JP6791629B2 - Adhesive tape roll - Google Patents

Description

The present invention relates to an adhesive tape roll in which an adhesive tape provided with a polyvinyl chloride (PVC) film is wound in a roll shape.

Adhesive tapes (hereinafter also referred to as "PVC adhesive tapes") in which an adhesive layer is arranged on one surface of a PVC film as a supporting base material are widely used for various purposes such as electrical insulation, packaging, and protection. Has been done. Patent Documents 1 and 2 are examples of prior art documents relating to PVC adhesive tapes.

Japanese Unexamined Patent Publication No. 8-259909 JP-A-2009-249510

The PVC adhesive tape before use is typically prepared in the form of an adhesive tape roll wound in a roll with the surface of the pressure-sensitive adhesive layer abutting against the back surface of the PVC adhesive tape. Such a roll-type PVC adhesive tape is suitable for rewinding from the roll form (that is, pulling out the PVC adhesive tape from the roll) from the viewpoint of workability during use (for example, binding workability of electric wires and the like). It is desirable that it is configured so that a good resistance can be obtained.

By the way, as an example of the use of the PVC adhesive tape, there is an application of being wound around an electric wire in a wire harness assembled to a vehicle. If the weight of the PVC adhesive tape that can be used for the wire harness can be reduced in this way, it is significant because it can contribute to the improvement of the fuel efficiency of the vehicle through the weight reduction of the vehicle. In order to reduce the weight of the PVC adhesive tape, it is effective to thin the PVC film, which is a member made of PVC having a large specific gravity among plastics. However, when the PVC film constituting the PVC adhesive tape is thinned, the adhesive tape is stretched when the adhesive tape is rewound from the roll form and the width dimension becomes unstable, or the adhesive tape is torn during the rewinding. Inconveniences such as the above tend to occur, and the rewinding workability tends to decrease.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a PVC adhesive tape roll having good rewinding workability from a roll form.

According to the present invention, there is provided an adhesive tape roll in which a PVC adhesive tape containing a polyvinyl chloride film (PVC film) and an adhesive layer arranged on one surface of the PVC film is wound in the longitudinal direction. In the adhesive tape roll, the adhesive tape is wound with the surface (adhesive surface) of the adhesive layer in contact with the back surface (that is, the surface opposite to the adhesive surface) of the adhesive tape. Here, the 50% stretching force _FE50 of the adhesive tape is 25 N / 19 mm or less. The rewinding force _FUW [N / 19 mm] of the adhesive tape roll is 15 to 80% of the 50% stretching force _FE50 [N / 19 mm] of the adhesive tape. With this configuration, it is possible to obtain an adhesive tape roll having good rewinding workability.

The art disclosed herein, the unwinding force F _UW of the adhesive tape roll can be preferably carried out in a manner which is 5~10N / 19mm. The adhesive tape roll configured in this way is easy to use because the PVC adhesive tape is less likely to be torn or excessively deformed during rewinding and gives an appropriate resistance to rewinding.

In a preferred embodiment, the thickness of the pressure-sensitive adhesive layer can be, for example, 5 to 18 μm. The adhesive tape roll configured in this way has good rewinding workability and is suitable for reducing the weight of the PVC adhesive tape.

In the adhesive tape roll according to a preferred embodiment, the thickness of the PVC film is 100 μm or less. According to the technique disclosed herein, a PVC adhesive tape roll having good rewinding workability can be provided even in a configuration including such a thin PVC film.

The PVC film can contain an elastomer. In a configuration using a PVC film having such a composition, an adhesive tape roll satisfying the above-mentioned _FUW and _FUW / _FE50 can be preferably realized. Incorporating an elastomer in the PVC film can also be advantageous from the viewpoint of improving the low temperature characteristics of the PVC adhesive tape (for example, improving the flexibility at low temperatures). The content of the elastomer in the PVC film can be, for example, about 1 to 30% by weight. The increase in the content of the elastomer tends to improve the flexibility at low temperature and effectively prevent the event of tearing when the PVC adhesive tape is rewound from the roll form. On the other hand, if the content of the elastomer is too large, the PVC film may be softened too much, and the stability of the width dimension may decrease when the PVC adhesive tape is rewound from the roll form.

The PVC film typically contains a plasticizer. The technique disclosed herein can be preferably carried out in an embodiment in which the content of the plasticizer in the PVC film is, for example, about 10 to 60% by weight. According to the PVC film having such a composition, good rewinding workability, good low temperature characteristics and good heat resistance (for example, heat resistance deterioration) tend to be realized at the same time.

The PVC film constituting the PVC adhesive tape preferably contains a fatty acid metal salt. By including the fatty acid metal salt in the PVC film, the heat resistance deterioration tends to be improved. As the fatty acid metal salt, those containing at least one metal element (excluding Pb) belonging to any of Group 1, Group 2, Group 12, Group 13 and Group 14 of the periodic table can be preferably adopted. Among them, a fatty acid metal salt containing at least one metal element selected from the group consisting of Li, Na, Ca, Mg, Zn, Ba and Sn is preferable.

The technique disclosed herein can be preferably carried out in an embodiment in which the content of the fatty acid metal salt in the PVC film is, for example, about 0.02 to 1% by weight. According to a PVC film having such a composition, good low temperature characteristics and good heat resistance (typically heat resistance deterioration) tend to be realized at the same time.

Since the adhesive tape roll disclosed here is excellent in rewinding workability, the adhesive tape constituting the adhesive tape roll is attached to an adherend (for example, an electric wire constituting a wire harness) while rewinding the adhesive tape roll. It can be preferably used in a manner of wrapping around. Therefore, as another aspect of the present invention, one of the adhesive tape rolls disclosed herein is prepared, and the adhesive tape roll is wound around the electric wire constituting the wire harness while rewinding the adhesive tape roll. A method of manufacturing a wire harness that includes wrapping the constituent adhesive tape is provided. Further, as still another aspect of the present invention, there is a wire harness including an electric wire and an adhesive tape constituting any of the adhesive tape rolls disclosed herein, in which the adhesive tape is wound around the electric wire. Provided.

It is sectional drawing which shows typically the structure of the adhesive tape roll which concerns on one Embodiment.

Hereinafter, preferred embodiments of the present invention will be described. Matters other than those specifically mentioned in the present specification and necessary for the practice of the present invention shall be based on the teachings regarding the practice of the invention described in the present specification and the common general knowledge at the time of filing. Can be understood by those skilled in the art. The present invention can be carried out based on the contents disclosed in the present specification and common general technical knowledge in the art.

The adhesive tape roll disclosed herein has a structure in which a PVC adhesive tape is wound in the longitudinal direction. The PVC adhesive tape includes a PVC film and an adhesive layer arranged on one surface of the PVC film.

<PVC film>
The PVC film is typically obtained by forming a PVC composition containing a predetermined component into a film by a known method. Here, the PVC composition refers to a composition in which the main component (meaning the component contained most, which may be a component contained in an amount of more than 50% by weight) is PVC. According to such a PVC composition, a PVC film (typically, a film made of a soft PVC resin) exhibiting physical properties suitable as a base material (supporting base material) for supporting the pressure-sensitive adhesive layer can be formed. The content of PVC in the PVC film is typically more than 40% by weight, and it is usually appropriate to be 50% by weight or more. The technique disclosed herein can be preferably carried out in an embodiment in which the PVC content in the PVC film is more than 50% by weight (typically 55% by weight or more, for example 60% by weight or more).

(PVC)
The PVC constituting the PVC composition can be various polymers in which vinyl chloride is the main monomer (referring to the main component of the monomer component, which can be a monomer accounting for more than 50% by weight of the monomer component). That is, the concept of PVC here includes not only a homopolymer of vinyl chloride but also a copolymer of vinyl chloride and various comonomer. Examples of the comonomer include vinylidene chloride; olefins such as ethylene and propylene (preferably olefins having 2 to 4 carbon atoms); acrylic acid and methacrylic acid (hereinafter, acrylic and methacrylic are collectively referred to as "(meth) acrylic"). A carboxyl group-containing monomer such as maleic acid or fumaric acid or an acid anhydride thereof (maleic anhydride or the like); (meth) acrylic acid ester, for example, (meth) acrylic acid and an alkyl alcohol or cycloalkyl alcohol having about 1 to 10 carbon atoms. Esters with; Vinyl ester-based monomers such as vinyl acetate and vinyl propionate; Styrene-based monomers such as styrene, substituted styrene (α-methylstyrene, etc.), vinyl toluene; Acrylonitrile; and the like are exemplified. As the copolymer, it is preferable that the copolymerization ratio of vinyl chloride is 70% by weight or more (more preferably 90% by weight or more). PVC can be obtained by polymerizing such monomers by an appropriate method (typically a suspension polymerization method).

Although not particularly limited, the average degree of polymerization of PVC contained in the PVC composition can be, for example, about 600 to 1800. In consideration of the balance between processability (formability) and strength, PVC having an average degree of polymerization in the range of about 800 to 1600 (for example, about 900 to 1500) can be preferably adopted.

(Plasticizer)
PVC films in the techniques disclosed herein typically contain a plasticizer. As the plasticizer, various materials known to exhibit a plasticizing effect of PVC can be used without particular limitation. Examples of the above plasticizers include aromatic carboxylic acid esters such as benzoic acid ester (benzoic acid glycol ester, etc.), phthalic acid ester, terephthalic acid ester, trimellitic acid ester, pyromellitic acid ester; adipic acid ester, sebacic acid. Alibo carboxylic acid esters such as esters, azelaic acid esters, maleic acids esters, and citrate esters (tributyl acetyl citrate, etc.); polyesters of polyvalent carboxylic acids and polyhydric alcohols: other polyether polyesters, epoxy polyesters (Epoxidized vegetable oils such as epoxidized soybean oil and epoxidized flaxseed oil, epoxidized fatty acid alkyl esters, etc.), phosphate esters (tricrecil phosphate, etc.) and the like can be mentioned, but are not limited thereto. As the plasticizer, one type may be used alone or two or more types may be used in combination as appropriate.

As the phthalate ester (phthalate ester-based plasticizer), for example, a diester of phthalate and an alkyl alcohol having 4 to 16 carbon atoms (preferably 6 to 14, typically 8 to 13) can be used. Suitable examples thereof include di-n-octyl phthalate, di-2-ethylhexyl phthalate, diisononyl phthalate, and diisodecyl phthalate. Of these, diisononyl phthalate is preferable.

As the terephthalic acid ester (terephthalic acid ester-based plasticizer), for example, a diester of terephthalic acid and an alkyl alcohol having 4 to 16 carbon atoms (preferably 6 to 14, typically 8 to 13) can be used. As a preferred example, bis (2-ethylhexyl) terephthalate can be mentioned.

As the trimellitic acid ester (trimellitic acid ester-based plasticizer), for example, a trimellitic acid and an alkyl alcohol having 6 to 14 carbon atoms (typically 8 to 12) can be used. Preferable examples include trin-octyl trimellitic acid, tri-2-ethylhexyl trimellitic acid, triisononyl trimellitic acid, tri-n-decyl trimellitic acid, triisodecyl trimellitic acid and the like.

As the pyromellitic acid ester (pyromellitic acid ester-based plasticizer), for example, a tetraester of pyromellitic acid and an alkyl alcohol having 6 to 14 carbon atoms (typically 8 to 12) can be used. Preferable examples include tetra-n-octyl pyromellitic acid, tetra-2-ethylhexyl pyromellitic acid, tetra-n-decyl pyromellitic acid and the like.

As the adipic acid ester (adipate ester-based plasticizer), for example, a diester of adipic acid and an alkyl alcohol having 4 to 16 carbon atoms (preferably 6 to 14, typically 8 to 13) can be used. Suitable examples thereof include di-n-octyl adipate, di-2-ethylhexyl adipate, and diisononyl adipate.

Examples of the polyester (polyester-based plasticizer) include polyvalent carboxylic acids such as succinic acid, adipic acid, suberic acid, azelaic acid, sebacic acid, citric acid, phthalic acid, isophthalic acid, terephthalic acid, and trimellitic acid. , (Poly) ethylene glycol (here, "(poly) ethylene glycol" means to collectively refer to ethylene glycol and polyethylene glycol; the same shall apply hereinafter), (poly) propylene glycol, (poly) butylene glycol, Polyester compounds obtained from polyvalent alcohols such as (poly) hexanediol, (poly) neopentyl glycol, and polyvinyl alcohol can be used. As the polyvalent carboxylic acid, an aliphatic dicarboxylic acid having 4 to 12 carbon atoms (typically 6 to 10) is preferable, and preferred examples thereof include adipic acid and sebacic acid. In particular, adipic acid is desirable in terms of versatility and price. The polyhydric alcohol is preferably an aliphatic diol having 2 to 10 carbon atoms, and preferred examples thereof include ethylene glycol and butylene glycol (for example, 1,3-butanediol and 1,4-butanediol).

The content of the plasticizer in the PVC film is not particularly limited. The content of the plasticizer can be, for example, 10% by weight or more of the PVC film, and is preferably 15% by weight or more from the viewpoint of obtaining a better plasticizing effect. The content of the plasticizer may be 20% by weight or more. Further, the content of the plasticizer can be, for example, less than 50% by weight, and from the viewpoint of heat resistance (typically heat resistance deterioration), it is usually appropriate to be 40% by weight or less. It is preferably 35% by weight or less (for example, 30% by weight or less).

Although not particularly limited, the amount of the plasticizer used with respect to 100 parts by weight of PVC is usually preferably 15 to 75 parts by weight, preferably 20 to 60 parts by weight, and 30 to 50 parts by weight. Is more preferable.

(Elastomer)
In a preferred embodiment of the technique disclosed herein, the PVC film can contain an elastomer. By containing the elastomer in the PVC film, it is possible to improve the flexibility at a low temperature while suppressing the deterioration of characteristics such as strength at room temperature (for example, about 25 ° C.) and heat resistance (for example, heat resistance deterioration). Therefore, by using such a PVC film, a PVC adhesive tape roll having excellent low temperature characteristics (for example, crack prevention property at low temperature) can be realized in addition to rewinding workability. Incorporating an elastomer in a PVC film can also help improve the strength of the PVC film.

As the elastomer, various known polymer materials can be used. Non-limiting examples of such elastomers are chlorinated polyethylene (CPE), ethylene-vinyl acetate copolymers, vinyl chloride-vinyl acetate copolymers (eg, vinyl acetate content of approximately 10% by weight or more, typically. Approximately 10 to 25% by weight of vinyl chloride-vinyl acetate copolymer), (meth) acrylic acid ester-butadiene-styrene copolymer (for example, methyl methacrylate-butadiene-styrene copolymer), acrylonitrile -Butadiene-styrene copolymer, acrylonitrile-butadiene copolymer, styrene-butadiene copolymer (typically a styrene-butadiene block copolymer, for example, a styrene content of about 35% by weight or less, typically Approximately 10-35% by weight styrene-butadiene block copolymer), styrene-butadiene-styrene block copolymer, chlorosulfonated polyethylene (CSM), polyester-based thermoplastic elastomer, thermoplastic polyurethane, and other synthetic rubber ( Isoprene rubber, butadiene rubber, etc.), composites and modified products thereof, and the like. Elastomers may be used alone or in combination of two or more.

In the technique disclosed herein, it is preferable to select a material having good compatibility with PVC as the elastomer contained in the PVC film. Thereby, the low temperature characteristics of the PVC film and the PVC adhesive tape using the PVC film can be effectively improved. From the viewpoint of the appearance quality of the PVC adhesive tape, the elastomer is preferably used in a composition (content) within a range in which a good compatible state is realized in the PVC film. The compatible state can be grasped by observing the presence or absence of cloudiness, for example, in a state where the PVC film is stretched as it is or stretched (for example, stretched about twice in the flow direction).

As a non-limiting example of an elastomer that may be preferably used in the techniques disclosed herein, chlorinated polyethylene (eg, chlorine content is approximately 25-50% by weight, typically approximately 30-45% by weight, preferably. Approximately 35-45% by weight chlorinated polyethylene), (meth) acrylic acid ester-butadiene-styrene copolymer, acrylonitrile-butadiene copolymer (eg, acrylonitrile content of approximately 15-50% by weight, typically Is typically about 25-45% by weight, preferably about 30-40% by weight, an acrylonitrile-butadiene copolymer), an ethylene-vinyl acetate copolymer (eg, a vinyl acetate content of about 30-75% by weight, typically. (Ethylene-vinyl acetate copolymer, which is about 40 to 70% by weight, preferably about 50 to 65% by weight) and the like.

The content of the elastomer in the PVC film is not particularly limited and can be set so as to obtain a desired effect. Usually, it is appropriate that the content of the elastomer in the PVC film is about 0.5% by weight or more, and from the viewpoint of obtaining a higher effect, it is preferably about 1% by weight or more. Further, from the viewpoint of compatibility and the like described above, it is usually appropriate that the content of the elastomer in the PVC film is less than about 40% by weight, preferably about 35% by weight or less, and about 30% by weight or less (for example). Approximately 25% by weight or less) is more preferable. The techniques disclosed herein have an elastomer content of approximately 1 to 20% by weight (typically approximately 1 to 15) in a PVC film from the perspective of facilitating a balance between the effects of using the elastomer and other properties. It can be preferably carried out in an embodiment of (% by weight, preferably about 1 to 10% by weight, for example, about 3 to 8% by weight).

Although not particularly limited, the content of the elastomer with respect to 100 parts by weight of PVC is usually preferably about 1 part by weight or more, and preferably 2 parts by weight or more from the viewpoint of obtaining a higher effect. From the viewpoint of compatibility and the like, it is usually appropriate that the content of the elastomer with respect to 100 parts by weight of PVC is about 75 parts by weight or less, and about 55 parts by weight or less (typically about 50 parts by weight or less, For example, about 45 parts by weight or less) is preferable. In a preferred embodiment, the content of the elastomer with respect to 100 parts by weight of PVC can be approximately 2 to 25 parts by weight (eg, approximately 5 to 20 parts by weight).

(Fatty acid metal salt)
The PVC film in the technique disclosed herein preferably contains a fatty acid metal salt in addition to the PVC and the plasticizer. In the PVC film, the PVC contained in the PVC film receives heat, ultraviolet rays, physical energy such as shearing force, etc. during processing of the PVC film or the PVC adhesive tape or in the environment in which the adhesive tape is used. The color may be discolored due to a chemical reaction caused by the above, or the physical, mechanical or electrical properties may be impaired. By containing the fatty acid metal salt in the PVC film, the fatty acid metal salt can function as a stabilizer for preventing or suppressing the above chemical reaction. In addition, preventing or suppressing the above-mentioned chemical reaction (typically, desorption of hydrogen chloride) may contribute to the improvement of heat resistance deterioration of the PVC adhesive tape.

As the fatty acid metal salt, a compound that can function as a stabilizer for a PVC film can be used alone or in combination of two or more. For example, the fatty acid constituting the fatty acid metal salt is a saturated or unsaturated fatty acid (hydroxy fatty acid) having about 10 to 20 carbon atoms (typically 12 to 18), such as lauric acid, ricinoleic acid, and stearic acid. It can be preferably selected from.). From the viewpoint of moldability and processability of the PVC film, a metal stearic acid salt can be preferably used. Further, a metal lauric acid salt can be preferably used from the viewpoint of suppressing the change with time of the PVC film or the PVC adhesive tape and the flexibility at low temperature. A metal stearic acid salt and a metal lauric acid salt may be used in combination. In this case, the ratio of the amount of the metal lauric acid used to the amount of the metal stearate used is not particularly limited, but can be, for example, approximately 0.1 to 10 on a weight basis, and is usually approximately 0.2. It is appropriate to set it to ~ 5 (for example, about 0.5 to 2).

As the metal constituting the fatty acid metal salt, a metal other than lead (lead-free metal) is preferably used in consideration of the recent increase in awareness of environmental health. According to the technique disclosed herein, a PVC adhesive tape exhibiting good heat-resistant deterioration can be realized even in such an embodiment in which a stabilizer containing lead is not used. As the metal, for example, a metal element belonging to any of Group 1, Group 2, Group 12, Group 13 and Group 14 (excluding Pb) of the periodic table can be selected, and Li, as a preferred example. Examples thereof include Na, Ca, Mg, Zn, Ba and Sn. As the fatty acid metal salt, a Ca salt or a Ba salt can be preferably adopted from the viewpoint of cost, availability, and the like. Further, from the viewpoint of moldability, processability and the like of the PVC film, a Zn salt can be preferably adopted. In a preferred embodiment, the Ca salt and the Zn salt can be used in combination. In this case, the ratio of the amount of Zn salt used to the amount of Ca salt used is not particularly limited, but can be, for example, approximately 0.1 to 10 on a weight basis, and is usually approximately 0.2 to 5 (for example,). It is appropriate to set it to about 0.5 to 2). The technique disclosed herein can be preferably carried out, for example, in a mode containing Ca stearate and Zn laurate in the above weight ratio, or in a mode containing Zn stearate and Ca laurate in the above weight ratio. It is also possible to include the fatty acid Pb salt in the PVC film in applications where the use of the fatty acid Pb salt is permitted.

The amount of the fatty acid metal salt used is not particularly limited. The amount of the fatty acid metal salt used (the total amount of two or more kinds thereof when used) can be, for example, an amount such that the content of the fatty acid metal salt in the PVC film is approximately 0.01% by weight or more. From the viewpoint of obtaining a higher effect, it is preferably about 0.02% by weight or more, and more preferably about 0.05% by weight or more. The upper limit of the content of the fatty acid metal salt is not particularly limited, but it is usually appropriate to be about 5% by weight or less of the PVC film, and preferably about 3% by weight or less from the viewpoint of flexibility at low temperature and the like. , About 1% by weight or less (typically about 0.5% by weight or less, for example, about 0.3% by weight or less).

(Antioxidant)
The PVC film in the technique disclosed herein can contain an antioxidant in addition to the PVC and the plasticizer. By including an antioxidant in the PVC film, the heat resistance (typically, heat resistance deterioration) of the PVC adhesive tape can be improved.

As the antioxidant, a known material capable of exhibiting an antioxidant function can be used without particular limitation. Examples of antioxidants include phenol-based antioxidants, phosphorus-based antioxidants, sulfur-based antioxidants, amine-based antioxidants, and the like. The antioxidant may be used alone or in combination of two or more.

Preferred examples of the antioxidant include phenolic antioxidants such as hindered phenolic antioxidants. Examples of the hindered phenolic antioxidant include pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (trade name "Irganox1010", manufactured by Ciba Japan). , Octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate (trade name "Irganox1076", manufactured by Ciba Japan), 4,6-bis (dodecylthiomethyl) -o-cresol (Product name "Irganox 1726", manufactured by Ciba Japan), Triethylene glycol-bis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate] (Product name "Irganox 245", Ciba Japan) , Bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate (trade name "TINUVIN770", manufactured by Ciba Japan), dimethyl succinate and 4-hydroxy-2,2,6 Polycondensate with 6-tetramethyl-1-piperidin ethanol (dimethyl-1- (2-hydroxyethyl) succinate-4-hydroxy-2,2,6,6-tetramethylpiperidine polycondensate) (trade name) "TINUVIN622", manufactured by Ciba Japan Co., Ltd.) and the like. Among them, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (trade name "Irganox1010", manufactured by Ciba Japan), triethylene glycol-bis [3-( 3-tert-Butyl-5-methyl-4-hydroxyphenyl) propionate] (trade name "Irganox245", manufactured by Ciba Japan Co., Ltd.) and the like are preferable.

The amount of the antioxidant used (the total amount thereof when two or more kinds are used) is not particularly limited, and for example, the content of the antioxidant in the PVC film is approximately 0.001% by weight or more. can do. From the viewpoint of obtaining a higher effect, it is usually appropriate that the content of the antioxidant in the PVC film is about 0.005% by weight or more, preferably about 0.01% by weight or more, and about about 0.01% by weight. More preferably, it is 0.05% by weight or more. In a preferred embodiment, the content of the antioxidant in the PVC film can be about 0.1% by weight or more, may be about 0.5% by weight or more, and even more than about 1% by weight (for example, about 1% by weight). It may be 5.5% by weight or more). The upper limit of the content of the antioxidant is not particularly limited, but it is usually appropriate to set it to about 5% by weight or less (typically about 3% by weight or less) of the PVC film.

The PVC film in the technique disclosed herein includes, if necessary, a known additive that can be used for a PVC film (particularly, a PVC film for a PVC adhesive tape), as long as the effects of the present invention are not significantly impaired. Can be contained. Examples of such additives include colorants such as pigments and dyes, stabilizers other than fatty acid metal salts (eg, organotin compounds such as dioctyltin laurate), stabilizing aids (eg, trialkylphosphite, etc.). Phosphite, inorganic compounds such as hydrotalcite and zeolite), light stabilizers, ultraviolet absorbers, modifiers, flame retardants, antistatic agents, fungicides, lubricants and the like. The amount of these additives used can be a general amount in the field of PVC film. The PVC film in the technique disclosed herein preferably does not contain a compound having a plurality of polymerizable functional groups (for example, (meth) acryloyl group) in the molecule, such as trimethylolpropane and the like. This is because the compound having a plurality of polymerizable functional groups may polymerize by oxidation or the like to exert an action of curing the PVC film, which may impair the low temperature characteristics.

A PVC film having such a composition is typically obtained by molding a PVC composition having a corresponding composition into a film shape by a method known in the field of thermoplastic resin films. As such a known molding method, for example, a melt extrusion molding method (inflation method, T-die method, etc.), a melt salivation method, a calendar method, or the like can be used. The technique disclosed herein is also preferable in an embodiment in which the PVC film is not subjected to a treatment such as addition of a cross-linking agent or irradiation with active energy rays to intentionally enhance the cross-linking property of the entire PVC film. Can be carried out. According to such a PVC film, there is a tendency to obtain a PVC adhesive tape having better low temperature characteristics. The degree of cross-linking of the PVC film can be grasped by putting 1 g of the PVC film into 10 mL of tetrahydrofuran (THF), stirring the film, and visually observing how the PVC film dissolves in THF. At this time, THF. It can be determined that the PVC film in which the insoluble matter remains is intentionally introduced with a crosslinked structure.

As an example, the outline of a typical film making procedure when using the calendar method is shown below.
(1) Weighing: PVC, plasticizer and other materials used as needed are weighed according to the target composition.
(2) Mixing: Each of the weighed materials is stirred and mixed to prepare a uniform mixture (typically a powdery mixture, that is, a mixed powder).
(3) Kneading: The mixture prepared in (2) above is heated to melt and kneaded with two or three or more kneading rolls (typically metal rolls). It is appropriate to set the temperature of the kneading roll to, for example, 100 ° C. to 250 ° C. (preferably 150 ° C. to 200 ° C.).
(4) Calendar molding: The kneaded product obtained in (3) above is put into a calendar molding machine to mold a PVC film having an arbitrary thickness. The thickness can be controlled by adjusting the gap between the calendar rolls and / or the speed ratio between the rolls. The speed ratio between the rolls can be adjusted preferably in the range of 1.0 to 1.5, more preferably 1.1 to 1.4, for example 1.2 to 1.3.

The dynamic viscosity of the PVC composition (that is, the resin material constituting the PVC film) is not particularly limited. From the viewpoint of ease of production of a thin (for example, less than 100 μm thick, typically 80 μm or less) PVC film, the dynamic viscosity of the PVC composition is usually about 4000 Pa · s or less (for example, about 3500 Pa · s). -It is advantageous that it is s or less). In a preferred correspondence, the dynamic viscosity of the PVC composition can be about 3000 Pa · s or less (more preferably about 2800 Pa · s or less, for example about 2500 Pa · s or less). According to the PVC film formed from the PVC composition exhibiting such a dynamic viscosity, a PVC adhesive tape having a large tensile elongation at break at −20 ° C. can be preferably realized. The dynamic viscosity of the PVC composition can be, for example, about 1000 Pa · s or more, and from the viewpoint of the strength of the PVC film, it is usually about 1300 Pa · s or more (for example, about 1500 Pa · s or more). ..

Here, the dynamic viscosity of the PVC composition means a value measured according to the flow test method described in JIS K 7210 (2009). Specifically, a flow tester (capillary rheometer) CFT-500D / 100D manufactured by Shimadzu Corporation was used, and a PVC film as a measurement sample was filled and melted in a piston having a capacity of 1 cm ³ set at 160 ° C. The dynamic viscosity (unit: Pa · s) obtained from the flow rate (Q) when extruded from a die having a hole diameter (D) of 1 mm and a length (L) of 1 mm under a load (P) of 40 MPa is obtained here. It can be adopted as a dynamic viscosity in the technology disclosed in.
The dynamic viscosity can be adjusted by selecting the components contained in the PVC composition (PVC and plasticizers, elastomers and other additives used as necessary) and their blending ratios. For example, use PVC with a lower average degree of polymerization, use an elastomer with a lower melt flow rate (MFR), select an elastomer that is more compatible with PVC, and use more plasticizer. The dynamic viscosity of the PVC composition generally tends to decrease by applying one or more, such as increasing the number.

In the adhesive tape disclosed herein, the PVC film may constitute a single-layer or multi-layer support base material made of the PVC film, and a support base material including another layer in addition to the PVC film is used. It may be configured. In a preferred embodiment, the other layer may be an auxiliary layer such as a printing layer, a peeling treatment layer, a primer layer or the like provided on the surface of the PVC film. Alternatively, the PVC film may constitute a supporting base material having a structure in which the PVC film is laminated with a resin film other than the PVC film. As a preferred embodiment, there is a configuration in which the pressure-sensitive adhesive layer is arranged on one side of a support base material made of a single-layer PVC film.

In the technique disclosed herein, the thickness of the supporting base material is not particularly limited, and any thickness may be used as long as the 50% stretching force _{FE50 of} the PVC adhesive tape can be 25 N / 19 mm or less. The thickness of the supporting base material (for example, the supporting base material made of a single-layer PVC film) can be, for example, about 200 μm or less, and usually about 150 μm or less (for example, about 120 μm or less) is suitable. The significance of applying the techniques disclosed herein tends to be better exhibited in PVC adhesive tape rolls using a thin PVC film as a supporting base material. For example, as the supporting base material, a PVC film having a thickness of about 100 μm or less (typically less than about 100 μm, more preferably about 90 μm or less, still more preferably about 80 μm or less) can be preferably adopted. The supporting base material may be a PVC film having a thickness of about 75 μm or less. The thickness of the supporting base material is typically about 10 μm or more, usually about 25 μm or more, and is preferably about 50 μm or more (for example, about 60 μm or more) from the viewpoint of handleability and crack prevention at low temperature. The thickness of the supporting base material is, for example, protection and bundling of electric wires and pipes, coating of a corrugated tube that surrounds and protects the electric wires and the like, coating of a bundle of a plurality of electric wires (focused electric wires), and electrical insulation. , Etc. can be preferably applied to the adhesive tape used for.

Corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, undercoating agent (primer) application, antistatic treatment, etc., as necessary, on the surface of the supporting base material on which the pressure-sensitive adhesive layer is arranged. The conventionally known surface treatment may be applied. Such a surface treatment may be a treatment for improving the adhesion between the base material and the pressure-sensitive adhesive layer, in other words, the anchoring property of the pressure-sensitive adhesive layer on the base material. The composition of the primer is not particularly limited and can be appropriately selected from known ones. The thickness of the undercoat layer is not particularly limited, but is usually preferably about 0.01 μm or more and about 1 μm or less, and more preferably about 0.1 μm or more and about 1 μm or less.

In a PVC adhesive tape having a structure in which an adhesive layer is arranged only on one surface of a supporting base material, improvement in printability, reduction in light reflectivity, and stacking are performed on the surface (back surface) on the side where the adhesive layer is not arranged. For the purpose of improving the adhesiveness, the back surface may be subjected to treatments such as corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, and alkali treatment.
If necessary, the back surface of the PVC adhesive tape may be subjected to a conventionally known surface treatment such as a peeling treatment or an antistatic treatment. For example, by providing a peeling treatment layer such as a long-chain alkyl type or a silicone type on the back surface of the base material, the unwinding force of the adhesive tape roll can be reduced. The adhesive tape roll disclosed herein can be preferably implemented even in a form in which the back surface of the PVC adhesive tape is not subjected to the peeling treatment as described above.

<Adhesive layer>
The pressure-sensitive adhesive layer in the technique disclosed herein is typically a material that exhibits a soft solid (viscoelastic body) state in a temperature range near room temperature and has the property of easily adhering to an adherend by pressure ( It is a layer composed of an adhesive). The adhesive referred to here is generally a complex tensile modulus E ^* (1 Hz) as defined in "CA Dahlquist," Adhesion: Fundamental and Practice ", McLaren & Sons, (1966) P. 143". <(typically materials having the properties in 25 ° C.) material having a property that meets the ¹⁰ 7 dyne / cm ² is.

The pressure-sensitive adhesive layer in the technique disclosed herein includes an aqueous dispersion type pressure-sensitive adhesive composition, a water-soluble pressure-sensitive adhesive composition, a solvent-type pressure-sensitive adhesive composition, a hot-melt type pressure-sensitive adhesive composition, and an active energy ray-curable pressure-sensitive adhesive composition. It can be a pressure-sensitive adhesive layer formed from various forms of pressure-sensitive adhesive compositions such as substances. Here, the "active energy ray" refers to an energy ray having energy that can cause a chemical reaction such as a polymerization reaction, a cross-linking reaction, or decomposition of an initiator, and is an ultraviolet ray, a visible ray, an infrared ray, or an α ray. , Β-ray, γ-ray, electron-ray, neutron-ray, X-ray and other radiation. A pressure-sensitive adhesive layer formed from a water-dispersible pressure-sensitive adhesive composition is preferable because it is easy to suppress the transfer of the plasticizer in the PVC film to the pressure-sensitive adhesive layer and suppress the change in adhesive strength with time.

The type of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited. The pressure-sensitive adhesive includes various rubber-like polymers such as rubber-based polymers, acrylic polymers, polyester-based polymers, urethane-based polymers, polyether-based polymers, silicone-based polymers, polyamide-based polymers, and fluorine-based polymers, which are known in the field of pressure-sensitive adhesives. It may contain one or more of the above as a base polymer (main component among polymer components). Here, the rubber-based pressure-sensitive adhesive refers to a pressure-sensitive adhesive containing a rubber-based polymer as a base polymer. The same applies to acrylic adhesives and other adhesives. Further, the acrylic polymer refers to a polymer containing a monomer unit derived from a monomer having at least one (meth) acryloyl group in one molecule (acrylic monomer) in the polymer structure, and is typically acrylic. A polymer containing a monomer unit derived from a monomer in a proportion of more than 50% by weight. The (meth) acryloyl group has the meaning of comprehensively referring to an acryloyl group and a methacryloyl group.

As the pressure-sensitive adhesive layer of the PVC adhesive tape disclosed herein, a pressure-sensitive adhesive layer (rubber-based pressure-sensitive adhesive layer) containing a rubber-based pressure-sensitive adhesive as a main component is used from the viewpoint of low-temperature characteristics and wide object selectivity. It can be preferably adopted. The rubber-based pressure-sensitive adhesive may contain one or more rubber-based polymers selected from natural rubber and synthetic rubber. In addition, in this specification, a "principal component" means a component contained most in particular, and typically means a component contained in excess of 50% by weight. As the rubber-based polymer, both natural rubber and synthetic rubber can be used. As the natural rubber, known materials that can be used in the pressure-sensitive adhesive composition can be used without particular limitation. The term "natural rubber" as used herein is not limited to unmodified natural rubber, but is a concept that includes modified natural rubber modified with, for example, an acrylic acid ester. Unmodified natural rubber and modified natural rubber may be used in combination. As the synthetic rubber, known materials that can be used in the pressure-sensitive adhesive composition can be used without particular limitation. Preferable examples include styrene-butadiene rubber (SBR), styrene-isoprene rubber, chloroprene rubber and the like. These synthetic rubbers may be unmodified or modified (eg, carboxy-modified). The rubber-based polymer may be used alone or in combination of two or more.

The PVC pressure-sensitive adhesive tape according to a preferred embodiment has a rubber-based pressure-sensitive adhesive layer formed from a water-dispersible rubber-based pressure-sensitive adhesive composition obtained by blending a rubber-based latex with a pressure-imparting resin or other additives as needed. .. The rubber-based latex may be one in which various known rubber-based polymers are dispersed in water. Both natural rubber latex and synthetic rubber latex can be used. As the natural rubber latex, known materials that can be used in the pressure-sensitive adhesive composition can be used without particular limitation. The natural rubber latex referred to here is not limited to the unmodified natural rubber latex, but is a concept including a modified natural rubber latex modified with, for example, an acrylic acid ester. The unmodified natural rubber latex and the modified natural rubber latex may be used in combination. As the synthetic rubber latex, known materials that can be used in the pressure-sensitive adhesive composition can be used without particular limitation. Preferable examples include styrene-butadiene rubber latex (SBR latex), styrene-isoprene rubber latex, chloroprene rubber latex and the like. The synthetic rubber contained in these synthetic rubber latex may be unmodified or modified (for example, carboxy-modified). The rubber-based latex may be used alone or in combination of two or more.

The rubber-based pressure-sensitive adhesive composition according to a preferred embodiment (for example, a water-dispersible rubber-based pressure-sensitive adhesive composition) contains both natural rubber and synthetic rubber as the rubber-based polymer. According to such an adhesive composition, a PVC adhesive tape exhibiting good adhesive properties can be formed. For example, a PVC adhesive tape exhibiting adhesive properties suitable for applications such as protection and bundling of electric wires and pipes, coating of corrugated tubes as described above, electrical insulation, and the like can be formed. The weight ratio of natural rubber to synthetic rubber (natural rubber: synthetic rubber) is preferably in the range of about 10:90 to 90:10, more preferably in the range of about 20:80 to 80:20, and about 30:70. The range of ~ 70:30 is more preferable. SBR can be preferably used as the synthetic rubber.

The pressure-sensitive adhesive layer (typically a rubber-based pressure-sensitive adhesive layer) in the technique disclosed herein may contain a tack-imparting resin in addition to the base polymer as described above. As the tackifier resin, an appropriate one can be selected and used from various known tackifier resins. For example, one or more selected from various tackifier resins such as rosin resin, petroleum resin, terpene resin, phenol resin, Kumaron inden resin, and ketone resin can be used.

Examples of rosin-based resins include rosin derivatives such as disproportionate rosin, hydrogenated rosin, polymerized rosin, maleated rosin, and fumarized rosin, and phenol-modified rosin and rosin ester. Examples of the phenol-modified rosin include those obtained by adding phenols to a natural rosin or a rosin derivative, and a phenol-modified rosin obtained by reacting a resole-type phenol resin with a natural rosin or a rosin derivative. Be done. Examples of the rosin ester include an esterified product obtained by reacting the rosin resin with a polyhydric alcohol. The rosin phenol resin can also be an esterified product.

Examples of terpene-based resins include terpene resins (α-pinene resin, β-pinene resin, limonene resin, etc.), terpene phenol resins, aromatic-modified terpene resins, hydride terpene resins, and the like.

Examples of petroleum resins include aliphatic (C5 series) petroleum resins, aromatic (C9 series) petroleum resins, aliphatic / aromatic copolymer (C5 / C9 series) petroleum resins, and hydrogenated additives thereof ( For example, an aliphatic petroleum resin obtained by hydrogenating an aromatic petroleum resin), various modified products thereof (for example, a maleic anhydride modified product) and the like can be mentioned.

Examples of phenolic resins include condensates of formaldehyde with various phenols such as phenol, m-cresol, 3,5-xylenol, p-alkylphenol, and resorcin. Other examples of the phenolic resin include resol obtained by addition-reacting the above-mentioned phenols and formaldehyde under an alkali catalyst, and novolak obtained by subjecting the above-mentioned phenols and formaldehyde to a condensation reaction under an acid catalyst. Be done.

Examples of the kumaron inden resin include kumaron inden resin, hydrogenated kumaron inden resin, phenol-modified kumaron inden resin, epoxy-modified kumaron inden resin and the like.

Examples of the ketone resin include ketone resins produced by condensation of ketones (for example, aliphatic ketones such as methyl ethyl ketone, methyl isobutyl ketone and acetophenone, and alicyclic ketones such as cyclohexanone and methylcyclohexanone) and formaldehyde.

The softening temperature of the tackifier resin used is not particularly limited. For example, a tackifier resin having a softening point of 60 to 160 ° C. can be used. Further, a tackifier resin that is liquid at room temperature may be used. From the viewpoint of achieving a good balance between cohesive force and low temperature characteristics (for example, rewinding property and adhesive force at low temperature), a tackifier resin having a softening point of about 60 to 140 ° C. (more preferably about 80 to 120 ° C.) is used. It can be preferably used. For example, it is preferable to use a petroleum-based resin having a softening point in the above range. The softening point of the tackifier resin can be measured based on the softening point test method (ring ball method) specified in JIS K2207.

The ratio of the polymer component contained in the pressure-sensitive adhesive layer to the pressure-sensitive adhesive resin is not particularly limited, and can be appropriately determined depending on the intended use. The content of the tackifier resin with respect to 100 parts by weight of the polymer component can be, for example, about 20 parts by weight or more, and usually about 50 parts by weight or more, based on the non-volatile content. From the viewpoint of obtaining a higher effect of use, the amount of the tackifier resin used with respect to 100 parts by weight of the polymer component can be about 80 parts by weight or more, and may be about 100 parts by weight or more. On the other hand, from the viewpoint of low temperature characteristics and the like, it is usually appropriate that the amount of the tackifier resin used with respect to 100 parts by weight of the polymer component is about 200 parts by weight or less, and preferably about 150 parts by weight or less.

In addition, the pressure-sensitive adhesive layer includes viscosity modifiers (thickening agents, etc.), leveling agents, plasticizers, softeners, fillers, colorants such as pigments and dyes, light stabilizers, antiaging agents, and antioxidants. , Water resistant agent, antistatic agent, foaming agent, defoaming agent, surfactant, preservative, cross-linking agent, etc., various additives common in the field of adhesives may be contained as required. ..

The pressure-sensitive adhesive layer can be formed by appropriately adopting various conventionally known methods. For example, a method (direct method) is adopted in which the pressure-sensitive adhesive composition is directly applied (typically applied) to the above-mentioned base material (typically a PVC film) and dried to form a pressure-sensitive adhesive layer. can do. Further, a method (transfer method) in which a pressure-sensitive adhesive composition is applied to a peelable surface (peeling surface) and dried to form a pressure-sensitive adhesive layer on the surface, and the pressure-sensitive adhesive layer is transferred to a substrate (transfer method). May be adopted. You may combine these methods. As the peeling surface, the surface of the peeling liner, the back surface of the support base material that has been peeled off, or the like can be used.

The pressure-sensitive adhesive composition can be applied using a known or conventional coater such as a gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, or a spray coater. The pressure-sensitive adhesive layer is typically formed continuously, but may be formed in a regular or random pattern such as punctate or striped depending on the purpose and application.

In the technique disclosed herein, the thickness of the pressure-sensitive adhesive layer is not particularly limited. The thickness of the pressure-sensitive adhesive layer can be appropriately set so that, for example, _FUW / _FE50 disclosed herein can be in an appropriate range. In one aspect, the thickness of the pressure-sensitive adhesive layer can be about 30 μm or less, usually preferably 25 μm or less, and about 20 μm or less (typically less than about 20 μm, for example, about 18 μm or less). Is more preferable. Further, from the viewpoint of obtaining an appropriate adhesive force, it is usually appropriate that the thickness of the pressure-sensitive adhesive layer is about 3 μm or more, and it is preferable that the thickness is about 5 μm or more (for example, about 7 μm or more).

The technique disclosed herein can be preferably carried out in the form of an adhesive tape roll in which the thickness of the pressure-sensitive adhesive layer is approximately 5 μm or more and less than 20 μm (typically approximately 7 to 18 μm, more preferably approximately 10 to 15 μm). .. The range of the thickness of the pressure-sensitive adhesive layer can be preferably applied to, for example, a pressure-sensitive adhesive tape roll used for protection and bundling of electric wires, pipes, etc., coating of corrugated tubes as described above, electrical insulation, and the like. In particular, for an adhesive tape roll in which the thickness of the supporting base material is less than about 100 μm (for example, less than about 90 μm), it is advantageous to set the thickness of the adhesive layer within the above range from the viewpoint of adjusting the rewinding force and the like. Is.

<Adhesive tape roll>
An example of the configuration of the adhesive tape roll disclosed herein is shown in FIG. The adhesive tape roll 100 shown in FIG. 1 has a supporting base material (for example, a single-layer PVC film) 11 having a first surface 11A and a second surface 11B, and an adhesive layer 21 arranged on the first surface 11A. The PVC adhesive tape 1 comprising the above has a structure in which the PVC adhesive tape 1 is wound in the longitudinal direction. In the adhesive tape roll 100, the surface (adhesive surface) 21A of the adhesive tape 1 is protected by the adhesive layer 21 coming into contact with the second surface 11B of the supporting base material.

The adhesive tape (PVC adhesive tape) constituting the adhesive tape roll disclosed herein typically has a 50% draw force _FE50 measured by the method described in Examples described later, which is 25 N / 19 mm or less. .. The PVC adhesive tape exhibiting such a 50% stretching force _FE50 has high flexibility even in a configuration using a thin (for example, 100 μm or less, further 80 μm or less) PVC film, and causes cracks at low temperature characteristics (cracking at low temperature). Difficult performance) tends to be good. From this viewpoint, the technology disclosed herein, the 50% stretching force F _E50 of the adhesive tape can be preferably carried out in a manner which is 24N / 19 mm or less (e.g. 22N / 19 mm or less). The lower limit of the 50% stretching force _FE50 is not particularly limited, and may be, for example, 5N / 19 mm or more. From the viewpoint of handleability of the adhesive tape (for example, rewinding workability from the adhesive tape roll), it is usually appropriate to set the 50% stretching force _FE50 to 10 N / 19 mm or more, and set it to 12 N / 19 mm or more. It is preferably more than 13N / 19mm (for example, 15N / 19mm or more). The 50% stretching force _FE50 of the adhesive tape can be adjusted, for example, by appropriately setting the thickness and composition of the supporting base material (typically PVC film) constituting the adhesive tape.

Adhesive tape roll disclosed herein, typically, unwind force F _UW which is measured by the method described in Examples below [N / 19 mm] is 50% stretching force of the adhesive tape F _E50 [ N / 19 mm] is 15 to 80%. That is, the value of _FUW / _{FE50 is in} the range of 15% to 80%. By setting _FUW / _FE50 in the above range, good rewinding workability is realized even in an adhesive tape roll on which a highly flexible adhesive tape having a 50% stretching force _FE50 of 25 N / 19 mm or less is wound. Can be done. Improving the rewinding workability can contribute advantageously in terms of, for example, automation of winding work, speeding up, and improvement of winding accuracy. From the viewpoint of obtaining higher winding workability, the _FUW / F _E50 of the adhesive tape roll can be set to 60% or less (preferably 50% or less, more preferably 40% or less). The lower limit of _FUW / F _E50 is not particularly limited, but is usually preferably 18% or more, preferably 20% or more, and more preferably 25% or more.

The rewinding force of the adhesive tape roll disclosed herein is not particularly limited, and the value of _FUW / _FE50 can be set to be 15% to 80%. From the viewpoint of reducing the workload required for rewinding, it is usually appropriate to set the rewinding force to 18 N / 19 mm or less. By setting the rewinding force to 15 N / 19 mm or less (preferably 13 N / 19 mm or less, more preferably 12 N / 19 mm or less), good rewinding workability (for example, improvement of automation suitability, improvement of high-speed rewind suitability, etc.) ) Tends to be realized easily. Further, by setting the rewinding force to 2N / 19mm or more (preferably 3N / 19mm or more, more preferably 4N / 19mm or more, for example 5N / 19mm or more), the winding accuracy tends to be improved easily. In a preferred embodiment, the unwinding force of the adhesive tape roll can be 3 to 12 N / 12 mm (for example, 5 to 10 N / 19 mm). In particular, in a configuration using a thin (for example, 100 μm or less, further 80 μm or less) PVC film, it is preferable that the rewinding force of the adhesive tape roll is within the above range. The unwinding force of the adhesive tape roll is adjusted to an appropriate range depending on, for example, the composition of the supporting base material, the presence or absence of back treatment of the supporting base material, the composition of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, the thickness of the pressure-sensitive adhesive layer, and the like. can do.

Although not particularly limited, the technique disclosed herein has a low temperature tensile elongation at break of 60% or more (more preferably 70% or more, still more preferably 80% or more) measured by the method described in Examples described later. , For example, 100% or more) can be preferably applied to a wound adhesive tape roll. Such a PVC adhesive tape having high flexibility (stretchability) even at low temperatures (particularly, a PVC adhesive tape having a PVC film thickness of 100 μm or less and further 80 μm or less) has low temperature characteristics (in a wire harness, an electric wire In applications where it is wound around, it tends to be excellent in performance of preventing the occurrence of cracks at low temperatures), but generally tends to have low rewinding workability. Therefore, it is significant to apply the present invention to improve the rewinding workability. The technique disclosed herein can be preferably carried out, for example, in the form of an adhesive tape roll in which a PVC adhesive tape having a low temperature tensile elongation at break of about 100 to 200% (preferably 110 to 170%) is wound.

The total thickness of the PVC adhesive tape (total thickness of the supporting base material and the pressure-sensitive adhesive layer) constituting the pressure-sensitive adhesive tape roll disclosed herein is not particularly limited. The technique disclosed herein has a total thickness of less than about 120 μm (more preferably less than about 110 μm, more preferably less than about 100 μm, for example about 90 μm, from the viewpoint of thinning and weight reduction of the PVC adhesive tape. It can be preferably carried out in the embodiment (less than). Further, since good rewinding workability can be easily obtained, it is appropriate that the thickness of the PVC adhesive tape is about 55 μm or more, and usually about 60 μm or more (more preferably about 70 μm or more, still more preferably. It is preferably about 75 μm or more, for example, about 80 μm or more).

Although not particularly limited, the technique disclosed herein has a basis weight of the PVC adhesive tape of about 120 g / m ² or less, preferably about 110 g / m ² or less, from the viewpoint of reducing the weight of the PVC adhesive tape. More preferably, it can be carried out in an embodiment of about 100 g / m ² or less, for example, about 90 g / m ² or less. Further, since good rewinding workability can be easily obtained, it is appropriate that the basis weight of the PVC adhesive tape is about 55 g / m ² or more, and usually about 60 g / m ² or more (more preferably about). It is preferably 70 g / m ² or more, more preferably about 75 g / m ² or more, for example, about 80 g / m ² or more).

In the technique disclosed herein, the width of the PVC adhesive tape is not particularly limited, and can be appropriately set according to the purpose and application. The width of the PVC adhesive tape can be, for example, 5 mm to 55 mm, usually 10 mm to 40 mm, preferably 15 mm to 30 mm (typically 15 mm to 25 mm). In a PVC adhesive tape having such a width, the effect of applying the present invention can be preferably exhibited. The technique disclosed herein can be preferably implemented in the form of an adhesive tape roll in which a 19 mm wide PVC adhesive tape is rolled into a roll.

The diameter of the adhesive tape roll disclosed herein is not particularly limited, but from the viewpoint of winding workability, it is advantageous that the diameter of the adhesive tape roll is not too large. From this point of view, it is usually appropriate that the diameter of the adhesive tape roll is 20 cm or less (typically 5 cm to 20 cm). The technique disclosed herein can be suitably carried out in the form of an adhesive tape roll having a diameter in the range of 15 cm or less (eg, 5 cm to 15 cm).

<Use>
Since the adhesive tape roll disclosed herein is excellent in rewinding workability, various usage modes in which the adhesive tape is attached (typically wound) to the adherend while rewinding the adhesive tape roll are assumed. It can be preferably used in the field. For example, it is suitable for applications such as protection and bundling of electric wires and pipes, coating of corrugated tubes that surround and protect electric wires and the like, and electrical insulation. Among them, as a preferable application, in a wire harness (for example, a wire harness of an automobile or other vehicle, particularly a wire harness of a vehicle equipped with an internal combustion engine), a wire harness (typically a plurality of electric wires) constituting the wire harness. There are applications that can be wrapped around. Here, examples of a mode in which a PVC adhesive tape is wound around an electric wire constituting a wire harness include a mode in which a PVC adhesive tape is wound around the electric wire, and a cylinder (for example, a cylinder accommodating the electric wire). A mode in which a PVC adhesive tape is wrapped around a corrugated tube) is included. Further, the adhesive tape disclosed herein is not limited to the above-mentioned applications, and is used in various fields in which PVC adhesive tape has been conventionally used, for example, between layers of electric parts (transformers, coils, etc.), electronic parts, etc. It can also be suitably used in fields such as outer surface insulation, fixing, display, and identification.

Matters disclosed by this specification include:
(1) An adhesive tape roll in which an adhesive tape containing a PVC film and an adhesive layer arranged on one surface of the PVC film is wound in the longitudinal direction.
In the adhesive tape roll, the adhesive tape is wound by bringing the surface of the adhesive layer into contact with the back surface of the adhesive tape.
The 50% stretching force _{FE50 of the} adhesive tape is about 25 N / 19 mm or less, and the rewinding force _FUW [N / 19 mm] of the adhesive tape roll is the 50% stretching force _FE50 [N / 19 mm] of the adhesive tape. ], About 15% to about 80%, adhesive tape roll.
(2) the unwinding force F _UW is approximately 5N / 19mm~ approximately 10 N / 19 mm, the adhesive tape roll according to the above (1).
(3) The adhesive tape roll according to (1) or (2) above, wherein the thickness of the pressure-sensitive adhesive layer is approximately 5 μm to approximately 18 μm.
(4) The adhesive tape roll according to any one of (1) to (3) above, wherein the thickness of the PVC film is about 100 μm or less.
(5) The adhesive tape roll according to any one of (1) to (4) above, wherein the basis weight is about 100 g / m ² or less.
(6) The adhesive tape roll according to any one of (1) to (5) above, wherein the width of the adhesive tape is about 15 mm to about 25 mm.
(7) Any of the above (1) to (6), wherein the adhesive tape has a tensile elongation at break at −20 ° C. of about 80% or more (typically, about 80% or more and about 300% or less). Adhesive tape roll described in.
(8) The above (1) to (7), wherein the dynamic viscosity of the resin material constituting the PVC film is about 3000 Pa · s or less (typically, about 3000 Pa · s or less and about 1000 Pa · s or more). Adhesive tape roll described in.
(9) The adhesive tape roll according to any one of (1) to (8) above, wherein the PVC film contains an elastomer.
(10) The above elastomer is
(A) Chlorinated polyethylene having a chlorine content of approximately 25 to 50% by weight (for example, approximately 35 to 45% by weight).
(B) (Meta) acrylic acid ester-butadiene-styrene copolymer,
(C) Acrylonitrile-butadiene copolymer having an acrylonitrile content of about 15-50% by weight (eg, about 30-40% by weight), and (D) vinyl acetate content of about 30-75% by weight (eg, about 50%). The adhesive tape roll according to (9) above, which comprises one or more selected from ethylene-vinyl acetate copolymers (~ 65% by weight).
(11) The adhesive tape roll according to (9) or (10) above, wherein the content of the elastomer in the PVC film is about 1% by weight or more and about 30% by weight or less.
(12) The adhesive tape roll according to any one of (1) to (11) above, wherein the PVC film contains a plasticizer of about 10% by weight or more and about 60% by weight or less.
(13) The plasticizer is composed of benzoic acid ester, phthalic acid ester, terephthalic acid ester, trimellitic acid ester, pyromellitic acid ester, adipic acid ester, sebacic acid ester, azelaic acid ester, maleic acid ester and citric acid ester. The adhesive tape roll according to (12) above, which comprises one or more selected types.
(14) The adhesive tape roll according to any one of (1) to (13) above, wherein the PVC film contains a fatty acid metal salt.
(15) The adhesive tape roll according to (14) above, wherein the fatty acid metal salt is a stearic acid metal salt, a lauric acid metal salt, or a combination of a stearic acid metal salt and a lauric acid metal salt.
(16) The adhesive tape roll according to (14) or (15) above, wherein the content of the fatty acid metal salt in the PVC film is about 0.02% by weight or more and about 1% by weight or less.

(17) The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is selected from the rubber-based pressure-sensitive adhesive, the polyester-based pressure-sensitive adhesive, the urethane-based pressure-sensitive adhesive, the polyether-based pressure-sensitive adhesive, and the silicone-based pressure-sensitive adhesive. The adhesive tape roll according to any one of 16).
(18) The pressure-sensitive adhesive tape roll according to any one of (1) to (17) above, wherein the pressure-sensitive adhesive layer is a rubber-based pressure-sensitive adhesive layer containing a rubber-based pressure-sensitive adhesive as a main component.
(19) The adhesive tape roll according to any one of (1) to (18) above, wherein the pressure-sensitive adhesive layer contains natural rubber and synthetic rubber (for example, SBR) in a weight ratio of 10:90 to 90:10. ..
(20) The pressure-sensitive adhesive layer contains one or more pressure-imparting resins selected from rosin-based resins, petroleum resins, terpene-based resins, phenol-based resins, kumaron inden-based resins, and ketone resins. The adhesive tape roll according to any one of (1) to (19).
(21) The pressure-sensitive adhesive layer contains a rubber-based polymer and a petroleum resin as a pressure-imparting resin.
The adhesive tape roll according to any one of (1) to (20) above, wherein the content of the petroleum resin is 50 to 150 parts by weight with respect to 100 parts by weight of the rubber-based polymer.

(22) An adhesive tape roll in which an adhesive tape containing a PVC film and an adhesive layer arranged on at least one surface of the PVC film is wound in the longitudinal direction.
In the adhesive tape roll, the adhesive tape is wound by bringing the surface of the adhesive layer into contact with the back surface of the adhesive tape.
The thickness of the PVC film is about 50 μm or more and about 100 μm or less.
The thickness of the pressure-sensitive adhesive layer is about 5 μm to about 18 μm.
The width of the adhesive tape is about 15 mm to about 25 mm.
The PVC film contains an elastomer, a plasticizer, and a fatty acid metal salt.
The elastomers are (A) chlorinated polyethylene having a chlorine content of about 25 to 50% by weight (for example, about 35 to 45% by weight), (B) (meth) acryloacid ester-butadiene-styrene copolymer, ( C) Acrylonitrile-butadiene copolymer having an acrylonitrile content of about 15-50% by weight (eg, about 30-40% by weight), and (D) vinyl acetate content of about 30-75% by weight (eg, about 50-75% by weight). Contains one or more selected from the ethylene-vinyl acetate copolymers (65% by weight).
The content of the elastomer is approximately 1% by weight or more and approximately 30% by weight or less of the PVC film.
The pressure-sensitive adhesive layer is a rubber-based pressure-sensitive adhesive layer.
Unwinding force F _UW is approximately 5N / 19mm~ approximately 10 N / 19 mm, the adhesive tape roll.
(23) The plasticizer is composed of benzoic acid ester, phthalic acid ester, terephthalic acid ester, trimellitic acid ester, pyromellitic acid ester, adipic acid ester, sebacic acid ester, azelaic acid ester, maleic acid ester and citric acid ester. The adhesive tape roll according to (22) above, which comprises one or more selected types.
(24) The fatty acid metal salt is a stearic acid metal salt, a lauric acid metal salt, or a combination of a stearic acid metal salt and a lauric acid metal salt.
The adhesive tape roll according to (22) or (23), wherein the content of the fatty acid metal salt in the PVC film is about 0.02% by weight or more and about 1% by weight or less.
(25) The rubber-based pressure-sensitive adhesive layer contains a rubber-based polymer and a tack-imparting resin.
The rubber-based polymer contains natural rubber and synthetic rubber (for example, SBR) in a weight ratio of 10:90 to 90:10.
The adhesive tape roll according to any one of (22) to (24) above, which contains 50 to 150 parts by weight of a petroleum resin with respect to 100 parts by weight of the rubber-based polymer as the adhesive-imparting resin.
(26) The 50% stretching force _{FE50 of the} adhesive tape is about 25 N / 19 mm or less, and the rewinding force _FUW [N / 19 mm] of the adhesive tape roll is the 50% stretching force _{FE50 of the} adhesive tape. The adhesive tape roll according to any one of (22) to (25) above, which is about 15% to about 80% of N / 19 mm].

(27) A method of manufacturing a wire harness.
To prepare the adhesive tape roll according to any one of (1) to (26) above, and
A method for manufacturing a wire harness, which comprises winding the adhesive tape around an electric wire constituting the wire harness while rewinding the adhesive tape roll.
(28) A wire harness in which an adhesive tape unwound from the adhesive tape roll according to any one of (1) to (26) above is wound around an electric wire.

Hereinafter, some examples of the present invention will be described, but the present invention is not intended to be limited to those shown in such specific examples. In addition, "part" and "%" in the following description are based on weight unless otherwise specified.

<Material used>
The abbreviations of the materials used in the following examples are as follows.
(Fatty acid metal salt)
A1: Calcium stearate (product of Kishida Chemical Co., Ltd.)
A2: Calcium laurate (product of Kishida Chemical Co., Ltd.)
(Elastomer)
E1: Kaneka Corporation product, (meth) acrylic acid ester-butadiene-styrene copolymer, trade name "Kaneka B22"
E2: Zeon Corporation product, acrylonitrile-butadiene copolymer, acrylonitrile content 31-36%, trade name "Nipol 1052J"
E3: JSR Corporation product, acrylonitrile-butadiene copolymer, acrylonitrile content 41.5%, grade name "PN20HA"
E4: Nippon Synthetic Chemical Industry Co., Ltd. product, ethylene-vinyl acetate copolymer, vinyl acetate content 55%, trade name "Soabrene BH"
E5: Showa Denko Corporation product, chlorinated polyethylene, chlorine content 38.0-41.0%, trade name "Eraslen 401A"
E7: JSR Corporation product, styrene-butadiene block copolymer, linear structure, styrene content 40%, grade name "TR2000"

<Making adhesive tape>
(Example 1)
Based on solid content, 60 parts of SBR latex (Nippon Zeon Co., Ltd. product, product name "Nipol LX426"), 40 parts of natural rubber latex (GOLDEN HOPE product, product name "HYTEX HA") and 120 parts of petroleum resin emulsion are mixed. Then, an aqueous dispersion type rubber-based pressure-sensitive adhesive composition was prepared. As the petroleum resin emulsion, 75 parts of a petroleum resin (Exxon product, aliphatic hydrocarbon resin, trade name "Escolets 1202", softening point 100 ° C.) is dissolved in 25 parts of toluene, and a surfactant (Kao) is dissolved therein. A product manufactured by Co., Ltd., trade name "Emargen 920") (3.5 parts) and 46.5 parts of water were added and emulsified by stirring with a homomixer. Hereinafter, the adhesive composition will be referred to as "adhesive composition A".

Each raw material shown in Table 1 has a composition shown in the same table (that is, a composition containing 0.10% of fatty acid metal salt A1, 25% of plasticizer, 6% of elastomer E1 and the balance being PVC). After weighing, mixing and kneading, the film was molded into a long film shape having a thickness of 70 μm at a molding temperature of 150 ° C. by a calendar molding machine. In this way, the PVC film (supporting base material) according to Example 1 was obtained. Here, as the plasticizer shown in Table 1, diisononyl phthalate (J-PLUS Co., Ltd. product, trade name "DINP") was used. As the PVC shown in Table 1, polyvinyl chloride having an average degree of polymerization of 1000 (Shin-Etsu Chemical Co., Ltd. product, trade name “TK-1000”) was used.

The pressure-sensitive adhesive composition A is applied to one surface of the PVC film using a comma direct coater, dried, and wound to a length sufficient for the low-temperature winding test described later to roll the raw fabric. Obtained. The amount of the pressure-sensitive adhesive composition A applied was adjusted so that the pressure-sensitive adhesive layer having the thickness shown in Table 1 was formed after drying. The raw fabric roll was cut (slit) so that the width of the adhesive tape was 19 mm to obtain the adhesive tape roll according to Example 1.

(Examples 2 to 7 and Comparative Examples 1 to 2)
Adhesive tape rolls according to Examples 2 to 7 and Comparative Examples 1 and 2 in the same manner as in Example 1 except that the composition of the PVC film (supporting base material) and the thickness of the pressure-sensitive adhesive layer are as shown in Table 1. Was produced.
When the PVC film according to each example was stretched to about twice the length in the flow direction and the appearance was visually observed, the PVC films of Examples 1 to 5 and Comparative Examples 1 and 2 were all transparent. It was. Some white turbidity was observed in the PVC films of Examples 6 and 7.

<Measurement and evaluation>
(Measurement of 50% stretching force)
An adhesive tape (width 19 mm) unwound from the adhesive tape roll according to each example was cut to a length of 100 mm to prepare a measurement sample. In an environment of 23 ° C. and 50% RH, the above measurement sample was set in a tensile tester (manufactured by Shimadzu Corporation, Autograph AG-20kNG) (distance between chucks 50 mm), and the tensile speed was 300 mm / min in the longitudinal direction. The load applied to the tensile tester when stretched by 50% (ie, until 1.5 times longer) was recorded as a 50% stretching force (N / 19 mm).

(Measurement of rewinding force)
The measurement was performed in accordance with the measurement method of "high-speed rewinding force" described in JIS Z 0237 (2009). Specifically, in an environment of 23 ° C. and 50% RH, the adhesive tape roll according to each example is jigged on one chuck of the rewinding force measuring device (manufactured by Shimadzu Corporation, Autograph AG-Xplus series). The end of the adhesive tape drawn out from the adhesive tape roll was grasped by the other chuck. From this state, the rewinding force (N / 19 mm) was measured under the condition of the rewinding speed of 1 m / min.

(Evaluation of binding workability)
Assuming a situation in which the adhesive tape is wound around a plurality of electric wires and bound while rewinding the adhesive tape from the adhesive tape roll under the same conditions as the rewinding force measurement, the adhesive tape in the rewinding force measurement The rewinding situation was observed, and the binding workability was evaluated in the following three stages.
E: The adhesive tape rewound from the adhesive tape roll could be wound around the winding device with an appropriate and stable tension such that the variation in width dimension is 2 mm or less. At this time, no wrinkles or slack were visually observed (binding workability: excellent).
G: The adhesive tape rewound from the adhesive tape roll could be wound around the winding device with an appropriate and stable tension so that the variation in width dimension was 2 mm or less. At this time, no wrinkles were visually observed, but some slack was occasionally observed (binding workability: good).
P: The adhesive tape stretched significantly at the start of the measurement of the rewinding force, and the rewound adhesive tape could not be wound tightly on the winding device (poor binding workability).

The results obtained are shown in Table 1 together with the schematic configuration of the adhesive tape roll according to each example.

As shown in Table 1, 50% stretching force F _E50 Out of the adhesive tape roll PVC adhesive tapes are wound or less _{25N / 19mm, F UW / F} E50 is in the range of 15% to 80% In all of Examples 1 to 7, the rewinding workability (binding workability) was clearly better than that of Comparative Examples 1 and 2. The adhesive tape rolls of Examples 1 to 6 having a _FUW / _FE50 of 20% or more were particularly excellent in binding workability.

<Reference experiment example>
The adhesive tape constituting the adhesive tape roll according to each example is cut into a size of 10 mm in width and 100 mm in length to prepare a measurement sample, and tension is applied according to the test method of "plastic-tensile characteristics" described in JIS K 7161. The elongation at break was measured. The measuring device and measuring conditions used are as follows.
Equipment: Tensile tester (manufactured by Shimadzu Corporation, Autograph AG-20kNG).
Measurement conditions: Chuck distance 50 mm, tensile speed 300 mm / min.
Each measurement sample is pulled in the length direction under the above conditions, and from the chuck-to-chuck distance X (mm) at the time when the sample breaks, the following formula: tensile elongation at break (%) = (X-50) / 50 × 100; The low temperature tensile elongation at break was determined. As a result, the low-temperature tensile elongation at break of the adhesive tape according to Examples 1 to 7 was 114%, 147%, 110%, 120%, 107%, 138% and 49%, respectively, and according to Comparative Examples 1 and 2, respectively. The low temperature tensile elongation at break of the adhesive tape was 147% and 125%, respectively. That is, the adhesive tapes of Examples 1 to 6 and Comparative Examples 1 and 2 had a larger value of low-temperature tensile elongation at break and good flexibility (stretchability) at low temperatures than the adhesive tapes of Example 7. .. From this result, it can be seen that the adhesive tape rolls of Examples 1 to 6 are excellent in rewinding workability and also excellent in low temperature characteristics of the unwound adhesive tape.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above.

1 PVC adhesive tape (adhesive tape)
11 Support base material 11A 1st surface 11B 2nd surface 21 Adhesive layer 21A Surface (adhesive surface)
100 Adhesive Tape Roll

Claims (9)

And one pressure-sensitive adhesive layer disposed on a surface of a polyvinyl chloride film and the polyvinyl chloride film seen including, adhesive tape used in wound around the wires forming the wire harness, are wound in the longitudinal direction Adhesive tape roll
In the adhesive tape roll, the adhesive tape is wound by bringing the surface of the adhesive layer into contact with the back surface of the adhesive tape.
The thickness of the pressure-sensitive adhesive layer is 7 μm or more and 18 μm or less.
The 50% stretching force _{FE50 of the} adhesive tape is 15N / 19mm or more and 25N / 19mm or less, and the rewinding force _FUW [N / 19mm] of the adhesive tape roll is the 50% stretching force _{FE50 of the} adhesive tape. N / 19 mm] Ri 40% der than 20% or more,
The total thickness of the pressure-sensitive adhesive tape is Ru der less than 100μm, the pressure-sensitive adhesive tape roll. The unwinding force F _UW is 5~10N / 19mm, the adhesive tape roll according to claim 1. The adhesive tape roll according to claim 1 or 2 , wherein the polyvinyl chloride film has a thickness of 80 μm or less . The adhesive tape roll according to any one of claims 1 to 3 , wherein the polyvinyl chloride film contains an elastomer. The adhesive tape roll according to claim 4 , wherein the content of the elastomer in the polyvinyl chloride film is 1 to 30% by weight. The adhesive tape roll according to any one of claims 1 to 5 , wherein the polyvinyl chloride film contains 10 to 60% by weight of a plasticizer. The adhesive tape roll according to any one of claims 1 to 6 , wherein the polyvinyl chloride film contains a fatty acid metal salt. The adhesive tape roll according to claim 7 , wherein the content of the fatty acid metal salt in the polyvinyl chloride film is 0.02 to 1% by weight. It ’s a method of manufacturing wire harnesses.
The adhesive tape roll according to any one of claims 1 to 8 is prepared, and
A method for manufacturing a wire harness, which comprises winding the adhesive tape around an electric wire constituting the wire harness while rewinding the adhesive tape roll.

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