JPH09235788A - Waterproof tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability and waterproofness by setting peel strength on the contact surface side with the pressure sensitive adhesive layers of the double-side separators of a waterproof tape in specific number of more and making the peel strength on the contact surface side larger than that on the reverse surface side. SOLUTION: A pressure sensitive adhesive layer 2 is composed of pressure sensitive adhesives such as a butyl rubber keeping waterproofness and having proper elongation and tacking, and a polymer film, etc., having release properties and capable of being burnt and incinerated are used as a separator 1. Peel strength on the contact surface side 1a with the pressure sensitive adhesive layer 2 of the separator 1 is set in 500g/ inches or more, and made larger than that on the reverse surface side 1b, and the contact surface side 1a is difficult to be peeled from the pressure sensitive adhesive layer 2. When the pressure sensitive adhesive layer 2 of a waterproof tape held under a wound state before the execution of works is joined with an adherend and executed while being wound out and extended, the separator of a joining section is peeled in approximately 50-100mm, and another waterproof tape is extended. Accordingly, separator itself has a waterproof function, and the waterproof tape protecting the pressure sensitive adhesive layer can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called throw-on type waterproof tape used as a waterproof material in buildings and the like.

[0002]

2. Description of the Related Art A waterproof tape used for waterproofing a building is, for example, as shown in FIG. 4, a pressure-sensitive adhesive layer a made of butyl rubber or the like is provided with separators b having releasability on both sides, and the tape is wound into a fixed length. Has been. When such a waterproof tape is constructed, both are pulled apart at the same time to bond to the adherend,
The double-sided separator b is peeled off after joining. Further, as shown in FIG. 5, a waterproof tape used in a region where behavior is expected, such as a large gap, is provided with a protective layer c on one surface of an adhesive layer a and a single-sided separator d on the other surface. ing. When such a waterproof tape is applied, the separator d is peeled off and joined to the adherend.

[0003]

However, in both of the conventional waterproof tapes shown in FIGS. 4 and 5, the separators are incinerated as garbage, but many separators are made by laminating polyethylene on paper and using silicone. Since it is treated with a release agent, it cannot be incinerated at the same time as other dust, and it is difficult to treat industrial waste. Further, in the structure shown in FIG. 5, in addition to the separator becoming dust, the workability is poor because the separator is peeled off during the construction, and it is also necessary to add a reinforcing function to the protective layer for improving the workability. Further, if the protective layer is soiled, it floats or peels off even if it is rolled, causing water leakage. It is also conceivable to replace the double-sided separator of the waterproof tape shown in FIG. 4 with a single-sided separator and combine it with an adhesive layer to make it a type that does not peel off the separator. .
Then, this invention eliminates the inconvenience of the said conventional waterproof tape, and aims at providing the waterproof tape excellent in workability and waterproofness.

[0004]

In order to solve the above-mentioned problems, the waterproof tape of the present invention is a waterproof tape comprising a pressure-sensitive adhesive layer provided with a double-sided separator, wherein the double-sided separator has a contact surface side with the pressure-sensitive adhesive layer. And the peel strength of the contact surface side is larger than the peel strength of the opposite surface side. The waterproof tape according to a second aspect of the invention is characterized in that the difference in peel strength between the opposite surface side and the contact surface side is a difference of 1: 4 or more. The waterproof tape according to claim 3 is characterized in that the difference in peel strength between the opposite surface side and the contact surface side is a difference of 1:10 or more. The waterproof tape according to claim 4 is characterized in that the peel strength on the contact surface side is 500 to 1000 g / inch, and the peel strength on the opposite surface side is 30 to 10 g / inch. The waterproof tape according to claim 5 is characterized in that the pressure-sensitive adhesive layer is made of butyl rubber, and the double-sided separator is made of a poly film treated with a release agent. The waterproof tape according to claim 6 is characterized in that the poly film is an unstretched polypropylene film.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The pressure-sensitive adhesive layer is not particularly limited as long as it is composed of a pressure-sensitive adhesive that maintains waterproofness, but it has appropriate elongation and stickiness, It is preferable to use butyl rubber that can follow the behavior of the adhered body. The thickness of the pressure-sensitive adhesive layer is preferably 0.2 mm or more when it is used on a smooth surface and 0.5 mm or more when it is used on a site where unevenness or behavior occurs.

The separator is not particularly limited in type as long as it has a releasability by a release treatment such as silicon or peeling, but in the case of a release paper using paper as a base material, it has a cut end. It is preferable to use a poly film which does not contain water from the cut and which can be recycled or burned because it contains water and peels off, and is easily burnt and cannot be discarded. For example, a polyethylene film, a polypropylene film, a polyethylene terephthalate film, a polyvinyl chloride film, a nylon film or the like is desirable. In addition, unstretched polypropylene such as high impact casting polypropylene (CPP) is equivalent to EPT / butyl vulcanized waterproof sheet with a thickness of 0.05 mm and a physical value of 1 mm, and the cost is about 1/20. It is particularly preferable because it is a material that can be processed.

The peel strength of the contact surface side of the separator with the pressure-sensitive adhesive layer should be 500 g / inch or more, and should be higher than the peel strength of the opposite surface side. This peel strength is 50
This is because if it is less than 0 g / inch and the peel strength between the contact surface side and the opposite surface side is about the same, the separator may be displaced or peeled from the pressure-sensitive adhesive layer during the construction, which causes inconvenience in construction. As described above, the waterproof tape of the present invention is characterized in that the peel strength of one surface of the double-sided separator is configured to be large so that the double-sided separator is hardly peeled from the adhesive layer and the separator itself is used as a conventional protective layer. Even when the peel strength is increased in this way, the separator can be peeled off after the construction because the adhesive layer is bonded to the adherend. For example, a penetration of 40 to 60 and a thickness of 0.5 to
The peel strength when 2.0 mm butyl adheres to the adherend is 1.5 to 2.5 kg / inch, so only the separator can be peeled without peeling the butyl.

Further, by setting the difference in peel strength between the opposite surface side and the contact surface side of the separator to be 1: 4 or more, preferably 1:10 or more, the waterproof tape is wound while being bonded to the adherend. It is possible to reliably prevent the separator from peeling from the pressure-sensitive adhesive layer when unwinding from the state. The peel strength on the contact surface side is 500 to 1000 g / inch,
When the peeling strength on the opposite surface side is 30 to 10 g / inch, it is ensured that the separator is peeled off from the pressure-sensitive adhesive layer when unwinding from the wound state while bonding the waterproof tape to the adherend as described above. This can be prevented, and as will be described later, even when the separator is slightly peeled off at the joint of the waterproof tape, the separator can be easily peeled off, resulting in excellent workability.

As described above, in the present invention, the peel strength of the contact surface side of the double-sided separator with the adhesive layer is 500 g / inch or more, and the peel strength of the contact surface side is made larger than the peel strength of the opposite surface side. Since it can be stored in a wound state before use like a conventional double-sided separator, the adhesive layer and the separator do not have dust and the like, and the waterproof property may be impaired during storage. Absent. Moreover, since it is not necessary to peel off the separator during the construction, the construction is easy. Further, in the joint portion of the waterproof tape, since the separator of the joint portion can be peeled off a little and replenished, the waterproof property at the joint portion is also excellent.

[0010]

EXAMPLES Next, specific examples of the waterproof tape of the present invention will be described. The waterproof tape of this embodiment shown in FIGS. 1 to 3 is obtained by forming a pressure-sensitive adhesive layer 2 made of butyl rubber having a thickness of 0.6 mm on a separator 1 made of a casting polypropylene sheet having a thickness of 0.05 mm and a width of 55 mm. , The contact surface side 1 of the separator 1 with the adhesive layer 2
1.0kg by subjecting a to a peeling release process
A peeling strength of 0.01 kg / inch is obtained by applying a silicone release treatment to the opposite surface side 1b. The peel strength of 1.0 kg / inch is about the same as the unwinding force of a commercially available adhesive tape for office use. As shown in FIG. 1, this waterproof tape can be held in a wound state before construction, and at the time of construction, it can be constructed by adhering an adhesive layer of the waterproof tape to an adherend as shown in FIG.

When it is necessary to add a waterproof tape, the separator at the joining portion is replaced by 50 as shown in FIG.
It is peeled off by about 100 mm, and another waterproof tape is added to the peeled off portion to ensure 100% water-stopping property and to be added. Thus, it is possible to obtain a discarded and attached waterproof tape which does not generate dust, is inexpensive, is lightweight, has good workability, waterproofness, and zero-span strength.

[0012]

As described above, according to the present invention, by providing a large difference in the peel strength of the separator, the separator itself has a waterproof function, and the adhesive layer can be protected and the adhesive layers can be joined together. We can provide abandoned waterproof tape.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing the same usage state.

FIG. 3 is a perspective view showing a state in which the joint is added.

FIG. 4 is a perspective view of a conventional waterproof tape.

FIG. 5 is a perspective view of a conventional waterproof tape.

[Explanation of symbols]

 1 Separator 1a Contact surface side 1b Opposite surface side 2 Adhesive layer

Claims (6)

[Claims] 1. A waterproof tape comprising a pressure-sensitive adhesive layer provided with a double-sided separator, wherein the double-sided separator has a peel strength of 500 g / inch or more on the contact surface side with the pressure-sensitive adhesive layer and a peel strength on the contact surface side. The waterproof tape is characterized in that the peel strength is larger than that on the opposite surface side. 2. The waterproof tape according to claim 1, wherein the difference in peel strength between the opposite surface side and the contact surface side is a difference of 1: 4 or more. 3. The waterproof tape according to claim 2, wherein the difference in peel strength between the opposite surface side and the contact surface side is 1:10 or more. 4. The peel strength on the contact surface side is 500 to 10
The peel strength on the opposite side is 30 to
The waterproof tape according to claim 3, wherein the waterproof tape is 10 g / inch. 5. The waterproof tape according to claim 1, wherein the pressure-sensitive adhesive layer is made of butyl rubber, and the double-sided separator is made of a polyfilm treated with a release agent. 6. The waterproof tape according to claim 5, wherein the poly film is an unstretched polypropylene film.