JP2003027665A - Adhesive film for hard roofing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive film for a hard roofing material, which is stuck to the hard roofing material, effectively prevents scattering of the roofing material in the case of its falling, and can easily be stuck to the roofing material. SOLUTION: The adhesive film to be stuck to an installation surface of the hard roofing material, includes a substrate and an adhesive. In the substrate, a maximum load (Tr×t) in a tear strength test, which is obtained by multiplying a tear strength (Tr) in each of a mechanical direction (MD) and a crosswise direction (CD) of the substrate, by a thickness (t) of the substrate, is equal to five Newtons or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive film for a hard roof material, which is attached to the back surface (installation surface) of the hard roof material to prevent the hard roof material from scattering.

[0002]

2. Description of the Related Art Roofing materials are used for roofs of buildings such as houses. Since such a roofing material is required to have strength, a hard roofing material is generally used. But,
There is a pressure difference between the surface of the roofing material and the inner surface of the roofing material due to strong winds, etc., so stress is applied to the roofing material, the roofing material may drop and be damaged, and debris may be scattered, which is dangerous. .

In order to prevent such scattering of the roofing material, Japanese Patent Laid-Open No. 60-226434 discloses glass by sandwiching a resin sheet between two glass roof tiles and performing heat molding. A method for manufacturing roof tiles is disclosed. However, this method requires complicated manufacturing steps and can be used only for glass roof tiles.

Japanese Utility Model Laid-Open No. 6-30317 discloses a roof tile scattering prevention net in which a hose pipe bag is attached to an end portion or an intermediate portion of the net. The scattering prevention net covers the entire roof with the net. , Collect water in the hose bag,
It is used as a weight. This net is not practical because it takes a lot of time and effort to put it on and it spoils the appearance of the roof material itself.

Japanese Utility Model Publication No. 62-32124 discloses a roof material in which a synthetic resin thin film sheet having elasticity and water impermeability is adhered to the lower surface of a corrugated asbestos slate roof material. However, in this publication, there is no description about the strength of the sheet, and when a sheet having insufficient strength is used, effective scattering prevention cannot be achieved. Further, since a heat-activatable adhesive that is softened by heating is used as the adhesive, it takes a lot of time to attach the sheet to the roof material.

[0006]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an adhesive film for a hard roofing material which can effectively prevent the roofing material from scattering when the roofing material is dropped and can be easily attached. That is.

[0007]

According to the present invention, in a film for a hard roof material to be attached to an installation surface of a hard roof material, the film comprises a base material and an adhesive, and the machine direction of the base material. The maximum load (Tr × t) in the tear strength test, which is obtained by multiplying the tear strength (Tr) in (MD) and the transverse direction (CD) by the thickness (t) of the base material, is 5 Newtons (N) or more. An adhesive film for a hard roofing material is provided. In such a film, when the hard roofing material is dropped and damaged, the adhesive film is unlikely to tear, and sufficient scattering prevention performance can be obtained. Tear strength (Tr)
Is the value measured according to JIS-K-7331.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The base material for an adhesive film for a hard roofing material of the present invention has a tear strength (Tr) in the machine direction (MD) and transverse direction (CD) of the base material and a thickness (t) of the base material. The maximum load (Tr × t) in the tear strength test applied with (1) is 5 N or more. This is because when the maximum load (Tr × t) in the tear strength test is less than 5N, the base material is torn when the hard roof material is damaged, and a sufficient scattering prevention effect cannot be obtained. The substrate is a plastic film, preferably a polyester, a polyolefin such as polyethylene or polypropylene, or a polyvinyl chloride film. This is because an appropriate strength is obtained and the material is inexpensive. There is no particular theoretical upper limit to the maximum load (Tr × t) in the tear strength test, but it is usually 40 N or less. For a base material having a maximum load (Tr × t) in the tear strength test of more than 40 N, the thickness must be increased to a level that is impractical for commonly used resins. In such a case, the cost of the film for a hard roof material becomes high, not only the workability of the sticking work is deteriorated, but also the followability of the film to the hard roof material surface having unevenness is deteriorated, so that the roof material It is not preferable because it may cause a problem that the adhesiveness between the film and the film is low and the film is easily detached. The maximum load (Tr × t) in the tear strength test is more preferably 8 N to 20 N from the viewpoint of the scattering prevention effect, cost, application workability, and film adhesion.

The thickness of the substrate is generally 20 to 150 μm, which is a thickness that is easily available. More preferably, 2
It is 5 μm to 100 μm, and in this case, sufficient strength is obtained and the cost is low.

The substrate for the adhesive film for a hard roofing material of the present invention preferably also has sufficient flexibility. The back surface of the roofing material such as slate and roof tiles (the surface to which the film for hard roofing is attached) usually has irregularities, so follow the irregularity and adhere the film to the surface to which the roofing material is attached. Because it can be pasted. Examples of such a substrate include a film of the above resin material having a low orientation of polymer molecules, that is, an unstretched film of polyester, polyolefin such as polyethylene or polypropylene, or polyvinyl chloride.
The base material preferably has a tensile strength of 80 N / 25 mm or less when stretched by 5% as measured by JIS-Z-0237. There is no theoretical lower limit to the tensile strength of the substrate when stretched by 5%, but it is usually 5 N / 25 mm or more. When it is 5 N / 25 mm or less, tensile stress is applied to the substrate during the pressure-sensitive adhesive coating process, the substrate is elongated, and it may be difficult to manufacture the film.

The adhesive film for a hard roofing material of the present invention has an adhesive layer on a substrate. As the adhesive, a natural rubber adhesive, a synthetic rubber adhesive, an acrylic adhesive, a silicone adhesive or the like can be used. The adhesive film is used outdoors, and it is necessary to use an adhesive having high weather resistance so that it can be used for a long period of time.
From this point of view, acrylic adhesives and silicone adhesives are particularly preferable. Although the thickness of the pressure-sensitive adhesive layer is not limited, it is preferably 25 μm to 75 μm, which facilitates the pressure-sensitive adhesive coating process and obtains a suitable pressure-sensitive adhesive force.

The form of the hard roof adhesive film of the present invention is not limited to the following, but the following forms are possible. FIG. 1 shows a cross-sectional view of one embodiment of an adhesive film according to the present invention. An adhesive film 10 for a hard roofing material has a pressure-sensitive adhesive layer 2 applied on one surface of a substrate 1, and a back surface treating agent (release agent) 3 is provided on the opposite surface. With such a configuration, the pressure-sensitive adhesive film of the present invention is in the form of a rollable pressure-sensitive adhesive tape. As the release agent, various types such as silicone-based, acrylic-based, polyvinyl carbamate-based, polyethyleneimine-based can be used, but a silicone-based or polyvinyl carbamate-based release agent that enables unwinding of a light tape is particularly preferable. . Further, as another aspect, a release liner may be provided on the pressure-sensitive adhesive layer 2 instead of providing the back surface treatment agent 3.

Roofing materials to which the adhesive film for a hard roofing material of the present invention can be applied are various roofing materials including clay roof tiles, glass roof tiles, slate, and ceramic roofing materials. The back surface of these roofing materials usually has irregularities. However, since the pressure-sensitive adhesive film of the present invention has sufficient flexibility, it can follow the uneven surface and adhere thereto in close contact. In order to fully exert the effect of preventing the roof material from scattering, it is desirable to attach an adhesive film to the entire back surface portion corresponding to the exposed surface area of the roof material (area excluding the overlapping area of the roof materials). Alternatively, it may be attached to the entire back surface of the roof material.

[0014]

EXAMPLES Example 1 A base material of 80 μm polyolefin (polyethylene
Polypropylene) film (“FLJ-4002” manufactured by Sumitomo 3M Limited) is used, and an acrylic adhesive (“TM-287” manufactured by Toagosei Co., Ltd.) 1 is formed on the film.
"Denacol EX-4" manufactured by Nagase Kasei Co., Ltd.
21 "is added, and the film thickness after drying is 30
It was applied to have a thickness of μm. A back surface treatment agent (“JRD-8818” manufactured by Sumitomo 3M Limited) was applied to the opposite surface of the base material to obtain an adhesive film. The obtained adhesive film was slit into 100 mm × 100 mm, and stuck so as to fill the back surface of 100 mm × 100 mm of a slate material (“Piat Frize” manufactured by AR C Japan Co., Ltd.) which is a hard roof material. At this time, the adhesive film adhered sufficiently to the unevenness of the roofing material. This roofing material was dropped onto a concrete surface from a height of 2 m. The roofing material cracked into several pieces, but the film did not tear and remained as a whole as a whole, and the scattering prevention effect was obtained. Table 1 below shows the resin type of the base material, the thickness of the base material, the tensile strength when stretched by 5%, the conformability to the uneven surface of the roof material, the tear strength, the maximum load in the tear strength test, and the roof material drop test. Tear of the adhesive film and evaluation as an adhesive film for roofing materials are shown.

Example 2 A base material of 80 μm polyolefin (polyethylene
An adhesive film was prepared in the same manner as in Example 1 except that a polypropylene) film (“FLJ-384” manufactured by Sumitomo 3M Limited) was used, and a roof material drop test was performed. The results are shown in Table 1.

Example 3 An adhesive film was prepared in the same manner as in Example 1 except that a 100 μm polyethylene film (“MZ-180” manufactured by Tama Poly Co., Ltd.) was used as a substrate, and a roof material drop test was conducted. It was The results are shown in Table 1.

Example 4 An adhesive film was prepared in the same manner as in Example 1 except that a polyethylene terephthalate film having a thickness of 50 μm (“PET Emblet” manufactured by Unitika Ltd.) was used as a substrate, and a roof material drop test was conducted. I did. The results are shown in Table 1.

Example 5 An adhesive film was prepared in the same manner as in Example 1 except that a 70 μm polypropylene film (“P4748” manufactured by Toyobo Co., Ltd.) was used as the base material, and a roof material drop test was conducted. . The results are shown in Table 1.

Comparative Example 1 An adhesive film was prepared in the same manner as in Example 1 except that a 40 μm polypropylene film (“FOK-W” manufactured by Nimura Chemical Co., Ltd.) was used as a base material, and a roof material drop test was conducted. I did. The results are shown in Table 1.

Comparative Example 2 An adhesive film was produced in the same manner as in Example 1 except that a 50 μm ethylene vinyl acetate copolymer film (“SB-51” manufactured by Tama Poly Co., Ltd.) was used as a substrate.
A roof material drop test was conducted. The results are shown in Table 1.

Comparative Example 3 An adhesive film was prepared in the same manner as in Example 1 except that a 40 μm polypropylene film (“P2161” manufactured by Toyobo Co., Ltd.) was used as a base material, and a roof material drop test was conducted. . The results are shown in Table 1.

Comparative Example 4 An adhesive film was prepared in the same manner as in Example 1 except that a 16 μm polyethylene terephthalate film (“PET Emblet” manufactured by Unitika Ltd.) was used as the base material, and the roof material drop test was conducted. I did. The results are shown in Table 1.

[0023]

[Table 1]

From the above results, in the case of the adhesive film having the maximum load of 5 N or more in the tear strength test of the base material, tearing of the film is not observed when dropped, and the effect of preventing the roof material from scattering can be obtained. I understand. In addition, among those adhesive films, the tensile strength when stretched by 5% of the substrate is 80 N /
It can be seen that when the thickness is 25 mm or less, the adhesion to the roof material is high and a particularly high scattering prevention effect is obtained.

[0025]

The adhesive film for a hard roofing material of the present invention comprises:
It is possible to effectively prevent scattering of the roof material when it falls, and it is possible to easily attach the roof material.

[Brief description of drawings]

FIG. 1 shows a cross-sectional view of one embodiment of an adhesive film for a hard roofing material of the present invention.

[Explanation of symbols]

10 ... Adhesive film for hard roofing material 1 ... Base material 2 ... Adhesive layer 3 ... Back treatment agent

Continued front page    (72) Inventor Satoru Takinami             Sumitomo 3-8-8 Minami-Hashimoto, Sagamihara City, Kanagawa Prefecture             Within 3M Co., Ltd. (72) Inventor Norihito Kondo             Sumitomo 3-8-8 Minami-Hashimoto, Sagamihara City, Kanagawa Prefecture             Within 3M Co., Ltd. F-term (reference) 2E108 CC16 CV06 GG05

Claims (2)

[Claims] 1. A film for a hard roof material to be attached to an installation surface of a hard roof material, wherein the film comprises a base material and an adhesive, and the machine direction (MD) and the transverse direction (CD) of the base material. The maximum load (Tr × t) in the tear strength test, which is obtained by multiplying the tear strength (Tr) of Example 1 by the thickness (t) of the base material, is 5 Newtons (N) or more, the adhesive film for a hard roofing material. 2. The substrate has a tensile strength of 80 N / 2 when stretched by 5% as measured by JIS-Z-0237.
It is 5 mm or less, The adhesive film for hard roof materials of Claim 1 characterized by the above-mentioned.