JPH07306541A - Laminated film for formation of transparent resin layer on light-transmitting image,method for formation of transparentresin layer on light-transmitting image and light- transmitting-image support film provided with transparent resin layer on image face - Google Patents

Abstract

PURPOSE: To provide a laminate film forming a transparent resin layer on a translucent picture, which obtains a projection picture of high reproducing efficiency by improving the translucency of a toner picture, suppresses the terminal deformation of the transparent film base material of a translucent picture film and prevents the toner picture from being damaged by the trans lucent picture film. CONSTITUTION: In the laminate film for forming the transparent resin layer on the translucent picture obtained by sticking toner on one main face of the transparent film material, the laminate film 54 is laminated in the order of a cover film 53, a mold-released layer 52 and the resin layer 51 and the softening point of the resin layer is lower than that of the toner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate film used for forming a transparent resin layer on a transparent image, a method for forming a transparent resin layer on a transparent image, and a method for forming the same. The present invention relates to a translucent color image film having a transparent resin layer on the image surface obtained by the method.

[0002]

2. Description of the Related Art With the recent development of electrophotographic technology, an overhead projector (hereinafter referred to as "OH
"P". ) When forming a translucent image for projection,
Electrophotography has come into use. In this method, a black and chromatic color toner is deposited on a transparent film according to a desired pattern by an electrophotographic apparatus provided by various manufacturers to provide a translucent image film. However, when the translucent image film obtained by this method is actually projected, the transparency of the toner image is low and unclear, or the desired color image is not reproduced well on the screen, and There is a problem that an image in which the color is remarkably black gray is projected more than the color directly recognized on the film.

As one of the causes of such a problem,
The unevenness of the toner image surface scatters or irregularly reflects light to reduce the amount of light transmitted through the image surface, and a sufficient amount of light does not reach the projection screen, so that a clear and highly transparent image cannot be obtained. To be Such a problem is particularly noticeable in a translucent color image film using two or more color toners.

Therefore, in order to improve the sharpness and transparency of the projected image, a method of flattening the unevenness of the toner image surface by heating and pressing has been attempted. For example, there is a method in which a light-transmissive image film is directly passed between heating rolls to heat and press the image portion of the toner containing the thermoplastic resin. This method is excellent in that the unevenness of the image surface is flattened to suppress the scattering or irregular reflection of light as described above and increase the amount of light transmission. However, in this method, if the heating temperature is slightly higher than the predetermined temperature, the toner is transferred to the heating roll and the toner image is destroyed.

Therefore, as a method for flattening the unevenness of the image surface of the toner containing such a thermoplastic resin by heating / pressurizing, the following can be mentioned.

1. Japanese Patent Application Laid-Open No. 61-36756 In this publication, a transparent image surface obtained by adhering a color toner containing a thermoplastic resin on a transparent film substrate,
A cover film thinner than the transparent film substrate, specifically, a cover film having a thickness of 50 μm or less is superposed, and is conveyed by sandwiching between heated and pressurized rolls to flatten the unevenness of the image surface. , A method of peeling off the cover film after the image surface is cooled is described. This method is excellent in that the toner image can be prevented from being destroyed by the transfer of the toner to the roll. However, there were the following problems.

(1) After the cover film is peeled off, the toner is transferred to the cover film surface and the image is destroyed.

(2) When the translucent image film is stored by superimposing it, the image surface is scratched by the film laminated on the image surface.

Therefore, the following is a method for improving this method, while leaving the excellent point of the method of flattening by heating / pressurizing the unevenness of the image surface after superposing such a cover film on the toner image. Can be mentioned.

2. Japanese Unexamined Patent Publication No. 2-38090 discloses a transparent image surface obtained by adhering a color toner containing a thermoplastic resin on a transparent film substrate.
Laminate film composed of a cover film, a release agent, and a thermoplastic resin layer serving as a laminate layer is laminated so that the thermoplastic resin layer is in contact with the image surface, and heated and pressed by a roll to form unevenness of the toner image. After the flattening, the laminate layer is cooled and then the cover film is peeled off together with the release layer. This method is characterized in that a thermoplastic resin having a softening point higher than that of the toner is used as a laminate layer.

However, this method has the following problems.

(1) Since the toner itself is intended to be softened or deformed, the reproducibility of the image is improved in an image, particularly in a precision image in which the toner has a small particle size such as a color image and two or more kinds of toners are used. Lack.

(2) The toner itself is intended to be softened and deformed while maintaining a certain hardness of the thermoplastic resin, but in reality, the temperature and pressure of the heating roll or the like are controlled from above the laminate layer. Therefore, it is difficult to obtain an image with good reproduction accuracy.

(3) In order to sufficiently soften and deform the toner itself to make the surface smooth, it is necessary to heat the heating roll at a high temperature and a high pressure, so that the transparent film substrate is easily thermally deformed. .

[0015]

SUMMARY OF THE INVENTION The present invention solves the problems of the prior art by: a) a toner image having excellent light transmission properties, particularly a toner image which is remarkably clear in a color image b) a toner having high reproducibility Image c) Toner that can be laminated at low temperature and is free from the risk of thermal deformation of the transparent film substrate Image d) Toner that will not be scratched by the translucent image film that is overlaid even if stored Laminate film for forming a transparent resin layer on a translucent image, which enables projection of an image, a method for forming a transparent resin layer on a translucent image, and an image surface Provided is a translucent image film having a transparent resin layer.

[0016]

A first aspect of the present invention is shown in FIGS. That is, in the laminated film 54 for forming the transparent resin layer 51 on the transparent image 62 obtained by adhering the toner 63 on one main surface of the transparent film substrate 61, the laminated film 54 is ,
A cover film 53, a release layer 52, and a resin layer 51 are laminated in this order, and the softening point of the resin layer 51 is lower than the softening point of the toner 63.

In the present invention, the cover film has a function of supporting the release layer and the resin layer and heating the resin layer through the cover film when laminating an image.

The material of the cover film in the present invention is
A commonly used one is used. Preferably, the plastic film has sufficient strength for handling, heat resistance and strength that can withstand the pressing step involving heating, and the subsequent peeling step. Among such plastic films, a PET (polyethylene terephthalate) film, which is relatively inexpensive, has excellent strength and heat resistance, and has good thermal conductivity, is more preferable.

The thickness of the cover film in the present invention is
From the viewpoint of strength and curl prevention due to thermal deformation, preferably
25 μm or more. On the other hand, if it is too thick, the entire laminated film becomes thicker, so 100 μm or less is preferable. Also,
More preferably 25-75 μm, even more preferably 40-75 μm
Is the range. This is for the following reason. In the conventional laminating method, in order to flatten the unevenness of the toner image, it is necessary to efficiently transfer heat to the uneven portion, and a thin one having a thickness of 20 to 30 μm is actually used. However, in this case, there arises a problem that the laminated films stick to each other due to static electricity or stick to the heating roll in the laminating step. On the other hand, in the case of the present invention, it is not necessary to heat the toner so as to soften it, and therefore the cover film can be made relatively thick.

The release layer in the present invention is provided between the cover film and the resin layer in order to remove the cover film without damaging the resin layer.

The thickness of the release layer is preferably 0.5 to 25 μm,
The range is more preferably 3 to 10 μm. The reason for this is
If the thickness is less than 0.5 μm, the releasability will be insufficient and, conversely,
This is because if the thickness exceeds 25 μm, the entire laminated film becomes thick.

A general material is used for the release layer in the present invention. Preferably, the release layer contains a resin, and even after the cover film is removed, the release layer remains on the toner image together with the resin layer to form a two-layer laminate layer. The reason for this is that if a release layer containing a resin is left on the laminate layer, a laminate layer having sufficient strength to protect the toner image can be obtained. As a resin for the release layer, a polyvinyl butyral resin having excellent transparency and strength is preferable.

The resin layer in the present invention has a function of being softened and deformed by heat to fill the concave portion of the toner image and form a resin layer having a smooth outer surface on the image surface.

Therefore, the softening point of the resin layer must be lower than the softening point of the toner. This is because when the softening point of the resin layer is higher than the softening point of the toner, the resin layer does not sufficiently fill the concave portions of the toner image, and a laminate layer having a smooth outer surface cannot be formed, so that an image with good reproducibility is obtained. Because you can't get it. That is, the present invention contemplates the following. As described above, if the toner image surface is uneven, light is scattered or diffusely reflected and a sufficient amount of light does not reach the projection screen, so that a projection image with high reproducibility cannot be obtained. However, it is practically difficult to obtain an image with good reproducibility by softening and deforming the toner itself by controlling the temperature and pressure of the heating roll etc. while maintaining the resin layer with a certain hardness as in the past. Is. Therefore, the present invention does not intend to soften and deform the toner itself to flatten the unevenness of the toner image, but to soften and deform the resin layer by heat to fill the concave portion of the toner image, It is contemplated to form a smooth resin layer on the image surface.

The softening point of the resin layer of the present invention is preferably 40.
~ 130 ℃, more preferably 40 ~ 100 ℃, particularly preferably 40
It is in the range of ~ 80 ° C. When the softening point of the resin layer is in the range of 130 ° C. or lower, the heating temperature for attaching the toner images is
It is preferable because the temperature can be lower than 150 ° C. The reason for this is that when the heating temperature is 150 ° C. or higher, when a plastic film is used as the transparent film substrate of the translucent image film, the transparent film substrate curls due to heat and the image film is properly focused. Because it will be difficult. On the other hand, when the softening point of the resin layer is 40 ° C. or lower, sticking due to blocking occurs when the laminated films are stacked and stored at room temperature.

The difference between the softening point of the resin layer of the present invention and the softening point of the toner is preferably 5 ° C. or higher, more preferably 10 ° C.
The softening point of the resin layer is made lower than that of the toner by a difference of not less than 0 ° C, particularly preferably not less than 20 ° C. The reason for this is that when the softening point of the resin layer is lower than the softening point of the toner by 5 ° C. or more, the flexibility of selection such as the thickness of the resin layer and the pressurizing condition at the time of bonding is increased, and the light transmittance of the image is improved. This is because the resin layer can be efficiently formed.

The resin contained in the resin layer of the present invention has a softening point lower than that of the toner, is excellent in transparency, has good compatibility with the toner (adhesiveness), and has a refractive index of the toner. A resin substantially equal to the thermoplastic resin contained in is preferable. The reason for this is that when such a resin is formed on the toner image surface, the transparency of the image itself is not excluded,
This is because the light transmittance is improved. As such a resin, a thermoplastic epoxy resin is more preferable. More preferably, it is a thermoplastic epoxy resin having a number average molecular weight of 2000 or less. The reason for this is that the thermoplastic epoxy resin can have a predetermined softening point by adjusting the number average molecular weight. As such a thermoplastic epoxy resin, specifically, Shell Chemical Co. "Epikote 1001" (number average molecular weight about 900, softening point 64 ℃),
"Epicoat 1002" (number average molecular weight about 1060, softening point 78 ° C),
It is a bisphenol A type epoxy resin such as "Epicoat 1003" (number average molecular weight of about 1600, softening point of 89 ° C).

As used herein, the term "softening point" refers to
A temperature at which a certain load is applied to a thermoplastic resin or a thermoplastic toner to start deformation when heated. Specifically, it is measured by the method described in JIS K 7234-1986 called the "ring and ball method".

The thickness of the resin layer in the present invention is preferably 50% or more of the average particle diameter of the toner, more preferably 100% or more of the average particle diameter of the toner (the same thickness as the average particle diameter or more). is there. The reason for this is that if the thickness of the resin layer is less than 50% of the average particle size of the toner, the recesses on the image surface cannot be filled sufficiently, and the light transmittance is poorly improved.

On the other hand, the particle size of the toner used in the present invention is preferably in the range of 3 to 50 μm, more preferably 7 to 20 μm. The reason is that if the particle size of the toner is smaller than 3 μm, it becomes difficult to form an image on the transparent film substrate, and conversely, if it exceeds 50 μm, the resolution of the image decreases. Therefore, the thickness of the resin layer of the present invention is specifically selected depending on the particle diameter of the toner used, but is preferably 2 to 100 μm, more preferably 3.5 to 70 μm. The reason for this is that if it is thicker than 100 μm, the light transmittance of the light-transmitting image film is hindered and the sharpness of the projected image is lowered, and if it is less than 2 μm, the improvement of light transmittance is poor.

Further, the thickness of the resin layer when the laminate film of the present invention is used in a translucent image film using color toner (cyan, magenta or yellow) is preferably 10 to 50 μm, particularly preferably It is in the range of 20 to 40 μm. The reason for this is that if the thickness of the resin layer is less than 10 μm, the improvement of light transmission is poor. On the other hand, at the upper limit of the thickness, the light transmittance tends to drastically decrease in the range where the resin layer is thicker than 50 μm, particularly when the cyan color toner is used.

The resin layer in the present invention preferably contains an ultraviolet absorber. In recent years, in a translucent image film obtained by adhering a toner, the toner is made into fine particles in order to achieve high resolution and high light transmissivity of the translucent image. On the other hand, when this is a translucent color image, it also causes discoloration of the color image due to ultraviolet rays. By containing an ultraviolet absorber in the resin layer of the laminate film, prevention of fading of the color of the color image due to ultraviolet rays, that is, the color difference before and after irradiation with ultraviolet rays (ΔE)
Can be made smaller.

When the resin layer of the laminate film of the present invention contains an ultraviolet absorber, the amount is preferably 0.40 to 8.4 parts by weight based on 100 parts by weight of the resin of the resin layer. The reason for this is that if the ultraviolet absorber content is too small than the predetermined amount,
This is because the color difference before and after irradiation with ultraviolet rays can hardly be reduced, and conversely, even if the content of the ultraviolet absorber is more than a predetermined amount, the effect of reducing the color difference before and after irradiation with ultraviolet rays is reduced.

As the kind of the ultraviolet absorber used in the present invention, o-hydroxybenzophenone compounds are preferable. Such an ultraviolet absorber is preferable because it has good compatibility with the resin of the resin layer of the laminate film and can reduce the color difference before and after the irradiation of ultraviolet rays without lowering the transparency of the resin layer. In particular, such an ultraviolet absorber exhibits an effect when the resin layer of the laminate film contains a thermoplastic epoxy resin. In addition, such a resin layer containing an ultraviolet absorber is particularly preferable because it can significantly reduce the color difference before and after irradiation with ultraviolet rays in a translucent color image using magenta and yellow color toners. Specifically, as a type of the ultraviolet absorber, there is Uvinal (Uvial) manufactured by GAF.
nul) D50 "is particularly preferred.

A second embodiment of the present invention is shown in FIGS. 6 (a)-(c). That is, the toner is
In the method for forming the transparent resin layer 51 on the transparent image 62 obtained by attaching 63, (a) the resin layer 51 of the laminate film 54 of the present invention and the transparent image 62.
A step of bringing the image surface 64 of the above into contact with each other to form a laminated body 65;
(b) a step of laminating the laminated body at a softening point of the resin layer or higher, under a temperature condition of less than 150 ° C., and (c) a step of removing the cover film 53 from the obtained laminated body,
It is a method including.

The step of bringing the resin layer of the laminate film of (a) of the present invention into contact with the toner image surface of the light-transmitting image film and stacking them to form a laminated body enables the resin layer to be preferably adhered onto the toner image surface. This is a process for preparing. If this step is not performed properly, the resin layer peeled off from the laminate film cannot sufficiently fill the concave portion of the toner image. As a result, the light transmittance of the translucent image film cannot be improved.

In the step of laminating the laminate of (b) of the present invention under the temperature condition of the softening point of the resin layer or more and less than 150 ° C., the resin layer separated from the laminate film is preferably adhered on the toner image surface. This is a step for preferably forming a laminate layer in which the resin layer fills the concave portion of the toner image and the outer surface of which is smooth. If this process is not performed correctly, the light transmissivity of the translucent image film cannot be improved.

Further, it is important that the heating temperature is equal to or higher than the softening point of the resin layer. At a heating temperature below this, the resin layer is not sufficiently softened, and the resin layer peeled from the laminate film cannot sufficiently fill the concave portion of the toner image. The softening point of the resin layer is preferably 10 ° C. or higher, more preferably 20 ° C. or higher. Furthermore, heating at a temperature above the softening point of the resin layer by 30 ° C. or more and above the softening point of the toner is particularly preferable because a resin layer having a smooth outer surface can be formed on the image surface.

The upper limit of the heating temperature in the above step (b) must be lower than 150 ° C., preferably 140 ° C. or lower. The transparent film substrate of the translucent image film,
A transparent plastic film is used. The plastic film is easily deformed by heat in the range of 100-150 ℃. Especially when a PET film is used, it is preferable to avoid heating at 150 ° C. or higher. The reason for this is that when heated at 150 ° C. or higher in the above step (b), the transparent film base material curls due to thermal deformation, making it difficult to correctly focus on the entire surface of the image film when applied to an OHP projector. Because. When a PET film is used for the cover film of the laminate film, when heated at 150 ° C. or higher in the step (b), the cover film curls due to thermal deformation, and the heating roll is used during the step (b). May stick to.

Further, a transparent image film using a PET film as a transparent film substrate of the transparent image film, a cover film using a PET film, a release layer containing a polyvinyl butyral resin, and a softening point of 40. ~ 80 ° C
In the case of the combination of the laminate film having the resin layer containing the thermoplastic resin in the range of, the heating temperature in the step (b) is particularly preferably in the range of 110 to 130 ° C.

After the step (b) of the present invention, the cover film is removed from the laminate, but preferably the resin of the laminate layer is cooled and cooled to a temperature below the softening point before the cover film is removed. . When the release layer is a polyvinyl butyral resin, it is more preferable to leave the release layer on the resin layer adhered on the toner image surface.

A third aspect of the present invention is shown in FIG. 6 (c). That is, it is the translucent image supporting film 66 having the transparent resin layer 51 on the image surface 64 obtained by the above method. Preferably, the image is formed using color toner.

The color toner of the present invention is a toner containing a cyan, magenta or yellow colorant and a thermoplastic resin and having a softening point in the range of 80 to 150 ° C. Such a color toner is used to obtain a transparent chromatic image, unlike a black toner. Therefore, it is necessary to use the laminating method of the present invention in order to improve the light transmittance of the toner image.

The color toner of the present invention is preferably a dry toner. The dry toner is composed of a binder thermoplastic resin, a colorant, and other additives. Preferred thermoplastic resins for dry toners include styrene-acrylic acid copolymers, styrene-methacrylic acid copolymers, styrene-acrylate copolymers and bisphenol A type polyesters.

Further, when the resin layer of the translucent color image film of the present invention contains an ultraviolet absorber, it is particularly preferable because the color difference before and after the irradiation of the translucent color image with ultraviolet rays can be reduced.

The transparent film substrate of the translucent image film of the present invention is preferably a PET film excellent in transparency, heat resistance, strength and rigidity. Further, the thickness of this transparent film substrate is preferably in the range of 25 to 175 μm.
The reason for this is that if the thickness of the transparent film substrate is less than 25 μm, curling of the transparent film substrate is likely to occur in the heating step when laminating the resin layers, and if it is greater than 175 μm, the transparency of the translucent image film is increased. This is because there is a risk of damaging. Furthermore, when heating at a temperature of 130 ° C. or less, the thickness of the transparent film substrate is more preferably in the range of 25 to 100 μm. The reason for this is that in this thickness range, the translucent image film is not bulky when it is stored, and the curl of the transparent film substrate is unlikely to occur.

When the translucent color image film of the present invention is used in an OHP projector, it is particularly preferable because a sharp projected image can be obtained.

In the present invention, in order to form the release layer and the resin layer on the cover film in this order, a general method is used. An appropriate method may be selected depending on the material used. When a polyvinyl butyral resin is used for the release layer and a thermoplastic resin having a softening point in the range of 40 to 130 ° C. is used for the resin layer, it is preferable that the resin used together be applied as a solution. Specifically, each resin is dissolved in an organic solvent to prepare a solution, and the solution is applied onto the cover film using a Mayer bar. It is preferable to coat and dry the resin layer after coating and drying the release layer. The laminated film thus obtained exhibits more preferable effects in order to solve the above-mentioned problems.

The following other embodiments will be specifically described, but the present invention is not limited thereto. The resin layer 51, the release layer 52 and the cover film in the following embodiments
53 corresponds to the resin layer, the release layer and the cover film in the embodiment of the present invention shown in FIG.

[1] A resin layer having a thickness in the range of 2 to 100 μm and having a softening point lower than the softening point of the toner, 0.5 to 25 μm
A laminate film for forming a transparent resin layer on a light-transmitting image having a release layer having a thickness in the range of 1 and a cover film made of a plastic film.

[2] On a transparent image having a resin layer having a softening point lower than the softening point of the toner by 5 ° C. or more, a release layer having a thickness in the range of 0.5 to 25 μm, and a cover film made of a plastic film. A laminated film for forming a transparent resin layer on the surface.

[3] A resin layer containing a thermoplastic resin having a softening point of 40 to 130 ° C., a release layer having a thickness in the range of 0.5 to 25 μm,
And a laminate film for forming a transparent resin layer on a transparent image having a cover film made of a plastic film.

[4] A resin layer containing a bisphenol A type epoxy resin having a softening point lower than the softening point of the toner, 0.5
A laminate film for forming a transparent resin layer on a translucent image having a release layer having a thickness in the range of ˜25 μm and a cover film made of a plastic film.

[5] A resin layer containing an epoxy resin having a softening point lower than the softening point of the toner and having a molecular weight of 2000 or less;
A laminate film for forming a transparent resin layer on a translucent image having a release layer having a thickness in the range of 5 to 25 μm and a cover film made of a plastic film.

[6] A resin layer having a thickness in the range of 2 to 100 μm and having a softening point lower than the softening point of the toner and further containing an ultraviolet absorber, a release layer having a thickness in the range of 0.5 to 25 μm, And a laminate film for forming a transparent resin layer on a transparent image having a cover film made of a plastic film.

[7] A resin layer having a softening point lower than the softening point of the toner by 5 ° C. or more and further containing an ultraviolet absorber,
A laminate film for forming a transparent resin layer on a translucent image having a release layer having a thickness in the range of 5 to 25 μm and a cover film made of a plastic film.

[8] A resin layer containing a thermoplastic resin having a softening point of 40 to 130 ° C. and an ultraviolet absorber, a release layer having a thickness in the range of 0.5 to 25 μm, and a transparent film having a cover film made of a plastic film. A laminated film for forming a transparent resin layer on a photo image.

[9] A cover composed of a resin layer containing a bisphenol A type epoxy resin having a softening point lower than that of the toner and an ultraviolet absorber, a release layer having a thickness in the range of 0.5 to 25 μm, and a plastic film. A laminate film for forming a transparent resin layer on a translucent image having a film.

[10] From a resin layer containing an epoxy resin having a softening point lower than that of the toner and having a molecular weight of 2000 or less and an ultraviolet absorber, a release layer having a thickness in the range of 0.5 to 25 μm, and a plastic film. A laminated film for forming a transparent resin layer on a light-transmitting image having a cover film.

[0060]

The present invention will be described in more detail with reference to the following examples, which should not be construed as limiting the invention thereto.
All “parts” are based on weight.

The production of the light-transmitting image film was carried out by electrophotography using an electrophotographic apparatus "Minolta CF70" manufactured by Minolta. "PPC film 742 (PET film with a thickness of 100 μm)" manufactured by 3M as a transparent film substrate
Was used in all examples. As the toner, three color thermoplastic color toners (cyan, magenta and yellow) having a softening point of 94 to 96 ° C. were selected and used in each example.

Example 1 A laminated film was produced as follows. First,
Monsanto's "Butavar B72 (polyvinyl butyral resin)" to prepare a solution for the release layer consisting of 0.1 part and THF 1.9 parts, on a cover film made of polyethylene terephthalate (PET) having a thickness of 50 μm, # 40. It was applied and dried by using a Meyer bar. The thickness of the release layer after drying was 7 μm. Further, on the release layer, a solution for a resin layer consisting of 0.6 parts of "Epicoat 1001 (bisphenol A type epoxy resin having a number average molecular weight of 900 and a softening point of 64 ° C)" manufactured by Shell Chemical Co., Ltd. and 1.4 parts of THF Then, coating and drying were carried out in the same manner to produce a desired laminated film. The thickness of the resin layer was 25 μm.

The translucent image film has a transmission optical density.
A toner having an image using a cyan toner having a (TOD) of 0.68 was used.

The laminate layer was formed on the translucent image film as follows. First, the resin layer of the laminate film was brought into contact with the toner image surface of the translucent image film to form a laminate. Then, the heating temperature was 119 ° C, the roll pressure was 3 kg / cm ^2, and the passing speed was 9.5 / sec.
The laminate was pasted through between two rolls.
Finally, the cover film was peeled off from the laminate to form a release layer and a resin layer on the toner screen.

The transmitted visible light spectroscopic analysis of the translucent image film having the resin layer thus obtained was carried out using a Hitachi Model 330 spectrophotometer. The result is shown in FIG. In FIG. 1, the solid line is the measurement result of the transmitted visible light spectrum of the translucent image film having the resin layer of this example. Further, the chain line is the measurement result of the transmitted visible light spectrum obtained in the same manner as in this example for the transparent image film before forming the resin layer on the image surface. It can be seen that the translucent image film having the resin layer of this example has improved light transmissivity at all wavelengths as compared with that before lamination. Especially at a wavelength of 500 nm, the translucent image film having the resin layer of this example shows a light transmittance of 80%,
This was an improvement in light transmittance of 20% compared to before forming the resin layer.

Comparative Example 1 The resin layer was changed to "Epicoat 1001" manufactured by Shell Chemical Co., Ltd.
Shell Chemical Co., Ltd. "Epicoat 1009 (number average molecular weight 2400 to 3300, softening point 14 which has a softening point higher than the softening point of the toner
Except that the bisphenol A type epoxy resin at 4 ° C.) was used. The translucent image film of this comparative example showed a light transmissivity of only 65% at a wavelength of 500 nm, which was 15% lower than that of the translucent image film of Example 1.

Comparative Example 2 The resin layer of the laminate film was changed to "Epicoat 1001" manufactured by Shell Kagaku Co., Ltd., and "Byron 200 (softening point 1" was manufactured by Toyobo Co., Ltd., which has a softening point higher than that of the thermoplastic toner.
Example 1 except that a 63 ° C. polyester resin) was used.
And all went the same way. The translucent image film of this comparative example showed a light transmissivity of only 65% at a wavelength of 500 nm, which was 15% lower than that of the translucent image film of Example 1.

Example 2 Instead of a transparent image film of cyan toner, TOD
The same procedure as in Example 1 was carried out except that a translucent image film using a magenta toner of 0.59 was used. The results of the transmission visible light spectroscopic analysis of the obtained transparent image film having a resin layer are shown in FIG. In FIG. 2, the solid line is the transmitted visible light spectrum of the translucent image film having the resin layer of this example. The chain line is the transmitted visible light spectrum of the transparent image film before the resin layer is formed on the image surface. It can be seen that the translucent image film having the resin layer of the present example has improved light transmissivity at all wavelengths as compared with before the resin layer was formed. Especially 65
At a wavelength of 0 nm, the translucent image film having the laminate layer of this example exhibits a light transmittance of 79%, which is an improvement in light transmittance of 10% as compared with that before forming the resin layer. there were.

Example 3 Instead of a transparent image film of cyan toner, TOD
Was carried out in the same manner as in Example 1 except that a light-transmissive image film using a yellow toner of 0.38 was used. The result of the transmission visible light spectroscopic analysis of the obtained translucent image film having a resin layer is shown in FIG. In FIG. 3, the solid line is the transmitted visible light spectrum of the transparent image film having the resin layer of this example. Further, the chain line is the transmitted visible light spectrum of the translucent image film before forming the resin layer. It can be seen that the translucent image film having the resin layer of the present example has improved light transmissivity at all wavelengths as compared with before the resin layer was formed. Especially at a wavelength of 575 nm, the translucent image film having the resin layer of the present example shows 73% light transmittance, which is an improvement of 20% in light transmittance as compared with before forming the resin layer. Met.

Example 4 The thickness of the resin layer of the laminated film was changed from 25 μm to 3.5 μm.
A laminated film was produced in the same manner as in Example 1 except that the thickness was changed. Using the obtained laminate film, a resin layer was formed in the same manner as in Example 1 on a translucent image film using the same cyan toner, magenta toner and yellow toner as those described above. The light transmittance of the light-transmitting image film at a specific wavelength was measured in the same manner as in Example 1. That is, light at a wavelength of 500 nm for a transparent image film of cyan toner, 650 nm for a transparent image film of magenta toner, and 575 nm for a transparent image film of yellow toner. The permeability was measured. Then, the above operation was repeated in the same manner except that the thickness of the resin layer was changed from 3.5 μm to 13 μm, 40 μm and 90 μm, respectively. The results are shown in FIG. 4 (the results of Examples 1 to 3 were used as the measured values when the thickness was 25 μm).

As is clear from FIG. 4, the particle size of the thermoplastic toner (about 10 μm) is sufficient to obtain a sufficient improvement in light transmission.
It has been found that this is the case for a resin layer having a thickness of about 5 μm or more, preferably about 10 μm or more, which is 50% of (μm). Further, it was found that the effect of improving the light transmittance was particularly remarkable when the thickness of the resin layer was in the range of 20 to 40 μm, and the effect was not so great when the resin layer was too thick.

Example 5 The same procedure as in Example 1, Example 2 and Example 3 was carried out except that 0.005 parts of "Ubinal D50" manufactured by Gaff Co., Ltd. was used as an ultraviolet absorber in the resin layer of the laminate film. It was A light-transmitting image support film (cyan color, magenta color, and yellow color image) having three types of resin layers of this example and a light-transmitting image film before forming the corresponding three types of resin layers The color difference before and after irradiation with ultraviolet rays was evaluated as follows. First, all the transparent image-supporting films were processed with a Q-panel accelerated light resistance tester “QUV”
Exposed to UV for hours. Next, the color difference before and after exposure (Δ
E) was measured using a color difference meter “CR-121” manufactured by Minolta. The results are shown in Table 1.

[0073]

[Table 1] Toner image color difference (ΔE) Translucent image support film having resin layer before resin layer formation Translucent image support film Cyan 0.9 0.7 Magenta 1.9 0.2 Yellow 6.4 1.5

As is clear from Table 1, the translucent image film having the three types of resin layers of this example corresponds to the corresponding three.
Compared with translucent image film before forming resin layers of different types, the color difference (ΔE) before and after exposure to ultraviolet rays is small, fading resistance
It was found that the (light resistance) was improved. In particular, in the light-transmitting color image films of magenta color and yellow color, the light resistance improving effect was remarkable.

[0075]

INDUSTRIAL APPLICABILITY As described above, the light transmittance of the translucent image film is improved so that a clear projected image can be obtained, and the curl of the transparent film base material which is the support of the translucent image film can be obtained. It was possible to provide a laminate film for a translucent image film, which can suppress thermal deformation and can prevent sticking to a heating roll in the bonding step. In addition, it was possible to provide a laminating method suitable therefor and a translucent color image film having an excellent laminating layer obtained by the method.

[Brief description of drawings]

FIG. 1 is a graph showing a comparison of transmitted visible light spectra of a translucent image film having a resin layer according to the present invention of Example 1 and a translucent image film before forming a resin layer on an image surface. .

FIG. 2 is a graph showing a comparison of transmitted visible light spectra of a translucent image film having a resin layer according to the present invention of Example 2 and a translucent image film before forming a resin layer on an image surface. .

FIG. 3 is a graph showing a comparison of transmitted visible light spectra of a translucent image film having a resin layer according to the present invention of Example 3 and a translucent image film before forming a resin layer on an image surface. .

FIG. 4 is a graph showing the relationship between the thickness of the resin layer and the light transmittance in the translucent image film having the resin layer according to the present invention of Example 4.

FIG. 5 is a cross-sectional view showing one embodiment of the laminated film of the present invention.

FIG. 6 is a cross-sectional view illustrating one embodiment of the method of the present invention.

[Explanation of symbols]

 51 ... Resin layer, 52 ... Release layer, 53 ... Cover film, 54 ... Laminate film, 61 ... Transparent film substrate, 62 ... Translucent image, 63 ... Toner, 66 ... Translucent image supporting film.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshikazu Mizobuchi 3-8-8 Minamihashimoto, Sagamihara City, Kanagawa Sumitomo 3M Limited

Claims (7)

[Claims] 1. A laminate film for forming a transparent resin layer 51 on a transparent image 62 obtained by attaching a toner 63 on one main surface of a transparent film substrate 61.
54, a laminate film 54 in which the laminate film 54, a release layer 52, and a resin layer 51 are laminated in this order, and the softening point of the resin layer 51 is lower than the softening point of the toner 63. 2. The laminate film for forming a transparent resin layer on a translucent image according to claim 1, wherein the resin layer has a softening point in the range of 40 to 130 ° C. 3. The transparent resin layer on the translucent image according to claim 1, wherein the thickness of the resin layer is 50% or more of the average particle diameter of the toner. A translucent image laminating film for forming. 4. A laminate film for forming a transparent resin layer on a translucent image according to claim 1, wherein the resin layer further contains an ultraviolet absorber. . 5. A method for forming a transparent resin layer 51 on a light-transmissive image 62 obtained by depositing a toner 63 on one main surface of a transparent film substrate 61, comprising: (a) The step of bringing the resin layer 51 of the laminated film 54 and the image surface 64 of the translucent image 62 into contact with each other to form a laminated body 65, which comprises (b) the laminated body, A step of laminating under a temperature condition of the softening point of the resin layer or more and less than 150 ° C., and (c) the obtained laminated body 65 to the cover film 5
And a step of removing 3. 6. A translucent image-supporting film having a transparent resin layer on the image surface obtained by the method according to claim 5.
66. 7. The translucent image-supporting film according to claim 6, wherein an image is formed by using a color toner.