JP2006348140A - Pressure-sensitive adhesive double coated tape, production method for the pressure-sensitive adhesive double coated tape and mounting method for object to be adhered - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive pressure-sensitive adhesive double coated tape exhibiting a sufficient water-proofing property capable of adjusting an arrangement position of an object to be adhered when the object to be adhered is arranged on an adhesion layer, being extremely easily produced and realizing recycling of inferior goods or the like. <P>SOLUTION: In the pressure-sensitive adhesive double coated tape 10, an easily crushable coating film 12 is formed on at least a part of a surface of the adhesion layer 11. In the pressure-sensitive adhesive double coated tape 10, since the adhesion layer 11 is coated with the coating film 12, after the object to be adhered is temporarily arranged on the coating film 12 and the arrangement position is adjusted the object to be adhered can be adhered. At the adhesion, the coating film 12 is finely crushed by pressing force at that time and the adhesion property of the adhesion layer 11 is exhibited. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a double-sided pressure-sensitive adhesive tape suitably used for waterproofing buildings, a method for producing the double-sided pressure-sensitive adhesive tape, and a method for attaching an adherend using the double-sided pressure-sensitive adhesive tape.

  For example, a window sash frame or the like is attached to an opening of a building frame. At this time, a waterproof treatment is performed on a gap between a steel frame or a wooden frame constituting the opening and the sash frame. Rainwater is not allowed to enter. In addition, the balcony usually has a gutter member formed with a gutter that drains rainwater, and a flooring is laid on it. In this case, the water overflowing from the gutter is below the flooring. Waterproofing is performed between the eaves member and the floor material so as not to enter.

A double-sided adhesive tape made of butyl rubber may be used for waterproofing such a building.
For example, when waterproofing an opening of a building frame with this double-sided adhesive tape, usually, a double-sided adhesive tape is stuck on the steel frame or wooden cross of the opening, and a sash frame for windows is placed on it, The method of making it adhere is taken. According to such a method, the steel frame or the wooden frame and the sash frame can be brought into close contact with each other due to the high adhesiveness of butyl rubber, and can be effectively waterproofed.
However, since butyl rubber has very high adhesiveness, once the butyl rubber and an adherend such as a sash frame come into contact with each other, it is difficult to remove them again. Therefore, when adhering the adherend to the double-sided adhesive tape attached to the steel frame or the wooden crosspiece, there is a problem that the position adjustment of adjusting the placement position of the adherend after the temporary placement of the adherend cannot be performed. .

  As a solution to such a problem, Patent Document 1 proposes a waterstop material in which a thread-like body that can be buried in an adhesive layer by a pressing force is laid on the surface of an adhesive layer made of butyl rubber. According to this water-stopping material, since the filamentous body is interposed between the adherend and the adhesive layer, the adhesive force of the adhesive layer made of butyl rubber is weakened, and after the butyl rubber and the adherend have once contacted each other Even so, the arrangement position of the adherend can be adjusted. Moreover, after adjusting the arrangement position, the filamentous body is buried in the adhesive layer by pressing the adherend against the adhesive layer, and as a result, adhesiveness is developed.

Patent Document 2 proposes a double-sided tape including a film-like base material that partially covers both sides of an adhesive layer made of butyl rubber, and Patent Document 3 discloses that the width of the film-like base material is butyl rubber. A waterproof tape having a width equal to or greater than the width of the adhesive layer is disclosed. According to these tapes, since there is a non-adhesive base material, the adherend can be temporarily arranged using this, and the placement position of the adherend can be adjusted. And in the double-sided tape of patent document 2, adhesiveness and waterproofness can be exhibited in the part which is not covered with the base material in an adhesive layer, and in the waterproof tape of patent document 3, an adhesive layer protrudes from a base material by pressing force. By doing so, the sticking and waterproofing can be exhibited at the protruding portion.
JP-A-10-131315 JP 2004-300837 A JP 2004-292603 A

However, the waterstop material of Patent Document 1 has a problem that it is difficult to manufacture.
That is, the pressure-sensitive adhesive layer made of butyl rubber is conventionally manufactured in a process in which it is formed into a strip shape by an extruder, cooled by a cooling water tank, stabilized in shape, and then wound by a winder together with a release sheet. In many cases, when the waterstop material of Patent Document 1 is manufactured, a method of attaching a thread-like body supply device to such an extrusion production line is common. However, in such a water-stopping material, the filamentous body is appropriately laid so that it is not embedded in the adhesive layer before use but is present on the surface and is easily embedded in the butyl rubber adhesive layer during use. It is indispensable. For this purpose, it is necessary to strictly control the tension of the filamentous material to be supplied, the line speed of extrusion molding, and the like, which is very difficult. Further, in order to securely arrange the filamentous body on the surface without being buried in the adhesive layer, it is necessary to supply the filamentous body to the adhesive layer that is sufficiently cooled and whose shape is stabilized. Therefore, the attachment position of the filamentous body supply device is naturally limited between the cooling water tank and the winder, and there is a difficulty in the attachment space.
Furthermore, if the control of the tension and line speed of the filamentous body is insufficient at the time of manufacture, the filamentous body becomes a defective product embedded in an adhesive layer made of butyl rubber. However, since it is almost impossible to separate and recover, all defective products become waste that cannot be reused.

  Moreover, although the thing of patent document 2 and 3 can adjust the arrangement position of a to-be-adhered body by providing the base material in the adhesion layer, the part by which the base material is provided on the other hand Then, since the adhesive layer and the adherend do not adhere, waterproofness may be insufficient. Furthermore, when manufacturing the thing of patent document 2 and 3, when the inferior goods by which the base material has been arrange | positioned in the improper position produced, separating and recovering this inferior goods into a base material and butyl rubber is patent. As in the case of the water-stopping material in Document 1, it is still difficult, and all defective products become waste.

  The present invention has been made in view of the above circumstances, and when the adherend is placed on the adhesive layer, the placement position of the adherend can be adjusted, sufficient waterproofness is expressed, and manufacturing is very easy. Therefore, it is an object to provide a low-cost double-sided adhesive tape that can be reused for defective products.

The double-sided pressure-sensitive adhesive tape of the present invention is characterized in that an easily friable coating film is formed on at least a part of the surface of the pressure-sensitive adhesive layer.
The coating film is preferably composed of one or more selected from the group consisting of gelatin, cellulose, starch, and water glass.
The adhesive layer is preferably composed of one or more selected from the group consisting of butyl rubber, silicone rubber, acrylic rubber, urethane rubber, polyisobutylene, and thermoplastic elastomer.
The method for producing a double-sided pressure-sensitive adhesive tape according to the present invention is a method for producing the double-sided pressure-sensitive adhesive tape, comprising: forming a pressure-sensitive adhesive layer; applying a coating liquid to at least a part of the surface of the pressure-sensitive adhesive layer; And a step of forming.
The attachment method of the adherend according to the present invention is an attachment method of the adherend using the double-sided pressure-sensitive adhesive tape, wherein the double-sided adhesive surface on which the coating film is formed is at least on the outer side. Temporarily disposing the adherend so that the adherend is in contact with the adhering step of adhering the adhesive tape to the adherend attachment portion, and the outer surface of the adhered double-sided adhesive tape. It has an arrangement | positioning process, the position adjustment process which adjusts the arrangement position of the said adherend on the said double-sided adhesive tape, and the adhesion process which presses and adheres the said adherend to the said double-sided adhesive tape, It is characterized by the above-mentioned. .

  According to the present invention, when the adherend is placed on the adhesive layer, the placement position of the adherend can be adjusted, sufficient waterproofness is expressed, and the manufacture is very easy. A low-cost double-sided adhesive tape that can be used can be provided.

Hereinafter, the present invention will be described in detail with reference to exemplary embodiments.
FIG. 1 shows a double-sided pressure-sensitive adhesive tape 10 according to this embodiment, which is composed of an adhesive layer 11 and an easily friable coating film 12 provided on the entire surface of one side of the adhesive layer 11.
The pressure-sensitive adhesive layer 11 is formed of a material that is easily deformed by a pressing force and has adhesiveness. The pressure-sensitive adhesive layer 11 in this example is made of a belt-shaped butyl rubber having a thickness of about 5 mm. .
The coating film 12 has easy crushability, and in this example, the glue aqueous solution is applied to the entire surface of the adhesive layer 11 and then dried, and has a thickness of about 1 to 50 μm. It has become.

Here, “easily friable” means a property of being easily crushed by the pressing force applied when the double-sided adhesive tape is stuck.
According to the double-sided pressure-sensitive adhesive tape 10 in which such an easily fragile coating film 12 is provided on the surface of the pressure-sensitive adhesive layer 11, the position of the adherend is placed on the double-sided pressure-sensitive adhesive tape 10 when the adherend is stuck. In addition, high waterproofness can be exhibited after the adherend is attached.

That is, by using the double-sided pressure-sensitive adhesive tape 10 of FIG. 1, for example, a window sash frame (adhered body) is attached to a steel frame (adhered body mounting portion) constituting an opening of a building housing, and these In the case of waterproofing the gap, first, the double-sided adhesive tape 10 is a steel frame so that the surface on which the coating film 12 is not formed is on the inside and the surface on which the coating film 12 is formed is on the outside. Affix to (attachment process).
Next, the sash frame is provisionally disposed so that the outer surface of the double-sided pressure-sensitive adhesive tape 10 attached to the steel frame, that is, the surface on the side where the coating film 12 is formed is in contact with the sash frame (temporary placement step).
Next, the arrangement position of the sash frame is adjusted on the double-sided pressure-sensitive adhesive tape 10 (position adjustment process), and then the sash frame is pressed and adhered to the double-sided pressure-sensitive adhesive tape 10 (adhesion process).

In such a double-sided pressure-sensitive adhesive tape 10, the pressure-sensitive adhesive layer 11 on the side in contact with the sash frame is covered with the coating film 12, and therefore hardly exhibits adhesiveness. Therefore, after the sash frame is temporarily arranged on the double-sided pressure-sensitive adhesive tape 10 as described above, the arrangement position can be adjusted.
When the sash frame is pressed against the double-sided adhesive tape 10 after the arrangement position is determined by the temporary arrangement step, the adhesive layer 11 is crushed and deformed by the pressing force at this time, but the coating film 12 is easily crushed. Therefore, it does not follow the deformation of the adhesive layer 11 and is finely crushed. As a result, because the crushed pieces of the coating film 12 are buried in the adhesive layer 11 or the adhesive layer 11 is exposed from the gaps between the crushed pieces, the adhesiveness of the adhesive layer 11 is manifested, and the sash frame is sufficient. Can be adhered. In addition, waterproofness improves more by fixing a sash frame, pressing it to the double-sided adhesive tape 10 more strongly using fixing tools, such as a volt | bolt, after an adhesion process.

The adhesiveness thus developed is at the same level as that of the adhesive layer 11 where the coating film 12 is not provided, and the arrangement position of the adherend can be adjusted by providing a thread-like body or a substrate in the adhesive layer. Compared to the conventional product, high waterproofness can be achieved. Therefore, according to such a double-sided pressure-sensitive adhesive tape 10, it is possible to adjust both the position of the adherend, which has been difficult in the past, and to exhibit high waterproofness.
Moreover, by providing the coating film 12 in this manner, the shape and horizontal shear performance of the adhesive layer 11 are easily maintained.
Furthermore, since the coating film 12 formed on the adhesive layer 11 is easily crushed into fine crushed pieces and buried in the adhesive layer 11, the subsequent adhesiveness and workability of the adhesive layer 11 are not affected. Therefore, defective products generated at the time of manufacture can be reused as butyl rubber raw materials, waste can be reduced, and the production cost of the double-sided pressure-sensitive adhesive tape 10 can be suppressed. In addition, the crushed pieces contained in the recycled butyl rubber raw material are dispersed when the butyl rubber raw material is re-kneaded, and as a result, it can be expected to act as a rubber reinforcing material during reuse.

Such a double-sided pressure-sensitive adhesive tape 10 can be manufactured as shown in FIG.
First, butyl rubber is continuously extruded from the extruder 20 at a temperature of about 80 to 100 ° C. to form the belt-like adhesive layer 11.
Next, a coating solution containing about 20 to 50% by mass of glue in an aqueous solvent is applied to the entire surface of the adhesive layer 11 thus formed by the coating device 21. Then, moisture in the applied coating solution evaporates and dries due to the residual heat at the time of extrusion of the pressure-sensitive adhesive layer 11 to form a coating film 12, and the double-sided pressure-sensitive adhesive tape 10 of FIG. 1 is obtained. In addition, the heat absorption due to the evaporation of moisture cools the adhesive layer 11 and stabilizes its shape.
The double-sided pressure-sensitive adhesive tape 10 thus obtained is wound up with a release sheet (not shown) by a winder 22 to obtain a wound product.

As described above, the double-sided pressure-sensitive adhesive tape 10 of FIG. 1 can be manufactured with a simple device in which the coating device 21 for coating the coating liquid is provided at the subsequent stage of the extruder 20. It can be manufactured very easily compared with the conventional one provided in FIG. Various known coaters can be used as the coating device 21. However, since strict thickness control is not necessary for the formation of such a coating film 12, for example, a simple brush consisting of a brush and a container for storing the coating liquid. Even a coater having a configuration can be used sufficiently.
Furthermore, according to such a manufacturing method, since the adhesive layer 11 is cooled by heat absorption due to evaporation of moisture in the coating liquid, a cooling water tank conventionally provided between the extruder 20 and the winder 22 is used. There is no need to provide a separate cooling device. Specifically, after applying an aqueous solution of glue having a concentration of 20 to 50% by mass as a coating solution to the adhesive layer 11 immediately after extrusion, the coated coating solution is approximately 3 m when transported by a belt conveyor at a speed of 10 m / min. The coating layer 12 is dried, while the pressure-sensitive adhesive layer 11 is sufficiently cooled to stabilize the shape.
The solvent of the coating solution is preferably water because it is easy to handle and has no chemical influence on the butyl rubber, but an organic solvent such as alcohol can also be used as long as the butyl rubber is not affected.

The pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape is not particularly limited as long as the shape is easily deformed by the pressing force and has adhesiveness. Synthetic rubber and synthetic resin can be used as appropriate, but butyl rubber, silicone rubber, acrylic Rubber, urethane rubber, polyisobutylene, and thermoplastic elastomer (such as oil-extended TPE) are preferable. Also, as the shape, in addition to the belt-like one having both surfaces flat as in the illustrated example, for example, a plurality of butyl rubber linear bodies having a substantially circular cross section of about 5 mm are drawn in parallel and joined to each butyl rubber wire. It may be such that grooves are formed between the bodies. In such a case, each groove acts as a water stop groove, and higher waterproofness is expressed, and in the sticking process and the adhesion process, the applied pressing force is a convex portion between the grooves. Since a high pressure is applied to this portion, the degree of adhesion between the adhesive layer and the adherend mounting portion or between the adhesive layer and the adherend can be further increased.
The coating film formed on the adhesive layer may be any coating material that has an easily crushed property by the pressing force applied when the double-sided adhesive tape is applied. (Including derivatives), starch (including derivatives), water glass and the like can be preferably used. Since these units have a very low unit price, the cost can be markedly reduced compared to the conventional type, which can adjust the position of the adherend by providing a thread or base material on the adhesive layer. Can be suppressed.

  Moreover, the easily friable coating film may be formed on at least a part of the surface of the adhesive layer, and when it is formed on the entire surface of both surfaces, when it is formed on the entire surface of one side and a part of the other surface, Any of them may be formed on a part of each surface. When formed on both sides, the sticking position can be adjusted also in the sticking step of sticking the double-sided pressure-sensitive adhesive tape to the adherend attachment part. On the other hand, when the coating film is formed only on one surface as in the above-described embodiment, the surface on which the coating film is formed is adhered to the adherend. Further, even when the coating film is formed only on a part of the surface, the adhesion of the adhesive layer is weakened by the presence of the coating film, so that the position of the adherend can be adjusted without any problem. .

Such double-sided pressure-sensitive adhesive tape can be used as a waterproofing material at various places in the building, and as described above, in addition to waterproofing the window sash frame at the opening of the building, it can It can be suitably used for a waterproofing process between.
In addition, in the field of waterproofing treatment, it is left after sticking the double-sided adhesive tape on the adherend mounting part, and there may be a time of several days between the sticking process and the temporary placement process. In this case, since the coating film formed on the surface to which the adherend adheres also acts as a protective film that protects the adhesive layer from dust and rainwater, there is no need to separately provide a protective film or the like.

It is a perspective view of the double-sided adhesive tape which is one embodiment of this invention. It is a schematic explanatory drawing of the method of manufacturing the double-sided adhesive tape of FIG.

Explanation of symbols

10 Double-sided adhesive tape 11 Adhesive layer 12 Coating film

Claims (5)

  A double-sided pressure-sensitive adhesive tape, wherein an easily friable coating film is formed on at least a part of the surface of the pressure-sensitive adhesive layer.   The double-sided pressure-sensitive adhesive tape according to claim 1, wherein the coating film comprises at least one selected from the group consisting of gelatin, cellulose, starch, and water glass.   The double-sided pressure-sensitive adhesive tape according to claim 1 or 2, wherein the pressure-sensitive adhesive layer comprises at least one selected from the group consisting of butyl rubber, silicone rubber, acrylic rubber, urethane rubber, polyisobutylene, and thermoplastic elastomer. Forming an adhesive layer;
The method for producing a double-sided pressure-sensitive adhesive tape according to any one of claims 1 to 3, further comprising a step of applying a coating liquid to at least a part of the surface of the pressure-sensitive adhesive layer to form a coating film. A method for attaching an adherend using the double-sided pressure-sensitive adhesive tape according to any one of claims 1 to 3,
A sticking step of sticking the double-sided pressure-sensitive adhesive tape to an adherend attachment part so that the surface of the pressure-sensitive adhesive layer on which the coating film is formed is at least outside,
A temporary arrangement step of temporarily arranging the adherend so that the outer surface of the double-sided adhesive tape adhered and the adherend are in contact with each other;
A position adjusting step for adjusting the position of the adherend on the double-sided adhesive tape;
A method of attaching the adherend, comprising: an adhesion step of pressing the adherend against the double-sided pressure-sensitive adhesive tape to adhere the adherend.

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