JP2015172110A - Cushioning tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cushioning tape that can, without providing notches, suppress the occurrence of detachment or wrinkle when is attached to a curved surface or corner part, as a cushioning tape to be attached to the edge part or its periphery of a resin member to be incorporated.SOLUTION: Provided is a cushioning tape 1 that is to be attached to the edge part and its periphery of a resin member to be incorporated, during the incorporation and after the incorporation into a vehicle, formed by laminating an adhesive layer 12 onto one surface 11b of a foamed substrate 11.

Description

  The present invention relates to a shock-absorbing tape that is affixed to and around an edge portion of a resin member to be incorporated during and after incorporation into a vehicle.

Each vehicle such as an automobile has various interior parts formed by combining resin members, and a typical example of such interior parts is a front panel.
On the other hand, when these resin members are assembled at predetermined locations during vehicle manufacture, a buffer tape is affixed to the resin member to be incorporated, so that sliding at the contact portion between the buffer tape and another resin member to be incorporated is improved. May be easy to incorporate. In addition, the completed vehicle may generate a squeaking noise at the mounting portion of the resin member after mounting due to vibration during driving, etc. In order to reduce this squeaking noise, the edge portion of the mounting resin member and its surroundings A buffer tape may be attached to Usually, such a buffer tape is affixed to a place where a resin member is required at the time of manufacture of the vehicle, and remains affixed even after the vehicle is completed.

  As such a buffer tape, the thing of the structure by which the adhesive layer (adhesion layer) was laminated | stacked on the nonwoven fabric which is a base material which has a buffering effect | action is disclosed (for example, refer patent document 1).

JP 2000-104023 A

  However, the buffer tape described in Patent Document 1 has poor stretchability because the base material is a non-woven fabric, has low followability with respect to curved surfaces and corners, and the non-woven fabric becomes convex with respect to these parts. When a buffer tape is affixed, it is easy to peel off, and there is a problem that it becomes difficult to reduce the squeak noise after the resin member is incorporated or after the resin member is incorporated. In addition, this buffer tape has a problem that when the non-woven fabric is affixed to the curved surface portion and the corner portion, wrinkles are likely to occur in the non-woven fabric and it becomes difficult to incorporate the resin member. And in order to solve these problems, it is necessary to cut into the corresponding part of the buffer tape whose base material is a nonwoven fabric, but in that case, the work at the time of vehicle manufacture becomes complicated was there.

  The present invention has been made in view of the above circumstances, and as a buffer tape to be applied to the edge portion of the resin member to be incorporated and the periphery thereof, peeling off when applied to a curved surface portion or a corner portion without being cut. It is an object of the present invention to provide a buffer tape in which the generation of wrinkles is suppressed.

In order to solve the above-described problems, the present invention provides a buffer tape that is attached to and around an edge portion of a resin member to be incorporated at the time of assembling into a vehicle and after assembling, on one surface of a foamed substrate. A buffer tape, characterized in that a pressure-sensitive adhesive layer is laminated thereon.
In the cushioning tape of the present invention, in the foamed base material, pores extending in a direction from the non-laminated surface of the pressure-sensitive adhesive layer to the laminated surface are distributed in a cross section perpendicular to the non-laminated surface or the laminated surface. It is preferable.
In the buffer tape of the present invention, it is preferable that the pores penetrate from the non-laminated surface of the pressure-sensitive adhesive layer of the foamed base material to the laminated surface.

  According to the present invention, as a buffer tape to be applied to the edge portion of the resin member to be incorporated and its periphery, a buffer that suppresses the occurrence of peeling and wrinkles when applied to a curved surface portion or a corner portion without being cut. Tape is provided.

It is sectional drawing which illustrates typically the buffer tape of 1st Embodiment which concerns on this invention. It is a figure which illustrates typically the buffer tape of a 2nd embodiment concerning the present invention.

The shock-absorbing tape according to the present invention is a shock-absorbing tape that is affixed to the edge portion of the resin member to be incorporated and its periphery at the time of assembling into the vehicle and after the assembling, and is an adhesive on one surface of the foamed substrate. The layer is laminated.
When the vehicle such as an automobile is manufactured, the buffer tape is used by being attached to an edge portion of a resin member incorporated in the vehicle and a peripheral surface thereof.

When the foamed base material is slippery, the buffer tape improves the slip at the contact portion between the buffer tape and another resin member to be incorporated, and facilitates the incorporation. Moreover, since the said foaming base material has a buffering property because the said foaming base material has a void | hole (foaming) part, after the vehicle manufacture (after integration), it is affixed as it is, and the resin member of Reduces squeak noise caused by vibration during running in the built-in part.
As described above, the buffer tape reduces problems such as rubbing, scratching, and generation of squeaking noises at the resin member assembly.

  Moreover, the said buffer tape has a drawability because the said foaming base material has a void | hole (foaming) part. Therefore, the buffer tape is excellent in followability to convex curved surface portions and corner portions on the basis of the stretchability, and even when not cut, peeling when applied to these portions is suppressed. Moreover, even when the buffer tape is applied to the concave curved surface portion and the corner portion based on the stretchability and the buffer property of the foamed base material, the deformation is absorbed, and wrinkles are generated without making a cut. It is suppressed.

The material of the resin member to which the buffer tape is applied is not particularly limited and can be arbitrarily selected according to the purpose. Preferred examples include synthetic resins such as polypropylene and polycarbonate / ABS resin alloy, and melamine resin paint (alkyd resin). -The member painted with resin paints, such as a melamine resin paint), can be illustrated.
As the resin member, an interior member of a vehicle is suitable.
Hereinafter, the present invention will be described in detail with reference to the drawings.

<First Embodiment>
FIG. 1 is a cross-sectional view schematically illustrating the buffer tape according to the first embodiment of the invention.
The buffer tape 1 shown here is formed by laminating an adhesive layer 12 and a release material 13 in this order on one surface 11 b of a foam substrate 11.
The foamed substrate 11 has, as main surfaces, the one surface, that is, the laminated surface (back surface) 11b of the pressure-sensitive adhesive layer 12, and the other surface, that is, the non-laminated surface (front surface) 11a of the pressure-sensitive adhesive layer 12. The non-laminated surface 11a serves as a contact surface with a member to be incorporated.

The foamed base material 11 is a resin base material having a large number of bubbles (hole portions, not shown) inside, and the surface is an uneven surface. And since the surface (especially the said non-lamination surface 11a) is an uneven surface, the foaming base material 11 has a small frictional force with another member, and its slipperiness is high.
The foamed base material 11 may be a known one, and may be, for example, a closed-cell foamed base material in which bubbles are present independently of each other, or an open-cell foamed base material in which bubbles are fused with each other. It may be a foamed base material in which bubbles and bubbles fused with each other are mixed.

  Examples of the resin constituting the foam base 11 include synthetic resins such as polyethylene, polystyrene, ethylene-vinyl acetate copolymer (EVA), and ethylene-propylene copolymer.

The foaming base material 11 preferably has a foaming ratio of 2 to 50 times, and more preferably 5 to 20 times. When the expansion ratio is equal to or higher than the lower limit value, the effect of suppressing peeling and wrinkle generation of the buffer tape 1 attached to the curved surface portion or the corner portion is further increased. Moreover, the intensity | strength of the foaming base material 11 improves more because the said expansion ratio is below the said upper limit.
In the present specification, the “foaming ratio” means the ratio of the volume of the foam material to the volume of the non-foam material ([non-foam material and Volume of foamed material of the same mass] / [volume of non-foamed material]).

  The thickness of the foamed substrate 11 is preferably 100 to 5000 μm, and more preferably 200 to 2000 μm.

  The pressure-sensitive adhesive layer 12 may be a known one, for example, one that is usually used in the field of pressure-sensitive adhesive tapes. Specific examples of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 include acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, polyurethane-based pressure-sensitive adhesives, and polyester-based pressure-sensitive adhesives. These pressure-sensitive adhesives may be any of emulsion type, solvent type and solventless type.

The pressure-sensitive adhesive is preferably an acrylic pressure-sensitive adhesive from the viewpoint of weather resistance and the like.
The pressure-sensitive adhesive layer 12 formed using the acrylic pressure-sensitive adhesive preferably contains an acrylic resin having a weight average molecular weight of 300,000 to 2,000,000, more preferably 500,000 to 1,500,000, and is crosslinked. A layer made of an adhesive is suitable. When the weight average molecular weight is in such a range, the buffer tape 1 having an excellent balance between adhesive force and holding force can be obtained.
Here, the “weight average molecular weight” is a value in terms of polystyrene measured by a gel permeation chromatography (GPC) method.

  As said acrylic resin which the adhesive layer 12 contains, a (meth) acrylic acid ester-type copolymer can be illustrated. Moreover, as a preferable thing in this (meth) acrylic acid ester-type copolymer, the C1-C20 (meth) acrylic-acid alkylester with the alkyl group, the monomer containing the functional group which has active hydrogen, A copolymer with other monomers that are optionally used can be exemplified. In this specification, “(meth) acrylic acid” is a concept including both “acrylic acid” and “methacrylic acid”.

Examples of the alkyl group having 1 to 20 carbon atoms in the alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, ( Pentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, Examples thereof include myristyl (meth) acrylate, palmityl (meth) acrylate, and stearyl (meth) acrylate.
In the (meth) acrylic acid ester-based copolymer, the alkyl group having 1 to 20 carbon atoms in the alkyl group may be one kind or two or more kinds.

Examples of the monomer containing a functional group having active hydrogen include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and (meth) acrylic acid. Hydroxyl group-containing monomers such as 2-hydroxybutyl, (meth) acrylic acid 3-hydroxybutyl and (meth) acrylic acid hydroxyalkyl esters such as 4-hydroxybutyl; acrylamide, methacrylamide, N-methylacrylamide Amide group-containing monomers such as N-methylmethacrylamide, N-methylolacrylamide, N-methylolmethacrylamide; monomethylaminoethyl (meth) acrylate, monoethylaminoethyl (meth) acrylate, monomethylamino (meth) acrylate Professional , Monoalkylaminoalkyl (meth) acrylates such as monoethylaminopropyl (meth) acrylate; carboxyls having ethylenically unsaturated bonds such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, citraconic acid An acid etc. can be illustrated.
The said monomer containing the functional group which has active hydrogen in the said (meth) acrylic-ester type copolymer may be only 1 type, and 2 or more types may be sufficient as it.

Examples of the other monomer used optionally include vinyl esters such as vinyl acetate and vinyl propionate; olefins such as ethylene, propylene and isobutylene; halogenated olefins such as vinyl chloride and vinylidene chloride; styrene and α-methylstyrene. Styrene monomer such as butadiene monomer, diene monomer such as isoprene and chloroprene, nitrile monomer such as acrylonitrile and methacrylonitrile, N, N-dimethylacrylamide, N, N-dimethylmethacrylamide, etc. Examples thereof include N, N-dialkyl-substituted acrylamide.
The other monomer used optionally in the (meth) acrylic acid ester copolymer may be one kind or two or more kinds.

  The copolymerization form of the (meth) acrylic acid ester copolymer is not particularly limited, and any of a random copolymer, a block copolymer, and a graft copolymer may be used.

  The acrylic resin such as the (meth) acrylic acid ester copolymer contained in the pressure-sensitive adhesive layer 12 may be one kind or two or more kinds.

The acrylic pressure-sensitive adhesive is preferably subjected to a crosslinking treatment, and the crosslinking agent used for the crosslinking treatment is not particularly limited and may be a known one.
Examples of the crosslinking agent include polyisocyanate compounds, epoxy compounds, melamine resins, urea resins, dialdehydes, methylol polymers, metal chelate compounds, metal alkoxides, metal salts and the like, and polyisocyanate compounds and epoxy compounds are preferred.
The cross-linking agents may be used alone or in combination of two or more.
Although the usage-amount of the said crosslinking agent is based also on the kind, Preferably it is 0.01-20 mass parts with respect to 100 mass parts of said (meth) acrylic acid ester-type copolymers, More preferably, it is 0.1-0.1. It is selected in the range of 10 parts by mass.

  The acrylic pressure-sensitive adhesive may contain other components such as a tackifier, an antioxidant, an ultraviolet absorber, a light stabilizer, a softener, a silane coupling agent, and a filler as necessary. These other components may be used alone or in combination of two or more.

  The thickness of the pressure-sensitive adhesive layer 12 is preferably 10 to 100 μm, and more preferably 20 to 50 μm.

  The release material 13 may be a known material, for example, one that is usually used in the field of adhesive tape. Examples of preferable release material 13 include those in which a release layer is provided on the surface of a paper substrate or a film substrate.

Examples of the paper substrate include various paper materials such as polyethylene laminated paper, polypropylene laminated paper, clay coated paper, resin coated paper, glassine paper, and high quality paper.
Examples of the film substrate include various resin films such as polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, and polyacrylate.
Examples of the release material 13 include a synthetic paper or film in which a filler such as a filler is contained in the paper base or film base. If necessary, a release layer is formed on the surface of the synthetic paper or film. It may be provided.
Examples of the release layer include those containing release agents such as silicone resins, long-chain alkyl resins, and fluorine resins.

  The thickness of the release material 13 is not particularly limited, and may be adjusted as appropriate.

In addition to having the above-described stretchability and buffering property, the buffer tape 1 does not generate fiber waste because it is not a non-woven fabric, and it is difficult to permeate water vapor and the like due to its high airtightness. Corrosion of the member is suppressed.
In addition, the buffer tape 1 can be formed in a roll form, and can be pasted by using a sticking device with an arbitrary width and length, and an extra operation such as making a cut is unnecessary, so that workability is also improved. Excellent.

The buffer tape 1 can be manufactured by laminating the pressure-sensitive adhesive layer 12 and the release material 13 on the laminated surface 11b of the foamed base material 11 in this order.
The pressure-sensitive adhesive layer 12 can be formed by applying a composition for forming a pressure-sensitive adhesive layer to the laminated surface 11 b of the foamed substrate 11 and drying it. Alternatively, the pressure-sensitive adhesive layer 12 can also be formed by applying the pressure-sensitive adhesive layer-forming composition to the surface of the release layer of the release material and drying the pressure-sensitive adhesive layer formed on the surface of the foam substrate 11. . In this case, when the above-described release material 13 is used as the release material, it is not necessary to remove the release material 13 and the buffer tape 1 is obtained immediately. However, when a release material other than the release material 13 is used, Remove this release material.
The drying conditions of the pressure-sensitive adhesive layer forming composition are not particularly limited, but the temperature is preferably 70 to 130 ° C., and the time is preferably 1 to 5 minutes.

Examples of the pressure-sensitive adhesive layer forming composition include those in which the pressure-sensitive adhesive and the solvent constituting the pressure-sensitive adhesive layer 12 are blended.
Examples of the solvent include esters such as ethyl acetate and butyl acetate; ketones such as methyl isobutyl ketone, methyl ethyl ketone and cyclohexanone; aromatic hydrocarbons such as toluene and xylene.

  Application of the pressure-sensitive adhesive layer forming composition to the foamed substrate 11 or the release material may be performed by a known method, such as an air knife coater, blade coater, bar coater, gravure coater, roll coater, roll knife coater, curtain coater. Examples thereof include methods using various coaters such as a die coater, a knife coater, a screen coater, a Meyer bar coater, and a kiss coater.

The application amount of the pressure-sensitive adhesive layer forming composition to the foamed base material 11 or the release material may be adjusted as appropriate, but the application amount of the pressure-sensitive adhesive is preferably ²⁰ to 50 g / m ² .

  After the pressure-sensitive adhesive layer 12 is formed, if the release material 13 is not provided, it may be bonded onto the pressure-sensitive adhesive layer 12. For example, the release material 13 is applied to the surface of a paper substrate or a film substrate. When the release layer is provided, the release material 13 may be bonded to the pressure-sensitive adhesive layer 12 so that the release layer is brought into contact with the pressure-sensitive adhesive layer 12. Thereby, the buffer tape 1 is obtained.

  In each of the above steps, the foamed base material 11 or the foamed base material 11 on which the pressure-sensitive adhesive layer 12 or the like is formed is rolled out from the rolled state, and any layer is further formed. After the formation, the buffer tape 1 can be manufactured by a so-called roll-to-roll method in which the film is further wound into a roll.

Second Embodiment
FIG. 2 is a diagram schematically illustrating a buffer tape according to a second embodiment of the present invention, in which (a) is a cross-sectional view and (b) is a front view as seen from the foamed substrate side. 2 that are the same as those shown in FIG. 1 are assigned the same reference numerals as in FIG. 1, and detailed descriptions thereof are omitted.

The shock-absorbing tape 2 shown here is the same as the shock-absorbing tape 1 shown in FIG. 1 except that it has a foamed base material 21 having pores 24 instead of the foamed base material 11.
Since the buffer tape 2 is provided with the pores 24, the buffer tape 2 is more excellent in followability to curved surfaces and corners than the buffer tape 1.
Further, when the buffer tape 2 is one in which the pores 24 are opened in the non-laminate surface 21 a of the pressure-sensitive adhesive layer 12 of the foam base material 21, the non-laminate surface 21 a is more than the surface of the foam base material 11. Furthermore, since the degree of unevenness is large, the frictional force with other members is smaller and the slipperiness is higher.

The foam base 21 is the same as the foam base 11 in the buffer tape 1 except that a large number of pores 24 are provided.
The pore 24 extends from the non-laminated surface (front surface) 21a of the pressure-sensitive adhesive layer 12 of the foamed base material 21 to the laminated surface (back surface) 21b of the pressure-sensitive adhesive layer 12 of the foamed base material 21. The fine pores 24 are distributed in a cross section perpendicular to the non-laminated surface 21 a or the laminated surface 21 b in the foamed base material 21.

In addition, the pores 24 are distributed in the non-laminated surface 21a or the laminated surface 21b or a cross section parallel to these surfaces in the foam substrate 21, and the number of pores 24 on these surfaces is not particularly limited, but is preferably 1 to 100 / cm ^2, more preferably 2 to 50 / cm ^2. When the number of the pores 24 is equal to or greater than the lower limit, the effect of providing the pores 24 is more remarkably obtained. When the number of the pores 24 is equal to or less than the upper limit, foaming is performed. The strength of the base material 21 is further improved.

  The shape of the cross section of the pore 24 in the direction orthogonal to the extending direction (the direction from the non-laminated surface 21a to the laminated surface 21b) is a circle. However, other shapes may be used.

The maximum diameter (diameter of the circle in FIG. 2) D ₁ of the cross-sectional shape of the pore 24 is not particularly limited and may be adjusted as appropriate, but may be ₁ to 40 with respect to the thickness H ₁ of the foam base 21. % Is preferable, and 5 to 20% is more preferable. Here, the “maximum diameter” means the longest line segment connecting two points on the wall surface of the pore 24 in the cross-sectional shape.

The non-laminated surface 21a or laminated surface 21b, or in a cross section parallel to these surfaces, the distance _{L 1} between the pore portions 24 adjacent 0.1-20 thickness _{H 1} of the foaming base material 21 It is preferable that it is double, and it is more preferable that it is 1 to 5 times. Here, the “distance between adjacent pores 24” is a line segment connecting a point on the wall surface of one adjacent pore 24 and a point on the wall surface of the other pore 24. Means the shortest.
Further, in the surface, the distance L ₁ is may be a same all across the pore portions 24 to each other, may be different all, may be the same part only.

  Here, the pores 24 are shown as penetrating through the foamed base material 21 from the non-laminated surface 21a of the pressure-sensitive adhesive layer 12 of the foamed base material 21 to the laminated surface 21b of the pressure-sensitive adhesive layer 12. However, in the present invention, the pores 24 do not have to penetrate the foamed base material 21, and for example, the pores 24 do not have to be opened in the non-laminated surface 21a or the laminated surface 21b. .

  In the buffer tape 2, all the pores 24 may not be the same, and, for example, the cross-sectional shape, the maximum diameter in the cross-sectional shape, the length, and the like may be mixed.

  The buffer tape 2 can be manufactured by the same method as the buffer tape 1 except that the foam substrate 21 is used instead of the foam substrate 11. The buffer tape 2 having the pores 24 opened on the non-laminated surface 21a of the pressure-sensitive adhesive layer 12 of the foam substrate 21 is obtained by obtaining the buffer tape 1 by the method described above, and then the foam substrate 11 It can also be manufactured by forming the pores 24 in the foamed base material 21.

The foam base 21 is obtained by forming the pores 24 with respect to the foam base having no pores 24 such as the foam base 11.
The pore 24 can be formed by, for example, a method of inserting a heated needle-like structure, a method of irradiating a laser, a method of spraying high-pressure water, or the like on a foam base material to be formed. In view of efficient formation, a method of inserting a heated needle-like structure is preferable.

  The buffer tape according to the present invention is not limited to the one shown in FIGS. 1 and 2, and a part of the configuration may be appropriately changed, omitted, or added within a range not impairing the effects of the present invention.

  The shock-absorbing tape according to the present invention is highly slippery on the foamed base as described above. For example, the surface roughness (arithmetic average roughness) of the foamed base conforming to “JIS B0601: 2013 4.2.1”. Ra) is preferably 0.05 μm or more, and more preferably 0.07 μm or more. On the other hand, the upper limit of the surface roughness of the foamed substrate is not particularly limited as long as the effect of the present invention is not impaired. In addition, the dynamic friction force of the foamed base material to the resin member in accordance with “JIS K7125: 1999” is preferably 18 N or less, and more preferably 14 N or less.

The buffer tape according to the present invention has stretchability as described above. For example, the buffer tape having a width of 15 mm is stretched in the flow direction (MD direction) and preferably has a breaking strength of 5 N / 15 mm. As described above, more preferably, it is 10 N / 15 mm or more, and the elongation at break is preferably 40% or more, more preferably 60% or more.
The buffer tape according to the present invention preferably has a residual stress of 10 N / 15 mm or less after 1 minute after stretching a buffer tape having a width of 15 mm by 20% in the flow direction (MD direction), for example, 8N / 15 mm or less is more preferable.
These physical properties at the time of stretching are a measure of the effect of suppressing peeling when the buffer tape is applied to convex curved surface portions and corner portions, and the effect of suppressing the occurrence of wrinkles when applied to concave curved surface portions and corner portions. Is.

  Moreover, it is preferable that the compression stress at the time of 25% compression of the foaming base material of the buffer tape concerning this invention based on "JISK7181" is 0.1 MPa or less. With such a compressive stress, it is possible to further reduce problems such as rubbing, scratching, and generation of squeaking noise at the resin member assembly portion.

Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the present invention is not limited to the following examples.
In addition, each characteristic of the buffer tape in an Example and a comparative example was measured and evaluated with the following method.

(Surface roughness)
The surface roughness (arithmetic mean roughness Ra, μm) of the buffer layer (foamed substrate, nonwoven fabric) was measured in accordance with “JIS B0601: 2013 4.2.1”.
(Dynamic frictional force)
The dynamic friction force (N) of the buffer layer (foamed substrate, non-woven fabric) against the polypropylene plate (PP (Kobe Poly Sheet) model number PP-N-BN) is based on “JIS K7125: 1999” and the surface load is 1 kgf (9. 80665N), and the test speed was 10 mm / min.
(Residual stress)
Residual stress (N / 15mm) when buffer tape with a width of 15mm is stretched 20% in the flow direction (MD direction) is measured immediately after stretching and at 1 minute, 5 minutes and 10 minutes after stretching to relieve stress. Evaluated.
(Tensile properties)
Stretching a buffer tape with a width of 15 mm in the flow direction (MD direction), as tensile properties, the strength when the buffer tape breaks (breaking strength, N / 15 mm) and the elongation of the buffer tape (breaking elongation,%) And were measured respectively.
(Compressive stress)
The compressive stress of the buffer layer (foamed substrate, non-woven fabric) was measured in accordance with “JIS K7181”.

[Example 1]
A buffer tape having the structure shown in FIG. 1 was produced.
As the foam base material, a black base material (“Bora La XL-S # 1501” manufactured by Sekisui Chemical Co., Ltd.) having polyethylene as a main component, a thickness of 1.0 mm, and a foaming ratio of 15 times was used. The pressure-sensitive adhesive layer was made of an acrylic pressure-sensitive adhesive and had a thickness of 40 μm, and the amount of pressure-sensitive adhesive applied was 39 g / m ² . As the release material, release paper “SP-7LK Shiro” (manufactured by Lintec Corporation) was used.
The evaluation results of the obtained buffer tape are shown in Table 1.

[Example 2]
A buffer tape having the structure shown in FIG. 2 was produced.
That is, in place of the foamed base material used in Example 1 instead of the foamed base material used in Example 1, the one provided with a pore portion penetrating in the thickness direction as described below was used. A buffer tape was manufactured in the same manner as in Example 1. The pores were formed by pressing a hot needle roll having a predetermined size and spacing against the foamed substrate.
Number of pores: 25 / cm ²
Maximum diameter D ₁ in the cross-sectional shape of the pores: 100 μm
Distance L ₁ between adjacent pores: 2 mm
The evaluation results of the obtained buffer tape are shown in Table 1.

[Example 3]
A buffer tape having the configuration shown in FIG. 1 was produced in the same manner as in Example 1 except that a foamed substrate having a thickness of 0.5 mm and a foaming ratio of 7 was used.
The evaluation results of the obtained buffer tape are shown in Table 1.

[Comparative Example 1]
A buffer tape was manufactured in the same manner as in Example 1 except that a nonwoven fabric substrate made of polyethylene and having a thickness of 1.0 mm was used instead of the foamed substrate, and the release material was not laminated.
The evaluation results of the obtained buffer tape are shown in Table 1.

As shown in Table 1, the buffer tapes of Examples 1 to 3 had small kinetic frictional force and high slipperiness. Moreover, the residual stress at the time of 20% stretching was low in each stage, and particularly low in Example 3. The buffer tape of Example 2 had a lower residual stress than the buffer tape of Example 1 because the pores were provided in the base material. In addition, the tensile properties were sufficiently large for the buffer tapes of Examples 1 to 3 in both breaking strength and breaking elongation, particularly in Example 3. As described above, the buffer tapes of Examples 1 to 3 are highly slippery when attached to the edge portion of the resin member to be incorporated and its periphery at the time of assembling into the vehicle and after the assembling. As is clear from the evaluation results of residual stress and tensile properties at% stretching, it has sufficient performance to suppress the occurrence of peeling and wrinkles when applied to curved surfaces or corners, even if not cut. In particular, the buffer tape of Example 3 was excellent. Furthermore, since the base material of the buffer tapes of Examples 1 to 3 was not a nonwoven fabric, generation of dust such as fiber scraps was suppressed during cutting and use. And since the buffer tape of Examples 1-3 has a low compressive stress, it can adapt flexibly to the joint part of the resin members which have a tertiary curved surface after incorporation in a vehicle, and is effective in reducing the interference of the resin members Met.
On the other hand, the buffer tape of Comparative Example 1 was poor in stretchability, and the residual stress at 20% stretching could not be measured and was difficult to handle. Moreover, since the base material was a nonwoven fabric, the buffer tape of the comparative example 1 generate | occur | produced the fiber waste at the time of cutting and use.

  The present invention can be used as a buffer tape to be affixed to a resin member when a vehicle is manufactured.

DESCRIPTION OF SYMBOLS 1, 2 ... Buffer tape, 11, 21 ... Foaming base material, 11a ... The surface of a foaming base material (non-lamination surface of an adhesive layer), 11b ... The back surface of a foaming base material (adhesive) Layer laminated surface), 21a... Surface of foamed substrate (non-laminated surface of adhesive layer), 21b .. back surface of foamed substrate (laminated surface of adhesive layer), 12... , 13 ... release material, 24 ... pore part, D ₁ ... maximum diameter in the cross-sectional shape of the pore part, H ₁ ... thickness of the foamed substrate, L ₁ ... adjacent to each other Distance between pores

Claims (3)

A buffer tape that is attached to and around the edge portion of the resin member to be incorporated at the time of incorporation into the vehicle and after incorporation,
A buffer tape comprising an adhesive layer laminated on one surface of a foam substrate.   In the foamed base material, the pores extending in the direction from the non-laminated surface to the laminated surface of the pressure-sensitive adhesive layer are distributed in a cross section perpendicular to the non-laminated surface or the laminated surface. The buffer tape according to claim 1.   The buffer tape according to claim 2, wherein the pores penetrate from the non-laminated surface of the pressure-sensitive adhesive layer of the foamed base material to the laminated surface.

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