JP2008231215A - Self-adhesive sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-adhesive sheet excellent in suitability for writing and erasing, neatly applied without air entrainment even when it is a large-size sheet, resistant to the formation of fold wrinkles and curling tendency, and desirably usable as a white board. <P>SOLUTION: The self-adhesive sheet 1c is prepared by forming a white board film 3 on the top surface of a polyester spunbonded nonwoven fabric 2, forming a self-adhesive layer 4 on the back surface of the nonwoven fabric 2 through an extruded polyethylene layer 5 and integrally laminating them, can be stuck to the wall of an office, a partition, or any place else through the self-adhesive layer 4, and can be used as a white board with a white board film on which writing with a marker pen or the like is possible and from which the writing can be erased. When the white board is one in which the white board film is provided with a matt surface-coating layer, it becomes a more excellent one suitable as a projector screen because the reflection of illumination light can be inhibited. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer on the back surface, and more particularly to a pressure-sensitive adhesive sheet that can be used as a whiteboard by being attached to a wall or partition of an office or the like through the pressure-sensitive adhesive layer.

  Conventionally, a whiteboard has been used as a device that can arbitrarily write a schedule or the like in an office or the like. As a white board, a self-supporting type with legs has been used for a long time, but in recent years, various types of film or sheet type white boards to be used by being attached to office walls or partitions have been proposed and marketed. Such a sheet-type whiteboard can be used by sticking it when necessary, and can be easily re-used in another place, and has the advantage of not taking up space for storage. Yes, its needs are increasing.

  As an example of such a sheet type whiteboard, there is one that laminates a magnetic sheet and attracts it by magnetic force, but the place to stick is limited to an iron plate etc., the magnet sheet is heavy and large size There are disadvantages such as being difficult to carry and handle and expensive in price.

In view of this, an adhesive that has been subjected to adhesive processing on the back surface of the sheet and is attached to a wall or partition via the adhesive layer has become widespread. Such an adhesive sheet type whiteboard is disclosed in, for example, Patent Document 1 below. The pressure-sensitive adhesive sheet described in Patent Document 1 is formed by sticking a polyester or polyethylene film sheet on one surface of a paper as a base material and sequentially laminating an adhesive resin layer and a release paper on the other surface. In use, a film sheet is used as a white board by sticking it to an arbitrary place through an adhesive resin layer exposed by peeling off the release paper. Since the adhesive resin layer can be used by repeatedly peeling and bonding, it can be replaced with another place.
JP 2005-087441 A

However, the conventional adhesive sheet type whiteboards including those described in Patent Document 1 have the following disadvantages.
(1) When a large sheet is used, air is embraced and cannot be applied neatly.
(2) When paper is used as a base material, paper peeling (interlaminar peeling) is likely to occur and lacks durability.
(3) Office walls are often constructed by attaching panels, and there are steps and grooves in the joints between the panels. If an attempt is made to attach a large sheet across adjacent panels on such a wall, the whiteboard's ability to write and erase is greatly impaired at the joints of the panels.
(4) Folds tend to enter when handling sheets.
(5) When rolling up during storage or carrying, the adhesive layer must be protected by attaching a release paper (separator) to the adhesive layer, which is troublesome and wastes environmental resources.

  Therefore, the problem to be solved by the present invention is to provide a new pressure-sensitive adhesive sheet type white board which has solved these disadvantages of the prior art.

  In order to solve this problem, the present invention provides a pressure-sensitive adhesive sheet in which a whiteboard film is provided on the surface side of a nonwoven fabric having irregularities formed on one side or both sides, and a pressure-sensitive adhesive layer is provided on the back side of the nonwoven fabric and laminated and integrated. is there.

  It is preferable to use a nonwoven fabric manufactured by a spunbond method. In the spunbond method, a heat-smelted synthetic resin is extruded from a nozzle and drawn into endless long fibers, which are superposed on a belt conveyor to form a web, and then thermocompression-bonded with an embossing roll to obtain a nonwoven sheet. The final product is embossed (uneven) by an embossing roll.

  Polypropylene, polyester, polyethylene, nylon (trade name) and the like can be used as the synthetic resin for the spunbonded nonwoven fabric, but polyester is preferred from the viewpoint of dimensional stability. As the polyester spunbond nonwoven fabric, commercially available products such as “ELTAS (registered trademark)” manufactured by Asahi Kasei Fiber Co., Ltd. and “MARIX (registered trademark)” manufactured by Unitika Ltd. can be used.

Basis weight of the spunbonded nonwoven ^{fabric, 10g / m 2 ~100g / m} 2, preferably ^{15g / m 2 ~70g / m 2} , more preferably from ^{20g / m 2 ~50g / m 2} . When the weight per unit area is less than this, cushioning properties cannot be obtained, writing ability as a white board is lacking, and air removal effect when pasted on a wall or the like cannot be obtained. If the basis weight is larger than this, the texture becomes stiff and it is economically useless.

  The whiteboard film can be a polypropylene film or PET film with a thickness of 25 μm to 200 μm, but it can be used as it is with a whiteboard marker pen. Those provided with a construction layer are preferred. As such a white board film, a white board film “WBW-E125 (trade name)” manufactured by Dynic Co., Ltd., which uses a milk white biaxially stretched PET film having a thickness of 125 μm as a base film, can be suitably used.

  Since the surface of the whiteboard film coating layer is formed in a rugged shape to create a matte (matte) type, reflection of illumination light such as fluorescent lamps is prevented, making it suitable as a projector screen. It can be combined. As a whiteboard film provided with such a mat type coating layer, a screen film “HCM-” having a whiteboard function made by Dynic Co., Ltd., which uses a 125 μm thick milky white biaxially stretched PET film as a base film. “EW125 (trade name)” can be preferably used.

  The adhesive layer may be made of any material as long as it can be repeatedly peeled and adhered, but preferably a hydrogenated styrene / butadiene copolymer is used. The adhesive layer made of hydrogenated styrene / butadiene copolymer has no adhesive residue even if it is peeled off after being attached to a wall, etc., and can be applied anywhere regardless of the material as long as it is a smooth surface. Even if it gets dirty, it can be reused by washing with water, and because it does not block the opposite film surface, it can be stored without using a separator and has properties such as environmental friendliness. It is suitable as the pressure-sensitive adhesive layer of the present invention to be repeated.

  The adhesive layer may be provided directly on the back side of the nonwoven fabric, but there is a risk that the adhesive will penetrate into the nonwoven fabric and the adhesive layer will not be formed cleanly. In order to prevent this, a thin synthetic resin layer can be provided on the back side of the nonwoven fabric, and an adhesive layer can be provided by interposing this synthetic resin layer. The synthetic resin layer is preferably a thin film layer of polyethylene or polypropylene, for example, and these resins are heat-melted and applied by extrusion from a nozzle such as a T die. Since the heat-melted synthetic resin is cooled and thickened on the nonwoven fabric surface, a thin synthetic resin layer is formed without penetrating into the nonwoven fabric. If the synthetic resin layer is too thin, the effect of penetrating the adhesive of the adhesive layer will not be sufficiently exerted, and if it is too thick, the action of embossing the nonwoven fabric (air bleeding when pasted on a wall or the like) will be impaired, so 10-30 μm It is preferable to set the thickness to an extent.

  The pressure-sensitive adhesive sheet according to the present invention is obtained by providing a whiteboard film on the surface side of a nonwoven fabric having unevenness formed on one side or both sides, and providing a pressure-sensitive adhesive layer on the back side of the nonwoven fabric so as to be laminated and integrated. Similar to the adhesive sheet type whiteboard, it can be pasted anywhere, regardless of the location to be pasted, and it is easy to replace it with another place. In addition, since it is lighter than a magnet sheet or the like, it is easy to handle and inexpensive.

  In addition, since the pressure-sensitive adhesive sheet according to the present invention uses a nonwoven fabric with irregularities formed on one or both sides as a base material, it gives an appropriate cushioning property and also follows the joints of the panel, etc. -Excellent erasability.

  In addition, the unevenness formed on one or both sides of the nonwoven fabric also affects the adhesive surface of the adhesive layer, and when this adhesive sheet is attached, air can be easily removed from the unevenness of the adhesive surface, and a large sheet Even so, it can be neatly pasted.

  When hydrogenated styrene / butadiene copolymer is used for the adhesive layer, there will be no adhesive residue on the panel surface, no matter where it will be applied, and dirt on the adhesive surface even if it is peeled off after being applied to the panel for a long time. Since it has characteristics such that it can be removed by washing with water and reused, it is particularly suitable for the present invention in which peeling and adhesion are repeated.

  By interposing a synthetic resin layer having a thickness of 10 to 30 μm between the nonwoven fabric and the adhesive layer, the unevenness of the nonwoven fabric is affected by the adhesive surface of the adhesive layer, and the function of releasing air during pasting is maintained. In addition, the adhesion strength of the adhesive layer can be increased.

FIG. 1 is a cross-sectional view showing a pressure-sensitive adhesive sheet 1a according to an embodiment of the present invention, on the surface side of a polyester spunbond nonwoven fabric 2 (trade name ELTAS E01025, weight per unit area 25 g / m ² ) manufactured by Asahi Kasei Fibers Corporation. A whiteboard film 3 (product name: WBW-E125, manufactured by Dynic Co., Ltd., 130 μm thick) having a glossy surface coating layer 3 a is provided, and a hydrogenated styrene-butadiene copolymer ( An adhesive layer 4 made of JSR Dynalon (registered trademark) 1320P) is provided by hot melt extrusion from a T die so as to have a thickness of 25 μm, and is laminated and integrated. This pressure-sensitive adhesive sheet 1a can be attached to an office wall, partition, or any other location via the pressure-sensitive adhesive layer 4, and can be used as a whiteboard that can be written and erased with a marker on the surface of the whiteboard film 3. it can. Further, since the adhesive layer 4 can be repeatedly peeled and bonded, it can be pasted once and then replaced with another place. Moreover, since it can be rolled round without using a separator, it is convenient for storage and carrying.

FIG. 2 is a cross-sectional view showing a pressure-sensitive adhesive sheet 1b according to another embodiment of the present invention, on the surface side of a polyester spunbond nonwoven fabric 2 (trade name ELTAS E01025, basis weight 25 g / m ² ) manufactured by Asahi Kasei Fibers Corporation. A screen film 3 having a matte type surface coating layer 3b and having a whiteboard function (trade name HCM-EW125, manufactured by Dynic Co., Ltd., thickness 130 μm) is provided, and hydrogenation is performed on the back side of the spunbond nonwoven fabric 2. An adhesive layer 4 made of a styrene / butadiene copolymer (Dynalon (registered trademark) 1320P manufactured by JSR) is provided by a hot melt extrusion from a T die so as to have a thickness of 25 μm, and is laminated and integrated. This pressure-sensitive adhesive sheet 1b can be affixed to an office wall, partition, or any other location via the pressure-sensitive adhesive layer 4, and can be written / erased with a marker on the surface of the screen film 3 having a whiteboard function. Can be used as a board. Further, since the adhesive layer 4 can be repeatedly peeled and bonded, it can be pasted once and then replaced with another place. Moreover, since it can be rolled round without using a separator, it is convenient for storage and carrying. Furthermore, since it has the matte type surface coating layer 3b, the reflection of illumination light such as a fluorescent lamp is prevented, and it also has suitability as a projector screen.

  FIG. 3 is a cross-sectional view showing a pressure-sensitive adhesive sheet 1c according to still another embodiment of the present invention, in which a pressure-sensitive adhesive layer 4 is provided on the back side of a polyester spunbond nonwoven fabric 2 with a polyethylene extruded layer 5 (thickness 15 μm) interposed therebetween. ing. The PE extruded layer 5 has good adhesion to the polyester spunbonded nonwoven fabric 2 and prevents the pressure-sensitive adhesive of the pressure-sensitive adhesive layer 4 from penetrating, so that the adhesive strength of the pressure-sensitive adhesive layer 4 is also increased and integrated as a pressure-sensitive adhesive sheet 1c. The laminated structure can be maintained for a long time. This pressure-sensitive adhesive sheet 1c has the same configuration as that of the pressure-sensitive adhesive sheet 1a in FIG. 1 except that a polyethylene extruded layer 5 is interposed, and therefore the function and effect thereof are the same as those described above for the pressure-sensitive adhesive sheet 1a in FIG. . In addition, although not shown in figure, it was set as the structure which provided the adhesion layer 4 in the adhesive sheet 1b of FIG. 2 by interposing the polyethylene extrusion layer 5 (thickness 15 micrometers) on the back surface side of the polyester spunbond nonwoven fabric 2 similarly to FIG. Those are also embodiments within the scope of the present invention.

  FIG. 4 is a laminated sectional view showing a pressure-sensitive adhesive sheet 1d according to still another embodiment of the present invention, and a polyester spunbond nonwoven fabric 2 dyed in black is used. When characters written on the whiteboard film with a marker pen are erased with the eraser, the eraser scraped off will adhere and the eraser will become dirty.When this eraser is returned to the whiteboard film, the eraser attached to the eraser The residue stains the edge of the adhesive sheet and becomes unsightly. If the non-woven fabric 2 is dyed black in advance as in the embodiment of FIG. 4, the dirt can be made inconspicuous even if the erased residue adheres to the edge surface of the adhesive sheet 1 d. In addition, there is also an effect of hiding patterns and steps such as a wall surface on which the adhesive sheet 1d is affixed. 4 is an embodiment using a black dyed nonwoven fabric 2 in the pressure-sensitive adhesive sheet 1a of FIG. 1, but a black dyed nonwoven fabric 2 in the pressure-sensitive adhesive sheets 1b and 1c of FIGS. What has been configured is also an embodiment within the scope of the present invention.

It is a lamination sectional view showing an adhesive sheet by a suitable one embodiment of the present invention. It is a lamination sectional view showing the adhesive sheet by another embodiment of the present invention. It is a lamination sectional view showing the pressure sensitive adhesive sheet by another embodiment of the present invention. It is a lamination sectional view showing the pressure sensitive adhesive sheet by another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b, 1c, 1d Adhesive sheet 2 Polyester spunbond nonwoven fabric 3 White board film 3a Glossy type surface coating layer 3b Matte type surface coating layer 4 Adhesive layer 5 Polyethylene extrusion layer

Claims (5)

A pressure-sensitive adhesive sheet in which a white board film is provided on the surface side of a nonwoven fabric having irregularities formed on one side or both sides, and a pressure-sensitive adhesive layer is provided on the back side of the nonwoven fabric and laminated and integrated. The pressure-sensitive adhesive sheet according to claim 1, wherein the nonwoven fabric is produced by a spunbond method. The pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive layer is made of a hydrogenated styrene / butadiene copolymer. The pressure-sensitive adhesive sheet according to claim 1, wherein a synthetic resin layer is interposed between the nonwoven fabric and the pressure-sensitive adhesive layer. The pressure-sensitive adhesive sheet according to claim 1, wherein the nonwoven fabric is dyed black.

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