyvinyl acetate which are obtained by saponifying polyvinyl acetate in an amount of 95% or more.
% Of saponified polyvinyl alcohol, and the content of polyvinyl alcohol having a saponification degree of 95% or more is 25% by weight or more and less than 75% by weight as a solid content. 9. The surface resistivity of the transfer layer is 20.degree.
10 under% RH environment ⁸ -10¹²It is Ω / □.
This is a copy transfer material for electrophotography. 10. A copy transfer material for electrophotography, comprising a polymer resin coating on the front and back of a paper-based substrate, comprising:
At least three layers of an adhesive layer, a release layer, and a transfer layer on one surface,
A copy transfer material for electrophotography, characterized in that a backing layer is applied to the rough surface, and the backing layer partially exposes the surface of the base material. 11. The copy transfer material for electrophotography according to claim 10, wherein the coverage of the resin film of the backing layer with respect to the substrate is 10% or more and 95% or less. 12. The copy transfer material for electrophotography according to claim 11, wherein the backing layer is made of a polymer resin material formed in a mesh shape on the surface of the base material. 13. The copy transfer material for electrophotography according to claim 10, wherein the release layer and the transfer layer are integrally separable from the adhesive layer. 14. The adhesive force between the adhesive layer and the release layer is 1.5 g /
The copy transfer material for electrophotography according to claim 10, having a size of not less than cm and not more than 6 g / cm. 15. The copy transfer material for electrophotography according to claim 10, wherein the transfer layer contains a water-soluble polymer. 16. The copy transfer material for electrophotography according to claim 15, wherein the water-soluble polymer is polyvinyl alcohol. 17. The transfer layer comprises polyvinyl alcohol and polyvinyl acetate obtained by saponifying polyvinyl acetate in an amount of 95% or more.
The polyvinyl alcohol containing 0% or less of saponified polyvinyl alcohol having a saponification degree of 95% or more is contained in a solid content of 25% by weight or more and less than 75% by weight.
The copy transfer material for electrophotography described in 0. 18. The surface resistivity of the transfer layer is 20.degree.
It is 10 ⁸ to 10 ¹² Ω / □ under a 5% RH environment.
The copy transfer material for electrophotography described in 0. 19. The copy transfer material for electrophotography according to claim 10, wherein the adhesive layer contains fine powder of silicon dioxide. 20. The copy transfer material for electrophotography according to claim 10, wherein the transfer layer contains fine powder of silicon dioxide. 21. The copy transfer material for electrophotography according to claim 10, wherein the backing layer contains fine powder of silicon dioxide.