JPH10187043A - Adhesive sheet and label for ink jet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive sheet and label for ink jet that can be clearly printed, has durability, and can be simply stuck to a adhered object. SOLUTION: An ink reception layer 1 is provided on the surface of a process sheet 4, an adhesive layer 2 is provided on the surface of the ink reception layer 1 and a peeling sheet 3 is provided on the surface of the adhesive layer 2 to form an adhesive sheet for ink jet. In the case of using it, the process sheet 4 is removed. Further, the adhesive layer 2 is provided on one surface of the ink reception layer 1, the peeling sheet 3 is provided on the surface of the adhesive layer 2, and ink 6 is stuck in pattern on the other surface of the ink reception layer 1 and a transparent protection sheet 5 is further provided on its surface to obtain a label.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive sheet and a label for inkjet, and more particularly, to an adhesive sheet and a label for inkjet which can be printed clearly, are durable, and can be easily attached to an adherend. .

[0002]

2. Description of the Related Art In recent years, the functions of an ink jet printer have been advanced, and its expressive power has become comparable to a photographic image. However, an ink jet printer can usually print only a thin and flexible sheet such as paper or film.
When printing on a hard material or an article having irregularities or a curved surface, printing is performed on a separately prepared adhesive sheet for ink jet, and the printed adhesive sheet is attached to a target article to substitute for printing. However, the conventional ink-jet adhesive sheet is thick, the boundary between the attached portion and the non-applied portion becomes clear, and the design is not satisfactory. In addition, in order to adhere to an article having irregularities or a curved surface, it is necessary to use a base material having extensibility that can follow it, but in that case, the ink receiving layer cannot follow the extensibility of the base material, and the layer cracks. There were problems such as waking up and powder falling.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned state of the art, and has excellent design properties.
It is an object of the present invention to provide an inkjet adhesive sheet that can be stuck to an article having irregularities or a curved surface without any problem, and a label using the inkjet adhesive sheet.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that an adhesive layer is directly provided on one surface of an ink receiving layer without using a support sheet. It has been found that the above-mentioned object can be achieved by providing the above, and it is possible to produce a thin object by omitting the support sheet, and based on this finding, the present invention has been completed.

That is, the present invention provides an ink-jet adhesive sheet characterized in that an adhesive layer is provided on one surface of an ink receiving layer, and a release sheet is provided on the surface of the adhesive layer. Things. Further, according to the present invention, an adhesive layer is provided on one surface of the ink receiving layer,
A release sheet is provided on the surface of the adhesive layer, and ink is attached in a pattern on the other surface of the ink receiving layer,
Further, the present invention provides a label having a transparent protective sheet provided on its surface. Hereinafter, the present invention will be described in detail.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The ink receiving layer in the ink jet adhesive sheet of the present invention has its surface printed with ink by ink jet and contains a binder and a pigment. Examples of the binder include an organic binder and an inorganic binder. As the organic binder, for example, polyester resin, polyurethane resin, polyacrylic resin, polyol resin, polyvinyl alcohol, polyvinylpyrrolidone, cellulose derivative, acetate resin, polyvinyl chloride resin, polyimide resin, latex resin, starch,
Gelatin, vegetable protein, casein, gum arabic, albumin and the like. Examples of the inorganic binder include silica sol, alumina sol, zirconia sol, and inorganic oxide sol such as titania sol. The binder is
One type may be used alone, or two or more types may be used in combination.

[0007] Examples of pigments include inorganic pigments and organic pigments. As the inorganic pigment, for example, silica, clay,
Talc, kaolin, diatomaceous earth, aluminum hydroxide,
Examples include magnesium hydroxide, alumina, calcium carbonate, barium sulfate, titanium oxide, and zeolite.
Examples of the organic pigment include an ion exchange resin, a urea resin, a polystyrene resin, and a polyacrylic resin. The average particle size of the pigment is not particularly limited, but is usually preferably from 0.001 to 30 μm, particularly preferably from 0.01 to 30 μm.
20 μm is preferred. One type of pigment may be used alone, or two or more types may be used in combination. The mixing ratio of the binder and the pigment is not particularly limited, but is usually 100: 1 to 100:
1000, preferably 100: 10 to 100: 5
00. Various additives such as a dispersant, a leveling agent, an antioxidant, an ultraviolet absorber, a lubricant, and an antifoaming agent can be added to the ink receiving layer as needed.
The thickness of the ink receiving layer is usually 3 to 100 μm,
Preferably it is 5 to 20 μm.

The adhesive layer in the adhesive sheet for ink jet of the present invention can be constituted by a pressure-sensitive adhesive or a heat-sensitive adhesive. Specific examples of the pressure-sensitive adhesive include natural rubber, synthetic rubber, acrylic resin, polyvinyl ether resin, urethane resin, and silicone resin. Specific examples of synthetic rubbers include styrene-butadiene rubber, polyisobutylene rubber, isobutylene-isoprene rubber, isoprene rubber, styrene-isoprene block copolymer, styrene-butadiene block copolymer, and styrene-ethylene-butylene block copolymer. Coalescence and the like. Specific examples of acrylic resin-based
Acrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, acrylic acid 2-
Homopolymers or copolymers such as ethylhexyl, ethyl methacrylate, butyl methacrylate, and acrylonitrile are exemplified. Specific examples of the polyvinyl ether resin include polyvinyl ether and polyvinyl isobutyl ether. Specific examples of the silicone resin include dimethylpolysiloxane and the like. Specific examples of the heat-sensitive adhesive include, for example, polyethylene, ethylene-vinyl acetate resin, polyester resin, polyurethane resin, and synthetic rubber. The adhesive can be used alone or in combination of two or more.

The above-mentioned adhesive may further contain, if necessary, an adhesion-imparting agent, a filler, a softener, a wax, an antioxidant, an ultraviolet absorber, a crosslinking agent and the like. As the adhesion imparting agent, rosin resin, terpene phenol resin, terpene resin, aromatic hydrocarbon-modified terpene resin,
Petroleum resin, coumarone-indene resin, styrene resin,
Phenolic resins, xylene resins and the like can be mentioned. Examples of the filler include zinc white, titanium oxide, silica, calcium carbonate, barium sulfate, and the like. Examples of the softener include process oil, liquid rubber, plasticizer, and the like. Examples of the wax include a natural wax, a mineral wax, a polyethylene wax, and a paraffin wax. As antioxidants,
Anilide type, phenol type, phosphite type, thioester type and the like can be mentioned. Examples of the ultraviolet absorber include benzophenone-based and benzotriazole-based,
Examples of the crosslinking agent include an epoxy type, an isocyanate type, and a metal chelate type.

The method of providing the adhesive layer can be carried out by various methods. For example, a method of dissolving the above-mentioned adhesive in a suitable solvent and applying, or a method of dispersing or emulsifying in an appropriate medium and applying the same. , A method of coating with a solvent or coating with a calender roll, a method of applying and forming an adhesive layer in advance on release paper, a method of laminating the adhesive layer, a method of applying a double-sided tape with the adhesive applied to both sides of the core sheet. Lamination method and the like can be mentioned. Preferred methods among these methods are a solvent dissolving method of dissolving in a solvent for application, a method of bonding an adhesive layer on release paper, and a method of laminating a double-sided tape in which the adhesive is applied to both sides of a core sheet. is there. The material of the core sheet is not particularly limited, and may be paper,
Various sheet materials such as a nonwoven fabric and a plastic film are exemplified. The thickness of the adhesive layer is not particularly limited, and may be generally in the range of 3 to 100 μm, and preferably in the range of 10 to 40 μm.

The release sheet in the adhesive sheet for ink jet of the present invention may be a release sheet having at least one surface made of a release sheet, and the support sheet may be subjected to a release treatment if necessary. Examples of the support sheet include paper, synthetic paper, and plastic film. Examples of the paper include glassine paper and laminated paper, and examples of the plastic film include a polyolefin resin such as a polyethylene resin and a polypropylene resin, a polybutylene terephthalate resin, a polyester resin such as a polyethylene terephthalate resin, an acetate resin, and a polystyrene resin. Examples include, but are not limited to, plastic films such as vinyl chloride resin.

[0012] Silicone resin,
Examples thereof include an alkyd resin, a fluorine resin, a cellulose resin, a melamine resin, an acrylic resin, a polyurethane resin, and a polyester resin, and a silicone resin and an alkyd resin are preferable. Various methods can be used to provide the release treatment material on one side of the support sheet, and examples thereof include a method of applying the release treatment material by application, transfer, printing, and the like, and a method of laminating a resin film. The thickness of the release sheet is not particularly limited, and may be appropriately selected. In the present invention, the release sheet is released when the inkjet adhesive sheet is attached to the adherend, and the surface of the adhesive layer is exposed. With this adhesive layer, it is possible to attach the adhesive to an adherend. For this reason, the adhesive force at the interface between the release sheet and the adhesive layer needs to be weaker than the adhesive force at the interface between the ink receiving layer and the adhesive layer.

Next, an appropriate method for producing the adhesive sheet for ink jet of the present invention will be described. As a suitable method for manufacturing the adhesive sheet for inkjet of the present invention, for example, an ink receiving layer is provided on one side of a process sheet, and then an adhesive layer and a release sheet are sequentially laminated on the surface of the ink receiving layer. Or a method in which an ink-receiving layer is provided on one side of a process sheet, and a laminated sheet having a release sheet provided with an adhesive layer on one side is subsequently attached to the surface of the ink-receiving layer.
As a method of providing the ink receiving layer on one side of the process sheet, a coating solution in which a binder, a pigment, and various additives used as needed constituting the ink receiving layer are dispersed in a solvent is coated on one side of the process sheet. Method.
The solid component content of the coating solution may be usually 20 to 70% by weight.

According to this manufacturing method, an adhesive layer is provided on one surface of the ink receiving layer, a release sheet is provided on the surface of the adhesive layer, and a process sheet is provided on the other surface of the ink receiving layer. The obtained adhesive sheet for inkjet is obtained. The material of the process sheet is basically the same as the release sheet. In the present invention, the process sheet has a function of forming the ink receiving layer and protecting the ink receiving layer until use. The process sheet is peeled from the ink receiving layer at the time of printing, and printing can be performed. The process sheet is used when manufacturing the adhesive sheet for ink jet, and may be removed when the adhesive sheet for ink jet is used. Therefore, the adhesive force at the interface between the process sheet and the ink receiving layer needs to be smaller than the adhesive force at the interface between the ink receiving layer and the adhesive layer and the adhesive force at the interface between the adhesive layer and the release sheet.

Next, the label of the present invention will be described.
The label of the present invention utilizes the above-mentioned adhesive sheet for inkjet of the present invention, and the ink receiving layer, the adhesive layer and the release sheet are the same as described above. In the label of the present invention, ink printed by inkjet printing is attached to the surface of the ink receiving layer, and a transparent protective sheet is further laminated thereon. Any transparent protective sheet may be used as long as it has transparency enough to allow the ink pattern to be seen through from above. Suitable examples of the transparent protective sheet include polyethylene resin, polyolefin resin such as polypropylene resin, polybutylene terephthalate resin, polyester resin such as polyethylene terephthalate resin, acetate resin, polystyrene resin,
Examples include, but are not limited to, transparent plastic films such as vinyl chloride resin. Preferred transparent protective sheets include transparent film bases made of polypropylene resin, polyethylene terephthalate resin, and vinyl chloride resin. In particular, if a stretchable film such as a polyolefin-based resin or a plasticized vinyl chloride resin is used, an article having unevenness or a curved surface can be followed well.

The thickness of the transparent protective sheet may be appropriately selected, but is usually in the range of 10 to 200 μm, preferably in the range of 20 to 100 μm. In order to provide the transparent protective sheet on the surface of the ink receiving layer on which the pattern of the ink is attached, both may be laminated via a pressure-sensitive or heat-sensitive adhesive, or the transparent protective sheet itself has a heat-sensitive adhesive property. In this case, the layers may be directly laminated by heating. The same adhesive as the adhesive used for the adhesive layer can be used as the adhesive used when both are laminated via the adhesive layer. Further, by including an antioxidant such as an antioxidant and an ultraviolet absorber in the transparent protective sheet, the durability of the label of the present invention and the pattern of the ink printed on the label can be improved. The anti-aging agent may be kneaded into the transparent protective sheet, or may be added to the interposed adhesive layer.

The pattern of the ink in the label of the present invention is as follows:
Various characters, symbols, signs, points, lines, figures, or combinations of two or more of them, or combinations of these with colors (for example, pictures, photographic images, etc.), and any pattern Can be. The size of the label of the present invention may be appropriately selected depending on the use. The label of the present invention can be used for various applications, and is particularly suitable for use on signboards and the like.

[0018]

Next, the present invention will be described more specifically with reference to examples. The present invention is not limited by these examples.

Examples Urethane-based resins (Paterracol IJ-2,
100 parts by weight of Dainippon Ink Industries, Ltd.) and 100 parts by weight of amorphous silica (Fine Seal X-45, manufactured by Tokuyama Corporation, average particle size: 5 μm) as a pigment (binder and pigment) An aqueous dispersion containing 800 parts by weight of water and a water dispersion containing 800 parts by weight of water were applied to one surface of a process sheet 4 (a silicone resin applied on a polyethylene terephthalate film (thickness: 50 μm)) by a knife coater. Coating, drying, and ink receiving layer 1
(Thickness after drying: 15 μm). Subsequently, a pressure-sensitive adhesive is applied to the surface of a release sheet 3 (a release sheet in which a silicone resin layer is provided on the surface of a polyethylene resin film of a polyethylene laminated paper (a laminate of a polyethylene resin film and glassine paper) and a thickness of 70 μm). Layer 2 (acrylic pressure-sensitive adhesive, PK (Lintech Co., Ltd.)
) And dried thickness: 30 μm), and dried, and bonded together so that the pressure-sensitive adhesive layer 2 was disposed on the surface of the ink receiving layer 1 to obtain an adhesive sheet for inkjet with a process sheet. This ink-jet adhesive sheet with a process sheet has the configuration shown in FIG.

Comparative Example A polyethylene terephthalate film (thickness: 100 μm) was used as a support without using the process sheet in the example.
m), the same ink-receiving layer as in the example is applied to one side of the support film with a knife coater, dried and subsequently applied to the opposite surface of the support film as pressure-sensitive as in the example. Apply the adhesive with a knife coater, dry,
It was bonded to the same release sheet as in the example.

(1) Powder drop-off test of ink receiving layer The process sheet of the ink-jet adhesive sheet with the process sheet obtained in the example was peeled off to obtain an ink-jet adhesive sheet having the structure shown in FIG. This inkjet adhesive sheet was cut into a size of 15 × 150 mm to obtain a sample. In addition, the adhesive sheet for inkjet of the comparative example was a sample of the same size. These samples were subjected to a reciprocating test 50 times with a load of 1 kg using an Olsen-type folding tester (manufactured by Tozai Seiki Co., Ltd.), and thereafter, it was confirmed that the ink receiving layer had fallen out of powder. Table 1 shows the results.

[0022]

[Table 1]

(2) Curved surface follow-up test The process sheet of the ink-jet adhesive sheet with the process sheet obtained in the example was peeled off, a predetermined printing was performed with ink 6, and then a transparent protective sheet 5 was formed on the surface of the ink receiving layer 1.
(A transparent acrylic pressure-sensitive adhesive (PL Shin, manufactured by Lintec Co., Ltd., thickness: 20 μm) coated on one side of a transparent polyvinyl chloride film (thickness: 50 μm) containing an ultraviolet absorber) is applied, and 20 It was cut off to a size of × 35 mm to obtain a label sample having the configuration shown in FIG.
Further, a transparent protective sheet similar to the above was attached to the surface of the ink receiving layer 1 of the ink-jet adhesive sheet obtained in the comparative example, and cut into a size of 20 × 35 mm to obtain a sample of the comparative example. The release sheets of these labels were peeled off, and the labels were adhered to the curved surfaces of polyethylene, polypropylene, and glass round bars each having a diameter of 15 mm with the emerged pressure-sensitive adhesive layer, and it was confirmed whether or not there was floating. A sample without floating was evaluated as ○, and a sample with floating was evaluated as ×. Table 2 shows the results.

[0024]

[Table 2]

[0025]

The ink-jet adhesive sheet of the present invention has a small amount of powder from the ink receiving layer, can be printed clearly, and can be easily applied. Further, the label of the present invention is easy to apply. Furthermore, the adhesive sheet and label for inkjet of the present invention can be made thin by omitting the support sheet.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of an ink-jet adhesive sheet of the present invention.

FIG. 2 is a cross-sectional view of an example in which a process sheet is peeled off from the adhesive sheet for inkjet according to the present invention.

FIG. 3 is a sectional view of one embodiment of the label of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink receiving layer 2 Pressure sensitive adhesive layer 3 Release sheet 4 Process sheet 5 Transparent protective sheet 6 Ink

Claims (3)

[Claims] An ink-jet adhesive sheet comprising: an adhesive layer provided on one surface of an ink receiving layer; and a release sheet provided on the surface of the adhesive layer. 2. The ink-jet adhesive sheet according to claim 1, wherein a process sheet is provided on the other surface of the ink receiving layer. 3. An adhesive layer is provided on one surface of the ink receiving layer, and a release sheet is provided on the surface of the adhesive layer.
A label, wherein ink is attached in a pattern on the other surface of the ink receiving layer, and a transparent protective sheet is further provided on the surface.