JP2001171054A - Suction laminated body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suction laminated body of which the affixing/peeling can be repeatedly performed, and wherein there is no transfer of an adherent layer to an affixing objective, and in addition, an image-forming by printing or the like is possible. SOLUTION: This suction laminated body has a sucker layer on one of the surfaces of a base material, and has an image-receiving layer for forming an image on the other surface of the base material. For the sucker layer, the sucker layer surface is formed by removing the surface of a foamed layer, which is formed by expanding an acrylic resin, by cutting and/or breaking. Then, on the surface of the sucker layer, a plurality of air bubbles which are formed in the foamed layer are cut, and fine suckers are formed in such a manner that the internal surfaces of the air bubbles communicate with the surface of the sucker layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adsorbent laminate which can be repeatedly peeled off, has no adhesive layer transferred to an object to be pasted, and can form an image by printing or the like.

[0002]

2. Description of the Related Art Sheets that can be peeled and peeled many times have been used as sheets used for advertisements and product displays in stores and the like. As such a sheet,
There is a thing which has an adhesive layer that can be peeled off by applying a coating material in a mesh shape by printing and forming it in a pseudo sucker shape, but the adhesive layer has a low adhesive strength, and during repeated use, There are problems such as a decrease in adhesiveness due to adhesion of dust and the like, and a transfer of the adhesive layer to an object to be adhered.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides an adsorption laminate which has no adhesive layer, does not transfer an adhesive to an object to be adhered, and can maintain a high adhesive strength for a long period of time. Aim.

[0004]

The present invention relates to a laminate having a sucker layer on one surface of a substrate and an image receiving layer for forming an image on the other surface of the substrate, The suction layer is formed by cutting and / or cutting the surface of a foam molding layer formed by foaming an acrylic resin to form a suction cup surface, and a plurality of suction layers formed inside the foam molding layer on the suction cup surface. An adsorbed laminate characterized in that bubbles are cut and the inner surface of the bubbles communicates with the surface of the suction layer to form a fine suction cup.

[0005] The adsorption laminate of the present invention is not an adhesive layer,
By having a sucker layer, a member for sticking such as an adhesive is transferred to the sticking target, or the sticking strength is reduced,
The object is not contaminated, and a high adhesive strength can be maintained for a long time. Further, by having the image receiving layer, clear images such as characters and images can be formed by various image forming methods described below. Furthermore, the suction cup in the present invention can be formed by a simple manufacturing method, and an adsorption laminate can be easily obtained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The substrate used in the present invention is not particularly limited as long as an image receiving layer and a sucker layer can be formed, as long as the function of the present invention is not impaired.
The use of a metal such as aluminum may be a composite material such as a multilayer structure made of the same or different materials. Examples of the synthetic resin include polyester resins such as polyethylene terephthalate, polyolefin resins such as polypropylene, polystyrene resins, acrylic resins, methacrylic resins, and cellulose acetates. Further, a mixture of two or more of the above resins may be used. Further, other components such as additives, colorants, lubricants, etc. may be included. The substrate used in the present invention is preferably a film made of a synthetic resin, and more preferably a film made of a polyethylene terephthalate resin.

[0007] The thickness of the substrate used in the present invention is not particularly limited, and can be appropriately set according to desired physical properties, applications, and the like. In the case of the recording method, the thickness is 5
It is preferably from 0 to 100 μm.

[0008] The method for producing the substrate is not particularly limited. For example, when the substrate is a film made of a synthetic resin, a film forming method such as an extrusion method using a generally used T-die or the like and an inflation method. Alternatively, a lamination method such as a co-extrusion method or a lamination method can be used.
Further, the plastic film used for the base material may be subjected to a stretching treatment in a uniaxial direction or a biaxial direction as necessary. Film production conditions depend on the material used, thickness,
It can be set appropriately according to desired physical properties and the like.

When another layer such as an image receiving layer is provided as described later, the surface of the base material may be subjected to a surface treatment such as a corona discharge treatment or the like in order to enhance the adhesiveness with the other layer. Or an undercoat layer made of such as

In the present invention, the image receiving layer is a layer having a function of forming an image. For example, a recording material such as ink is fixed, or the components contained in the image receiving layer themselves change due to heat or the like. Is formed. The material constituting the image receiving layer, the configuration such as the thickness, and the method for forming the image receiving layer can be selected according to the intended image forming method for the adsorption laminate of the present invention, the intended use of the adsorption laminate, and the like. For example,
As described below, when the image forming method for the adsorption laminate of the present invention is an ink jet recording method and the ink used is a hydrophilic ink, the image receiving layer is preferably made of a resin containing a hydrophilic polymer. .

Hereinafter, an image receiving layer (hereinafter referred to as an ink receiving layer) when an ink jet recording system is used as an image forming method will be described. As a material constituting the ink receiving layer, for example, olefin-based polymer, styrene-based polymer, polyester, polyamide, polycarbonate,
Vinyl polymers, acrylic polymers, polyurethanes, polysulfones, polymers derived from epoxides, cellulose derivatives, and the like, which enhance the ink absorbency,
In order to improve printability, it is preferable to contain a hydrophilic polymer.

Examples of the hydrophilic polymer include a cellulose derivative, a polyvinyl alcohol polymer, a polyethylene polymer, a polyvinyl acetate copolymer, a polyalkylene oxide unit, a carboxyl group, a sulfonic acid group, an amino group, and acetyl. Examples of the polymer include a polymer having an acid anhydride unit derived from a group or maleic anhydride, a salt thereof, and a nitrogen-containing polymer. These may be used as a mixture of two or more.

Further, for the purpose of improving ink absorbability,
Preferably, in the hydrophilic polymer, a polymer of a cationic monomer such as a monomer having a tertiary amino group or a tertiary amino group, a monomer capable of forming a quaternary ammonium base or a quaternary ammonium base, A cationic monomer and a crosslinking monomer and / or
Alternatively, the ink receiving layer may be formed by combining a cationic polymer such as a copolymer obtained by polymerizing a hydrophilic monomer or a cationic emulsion containing a cationic polymer. As the crosslinkable monomer, a monomer having a self-crosslinkable or reactive functional group, for example, an epoxy group-containing monomer,
Examples include a methylol group-containing monomer or a derivative thereof, a monomer containing a silyl group or the like having a hydrolytic condensation property, and an azirinyl group-containing monomer. Examples of the hydrophilic monomer include a carboxyl group-containing monomer, a half-ester of an unsaturated polycarboxylic acid or its anhydride and a linear or branched alcohol, a hydroxyl group-containing monomer, and an amide group-containing monomer. Sulfonic acid group-containing monomers, ether bond-containing monomers, polyoxyalkylene unit-containing monomers, and the like. In addition to the above-mentioned monomers, in order to adjust the film formability and physical properties of the image receiving layer, alkyl esters such as (meth) acrylic acid (C ₁ -C ₁₈ ) alkyl esters, cycloalkyl esters,
Nonionic monomers such as aryl esters, aralkyl esters, aromatic vinyls, vinyl esters, allyl esters, halogen-containing monomers, vinyl cyanide, and olefins can be used in combination. The mixing ratio of each of the above monomers can be appropriately set according to the monomers used, the desired physical properties of the ink receiving layer, and the like. Further, two or more of the above monomers may be used in combination.

The image receiving layer is made of silica, alumina, quartz powder, clay, talc, zinc oxide, titanium oxide, calcium carbonate, magnesium carbonate, barium sulfate, aluminum silicate, synthetic zeolite for the purpose of improving the durability of the formed image. Inorganic particles such as amino resin, polyethylene resin, polystyrene resin, acrylic resin, methacrylic resin, urea resin, melamine resin, polyamide resin, penzoguanamide resin, silicone resin, crosslinked or non-crosslinked fine particles of fluororesin, etc. A lubricant such as organic particles such as fine particles may be contained.

Further, in the image receiving layer, a curing agent, a curing accelerator, a coloring component such as a pigment or a dye, an antifoaming agent, a coating improver, a thickener, Agent,
Other components such as an antistatic agent can be blended.

The thickness of the image receiving layer is not particularly limited, and can be appropriately set according to the kind of the material constituting the image receiving layer, the target image forming method, the desired physical properties, the use and the like. When the image forming method for is an inkjet recording method, the thickness is preferably 10 to 15 μm.

The method for forming the image receiving layer is not particularly limited and can be appropriately set according to the kind of the material constituting the image receiving layer. For example, in the case of the ink receiving layer for the ink jet recording system as described above, the constituent components Are mixed using a solvent as necessary, and a method of drying after coating on a base material is used. As described above, when the image receiving layer is made of a resin containing a hydrophilic polymer as described above, a hydrophilic solvent in which water or alcohol is used alone, or a mixture thereof is used. As a coating method, a generally used method such as roll coating, air knife coating, blade coating, rod coating, bar coating and the like can be used.

On the surface of the image receiving layer, another layer such as a protective layer may be further formed as long as the function of the present invention is not impaired.

In the present invention, the surface of the foamed molded layer formed by foaming an acrylic resin is cut and / or removed by cutting to form the surface of the sucker layer, and the foamed molded layer is formed on the surface of the sucker layer. A plurality of air bubbles formed inside are cut, and the inner surface of the air bubbles is formed so as to communicate with the surface of the suction cup layer to form a fine suction cup.

The acrylic resin constituting the suction cup layer is:
The monomer component, molecular weight, polymerization state, and the like of the foamed molded layer are not particularly limited as long as the bubbles in the cut foamed molded layer can have a sucker function. The acrylic resin may contain a rubber component, and may further contain other components such as additives as long as the effects of the present invention are not impaired.

In the foam molding layer for forming the suction cup layer, the diameter of the bubbles forming the fine suction cups may be appropriately set according to the desired adsorptivity of the suction cup layer, but at least the surface of the suction cup layer is formed. The diameter of the bubbles in the portion is preferably 20 to 200 μm. If the size of the bubbles is out of the above range, the adsorptivity of the suction cup layer decreases.

As the method for forming the foamed molded layer for forming the suction cup layer, a general resin foaming method can be used, and examples thereof include hydrocarbons, halogenated hydrocarbons, ethers, ketones, and carbonates. A method using a volatile foaming agent such as a gas or a nitrogen gas, a decomposable foaming agent such as an alkali metal carbonate, a hydrogencarbonate of an alkali metal, an azo compound, a sulfonyl hydrazide compound, a semicarbazide compound, a nitroso compound, and an azide compound may be used. . Further, a nucleating agent or the like may be used. In addition, the expansion ratio can be appropriately set according to the diameter of the bubble according to the desired adsorptivity.

As a method of forming the suction cup layer, an acrylic resin is applied and foamed on a flat surface to form a foam molding layer, and then, before or after cutting and / or cutting, the foam molding layer is peeled off to form a suction cup layer. Is formed separately from the base material and laminated on the surface opposite to the image receiving layer forming surface of the base material, or an acrylic resin is applied and foamed on a sheet-like member separate from the base material to form a foam molding layer. Forming a suction cup layer separately from the substrate by cutting and / or cutting the surface of the foam molding layer, and laminating the sheet member together with the sheet member on the surface of the substrate opposite to the image receiving layer forming surface. Preferably, a method of directly applying and foaming an acrylic resin on one surface of the substrate to form a foamed layer, and cutting and / or cutting the surface of the foamed layer is preferred.

The adsorption laminate of the present invention can form an image such as a character, a symbol, a coloring, or a pattern on the surface of the image receiving layer by using various image forming methods. By forming the image receiving layer according to the target image forming method, a clear and high-resolution image can be obtained. The image forming method using the adsorption laminate of the present invention as a recording medium is not particularly limited,
For example, an image forming method such as an ink jet recording method, an electrostatic recording method using a laser printer, a thermal recording method, a thermal transfer recording method such as a sublimation type thermal transfer recording method using a thermal printer, etc., offset printing, gravure printing, and silk printing. Examples include an image forming method by various printings such as screen printing, and a method of forming an image with a writing implement such as a pen using an aqueous ink or an oily ink.

The adsorptive laminate of the present invention can be used for various applications which require an image to be formed on an image receiving layer and need to be repeatedly peeled off.
It is suitable as a label for forming a sticker or the like.

Hereinafter, the present invention will be described in more detail with reference to Test Examples and Examples, but the present invention is not limited thereto. Test example Test Method (1) Adsorption Strength (Adhesion Strength in Comparative Example 1) The laminates of Example 1 and Comparative Example 1 were cut to form a 25 mm-wide strip sample, and the sample was applied to a smooth glass surface. After sticking, the 180-degree peel strength was measured according to JIS C2107 4.3, and this was taken as the adsorption strength (the adhesive strength of the sample of Comparative Example 1).

(2) Durability to Peeling The laminated body of Example 1 and Comparative Example 1 was placed on a smooth glass surface by 50%.
After repeating the application and peeling repeatedly, the adsorption strength (the adhesive strength in Comparative Example 1) was determined in the same manner as in the above test (1).
Was measured, and the adsorption strength before and after peeling (Comparative Example 1)
In the above, the change in the adhesive strength (the result of the above-mentioned test (1) before peeling) was evaluated according to the following criteria. : Change in adsorption strength before and after peeling was 10 g
×: Change in adsorption strength before and after peeling exceeds 10 g

(3) Image Formability On the surface of the image receiving layer of the laminate of Example 1 and the surface of the laminate of Comparative Example 1 opposite to the surface on which the adhesive layer is formed, an inkjet printer (Canon (Canon) is used as an image forming apparatus. Co., Ltd., BJ
F8500), using pure ink, cyan,
Perform solid printing of each color of magenta, yellow, black,
The state of image formation was visually evaluated according to the following criteria. : No fading or bleeding observed. ×: Fading or bleeding occurred.

2. Test Results Table 1 shows the results of the tests (1) to (3).

[0030]

Example 1 Formation of Image Receiving Layer A polyethylene terephthalate resin film (HSP74, manufactured by Teijin Limited) having a thickness of 50 μm was used as a base material, and the following components were mixed on one surface of the base material. Coating liquid (solvent:
(A hydrophilic solvent containing water and alcohol) was applied to a dry thickness of 10 μm, and dried at 80 ° C. for 3 minutes to form an image receiving layer. Structure of Image Receiving Layer Water-soluble resin: Modified polyvinyl alcohol (Nippon Gohsei Chemical Co., Ltd., Ecomaty W430) 79 parts Lubricant: polymethyl methacrylate (Sekisui Chemical Co., Ltd., NBX-20) 2 parts Binder resin, Additives 19 parts Total 100.0 parts

Formation of a sucker layer An acrylic resin is applied to a surface of the substrate on which the image receiving layer is formed, on the side opposite to the image receiving layer forming surface, while generating air bubbles by a foaming machine to form a foam molding layer. The surface of the foam molding layer was removed by cutting to obtain a suction cup layer having a thickness of 50 μm.
When the surface of the suction cup layer was observed using a scanning electron microscope, it was confirmed that a fine suction cup formed by partially cutting circular bubbles having a diameter of 20 to 120 μm was formed.

Comparative Example 1 A laminate (Takorapiro J, manufactured by Kimoto Co., Ltd.) having a polyethylene terephthalate-based resin film as a base material and having an adhesive layer made of an adhesive applied in a mesh on one surface was used as a comparative example.

[0033]

[Table 1]

[0034]

The adsorbent laminate of the present invention has a sucker layer instead of an adhesive layer, whereby a member for sticking such as an adhesive is transferred to a sticking object, and the sticking strength is reduced. No sticking or contamination of the object to be stuck, and a high sticking strength (adsorption strength) can be maintained for a long time. Further, by having image receiving layers corresponding to various image forming methods, clear images such as characters and images can be formed. Therefore, it can be suitably used for various applications in which an image is formed on an image receiving layer and it needs to be repeatedly peeled off, especially for labels for forming advertisements, posters, stickers and the like to be displayed on glass surfaces of stores and the like. Furthermore, the suction cup in the present invention can be formed by a simple manufacturing method, and an adsorption laminate can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of the configuration of an adsorption laminate according to the present invention.

FIG. 2 (a) is a cross-sectional view showing a state of a foam molded layer obtained by foaming an acrylic resin, and FIG. 2 (b) is a state in which the surface of the foam molded layer is cut to form a suction cup layer FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Suction layer 3 Image receiving layer 4 Foam molding layer 5 Bubbles 6 Micro suction cup

Claims (7)

[Claims] 1. A laminate having a sucker layer on one surface of a substrate and an image receiving layer for forming an image on the other surface of the substrate, wherein the sucker layer is made of an acrylic resin. The surface of the foam molded layer formed by foaming is cut and / or removed by cutting to form a suction cup surface, and a plurality of bubbles formed inside the foam molding layer on the suction cup surface are cut off,
An adsorbed laminate characterized in that the inner surface of the bubble communicates with the surface of the suction layer to form a fine suction cup. 2. The adsorptive laminate according to claim 1, wherein the diameter of the bubbles forming the fine suction cups in the suction cup layer is 20 to 200 μm. 3. The adsorption laminate according to claim 1, wherein the substrate is a film made of a synthetic resin. 4. The adsorption laminate according to claim 3, wherein the substrate is a polyethylene terephthalate resin film. 5. The adsorptive laminate according to claim 1, wherein the image receiving layer contains a hydrophilic polymer. 6. The suction cup, wherein an acrylic resin is directly applied and foamed on one surface of the base material to form a foamed molded layer, and the surface of the foamed molded layer is removed by cutting and / or cutting. The adsorption laminate according to any one of claims 1 to 5, wherein a surface of the suction layer is formed. 7. The adsorption laminate according to claim 1, which is used for labels.