WO2019168019A1 - 絆創膏及び絆創膏用ポリウレタン不織布 - Google Patents
絆創膏及び絆創膏用ポリウレタン不織布 Download PDFInfo
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- WO2019168019A1 WO2019168019A1 PCT/JP2019/007529 JP2019007529W WO2019168019A1 WO 2019168019 A1 WO2019168019 A1 WO 2019168019A1 JP 2019007529 W JP2019007529 W JP 2019007529W WO 2019168019 A1 WO2019168019 A1 WO 2019168019A1
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- adhesive
- nonwoven fabric
- bandage
- adhesive bandage
- embossed
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/02—Adhesive plasters or dressings
- A61F13/0246—Adhesive plasters or dressings characterised by the skin adhering layer
- A61F13/0256—Adhesive plasters or dressings characterised by the skin adhering layer characterized by the parametric properties of the adhesive
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/02—Adhesive plasters or dressings
- A61F13/023—Adhesive plasters or dressings wound covering film layers without a fluid handling layer
- A61F13/0243—Adhesive plasters or dressings wound covering film layers without a fluid handling layer characterised by the properties of the skin contacting layer, e.g. air-vapor permeability
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/02—Adhesive plasters or dressings
- A61F13/0269—Tapes for dressing attachment
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4326—Condensation or reaction polymers
- D04H1/4358—Polyurethanes
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/009—Condensation or reaction polymers
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F2013/00089—Wound bandages
- A61F2013/00238—Wound bandages characterised by way of knitting or weaving
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F2013/00089—Wound bandages
- A61F2013/00314—Wound bandages with surface treatments
- A61F2013/00327—Wound bandages with surface treatments to create projections or depressions in surface
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F2013/00361—Plasters
- A61F2013/00855—Plasters pervious to air or vapours
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2509/00—Medical; Hygiene
- D10B2509/02—Bandages, dressings or absorbent pads
- D10B2509/022—Wound dressings
Definitions
- the present invention relates to a bandage and a polyurethane non-woven fabric for bandages, which are medical adhesive products used for protecting affected areas and wounds, and fixing gauze, absorbent cotton, catheters, tubes, and shipping agents to the skin surface.
- the present invention relates to an emergency bandage having a wound-protection pad used for the purpose of protecting wounds such as cuts, scratches, scratches, scratches, shoe slips, promoting healing, and reducing pain.
- Adhesive plaster generally has a configuration in which an adhesive layer is provided on one side of a support made of paper, cloth, plastic film or the like.
- a soft vinyl chloride film is widely used as a support for emergency bandages because it is excellent in toughness, stress relaxation, printability and the like and is inexpensive.
- such a plastic film does not have sufficient fit to the skin surface, and is insufficient in flexibility and breathability.
- non-woven fabrics are excellent in breathability and are not easily stuffy when applied, and are therefore suitable as a support for adhesive bandages that are medical adhesive products.
- stretchable nonwoven fabrics made of polyurethane and polyester have been developed.
- nonwoven fabrics that have both stretchability and breathability as a support for adhesive bandages, rashes, itchiness, erythema, etc.
- it is possible to obtain a bandage that is less likely to cause skin damage and that can follow the movement of the applied skin see, for example, Patent Documents 1 and 2).
- adhesive bandages using a polyurethane nonwoven fabric excellent in breathability and stretchability as a support have excellent characteristics (see, for example, Patent Documents 3 and 4).
- the present applicants have described that in a substantially rectangular first-aid adhesive bandage composed of an adhesive tape in which an adhesive is applied to one side of a non-woven fabric base material having air permeability and stretchability, (1) the nonwoven fabric has an average fiber diameter of 7 to 15 ⁇ m.
- the ratio (y / x) of 50% tensile load (x) in the machine direction (MD) to 50% tensile load (y) in the width direction (CD) formed from ultrafine polyurethane filaments of 1.10 to It is a polyurethane non-woven fabric within the range of 2.00, and (2) it is punched by making the long side of the substantially rectangular shape coincide with the CD of the base material and the short side with the MD of the base material.
- This emergency bandage has good fit and little discomfort, especially because it can keep the basis weight of the nonwoven fabric low, which is advantageous in terms of cost, and when wrapped around a finger etc., the tightness is tight or loose. It is moderate, and as with conventional products, the orientation relaxes when the temperature rises or is repeatedly stretched and shrinks in the short side direction and does not stretch in the long side direction, so it is loose. It is less likely to come off, and the peeling from the edge is suppressed at the time of sticking, the air permeability is good, the skin respiration is not disturbed, and the discomfort due to peeling, etc., and the growth of various bacteria can be suppressed. The excellent effect is obtained (see Patent Document 3).
- Japanese Patent Laid-Open No. 2-14059 Japanese Patent Laid-Open No. 9-560 Japanese Patent Laid-Open No. 10-33585 Japanese Patent Laid-Open No. 11-9623
- the object of the present invention is to provide a self-backing adhesiveness, drying property, air permeability, interlayer by appropriately embossing the support surface in an adhesive bandage using an ultrafine urethane nonwoven fabric excellent in breathability and stretchability as a support.
- the object of the present invention is to provide a bandage such as an emergency bandage in which various required characteristics such as strength are well balanced.
- the present inventors examined further improvements of the invention according to Patent Document 3, and in particular, examined the conditions for embossing.
- various properties required for adhesive bandages using the nonwoven fabric as a support are improved, and some are reduced. I found that it was in a trend.
- the gist of the present invention is as follows.
- the polyurethane nonwoven fabric In the polyurethane nonwoven fabric, at least one of the surfaces is embossed, the water retention ratio per weight is 0.8 or less, the airflow resistance value is 1.6 kPa ⁇ s / m or less, and the machine direction A polyurethane non-woven fabric for bandages, wherein the ratio (Y / X) of 30% tensile load (X) of (MD) to 30% tensile load (Y) in the width direction (CD) is 1.0 to 2.0.
- the adhesive bandage according to the present invention is excellent in flexibility and stretchability derived from an ultra-fine urethane nonwoven fabric, 1.
- One embodiment of the adhesive bandage of the present invention comprises a support layer (a1) comprising a non-woven fabric formed of ultrafine urethane filaments embossed on one side and a breathability laminated on the surface opposite to the embossed side. And an adhesive layer (adhesive tape) having an elongated shape.
- Another embodiment is a so-called emergency adhesive bandage that further includes a pad layer (b) in the approximate center of the pressure-sensitive adhesive layer in a fixed length section of the adhesive bandage.
- This emergency bandage may further include a release sheet (c).
- the support layer (a1), the pressure-sensitive adhesive layer (a2), the pad layer (b), and the release sheet (c) constituting the adhesive bandage of the present invention will be described in detail.
- the support layer includes a non-woven fabric obtained by forming ultrafine urethane filaments under specific conditions and embossed under specific conditions.
- “nonwoven fabric formed by forming ultrafine urethane filaments under specific conditions” and “nonwoven fabric formed from ultrafine urethane filaments” are also simply referred to as “ultrafine urethane nonwoven fabric”.
- the fiber diameter of the ultrafine urethane filament used for forming the ultrafine urethane nonwoven fabric in the present invention is preferably 7 to 25 ⁇ m, more preferably 10 to 18 ⁇ m.
- the ultra-fine urethane nonwoven fabric in the present invention can be suitably obtained by a method of forming a nonwoven fabric by a melt blow method using a thermoplastic polyurethane elastic body capable of melt spinning.
- the thermoplastic polyurethane elastomer comprises a polyol (for example, polyhexamethylene diol), a diisocyanate (for example, 4,4′-diphenylmethane diisocyanate), and a low molecular diol (for example, 1,4-butanediol) to be a hard segment. Obtained by melt polymerization as a raw material.
- polyol-based soft segment as a raw material for the thermoplastic polyurethane elastomer
- examples of the polyol-based soft segment as a raw material for the thermoplastic polyurethane elastomer include low melting point polyols having a number average molecular weight of 500 to 6,000, such as dihydroxy polyether, dihydroxy polyester, dihydroxy carbonate, and dihydroxy polyester amide.
- polyether soft segment polytetramethylene glycol is usually used.
- diisocyanate examples include 4,4′-diphenylmethane diisocyanate, tolylene diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, xylylene diisocyanate, 2,6-diisocyanate methyl caproate, hexamethylene diisocyanate, and the like.
- chain extender hard segment
- a low molecular diol, amino alcohol, triol and the like are used.
- a synthetic resin such as a thermoplastic elastomer is melted, and the melt is discharged from a nozzle-like die having a large number of pores, blown off with a high-speed heated gas, collected by a net conveyor, and collected into an ultrafine urethane. It is made of non-woven fabric.
- the endless net conveyor is moved in the flow direction (MD) of the ultra-fine urethane nonwoven fabric.
- the web collected on the net conveyor is pressed with a roller as necessary, and wound as an ultrafine urethane nonwoven fabric.
- the ultra-fine urethane nonwoven fabric obtained by such a production method is not less oriented in the product flow direction (MD).
- the die is reciprocated in the width direction (CD) during the production of the ultra-fine urethane nonwoven fabric by the melt blow method in order to have the orientation in the direction (width direction: CD) perpendicular to the product flow direction (MD). It is preferable to adopt a method in which the moving speed in the flow direction (MD) of the net conveyor is adjusted to a speed slower than the reciprocating speed in the die width direction.
- the moving speed of the net conveyor in the flow direction (MD) is preferably 1/3 or less, more preferably 1/25 to 1/3, particularly preferably 1/0 of the reciprocating moving speed in the die width direction (CD). 20 to 1/5.
- a well-known apparatus and method can be employ
- the embossing method for example, a point heat pressing method can be employed.
- the internal strength of the ultrafine urethane nonwoven fabric can be supplemented.
- corrugations are formed in the at least single side
- an embossing roll with an irregular pattern on the surface and an anvil roll are made to face each other, an ultra-fine urethane nonwoven fabric is passed between both rolls, and a pressure treatment is applied under heating. It is preferable to do.
- the embossing conditions for the ultra-fine urethane nonwoven fabric are preferably an embossing roller temperature of 80 to 150 ° C., a pressure (linear pressure) of 20 to 200 N / mm, and a processing speed of 5 to 20 m / min.
- the embossed pattern (embossed pattern) applied to the ultra-fine urethane nonwoven fabric is not particularly limited as long as it has a shape in which a large number of fine irregularities are formed on at least one surface of the ultra-fine urethane nonwoven fabric.
- a lattice pattern and a large number of short lines are staggered. Patterns arranged in a shape, a pattern in which a number of short lines are combined vertically and horizontally, a pattern in which a number of small circles are arranged, and the like.
- a lattice pattern having a large number of recesses defined by intersecting ridge lines (projections) is preferable.
- the line width of the ridge lines is preferably 50 to 600 ⁇ m, the distance between the ridge lines (width of the recesses) is preferably 0.5 to 1.5 mm, and the depth of the recesses is preferably 50 to 600 ⁇ m.
- the total area of the protrusions (ridges and the like) raised on the back surface of the ultrafine urethane nonwoven fabric that is the support is usually 50% or less, preferably 40% or less, more preferably 30% or less, and even more preferably the total area of the ultrafine urethane nonwoven fabric. Is 20% or less, particularly preferably 10% or less.
- the total area of the recesses is preferably 5% or more, more preferably 10% or more, and still more preferably about 20% or more.
- the ultrafine urethane nonwoven fabric usually has a basis weight of 40 to 120 g / m 2 , preferably 50 to 100 g / m 2 , and more preferably in the range of 60 to 100 g / m 2 . Further, the thickness of the ultrafine urethane nonwoven fabric is usually about 100 to 500 ⁇ m. Furthermore, the ultrafine urethane nonwoven fabric has a water retention ratio per weight of 0.8 or less, and preferably 0.75 or less.
- the water retention ratio per weight is that the ultra-fine urethane non-woven fabric cut to a certain size is immersed in water for 30 minutes, then picked up with tweezers, and shaken a few times to drain the water (the state in which no water drops are dripping) And).
- the water retention ratio per weight is obtained from the following formula. (Weight after draining-Weight before water immersion) / Weight before water immersion
- the lower limit is not particularly limited, and when the water retention amount is small, the drying property is good and more preferable.
- the ventilation resistance value of the said support body is 1.6 kPa * s / m or less, and is 1.3 kPa * s / m or less.
- the basis weight is 40 to 120 g / m 2 , 0.1 to 1.6 kPa ⁇ s / m, when the basis weight is 50 to 100 g / m 2 , 0.25 to 1.3 kPa ⁇ s / m, and the basis weight is 60 to 100 g / m 2.
- m 2 it is preferably in the range of 0.4 to 1.3 kPa ⁇ s / m.
- the value obtained by dividing the ventilation resistance value by the basis weight is 40 g / m 2 or more and less than 60 g / m 2 per unit area, it is within the range of 0.0040 to 0.0160, and the basis weight is 60 g / m 2. In the case of m 2 or more and 100 g / m 2 or less, it is preferably in the range of 0.0075 to 0.0170. If the airflow resistance value of the support is below the above range, the interlayer strength of the support becomes insufficient, and delamination tends to occur. On the other hand, when it exceeds the above range, when it is used as a bandage, it tends to cause stuffiness when applied to human skin.
- the support in the present invention has an orientation in the width direction (CD) at the time of forming an ultrafine urethane nonwoven fabric, whereby the ratio of 30% MD load (X) to 30% tensile load (Y) of CD.
- (Y / X) is 0.5 to 3.0, preferably 1.0 to 2.0.
- X is 1.0 to 5.0 N / 24 mm, preferably 2.5 to 4.0 N / 24 mm, and Y is 1.0 to 5.0 N / 24 mm. It is preferably in the range of ⁇ 4.5 N / 24 mm.
- pigments, dyes, antistatic agents, lubricants, and the like for coloring the ultra-fine urethane nonwoven fabric to a skin color or the like can be added to the polyurethane melt to the extent that the effects of the present invention are not impaired.
- Adhesive layer (a2) The adhesive bandage of the present invention has a structure in which an adhesive layer is laminated on the surface opposite to the embossed surface of the support layer (a1).
- an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, and the like are used, but those having less skin irritation are preferable.
- acrylic pressure-sensitive adhesive for example, a homopolymer or copolymer of a long chain (meth) acrylic acid ester monomer having about 4 to 12 carbon atoms such as butyl acrylate, 2-ethylhexyl acrylate, isononyl acrylate, or (meta ) Mainly composed of acrylic acid ester monomers, and 2 or more types of other copolymerizable monomers such as (meth) acrylic acid, vinyl acetate, styrene, vinyl pyrrolidone, acrylamide, hydroxyethyl acrylate, hydroxypropyl acrylate, etc. Examples thereof include a copolymer obtained by copolymerization within a range of 50% by weight.
- a copolymer obtained by copolymerization within a range of 50% by weight.
- the acrylic pressure-sensitive adhesive is a solvent type obtained by polymerizing the monomer in an organic solvent such as toluene, hexane, ethyl acetate, or the like, using a peroxide such as benzoyl peroxide as an initiator in a nitrogen atmosphere.
- a peroxide such as benzoyl peroxide
- it may be an emulsion type obtained by polymerizing a monomer after emulsifying and dispersing the monomer in water with an emulsifier. After polymerization, it is preferable to crosslink the polymer by adding an appropriate amount of a polyfunctional resin such as an epoxy resin before coating on a sheet or film substrate.
- the rubber-based pressure-sensitive adhesive examples include a composition in which a tackifier resin, a softening agent, and the like are blended with a rubber base such as synthetic polyisoprene rubber and styrene-isoprene-styrene block copolymer.
- the pressure-sensitive adhesive layer (a2) in the adhesive bandage of the present invention is preferably a pressure-sensitive adhesive layer (a2) having air permeability.
- the air-permeable pressure-sensitive adhesive layer (a2) is a pressure-sensitive adhesive having an air permeability of 20 seconds / 100 mL or less measured using a Gurley type densometer (Tester Sangyo Co., Ltd.) in accordance with JIS-P8117. .
- the air permeability of the pressure-sensitive adhesive layer (a2) is preferably 10 seconds / 100 mL or less, more preferably 5 seconds / 100 mL or less, still more preferably 1 second / 100 mL or less.
- the air permeability of the pressure-sensitive adhesive layer (a2) itself cannot be measured, the value measured in a state of being laminated with a material having air permeability higher than that of the pressure-sensitive adhesive layer (a2) such as a nonwoven fabric or a woven fabric is used. And the air permeability of the pressure-sensitive adhesive layer (a2).
- the measurement of the air permeability of the pressure-sensitive adhesive layer (a2) is specifically as follows. That is, the adhesive bandage (A) [support layer (a1) and pressure-sensitive adhesive layer (a2) cut to a size of 50 mm ⁇ 50 mm. ] Is affixed to the fastening plate (base). The area that penetrates the clamping plate is 645.16 mm 2 .
- the air permeability of the adhesive bandage (a) obtained by gently lowering the inner cylinder and measuring the number of seconds through which 100 mL of air passes is defined as the air permeability (second / 100 mL) of the adhesive layer (a2). Therefore, the air permeability of the bandage (A) is particularly preferably 0.2 to 10.0 seconds / 100 mL.
- the air-permeable pressure-sensitive adhesive layer (a2) as the pressure-sensitive adhesive layer in the adhesive bandage of the present invention, the air permeability and cushioning properties of the pressure-sensitive adhesive layer and the adhesive bandage are improved, and the followability to the skin is improved. And good adhesion to the skin.
- the expansion ratio of the air-permeable pressure-sensitive adhesive layer (a2) is usually 1.1 to 10 times, preferably 1.2 to 8 times, more preferably 1.5 to 6 times, and further preferably 2 to 5 times. It is a range.
- the density of the air-permeable pressure-sensitive adhesive layer (a2) is usually 0.1 to 0.9 g / cm 3 , preferably 0.12 to 0.8 g / cm 3 , more preferably 0.15 to 0.00.
- the range is 6 g / cm 3 , more preferably 0.2 to 0.5 g / cm 3 .
- the air-permeable pressure-sensitive adhesive layer (a2) is usually provided on the entire surface of one side of the support layer (a1). However, if desired, the pressure-sensitive adhesive layer (a2) is not provided on the entire surface of the support layer (a1). It can also be provided in a part within a range not given.
- the thickness of the air-permeable pressure-sensitive adhesive layer (a2) is not particularly limited, but is usually in the range of 10 to 200 ⁇ m, preferably 15 to 150 ⁇ m, more preferably 20 to 100 ⁇ m.
- the adhesive strength of the air-permeable pressure-sensitive adhesive layer (a2) is preferably 1.0 to 10 N / 24 mm, more preferably 5.0 to 8.0 N / 24 mm in terms of adhesive strength (peeling force) to the bakelite plate. Adjust so that
- the air-permeable pressure-sensitive adhesive layer (a2) in the present invention can be obtained by a usual method. Specifically, the adhesive is mixed with a physical foaming agent such as air, nitrogen gas or carbon dioxide, a decomposable chemical foaming agent, an aqueous solution or an organic solvent, and then applied to the release paper or adhered. Apply the agent to release paper that has been coated or sprayed with an aqueous solution or organic solvent in advance, and then apply heat to the surface of the undried adhesive after coating, in addition to a foaming method that uses foaming or vaporization.
- a physical foaming agent such as air, nitrogen gas or carbon dioxide, a decomposable chemical foaming agent, an aqueous solution or an organic solvent
- Examples include a method of forming fine holes by applying mist-like moisture, a method of discharging an adhesive on a release paper in the form of threads and fibers, etc., and by these methods, an adhesive having a large number of fine holes A layer is formed.
- the method by foaming is preferable from the viewpoint of forming fine and uniform holes.
- Pad layer (b) The adhesive bandage of the present invention may include a pad layer (b).
- a pad layer (b) is a layer provided in order to have functions, such as a hemostasis and protection of an affected part, when a bandage is stuck on an affected part.
- gauze, non-woven fabric, woven fabric, knitted fabric, compressed fiber, hydrocolloid and other materials having absorbency may be used.
- thin film processing with polyethylene or other plastics may be performed on the upper surface of the above material to affect the affected area. In some cases, it is possible to prevent the body fluid from coming out from adhering to the affected area.
- the pad layer (b) can hold a disinfectant, a therapeutic agent and other agents as necessary.
- the size of the pad layer (b) is usually in the range of 5% to 70%, preferably 10% to 50%, preferably 15% to 40%, assuming that the total area of the adhesive bandage is 100%. More preferably.
- the adhesive bandage of the present invention usually further comprises a release sheet (c).
- the release sheet (c) is laminated on the surface of the pressure-sensitive adhesive layer (a2) opposite to the support layer (a1) containing the ultrafine urethane nonwoven fabric.
- the release sheet (c) those conventionally used in the field of adhesive bandages can be used.
- a paper substrate such as high-quality paper or glassine paper which has been subjected to a release treatment by applying a release agent, a polyester film, or the like is used.
- the release sheet (c) may be of a size and shape that covers the entire bandage with one sheet, or may be larger than the area of the bandage.
- the release sheet (c) may be divided into two or more sheets, and at least one of the two or more divided release sheets (c) may be provided with a folded portion. Further, one release sheet (c) covering a part or more of the pad layer (b), and two or more release sheets (on the adhesive layer (a2) having air permeability and adhesive bandage around the pad layer ( c) may be arranged to provide a release sheet (c) divided into a total of 3 or more.
- the adhesive bandage according to the present invention is a pressure-sensitive adhesive having air permeability on the surface opposite to the embossed surface on the support layer (a1) made of an ultrafine urethane nonwoven fabric with one surface embossed. It includes an elongated laminate having the layer (a2) laminated.
- the ratio (y / x) to the 30% tensile load (y) is in the range of 0.5 to 3.0, and preferably in the range of 0.8 to 2.0.
- x is 1.0 to 5.0 N / 24 mm, and preferably 2.0 to 4.0 N / 24 mm.
- y is 1.0 to 5.0 N / 24 mm, preferably 2.0 to 4.5 N / 24 mm.
- the adhesive strength of the adhesive bandage (A) to the bakelite plate is 5.0 to 8.0 N / 24 mm, and preferably 6.5 to 8.0 N / 24 mm.
- the adhesive force (self-back surface adhesive force) with respect to the support body embossing surface of the said adhesive bandage (A) is 1.2 N / 24mm or more, and it is preferable that it is 1.3 N / 24mm or more.
- the adhesive strength of the adhesive bandage to the bakelite plate is measured according to JIS-Z0237.
- the adhesive strength of the adhesive bandage to the support embossed surface was obtained by bonding a bandage cut piece having a width of 24 mm and a length of 100 mm to a bakelite plate, and a cut piece having a width of 24 mm and a length of 240 mm on the back side.
- Adhesive surfaces are bonded together with both ends aligned, and after pressing once with a load of 50 g, the peeling force from the back of the cut piece in the direction of 180 degrees with a tensile tester is the tensile speed. Measure at 300 mm / min.
- the adhesive strength of the adhesive bandage (A) is less than 5.0, the adhesive strength to the skin will be weakened, and if it peels off due to rubbing with clothes or is applied to a bent or extended part such as a joint, it is being applied. May cause the skin to float.
- the self-back surface adhesive strength is less than 1.2, when it is applied around a finger or the like and one end is attached to the own back surface, it tends to rub against clothes during the application. is there.
- the upper limit is not particularly limited, but 2.0 N / 24 mm is preferable. If it exceeds 2.0, it tends to be difficult to peel off after use, or the nonwoven fabric surface layer may be peeled off.
- the adhesive bandage (A) preferably has an air permeability of 10.0 seconds / 100 mL or less. If the air permeability exceeds 10.0 seconds / 100 mL, it tends to be stuffy at the time of application in summer.
- the adhesive bandage (A) according to the present invention satisfying all the above numerical ranges for each characteristic mainly includes the type, size, shape, etc. of the embossed pattern (embossed pattern) of the support layer (a1), It can be obtained by controlling the pressure-bonding force (pressure) or the like and further controlling the pressure-sensitive adhesive force of the pressure-sensitive adhesive layer (a2).
- the adhesive bandage (A) of the present invention that satisfies all the above numerical ranges for each characteristic has the following characteristics in addition to being excellent in flexibility and stretchability derived from the ultrafine urethane nonwoven fabric in the support layer (a1). . 1. Even when it is wrapped around a finger or the like and pasted with one end adhered to the back surface of the finger and hand-operated, the end does not easily peel off. Further, the interlaminar strength of the support is strong, and the delamination of the support occurs when the edge is peeled off from the back surface, so that the problem that the pressure-sensitive adhesive layer remains on the skin hardly occurs. 2.
- the embossing tends to reduce the breathability of the support, but when it is used as a bandage, it can be put into a practically no problem range, and the properties of the bandage are well balanced. .
- the manufacturing method of the adhesive bandage (A) of the present invention is not particularly limited.
- the foamed pressure-sensitive adhesive layer (a2) may be formed by directly applying an organic solvent solution or emulsion of the pressure-sensitive adhesive component on the surface opposite to the embossed surface and foaming the pressure-sensitive adhesive.
- the pressure-sensitive adhesive is foamed.
- a method of laminating with a support layer (a1) made of a nonwoven fabric formed from urethane fiber can also be employed.
- the application of the synthetic resin solution or emulsion to be the pressure-sensitive adhesive may be performed according to other patterns such as dots, stripes, etc. Just do it.
- a laminate in which a support layer (a1), an adhesive layer (a2), and a release sheet (c) are laminated in this order has a constant width in the width direction at the time of coating. It is cut into pieces (optionally in a range of about 5 mm to 100 mm) and wound into an appropriate length or cut into an appropriate length (optional in a range of several cm to 1 m).
- the pad layer (b) is cut into an appropriate size, and the bandage (A) can be arbitrarily selected within a range of several centimeters to 10 cm. Place in the middle of the adhesive section in the length section, and usually place the release paper (c) further to the shape of the emergency bandage (usually a rectangle with four corners in the circumference) Cut the direction according to the width direction at the time of coating to obtain a bandage.
- a first-aid adhesive bandage is encapsulated in a wrapping paper made of paper, plastic film, or a composite material thereof to obtain a product.
- This invention also includes the polyurethane nonwoven fabric used suitably for a support body layer in the above-mentioned adhesive bandage of this invention.
- the polyurethane nonwoven fabric for adhesive bandages of the present invention is described as “ultrafine urethane nonwoven fabric” in the section of adhesive bandages, and the description of “ultrafine urethane nonwoven fabric” in the section of adhesive bandages can be applied to the detailed contents.
- a preferred form of the polyurethane non-woven fabric for adhesive bandage of the present invention is embossed on at least one of the surfaces, the water retention ratio per weight is 0.8 or less, and the ventilation resistance value is 1.6 kPa ⁇ s / m or less.
- X is preferably 2.5 to 4.0 N / 24 mm, and Y is preferably 2.5 to 4.5 N / 24 mm.
- the basis weight is preferably 50 to 100 g / m 2 .
- the adhesive bandage When such a polyurethane nonwoven fabric (extra-fine urethane nonwoven fabric) is used for the backing layer of the adhesive bandage, the adhesive bandage has excellent strength, stretchability, appearance, little uncomfortable feeling when applied, and highly satisfies other required qualities such as breathability. Can be obtained.
- the average fiber diameter of the polyurethane fiber forming this melt blown nonwoven fabric was 10.6 ⁇ m.
- the obtained ultra-fine urethane fiber nonwoven fabric was subjected to heat embossing by a point thermocompression bonding method to obtain a support layer (a1) of adhesive bandage.
- the embossing condition is that the embossed pattern (embossing pattern) is a diagonal lattice pattern having a large number of recesses defined by intersecting ridge lines (projections), the ridge line width is 70 ⁇ m, and the ridge line spacing (recesses) The width) is 0.99 mm, and the depth of the recess is 470 ⁇ m.
- the total area of the protrusions (ridges and the like) that are raised on the back surface of the nonwoven fabric serving as the support is 7% of the total area of the nonwoven fabric, and the total area of the recesses is 25%.
- the thermocompression bonding spots were set to a pitch of 1.98 mm in both MD (machine direction) and CD (width direction).
- both the raw fabrics 1 and 2 are set at a constant pressure of 45 kN (linear pressure 30 N / mm), and the temperature is varied in four stages. 2, 1-3, 1-4 (the original fabric 1), 2-1, 2-2, 2-3, 2-4 (the original fabric 2).
- the processing temperature and the embossing depth correlated, and the embossing depth became deeper as the processing temperature was higher.
- the depth of embossing was judged to be good when the ventilation resistance value was 0.5 to 1.1, and in the case of the raw fabric 2, 0.75 to 1.3.
- acrylic adhesive solution [2-ethylhexyl acrylate / vinyl acetate / acrylic acid (87/10/3) 100 parts by mass, epoxy cross-linking agent (Tetrad X; manufactured by Mitsubishi Gas Chemical Co., Ltd.) 0.03 mass Is applied to the silicone-treated process paper so that the thickness after drying is 40 ⁇ m, and as an air-permeable treatment, distilled water is sprayed onto the undried coated surface, and then heated at 130 ° C. Thus, a fine hole was formed, and an adhesive layer (a2) made of an acrylic resin having air permeability was formed. Then, it bonded together to the said ultra-fine urethane fiber nonwoven fabric, and manufactured the adhesive plaster (A).
- epoxy cross-linking agent Tetrad X; manufactured by Mitsubishi Gas Chemical Co., Ltd.
- the pad layer (b) made of gauze is cut in advance to a width of 13 mm and a length of 22 mm, and is opposed to the air-permeable acrylic pressure-sensitive adhesive layer (a2) which is exposed by peeling the process paper from the adhesive bandage (A).
- the sheet was placed on the pressure-sensitive adhesive layer (a2) on the original fabric surface with an interval of 12 mm for MD and 50 mm for CD.
- the adhesive paper (A) and the pad layer (b) are covered with a release paper (c) made of glassine paper that has been subjected to a release treatment with a silicone resin, and the width of the long side direction is adjusted to the width direction of the original fabric.
- An emergency bandage (B) was obtained by punching out into a substantially rectangular shape having an R of 72 mm and with the pad layer (b) positioned substantially in the center.
- the ratio of the area of the pad layer (b) to the area of the adhesive bandage (A) was about 16%.
- Table 1 and FIGS. 1 to 4 show the results of measuring various characteristics of this emergency bandage and the results of practical evaluation.
- the adhesive bandage tends to be slightly higher in MD and the nonwoven fabric in CD. This is a result of a change in the orientation of the ultra-fine urethane filaments due to tension applied to the MD during the adhesive processing.
- Test atmosphere Measurement was performed at a temperature of 23 ⁇ 2 ° C. and a relative humidity of 50 ⁇ 5%. The sample was previously conditioned in the same atmosphere for 24 hours, and the test piece was subjected to the test 30 minutes after being bonded to the adherend.
- the MD or CD is the long side, the width is 24mm, the length is 150mm.
- the film was pulled at a speed of 300 mm / min, and the stress when it was pulled 30 mm was read.
- Thickness of bandage The sample was measured at five points with a dial gauge (1/100, probe diameter: 5 mm ⁇ ), and the average value was obtained.
- Basis weight of adhesive bandage A sample cut into a square of 100 mm in length and width was weighed to determine the basis weight.
- Adhesive strength against bakelite plate The adhesive strength of the adhesive bandage was obtained by using the adhesive bandage (A) cut into a width of 24 mm and a length of 250 mm as a test piece. After pressing the adhesive surface of the test piece against a test panel made of Bakelite whose surface was previously cleaned, the test piece was attached with a 2 kg roller with a press speed of 300 mm / min and a press cycle of 1 round trip. Was prepared. After 20 minutes had passed from the sticking, the adhesive strength to the bakelite plate was measured under the conditions of a peeling angle of 180 ° and a peeling speed of 300 mm / min according to JIS-Z0237.
- Adhesive strength of adhesive to support surface embossed surface A piece of adhesive bandage with a width of 24 mm (raw fabric MD) and a length of 100 mm (raw fabric CD) is bonded to the bakelite plate, and the adhesive surfaces of the cut pieces with a width of 24 mm and a length of 240 mm are aligned on both sides. After laminating together and pressing once with a load of 50 g, the peeling force from the back of the cut piece in the 180 degree direction was measured at a tensile speed of 300 mm / min with a tensile tester.
- Air permeability of adhesive bandage was measured using a Gurley type densometer (Tester Sangyo Co., Ltd.) in accordance with JIS-P8117. Specifically, the adhesive bandage (A) cut to a size of 50 mm ⁇ 50 mm was peeled off when there was a release sheet, and attached to a clamping plate (base). The area permeating through the clamping plate was 645.16 mm 2 .
- Comparative Examples 1 to 4 using the original fabric 1-1, 1-4, 2-1, and 2-4 as the support were all uncomfortable immediately after application, uncomfortable feeling during application, itching during application, immediately before peeling.
- Comparative examples 1 and 3 have a degree of embossing (depth), although the adhesion to the skin of the skin, the peeled state of the overlapping portion of the adhesive bandage when peeled, and the softness of the skin immediately after peeling are within the range of no problem. Although it was relatively shallow and the adhesion of the adhesive bandage just before peeling was excellent, the ease of drying of the bandage after bathing was slightly inferior.
- the tight tightening is loosened.
- the amount of water (dryness), air permeability, interlayer strength and the like are within practically suitable ranges.
Abstract
Description
[2]前記絆創膏の通気度が、10.0sec/100mL以下であることを特徴とする、[1]に記載の絆創膏。
[3]前記絆創膏の前記短辺方向の30%引張荷重(x)が2.0~4.0N/24mm、前記長辺方向の30%引張荷重(y)が2.0~4.5N/24mmであることを特徴とする、[1]又は[2]に記載の絆創膏。
[4]ポリウレタン不織布において、表面の少なくとも一方にエンボス加工が施されており、重量当りの保水比率が0.8以下であり、通気抵抗値が1.6kPa・s/m以下であり、機械方向(MD)の30%引張荷重(X)と幅方向(CD)の30%引張荷重(Y)との比(Y/X)が1.0~2.0である、絆創膏用ポリウレタン不織布。
[5]上記Xは2.5~4.0N/24mmであり、上記Yは2.5~4.5N/24mmである、[4]に記載の絆創膏用ポリウレタン不織布。
[6]目付が50~100g/m2である、[4]又は[5]に記載の絆創膏用ポリウレタン不織布。
1.指等に巻き付けて一方の端部が自背面上に接着する状態で貼付して、手作業等を行った場合でも、容易に端部が剥れたりすることがない。また、支持体の層間強度が強く、自背面から端部を剥離する際に支持体の層間剥離が生じ、結果粘着剤層が皮膚に残るという問題が生じ難い。
2.水仕事をしたり入浴したりした場合でも、その後すぐの水切り性(ドライ感)が良く貼付部皮膚が強くふやけることがない。
3.一方、エンボス加工により、支持体の通気性は低下する傾向があるが、絆創膏とした場合、実用上特に問題の無い範囲に収めることができ、絆創膏としての諸特性のバランスが高度に取れている。
本発明の絆創膏の一実施形態は、片面にエンボス加工を施した、極細ウレタンフィラメントから形成された不織布を含む支持体層(a1)と、エンボス加工面とは逆の表面に積層された通気性を有する粘着剤層(a2)とを有する細長い形状の絆創膏(粘着テープ)である。また、別の一実施形態は、前記絆創膏の一定の長さ切片において粘着剤層略中央に、更にパッド層(b)を備える所謂、救急絆創膏である。この救急絆創膏は、さらに剥離シート(c)を備えていてもよい。以下に、本発明の絆創膏を構成する支持体層(a1)、粘着剤層(a2)、パッド層(b)、剥離シート(c)について詳細に説明する。
支持体層は、極細ウレタンフィラメントを特定の条件で製膜した不織布に、特定条件の下でエンボス加工を施したものを含む。本明細書において、「極細ウレタンフィラメントを特定の条件で製膜した不織布」、「極細ウレタンフィラメントから形成された不織布」を単に「極細ウレタン不織布」ともいう。本発明における極細ウレタン不織布の製膜に用いられる極細ウレタンフィラメントの繊維径は、好ましくは7~25μm、より好ましくは10~18μmの範囲内にある。このような極細ウレタン不織布を支持体層として用いると、強度、伸縮性、外観が良好で、貼付時に違和感が少なく、通気性等のその他の要求品質を高度に満足する絆創膏を得ることができる。
(水切り後の重量―水浸漬前の重量)/水浸漬前の重量
本発明の絆創膏は、前記支持体層(a1)のエンボス加工面とは逆の表面に粘着剤層を積層した構造をしている。この粘着剤層(a2)における粘着剤としては、アクリル系粘着剤、ゴム系粘着剤、シリコーン系粘着剤等が用いられるが、皮膚刺激性の少ないものが好ましい。
本発明の絆創膏は、パッド層(b)を備えていてもよい。本発明においてパッド層(b)とは、絆創膏を患部に貼付した際に、患部の止血・保護等の機能を有するために設けられる層である。通常、ガーゼ、不織布、織布、編布、圧縮繊維、ハイドロコロイドその他の吸収性を有する材料を使用するとよいが、使用部位によっては上記材料の上面にポリエチレンその他のプラスチックによる薄膜加工を行って、患部から出る体液等により患部に付着するのを防止するようにすることもある。また、パッド層(b)には、必要により、消毒薬、治療薬その他の薬剤を保持させることができる。パッド層(b)のサイズとしては、絆創膏全体の面積を100%とした場合に、通常5%~70%の範囲であり、10%~50%であることが好ましく、15%~40%であることがより好ましい。
本発明の絆創膏は、通常さらに、剥離シート(c)を備える。剥離シート(c)は、通気性を有する粘着剤層(a2)の前記極細ウレタン不織布を含む支持体層(a1)とは反対側の面に積層される。剥離シート(c)は、絆創膏の分野で慣用されているものを用いることができ、例えば、剥離剤を塗布して剥離処理した上質紙、グラシン紙等の紙基材やポリエステルフィルム等を用いることができる。剥離シート(c)は、絆創膏の全体を1枚で覆う寸法及び形状のものでもよく、絆創膏の面積より大きいものでもよい。また、剥離シート(c)は、2枚以上に区分されたものでもよく、該2枚以上の区分された剥離シート(c)の少なくとも1つに折り返し部を設けてもよい。さらに、前記パッド層(b)の一部以上を覆う1枚の剥離シート(c)、及び該パッド層周辺の絆創膏及び通気性を有する粘着剤層(a2)上に2枚以上の剥離シート(c)を配置して、合計3枚以上に区分された剥離シート(c)とすることもできる。
本発明に係る絆創膏は、片面にエンボス加工が施されている極細ウレタン不織布からなる支持体層(a1)に、エンボス加工面とは逆の面に通気性を有する粘着剤層(a2)を積層した細長い形状の積層体を含む。
2.水仕事をしたり入浴したりした場合にでも、その後すぐに水切り性(ドライ感)が良く貼付部が強くふやけることがない。
3.一方、エンボス加工により、支持体の通気性は低下する傾向があるが、絆創膏とした場合、実用上特に問題の無い範囲に収めることができ、絆創膏としての諸特性のバランスが高度に取れている。
本発明の絆創膏(A)の製造方法は、特に限定されないが、極細ウレタンファイバーから形成した不織布からなる支持体層(a1)の上に、片面にエンボス加工を施し、次にエンボス加工面とは逆の面に粘着剤成分の有機溶剤溶液またはエマルションを直接塗工し、該粘着剤を発泡させることによって、発泡した粘着剤層(a2)を形成してもよい。また、シリコーン系剥離剤等を塗布した工程紙上に、粘着剤の有機溶剤溶液またはエマルションを塗工し、該粘着剤を発泡させることによって、発泡した粘着剤層(a2)を形成した後に、極細ウレタンファイバーから形成した不織布からなる支持体層(a1)と積層する方法を採用することもできる。粘着剤層(a2)が、支持体層(a1)の全面に設けられない場合、その他所望により、粘着剤となる合成樹脂の溶液またはエマルションの塗工を、点状、縞状その他のパターンによって行えばよい。絆創膏(A)の最終の製品形態としては、支持体層(a1)、粘着剤層(a2)、剥離シート(c)をこの順に積層した積層体を、塗工時の幅方向に一定の幅(5mm~100mm程度の範囲で任意)で裁断し、適当な長さに巻き取ったロール状か、適当な長さ(数cm~1m程度の範囲で任意)に裁断した切片となる。
本発明は、上述の本発明の絆創膏において支持体層用に好適に用いられるポリウレタン不織布も含む。なお、本発明の絆創膏用ポリウレタン不織布は、絆創膏の項において「極細ウレタン不織布」として説明しているものであり、詳細な内容については絆創膏の項の「極細ウレタン不織布」の説明を適用できる。
数平均分子量が2,000のポリヘキサメチレンジオールと4,4-ジフェニルメタンジイソシアネートと1,4-ブタンジオールとを2軸重合機で溶融重合して、ショアA硬度90のポリエーテルポリウレタン弾性体を得た。このポリウレタン弾性体を溶融ブロー紡糸し、得られた溶融繊維群をネットコンベヤ上に落として、目付65g/m2(原反1)及び90g/m2(原反2)のメルトブロー不織布(極細ウレタンファイバー不織布)を得た。このメルトブロー不織布を形成するポリウレタンファイバーの平均繊維径は、10.6μmであった。得られた極細ウレタンファイバー不織布に、ポイント加熱圧着法により加熱エンボス加工を施して、絆創膏の支持体層(a1)とした。
不織布及び絆創膏の各特性を、以下の方法により評価した。
温度23±2℃、相対湿度50±5%で測定した。試料は、予め同雰囲気中で24時間コンディショニングし、試験片は、被着体に貼り合せた30分後に試験に供した。
JIS-L1913「一般不織布試験方法」に準拠し、250mm×250mmの試験片の重量を測定して1m2あたりに換算した。
カトーテック(株)の通気性試験機(KES-F8-AP1)を使用して、試料2枚重ねで装置に固定し、排気3秒・吸気3秒の計6秒間の通気抵抗を測定した。
一定のサイズ(100mm×100mm)に裁断し重量を測定した不織布を30分間水中に漬けた後、ピンセットで掴んで取出し、2、3回振って水切りを行った(水滴が垂れていない状態とする)。その後速やかに秤量し、次の式により重量当りの保水比率を求めた。
(水切り後の重量―水浸漬前の重量)/水浸漬前の重量
JIS-K7115に準拠して、MD又はCDを長辺として幅24mm、長さ150mm不織布原反切断片の両端をまっすぐに、引張試験機にて間隔100mmでつかみ、引張速度300mm/分で引っ張り、30mm引っ張ったときの応力を読み取った。
試料をダイヤルゲージ(1/100、プローブ径:5mmφ)にて5点測定し、その平均値を求めた。
縦横各100mmの正方形に裁断した試料を秤量して坪量を求めた。
絆創膏の粘着力は、幅24mm×長さ250mmに裁断した絆創膏(A)を試験片とした。予め表面を清浄に処理したベークライト製の試験パネルに試験片の粘着剤面を押しつけて貼着させた後、2kgのローラーで圧着速さ300mm/分、圧着回数1往復で貼着させて試験片を調製した。貼着してから20分間経過した後、JIS-Z0237に準拠し、剥離角度180°、剥離速度300mm/分の条件で、対ベークライト板粘着力を測定した。
幅24mm(原反MD)、長さ100mm(原反CD)の絆創膏切断片をベークライト板に貼り合わせ、その背面に幅24mm、長さ240mmの切断片の粘着剤面をそれぞれの両端をそろえて重なるようにして貼り合わせ、50gの荷重で一回の加圧をした後、引張試験機にて180度方向への切断片背面からの剥離力を引張速度300mm/分で測定した。
絆創膏(A)の通気度は、JIS-P8117に準拠して、ガーレー式デンソメーター(テスター産業株式会社)を使用して測定した。具体的には、50mm×50mmの大きさに裁断した絆創膏(A)を、剥離シートがある場合は該剥離シートを剥がして、締付板(土台)に貼付した。締付板を透過する面積は645.16mm2とした。ガーレー式デンソメーターの内側シリンダーを引き出し、ストッパーにセットした後、締付板の間に試験片を締め付け、内側シリンダーを静かに下降させ、100mLの空気量が通過する秒数を測定して、通気度(秒/100mL)とした。
健常な男女各5名ずつ計10名のボランティアが、救急絆創膏試料(B)を人差し指第1関節部にパッド層が手の甲側として巻き付けて一方の端部粘着剤面が救急絆創膏の表面上に重なるように貼付し、貼付日夜間の入浴を含めて24時間が過ぎた後、剥離し、その間に以下の各種状態について4乃至6段階の自己評価を行って、その平均値を求めた。
5:違和感がない
4:多少違和感がある
3:多少違和感があるが問題なし
2:違和感があり問題あり
1:違和感が大いにある
0:過度の違和感で剥した
5:かゆみ無し
4:多少かゆい程度
3:かゆいが問題なし
2:かゆくて問題あり
1:かゆくて大いに問題あり
0:過度のかゆみで剥した
5:気にならない
4:やや遅いが、気にならない
3:どちらとも言えない
2:やや遅くて、気になる
1:遅くて気になる
5:全面よく付いている
4:エッジ部がわずかに剥れた
3:1/3程度剥れた
2:半分程度剥れた
1:パッドがめくれるほど剥れた
0:剥れて脱落していた
5:層間剥離無く、きれいに絆創膏表面で剥れた
4:一部絆創膏表面層の層間剥離が生じた
3:半分以上の面積で絆創膏表面層の層間剥離が生じた
2:全面で絆創膏表面層の層間剥離が生じた
5:ふやけ無し
4:多少ふやけた
3:ふやけたが問題なし
2:ふやけてひりひり痛む
1:過度のふやけで皮膚が剥れた
Claims (6)
- 片側表面にエンボス加工が施されている極細ウレタン不織布に、エンボス加工面とは逆の表面に粘着剤層を積層した細長い形状の絆創膏において、
前記絆創膏の短辺方向の30%引張荷重(x)と長辺方向の30%引張荷重(y)との比(y/x)が0.8~2.0であり、
前記極細ウレタン不織布の重量当りの保水比率が0.8以下であり、
前記絆創膏の対ベークライト板粘着力が5.0~8.0N/24mmであり、
前記絆創膏のエンボス加工面に対する粘着力(自背面接着力)が1.2N/24mm以上であることを特徴とする、絆創膏。 - 前記絆創膏の通気度が、10.0sec/100mL以下であることを特徴とする、請求項1に記載の絆創膏。
- 前記絆創膏の前記短辺方向の30%引張荷重(x)が2.0~4.0N/24mm、前記長辺方向の30%引張荷重(y)が2.0~4.5N/24mmであることを特徴とする、請求項1又は2に記載の絆創膏。
- ポリウレタン不織布において、
表面の少なくとも一方にエンボス加工が施されており、
重量当りの保水比率が0.8以下であり、
通気抵抗値が1.6kPa・s/m以下であり、
機械方向(MD)の30%引張荷重(X)と幅方向(CD)の30%引張荷重(Y)との比(Y/X)が1.0~2.0である、絆創膏用ポリウレタン不織布。 - 上記Xは2.5~4.0N/24mmであり、
上記Yは2.5~4.5N/24mmである、請求項4に記載の絆創膏用ポリウレタン不織布。 - 目付が50~100g/m2である、請求項4又は5に記載の絆創膏用ポリウレタン不織布。
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