JP2003140376A - Laminate film for covering image and image projecting sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate film for covering image which can be subjected to hand laminate treatment, is excellent in positioning property, sliding property and air flowing out property and can improve the image quality of a projected image when laminated on a transparent film for OHP. SOLUTION: The laminate film for covering image carried by a supporting body has a transparent base material and a transparent adhesive agent layer applied onto one surface of the base material and the adhesive agent layer is made of a pressure sensitive adhesive and further its surface has a fine rugged structure.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to laminated films and more particularly to laminated films useful for coating an image carried on a support.
The present invention can be advantageously used particularly for coating a toner image carried on a transparent sheet for image projection. The laminate film of the present invention can be hand-laminated at room temperature without requiring a special laminating device or skill when laminating and laminating the image holding surface of a transparent sheet. Actually, the hand laminating process can be sufficiently performed with a small rubber roller. In addition, the laminated film of the present invention does not trap and enter air as air bubbles during the laminating process, and in some cases, even if air bubbles enter, it can be easily pushed out to the outside. Good (slidability) and easy positioning and sticking work. The laminated film of the present invention is also capable of embedding the uneven portion derived from the toner image on the surface of the transparent sheet with the adhesive layer to flatten the image layer and reduce light scattering with respect to transmitted light. The image quality of can be improved. The present invention further relates to an image projection sheet provided with such a laminated film. A typical image projection sheet is a laminated transparency sheet for overhead projectors (OHP).

[0002]

2. Description of the Related Art As is well known, various types of transparency sheets for image projection have already been proposed. A transparency sheet for image projection usually has a transparent plastic film as a support, and a monochrome or color image formed by fusing toner is imagewise carried on one surface thereof. ing. The toner is usually composed of a binder resin such as polyester resin, a colorant (dye or pigment), a charge control agent, and the like. Using such toner, a toner image is generally formed by an electrophotographic method.

Conventionally, there have been some problems in forming a transparency sheet by forming a color image on an OHP transparent film with a color copying machine or printer adopting an electrophotographic system. One problem is that the melting of the color toner on the transparent film is insufficient, and uneven portions remain in the toner image layer. If the toner image layer has an uneven portion, it is not possible to avoid the occurrence of light scattering with respect to transmitted light, and at the stage of actually using the transparency sheet in OHP, the image quality of the projected color image is It causes a significant reduction.

As one method for preventing the generation of undesired light scattering on the surface of the toner image layer, a method of covering the toner image layer of the transparency sheet with a transparent film is known. That is, it has been proposed that by covering the toner image layer with a transparent film, the uneven adhesive of the toner image layer is filled with the transparent adhesive of the film to flatten it, thereby reducing light scattering with respect to transmitted light.

To explain in more detail, for example, Japanese Patent Laid-Open No. Hei 2
JP-A-38090, after forming a toner image on a transparent film, a cover sheet comprising a film and / or paper / release agent layer / thermoplastic transparent resin layer is provided on the toner image surface for the cover. Disclosed is an image coating method characterized in that the thermoplastic transparent resin layer surfaces of the sheets are superposed, heated and pressed by a roller or a plate, and after the thermoplastic transparent resin has cooled, the film and / or the paper is peeled off.

However, in the above-mentioned image coating method and other film coating methods, when the sheet or film for the cover is manually overlapped on the color image surface of the transparent film for OHP to carry out so-called hand laminating treatment, A new problem is that air is entrapped between the cover sheets or films and remains as bubbles. Once such air bubbles are taken in, they cannot be removed even by using a jig such as a squeegee. When air bubbles remain on the color image surface of the transparency sheet, not only the adhesive performance is deteriorated, but also the shadow of the air bubbles is reproduced as an image defect in the projected image, and the image quality of the projected image is significantly deteriorated.

Further, the hand laminating process of the cover sheet or film for the OHP transparent film requires a high degree of skill. In the conventional hand laminating process, when the cover sheet or film is attached to the OHP transparent film, the adhesive layer has a strong adhesive force, so that it is impossible to perform sufficient positioning work and the position is incorrect. It was often accidentally pasted on. Further, it is often very difficult to perform the re-pasting work after the wrong pasting work, and the image surface of the transparent film is often damaged.
Therefore, it is desired to provide a cover sheet or film for OHP transparent film, in which the positioning work can be performed easily and accurately, and the re-sticking work can be easily performed even after the wrong sticking work. ing.

Referring again to the image coating method described in JP-A-2-38090, in this method, heating and pressurizing treatment must be carried out by using a specific means during the laminating treatment. Becomes complicated, the manufacturing cost increases, and further, the problem that the transparent film and the cover sheet are thermally deformed during heating occurs.

Further, the conventional transparency sheet for OHP has a problem that it is not easy to store and file. For example, when binding and storing the created transparency sheets in a binder, etc., make holes at the ends of the transparency sheets, or store each transparency sheet in a dedicated perforated holder and then use the binder, etc. It was necessary to lock in.

[0010]

SUMMARY OF THE INVENTION The object of the present invention is to solve the problems of the prior art as described above, and to carry out hand laminating at room temperature when laminating and pasting on a transparent film for OHP. In addition, the sticking workability, particularly the alignability, the slidability, and the air bleeding property are all good, and the sticking work can be performed again as necessary.
Another object of the present invention is to provide an image-coating laminated film capable of improving the image quality of a projected image when laminated on an OHP transparent film.

Another object of the present invention is to provide an image-coating laminate film capable of improving the preservability and filing property of a transparency sheet for OHP and the like.

It is a further object of the present invention to provide an image projection sheet with such an improved laminate film.

These and other objects of the invention are
It will be readily understood from the detailed description below.

[0014]

According to the present invention, in one aspect thereof, an image carried by a support (hereinafter, also referred to as "image-bearing support" or "adherend") is coated. Which is a laminated film having a transparent base material and a transparent adhesive layer applied to one surface of the base material,
The pressure-sensitive adhesive layer is composed of a pressure-sensitive adhesive and has a fine uneven structure on the surface thereof.

The present invention also provides, in another aspect thereof, an image projection sheet comprising a transparent support and a toner image carried on the surface of the support, wherein the image of the support is provided. The holding surface is covered with a laminate film having a transparent base material and a transparent pressure-sensitive adhesive layer applied to one surface of the base material via the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer is An image projection sheet characterized by comprising an adhesive and having a fine uneven structure on the surface thereof.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a laminate film for image coating and an image projection sheet according to the present invention will be described with reference to the accompanying drawings.

The laminate film of the present invention is usually for coating an image carried by a support, and comprises a transparent base material and a transparent adhesive layer provided on one side of the base material. In addition, the transparent pressure-sensitive adhesive layer is not particularly limited as long as it satisfies the requirements described above and described in detail below.

The laminated film of the present invention can exhibit its effect well, particularly when the image on the support is a monochrome or color image formed by fusing of toner, and also exhibits light scattering. Considering that prevention is possible, it is particularly suitable for coating a color toner image. The method for forming a toner image is not particularly limited, and includes, for example, a method based on an electrophotographic method (electrophotography, electrography, ionography, etc.) that is widely used as an image forming technique. Since each image forming method is described in detail in the patent document or the textbook,
The repeated description here is omitted. The laminate film of the present invention can be used particularly advantageously for coating OHP transparency sheets, as will be described below, but may be used to improve image quality of other toner imaged elements and photographic prints, if desired. And may be used for protection.

FIG. 1 is a sectional view showing a preferred example of a laminated film for image coating according to the present invention. The laminate film 10 is attached to a transparent base material 1 and an image bearing support provided on one surface of the base material 1 and being an adherend, for example, an image holding surface of a transparent film for OHP (not shown). And a possible transparent pressure-sensitive adhesive layer 2. The surface of the pressure-sensitive adhesive layer 2 is provided with a fine uneven structure as described below. The pressure-sensitive adhesive layer 2 is usually
The laminated film is covered with a release liner 3 to protect it until it is used. On the surface of the release liner 3, in order to impart a fine concavo-convex structure to the surface of the pressure-sensitive adhesive layer 2 of the laminate film 10, preferably a combination of protrusions and communication grooves, recesses and continuous microscopic portions are formed at the positions corresponding thereto. It is preferable that a protrusion is provided. Although not shown here, the laminate film 10 may have an additional layer, if necessary.

In the laminate film of the present invention, the pressure-sensitive adhesive layer plays a particularly conventional role. It is preferable that the pressure-sensitive adhesive layer is made of a pressure sensitive adhesive and does not have removability. By using such a pressure sensitive adhesive, strong adhesion of the laminate film to the adherend can be achieved.

Further, the fine uneven structure on the surface of the pressure-sensitive adhesive layer has a function of discharging the air trapped between the two when the laminate film is attached to the image holding surface of the image bearing support, In addition, it is preferable that the uneven structure itself has a shape and dimensions that can be taken into the pressure-sensitive adhesive layer and disappear when the application is completed. A suitable concavo-convex structure is usually composed of a group of protrusions that are regularly or randomly distributed, and a communicating groove formed between the protrusions.

On the surface of the pressure-sensitive adhesive layer, the projections and the communication grooves can be combined in various ways to form an uneven structure. That is, these two elements use protrusions of various shapes and sizes and arrange them in a regular pattern in order to maximize their effect and optimally control them. Alternatively, they may be arranged in a random pattern. For example,
The protrusions can have the shape of a regular quadrangular pyramid, a triangular pyramid, a cone, a truncated quadrangular pyramid, a truncated cone, a hemisphere, a sphere, and in some cases, any combination of these protrusions. . In the group of these protrusions, the boundary portion between adjacent protrusions is usually lower than the other portions of the protrusions, so that the communicating groove in the present invention can be formed.

2 and 3 are a cross-sectional view and a plan view, respectively, showing a preferred example of the fine concavo-convex structure in the laminate film of the present invention. Fine uneven structure 12
As shown in the drawing, regular pyramidal protrusions 26 are arranged at equal intervals on the surface of the pressure-sensitive adhesive layer 2 coated on the surface of the transparent base material 1, and the distance between the protrusions 26 is V. The V-shaped communication grooves 24 are configured to run in a grid pattern. As a result of arranging the protrusions 26 and the communication grooves 24 in such a pattern, it is possible to improve the air releasing property and the slidability at the same time, and the dense arrangement of the protrusions improves the attachment workability and the light transmission. It is effective in preventing the deterioration of sex. further,
Since such a laminated film has excellent air-releasing properties, it can be laminated at room temperature without requiring special laminating equipment or skill.

The same applies to other laminated films of the present invention, but in the laminated film shown in FIGS. 2 and 3, the group of projections 26 on the surface of the adhesive layer 2 is 400 μm. It is preferable that they are provided at the following pitch p (the average value of the center-to-center distances between adjacent protrusions 26). When the pitch p between the protrusions exceeds 400 μm, the pattern of the protrusions appears on the surface of the laminated film after being attached, which causes deterioration of the image quality of the projected image. Further, regarding the size of each protrusion, the height h of the protrusion 26 from the bottom surface of the communication groove 24 is h.
Is preferably in the range of 3 to 30 μm. If the height h of the protrusion 26 is less than 3 μm, the air bleeding property is not exhibited, and if it exceeds 30 μm, the quality of the projected image is deteriorated. Further, the length of the top side of the communication groove 24 is 1
It is preferable that the range is from μm to the size of the pitch p defined in each case. If the length is less than 1 μm, the air bleeding property will not be exhibited. Due to the structure of the communication groove, the length of the top side thereof does not become longer than the pitch.

In the laminate film for image coating of the present invention, the surface of the pressure-sensitive adhesive layer preferably further comprises fine particles, and the fine particles preferably have no tackiness. The presence of such fine particles can contribute to further improvement of the alignment property and the slidability during the laminating process, as described in detail below.

4 and 5 are a cross-sectional view and a plan view showing an example in which the fine particles 4 are embedded in the surface of the pressure-sensitive adhesive layer 2 of the laminate film described above with reference to FIGS. 2 and 3, respectively. Is. The fine concavo-convex structure 12 is, as shown,
The fine particles 4 made of glass beads are provided on the inclined surface of the regular pyramidal protrusion 26. Each fine particle 4 is
It is fixed with cellulose resin. In the illustrated example, one fine particle 4 is embedded in each protrusion 26, but the number of fine particles 4 may be two or more if necessary. Further, if necessary, the fine particles 4 may not be embedded in some of the protrusions 26. Further, although the fine particles 4 are cylindrical in the figure,
It can have the same or different shapes and dimensions.

In the laminated film shown in FIGS. 4 and 5, the group of protrusions 26 distributed on the surface of the pressure-sensitive adhesive layer 2 has a pitch p of 400 μm or less as described above.
₁ (average value of the center-to-center distance between adjacent protrusions 26) is preferably provided. Further, the height h ₁ of each protrusion 26 from the bottom surface of the communication groove 24 is 3 to 30.
It is preferably in the range of μm. Furthermore, the protrusion 26
The microparticles 4 to be embedded in are usually a diameter d of about 1 to 100 μm, a pitch p _{2 of} 400 μm or less (an average value of distances between adjacent microparticles 4), and a height h of about 5 to 50 μm. ₂ (height from the bottom surface of the communication groove 24 of each fine particle 4) is preferable.

FIGS. 6 and 7 are a sectional view and a plan view, respectively, showing another preferable example of the fine concavo-convex structure in the laminate film of the present invention. As shown in the figure, the fine concavo-convex structure 12 has truncated quadrangular pyramid (or trapezoidal) protrusions 36 arranged at equal intervals on the surface of the adhesive layer 2 coated on the surface of the transparent substrate 1. In addition, the inverted trapezoidal communication grooves 34 run in a grid pattern between the protrusions 36. As a result of arranging the protrusions 36 and the communication grooves 34 in such a pattern, it is possible to improve the air releasing property and the slidability at the same time as in the above-mentioned example, and to attach the protrusions due to the dense arrangement of the protrusions. It is effective in improving workability and preventing deterioration of light transmission.

In the laminated film of FIGS. 6 and 7, the concavo-convex structure can have the following dimensions, for example, as described with reference to FIG.

Pitch p: 400 μm or less Height h: 3 to 30 μm From the width d ₁ : 0 μm of the bottom surface of the communicating groove, the base angle α is ₁ to 90.
The protrusions can be variously changed in order to form the fine concavo-convex structure from the width d ₂ of the upper surface of the communication groove: 1 μm to the size of the pitch p to a size large enough to have the above-mentioned degree. FIG. 9 schematically shows three examples of another protrusion that can be used for implementing the present invention. The protrusion shown in the drawing is particularly referred to as a double mechanism structure in the present invention, and by using the two structures in a stacked manner, the initial contact surface of the adhesive is further reduced, and the positioning property given to the laminate film is provided. Can be further strengthened. FIG. 9A shows a truncated square pyramid 42 with an exposed surface 43. A second square pyramid 44 having a base 45 is disposed on the exposed surface 43. Further, FIG. 9B shows another embodiment showing the double mechanism of the present invention. Rectangular mechanism 4
6 provides a base surface 47 for receiving a base 49 of a second, smaller rectangular mechanism 48. Generally, the basal surface of the second structure is smaller than the exposed surface of the first feature.
Further, different arrangements or shapes may be combined with the base structure to achieve the desired positioning characteristics for the present invention. Further, FIG. 9 (C) is similar to FIG. 9 (A).
It is a modification of the double mechanism part structure. As shown, the protrusion comprises a truncated square pyramid 42 having an exposed surface 43 and a quadrangular pyramid 41 having a base 45 exposed to the exposed surface 4.
Prepared on top of 3.

To further explain, in the laminate film provided with the protrusions shown in FIG. 9C, the concavo-convex structure can have the following dimensions, for example, with reference to FIG.

Pitch p: 400 μm or less Height h: 3 to 30 μm Height h ₁ : _{1 to} 25 μm Height h ₂ : 1 to 20 μm From the width d ₁ : 0 μm of the bottom surface of the communicating groove, the base angle α ₁ to 1 9
From the width d ₂ : 0 μm of the upper surface of the communication groove to a size large enough to make 0 degrees, the bottom angle α ₁ is
0 degrees, and the base _d 3 of the base angle alpha ₂ to a sufficient size to 1 to 90 ° quadrangular pyramid 41: from 0 .mu.m, the base angle alpha ₂ 1 to 9
The image covering laminate film of the present invention may be used as it is up to a size of 0 degree, but if the aim is also to improve the preservability and filing property, from one side thereof It is preferable that the strip is formed so as to project.
The attachment of the strip can be performed using various methods, but in particular, the end of the transparent base material forming the laminate film is made to protrude from one side of the laminate film by a predetermined length. It is preferable that the strip is formed by using a laminate film, or the strip is prepared separately from the laminate film and the strip is attached to one side of the laminate film at an arbitrary stage.

FIGS. 11 and 12 show a preferred example of the laminated film with such a strip. Since the illustrated laminated film 10 is based on the laminated film described above with reference to FIG. 1, it has a transparent substrate 1, a pressure-sensitive adhesive layer 2 and a release liner 3 sequentially formed thereon. ing. The base material 1 is
As shown in the drawing, the end portion of one side of the strip 5 projects by a predetermined length to form a strip 5, and a small hole 6 is provided at a predetermined position of the strip 5. The small holes 6 can be advantageously used for filing the laminate film 10 or an image projection sheet produced by using the laminated film 10 on a binder or the like, and thus,
Any number and size can be provided depending on the use of the laminated film and the like. Of course, if needed,
The strip 5 may be formed without holes.

As described above, the laminated film of the present invention has various configurations and characteristics within the scope of the present invention. Subsequently, the laminated film of the present invention will be described in more detail with respect to its constitution, characteristics and the like.

The transparent substrate can be constructed from a variety of plastic materials commonly used in the art. Examples of suitable substrates include, but are not limited to, those listed below, polyester resins, polystyrene resins, polycarbonate resins, vinyl resins,
Examples thereof include polyvinyl chloride resin, plasticized polyvinyl chloride resin, polyurethane resin, polyethylene resin, polypropylene resin and fluororesin. The thickness of these base materials can be widely varied depending on the desired application, etc., but is usually about 300 μm or less, preferably in the range of about 25 to 100 μm.

A particularly suitable plastic substrate for the practice of the present invention is polyethylene terephthalate (PET).
This resin is excellent in transparency, strength, and rigidity.

Further, the base material may be subjected to a primer treatment, if necessary, in order to strengthen the bonding force between the base material and the adhesive layer on the base material.

Further, in the laminated film of the present invention, printing may be performed on the surface of the base material opposite to the pressure-sensitive adhesive layer. This is because a more specific projection effect can be obtained by projecting a pattern (for example, a background) derived from such printing or the like together with the image projection. Generally, after forming an ink layer and performing desired printing, the surface is covered with a clear layer. Both the ink layer and the clear layer can be formed using techniques commonly used in the manufacture of marking films and the like.

In the laminate film of the present invention, the pressure-sensitive adhesive layer provided on the above-mentioned substrate is not particularly limited as long as it can ensure a predetermined level of transparency. A pressure sensitive adhesive is preferably used. Also,
It is preferable that the pressure-sensitive adhesive does not have removability. The pressure-sensitive adhesive useful for forming the pressure-sensitive adhesive layer is not limited to those listed below, but examples thereof include polyacrylate, tackifying rubber, tackifying synthetic rubber, ethylene vinyl acetate, and silicone. And so on. Acrylic adhesives suitable for the practice of the present invention include, for example, US Pat. No. 3,239,478, US Pat. No. 5,169,727, and Reissued Patent No. 2
No. 4,906, US Pat. No. 4,952,650 and US Pat. No. 4,181,752. A preferred class of pressure sensitive adhesives are homopolymers and copolymers of alkyl acrylates, or their multi-component copolymers.

Such an adhesive may be, for example, a polymer that is applied to a release liner after being dispersed in a solvent or water and then dried, and may optionally be further crosslinked. . If a solvent-based or water-based pressure sensitive adhesive composition is used, the adhesive layer will be accompanied by a drying step to remove all or most of the solvent or water. The adhesive may be a hot melt adhesive. Further, a low molecular weight polymerizable adhesive composition can be applied on a release liner and polymerized or crosslinked by heating, UV irradiation, electron beam irradiation or the like.

The adhesive may optionally contain one or more additives. Polymerization method, coating method, depending on the final use, etc., an initiator, a cross-linking agent, a plasticizer,
Tackifiers, chain transfer agents, antioxidants, stabilizers, flame retardants, viscosity enhancers and mixtures thereof can be used as additives.

The thickness of the adhesive layer is, for example, the composition of the adhesive,
It can be changed within a wide range according to many factors including the shape and size of the protrusion or the communicating groove, the type of adherend, and the thickness of the base material. Generally, the thickness of the adhesive layer is from about 10
It is preferably in the range of about 100 μm.

As described above, a plurality of protrusions are distributed on the surface of the pressure-sensitive adhesive layer in order to form a fine concavo-convex structure. Furthermore, if necessary, the protrusions may have a surface. At least one microparticle is provided. The form of the protrusion is not particularly limited. Since the presence of fine particles is arbitrary, the protrusions may not have fine particles, or only some of the protrusions may have fine particles. As the fine particles, those having no tackiness are preferable.

The fine particles, which are provided on the surface of the protrusions as necessary, constitute the slidable film on the adherend such as the OHP transparent film, if they can realize good slidability. The material and form are not particularly limited. However, it is preferable that the fine particles have a substantially spherical shape or a shape close thereto in order to obtain good slidability. Glass beads are particularly useful in the practice of the present invention because they can be economically manufactured to substantially uniform dimensions. Other useful microparticles are ceramic particles, metal particles, polymer particles and the like. If necessary, conductive particles or adhesive microspheres may be used.

The size of these fine particles can be changed within a wide range. However, the size of fine particles is
In order to avoid deterioration of the slidability, damage to the substrate, and deterioration of the light transmittance of the resulting laminate film, it is preferable that the thickness of the pressure-sensitive adhesive layer on which it is disposed does not exceed the thickness. The size of the fine particles, when expressed in terms of average diameter, is usually in the range of about 1 to 100 μm. Further, when the thickness of the adhesive layer is about 25 μm, it is generally about 2
It is preferably less than 0 μm (average diameter), and more preferably in the range of about 5 to 15 μm.

In the pressure-sensitive adhesive layer of the laminate film of the present invention, in addition to the above-mentioned projections, fine communication grooves are formed between the respective projections and are terminated at the peripheral edge of the pressure-sensitive adhesive layer. . The communication groove is very fine and usually
It is virtually impossible to recognize its presence with the naked eye. That is, since the communicating groove cannot be clearly recognized by visual observation from any surface, it has a degree of fineness that requires microscopic observation. Here, "microscopic fineness" means a structure that is so small that an optical assist device is necessary for the naked eye to check the shape of the communication groove, no matter what the visual surface. Pointing to. One standard is the W.I. J. Smith, McGr
A publication published by aw-Hill, Modern
104 to 10 of Optic Engineering
It is shown on page 5. According to it, the visual acuity is "defined and measured by the size of the visual angle of the smallest recognizable character". Normal visual acuity is considered to be when the smallest recognizable character forms an arc on the retina with elevation angles in the range of 5 minutes. This translates into a lateral distance of 0.36 mm (0.0145 inch) for this object at a typical viewing distance of 250 mm (10 inches).

Although the communicating groove formed in the pressure-sensitive adhesive layer is finely formed,
It has a function of discharging the air trapped between the two when it is attached to an adherend such as a transparent film for HP (so-called "air bleeding" process). At the time of completion, the communication groove itself disappears in the form of being taken in by the adhesive layer, and therefore the adverse effect on the light transmittance due to the existence of the communication groove can be removed.

The shape and size of the communication groove are not particularly limited as long as the above-described effects can be obtained. For example, although the communication groove can be variously changed depending on the processing method, it is preferable that the communication groove has a V-shaped, U-shaped, rectangular, or inverted trapezoidal cross section when viewed in the transverse direction. Further, the limit of the dimension of the communication groove can be explained by using the aspect ratio. The aspect ratio is defined as the ratio of the microscopic maximum dimension of the communicating groove parallel to the surface of the pressure-sensitive adhesive layer to the microscopic maximum dimension of the communicating groove perpendicular to the surface of the adhesive layer. The aspect ratio can be measured by determining the cross-sectional dimension of the groove at an angle perpendicular to the wall of the communicating groove. The limit of this aspect ratio varies depending on the type of the communicating groove, but is usually in the range of about 0.1 to 20, and preferably in the range of about 10 to 15.

The communicating groove can be generally formed on the surface of the pressure-sensitive adhesive layer in various patterns. The communication grooves may be randomly arranged or may have a regular pattern. The pattern of the communication groove includes a pattern mainly composed of straight lines and a pattern mainly composed of curved lines. By combining a plurality of groove patterns, one continuous communicating groove pattern may be formed on the surface of the pressure-sensitive adhesive layer.

Further, the communication groove is preferably formed by previously forming continuous fine protrusions on the surface of the release liner on the pressure-sensitive adhesive layer side and coating the fine protrusions with the pressure-sensitive adhesive layer. You can Therefore, the micro-projections of the release liner can have a shape that can be fitted into the communication groove, and specifically, a triangle, an inverted U shape, a rectangle,
It can have a trapezoidal or other cross-section.

In the laminated film of the present invention, the total thickness thereof (that is, the total thickness of the base material and the pressure-sensitive adhesive layer, and if the additional layer is included, the thickness of the layer is also added) Can be widely changed according to each laminate film, but usually about 5
It is preferably in the range of 0 to 300 μm.

In the laminated film of the present invention, the release liner for coating the pressure-sensitive adhesive layer on the substrate can be formed in various forms. However, the release liner has recesses and continuous microprojections on the surface thereof, and these recesses and microprojections respectively have shapes and shapes of projections and communicating grooves required in the adhesive layer of the intended laminate film. A form corresponding to the dimensions is preferable.

Although the release liner can be advantageously constructed from a variety of substrates, suitable substrates include paper and plastic materials such as polyethylene resins, polypropylene resins, polyester resins, cellulose acetate resins, polychlorinated resins. Vinyl resin, polyvinylidene fluoride resin, or the like, or paper or other material coated with or laminated with such a plastic material.
These embossable coated papers or thermoplastic films may be used as they are, but are preferably used after being treated with a silicone or other method to improve the peeling property. Also, the thickness of the release liner varies greatly depending on what kind of effect is required. The thickness of the release liner is usually
It is preferably in the range of about 30 to 300 μm. Further, any structure can be applied to the release liner using various techniques such as those disclosed in US Pat. No. 5,650,215.

Further, the formation of the depressions and the minute protrusions on the release liner can be performed by using various techniques including embossing. It is preferred to transfer the pattern to the surface of the release liner using a dedicated master tool utilizing the microriblocation technology developed by Applicant.

The laminated film according to the invention can be manufactured using various conventional techniques,
Basically, it can be advantageously manufactured by arbitrarily combining the following processing steps. (1) A step of forming a plurality of fine recesses in a predetermined pattern on the surface of the release liner to be brought into close contact with the pressure-sensitive adhesive layer of the laminate film. As an example, a useful release liner for use here is:
It is called a poly-coated liner and has a polyethylene coating on both sides of a paper substrate. Instead of the paper base material, a polyester base material or the like may be used. A silicone solution is applied to one of the polyethylene coatings of the release liner for release treatment. Next, a recess is formed in the polyethylene coating after the release treatment by embossing. The embossing can be performed, for example, by pressing an embossing roll called a master tool onto the polyethylene coating on one surface of the release liner. In addition to the embossing process using the master tool, the release liner may be provided with the recesses by other commonly used mechanical process or etching process. (2) Although optional, a step of filling each of the concave portions formed in step (1) with at least one fine particle.
As an example, the recesses formed in the above process are usually completely embedded in the recesses and filled with fine particles (here, clusters of glass beads are used) for improving slidability. . Preferably, in order to fill the glass beads, the slurry solution obtained by dispersing the glass beads in the cellulose resin is applied over the entire surface of the release liner. (3) When using fine particles, a step of scraping out extra fine particles other than those filled in the recesses with, for example, a doctor blade. Instead of the doctor blade, air blowing or the like may be used. (4) A step of imparting a microstructured surface composed of continuously formed microprojections to the surface of the release liner having recesses (which may be accompanied by the filling of microparticles in some cases). In one example, the polyethylene coating on the release liner is embossed again to form microprojections. Embossing can be performed in the same manner as above,
Other methods may be used in some cases. The surface pattern of the embossing roll is transferred to the polyethylene coating to obtain a release liner having fine protrusions. (5) A step of forming a pressure-sensitive adhesive layer by applying a pressure-sensitive adhesive to the microstructured surface of the release liner in a thickness sufficient to completely cover the microstructured surface. As an example, a pressure-sensitive adhesive of a selected thickness is applied on a polyethylene coating having microprojections of a release liner to a predetermined film thickness, dried, and further cured. The pressure-sensitive adhesive can be applied using a conventional coating method such as bar coating. (6) A step of laminating a base material of a laminate film on the pressure-sensitive adhesive layer of the release liner to complete the intended laminate film. As an example, after forming an adhesive layer on a release liner, a base material of a laminate film is laminated. Lamination of the base material can be performed using a conventional laminating method using a pressure roller or the like.

As described above, the order of these steps may be changed if necessary, and additional steps may be required depending on the desired laminated film structure. May be.

The laminate film for image coating of the present invention can be used in various technical fields by taking advantage of its excellent properties, but it can be particularly advantageously used for producing an image projection sheet. Particularly useful among the image projection sheets are OHP transparency sheets on which images are formed by fusing toner. That is, in the production of an image projection sheet, an image can be formed by an inkjet printing method or the like, but in the practice of the present invention, it is most advantageous to use a toner as a coloring material to form an image. The method for forming a toner image is not particularly limited, and a typical method is an electrophotographic method. More specifically, a transparency sheet for OHP having a toner image can be obtained by using, for example, a color laser beam printer (CLBP) which is widely available on the market.
It can be advantageously manufactured by fusing a color toner image to a dedicated transparent film.

FIG. 13 shows an OHP laminated transparency sheet as a preferred example of the image projection sheet according to the present invention. The laminated transparency sheet 20 has a toner image 15 on the surface of a transparent support (transparent film for OHP) 11, and one side of the support 11 including the toner image 15 has an adhesive layer 2 interposed therebetween. It is covered with the laminate film 10 of the present invention. As a result of covering the toner image 15 with the laminate film 10, the surface of the toner image 15 is flattened, and in this case, inconvenience such as air bubble entrapment does not occur.

In the image projection sheet of the present invention, the support carrying the toner image may be formed of any material as long as it is transparent and does not adversely affect the image projection. Considering light transmittance, handleability, cost, etc., it is advantageous to form the support from a plastic material. Suitable plastic materials include, but are not limited to those listed below, polyester resins, polypropylene resins, polyvinyl chloride resins, polyurethane resins, polystyrene resins, polycarbonate resins and the like. A typical example of such a support is the above-mentioned OHP transparent film.

In the production of the image projection sheet of the present invention,
It is necessary to position and laminate the laminate film of the present invention on an adherend after image formation such as a transparent film for P. Although this positioning operation was very difficult with the conventional laminated film, when the laminated film of the present invention was used, the microstructured surface of the film brought the adhesive into contact with the surface of the adherend. The laminate film can be moved relative to the surface of the adherend until pressure is applied to allow the adhesive to wet. With a suitable level of pressure and the resulting wetting, good adhesion is achieved between the adhesive and the adherend.

Further, by strongly pressing the laminate film against the adherend, the air trapped in the communication groove is caused to flow out to the periphery of the film, whereby the air bubbles can be removed. Furthermore, the fine communication grooves and protrusions of the laminate film of the present invention are substantially completely crushed after the film is attached to the adherend, and the fine particles are buried in the pressure-sensitive adhesive layer, The amount of adhesive that can come into contact with the body can be increased. As a result, it is ensured that the laminate film of the present invention has a desired level of adhesion to the adherend.

[0062]

EXAMPLES The present invention will be described below with reference to examples thereof. It should be understood that the present invention is not limited to the examples below. Example 1 In this example, an image-coating laminating film having an adhesive layer as described above with reference to FIGS. 2 and 3 was prepared and further used to refer to FIG. A laminated transparency sheet for OHP as described above was manufactured. A perforated strip for filing was also attached to this laminated transparency sheet.

As a transparent film for OHP, “CG3700” (product number), which is a film for a color laser printer commercially available from Sumitomo 3M Limited, was prepared. This transparent film was mounted on a color laser printer, "Color Laser Shot LBP-2040" (product number, manufactured by Canon), and color image printing was performed to produce a full-color transparency sheet.

Separately, a polyethylene terephthalate (PET) film, "Lumirror 50T" is used as a transparent film base material for producing a laminated film for image coating.
-60 "(trade name, manufactured by Toray) was prepared. Also, PET
As a release liner, a polycoat liner (commercially available from Rexam) in which a substrate made of polyethylene was subjected to polyethylene coating and silicone treatment was prepared. Then, using a master tool having a fine uneven structure having a shape and dimensions corresponding to the fine uneven structure of the adhesive layer of the target laminate film on the surface, one side of the release liner was embossed .
A release liner having fine irregularities on the surface corresponding to the fine relief structure of the master tool was obtained. The uneven structure of this release liner corresponds to the fine uneven structure (regular quadrangular pyramid structure) to be provided on the surface of the pressure-sensitive adhesive layer of the laminate film to be produced in this example, and the uneven structure opposite to that Met.

Further, 100 parts by weight of isooctyl acrylate (manufactured by 3M) and 0.04 parts by weight of 2,2-dimethoxy-1,2-diphenylethan-1-one, "Irgacure 651" (trade name, Ciba) (Specialty Chemicals Co., Ltd.) was mixed, and the resulting mixed solution was irradiated with ultraviolet rays in a nitrogen atmosphere to cause a partial photopolymerization reaction. The syrup thus obtained having a coatable viscosity was further mixed with 0.2 part by weight of 2,2-
Dimethoxy-1,2-diphenylethan-1-one and 0.2 parts by weight of 1,6-hexanediol diacrylate, "KS-HDDA" (trade name, manufactured by Nippon Kayaku) were added. The obtained syrup was applied in a thickness of 75 μm between one surface of the film substrate prepared in the previous step and the surface of the release liner having the concavo-convex structure, and irradiated with ultraviolet rays to complete the photopolymerization reaction. By curing the syrup, a laminated film with an adhesive layer having a structure as described above with reference to FIG. 1 was obtained. In the obtained laminated film, the surface of the pressure-sensitive adhesive layer had a regular pyramidal pyramidal concavo-convex structure. The size of the concavo-convex structure will be described with reference to FIG. 2. The pitch between the protrusions was p 197 μm, and the height of the protrusions from the bottom surface of the communication groove was h 13 μm. Further, the width 1 having a small hole for filing on one side of the film substrate of the obtained laminated film
A 6 mm storage strip (PET film) is a clear tape commercially available from Sumitomo 3M, "Sco
It was attached and fixed via "tch600" (trade name).

The laminate film with a strip produced as described above was peeled off from the release liner, and then was attached to the toner image holding surface of the previously prepared transparency sheet via the adhesive layer. A hand laminating process was adopted for sticking the laminate film, and it was lightly pressed by a rubber roller having a width of 47 mm and a diameter of 40 mm so that the laminate film was brought into close contact with the transparency sheet. OH having a cross-sectional structure as described above with reference to FIG.
A laminated transparency sheet for P was obtained. With this laminated transparency sheet, the air bleeding property was good, so defects such as air bubble mixing did not occur. Therefore, when actually projected with OHP, a clear and high-quality projected color image could be observed. . Also, this laminated transparency sheet could be easily filed into a binder by utilizing the perforated strip. [Evaluation of Image Quality of Color Image] In order to evaluate the image quality of a color image, a single color (yellow, magenta,
A laminated transparency sheet was prepared in the same manner as described above except that toner images of cyan, red, green and blue) were formed.

The Q factor of each laminated transparency sheet was measured using a haze meter, "TC-HIII" (trade name, manufactured by Tokyo Denshoku Co., Ltd.). Usually, the toner image on the transparency sheet causes a high level of light scattering, and such scattered light causes turbidity or cloudiness in the color of the projected image. Therefore, the Q factor is used to evaluate the image quality of the transparency sheet. Is particularly useful. The Q factor can very accurately measure the ratio of scattered light to transmitted light (light involved in the formation of a color image). The Q coefficient is defined by the following equation.

Q coefficient = {(light attenuation due to absorption) + (light attenuation due to scattering)} / (light attenuation due to absorption) In the above equation, the lower limit value of the Q coefficient is 1. That is,
In such cases, the light attenuation due to scattering is zero. Q
The smaller the coefficient, the better the transparency of the projected image.

Table 1 below summarizes the measurement results of the Q factor of the laminated transparency sheet. The “conventional product” shown in Table 1 for comparison is the conventional O
It is a transparency sheet in which a monochrome toner image is formed on a HP transparent film according to the same method as described above.

[0070]

[Table 1]

From the measurement results in Table 1 above, the laminated transparency sheet having the laminated film produced in this example attached to the image holding surface shows a small Q factor when a color image is projected from it, in other words, It can be seen that the light transmittance is high. Therefore, it was revealed that the laminate film of the present invention can provide a color image having excellent light transparency. Example 2 1. Preparation of Transparency Sheet The color laser printer film “CG3700” (product number) used in Example 1 was prepared as a transparent film for OHP. This transparent film is a color laser printer, "Color Laserjet 4500"
(Product number, manufactured by HP) and installed in a single color (red, green, blue, yellow,
Magenta and cyan) color image printing, total 6
A variety of transparency sheets were made.

Next, the light transmittance (%) of the transparency sheet with red, green, blue and yellow color images was measured in the wavelength range of 380 to 820 nm. A UV-Vis spectrophotometer # 62601 manufactured by SMMD Analytical Laboratory was used for the measurement of the light transmittance. As a result of the series of measurements, the measurement results as plotted in FIGS. 14 to 17 and summarized in Table 2 below were obtained. In each figure, CR is a transparency sheet for a red image, CG is a transparency sheet for a green image, CB is a transparency sheet for a blue image, and CY is a transparency sheet for a yellow image (C is a comparison). Means).

Further, the haze value (%) and diffuse reflectance (%, average value of wavelength 380 to 720 nm) of the transparency sheet with color images of red, green, blue and yellow were measured by BYK-Gardner TCS plus spectrophotometer. The measurement results shown in Table 3 below were obtained. 2. Preparation of Laminated Film An image-covering laminated film was prepared in the same manner as in Example 1. However, in this example, the polyethylene terephthalate (PET) film was changed to that manufactured by 3M Company, and the concavo-convex structure was provided as follows.

90 parts by weight of n-butyl acrylate (B
A, manufactured by Aldrich) and 10 parts by weight of 2-ethylhexyl acrylate (HEA, manufactured by Aldrich) are mixed, and the resulting mixed solution is irradiated with ultraviolet rays under a nitrogen atmosphere to partially perform a photopolymerization reaction. I let it. The thickness of the syrup obtained was 3 between one side of the film substrate prepared in the previous step and the surface having the concavo-convex structure of the release liner.
It was coated with a mill (76 μm) and irradiated with ultraviolet rays to complete the photopolymerization reaction. In the obtained laminated film, the surface of the pressure-sensitive adhesive layer had a regular pyramidal pyramidal concavo-convex structure. The size of the concavo-convex structure will be described with reference to FIG. 2. The pitch between the protrusions was p 197 μm, and the height of the protrusions from the bottom surface of the communication groove was h 13 μm. 3. Preparation of Laminated Transparency Sheet The laminate film prepared as described above was peeled off from the release liner, and then adhered to the toner image holding surface of the prepared transparency sheet via the adhesive layer. No force was applied to the laminate film at this point, then width 47 mm and diameter 4
A hand laminating process was performed using a 0 mm rubber roller. The rubber rollers were pressed lightly from left to right, from top to bottom, and from the center to the outside. OH where the laminating film adheres to the toner image surface
A laminated transparency sheet for P was obtained. With this laminated transparency sheet, the air bleeding property was good, so defects such as air bubble mixing did not occur. Therefore, when actually projected with OHP, a clear and high-quality projected color image could be observed. . 4. Measurement of light transmittance, haze value, and diffuse reflectance of laminated transparency sheet Light transmittance (%) of laminated transparency with color images of red, green, blue, and yellow prepared in the above item 3
Was measured in the wavelength range of 380 to 820 nm in the same manner as in the above item 1, and the measurement results plotted in FIGS. 14 to 17 and averaged in Table 2 below were obtained. In each figure, R is a red image laminated transparency sheet, G is a green image laminated transparency sheet, B is a blue image laminated transparency sheet, and Y is a yellow image laminated transparency sheet.

Furthermore, the haze value (%) and diffuse reflectance (%, average value of wavelength 380 to 720 nm) of the laminated transparency sheet with color images of red, green, blue and yellow were measured by BYK-Gardner TCS plus spectrophotometry. When measured with a meter, the measurement results as shown in Table 3 below were obtained.

[0076]

[Table 2]

[0077]

[Table 3]

From the measurement results shown in Tables 2 and 3 above, the laminated transparency sheet obtained by sticking the laminate film produced in this example on the image holding surface showed excellent and excellent light transmittance and haze. It is clear that it is possible to project a remarkably high-quality color image as compared with the conventional transparency sheet that does not have a laminate film, since it is possible to prevent the occurrence of diffuse reflection. 5. Evaluation of color image quality In order to evaluate the color image quality, a laminated transparency sheet with cyan, magenta and yellow color images prepared as described above and a laminate film prepared for comparison and covered with a laminate film were used. For the Q factor of the corresponding transparency sheet (conventional product) which is not provided, the haze meter, "TC-HII"
"I" (trade name, manufactured by Tokyo Denshoku Co., Ltd.).

Table 4 below shows the measurement results of the Q factor of each laminated transparency sheet together with the measurement results of the conventional products.

[0080]

[Table 4]

From the measurement results in Table 4 above, the laminated transparency sheet having the laminated film produced in this example attached to the image holding surface shows a small Q factor when a color image is projected from it, in other words, It can be seen that the light transmittance is high. Therefore, it was revealed that the laminate film of the present invention can provide a color image having excellent light transparency. Example 3 In this example, an image-coating laminate film having an adhesive layer as described above with reference to FIGS. 4 and 5 was prepared, and further used to prepare an image-coating laminate film. A laminated transparency sheet for OHP as described above was manufactured.

As in Example 1, the film for color laser printer, "CG3700" (product number), was manufactured by using the color laser printer, "Color Laser Shot LBP-".
No. 2040 ”(product number, manufactured by Canon Inc.) and color image printing was performed to produce a full-color transparency sheet.

Separately, in order to prepare a laminated film for image coating, a PET film was prepared in the same manner as in Example 1 above.
Prepared "Lumirror 50T-60" (trade name, manufactured by Toray), and released a polycoat liner (commercially available from Rexam) in which a base material made of PET is subjected to polyethylene coating and silicone treatment. Prepared as a liner. Then, one side of the release liner was embossed using a master tool having on its surface a fine projection group having a shape and dimensions corresponding to the projections of the adhesive layer of the target laminate film. A release liner having fine projections on the surface corresponding to the fine projections of the master tool was obtained.

Next, in the recess formed on the release liner, a cluster of glass beads having a diameter of about 5 to 30 μm (Nobel Industry in Sweden) was used.
s company (available as "Expancel"). In order to fill the glass beads, the glass beads were dispersed in a cellulose resin to prepare a slurry solution, and then the slurry solution was coated on one surface with a screen coater. Excess beads were scraped off with a doctor blade.

After that, a fine concavo-convex structure was formed again on the surface of the release liner by embossing. Embossing was carried out in the same way as the previous step. Further, the fine uneven structure formed here has a shape and dimensions corresponding to the fine uneven structure of the adhesive layer of the target laminate film.

Furthermore, 93.5 parts by weight of isooctyl acrylate (manufactured by 3M), 6.5 parts by weight of acrylic acid (manufactured by Wako Pure Chemical Industries) and 0.04 parts by weight of 2,2-dimethoxy-1, 2-Diphenylethan-1-one and "Irgacure 651" (trade name, manufactured by Ciba Specialty Chemicals Co., Ltd.) are mixed, and the resulting mixed solution is partially photopolymerized by irradiating with ultraviolet light under a nitrogen atmosphere. The reaction was allowed to take place. Further 0.2 parts by weight of 2,2-dimethoxy-1,2-diphenylethan-1-one were added to the syrup. The obtained syrup was applied in a thickness of 75 μm between one surface of the film substrate prepared in the previous step and the surface of the release liner having the concavo-convex structure, and irradiated with ultraviolet rays to complete the photopolymerization reaction. By curing the syrup, a laminated film with an adhesive layer having a structure as described above with reference to FIG. 1 was obtained. In the obtained laminated film, the surface of the pressure-sensitive adhesive layer had a regular pyramid-shaped concavo-convex structure and was filled with glass beads. The size of the concavo-convex structure will be described with reference to FIG. 4. Pitch of projections p ₁ 197 μm Height of projections from the bottom of the communication groove h ₁ 13 μm Pitch of glass beads p ₂ 300 μm The height h ₂ from the bottom surface of the communication groove was 20 μm.

After the release liner was peeled off from the laminate film produced as described above, it was attached to the toner image holding surface of the previously produced transparency sheet via the adhesive layer. A hand laminating process was adopted for sticking the laminate film, and it was lightly pressed by a rubber roller having a width of 47 mm and a diameter of 40 mm so that the laminate film was brought into close contact with the transparency sheet. The laminated transparency sheet for OHP having the cross-sectional structure described above with reference to FIG. 13 was obtained. With this laminated transparency sheet, the air bleeding property was good, so defects such as air bubble mixing did not occur. Therefore, when actually projected with OHP, a clear and high-quality projected color image could be observed. . [Evaluation of Image Quality of Color Image] In order to evaluate the image quality of a color image, a single color (yellow, magenta,
A laminated transparency sheet was prepared in the same manner as described above except that toner images of cyan, red, green and blue) were formed.

The Q factor of each laminated transparency sheet was measured by the same procedure as in Example 1 using a haze meter, "TC-HIII" (trade name, manufactured by Tokyo Denshoku Co., Ltd.).

Table 5 below summarizes the measurement results of the Q factor of the laminated transparency sheets. The “conventional product” shown in Table 5 for comparison is the conventional O
It is a transparency sheet in which a monochrome toner image is formed on a HP transparent film according to the same method as described above. Example 4 The procedure described in Example 3 above was repeated, but in this example,
The pressure-sensitive adhesive layer was formed as follows.

A mixed solution of 100 parts by weight of butyl acrylate (manufactured by Mitsubishi Chemical) and 0.04 parts by weight of 2,2-dimethoxy-1,2-diphenylethan-1-one (Irgacure 651, manufactured by Ciba Specialty Chemicals). UV irradiation under a nitrogen atmosphere to partially carry out a photopolymerization reaction,
A coatable syrup was created.

Further, 0.2 parts by weight of 2,2-dimethoxy-1,2-diphenylethan-1-one and 1,6-hexanediol diacrylate, "KS-HDDA" (trade name, manufactured by Nippon Kayaku Co., Ltd.) 0.1 part by weight was added to the syrup. Using this syrup, a laminated film was prepared in the same manner as in Example 3.

In the obtained OHP laminated transparency sheet, defects such as inclusion of air bubbles did not occur because the air bleeding property was good.
When projected with, a clear and high-quality projected color image was observed.

Subsequently, in order to evaluate the image quality of the color image, the method described in Example 3 was repeated to prepare a laminated transparency sheet. The h factor of the Q factor of each laminated transparency sheet,
When the measurement was performed using "TC-HIII" (trade name, manufactured by Tokyo Denshoku Co., Ltd.), the measurement results shown in Table 5 below were obtained.

[0094]

[Table 5]

From the measurement results shown in Table 5 above, the laminated transparency sheet having the laminated films prepared in Examples 3 and 4 attached to the image holding surface showed a small Q factor when a color image was projected therefrom. In other words, it can be seen that the light transmittance is high. Therefore, it was revealed that the laminate film of the present invention can provide a color image having excellent light transparency. Example 5 In this example, the same OHP laminated transparency sheet as in Example 3 was used, except that the image-coating laminate film including the adhesive layer as described above with reference to FIG. 8 was used. Manufactured.

The above-mentioned laminated film for image coating is
It was produced as follows.

First, isooctyl acrylate (3M
100 parts by weight and 2,2-dimethoxy-1,2-diphenylethan-1-one (Irgacure 651, Ciba.
(Specialty Chemicals) 0.04 parts by weight of a mixed solution was UV-irradiated in a nitrogen atmosphere to partially carry out a photopolymerization reaction to prepare a coatable syrup.

Further, 0.2 part by weight of 2,2-dimethoxy-1,2-diphenylethan-1-one and 0.25 part by weight of 1,6-hexanediol diacrylate (KS-HDDA, manufactured by Nippon Kayaku Co., Ltd.) Was added to the syrup. An adhesive layer was formed from this syrup according to the method described in Example 1 above. In this example, a syrup was applied between a PET liner as a transparent film substrate and a polyslick liner (commercially available from Inncoat) as a release liner. Then, when the pressure-sensitive adhesive layer is irradiated with UV to be photopolymerized, the pressure-sensitive adhesive layer has a fine structure on its surface, and according to the explanation given in FIG.
Pitch p: 197 μm, height h: 10 μm, width d ₁ : 3 μm of bottom surface of communication groove, width d ₂ : 15 μm of top surface of communication groove
Met.

After the release liner was peeled off, the laminate film was hand-laminated on the color image of the OHP transparent film. The obtained OHP laminated transparency sheet was free from defects due to residual air, and a high-quality projected color image was obtained.

When the Q factor of the obtained color image was measured, the measurement results shown in Table 6 below were obtained. Example 6 In this example, the same OHP laminated transparency sheet as in Example 3 was used except that the image-coating laminate film including the pressure-sensitive adhesive layer as described above with reference to FIG. 10 was used. Manufactured.

The above-mentioned laminated film for image coating is
It was produced as follows.

First, isooctyl acrylate (3M
100 parts by weight and 2,2-dimethoxy-1,2-diphenylethan-1-one (Irgacure 651, Ciba.
(Specialty Chemicals) 0.04 parts by weight of a mixed solution was UV-irradiated in a nitrogen atmosphere to partially carry out a photopolymerization reaction to prepare a coatable syrup.

Further, 0.2 part by weight of 2,2-dimethoxy-1,2-diphenylethan-1-one and 0.15 part by weight of 1,6-hexanediol diacrylate (KS-HDDA, manufactured by Nippon Kayaku Co., Ltd.) Was added to the syrup. An adhesive layer was formed from this syrup according to the method described in Example 1 above. In this example, a syrup was applied between a PET liner as a transparent film substrate and a polyslick liner (commercially available from Inncoat) as a release liner. Then, when the pressure-sensitive adhesive layer is irradiated with UV for photopolymerization, the pressure-sensitive adhesive layer has a fine structure on its surface, and according to the explanation made in FIG. 10, pitch p: 197 μm, height h ₁ : 15 μm. , Height h ₂ : 10 μm, width d ₁ : 3 μm at the bottom of the communication groove, width d ₂ : 20 μm at the top surface of the communication groove, and length d ₃ : 38 μm at the bottom of the double mechanism.

After the release liner was peeled off, the laminate film was hand-laminated on the color image of the OHP transparent film. The obtained OHP laminated transparency sheet was free from defects due to residual air, and a high-quality projected color image was obtained.

When the Q factor of the obtained color image was measured, the measurement results shown in Table 6 below were obtained.

[0106]

[Table 6]

From the measurement results in Table 6 above, it can be seen that the color images treated with the laminate films obtained in Examples 5 and 6 have a small Q coefficient (that is, high light transparency). Therefore, it was revealed that the laminate film of the present invention can provide a color image having excellent light transparency.

[0108]

As described above, when the laminated film of the present invention is used, air is not trapped as air bubbles under the pressure-sensitive adhesive layer when it is applied to an adherend, and in some cases Even if air bubbles enter, it can be easily pushed out in the process of sticking (that is, air bleeding is good), and the fine communication grooves of the adhesive layer used for discharging bubbles are Since it can disappear after the completion, it does not cause adverse effects such as light scattering.

Further, the laminated film of the present invention is
The slidability on the surface of the adherend is further improved by the function of the arranged fine particles, so that the positioning and sticking work can be carried out easily and accurately.

Therefore, according to the present invention, when laminated on an OHP transparent film or the like and attached, the toner image surface is flattened to reduce the light scattering with respect to the transmitted light and the image quality can be improved. Therefore, hand laminating can be performed at room temperature without the need for special laminating equipment or skill, and the sticking workability, especially the alignability, the slidability and the air bleeding property are all good. The re-pasting work can be performed accordingly.

Further, according to the present invention, it is possible to provide a laminate film for image coating which can improve the preservability and filing property such as a transparency sheet for OHP.

Further, according to the present invention, it is possible to provide an image projection sheet which is excellent in image quality of a projected image and is excellent in handleability and storability.

[Brief description of drawings]

FIG. 1 is a sectional view showing a preferred example of a laminated film for image coating according to the present invention.

FIG. 2 is a cross-sectional view showing a configuration of an adhesive layer of the laminated film shown in FIG.

FIG. 3 is a plan view showing the constitution of the pressure-sensitive adhesive layer shown in FIG.

FIG. 4 is a cross-sectional view showing a constitution of a pressure-sensitive adhesive layer in which fine particles of a laminate film according to the present invention are embedded.

5 is a plan view showing the configuration of the pressure-sensitive adhesive layer shown in FIG.

FIG. 6 is a cross-sectional view showing the constitution of the pressure-sensitive adhesive layer of the laminate film according to the present invention.

7 is a plan view showing the configuration of the pressure-sensitive adhesive layer shown in FIG.

FIG. 8 is a cross-sectional view showing dimensions of the pressure-sensitive adhesive layer shown in FIG.

FIG. 9 is a perspective view showing an example of a protrusion that can be applied to the laminate film of the present invention.

10 is a cross-sectional view showing the dimensions of the pressure-sensitive adhesive layer including the protrusion shown in FIG. 9 (C).

FIG. 11 is a sectional view showing a structure of a laminated film with a strip according to the present invention.

12 is a plan view showing the structure of a strip of the laminated film shown in FIG.

FIG. 13 is a sectional view showing a preferred example of the image projection sheet according to the present invention.

FIG. 14 is a graph showing a light transmission curve of a transparency sheet with a red image manufactured in Example 2.

FIG. 15 is a graph showing a light transmission curve of a transparency sheet with a green image produced in Example 2.

16 is a graph showing a light transmission curve of a transparency sheet with a blue image produced in Example 2. FIG.

17 is a graph showing a light transmission curve of a transparency sheet with a yellow image produced in Example 2. FIG.

[Explanation of symbols]

1 ... Base material 2 ... Adhesive layer 3 ... Release liner 4 ... fine particles 5 ... strip 6 ... small holes 10 ... Laminated film for image coating 11 ... Support 15 ... Image 20 ... OHP Multilayer Transparency Sheet 24 ... Communication groove 26 ... Protrusion

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Haruyuki Mikami             Sumitomo Three, 323 Tanato, Oyama-cho, Sunto-gun, Shizuoka Prefecture             Within M Corporation (72) Inventor Shigeaki Dokoshi             Sumitomo 3-8-8 Minami-Hashimoto, Sagamihara City, Kanagawa Prefecture             Within 3M Co., Ltd. F term (reference) 4F100 AK01A AK25B AK42A AT00A                       BA02 CB05B DD01B DE01B                       JL13B JN01A                 4J004 AA05 AA07 AA09 AA10 AA11                       AB01 CA03 CA04 CA05 CA06                       CC02 CC03 CC07 CD02 CE02                       CE03 DA04 DB02 DB05 EA06                       FA04 FA10                 4J040 HA346 JA09 JB09 KA03

Claims (13)

[Claims] 1. A laminate film for coating an image carried by a support, comprising a transparent base material and a transparent pressure-sensitive adhesive layer provided on one surface of the base material. A laminate film for image coating, wherein the pressure-sensitive adhesive layer is made of a pressure-sensitive adhesive and has a fine uneven structure on the surface thereof. 2. The uneven structure of the surface of the pressure-sensitive adhesive layer has a function of discharging air trapped between the laminate film and the image holding surface of the support to the outside when the laminate film is stuck to the image holding surface of the support, and the sticking is performed. The laminated film for image coating according to claim 1, wherein the uneven structure itself has a shape and dimensions that can be taken into and disappear in the pressure-sensitive adhesive layer when the process is completed. 3. The laminated film for image coating according to claim 1, further comprising fine particles having no tackiness on the surface of the pressure-sensitive adhesive layer. 4. The laminated film for image coating according to claim 3, wherein the fine particles are glass beads. 5. The laminated film for image coating according to claim 1, further comprising a release liner coated with the pressure-sensitive adhesive layer. 6. The laminated film for image coating according to claim 1, wherein the laminated film further has a strip protruding from one side thereof by a predetermined length. . 7. The laminated film for image coating according to claim 1, wherein the support is a transparent plastic film, and a toner image is fused on the surface thereof. . 8. An image projection sheet comprising a transparent support and a toner image carried on the surface of the support, wherein an image holding surface of the support has a transparent base material, and A laminate film having a transparent pressure-sensitive adhesive layer applied to one surface of the base material is covered via the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer is composed of a pressure-sensitive adhesive and has a fine surface. An image projection sheet having an uneven structure. 9. The uneven structure of the surface of the pressure-sensitive adhesive layer has a function of discharging air trapped between the laminate film and the image-holding surface of the support to the outside when the laminate film is stuck to the image-holding surface of the support. 9. The image projection sheet according to claim 8, wherein the uneven structure itself has a shape and dimensions capable of being taken into the pressure-sensitive adhesive layer and disappearing when completed. 10. The image projection sheet according to claim 8, further comprising fine particles having no adhesiveness on the surface of the pressure-sensitive adhesive layer. 11. The image projection sheet according to claim 10, wherein the fine particles are glass beads. 12. The image projection sheet according to claim 8, wherein the laminate film further has a strip protruding from one side thereof by a predetermined length. 13. The image projection sheet according to claim 8, which is used in an overhead projector.