JP2008179668A - Sealing tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing tape that requires neither skill for application nor ageing after application and exhibits high sealability due to its excellent follow-up properties to uneven surfaces, and durability enough to endure outdoor uses. <P>SOLUTION: The sealing tape comprises a film composed of an ionomer resin and, formed on one surface thereof, a pressure-sensitive adhesive layer. Preferably, the thickness of the pressure-sensitive adhesive layer is 0.15-1.00 mm and the pressure-sensitive adhesive layer is formed of a solution-type acrylic pressure-sensitive adhesive. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seal tape in which an adhesive layer is provided on one side of an ionomer resin film. More specifically, the seal tape does not require skill for construction, does not require curing after construction, and has a high sealing performance because of excellent followability to uneven surfaces, and has durability that can withstand outdoor use. It is about.

  Metal panels such as iron plates and aluminum plates are used in the assembly of transportation equipment such as automobiles, trucks, railroads, airplanes, home appliances such as refrigerators and washing machines, and structures in houses and buildings. The panel members are assembled by stacking the end portions thereof and fixing them by riveting, screwing, or the like. And it is necessary to perform the sealing process in order to prevent ingress of water in the level difference part of the overlapping part of those member panels, or the junction part by a screw, a rivet, etc.

As such a sealing process, a liquid sealing material is generally widely used.
The sealing process by applying such a liquid sealing material uses a method of adhering the sealing material using, for example, a cartridge gun. However, since a certain sealing property and aesthetics are required, there are the following problems. there were.
(1) The construction of the sealing material requires skill and requires a lot of work time.
(2) It takes time from construction to curing, and it is impossible to perform an operation in which an external force is applied to the construction part until curing, and curing is necessary before curing.

  Therefore, in order to solve these problems, in recent years, for example, a waterproof tape in which a pressure-sensitive adhesive composition based on butyl rubber is applied to one of base materials obtained by laminating a polyester film and an aluminum foil ( Patent document 1) etc. are used.

JP-A-11-106720

However, although such a conventional waterproof tape is excellent in workability compared with a liquid sealing material, it still has the following problems.
(1) Since the tape base material is a sheet with polyester film and aluminum foil bonded together, the tape is not flexible enough, and when it is bonded to uneven surfaces such as overlapping parts of the panel, the tape is sufficient for the adherend. Therefore, the sealing performance is insufficient.
(2) Since a pressure-sensitive adhesive composition based on butyl rubber is used, the pressure-sensitive adhesive may flow and contaminate the surroundings when used in a part exposed to direct sunlight in summer.

  The present invention has been made to solve the above-mentioned problems, does not require skill in construction, does not require curing after construction, and has excellent sealing performance due to excellent followability to uneven surfaces. And it aims at providing the sealing tape which has durability which can endure outdoor use.

  As a result of diligent research, the present inventors have found that the above problems can be solved by using a single-sided adhesive tape provided with an adhesive layer on one side of a highly flexible ionomer resin film as a sealing tape. It came to complete.

  That is, 1st invention is related with the sealing tape characterized by the adhesive layer being provided in one side of the film which consists of ionomer resin.

  The second invention relates to a seal tape according to the first invention, wherein the pressure-sensitive adhesive layer has a thickness of 0.15 mm to 1.00 mm.

  The third invention relates to a sealing tape according to the first or second invention, wherein the pressure-sensitive adhesive layer is formed of a solvent-type acrylic pressure-sensitive adhesive.

  The fourth invention relates to a seal tape according to the first to third inventions, wherein the pressure-sensitive adhesive layer comprises a solvent-type acrylic pressure-sensitive adhesive containing a colorant.

  The fifth invention relates to a seal tape according to the first to fourth inventions, wherein the thickness of the ionomer resin film is 0.05 mm to 0.30 mm.

  By using the sealing tape according to the present invention, when sealing the stepped portion of the overlapping part of the panel member or the screwed or riveted portion, no construction skill is required and the construction time can be shortened. Thus, there is no need for curing after construction, and there is an effect that good sealing properties and weather resistance can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail. In addition, this invention is not limited only to these illustrations, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

[Configuration of Seal Tape According to the Present Invention]
The structure of the sealing tape according to the present invention is shown in FIG.
The sealing tape according to the present invention basically has an ionomer resin film (A) (1 in the figure) as a support, an adhesive layer (B) (2 in the figure) formed on one side thereof, and a separator ( C) (3 in the figure).

[About ionomer resin film (A)]
The “ionomer resin” in the present invention is a polymer in which some or all of the carboxyl groups in a copolymer of an olefin and an α, β-unsaturated carboxylic acid are ionically crosslinked between molecules by a metal cation. It is a resin. Examples of the olefin used for the ionomer resin include known olefins such as ethylene and propylene. Examples of the α, β-unsaturated carboxylic acid include acrylic acid and methacrylic acid. Examples of the metal cation include cations of any metal such as alkaline earth metal (sodium, potassium, magnesium, etc.), alkali metal, zinc, silver, copper and the like.

  In addition, various additives such as an antioxidant (anti-aging agent), a heat stabilizer, a light stabilizer, and an ultraviolet absorber may be added to the ionomer resin as necessary. In particular, in applications exposed to direct sunlight outdoors, add antioxidants (anti-aging agents), heat stabilizers, light stabilizers, and UV absorbers to improve weather resistance and discoloration resistance. Is preferred.

  Furthermore, the ionomer resin may be transparent or opaque depending on the necessity and application. Moreover, in order to improve aesthetics, colorants such as titanium white, carbon black, aluminum flakes, and azo red pigments may be added.

  The ionomer resin film is obtained by molding the above ionomer resin into a film shape, and the thickness can be varied depending on the application, but is usually in the range of 0.01 mm to 1.00 mm. The thickness is preferably 0.05 to 0.30 mm. If the thickness of the ionomer resin film is less than 0.05 mm, the strength of the film is lowered. For example, when a person steps on the tape while the tape is attached to the member, the film is torn and the sealing property is improved. It can no longer be obtained. On the other hand, when the thickness is 0.30 mm or more, the tape cannot follow the steps of the overlapping panels, the rivets or the unevenness of the screws, which adversely affects the water stoppage.

  Further, in order to enhance the adhesiveness between the ionomer resin film and the pressure-sensitive adhesive layer, a corona discharge treatment or a plasma discharge treatment may be applied to the pressure-sensitive adhesive layer coated surface of the ionomer resin film prior to the application of the pressure-sensitive adhesive layer. Or you may provide a primer layer in the adhesive layer coating surface of an ionomer resin film.

  Commercially available products of the above ionomer resins include “HIMILAN 1554”, “HIMILAN 1601”, “HIMILAN 1650”, “HIMILAN 1652UV”, “HIMILAN 1702”, “HIMILAN 1856” manufactured by Mitsui DuPont Chemical Co., Ltd. It is done. Examples of commercially available ionomer resin films include “HM-07” and “HM-52” manufactured by Tamapoli Co., Ltd.

[Adhesive layer (B)]
A conventionally well-known adhesive can be used as an adhesive used for the adhesive layer (B) in the sealing tape of this invention. Examples include acrylic adhesives, natural rubber adhesives, synthetic rubber adhesives, urethane adhesives, silicone adhesives, etc., but good weather resistance and good adhesion to a wide range of substrates. Therefore, an acrylic pressure-sensitive adhesive is preferable.

  Here, the acrylic pressure-sensitive adhesive is, for example, an alcohol (meth) acrylate monomer having an alkyl group having 1 to 12 carbon atoms, preferably an alkyl group having 4 to 12 carbon atoms ( A homopolymer of a meth) acrylate monomer or a copolymer of (meth) acrylate monomers, or a polymerizable monomer copolymerizable with the (meth) acrylate monomer and the (meth) acrylate monomer (Acrylic acid and methacrylic acid may be collectively referred to as “(meth) acrylic acid”).

  The (meth) acrylic acid ester monomer having an alkyl group having 4 to 12 carbon atoms in the alkyl group is not particularly limited. For example, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, Examples thereof include isooctyl (meth) acrylate, n-octyl (meth) acrylate, isononyl (meth) acrylate, lauryl (meth) acrylate, and the like. These can be used singly or in combination, but in order to achieve excellent balance between the tackiness of the resulting pressure-sensitive adhesive and the cohesion and cohesiveness, the glass transition temperature of the homopolymer ( Tg) is mainly composed of (meth) acrylic acid alkyl ester having a temperature of −50 ° C. or lower, and is further used in combination with (meth) acrylic acid ester of lower alcohol such as methyl (meth) acrylate and ethyl (meth) acrylate. It is preferable.

  Moreover, as a monomer copolymerizable with these (meth) acrylic acid ester monomers, carboxyl group-containing monomers such as (meth) acrylic acid, maleic acid, fumaric acid, itaconic acid or anhydrides thereof and (meth) acrylic acid Examples include hydroxyl group-containing monomers such as 2-hydroxyethyl, 4-hydroxybutyl (meth) acrylate, polyoxyethylene (meth) acrylate, polyoxypropylene (meth) acrylate, and caprolactone-modified (meth) acrylate.

In addition, as other polymerizable monomer components, a polymerizable monomer for adjusting the glass transition point and peelability of the (meth) acrylic polymer can be used as long as the effects of the present invention are not impaired. .
Other polymerizable monomer components include, for example, components for improving cohesion and heat resistance such as sulfonic acid group-containing monomers, phosphate group-containing monomers, cyano group-containing monomers, vinyl esters, aromatic vinyl compounds, and carboxyl Adhesion improvement and crosslinking of group-containing monomer, acid anhydride group-containing monomer, hydroxyl group-containing monomer, amide group-containing monomer, amino group-containing monomer, imide group-containing monomer, epoxy group-containing monomer, N-acryloylmorpholine, vinyl ethers, etc. A component having a functional group serving as a linking base point can be used as appropriate. Other components can be used alone or in combination of two or more.

  As the above-mentioned acrylic pressure-sensitive adhesive, conventionally known ones can be used, a solvent-type pressure-sensitive adhesive in which an acrylic polymer is dissolved in an organic solvent, a 100% resin part hot-melt pressure-sensitive adhesive, an ultraviolet curable pressure-sensitive adhesive, and an aqueous medium. As needed, it can be used from the emulsion type adhesive in which the adhesive emulsion polymer was disperse | distributed. Among them, the solvent-type acrylic pressure-sensitive adhesive is particularly preferable because it is excellent in adhesion to various adherends, heat resistance and water resistance, and can easily add a colorant as required. . In general, emulsion-type acrylic pressure-sensitive adhesives tend to have insufficient water resistance because they contain emulsifiers, and hot-melt-type acrylic pressure-sensitive adhesives tend to have insufficient heat resistance. In addition, since UV curable acrylic pressure-sensitive adhesives need to be UV transmissive when irradiated with UV rays, the addition of a colorant may cause problems that UV transmissive properties deteriorate and curability decreases. There is sex.

  The acrylic pressure-sensitive adhesive may be transparent or opaque depending on the necessity and application. In order to improve aesthetics, a colorant such as titanium white, carbon black, aluminum flakes, and azo red pigment may be added.

  The acrylic pressure-sensitive adhesive may further contain, for example, an isocyanate-based, epoxy-based, or metal chelate-based cross-linking agent to adjust the adhesive force. The content of the crosslinking agent is not particularly limited, and is usually 0.01 to 5.0% by weight with respect to the acrylic resin in the pressure-sensitive adhesive.

  In addition, various additions such as tackifiers, inorganic or organic fillers, antioxidants (anti-aging agents), heat stabilizers, light stabilizers, UV absorbers, etc., may be added to acrylic adhesives as necessary. An agent may be added.

  Commercially available acrylic adhesives include “KH100ANT” (solvent type), “KH54NT” (solvent type), “CW-1” (emulsion type) manufactured by Konishi Co., Ltd., and “1700” manufactured by Soken Chemical Co., Ltd. (Solvent type), “E-1000” (emulsion type), “Alloset 8850E” (solvent type) manufactured by Nippon Shokubai Co., Ltd., and the like.

  The coating thickness of the pressure-sensitive adhesive layer (B) can be varied depending on the application, but is usually in the range of 0.05 mm or more and less than 2.00 mm in dry thickness, preferably 0.15 mm or more. It is less than 1.00 mm. If the thickness of the pressure-sensitive adhesive layer is less than 0.15 mm, it may not be possible to follow the steps of the overlapping portion of the panel or the unevenness of the rivets, and the sealing performance may be insufficient. Further, when the thickness of the pressure-sensitive adhesive layer is 1.00 mm or more, when a solvent-type pressure-sensitive adhesive is used, it is necessary to dry a large amount of solvent, which causes a problem that productivity is remarkably deteriorated.

[Separator (C)]
In the seal tape according to the present invention, a separator (C) can be provided for the purpose of protecting the pressure-sensitive adhesive layer (B) in the distribution process after production. However, a separator may not necessarily be required depending on the product form.
A conventionally well-known separator base material can be used as a separator (C) used for the sealing tape which concerns on this invention. Examples thereof include plastic films such as polyethylene terephthalate, polyethylene, and polypropylene, and paper. Paper is preferable in terms of availability, ease of use, and price.

EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to an Example.
By using an ionomer film as the base material of the seal tape, the present invention has an excellent followability with respect to an uneven surface, so that a seal tape having high sealing performance and durability that can withstand outdoor use is obtained. It should be interpreted as based on knowledge.

[Example 1]
An ionomer resin (“HIMILAN 1652UV” manufactured by Mitsui DuPont Chemical Co., Ltd.) was formed by T-die extrusion to a thickness of 0.10 mm to prepare a tape support.
Next, 100 parts by mass of a solvent-type acrylic pressure-sensitive adhesive (“KH100ANT” manufactured by Konishi Co., Ltd., non-volatile content 45%, ethyl acetate solution) and polyisocyanate (“Coronate L” manufactured by Nippon Polyurethane Industry Co., Ltd.) 1 part by weight of non-volatile content 75%, ethyl acetate solution), 0.1 part by weight of colorant (“NV-6-3046” manufactured by Nippon Pigment Co., Ltd.) are added and mixed until uniform. A liquid was created.
The obtained pressure-sensitive adhesive compounded liquid was applied to the release-treated surface of a single-sided silicone-treated paper separator (“SLK80KCZ” manufactured by Sumika Kogyo Co., Ltd.) so that the thickness after drying was 100 μm. After drying for a minute to form a pressure-sensitive adhesive layer, it was bonded to a tape support to obtain a “single-sided pressure-sensitive adhesive tape (I)” using an ionomer film having a pressure-sensitive adhesive layer thickness of 100 μm as a support.
Separately from the above, the pressure-sensitive adhesive compounded liquid was applied to the release-treated surface of a single-sided silicone-treated paper separator (“SLK80KCZ” manufactured by Sumika Kogyo Co., Ltd.) so that the thickness after drying was 100 μm. Was dried for 5 minutes to form an “adhesive layer (b)” having a thickness after drying of 100 μm.
The obtained “pressure-sensitive adhesive layer (b)” was laminated on the pressure-sensitive adhesive layer surface of “single-sided pressure-sensitive adhesive tape (b)”, and an ionomer film having a total pressure-sensitive adhesive layer thickness of 200 μm was used as a support. The “single-sided adhesive tape (I) was obtained.

[Example 2]
An ionomer film in which the thickness of the pressure-sensitive adhesive layer is 300 μm by laminating two layers of “pressure-sensitive adhesive layer (b)” on the pressure-sensitive adhesive layer surface of “single-sided pressure-sensitive adhesive tape (b)” in the same manner as in Example 1. As a support, a “single-sided adhesive tape (II)” was obtained.

[Example 3]
An ionomer film in which the thickness of the pressure-sensitive adhesive layer is 800 μm by laminating 7 layers of “pressure-sensitive adhesive layer (b)” on the surface of the pressure-sensitive adhesive layer of “single-sided pressure-sensitive adhesive tape (b)” in the same manner as in Example 1. A “single-sided adhesive tape (III)” having a support as a support was obtained.

[Comparative Example 1]
The “single-sided pressure-sensitive adhesive tape (IV)” in Example 1 was used as it was, and the “single-sided pressure-sensitive adhesive tape (IV)” using an ionomer film having a pressure-sensitive adhesive layer thickness of 100 μm as a support was obtained.

[Comparative Example 2]
Instead of the pressure-sensitive adhesive compounded liquid of Example 1, 100 parts by mass of an aqueous acrylic pressure-sensitive adhesive (“CW1” manufactured by Konishi Co., Ltd., non-volatile content: 59%) was added to an isocyanate curing agent (“CW curing agent manufactured by Konishi Co., Ltd.). -1 ") 0.5 parts by mass was added and mixed until uniform, otherwise the same procedure as in Example 1 was conducted, except that" single-sided adhesive "using an ionomer film having a pressure-sensitive adhesive layer thickness of 200 µm as a support. Tape (V) "was obtained.

[Comparative Example 3]
In place of the tape support of Example 1, a 0.1 mm-thick polyethylene film (“Emasoft 3C” manufactured by Okamoto Co., Ltd.) was used. Otherwise, the pressure-sensitive adhesive layer thickness was 200 μm. A “single-sided adhesive tape (VI)” having a polyethylene resin film as a support was obtained.

[Evaluation methods]
After the obtained “single-sided adhesive tapes (I) to (VI)” were cured at 23 ° C. for 1 week, the following performance evaluation test was performed.

(1) Convex / concave surface followability One aluminum plate having a length of 100 mm × width of 100 mm × thickness of 2 mm and two aluminum plates having a length of 100 mm × width of 25 mm × thickness of 2 mm are combined with a PET film-based double-sided adhesive tape ( Bonding is performed using “WF205” manufactured by Konishi Co., Ltd./thickness 115 μm / 5 in the figure) to form an adherend having a step of 2.1 mm (FIG. 2).
A tape having a length of 80 mm and a width of 80 mm was bonded to the adherend with the concave portion (stepped portion) floating (FIG. 3).
Thereafter, the tape was pushed from the surface of the ionomer film so that the tape followed the adherend, and bonding was performed (FIG. 4).
After this test specimen was left in an oven at 40 ° C. for 7 days, the total length of tape floating (the sum of a1 and a2) generated in the stepped portion was measured and evaluated according to the following criteria (FIG. 5).
○: Total length of tape floating is less than 3 mm ×: Total length of tape floating is 3 mm or more

(2) Water resistance A tape having a width of 25 mm × a length of 80 mm was bonded to an aluminum plate having a width of 30 mm × a length of 100 mm × a thickness of 2 mm, and left at 23 ° C. for 3 days. This specimen was left in warm water at 40 ° C. for 14 days, the state of the tape was visually confirmed, and evaluation was performed according to the following criteria.
○: No change in tape state before and after immersion in warm water. ×: Whitening is observed in the adhesive layer of the tape after immersion in warm water.

(3) Weather resistance A tape 25 mm wide × 80 mm long was bonded to an aluminum plate 30 mm wide × 100 mm long × 2 mm thick and left at 23 ° C. for 3 days. The test specimen was visually inspected for 1000 hours after being irradiated for 1000 hours under the conditions of Sunshashin Weather Meter (manufactured by Suga Test Instruments Co., Ltd., black panel temperature 63 ° C., 1 cycle time 120 minutes (rainfall time 18 minutes)). The evaluation is based on the following criteria.
○: No change in tape appearance before and after irradiation ×: Deterioration or discoloration of tape is observed after irradiation

[Table 1]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Tape I II III IV V VI
────────────────────────────────────────
Base material * 1 A A A A A E
Adhesive thickness * 2 200 300 800 100 200 200
Adhesive type Solvent Solvent Solvent Solvent Water Soluble Solution━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ━━━━━
Concavity and convexity followability ○ ○ ○ × ○ ○
Float length * 3 2.0 1.5 1.0 3.8 2.0 2.0
────────────────────────────────────────
Water resistance ○ ○ ○ ○ × ○
────────────────────────────────────────
Weather resistance ○ ○ ○ ○ ○ ×
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
* 1: A = ionomer resin film / E = polyethylene film * 2: Unit = μm
* 3: Unit = mm

The evaluation results of Examples and Comparative Examples are shown in Table 1.
As is clear from the results in Table 1, single-sided adhesive tapes (I) to (III) that support the ionomer resin film as an example according to the present invention are single-sided adhesive tapes having a conventional adhesive layer of 100 μm ( It can be seen that the uneven surface followability is superior to that of IV).
In addition, the water resistance is good in the single-sided adhesive tapes (I) to (III) using the solvent-type acrylic adhesive according to the present invention, whereas the single-sided adhesive tape using the aqueous acrylic adhesive ( In V), the pressure-sensitive adhesive layer was whitened.
Furthermore, the weather resistance is good in the single-sided adhesive tapes (I) to (III) using the ionomer resin film according to the present invention as a support, whereas the single-sided adhesive tape using a polyethylene film as a tape support. In (VI), deterioration was observed.

  The single-sided adhesive tape using the ionomer resin film as a support according to the present invention is a metal panel member in the assembly of automobiles, trucks, railways, aircraft and other transportation equipment, refrigerators, washing machines and other household appliances, and housing and building structures. It can be suitably used for the purpose of sealing in the overlapping portion. Moreover, it does not require skill in construction, does not require curing after construction, and has excellent sealing performance because of its excellent followability to uneven surfaces, and has durability that can withstand outdoor use.

It is explanatory drawing which shows the basic composition of the sealing tape which provided the adhesive layer on the single side | surface of the ionomer resin film of this invention. It is explanatory drawing which shows the to-be-adhered body which evaluates the uneven | corrugated surface followable | trackability of a tape. It is explanatory drawing which shows the state which bonded the tape to the to-be-adhered body, when evaluating the uneven surface followable | trackability of a tape. When evaluating uneven | corrugated surface followability of a tape, it is explanatory drawing which shows the bonding state immediately after pushing in a tape and making it follow an adherend. It is explanatory drawing which shows the length of the floating of a tape when evaluating the uneven | corrugated surface followable | trackability of a tape.

Explanation of symbols

1: Ionomer resin film (A)
2: Adhesive layer (B)
3: Separator (C)
4: Aluminum plate 5: Double-sided tape 6: Seal tape a1: Length of tape floating a2: Length of tape floating

Claims (5)

  A sealing tape, wherein an adhesive layer is provided on one surface of a film made of an ionomer resin.   The sealing tape according to claim 1, wherein the pressure-sensitive adhesive layer has a thickness of 0.15 mm to 1.00 mm.   The sealing tape according to claim 1, wherein the pressure-sensitive adhesive layer is formed of a solvent-type acrylic pressure-sensitive adhesive.   The sealing tape according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive layer comprises a solvent-type acrylic pressure-sensitive adhesive containing a colorant.   The sealing tape according to any one of claims 1 to 4, wherein the film made of the ionomer resin has a thickness of 0.05 mm to 0.30 mm.

Images