JP2987934B2 - Display materials - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a display material composed of a display object sheet and a backing film.

BACKGROUND ART A display material in which a display sheet is adhered to the surface of a backing film made of a polyvinyl chloride film via an adhesive layer, and a protective backing is adhered to the back surface of the backing film is known. -113866 gazette). Since the polyvinyl chloride film has excellent triboelectric properties, the polyvinyl chloride film to which the display material sheet is adhered is removed from the protective backing, and the polyvinyl chloride film is triboelectrically charged. Can be electrostatically adsorbed on a solid surface such as paper or glass.

By the way, in the conventional device as described above, when the display material sheet is adhered to the charged polyvinyl chloride film and left for a long time, the electrostatic attraction force of the polyvinyl chloride film is significantly reduced over time, It has been found that there is a problem that the polyvinyl chloride film and the display sheet are easily peeled off.

DISCLOSURE OF THE INVENTION The inventor of the present invention has made intensive studies on the reason why the electrostatic attraction force of a backing film to which a display object sheet is adhered decreases with the passage of time. The agent migrated to the backing film with the passage of time, and it was found that this caused a decrease in the electrostatic attraction force of the backing film, thereby completing the present invention.

According to the present invention, there is provided a display material comprising a display sheet having an electrostatically adsorbable plastic film and an adhesive layer containing no plasticizer and softener on the back surface.

Further, according to the present invention, there is provided a display material comprising a display sheet having an electrostatically adsorbable plastic film and a self-adhesive resin layer on the back surface.

Further, according to the present invention, there is provided a display material comprising a display sheet having an electrostatically adsorbable plastic film and a self-adhesive foamed resin layer on the back surface.

The backing film used in the present invention is made of an electrostatically adsorbing plastic film, and includes a triboelectrically charging plastic film and an electretized plastic film. As the triboelectric charging plastic film, a conventionally known plastic film having a high insulating property is used, and specific examples thereof include a polyvinyl chloride film, a vinylidene chloride resin film, a polystyrene film, a fluorinated ethylene, and a propylene copolymer film. And a polypropylene film. The plastic film formed into an ejectlet can be obtained by applying a high voltage to the plastic film by corona discharge according to a conventional method, and is a plastic film capable of semi-permanently retaining charges. In contrast to the above-mentioned triboelectrically-chargeable plastic film which is liable to attenuate the electrostatic attraction force, the electretized plastic film is a plastic film which is much more excellent in charge retention and stability, and which is hard to attenuate the electrostatic attraction force. is there. As a plastic film for electretization, polyvinylidene fluoride film, fluorinated ethylene, propylene copolymer film, polypropylene film, polyester film, polymethylpentene film, etc. are used, and a high charge property such as polyvinyl chloride film is used. Electret plastic film may be used. As the above-described triboelectric plastic film and the plastic film for electret formation, those having high insulating properties which do not contain a plasticizer and an antistatic agent are preferably used. The surface resistance of these plastic films is usually at least 10 ¹³ ohms, especially at least 10 ¹⁵ ohms.

The display material sheet used in the present invention has, on its back surface, an adhesive layer that can be peelably or non-peelably bonded to the backing film,
It has a self-adhesive resin layer or a self-adhesive foamed resin layer on the back surface. The display sheet may be paper, a plastic film, a foam sheet, a cloth, or the like. In addition, other films can be laminated and adhered to the surface of the display material sheet as necessary.For example, when the display material sheet is paper, a plastic film is used, and when the display material sheet is a plastic film, paper is used. It can be laminated and bonded.

The adhesive layer formed on the back surface of the display sheet used in the present invention is required to be an adhesive layer containing no plasticizer and softener in order to prevent a decrease in the electrostatic attraction force of the backing film. is there. In the study of the present inventor, a display material sheet formed by applying an adhesive containing a plasticizer or a softener such as a rubber-based adhesive or a rubber-based solvent-type adhesive generally used as an adhesive to the back surface is used. After about 10 days, the chargeability of the backing film with electrostatic attraction decreases, and the electrostatic attraction decreases significantly after about 10 days. Was found to work. This is because plasticizers and softeners in the adhesive migrate into the electrostatically adsorbing plastic film, causing the film to deteriorate, which significantly reduces the electrostatic attraction force. Conceivable.
Such an inconvenience does not occur at all in a display sheet having an adhesive layer containing no plasticizer or softener used in the present invention.

Non-plasticizer-based or non-softener-based adhesive used in the present invention, in addition to ordinary adhesives, include pressure-sensitive adhesives,
The adhesive layer may or may not have releasability from the backing film. Examples of such an adhesive include an acrylic adhesive, a water-based adhesive, a liquid curable adhesive, and a polyurethane adhesive. For the polyurethane-based pressure-sensitive adhesive, for example, a mixture of 100 parts by weight of a polyol (eg, polyether polyol) and 40 parts by weight of a polyisocyanate (eg, tolylene diisocyanate) is heated at 100 ° C. for about 15 minutes. Can be obtained by: Similarly, the display sheet having the self-adhesive resin layer or the self-adhesive foamed resin layer does not cause the above-described inconvenience.

The self-adhesive resin is an adhesive having a re-peeling property utilizing the adhesive force or adhesive force of the resin itself, and does not contain a plasticizer or a softener, and thus can be preferably used in the present invention. As the adhesive composed of this self-adhesive resin, an ethylene-vinyl acetate copolymer sold under the trade name "NK-ONETAK" by Nippon Kaishi Paper Co., Ltd. can be preferably used.

The self-adhesive foamed resin is a sheet-shaped foamed resin having a large number of micropores on its surface, and has adhesiveness or adhesion to a smooth surface due to the micropores. This can also be preferably used in the present invention because it does not alter the mount film and does not exhibit the effect of reducing its electrostatic attraction force. As this self-adhesive foamed resin, a resin containing a mixture of a urethane resin and an acrylic resin or a butadiene-based synthetic rubber as a base resin is described in Japanese Patent Application Laid-Open No. 1-259043. Co., Ltd., trade name "Papiral B-001L"
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The display material of the present invention comprising the display sheet and the electrostatically adhering backing film is allowed to stand naturally for 3 months in a state where the display sheet and the backing film are adhered to each other, and the electrostatic adsorption of the backing film. Examination of the change with time of the force revealed that the electrostatic attraction force did not significantly decrease.

The display material of the present invention provides a display material sheet, a raw film having an adhesive layer, a self-adhesive resin layer or a self-adhesive foamed resin layer on the back surface, and a base film, which gives a base film, It can be manufactured by laminating and bonding through the adhesive layer, the self-adhesive resin layer or the self-adhesive foamed resin layer, and punching this into a required shape. In this case, if necessary, a backing film for providing a protective film made of paper or a plastic film is provided on the back surface of the backing film for providing the backing film, and the electrostatic attraction of the backing film for providing the backing film is utilized. In this state, a punching process can be performed together with an original film that provides a protective film. In this way, a display material in which the display object sheet is laminated on the surface of the backing film and the protective film is laminated on the back surface of the backing film is obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing the structure of a display material according to the present invention.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a backing film, 2 denotes a display sheet, and an adhesive layer, a self-adhesive resin layer or a self-adhesive foamed resin layer 3 between the backing film 1 and the display sheet 2
Adhered by The display material sheet 2 can be preliminarily printed with characters, pictures, designs, etc. on the surface thereof, and the surface of the display material sheet 2 is left blank without printing, and appropriate characters, pictures, designs, etc. are provided by the user side. May be described.

The display material of the present invention can be electrostatically adsorbed to a solid surface such as glass, plastic, or paper through the mount film 1 because the mount film 1 has an electrostatic attraction property. Further, the display object sheet 2 is peeled off from the backing film 1 as necessary, and is passed through an adhesive layer, a self-adhesive resin layer or a self-adhesive resin layer 3 formed on the back surface of the display object sheet 2. It can be adhered to various solid surfaces, and if necessary, it can be peeled off from the solid surface and adhered to the backing film 1 again.

In the display material using the display sheet having the adhesive layer of the present invention, a release agent such as silicone is applied to the surface of the backing film 1 on the side to which the display sheet 2 is adhered, and the backing sheet of the display sheet is provided. Peeling from the film can be facilitated.

When a polyolefin resin film or a vinyl chloride / vinyl acetate copolymer film is used as the backing film 1 and a paper or polyvinyl chloride film is used as the display sheet 2, the above-mentioned release agent is not applied onto the backing film. Even so, the display object sheet can be easily peeled from the backing film.

The display material of the present invention can be adhered (electrostatically adsorbed) to various smooth solid surfaces such as paper, plastic, and glass by utilizing the electrostatic adsorbing property of the backing film. In this case, since the adhesive force to the solid surface is not due to the adhesive but due to the electrostatic attraction, the display material can be freely moved and peeled on the solid surface, and the solid surface can be removed. Does not cause any pollution and damage. Also,
In the display material of the present invention, if necessary, an adhesive layer formed so that the display object sheet can be peeled off from the back surface thereof,
A self-adhesive resin layer or a self-adhesive foamed resin layer can be used to firmly adhere to a solid surface.

In the display material of the present invention, the display object sheet on the backing film, even if left for a long time in a state where the adhesive layer, self-adhesive resin layer or self-adhesive foamed resin layer is adhered, The electrostatic attraction force of the backing film does not suddenly decrease.

The display material of the present invention is obtained by printing required characters, pictures, figures, codes, and the like on the display object sheet, and is used for applications such as advertising media and learning materials.

Claims (6)

(57) [Claims] 1. A display material comprising an electrostatically adsorbable plastic film and a display sheet having an adhesive layer containing no plasticizer and softener on the back surface. 2. A display material comprising an electrostatically adsorbable plastic film and a display sheet having a self-adhesive resin layer on the back surface. 3. A display material comprising a static adsorbing plastic film and a display sheet having a self-adhesive foamed resin layer on the back surface. 4. The method according to claim 1, wherein said electrostatically adsorbable plastic film is a frictionally chargeable plastic film.
Any display material. 5. The display material according to claim 1, wherein said electrostatically adsorbable plastic film is an electretized plastic film. 6. The display material according to claim 1, wherein said adhesive layer is formed so as to be peelable from an electrostatically adsorbable plastic film using a pressure-sensitive adhesive.