JP2000053929A - Adhesive seal tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an adhesive seal tape hardly causing clearance and wrinkle even if the adhesive seal tape is stuck so as to overlap and to seal a joint part having a clearance, capable of precisely sealing the clearance of the joint. SOLUTION: This adhesive seal tape is obtained by laminating an acrylic adhesive layer having <=1 g/mm2 tensile modulus and >=300% elongation and 0.05-5 mm thickness provided by JIS Z 0237, on one surface of a substrate sheet having 3-500 gf Elmendorf tear strength. For example, a polyethylene film or the like is cited as the substrate sheet, and the thickness of the sheet is preferably 10-500 μm. The acrylic adhesive is preferably the one consisting essentially of an acrylic copolymer obtained by copolymerizing 5-60 wt.% 11-18C alkyl (meth)acrylate, because the adhesive becomes especially excellent in extension, followingness to an uneven face, or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a floor or wall,
The present invention relates to an adhesive seal tape used for the purpose of waterproofing, moistureproofing, and airtightness of a gap with a pillar penetrating therethrough.

[0002]

2. Description of the Related Art Conventionally, a pressure-sensitive adhesive tape for sealing, in which a pressure-sensitive adhesive layer is laminated on a flexible base material, has been used for waterproofing, moisture-proofing, airtightness of buildings such as houses and buildings. For applications such as waterproofing and moistureproofing, for example, a self-adhesive rubberized asphalt composition is laminated on a base fabric laminated on one side with a thermoplastic resin as described in JP-A-61-28571. Adhesive tape was used. For airtight use, as described in JP-A-9-32128, a laminate of a polyolefin-based film and a butyl rubber-based adhesive, a rubberized asphalt-based adhesive, or an acrylic-based adhesive is used. I was

The adhesive tapes described in any of the above publications are
It could be used for waterproof, moisture-proof, and air-tightness, such as gaps between flat surfaces, corners and corners, steps, and uneven surfaces. However, in recent years, with the demand for high reliability and high airtightness against rain leaks from houses, parts requiring a new seal have increased. For example, a seal between a column or a pipe penetrating a floor or a wall and a gap between the floor and the wall has been required.

For example, as shown in a perspective view in FIG.
In the case where the gap formed between the column 3 and the column 3 penetrating therethrough is sealed with the adhesive tape 10, the corners of the column 3 and the floor cannot be continuously sealed, and another adhesive tape 11 is used. Pasting was done by overlapping. As a result, there has been a problem that a gap is formed between the upper and lower adhesive tapes 10 and 11, an overlapping portion is peeled off, and the adhesive tape is wrinkled when it is forcibly and continuously applied.

[0005] In some cases, an adhesive tape in which an adhesive layer is laminated on a base sheet having flexibility and elasticity is also used. It was difficult. That is, the airtightness becomes insufficient because a minute gap is formed in the overlapping portion of the adhesive tape.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is possible to prevent gaps and wrinkles from being generated even when the laminate is pasted up to seal a joint of a building having a gap. It is an object of the present invention to provide an adhesive seal tape capable of reliably sealing a joining gap.

[0007]

The adhesive sealing tape according to the first aspect of the present invention has an Elmendorf tear strength of 3 to 50.
On one surface of a base sheet of 0 gf, the tensile elastic modulus specified in JIS Z 0237 is 1 g / mm ² or less;
Elongation at break of 300% or more and thickness of 0.05 to 5 m
m of the acrylic pressure-sensitive adhesive layer.

According to a second aspect of the present invention, there is provided an adhesive seal tape according to the first aspect, wherein the acrylic adhesive has an alkyl group having 11 to 18 carbon atoms. It is characterized by containing an acrylic copolymer obtained by copolymerizing acrylate in an amount of 5 to 60% by weight as a main component.

In order to solve the above-mentioned problems, the present invention makes it possible to seal without generating gaps and wrinkles by combining a base sheet having hand-cutting properties and an easily stretchable adhesive. is there.

The base sheet having hand-cutting properties used in the present invention includes:
A cut can be easily made by hand from one or both of the longitudinal direction and the width direction of the adhesive tape, and refers to a film or sheet that can be separated by hand in a straight line, for example, polyester, polyethylene, nylon, Woven fabric in which synthetic fibers such as vinylon, cotton, and pulp spun yarn are woven vertically and horizontally, and one side of which is laminated with polyethylene, polypropylene, etc., uniaxially stretched such as polyethylene, polypropylene, polystyrene, polyvinyl chloride Films and the like.

[0011] The Elmendorf tear strength of the base material sheet may be cut to an unnecessary portion when the base material sheet is low, and the hand-cutting property and the sticking workability are poor when the base sheet is high. 10-20
0 gf.

When the thickness of the base sheet is thin, the tear strength is low, so that unnecessary portions may be cut off. When the base sheet is thick, it may be difficult to cut by hand or the workability of application may be poor. A range of 500 μm is preferred.

Acrylic pressure-sensitive adhesive The acrylic pressure-sensitive adhesive used in the present invention is an acrylic pressure-sensitive adhesive obtained by copolymerizing an alkyl (meth) acrylate having an alkyl group of 4 to 10 carbon atoms with another modified vinyl monomer. It is mainly composed of a polymer. In addition, the acrylic copolymer may be appropriately copolymerized with an olefin polymer having a polymerizable unsaturated double bond at a terminal in order to impart adhesiveness to an olefin resin such as polyethylene. .

The alkyl (meth) acrylate has 4 to 10 carbon atoms in the alkyl group.
-Butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-octyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, and the like. These can be used alone or in combination.

The above-mentioned modified vinyl monomer is copolymerized for the purpose of improving cohesive strength. For example, a vinyl monomer having a carboxyl group such as acrylic acid, maleic acid, itaconic acid or the like or an anhydride thereof: acrylonitrile,
Nitrogen-containing vinyl monomers such as N-vinylpyrrolidone, N-vinylcaprolactam, acryloylmorpholine, (meth) acrylamide, dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylamide: 2-hydroxyethyl (meth) acrylate, 2 -Hydroxy group-containing vinyl monomers such as hydroxybutyl (meth) acrylate, caprolactone-modified (meth) acrylate, polyoxyethylene (meth) acrylate, and polyoxypropylene (meth) acrylate.

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 double bond copolymerizable with another vinyl monomer and an olefin skeleton at the terminal. Without being limited, examples of the olefin skeleton include an ethylene-propylene copolymer and an ethylene-butylene copolymer.

The acrylic copolymer is obtained by copolymerizing an alkyl (meth) acrylate having an alkyl group having 11 to 18 carbon atoms in an amount of 5 to 60% by weight, so that the pressure-sensitive adhesive can easily be stretched and the uneven surface can be formed. This is particularly preferable because the following property is particularly excellent. Examples of the alkyl (meth) acrylate having 11 to 18 carbon atoms in the alkyl group include lauryl (meth) acrylate, myristyl (meth) acrylate, isomyristyl (meth) acrylate, palmityl (meth) acrylate, and stearyl (meth) acrylate. And the like.

Acrylic copolymers can be obtained by polymerization using bulk polymerization, solution polymerization, emulsion polymerization, pearl polymerization, or the like. In bulk polymerization, photopolymerization using ultraviolet light is necessary because a uniform polymer can be obtained. Preferably, in this case, a photopolymerization initiator is contained. Crosslinking of these copolymers may be performed by any known method, and examples thereof include isocyanate crosslinking, epoxy crosslinking, aziridine crosslinking, and crosslinking with a polyfunctional vinyl monomer. Further, the acrylic copolymer may be cross-linked by a crosslinking agent, and the acrylic pressure-sensitive adhesive may contain a tackifier resin and various additives.

The UV-curable acrylic pressure-sensitive adhesive will be described below. The ultraviolet polymerization method is a method of blending a photopolymerization initiator, a polyfunctional vinyl monomer, and the like with an acrylic monomer composition, applying the mixture on a release-treated film, and using a transparent film to suppress polymerization inhibition by oxygen. Polymerization is performed by covering or irradiating with ultraviolet rays in an atmosphere of an inert gas such as nitrogen gas.

As the photopolymerization initiator, for example, 4- (2
-Hydroxyethoxy) phenyl (2-hydroxy-2)
-Propyl) ketone (manufactured by Merck, trade name “Darocur 2959”), α-hydroxy-α, α′-dimethyl-acetophenone (manufactured by Merck, trade name “Darocur 1173”), methoxyacetophenone, 2,2-dimethoxy Acetophenones such as -2-phenylacetophenone (Circa Geigy, trade name "Irgacure 651") and 2-hydroxy-2-cyclohexyl acetophenone (Ciba Geigy, trade name "Irgacure 184"); other halogenated ketones, acylphos Finoxide, acylphosphonate and the like.

When the acrylic copolymer is obtained by bulk polymerization by irradiation with ultraviolet rays, a polyfunctional vinyl such that the acrylic monomer composition has two or more copolymerizable unsaturated double bonds in the molecule. Crosslinking can be achieved by adding a monomer. For example, hexanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (Meth) acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, allyl (meth) acrylate, vinyl (meth) acrylate, divinylbenzene and other epoxy acrylates, urethane Relate the like are suitably used.

The tackifying resin may be a known rosin resin, a modified rosin resin, a terpene resin, a terpene phenol resin, a C5 or C9 petroleum resin, a cumarone resin, or a hydrogenated product thereof, if necessary. , Used alone or in combination.

If necessary, known additives such as plasticizers, softeners, inorganic fillers, organic fillers, pigments, dyes, calcium carbonate, silica, and talc may be added.

When the acrylic pressure-sensitive adhesive layer comprising the acrylic copolymer obtained above has a tensile modulus of more than 1 g / mm ² , it becomes difficult to stretch, and when stretched and attached, a contraction force acts to form a gap. I do. If the elongation at break is less than 300%, the material may be cut before obtaining the required elongation.

The method of laminating the acrylic pressure-sensitive adhesive on the surface of the substrate sheet may be such that a solution of a polymerized solvent-type or emulsion-type acrylic pressure-sensitive adhesive is directly applied to the substrate sheet and dried. The processed process paper may be coated on the release treated surface of the process paper, dried, and laminated by transfer. Further, after applying the acrylic monomer composition to the base sheet, photopolymerization may be performed by irradiation with ultraviolet rays. Further, if the surface opposite to the surface on which the adhesive is applied is release-treated with silicone or the like, it can be wound up in a roll shape as it is. If the release treatment is not performed, release paper can be stacked on the pressure-sensitive adhesive surface, and can be stacked as a single sheet or wound in a roll.

(Function) The adhesive seal tape of the present invention
When the base material sheet has Elmendorf tear strength of 3 to 500 gf
It has hand-cutting properties, and the base sheet is indispensable.
Only necessary parts can be easily torn by hand.
The acrylic pressure-sensitive adhesive layer laminated on one side of the base sheet is J
The tensile modulus of elasticity specified in IS Z 0237 is 1 g
/ Mm ^TwoOr less, and the elongation at break is 300% or more.
Since it has a thickness of 0.05 to 5 mm
The adhesive is easy to stretch and hard to shrink.

Therefore, as shown in FIG. 1, even if only the base sheet 1 is cut, the pressure-sensitive adhesive 2 is stretched without cutting, and can seal the joint portion of the adherend without any gaps, thereby forming wrinkles. I can't do it.

[0028]

Embodiments of the present invention will be described below. In addition, the tensile modulus and the breaking strength are based on JIS Z 023.
7 according to JIS K7
127. (Example 1) 80 parts by weight of 2-ethylhexyl acrylate, 20 parts by weight of isomiristyl acrylate, 2 parts by weight of acrylic acid, 0.02 part by weight of n-dodecanethiol,
An acrylic monomer composition was prepared by uniformly mixing 0.1 part by weight of 2,2-dimethyl-2-phenylacetophenone (trade name: Irgacure 651 manufactured by Ciba Geigy) and 0.05 part by weight of hexanediol diacrylate. On the release surface of the release-treated polyester film having a thickness of 38 μm, coating was performed so that the thickness at the end of the polymerization was 1 ± 0.1 mm, and the release surface of the same release-treated polyester film was applied as described above. The polyester film was then irradiated with ultraviolet light at an irradiation intensity of ² mW / mm ² for 10 minutes from above the polyester film using a chemical lamp, and the tensile elastic modulus of the acrylic pressure-sensitive adhesive obtained above was 0.6 g / mm ^2, was 1000% elongation at break. after peeling off the polyester film in contact with the acrylic adhesive, hand cutting property Polyethylene and polyethylene cross-laminated products as wood sheet (Hagiwara Kogyo Co., Ltd.,
(PE Lamicloth, trade name, thickness 110 μm) were laminated to obtain an adhesive seal tape.

(Example 2) An adhesive seal tape was obtained in the same manner as in Example 1 except that the hand-cut base sheet was changed to a raw polyester cloth (manufactured by Teijin Limited, thickness: 60 µm).

Example 3 A hand-cut base material sheet was formed from a uniaxially stretched polypropylene film (trade name "Nisseki Valleyr Film PGS25", manufactured by Nisseki Plast Co., Ltd., thickness: 25 μm).
The adhesive seal tape was obtained in the same manner as in Example 1 except that the adhesive seal tape was changed.

Example 4 70 parts by weight of butyl acrylate, 30 parts by weight of lauryl acrylate, 4 parts by weight of acrylic acid, 0.02 parts by weight of n-dodecanethiol, 2,2-dimethyl-2- An adhesive seal tape was obtained in the same manner as in Example 1, except that phenylacetophenone was changed to 0.1 part by weight and hexanediol diacrylate to 0.05 part by weight. The tensile modulus of the acrylic pressure-sensitive adhesive obtained above was 0.9 g / m
m ² , and the breaking strength was 400%.

Comparative Example 1 80 parts by weight of 2-ethylhexyl acrylate, 20 parts by weight of acrylic acid, 0.01 part by weight of n-dodecanethiol,
2,2-dimethyl-2-phenylacetophenone 0.1
An adhesive seal tape was obtained in the same manner as in Example 1 except that the weight part was changed to 0.05 parts by weight of hexanediol diacrylate. The acrylic pressure-sensitive adhesive obtained above had a tensile modulus of 2.0 g / mm ² and a breaking strength of 200 g / mm ² .
%Met.

(Comparative Example 2) Using a solvent-type rubber-based pressure-sensitive adhesive (manufactured by Toyo Ink Mfg. Co., Ltd., trade name "BPS375-1"), a thickness subjected to a release treatment so that the thickness after drying becomes 500 μm. A pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive layer was applied to a release surface of a 38 μm polyester film and dried at 100 ° C. for 3 minutes to form a pressure-sensitive adhesive layer. The tensile modulus of this rubber-based adhesive is 0.5 g / mm.
^{2. The} breaking strength was 150%.

Comparative Example 3 An adhesive seal tape was prepared in the same manner as in Example 1 except that a polyester film (trade name "Lumirror # 38", manufactured by Toray Industries Inc.) was used instead of the hand-cut base sheet. I got

(Evaluation) Using the apparatus shown in FIG.
The gap between the column and the base 4 through which the column penetrated was sealed with an adhesive seal tape as shown in FIG. 1, and the workability and finished appearance were evaluated. Further, the equivalent gap area was measured using the following formula, and the difference was obtained as a blank when the sealing was not performed with the adhesive sealing tape. The results are shown in Table 1. 2, 5 is a differential pressure gauge, 6 is an air supply fan,
Reference numeral 7 denotes an anemometer.

Equation for calculating equivalent clearance area αA (cm ² ) αA = 2.78 × √ (γ / 2gQ ₀ ) γ: Specific weight of air [kg / cm ³ ] g: Gravitational acceleration [m / s ² ] Q ₀ : Leakage amount [m ³ ] when the pressure difference between indoor and outdoor is 1 mmAq

[0037]

[Table 1]

[0038]

According to the adhesive seal tape of the first aspect of the present invention, no gaps or wrinkles are generated even when the adhesive tape is overlapped and adhered to seal the joint of a building having a gap. Can be reliably sealed. Therefore, it is highly practical for waterproofing, moistureproofing, and airtightness in the gap between the floor or the wall and the pillar penetrating therethrough. Further, in the pressure-sensitive adhesive seal tape according to the second aspect of the present invention, since the flexibility of the pressure-sensitive adhesive layer is further increased, no gaps or wrinkles are generated even when the pressure-sensitive adhesive layers are adhered to each other, so that the bonding gap is securely sealed. It is something that can be done.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state of being sealed using an adhesive seal tape of the present invention.

FIG. 2 is a side view showing an apparatus for evaluating practicality.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a perspective view showing a conventional sealing state.

[Explanation of symbols]

 1: Base sheet 2: Adhesive 3: Column 4: Stand 5: Differential pressure gauge 6: Air supply fan 7: Anemometer F: Floor

Claims (2)

[Claims] 1. An Elmendorf tear strength of 3 to 500 gf.
An acrylic pressure-sensitive adhesive layer having a tensile modulus of elasticity of 1 g / mm ² or less, a breaking elongation of 300% or more, and a thickness of 0.05 to 5 mm on one surface of a base sheet of Adhesive sealing tape characterized by having laminated thereon. 2. An acrylic pressure-sensitive adhesive comprising, as a main component, an acrylic copolymer obtained by copolymerizing 5 to 60% by weight of an alkyl (meth) acrylate having an alkyl group having 11 to 18 carbon atoms. The adhesive seal tape according to claim 1, wherein