JP3407248B2 - Film sheet having an ink-receiving layer capable of forming an image by a copying technique on one surface of a base film - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film sheet having an ink-receiving layer capable of forming a high-resolution / high-density image by a copying technique, and in particular, it is soft without a glare due to electrophotography. Relates to a film sheet capable of obtaining a color image with good resolution.

[0002]

2. Description of the Related Art Conventionally, it has been known to form a coating layer containing a white pigment or the like on the surface of a film in order to impart functions such as printability to the film sheet.
The film sheet on which the coating layer is formed is of such a degree that a practically usable image can be formed by using a conventional advanced printing method. In addition, the image created in this way is not sufficient for diffusing the light to be used for displaying POP, signboards, etc. unless it is attached to a glass surface equipped with a backlight. There is an inconvenience that the shape of the light source of the backlight looks thin on the display surface. Therefore, the conventional film sheet can almost satisfy the characteristics such as resolution and image density as a material for forming an image by a printing method for producing a large amount of printed matter, but it does not feel glaring due to an electrophotographic method. However, it was not sufficient as a film sheet capable of obtaining a color image with good resolution. In particular, it was not suitable as a film sheet for forming a display image using a backlight because of its poor light diffusion.

[0003]

Under such a technical situation of the film sheet for image formation, there is a case where only a small amount of image for display may be obtained in an extreme case. . In such a case, there is a demand for a film sheet capable of forming a high-quality image that can be used for display by a simple copying technique. For example, there is a case where a small amount of advertising billboards, POPs, illuminated billboards, etc., which are provided in aisles, etc., are desired immediately. In such a case, there is a demand for a film sheet that can immediately produce a necessary display image by using a technique such as a simple copying machine that is familiar to us. Also, a film sheet that can be used to make personalized daily life products such as dinner sheets and mouse pads with a so-called personalized differentiated image or pattern, especially with a color image or pattern, by a simple copying technique. Are desired. It is an object of the present invention to provide a particularly high-quality film sheet that can meet such social needs. In other words, there is provided a film sheet which is soft and does not have a glaring feeling, but can provide a color image with a good resolution, and particularly, a light diffusion property is excellent and an image capable of exhibiting a preferable display function can be obtained by a simple copying technique. This is the subject of the present invention.

[0004]

In order to solve the above-mentioned problems of the present invention, it is keenly understood how to modify the surface of a film sheet by a copying technique so as to form an image of the desired image quality. As a result of repeated investigations, urethane which is a sphere having an average particle size of 5 to 40 μm on the surface of the base film.
Solidify 15 to 35 wt% of resin beads by ionizing radiation
By using the ink blended in the ink base blended with the component, the thickness of 5μ ~ 1 by the printing method, especially the screen printing method.
It was found that the above problems can be achieved by forming a layer of 00μ. Further, by using a urethane resin as the spherical beads in such a study, even after forming a desired image on the ink receiving layer by a copying technique such as electrophotography, the surface of the film sheet is It has been found that a film sheet can be obtained which has a surface that moves well and has abrasion resistance characteristics, and which can form a color image with good reproducibility by a copying technique. It was also found that by providing the above-mentioned receiving layer, the light scattering property (diffusion property) was increased, the shape of the backlight was not visible, and a higher quality display image could be obtained. Although there was no difference in shape, it was surprising that the effect of improving optical characteristics such as light scattering was observed when urethane resin beads were used.

Further, by using a printing ink in which a component which is solidified by ionizing radiation is added to the base of the ink in which the urethane resin beads and the like are blended, a film sheet having further improved abrasion resistance is obtained, and the film is desired. If the product is cut into the shape of the product, for example, the size of the mouse pad, the purchaser of the product can obtain the mouse pad with a desired image or pattern by copying means. In particular, when using it as a mouse pad, peel off the mouse pad on the surface of a desk or the like by a printing method using an ink made of a soft and flexible material on the surface not coated with the ink receiving layer. The function as a mouse pad can be obtained by forming a sucker layer having a repeating pattern of a hollow structure of an arbitrary shape having a sucker performance that can be fixed by adsorption as described above. In the present specification, “copying technology” means electrophotography, ink jet recording, thermal transfer, etc., in which an image is formed by using toner, electrostatic toner, etc., and a gravure in which a plate is raised and printed by using a printing machine. It is to be distinguished from printing or the like.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described with reference to the drawings. In the present invention, as the base film 2, a synthetic resin film such as a polyester film, an acrylic film, a polycarbonate film, a polyolefin film, or a thin metal film can be used. The polyester film is excellent in mechanical strength, dimensional stability, and thermal stability, and the acrylic film is excellent in transparency. Therefore, it is necessary to select the base film to be used in relation to the intended use of the film sheet. Before forming the ink receiving layer, these substrate films may be subjected to a treatment for improving the adhesion of the substrate film to the ink, for example, corona discharge treatment.

The resin used as the base for making the ink composition can be selected in relation to the material used as the base film, eg ink when using a polyester film as the base film. When a polyester resin is used as the base resin and a vinyl chloride-vinyl acetate copolymer is used when an acrylic film is used, a strong bond between the base film and the ink receiving layer can be formed. Also, as the ink base, one that has a good receptivity for image forming ink in relation to copying technology,
For example, since a water-based ink is used in the ink jet recording technology, a water-soluble ink having good acceptability is used, and a heat-fixing toner is used in electrophotography. It is important to select a toner with good acceptability. Further, if the ink base contains a component that can be solidified or cured by polymerization, crosslinking, etc. by ionizing radiation such as ultraviolet rays or electron beams, the formation of the ink receiving layer becomes relatively easy. be able to. Such ink bases include those containing a water-soluble monomer, those containing a water-insoluble monomer or a component capable of crosslinking in the form of a solution or emulsion, both of which are ink-receiving layers of the present invention. It can be used for producing an ink composition when obtaining a film sheet having a film formed thereon. Examples of the water-soluble monomer that is solidified or cured by ionizing radiation include (meth) acrylic acid ester of polyhydric alcohol, (meth) acrylic acid ester of N-alkylamino alcohol,
Polyethylene glycol (meth) acrylic acid ester,
Examples thereof include N-alkyl (meth) acrylic acid amides and vinyl ethers of polyhydric alcohols. Examples of the water-insoluble monomer include 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, neopentyl glycol diacrylate, vinyl caprolactam, 2-ethylhexyl acrylate and the like.

The beads mixed in the ink for forming the ink receiving layer are preferably spherical and have a narrow particle size distribution, such as glass beads, silicon resin, urethane resin,
Resin beads made of urea resin, nylon, polyolefin, fluororesin or the like can be used. Although the image formation characteristics of the ink layer surface by the copying technique are improved by blending the beads, the film sheet on which the ink receiving layer is formed by using urethane resin beads has a better movement of the mouse and is a mat when using the mouse. The effect that the surface is less worn and the surface is not scratched is obtained, and an image with better color reproducibility can be formed than when beads of other materials are used.

The beads have a particle size of 5 μ-40
.mu., preferably 20.mu.-30.mu., is used, and is blended in an amount of 15-35% by weight with respect to the ink base, and the layer formed by the ink reproduces the resolution, density and color of an image formed by a copying technique. It is possible to improve the image forming characteristics such as the property. If the particle size is less than 10 μm, the image quality of the image formed by the copying technique is not improved, and if it is larger than 40 μm, the light diffusion effect is small, the surface friction is large, and the surface is apt to be scratched.

The thickness of the ink receiving layer formed on the surface of the film by the ink is 5 μ to 100 μ, preferably 10 μ to 80 μ in order to achieve the object of the present invention. By adjusting the thickness of the layer, light transmittance, diffusivity, image characteristics, etc. are changed. Therefore, it may be appropriately adjusted within the above range depending on what kind of display is used and the intended use. it can.

The ink composition for forming the ink receiving layer has an average particle size of 1 to 2 which improves the receiving property of the ink jet ink without deteriorating the properties of the receiving layer and the formability of the layer.
Natural fiber powder or protein powder of about 0 μm may be added, and components such as white pigments, colorants, and leveling agents that have been conventionally added to inks can be obtained with high resolution and high resolution by the copying technology of the ink receiving layer. It can be blended within a range that does not deteriorate the characteristics capable of forming a density image.

[0012] A hollow structure of any shape having a function of physically sticking, which can be fixed by adsorption so that it can be peeled off on a flat surface, for example, a structure having sucker performance, and a pattern (structure sticking) The sucker layer is, for example, a urethane resin, an epoxy resin, a silicone resin, an ink base such as a vinyl chloride resin, a curing agent, a plasticizer, a solvent and other additives are mixed to adjust flexibility and flexibility, An ink composition capable of forming a hollow structure exhibiting sucker performance is prepared, and the ink composition is used to form a structure having a repeating unit of a hollow structure exhibiting sucker performance by a screen printing method. Commercially available inks used for such applications include UVQVN-000 medium, UVQVN-70425 special medium and QVN manufactured by Teikoku Ink Mfg. Co., Ltd.
Examples include −000 medium. FIG. 1 is a front view showing an example of a film sheet having an ink receiving layer 1 in which a sucker layer is further provided on the film sheet of the present invention, and an image is formed by a copying ink 4 (toner).
2 is a back view of the film sheet of the present invention in which the suction cup layer 3 is provided, and FIG. 3 is a sectional view taken along the line AA of FIG.

[0013]

Examples and Comparative Examples Reference Example 1 A polyester film having a thickness of 188 μ is used as a substrate. On one surface of the film, an ink composition containing the following components as main components is used to form an ink receiving layer. Ink composition beads: 25 g of urethane resin beads with an average particle size of 25μ
(25% by weight in 100% by weight of ink) Ketone-based solvent 10 g Hydrocarbon-based solvent 20 g Polyester-based resin 30 g Titanium pigment 35 g Auxiliary agent (silicone oil, etc.) 5 g Ink receiving layer formation and its characteristics Screen 150 mesh ink receiving layer Thickness of 20 μm Image formation Color image formed by electrophotography Evaluation of formed image Visually, glossiness (glare), softness of image, resolution, and color reproducibility were compared with the original. A subject (evaluation panel) psychologically evaluated each characteristic, and added 3 points for good, 2 points for normal, and 1 point for bad. ◯: Addition point is 11 or more Δ: Addition point is 10 to 8 ×: 7 or less Evaluation results are shown in Table 1.

Reference Example 2 On the surface of the film sheet base material of Example 1 opposite to the surface on which the ink receiving layer is formed, UV manufactured by Teikoku Ink Mfg. Co., Ltd.
A suction layer was formed from the QVN-70425 special medium ink composition. The obtained film sheet having the ink receiving layer formed into a mouse pad shape, and a color copying machine
A mouse pad was obtained by forming a color image of a favorite landscape. Image formation and evaluation of the formed image were performed in the same manner as in Example 1. The evaluation results are shown in Table 1. Rollability of mouse: Ease of positioning the pointer and rolling sensation of mouse were evaluated by a panelist by psychological evaluation. Scratchability of the film sheet surface: The surface scratches when the mouse was rolled 3000 times were visually observed. In each evaluation, ◯: good Δ: normal ×: bad The results are shown in Table 1.

Example 1 A 188μ polyester film is used as a substrate. An ink receiving layer is formed on one surface of the film by using an ink composition containing the following main components. Ink composition Beads: Urethane resin beads having an average particle size of 25 μm 25 g Vinylcaprolactam 15.0 g Tripropylene glycol diacrylate 22.0 g Bifunctional urethane oligomer 30.0 g Acetophenone photoinitiator 8.0 g Titanium pigment 20.0 g Auxiliary agent (silicone oil, etc.) 5.0 g Formation of ink receiving layer and its characteristics Screen 150 mesh used Thickness of ink receiving layer 30μ Cured with an amount of ultraviolet light of 500 mJ / cm ² . further,
A suction cup layer was formed on the surface of the above-mentioned substrate opposite to the surface on which the ink receiving layer was formed, using a UVQVN-70425 special medium ink composition manufactured by Teikoku Ink Mfg. Co., Ltd. The obtained film sheet was formed into a mouse pad, and a color image of a desired landscape was formed on the mouse sheet to obtain a mouse pad. Image formation and evaluation of the formed image were performed in the same manner as in Example 1. The evaluation results are shown in Table 1. Rollability of mouse: Ease of positioning the pointer and rolling sensation of mouse were evaluated by a panelist by psychological evaluation. Scratchability of the film sheet surface: The surface scratches when the mouse was rolled 3000 times were visually observed. In each evaluation, ◯: good Δ: normal ×: bad The results are shown in Table 1.

Comparative Examples 1 and 2 When the particle diameter of the compounded beads is set to 2 μ which is smaller than 5 μ (Comparative Example 1), the diameter of beads is 60 μ which is larger than 40 μ.
Example 2 was repeated except that (Comparative Example 2).
The evaluation results are shown in Table 1.

[0017]

[Table 1]

[0018]

INDUSTRIAL APPLICABILITY The film sheet having the ink receiving layer of the present invention has improved image forming characteristics by a copying technique,
The excellent effect that a signboard, a POP, etc. used for a display etc. can be easily produced is brought about.

[Brief description of drawings]

FIG. 1 is a front view of a film sheet according to an embodiment of the present invention.

FIG. 2 is a back view of the film sheet according to the embodiment of the present invention.

3 is a cross-sectional view taken along the line AA of the film sheet of FIG. 1 according to an embodiment of the present invention.

[Explanation of symbols]

1 Ink receiving layer 2 Base film 3 Sucker layer 4
Copy ink

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Claims (2)

(57) [Claims] 1. A urethane resin bead 15 which is a sphere having an average particle diameter of 5 μm to 40 μm formed by a printing method on the surface of a base film.
˜35% by weight is compounded with components that solidify by ionizing radiation
The thickness 5μ~ using inks formulated into ink base was
A film sheet having an ink receiving layer capable of forming an image by a 100 μ copying technique. 2. The film sheet according to claim 1 , wherein a screen printing method is used as a printing method.