JP2000096035A - Sheet or tape for sealing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a sheet or tape for sealing enabling the visible confirmation of the adhesion of the sheet or tape to an adherend when adhereing it to the adherend and permits a positive construction, when it is applied to the adherend. SOLUTION: The objective sheet or tape is light-transmissible and light- scatterable and has pressure-sensitive adhesiveness at least on one surface. When the adhesive face is applied to an adherend, the transparency is increased at the good adhesion area, while decreased at the poor adhesion area whereby the good adhesion part and the poor adhesion part become visibly distinguishable from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing sheet or tape capable of visually recognizing the state of close contact with an adherend. More specifically, for the sealing, the good adhesion and the poor adhesion can be distinguished by the transparency of the adherend differing through the sheet or tape depending on the state of the adherence to the adherend, and the sealing can be reliably performed. Related to sheet or tape.

[0002]

2. Description of the Related Art In order to provide openings such as windows and doors on the wall of a building, it is used for sealing in order to prevent rainwater and draft from entering through gaps between the window and door frames and the wall. Sheets or tapes are used. Conventionally, a butyl rubber-based or asphalt-based sealing sheet or tape has been widely used for such waterproofing and airtightness.

[0003] Also, in order to improve the waterproofness of the roof and the wall surface, a method of attaching a waterproof sheet such as asphalt felt or a polyolefin sheet below the roof tile or inside the outer wall is widely used. A butyl rubber-based or asphalt-based sealing tape is also used to seal the boundary between the waterproof sheet and the sash frame and the joint between the waterproof sheets.

Further, in recent years, housings have been made more airtight for the purpose of improving heating efficiency and improving comfort of living spaces and suppressing energy consumption. A butyl rubber-based or asphalt-based sealing tape is also used.

[0005] As described above, butyl rubber-based or asphalt-based sealing tapes have been widely used in the construction field as the most common sealing materials because of their good adhesiveness and waterproofness and low cost. However,
Due to unevenness of the construction site or uneven pressurization at the time of application by the construction worker in the waterproofing construction, floating occurs between the sealing tape and the adherend, causing water leakage in the attic or wall body The problem has occurred. Also,
In the airtight measurement, the performance as designed was not obtained in some cases.

One of the causes of the poor waterproofing and airtightness described above is that the conventional butyl rubber-based or asphalt-based sealing material cannot check the reliability of construction at the time of construction. That is, since the butyl rubber-based or asphalt-based sealing tape is colored black, it was not possible to confirm the close contact with the adherend in appearance.

Japanese Patent Application Laid-Open No. 2-92984 discloses that a vinyl monomer containing an alkyl (meth) acrylate as a main component and a photopolymerization initiator added thereto is irradiated with ultraviolet rays to polymerize the vinyl monomer. A sealing material is disclosed. This is an elastic rubber,
The purpose is to provide a sealing material with good adherence to the uneven surface of the adherend and excellent workability, heat resistance, and weather resistance. It was not done.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a sealing sheet or tape which can be reliably applied by sticking to an adherend and visually confirming the state of close contact with the adherend. The purpose is to do.

[0009]

The sealing sheet or tape of the present invention is a sheet or tape which is light-transmitting and light-scattering and has at least one surface having an adhesive property, wherein the adhesive surface is adhered to an adherend. When combined, the portion having good adhesion to the adherend improves the transparency of the adherend through the sheet or tape, and the portion having poor adhesion to the adherend deteriorates the transparency of the adherend. Thereby, the good adhesion portion and the poor adhesion portion can be distinguished from each other.

The sealing sheet or tape of the present invention according to claim 2 is the sealing sheet or tape according to claim 1, wherein the total light transmittance is 20% or more.
In addition, the haze value is in the range of 30 to 90%.

Further, the sealing sheet or tape according to claim 3 is the sealing sheet or tape according to claim 1 or 2, wherein the sealing sheet or tape has 1 to 1 carbon atoms.
An acrylic polymer mainly composed of a (meth) acrylate having 14 alkyl groups, containing a filler or closed cells.

Further, the sealing sheet or tape according to claim 4 is the sealing sheet or tape according to claim 3, wherein the acrylic polymer has an alkyl group having 1 to 14 carbon atoms. It is a copolymer of 95 to 50% by weight of a (meth) acrylic acid ester and 5 to 50% by weight of an olefin polymer having a polymerizable unsaturated double bond at a terminal.

The light transmittance of the sealing sheet or tape of the present invention is preferably 20% or more, more preferably 30% or more, and the haze value is preferably 30% to 90%. More preferably 50 to 8
0%. When the total light transmittance is less than 20% or the haze value is higher than 90%, the reflected light from the surface of the adherend in the portion in close contact with the adherend and the reflection from the sheet or tape in the poorly adhered portion. The contrast with light is reduced, and the visual discrimination is reduced.

Actually, when the haze value is higher than 90%, the total light transmittance is also low. Therefore, usually, the haze value is higher than 90% and the total light transmittance is 20% or more. It does not become.

If the haze value is less than 30%, the scattering of the reflected light at the interface between the sheet or tape and the air at the poor adhesion portion becomes insufficient, the whiteness is reduced, and the contrast between the adhesion portion and the poor adhesion portion is small. And the visual discrimination is reduced. Contrast between the adhesion portion and adhesion failure portion varies by color and reflectance of the adherend, in the XYZ color system, W = Y + 800 (x n -x) +1700 (y n -y) ( where, x _n, y _n the chromaticity coordinates of the standard light, Y, x, y is the difference in the adhesion portion and adhesion failure portion of the whiteness W being defined by the color coordinates) of the measurement object is 5.0 or more, preferably 7.
If it is 0 or more, it is clearly recognized.

The sealing sheet or tape of the present invention uses a light-transmitting, light-scattering and flexible polymer, and has at least one surface having tackiness. In order to obtain light scattering properties, a filler or a closed cell that disperses a sufficient refractive index difference between the base material and the base material to obtain light scattering properties is dispersed in a base material having transparency. It should be done. Further, a material such as polyethylene or polypropylene having a light scattering property by forming a crystal part and a non-crystal part may be used, and a light scattering property by embossing is applied to one surface of a sheet or a tape. Is also good.

As the above-mentioned filler, conventionally known various inorganic fillers and organic fillers can be used. Examples of the inorganic filler include calcium carbonate, silica, talc and the like, and, for example, a glass balloon (manufactured by PQ Corporation, “520F”).
PS ”, average particle diameter 35 μm; 10 to 200 μm such as“ Celstar Z27 ”manufactured by Asahi Glass Co., Ltd., average particle diameter 65 μm)
hollow microspheres having an average particle size of m. Examples of the organic filler include an olefin-based filler such as ultrahigh molecular weight polyethylene powder (trade name “Miperon XM220”, manufactured by Mitsui Chemicals, Inc., average particle size: 20 μm).

As closed cells, fine closed cells which do not affect waterproofness can be formed and dispersed by, for example, performing polymerization in a state where a gas is mixed and stirred with the monomer syrup before polymerization. There is no problem even when the closed cells are used in combination with the filler.

The content of the filler or closed cells varies in the range where an appropriate haze value can be obtained depending on the size and shape of the particles and cells, the refractive index, the thickness of the sheet or tape, and the like. It is necessary to appropriately adjust it in consideration of greatly affecting the adhesiveness.

In a portion not in close contact with the adherend, an air layer exists between the sheet or tape and the adherend. In this state, the refractive index of the sheet or tape itself,
Since the difference between the refractive index of the interface between the sheet or tape and the air layer is large, light incident from outside is reflected at this interface. Here, since the sheet or tape has the above-mentioned haze value, the reflected light becomes scattered light, and the sheet or tape in this portion exhibits white.

On the other hand, since the air layer is eliminated in a portion in close contact with the adherend, light incident from the outside is reflected on the surface of the adherend. Here, the reflectivity on the surface of the adherend is lower than when there is reflection at the interface between the sheet or tape and the air layer when there is an air layer. Decrease.

As a result, a contrast can be visually confirmed between the contact portion and the poor contact portion. If the adherend is colored, it is more clearly identified. This is because the reflection at the interface between the sheet or tape and the air layer in the poorly adhered portion occurs in the entire wavelength range, so that the adhered portion is white, whereas the reflected light on the surface of the adherend has a wavelength dependence, so It looks colored in the color of the kimono. This is because the contrast between the coloring of the contact portion and the white color of the poor contact portion is enhanced.

As described above, since the state of adhesion of the sealing sheet or tape to the adherend can be visually identified after construction, the gap between the adherend and the adherend due to irregularities in the construction site or uneven pressure applied by the operator. Even if there is a floating, it can be easily found. Then, by crimping the portion, a continuous contact state is obtained, and reliable construction such as prevention of water leakage and airtightness can be performed.

As a material of the sealing sheet or tape of the present invention, an acrylic polymer mainly composed of a (meth) acrylic acid ester having an alkyl group having 1 to 14 carbon atoms is used. The filler or the one in which closed cells are dispersed for imparting the property are used in addition to the discriminating property of the adhered portion and the poorly adhered portion with the adherend, the adhesiveness for sticking to the adherend, and the unevenness of the adherend. It is suitable because it can satisfy essential requirements such as flexibility that can follow, water resistance required for waterproofing, durability that can withstand long-term use, and weather resistance.

The (meth) acrylate having an alkyl group having 1 to 14 carbon atoms includes methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, (Meth) acrylic acid isopropyl ester, (meth) acrylic acid n-butyl ester, (meth) acrylic acid sec-
Butyl ester, t-butyl (meth) acrylate, cyclohexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, ( Examples thereof include isononyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate, and isomyristyl (meth) acrylate. These alkyl (meth) acrylates may be used alone or in combination of two or more.

The acrylic polymer is converted to a (meth) acrylic acid ester 95 having an alkyl group having 1 to 14 carbon atoms.
Adhesion to adherends with a wide range of surface energies, from metals to polyolefins, by using a copolymer of 50 to 50% by weight and 5 to 50% by weight of an olefin polymer having a polymerizable unsaturated double bond at a terminal. The required adhesiveness can be obtained.

As the olefin polymer having a polymerizable unsaturated double bond at the terminal, any polymer having a polymer structure comprising a double bond copolymerizable with another polymerizable monomer at the terminal and an olefin main skeleton can be used. Good. Examples of the olefin main skeleton include an ethylene-butylene random copolymer and an ethylene-propylene copolymer.

Examples of compounds having an ethylene-butylene random copolymer having an olefin main skeleton include, for example, KLATON LIQUID Polymer HPVM manufactured by Shell Chemical Company.
-1253 ".

The copolymerization ratio of the olefin polymer having a polymerizable unsaturated double bond at the terminal in the acrylic copolymer is 5 to 50% by weight based on 95 to 50% by weight of (meth) acrylate. Preferably, more preferably 1
0 to 35% by weight. If the copolymerization ratio is less than 5% by weight, the effect of improving the adhesion to the low-polarity surface is small, and 50% by weight.
If it exceeds 3, gelation of the copolymerized monomer solution will be caused, and the practicality will be reduced.

The olefin polymer preferably has a weight average molecular weight of 2,000 to 8,000, more preferably about 3,000 to 6,000, in consideration of the flexibility of the resulting copolymer and the adhesion to the adherend. When the weight average molecular weight is less than 2,000, the effect of improving the adhesion to the low polarity surface is small, and when the weight average molecular weight exceeds 8,000, the flexibility of the obtained copolymer decreases, and the ability to follow the adherend surface is reduced. Gets worse.

By incorporating a tackifier resin in addition to the olefin polymer, the adhesion to a low-polarity surface is further improved. As the tackifying resin, a rosin resin, a modified rosin resin, a terpene resin, a terpene phenol resin, a C5 and C9 petroleum resin, a cumarone resin, and a hydrogenated product thereof are used alone or in combination.

However, when the tackifying resin is mixed with the photopolymerizable composition to cause a polymerization reaction, care must be taken since the polymerization rate may be reduced. In this case, it is necessary to appropriately adjust the amounts of the chain transfer agent and the crosslinking monomer. Examples of tackifier resins having low polymerization inhibiting properties include hydrogenated terpene resins, hydrogenated rosin resins, disproportionated rosin resins, and alicyclic saturated hydrocarbon resins.

The amount of the tackifying resin is 5 to 50 parts by weight based on 100 parts by weight of the acrylic copolymer.
Preferably it is 10 to 35 parts by weight. If the amount of the tackifying resin is less than 5 parts by weight, the effect of improving the adhesion to the low-polarity surface is small, and if it is more than 50 parts by weight, the flexibility decreases due to an increase in the glass transition temperature of the sealing material. Followability and adhesion to uneven surfaces are reduced.

In order to adjust the glass transition temperature, adhesiveness, etc. of the sealing sheet or tape of the present invention, styrene, α-methylstyrene, o-methylstyrene, p-
Vinyl alcohol esters of alkyl carboxylic acids such as methyl styrene and vinyl acetate; vinyl carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, phthalic acid and itaconic acid; vinyl carboxylic anhydrides such as carboxylic anhydride; 2-hydroxyethyl (Meth) acrylate, 2-
Hydroxy group-containing vinyl monomers such as hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, caprolactone-modified (meth) acrylate, polyoxyethylene (meth) acrylate, polyoxypropylene (meth) acrylate; (meth) acrylonitrile, N-vinylpyrrolidone, N -Copolymerizable vinyl monomers such as vinyl caprolactam, acryloyl morpholine, (meth) acrylamide, nitrogen-containing vinyl monomers such as dimethylaminoethyl acrylate, diethylaminoethyl acrylate and dimethylaminopropyl acrylamide may be copolymerized.

The vinyl monomer is rarely not blended in practical use, but if it is too large, the flexibility of the sealing material is reduced, and the followability and adhesion to irregularities of the adherend are reduced. It is preferable that the amount added to be 20% by weight or less.

The acrylic polymer may be cross-linked by a cross-linking agent, if necessary, to improve heat resistance and creep characteristics. In a polymerization method such as solution polymerization in which an acrylic polymer is polymerized in a solvent or emulsion polymerization in water, a polymerizable monomer having a reactive polar group is contained, and a crosslinking agent capable of reacting with the polar group is used. It is possible to add crosslinking by adding it in advance.

Examples of the crosslinking agent include tolylene diisocyanate, naphthylene-1,5-diisocyanate,
Isocyanate-based crosslinking agents such as diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylene diisocyanate, trimethylolpropane-modified tolylene diisocyanate; ethylene glycol dichridyl ether, propylene glycol diglycidyl ether, 1,6-hexadiol diglycidyl ether Epoxy crosslinking agent; N, N
And aziridine-based cross-linking agents such as -hexamethylene-1,6-bis (1-aziridinecarboxamide). These may be used alone or in combination of two or more.

When an acrylic polymer is polymerized by photopolymerization, crosslinking can be performed simultaneously with polymerization of the acrylic polymer by adding a polyfunctional (meth) acrylate compound as a crosslinking agent.

The polyfunctional (meth) acrylate compound includes 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate,
(Poly) ethylene glycol di (meth) acrylate,
(Poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate,
Pentaerythritol di (meth) acrylate, glycerin methacrylate acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, allyl (meth) acrylate, vinyl (meth) acrylate, divinylbenzene, epoxy (meth) Acrylates, polyester (meth) acrylates, urethane (meth) acrylates and the like can be mentioned. These may be used alone or in combination of two or more.

The smaller the amount of the crosslinking agent, the lower the cohesive force.
Heat resistance and creep properties are inferior. If too large, flexibility is impaired, and followability and adhesion to irregularities on the adherend are reduced. Therefore, the addition amount to the acrylic polymer is 0.01 to 1% by weight.
And more preferably 0.02 to 0.8% by weight.

The polymer constituting the sealing sheet or tape of the present invention may be a solution polymerization system, a bulk polymerization system,
Polymerization is performed by a known method such as an emulsion polymerization method and a pearl polymerization method. When the solution polymerization method is used, polymerization is carried out using a thermal polymerization initiator such as azobisisobutyronitrile and benzoyl peroxide in the presence of a solvent such as ethyl acetate or toluene. The obtained polymer solution is cast on a substrate, and the solvent is dried to obtain a sheet-like sealing material. This may be slit into an appropriate width to form a tape.

In the case of the bulk polymerization method, a photopolymerization method using ultraviolet light is most preferable because a uniform polymer can be easily obtained. In the polymerization by ultraviolet rays, the polymerizable composition is cast on a substrate and irradiated with ultraviolet rays, whereby a sheet-like sealing material is obtained simultaneously with the polymerization, so that the productivity is excellent. Further, there is an advantage that a sheet having a large thickness can be easily produced, and a solvent is not used, so that deterioration of the environment due to evaporation of the solvent can be avoided.

In the case of photopolymerization, a photopolymerization initiator is contained in the polymerizable composition. As the photopolymerization initiator, for example, 4-
(2-Hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone (trade name “Darocur 2959” manufactured by Merck); α-hydroxy-α, α′-dimethylacetophenone (trade name “Darocur” manufactured by Merck Ltd.) 1173 "), acetophenones such as methoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone (trade name" Irgacure 184 ", manufactured by Ciba Geigy); ketals such as benzyldimethyl ketal; other halogenated ketones, acylphos Finoxide, acylphosphonate and the like can be mentioned.

These photopolymerization initiators are used in an amount of 0.001 to 5 based on the total amount of (meth) acrylic acid alkyl ester, olefin polymer modified with radically polymerizable unsaturated double bond, vinyl monomer for adjustment and the like. It is preferably added in a proportion of% by weight. If it is less than 0.001% by weight, the reaction initiation density becomes insufficient and the monomer tends to remain. In such a state, the heat resistance and adhesiveness of the sealing material are reduced, and a monomer odor remains. On the other hand, when the content is more than 5% by weight, the reaction rate is increased, but the molecular weight of the polymer is reduced, and the performance and performance of the sealing material are caused to vary or decrease.

The light source for light irradiation in photopolymerization is 400 n
Those having an emission distribution at a light wavelength of m or less are used.
Examples thereof include low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, chemical lamps, black light lamps, microwave-excited mercury lamps, and metal halide lamps.
Among them, chemical lamps efficiently emit light in the active wavelength region of the photopolymerization initiator, and light is transmitted to the inside due to little light absorption by the composition other than the photopolymerization initiator, thereby producing a product with a thick film. Especially preferred in such cases.

The intensity of light irradiation on the photopolymerizable composition by the light source is a factor that affects the degree of polymerization of the obtained polymer, and is appropriately controlled for each performance of the target product. When a cleavage type photopolymerization initiator having a normal acetophenone group is blended, the irradiation intensity is 0.1 to 0.1 in a wavelength region effective for photodecomposition of the photopolymerization initiator (it usually varies from 365 to 420 nm, depending on the initiator). 100 mW / cm ² is preferred.

The sealing sheet or tape of the present invention is obtained by forming the polymer obtained by the above polymerization method into a sheet, and laminating the sheet on one or both sides of a transparent substrate to form a single-sided or double-sided adhesive tape. Can be used. When a polymerizable composition is used, for example, PE
A polymerizable composition is cast on one surface of a transparent substrate such as a T film and polymerized by irradiation with light in that state to form a single-sided adhesive sheet, or a transparent substrate is produced using a normal double-sided adhesive tape manufacturing method. It can be laminated on both sides of the material and used as a double-sided adhesive sheet for sealing. Further, if the single-sided or double-sided pressure-sensitive adhesive sheet is slit into an appropriate width to form a roll-shaped wound body, it can be used as a single-sided or double-sided pressure-sensitive adhesive tape.

[0048]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the following examples. (Example 1) 70 parts by weight of 2-ethylhexyl acrylate 30 parts by weight of isomyristyl acrylate An ethylene-butylene random copolymer having a polymerizable unsaturated double bond at a terminal (“HPVM-1253” manufactured by Shell Co., Ltd.) 15 parts by weight Acrylic acid 7 parts by weight Alicyclic saturated hydrocarbon tackifying resin (trade name "Alcon P-100" manufactured by Arakawa Chemical Co., Ltd.) 25 parts by weight Hexanediol diacrylate 0.05 part by weight Thickener ( 2 parts by weight Light scattering filler (trade name "XOL-200" manufactured by PQ Corporation) 5 parts by weight 2,2-dimethyl-2-phenylacetophenone (Ciba Geigy) 0.1 g by weight in a separable flask until the above compound is uniformly dispersed. , And dissolved oxygen was removed by bubbling nitrogen gas to prepare a polymerizable syrup.

A spacer having a thickness of 2 mm was placed on a transparent polyethylene terephthalate (PET) film having a thickness of 38 μm, and the above polymerizable syrup was cast on the PET film. Then, another mold releasing PET film was released. The treated surface was covered so as to contact the polymerizable syrup. The cover P
Ultraviolet rays are irradiated for 10 minutes by a chemical lamp arranged at a height adjusted so that the irradiation intensity becomes ² mw / cm ² on the ET film, and polymerization is carried out. Obtained.

FIG. 1 is a plan view showing a state in which the sealing sheet 1 is attached across the boundary 5 between the aluminum sash frame 3 and the asphalt felt waterproof sheet 4. FIG. 2 shows FIG.
2 is a cross-sectional view taken along the line II-II, wherein 11 is a transparent PET film, and 12 is a polymer. In FIG. 1, the contact portion 1 on the aluminum sash frame 3 and the asphalt felt waterproof sheet 4
3, and a clear contrast was visually recognized in the poor adhesion portion 14 at the boundary 5.

(Example 2) 80 parts by weight of n-butyl acrylate 20 parts by weight of isononyl acrylate An ethylene-butylene random copolymer having a polymerizable unsaturated double bond at a terminal (“HPVM-” manufactured by Shell Co., Ltd.) 1253 ") 15 parts by weight Acrylic acid 7 parts by weight Alicyclic saturated hydrocarbon tackifying resin (trade name" Alcon P-100 "manufactured by Arakawa Chemical Co., Ltd.) 25 parts by weight n-dodecanethiol 0.02 parts by weight Light scattering 7 parts by weight of a functional filler (trade name “XOL-200” manufactured by PQ Corporation) 0.1 part by weight of 2,2-dimethyl-2-phenylacetophenone (trade name “Irgacure 651” manufactured by Ciba Geigy) After stirring and mixing in a separable flask until the substance was uniformly dispersed, nitrogen gas was bubbled to remove dissolved oxygen.

The solution was irradiated with a black light lamp while stirring, and when the temperature of the solution rose by 5 ° C., the light irradiation was stopped. The conversion of the resulting polymer was 3.
7%, viscosity was 2200 cps. Furthermore, 0.05 parts by weight of hexanediol diacrylate was added to add 10 parts by weight.
After stirring for a minute, a syrup was obtained.

A sealing sheet was obtained in the same manner as in Example 1 except that the thickness of the spacer was 1.5 mm.

FIG. 3 is a plan view showing a state in which the sealing sheet 1 is attached across the fixing nails 6 of the aluminum sash frame 3. FIG. 4 is a sectional view taken along line IV-IV in FIG. In FIG. 3, a clear contrast was visually recognized in the contact portion 13 with the aluminum sash frame 3 and the poor contact portion 14 of the fixing nail 6.

Comparative Example 1 A sealing sheet was prepared in the same manner as in Example 1 except that the thickness of the sealing sheet was 3.2 mm. FIG. 5 is a plan view showing a state in which the sealing sheet 2 is attached across the boundary between the aluminum sash frame 3 and the asphalt felt waterproof sheet 4. As can be seen from FIG. 5, the contrast between the contact portion 21 on the aluminum sash frame 3 and the asphalt felt waterproof sheet 4 and the poor contact portion 22 at the boundary was unclear.

Comparative Example 2 A sealing sheet was prepared in the same manner as in Example 2 except that the amount of the light-scattering filler (trade name “XOL-200” manufactured by PQ Corporation) was 1 part by weight. Produced. FIG. 6 is a plan view showing a state in which the sealing sheet 20 is attached to the boundary between the aluminum sash frame 3 and the asphalt felt waterproof sheet 4. As can be seen from FIG. 6, the contrast between the contact portion 21 on the aluminum sash frame 3 and the asphalt felt waterproof sheet 4 and the poor contact portion 22 at the boundary was unclear.

The total light transmittance and haze value of the sealing sheets obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were measured with a haze meter (manufactured by Tokyo Denshoku Co., Ltd., model number “TC-HIIIDPK”). Further, the whiteness of the adhered portion and the poorly adhered portion was measured by a color analyzer. Table 1 shows the above results.

[0058]

[Table 1]

[0059]

As described above, the sealing sheet or tape of the present invention has the above-described structure. Therefore, the transparency of the adherend varies depending on the state of adhesion of the sealing sheet or tape to the adherend. Thus, a portion having good adhesion and a portion having poor adhesion can be distinguished from each other, and even if there is a floating between the portion to be adhered due to unevenness of a construction portion and uneven pressure of an operator, the portion can be easily found. Then, by crimping the portion, a continuous contact state is obtained, and reliable construction such as prevention of water leakage and airtightness can be performed.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a sealing sheet of the present invention is attached to a boundary between an aluminum sash frame and an asphalt felt waterproof sheet.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a plan view showing a state in which the sealing sheet of the present invention is stuck on a nailed portion of an aluminum sash frame.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a plan view showing a state in which a sealing sheet of a comparative example is attached to a boundary between an aluminum sash frame and an asphalt felt waterproof sheet.

FIG. 6 is a plan view showing a state in which a sealing sheet of a comparative example is attached to a boundary between an aluminum sash frame and an asphalt felt waterproof sheet.

[Explanation of symbols]

 1, 2, 20: Sealing sheet 3: Aluminum sash frame 4: Asphalt felt waterproof sheet 5: Boundary part 6: Fixed nail 11: Transparent PET film 12: Polymer 13, 21: Adhesive part 14, 22: Poor adhesion part

Claims (4)

[Claims] 1. A sheet or tape which is light-transmitting and light-scattering and has at least one surface having tackiness,
When the adhesive surface is attached to the adherend, the sheet or tape is used to improve the transparency of the adherend at a portion where the adherence to the adherend is good, and the adhesive is applied at a portion where adhesion is poor with the adherend. A sealing sheet or tape characterized in that a good adhesion portion and a poor adhesion portion can be distinguished by deteriorating the see-through property of the body. 2. The sealing sheet or tape according to claim 1, wherein the total light transmittance is 20% or more and the haze value is in the range of 30 to 90%. 3. An acrylic polymer containing a (meth) acrylic acid ester having an alkyl group having 1 to 14 carbon atoms as a main component and containing a filler or closed cells. The sealing sheet or tape according to claim 1 or 2. 4. An acrylic polymer having 1 to 14 carbon atoms.
(Meth) acrylate ester having two alkyl groups 9
The sealing sheet or tape according to claim 3, wherein the copolymer is a copolymer of 5 to 50% by weight and 5 to 50% by weight of an olefin polymer having a polymerizable unsaturated double bond at a terminal.