JP2000037949A - Ink jet recording film for advertisement and manufacture of signboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording film for advertisement and manufacture of a signboard which can be applied, in a best fitting manner, even to an uneven face to which the film is to be fitted, and is highly weatherable and further does not produce an injurious substance during incineration. SOLUTION: A multilayer laminated sheet has at least a single layer of soft polyolefin interposed between plural polypropylene layers and shoes that the elasticity modulus (MD) in one direction and the elasticity modulus (TD) in the orthogonal direction with the one direction are 85 kgf/mm2 or less, the MD/TD being 0.7-1.5. Further an ink receptive layer is formed on the multilayer laminated sheet as a base through an undercoat layer to obtain the ink jet recording film for advertisement and manufacture of a signboard.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording film for producing advertisements and signboards, and more particularly, it can be applied to a surface to be applied having irregularities with good fit, and has good weather resistance. The present invention relates to an ink jet recording film for producing advertisements and signboards which is excellent and does not generate harmful substances when incinerated.

[0002]

2. Description of the Related Art In recent years, ink jet printers and plotters have been widely used as output devices from computers because there is almost no mechanical noise during printout and the running cost associated with printout is low. . These inkjet printers and plotters can be used for producing advertisements, signboards, etc. because they can perform full-color printing at low cost.

[0003] By the way, in applications as advertisements and signs, weather resistance is required for ink jet recording materials, and an ink receiving layer is provided on the surface of a base film made of a plastic film as a paper. Recording films have been used.

[0004] When such an ink jet recording film is used for an advertisement or a signboard, it has to be stuck to an object to be stuck, for example, an uneven surface such as a wall, a shutter or a window. As such a film, a film containing a polyolefin resin as a main component (JP-A-64-36478),
Japanese Patent Application Laid-Open No. H10-58823 has proposed a biaxially stretched film using a composition containing an inorganic pigment and a thermoplastic resin as a base material.

However, it is difficult to apply an ink jet recording film using such a base material with good fit according to the shape of the surface to be adhered, such as unevenness, so that the recording film may be inconsistent with the irregularities on the surface to be adhered. There is a drawback that a space is easily formed between the film and the film, and the appearance is deteriorated. In addition, in order to adhere to a surface to be adhered having irregularities with good fit, an ink jet recording film using a vinyl chloride resin film as a base material is also known, but this film has low weather resistance and plasticity. In order to suppress the bleed out of the agent, it is important to select an undercoat layer, and there are drawbacks such as generation of harmful substances during incineration.

[0006]

SUMMARY OF THE INVENTION The present invention overcomes the drawbacks of the conventional ink jet recording film, and can be applied to a surface to be applied having irregularities with good fit. The object of the present invention is to provide an ink jet recording film for producing advertisements and signboards which has excellent property and does not generate harmful substances when incinerated.

[0007]

Means for Solving the Problems The present inventors have conducted various studies on an ink jet recording film, and as a result,
As a base material, at least one soft polyolefin layer is interposed between a plurality of polypropylene layers, and when a multi-layer laminated sheet having a specific elastic modulus is used, it is applied with good fit even to an adhered surface having irregularities. It has been found that no harmful substances are generated when incinerated when used, and the present invention has been completed based on this finding.

[0008] That is, the present invention provides at least one laminated surface between a plurality of corona-treated polypropylene layers.
Having a laminated structure in which the soft polyolefin layers of the layers are interposed, the elastic modulus in one direction (MD) and the elastic modulus in the direction perpendicular thereto (TD) are each 85 kgf / mm ² or less,
An advertisement, wherein a multilayer laminated sheet having an MD / TD in the range of 0.7 to 1.5 is used as a base material, and an ink receiving layer is provided on the base material via an undercoat layer. An object of the present invention is to provide an ink jet recording film for manufacturing a signboard.

[0009]

DETAILED DESCRIPTION OF THE INVENTION In the ink jet recording film of the present invention, a multi-layer laminated sheet having at least one soft polyolefin layer interposed between a plurality of polypropylene layers is used as a base material. As the material of the plurality of polypropylene layers in this multilayer laminated sheet, those used for ordinary polypropylene-based films,
For example, isotactic propylene homopolymer having crystallinity, ethylene-propylene random copolymer having a low content of ethylene units, ethylene-propylene random having a homo portion composed of propylene homopolymer and ethylene-propylene random having a relatively high ethylene unit content A propylene block copolymer composed of a copolymer part composed of a copolymer, and further each homo part or copolymer part in the propylene block copolymer further copolymerized an α-olefin such as butene-1. Crystalline propylene-ethylene-α consisting of
-Olefin copolymers, and mixtures thereof.

On the other hand, the material used for the soft polyolefin layer interposed between the plurality of polypropylene layers made of the above materials is not particularly limited, and conventionally known soft polyolefin resins such as soft polypropylene resin and ethylene-propylene random Copolymer, ethylene-propylene-diene copolymer, ethylene-butene copolymer,
Propylene-butene copolymer, propylene-ethylene-
Butene copolymers, ethylene-vinyl acetate copolymers and mixtures thereof, and the like.If the flexible polyolefin layer is interposed between the polypropylene layers to form a multilayer laminated sheet, a desired elastic modulus is obtained. As described above, it is preferable that the number of layers to be interpolated is appropriately selected while appropriately selecting from the above materials.

[0011] The plurality of polypropylene layers in the multilayer laminated sheet need to be subjected to corona discharge treatment on the laminated surface, whereby the adhesiveness between the layers in the multilayer laminated sheet is improved, and the polypropylene laminated layer is formed on the multilayer laminated sheet. Adhesion with the undercoat layer to be laminated is also improved. The thickness of the entire multilayer laminated sheet is usually 25 to 400 μm, preferably 50 to 400 μm.
It is selected in the range of 200 μm. Further, the total number of layers of the multilayer laminated sheet is preferably three layers, but may be further increased if desired.

In the present invention, the multilayer laminated sheet used as the base material has an elastic modulus in one direction (MD: machine flow direction) and an elastic modulus (TD) in a direction perpendicular thereto.
Each must be 85 kgf / mm ² or less. When the elastic modulus exceeds 85 kgf / mm ² , the elongation of the base material is poor, and it is difficult to attach the substrate with good fit to the surface to be attached having irregularities. On the other hand, if the elastic modulus is too small, the base material tends to be excessively stretched, and ground cracks may occur in the image area. Considering the fit to the surface to be attached having irregularities and the ground cracks in the image area, the elastic modulus is 1 to 50 kgf / m for both MD and TD.
m ² is preferable, and especially MD is 2.05 to 10 kg.
f / mm ² and TD of 1.7 to 10 kg
Advantageously, it is in the range of f / mm ² . Furthermore, MD
/ TD needs to be in the range of 0.7 to 1.5. If MD / TD deviates from the above range,
When a recorded ink jet recording film is adhered, a space is easily formed between the recording film and the surface to be adhered, resulting in poor appearance.

The multilayer laminated sheet used as the base material is preferably a non-stretched sheet from the viewpoint of the workability of the application. The biaxially stretched film is superior to the non-stretched film in terms of flexibility and heat resistance, but the non-stretched film can be stuck without gaps corresponding to the sticking surface in terms of sticking workability. The multilayer laminated sheet used in the present invention can be made to contain titanium oxide, barium sulfate, calcium carbonate, silica, clay, talc, and the like, so that the surface can be roughened or whitened.

In the ink jet recording film of the present invention, an ink receiving layer is provided on one surface (corona discharge treated surface) of the substrate comprising the multilayer laminated sheet via an undercoat layer. As the undercoat layer, for example, a polyurethane resin, a polyester resin, an acrylic resin, a polyester urethane resin, or the like is used. The undercoat layer not only improves the adhesion between the base material and the ink receiving layer, but also has a role of preventing a plasticizer or the like contained in the base material from bleeding into the ink receiving layer. The thickness of the undercoat layer is usually 0.1 to 3.0 μm, preferably 0.5 to 1.5 μm.
Range.

In the case of using an image recorded by an ink jet printer or a plotter to produce an advertisement or a signboard, a pigment ink having excellent weather resistance and water resistance is often used. For this reason, in the ink jet recording film of the present invention, it is desirable that the ink receiving layer provided on the undercoat layer has good absorbability of the pigment ink and has water resistance. As a binder for forming such an ink receiving layer, for example, polyvinyl alcohol and derivatives thereof, polyvinylpyrrolidone, starch, cellulose, tannin, lignin, alginic acid, polysaccharides such as gum arabic and gelatin, further vinyl acetate, ethylene oxide, Acrylic acid, acrylamide,
Polymers or copolymers obtained from maleic anhydride, phthalic acid and the like can be mentioned. These may be used alone or in combination of two or more. Further, crosslinking may be carried out with a crosslinking agent for improving water resistance, and the degree of crosslinking can be appropriately selected in consideration of ink absorbency. The ink receiving layer includes alumina xerogel, silica,
By containing fine particles such as calcium carbonate, water resistance can be improved, and pigment ink absorption and drying properties can be improved.

The ink receiving layer in the ink jet recording film of the present invention is prepared by dissolving or dispersing a binder and, if desired, a crosslinking agent and fine particles in a predetermined ratio in a solvent to prepare a coating solution, and then forming the coating solution on the undercoat layer. It can be provided by coating and drying according to a conventional method. At this time, various conventionally used additives such as a surfactant, a lubricant, a stabilizer, and a colorant can be added to the ink receiving layer forming coating liquid.

In the ink jet recording film of the present invention, an adhesive layer and a release sheet can be sequentially laminated on the surface of the substrate opposite to the ink receiving layer, if desired. By laminating the pressure-sensitive adhesive layer and the release sheet, it is possible to easily perform the work of sticking to the surface to be stuck, and to improve the transportability when outputting with an ink jet printer and a plotter. In addition, when the ink receiving layer is applied and dried on the substrate, the substrate transportability can be improved and shrinkage due to heat can be prevented. When laminating the adhesive layer and the release sheet, a subbing layer is provided in advance,
It may be laminated thereon.

[0018]

The ink-jet recording film of the present invention can be applied without any gap to the surface to be adhered when producing an advertisement or a signboard, so that a signboard or an advertisement that looks good can be obtained. Furthermore, since the plasticizer in the base material does not bleed into the ink receiving layer over time due to excellent weather resistance, it does not damage the image, and does not generate harmful substances when incinerated. Has features.

[0019]

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

The physical properties of the recording film were evaluated according to the following methods. (1) Adherability The state of the uneven portion when manually attached to a shutter having irregularities on the surface was visually observed and evaluated according to the following criteria. ：: There is no gap between the unevenness and the recording film, and the film is bent in a natural state. Δ: There is no gap between the irregularities and the recording film, but the recording film has folds. X: There is a gap between the unevenness and the recording film. (2) Weather resistance The film was left standing for 3 months under outdoor exposure, and changes in the base film were evaluated according to the following criteria. ：: No change is seen at all. X: Yellowish due to changes in stabilizers, additives and the like. (3) Incineration property of waste film ○: No problem. ×: Generates harmful substances during combustion.

Example 1 (1) Polyvinyl alcohol (degree of polymerization: 100, degree of saponification: 78.5 to 81.5 mol%: Gohsenol KH-1)
7) 4.9 parts by weight, 1.2 parts by weight of an acid-treated synthetic silica powder having a weight average particle diameter of 3.5 μm, 10.8 parts by weight of a non-acid-treated synthetic silica powder (weight average particle diameter of 3.5 μm)
m, oil absorption 210 ml / 100 g: manufactured by Fuji Silysia Ltd.), 0.5 parts by weight of urea resin, 0.7 parts by weight of a 20% by weight aqueous ammonium chloride solution, 17.5 parts by weight of ethanol,
1.9 parts by weight of propylene glycol monomethyl ether and 62.5 parts by weight of water were mixed to prepare a coating liquid for forming an ink receiving layer. (2) Corona discharge-treated multilayer polyolefin film having a thickness of 150 μm [MD 2.08 kgf / mm ² , TD
1.72 kgf / mm ² , consisting of two layers of polypropylene and one layer of soft polyolefin], on one side of which an undercoat layer of urethane resin having a thickness of 1.0 μm was provided.
Next, the ink receiving layer forming coating liquid prepared in (1) is applied on the undercoat layer with a wire bar, and heated at 130 ° C. for 5 minutes to form an ink receiving layer having a thickness of about 10 μm. A recording film for inkjet was produced. Table 1 shows the physical properties of the recording film.

Example 2 (1) 3.5 parts by weight of polyvinyl alcohol (degree of polymerization: 3500, degree of saponification: 88.0 mol%), pseudo-boehmite (catalyst AP-3, manufactured by Catalyst Kasei Co., Ltd., 76.3 Al ₂ O ₃₎
(Weight%, CH ₃ COOH 3.7 weight%) 18.35 parts by weight, 2 parts by weight of propylene glycol monomethyl ether, 0.14 parts by weight of acetic acid and 76.01 parts by weight of water are uniformly mixed to form an ink receiving layer. A coating solution was prepared. (2) Ink jetting was performed in the same manner as in Example 1 except that the coating liquid for forming the ink receiving layer was changed to that prepared in (1) and the thickness of the ink receiving layer was 30 μm. A recording film was prepared. Table 1 shows the physical properties of the recording film.

Comparative Example 1 The procedure of Example 1 was repeated except that the base film was changed to a synthetic paper having a multilayer structure (product name: YUPO FPG-80, thickness 80 μm, manufactured by Oji Oil Chemicals). In the same manner as in the above, an ink jet recording film was produced. Table 1 shows the physical properties of the recording film.

Comparative Example 2 Ink jet was performed in the same manner as in Example 1 except that the base film was changed to a transparent vinyl chloride resin film (comprising 40 parts by weight of a plasticizer with respect to 100 parts by weight of resin). A recording film was prepared. Table 1 shows the physical properties of the recording film.

Comparative Example 3 An ink jet recording film was produced in the same manner as in Example 1 except that the substrate was changed to a transparent polyethylene terephthalate film. Table 1 shows the physical properties of the recording film.

[0026]

[Table 1]

Continued on the front page (72) Inventor Tadashi Tomizawa 4-11-2 Ginza, Chuo-ku, Tokyo Inside Somaru Corporation (72) Inventor Naoki Sakazume 4-1-2-1, Ginza, Chuo-ku, Tokyo Inside Somaru Corporation F-term (reference) 2C056 EA13 FC06 2H086 BA16 BA19 BA60 4F100 AA20H AK03C AK07A AK07B AK21 AK51 AR00E AT00D BA04 BA07 BA10A BA10E BA13 EJ55A EJ55B GB90 JD14E JK13C JL09 YY00

Claims (2)

[Claims] 1. A laminate structure in which at least one soft polyolefin layer is interposed between a plurality of polypropylene layers whose laminate surfaces have been subjected to corona discharge treatment, and has a unidirectional elastic modulus (MD) and a direction perpendicular thereto. The base material is a multilayer laminated sheet having a modulus of elasticity (TD) of 85 kgf / mm ² or less and an MD / TD in the range of 0.7 to 1.5, and forming an undercoat layer on the base material. An ink jet recording film for producing advertisements and signboards, characterized in that an ink receiving layer is provided therebetween. 2. The inkjet recording film according to claim 1, wherein the multilayer laminated sheet is a non-stretched sheet.