JPH07166139A - Tacky adhesive tape or sheet - Google Patents

Abstract

PURPOSE:To obtain a tacky adhesive tape or sheet uniformly coated with a tacky adhesive agent even in the case of applying only a small amount of the agent or using a tacky adhesive agent having low adhesive force by slicing a foamed synthetic resin, using the sliced foam material as the substrate and coating the sliced surface with a tacky adhesive agent. CONSTITUTION:This tacky adhesive tape or sheet is produced by slicing a foamed synthetic resin, using the sliced foam as a substrate 1 and coating the sliced surface 11 with a tacky adhesive agent 21 (preferably a water-soluble emulsion-type tacky adhesive having self-tackiness or weak tacky adhesivity such as a vinyl acetate-based tacky adhesive). It is preferable to use a foamed polyolefin resin having skin layers and produced by an extrusion foaming process as the foamed synthetic resin and using the skin layer 12 as the face opposite to the tacky adhesive layer 2 because the tacky adhesive tape having the above structure can be wound as it is in the form of a roll without causing strong adhesion of the adhesive layer to the lower substrate and easily peeled to be usable in expanded state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive tape or sheet having a synthetic resin foam as a base material.

[0002]

2. Description of the Related Art Adhesive tapes and sheets having a synthetic resin foam sheet as a base material are used for various construction materials by utilizing the characteristics of the foam material as a base material, such as cushioning property, heat insulating property and sound insulation property. It is used for various purposes as a packaging material and protective material for furniture, fittings, industrial materials and other articles.

As a base material for this type of adhesive tape or sheet, a relatively flexible synthetic resin foam sheet is used. Among them, a foam sheet formed by extrusion foaming a polyolefin resin such as polyethylene or polypropylene is used. It is generally used, and an adhesive is applied to one side of this foam.

As the pressure-sensitive adhesive, a strong pressure-sensitive adhesive having a relatively strong adhesive force to the surface of a package or an object to be protected, or an adhesive having a weak adhesive force to other articles but having adhesive layer surfaces adhered to each other. Various types of self-adhesive adhesives, pressure-sensitive adhesives, and slightly adhesive type adhesives, which have a relatively large force, are used depending on the application.

[0005]

However, the surface of the synthetic resin foam produced by extrusion foaming is not completely flat because it has a slight bulge of the cell membrane and is wavy in its entirety, and therefore it does not cover the entire surface. It is difficult to form a thin layer with a uniform thickness, and it is necessary to relatively increase the coating amount. Further, depending on the material of the foam, there are some that require some kind of coating property improvement treatment.

For example, a foamed material such as a polyolefin resin has a low affinity for the pressure-sensitive adhesive, and particularly when it has a skin layer on the surface, the pressure-sensitive adhesive does not ride well and coating unevenness easily occurs.
It is difficult to apply in thin layers.

Therefore, when a foamed material such as a polyolefin resin is used as a base material, it is intended to use it after corona discharge treatment to improve coatability, but a separate step for corona discharge treatment is required, The cost is also quite high. Moreover, it is said that the foam of the polyolefin resin is difficult to be subjected to corona discharge treatment as it becomes thinner, and it cannot be used unless it is a foam sheet having a considerable thickness of 2 mm or more. Cost reduction is considered difficult.

Further, although this kind of adhesive tape or sheet is wound in a roll shape, if it is wound as it is, the amount of the adhesive applied may be relatively large, and therefore it may be adhered to the other surface side. It becomes difficult to peel off easily, and the base material of the lower layer may be partially peeled off when peeling and developing.

Therefore, generally, release paper or release sheet is laminated on the pressure-sensitive adhesive layer, or the surface opposite to the pressure-sensitive adhesive layer is subjected to a release treatment with a silicone release material or the like and wound.

In this case, however, the use of the above-mentioned release paper or the like causes a high cost, and in the former case, the release paper or the like must be peeled off before use. It is inconvenient.

Further, depending on the use of an adhesive tape or sheet having a foam of this type as a base material, for example, when used as a packaging material or a protective material for building materials, the extent to which no adhesive remains on the surface of other articles However, in the case of a polyolefin-based resin foam having a skin layer, the one having relatively strong adhesiveness due to the problem of coatability of the adhesive as described above. Is common.

The present invention has been made in view of the above, and a first object thereof is to provide a base material of a synthetic resin foam,
Adhesive tape that can be applied evenly and evenly with a small coating amount, and even if the base material is a foam such as a polyolefin resin, can be applied without corona discharge treatment and can be manufactured at low cost. Or we are providing the seats.

Another object of the present invention is to apply a pressure sensitive adhesive in the same manner as described above, and to prevent a strong adhesion to the surface on the side opposite to the pressure sensitive adhesive layer. The purpose is to provide an adhesive tape or sheet that can be rolled up without application.

Still another object of the present invention is to provide a pressure-sensitive adhesive tape or sheet of a weak pressure-sensitive adhesive which can be easily peeled off after being used for adhesion to other articles.

[0015]

The first adhesive tape or sheet of the present invention for solving the above-mentioned problems is obtained by slicing a synthetic resin foam as a base material and applying an adhesive to the sliced surface. Characterize.

In the second aspect of the present invention, the pressure-sensitive adhesive tape or sheet is obtained by slicing a polyolefin resin foam having a skin layer as a base material, applying the pressure-sensitive adhesive to the sliced surface, and applying the pressure-sensitive adhesive to one side. It is characterized in that the layer and the other surface are skin layers.

As the above-mentioned pressure-sensitive adhesive, a water-soluble emulsion type pressure-sensitive adhesive is preferably used.

[0018]

According to the above-mentioned pressure-sensitive adhesive tape or sheet of the present invention, of course, due to the characteristics of the synthetic resin foam which is the base material, it is excellent in cushioning property, heat insulating property, sound insulation property, etc. Since the body is sliced and the adhesive is applied to the sliced surface, unlike the normal foam surface, the coatability of the adhesive can be improved, and even if the coating amount is not so large, the entire surface can be covered. The pressure-sensitive adhesive can be applied uniformly over the entire length, and a good pressure-sensitive adhesive layer can be formed in a thin layer.

That is, the sliced surface of the foam, which is the surface to which the adhesive is applied, is substantially flat as a whole without bubble swelling or wavy undulation peculiar to the surface of the foam due to cutting of bubbles. . Moreover, the flat sliced surface has innumerable minute recesses due to the cut bubbles on the entire surface, and the surface area is larger than that of a normal foam surface. Therefore, as a result of the adhesive applied to the sliced surface of the foam, a part of the adhesive enters the minute recesses and is held, and as a result, the adhesion of the adhesive improves as a whole.

Therefore, even if the base material is a foam such as a polyolefin resin, corona discharge treatment is not required,
Further, even if the coating amount is not so large, the pressure-sensitive adhesive can be uniformly coated over the entire surface, and a relatively thin pressure-sensitive adhesive layer can be formed without any problem.

In the pressure-sensitive adhesive layer applied and formed on the sliced surface as described above, since a part of the pressure-sensitive adhesive enters the minute concave portions to form minute unevenness, in a state where it is not strongly pressed,
The pressure-sensitive adhesive in the minute recesses does not contribute to the adhesive action, and therefore, the peeling development from the rolled state becomes relatively easy.

In particular, as in claim 2, a polyolefin resin foam having a skin layer is used as a substrate,
When the surface opposite to the pressure-sensitive adhesive layer formed by coating on the slice layer is used as the skin layer, the pressure-sensitive adhesive does not easily adhere to the surface of this skin layer, and even if it is wound into a roll as it is. Further, it can be easily peeled off and used without strongly adhering to the base material of the lower layer, and the use of release paper or the like and the release treatment can be eliminated.

Moreover, when the skin layer is strongly pressed during use, the pressure-sensitive adhesive in the minute recesses on the surface of the pressure-sensitive adhesive layer can also contribute to the adhesive action, and the minute recesses exert a sucker effect, resulting in weak tackiness. Even the pressure-sensitive adhesive of No. 1 has a strong adhesive force sufficient for use, while it can be peeled off relatively easily.

[0024]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of an adhesive tape or sheet (hereinafter referred to as an adhesive tape or the like) according to the present invention, and FIG. 2 is an enlarged sectional view of the same. (1) in the figure is a synthetic resin foam mainly having closed cells, which has appropriate flexibility.
For example, it is a base material obtained by slicing a polyolefin resin foam having a skin layer, (11) shows the slice surface, (12) shows the skin layer, and (2) is formed by coating on the slice surface (11). The adhesive layer is shown. The adhesive layer (2) is a relatively thin layer formed by applying the characteristics of the sliced surface (11) to a uniform thickness over the entire surface.

That is, as shown in a further enlarged view in FIG. 3, the slice surface (11) of the foam, which is the base material (1), is
The bubble film peculiar to the surface of the foam and the wavy undulation are eliminated and the surface is substantially flat as a whole. Moreover, the flat slice surface (11) is spread over the entire surface by cutting the bubbles. There are innumerable minute recesses (13), which makes the surface area larger than that of a normal foam surface.

Therefore, the adhesive (21) applied to the sliced surface (11) is securely held by entering into the minute recesses (13) existing innumerably on the entire surface, and also by the cut end surface of the bubble film. The convex portion is applied so that it is exposed on the outer surface. As a result, the adhesive property (coating property) as a whole is improved.

Therefore, even if the base material is a foam such as a polyolefin resin, corona discharge treatment is not required,
Even if the coating amount is not so large, the pressure-sensitive adhesive (21) can be uniformly applied over the entire surface, and the formation of a relatively thin pressure-sensitive adhesive layer (2) is possible without any problem.

As the synthetic resin foam used for the base material (1), a synthetic resin foam having appropriate flexibility, preferably a foam having closed cells can be used. A foam of a polyolefin-based resin having peelability and strength, particularly a foam having a skin layer (12) formed by extrusion foaming is preferably used.

Examples of the polyolefin resin foam include olefin homopolymers such as polyethylene, polypropylene and polybutene, olefin copolymers such as ethylene-propylene copolymer, ethylene-vinyl chloride copolymer and ethylene-styrene. Examples thereof include copolymers of olefins such as copolymers with other monomers. Further, the crosslinked foam has high strength and can be preferably used.

The thickness of the foam is usually 1 to 5 mm, though it varies depending on the size of the adhesive tape or the like and the application. Especially, since corona discharge treatment is not performed as described above, 1
It is also possible to carry out with a considerably thin wall of less than mm.

The surface of the polyolefin resin foam, in particular, the surface of the skin layer (12) is poor in the adhesion of the adhesive and usually requires corona discharge treatment. By applying the pressure-sensitive adhesive (21), the pressure-sensitive adhesive layer (2) having a uniform thickness can be applied and formed over the entire surface without corona discharge treatment.

Moreover, when the surface opposite to the pressure-sensitive adhesive layer (2) is the skin layer (12), the pressure-sensitive adhesive layer (2) hardly adheres to the skin layer (12) and is easily peeled off. For example, even when wound in a roll as shown in FIG. 1, another release paper or release sheet may be laid on the adhesive layer (2),
It is not necessary to apply a peeling treatment to the other surface, and it can be easily peeled off when used.

As the adhesive, for example, water component is 50
%, A water-soluble emulsion type pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive or a vinyl acetate-based pressure-sensitive adhesive having a solid content of 50%, among which a self-adhesive or weak-adhesive pressure-sensitive adhesive is preferably used.
This pressure-sensitive adhesive is preferably prepared by mixing and adjusting a surfactant or the like so as to match the critical surface tension (20 to 25 dyne) of the foamed material such as the polyolefin resin as the base material (1).

As a result, the affinity for the polyolefin resin foam is improved, and in combination with the application to the sliced surface as described above, even a weak tacky adhesive having a weak adhesive force, Further, even if it is a thin layer, it can be surely applied with a uniform thickness over the entire surface.

For example, the adhesive strength to other articles is weak, but the adhesive strength between the surfaces of the adhesive layer is relatively large.
m ² or less, preferably 10 to 25 g / m ²
The solid component is 5 to 15 g / m ² . As a result, it is possible to easily carry out a weak adhesion or a slight adhesion type adhesive hoop.

The above-mentioned pressure-sensitive adhesive tape or the like can be embodied in the form of a tape having a required width as shown in FIG. 1 or in the form of a wide sheet, but in any case, it is formed into a roll as shown in FIG. Wind it up, peel it off and unfold it,
It is used as a packaging material and protective material for various products.

The surface of the pressure-sensitive adhesive layer (2) provided on the sliced surface (11) of the foam, which is the base material (1), is
Part of the adhesive is a minute recess (13) on the slice surface (11)
Since it enters into a minute unevenness, even if an adhesive having the same adhesive force as in the past is applied with the same coating amount, the adhesive force is weak unless strongly pressed, and therefore, it is wound into a roll as described above. Even when taken, it does not adhere strongly to the base material of the lower layer and can be easily peeled off and developed. Particularly when the substrate (1) is a polyolefin resin foam and has a skin layer (12) on the surface opposite to the pressure-sensitive adhesive layer (2), the pressure-sensitive adhesive layer (2) has good releasability. The peeling and expanding operation becomes easier.

On the other hand, when it is strongly pressed and adhered during use, since the base material (1) is a foam having elasticity, as shown in FIG. )
Is also exposed to the outer surface to contribute to the adhesive action, and innumerable minute recesses (13) on the entire surface exert a sucker effect, and even if it is a weakly sticky adhesive, it is in use It does not come off easily, and it also prevents slippage in the surface direction and also serves as a slip stopper. Moreover, if the adhered adhesive tape or the like is peeled off, it can be peeled off relatively easily, and the adhesive does not remain on other objects.

[0040]

As described above, according to the pressure-sensitive adhesive tape or sheet of the present invention, since the pressure-sensitive adhesive is applied to the slice surface of the synthetic resin foam as the base material, the pressure-sensitive adhesive can be applied (coatability). ) Is good, and even if the amount of adhesive applied is not so large, even if it is a self-adhesive or pressure-sensitive adhesive type or slightly adhesive type adhesive with relatively weak adhesive strength, it is also possible to use a polyolefin resin, etc. Even if the foamed material is used as a base material, it can be applied over the entire surface to a uniform thickness. Therefore, it is possible to easily provide an adhesive tape or sheet having an adhesive force depending on the application. For example, it is possible to easily carry out a weak-adhesion or slight-adhesion type in which no adhesive remains on the surface.

Moreover, by forming the adhesive layer formed by coating on the sliced surface of the foam, even if it has the same root adhesiveness as the conventional one, the presence of minute concave portions peculiar to the sliced surface on the entire surface Therefore, the adhesiveness is low when not strongly pressed.On the other hand, when strongly pressed, the adhesive in the minute recesses contributes to the adhesion, and in combination with the suction effect of the minute recesses, it has a moderately strong adhesive force. It does not easily peel off, and on the other hand, it easily peels off from the surface of other articles, and can be suitably used as a packaging material or a protective material.

Furthermore, since the corona discharge treatment is unnecessary as described above, the cost can be reduced and the foamed material of the base material can be made thin, and the coating amount can be reduced and the base material can be formed. The thickness can be reduced to reduce the cost.

When the base material is a polyolefin resin foam and the surface on the side opposite to the adhesive layer provided on the slice surface is a skin layer, the surface of the skin layer on the opposite side of the adhesive layer is Since it does not adhere strongly to the adhesive layer, therefore, it can be rolled up as it is without overlapping the release paper on the pressure-sensitive adhesive layer or applying the release treatment to the other surface. It can be easily peeled off and developed without the need to peel off release paper.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of the above.

FIG. 3 is a further enlarged cross-sectional view showing a coated state of an adhesive layer.

FIG. 4 is an enlarged cross-sectional view showing a pressing and use state of the above.

[Explanation of symbols]

 (1) Substrate (11) Slice surface (12) Skin layer (13) Minute recesses (2) Adhesive layer (21) Adhesive

Claims (2)

[Claims] 1. A sliced synthetic resin foam is used as a base material,
An adhesive tape or sheet having an adhesive applied to the sliced surface. 2. A polyolefin resin foam having a skin layer is sliced to form a base material, an adhesive is applied to the sliced surface, and one surface is an adhesive layer and the other surface is a skin layer. Adhesive tape or sheet.