JPH11302608A - Pressure-sensitive adhesive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pressure-sensitive adhesive tape having excellent manual cuttability by combining a support composed of a thin foam of a polymeric compound with a thermoplastic resin film uniaxially oriented in a specified direction. SOLUTION: This tape consists of a support 1 composed of a thin polymer foam 4, desirably, a synthetic rubber foam and a uniaxially oriented thermoplastic resin film 5 having been oriented in the direction the same as that of the width of the tape, desirably, a uniaxially oriented thermoplastic polyolefin resin film and a pressure-sensitive adhesive layer 2 applied over the thin foam 4. Alternatively, the tape consists of a support composed of a thin polymer foam and a thermoplastic film one of the surfaces of which is a smooth one, and the other of the surfaces of which is a non-smooth one having many groovy recesses in the direction of the width and in which the non-smooth surface is bonded to the thin foam and a pressure-sensitive adhesive layer. Thus, it is possible to manually cut the tape without the necessity for any cutting device such as scissors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an adhesive tape. More specifically, the present invention relates to a pressure-sensitive adhesive tape having good hand-cutting properties, comprising a pressure-sensitive adhesive layer and a base material including a thin foam of a polymer compound foam and a specific thermoplastic resin film. As used herein, the term "hand-cutting property" refers to the ability to cut the adhesive tape straight in the width direction only with the fingertip of the hand without using a cutting tool such as scissors or a sawtooth-shaped cutter.

[0002]

2. Description of the Related Art Generally, an adhesive tape is, as shown in FIG.
It is composed of a base material 1 made of resin, paper, cloth, metal, and the like, and an adhesive layer 2 applied on one surface of the base material 1, and is commercially available in the form of a roll wound in a roll shape. The adhesive tape of this form is used by extracting the adhesive tape to a required length from a scroll and cutting it at a desired location. In order to increase the ease with which the pressure-sensitive adhesive tape can be pulled out from the scroll, a release agent is applied on the back surface 3, which is the surface of the substrate 1 on which the pressure-sensitive adhesive 2 is not applied, as necessary.

[0003] EPDM rubber (ethylene-propylene-ethylene) is used as an adhesive tape comprising an adhesive layer and a base containing a thin foam of a polymer compound and a thermoplastic resin film.
A pressure-sensitive adhesive tape comprising a two-layered base material and a pressure-sensitive adhesive layer formed by bonding a thin foamed product made of a diene rubber) and a biaxially-stretched polypropylene resin film or a biaxially-stretched polyethylene terephthalate resin film with an adhesive is known. The adhesive of the adhesive tape is applied on a thin foam.

[0004]

However, the above-mentioned known pressure-sensitive adhesive tapes have good hand-cutting properties of a thin foam made of a high-molecular compound constituting a base material, but do not have a biaxially stretched polypropylene resin film or a biaxially stretched polypropylene resin film. Since the stretched polyethylene terephthalate resin film has poor hand-cutting properties, it does not have any hand-cutting properties. When the film is drawn out to the required length from the scroll shown in FIG. However, there is a problem that it is extremely complicated to use such a cutting tool and to use the cutting tool for each cutting.

An object of the present invention is to provide a pressure-sensitive adhesive tape comprising a base material containing a thin foam made of a polymer compound and a film made of a specific thermoplastic resin, and a pressure-sensitive adhesive layer. Is to provide.

[0006]

Means for Solving the Problems The present inventor has developed an adhesive tape comprising an adhesive layer and a substrate containing a thin foam made of a polymer compound and a film made of a thermoplastic resin, and having good hand-cutting properties. We have been conducting research on the development of various adhesive tapes. As a result, it has been found that the above object can be achieved by using a specific film as the thermoplastic resin film constituting the base material, and the present invention has been completed.

That is, the present invention (first invention) relates to a pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer and a base material containing a thin foam of a polymer compound and a film made of a thermoplastic resin, and a film made of a thermoplastic resin. Is a uniaxially stretched thermoplastic resin film (the stretching direction of the film and the width direction of the pressure-sensitive adhesive tape are the same direction).

The present invention (second invention) is also directed to a pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer and a base material containing a thin foam of a polymer compound and a film made of a thermoplastic resin, wherein the film is made of a thermoplastic resin. Is a thermoplastic resin film characterized in that one surface is formed as a smooth surface and the other surface is formed as a non-smooth surface having a number of groove-shaped concave portions in the width direction.

Further, the present invention (third invention) is a pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer and a base material including a thin foam of a polymer compound and a film made of a thermoplastic resin, wherein the film is made of a thermoplastic resin. Is a thermoplastic resin film having a large number of fine holes formed in the thickness direction, and burrs generated at the time of forming the holes are flattened thermoplastic resin films.

Hereinafter, the present invention will be described in detail.
When the present invention is described with reference to the drawings, what is illustrated is merely an example of the present invention, and the present invention is not limited to the illustrated one. Also, the figures focus on drawing the invention in an easy-to-understand manner, and the scales do not necessarily accurately reflect actual ones.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 2 to 4 show perspective views of an adhesive tape of the present invention. FIG. 2 is a diagram illustrating the pressure-sensitive adhesive tape of the first invention. The base material 1 of the adhesive tape is formed by combining a thin material of a polymer compound foam 4 and a uniaxially stretched thermoplastic resin film 5 (the stretching direction of the film 5 and the width direction of the adhesive tape are the same direction). It is a base material 1 obtained by bonding, and an adhesive 2 is applied on a thin foam.

FIG. 3 is a view exemplifying the pressure-sensitive adhesive tape of the second invention. The base material 1 of this adhesive tape is formed of a thin material of a polymer compound foam 4 and a non-smooth surface 6 having one surface having a smooth surface 8 and the other surface having a large number of groove-shaped recesses 5 in the width direction. The base material 1 is obtained by bonding a thermoplastic resin film 7 made of the adhesive, and the pressure-sensitive adhesive 2 is applied on a thin foam 4.

FIG. 4 is a diagram illustrating a pressure-sensitive adhesive tape of the third invention. The base material 1 of the pressure-sensitive adhesive tape has a thin material of the polymer compound foam 4 and a large number of fine holes 9 formed in the thickness direction, and burrs generated at the time of forming the holes 9 are flattened. The base material 1 is obtained by bonding a thermoplastic resin film 10 with the adhesive 2 applied on a thin foam 4.

The thin foam of the polymer compound (foam) according to the pressure-sensitive adhesive tape of the present invention is a thin foam obtained by subjecting the polymer compound to foam processing (sponge processing). It is a processing method. There is no particular limitation on the foaming method of the foam that can be used in the present invention. Examples of the thin foam include, in addition to the rubber foams such as the EPDM rubber foams described above, polyurethane foams and polyethylene foams. Known foams such as polyolefin foams such as polypropylene and foams, and polyvinyl chloride foams can be used. When it is desired to use a thin foam having excellent water resistance and excellent elasticity, a rubber foam such as an EPDM rubber foam is preferable.

The thickness of the thin foam material constituting the base material of the pressure-sensitive adhesive tape of the present invention may be appropriately selected depending on the use of the pressure-sensitive adhesive tape of the present invention, and is generally 3 mm to 30 mm. The expansion ratio of the foam is not particularly limited, and may be set according to the use of the pressure-sensitive adhesive tape.
The expansion ratio is preferably from 7 to 50, and more preferably from 10 to 30.

The uniaxially stretched thermoplastic resin film according to the pressure-sensitive adhesive tape of the first invention refers to a thermoplastic resin film stretched substantially in the horizontal direction (a direction perpendicular to the film forming direction). Examples of such thermoplastic resins include polyolefin resins; polyester resins such as polyethylene terephthalate resin and polyethylene naphthalate resin; vinyl chloride resins such as hard vinyl chloride resin; and methacrylic resins such as polymethyl methacrylate resin. Examples of the plastic resin include a polyolefin resin and a polyester resin. Examples of the polyolefin resin include a polyethylene resin, a polypropylene resin, a copolymer resin of ethylene and propylene, a copolymer resin of ethylene and / or propylene and one or more other α-olefins, and the like. Preferred examples of the polyolefin resin include a polyethylene resin and a polypropylene resin. Here, a copolymer resin with an α-olefin can be exemplified, and a polyethylene resin or a polypropylene resin can be exemplified as a preferable polyolefin resin. Here, butene-1, pentene-1, hexene-1, heptene-1,
Octene-1, nonene-1, 4-methylpentene-1,
Decene-1 and the like can be exemplified.

Among these, a uniaxially stretched polyolefin resin film such as a uniaxially stretched polypropylene resin film can be preferably used. There is no limit on the thickness of the film,
Generally 10 μm to 50 μm, preferably 25 μm to 40
μm. From the viewpoint of imparting hand-cutting properties to the pressure-sensitive adhesive tape, the uniaxially stretched thermoplastic resin film is used such that the stretching direction is the same as the width direction of the pressure-sensitive adhesive tape.

According to the pressure-sensitive adhesive tape of the second invention, a thermoplastic resin film in which one surface is formed as a smooth surface and the other surface is formed as a non-smooth surface having a large number of groove-shaped recesses in the width direction, 5. The film as illustrated in FIG.
Is for imparting hand-cutting properties to the film. The kind of the thermoplastic resin for the film having the concave portions is not particularly limited as long as it can be formed into a film by a molding method such as a melt extrusion molding method or an inflation method. As such a film, a non-stretched or stretched film can be appropriately used. As such a thermoplastic resin, the thermoplastic resin used for the uniaxially stretched thermoplastic resin film according to the pressure-sensitive adhesive tape of the first invention can be similarly used. Specific examples thereof include polyolefin resins; polyester resins such as polyethylene terephthalate resin and polyethylene naphthalate resin; vinyl chloride resins such as hard vinyl chloride resin; and methacrylic resins such as polymethyl methacrylate resin. Examples of the resin include a polyolefin resin and a polyester resin.

The shape of the concave portion is not particularly limited, and is, for example, a buoy (V) valley shape formed continuously from one end to the other end of the base material (see FIG. 5). The shape shown in FIG. 5 is a preferable shape from the viewpoint of the hand-cutting property of the adhesive tape, but the concave portion is not limited to this shape.
It may be of another shape such as a valley shape,
It may be formed discontinuously with a discontinuity.

Regarding the size of the concave portion (see FIG. 5), the depth D is 0.03 mm to 0.3 mm, preferably 0.04 m.
If it is less than 0.03 mm, the hand-cutting property is unsatisfactory. If it is more than 0.3 mm, the hand-cutting property is good, but the tensile strength in the longitudinal direction is small, and the depth is extremely large. In some cases, when the adhesive tape is spread from the scroll, the adhesive tape may be cut at an unexpected location. The distance W between the concave portions is 0.5 mm to 5 mm, preferably 0.6 mm to 1.4 mm, from the viewpoint of obtaining an adhesive tape having good hand-cutting properties. The thickness T may be appropriately determined depending on the application and the like, and is generally 40 μm to 400 μm.
Is within the range. Also, the difference between the thickness T and the depth D (T−
D) is generally 0.01 mm to 0.1 mm from the viewpoint of obtaining an adhesive tape having good hand-cutting properties.

The method for producing the thermoplastic resin film having the concave portions is not limited, but the method described in Japanese Patent No. 2694885 (see FIG. 6), that is, the film is pressed between the squeezing roll 31 and the smooth roll 32 The method of forming the concave portion in the film by using the method is a simple and general method. In this method, the thermoplastic resin film may be an unstretched film or a stretched film, but an unstretched film is preferred. This is because, when a stretched film is used, the stretched film must be reheated and softened in order to form a concave portion, but if softened, the degree of stretching is reduced, and the significance of using a stretched film is reduced. When the concave portion is formed by the method shown in FIG. 6, the film in the softened state immediately after being extruded from the extruder 33 is used as it is in the squeezing roll 31 and the smoothing roll 32.
Alternatively, after a previously produced film (a film in a solidified state) at room temperature is softened by heating, the film may be pressed between a squeezing roll and a smooth roll. When a film having a concave portion is manufactured by the method shown in FIG. 6, unless the shape of the concave portion is deformed to an inconvenient degree or the like, for the purpose of increasing the mechanical strength of the film, etc., a squeezing roll and a smooth roll are used. After the pressing, the film may be subjected to a stretching treatment.

As used herein, the term "smooth surface" is a term meaning a substantially smooth surface, and does not mean a surface having no physical unevenness at all. Is a term used for a "non-smooth surface" obtained by positively forming a concave portion or the like. Therefore,
By the stretching process after pressing by the squeezing roll and the smooth roll, even if some unevenness of the non-smooth surface is comparable to the non-smooth surface on the surface having the history of contact with the smooth roll, A surface having a degree of unevenness is not a non-smooth surface but a smooth surface. Similarly, the term "smooth roll" referred to in the present specification means a roll having a substantially smooth surface, and a roll having a smooth surface in a physically strict sense. is not.

FIG. 4 shows a thermoplastic resin film according to the third invention, which has a large number of fine holes formed in the thickness direction and burrs generated during the formation of the holes are flattened. A film 10 such as a film on the upper side of a substrate 1 to be formed. Examples of the thermoplastic resin according to the film 10 include the thermoplastic resins exemplified in the description of the second invention. Such a film may be appropriately stretched or unstretched, but is preferably a stretched thermoplastic resin film, and more preferably a biaxially stretched thermoplastic polyolefin resinous film. The thickness of the film may be appropriately set according to the use of the pressure-sensitive adhesive tape, and is generally 7 μm to 200 μm, preferably 12 μm to
80 μm.

The pore diameter and the pore density (the number of pores) of the large number of fine pores need only be within a range capable of imparting hand-cutting properties to the adhesive tape. Generally, the pore diameter D (see FIG. 7) is 2 μm to 2 μm.
The pore density is 4 mm, preferably 20 μm to 800 μm, more preferably 20 μm to 400 μm. The pore density depends on the pore diameter D, but is 4 to 4 per unit surface area (1 cm ² ).
00, preferably 9 to 72. Here, the hole diameter when the hole shape is circular means its diameter, while the hole diameter when the hole shape is other than circular means the diameter of a circle having the same area as the hole. The shape of the hole (shape of the portion having the hole diameter D) may be any as long as it can impart hand-cutting properties to the adhesive tape, and depends on the shape of a jig such as a needle for forming a hole. Shaped, square and irregular.
The hole arrangement may be any as long as it can impart hand-cutting properties to the adhesive tape, and may be an irregular arrangement or an ordered arrangement such as a lattice, but the adhesive tape is cut straight. From the viewpoint of doing so, it is preferable to arrange the pressure-sensitive adhesive tapes linearly in the width direction.

The quality of the hand-cutting property at the starting point of cutting the adhesive tape depends on the quality of the tearing property of the end in the width direction of the adhesive tape. Resistance), the hole density at the end of the substrate should be larger than the hole density at the center of the substrate in order to improve the hand-cutting property at the starting point of cutting. The hole density may have a slope.

The method for forming a large number of fine holes in the thickness direction of the thermoplastic resin film is not particularly limited.
Are simple and preferred methods. This method
The film is pressed, for example, at room temperature, between a smooth roll 41 whose surface is coated with a soft material such as silicone rubber or urethane resin (this smooth roll 41 is a known roll) and a needle roll 42. Is a method for continuously producing a film 10 having a large number of fine holes 43. The thermoplastic resin film 10 continuously supplied from the left side of FIG. 8 is passed between the needle roll 42 and the smooth roll 41 and is pressed by both rolls 42, 41.
By passing the needles 44 through the film 10 to such an extent that the needles 44 pierce the soft material of the smoothing roll 41, the film 10 having many fine holes 43 is obtained. The needle roll means a roll having a large number of fine protrusions having a fine diameter on its surface, and as the roll, a large number of hard metal fine diameter needles having a sharp tip are embedded in the surface. A roll can be illustrated, and this roll is publicly known.

FIG. 9 is a cross-sectional view schematically showing a thermoplastic resin film having a large number of fine holes 43 obtained in the mode shown in FIG. 8, focusing on one hole 43. The upper surface of the film 10 shown in FIG.
At the periphery of the hole 43 on the surface having the history of contact with the burrs 1, a burr 45 exists in a state of rising upward from the surface.

There is no particular limitation on the method of flattening the burrs 45 generated during the formation of the holes 43, and the burrs 4 shown in FIG.
5 can be exemplified by a method of pressing a film 10 having a heated surface between a metal roll having a smooth surface and a rubber roll having a smooth surface. By this method, the burrs 45 shown in FIG. 9 that have risen upward from the surface are substantially flattened as shown in FIG.

FIG. 7 shows a film 1 in which burrs 45 are flattened.
FIG. Film 1 shown in FIG.
The burrs 45 rising upward from the surface 0 are flattened to substantially the same surface as the upper surface of the film 10 by heat treatment under pressure as shown in FIG. That is,
The film 10 shown in FIG. 7 has substantially no burr 45 rising upward from the surface despite having the hole 43. Flattened burr 4 shown in FIG.
Since 5 covers the hole 43, the upper hole diameter d in FIG. 7 is reduced to a smaller hole diameter before heat treatment under pressure (the upper hole diameter in FIG. 9). The hole diameter d is generally about 1/10 of the hole diameter D.
By selecting the type of thermoplastic resin film and heat treatment conditions under pressure, the hole diameter d can be partially reduced to zero, and the hole in this case becomes a non-through hole. . Here, "the hole diameter d is partially zero" means that any part of the hole (for example, the inside close to the surface of the film)
Means that it is blocked.

A film in which burrs are flattened and the hole diameter d is partially zero (a non-through hole) has a problem of strike-through (even a film having a low viscosity) because the holes are non-through holes. (A problem that the agent applied to one side of the film reaches the other side of the film) does not occur, and the burr is flattened, so that the adhesive can be applied effectively (the amount of the applied adhesive) From the point of view)
Printing inks (printing inks generally have low viscosity)
When printing characters or patterns on the back of the adhesive tape using a, the hole is a non-through hole, so there is no problem of strikethrough,
In addition, it is preferable from the viewpoint that the burrs are flattened, so that clear printing can be performed.

The temperature of the heat treatment under pressure is a temperature at which burrs can be flattened without impairing the properties of the pressure-sensitive adhesive tape as a substrate, and is appropriately set according to the thermal properties such as the softening point of the thermoplastic resin. do it. Generally, when the thermoplastic resin is a polypropylene resin, the heat treatment temperature is about 120 ° C to about 240 ° C.
° C, and the heat treatment temperature for polyethylene resin is about 8
0 ° C to about 180 ° C.

The pressure-sensitive adhesive for the pressure-sensitive adhesive tape of the present invention is not particularly limited, and may be a pressure-sensitive adhesive known in the field of pressure-sensitive adhesive tapes. Examples of the adhesive include an acrylic adhesive, a vinyl ether-based adhesive, a silicone-based adhesive, and a rubber-based adhesive. The form of the pressure-sensitive adhesive is not particularly limited, and may be any type such as a solution-type pressure-sensitive adhesive, an emulsion-type pressure-sensitive adhesive, and a hot-melt-type pressure-sensitive adhesive. If the pore diameter d is not sufficiently small, the pressure-sensitive adhesive may easily break through. Therefore, the viscosity (20 ° C.)
A high-viscosity adhesive having a viscosity of about 8,000 cps to about 70000 cps, preferably about 20,000 cps to about 50,000 cps is preferred. Approximately 2000c when the hole diameter d is small
The problem of strikethrough does not occur even with an adhesive having a low viscosity of from ps to about 8000 cps.

The pressure-sensitive adhesive tape of the present invention means not only a pressure-sensitive adhesive tape having only one surface of the substrate coated with a pressure-sensitive adhesive, but also a double-sided pressure-sensitive adhesive tape having another surface of the substrate coated with a pressure-sensitive adhesive. And a removable tape. When a re-peelable pressure-sensitive adhesive tape is used, the pressure-sensitive adhesive may be appropriately selected from pressure-sensitive adhesives known in the field of re-peelable tapes. The method of applying the pressure-sensitive adhesive to the substrate is not particularly limited,
For example, a method known in the field of an adhesive tape such as a roll coater method may be employed.

The thickness of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape of the present invention is not particularly limited, and may be appropriately determined according to the size of the pressure-sensitive adhesive tape (width or thickness of the base material), use, and the like.
μm to 50 μm. The simplest embodiment of the substrate according to the pressure-sensitive adhesive tape of the present invention is a foam 4 and a uniaxially stretched film 5.
, A two-layer substrate 1 (see FIG. 2) and a foam 4
And a film 7 having a concave portion 5 in two layers (see FIG. 3. Although not shown, even if the film having the concave portion is positioned such that the concave portion faces the outside of the substrate, Good) and a two-layer substrate 1 (see FIG. 4) formed by laminating a foam 4 and a film 10 having holes 9. Examples of a method for manufacturing these base materials include a manufacturing method in which each layer constituting the base material is separately manufactured, and then these layers are joined with an adhesive or the like. Although not shown, in the base material shown in FIGS.
May be applied to the other surface (upper surface in the figure) or to both surfaces of the substrate.

Here, in the substrate according to the pressure-sensitive adhesive tape of the first invention, that is, the substrate including a thin polymer compound foam and a uniaxially stretched thermoplastic resin film, for example, a polyurethane foam is used as the foam. When using a laminated film of a biaxially stretched polypropylene resin film and a laterally uniaxially stretched polypropylene resin film as a thermoplastic resin film, a biaxially stretched polypropylene resin film is included as a layer constituting a base material. Nevertheless, an adhesive tape with good hand-cutting properties can be obtained. This is surprising considering that the conventional pressure-sensitive adhesive tape having no hand-cutting property includes a biaxially stretched polypropylene resin film as a layer constituting a substrate.

The substrate according to the pressure-sensitive adhesive tape of the present invention is shown in FIGS.
The three layers formed by further laminating another film (thin) made of resin, paper, cloth, metal or the like are not limited to those shown in FIG. 4 as long as the hand-cutting property of the obtained adhesive tape is not impaired. The above multi-layer substrate may be used. Each layer constituting the base material is bonded with an adhesive and laminated to form a two-layer base material (FIG. 2).
In the case of producing a base material having three or more layers, a rubber adhesive such as a polyester adhesive, a chlorinated polypropylene adhesive, a urethane adhesive, or a nitrile-butadiene rubber (NBR) may be used. An adhesive, an ethylene-vinyl alcohol (EVA) adhesive, a mixture of these adhesives, and the like can be exemplified, and these adhesives may be commercially available products. The form of the adhesive is not particularly limited,
Any type such as a solution type adhesive, an emulsion type adhesive and a hot melt type adhesive may be used. The above-mentioned pressure-sensitive adhesive can also be used as a bonding agent for laminating layers.

The substrate and the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape of the present invention may contain various fillers, coloring agents and the like according to the use of the pressure-sensitive adhesive tape, as long as the object of the present invention is not impaired. . In addition, each layer constituting the base material is coated with an adhesive or an adhesive in order to increase the affinity between the surface of the base material to which the adhesive is applied and the adhesive or to enhance the bonding between the layers by the adhesive. The surface of the layer to be coated may be subjected to corona discharge treatment or primer treatment in advance, and these pretreatments are well known in the field of pressure-sensitive adhesive tapes.

[0038]

EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the scope of the present invention is not limited by these examples. 1. Film release treatment Compounding ratio of release agent Silicone release agent SD7226 100 parts by weight (manufactured by Toray Dow Corning Co., Ltd.) Platinum crosslinking agent SRX212 0.6 parts by weight Toluene 150 parts by weight Film to be subjected to release treatment a. Horizontally stretched polypropylene film 25 μm double-sided corona treated product (YT-22 manufactured by Toray). b. Biaxially oriented polypropylene film 25 μm double-sided corona treated product (manufactured by Santox, PA-20). This is a film that has been punched and heat-treated. c. Perforated biaxially stretched polyester film 16μm SK
A laminated product of a film made of C and the film of the above a. A film with a release agent applied to the polypropylene film surface. d. Biaxially oriented polypropylene film 25 μm double-sided corona treated product (manufactured by Santox, PA-20). Application amount of release agent Solid content 0.5 with gravure coater 120 mesh roll
g / m ² and dried at 120 ° C. Peeling value a. 95 g / mm b. 80 g / mm c. 80 g / mm d. 80 g / mm * Kyodo Giken Chemical's # 201 tape was used as the peeling tape. 2. Lamination of foam and film (1) Adhesion is performed by applying a moisture-curable urethane-based product # 3045 manufactured by Nortape Kogyo Co., Ltd. to the film with a reverse coater so as to have a solid content of 5 μm, and dry laminating. (2) Adhesion is carried out in the same manner as in the above (1), and an acrylic pressure-sensitive adhesive “# 5034 made by Showa Kobunshi” is laminated with a solid content of 40 μm in thickness. 1. A. , B. , C. d. An adhesive and a pressure-sensitive adhesive were laminated on each of the foams on the surface opposite to the release-treated surface of each film in the same manner as in the above steps 1 and 2. The foam is a polyethylene foam 30-fold foam "Tofu brand name BEF # 3005" 5 mm thick, and the urethane foam 50-fold foam "Inoac trade name ECS" is 10 mm thick. EPD
The M foam 10-fold foam "Toyo Quality One trade name Lucila" used a 10 mm thickness, and the vinyl chloride foam 10-fold foam "Achilles trade name Soft Air Seal" used a 5 mm thickness. (3) Application of adhesive The adhesive was applied to the opposite side of the film laminate.

The coating method was not a method of directly applying to the foam, but a transfer method using a release paper. A transfer method is desirable in terms of characteristics such as porosity, thermoplasticity, and wall thickness. The release paper is a process paper and is not attached to the finished product. * Process paper used was a semi-bleached kraft paper polyethylene laminate peeled product “Kite Chemical's product name # 70SN”.

* The pressure-sensitive adhesive was a solvent-type acrylic type “trade name # 1717 manufactured by Soken Chemical Co., Ltd.” applied with a comma coater so as to have a solid content of 60 μm. 3. Mixing ratio of adhesive # 1717 100 parts by weight of crosslinking agent 0.5 part by weight of "Coronate L75, trade name of Nippon Polyurethane" Evaluation of hand cutability

[0041]

[Table 1]

[0042]

According to the present invention, in a pressure-sensitive adhesive tape comprising a substrate and a pressure-sensitive adhesive layer comprising a thin foam of a polymer compound foam and a thermoplastic resin film, the thermoplastic resin film is converted into a specific film, that is, a uniaxially stretched thermoplastic resin. A film made (the stretching direction of the film and the width direction of the adhesive tape are the same direction); one surface is formed as a smooth surface and the other surface is formed as a non-smooth surface having a number of groove-shaped recesses in the width direction. A thermoplastic resin film having a large number of fine holes formed in the thickness direction, and burrs generated at the time of forming the holes are formed into a flattened thermoplastic resin film. It is possible to obtain an adhesive tape having good cutting properties.

The pressure-sensitive adhesive tape of the present invention can be used in various fields. For example, in the field of civil engineering and construction, the purpose of the present invention is to provide waterproofing and airtightness on the foundation of roof tiles of houses and buildings and the foundation of inner and outer walls. In the field of transportation equipment, waterproof and waterproofing of door panels and vibrating parts of automobiles
Applications for vibration control, vibration control, airtightness, etc .; In the field of home appliances and machinery, applications for heat insulation, airtightness, etc. in refrigerators, air conditioners, dryers, vending machines, etc., copiers, fax machines, etc. Applications for dust prevention, airtightness, etc.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an adhesive tape in the form of a roll wound in a roll shape.

FIG. 2 is a perspective view showing a pressure-sensitive adhesive tape of the present invention using a two-layer laminate of a foam and a uniaxially stretched film as a base material.

FIG. 3 is a perspective view showing a pressure-sensitive adhesive tape of the present invention using a two-layer laminate of a foam and a film having concave portions as a base material.

FIG. 4 is a perspective view showing a pressure-sensitive adhesive tape of the present invention using a two-layer laminate of a foam and a film having pores (porous film) as a base material.

FIG. 5 is a perspective view showing a film having a concave portion on the base material of the pressure-sensitive adhesive tape of the present invention.

FIG. 6 is a view showing a method for producing a film having a concave portion, which is applied to the base material of the pressure-sensitive adhesive tape of the present invention.

FIG. 7 is a cross-sectional view showing a film having holes in which burrs are flattened, on a base material of the pressure-sensitive adhesive tape of the present invention.

FIG. 8 is a view showing a method of forming a large number of fine holes in a film by a needle roll.

FIG. 9 is a cross-sectional view showing a film having holes whose burrs are not flattened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Pressure-sensitive adhesive layer 3 ... Back surface 4 ... Foam 5 ... Film 6 ... Non-smooth surface 7 ... Film with concave portions 8 ... Smooth surface 9 ... Hole 10 ... Film with holes 21 ... Smooth surface 22 ... Concave portions 31 ... Squeezing roll 32 ... Smooth roll 41 ... Smooth roll 42 ... Needle roll 43 ... Hole 44 ... Needle 45 ... Burr

Claims (6)

[Claims] A pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer comprising a base material including a thin foam of a polymer compound foam and a thermoplastic resin film, and a pressure-sensitive adhesive layer, wherein the thermoplastic resin film is a uniaxially stretched thermoplastic resin film ( The stretching direction of the film and the width direction of the adhesive tape are the same direction). 2. A foam made of a polymer compound is a foam made of synthetic rubber, and a film made of a uniaxially stretched thermoplastic resin is a film made of a uniaxially stretched thermoplastic polyolefin resin.
The adhesive tape as described. 3. A pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer and a base material containing a thin foam of a polymer compound foam and a thermoplastic resin film, wherein one surface of the thermoplastic resin film has a smooth surface, An adhesive tape, characterized in that the other surface is a thermoplastic resin film formed on a non-smooth surface having a number of groove-shaped concave portions in a width direction. 4. The pressure-sensitive adhesive tape according to claim 3, wherein the high-molecular compound foam is a synthetic rubber foam, and the non-smooth surface of the thermoplastic resin film is joined to a thin foam. 5. A pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer and a base material including a thin foam of a polymer compound foam and a thermoplastic resin film, wherein the thermoplastic resin film is formed in a thickness direction. An adhesive tape having a large number of fine holes, and a burr generated at the time of forming the holes is a thermoplastic resin film which is flattened. 6. The pressure-sensitive adhesive tape according to claim 5, wherein the polymer foam is a synthetic rubber foam and the thermoplastic resin film having holes is a biaxially stretched thermoplastic polyolefin resin film having holes. .