JP2003020458A - Adhesive tape substrate and adhesive tape using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive tape substrate having nearly same tensile strength, impact resistance and following property as those of a filament- reinforced adhesive tape and an adhesive tape using the substrate. SOLUTION: This adhesive tape 7 is prepared by providing a tacky agent layer 5 on either one surface of an adhesive tape substrate 6 obtained by laminating a film 2 to a film 4 with an adhesive layer 3 containing a heat- expandable microcapsule and providing a releasing agent layer 1 on a surface on the opposite side to the surface on which the tacky agent 5 of the adhesive tape substrate 6 is provided.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an adhesive tape substrate and an adhesive tape using the same.

[0002]

2. Description of the Related Art Conventionally, filament-reinforced adhesive tapes have been widely used for binding and packing heavy materials such as steel materials and pipes. Filament reinforced adhesive tape has a structure in which polyester fibers or glass fibers are aligned on a film base material such as polyester, and an adhesive layer such as natural rubber is provided on top of it, so the tape strength is extremely high and impact resistance is also high. Are better. Therefore, the filament reinforced adhesive tape is mainly used for bundling and packing heavy materials such as steel materials and pipes, but also for re-peeling applications such as fixing parts for refrigerators, printers, personal computers, etc. Is also used (Japanese Patent Laid-Open No. 49-9550).
"Adhesive Handbook (2nd edition)" p398 Japan Adhesive Tape Manufacturers Association 1995.10).

[0003]

However, since the filament-reinforced pressure-sensitive adhesive tape is expensive because it has the above-mentioned structure, in some applications, as an alternative to the filament-reinforced pressure-sensitive adhesive tape, a polyester film base material is used. Polyester adhesive tape with an adhesive layer of natural rubber or the like on top is used, but if you try to give the same strength as the filament-reinforced adhesive tape with a polyester adhesive tape, the base material of the polyester adhesive tape will be There was a problem that it became thicker and the flexibility of the tape disappeared ("Adhesive Handbook (2nd edition)" p400 Japan Adhesive Tape Industry Association 1995.10).

Therefore, there has been a demand for an inexpensive adhesive tape which has a tape strength comparable to that of the filament-reinforced adhesive tape and which is also supple to follow the shape of the adherend.

The present invention relates to an adhesive tape base material having the same tensile strength, impact resistance and followability as a filament reinforced adhesive tape as an adhesive tape for binding and packing steel materials, pipes and the like, and an adhesive using the same. The purpose is to provide the tape at a low cost.

[0006]

In order to solve the above-mentioned object, the present invention has the structure described in the claims.

That is, the pressure-sensitive adhesive tape base material of the present invention is 2
A pressure-sensitive adhesive tape substrate obtained by laminating a plurality of plastic films with an adhesive, wherein the adhesive contains heat-expandable microcapsules.

In this case, the thickness of the plastic film is 0.012 to 0.075 mm.

Further, in this case, the adhesive is an adhesive containing at least one rubber selected from natural rubber, polyisoprene rubber, styrene / butadiene / styrene rubber and styrene / isoprene / styrene rubber as a main component. To do.

In the adhesive tape of the present invention, an adhesive layer is provided on one surface of the adhesive tape substrate, and the surface of the adhesive tape substrate opposite to the surface on which the adhesive layer is provided. The structure has a release agent layer.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an adhesive tape 7 according to the present invention.
It is a schematic sectional drawing which shows. As shown in the figure, a pressure-sensitive adhesive layer 5 is provided on one surface of a pressure-sensitive adhesive tape substrate 6 obtained by bonding a film 2 and a film 4 with an adhesive layer 3 made of an adhesive containing heat-expandable microcapsules. The release agent layer 1 is provided on the surface of the adhesive tape substrate 6 opposite to the surface on which the adhesive layer 5 is provided.

The film 2 and the film 4 are made of cellophane, acetate having a thickness of 0.012 to 0.075 mm,
Use plastic films such as polyvinyl chloride, polyethylene, polypropylene, polyester, polytetrafluoroethylene, polyimide, polycarbonate and polystyrene.

The thickness of film 2 and film 4 is 0.01
When it is less than 2 mm, the strength of the adhesive tape 7 is much lower than that of the filament-reinforced adhesive tape, and when it is more than 0.075 mm, the followability is poor and a problem occurs.

The strength of the films 2 and 4 is preferably such that the tensile strength is 100 to 400 N / 10 mm and the elongation is 50 to 150%. When the tensile strength is less than 100 N / 10 mm, the tape strength is much lower than the filament-reinforced adhesive tape and the elongation is 50%.
If it is less than the following range, the followability is poor.

The adhesive of the adhesive layer 3 is mainly composed of at least one rubber selected from natural rubber, polyisoprene rubber, styrene-butadiene-styrene rubber (SBS) and styrene-isoprene-styrene rubber (SIS). An adhesive as a component, which contains thermally expandable microcapsules inside the adhesive. Therefore, the adhesive layer 3
Has excellent impact resistance.

The thickness of the adhesive layer 3 is 0.010 to
When the thickness of the adhesive layer 3 is less than 0.010 mm, the adhesive force and elasticity are insufficient, and when it exceeds 0.100 mm, delamination or adhesion between the film 2 and the film 4 occurs. This is not preferable because there is a possibility that cohesive failure of the agent layer 3 may occur.

The above-mentioned heat-expandable microcapsules are heat-expandable microcapsules in which a hydrocarbon is contained in a thermoplastic resin shell such as vinylidene chloride or acrylonitrile, and the size thereof is about 0.010 to 0.040 mm in diameter.
And is easily dispersed in the adhesive.

The heat-expandable microcapsules are added in an amount of 0.1 to 5.0 parts with respect to 100 parts by weight of the adhesive. When the addition amount is less than 0.1 part, the followability and impact resistance are deteriorated, and when the addition amount is 5.0 parts or more, the film 2
And the bonding force of the film 4 is hindered.

As described above, the pressure-sensitive adhesive tape substrate 6 of the present invention has a structure in which the adhesive layer 3 having elasticity is provided between the film 2 and the film 4, so that the conventional adhesive tape substrate 6 which is not bonded is used. Compared to a film substrate (having the same film thickness as the laminated substrate), it has excellent tensile strength, elongation, followability and impact resistance.

The pressure-sensitive adhesive tape 7 has the pressure-sensitive adhesive layer 5 on one surface of the pressure-sensitive adhesive tape substrate 6, and the release agent layer 1 on the surface of the pressure-sensitive adhesive tape substrate 6 opposite to the surface on which the pressure-sensitive adhesive layer 5 is provided. Since the structure is provided, when the rolled adhesive tape 7 is rewound, the adhesive tape base material 6 does not cause interlayer cracks and the adhesive tape 7 can be easily unraveled.

The adhesive layer 5 includes natural rubber, polyisoprene rubber, styrene / butadiene / styrene rubber (SB).
S), styrene / isoprene / styrene rubber (SI
An adhesive containing at least one rubber selected from S), butyl rubber, an acrylic ester copolymer and silicone rubber as a main component is mainly used.

The thickness of the adhesive layer 5 is 0.01
The range of 0 to 0.050 mm is desirable, and when the thickness of the pressure-sensitive adhesive layer 5 is less than 0.010 mm, the adhesive strength is insufficient,
If it exceeds 0.050 mm, cohesive failure or the like may occur, which may cause adhesive residue on the adherend, and is expensive, which is not preferable.

[0023]

EXAMPLES The present invention will now be described in more detail with reference to examples. However, the scope of the present invention is not limited to these examples.

Example 1 100 parts by weight of a rubber-based adhesive composed of natural rubber, tacky fire and synthetic rubber was thermally expanded with a diameter of about 0.020 mm in which a shell made of vinylidene chloride resin contains a hydrocarbon. Microcapsules (“Matsumoto Microsphere F Series” manufactured by Matsumoto Yushi-Seiyaku Co., Ltd.) were dispersed in an amount of 5 parts by weight to prepare an adhesive. The above adhesive is coated on a 0.038 mm thick polyester film to a thickness of 0.030 mm,
A 0.038 mm-thick polyester film was attached to the upper surface thereof to prepare an adhesive tape base material. Next, a release agent is applied to the surface of one of the polyester films, and a pressure-sensitive adhesive containing natural rubber as a main component is applied to the surface of the polyester film opposite to the surface provided with the release agent layer with a thickness of about 0.0
A pressure-sensitive adhesive tape was produced by coating so as to have a thickness of 30 mm.

[Comparative Example 1] A release agent was applied to one side of a polyester film substrate having a thickness of 0.075 mm, and natural rubber was mainly applied to the side opposite to the side provided with the release agent layer. A pressure-sensitive adhesive as a component was applied to a paste thickness of about 0.030 mm to prepare a polyester pressure-sensitive adhesive tape.

[Comparative Example 2] A release agent is applied to one surface of a 0.019 mm-thick polyester film base material, and filamenta fiber is drawn to the surface opposite to the surface provided with the release agent layer. The filaments were aligned, and an adhesive containing natural rubber as a main component was applied to the upper layer so as to have a paste thickness of about 0.030 mm to produce a filament-reinforced adhesive tape.

[Example 2] In producing an adhesive tape substrate, a polyester film having a thickness of 0.012 mm was used in place of the polyester film having a thickness of 0.038 mm, and adhesion was performed in the same manner as in Example 1. A tape base material was prepared and used to prepare an adhesive tape.

[Example 3] In producing an adhesive tape substrate, a polyester film having a thickness of 0.075 mm was used instead of the polyester film having a thickness of 0.038 mm, and adhesion was performed in the same manner as in Example 1. A tape base material was prepared and used to prepare an adhesive tape.

Table 1 shows the characteristics of the pressure-sensitive adhesive tapes used in Examples 1, 2 and 3, Comparative Example 1 and Comparative Example 2. The measuring conditions of the adhesive force, tack, holding force, tensile strength and rewinding force are in accordance with JIS-Z-0237. The adhesive force indicates the adhesive force to the stainless steel plate, and the tack is the ball No. in the ball tack. Indicates. The holding power is
Attach the adhesive tape to the stainless steel plate, and at the temperature of 40 ℃,
Time to drop when load is 1000g or 24
Measure the time lag. Tensile strength is 25 mm wide,
The tensile strength and elongation of the adhesive tape cut to a length of 125 mm are shown.

[0030]

【table 1】 As is clear from Table 1, the adhesive tape substrate of the present invention has 2
Since the structure is made by laminating a plurality of plastic films, the substantial film thickness of the adhesive tape base materials of Example 1 and Comparative Example 1 does not change. However, the pressure-sensitive adhesive tape of Example 1 exhibits superior properties in tensile strength and elongation as compared with the polyester pressure-sensitive adhesive tape of Comparative Example 1. In this case, a large elongation indicates excellent followability.

The pressure-sensitive adhesive tape of Example 1 was the same as Comparative Example 2
Although the tensile strength is inferior to that of the filament-reinforced pressure-sensitive adhesive tape of No. 1, it is inexpensive and has excellent elongation, and therefore has excellent followability and impact resistance.

[0032]

As described above, the pressure-sensitive adhesive tape base material of the present invention is a pressure-sensitive adhesive tape base material obtained by bonding two plastic films together with an adhesive, and the adhesive is a heat-expandable microcapsule. Since it is an adhesive in which is dispersed, it is inexpensive and has excellent tensile strength, elongation, followability and impact resistance.

In this case, since the thickness of the plastic film is 0.012 to 0.075 mm, the tensile strength, elongation and followability are excellent.

Further, since the adhesive is an adhesive containing at least one rubber selected from natural rubber, polyisoprene rubber, styrene / butadiene / styrene rubber and styrene / isoprene / styrene rubber as a main component, Has excellent impact resistance.

The heat-expandable microcapsules are
Since it is a heat-expandable microcapsule containing a hydrocarbon in a thermoplastic shell such as vinylidene chloride or acrylonitrile, it is easily dispersed in the adhesive.

The pressure-sensitive adhesive tape of the present invention has a pressure-sensitive adhesive layer provided on one surface of the pressure-sensitive adhesive tape base material, and a release agent on the surface of the pressure-sensitive adhesive tape base material opposite to the surface provided with the pressure-sensitive adhesive layer. Since the structure is provided with layers, when the rolled adhesive tape is rewound, the adhesive tape base material does not cause interlayer cracks and the adhesive tape can be easily unraveled.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an adhesive tape 7 according to the present invention.

[Explanation of symbols]

1 ... Release agent layer, 2 ... Film, 3 ... Adhesive layer, 4 ... Film, 5 ... Adhesive layer, 6 ... Adhesive tape base material, 7 ... Adhesive tape

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 4F100 AK01A AK01B AK16 AK28C                       AK28H AK41 AK73C AK73H                       AN00C AN00H AR00C BA02                       BA03 BA06 BA07 BA10A                       BA10B DE04C DJ04C EH46                       EH462 GB15 JK02 JK08                       JK10 JK10C JK17 JL14                       YY00A YY00B                 4J004 AA04 AA05 AA06 AA10 AB01                       AC01 CA02 CA03 CA04 CA05                       CA06 CB03 CC03 DB01 EA06                       FA05 FA06 FA08                 4J040 CA01 CA03 DB02 HD45 JA09                       JA11 JB09 KA02 KA42 KA43                       LA06 MA03 NA06 NA12 NA19

Claims (4)

[Claims] 1. A pressure-sensitive adhesive tape substrate obtained by laminating two plastic films with an adhesive, wherein the adhesive contains heat-expandable microcapsules. 2. The plastic film having a thickness of 0.
It is 012 to 0.075 mm, The adhesive tape base material of Claim 1 characterized by the above-mentioned. 3. The adhesive is composed mainly of at least one rubber selected from natural rubber, polyisoprene rubber, styrene / butadiene / styrene rubber and styrene / isoprene / styrene rubber. The pressure-sensitive adhesive tape substrate according to claim 1, which is characterized in that. 4. An adhesive layer is provided on one surface of the adhesive tape substrate, and a release agent layer is provided on the surface of the adhesive tape substrate opposite to the surface on which the adhesive layer is provided. Adhesive tape characterized by.