JPH1033585A - Adhesive tape and first aid bandage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure-sensitive adhesive tape which has a good appearance and a good fit, is less uncomfortable, has a tight tightness, good adhesiveness during use, and is particularly suitable for emergency bandages. Providing emergency bandages. SOLUTION: In a pressure-sensitive adhesive tape obtained by applying a pressure-sensitive adhesive to one surface of a non-woven fabric having air permeability and elasticity, the non-woven fabric is a polyurethane non-woven fabric formed from ultra-fine polyurethane filaments having an average fiber diameter of 7 to 15 μm. Adhesive tape, and an emergency bandage comprising the adhesive tape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive tape and an emergency bandage based on a nonwoven fabric.
Good fit, less discomfort, appearance, ease of application,
The present invention relates to an adhesive tape which is excellent in tightness of winding, sticking, adhesion during use, air permeability and the like, and is particularly suitable for emergency bandages, and an emergency bandage using the adhesive tape.

[0002]

2. Description of the Related Art In general, first-aid adhesive plasters are generally rectangular (usually oval) tapes formed by applying an adhesive to one side of a substrate.
And a pad made of gauze or the like is placed at the center of the pressure-sensitive adhesive layer, and a coating material (release liner) is attached thereto. First aid bandages are required to have various properties such as toughness, flexibility, stress relaxation, surface lubrication, water resistance, and air permeability. More specifically, (1) it is not easily cut even when rubbed or pulled during use, (2) it is easy to cope with flexion of the joint or expansion and contraction of the skin, (3) it is wound around a finger, Even if you pull it a little and stick it, it will relax in a short time and the feeling of tightening will disappear, and the discomfort will disappear,
(4) The surface is moderately slippery and hardly peels off when rubbed, (5) The strength does not decrease even when working with water or taking a bath, (6) It has excellent breathability and moisture permeability, rough skin and moisture It is required that there is no peeling due to the above. In addition, it is required that the first-aid bandage has suitability for printing and that the physical property change due to temperature change is small.

Many of these required qualities for emergency bandages are mainly related to the type, physical properties, structure, etc. of the base material. Conventionally, as a base material of an adhesive tape for emergency bandages, for example, a polymer film such as a soft polyvinyl chloride film, an ethylene-vinyl acetate copolymer film, a polyurethane film, or a nonwoven fabric such as a nylon nonwoven fabric, a polyester nonwoven fabric, and a polyurethane nonwoven fabric Has been used. Among these, flexible polyvinyl chloride film is excellent in toughness, stress relaxation, printing suitability, etc., and is inexpensive, so it is widely used as a base material for emergency bandages, but the fit is not enough. However, there are problems such as lack of flexibility, slight surface lubricity, insufficient air permeability, and large changes in physical properties due to temperature changes during bathing.

Recently, stretchable non-woven fabrics such as polyurethane non-woven fabrics have attracted attention as base materials for emergency bandages because of their elasticity, breathability, and excellent flexibility. For example, (1) Japanese Patent Publication No.
Melt-spun polyurethane elastic filaments are laminated without being substantially bundled, and the contact points of the laminated filaments are joined by heat fusion. There has been proposed a medical pressure-sensitive adhesive sheet provided with a non-irritating pressure-sensitive adhesive. (2) JP-A-61-69242 proposes a pressure-sensitive adhesive tape in which a pressure-sensitive pressure-sensitive adhesive layer is laminated on at least one surface of a stretchable nonwoven fabric containing 50% by weight or more of an elastic polyurethane fiber. (3) Fairness 2
Japanese Patent No. 444739 discloses a method of applying a pressure-sensitive adhesive layer to one surface of a substrate made of a polyurethane nonwoven fabric, and adhering a hygroscopic sheet made of a cellulosic fiber to a part of the adhesive layer.
Further, a wound surface protection material in which a releasable sheet is adhered to the entire surface has been proposed. (4) In JP-A-2-78614, an adhesive layer is provided on one surface of a support, and at least a part of an elastic member formed of an elastic polyurethane fiber is embedded in the adhesive layer. Medical patches have been proposed. (5) JP-A-3-200885 proposes a pressure-sensitive adhesive tape in which an organopolysiloxane-based pressure-sensitive adhesive layer is provided on one surface of a nonwoven fabric made of polyurethane elastic fibers. (6) JP-A-7-52326
In Japanese Patent Application Laid-Open Publication No. H10-157, a pressure-sensitive adhesive tape and a wound surface protecting material are proposed in which an organopolysiloxane-based pressure-sensitive adhesive layer containing 1 to 10% by weight of an inorganic filler is provided on one surface of a nonwoven fabric made of polyurethane elastic fiber. ing. (7) JP-A-8-3
No. 3673 discloses that a pressure-sensitive adhesive is applied to one surface of a nonwoven fabric having air permeability and elasticity, the surface of the nonwoven fabric is laminated with a film having moisture permeability and waterproofness, and the edges are sealed. Adhesive films for emergency bandages that have been treated have been proposed. The publication discloses, as nonwoven fabrics, polyurethane elastic fiber nonwoven fabrics, polyester elastic fiber nonwoven fabrics, nonwoven fabrics made of a styrene-isoprene-styrene type block copolymer, and the like.

[0005] However, the conventional emergency plasters based on a polyurethane nonwoven fabric are still insufficient in ease of application (usability), tightness in winding, sticking, adhesion during use, appearance, and the like. Emergency adhesive plasters are required to be flexible and have a good fit to the skin.In addition, when wrapped around a finger, they must be properly tightened and not slip off or come off during use. Required. However, conventional emergency plasters, even if the base material is a polymer film or a nonwoven fabric, for example, when the attached finger is bent, such as when it is stiff and has poor fit, or when bathing with the finger wound However, there are problems such as easy removal. It has been found that the structure and physical properties of the base material are significantly involved in the root of such problems.

[0006] The conventional polyurethane nonwoven fabric has an average fiber diameter of about 20 to 30 µm, and lacks uniformity in appearance, easiness of application, fit, and the like. In addition, the conventional polyurethane nonwoven fabric is an MD (Machine Dir).
orientation (machine direction) and TD (Tr
The strength and tensile stress in an inverse direction (width direction) were weak. That is, a polyurethane nonwoven fabric is manufactured by, for example, spinning a molten resin as a filament from pores, causing it to accompany a high-speed airflow, depositing it in a sheet form on a net conveyor, and collecting it. Since the conveyor moves in the flow direction of the nonwoven fabric to be manufactured, the resulting nonwoven fabric is oriented in the flow direction (MD) of the product during manufacture. The conventional polymer film substrate was the same in that it was oriented in the MD. That is, a polymer film for a substrate such as a soft polyvinyl chloride film is not particularly stretched and formed at the time of its production, but is tended to be MD-pulled at the time of calendering or take-up by MD. have.

On the other hand, first-aid adhesive plasters are usually prepared by punching an adhesive tape into an oval, substantially rectangular shape. Usually, the long side of the rectangular shape is coincident with the TD of a base material having a small tensile stress and easy to set. Let me. In addition, by matching the short side of the rectangle with the MD of the base material, the moving distance of the adhesive tape per unit operation in the punching process is short, so that there is an advantage that continuous punching operation can be performed at high speed and precisely. is there. However, since such first-aid bandages are oriented in the short side direction (MD of the base material), the orientation is relaxed when the temperature rises or undergoes repeated expansion and contraction, and shrinks in the short side direction. Easy to stretch in the direction. Therefore, when such an emergency bandage was wrapped around a finger, it was easy to loosen and slip off. Further, such an emergency bandage has a problem that the edge is easily peeled at the time of application.

As a method for solving such a problem,
For example, in emergency bandages based on polymer films,
When punching the first-aid bandage from the adhesive tape, a method of matching the long side of the rectangle to the MD of the base and the short side to the TD of the base can be considered. However, according to this method,
Although an emergency bandage having relatively good tightness against fingers can be obtained, ease of application and ease of application are not sufficient. In addition, since the long side of the first-aid bandage is punched in accordance with the MD of the base material, the distance of movement of the adhesive tape per unit operation is increased in a continuous punching step, and high-speed and precise punching becomes difficult. In addition, since the emergency bandage based on the non-woven fabric oriented in the MD has low strength and tensile stress in the long side direction (TD of the non-woven fabric), the basis weight of the non-woven fabric is required to obtain the necessary strength and tensile stress. I had to increase (weight). However, when the basis weight of the nonwoven fabric is increased, in addition to being economically disadvantageous, the nonwoven fabric becomes too strong in the short side direction (MD of the nonwoven fabric). Inferior in fit.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide good appearance and fit, less discomfort, tight winding,
An object of the present invention is to provide an adhesive tape which has good adhesiveness during use and is particularly suitable for an emergency bandage, and an emergency bandage using the adhesive tape. The present inventors have conducted intensive studies to overcome the problems of the prior art, and as a result, by using a polyurethane nonwoven fabric made of a polyurethane filament having an extremely small fiber diameter as a base material as compared with the conventional product, the appearance and fit were improved. It has been found that an emergency plaster can be obtained that has good properties, has less discomfort, and can satisfy other required quality to a high degree. Furthermore, while maintaining flexibility, the polyurethane nonwoven fabric made of ultrafine filaments is oriented in the width direction, and 50% tensile stress (x) in the machine direction (MD) and 50% tensile stress (y) in the width direction (TD). ) Is 1.10 to 2.0, which is not found in conventional products.
When adjusted to a range of 0, it was found that an emergency bandage having further improved properties such as fit was obtained. The present invention has been completed based on these findings.

[0010]

According to the present invention, in a pressure-sensitive adhesive tape in which a pressure-sensitive adhesive is applied to one surface of a non-woven fabric having air permeability and elasticity, the non-woven fabric has an average fiber diameter of 7 to 15 μm.
A pressure-sensitive adhesive tape characterized by being a polyurethane nonwoven fabric formed from ultrafine polyurethane filaments of the above. According to the present invention, there is provided a polyurethane nonwoven fabric formed from the above-mentioned ultrafine polyurethane filaments, wherein a 50% tensile stress (x) in the machine direction (MD) and a 50% tensile stress (y) in the width direction (TD). ) And the ratio (y /
An adhesive tape based on a polyurethane nonwoven fabric wherein x) is in the range of 1.10 to 2.00 is provided. further,
According to the present invention, there is provided an emergency bandage made of these adhesive tapes. The first-aid bandage is generally rectangular, and is punched out with its long side aligned with the TD of the base and its short side aligned with the MD of the base. In the present invention,
The machine direction (MD) refers to the flow direction (Machine Di) of a product at the time of manufacturing a polymer film or nonwoven fabric as a base material.
region) and the width direction (T
D) is the direction perpendicular to the machine direction on the surface of the substrate (Tra).
nsverse Direction).

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Nonwoven fabrics such as polyurethane nonwoven fabrics are produced by various methods such as a spunbond method, a melt blow method, and a flash spinning method. Nonwoven fabrics, such as polyurethane nonwoven fabrics, which are the base material of the adhesive tape for first-aid bandages, are often manufactured by a melt blow method. In the melt blow method, a thermoplastic polymer is melted, discharged from pores, blown off with a high-speed heated gas, and collected by a net conveyor or the like to form a nonwoven fabric. Conventionally, as a method for producing a polyurethane nonwoven fabric, for example, after adding and kneading a polyisocyanate compound to a molten thermoplastic polyurethane elastic material, a filament spun from a fine hole is jetted along with a high-speed airflow, and is then jetted on a net conveyor. (Japanese Patent Publication No. 64-8746). The net conveyor (endless belt) is moved in the flow direction of the nonwoven fabric to be manufactured. The web collected on the net conveyor is pressed by a roller if necessary, and wound up as a nonwoven fabric. The collection web has sufficient morphological stability as it is because of the entanglement and partial fusion of the ultrafine fibers, but may be embossed to improve the strength.

In order to produce a polyurethane nonwoven fabric composed of ultra-fine filaments having an average fiber diameter of 7 to 15 μm, for example, there is a method of improving the melt blow method to make the diameter of the nozzle pores extremely small. The nonwoven fabric produced by such a production method is usually not less orientated in the flow direction (MD) of the product at the time of production. The fact that the nonwoven fabric is oriented in the MD means that the MD 50% tensile stress (x) and the TD
It can be determined from the ratio α (y / x) of the 50% tensile stress (y) in the direction. A conventional nonwoven fabric substrate usually has an α value of 0.90 or less. Table 1 shows the measurement results of α values of typical commercially available polyurethane nonwoven fabrics conventionally used as base materials such as adhesive tapes for emergency bandages.

[0013]

[Table 1] (* 1) Tensile test: width 19 mm, gripping interval 50 mm,
Unit: N / 19 mm, measured at 23 ° C ± 2 ° C. (* 2) Embossing (point heat compression; MD, TD
(Each 1.4mm pitch)

In the present invention, the polyurethane nonwoven fabric has the ratio α
But usually 1.10 to 2.00, preferably 1.10 to 2.00
It is desirable to be in the range of 1.50 and to be more strongly oriented in TD than in the conventional product. A stretchable nonwoven fabric having such a direction is obtained by reciprocating a nozzle having pores in a width direction and moving a net conveyor in a widthwise direction of a nozzle in a method of manufacturing a nonwoven fabric by a melt blow method. Speed lower than the moving speed (for example, 1/3
The following speed) can be obtained.
When a polyurethane nonwoven fabric is manufactured by the above method, the required strength can be obtained even if the average fiber diameter is 7 to 15 μm, which is as small as about 1/3 to about 1/2 of the fiber diameter of a general polyurethane nonwoven fabric. In addition, a non-woven fabric having a uniform thickness can be obtained with less thickness non-uniformity that is common in non-woven fabrics.

[0015] Polyurethane fibers are highly elastic fibers exhibiting specific elasticity, and the ultrafine fibers constituting the polyurethane nonwoven fabric are also excellent in elasticity. The chemical structure of the polyurethane fiber is a segmented urethane block copolymer consisting of a soft long chain soft segment having a low melting point and having almost no crystals, and a hard segment having a high melting point and a rigid and strong cohesive force. As a method for producing a polyurethane nonwoven fabric, generally, a method is employed in which melt polymerization is carried out using polyol, diisocyanate, and a low molecular weight diol serving as a hard segment as raw materials, and a nonwoven fabric is formed by a melt blow method using this polymer.

As the polyurethane, a thermoplastic polyurethane elastic body which can be melt-spun is suitable. Examples of the raw material polyol include low melting point polyols having a molecular weight of 500 to 6000, such as dihydroxy polyether, dihydroxy polyester, dihydroxy carbonate, and dihydroxy polyester amide. Usually, polytetramethylene glycol is used as the polyether soft segment. Examples of the diisocyanate include organic diisocyanates such as 4,4'-diphenylmethane diisocyanate, tolylene diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, xylylene diisocyanate, 2,6-diisocyanatomethyl caproate, and hexamethylene diisocyanate. . Among these diisocyanates, 4,4'-diphenylmethane diisocyanate is particularly preferred. Chain extenders include
Examples thereof include low molecular weight diols, amino alcohols, and triols. As chain extenders, especially 1,4
-Bis (β-hydroxyethoxy) benzene, 1,4-
Butanediol is preferred. The thermoplastic polyurethane elastomer can be used alone, but if desired, a polyisocyanate compound may be added at a ratio of 5 to 30% by weight as disclosed in JP-B-64-8746. Is also good.

As a method for producing a polyurethane nonwoven fabric, a known melt blow method is preferably employed. The ratio α of MD 50% tensile stress and TD 50% tensile stress is 1.1
In order to produce a nonwoven fabric having a directionality of 0 to 2.00, the nozzle itself having pores is reciprocated in the width direction,
In addition, the moving speed of the net conveyor is adjusted to a speed lower than the reciprocating moving speed in the width direction of the nozzle. The web continuously collected by a net conveyor or the like is wound as it is or after embossing to form a nonwoven fabric.

Preferred physical properties and properties of the polyurethane nonwoven fabric used in the present invention are as follows. (1) Basis weight (basis weight): usually 30 to 250 g / m ² , preferably 40 to 150 g / m ² (2) Thickness: usually 100 to 500 μm, preferably 12
0 to 350 μm (3) α value: 1.10 to 2.00, preferably 1.10
(1) 50% tensile stress of MD: preferably 1.2-4.
8N / 19mm, more preferably 1.6-4.0N / 1
9 mm (5) 50% tensile stress of TD: preferably 2.0 to 6.
0N / 19mm, more preferably 2.4-5.5N / 1
9 mm (6) Elongation: Both MD and TD are usually 300% or more, preferably 350% or more. (7) 50% elongation recovery rate: Both MD and TD are usually
90% or more (8) MD breaking strength: usually 6.3 to 32.0 N / 19
mm, preferably 8.0 to 28.0 N / 19 mm (9) TD breaking strength: usually 8.0 to 40.0 N / 19
mm, preferably 10.0 to 36.0 N / 19 mm

In the present invention, the specific polyurethane nonwoven fabric is used as a base material, and an adhesive is applied to one surface of the base material to form an adhesive tape. As the adhesive, for example, acrylic adhesive,
Rubber-based adhesives, silicone-based adhesives, and the like can be given. Among these adhesives, acrylic adhesives are
It is preferable because it has good adhesiveness to the polyurethane nonwoven fabric and is advantageous in cost. In order to prepare an emergency bandage from the pressure-sensitive adhesive tape of the present invention, it is usually punched into a roughly rectangular oval shape, with the long side being the TD of the base material and the short side being the MD of the base material.
To each other. A pad is disposed substantially at the center of the pressure-sensitive adhesive layer. Special woven cloth, gauze,
A nonwoven fabric or the like can be used, and among these, a stretchable knitted fabric having good water absorbency or a stretchable pad obtained by bonding an atlas-knitted net to a stretchable nonwoven fabric is preferable. The pad may be disinfected by infiltrating a disinfectant in advance, or may be subjected to a disinfection treatment after the pad is completed. A release liner may be attached to the surface of the pressure-sensitive adhesive according to a conventional method, and may be packaged one by one. Examples of the release liner include crepe-like cellophane, polyester film, polyolefin-based film subjected to a release treatment, and release paper.

When the long side of the first-aid bandage is matched with the TD of the base material and the short side is matched with the MD of the base material, not only strength in the long side direction but also softness in the short side direction can be obtained. . Since the strength of this emergency bandage is strongly distributed in the long side direction, the basis weight (mass per unit area), which is the basis of the overall strength, can be suppressed in the nonwoven fabric base material. If the fiber diameter of the filaments constituting the nonwoven fabric serving as the base material is reduced, an emergency bandage having a fine surface texture and small thickness unevenness can be obtained. Of course, this nonwoven fabric substrate is excellent in breathability and stretchability. The first-aid bandage using the pressure-sensitive adhesive tape of the present invention is advantageous in terms of cost because it has a good fit and little discomfort, and in particular, can reduce the basis weight of the nonwoven fabric substrate. The first-aid bandage of the present invention, when wrapped around a finger or the like, does not loosen tightly or loosely, and has a moderate feeling.Moreover, as with conventional products, the orientation is relaxed when the temperature rises or undergoes repeated expansion and contraction. Since it shrinks in the direction of the short side and does not expand in the direction of the long side, it is unlikely that loose dropout occurs. In addition, peeling from the edge during attachment is suppressed. ADVANTAGE OF THE INVENTION The first-aid bandage of the present invention has good air permeability, does not disturb skin respiration, and can suppress discomfort due to peeling, growth of various bacteria, and the like.

In the nonwoven fabric used in the present invention, the TD orientation can be easily obtained by reducing the fiber diameter, but the cooling rate of the fiber is increased, so that the heat fusion at the contact point of each fiber (filament) is insufficient. There is. In such a case, the internal strength of the nonwoven fabric can be increased by embossing. As the embossing method, it is preferable to employ a point heating and pressing method. By such embossing, 10 or more heat fusion points can be formed per 1 cm ² to compensate for the lack of internal strength. Moreover, by the embossing, the sliding property of the surface of the first-aid bandage (the back side of the adhesive layer) matches the sliding property of the skin, and the feeling of discomfort when the user wraps around the finger and grasps the object is reduced. When embossing is applied, even if you do not use a binder when manufacturing nonwoven fabric,
Since the internal strength can be increased, a nonwoven fabric preferable as a sanitary material can be obtained.

[0022]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. The measuring method of the physical properties is as follows. (1) Tensile test A tensile test is performed according to JIS K-7113, and 50%
The tensile stress was measured. -Testing machine: Instron type tensile testing machine-Specimen: 19 mm width, 100 mm length, distance between marked lines 5
0 mm strip shape ・ Grip distance: 50 mm ・ Cross head moving speed: 300 mm / min ・ Number of repetition tests: n = 3 ・ Measurement atmosphere: 23 ° C., 65% RH ・ Measuring method of 50% tensile stress: width 19 from sample sheet
mm, 100mm long strip, 50m at the center
After the mark of m is attached and the condition is adjusted for 1 hour or more in that state, it is attached to the crosshead of the Instron type tensile tester at the above-mentioned grip distance of 50 mm. The lower crosshead was lowered at a speed of 300 mm / min, and the test piece was pulled. The load when the tensile length reaches 25 mm is 5
The tensile stress was 0%. Unit of load is Newton (N)
It was expressed by. The MD was cut out long and the measurement result when pulled in that direction was used as MD data. The measurement temperature is
23 ° C. ± 2 ° C. (2) Practical test of first-aid bandage Test subjects: Healthy men and women between the ages of 15 and 50, 100 in total Attached site: Middle finger and ring finger of left and right hands Test method: Distribute each sample to the test subject, and apply 2
Evaluation method: Check each evaluation item shown in Table 3. Application period: 8 hours or more per application

[Example 1] Polyhexamethylenediol having a number average molecular weight of 2000, 4,4-diphenylmethane diisocyanate, and 1,4-butanediol were melt-polymerized in a biaxial polymerization machine to obtain a thermoplastic resin having a Shore A hardness of 90. A polyurethane was obtained. The powdery polyurethane thus obtained was formed into pellets by an extruder. Using the polyurethane elastomer pellets thus produced as a raw material, the polyurethane melt was melted at a melting temperature of 245 ° C. using a melt blow spinning apparatus, and the polyurethane melt was discharged from a group of nozzles having particularly fine pores. The nozzle group constantly reciprocates in the width direction, and the machine speed (moving speed of the net conveyor) is reduced to about 1/5 of the reciprocating speed of the nozzle in the width direction.
Set to. The molten fiber group was dropped on a net conveyor and sheeted to a basis weight of 65 g / m ² . The fiber diameter was in the range of about 7 to 15 μmφ. The obtained web was subjected to heat embossing by a point heat compression method in order to improve the internal strength. The thermocompression bonding spot was set at a pitch of 1.4 mm for both MD and TD.

An acrylic pressure-sensitive adhesive (a copolymer of 87% by weight of 2-ethylhexyl acrylate, 10% by weight of vinyl acetate, and 3% by weight of acrylic acid) was coated on one surface of the polyurethane nonwoven fabric with a perforated coating of 40 g / m ² . Then, a release paper was attached to form an adhesive sheet. Add this adhesive tape to MD for 19
A gauze pad of 13 × 22 mm was placed on the adhesive layer, and the adhesive surface was covered with a product liner to form an emergency plaster. The first-aid bandage obtained in this manner has a fine-grained appearance, is flexible, has excellent breathability and shrinkage, and has a good appearance after application, and tightens tightly when wrapped around a finger. It was good, had good sticking comfort, and had excellent fit. Table 2 shows the physical properties of the nonwoven fabric.

[Examples 2 to 5] By changing the reciprocating speed in the width direction of the nozzle in the width direction, the machine speed, the basis weight of the polyurethane nonwoven fabric and the like as appropriate, a polyurethane nonwoven fabric having physical properties and properties shown in Table 2 was produced. An emergency bandage was prepared in the same manner as in Example 1. However, no embossing was applied. Each first-aid bandage obtained in this way has a fine-grained appearance, is flexible, has excellent breathability, excellent shrinkage, and has a good appearance after application, and when wound around a finger. The tightness of the winding was good, the adhesion was good, and the fit was excellent.

[0026]

[Table 2]

<Practical Test of First Aid Bandage> Practical tests were performed on the first aid bandage obtained in Example 1 and various commercially available first aid bandages. Table 3 shows the results. Table 4 shows the structure and the like of various commercially available products.

[0028]

[Table 3]

[0029]

[Table 4]

[0030]

According to the present invention, a pressure-sensitive adhesive tape which has good appearance and fit, has little discomfort, is tightly wound, has good adhesion during use, and is particularly suitable for emergency bandages, and The used first aid bandage is provided.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiromitsu Fujisawa 2-3-3 Sekiguchi, Bunkyo-ku, Tokyo Nichiban Co., Ltd. (72) Inventor Kunihiro Oyama 2-3-3 Sekiguchi, Bunkyo-ku, Tokyo Nichiban (72) Inventor Naoto Hotta 2-3-3 Sekiguchi, Bunkyo-ku, Tokyo Nichiban Co., Ltd. (72) Inventor Tsutomu Teshima 1-10-20-807 Midoricho, Hofu City, Yamaguchi Prefecture

Claims (5)

[Claims] 1. A pressure-sensitive adhesive tape obtained by applying a pressure-sensitive adhesive to one surface of a non-woven fabric having air permeability and elasticity, wherein the non-woven fabric is a polyurethane non-woven fabric formed from ultra-fine polyurethane filaments having an average fiber diameter of 7 to 15 μm. Characteristic adhesive tape. 2. The machine direction (M
D) 50% tensile stress (x) and 50% in width direction (TD)
The ratio (y / x) to the tensile stress (y) is 1.10 to 2.00
The pressure-sensitive adhesive tape according to claim 1, wherein 3. The pressure-sensitive adhesive tape according to claim 1, wherein the polyurethane nonwoven fabric is embossed by a point heat compression method. 4. An emergency bandage comprising the pressure-sensitive adhesive tape according to claim 1. 5. A substantially rectangular shape having a long side corresponding to T
5. The emergency plaster according to claim 4, wherein the short side is punched out so as to coincide with the MD of the base material.