JP2002129843A - Waterproofing method for opening part section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproofing method capable of executing the connection of opening part frame members in a short time with hardly having a dispersion. SOLUTION: This waterproofing method for opening part section comprises peeling a part of the release material layer of a small piece-like waterproofing adhesive tape comprising a transparent or translucent base material tape 1, a self-adhesive transparent or translucent adhesive layer 2 and the release material layer 36, which are laminated in this order, sticking the exposed adhesive layer 2 to a body 61 of opening part frame member, preparing another body to the body of opening part frame member followed by positioning, and sticking the adhesive layer exposed by releasing the remaining part of the release material layer to the another body of opening part frame member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing method around an opening which is preferably used when an opening frame such as an aluminum sash or a wooden sash is assembled and fitted to an opening in a structure such as a house. .

[0002]

2. Description of the Related Art Conventionally, in buildings such as houses, aluminum sashes and wooden sashes are employed around openings such as windows and doors. These have a structure in which four sash members are mainly combined in a square shape, but their joints are fitted with a waterproof material such as rubber packing to prevent infiltration of rainwater, etc. Construction has been done for

However, the method using a waterproof material such as a rubber packing tends to cause construction failure such as displacement when combining sash members at a construction site, and cannot always provide a sufficient waterproofing treatment. As means for solving such construction failure, polysulfide-based, silicone-based,
It is also known to use a polyurethane-based sealing agent to fill gaps between joints between sash members, for example. However, since these sealing agents generally involve the use of a solvent, they pose a problem of contaminating the working environment. In addition, because of the paste form, it often takes about one to two days for curing, and the sealing agent that has been carelessly applied to hands or clothes is further attached to other parts of the work site. There was a case.

As a waterproofing means in place of a sealing agent, a waterproofing tape obtained by laminating a rubberized asphalt composition on a base cloth obtained by laminating one side of a non-woven fabric made of a synthetic fiber with a thermoplastic resin (Japanese Patent Application Laid-Open No. Sho 61-1986) And a waterproof tape such as a butyl-based adhesive in which a nonwoven fabric or a synthetic resin film is laminated on one surface.

[0005] However, these waterproof tapes are generally in the form of a roll or a long sheet, and when actually used on site, an operator may use these waterproof tape cutters or scissors at the time of construction. Since it is cut to an appropriate size and attached to the joint, there is a problem that in addition to poor workability, there is a large variation in work quality between workers. In addition, since these adhesive tapes have a black adhesive layer, it is difficult to visually check the presence or absence of pressure bonding of the tape. In some cases, contamination of the surrounding area caused a problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the problem of the conventional waterproof construction when the opening frame such as the sash is assembled by combining members, and the joining of the members of the opening frame is performed by the following method.
It is an object of the present invention to provide a waterproof construction method that has little variation and can be performed in a short time.

[0007]

In order to achieve the above object, the present invention according to claim 1 comprises a transparent or translucent base tape, a self-adhesive transparent or translucent pressure-sensitive adhesive layer, A piece of waterproof adhesive tape in which a release material is laminated in this order, the pressure-sensitive adhesive layer which has been peeled off and partially exposed to the release material layer is attached to the main body of the opening frame member, and then the opening frame Preparing and positioning a separate body with respect to the main body of the member, a waterproofing construction method around the opening where the remaining adhesive layer is peeled off and the exposed adhesive layer is attached to the separate body of the opening frame member. provide.

According to a second aspect of the present invention, there is provided a waterproofing method around an opening according to the first aspect, wherein a small piece of waterproof adhesive tape is used in which a release material layer is previously divided into two. Claim 3
In the present invention described above, the pressure-sensitive adhesive layer having self-adhesiveness is an alkyl (meth) acrylate having an alkyl group having 11 to 18 carbon atoms in an amount of 5 to 60% by weight and an alkyl having a alkyl group having 4 to 10 carbon atoms. 3. A method for waterproofing around an opening according to claim 1, which is an acrylic pressure-sensitive adhesive layer containing an acrylic copolymer obtained by copolymerizing 40 to 95% by weight of (meth) acrylate.

[0009] The transparent or translucent base tape used in the present invention is not limited as long as it is light-transmitting or light-scattering. For example, Japanese paper or a material such as polyethylene, polypropylene, or polyether may be used. A material having light scattering properties by forming a crystalline portion and an amorphous portion may be used. The total light transmittance and the haze value of the laminate of the transparent or translucent base tape and the transparent or translucent pressure-sensitive adhesive layer are not limited, but the total light transmittance is 20% or more, and It is particularly preferable that the value be in the range of 30 to 90% in order to visually confirm the state of close contact with the adherend.

The base tape preferably has elasticity and strength from the viewpoint of joining the opening frame members, and the base tape has a thickness of 0.02 to 1.00 mm.
Is preferred.

The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer of the small-sized waterproof pressure-sensitive adhesive tape used in the present invention is light-transmitting or light-scattering, has a property of following irregularities such as joints, and has a waterproof property. The adhesive is not particularly limited as long as it exerts an effect, and for example, a suitable adhesive such as a rubber-based, silicone-based, or acrylic-based adhesive is widely used. In particular, an acrylic pressure-sensitive adhesive is preferably used because it can easily control rubber elasticity and tackiness (tack) by crosslinking to cope with cold flow and shear stress in summer.

Such an acrylic pressure-sensitive adhesive comprises an alkyl (meth) acrylate having an alkyl group having 11 to 18 carbon atoms and an alkyl (meth) acrylate having an alkyl group having 4 to 10 carbon atoms. A main component is an acrylic copolymer obtained by polymerization, and preferably, an acrylic copolymer obtained by copolymerizing the alkyl (meth) acrylate or the like with another modified vinyl monomer is used. It is the main component.

In the present invention, for example, alkyl (meth) acrylate means alkyl acrylate or / and
And alkyl methacrylate.

The alkyl (meth) acrylate having an alkyl group having 11 to 18 carbon atoms includes lauryl (meth) acrylate, myristyl (meth) acrylate, isomyristyl (meth) acrylate, isononyl (meth) acrylate, and palmityl (Meth) acrylate, stearyl (meth) acrylate and the like,
These can be used alone or in combination.

As the alkyl (meth) acrylate having an alkyl group having 4 to 10 carbon atoms, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-octyl (meth) acrylate , Nonyl (meth) acrylate, decyl (meth) acrylate, and the like, which can be used alone or in combination.

Examples of the modified vinyl monomer include a carboxyl group-containing monomer such as acrylic acid, maleic acid, fumaric acid, and itaconic acid or an anhydride thereof, acrylonitrile, N-vinylpyrrolidone, Nitrogen-containing monomers such as N-vinylcaprolactam, acrylloylmorpholine, (meth) acrylamide, dimethylaminoethyl acrylate, dimethylaminopropyl acrylamide, 2-hydroxyethyl (meth)
Monomers having a hydroxyl group such as acrylate, 2-hydroxybutyl acrylate, caprolactone-modified (meth) acrylate, polyoxyethylene (meth) acrylate, and polyoxypropylene (meth) acrylate are exemplified.

Further, the acrylic copolymer has an alkyl (meth) acrylate having an alkyl group having 11 to 18 carbon atoms and an alkyl (meth) acrylate having an alkyl group having 4 to 10 carbon atoms. Polymerized,
An olefin polymer having a polymerizable unsaturated double bond at the terminal may be copolymerized to increase the adhesion to polyolefin.

The olefin polymer having a polymerizable unsaturated double bond at the terminal is not particularly limited as long as it has a polymer structure comprising a polymerizable double bond portion and an olefin skeleton at the terminal. Instead, examples of the olefin skeleton include an ethylene butylene random copolymer and an ethylene-propylene copolymer.

The acrylic pressure-sensitive adhesive layer has 11 carbon atoms.
Acrylic copolymer obtained by copolymerizing 5 to 60% by weight of an alkyl (meth) acrylate having an alkyl group of 18 to 18 and 40 to 95% by weight of an alkyl (meth) acrylate having an alkyl group of 4 to 10 carbon atoms. When composed of an acrylic adhesive containing a polymer as a main component, it maintains sufficient flexibility at room temperature, has self-healing properties accompanying self-adhesion, has excellent ability to follow uneven surfaces, etc., and is a sealing tape. And exhibit particularly excellent characteristics.

The amount of the alkyl (meth) acrylate having an alkyl group having 11 to 18 carbon atoms is out of the range of 5 to 60% by weight, or the amount of the alkyl (meth) acrylate having an alkyl group having 4 to 10 carbon atoms is 40% by weight. When the content is out of the range of 95% by weight, for example, good followability to uneven surfaces may not be obtained.

More preferred acrylic copolymer is alkyl (meth) having an alkyl group having 11 to 18 carbon atoms.
5 to 40% by weight of acrylate and alkyl (meth) acrylate having an alkyl group having 4 to 10 carbon atoms
95% by weight.

The acrylic copolymer can be obtained by a conventionally known method such as solution polymerization, bulk polymerization, emulsion polymerization, pearl polymerization and the like. In the bulk polymerization, a photopolymerization method using ultraviolet rays is preferable in that a uniform polymer is easily obtained. In this case, a photopolymerization initiator is used.

Examples of the photopolymerization initiator include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone (Darocur 2959: manufactured by Merck); α-hydroxy-α, α'-dimethyl-acetophenone Acetophenones such as [Darocur 1173: Merck]; methoxyacetophenone, 2,2 dimethoxy-2-phenylacetophenone [Irgacure 651: Ciba-Geigy], 2-hydroxy-2-cyclohexylacetophenone [Irgacure 184: Ciba-Geigy] And ketals such as benzyldimethyl ketal, halogenated ketones, acylphosphinoxides, acylphosphonates and the like.

The acrylic copolymer is preferably crosslinked, since it can ensure the shearing adhesive strength and the like when the piece-shaped waterproof adhesive tape is adhered to the opening frame member. The method may be any of conventionally known methods, and examples thereof include isocyanate crosslinking, epoxy crosslinking, and aziridine crosslinking. Further, the acrylic monomer mixture may be irradiated with ultraviolet rays to perform bulk polymerization. The gel fraction when the crosslinked acrylic copolymer is immersed and dissolved in a solvent is preferably, for example, about 35 to 80%, and 40 to 80%.
About 70% is more preferable.

When obtained by UV bulk polymerization, a copolymerizable unsaturated double bond is incorporated into the molecule in order to form a crosslinked product.
Such as hexanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaery Stall di (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane trimethacrylate, allyl (meth) acrylate, vinyl (meth) acrylate, divinylbenzene and other epoxy acrylates, polyester acrylates, urethane acrylates It is preferably used.

In the case where the flake-shaped waterproof pressure-sensitive adhesive tape does not particularly require shear adhesive strength or the like and preferably has a high rough surface followability, the acrylic copolymer is rather not crosslinked. It is more preferable to use them.

In the acrylic pressure-sensitive adhesive layer, a tackifier resin (also called tackifier) and various additives such as a conventionally known plasticizer, softener, and inorganic filler are added to the acrylic copolymer. Agents, organic fillers, pigments, dyes, calcium carbonate, silica, talc, and the like.

The thickness of the adhesive after drying is 0.2 mm to
About 2 mm is preferable. If it is less than 0.2 mm, the ability to follow the irregularities of the opening frame member serving as the base material is poor, and the waterproof performance may not be sufficiently exhibited. On the other hand, when the thickness is larger than 2 mm, the pressure-bonding force is not sufficiently transmitted to the adhesive layer, and similarly, the ability to follow unevenness is poor, and the waterproof performance may not be exhibited.

The small-piece waterproof pressure-sensitive adhesive tape used in the present invention has the above-mentioned self-adhesive property on the transparent or translucent base tape, for example, by a casting method (including a case of subsequent crosslinking) or a transfer method. After forming a transparent or translucent pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer, laminated with a release material such as release paper or release film obtained by performing release treatment on at least one surface such as paper or plastic film, It is obtained by processing it into small pieces of an appropriate size. The release agent used for the release material is not particularly limited, and examples thereof include a conventional silicone resin-based release agent and a long-chain alkyl group pendant graft polymer-based release agent.

The method of processing the waterproof adhesive tape into small pieces is not particularly limited, and examples thereof include a punching method and a cutting method. The punching method is preferred in terms of ease of processing into small pieces and productivity. It is preferably adopted. Examples of the punching method include a Thomson method in which a flat plate is punched, a rotary method in which a tape is punched along a roll shape, and the like. The size of the piece-shaped waterproof adhesive tape is not particularly limited, and is, for example, 5 to 150 mm in width × 10 × 300 mm in length.
Degree.

[0031]

At this time, for example, as shown in FIG. 1, the release material layer 3 constituting the piece-shaped waterproof pressure-sensitive adhesive tape is shorter than the pressure-sensitive adhesive layer 2 laminated on the base tape 1. Half-cut type release material layers 31 divided into two hand directions
Alternatively, as shown in FIG. 2, an overlap-type release material layer 35 may be provided such that one end of the release material layer 35 overlaps the other end of the release material layer 36.

In order to implement the waterproofing method around the opening according to the present invention, the opening frame member (aluminum sash or the like) 5 shown in FIG. 3 is assembled at the construction site and fitted to the opening of the wall. In this case, when shipping from a factory, the release material layer 31 or 35 on one side of the half-cut type or the overlap type of the piece-shaped waterproof adhesive tape is peeled off, and only the exposed adhesive layer is shown in FIG. As shown in the figure, the main body 6 of the opening frame member is attached to (the right end of the upper outer frame 61).

Then, at the construction site, the main body 6 of the opening frame member
And separates the prepared pressure-sensitive adhesive layer from the remaining release material layer 31 or 36 and joins the exposed pressure-sensitive adhesive layer to the main body 6 of the opening frame member. 7 is attached by pressure bonding. FIG. 5 is an enlarged schematic perspective view of a portion where the upper outer frame 61 of the main body of the opening frame member and the separate body 7 are joined together in FIG. 3, but for convenience, the upper outer frame left end and the separate body are separated from each other. And the outer frame 61 is indicated by a white arrow.
3 shows the boundary between the object 7 and the separate body 7.

(Function) The small-sized waterproof pressure-sensitive adhesive tape used in the present invention is formed by laminating a transparent or translucent base tape and a transparent or translucent pressure-sensitive adhesive layer having self-adhesive properties. For the opening frame member such as wood or wooden sash, the good adhesion and the poor adhesion can be visually recognized through the tape, and the adhesive layer has self-healing property accompanying self-adhesion. According to the present invention, sealing can be reliably performed in waterproofing around the opening, and the reliability of waterproofing is significantly improved.

Incidentally, in the field of adhesives and pressure-sensitive adhesives, "self-adhesion" generally means that substances are bonded by diffusing molecules mutually. The self-adhesiveness in the present invention has, while having adhesiveness, for example, a two-layer adhesive waterproof layer at room temperature,
When placed on top of each other so as to be in contact with each other horizontally, this means that both layers are integrated and the joining surface is unknown. In addition, by stamping and partially attaching the piece-shaped waterproof adhesive tape in advance to the sash structure before shipment, the construction time on site is greatly reduced, and there is no variation in construction quality between workers This enables waterproof construction.

[0036]

The present invention will be described below in more detail with reference to examples. Example 1 20 parts by weight of isomeristicyl acrylate, 80 parts by weight of 2-ethylhexyl acrylate, 2 parts by weight of acrylic acid, 0.02 part by weight of n-dodecanethiol as acrylic copolymer constituting monomers, and as a photopolymerization initiator 0.1 part by weight of 2,2-dimethyl-2-phenylacetophenone (Irgacure 651: manufactured by Ciba-Geigy) and 0.05 part by weight of hexanediol diacrylate as a cross-linking agent are uniformly mixed, and the thickness of the mold release treatment is 38.
The thickness at the end of polymerization is 0.5 ± 0.1 mm on the release treated surface of a μm polyester film (hereinafter PET film).
Then, the release surface of the PET film subjected to the same release treatment was covered so as to be in contact with the coated surface. Using a chemical lamp, light was irradiated from above the cover PET film at an irradiation intensity of ² mW / cm ² for 10 minutes to copolymerize the above monomers to obtain an acrylic pressure-sensitive adhesive layer made of an acrylic copolymer.

After peeling off one PET film of the acrylic pressure-sensitive adhesive layer thus obtained, a 15 mm × 30 mm PET film as a release material layer and a 10 mm ×
A 30 mm PET film was laminated in an overlapped state so that the overlap margin was about 5 mm. As shown in FIGS. 3 and 4, the release material layer 35 on one side of the small piece of waterproof adhesive tape is provided.
Then, only the exposed pressure-sensitive adhesive layer was adhered to the main body 6 of the aluminum sash 5 (the right end of the upper outer frame 61) while leaving the release material layer 36. Then, separate body to the body 7
Then, the pressure-sensitive adhesive layer exposed by peeling off the release material layer 36 was pressure-bonded to the separate body 7 to join them. The joining workability of the aluminum sash was good.

Example 2 Same as Example 1 except that the film was changed to 110 μm polyethylene yarn cloth (manufactured by Hagiwara Kogyo) and the release material layer was changed to a half-cut type consisting of 31, 31 as shown in FIG. Then, a piece-shaped waterproof adhesive tape was obtained, and a waterproofing construction method was performed. The joining workability of the aluminum sash was good.

Example 3 A small piece of waterproof adhesive was prepared in the same manner as in Example 1 except that the pressure-sensitive adhesive was a solvent-type rubber-based pressure-sensitive adhesive (BPS375-1 manufactured by Toyo Ink Co., Ltd.) and the thickness after drying was 2 mm. A tape was obtained and a waterproofing method was performed. The joining workability of the aluminum sash was good.

Example 4 A small piece of waterproof pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after drying was changed to 0.2 mm, and a waterproofing method was performed. The joining workability of the aluminum sash was good.

Comparative Example 1 As an adhesive, butyl rubber 1 was used.
A flake-shaped waterproof pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that a black opaque butyl rubber-based pressure-sensitive adhesive containing 00 parts by weight and 40 parts of a plasticizer was used, and a waterproofing method was performed.

Comparative Example 2 As an adhesive, 100 parts by weight of asphalt, 50 parts of natural rubber, and tackifier 3
A small piece of waterproof adhesive tape was obtained in the same manner as in Example 1 except that a black opaque rubberized asphalt-based adhesive containing 0 part was used, and a waterproofing method was performed.

Using the tapes obtained in each of the examples and comparative examples, the practical performance was evaluated as follows, and the results are shown in Table 1. The gel fraction obtained by dipping and dissolving the acrylic copolymer obtained in each example in a solvent was about 40 to 70%, and the average value was 60%.

<Evaluation Items for Practical Performance> Evaluation of waterproofness Two aluminum plates (25 × 150 mm) polished with 280 sandpaper were attached to a transparent acrylic plate with a gap of 5 mm as shown in FIG. Is sealed with a sealing agent (not shown) on the aluminum plate in this state, and the width 25 obtained in the example and the comparative example is obtained.
mm tape was attached using a 2 kg roller. This test piece was immersed in a water tank having a water depth of 120 mm (120 Pa), and after 48 hours, it was visually checked whether or not water had entered the gap between the aluminum plates.

In Examples 1-4, after the roller was pressed, the pressed portion and the non-pressed portion were clearly visible, and the non-pressed portion was pressed again with a finger. In Comparative Examples 1 and 2, the pressure-bonded portion and the non-pressure-bonded portion were not clearly visible, and were only pressed with a roller.

Evaluation of Stain Contamination As a substitute property for the evaluation of contamination, the tapes obtained in the respective Examples and Comparative Examples were applied to gauze, pressed with a 2 kg roller, and left for 1 hour. One hour later, the tape was peeled from the gauze at a speed of 300 mm / min, and the presence or absence of an adhesive residue on the gauze was confirmed.

[0047]

[Table 1]

In Examples 1 to 3, adhesion of the adhesive due to water leakage and adhesive residue was not observed. On the other hand, in Comparative Examples 1 and 2, water leakage due to poor pressure bonding and adhesion of the adhesive due to the remaining adhesive were observed.

[0049]

The waterproofing method around the opening according to the present invention is constituted as described above, and the transparent or translucent base tape and the transparent or translucent pressure-sensitive adhesive layer having self-adhesiveness are provided. Since the laminated piece-shaped waterproof adhesive tape is used, the good adhesion and the poor adhesion can be visually recognized through the tape with respect to the opening frame member, and the adhesive layer has a self-adhesive property. With the accompanying self-healing properties, according to the present invention, sealing can be reliably performed in waterproofing around the opening, and waterproofing reliability is significantly improved, as in the case of using a conventional sealing agent. The work site is not stained with the adhesive due to careless contact with the uncured adhesive layer.

When a small piece of waterproof adhesive tape in which the release material layer is divided into two in advance is used, the time required for the on-site installation can be greatly reduced, and the waterproof operation can be performed without variation in the installation quality among workers. And When the pressure-sensitive adhesive layer is mainly composed of an acrylic copolymer of a monomer having a limited compounding ratio of an alkyl (meth) acrylate having a specified number of carbon atoms, self-healing accompanying self-adhesion is achieved. With sufficient properties, it is excellent in conformability to uneven surfaces, etc., and the small piece waterproof adhesive tape expresses particularly excellent properties as a sealing tape,
The waterproof construction reliability is further improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one form of a small piece of waterproof adhesive tape used in the present invention.

FIG. 2 is a cross-sectional view showing another form of a small piece of waterproof adhesive tape used in the present invention.

FIG. 3 is an explanatory view of a waterproofing method around an opening according to the present invention, and is a schematic front view of a state in which a main body and a separate body of an opening frame member are arranged adjacent to each other.

FIG. 4 is an explanatory view of a waterproofing method around an opening according to the present invention, in which a pressure-sensitive adhesive layer of a small piece of waterproof adhesive tape, which is obtained by exfoliating a part of a release material layer and exposing a part of an opening frame member; It is a typical perspective view of the state where it was stuck on the main part.

FIG. 5 is an enlarged schematic perspective view of a portion where a left end of an upper outer frame of the main body of the opening frame member is joined to another body in FIG. 3;

FIG. 6 is a schematic perspective view for explaining a waterproof evaluation method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base tape 2 ... Adhesive layer 3 ... Release material layer 31, 31 ... Half cut type release material layer 35, 36 ... Overlap type release material layer 5 ...・ Opening frame member 6 ・ ・ ・ Main body of opening frame member 61 ・ ・ ・ Upper outer frame of main body of opening frame member 7 ・ ・ ・ Separate body of opening frame member

Continued on front page F term (reference) 2E035 AA02 BA01 CA02 CB03 CB05 DA07 DB04 DC04 4H017 AA04 AB01 AC04 AC17 AD05 AD06 AE03 4J004 AA07 AA10 AB01 AB05 AB06 CA04 CA06 CB02 CB03 CC03 DA04 DB01 EA06 FA10 GA03 4J040 DA06 GA07 GA08 GA19 GA22 HB44 HC16 JA09 JB09 KA16 LA07 MB11 MB12 NA12 PA32 PA35

Claims (3)

[Claims] 1. The release material according to claim 1, wherein the transparent or translucent base material tape, a self-adhesive transparent or translucent pressure-sensitive adhesive layer and a release material layer are laminated in this order. The adhesive layer exposed by peeling a part of the layer is adhered to the main body of the opening frame member, and then a separate body is prepared and positioned with respect to the main body of the opening frame member, and the release material layer is A method of waterproofing around an opening, wherein the pressure-sensitive adhesive layer exposed by peeling off the remaining portion is attached to a separate body of the opening frame member. 2. The waterproofing method around an opening according to claim 1, wherein a small piece of waterproof adhesive tape in which a release material layer is divided into two in advance is used. 3. The self-adhesive pressure-sensitive adhesive layer has a carbon number of 1
Acrylic copolymer obtained by copolymerizing 5 to 60% by weight of an alkyl (meth) acrylate having an alkyl group of 1 to 18 and 40 to 95% by weight of an alkyl (meth) acrylate having an alkyl group having 4 to 10 carbon atoms. 2. An acrylic pressure-sensitive adhesive layer mainly composed of coalesced particles.
Or the waterproofing construction method around the opening described in 2.