JP5097795B2 - Stretch release tape - Google Patents

Description

  The present invention relates to a stretched release tape that is peeled off by pulling in a direction substantially parallel to a surface to be applied, and more specifically to a technique for improving the anchoring property of an adhesive to a tape substrate.

  When pasting posters, hooks, etc. on the wall, they have been fixed to the wall using a thumbtack or double-sided adhesive tape. However, in the method using a thumbtack, a hole is always opened in the object to be pasted such as a wall surface or a poster, and the object is scratched. In addition, the method using the double-sided adhesive tape has problems such as part of the object to be peeled off due to the adhesive force at the time of removal, or glue remaining on the wall surface.

  Therefore, recently, a part of stretch-peeling tape that can be easily peeled off by anyone is difficult to damage the object to be pasted and the wall surface. For example, as disclosed in Patent Document 1, this stretch-release tape is formed by applying a pressure-sensitive adhesive to the surface of a tape base material made of a highly elastic material made of foamed resin, rubber, or the like. By gripping and pulling in parallel along the application surface, the adhesive area of the tape is gradually reduced, so that it can be peeled off cleanly.

JP 2000-44897 A

  However, the conventional stretch-release tape uses a relatively good stretchable material such as EVA resin (ethylene vinyl acetate copolymer) or foamed resin as a base material so that it can be stretch-released. Peeling is likely to occur at the interface between the tape base material and the pressure-sensitive adhesive layer that is sometimes extended, and a part of the pressure-sensitive adhesive is left on the wall surface, which causes a problem in anchoring properties.

  In order to improve the anchoring property of the adhesive to the tape base material, the adhesive should be made stronger. However, when the adhesive is made stronger, for example, a thin sticker such as a poster. On the contrary, the retainability to the adherend surface such as a kimono or a wall surface becomes too strong, and there is a risk of being torn or damaged.

  Then, this invention was made | formed in order to solve the subject mentioned above, The objective is to provide the extending | stretching peeling tape which improved the anchoring property of the adhesive with respect to a tape base material.

  In order to achieve the above-described object, an adhesive tape is formed by forming an adhesive layer on one or both sides of a tape base material having rubber elasticity, and the adhesive tape attached to the application surface is attached to the application surface. In a stretched release tape that can be peeled off by pulling in a substantially parallel direction, the tape base material is composed of a mixed composition of EVA (ethylene vinyl acetate copolymer) resin and synthetic rubber, and the rubber component is SEBS. (Styrene-ethylene-butylene-styrene block copolymer) is characterized by being blended in an amount of 10 to 100 parts by weight with respect to 100 parts by weight of the EVA (ethylene vinyl acetate copolymer) resin.

  In the present invention, the pressure-sensitive adhesive layer is preferably made of a synthetic rubber-based pressure-sensitive adhesive.

  According to the present invention, the tape base material is a mixed composition of EVA (ethylene vinyl acetate copolymer) resin and synthetic rubber, the rubber component is SEBS (styrene-ethylene-butylene-styrene block copolymer), and EVA. (Ethylene vinyl acetate copolymer) By blending 10 to 100 parts by weight with respect to 100 parts by weight of the resin, the stretchability of the substrate can be further improved, and even when the tape substrate is stretched, the tape base Throwing peeling is less likely to occur between the material and the adhesive. Further, it is more preferable to use SEBS having good compatibility with EVA as a rubber component because the light resistance is hardly discolored.

  Moreover, by using the above-mentioned pressure-sensitive adhesive layer as a synthetic rubber-based pressure-sensitive adhesive, the affinity of the pressure-sensitive adhesive with respect to the substrate can be further improved, and the interfacial peeling of the pressure-sensitive adhesive can be effectively suppressed.

The disassembled perspective view which shows the typical structure of the extending | stretching peeling tape which concerns on one Embodiment of this invention. The exploded sectional view of the extending release tape of the above-mentioned embodiment. The schematic diagram which shows the use condition of the extending | stretching peeling tape, and the state at the time of extending | stretching. Explanatory drawing explaining the procedure of an evaluation method.

  Next, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view schematically showing the structure of a stretched release tape according to an embodiment of the present invention, and FIG. 2 is an exploded sectional view thereof.

  In this example, the stretch-release tape 1 is a so-called double-sided pressure-sensitive adhesive tape in which pressure-sensitive adhesive layers 21, 22 are formed on both sides of a tape substrate 11. , 22 are detachably attached to the separators 31 and 32.

  On both surfaces (right end side in FIG. 2) on one end side of the stretch release tape 1, grip portions 41 and 42 that are gripped by a hand when being pulled and peeled are provided. For the grip portions 41 and 42, for example, a resin film formed in a rectangular shape can be used, and is attached to the adhesive layers 21 and 22 of the stretched release tape 1.

  The tape substrate 11 is made of a mixed composition of EVA (ethylene vinyl acetate copolymer) and a synthetic rubber, and has rubber elasticity that can be stretched and peeled at a predetermined stretch rate.

  A preferable compounding ratio of the synthetic rubber to EVA is 10 to 100 parts by weight with respect to 100 parts by weight of EVA. According to this, the stretchability is further improved, the followability to the deformation of the tape base material 11 due to the stretch is also improved, and the throwing failure is less likely to occur between the base material and the adhesive.

  In addition, when the compounding ratio of the synthetic rubber to EVA is less than 10 parts by weight, the anchoring force between the base material and the pressure-sensitive adhesive is insufficient, and the anchoring and breaking may be easily caused. On the other hand, when the amount exceeds 100 parts by weight, the base material becomes too soft and the retainability may be lowered, which is not preferable. In this embodiment, throwing destruction refers to a state in which the adhesive is peeled off from the tape base material 11 and remains on the surface to be adhered, that is, a so-called adhesive residue state. The fallen state is called interface destruction.

  As a synthetic rubber, SEBS (styrene-ethylene-butylene-styrene block copolymer) is suitable because it has good compatibility with EVA and is excellent in light resistance, but other synthetic rubber materials (for example, SBR, IR, EPDM, etc.) and various elastomers may be used.

  As shown in FIG. 2, the pressure-sensitive adhesive layers 21 and 22 are formed by uniformly applying a pressure-sensitive adhesive with a predetermined thickness on both surfaces of the tape substrate 11. In the case of a single-sided adhesive tape, the adhesive is formed only on one side of the tape substrate 11.

  In order to improve the anchoring property with respect to the tape substrate 11, it is preferable to use a synthetic rubber-based adhesive for the adhesive layers 21 and 22. A preferable rubber-based pressure-sensitive adhesive is a SIS (styrene-isoprene-styrene block copolymer) -based pressure-sensitive adhesive containing a terpene-based pressure-sensitive adhesive, but other synthetic rubber-based pressure-sensitive adhesives may be used. Can be arbitrarily selected according to the specification.

  Furthermore, 0.1-20 weight part of acrylic beads 5 (refer FIG.3 (b)) are mix | blended with the adhesive layers 21 and 22 as a granular material, A more preferable mixture ratio is 0.5-2.0 weight part. is there.

  The acrylic beads 5 contained in the pressure-sensitive adhesive layers 21 and 22 are suitable because fine particles having a particle diameter of about 10 μm made of PMMA (polymethylmethacrylate) are less likely to lose transparency, but other particles ( For example, ceramics or metal powder may be used, and can be appropriately selected according to the specification.

  By adding the acrylic beads 5 to the pressure-sensitive adhesive layers 21 and 22, as shown in FIG. 3B, the surface of the pressure-sensitive adhesive layers 21 and 22 thinned with the stretching when the stretched release tape 1 is stretched. Since the fine irregularities are formed by the acrylic beads 5, the contact area between the adherend surface and the adhesive surface is reduced, and the stretched release tape 1 can be peeled off with a small force.

  Similarly, fine irregularities appear on the back surfaces of the pressure-sensitive adhesive layers 21 and 22 (the surface on the tape base material 11 side), but the tape base material 11 is blended with synthetic rubber, and the pressure-sensitive adhesive layer 21 , 22 is made of a synthetic rubber-based pressure-sensitive adhesive, and peeling (throwing destruction) does not occur at the interface between the tape substrate 11 and the pressure-sensitive adhesive layers 21, 22 due to stretching.

  Next, an example of a procedure for using the stretched release tape 1 will be described. As shown in FIGS. 3A and 3B, first, one separator (adhesive layer 21 side) (not shown) is peeled off, and the stretch release tape 1 is attached to the adherend surface of the adherend 6 (FIG. 3 ( In a), paste on the right side).

  Next, the other unshown separator (adhesive layer 22 side) is peeled off, and the adhesive layer 22 side of the stretch release tape 1 is pressed against the wall surface W, whereby the adherend 6 is held on the wall surface W.

  In removing the adherend 6 from the wall surface W, as shown in FIG. 3 (b), while holding the adherend 6 with one hand, the grip provided at the lower end of the stretch release tape 1 with the other hand. The portions 41 and 42 are gripped, and the stretch-release tape 1 is pulled downward (in the direction of the arrow in the figure) along the wall surface W.

  By pulling downward, the stretch-release tape 1 begins to peel from the narrow and partially narrowed portion, and the adhesive layers 21 and 22 are also stretched and thinned by stretching of the stretch-release tape 1, and the pressure-sensitive adhesive inside The acrylic beads 5 blended in the surface appear on the surface to form fine irregularities.

  Due to the fine unevenness, the contact area of the pressure-sensitive adhesive layers 21 and 22 with respect to the adherend 6 and the wall surface W is reduced, and the peeling is further promoted. Without leaving glue from the wall surface W, it falls off cleanly.

  Next, specific examples of the present invention and comparative examples thereof will be described. First, a stretch release tape was produced by the following method.

[Production of tape substrate]
SEBS (Clayton G1657 made by Kraton Polymer Co., Ltd.) was blended according to Examples 1-1 to 1-4 and Comparative Examples 1-1 to 1-2 with respect to 100 parts by weight of EVA (Tosoh Ultrasen 635). The obtained mixed composition was extruded into a 150 μm film using a T-die extruder to produce a tape substrate.
(Preparation of adhesive)
150 parts by weight of terpene resin (Clearon P-135 manufactured by Yashara Chemical Co., Ltd.) and 100 parts by weight of SEBS (Clayton G-1657 manufactured by Kraton Polymer Co., Ltd.) and paraffinic oil (Diana Process Oil PW-90 manufactured by Idemitsu Kosan Co., Ltd.) 5 parts by weight of acrylic bead masterbatch (Mitsui / Sumitomo Polyolefin Evolue EMB-23: particle size of about 10 μm, blending amount 10%) is added to each 50 parts by weight, and kneaded with a pressure kneader for synthesis. A rubber adhesive was obtained.
[Production of stretch release tape]
The above-mentioned synthetic rubber-based pressure-sensitive adhesive is uniformly applied to both surfaces of the tape base material obtained in the above step so as to have a layer thickness of 300 μm to form a pressure-sensitive adhesive layer, and then PET (polyethylene terephthalate) on both surfaces. ) A separator made of a film (SP-PET-03 # 50) was bonded to both sides and cured for a predetermined time to obtain a stretch release tape.

[Throwing property test]
First, in order to determine the anchoring quality at the interface between the tape base material and the pressure-sensitive adhesive, four types of mixed compositions obtained by blending synthetic rubbers according to Examples 1-1 to 1-4 were used. As a comparative example 1-1 and 1-2, a total of six types of stretch-release tapes with a tape base material made only of EVA resin and synthetic rubber added to the tape base material, and these are made 15 × 25 mm long Cut and paste the stainless steel plates 71 and 72 on both adhesive surfaces, add 1kg load Wt to the stretch release tape in a 40 ° C atmosphere, and set the holding time until the stretch release tape falls in advance. Measured and observed the interface state of the stretched release tape after dropping (see FIG. 4A). The evaluation method was evaluated as x when there was a thrown break, △ when there was a thrown break, and ○ when there was no thrown break. The evaluation results are shown below.

<< Example 1-1 >>
[Substrate] [EVA] 100 wt%
[SEBS] 10wt%
[Thickness] 150μm
[Adhesive] [Acrylic beads] 5wt%
[Thickness] 300 μm
[Throwing property] △ Some throwing breakage [Retention time] 340 minutes Throwing property is weak, but retention property is good

<< Example 1-2 >>
[Substrate] [EVA] 100 wt%
[SEBS] 30wt%
[Thickness] 150μm
[Adhesive] [Acrylic beads] 5wt%
[Thickness] 300 μm
[Throwing property] ○ Fracture at the interface [Retention time] 5200 minutes Both anchoring property and retaining property are significantly improved.

<< Example 1-3 >>
[Substrate] [EVA] 100 wt%
[SEBS] 50wt%
[Thickness] 150μm
[Adhesive] [Acrylic beads] 5wt%
[Thickness] 300 μm
[Throwing property] ○ Fracture at the interface [Retention time] More than 10,000 minutes Both throwing property and holding property are good

<< Example 1-4 >>
[Substrate] [EVA] 100 wt%
[SEBS] 100wt%
[Thickness] 150μm
[Adhesive] [Acrylic beads] 5wt%
[Thickness] 300 μm
[Throwing property] ○ Fracture at the interface [Retention time] 6300 minutes Throwing property is good, but retention property is reduced

<< Comparative Example 1-1 >>
[Substrate] [EVA] 100 wt%
[SEBS] None
[Thickness] 150μm
[Adhesive] [Acrylic beads] 5wt%
[Thickness] 300 μm
[Throwing property] × Throwing destruction [Retention time] 20 minutes

<< Comparative Example 1-2 >>
[Substrate] [EVA] None
[SEBS] 100wt%
[Thickness] 150μm
[Adhesive] [Acrylic beads] 5wt%
[Thickness] 300 μm
[Throwing property] ○ Interfacial fracture [Retention time] 50 minutes Throwing property is good, but retention property is considerably reduced.

  A summary of the results of the first example and the comparative example is shown in Table 1 below.

The following knowledge was obtained from Example 1 and its comparative example. That is,
-Addition of SEBS resin (synthetic rubber) to EVA resin improves anchorage and also improves retention.
-When the added amount of SEBS is 50% by weight, the anchoring property and the holding property are the best.
-Addition of at least 10% by weight of SEBS is preferable in order to improve anchoring property and holding property.
-A base material made of only EVA resin or synthetic rubber resin is poor in anchoring property and retaining property, and its anchoring property and retaining property are determined by the adhesive property.

[Adhesion test]
Next, the quality of the adhesive force (adhesiveness) between the stretched release tape and the adherend was determined. As the tape base material, the tape base material of [Example 1-3] ([EVA] 100 wt%, [SEBS] 50 wt%) which showed the best characteristics in the anchoring test was used. As pressure-sensitive adhesives, three types of pressure-sensitive adhesives with different addition amounts of acrylic beads were prepared according to Examples 2-1 to 2-3, and pressure-sensitive adhesives containing no acrylic beads were added as Comparative Example 2-1. A total of four types of each pressure-sensitive adhesive having a thickness of 300 μm was uniformly applied to both surfaces of the tape base material to prepare a stretch release tape.

As shown in FIG. 4 (b), each stretch-release tape was cut into a width of 15 × 100 mm, and a 25 μm PET (polyethylene terephthalate) film was bonded to both sides and left for 1 minute, and then the PET film 73 was applied to the surface. A peeling test (tensile speed: 300 mm / min) was performed at 180 ° (rightward in FIG. 4B), and the adhesive strength was measured. The adhesive strength at this time is called normal-state adhesive strength.
Next, the stretched release tape was cut into a width of 15 × length of 50 mm and stretched by 500%, and then a similar PET film was applied to both sides of the stretched release tape, and a peeling test was conducted by the same method. It was measured. The adhesive strength at this time is referred to as adhesive strength during stretching.
In addition, the copy paper was pasted on both sides of the unstretched stretch release tape, left to stand for 30 minutes, and then peeled off in the horizontal direction (180 °) with respect to the pasting surface to observe whether the copy paper could be peeled without tearing. . The evaluation results are shown below.

<< Example 2-1 >>
[Substrate] [EVA] 100 wt%
[SEBS] 50wt%
[Thickness] 150μm
[Adhesive] [Acrylic beads] 0.5wt%
[Thickness] 300 μm
[Normal adhesive strength] 13.6 N / 10 mm
[Adhesive strength during stretching] 2.2 N / 10 mm
[Copy paper condition] Can be peeled off neatly

<< Example 2-2 >>
[Substrate] [EVA] 100 wt%
[SEBS] 50wt%
[Thickness] 150μm
[Adhesive] [Acrylic beads] 1.0wt%
[Thickness] 300 μm
[Normal adhesive strength] 13.0N / 10mm
[Adhesive strength during stretching] 1.7 N / 10 mm
[Copy paper condition] Can be peeled off neatly

<< Example 2-3 >>
[Substrate] [EVA] 100 wt%
[SEBS] 50wt%
[Thickness] 150μm
[Adhesive] [Acrylic beads] 2.0wt%
[Thickness] 300 μm
[Normal Adhesive Strength] 9.0N / 10mm
[Adhesive strength during stretching] 0.6 N / 10 mm
[Copy paper condition] Can be peeled off neatly

<Comparative Example 2-1>
[Substrate] [EVA] 100 wt%
[SEBS] 50wt%
[Thickness] 150μm
[Adhesive] [Acrylic beads] None
[Thickness] 300 μm
[Normal adhesive strength] 15.5 N / 10 mm
[Adhesive strength during stretching] 9.9 N / 10 mm
[Copy paper condition] Torn

  A summary of the results of the second example and the comparative example is shown in Table 2 below.

The following findings were obtained from each Example 2 and the comparative example. That is,
-By blending acrylic beads with the adhesive, the adhesive strength during stretching is dramatically reduced. That is, it can be peeled off with a small force.
When the added amount of acrylic beads exceeds 2.0% by weight, fine irregularities are formed on the surface from the normal state, and thus the normal state adhesive force starts to decrease.

  As described above, according to the present invention, the tape base material is composed of a mixed composition of EVA (ethylene vinyl acetate copolymer) and synthetic rubber, whereby the stretchability of the tape base material is further improved, The followability of the interface at the time is improved and the anchoring property is improved, so that anchoring peeling does not easily occur between the base material and the adhesive.

  Furthermore, the pressure-sensitive adhesive used for the pressure-sensitive adhesive layer is a synthetic rubber system, and by blending the granular material with the pressure-sensitive adhesive, fine irregularities due to the granular material are formed on the surface of the pressure-sensitive adhesive layer that has become thin during stretching, The adhesion area with respect to the adherend surface is reduced, and it can be peeled off more reliably with a small force.

DESCRIPTION OF SYMBOLS 1 Stretching peeling tape 11 Tape base material 21,22 Adhesive layer 31,32 Separator 41,42 Holding part 5 Acrylic beads 6 To-be-adhered object W Wall surface

Claims (2)

A pressure-sensitive adhesive tape formed by forming a pressure-sensitive adhesive layer on one or both sides of a tape base material having rubber elasticity, by pulling the same pressure-sensitive adhesive tape attached to a surface to be bonded in a direction substantially parallel to the surface to be bonded In the stretch release tape that can be peeled off,
The tape base material is composed of a mixed composition of EVA (ethylene vinyl acetate copolymer) resin and synthetic rubber, and the rubber component is SEBS (styrene-ethylene-butylene-styrene block copolymer). (Ethylene-vinyl acetate copolymer) 10 to 100 parts by weight of blending release tape, wherein 100 parts by weight of resin is blended.   The stretch release tape according to claim 1, wherein the pressure-sensitive adhesive layer is made of a synthetic rubber-based pressure-sensitive adhesive.

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