JP2005304791A - Dressing material with backing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide dressing material with backing material with which a part to be pasted is perfectly hermetically sealed without occurrence of a wrinkle or a gap even in the case of pasting the dressing material to a part which is not flat such as a bending part, a curved part, a waving part. <P>SOLUTION: The dressing material with the backing material is obtained by laminating an adhesive layer on one surface of an elastic support film and laminating the backing material on the other surface in a strippable manner. The dressing material after stripping the backing material has an elongation of 50 to 400% in at least one direction and an elongation recovery ratio of ≥80%. The 30% modulus of only the backing material is in a range of not exceeding 1.2 fold of the 30% modulus of the dressing material in the measuring direction of the elongation and the elongation recovery ratio. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dressing material with a backing material that is affixed to the skin surface and used to protect wounds and the like, and particularly when it is applied to a bent part or curved part of a skin, an uneven part, etc. The present invention relates to a dressing material with a backing material that can seal a sticking site with good operability.

  The dressing material protects the skin surface, for example, wounds such as burns, scratches, ulcers, and wounds, and surgical incisions such as catheter insertion parts, and is used for waterproofing when showering. It is a patch.

  And while protecting the site | part to protect from water etc. and keeping it in a clean state, there exists an effect which accelerates | stimulates healing by maintaining it in a moderate moist state.

  Therefore, it is necessary to prevent the entry of water and bacteria into the wound part in its use, and it is important to apply a dressing material so that wrinkles and gaps do not occur and to completely seal the area around the application site is there.

  However, in general dressing materials, a very thin and flexible film is used as a support film in order to improve the feeling of application during skin application. As a result, many dressing materials are self-supporting. The sex is very small.

  Therefore, the operability at the time of applying the dressing material is not good. For example, even if you try to apply the dressing material with both hands, the adhesive layer of the dressing material may adhere to a part other than the application part. The pressure-sensitive adhesive layers of the dressing material may stick to each other.

  In such a case, wrinkles and gaps may be generated in the dressing material, and the sealing performance of the pasted part may not be maintained.

  In order to solve this problem, a dressing material with a backing material in which a backing material made of polyethylene or polypropylene film is laminated on the back surface of the support film has been proposed. Since the provided backing material has an appropriate rigidity, the self-supporting property is improved as compared with the dressing material without the backing material. (For example, Patent Document 1)

  And with this self-supporting improvement, even when the separator covering the adhesive layer is removed, the handling of the dressing material with the backing material is relatively good, and the pasting operation compared to the conventional dressing material without the backing material Sexually improved.

  In particular, when a dressing is applied to a relatively flat part such as the abdomen or back, the effect of improving the handleability by the backing material is remarkable. Apply the dressing material without any wrinkles or gaps by simply pressing the entire dressing material with the material and bringing it into close contact with the skin surface, and then peeling off the backing material on the back of the support film. Can be sealed.

  However, when such a dressing material with a backing material is applied to a bent portion such as a knee or an elbow, a curved portion such as a shoulder, or an uneven portion such as an ankle, self-supporting by this backing material may be a problem. there were.

  Specifically, since the shape of the dressing material is constrained by the backing material, it is difficult to apply the dressing material with the backing material along the shape of the skin surface such as a bent part, a curved part, or an uneven part of the body. As a result, when a dressing material with a backing material is applied, wrinkles or gaps may be generated and the application site may not be sealed. In such a case, there is a concern about bacterial contamination from the outside.

  In addition, if these dressings with a backing material are applied with the knees or elbows bent, that is, the skin is stretched, the skin will shrink when the backing material is peeled off and the knees and elbows are extended after application. The dressing does not shrink enough and the dressing at the application site may sag and become wavy, which may cause an excessive load on the skin and there may be a gap between the dressing and the skin. As a result, the sealing performance may be lowered.

  In response to these problems, a dressing material with a backing material in which a backing material is provided not only on the entire support film of the dressing material but on the peripheral edge has been proposed as a dressing material with a backing material with improved skin followability. (For example, Patent Document 2)

  The use of such a dressing material with a backing material is somewhat improved, but it is the same as a conventional dressing material with a backing material in that the shape of the dressing material is constrained by the backing material. The reality is that it cannot be a practical solution.

JP-A-7-132139 (Claim 1) Japanese Utility Model Publication No. 7-40744 (Claim 1)

  The present invention was made to solve the above-mentioned problems in conventional dressings with a backing material, while maintaining the effect of the backing material to improve the sticking operability, bending portions, curved portions, unevenness It is an object of the present invention to provide a dressing material with a backing material that can completely seal the application site without causing wrinkles or gaps even when applied to a non-flat part such as a part.

  The present invention is a dressing material with a backing material in which a pressure-sensitive adhesive layer is laminated on one side of a stretchable support film and a backing material is laminated so as to be peelable on the other side, and the dressing material after peeling the backing material is at least It has an elongation rate of 50 to 400% in one direction and an elongation recovery rate of 80% or more, and 30% modulus of the backing material alone is 30% of the dressing material in the measurement direction of the elongation rate and elongation recovery rate. The present invention relates to a dressing material with a backing material characterized by being in a range not exceeding 1.2 times the% modulus, and the above problem can be solved by using a dressing material with a backing material having such a structure. Was found.

  The dressing material with backing material of the present invention employs a stretchable material for both the support film and the backing material of the dressing material, so the dressing material with backing material is stretched along the shape of the skin surface, and the pasting operation is performed. This makes it possible to apply without wrinkles or gaps even if the application site is a bent part, curved part, uneven part, etc., and seals the application part well regardless of the shape of the application part can do.

  Also, if the dressing material with backing material is stretched and applied to the knees and elbows, the backing material is peeled off after application, and the stretch support film has a stretch recovery ability to stretch the dressing material when the knees and elbows are stretched. Since it follows and shrinks as it is, it does not bend the skin of the application site in a wave shape as seen when applied without stretching, and it does not apply an unnecessary load on the skin.

  In addition, the dressing material after application can follow the movement of the skin due to its extensibility and stretch recovery, and since it adheres well, there is no gap between the dressing material and the skin, and it is sealed There is no decline in performance.

  The dressing material with a backing material of the present invention comprises a dressing material in which an adhesive layer is laminated on one side of a stretchable support film, and the elongation rate and elongation recovery rate are within a specific range, and the stretchable support film in the dressing material. It is made of a backing material that is peelably laminated on its surface and whose 30% modulus does not exceed 1.2 times the 30% modulus of the dressing material.

  As a stretchable support film for dressing material, use a film that stretches in at least one direction. Especially, considering the followability to the movement of the skin surface when the dressing material is applied to the skin surface, it is not limited to one direction. It is preferable to use a film that stretches in the direction.

  The stretch rate of the stretchable support film is 50% or more, preferably 100% or more. By using such a film, the dressing material is applied in a state of being appropriately stretched according to the extent of the stretched skin. Not only can this be a dressing material that can sufficiently follow the elongation of the skin when the dressing material is affixed to bent parts such as the knees and elbows.

  In addition, the elongation rate as used in the field of this invention is the value measured by the method described as "the measuring method of the elongation rate of a dressing material" in the below-mentioned Example.

  In selecting a resin constituting such a stretchable support film, the stretchability of the material itself is taken into account in addition to the characteristics as a dressing material support film, such as flexibility and moisture permeability.

  As a resin suitable as a stretchable support film excellent in these properties, urethane resins such as polyether polyurethane and polyester polyurethane, amide resins such as so-called nylon and polyether polyamide block polymer, acrylic resins such as polyacrylate, Olefin resins such as polyethylene, ethylene-vinyl acetate copolymer and modified polyolefin, and resins such as ionomer can be used, and among them, it is particularly preferable to use a urethane resin having good flexibility and moisture permeability.

  The thickness of the stretchable support film is usually in the range of 5 to 100 μm, and considering the strength as a support film of the dressing material, the handleability, the feeling of sticking, etc., the thickness is set to 20 to 70 μm, more preferably 30 to 50 μm. It is preferable.

  If the thickness of the stretchable support film is 5 μm or more, it can exhibit sufficient film strength as a support film for a dressing material, and the support film is used when peeling from the skin when applying a manufacturing process or a dressing material. Can be prevented from breaking.

  Moreover, if the thickness of the stretchable support film is 100 μm or less, the possibility of damage at the time of production or peeling can be further suppressed as compared with the case where the film having a thickness of about 5 μm is used. If it is a film of a certain thickness, even if it is used as a support film for a dressing material, a sense of incongruity such as a so-called tingling feeling does not occur, and a good sticking feeling can be maintained.

  An adhesive layer is laminated on one side of the stretchable support film to form a dressing material. Examples of the adhesive include acrylic adhesives, rubber adhesives, silicone adhesives, vinyl ether adhesives, and urethane adhesives. 1 type or 2 types or more of adhesives chosen from an agent etc. are used.

  Among these pressure-sensitive adhesives, hydrophobic pressure-sensitive adhesives are preferable in terms of excellent skin adhesion, and acrylic pressure-sensitive adhesives are considered in consideration of balance as a dressing material such as skin adhesion, low skin irritation, and moisture permeability. It is preferable to use an adhesive, a rubber-based adhesive, or a silicone-based adhesive.

  The thickness of the pressure-sensitive adhesive layer may be set as appropriate. However, if the thickness is too thin, the skin adhesive strength may be insufficient, and the dressing may be peeled off. To prevent this, the thickness may be 10 μm or more. preferable.

  On the other hand, if the pressure-sensitive adhesive layer is too thick, the entire dressing material becomes thick and the sticking feeling may be deteriorated. Therefore, the thickness is preferably 200 μm or less.

  And if the balance of skin adhesive force and a sticking feeling is considered, the thickness of 15-100 micrometers is preferable among the said range, and the thickness of 20-50 micrometers is more preferable.

  The present invention is characterized by using a dressing material having an elongation rate of 50 to 400% in at least one direction and a backing material having the elongation. Even when affixed to uneven portions such as a part or an ankle, the dressing material with the backing material can be applied in a state of being appropriately stretched according to the extent of the skin. In addition, such a dressing material can sufficiently follow the elongation of the skin even during application.

  If a dressing material with an elongation of less than 50% is used, sufficient skin followability may not be obtained if the knee or elbow, etc., to which the dressing material is affixed, may be unable to be obtained. If the skin followability is not good as described above, the whole or part of the adhesive layer may be peeled off from the skin when the skin expands and contracts. It may be that the original function of the dressing material to seal cannot be demonstrated.

  The elongation of the dressing material is 400% or less, and more preferably 350% or less. If you are only interested in the ability to follow the skin, you can use a dressing with an elongation of over 400%, but a dressing with a large elongation can be inferior in stretch recovery, When the tension is weakened or when the skin shrinks during application, the dressing material may not sufficiently contract and satisfactory skin followability may not be obtained.

  In addition, when a dressing material having such a high elongation rate is used, the dressing material is greatly stretched when the dressing material is peeled off from the skin surface, and the peeling force may not be easily transmitted to the dressing material application part. In such a case, not only is the dressing material very difficult to peel, but also the time during which the applied part is pulled at the time of peeling becomes longer, which causes unnecessary pain to the patient, which is not preferable.

  Further, the dressing material with a backing material of the present invention is characterized in that the elongation recovery rate of the dressing material is 80% or more. From the viewpoint of skin followability, it is preferable that the elongation recovery rate is as large as possible. A dressing material having an elongation recovery rate of preferably 85% or more, more preferably 90% or more is employed.

  The elongation recovery rate in the present invention is B- of 6.14 (stretchability of stretchable fabric) of JISL-1096 (general fabric test method) described as “Method for measuring elongation recovery rate of dressing material” in the examples described later. It is the value measured according to Method 1.

  When measured by this method, when the test piece after dewetting is shrunk to the length before stretching, the elongation recovery rate is 100%, and conversely, when the test piece is stretched without shrinking at all. In this case, the elongation recovery rate is 0%.

  If the dressing material elongation recovery rate is 80% or more, even if the dressing material with backing material is stretched and applied, even if the dressing material is stretched too much, the dressing material with backing material will shrink naturally by loosening the tension slightly. The tensioned state becomes the same as before, and the pasting operability is improved.

  Also, after applying such a dressing material to the knee or elbow, etc., if the knee or elbow is bent once and then stretched again, the dressing material will quickly contract in accordance with the contraction of the skin. Becomes a dressing material exhibiting excellent sticking feeling.

  On the other hand, if the elongation recovery rate of the dressing material is less than 80%, the dressing material may not be sufficiently contracted. There is a case where the operability of the application is reduced due to sagging and the dressing material after application cannot sufficiently follow the movement of the skin, resulting in an uncomfortable feeling at the application site.

  Next, the backing material will be described.

  Since the backing material of the present invention is removed and discarded after application of the dressing material, it is not necessary to have stretch recovery properties like the stretchable support film, and the stretch recovery rate is 0%, that is, the stretched state. Any material can be used, from one that does not shrink at all even when weighed to the one where it has a stretch recovery rate of 100%, that is, one that shrinks to the length before stretching by weight removal.

  However, the backing material is intended to improve the self-supporting property by improving the self-supporting property while maintaining the original stretchability of the dressing material, and to improve the sticking operability. Therefore, when stretching the dressing material, it is necessary to select a material that does not require extra tension as much as possible.

  Therefore, in the dressing material with a backing material of the present invention, the 30% modulus of the backing material does not exceed 1.2 times the 30% modulus of the dressing material in the extension direction, and more preferably exceeds 30% modulus of the dressing material. Use no backing material. By using such a backing material, it is possible to easily attach the dressing material with the backing material without being aware of the presence of the backing material.

  On the other hand, when the 30% modulus of the backing material exceeds 1.2 times the 30% modulus of the dressing material, the tension for stretching the backing material becomes dominant rather than the tension for stretching the dressing material, This is not preferable because there is a case where the operability of attaching is significantly lowered as compared with a dressing material not provided with a backing material.

  Examples of the backing material of the present invention include knitted fabrics, nonwoven fabrics, woven fabrics, and resin films.

  As the knitted fabric, non-woven fabric, and woven fabric, any of natural fibers and synthetic fibers can be used as the backing material of the present invention, but synthetic fibers can be prepared in various thicknesses, shapes, etc. There is an advantage that it is easy to obtain a material having characteristics.

  In addition, since synthetic fibers have an advantage that it is easier to stably obtain a certain quality than natural fibers, it is preferable to use a knitted fabric, a nonwoven fabric or a woven fabric made of synthetic fibers.

  Examples of these synthetic fibers include urethane resins such as polyether polyurethane and polyester polyurethane, amide resins such as so-called nylon, ester resins such as polyethylene terephthalate, olefin resins such as polyethylene and polypropylene, acrylic resins, Examples thereof include fibers made of a resin such as acetate resin and benzoate, and composite fibers obtained by mixing these fibers.

  Moreover, as fibers other than these, regenerated fibers such as rayon, polynosic, cupra, promix, polyclar, and semi-synthetic fibers can be suitably used.

  Among these, knitted fabrics, nonwoven fabrics, and woven fabrics made of amide resins and urethane resins that are excellent in flexibility and stretchability are particularly preferable. If a backing material made of such materials is used, the gaps in the knitted fabrics, nonwoven fabrics, and woven fabrics are reduced. In addition to the structural elasticity used, flexibility and elasticity as a material can also be used.

And when using a knitted fabric, a nonwoven fabric, or a woven fabric as a backing material, it is preferable that the basis weight is in the range of 10 to 100 g / m ² in order to sufficiently exhibit the self-supporting property of the dressing material with the backing material, and further expansion and contraction. Considering the balance of properties such as property and flexibility, the range of 10 to 60 g / m ² is more preferable.

When the basis weight is less than 10 g / m ^{2, the} effect of improving the self-supporting property by the backing material is small, and the operability improving effect at the time of applying the dressing material with the backing material may be poor.

On the other hand, in the case of a basis weight exceeding 100 g / m ² , the flexibility of the entire dressing material with the backing material may be impaired, and a feeling of tingling occurs when applying along a bent part such as a knee or an elbow. It may not bend freely, making it difficult to adhere to the skin, and the operability of application may be reduced.

  When using a resin film as the backing material, use a flexible and well-stretched film, for example, a film made of the same resin as exemplified above in the description of the stretchable support film, particularly as a preferred resin film In addition, it is preferable to use a resin film made of a urethane resin rich in elasticity.

  In order to use these knitted fabrics, non-woven fabrics, woven fabrics, and resin films as backing materials, the materials and production methods to be constructed are appropriately selected. By adjusting the thickness or the like, the 30% modulus is selected within a range not exceeding 1.2 times the 30% modulus of the dressing material.

  In the dressing material with a backing material of the present invention, it is preferable to use a material having a porous surface such as a knitted fabric, a nonwoven fabric or a woven fabric, rather than a material having a smooth surface such as a resin film, for the following reasons.

  In the laminated body such as the dressing material with the backing material of the present invention, the backing material and the dressing material each have an individual elongation rate and elongation recovery rate. Therefore, when such a laminated body is stretched, the backing material and the dressing material are stretched. A slight difference occurs in the elongation rate and elongation recovery rate of the material, and this difference causes a shearing force at the bonded portion at the interface between both layers.

  And when this shearing force becomes large, the adhesive part at the interface between the backing material and the dressing material is partially or totally destroyed and peeled off, which is a characteristic of the dressing material of the present invention. There may be a case where the handling improvement effect cannot be fully exhibited.

  In particular, in the present invention, since it is necessary to finally peel off the backing material, both layers are laminated with a weak adhesive force by using a pressure-sensitive adhesive or by heat fusion means, and the dressing material with the backing material is used. When examining the configuration, it is necessary to examine the configuration so that even if the dressing material with the backing material has a low adhesive strength, the two layers are less likely to be peeled off.

  When a backing material having a porous surface such as a knitted fabric, a nonwoven fabric or a woven fabric is used, the stretchable support film of the dressing material and the backing material are laminated as so-called point adhesion. And when it is stretched to apply such a dressing material with a backing material, a shearing force is generated at the interface between the two layers, but this shearing force is a structural stress relief that utilizes the voids of the knitted fabric and nonwoven fabric. It will be alleviated by sex.

  As a result, the shearing force generated at the interface between the two layers is reduced, and the slightly remaining shearing force is alleviated by the flexibility as the material of the two layers, and the two layers are very unlikely to delaminate.

  On the other hand, when a smooth material such as a resin film is used as the backing material, the backing material and the stretchable support film are laminated as so-called surface adhesion using the entire surface or a part of the surface. And in this case, it is not possible to expect a shearing force mitigating action using a void, as in the case of using a knitted fabric or a nonwoven fabric, and as a result, the shearing force remains large compared to the case of using a knitted fabric or a nonwoven fabric. In many cases, the adhesive layer is destroyed by the shearing force and the both layers are peeled off.

  Therefore, in order to avoid this, the backing material is preferably not a flat material such as a resin film but a porous material such as a knitted fabric or a nonwoven fabric.

  It is preferable to provide a separator for protecting the pressure-sensitive adhesive layer until use on the surface of the pressure-sensitive adhesive layer of the dressing with a backing material. Suitable separators include those coated with a release agent containing silicone on a separator substrate such as fine paper, glassine paper, parchment paper, and resin film, and those with resin anchor coating. It is made to contact | abut on the surface of an adhesive layer.

  The adhesive force between the separator and the pressure-sensitive adhesive layer is adjusted to be lower than the adhesive force between the backing material and the stretchable support film.

  If the adhesive force between the pressure-sensitive adhesive layer and the separator is greater than the adhesive force between the backing material and the stretchable support film, when the separator is removed from the pressure-sensitive adhesive layer surface of the dressing material, the separator The backing material may be peeled off from the back surface of the stretchable support film before peeling off, and in this case, the effect of the present invention of improving the sticking operability is impaired.

  As mentioned above, although the structure of the dressing material with a backing material of this invention was demonstrated, it can manufacture by the following methods, for example.

  As a preferable production method, the backing material is laminated in advance on one side of the stretchable support film so as to be peeled off, and a laminate of the backing material and the stretchable support film is produced.

  When laminating the backing material on the stretchable support film, pay attention to the adhesive strength of both layers, and if the adhesive strength of both layers is too weak, the backing material may be peeled off from the stretchable support film during manufacturing or pasting operation. .

  On the other hand, if the adhesive strength is too strong, when the backing material is peeled off after the dressing material with backing material is applied to the application site, the dressing material will not peel off at the interface between the backing material and the elastic support film, and the dressing material will peel off from the skin surface. May end up.

  In order to avoid such a problem, it is preferable to laminate the adhesive material between the backing material and the stretchable support film in a specific range, specifically 0.05 to 2 N / 19 mm. A method of laminating both layers using an adhesive, and when at least one of the stretchable support film and the backing material is formed of a thermoplastic resin, the backing material and the stretchable support film are laminated by thermocompression bonding. By this method, both layers can be laminated with the above adhesive strength.

  In particular, according to the latter method, it is not necessary to use a pressure-sensitive adhesive for laminating both layers, and it is possible to perform laminating by a simple operation of heating for a short time, so the productivity is very high. preferable.

  In addition, although the method of laminating the backing material and the stretchable support film in advance is shown here, an adhesive layer is first formed on one side of the stretchable support film, and then the backing material is provided on the other side of the stretchable support film. May be laminated.

  The dressing material of the present invention is produced by forming a pressure-sensitive adhesive layer having a predetermined thickness on the surface opposite to the surface on which the backing layer of the stretchable support film is provided. As means for forming this pressure-sensitive adhesive layer, the following two methods are exemplified.

  In the first method, a pressure-sensitive adhesive solution is applied to the surface on which the separator has been peeled and dried to form a pressure-sensitive adhesive layer. The pressure-sensitive adhesive layer is opposite to the surface on which the backing material for the stretchable support film is provided. It is a method of pasting to the surface.

  The second method is a method in which a pressure-sensitive adhesive layer is directly formed on the surface opposite to the surface on which the backing layer of the stretchable support film is provided. After the pressure-sensitive adhesive solution is applied onto the stretchable support film, it is dried and adhered. This is a method of forming an agent layer.

  And about the dressing material with a backing material manufactured in this way, a separator may be laminated | stacked on an adhesive layer as needed, and it should just cut and use for a desired shape.

  The dressing material with backing material of the present invention has been described above, but the present invention can be applied not only to the dressing material with backing material having the above-described configuration, but also various applications.

  For example, if a liquid-absorbing pad is provided on a part of the adhesive layer of the dressing with a backing material having the above-described configuration, liquid leakage from the applied site can be prevented even when there is a large amount of exudate from the skin. If a substance that enhances the therapeutic effect is included in advance, the therapeutic effect can be further enhanced.

  The absorbent pad used in this case is gauze, cotton cloth, non-woven fabric, absorbent cotton / non-woven fabric composite, absorbent cotton / knitted composite, etc. In order to prevent sticking, a mesh or a perforated film can be provided on the surface.

  In addition, when providing a liquid absorption pad, when the liquid absorption pad covers a small area of 1/3 or less of the area of the pressure-sensitive adhesive layer, it is not necessary to worry about the elasticity of the liquid absorption pad itself. If the absorbent pad covers a wide area of the adhesive layer, select one with characteristics that do not significantly affect the stretchability and stretch recovery of the dressing material, taking into account the stretchability of the absorbent pad. Determine the composition of the dressing with backing material.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to these Examples, A various application is possible within the range which does not deviate from the technical idea of this invention.

  The physical property values of the dressing material and the backing material were measured by the following methods, and the pasting operability, skin sealing property, and skin followability as the dressing material with the backing material were evaluated. In the following description, “parts” means parts by weight and “%” means percent by weight unless otherwise specified.

  (Measurement method of elongation rate of dressing material) Measurement was performed in accordance with method B-1 (constant load method) of Section 6.14 "Method for evaluating stretchability of stretchable fabric" in JISL-1096 (General fabric test method). .

  As the test piece 1, a dressing material cut out to 50 × 100 mm shown in FIG. 1 is used, and the tension measuring device (autograph AGIS; The measurement was carried out by setting to Shimadzu Corporation. The distance L0 between the two marks 3 and 3 'at the start of the test is 50 mm.

  The test piece 1 was stretched while maintaining a tension of 1.5 kg, and a distance between the marks 3 and 3 ′ was measured 1 minute after the start of stretching to obtain L1 (mm). These L1 and L0 were substituted into the following formula to determine the elongation.

  (Measurement method of the dressing material elongation recovery rate) After measuring the dressing material elongation rate, the weight was immediately removed, and the distance between the marks 3 and 3 '30 seconds after the weight was removed was measured by L2 (mm ). The values of L1, L2 and L0 were substituted into the following formula to determine the elongation recovery rate.

  (Measurement method of 30% modulus) Measurement was performed according to the measurement method of 30% modulus of JISZ-0237 (adhesive tape, adhesive sheet test method). As the test piece 4, a dressing material and a backing material cut into 20 × 120 mm shown in FIG. 2 are used, and 10 mm portions from both ends in the longitudinal direction of the test piece 4 are gripped as whites 5 and 5 ′, respectively. (Autograph AGIS; manufactured by Shimadzu Corporation) was used for measurement.

(Evaluation of sticking operability) A dressing material with a backing material cut to a size of 7 × 10 cm was stuck on the bent elbow, and the ease of sticking at that time was evaluated according to the following criteria. In addition, when affixing, it affixed so that wrinkles might not generate | occur | produce in dressing material as much as possible.
○: Easy to apply.
Δ: Slightly difficult to affix.
X: It was very difficult to apply.

  The wrinkle in the present invention means a state where the pressure-sensitive adhesive layer of the dressing material is not sufficiently adhered to the skin, for example, a state where the pressure-sensitive adhesive layer floats from the skin and creates a gap. This means that the pressure-sensitive adhesive layers of the dressing material stick to each other and the part is not in close contact with the skin.

  Therefore, even if the appearance appears to be wrinkled, the wrinkle is due to the shape of the skin, and if the pressure-sensitive adhesive layer is in close contact with the skin along the wrinkle, Judged that it did not occur.

(Skin sealability evaluation) The following shows whether the dressing material can completely seal the application site by peeling the backing material from the back of the stretchable support film of the dressing material with the backing material and observing the appearance of the dressing material. It was evaluated according to the criteria.
○: The entire pressure-sensitive adhesive layer of the dressing material was completely in contact with the skin, and the application site was completely sealed.
(Triangle | delta): Although wrinkles were contained in a very small part of a sticking site | part, it was thought that there was no influence on sealing performance.
X: A plurality of large wrinkles or a large number of small wrinkles occurred at the application site, and it was considered that the sealing property of the application site was affected.

(Skin followability evaluation) After evaluating the skin sealing property, the elbow was bent and stretched, and the skin followability of the dressing material was evaluated according to the following criteria.
○: The dressing material sufficiently followed the bending and stretching of the skin, and almost no sense of incongruity occurred.
Δ: Although the dressing material follows the bending and stretching of the skin, there was a sense of incongruity when bending or stretching.
X: The followability of the dressing material with respect to bending and stretching of the skin was poor, and there was a great sense of incongruity when bending or stretching.

(Example 1)
A monomer mixture consisting of 65 parts isononyl acrylate, 30 parts 2-methoxyethyl acrylate and 5 parts acrylic acid, and 0.2 part azobisisobutyronitrile as a polymerization initiator in ethyl acetate for copolymerization Next, 45 parts of caprylic acid triglyceride and 0.1 part of an isocyanate crosslinking agent were blended to prepare an ethyl acetate solution of an adhesive.

  The pressure-sensitive adhesive solution was applied to the silicone-treated surface of the separator so that the thickness of the pressure-sensitive adhesive layer after drying was 30 μm, and dried at 100 ° C. for 3 minutes to form a pressure-sensitive adhesive layer.

  The pressure-sensitive adhesive layer is bonded to one side of the polyether polyurethane film A, which is a stretchable support film, and heated at 60 ° C. for 72 hours to fully acclimate the stretchable support film and the pressure-sensitive adhesive layer. Was made.

Next, the stretchable support film of the dressing material was covered with a polyamide knitted fabric A having a basis weight of 15 g / m ² as a backing material, and subjected to a thermocompression treatment at 70 ° C. for 10 seconds with a thermocompression bonding machine, The backing material was laminated, and the dressing material with the backing material of the present invention was produced.

  Using the dressing material with the backing material thus produced, elongation rate, elongation recovery rate, 30% modulus, application operability evaluation, skin sealability evaluation, and skin followability evaluation were performed. The results are summarized in Table 1.

(Examples 2 to 6)
By the same operation as in Example 1, the test pieces of Examples 2 to 6 were prepared, the physical property values were measured, and the properties of the dressing material with the backing material were evaluated. The stretchable support film and backing material used in each example are shown in Table 1. The measurement results and evaluation results are also summarized in Table 1.

(Example 7)
A pressure-sensitive adhesive layer was formed by the same operation as in Example 1, and this pressure-sensitive adhesive layer was laminated on the stretchable support film side of the stretchable support film / lining material laminate prepared in advance, and at 60 ° C. for 72 hours. A dressing material with a backing material was produced by warming and fully blending the stretchable support film and the pressure-sensitive adhesive layer.

  The stretchable support film / lining material laminate is a laminate obtained by superimposing both layers and thermocompression bonding.

  And using the produced dressing material with a backing material, elongation rate, elongation recovery rate, 30% modulus, sticking operability evaluation, skin sealability evaluation, and skin followability evaluation were performed.

  Table 1 summarizes the measurement results of each physical property value and the characteristics evaluation results as a dressing material with a backing material, as well as the types of the stretchable support film and the backing material.

(Examples 8 to 9)
Using the stretchable support film and the backing material shown in Table 1, a dressing material with a backing material was produced by the same operation as in Example 1, and each physical property value was measured. In addition, the separator of the dressing material with the backing material is once peeled off, and a 3 × 5 cm-sized liquid-absorbing pad is placed in the center of the pressure-sensitive adhesive layer. A dressing material with a backing material having a liquid absorbing pad was prepared.

In addition, the used liquid absorption pad provided the polyethylene mesh on the surface of the nonwoven fabric of the fabric weight 120g / m < ² > which consists of a cellulose-polyester-polyolefin mixed fiber.

  Using the dressing material with the backing material having the liquid-absorbing pad, the characteristics as the dressing material with the backing material were evaluated. In addition to the types of stretchable support film and backing material used, the measurement results of each physical property value and the evaluation results of the properties are also summarized in Table 1.

(Comparative Examples 1-3)
By the same operation as in Example 1, the dressing materials with backing materials of Comparative Examples 1 to 3 were prepared, measured for physical properties, and evaluated as characteristics of the dressing materials with backing materials. In addition to the types of stretchable support films and backing materials used in each Example, the measurement results of the respective physical properties and the results of the property evaluation as a dressing material with a backing material are also summarized in Table 1.

  As a result of performing application operability evaluation, skin sealability evaluation, and skin follow-up evaluation in these examples and comparative examples, the dressing materials with backing materials of Examples 1 to 7, which are embodiments of the present invention, are applied sites. The application operability when applying the dressing material with the backing material along the shape of the elbow was very good, and it was possible to apply it along the shape of the skin without causing wrinkles or gaps.

  This is considered to be a result of the fact that the stretchable support film of the dressing material has a predetermined elongation rate, and that the elongation recovery rate is also in a predetermined range, and due to this characteristic, it is merely stretched. In addition, even if it was stretched too much, it quickly contracted by loosening the tension. Therefore, it was thought that the fact that the dressing material with the backing material could be applied without sagging during the application operation greatly contributed.

  In these examples, since the 30% modulus value of the backing material is smaller than 1.2 times the 30% modulus value of the dressing material, the tension required for stretching the dressing material with the backing material is relatively high. When it was small, and considering the effect of improving the self-supporting property by the backing material, the sticking operation was very good.

  In addition, when applying a dressing material with a backing material to a bent elbow, the dressing material after peeling the backing material is stretched when the skin of the applied part is stretched. At the same time, the dressing material can be stretched moderately, and even when the skin shrinks, the stretchable support film has a moderate stretch recovery rate, so it quickly shrinks according to the shrinkage of the skin, and the applied site is uncomfortable. Is not given.

  Example 8 and Example 9 provided with a liquid-absorbing pad on the surface of the pressure-sensitive adhesive layer also exhibited the same adhesive operability, adhesive sealing property, and skin followability as the samples of Examples 1 to 7, and a padded dressing material As a result, good characteristics were exhibited.

  On the other hand, in Comparative Examples 1 to 3 that do not satisfy the configuration of the present invention, it is not a dressing material with a backing material that has all the properties of skin followability, application operability, and skin followability in a well-balanced manner. Had a problem.

  The dressing material with the backing material of Comparative Example 1 uses a material that can be stretched not only to the stretchable support film of the dressing material but also to the backing material, and is applied while being stretched in the same manner as the dressing material with the backing material of the present invention. The operation could be performed.

  However, when the dressing material with backing material was stretched too much during the sticking operation, it became a state where it did not shrink so much even when the tension was loosened. Due to this sagging, it is necessary to finely adjust the tension when applying, so that it is difficult to perform the applying operation smoothly compared to the dressing material of the present invention.

  In addition, when the dressing material was applied and then the backing material was peeled off and the elbow was bent and stretched, the dressing material at the applied site was bent in a wavy shape when the elbow was extended, resulting in an uncomfortable feeling.

  These results are considered to be because the dressing material was not sufficiently contracted when the elbow was bent and the dressing material was sagging because the elongation recovery rate of the dressing material was relatively small.

  In contrast to the comparative example 1, in the dressing material with the backing material of the present invention, for example, the dressing material with the backing material of Example 4 using the same backing material, the dressing material with the backing material is quickly released if the tension is slightly relaxed. Shrinkage was also good, and the skin followability after application was also good, and the application operation could be performed easily.

  The dressing material with the backing material of Comparative Example 2 can hardly be stretched at the time of application, and has to be applied with a length approximately the same as the initial length of the dressing material with the backing material, and the dressing material with the backing material Because of its high rigidity, it was very difficult to apply it according to the shape of the skin surface.

  And when the backing material is peeled off from the dressing material with the backing material after pasting and the appearance of the dressing material is observed, a lot of wrinkles are generated on the back surface of the adhesive layer of the dressing material. There was a possibility that the skin surface was not sealed by the wrinkles. Such wrinkles were particularly frequent on the side surface of the elbow.

  The reason for this is considered that although the dressing material itself is excellent in stretchability and stretch recovery property, the backing material is difficult to stretch, and the 30% modulus of the backing material is large enough to be out of the scope of the present invention.

  On the other hand, in the dressing materials of Examples 1 to 7, which are embodiments of the present invention, all exhibited good application operability, and poor application operability and occurrence of wrinkles as seen in Comparative Example 2 did not occur. There wasn't.

  In Examples 1 to 7, since the dressing material having an elongation rate of 50% or more is used, the dressing material can be stretched to a degree sufficient to conform to the shape of the applied site, and the backing material is also at least 30%. As it stretched and the 30% modulus of both layers was also within the specified range, it was thought that one of the reasons was that it was easy to apply according to the elongation of the skin simply by applying a relatively small tension. .

  Further, as described above, the dressing material of Comparative Example 2 has no problem when the elbow is bent, but when the elbow is stretched, the dressing material that adheres to the skin becomes loose, and a so-called tingling sensation is produced and applied. Although the feeling was not good, such a problem did not occur in the dressing materials of Examples 1 to 7 which are embodiments of the present invention.

  Furthermore, in the dressing material of Comparative Example 2, there is also a problem when the dressing material is peeled off from the skin, and when the dressing material is turned from the edge and pulled, the stretch rate of the stretchable support film of the dressing material is very large. In addition, the time for pulling the applied site was relatively long, and the pain at the time of peeling was greater than in the examples and other comparative examples.

  The dressing material with the backing material of Comparative Example 3 could not be sufficiently stretched when applied to the elbow, and the application operability was poor even if it was applied along the shape of the elbow. While the knitted fabric that stretches well as the backing material is used, the stretch rate of the stretchable support film of the dressing material is as small as 20%. It was.

  Furthermore, since the dressing material of Comparative Example 3 has a small stretch rate of the stretchable support film and a small stretch recovery rate, it cannot follow the subtle movement of the skin surface. Just being there caused some discomfort. Also, when a dressing material is applied to a bent elbow and then the elbow is stretched, there is a sense of incongruity that the dressing material rubs over the skin surface of the elbow, and it cannot be said that the feeling of application is good. It was.

  On the other hand, in Examples 1 to 7 having the configuration of the present invention, in particular, in the dressing material with backing material of Example 1 using the same backing material as Comparative Example 3, a film having a predetermined range of elongation as a stretchable support film is used. Since it used, the problem like the comparative example 3 did not arise, and it was easy to stick according to the shape of an elbow part by sticking while extending the dressing material with a backing material.

  Moreover, the dressing material of Example 1 affixed to the elbow part has moderate stretchability and elongation recovery rate, and has a very excellent sticking feeling.

It is a top view explaining the test piece for measuring the elongation rate of a dressing material. It is a top view explaining the test piece for measuring 30% modulus. It is a top view of a dressing material with a backing material with a liquid absorption pad.

Explanation of symbols

1 Test piece 2, 2 ′ gripping white 3, 3 ′ 4 Test piece 5, 5 ′ gripping white 6 Dressing material 7 with backing material Adhesive layer 8 Liquid absorbing pad

Claims (6)

  A dressing material with a backing material in which a pressure-sensitive adhesive layer is laminated on one side of an elastic support film and a backing material is laminated on the other side so that the backing material can be peeled, and the dressing material after peeling the backing material is at least 50 in one direction. It has an elongation rate of ˜400% and an elongation recovery rate of 80% or more, and the 30% modulus of the backing material alone is one of the 30% modulus of the dressing material in the measurement direction of the elongation rate and elongation recovery rate. . Dressing material with backing, characterized in that it does not exceed 2 times.   The dressing material with a backing material according to claim 1, wherein the stretchable support film is made of a urethane resin.   The dressing material with a backing material according to claim 1, wherein the backing material comprises a knitted fabric or a nonwoven fabric.   The dressing material with a backing material according to claim 3, wherein the knitted fabric or the nonwoven fabric is made of a urethane resin and / or an amide resin. Backing with dressing material according to claim 3, wherein the basis weight of the knitted fabric or nonwoven fabric is in the range of 10 to 100 g / m ^2. The dressing material with a backing material according to claim 1, wherein a liquid absorbing pad is provided on the surface of the pressure-sensitive adhesive layer.

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