JP3018714U - Weak adhesive film - Google Patents

Abstract

(57) [Summary] [Purpose] When a weak adhesive film is attached to a mirror surface such as a glass surface or a plated surface by providing a predetermined groove or hole in the weak adhesive layer, its appearance is irregular due to the intake of air. A weak adhesive film that does not impair [Structure] A weak adhesive layer 2 having grid-shaped grooves 2a is formed on a film substrate 1 by, for example, screen printing, and a separator 3 is laid on the weak adhesive layer 2. The adhesive strength of the weak adhesive layer is 50 g / 2 as measured by JIS-Z0237.
The width is 5 mm or less. The ratio of the area of the groove to the area of one side of the film substrate is 70% or less. The resulting weak adhesive film is printed / cut, used as a label, or by using the appropriately colored or metal-deposited film substrate 1,
Used as a light-shielding film. Further, another weak adhesive layer may be formed on the back surface of the film substrate 1, and both surfaces of the weak adhesive film may be used as a label or the like that can be attached to the mirror surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a weak adhesive film, particularly when it is attached to a mirror surface such as a glass surface or a plated surface, and can be attached without irregular intake of air between them, which impairs the aesthetic appearance. There is no weak adhesive film.

[0002]

[Prior art]

 A one-tack type weak adhesive film for sticking to a mirror surface such as a glass surface or a plated surface, when attached directly to an adherend, causes irregular air intake (air trapping) between them and is especially transparent or transparent. In the case of a semi-transparent weak adhesive film, or when viewed from the back of the glass when it is attached to the glass, the irregular pattern of the air taken in can be visually observed, and its aesthetic appearance is significantly impaired. In order to avoid this, it was necessary to apply water to the mirror surface, and then carefully apply a weak adhesive film to it over the time, and perform a water application operation.

[0003]

[Problems to be solved by the device]

 The present invention provides a weak pressure-sensitive adhesive film that does not require such a water-pasting operation and can easily attach a label or the like to a mirror surface without impairing aesthetics by taking in air during attachment. To aim.

[0004]

[Means for Solving the Problems]

 The present invention includes a film substrate and a weak adhesive layer having an adhesive force formed on one surface thereof of 50 g / 25 mm width or less as measured by JIS-Z02 37, and the weak adhesive layer has a groove or a predetermined shape. The weak adhesive film is provided with pores, and the ratio of the area of the groove or the pores to the area of the one surface of the film substrate is 70% or less.

Hereinafter, the present invention will be described in detail. As the film substrate, any type of film substrate such as polyester, polyvinyl chloride, polyurethane, acetate plastic, polycarbonate, polyethylene and polypropylene can be used. The film base material is preferably transparent or translucent, but even if it is opaque such as a thin metal vapor-deposited film, the irregular air intake state at the time of application may be easily recognizable, and the glass substrate may be easily recognized. When it is attached to a child, it may be seen from the back side of the glass. In such a case, the present invention is effective. The film substrate may have any thickness as long as it is used for a conventional one-tack type weak adhesive film, and specifically, it is preferably 5 to 900 μm, more preferably 10 to 500 μm, and further preferably 15 to 100 μm.

The weak adhesive layer has a very small adhesive force, and a protective separator is not always necessary when it is attached by so-called “wetness”, but when it has an adhesive force to some extent, adhesion of dust etc. From the viewpoint of prevention, it is preferable to use a separator. As the separator, release paper treated with silicone or the like, various releasable plastic films, or polyolefin films such as polyethylene film, polypropylene film, polymethylpentene film and the like can be used.

The weak adhesive layer is generally formed on one surface of the film base material, but may be formed on both surfaces of the film base material. In the latter case, for example, when the weak adhesive film of the present invention is used as a label, at least a partial colored printing layer may be formed between the film substrate and one weak adhesive layer. By doing so, for example, it is convenient to attach the weak adhesive film to the surface of the glass plate on either side of the two weak adhesive layers so that the colored printing layer can be visually observed. If it sticks, dust or the like will not attach to the weak adhesive layer that was not used for sticking.

The adhesive force of the weak adhesive layer is a value of 50 g / 25 mm width or less as measured by JIS-Z0237, and even if this value is substantially 0 g / 25 mm width, by so-called “wetting”, It may adhere well to the adherend.

As a material for the weak adhesive layer, a resin or a rubber component is used, and when the resin itself does not have an appropriate weak adhesive property, an appropriate amount of a plasticizer is added. Usually, when a resin component is used, a plasticizer is often added, but in the case of a resin component or a rubber component having a remarkably low glass transition point, there is a case where the resin composition has an appropriate weak adhesive property without adding a plasticizer. . As the resin component, various alkyd resins, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-vinyl chloride copolymer, ethylene-acrylic acid ester copolymer, ethylene-ethyl acrylate- Maleic anhydride copolymers (specifically, for example, "Bondaine (trade name)" manufactured by Sumitomo Chemical Co., Ltd.), olefin copolymer resins, ethyl acrylate-butyl acrylate copolymer, butyl acrylate -Acrylic resins such as methyl acrylate copolymer, ethyl acrylate-butyl acrylate copolymer, butyl acrylate-methyl acrylate copolymer, ethyl acrylate-vinyl acetate copolymer, one-pack type thermoplastic aliphatic urethane resin Class [Specifically, for example, Chemicals Co., Ltd. “Resamine (trade name)” and Nippon Polyurethane Industry Co., Ltd. “Paraprene (trade name)”], various polyamide resins, vinyl acetate resins, ethyl silicone, butyl silicone, etc. Silicone-based resins [specific examples include, for example, "SE 5004 (trade name)" manufactured by Toray Dow Corning Co., Ltd., etc., and examples of the rubber component include natural rubber, SBR, chloroprene rubber, Examples thereof include acrylic rubber, NBR, butyl rubber, isoprene rubber, urethane rubber, ethylene-vinyl acetate copolymer rubber, silicone rubber and the like.

Examples of plasticizers include a wide variety of plasticizers such as phthalic acid ester-based, phosphoric acid ester-based, fatty acid ester-based, chlorine compound-based, epoxidized oil-based, polyester-based, and low-molecular-weight silicone-based plasticizers. Specific examples thereof include DOP, DBP, adipic acid butyl ester, phthalic acid ethyl ester, and liquid silicone. It goes without saying that which plasticizer and how much amount to use greatly differ depending on the type of resin / rubber component.

A leveling agent, an antifoaming agent, and various other additives may be added to the material of the weak adhesive layer.

The thickness of the weak pressure-sensitive adhesive layer varies depending on the type of the material and the like, but is preferably 5 to 900 μm, more preferably 7 to 500 μm, and further preferably 10 to 100 μm.

The shape of the grooves or holes of the self-adhesive layer is not particularly limited as long as it does not impair the aesthetic appearance, and it may be a groove, a circle, an ellipse, a polygon such as a lattice, a stripe, a spiral or a wave. It is possible to design holes, such as stars, donuts, etc., as well as various types of letters, patterns, or image-shaped grooves or holes, but in short, avoid irregular air intake (air trapping) when attaching. It is important to be able to achieve the object of the present invention, which eliminates the loss and does not spoil the appearance even when seeing through such grooves and holes. It is preferable that the weak adhesive film of the present invention is a continuous groove whose end is opened when the weak adhesive film of the present invention is used as a label or the like from the viewpoint of surely eliminating air entrapment. It usually absorbs enough and does not spoil the appearance.

The ratio of the area of the groove or void to the area of the surface of the film substrate on which the weak adhesive layer is formed is 70% or less, preferably 50% or less, more preferably 30% or less. If this ratio is too high, problems such as insufficient adhesion to the mirror surface of the adherend occur.

The method of forming the weak adhesive layer is a method of printing the material of the weak adhesive layer on the film substrate while forming the grooves and holes by gravure printing or screen printing, and a material of the weak adhesive layer. After coating with a coater on the film base material, pressure is applied to perform embossing, and a method of discharging the material of the weak adhesive layer into a predetermined shape with a hot melt applicator. It is preferable to stack a protective separator on the weak adhesive layer thus formed.

The weak pressure-sensitive adhesive film produced in this manner is printed / cut as required and used as a label to be stuck on a mirror surface such as a glass surface or a plated surface, or appropriately colored or It can be used as a light-shielding film or the like, which is produced by using a metal substrate on which a metal is vapor-deposited to produce a weak adhesive film and is attached to a glass window or the like.

[0017]

[Action]

 Since the weak adhesive film of the present invention has grooves or holes in the weak adhesive layer that do not impair the appearance, it does not take in air (adhesion of air) when it is attached to the adherend, and the appearance after attachment is good. Excellent in. Also, since the adhesive strength is weak, it is easy to peel off after sticking to the adherend, and there is no adhesive residue on the adherend, and it can be reused as many times as necessary. A double-sided type weak adhesive film having a weak adhesive layer on both sides is convenient because it can be attached on any side.

[0018]

【Example】

 Hereinafter, the present invention will be described more specifically by way of examples with reference to the drawings, but the present invention is not limited to the examples. It should be noted that each drawing is a conceptual diagram, and the dimensions and their ratios do not represent actual ones.

Example 1 100 parts by weight of polyvinyl chloride was dissolved in a suitable solvent (for example, cyclohexanone), and 100 parts by weight of DOP was added to adjust the viscosity to prepare a screen printing ink for a weak adhesive layer. Using a screen printing plate that gives this ink a grid-like printing surface (solid lines correspond to the grid-like grooves and constitutes the non-printing area) as shown in Fig. 1, a thickness of 25 μm as a film substrate. Screen-printing was performed on the transparent soft polyvinyl chloride film of No. 1 to form a weak adhesive layer having a thickness of about 15 μm, and a protective separator was placed on it to form a weak adhesive film as shown in FIG. In FIG. 2, 1 is a film substrate, 2 is a weak adhesive layer, 2a is a grid-like groove, and 3 is a protective separator. The adhesive strength of the adhesive of the weak adhesive layer was about 10 g / 25 mm width when measured in accordance with JIS-Z0237 with the above thickness.

It is possible to perform predetermined coloring printing on the film base material 1 of this weak adhesive film, cut it appropriately, and use it as a label.

Example 2 The weak adhesive film obtained in Example 1 was colored and printed on the film substrate 1, and the same screen printing ink for the weak adhesive layer as in Example 1 was further formed thereon. Similarly, screen printing was performed to form another weak adhesive layer, and a weak adhesive film as shown in FIG. 3 was prepared. In FIG. 3, 1 is a film substrate, 2 is a weak adhesive layer, 2a is a grid-like groove, 3 is a protective separator, 4 is a colored printing layer, and 5 is another weak adhesive layer. A protective separator may be further stacked on the weak adhesive layer 5. This weak adhesive film can be cut and used as a label.

[0022]

[Effect of device]

 Since the weak adhesive film of the present invention has grooves or holes in the weak adhesive layer that do not impair the appearance, it does not take in air (adhesion of air) when it is attached to the adherend, and the appearance after attachment is good. It can be used as a label to be attached to a mirror surface such as a glass surface or a plated surface such as a window of an automobile or a train, and can also be used as a light-shielding film by using a film substrate that is appropriately colored or metal-deposited. It can also be used. Also, since the adhesive strength is weak, it is easy to peel off after sticking to the adherend, and there is no adhesive residue on the adherend, and it can be reused as many times as necessary. Also, the double-sided type weak adhesive film, which has a weak adhesive layer on both sides, is convenient because it can be attached on any side.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a weak adhesive layer of a weak adhesive film of the present invention.

FIG. 2 is a sectional view showing an example of a weak adhesive film of the present invention.

FIG. 3 is a sectional view showing an example of a double-sided type weak adhesive film of the present invention.

[Explanation of symbols]

 1 Film Base Material 2 Weak Adhesive Layer 2a Groove 3 Separator 4 Colored Printing Layer 5 Weak Adhesive Layer

Claims (3)

[Scope of utility model registration request] 1. The film substrate and the adhesive strength formed on one surface thereof are 50 g / as measured by JIS-Z0237.
Including a weak adhesive layer having a width of 25 mm or less, the weak adhesive layer is provided with a groove or a hole having a predetermined shape, and the ratio of the area of the groove or the hole to the area of the one surface of the film substrate is 7
A weak adhesive film characterized by being 0% or less. 2. A weak adhesive layer having an adhesive force of not more than 50 g / 25 mm width as measured by JIS-Z0237 is formed on the other surface of the film substrate, and the weak adhesive layer also has grooves or voids of a predetermined shape. The weak pressure-sensitive adhesive film according to claim 1, wherein a hole is provided, and a ratio of an area of the groove or hole to an area of the other surface of the film substrate is 70% or less. 3. A colored printing layer is formed on at least a part of the other surface of the film substrate between the other surface of the film substrate and the weak adhesive layer formed thereon. The weak adhesive film according to claim 2, wherein