JP4976351B2 - Butyl rubber-based pressure-sensitive adhesive composition, pressure-sensitive adhesive tape using the butyl rubber-based pressure-sensitive adhesive composition, roof waterproof sheet and joined body using the butyl rubber-based pressure-sensitive adhesive composition or the pressure-sensitive adhesive tape - Google Patents

Description

  The present invention relates to a butyl rubber-based pressure-sensitive adhesive composition. More specifically, the present invention relates to a butyl rubber-based pressure-sensitive adhesive composition for use in joining a roof tile and a waterproof sheet, a pressure-sensitive adhesive tape using the butyl rubber-based pressure-sensitive adhesive composition, and the butyl rubber-based pressure-sensitive adhesive composition or The present invention relates to a waterproof sheet for a roof and a joined body using the adhesive tape.

  Generally, on a roof of a building such as a house, a waterproof sheet made of synthetic rubber or the like is laid between a roof base and a roof tile in order to prevent intrusion of rainwater and the like. For joining the waterproof sheet and the roof tile, there are mechanical fastening methods such as nails, bolts, rivets, etc., a joining method using a solvent-based adhesive, or a joining method using an acrylic rubber or butyl rubber adhesive tape. It is used.

  Among these, alignment methods using rubber-based adhesive tape are often used from the viewpoint of water resistance and workability, etc., but when the entire roof is exposed to high temperatures due to strong sunlight in summer, the adhesive There was a problem that the tape was subject to creep deformation due to heat.

  As means for solving these problems, for example, Patent Document 1 proposes an adhesive tape that improves creep resistance by copolymerizing an amino group-containing ethylenically unsaturated monomer and an epoxy group-containing ethylenically unsaturated monomer. ing. However, since the amino group and the epoxy group react with time, there is a problem that the storage stability is insufficient.

  Patent Document 2 and Patent Document 3 include a pressure-sensitive adhesive tape that prevents creep deformation by bonding and curing a pressure-sensitive adhesive tape containing a polymerization initiator and a pressure-sensitive adhesive tape containing a polymerization accelerator at the time of joining. Proposed. However, this adhesive tape requires two tapes, which increases the number of processing steps for forming the two sheets and increases the material for the two sheets, resulting in production costs and production time. There was a problem that increased. Moreover, since it is necessary to stick together two tapes at the time of construction, there existed a problem that workability | operativity fell.

  As an example of a specific prior art for joining a roof tile and a waterproof sheet, for example, Patent Document 4 proposes a method of joining a roof tile and a waterproof sheet using a butyl rubber-based adhesive tape. However, conventional butyl rubber-based adhesive tapes cannot be said to have sufficient creep resistance at high temperatures and long-term adhesion to ceramic tiles, and further development has been expected.

Japanese Patent Laid-Open No. 6-1000084 JP-A-4-300989 JP-A-6-122856 JP 2004-300674 A

  As described above, in joining the roof tile and the waterproof sheet, a technique for improving the creep resistance at a high temperature of the pressure-sensitive adhesive to be used is indispensable for increasing the temperature of the entire roof due to sunlight irradiation or the like. In addition, since roofs covered with ceramic tiles are generally inclined, a technique for improving long-term adhesion to ceramic tiles is indispensable.

  Therefore, the main object of the present invention is to provide a pressure-sensitive adhesive composition for a tile roof that can be used for joining a roof tile and a waterproof sheet and has improved creep resistance and long-term adhesion at high temperatures. .

  As a result of searching for various substances that can be blended in the pressure-sensitive adhesive composition for tile roofs in order to solve the above problems, the inventors of the present application have not been included in the conventional pressure-sensitive adhesive compositions for tile roofs. By blending a specific substance, a technique for dramatically improving creep resistance and long-term adhesiveness at high temperatures has been found, and the present invention has been completed.

In the present invention, first, an adhesive composition for use in fixing a tile roof,
(1) 100 parts by weight of butyl rubber;
(2) 0.2 to 5 parts by mass of a silane coupling agent,
(3) 2 to 35 parts by mass of polyethylene,
A butyl rubber-based pressure-sensitive adhesive composition for tiled roofs, comprising:
Although the kind of roof tile which can be fixed using the butyl rubber-based pressure-sensitive adhesive composition according to the present invention is not particularly limited, in the present invention, it can be suitably used for fixing a ceramic roof tile.
Moreover, although the property of (2) polyethylene contained in the butyl rubber-based pressure-sensitive adhesive composition according to the present invention is not particularly limited, it is preferable to use polyethylene having a property that the Vicat softening point is 90 ° C. or less.
The butyl rubber-based pressure-sensitive adhesive composition according to the present invention can achieve the object of the present invention as long as it contains the substances (1) to (3). As for 180 degree adhesive strength after 14-week exposure at 90 degreeC, it is preferable that it is 30 N / 25mm or more.

If the butyl rubber adhesive composition according to the present invention is processed into a tape shape, it can be used as an adhesive tape for tiled roofs.
Moreover, the butyl rubber-type adhesive composition which concerns on this invention can be used suitably for the said adhesive layer of the waterproof sheet for roofs which consists of an adhesive layer and the waterproof sheet laminated | stacked on this adhesive layer.
The roof waterproof sheet may be formed by laminating an adhesive tape obtained by processing the butyl rubber adhesive composition according to the present invention into a tape shape and a waterproof sheet.

  The present invention further provides a joined body of a roof tile and a waterproof sheet joined together using the adhesive tape.

  The butyl rubber-based pressure-sensitive adhesive composition according to the present invention has realized a dramatic improvement in creep resistance and long-term pressure-sensitive adhesiveness at high temperatures. As a result, the durability in joining the roof tile and the waterproof sheet is improved, and as a result, the durability of the entire roof can be improved.

  Hereinafter, preferred embodiments for carrying out the present invention will be described. In addition, embodiment described below shows an example of typical embodiment of this invention, and, thereby, the range of this invention is not interpreted narrowly.

<Butyl rubber adhesive composition>
The butyl rubber-based pressure-sensitive adhesive composition according to the present invention is roughly divided into (1) butyl rubber, (2) a silane coupling agent, and (3) polyethylene. The butyl rubber-based pressure-sensitive adhesive composition according to the present invention can be used for fixing various types of tile roofs. For example, it is used regardless of the type of tiles, such as ceramic tiles (glaze tiles) with glassy surfaces, glazed tiles, carbon glaze tiles, salt-fired tiles, cement tiles, etc., with a carbon film mainly composed of carbon on the surface. However, in the present invention, it can be suitably used for fixing ceramic tiles. Hereinafter, each component will be described in detail.

(1) Butyl rubber The butyl rubber adhesive composition according to the present invention contains butyl rubber. This is because the pressure-sensitive adhesive using butyl rubber has little change over time in adhesive force, maintains high adhesiveness, has good water resistance, and has good workability. Moreover, since the followability to a to-be-adhered body is also favorable, it is because it can use very suitably for joining of the to-be-adhered bodies from which a form differs, such as a roof tile and a waterproof sheet.

(2) Silane coupling agent The butyl rubber-based pressure-sensitive adhesive composition according to the present invention contains a silane coupling agent. In the present invention, the butyl rubber-based pressure-sensitive adhesive composition contains a silane coupling agent, thereby succeeding in improving long-term adhesion (adhesive strength) to ceramic tiles.

  The kind of the silane coupling agent that can be used in the butyl rubber-based pressure-sensitive adhesive composition according to the present invention is not particularly limited as long as the object of the present invention is not impaired, and any known silane coupling agent may be used alone or in combination. More than one species can be freely selected and used. For example, vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxy Silane, p-styryltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-acryloxy Propyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, N-2- (aminoethyl)- -Aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine, N-phenyl-3-amino Propyltrimethoxysilane, 3-ureidopropyltriethoxysilane, 3-chloropropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, bis (triethoxysilylpropyl) tetrasulfide, 3-isocyanate Examples thereof include propyltriethoxysilane and the like having two or more hydrolyzable silanols in the molecule. Of these, 3-mercaptopropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, and N-2- (aminoethyl) -3-aminopropyltrimethoxysilane are particularly preferred in the present invention. This is because these silane coupling agents have good compatibility with butyl rubber.

  In the butyl rubber-based pressure-sensitive adhesive composition according to the present invention, the amount of the silane coupling agent is 0.2 to 5 parts by mass with respect to 100 parts by mass of butyl rubber in order to sufficiently exhibit long-term adhesion (adhesive strength). Set to. If it is less than 0.2 parts by mass, the long-term adhesion (adhesive strength) to the ceramic tile may be insufficient, and if it exceeds 5 parts by mass, an adhesive tape prepared using a butyl rubber-based adhesive composition It is because it may be softened and the creep resistance may be lowered. In particular, in order to further improve long-term adhesion (adhesive strength) in the present invention, the content is more preferably 0.5 to 2 parts by mass.

(3) Polyethylene The butyl rubber pressure-sensitive adhesive composition according to the present invention contains polyethylene. In the present invention, by including polyethylene in the butyl rubber-based pressure-sensitive adhesive composition, the creep resistance particularly at high temperatures has been greatly improved.

  The type of polyethylene that can be used in the butyl rubber-based pressure-sensitive adhesive composition according to the present invention is not particularly limited as long as the object of the present invention is not impaired, and any known polyethylene can be freely selected from one or more types. Can be used. For example, a low density polyethylene (LDPE), a linear short chain branched polyethylene (LLDPE), a high density polyethylene (HDPE), etc. can be mentioned.

  The polyethylene that can be used in the butyl rubber-based pressure-sensitive adhesive composition according to the present invention is not particularly limited in its properties as long as the object of the present invention is not impaired. In the present invention, the Vicat softening point is 90 ° C. or lower. Those are preferred. When the Vicat softening point of polyethylene exceeds 90 ° C., dispersion in butyl rubber may be insufficient, and the adhesiveness of an adhesive tape prepared using a butyl rubber-based adhesive composition may decrease. is there.

  In the butyl rubber-based pressure-sensitive adhesive composition according to the present invention, the blending amount of polyethylene is set to 2 to 35 parts by mass with respect to 100 parts by mass of butyl rubber in order to sufficiently exhibit the creep resistance at high temperatures. If it is less than 2 parts by mass, the creep resistance at high temperatures may be insufficient, and if it exceeds 35 parts by mass, the adhesiveness of an adhesive tape prepared using a butyl rubber-based adhesive composition may be reduced. It is. In particular, in the present invention, in order to further improve the creep resistance at high temperatures, the content is more preferably 5 to 25 parts by mass.

  The butyl rubber-based pressure-sensitive adhesive composition according to the present invention described above includes (a) a reinforcing agent such as carbon black and (b) an inorganic filler that are used in ordinary rubber compositions as long as the object of the present invention is not impaired. , Fillers, (c) softeners, plasticizers, (d) pressure-sensitive adhesives, anti-aging agents, processing aids, lubricants, and the like can be freely added. The main additives will be described below.

(A) Carbon black The carbon black that can be used in the butyl rubber-based pressure-sensitive adhesive composition according to the present invention is not particularly limited as long as the object of the present invention is not impaired. Two or more kinds can be freely selected and used. Examples thereof include hard carbon such as SAF, ISAF, and HAF, and soft carbon such as FEF, GPF, SRF, FT, and MT.

(B) Inorganic filler The inorganic filler that can be used in the butyl rubber-based pressure-sensitive adhesive composition according to the present invention is not particularly limited as long as the purpose of the present invention is not impaired, and any known inorganic filler may be used. One or more kinds can be freely selected and used. For example, silica, diatomaceous earth, alumina, zinc oxide, magnesium oxide, calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, calcium silicate, talc, mica, bentonite, activated clay, glass fiber, glass beads, aluminum nitride, carbon fiber, And so on.

(C) Softener / Plasticizer The butyl rubber-based pressure-sensitive adhesive composition according to the present invention can contain a softener and a plasticizer for the adjustment of moldability. The kind of the softener and plasticizer that can be used in the butyl rubber-based pressure-sensitive adhesive composition according to the present invention is not particularly limited as long as the purpose of the present invention is not impaired, and one kind of all known softeners and plasticizers is used. Alternatively, two or more kinds can be freely selected and used. Examples thereof include paraffinic, naphthenic, aroma-based process oil, rapeseed oil, phthalic acid esters, adipic acid esters, alkyl sulfonic acid esters, and sebacic acid esters.

(D) Adhesive The butyl rubber adhesive composition according to the present invention can contain an adhesive other than the butyl rubber adhesive in order to further improve the adhesiveness. The type of the pressure-sensitive adhesive other than the butyl rubber-based pressure-sensitive adhesive that can be used in the butyl rubber-based pressure-sensitive adhesive composition according to the present invention is not particularly limited as long as the object of the present invention is not impaired. Alternatively, two or more kinds can be freely selected and used. Examples thereof include coumarone resin, phenol resin, terpene resin, phenol formaldehyde resin, petroleum hydrocarbon resin, rosin resin, polybutene, and asphalt.

  The butyl rubber-based pressure-sensitive adhesive composition according to the present invention described above can achieve the object of the present invention as long as it contains each of the above-mentioned constituents, but as an index, after exposure at 90 ° C. for 7 weeks. The 180 ° adhesive strength is preferably 30 N / 25 mm or more, and the 180 ° adhesive strength after exposure for 14 weeks is more preferably 30 N / 25 mm or more.

  Also, the adhesive composition for tile roof processed into a shape of width 25 mm × length 80 mm is bonded between two stainless plates of 100 mm × 25 mm × 0.5 mmt, and a weight of 50 g is applied to one of the stainless plates. It is preferable that the deviation length of the stainless steel plate when suspended at 1 ° C. for 1 hour is 10 mm or less.

<Adhesive tape>
The butyl rubber-based pressure-sensitive adhesive composition according to the present invention can be suitably used for pressure-sensitive adhesive tapes for tile roofs. For example, each of the components that can be contained in the above-described butyl rubber-based pressure-sensitive adhesive composition according to the present invention is kneaded using a kneading apparatus or the like, and the kneaded material is formed into a tape shape so that both sides are adhesive roof It can be used as an adhesive tape.

  The kneading apparatus used when kneading each component is not particularly limited, and kneading can be performed by freely selecting a known kneading apparatus. Examples thereof include kneading apparatuses such as a Banbury mixer, a kneader mixer, and a two roll.

  A forming method for forming the kneaded material in a tape shape is not particularly limited, and a known forming method can be freely selected and used. For example, there can be mentioned molding methods such as roll molding and extrusion molding.

  Since the pressure-sensitive adhesive tape according to the present invention uses the above-described butyl rubber-based pressure-sensitive adhesive composition according to the present invention, the creep resistance and long-term adhesion at high temperatures are high. Therefore, the durability of the joined body in which the roof tile and the waterproof sheet are joined using the adhesive tape according to the present invention can also be improved.

<Waterproof sheet for roof>
The waterproof sheet for roof according to the present invention is roughly divided into (1) an adhesive layer and (2) a waterproof sheet. Each configuration will be described below.

(1) Pressure-sensitive adhesive layer The pressure-sensitive adhesive layer is composed of the butyl rubber-based pressure-sensitive adhesive composition according to the present invention described above. Since the details of the butyl rubber-based pressure-sensitive adhesive composition are as described above, description thereof is omitted here.

  In addition, it is also possible to use the adhesive tape mentioned above as this adhesive bond layer.

(2) Waterproof sheet In the waterproof sheet for roofs according to the present invention, a waterproof sheet is laminated on the pressure-sensitive adhesive layer. The material used for the waterproof sheet that can be used for the waterproof sheet for roof according to the present invention is not particularly limited as long as the object of the present invention is not impaired, and one or more known materials can be freely selected. Can be used. Examples thereof include ethylene-propylene-diene rubber (EPDM) and polyvinyl chloride (PVC). Among these, in the present invention, a waterproof sheet using ethylene-propylene-diene rubber (EPDM) is particularly preferable. This is because the adhesiveness with the butyl rubber adhesive is good.

  Hereinafter, the present invention will be described in more detail based on examples. In addition, the Example demonstrated below shows an example of the typical Example of this invention, and, thereby, the range of this invention is not interpreted narrowly.

The “parts” in this example are based on mass standards. Details of the materials used in this example are shown below.
(1) Butyl rubber: “Butyl # 268” manufactured by Nippon Butyl Co., Ltd.
(2) Silane coupling agent: 3-glycidoxypropyltriethoxysilane (“KBE-403” manufactured by Shin-Etsu Silicone Co., Ltd.), 3-mercaptopropyltrimethoxysilane (“KBM-803” manufactured by Shin-Etsu Silicone Co., Ltd.) )
(3) Polyethylene: “PES-20” (Vicat softening point: 75 ° C.) manufactured by Nihon Unicar Co., Ltd., “NUC-8505” (Vicat softening point: 95 ° C.) manufactured by Nihon Unicar Co., Ltd.
(4) Calcium carbonate: “TA044” manufactured by Chichibu Lime Industry Co., Ltd.
(5) Carbon black: “Asahi # 51” manufactured by Asahi Carbon Co., Ltd.
(6) Process oil: “AH-16” manufactured by Idemitsu Kosan Co., Ltd.
(7) Terpene adhesive: “YS Oil D” manufactured by Yasuhara Chemical Co., Ltd.
(8) Holy Ten: “HV-300” manufactured by Nippon Oil Corporation

<Production of adhesive tape>
[Example 1]
According to the blending amounts shown in Table 1 below, (1) butyl rubber, (2) silane coupling agent, (3) polyethylene, (4) calcium carbonate, (5) carbon black, (6) process oil, (7) terpene The kneaded product was obtained by kneading the system pressure-sensitive adhesive, (8) Hoributen, at 110 ° C. for 1 hour using a 3 liter kneader mixer. Furthermore, the obtained kneaded material was processed into a tape shape having a width of 25 mm and a thickness of 1 mm with an extruder set at a die temperature of 70 ° C., to produce an adhesive tape of Example 1.

[Example 2]
In Example 1, instead of adding 0.3 parts by mass of the silane cockling agent KBM-803, an adhesive tape was prepared in the same manner except that 1.5 parts by mass of the silane coupling agent KBM-403 was added.

[Example 3]
In Example 1, instead of adding 0.3 part by mass of the silane coupling agent KBM-803, an adhesive tape was prepared in the same manner except that 1.5 part by mass was added.

[Example 4]
In Example 1, instead of adding 0.3 part by mass of the silane coupling agent KBM-803, an adhesive tape was prepared in the same manner except that 3 parts by mass was added.

[Example 5]
In Example 3, instead of adding 20 parts by mass of polyethylene PES-20, an adhesive tape was prepared in the same manner except that 5 parts by mass was added.

[Example 6]
In Example 3, instead of adding 20 parts by mass of polyethylene PES-20, an adhesive tape was prepared in the same manner except that 30 parts by mass was added.

[Example 7]
In Example 3, instead of adding 20 parts by mass of polyethylene PES-20, an adhesive tape was prepared in the same manner except that 20 parts by mass of polyethylene NUC-8505 was added.

[Example 8]
In Example 3, instead of adding 1.5 parts by mass of the silane coupling agent KBM-803, an adhesive tape was prepared in the same manner except that 0.2 parts by mass was added.

[Example 9]
In Example 3, instead of adding 1.5 parts by mass of the silane coupling agent KBM-803, an adhesive tape was prepared in the same manner except that 5 parts by mass was added.

[Example 10]
In Example 3, instead of adding 20 parts by mass of polyethylene PES-20, an adhesive tape was prepared in the same manner except that 2 parts by mass was added.

[Example 11]
In Example 3, instead of adding 20 parts by mass of polyethylene PES-20, an adhesive tape was prepared in the same manner except that 35 parts by mass was added.

[Comparative Example 1]
In Example 3, an adhesive tape was produced in the same manner without blending a silane coupling agent.

[Comparative Example 2]
In Example 3, an adhesive tape was prepared in the same manner without blending polyethylene.

[Comparative Example 3]
In Example 3, a pressure-sensitive adhesive tape was produced in the same manner without blending a silane coupling agent and polyethylene.

[Comparative Example 4]
In Example 3, instead of adding 1.5 parts by mass of the silane coupling agent KBM-803, an adhesive tape was prepared in the same manner except that 0.1 parts by mass was added.

[Comparative Example 5]
In Example 3, instead of adding 1.5 parts by mass of the silane coupling agent KBM-803, an adhesive tape was prepared in the same manner except that 10 parts by mass was added.

[Comparative Example 6]
In Example 3, instead of adding 20 parts by mass of polyethylene PES-20, an adhesive tape was prepared in the same manner except that 1 part by mass was added.

[Comparative Example 7]
In Example 3, instead of adding 20 parts by mass of polyethylene PES-20, an adhesive tape was prepared in the same manner except that 50 parts by mass was added.

<Evaluation of each characteristic>
About the adhesive tape which concerns on Examples 1-11 and Comparative Examples 1-7, according to the following measuring method, each characteristic was evaluated. The evaluation results are shown in Tables 1 and 2.

[Adhesive force]
Adhering the prepared adhesive tapes according to Examples 1 to 11 and Comparative Examples 1 to 7 to a slope with an inclination angle of 30 ° by the ball rolling method defined in JIS Z0237, and a condition of 23 ° C. and relative humidity 65% Below, stainless steel balls of various diameters were rolled on the runway 100 mm, and the maximum ball diameter (in inches) that stopped for 5 seconds or more within the adhesive surface of 100 mm was measured. Further, a ball number obtained by multiplying the obtained ball diameter by 32 was used as an index of adhesive strength.

[Long-term durability at high temperatures]
Bonding test of adhesive tapes according to Examples 1 to 11 and Comparative Examples 1 to 7 processed into a shape of width 25 mm × length 100 mm × thickness 1 mm to a ceramic tile processed into a shape of width 25 mm × length 125 mm I got a piece. This was left in a 90 ° C. oven for 7 and 14 weeks, and after removal, the tape was peeled off in the 180 ° direction at a speed of 300 mm / min at 23 ° C. and a relative humidity of 65%. The adhesive strength was measured.

[Creep resistance]
Adhesive tapes according to Examples 1 to 11 and Comparative Examples 1 to 7 processed into a shape of width 25 mm × length 80 mm were bonded between two stainless steel plates (SUS304: 100 mm × 25 mm × 0.5 mmt). A weight of 50 g was hung on one stainless steel plate, and the deviation length of the stainless steel plate after 1 hour at 70 ° C. was measured.

[Vicat softening point]
First, a plate-shaped test piece having a length of 30 mm, a width of 19 mm, and a thickness of 3.2 mm is molded by injection molding, and then left for 24 hours in a thermostatic chamber at a temperature of 23 ° C. ± 2 ° C. and a relative humidity of 50% ± 5%. The condition was adjusted. Using a 5 kg weight, the temperature was increased at a rate of temperature increase of 50 ° C./hr, and the temperature when the indenter entered 1 mm into each test piece was measured. The test was performed three times, and the average value was defined as the Vicat softening point. For the measurement, a Vicat softening point tester (manufactured by Toyo Seiki Co., Ltd., trade name: VSP tester) was used.

  As shown in Table 1, all of the pressure-sensitive adhesive tapes according to Examples 1 to 11 have well-balanced characteristics that satisfy the ball rolling adhesive strength, the 180 ° adhesive strength after 90 ° C. exposure, and the creep deviation length. I found out.

  Particularly, the adhesive tapes according to Examples 1 to 6 and 8 to 11 each have a 180 ° adhesive strength after 90 ° C. and 7 weeks of 30 N / 25 mm or more, and further, Examples 1 to 5 and 8 to 10 About the adhesive tape, the 180 degree adhesive force after 90 degreeC and 14 weeks was also 30 N / 25mm or more. Moreover, also about the creep shift | offset | difference length, especially the adhesive tape which concerns on Examples 1-9, 11 was as favorable as 10 mm or less.

  On the other hand, as shown in Table 2, it was found that each comparative example did not achieve the object of the present invention in the following points.

(1) Comparative Example 1
Since the adhesive tape which concerns on the comparative example 1 did not contain the silane coupling agent, it turned out that the 180 degree adhesive force after 90 degreeC and 7 weeks and 14 weeks is inferior.

(2) Comparative Example 2
Since the adhesive tape which concerns on the comparative example 2 does not contain polyethylene, it turned out that creep deviation length will become large.

(3) Comparative Example 3
Since the pressure-sensitive adhesive tape according to Comparative Example 3 does not contain a silane coupling agent and polyethylene, the 180 ° pressure-sensitive adhesive strength after 90 ° C, 7 weeks and 14 weeks is inferior, and the creep deviation length is also increased. I understood.

(4) Comparative Example 4
The pressure-sensitive adhesive tape according to Comparative Example 4 has a content of the silane coupling agent of less than 0.2 parts by mass, and thus the adhesive strength after exposure at 90 ° C. has been remarkably reduced.

(5) Comparative Example 5
The pressure-sensitive adhesive tape according to Comparative Example 5 was found that the content of the silane coupling material exceeds 5 parts by mass, so that the tape becomes too soft and the creep deviation length becomes large.

(6) Comparative Example 6
The pressure-sensitive adhesive tape according to Comparative Example 6 has a polyethylene content of less than 2 parts by mass.

(7) Comparative Example 7
The pressure-sensitive adhesive tape according to Comparative Example 7 was found to have poor adhesive strength because the polyethylene content exceeded 35 parts by mass.

  As a result of this example, it was found that the butyl rubber-based pressure-sensitive adhesive can contain both a silane coupling agent and polyethylene in combination to improve both creep resistance at high temperatures and long-term pressure-sensitive adhesiveness. Moreover, as for the suitable compounding quantity of a silane coupling agent and polyethylene, the compounding quantity of a silane coupling agent is 0.2-5 mass parts and the compounding quantity of polyethylene is 2-35 mass parts with respect to 100 mass parts of butyl rubber. I understood that.

Claims (8)

An adhesive composition for use in fixing a tile roof,
(1) 100 parts by weight of butyl rubber;
(2) 0.2 to 5 parts by mass of a silane coupling agent,
(3) 2 to 35 parts by mass of polyethylene,
A butyl rubber-based pressure-sensitive adhesive composition for tile roofs, comprising:   The butyl rubber-based pressure-sensitive adhesive composition according to claim 1, wherein the tile is a ceramic tile.   (2) The butyl rubber adhesive composition according to claim 1 or 2, wherein the Vicat softening point of polyethylene is 90 ° C or lower.   The butyl rubber-based pressure-sensitive adhesive composition according to any one of claims 1 to 3, wherein the 180-degree adhesive strength after exposure for 14 weeks at 90 ° C is 30 N / 25 mm or more.   An adhesive tape obtained by processing the butyl rubber-based adhesive composition according to any one of claims 1 to 4 into a tape shape. An adhesive layer comprising the butyl rubber-based adhesive composition according to any one of claims 1 to 4,
A waterproof sheet laminated on the adhesive layer;
A waterproof sheet for roofs. The pressure-sensitive adhesive tape according to claim 5;
A waterproof sheet laminated on the adhesive and the like;
A waterproof sheet for roofs. A joined body of a roof tile and a waterproof sheet joined using the adhesive tape according to claim 5.