WO2015151173A1

WO2015151173A1 - Adhesive composition, and adhesive tape using same

Info

Publication number: WO2015151173A1
Application number: PCT/JP2014/059493
Authority: WO
Inventors: 戸高　勝則; 靖史土屋; 一紀宮▲崎▼
Original assignee: 株式会社寺岡製作所
Priority date: 2014-03-31
Filing date: 2014-03-31
Publication date: 2015-10-08

Abstract

Provided is an adhesive composition which includes: an acrylic copolymer (A) which has a hydroxyl group and a carboxyl group, has a weight average molecular weight of 400000-700000, has a theoretical Tg of -70 ˚C or lower, and includes, as constituent components, 50-90 mass% of a (meth)acrylic acid alkyl ester (A1) having a C4-12 alkyl group, 3-10 mass% of a (meth)acrylic acid alkyl ester (A2) having a C1-3 alkyl group, 1-10 mass% of a carboxyl-group-containing monomer (A3), and 0.5-2 mass% of a hydroxyl-group-containing monomer (A4); a crosslinking agent (B); and a tackifier resin (C). The adhesive composition exhibits excellent adhesive properties at both high and low temperatures, excellent load resistance, excellent rough-surface adhesive properties, and excellent impact resistance. Also provided is an adhesive tape which uses said adhesive composition.

Description

Adhesive composition and adhesive tape using the same

The present invention relates to a pressure-sensitive adhesive composition having excellent adhesion at any temperature from low to high temperatures, excellent load resistance, and excellent rough surface adhesion and impact resistance, and a pressure-sensitive adhesive tape using the same About.

In recent years, electronic control of automobiles has progressed, and many electric wires are installed in various places in the car. In the automobile manufacturing process, modularization of materials used is progressing in consideration of efficiency in the process. And when installing an electric wire between the ceiling of a motor vehicle and a ceiling material, it is common to fix an electric wire to a ceiling material using an adhesive tape (refer patent document 1 and patent document 2). However, the ceiling material is mainly made of a resin-based composite material such as PET or PP, and its surface is rough, and the adhesive tape is difficult to adhere to.

Also, in the automobile manufacturing process, it is important to improve work efficiency to reduce costs. Therefore, an adhesive tape excellent in workability that can be bonded to a ceiling material in a short time under various environments is desired.

In addition, the member with the wiring fixed to the ceiling material may be transported as it is, and if the member falls by mistake at that time, the wiring may come off from the roof material due to the impact. is there. Therefore, if an adhesive tape with poor workability is used, even if the cost of the adhesive tape alone is low, it takes time for the bonding operation, leading to a total cost increase. In addition, since it may be exposed to low to high temperatures depending on the usage environment of the automobile after being incorporated in a vehicle, reliability of adhesion in a wide temperature range (for example, a range of −20 to 100 ° C.) is required. .

Conventional pressure-sensitive adhesive tapes use a polymer component having a glass point transition temperature (Tg) of −60 ° C. or lower as a pressure-sensitive adhesive component, thereby lowering the glass transition temperature and providing a tackifier (such as a tackifier resin). The composition is not added. Therefore, there is a problem that it is difficult to adhere depending on the material of the ceiling material used. In order to improve the adhesiveness, for example, the pressure-sensitive adhesive layer is thickened, and thus there are problems in adhesiveness, cost, work efficiency, followability to electric wires, and the like.

Another conventional technique is an acrylic polymer in which the alkyl group (meth) acrylic acid alkyl ester having 2 to 18 carbon atoms is 95 to 99% by weight based on the total amount of monomer components constituting the polymer, and softening It has a pressure-sensitive adhesive layer formed of an acrylic pressure-sensitive adhesive composition having a glass transition temperature of −30 to −60 ° C., which contains a polymerized rosin ester-based tackifying resin having a point of 80 to 170 ° C. There are pressure-sensitive adhesive tapes or sheets for fixing wirings in a vehicle roof module (see Patent Document 3 and Patent Document 4). However, this technology has few polar groups in the polymer and is inferior in adhesiveness from low to high temperatures (-20 ° C to 100 ° C). It cannot withstand the impact that occurs when it is dropped. Moreover, since there are too many amounts of the (meth) acrylic-acid alkylester in an adhesive, it is inferior to the adhesiveness to a rough surface.

As another technique, (meth) acrylic acid alkyl ester having 2 to 18 carbon atoms in the alkyl group, a copolymerizable monomer having a polar group, and an olefin polymer having a polymerizable unsaturated double bond at the terminal are provided. 10 to 50 parts by weight of a petroleum resin and 5 to 20% by weight of a copolymer of an olefin polymer with respect to 100 parts by weight of an acrylic copolymer obtained by polymerizing a polymerizable composition having a main component. There exists an adhesive composition characterized by being (refer patent document 5). However, although this technique can provide adhesion at low temperatures and adhesion to rough surfaces, it cannot obtain sufficient adhesion on the high temperature side because it uses a petroleum resin and an olefin polymer.

In general, pressure-sensitive adhesive compositions are roughly classified into two types: rubber-based pressure-sensitive adhesive compositions and acrylic-based pressure-sensitive adhesive compositions. The rubber-based pressure-sensitive adhesive composition is excellent in adhesiveness at room temperature, but is inferior in high temperature characteristics and weather resistance. On the other hand, the acrylic pressure-sensitive adhesive composition is excellent in adhesiveness and weather resistance at high temperatures. In addition, the acrylic pressure-sensitive adhesive composition uses a (meth) acrylic polymer as the polymer component of the adhesive component, and has a tack feeling in itself, so that even if no tackifying resin is added, it is pressure sensitive. Can be an adhesive. However, the adhesive strength to plastic materials such as polyolefin is low. Therefore, a tackifying resin is added to improve the adhesive force.

Patent No. 2946914 Japanese Patent Laying-Open No. 2005-8654 Patent No. 4493289 Patent No. 5063128 Japanese Patent Laid-Open No. 2003-3141

An object of the present invention is to use a pressure-sensitive adhesive composition having excellent adhesion at any temperature from low to high temperatures, excellent load resistance, and excellent rough surface adhesion and impact resistance, and the same. It is to provide an adhesive tape.

The present invention relates to (meth) acrylic acid alkyl ester (A1) having an alkyl group having 4 to 12 carbon atoms (A1), and (meth) acrylic acid alkyl ester having an alkyl group having 1 to 3 carbon atoms. (A2) 3 to 10% by mass, carboxyl group-containing monomer (A3) 1 to 10% by mass, and hydroxyl group-containing monomer (A4) 0.5 to 2% by mass are included as constituents, and the weight average molecular weight is 400,000 to 70. An acrylic copolymer (A) having a hydroxyl group and a carboxyl group having a theoretical Tg of −70 ° C. or lower,
A crosslinking agent (B);
A pressure-sensitive adhesive composition containing a tackifier resin (C).

Moreover, this invention is a single-sided or double-sided adhesive tape which has the adhesive layer formed from said adhesive composition on the single side | surface or both surfaces of a base material.

The pressure-sensitive adhesive tape using the pressure-sensitive adhesive composition of the present invention has excellent adhesion at any temperature from low to high temperatures, has excellent load resistance, and is excellent in rough surface adhesion and impact resistance. . For example, when the pressure-sensitive adhesive tape of the present invention is used to fix an electric wire to a member such as a ceiling material of a vehicle such as an automobile, it can be bonded in a short time and is not easily peeled off. Even if a member such as a ceiling material becomes hot or cold depending on the use environment, the electric wire can be fixed stably.

It is a schematic diagram for demonstrating the measuring method of the high temperature retainability of Example and PP adhesiveness. It is a schematic diagram for demonstrating the measuring method of the low temperature retainability of an Example. It is a schematic diagram for demonstrating the measuring method of the low temperature retainability of an Example. It is a schematic diagram for demonstrating the measuring method of the impact resistance of an Example.

The pressure-sensitive adhesive composition of the present invention is a composition containing an acrylic copolymer (A), a crosslinking agent (B), and a tackifier resin (C).

The acrylic copolymer (A) comprises (meth) acrylic acid alkyl ester (A1), (meth) acrylic acid alkyl ester (A2), carboxyl group-containing monomer (A3), and hydroxyl group-containing monomer (A4) described below. ) As a constituent component, and an acrylic polymer having a hydroxyl group and a carboxyl group. “(Meth) acryl” is a general term for acrylic and methacrylic.

(Meth) acrylic acid alkyl ester (A1) is a (meth) acrylic acid alkyl ester having an alkyl group having 4 to 12 carbon atoms. Specific examples include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (Meth) acrylate, isononyl (meth) acrylate, lauryl (meth) acrylate may be mentioned. Two or more of these may be used in combination. Of these, 2-ethylhexyl (meth) acrylate and isooctyl (meth) acrylate are preferable.

(Meth) acrylic acid alkyl ester (A2) is a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 3 carbon atoms. Specific examples include methyl (meth) acrylate, ethyl (meth) acrylate, and propyl (meth) acrylate. Of these, methyl (meth) acrylate is preferred. Two or more of these may be used in combination. Of these, methyl (meth) acrylate and ethyl (meth) acrylate are preferable.

The carboxyl group-containing monomer (A3) is a component that improves high temperature retention and load resistance by giving a suitable proportion of carboxyl groups to the acrylic copolymer (A). Specific examples thereof include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, 2-carboxy-1-butene, 2-carboxy-1-pentene, 2-carboxy-1-hexene, 2- Carboxy-1-heptene is mentioned. Two or more of these may be used in combination. Of these, acrylic acid and methacrylic acid are preferable.

The hydroxyl group-containing monomer (A4) is a component that improves the low temperature sticking property and the low temperature retention property by giving a suitable proportion of hydroxyl groups to the acrylic copolymer (A). Specific examples thereof include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate. Two or more of these may be used in combination. Of these, 2-hydroxyethyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate are preferable.

In 100% by mass of the constituent component (monomer unit) of the acrylic copolymer (A), the content of the component (A1) is 50 to 90% by mass (preferably 70 to 90% by mass), and the component (A2) The content is 3 to 10% by mass (preferably 3 to 7% by mass), the content of component (A3) is 1 to 10% by mass (preferably 5 to 8% by mass), and the content of component (A4) is 0 0.5 to 2% by mass (preferably 0.5 to 1.5% by mass). The total content of the component (A3) and the component (A4) is preferably 4.5% by mass or more (preferably 6 to 10% by mass).

In addition, the acrylic copolymer (A) preferably further contains vinyl acetate (A5) as a constituent component from the viewpoint of improving adhesiveness and impact resistance. In 100% by mass of the constituent component (monomer unit) of the acrylic copolymer (A), the content of the component (A5) is preferably 2 to 10% by mass, more preferably 2 to 5% by mass.

Further, the acrylic copolymer (A) may further contain a monomer other than the components (A1) to (A5) as a constituent component within the range not impairing the effects of the present invention.

The acrylic copolymer (A) can be obtained by copolymerizing the monomers described above. The polymerization method is not particularly limited, but radical solution polymerization is preferable from the viewpoint of easy polymer design. Alternatively, an acrylic syrup composed of the acrylic copolymer (A) and its monomer may be prepared first, and the acrylic syrup may be blended with a crosslinking agent (B) and an additional photopolymerization initiator for polymerization.

The weight average molecular weight of the acrylic copolymer (A) is 300,000 to 700,000, preferably 400,000 to 500,000. The lower limit of these ranges is significant in terms of load resistance and workability. The upper limit is significant in terms of coating properties of the pressure-sensitive adhesive composition, load resistance at low temperatures and adhesiveness. This weight average molecular weight is a value measured by the GPC method.

The theoretical Tg of the acrylic copolymer (A) is −70 ° C. or less, preferably −70 to −80. This theoretical Tg is a value calculated by the formula of FOX.

The crosslinking agent (B) used in the present invention is a compound for reacting with the acrylic copolymer (A) to form a crosslinked structure. In particular, a compound capable of reacting with a carboxyl group and / or a hydroxyl group of the acrylic copolymer (A) is preferred.

As the crosslinking agent (B), an isocyanate-based crosslinking agent is preferable. Thereby, a pressure-sensitive adhesive tape having excellent properties such as pressure-sensitive adhesive properties from low temperatures to high temperatures, load resistance, and rough surface adhesion can be obtained. Specific examples thereof include tolylene diisocyanate, xylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and modified prepolymers thereof. Two or more of these may be used in combination.

The amount of the crosslinking agent (B) is preferably 0.001 to 1 part by weight, more preferably 0.02 to 1 part by weight, and particularly preferably 0 to 100 parts by weight of the acrylic copolymer (A). 0.05 to 0.5 parts by mass.

The tackifier resin (C) used in the present invention is a compound that imparts further tackiness to the pressure-sensitive adhesive composition. Specific examples thereof include rosin tackifier resins, terpene tackifier resins, and xylene tackifier resins. Two or more of these may be used in combination. In particular, rosin-based tackifying resins and xylene-based imparting resins are preferable. The softening point of the tackifying resin (C) is preferably 70 to 150 ° C. This softening point is a value measured according to JIS K 2531 (ring and ball method).

The amount of the tackifying resin (C) is preferably 0.5 to 15 parts by mass, more preferably 3 to 10 parts by mass, and particularly preferably 6 to 10 parts by mass with respect to 100 parts by mass of the acrylic copolymer (A). 10 parts by mass.

The pressure-sensitive adhesive composition of the present invention may further contain an inorganic filler, a light-shielding filler, and a pigment. Specific examples of the inorganic filler include silica, calcium carbonate, and alumina. Specific examples of the light-shielding filler include carbon black, carbon nanotube, and black inorganic filler. Specific examples of the pigment include carbon black, aniline black, acetylene black, and ketjen black.

The pressure-sensitive adhesive tape of the present invention is a single-sided or double-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition of the present invention on one or both sides of a substrate. The thickness of the pressure-sensitive adhesive layer is preferably 5 to 1000 μm, more preferably 10 to 600 μm.

The pressure-sensitive adhesive layer can be formed by crosslinking reaction of the pressure-sensitive adhesive composition of the present invention. For example, the pressure-sensitive adhesive composition can be applied on a substrate and subjected to a crosslinking reaction by heating or ultraviolet irradiation to form a pressure-sensitive adhesive layer on the substrate. Further, for example, the pressure-sensitive adhesive composition is applied onto a release paper or other film, and is subjected to a crosslinking reaction by heating or ultraviolet irradiation to form a pressure-sensitive adhesive layer, and this pressure-sensitive adhesive layer is bonded to one or both sides of the substrate. You can also.

Examples of the material constituting the base material of the adhesive tape include plastic film, woven fabric, non-woven fabric, and foam. Two or more of these may be used in combination. In particular, a multilayer substrate (composite substrate) obtained by laminating two or more of these is preferable, a multilayer substrate obtained by laminating a plastic film and a nonwoven fabric, and a multilayer substrate obtained by laminating a plastic film and a woven fabric. A layer substrate is more preferred.

The multi-layer base material can suppress the elongation of the adhesive tape and is excellent in workability and workability when cutting with a hand or a cutter. Furthermore, when the multilayer substrate includes a nonwoven fabric, a woven fabric or a foam, the cushioning property is imparted to the substrate, so that the conformability to the adherend is improved, and as a result, the initial adhesiveness is improved. Moreover, the impact resistance after pasting is also improved. In particular, in applications where the wiring is fixed to the vehicle roof module, by making the base material multilayer, the deformation of the tape due to the weight of the wiring and the deformation of the tape due to vibration during running are suppressed, and the wiring Looseness and dropout are prevented.

The pressure-sensitive adhesive tape of the present invention has excellent load resistance and adhesion at −10 ° C. to 100 ° C. for rough surfaces such as PET spunlace, and also has excellent load resistance for olefins such as PP. , Adhesion and impact resistance. Therefore, it is very useful as a single-sided or double-sided adhesive tape for fixing a vehicle roof module and a wiring cable having excellent adhesion to a rough surface such as a PET spunlace.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. In the following description, “parts” means parts by mass, and “%” means mass%.

<Production Examples 1 to 19 (Preparation of acrylic copolymer (A))>
In a reactor equipped with a stirrer, thermometer, reflux condenser and nitrogen gas inlet tube, components (A1) to (A5) shown in Table 1, n-dodecanethiol as a chain transfer agent and AIBN 0.001 as a radical polymerization initiator. 1 part was loaded. Nitrogen gas was sealed in the reactor, and the polymerization reaction was carried out at 68 ° C. for 3 hours and then at 78 ° C. for 3 hours under a nitrogen gas stream while stirring. Then, it cooled to room temperature and added antioxidant. As a result, an acrylic copolymer (A) having a solid content concentration of 50% was obtained.

The numerical value added to each component in Table 1 is the blending amount (%), and the compound name of each component is as follows.
“2-EHA”: 2-ethylhexyl acrylate • “MA”: methyl acrylate • “AA”: acrylic acid • “2-HEA”: 2-hydroxyethyl acrylate • “Vac”: vinyl acetate.

<Examples 1 to 18 and Comparative Examples 1 to 8 (Preparation of adhesive tape)>
As shown in Table 2, with respect to 100 parts of the solid content of the acrylic copolymers (A) obtained in Production Examples 1 to 19, the crosslinking agent (B), the isocyanate crosslinking agent (B) and the tackifier resin (C) Were added and mixed to prepare an adhesive composition.

This pressure-sensitive adhesive composition was applied onto a silicone-treated release paper having a thickness of about 0.12 mm so that the thickness after drying was 0.08 mm. Next, the solvent was removed and dried at 110 ° C. for 2 minutes and a crosslinking reaction was performed. Thereafter, a pressure-sensitive adhesive layer was formed by performing a crosslinking reaction for 2 minutes with an infrared heater set so that the effective temperature of the infrared heater was 105 to 110 ° C. This pressure-sensitive adhesive layer was bonded to a multilayer substrate obtained by laminating a corona discharge-treated polyethylene film and a woven fabric. And it cured at 40 degreeC for 3 days, and obtained the adhesive tape.

<Example 18 (Preparation of adhesive tape)>
An adhesive tape was produced under the same conditions as in Example 5 except that a multilayer substrate formed by laminating a PET film and a nonwoven fabric was used as the substrate.
<Example 19 (Preparation of adhesive tape)>
An adhesive tape was produced under the same conditions as in Example 5 except that a multilayer substrate formed by laminating an aluminum foil and a nonwoven fabric was used as the substrate.

The numerical value added to each component in Table 2 is the blending amount (part), and the compound name of each component is as follows.
・ "Coronate L": Isocyanate-based crosslinking agent (product name: Coronate L, manufactured by Nippon Polyurethanes)
・ "Nikanol HP-100": Xylene-based tackifier resin (Mitsubishi Gas Chemical Co., Ltd., trade name Nikanol HP-100)
・ "Nikanol HP-150": Xylene-based tackifier resin (Mitsubishi Gas Chemical Company, trade name Nikanol HP-150)
"Pencel D-125, D-135": Rosin-based tackifying resin (trade name Pencel D-125, D-135, manufactured by Arakawa Chemical Co., Ltd.)
<Evaluation test>
The adhesive tapes obtained in each example and comparative example were evaluated by the following methods. The results are shown in Tables 3 and 4.

(Adhesion over time after application)
Aisen PET spunlace, one side of which was extruded with polyethylene resin, was bonded to 50 mm x 125 mm SUS304 with a size of 50 mm x 125 mm, and heat-bonded under pressure at 0.6 MPa for 2 minutes at 155 ° C. An adherend for evaluation was obtained.

A 20 mm × 125 mm adhesive tape was pressure-bonded to the adherend for evaluation with a 2 kgf roller in an atmosphere of 23 ° C. × 50%, and within 5 minutes, “5 ° C., 40 ° C., 100 ° C.”, “65 ° C. × 80” It was placed in a thermostatic layer set under each temperature atmosphere of “% RH” and left to stand after 168 hours. “Cycle test: 23 ° C. × 30 min · −40 ° C. × 90 min · 23 ° C. × 30 min · 70 ° C. × 95% Rh × 3h · 23 ° C. × 30 min · −40 ° C. × 90 min · 23 ° C. × 30 min · 90 ° C. × 240 min Was subjected to a thermal cycle test of 14 cycles, and was taken out after the end of the cycle. Then, using a tensile tester (Strograph V1C manufactured by Toyo Seiki Co., Ltd.) for 2 hours in an atmosphere of 23 ° C. × 50%, it was pulled in the 90 ° direction at a crosshead speed of 300 mm / min, and 90 ° peel adhesion was performed. The force (N / 20 mm) was measured.

(High temperature retention)
Using the same adherend 1 for evaluation as the post-sticking time-dependent adhesiveness test, a 20 mm × 70 mm adhesive tape was pressure-bonded with a 2 kgf roller in an atmosphere of 23 ° C. × 50%, and then the area shown in FIG. In the same way, attach a 50 gf weight 3 to the 20 mm x 20 mm part of the adhesive tape 2 within 1 minute, turn the test piece upside down so that the weight 3 hangs, and let it stand for 30 minutes in each temperature atmosphere. Measured and evaluated according to the following criteria.
-“◯”: The temperature that can be maintained is 90 ° C. or higher.
-"X": The temperature which can be hold | maintained is less than 90 degreeC.

(Low temperature sticking / retention)
Using the same adherend for evaluation as in the time-dependent adhesiveness test after the pasting, it was allowed to stand for 3 hours at −10 ° C., −5 ° C., and 0 ° C. in each temperature atmosphere. Using the harness and the evaluation adherend as shown in FIG. 2, press the 2 kgf roller so that the bonding area is 20 mm × 20 mm × 2 locations, and confirm whether it can be applied. It was hung as shown in FIG. 3 in each temperature atmosphere of -5 ° C., -5 ° C., and 0 ° C., and it was confirmed whether or not the harness could be held with tape, and evaluated according to the following criteria.
-“◯”: The harness can be attached with tape and the harness can be held at a low temperature.
・ "X": The harness cannot be attached with tape, or the harness cannot be held at a low temperature.

(Impact resistance)
Aisen PET spunlace, one side of which was extruded with polyethylene resin, was bonded to 200 mm x 200 mm SUS304 with a size of 200 mm x 200 mm, and pressure-heat bonded at 0.6 MPa for 2 minutes in an atmosphere of 155 ° C. An adherend for evaluation was obtained. The total weight of the adherend obtained is 320 g.

To this adherend for evaluation, an adhesive tape of 20 mm × 70 mm is pressure-bonded with a 2 kgf roller in an atmosphere of 23 ° C. × 50% so that the adhesive area is 20 mm × 20 mm × 2 as shown in FIG. A test sample having a total weight of the adherend and the harness of 400 g was obtained. Then, it was dropped from a height of 300 mm under an atmosphere of 23 ° C. × 50%, and the number of times that the adhesive tape was peeled off was evaluated. Two types of impact resistance tests were performed for each direction in which the adhesive tape and the harness are fixed (impact resistance tests A and B).

(PP adhesiveness)
Using the same adherend for evaluation as in the post-sticking adhesion test, a 20 mm × 70 mm adhesive tape was bonded to a polypropylene (PP) plate with a 2 kgf roller under a 23 ° C. × 50% atmosphere. Then, a weight of 100 gf was applied to a 20 mm × 20 mm portion within 1 minute, and the test piece was turned upside down so that the weight was hung, and the peeled off distance was measured in a 60 ° C. atmosphere for 30 minutes.

As is apparent from Tables 1 to 4, the adhesive tapes of Examples 1 to 19 have excellent load resistance, adhesion and impact resistance against rough surfaces over a wide temperature range, and olefins such as PP. It was also confirmed that it has excellent load resistance and adhesion.

On the other hand, in Comparative Example 1, since the Mw of the acrylic copolymer (No. 13) was too low, the high temperature retention and PP adhesiveness were inferior. In Comparative Example 2, since the Mw of the acrylic copolymer (No. 14) was too high, the high temperature retention and PP adhesiveness were inferior. In Comparative Example 3, since the proportion of the component (A4) in the acrylic copolymer (No. 15) is too high and the theoretical Tg is too high, the high temperature holding property, the low temperature sticking / holding property, and the PP adhesiveness are inferior. It was. Since the ratio of the component (A4) in an acrylic copolymer (No. 16) was too high, the comparative example 4 was inferior in high temperature retention and PP adhesiveness. In Comparative Example 5, since the proportion of the component (A4) in the acrylic copolymer (No. 17) is too high, adhesiveness after sticking, high temperature holding property, low temperature sticking / holding property, impact resistance, PP adhesion The sex was inferior. In Comparative Example 6, since the proportion of the component (A1) in the acrylic copolymer (No. 18) is too high, adhesiveness with time after application, high temperature retention, low temperature application / retention, impact resistance, PP adhesion The sex was inferior. In Comparative Example 7, the component (B) is not used, and the proportion of the component (A1) of the acrylic copolymer (No. 19) is too high. , PP adhesiveness was inferior. In Comparative Example 8, since the component (C) was not used, the adhesive property with time, the high temperature retention property, the impact resistance, and the PP adhesive property after application were inferior.

The pressure-sensitive adhesive tape using the pressure-sensitive adhesive composition of the present invention has excellent adhesion at any temperature from low to high temperatures, has excellent load resistance, and is excellent in rough surface adhesion and impact resistance. Therefore, it is useful in various fields where such characteristics are required. Specifically, for example, it is very useful as an adhesive tape used for fixing a wiring cable to a roof module of a vehicle such as an automobile.

1 Adherent 2 Adhesive tape 3 Weight 4 Harness

Claims

(Meth) acrylic acid alkyl ester (A1) having an alkyl group having 4 to 12 carbon atoms (A1) 50 to 90% by mass, (meth) acrylic acid alkyl ester (A2) 3 having an alkyl group having 1 to 3 carbon atoms Containing 10 to 10% by weight, 1 to 10% by weight of a carboxyl group-containing monomer (A3), and 0.5 to 2% by weight of a hydroxyl group-containing monomer (A4) as constituent components, a weight average molecular weight of 400,000 to 700,000, and a theoretical Tg An acrylic copolymer (A) having a hydroxyl group and a carboxyl group, wherein
A crosslinking agent (B);
A pressure-sensitive adhesive composition containing a tackifier resin (C).
The pressure-sensitive adhesive composition according to claim 1, wherein the total content of the carboxyl group-containing monomer (A3) and the hydroxyl group-containing monomer (A4) is 4.5% by mass or more.
The pressure-sensitive adhesive composition according to claim 1 or 2, wherein the acrylic copolymer (A) further contains vinyl acetate (A5) as a constituent component.
The pressure-sensitive adhesive composition according to any one of claims 1 to 3, wherein the crosslinking agent (B) comprises an isocyanate-based crosslinking agent.
The tackifier resin (C) contains at least one tackifier resin selected from a rosin tackifier resin and a xylene tackifier resin, and has a softening point of 70 to 150 ° C. The pressure-sensitive adhesive composition according to item.
A single-sided or double-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition according to any one of claims 1 to 5 on one side or both sides of a substrate.
The substrate is a multilayer substrate formed by laminating a plastic film and a nonwoven fabric, a multilayer substrate formed by laminating a plastic film and a woven fabric, or a multilayer substrate formed by laminating a metal foil and a nonwoven fabric. The single-sided or double-sided pressure-sensitive adhesive tape according to claim 6.
The single-sided or double-sided adhesive tape according to claim 6 or 7, which is used for fixing a wiring cable to a vehicle roof module.