JP2006282733A - Pressure-sensitive adhesive tape for temporarily fixing article and temporarily fixed article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure-sensitive adhesive tape for temporarily fixing an article which is hard to peel even when stress is caused in the state of being applied to a part to be attached of an article of an adherend, can easily be removed on peeling after achieving the object, and hardly causes adhesive transfer. <P>SOLUTION: In the pressure-sensitive adhesive tape for temporarily fixing an article having a pressure-sensitive adhesive layer on one surface of a base material, the base material is a polyester-based film, and the pressure sensitive adhesive layer is formed of an acrylic emulsion pressure-sensitive adhesive comprising an acrylic copolymer emulsion obtained from a monomer mixture having a 4-12C alkyl (meth)acrylate as the major component and containing a carboxy group-containing monomer, and an oxazoline group-containing aqueous crosslinking agent, and the pressure-sensitive adhesive tape has an undercoat layer formed of an oxazoline group-containing aqueous resin in between the base material and the pressure-sensitive adhesive layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an adhesive tape used for temporarily fixing an article. The present invention also relates to a temporarily fixed article in which the article is temporarily fixed by the adhesive tape. The pressure-sensitive adhesive tape of the present invention is used in a tape shape or a sheet shape.

  The adhesive tape for temporarily fixing and fixing the article of the present invention is, for example, when packing the article as an adherend when shipping the article such as an electrical appliance or an OA device, and the like, an internal part of the article, a door, etc. In order to temporarily fix and fix a portion to be adhered (for example, a printed steel plate or a resin plate), it is used by being attached to the portion to be adhered. For example, when the article is a refrigerator, the pressure-sensitive adhesive tape of the present invention is used for temporarily fixing a refrigerator door or the like.

  The properties required for adhesive tapes used for temporarily fixing and fixing articles such as electrical appliances and OA equipment include adhesives to securely fix the internal parts of the articles that are adherends and the parts to be attached such as doors. It is required that the tape does not peel even if stress is generated in a state where the tape is attached to the adherend portion. In addition, when the article is used, the adhesive tape that is no longer needed is finally peeled off from the adherend, and therefore the adhesive tape is required to be easily peeled off. Thus, the temporarily fixing adhesive tape is required to have contradictory characteristics.

  2. Description of the Related Art Conventionally, adhesive tapes for fixing temporarily are known in which an adhesive layer is formed on one side or both sides of a support. Since the temporarily fixing adhesive tape is required to be as inexpensive as possible, the same adhesive tape as that for cardboard box sealing is usually used (Patent Document 1). For example, a pressure-sensitive adhesive tape in which a pressure-sensitive adhesive layer is formed on one surface of a base material made of a general-purpose stretched polypropylene (OPP) film and a release agent layer is formed on the other surface has been generally used. In recent years, adhesive tapes based on polyethylene terephthalate (PET) film or longitudinally uniaxially stretched polypropylene film having higher substrate strength instead of OPP film have been used.

  On the other hand, organic solvent-type adhesives were used as adhesives used for temporarily fixing adhesive tapes. However, as with ordinary adhesives, social protection for environmental protection, resource conservation, health and safety, etc. Due to general demands and stricter regulations, water-based adhesives are being used as adhesives to replace organic solvent adhesives. As the water-based adhesive, an acrylic emulsion-type adhesive is usually used.

A pressure-sensitive adhesive layer formed by applying an acrylic emulsion-type pressure-sensitive adhesive has a high adhesive force with respect to a part to be adhered (for example, a printed steel plate or a resin plate) of an article such as a home appliance. However, the adhesive force between the base material and the pressure-sensitive adhesive layer formed from the acrylic emulsion-type pressure-sensitive adhesive is weak. For this reason, when the adhesive tape for temporarily fixing is peeled off from the adherend, the printed surface of the adherend portion is scraped off, or adhesive residue is generated on the adherend due to the interlaminar fracture of the adhesive layer. was there.
JP-A 63-86786

  The present invention is difficult to peel off even if stress occurs in the state of being attached to the adherend part of the article that is the adherend, and can be easily peeled off when the object is peeled after achieving the purpose, and An object of the present invention is to provide an adhesive tape for temporarily fixing and fixing an article, in which adhesive residue is hardly generated.

  Another object of the present invention is to provide a temporarily fixed article in which the article is temporarily fixed by the adhesive tape.

  As a result of intensive studies to solve the above problems, the present inventors have found that the above object can be achieved with the following adhesive tape, and have completed the present invention.

That is, the present invention has a pressure-sensitive adhesive layer on one side of a substrate, and an adhesive tape for temporarily fixing and fixing an article.
The base material is a polyester film,
From the monomer mixture in which the pressure-sensitive adhesive layer is mainly composed of an alkyl (meth) acrylate having an alkyl group having 4 to 12 carbon atoms and an alkyl group having 4 to 12 carbon atoms, and containing a carboxyl group-containing monomer. The acrylic copolymer emulsion obtained and an acrylic emulsion-type pressure-sensitive adhesive containing an oxazoline group-containing aqueous crosslinking agent,
The present invention relates to an adhesive tape for temporarily fixing an article characterized by having an undercoat layer formed of an aqueous resin containing an oxazoline group between a base material and an adhesive layer.

  The present invention also relates to a temporarily fixed article, characterized in that the article is temporarily fixed by the adhesive tape for temporarily fixing the article.

  The pressure-sensitive adhesive tape for temporary fixing of the present invention uses an acrylic emulsion-type pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer, and has a good adhesive force to the adherend (attached portion) of the article. Even if stress is generated with the adhesive tape applied, it is difficult to peel off and the article can be securely fixed temporarily.

  In the present invention, a polyester film having good mechanical strength is used as a base material, and an acrylic emulsion-type pressure-sensitive adhesive used for forming a pressure-sensitive adhesive layer uses an oxazoline group-containing water-based cross-linking agent as a cross-linking agent. In addition, an undercoat layer is provided between the base material and the pressure-sensitive adhesive layer with an aqueous resin containing an oxazoline group. Thus, in this invention, the adhesiveness of a base material and an adhesive layer is improved by selecting and using as a base material, the crosslinking agent of an adhesive layer, and the material of undercoat, respectively. Therefore, the adhesive tape for temporary fixing of the present invention can be easily peeled off from the adherend after achieving the purpose, making it difficult to scrape the printed surface of the adherend and to leave no adhesive residue. ing. Further, the pressure-sensitive adhesive layer of the temporary fixing tape of the present invention has not only good adhesion but also good cohesive strength (holding power). It is difficult to produce adhesive residue.

  As described above, the adhesive tape for temporary fixing of the present invention has an adhesive force that can securely fix the adhered portion of the article, and can be easily peeled off without adhesive residue. Can satisfy the contradictory properties of the releasability and releasability. In the domestic specification of household electrical appliances exemplified as an article to which the temporary fixing fixing adhesive tape is applied, the environmental temperature in the distribution stage is assumed to be in the range of -20 ° C to + 50 ° C. The fixing tape for fixing is preferably used in the above specifications.

  The adhesive tape for temporarily fixing and fixing the article of the present invention uses a polyester film as a base material. Specific examples of the polyester film include a polyethylene terephthalate film, a polybutylene terephthalate film, and a polynaphthylene terephthalate film. Among these, a polyethylene terephthalate film is preferable. A stretched film can be used as the polyester film. From the viewpoint of mechanical strength, it is preferable to use a polyester film having a thickness in the range of 30 to 50 μm because it can securely fix parts of home appliances and the like. In addition, it is easy to cut | disconnect with the polyester-type film of thickness less than 30 micrometers, and intensity | strength may be insufficient in order to temporarily fix the components of household appliances reliably. On the other hand, if the thickness exceeds 50 μm, the steel properties are high and difficult to handle, and the cost is not preferred.

  It is preferable to provide a corona discharge treatment on the surface of the polyester film. Moreover, printing etc. can be given to a polyester-type film as needed. In addition, on the side of the polyester film where the adhesive layer is not provided, a back treatment layer is provided with a long mirror alkyl type or silicone type back treatment agent in order to ensure releasability when the adhesive tape is wound. Can do.

  The acrylic emulsion-type pressure-sensitive adhesive forming the pressure-sensitive adhesive layer in the temporary fixing fixing pressure-sensitive adhesive tape of the present invention is mainly composed of an alkyl (meth) acrylate having an alkyl group having 4 to 12 carbon atoms and containing a carboxyl group. An acrylic copolymer emulsion obtained from a monomer mixture containing a body is contained. Alkyl (meth) acrylate means alkyl acrylate and / or alkyl methacrylate.

  Examples of the alkyl (meth) acrylate having 4 to 12 carbon atoms in the alkyl group include butyl (meth) acrylate, isobutyl (meth) acrylate, isoamyl (meth) acrylate, hexyl (meth) acrylate, hebutyl (meth) acrylate, 2- Examples include ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, and isononyl (meth) acrylate, and one or more of these are used.

  These alkyl (meth) acrylates having 4 to 12 carbon atoms in the alkyl group, as a main component of the monomer constituting the acrylic copolymer emulsion, account for about 50 to 99.9% by weight in all monomers. It is preferable to include. The ratio is preferably 80% by weight or more, more preferably 90% by weight or more, and further 93% by weight or more. When the proportion of the alkyl (meth) acrylate having 4 to 12 carbon atoms in the alkyl group is small, it is difficult to obtain a good adhesive pressure-sensitive adhesive.

  In addition to the alkyl (meth) acrylate having 4 to 12 carbon atoms in the alkyl group, the monomer constituting the copolymer emulsion can improve adhesion to the adherend, introduce a crosslinking point, For the purpose of increasing the cohesive strength of the pressure-sensitive adhesive, it contains a carboxyl group-containing monomer. The carboxyl group-containing monomer only needs to contain at least one carboxyl group in the molecule. Examples of the carboxyl group-containing monomer include acrylic acid, methacrylic acid, itaconic acid, maleic acid, and crotonic acid.

  The carboxyl group-containing monomer is used in a proportion of about 0.1 to 10% by weight, preferably 0.5 to 7% by weight, based on all monomers constituting the acrylic copolymer emulsion. If the carboxyl group-containing monomer is less than 0.1% by weight, the cohesive force is lowered and the adhesion to the substrate may be lowered. On the other hand, if it exceeds 10% by weight, the adhesiveness may be lowered. In addition, when using the alkyl (meth) acrylate and carboxyl group-containing monomer whose carbon number of an alkyl group is 4-12 as a monomer, it adjusts so that those total amounts may be 100 weight%.

  Moreover, you may use a monomer other than the above for an acrylic copolymer emulsion in the range which does not have trouble in the characteristic of this invention. These other monomers are preferably used in a proportion of 10% by weight or less in the total monomers constituting the acrylic copolymer emulsion.

  Examples of other monomers mentioned above include hydroxyl group-containing monomers such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 2-hydroxybutyl (meth) acrylate; (meth) acrylamide, N Amide group-containing monomers such as N, N-dimethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide; Amino group-containing monomers such as dimethylamino) ethyl (meth) acrylate; glycidyl group-containing monomers such as glycidyl (meth) acrylate; propyltrimethoxysilane (meth) acrylate, propyldimethoxysilane (meth) acrylate, propyltri Ethoxysilane (meth) acrelane Alkoxysilyl group-containing monomers such as; (meth) acrylonitrile, N- (meth) acryloyl morpholine, N- vinyl-2-pyrrolidone. In addition, alkyl (meth) acrylates having 1 to 3 carbon atoms of alkyl groups such as methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, etc .; tridecyl (meth) acrylate, stearyl (meth) acrylate, etc. Examples thereof include alkyl (meth) acrylates having 13 to 18 carbon atoms in the alkyl group, vinyl acetate, styrene, and vinyl toluene. Also, neopentyl glycol di (meth) acrylate, hexanediol di (meth) acrylate, propylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylolmethane tetra (meth) acrylate, dipentaerythritol hexa ( Examples thereof include those having two or more polymerizable functional groups such as (meth) acrylate. These monomers can be used alone or in combination of two or more.

  The acrylic copolymer emulsion is obtained by subjecting the monomer to emulsion polymerization by a conventional method using an appropriate polymerization initiator in the presence of an emulsifier. Emulsion polymerization is performed by general batch polymerization, continuous dropping polymerization, divided dropping polymerization, or the like.

  As the emulsifier, anionic emulsifiers and nonionic emulsifiers used in emulsion polymerization can be used without particular limitation. For example, anionic emulsifiers such as sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzene sulfonate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, etc. Nonionic emulsifiers and the like. In addition, cationic emulsifiers and amphoteric emulsifiers can be used. Although the usage-amount of an emulsifier is not restrict | limited in particular, It is preferable to set it as about 0.3-5 weight part with respect to 100 weight part of monomers (total).

  Examples of the polymerization initiator include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis (N, N′-dimethyleneisobutyl). Azo initiators such as amidine), persulfate initiators such as potassium persulfate and ammonium persulfate, peroxide initiators such as benzoyl peroxide and t-butyl hydroperoxide, and persulfates and sulfites. Examples thereof include redox initiators such as sodium hydrogen. In the emulsion polymerization, an appropriate chain transfer agent typified by mercaptans may be used as necessary to adjust the molecular weight of the resulting copolymer.

  The acrylic copolymer emulsion preferably has a weight average molecular weight of 1,000,000 or more, more preferably 1,000,000 to 2,000,000. When the weight average molecular weight is less than 1,000,000, the cohesive force of the acrylic emulsion-type pressure-sensitive adhesive tends to decrease, and the adhesion to the substrate tends to decrease. The weight average molecular weight is a value obtained by measuring tetrahydrofuran-soluble content by GPC (gel permeation chromatography).

  The acrylic emulsion-type pressure-sensitive adhesive of the present invention contains the above acrylic copolymer emulsion and an oxazoline group-containing aqueous crosslinking agent. The oxazoline group-containing aqueous crosslinking agent can be used without limitation as long as it has an oxazoline group in the molecule and is water-dispersible or water-soluble. For example, 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 2-isopropenyl-4- An aqueous crosslinking agent obtained by emulsion polymerization or the like using one or more addition polymerizable oxazolines such as methyl-2-oxazoline and 2-isopropenyl-5-ethyl-2-oxazoline is used. Specific examples include “Epocross WS-500” and “Epocross WS-700” manufactured by Nippon Shokubai Co., Ltd.

  The amount of the oxazoline group-containing aqueous crosslinking agent (solid content) is preferably about 0.01 to 10 parts by weight with respect to 100 parts by weight (solid content) of the acrylic copolymer emulsion. When the blending amount is less than 0.01 parts by weight, the oxazoline group as a crosslinking agent is reduced, so that the cohesive force is lowered and the adhesion to the substrate may be lowered. On the other hand, when the blending amount exceeds 10 parts by weight, the adhesive strength tends to decrease.

  Furthermore, various additives such as a softening agent, a plasticizer, a tackifier, an anti-aging agent, and a coloring agent can be used in the acrylic emulsion-type pressure-sensitive adhesive used in the present invention as long as the properties are not impaired. In addition, as a regulator of the reaction rate of the carboxyl group in the oxazoline group and the acrylic copolymer emulsion, a metal hydroxide compound such as sodium hydroxide that forms a salt with the carboxyl group, basic such as ammonia and alkylamine A compound can be blended.

  In addition, as for the water-based emulsion-type adhesive composition of this invention, it is desirable that glass transition temperature is -20--80 degreeC, and also -10-60 degreeC. The glass transition temperature is a value measured by DSC (differential thermal analysis).

  The temporarily fixing fixing pressure-sensitive adhesive tape of the article of the present invention has an undercoat layer formed of an aqueous resin containing an oxazoline group between the base material and the pressure-sensitive adhesive layer.

  The undercoat used for forming the undercoat layer is an aqueous resin containing an oxazoline group, which is a water-soluble polymer or an aqueous emulsion. As the water-based resin containing an oxazoline group, an acrylic resin is preferable. Specifically, an acrylic resin such as an acrylic resin containing an oxazoline group in a side chain, or a polystyrene-acrylonitrile copolymer containing an oxazoline group in a side chain. Resin, etc. In addition to the water-based resin containing an oxazoline group, additives and the like can be added to the undercoat as long as the object of the present invention is not impaired.

  Examples of commercially available aqueous resins containing an oxazoline group include, for example, “Epocross K-1000” series and “Epocross K-2000” series manufactured by Nippon Shokubai Co., Ltd., as an aqueous emulsion.

  The pressure-sensitive adhesive tape for temporarily fixing an article of the present invention is provided with a pressure-sensitive adhesive layer on the base material via an undercoat layer formed of the undercoat agent.

  The undercoat layer is usually formed by applying an undercoat agent to the substrate and drying it. The thickness of the undercoat layer (after drying) is usually about 0.001 to 3 μm, preferably 0.01 to 2 μm, and more preferably 0.03 to 2 μm. If it is the thickness of this range, the adhesiveness of a base material and an adhesive layer can fully be improved.

  The pressure-sensitive adhesive layer can be formed by directly applying and drying the above-mentioned acrylic emulsion-type pressure-sensitive adhesive on the surface of the undercoat layer. The pressure-sensitive adhesive layer can also be formed by transferring the pressure-sensitive adhesive layer formed on the separator onto a substrate having an undercoat layer. The thickness (after drying) of the pressure-sensitive adhesive layer is usually about 10 to 50 μm, preferably 20 to 40 μm.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples. Hereinafter, “parts” means “parts by weight”.

Example 1
(Base material)
A polyethylene terephthalate film having a thickness of 38 μm was used. The film has, on one surface, a solution obtained by dissolving a long-chain alkyl-based back-treating agent (manufactured by Yushi Co., Ltd., Pyroyl 1010) in a solvent (toluene) so that the dry thickness becomes 0.5 μm. It has a coated back treatment layer.

(Undercoat)
An oxazoline group-containing acrylic emulsion (manufactured by Nippon Shokubai Co., Ltd., Epocros K-2020E) was used.

(Adhesive)
For 100 parts of solid content of acrylic copolymer emulsion (DOW, DOW UCAR LATEX R-9801M), 2 parts of oxazoline group-containing water-soluble crosslinking agent (manufactured by Nippon Shokubai Co., Ltd., WS-700) (in terms of solid content) ) To prepare an acrylic emulsion-type pressure-sensitive adhesive.

  The acrylic copolymer emulsion was obtained by emulsion polymerization of 95 parts of n-butyl acrylate and 5 parts of acrylic acid in the presence of an anionic emulsifier, and the weight average molecular weight was 1,500,000. . The glass transition temperature of the acrylic emulsion-type pressure-sensitive adhesive was −45 ° C.

(Production of adhesive tape)
The undercoat was applied to one side of the substrate (the side not provided with the back treatment layer) so that the thickness after drying was 1 μm, and dried at 100 ° C. for 1 minute to form an undercoat layer. . Furthermore, on the undercoat layer, the acrylic emulsion-type pressure-sensitive adhesive is applied so that the thickness after drying becomes 30 μm, and dried at 120 ° C. for 3 minutes to form a pressure-sensitive adhesive layer. An adhesive tape was obtained.

Comparative Example 1
(Undercoat)
Chlorinated polyethylene (Eraslen 301A, Showa Denko KK) was used.

(Production of adhesive tape)
In Example 1, an undercoat layer was formed in the same manner as in Example 1 except that the above-described one was used as the undercoat agent. Moreover, the adhesive layer was formed like Example 1 with the acrylic emulsion type adhesive similar to Example 1, and the adhesive tape was obtained.

Comparative Example 2
(Undercoat)
A compound in which 2 parts of an isocyanate-based crosslinking agent (Nihon Polyurethane Industry Co., Ltd., Coronate L) was blended with 100 parts of methyl methacrylate-grafted natural rubber was used.

(Production of adhesive tape)
In Example 1, an undercoat layer was formed in the same manner as in Example 1 except that the above-described one was used as the undercoat agent. Moreover, the adhesive layer was formed like Example 1 with the acrylic emulsion type adhesive similar to Example 1, and the adhesive tape was obtained.

Comparative Example 3
(Undercoat)
A mixture of 85 parts of acrylonitrile-butadiene rubber and 15 parts of polyamide was used.

(Production of adhesive tape)
In Example 1, an undercoat layer was formed in the same manner as in Example 1 except that the above-described one was used as the undercoat agent. Moreover, the adhesive layer was formed like Example 1 with the acrylic emulsion type adhesive similar to Example 1, and the adhesive tape was obtained.

Comparative Example 4
(Adhesive)
For 100 parts of solid content of acrylic copolymer emulsion (DOW UCAR LATEX R-9801M, manufactured by DOW), 0.5 part (converted to solid content) of aziridine-based crosslinking agent (manufactured by Nippon Shokubai Co., Ltd., Chemite PZ-33) ) To prepare an acrylic emulsion-type pressure-sensitive adhesive.

(Production of adhesive tape)
In Example 1, an undercoat layer was formed in the same manner as in Example 1 using the same undercoat as in Example 1. Moreover, the adhesive layer was formed like Example 1 except having used the above-mentioned thing as an adhesive, and the adhesive tape was obtained.

Comparative Example 5
(Adhesive)
100 parts of a solid content of an acrylic copolymer emulsion (DOW, DOW UCAR LATEX R-9801M), 0.5 parts of an epoxy-based crosslinking agent (Mitsubishi Gas Chemical Co., Ltd., TETRAD-X) (in terms of solid content) ) To prepare an acrylic emulsion-type pressure-sensitive adhesive.

(Production of adhesive tape)
In Example 1, an undercoat layer was formed in the same manner as in Example 1 using the same undercoat as in Example 1. Moreover, except having used the above-mentioned thing as an adhesive, the adhesive layer was formed like Example 1 and the adhesive sheet was obtained.

Comparative Example 6
(Production of adhesive tape)
In Example 1, a pressure-sensitive adhesive layer was formed in the same manner as in Example 1 with the same acrylic emulsion type pressure-sensitive adhesive as in Example 1 directly on the base material without forming an undercoat layer with the undercoat. Thus, an adhesive tape was obtained.

Comparative Example 7
(Adhesive)
An acrylic copolymer emulsion (manufactured by DOW, DOW UCAR LATEX R-9801M) was used without blending a crosslinking agent.

(Production of adhesive tape)
In Example 1, an undercoat layer was formed in the same manner as in Example 1 using the same undercoat as in Example 1. Moreover, except having used the above-mentioned thing as an adhesive, the adhesive layer was formed like Example 1 and the adhesive sheet was obtained.

(Evaluation)
Using the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples, adhesive strength, shearing force, holding power, and adhesive residue on the adherend were measured and evaluated. Each measuring method and evaluation method are as follows. The evaluation results are shown in Table 1 together with the primer and adhesive components of the pressure-sensitive adhesive sheet. Note that the polycarbonate plate (PC plate) used for the evaluation has high adhesive strength to the adhesive sheet, and it is easy for adhesive residue to remain. Therefore, the polycarbonate plate (PC) is mainly used as an adherend exhibiting the superiority of the present invention, and its characteristics are compared. This evaluation does not limit the material to which the pressure-sensitive adhesive sheet of the present invention is applied.

〔Adhesive force〕
A 25 mm wide adhesive sheet was bonded to a stainless steel plate (SUS304BA) and a polycarbonate plate (PC) previously washed with toluene in a rubber roller at 23 ° C. × 60% RH, and left for 30 minutes. The resistance when the sample was peeled in a 180 ° direction at a peeling speed of 300 mm / min was measured as an adhesive strength (N / 25 mm) with a universal tensile tester (manufactured by Orietec, RTM-100). From the viewpoint of peelability, the adhesive strength is preferably 5 to 15 N / 25 mm, more preferably 5 to 10 N / 25 mm.

[Shearing force]
A 25 mm wide pressure-sensitive adhesive sheet was bonded to a stainless steel plate (SUS304BA) previously washed with toluene at 23 ° C. × 60% RH with a rubber roller so that the crimping area was 25 mm × 25 mm, and left for 30 minutes. Then, the resistance when the sample was peeled in the shear direction at a peeling speed of 300 mm / min was measured as a shearing force (N / 25 mm × 25 mm) with a universal tensile tester (manufactured by Orietec, RTM-100). . From the viewpoint of adhesion to the adherend under stress, the shearing force is preferably 100 to 400 N / 25 mm × 25 mm, more preferably 150 to 250 N / 25 mm × 25 mm.

[Retention force]
According to JIS Z-0237, the displacement distance (mm) after 60 minutes was measured under the conditions of a measurement temperature of 40 ° C. and a hanging load of 1 kg. From the viewpoint of adhesiveness to the adherend under stress, the holding force is preferably 0 to 1 mm, more preferably 0 to 0.3 mm.

[Adhesive residue on adherend]
Adhesive sheets are attached to polycarbonate plates (PC) and polystyrene plates (PS) as adherends, left at 60 ° C. for 120 hours, and then returned to room temperature (23 ° C.). Was peeled off, and whether the adhesive was peeled off from the adherend at the time of peeling was determined by visual observation based on the following criteria.
(Double-circle): The peeling residue of an adhesive is not recognized at all on a to-be-adhered body.
Δ: Peeling of the adhesive is slightly observed on the adherend.
X: The peeling-off residue of an adhesive is recognized by a to-be-adhered body.

表１中、Ａ：オキサゾリン基含有アクリル系エマルション（株式会社日本触媒製，エポクロスＫ−２０２０Ｅ）、Ｂ：塩素化ポリエチレン（昭和電工株式会社製，エラスレン３０１Ａ）、Ｃ：メチルメタクリレートグラフト化天然ゴムとシソシアネート系架橋剤の配合物、Ｄ：アクリロニトリル−ブタジエンゴムとポリアミドの混合物、である。

In Table 1, A: an oxazoline group-containing acrylic emulsion (manufactured by Nippon Shokubai Co., Ltd., Epocros K-2020E), B: chlorinated polyethylene (manufactured by Showa Denko Co., Ltd., Elastylene 301A), C: methyl methacrylate grafted natural rubber A blend of a isocyanate-based crosslinking agent, D: a mixture of acrylonitrile-butadiene rubber and polyamide.

Claims (2)

In the pressure-sensitive adhesive tape for temporarily fixing the article, having an adhesive layer on one side of the substrate,
The base material is a polyester film,
An acrylic copolymer emulsion obtained from a monomer mixture in which the pressure-sensitive adhesive layer contains an alkyl (meth) acrylate having an alkyl group having 4 to 12 carbon atoms as a main component and a carboxyl group-containing monomer; It is formed with an acrylic emulsion-type pressure-sensitive adhesive containing an oxazoline group-containing aqueous crosslinking agent,
A pressure-sensitive adhesive tape for temporarily fixing an article, comprising an undercoat layer formed of an aqueous resin containing an oxazoline group between the substrate and the pressure-sensitive adhesive layer.   A temporarily fixed article, wherein the article is temporarily fixed by the adhesive tape for temporarily fixing the article according to claim 1.