JP6265734B2 - Adhesive tape and tape substrate used therefor - Google Patents

Description

  The present invention is an adhesive tape including an adhesive portion and a tab portion, and is easily obtained by sandwiching the tab portion from an adherend adhered to both surfaces of the adhesive portion and stretching the tab portion in a direction substantially parallel to the adhesive surface. The present invention relates to a peelable adhesive tape.

  Stretchable and peelable adhesive tapes are used in various applications such as application to wall surfaces of articles such as hooks and hangers, windows and mirrors, and application to optical display devices such as optical lenses.

  For example, Patent Document 1 discloses a stretch-peelable adhesive article having first and second opposing main surfaces and a pull tab, the adhesive having a cross-sectional area having a predetermined width to thickness ratio. An article is disclosed. Patent Document 2 discloses a stretch-release tape including a tape base material made of a foamed sheet of a crosslinked polyolefin resin crosslinked using a metallocene catalyst.

Special table 2011-514419 gazette JP 2010-1226697 A

  With an adhesive tape that can be stretched and peeled, the adhesive tape is peeled off from the adherend by holding the tab of the adhesive tape and stretching it in a direction almost parallel to the adhesive surface, but a large force is required to stretch the tab. Then, the user may feel burdened. Here, it is desirable that the tab portion is inconspicuously small in terms of appearance when sticking to the adherend, but if the stress required to stretch the adhesive tape is large, it is more difficult to stretch with the small tab portion. Become.

  Further, in such an adhesive tape, when the tab portion is sandwiched and stretched, the tape base material is required to have a sufficient breaking strength to withstand a load sufficient to peel off the adhesive portion.

  Therefore, in view of these problems, an object of the present invention is to provide an adhesive tape having a tab portion that is easy to stretch and has sufficient breaking strength, and a tape substrate used for the adhesive tape.

  One aspect of the present invention relates to a stretchable and peelable adhesive tape including an adhesive portion having a first adhesive surface and a second adhesive surface and a tab portion that can be sandwiched. The said adhesive tape may have a tape base material which comprises at least one part of the said adhesion part and the said tab part, and the said tape base material is 60-99 mass% alkyl (meth) acrylate, and 1- It is obtained by radiation curing a mixture containing a monomer component containing 40% by mass of a polar monomer, a photopolymerization initiator, and 20 to 100 parts by mass of a styrene butadiene block copolymer with respect to 100 parts by mass of the monomer component. A resin composition is included.

  Moreover, the other side surface of this invention is related with the tape base material used for the adhesive tape which can be extended and peeled. The tape base material has a monomer component containing 60 to 99% by mass of alkyl (meth) acrylate and 1 to 40% by mass of a polar monomer, a photopolymerization initiator, and 20 to 100 parts per 100 parts by mass of the monomer component. A resin composition obtained by radiation-curing a mixture containing a part by mass of a styrene-butadiene block copolymer.

  According to the present invention, the adhesive tape can be easily peeled off from the adherend by holding and stretching the tab portion, and the initial stress at the time of elongation is low, and the tab portion can be easily stretched. An adhesive tape is provided. Moreover, according to this invention, the tape base material which has sufficient fracture strength and low stress at the time of extension which enables realization of such an adhesive tape is provided.

It is a perspective view showing one mode of implementation of an adhesive tape concerning the present invention. It is a perspective view showing one embodiment of the adhesive tape concerning the present invention. It is sectional drawing which shows one Embodiment of the adhesive tape which concerns on this invention. It is sectional drawing which shows other embodiment of the adhesive tape which concerns on this invention. It is sectional drawing which shows other embodiment of the adhesive tape which concerns on this invention. It is sectional drawing which shows other embodiment of the adhesive tape which concerns on this invention.

  A preferred embodiment of the present invention will be described below. In the present specification, “(meth) acryl” means “acryl or methacryl”, and “(meth) acryloyl” means “acryloyl or methacryloyl”.

  The adhesive tape which concerns on this embodiment is an adhesive tape which can be extended and peeled provided with the adhesion part which has a 1st adhesion surface and a 2nd adhesion surface, and the tab part which can be clamped.

  In this embodiment, an adhesive tape has a tape base material which comprises at least one part of an adhesion part and a tab part, and this tape base material is 60-99 mass% alkyl (meth) acrylate and 1-40 mass. % Resin composition obtained by radiation-curing a mixture containing a monomer component containing% polar monomer, a photopolymerization initiator, and 20 to 100 parts by mass of a styrene-butadiene block copolymer with respect to 100 parts by mass of the monomer component. Including things.

  In the present embodiment, the above-described resin composition provides a tape base material that achieves both a low elongation stress and a high breaking stress, and the initial elongation when the tab portion is sandwiched and stretched by the tape base material. An adhesive tape having a sufficiently low stress and an excellent breaking strength that can withstand stretch peeling is obtained. In other words, according to the adhesive tape according to the present embodiment, it is possible to sufficiently reduce the initial stress during elongation when the tab portion is sandwiched and stretched, and sufficient breaking strength to withstand stretch peeling is realized. it can.

  The tape base material according to the present embodiment has, for example, a stress at 200% elongation at 5 mm width of 3.0 N or less (that is, 3.0 N / 5 mm or less), and a breaking stress at 5 mm width of 15.0 N or more (that is, 15.0 N / 5 mm or more).

  The said mixture may further contain 20-100 mass parts tackifier with respect to 100 mass parts of said monomer components. A tape base material containing a resin composition obtained by radiation curing of such a mixture has adhesiveness, and according to such a tape base material, the tape base material alone can be provided without providing an adhesive layer or the like. The first and second adhesive surfaces can be formed.

  In one embodiment, the adhesive tape further comprises a first adhesive layer provided on one side of the tape base material and a second adhesive layer provided on the other side of the tape base material. It may be a thing. In such an embodiment, the first adhesive layer may form a first adhesive surface, and the second adhesive layer may form the second adhesive surface.

  In this aspect, the tab portion may be constituted by a portion where the tape base material is exposed without the first adhesive layer and the second adhesive layer being provided, and the first adhesive layer and the second adhesive layer. A non-adhesive film provided on the adhesive layer may be provided.

  In another embodiment, the adhesive tape may be such that one surface of the tape base material forms a first adhesive surface and the other surface of the tape base material forms a second adhesive surface. That is, when the tape substrate itself has tackiness, the formation of the adhesive layer as described above can be omitted.

  In this embodiment, the tab portion is configured to include, for example, a non-adhesive film provided on both surfaces of the tape base material.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an embodiment of the adhesive tape of the present invention, and FIG. 2 is a perspective view showing an embodiment of the adhesive tape of the present invention. The adhesive tape 2 includes an adhesive portion 4 having a first adhesive surface 4a and a second adhesive surface 4b, and a tab portion 6 that can be sandwiched, and is stretched by applying a stress F in a direction substantially parallel to the adhesive surface. The adhesive tape can be peeled off from the adherend.

  In one embodiment, the adhesive tape 2 adheres the first adhesive surface 4a and the adherend surface 8a of the first adherend 8 and adheres the second adhesive surface 4b and the second adherend 10 to each other. By adhering the surface 10a, the adherend 8 and the adherend 10 can be adhered. At this time, the adhesive tape 2 can be clamped so that the tab portion 6 protrudes from at least one of the extended portion 8a ′ of the first adherend 8 and the extended portion 10a ′ of the second adherend 10. Affixed.

  The adhesive tape 2 to which the first adherend 8 and the second adherend 10 are bonded is stretched by applying a stress F by pulling the tab portion 6 in a direction substantially parallel to the bonding surface. Can do. The stretched adhesive tape 2 gradually reduces the contact area between the first adhesive surface 4a and the second adhesive surface 4b and the adherend surfaces 8a and 10a due to the deformation of the adhesive part 4, and the first adherend 8 and / or the second adherend 10 is peeled off.

  Here, the first adherend 8 and the second adherend 10 are not particularly limited, and the adhesive tape 2 can be applied to various adherends. For example, as an example of the application, one of the adherends is a hook, a hanger, a clip, a holder, an organizer, a caddy, a basket, or a signboard, and the other adherend is a coated surface, glass, wood (for example, a dye) Or varnished wood), porcelain, fiberglass composites, plastic, plaster, concrete, brick, granite, ceramic, marble, stainless steel, walls, windows, mirrors, cabinets, doors, bathrooms It may be fixtures, vehicles, etc.

  Further, as another example of the application of the adhesive tape 2, it may be used in a high humidity environment. For example, the adhesive tape 2 can be adhered to a toilet (for example, a toilet tank), a bathtub, a sink, etc., and a shower room, a locker room, a steam room, a pool, a hot tub, a kitchen (for example, a kitchen sink, a dishwasher, a stain-proof plate) (Area, refrigerator, cooler).

  As an example of a further application of the adhesive tape 2, the adhesive tape 2 is used for fixing various articles to surfaces such as painted walls, plaster, concrete, glass, ceramic, fiberglass, metal, plastic, etc. be able to. Applicable items include wall hangings, organizers, holders, baskets, containers, ornaments (eg, holiday ornaments), calendars, posters, dispensers, wire clips, car body side moldings, carrying handles A sign such as a road sign, a vehicle mark, a transport mark, a reflector, and the like are included, but not limited thereto.

  The adhesive tape 2 can be used for attaching a non-slip mat, a wear-resistant mat or the like to the floor, the bottom of a bathtub or a shower, or fixing an article such as a rug to the floor. Also, the adhesive tape 2 can be used for various bonding and assembly applications in which at least two containers (for example, boxes) are bonded and separated later. Further, the adhesive tape 2 can be used for various buffering and sound insulation applications such as a cushioning material, a soundproof plate material, vibration damping, and a combination thereof arranged under an object. The adhesive tape 2 can be used for various closing applications including container closing (for example, box closing, food container closing, beverage container closing), diaper closing, and surgical drape closing. Moreover, the adhesive tape 2 can be used for various heat insulation uses. The adhesive tape 2 can be used for various sealing applications such as liquid, steam (for example, moisture), and dust gaskets. The adhesive tape 2 can also be used for various labels and signs such as removable labels (for example, memos, price tags, container identification labels). Moreover, the adhesive tape 2 can be used for various medical uses (for example, medical device labels in bandages, wound care, hospital environments, etc.). The adhesive tape 2 can also be used for various fastening applications such as fastening one object (eg, a vase or other wallet) to another object (eg, a table or bookshelf). Also, the adhesive tape 2 can be used for a variety of fixing applications such as fastening one or more components of the locking mechanism to a substrate (eg, adhering a child accident prevention lock to a cabinet or kitchen shelf). . Moreover, the adhesive tape 2 can be used for various mischief prevention labeling applications (for example, an anti-tampering label article). Further, the adhesive tape 2 can be used for abrasive articles (for example, sanding abrasives), polishing and polishing abrasives (for example, buffing pads, disk pads, hand pads, polishing pads), road marking articles, carpets ( Various other constructions, including, for example, carpet backings, electronic devices (eg, applications to secure batteries in a mobile phone or PDA (Personal Digital Assistant) housing to prevent unwanted movement) Can be incorporated.

Adhesive tape 2 has been described as a rectangular tape having a width W and length L _1, in the present invention, the shape of the adhesive tape is not limited thereto. For example, the adhesive tape 2 may be bonded to the adhesive portion 4 and the tab portion 6 so that the adhesive portion 4 can be deformed and peeled off from the adherend by pulling the tab portion 6. The shape can be changed as appropriate according to the application (the shape of the adherend, etc.), and the shape of the tab portion 6 can be changed as appropriate according to the ease of clamping and the problem in appearance.

  In the bonding portion 4, the width W in the direction perpendicular to the stress F applied by pulling the tab portion can be appropriately set according to the application, and is not particularly limited. In one aspect, the width W may be, for example, 1-50 mm, or 1-25 mm.

Further, the bonding portion 4, the stress length L ₂ of the parallel direction of the direction parallel to F can be appropriately set depending on the application, it is not particularly limited. In one embodiment, the length _{L 2} may be, for example, 10 to 100 mm. Moreover, not even limited to the ratio L _{2 /} W, for example, FIG. 2, the length L ₂ is described is greater aspect than the width W, length L ₂ may be less than or equal to the width W.

  Moreover, the thickness T of the adhesion part 4 can be suitably set according to the use, and there is no restriction | limiting in particular. The thickness T of the bonding portion 4 can be set to, for example, 0.1 to 2.0 mm, and preferably 0.2 to 1.2 mm.

  The adhesive tape 2 has a tape base material constituting at least a part of the adhesive portion 4 and the tab portion 6. As for a tape base material, both the main surfaces may comprise the 1st adhesion surface 4a of the adhesion part 4, and the 2nd adhesion surface 4b. Moreover, a tape base material has an adhesive layer on both the main surfaces, and this adhesive layer may comprise the 1st adhesive surface 4a and the 2nd adhesive surface 4b.

  In one embodiment, the tape substrate is based on a monomer component including 60 to 99% by mass of alkyl (meth) acrylate and 1 to 40% by mass of a polar monomer, a photopolymerization initiator, and 100 parts by mass of the monomer component. A resin composition obtained by radiation-curing a mixture containing 20 to 100 parts by mass of a styrene-butadiene block copolymer.

  In the present embodiment, the above-described resin composition provides a tape base material that achieves both a low elongation stress and a high breaking stress, and the initial elongation when the tab portion is sandwiched and stretched by the tape base material. An adhesive tape having a sufficiently low stress and an excellent breaking strength that can withstand stretch peeling is obtained.

  The tape base material according to the present embodiment has, for example, a stress at 200% elongation at 5 mm width of 3.0 N or less (that is, 3.0 N / 5 mm or less), and a breaking stress at 5 mm width of 15.0 N or more (that is, 15.0 N / 5 mm or more), which can achieve both a low elongation stress and a high breaking stress.

  As alkyl (meth) acrylate, the alkyl (meth) acrylate which has a C1-C20 alkyl group is preferable, and the alkyl (meth) acrylate which has a C4-C18 alkyl group is more preferable.

  Examples of the alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-octyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, Examples include palmityl (meth) acrylate and isododecyl (meth) acrylate.

  Moreover, as an alkyl (meth) acrylate, a homopolymer having a glass transition temperature (Tg) of −25 ° C. or less can be particularly preferably used. Such alkyl (meth) acrylates include n-butyl acrylate, isobutyl acrylate, pentyl acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-octyl (meth) acrylate, n-nonyl ( Examples include meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, palmityl (meth) acrylate, isododecyl (meth) acrylate, and the like.

  Examples of the polar monomer include an amide group-containing ethylenically unsaturated monomer, an amino group-containing ethylenically unsaturated monomer, and a carboxyl group-containing ethylenically unsaturated monomer.

  Examples of the amide group-containing ethylenically unsaturated monomer include (meth) acrylamide, N, N-dialkyl (meth) acrylamide (for example, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide), ( And (meth) acryloylmorpholine, N-vinylcaprolactam, N-vinylpyrrolidone, and the like.

  Examples of the amino group-containing ethylenically unsaturated monomer include N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropylacrylamide, 1-vinylimidazole, 2-vinylpyridine, 4-vinylpyridine and the like. .

  Examples of the carboxyl group-containing ethylenically unsaturated monomer include (meth) acrylic acid, carboxyl ethyl acrylate, and the like.

  The monomer component is preferably blended so that the alkyl (meth) acrylate and the polar monomer total 100 parts by mass. That is, the monomer component may be a monomer component of 100 parts by mass composed of 60 to 99 parts by mass of alkyl (meth) acrylate and 1 to 40 parts by mass of a polar monomer.

  The monomer component may contain a monomer other than alkyl (meth) acrylate and a polar monomer (hereinafter referred to as “third monomer”). Examples of the third monomer include isobornyl (meth) acrylate, phenoxyethyl acrylate, benzyl acrylate, 2-ethoxyethoxyethyl acrylate, and the like.

  The amount of alkyl (meth) acrylate based on the total amount of the monomer components is preferably 65% by mass or more, and more preferably 70% by mass or more. Further, the amount of the alkyl (meth) acrylate with respect to the total amount of the monomer components is preferably 98% by mass or less, and may be 97% by mass or less.

  The amount of the polar monomer with respect to the total amount of the monomer components is preferably 2% by mass or more, more preferably 3% by mass or more. When the amount of the polar monomer is 2% by mass or more, the breaking stress is further higher, and a suitable tape base material can be obtained from the stretchable and peelable adhesive tape. Moreover, the amount of the polar monomer with respect to the total amount of the monomer components is preferably 35% by mass or less, more preferably 30% by mass or less. When the amount of the polar monomer is 35% by mass or less, the stress at the time of 200% elongation is much lower, and a suitable tape base material can be obtained from an adhesive tape that can be stretched and peeled.

  When acrylic acid is used as the polar monomer, the amount of the polar monomer with respect to the total amount of the monomer components is 20% by mass or less, more preferably 15% or less, so that it is particularly suitable for stretchable and peelable adhesive tapes. A tape base material having time stress can also be obtained.

  Further, when N, N-dimethylacrylamide is used as the polar monomer, the amount of the polar monomer with respect to the total amount of the monomer components is 35% by mass or less, more preferably 30% by mass or less, so that the adhesive tape can be stretched and peeled. It is possible to obtain a tape substrate having a stress particularly suitable for elongation.

  The total amount of alkyl (meth) acrylate and polar monomer with respect to the total amount of monomer components is preferably 80% by mass or more, and may be 100% by mass.

  The photopolymerization initiator may be any polymerization initiator that can initiate polymerization of the monomer component by light irradiation. As the photopolymerization initiator, those usually used for the polymerization of the above monomer components can be appropriately selected and used.

  Examples of the photopolymerization initiator include 1-hydroxycyclohexyl phenyl ketone (Irgacure (R) 184 manufactured by BASF), 2,2-dimethoxy-2-phenylacetophenone (Irgacure (R) 651 manufactured by Ciba Specialty Chemicals). 2-hydroxy-2-methyl-1-phenyl-propan-1-one (Darocur (R) 1173 manufactured by Ciba Specialty Chemicals), 2-methyl-1- [4- (methylthio) phenyl] -2- Morpholinopropan-1-one (Irgacure (R) 907 manufactured by Ciba Specialty Chemicals), 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diisopropylthio Sandton, isopropylthioxanthone, 2,4,6 dichloride phosphine oxide or bis (2,6-dimethoxybenzoyl) -2,4,4-trimethylpentyl phosphine oxide and the like, can be mentioned. Moreover, as a photoinitiator, these 1 type, or 2 or more types can be used.

  The amount of the photopolymerization initiator to be blended in the mixture can be, for example, 0.05 to 3.0 parts by mass with respect to 100 parts by mass of the monomer component, and may be 0.05 to 1.0 parts by mass. , Or 0.10 to 0.60 parts by mass.

  Moreover, the said mixture contains 20-100 mass parts styrene butadiene block copolymer with respect to 100 mass parts of monomer components.

  The content of the styrene butadiene block copolymer in the mixture is preferably 20 to 80 parts by mass and more preferably 25 to 60 parts by mass with respect to 100 parts by mass of the monomer component.

  The styrene butadiene block copolymer is a copolymer having a styrene block and a butadiene block. The block structure of the styrene butadiene block copolymer is not particularly limited, and may be a diblock copolymer, a triblock copolymer, a radial block copolymer, or the like.

  The styrene block content in the styrene butadiene block copolymer is preferably 20% by mass or more, more preferably 25% by mass or more based on the total amount of the styrene butadiene block copolymer. When the content of the styrene block is within this range, the breaking stress of the tape base material tends to be further improved. The content of the styrene block is preferably 45% by mass or less, more preferably 40% by mass or less, based on the total amount of the styrene butadiene block copolymer. When the content of the styrene block is within this range, the stress at 200% elongation tends to be further reduced.

  The styrene butadiene block copolymer preferably has a solution viscosity at 25 ° C. of not more than 1500 cps, more preferably not more than 1000 cps when a 25 mass% toluene diluted solution is used. By selecting a styrene butadiene block copolymer capable of preparing a dilute solution having such a solution viscosity, a tape substrate can be easily produced.

  The above mixture may further contain a tackifier. By adding a tackifier to the above mixture, it is possible to impart tackiness to the tape substrate, and when the tape substrate has tackiness, the main surface of the tape substrate is used as the adhesive surface. be able to.

  As the tackifier, for example, a hydrogenated tackifier can be suitably used. By using a hydrogenated tackifier, tackiness can be imparted to the resin composition without inhibiting the polymerization of the monomer component.

  Examples of hydrogenated tackifiers include hydrogenated rosin esters (for example, Foral 85-E available from Eastman Chemical Japan), hydrogenated terpene resins, and alicyclic hydrogenated petroleum resins (for example, Arakawa Chemical). Partially hydrogenated or completely hydrogenated, such as Alcon M (partially hydrogenated) or Alcon P (fully hydrogenated), aromatic modified hydrogenated petroleum resin (eg Escorez 5600 available from Exxon Mobile), available from industry An additive resin or the like can be used.

  The compounding quantity of a tackifier can be 0-100 mass parts with respect to 100 mass parts of monomer components, for example, Preferably it is 10-60 mass parts. By making the compounding quantity of a tackifier into the said range, the tape base material which has adhesiveness suitable in order to form an adhesive surface can be obtained, maintaining sufficient breaking strength and low stress at the time of elongation.

  The above mixture may further contain a crosslinking agent. Examples of the crosslinking agent include polyfunctional acrylate, isocyanate crosslinking agent, epoxy crosslinking agent, oxazoline crosslinking agent, aziridine crosslinking agent, metal chelate crosslinking agent, melamine resin crosslinking agent, peroxide crosslinking agent and the like. It is done.

  Although the compounding quantity of a crosslinking agent is not specifically limited, For example, it can be 0-1.0 mass part with respect to 100 mass parts of monomer components, and is good also as 0.02-0.20 mass part. In addition, that the compounding quantity of a crosslinking agent is 0 mass part shows that a crosslinking agent is not mix | blended.

  The mixture further contains additives such as plasticizers (process oil, silicone oil, polyethylene glycol, etc.), fillers, anti-aging agents, adhesion promoters (chlorinated polyolefins, etc.), UV absorbers, pigments and the like. Also good. The compounding amount of these additives is not particularly limited as long as the tape base material has desired breaking strength and elongation stress, and is, for example, 0 to 10 parts by mass with respect to 100 parts by mass of the monomer component. It is good also as 2-5 mass parts.

  The resin composition contained in the tape substrate is obtained by radiation curing the above mixture. The resin composition is obtained, for example, by mixing the above-described components (monomer component, photopolymerization initiator, styrene butadiene block copolymer, and other additives as necessary), and polymerizing the monomer component by irradiation with ultraviolet rays. be able to. In addition, the resin composition is prepared by mixing a monomer component and a part of the photopolymerization initiator and irradiating with ultraviolet rays to prepare a prepolymer, and then the remainder of the photopolymerization initiator, the styrene butadiene block copolymer (and as necessary). Depending on the case, other additives) may be added and mixed, and ultraviolet rays may be irradiated for further polymerization.

  A tape base material is a tape-shaped base material containing a resin composition. The tape base material can be obtained, for example, by molding a resin composition into a tape shape. Moreover, a tape base material can also be obtained by, for example, radiation-curing the mixture formed into a tape shape.

  The thickness of a tape base material may be 0.1-2.0 mm, for example, and can also be 0.2-1.2 mm.

  The tape base material preferably has a stress at 200% elongation of 3.0 N or less (that is, a stress at 200% elongation of 3.0 N / 5 mm or less) at a width of 5 mm. According to such a tape base material, an adhesive tape that can be easily stretched and peeled with a small tensile force can be obtained. The stress at 200% elongation of the tape base material is more preferably 2.5 N / 5 mm or less, and further preferably 2.0 N / 5 mm or less. Further, the stress at 200% elongation of the tape base material may be 0.2 N / 5 mm or more, and may be 0.5 N / 5 mm or more.

  The tape base material preferably has a breaking stress at a width of 5 mm of 15.0 N or more (that is, a breaking stress of 15.0 N / 5 mm or more). Further, the breaking stress of the tape base material is more preferably 17.5 N / 5 mm or more, and further preferably 20.0 N / 5 mm or more.

  The tape base material preferably has an elongation at break of 600% or more, and more preferably 800% or more. When such a tape base material is applied to an adhesive tape, the adhesive portion is likely to be greatly deformed by pulling of the tab portion, and stretching and peeling are further facilitated. The elongation at break of the tape base material may be 2000% or less and may be 1500% or less.

The 200% elongation stress, breaking stress and elongation at break of the tape substrate can be measured by the following methods.
First, a strip-shaped test sample having a width of 5 mm and a length of 75 mm or more is prepared. The distance between the knobs of the tensile tester is set to 25 mm, and the test sample is pinched in the longitudinal direction. Next, the test sample pinched by a 25 mm pinch distance by a tensile tester was pulled until the test sample broke at a pulling speed of 500 mm / min until a 200% elongation stress (50 mm stretched and pinch distance , The elongation at break (elongation when the test sample broke), and the breaking stress (tensile stress when the test sample broke) are measured.

  As described above, in the adhesive tape 2, the tape base material constitutes at least a part of the adhesive portion 4 and the tab portion 6. Here, FIG. 3 is a sectional view showing an embodiment of the adhesive tape according to the present invention. FIG. 3 is a view corresponding to a cross-sectional view taken along the line II-II of the adhesive tape 2 shown in FIG.

  The adhesive tape 2 shown in FIG. 3 includes a tape base 3, a first adhesive layer 5 a provided on one side of the tape base 3, and a second provided on the other side of the tape base 3. Adhesive layer 5b. In the adhesive tape 2, the first adhesive layer 5a is provided to form the first adhesive surface 4a, and the second adhesive layer 5b is provided to form the second adhesive surface 4b.

  As an adhesive for forming the first adhesive layer 5a and the second adhesive layer 5b, an adhesive applied to a conventionally known stretchable and peelable adhesive tape can be appropriately selected and used.

  Examples of the adhesive include adhesive rubber-based adhesives such as natural rubber, olefin, silicone, polyisoprene, polybutadiene, polyurethane, styrene-isoprene-styrene and styrene-butadiene-styrene block copolymers, and other elastomers. Agents; acrylic adhesives such as copolymers of isooctyl acrylate and acrylic acid. More specifically, the adhesive may include, for example, at least one of a cross-linked acrylic copolymer, an acrylic block copolymer, and a silicone elastomer polymer. Suitable silicone elastomer polymers include, for example, urea-based silicone copolymers, oxamide-based silicone copolymers, amide-based silicone copolymers, urethane-based silicone copolymers, and mixtures thereof.

  In the adhesive tape 2, the first adhesive layer 5a and the second adhesive layer 5b are provided only at the adhesive portion, and both main surfaces of the tape base material 3 are exposed at the tab portion. That is, in the tab portion of the adhesive tape 2, one surface of the tape base material 3 forms the first tab surface 6a, and the other surface of the tape base material 3 forms the second tab surface 6b.

  In addition, in the adhesive tape 2 shown in FIG. 3, although both the main surfaces of the tape base material 3 comprise the 1st tab surface 6a and the 2nd tab surface 6b, when the tape base material 3 has adhesiveness The tab portion 6 may be configured by providing a non-adhesive film on both main surfaces of the tape substrate 3. By sticking such a non-adhesive film to both main surfaces of the tape base material 3, it becomes easy to pinch the tab portion, and workability at the time of peeling is improved.

  As the non-adhesive film, for example, a resin film such as a polyethylene terephthalate film, a polyethylene film, or a soft polyvinyl chloride film can be suitably used. Further, as the non-adhesive film, paper, woven fabric, non-woven fabric or the like can be used.

  FIG. 4 is a cross-sectional view showing another embodiment of the adhesive tape according to the present invention. The adhesive tape 12 shown in FIG. 4 has the tape base material 13 and the non-adhesive film 17a and the non-adhesive film 17b which are provided on both main surfaces of a tape base material, and comprise a tab part. In the adhesive tape 12, the non-adhesive film 17a and the non-adhesive film 17b are affixed to a part of the main surface of the tape base material 13, and the other part of the main surface of the tape base material 13 is exposed. An adhesive surface 14a and a second adhesive surface 14b are formed.

  In the adhesive tape 12, the tape base material 13 has adhesiveness. That is, the tape base material 13 includes a resin composition obtained by radiation curing a mixture containing a monomer component, a photopolymerization initiator, a styrene butadiene block copolymer, and a tackifier.

  Since the tape base material 13 has adhesiveness, the tape base material 13 can be adhered to the adherends on the first adhesive surface 14a and the second adhesive surface 14b, respectively, and can adhere between the adherends. . Moreover, in the tab part, the workability | operativity at the time of peeling is improved by sticking the non-adhesive film 17a and the non-adhesive film 17b on the tape base material 13. FIG.

  FIG. 5 is a cross-sectional view showing another embodiment of the adhesive tape according to the present invention. The adhesive tape 22 shown in FIG. 5 includes a tape base material 23, a first adhesive layer 25a and a second adhesive layer 25b provided on both main surfaces of the tape base material, and a first tab portion. Non-adhesive films 27a and 27b provided on the adhesive layer 25a and the second adhesive layer 25b. In the adhesive tape 22, the first adhesive layer 25a and the second adhesive layer 25b form the first adhesive surface 24a and the second adhesive surface 25b, and the non-adhesive films 27a and 27b are the first tab surface. 26a and a second tab surface 27b.

  In the adhesive tape 22, the tape substrate 23 may be non-adhesive or adhesive. In addition, as an adhesive agent which forms the 1st adhesive bond layer 25a and the 2nd adhesive bond layer 25b, it is the same as the adhesive agent which forms the above-mentioned 1st adhesive bond layer 5a and the 2nd adhesive bond layer 5b. The thing can be illustrated. Moreover, as the non-adhesive films 27a and 27b, the same thing as the above-mentioned non-adhesive films 17a and 17b can be illustrated.

  In the adhesive tape 22, after providing the adhesive layers 25a and 25b on both main surfaces of the tape base material 23, the non-adhesive films 27a and 27b are adhered to the tab portions to improve workability. Such an adhesive tape 22 only has to form the adhesive layers 25a and 25b uniformly on the tape base material 23, and has an advantage of excellent work efficiency at the time of manufacture.

  FIG. 6 is a cross-sectional view showing still another embodiment of the adhesive tape according to the present invention. The adhesive tape 32 shown in FIG. 6 includes a tape base material 33, a first adhesive layer 35a and a second adhesive layer 35b provided on both main surfaces of the tape base material, and a first tab portion. The non-adhesive films 37a and 37b provided on the adhesive layer 35a and the second adhesive layer 35b, and a part of the second adhesive surface 34b on the second adhesive layer 35b in the adhesive portion so as to cover And a provided peeling assisting film 39.

  In the adhesive tape 32, the first adhesive layer 25a forms a first adhesive surface 34a, the second adhesive layer 25b forms a second adhesive surface 34b, and a part of the second adhesive surface 34b. Is covered with a peeling assist film 39. With such a configuration, when the adhesive tape 32 is stretched and peeled from between the adherends, the second adhesive surface 34b becomes easier to peel from the adherend earlier than the first adhesive surface 34a. Therefore, for example, when the first adhesive surface 34a is adhered to a small article such as a hook, the second adhesive surface 34b is adhered to a wall surface, etc., and the small article is attached to the wall surface, the adhesive tape 32 is stretched and peeled off. Then, the second adhesive surface 34b and the wall surface are easily peeled off, and the adhesive tape 32 can be peeled from the wall surface while the small article is held on the first adhesive surface 34a.

The peeling assist film 39 is a non-adhesive film, is provided on the second adhesive layer 35b, covers at least part of the second adhesive surface 34b, and has a contact area between the adherend and the adhesive surface. It is to reduce. For example, the peeling auxiliary film 39 can have the same length as the second adhesive surface 34 b in the width direction of the adhesive tape 32. Further, in the longitudinal direction of the adhesive tape 32, the length _{L 3} of the release auxiliary film 39 may, for example, be a 2 to 10 mm, can be a 4 to 8 mm.

  In the adhesive tape 32, the tape base material 33 may be not sticky or may be sticky. In addition, as an adhesive agent which forms the 1st adhesive bond layer 35a and the 2nd adhesive bond layer 35b, it is the same as the adhesive agent which forms the above-mentioned 1st adhesive bond layer 5a and the 2nd adhesive bond layer 5b. The thing can be illustrated. Moreover, as the non-adhesive films 37a and 37b, the same thing as the above-mentioned non-adhesive films 17a and 17b can be illustrated. Moreover, as the peeling auxiliary film 39, the same film as the non-adhesive films 17a and 17b can be used.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, the adhesive tape according to the present invention may be one in which a peeling assisting film is adhered to the second adhesive surface 4b or 14b of the adhesive tape 2 shown in FIG. 3 or the adhesive tape 12 shown in FIG.

  Moreover, this invention relates to the tape base material which can be applied suitably to the above-mentioned adhesive tape in one side surface, and relates to the manufacturing method of the adhesive tape using the said tape base material in another side surface. . Moreover, this invention can also be called the connection method of the to-be-adhered body using the above-mentioned adhesive tape as another side surface.

  EXAMPLES Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to an Example.

[Production Example 1: Preparation of adhesive layer]
Monomer components and other components were mixed at a mass ratio shown in Table 1, and stirred at 65 ° C. for 24 hours in a container to obtain a mixture. The obtained mixture was placed on a 50 μm-thick peeled PET film (manufactured by Mitsubishi Chemical Corporation), covered with the same kind of PET film from the upper surface, and coated with a knife coating method while sandwiched between two PET films. Subsequently, cured by irradiating for 3 minutes with ultraviolet rays in the intensity of 0.5 mW / cm ² at a wavelength of 300 to 400 nm, then the UV intensity of 7.0 mW / cm ² at a wavelength of 300 to 400 nm 3 minutes An adhesive layer having a thickness of 140 μm was prepared.

  In the table, “2EHA” represents 2-ethylhexyl acrylate, “N, N-DMA” represents N, N-dimethyl methacrylate, “DMAEA” represents dimethylaminoethyl acrylate, and “ECA”. Represents ethyl carbitol acrylate (2-ethoxyethoxyethyl acrylate), and “AA” represents acrylic acid.

  In the table, “D 1173” represents a photopolymerization initiator, Darocur 1173 (manufactured by BASF), “HDDA” represents hexanediol diacrylate, and “SBS” represents a styrene butadiene block copolymer (styrene-butadiene copolymer). -Styrene block copolymer, "D1118K" manufactured by Kraton Polymer Japan, 33% by mass of styrene block), and "M115" indicates Arkon M115 (made by Arakawa Chemical Industries) as a tackifier.

[Example 1]
Monomer components and other components were mixed at a mass ratio shown in Table 2, and stirred at 65 ° C. for 24 hours in a container to obtain a mixture. The obtained mixture was placed on a 50 μm-thick peeled PET film (manufactured by Mitsubishi Chemical Corporation), covered with the same kind of PET film from the upper surface, and coated with a knife coating method while sandwiched between two PET films. Subsequently, cured by irradiating for 3 minutes with ultraviolet rays in the intensity of 0.5 mW / cm ² at a wavelength of 300 to 400 nm, then the UV intensity of 7.0 mW / cm ² at a wavelength of 300 to 400 nm 3 minutes A tape substrate having a thickness of 600 μm was prepared.

  The produced tape base material could be used alone as an adhesive tape. Moreover, it was also possible to laminate an adhesive layer obtained by the method described in Production Example 1 on both main surfaces of the tape base material to obtain an adhesive tape.

  In addition, about the obtained tape base material, the stress at 200% elongation, elongation at break, and break stress were measured by the following methods. First, a tape sample was cut into a strip shape having a width of 5 mm and a length of 75 mm to prepare a test sample. Next, the test sample is pinched by a tensile tester at a distance of 25 mm between the tabs and pulled at a pulling speed of 500 mm / min until the test sample breaks, and the stress at 200% elongation (extension by 50 mm, the distance between the tabs reaches 75 mm). The tensile stress when the test sample broke), the elongation at break (elongation when the test sample broke), and the breaking stress (tensile stress when the test sample broke). As a result of measurement, the stress at 200% elongation was 1.9 N / 25 mm, the elongation at break was 1235%, and the stress at break was 17.2 N / 25 mm.

[Comparative Examples 1 to 7]
A tape substrate having a thickness of 600 μm was produced in the same manner as in Example 1 except that the mixture was prepared at a mass ratio shown in Table 2 or Table 3. Moreover, the adhesive bond layer obtained by the method of manufacture example 1 was laminated on both the main surfaces of the produced tape base material, and the adhesive tape was obtained.

  Moreover, about the obtained tape base material, the stress at 200% elongation, elongation at break and breaking stress were measured in the same manner as in Example 1. The measurement results were as shown in Table 2 or Table 3.

  In the table, “BA” represents n-butyl acrylate, “SEBS” represents a linear styrene ethylene butene block copolymer (manufactured by Kraton Polymer: G1652), and “SEPS 1” represents styrene ethylene propylene glock copolymer (manufactured by Kuraray). : Septon 2002), “SEPS2” indicates a linear styrene ethylene propylene block copolymer (Kuraray: Septon 2007), “SIS1” indicates a linear styrene isoprene block copolymer (Clayton polymer: D1107), “SIS2 "Represents a linear styrene isoprene block copolymer (Clayton polymer: D1119) and" SIS3 "represents a linear styrene isoprene block copolymer (DEXCO: Vector 4421). I "radial styrene-isoprene block copolymer (Kraton Polymer: D1124) shows a.

  In the table, “P90” indicates Arkon P90 (made by Arakawa Chemical Industries) as a tackifier, and “M90” shows Arkon M90 (made by Arakawa Chemical Industries) as a tackifier.

[Examples 2 to 5]
A tape substrate having a thickness of 600 μm was produced in the same manner as in Example 1 except that the mixture was prepared at a mass ratio shown in Table 4.

  The produced tape base material could be used alone as an adhesive tape. Moreover, it was also possible to laminate an adhesive layer obtained by the method described in Production Example 1 on both main surfaces of the tape base material to obtain an adhesive tape. About the obtained tape base material, when the stress at 200% elongation, elongation at break and breaking stress were measured in the same manner as in Example 1, the measurement results were as shown in Table 4.

  In the table, “LA” represents lauryl acrylate and “PA” represents palmityl acrylate.

[Examples 6 to 9 and Comparative Examples 8 to 9]
A tape substrate having a thickness of 600 μm was produced in the same manner as in Example 1 except that the mixture was prepared at a mass ratio shown in Table 5 or Table 6.

  The produced tape base material could be used alone as an adhesive tape. Moreover, it was also possible to laminate an adhesive layer obtained by the method described in Production Example 1 on both main surfaces of the tape base material to obtain an adhesive tape. The obtained tape base material was measured for stress at 200% elongation, elongation at break and stress at break by the same method as in Example 1. The measurement results were as shown in Table 5 or Table 6.

[Examples 10 to 15]
A tape substrate having a thickness of 600 μm was produced in the same manner as in Example 1 except that the mixture was prepared at a mass ratio shown in Table 7 or Table 8.

  The produced tape base material could be used alone as an adhesive tape. Moreover, it was also possible to laminate an adhesive layer obtained by the method described in Production Example 1 on both main surfaces of the tape base material to obtain an adhesive tape. About the obtained tape base material, when the stress at 200% elongation, elongation at break and stress at break were measured in the same manner as in Example 1, the measurement results were as shown in Table 7 or Table 8.

  In the table, “IOA” represents isooctyl acrylate and “R972” represents hydrophobic fumed silica.

<Retention force performance evaluation>
The tape base material produced in Example 9 (hereinafter referred to as “adhesive tape 1”) and the adhesive layer obtained by the method described in Production Example 1 were laminated on both main surfaces of the tape base material. About the obtained adhesive tape (henceforth "adhesive tape 2"), holding power performance evaluation was performed by the following method.

  Polypropylene (PP) plate (low surface energy surface) (2 mm × 25 mm × 100 mm: manufactured by Nippon Polypro) and polyvinyl chloride (PVC) plate (acidic surface) (2 mm × 25 mm × 100 mm: Mitsubishi Chemical Corporation) Two types of XP103) were prepared, and the respective adherend surfaces were washed with isopropyl alcohol (IPA). Moreover, a clean stainless steel plate (SUS-304) (0.5 mm × 30 mm × 60 mm) was prepared as another adherend.

  Cut the adhesive tape to a size of 12 mm x 20 mm, attach one side of the adhesive tape to the stainless steel plate and the other side to the polypropylene plate, and press the whole using a 5 kg roller (one reciprocation). A test piece was prepared. In the same procedure, a test piece was prepared in which one surface of the adhesive tape was attached to the surface of a stainless steel plate and the other surface was attached to a polyvinyl chloride plate. After curing these test pieces in an oven at 40 ° C. for 30 minutes, a 1 kg weight was suspended at a low angle of 2 degrees, and the holding time until each weight dropped was measured up to a maximum of 1080 minutes. A similar holding test was performed on a 0.8 kg weight. The results are shown in Table 9.

  Both the adhesive tape 1 and the adhesive tape 2 showed high retainability with respect to a low surface energy surface, and it was confirmed that they can be effectively used as an adhesive tape. In addition, the adhesive tape 2 showed a high holding force with respect to the polyvinyl chloride surface, and it was confirmed that various adhesive surfaces can be accommodated by providing an adhesive layer.

  2 ... Adhesive tape, 4 ... Adhesive part, 6 ... Tab part, 8 ... First adherend, 10 ... Second adherend.

Claims (6)

A stretchable peelable adhesive tape comprising an adhesive portion having a first adhesive surface and a second adhesive surface and a tab portion that can be sandwiched,
Having a tape base material constituting at least a part of the adhesive portion and the tab portion;
The tape substrate is
A monomer component containing 60 to 99% by mass of alkyl (meth) acrylate and 1 to 40% by mass of polar monomer, a photopolymerization initiator, and 20 to 100 parts by mass of a styrene butadiene block with respect to 100 parts by mass of the monomer component An adhesive tape comprising a resin composition obtained by radiation-curing a mixture containing a copolymer.   2. The adhesive tape according to claim 1, wherein the tape base material is a tape base material having a stress at 200% elongation at 5 mm width of 3.0 N or less and a breaking stress at 5 mm width of 15.0 N or more.   The adhesive tape according to claim 1 or 2, wherein the mixture further contains 20 to 100 parts by mass of a tackifier with respect to 100 parts by mass of the monomer component.   The adhesive tape according to claim 1, wherein the polar monomer is one or more monomers selected from the group consisting of N, N-dimethyl methacrylate, dimethylaminoethyl acrylate, and acrylic acid. . A tape base material used for an adhesive tape that can be stretched and peeled,
A monomer component containing 60 to 99% by mass of alkyl (meth) acrylate and 1 to 40% by mass of polar monomer, a photopolymerization initiator, and 20 to 100 parts by mass of a styrene butadiene block with respect to 100 parts by mass of the monomer component A tape substrate comprising a resin composition obtained by radiation curing a mixture containing a copolymer. The stress at 200% elongation at 5 mm width is 3.0 N or less,
The tape base material according to claim 5 whose breaking stress in 5 mm width is 15.0 N or more.

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