JP4947939B2 - Medical adhesive tape or sheet - Google Patents

Description

  The present invention relates to a medical pressure-sensitive adhesive tape or sheet, and particularly relates to a medical pressure-sensitive adhesive tape or sheet that has little skin irritation and has hand cutting properties.

  A medical adhesive tape or sheet (hereinafter sometimes referred to as an adhesive tape) generally has a structure in which an adhesive layer is formed on one side of a substrate, and a nonwoven fabric is used as the substrate. There are many adhesive tapes or sheets. Thus, the adhesive tape which a base material consists of a nonwoven fabric is economically cheap, and the thing excellent in characteristics, such as mechanical strength and adhesiveness, exists. However, in many cases, the medical adhesive tape is required to have a hand-cut property that can be cut by hand. Various reports have been made on adhesive tapes with improved handcut performance.

  In Japanese Patent Publication No. 3431628, pattern embossing is performed on a fibrous web in which stretchable non-destructive staple fibers and binder fibers are irregularly woven and knitted, and internally bonded uniformly by a chemical binder, thereby being wet. A nonwoven sheet material is disclosed which exhibits dry strength and excellent hand measurements and can be easily torn in a direction perpendicular to the web direction with a finger. Japanese Patent Publication No. 9-502111 discloses a series of about 0.2-5 mm perforations divided by connecting segments of about 0.1-1 mm on an adhesive tape having a binder-containing nonwoven web as a support. It is disclosed that it can be easily torn by hand. Japanese Patent Laid-Open No. 2002-526667 proposes a laminated composite material in which a nonwoven fiber, a scrim in contact with a filament stretched vertically and horizontally, and a binder are combined. In JP-A-2002-360625, the support is a polyolefin nonwoven fabric, and a large number of through or non-penetrating micropores are formed, and the nonwoven fabric fibers around each micropore are melted to form a film. An adhesive tape for skin application is disclosed.

  In general, a nonwoven fabric pressure-sensitive adhesive sheet is difficult to cut by hand, and even if it can be cut, the cut surface is often cut in an irregular state. As described above, there are many proposals of the pressure-sensitive adhesive tape to which the hand cutting property is imparted, but there is no example in which the state of the cut surface when cut by hand is strictly evaluated. Ideally, a plastic film that has been perforated is cut straight, and the cut surface is clean, but it still meets such requirements. There is no tape. Moreover, in order to be used as a medical use, it is also necessary to be an adhesive sheet with little skin irritation.

Japanese Patent Publication No. 3431628 JP-T 9-502111 JP-T-2002-526667 JP 2002-360625 A

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a medical pressure-sensitive adhesive tape or sheet having excellent hand-cutability in both vertical and horizontal directions.

The medical pressure-sensitive adhesive tape or sheet of the present invention is a medical pressure-sensitive adhesive tape or sheet having a pressure-sensitive adhesive layer on at least one side of a base material made of a nonwoven fabric, and the nonwoven fabric has a longitudinal to lateral strength ratio of 1: 4 to In the range of 2: 1, through holes penetrating the base material and the adhesive layer are provided at regular intervals, and the area of the through holes is 0.1 mm ² or more and 2.0 mm ² or less. It is characterized by that.

Here, it is preferable that the shape of the through hole is a shape having an angle of 90 degrees or less in at least one place.
Moreover, it is preferable that the shape of the said through-hole is a shape which has two angles of 90 degrees or less in at least one direction of the vertical direction and a horizontal direction.

  In the present invention, it is preferable that the through holes are arranged so that tip portions having an angle of 90 degrees or less in at least one of the vertical direction and the horizontal direction are substantially aligned.

  In the present invention, the shape of the through hole may be a quadrangle.

  In the present invention, the shape of the through hole is preferably a shape having an acute angle portion at least in the lateral direction.

  Moreover, it is preferable that the space | interval of the said through-holes is 0.5 mm or more and 3.0 mm or less by the distance between the center points of an adjacent through-hole.

In the present invention, the base material is preferably impregnated with an acrylic resin.
Moreover, it is preferable that the peeling process is given to the surface on the opposite side to the surface which provided the said adhesive layer of the said base material.

  In the present invention, the medical adhesive tape or sheet can be wound and stored in a roll form.

  ADVANTAGE OF THE INVENTION According to this invention, the medical adhesive sheet excellent in the hand cutting property in both the vertical and horizontal directions can be provided.

BEST MODE FOR CARRYING OUT THE INVENTION

  The medical adhesive tape or sheet of the present invention has an adhesive layer on at least one surface of a substrate. This base material consists of a nonwoven fabric. The nonwoven fabric used in the present invention may be a chemical synthetic fiber or a fiber other than that, and is not particularly limited, such as fiber length and fiber diameter. Nonwoven fabrics, for example, natural fibers such as cotton, hemp, wool, etc., regenerated fibers such as rayon and cupra, semi-synthetic fibers such as acetate and promix, nylon, polyester, acrylic, vinylon, polyvinyl chloride, vinylidene, polyolefin Synthetic fibers such as polyurethane clar, fluorocarbon and novoloid, glass fibers, carbon fibers, alumina fibers, silicon carbide fibers, slag fibers, metal fibers and other inorganic fibers, wood pulp, and the like are used. From the viewpoint of easiness of procurement, stability and the like, it is preferable to use pulp fibers, polyester fibers and the like.

  The method for forming the nonwoven fabric is not particularly limited, and a general nonwoven fabric manufacturing method can be adopted. For example, in terms of dry manufacturing methods, adhesive-type dipping methods, printing methods, spraying methods, powder methods, thermal bond methods, etc., mechanical-bonded felt methods, stitch methods, needle punch methods, hydroentangled spunlaces Examples include spinning method, spinning type spunbonding method, netting method, melt-blowing method, film method, etc. Speaking of wet production methods, hydroentangled spunlace method, spinning method spunbond method, flash method, papermaking method Examples thereof include a heat-bonding fiber method, a thermocompression bonding method, and an adhesive method.

  Any material can be used as a material for forming the nonwoven fabric, but pulp fibers having a high melting point and hygroscopicity, polyester fibers having a good texture and high strength, and the like are preferably used.

The basis weight of the whole nonwoven fabric in the present invention is ^{preferably 10g / m 2 ~80g / m 2} , in consideration of the texture and mechanical strength, it basis weight is ^12g / ^{m 2 ~60g} / m 2 Further preferred.

The nonwoven fabric after the formation of through-holes according to the present invention needs to have an aspect ratio of 1: 4 to 2: 1, preferably 1: 2 to 1: 1. Here, the strength refers to the breaking strength. For example, with an autograph AG-ISIKN manufactured by Shimadzu Corporation, until a 10 mm wide sample is set at a distance between chucks of 100 mm and pulled at a speed of 300 mm / min, until it breaks. Can be obtained by measuring the stress.
In addition, the longitudinal length-to-width strength ratio refers to the flow direction of the nonwoven fabric (longitudinal direction in the case of a long length), and the width refers to a direction perpendicular to the flow direction, that is, the width direction of the nonwoven fabric.

  The nonwoven fabric is preferably treated with a chemical binder. Common chemical binders can be used as chemical binders, which can realize softness with little chemical skin irritation, no discomfort to the skin, and moisture permeability If it is, it can be used without particular limitation.

  Examples of the chemical binder used include acrylic resin, vinyl acrylic resin, acetate / ethylene, and polyvinyl acetate. Also, latexes bonded with acrylic resins, styrene / butadiene rubber, vinyl acetate / ethylene, vinyl acetate / acrylates, polyvinyl chloride, polyvinyl alcohols, polyurethanes, vinyl acetates, acrylic / vinyl acetate, and similar Examples of water-based chemical binders include acrylic latex binders, styrene / butadiene rubber latex, acrylic / vinyl acetate copolymer latex, and the like.

For example, a water-based chemical binder can be applied to the nonwoven using a wire wound rod, kiss roll, reverse roll, gravure roll, air knife, spray, and the like.
The amount of the chemical binder used is preferably appropriately determined according to desired properties, for example, mechanical strength (drying temperature, wet strength), tear properties, etc., but generally about 3 g it is preferably in the range of / ^{m 2} ~ about 50 g / ^{m 2,} and still more preferably in the range of about ^{5g / m 2 ~35g / m 2} .

  In the present invention, it is preferable to apply a backside treatment after applying a chemical binder to the nonwoven fabric. By performing the back surface treatment, the medical pressure-sensitive adhesive sheet of the present invention can be smoothly rewound even when it is stored in a wound state, that is, in the form of a scroll. For example, it is preferable to perform the back treatment by applying a back treatment agent such as silicone, fluorine, or wax. The amount of the back surface treatment agent used is preferably determined as appropriate in consideration of the type of pressure-sensitive adhesive.

  The substrate made of the nonwoven fabric has through holes at regular intervals. In addition, it is necessary that this through hole also penetrates the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer may be partially provided on the substrate having the through-hole so as to avoid the through-hole, Or a through-hole may be formed after an adhesive layer is provided. Such a through hole will be described later.

  The medical pressure-sensitive adhesive tape or sheet of the present invention has a pressure-sensitive adhesive layer on one surface of the substrate. For example, an adhesive layer is provided on the surface opposite to the surface coated with the chemical binder of the nonwoven fabric. The pressure-sensitive adhesive layer is flexible enough to follow the skin, has little irritation to the skin (chemical irritation, physical irritation), and preferably has moisture permeability, and uses an adhesive that satisfies such requirements. It is preferable to be formed. As an adhesive, the adhesive generally used for the adhesive tape for skin sticking etc. can be used without being specifically limited. For example, synthetic rubber-based pressure-sensitive adhesives mainly composed of styrene-isobutylene-styrene copolymer, polyurethane-based pressure-sensitive adhesives, polysiloxane-based pressure-sensitive adhesives, natural rubber-based pressure-sensitive adhesives, polyether-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, etc. One kind or a mixture of two or more kinds can be used. The pressure-sensitive adhesive layer may be provided before the through hole is formed in the nonwoven fabric, or may be provided after the through hole is formed. Such a through hole will be described later.

  For the pressure-sensitive adhesive, if necessary, a water-soluble or water-absorbing resin such as a plasticizer represented by polyhydric alcohols such as glycerin, polyethylene glycol, and polypropylene glycol, a polyacrylic acid, a cross-linked polyacrylic acid, and polyvinylpyrrolidone Various additives such as rosin-based, terpene-based, petroleum-based tackifiers, various softeners, fillers, pigments, and the like can be blended.

  The thickness of the pressure-sensitive adhesive layer is preferably 10 to 100 μm, and preferably 20 to 70 μm. When the thickness of the pressure-sensitive adhesive layer is 10 μm or more, sufficient adhesiveness is exhibited while being adhered to the skin. Moreover, if the thickness is 100 μm or less, the water vapor permeability required for the adhesive tape for skin application can be obtained, so that sweat resistance can be imparted. Is not expressed.

  The pressure-sensitive adhesive layer may be provided directly on one side of the substrate, for example, the side opposite to the side to which the nonwoven fabric chemical binder is applied, or may be provided indirectly. Here, “indirect” does not directly contact the adhesive layer to the base material, for example, after applying a primer to the surface of the base material in order to improve anchorage with the adhesive layer, This refers to forming an adhesive layer.

Moreover, the adhesive layer may be provided in the whole surface of one side of a base material, and may be provided partially. When a pressure-sensitive adhesive layer is partially provided, it may be provided in a streak shape having a constant width or may be provided in a wavy shape. The pressure-sensitive adhesive layer may be a laminate of two or more layers. In this case, for example, one pressure-sensitive adhesive layer having different adhesive strength can be provided on the entire surface, and the other pressure-sensitive adhesive can be partially provided on the surface.
The pressure-sensitive adhesive layer may be formed by applying a pressure-sensitive adhesive in a solution, or by emulsion coating or hot-melt coating.

  The medical pressure-sensitive adhesive tape or sheet of the present invention has holes penetrating the base material and the pressure-sensitive adhesive layer, and these holes are preferably provided at regular intervals both in the vertical direction and in the horizontal direction. The shape of the hole (through hole) is preferably a shape having an angle of 90 degrees or less in at least one place. Moreover, it is preferable that two places of the angle of 90 degrees or less exist in at least one direction of the vertical direction and the horizontal direction of a nonwoven fabric, and it is still more preferable to exist in at least a horizontal direction. Moreover, it is preferable that these two tip portions are arranged so as to be substantially aligned. For example, examples of the shape of the through hole include a square such as a positive direction, a rectangle, a rhombus, and a parallelogram, a shape like a cross shuriken, and a polygon like a abacus ball. The length ratio of the rectangular vertical and horizontal diagonal lines, the vertical and horizontal length ratio of the cross shuriken, and the like can be appropriately designed.

Although it is preferred that the size of the through-hole is appropriately designed, it is preferable area of the through-holes is in the range of 0.1mm ² ~2.0mm ^2. If the area of the hole is less than 0.1 mm ² , the air permeability may not be sufficiently improved, and sufficient hand cutting may not be obtained. On the other hand, when the area of the hole is larger than 2.0 mm ² , the strength of the obtained sheet may be lowered or sufficient adhesiveness may not be obtained.

  About the space | interval which a through-hole is arrange | positioned, it is preferable that the distance (pitch) between the center points of the adjacent through-holes is 0.5 mm or more and 3.0 mm or less, 0.75 mm or more and 2.5 mm. More preferably, it is as follows. If the distance between the center points of adjacent holes is less than 0.5 mm, sufficient strength may not be imparted to the resulting sheet, whereas if it exceeds 3.0 mm, the air permeability may not be sufficiently improved. In some cases, sufficient hand cutting performance cannot be realized. Note that the vertical and horizontal pitches do not need to be the same. For example, in the case where the nonwoven fabric is surely provided with lateral hand cutability, the vertical pitch may be larger than the horizontal pitch. .

  The medical pressure-sensitive adhesive tape or sheet of the present invention has a through-hole penetrating the base material and the pressure-sensitive adhesive layer, and this through-hole is formed by, for example, die roll cutting by a blade, cutting by laser irradiation, or perforation formation by a metal roll. And so on. For example, when forming a through-hole using a metal roll, a metal roll having a through-hole-shaped protrusion (a perforated roll) and a pressure roll (a metal roll having a smooth surface) are opposed to each other, A through-hole can be formed in the nonwoven fabric or the like by passing a nonwoven fabric or a nonwoven fabric having an adhesive layer between the contact surfaces of both rolls. The metal roll has protrusions for forming holes at regular intervals, and the tip of the protrusion may be pointed (for example, a square bottom having a square shape, a rhombus, etc.), or the tip of the protrusion may be A flat shape may be used. The metal roll is preferably heated to about 120 ° C to about 400 ° C, more preferably about 150 ° C to about 350 ° C, and the pressure roll is heated to about 50 ° C to about 150 ° C. Preferably it is.

The pressure applied between the metal roll and the pressure roll (crimping force) and the speed at which the nonwoven fabric is passed (flow speed) are determined by taking into consideration the shape of the protrusion, the temperature of the protrusion, the thickness of the nonwoven fabric, etc. It is preferable to set so that a suitable through-hole is formed, etc., but in general, the crimping force is preferably about 10 kg / cm to about 200 kg / cm in terms of linear pressure. It is preferred that the speed is from about 1 m / min to about 50 m / min.
As the pressure roll, a stainless steel roll having a smooth surface, a rubber roll having a smooth surface obtained by coating a core metal with silicone rubber, and the like can be used.

  In the present invention, the through hole may be formed after the pressure-sensitive adhesive layer is formed on the base material, or the pressure-sensitive adhesive layer may be provided after the through-hole is formed in the base material. In the former case, a through hole penetrating the base material and the pressure-sensitive adhesive layer can be formed by using the base material having the pressure-sensitive adhesive layer, for example, using a metal roll. In the latter case, if necessary, a through hole is formed in the base material treated with a chemical binder by the above method, and then an adhesive layer is provided so as not to block the through hole. For example, the pressure-sensitive adhesive layer can be formed on the base material in a striped manner avoiding the through holes, or the pressure-sensitive adhesive layer can be partially formed.

  The through-hole pattern of the medical adhesive tape or sheet | seat of this invention is demonstrated concretely using drawing. FIG. 1A is a diagram showing a first aspect of the through-hole pattern, in which squares are arranged in rows and columns and corners are arranged vertically and horizontally. Yes. FIG. 1 (b) is a diagram showing a second mode of the through hole pattern, in which the holes of the cross shuriken are arranged in rows and columns, and the tip of the cross is positioned vertically and horizontally. Are arranged to be. FIG. 1C is a diagram showing a third aspect of the through-hole pattern. Here, the horizontally long rectangles are arranged in rows and columns, and the corners are arranged vertically and horizontally. ing. FIG. 2A illustrates a through-hole pattern outside the present invention, and a part of the through-hole shown in FIG. 1A is buried, that is, a part of the square is missing. This is a state in which the intervals of the squares arranged in rows and columns are not constant.

  In addition, in (a) of FIG. 1-(c) of FIG. 1, the aspect arrange | positioned in the state from which the through-hole and the through-hole adjoined was shown, but between a through-hole and a through-hole is shown. It may be arranged in a more distant state, or may be arranged in a state where the through hole and the through hole are closer to each other.

  The through holes are formed on the adhesive tape at regular intervals. For example, in at least one of the columns (flow direction and longitudinal direction of the nonwoven fabric) and rows (direction perpendicular to the flow direction and width direction), the through holes and This means that the distance from the through hole is constant. The interval between the non-cut portions between the through-holes and the through-holes in the row where hand cutting is required is preferably determined as appropriate depending on the shape, size, etc. of the through-holes. For example, FIG. When the through holes are arranged as shown in 1 (c), the interval (C, D) between the non-cut portions is preferably in the range of about 0.25 mm to 1.25 mm.

  The medical pressure-sensitive adhesive tape or sheet of the present invention may have a release sheet on the pressure-sensitive adhesive layer in order to protect the pressure-sensitive adhesive layer. As the release sheet, it is possible to use a release sheet that has been subjected to release treatment with silicone or the like on the side in contact with the pressure-sensitive adhesive layer. Alternatively, the medical pressure-sensitive adhesive tape or sheet can be in a roll state. In this case, it is preferable to perform surface treatment on the surface to which the chemical binder is applied as described above.

  Since the medical pressure-sensitive adhesive tape or sheet of the present invention has the above-described configuration, it can be torn by hand without using a cutting tool such as scissors, and the skin is less irritating and stuffy. Nor. Therefore, it is effective for medical use.

In this invention, medical tapes and sheets, such as a bandage, can be formed using this medical adhesive tape. For example, a medical adhesive sheet is cut to an appropriate size to form a bandage, taping tape, etc., or a covering material for covering a wound part, a post-surgical patch, a catheter needle insertion part, gauze, etc. Form medical tapes or sheets such as cover materials, or form medical products such as fixing tapes, bathing pouch fixing tapes, and instrument holding tapes by combining medical adhesive tapes with other supports. Can do. In addition, it goes without saying that the adhesive tape or sheet for skin application of the present invention can be used other than the above medical applications as long as it is applied to the skin.

  The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to these examples, and various applications are possible without departing from the technical idea of the present invention. In the following examples, “part” means “part by weight”, and “%” means “% by weight”. The evaluation methods used in the following examples are shown below.

(Evaluation method for hand cutting)
The medical adhesive tape was torn with a finger to a length of 25 mm in the flow direction and in a direction perpendicular to the flow direction (width direction). The tear direction was assumed to be an ideal cutting line, and the distance at which the cut edge of this cut surface was farthest from the ideal cutting line was determined. That is, for example, when tearing in the flow direction, the maximum length of the length to the cut edge of the adhesive tape extending in the direction perpendicular to the flow direction was measured. The shorter this length, the better the hand cutting ability. The said operation was performed 5 times and the average value was calculated | required.

Example 1
Pulp fibers and polyester fibers were mixed at a weight ratio of 40:60 to obtain mixed fibers. This mixed fiber was made into paper by a wet method to produce a nonwoven fabric. However, in order to add strength, 30 g / m ² of an acrylic resin was contained. The obtained nonwoven fabric had a basis weight of 50 g / m ² . The nonwoven fabric had a longitudinal / lateral strength ratio of 1.30: 1.00.

  On the other hand, in a nitrogen gas atmosphere, a monomer mixture consisting of 95 parts of 2-ethylhexyl acrylate and 5 parts of acrylic acid was dissolved and mixed uniformly in 80 parts of ethyl acetate. To this, 0.2 part of benzoyl peroxide (BPO) was added as a polymerization initiator and a copolymerization reaction was carried out to obtain an acrylic copolymer.

  For 100 parts of this acrylic copolymer, 67 parts of sorbitan trioleate and 0.14 part of a trifunctional isocyanate compound (manufactured by Nippon Polyurethane Industry Co., Ltd., Coronate HL) as a crosslinking agent are placed in an ethyl acetate solvent. Mixed and dissolved. The resulting solution was applied to the silicone-treated surface of a release paper having a silicone treatment on one side so that the thickness after drying was 50 μm, dried at 100 ° C. for 3 minutes, and then a crosslinked adhesive. A layer was formed.

  Next, after the formed pressure-sensitive adhesive layer was bonded to the formed nonwoven fabric and pressure-bonded, it was further aged (aged) at 60 ° C. for 72 hours to produce a laminate having the pressure-sensitive adhesive layer on the substrate. .

Holes were formed in the laminate having the produced pressure-sensitive adhesive layer. That is, as shown in FIG. 1 (a), a metal roll provided with a quadrangular pyramid-shaped protrusion that forms a quadrilateral having a 90-degree angle vertically and horizontally (the length of the diagonal line is 1.0 mm × 1. 0 mm, pitch (distance between center points) (longitudinal direction B = 1.5 mm, lateral direction A = 1.5 mm) is set to 150 ° C., and a flat metal roll having a smooth surface is set to 100 ° C. The non-woven fabric was passed between the roll and the metal flat roll under pressure at a linear pressure of 180 kg / cm and a speed of 0.5 m / min, thereby penetrating with a diameter of X = 0.8 mm and Y = 0.8 mm. An adhesive tape having holes was produced.
About the obtained adhesive tape, hand-cut property was evaluated. The results are shown in Table 1.

(Example 2)
In Example 1, the metal roll was provided with a protrusion capable of forming a cross shuriken shape as shown in FIG. 1B (vertical length 1.0 mm, horizontal length 1). Adhesive tape having through holes (X = 0.8 mm, Y = 0.8 mm) in the same manner as in Example 1 except that the pitch was changed to 0.0 mm and the pitch (A = 1.5 mm, B = 1.5 mm). Was made.
About the obtained adhesive tape, hand-cut property was evaluated. The results are shown in Table 1.

(Comparative Example 1)
In Example 1, a pressure-sensitive adhesive tape having non-through holes was produced in the same manner as in Example 1 except that, when forming holes in the laminate, pressure bonding was performed at a linear pressure of 50 kg / cm and a speed of 0.5 m / min. .
About the obtained adhesive tape, hand-cut property was evaluated. The results are shown in Table 1.

(Comparative Example 2)
In Example 1, the metal roll was provided with a quadrangular pyramidal projection capable of forming a quadrangle as shown in FIG. 2 (a) (vertical length 0.5 mm, horizontal length). A through hole (as in Example 1) except that the thickness was changed to 0.5 mm and the pitch (B = 1.0 mm, B ₁ = 2.0 mm, A = 1.0 mm, A ₁ = 2.0 mm). An adhesive tape having X = 0.4 mm, Y = 0.4 mm) was produced.
About the obtained adhesive tape, hand-cut property was evaluated. The results are shown in Table 1.

(Comparative Example 3)
In Example 1, an acrylic resin was used in the same manner as in Example 1 except that a mixed fiber in which pulp fiber and vinylon were mixed at a weight ratio of 70:30 was used instead of the nonwoven fabric composed of pulp fiber / polyester fiber. A nonwoven fabric containing was prepared. The obtained nonwoven fabric had a longitudinal / lateral strength ratio of 4.00: 1.00.
Moreover, the laminated body which has an adhesive layer was formed like Example 1, and the adhesive tape which has a through-hole similarly to Example 1 was produced. The resulting adhesive tape was evaluated for hand cutting properties. The results are shown in Table 1.

(Comparative Example 4)
In Example 1, the metal roll is a metal roll having a square pyramid-shaped protrusion that can form a quadrangle as shown in FIG. 2B (vertical length 1.0 mm, horizontal The length was changed to 1.0 mm and the pitch (A = 1.00 mm, B = 1.00 mm)), and the laminate was placed between the metal roll (150 ° C.) and the rubber roll (room temperature) with a linear pressure of 50 kg / A pressure-sensitive adhesive tape having through-holes (diameters X = 0.2 mm, Y = 0.2 mm) was produced in the same manner as in Example 1 except that crimping was performed at a speed of 12 cm / min.
About the obtained adhesive tape, hand-cut property was evaluated. The results are shown in Table 1.

As is clear from Table 1, it was found that the adhesive tapes of Examples 1 and 2 exhibited excellent hand cutting properties in both the vertical and horizontal directions.
On the other hand, it was found that the adhesive tapes of Comparative Examples 1 and 4 were both inferior in hand cutting properties because both the vertical and horizontal hand cutting properties were 2.0 or more. In addition, the adhesive tape of Comparative Example 2 in which the arrangement of the through-holes is not fixed and the adhesive tape of Comparative Example 3 in which the longitudinal / lateral strength ratio of the nonwoven fabric is outside the conditions of the present invention are either vertically or horizontally hand-cut. Was found to be 2.0 or more.
That is, according to this invention, it turned out that the adhesive tape excellent in hand-cut property can be implement | achieved in any of the vertical and horizontal directions.

  The medical pressure-sensitive adhesive tape or sheet of the present invention can be used in the form of sheets and tapes of various sizes, and can also be stored in a roll form. These medical adhesive tapes or sheets can be used in the fields of skin application, for example, medical hygiene field, external use, etc., and specifically, suitable for adhesive bandages, adhesive bandages, dressing materials, taping tapes, etc. Used for.

(A) is a figure which shows the 1st aspect of the through-hole pattern of the medical adhesive tape or sheet | seat of this invention, (b) is the 2nd aspect of the through-hole pattern of the medical adhesive tape or sheet | seat of this invention. (C) is a figure which shows the 3rd aspect of the through-hole pattern of the medical adhesive tape or sheet | seat of this invention. (A) is a figure which shows the through-hole pattern of the adhesive tape of the comparative example 2, (b) is a figure which shows the through-hole pattern of the adhesive tape of the comparative example 4.

Explanation of symbols

X Vertical length of the through hole Y Horizontal length of the through hole A, A ₁ Distance between the center points of the through holes in the horizontal direction (pitch)
B, B ₁ Distance between the center points of the vertical through holes (pitch)

Claims (10)

A medical pressure-sensitive adhesive tape or sheet having a pressure-sensitive adhesive layer on at least one surface of a substrate made of nonwoven fabric, wherein the longitudinal-lateral strength ratio of the nonwoven fabric after forming the through-hole is in the range of 1: 4 to 2: 1. a through hole passing through the adhesive layer is, in the interval between the columns and rows of at least one through the column hole and the through hole is provided to be constant, outside of the substrate of the through hole A medical pressure-sensitive adhesive tape or sheet, wherein the surface side area is 0.10 mm ² or more and 2.00 mm ² or less, and the base material contains an acrylic resin as a chemical binder. The medical adhesive tape or sheet according to claim 1, wherein the shape of the through hole is a shape having a tip portion having an angle of 90 degrees or less at at least one place. The medical adhesive tape or sheet according to claim 2, wherein the shape of the through hole is a shape having two tip portions having an angle of 90 degrees or less in at least one of the vertical direction and the horizontal direction.   4. The medical pressure-sensitive adhesive tape according to claim 3, wherein the through-holes are arranged so that tip portions having an angle of 90 degrees or less in at least one of the vertical direction and the horizontal direction are substantially aligned. Or a sheet.   The medical adhesive tape or sheet according to any one of claims 1 to 4, wherein the shape of the through hole is a quadrangle.   The medical adhesive tape or sheet according to any one of claims 1 to 4, wherein the shape of the through hole is a cross shuriken shape.   The medical pressure-sensitive adhesive tape or sheet according to any one of claims 1 to 6, wherein the shape of the through hole is a shape having an acute angle portion in at least the lateral direction.   The medical adhesive tape according to any one of claims 1 to 7, wherein an interval between the through holes is 0.5 mm or more and 3.0 mm or less as a distance between the center points of adjacent through holes. Or a sheet.   The medical pressure-sensitive adhesive tape or sheet according to any one of claims 1 to 8, wherein a surface of the substrate opposite to the surface on which the pressure-sensitive adhesive layer is provided is subjected to a peeling treatment. .   The medical adhesive tape or sheet according to any one of claims 1 to 9, wherein the medical adhesive tape or sheet is wound and stored in a roll form.

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