JP2007021068A - Skin-stickable adhesive tape or sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a skin-stickable adhesive tape or a sheet with such flexibility and fixedness as to follow the contraction/stretching of the skin caused by bending, etc. of a stuck region even underwater, capable of being stuck over the stuck region. <P>SOLUTION: The skin-stickable adhesive tape or the sheet is made of an elastic base material with elasticity at least either in the vertical or horizontal direction, which has an adhesive layer. The tension strength of the tape or sheet at least either in the vertical or horizontal direction is from 10 N/19 mm to 180 N/19 mm, the elongation is from 40% to 1,300%, the 50% modulus is from 1.0 N/19 mm to 15.0 N/19 mm, the stress relaxation rate is not more than 40%, and the water-resistant stretching self-back adhesion rate is at least 90%. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an adhesive tape or sheet for skin application, for example, an adhesive tape or sheet for skin application used in the medical, hygiene field, sports field, and the like.

  In the medical field, the sports field, and the like, adhesive tape for skin application is used for emergency adhesive plaster, plaster, adhesive bandage, taping tape, and the like. For example, taping tape exhibits effects such as pain reduction, injury prevention, and treatment promotion by fixing, supporting, reinforcing, and compressing joints such as joints and muscles. Taping is a relatively inexpensive and easy way to reduce pain compared to medical treatment, surgery, and other treatment methods. It also helps reduce pain during sports, prevent injuries and provide first aid. Is also an effective method.

  By the way, in recent years, lack of exercise has been pointed out because transportation has been improved and can be used conveniently. Also, with the westernization of eating habits, the shift from vegetable-based life to meat-based life has led to overnutrition and obesity has become a problem. Furthermore, with the remarkable economic growth, the working hours have become 24 hours, and the number of people who are working until midnight has increased. For this reason, restaurants, convenience stores, etc. have been operating for 24 hours, making it easier to eat and drink at night, and the cause of obesity has further increased.

  In order to eliminate such exercise deficiencies and obesity, exercises such as aerobics, exercise bikes, and strength improvement have been actively performed. These are sports that can be used easily because there are relatively few restrictions on time and place. However, since they are exercises in the air, the burden due to gravity is large, and the burden on muscles and joints is large. For this reason, attention has recently been paid to underwater exercise with a low load of gravity. For example, underwater walking and underwater aerobics in a pool have been actively performed. The movement in water has the advantage that effective movement can be efficiently performed in a short time by resistance of water as well as reduction of gravity by buoyancy. In addition, swimming is a sport that has been familiar to Japanese people since ancient times. Moreover, underwater sports such as swimming are becoming more and more popular in the future, as Japanese people are active in world competitions such as the Olympics. is expected.

  Under such circumstances, an adhesive tape for skin application that can be used in water, in particular, a taping tape that can support and fix muscles, joints, and the like has been required. Various types of adhesive tape for skin application have been known as taping tapes applicable to normal exercise, but they are insufficient for use in water. That is, the adhesive tape for skin application used in water is suitable for the characteristics of conventional taping tapes, such as the elasticity of the skin, the ability to follow the skin when the joint is bent, and the appropriate elongation. Stress-retaining (kickback property), low skin irritation that does not cause physical irritation or blurring of the skin, and is an adhesive tape for skin application that does not cause discomfort or discomfort Required. This is especially true for adhesive tape for skin application, which is often applied to areas where it is easy to feel irritation such as the arms and knees. Furthermore, there is no risk of peeling off the skin in water or peeling off the adhesive tape for skin even during intense exercise such as swimming or swimming, and in order to exert the taping effect of the adhesive tape for skin application, In this case, it is required to maintain a sufficient adhesive force. In addition, a function capable of sufficiently following the expansion and contraction of joints, muscles and the like in water, an appropriate stress retention property, and the like are required. For example, some conventional products have an adhesive tape with a water-repellent treatment on the back of the base material to prevent moisture from entering the base material. It was something that could not be done.

JP-A-8-66418 Japanese Patent Laid-Open No. 2002-35196

  The present invention has been made in view of the above circumstances, and the problem thereof is that it has flexibility and fixability that can follow the expansion and contraction of the skin due to bending of the application site even in water, and can be overlaid. The object is to provide an adhesive tape or sheet for skin application.

In order to solve the above-mentioned problems, the present inventors have intensively experimented and studied, and as a result, have completed the present invention.
That is, the adhesive tape or sheet for skin application of the present invention is an adhesive tape or sheet for skin application having an adhesive layer on an elastic base material having elasticity in at least one direction of length and width, And in at least one lateral direction, the tensile strength is 10 N / 19 mm or more and 180 N / 19 mm or less, the elongation is 40% or more and 1,300% or less, and the 50% modulus is 1.0 N / 19 mm or more, 15.0 N. / 19 mm or less, a stress relaxation rate of 40% or less, and a water-resistant expansion / contraction self-back adhesion rate of 90% or more.

  Here, the amount of water that passes through the stretchable base material per minute may be 10 g or less per circular area having a diameter of 25 mm.

  The adhesive tape or sheet for skin application may have a water-resistant adhesive strength of 1.0 N / 19 mm or more and a water-resistant self-back adhesive strength of 0.1 N / 19 mm or more.

  The stretchable substrate may have a contact angle with water of at least one surface of the stretchable substrate of 35 ° or more and 160 ° or less.

  ADVANTAGE OF THE INVENTION According to this invention, even in water, while having the softness | flexibility and fixing property which can follow the expansion-contraction of the skin by the bending | flexion of a sticking site | part, etc., it is realizable. it can.

BEST MODE FOR CARRYING OUT THE INVENTION

  The adhesive tape or sheet for skin application of the present invention has a medical adhesive layer on a base material that is stretchable in the vertical and / or horizontal direction. However, the adhesive tape or sheet for skin application has a longitudinal and / or transverse tensile strength of 10 N / 19 mm or more and 180/19 mm or less, an elongation of 40% or more and 1,300% or less, and a 50% modulus. Is 1.0 N / 19 mm or more and 15.0 N / 19 mm or less. Moreover, it is necessary that the stress relaxation rate of the adhesive tape or sheet for skin application is 40% or less, and the water-resistant stretchable back surface adhesion rate is 90% or more. In the present invention, the stress relaxation rate refers to the rate of decrease in stress after the adhesive tape or sheet for skin attachment is stretched 50% and held for 30 minutes. After the adhesive tape or sheet to be attached is placed in water for 30 minutes with the back surface adhered, the self-back surface adhesion rate of the pressure-sensitive adhesive sheet after repeating 30% stretching three times in water is 90% or more. .

  In order to provide flexibility and fixation that can follow the bending of joints and the expansion and contraction of the skin, the tensile strength in at least one direction of the adhesive tape or sheet for skin application is 10 N / 19 mm or more and 180 N / 19 mm or less. is required. If the tensile strength of the adhesive tape or sheet for skin application is less than 10 N / 19 mm, the followability at the time of stretching is good, but the followability at the time of contraction is not sufficient. On the other hand, if the tensile strength of the adhesive tape or sheet for skin application exceeds 180 N / 19 mm, the followability of the bent part and the followability accompanying the expansion and contraction of the skin, especially the follow-up at the time of extension becomes difficult, and there is a problem in flexibility. is there. Further, the repeated stretching operation increases resistance during stretching and facilitates skin irritation.

  When the elongation of the adhesive tape or sheet for skin application is less than 40%, the followability of the bent portion is insufficient, and it is particularly difficult to follow when stretched. On the other hand, if the elongation of the adhesive tape or sheet for skin application exceeds 1,300%, the followability at the time of expansion and contraction is sufficient, but the fixability becomes insufficient.

  If the stress relaxation rate of the adhesive tape or sheet attached to the skin exceeds 40%, the stress at the time of extension becomes low, making it difficult to follow the bent portion and the stretchable portion of the skin, and realizing appropriate fixing properties. become unable.

  In addition, when the 50% modulus of the adhesive tape or sheet for skin application is less than 1.0 N / 19 mm, sufficient control over the bending of the joint cannot be performed, and the taping function cannot be exhibited. On the other hand, if the 50% modulus of the adhesive tape or sheet for skin application exceeds 15.0 N / 19 mm, the joint bending can be controlled sufficiently, but the resistance increases due to repeated bending operations, and the adhesive tape or sheet peels off. If the adhesive tape or sheet does not peel off, skin irritation occurs.

  If the adhesive tape or sheet for skin adhesion is less than 90% water-resistant expansion and contraction, the adhesive tape or sheet for skin adhesion will follow the expansion and contraction at the bent part when it is used in water or in the rain with overlapping layers. It does not squeeze, peeling occurs from the terminal of the adhesive tape or sheet for skin application, and eventually the adhesive tape or sheet for skin application is peeled off.

  It is preferable that the pressure-sensitive adhesive tape or sheet for skin application of the present invention has a water-resistant adhesive strength of 1.0 N / 19 mm or more, which is an index of the adhesive strength to the skin in water. If the water-resistant adhesive strength is 1.0 N / 19 mm or more, sufficient skin adhesiveness can be exhibited even in water after skin attachment.

  The adhesive tape or sheet for skin application according to the present invention has an adhesive strength when measured in water after adhering to the back surface, that is, an adhesive strength to the substrate (water-resistant self-adhesive strength) is 0.1 N / 19 mm or more. It is preferable. If the water-resistant self-back surface adhesive strength is 0.1 N / 19 mm or more, the overlapped portion can exhibit sufficient adhesion even in water.

  The base material used for the adhesive tape or sheet for skin application of the present invention supports the adhesive layer, and is required to have an appropriate degree of elongation. When the base material has an appropriate degree of stretch, it can realize flexibility and fixation that can follow the flexion of joints and the expansion and contraction of the skin, and it can be overlaid to reduce skin irritation. Can be realized.

  The base material used for the adhesive tape or sheet for skin application of the present invention is preferably excellent in waterproofness, and as a criterion for waterproofing, it passes through a base material per circular area of 25 mm in diameter per minute. The amount of water (waterproof amount) is preferably 10 g or less. If the amount of water per predetermined area of the base material is 10 g or less, even if you exercise in water with the adhesive tape or sheet for skin attachment, or if it is raining or bathing, There is no sense of incongruity due to water entering the substrate.

  As a base material used for this invention, it is the material which has the elasticity and elasticity which have the followability and fixing property which are requested | required for the use for general medical use and a sanitary material. Any type of raw material can be used without particular limitation as long as it can exhibit the above-described properties of the present invention when formed on an adhesive tape or sheet for skin application. Resin, film made of olefin resin such as polyethylene, polypropylene, vinyl chloride resin, ethylene-vinyl acetate resin, polyester resin, nylon and the like alone or a blend of two or more kinds as a main component, Or the film etc. which consist of what added the triblock copolymer which consists of a polystyrene unit to the said material as a main component are used preferably. In the present invention, the substrate may have a single layer structure or a laminate structure of two or more layers. In the case of a laminate, the materials constituting each layer may be the same or different. Moreover, what laminated | stacked the woven fabric etc. on the said any film may be sufficient, for example, the laminated body etc. which laminated the polyurethane film and the woven fabric etc. are mentioned. In the present invention, in particular, a triblock copolymer comprising a polystyrene unit containing a polystyrene unit having a styrene content of 10% by weight to 30% by weight and a vinyl-polyisoprene unit is added to the ethylene-vinyl acetate copolymer. A film made of polyester or polyether polyurethane is preferably used.

  In the present invention, the substrate preferably has a contact angle of 35 ° or more and 160 ° or less with respect to water on at least one surface thereof. If the contact angle of at least one surface with respect to water is 35 ° or more, water can easily enter the interface between the base material and the pressure-sensitive adhesive layer on its own back surface even if it is overlaid and used in water. Absent. Moreover, if the contact angle with respect to water is 160 ° or less, the anchoring property between the base material and the pressure-sensitive adhesive layer is not deteriorated, the anchoring failure does not occur, and an adhesive residue is generated on the adherend. Absent.

  In the present invention, the contact angle is measured by slowly placing a predetermined amount of distilled water from a cylindrical tube such as a syringe by a known method so that no stress is applied to the surface of the substrate to be measured. Measure the angle with the material. In the present invention, it is preferable to use a substrate whose contact angle with water on the surface of the substrate is 35 ° or more and 160 ° or less, or whose contact angle is adjusted to 35 ° or more and 160 ° or less. . If the contact angle of the base material itself is within the above range, it can be used as it is without adjustment, but if not, the contact angle with respect to the water on the base material surface is adjusted to be within the above range. And preferably used. As a method for adjusting the contact angle, a method of blending a sizing agent or a water repellent when forming a film on the substrate, a back surface treatment agent, a sizing agent or a water repellent is applied to the substrate, or Examples thereof include a method of impregnating the base material, a method of applying a natural resin or a synthetic resin to the base material, or a method of laminating a layer made of the base material and the natural resin or the synthetic resin. As the sizing agent, a rosin-based or acrylic-based sizing agent can be used, and as the water repellent, a fluorine-based or silicone-based water repellant can be used. Examples of natural resins and synthetic resins include natural rubber, carboxy-modified polyvinyl alcohol, SBR, NBR, acrylic resin, vinyl chloride resin, vinylidene chloride resin, and vinyl chloride, ethylene, vinyl acetate, etc. Copolymers consisting of, emulsions such as polyethylene and polypropylene, and the like can be used.

  The thickness of the base material used in the present invention is preferably appropriately determined according to the site to which the adhesive tape or sheet for skin application or sheet is applied, the characteristics of the base material, etc. It is preferable that they are 0.05 mm or more and 1.0 mm or less, More preferably, they are 0.1 mm or more and 0.95 mm or less.

  The adhesive tape or sheet for skin application of the present invention has an adhesive layer such as an adhesive layer for medical application on one surface of the substrate. The pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer is a rubber-based pressure-sensitive adhesive or a synthetic rubber-based pressure-sensitive adhesive as long as it can adhere to the skin and has a water-resistant self-back surface adhesive strength of 0.1 N / 19 mm or more. Silicone-based pressure-sensitive adhesives, ester-based pressure-sensitive adhesives, acrylic adhesives, and the like can be used without particular limitation. The use of an acrylic pressure-sensitive adhesive is preferred because the design of a pressure-sensitive adhesive that simultaneously satisfies skin adhesiveness, skin hypoallergenicity, and water-resistant self-back adhesion is relatively easy when using an acrylic pressure-sensitive adhesive.

  As the acrylic polymer constituting the acrylic pressure-sensitive adhesive, an acrylate ester is preferably used. Examples of the acrylate ester include esters of acrylic acid or methacrylic acid having an aliphatic group such as a butyl group, 2-ethylhexyl group, isononyl group, isooctyl group, and the like. Moreover, in order to improve cohesion and adhesiveness, acrylic acid or an ester of methacrylic acid, or an acrylic acid ester having a methyl group may be copolymerized as a vinyl ester having a carboxyl group, if necessary. . The acrylic acid ester having a methyl group is the same as the acrylic acid ester, and generally includes a methyl group, an ethyl group, a lauryl group, a stearyl group, and the like.

  In the present invention, if necessary, a functional group that becomes a crosslinking point in the side chain, for example, a hydroxyl group, an amino group, an epoxy group or the like, and divinyl acrylate, trimethylpropanol triacrylate, dipentaerythritol hexaacrylate Polyfunctional unsaturated monomers having two or more polymerizable carbon-carbon double bonds in one molecule such as pentaerythritol triacrylate can be used in combination as a copolymerization monomer.

  The acrylic polymer used in the present invention may further contain an initiator. The initiator is not particularly limited. For example, a radical is generated by thermal decomposition of a peroxide such as hydrogen peroxide or benzoyl peroxide, or an azo compound represented by azobisisobutyronitrile (AIBN). A general initiator or the like that can generate radicals by irradiation of ultraviolet rays or the like can be used.

  The polymerization method for forming the acrylic polymer may be a solution polymerization method, an emulsion polymerization method, a suspension polymerization method, or the like, and is not particularly limited. For example, in the presence of a solvent or water, polymerization can be carried out by generating radicals using an initiator by thermal decomposition, or by generating radicals using an initiator that generates radicals by ultraviolet irradiation. Moreover, you may use a crosslinking agent instead of the polyfunctional unsaturated monomer which has a 2 or more polymerizable carbon-carbon double bond in 1 molecule as needed. Examples of the crosslinking agent used include epoxy-based, isocyanate-based, metal ion-based, amine-based, silanol-based, and peroxide-based crosslinking agents. In the present invention, the polymerization may be performed using a general method such as a chemical method using a crosslinking agent or the like, or a physical method using electron beam irradiation or the like.

  The adhesive layer preferably has a gel content of 25% or more and 80% or less. If the gel content of the adhesive layer is 25% or more, no adhesive residue is generated. Moreover, if the gel content of the adhesive layer is 80% or less, the obtained adhesive tape or sheet for skin application can have sufficient adhesion, and can sufficiently follow the expansion and contraction and bending of the skin, and Sufficient fixability can be obtained. In the present invention, “gel part” means “insoluble part”, and the insoluble part is disclosed in JP-A-2002-65841, which means that it does not dissolve in an organic solvent. Here, “insoluble matter” means that the dried sample is immersed in toluene at room temperature for 7 days and insoluble in a polytetrafluoroethylene membrane (NTF membrane manufactured by Nitto Denko Corporation) having an average pore size of 0.2 μm. It is a value calculated by separating (drying) the fraction (residue), drying, and ratio (%) to the weight of the dried sample before immersion.

  In the present invention, if necessary, the tackiness property can be adjusted by adding a tackifier, a softening agent, a liquid component or the like to the pressure-sensitive adhesive within a range that does not impair the effects of the present invention.

  In this invention, an adhesion layer is formed using the said adhesive. The pressure-sensitive adhesive layer may be provided on the entire surface of the substrate or may be provided partially. When the adhesive layer is partially provided, it can be provided in a dot shape or a stripe shape. Since skin irritation is likely to occur when the skin is steamed, it is preferable to have a space that functions as an air passage. The strip shape is not particularly limited as long as a space functioning as an air passage is secured, and examples thereof include a straight shape and a wave shape, and other shapes may be used. Generally, a wavy shape in which the cross-sectional area of the interstitial space has little change with time is preferable. In the present invention, the shape of the pressure-sensitive adhesive layer is preferably determined as appropriate depending on the properties of the pressure-sensitive adhesive layer and the use site of the formed pressure-sensitive adhesive tape or sheet.

  The thickness of the pressure-sensitive adhesive layer constituting the skin-adhesive adhesive tape or sheet of the present invention is preferably appropriately determined according to the site to which the skin-adhesive adhesive tape or sheet is applied, the characteristics of the adhesive, etc. It is preferable that it is 20-100 micrometers, More preferably, it is 25-90 micrometers.

  The adhesive tape or sheet for skin application according to the present invention may be perforated within a range that does not impair the effects of the present invention, or may be embossed on the surface of the substrate, as necessary.

  In order to prevent contamination of the surface of the pressure-sensitive adhesive layer, it is preferable that the surface of the pressure-sensitive adhesive layer is covered with a release liner until use. As the release liner, those generally used for an adhesive tape or sheet to be attached to the skin can be used. Specifically, the surface of high-quality paper, glassine paper, parchment paper, etc., coated with a release agent having a release performance such as silicone, or the high-quality paper coated with a resin anchor or polyethylene laminated What coated the release agent which has peeling performances, such as silicone, on the surface can be used.

The adhesive tape or sheet for skin attachment of the present invention is used as a medical adhesive tape or sheet or sanitary material, as an adhesive tape or sheet used for body shape reinforcement or correction in body trimming, or as a sports taping tape. Is preferred. The adhesive tape or sheet for skin application of the present invention exhibits an excellent effect particularly when it is required to be used in water, and follows the skin even when the joint is repeatedly bent or stretched in the water. , Have a feeling of flexibility and fixation and do not peel off.

  The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to these examples, and various applications are possible without departing from the technical idea of the present invention.

Example 1
A mixture of 96 parts by weight of 2-ethylhexyl acrylate and 4 parts by weight of acrylic acid was copolymerized with ethyl acetate under an inert gas atmosphere to obtain an acrylic polymer. A pressure-sensitive adhesive was prepared by adding 0.22 parts by weight of trifunctional isocyanate to 100 parts by weight of the obtained acrylic polymer. Applying the obtained adhesive to the silicone-treated surface of the release liner, in which polyethylene is laminated to fine paper and silicone-treated on the polyethylene surface, the dried thickness is 50 μm, and then dried to form an adhesive layer. Formed. On this adhesive layer, as a substrate, 75 parts by weight of an ethylene-vinyl acetate copolymer (trade name: Ultrasen 5A53A, manufactured by Tosoh Corporation), and polystyrene / vinyl-polystyrene having a styrene content of 20% by weight. A sheet made of 25 parts by weight of an isoprene triblock copolymer (manufactured by Kuraray Co., Ltd., trade name: Hibler 7125) was placed on and bonded together to prepare an adhesive sheet for skin application.
About the obtained adhesive sheet for skin sticking, the following measurement and evaluation were performed. These results are shown in Tables 1-5.

(Example 2)
In Example 1, except that the thickness of the adhesive layer (after drying) was changed to 40 μm, and the base material was changed to a polyether-based urethane sheet (50 μm thickness), the skin application was performed in the same manner as in Example 1. An adhesive sheet was prepared.
About the obtained adhesive sheet for skin sticking, the following measurement and evaluation were performed. These results are shown in Tables 1-5.

(Comparative Example 1)
In Example 1, a pressure-sensitive adhesive sheet for skin application was used in the same manner as in Example 1 except that a soft polyvinyl chloride film (80 μm thick) similar to the base material constituting a commercially available emergency bandage was used as the base material. Was made.
About the obtained adhesive sheet for skin sticking, the following measurement and evaluation were performed. These results are shown in Tables 1-5.

(Comparative Example 2)
In Example 1, the pressure-sensitive adhesive was the same as Example 1 except that an acrylic polymer was prepared using a mixture of 95 parts by weight of 2-ethylhexyl acrylate, 4 parts by weight of acrylic acid and 1 part by weight of methacrylic acid. Was made. This adhesive was applied to a silicone-treated release liner so that the thickness after drying was 85 μm, and the type of substrate was changed to a strong twisted fabric (500 μm thickness). In the same manner as in No. 1, a pressure-sensitive adhesive sheet for skin application was prepared.
About the obtained adhesive sheet for skin sticking, the following measurement and evaluation were performed. These results are shown in Tables 1-5.

(Comparative Example 3)
A Nitrito CB tape (manufactured by Nitto Denko Corporation) commercially available as a general sports tape was prepared. The tape was subjected to the following measurements and evaluations in the same manner as in Example 1. These results are shown in Tables 1-5.

  With respect to the adhesive sheet for skin application obtained in each of the above Examples and Comparative Examples, measurement and evaluation were performed as follows.

<< Measurement method and evaluation method >>
(1) Tensile strength and elongation A sample piece having a width of 19 mm and a length of about 150 mm was taken, and a marked line was put at a length point of 100 mm. This sample piece was pulled at a tensile speed of 300 mm / min, and the tensile stress (unit: N / 19 mm width) when the sample piece was broken was measured and taken as the tensile strength.
Further, the length of the marked line when the sample piece broke was measured, and the value obtained by dividing the original length (100 mm) by percentage (%) was defined as elongation.

(2) 50% modulus A sample piece having a width of 19 mm and a length of about 150 mm was taken, and a marked line was put at a length point of 100 mm. The sample piece was pulled at a pulling speed of 300 mm / min, and when the sample piece was pulled 50%, the stress at that time was measured. This is a 50% modulus (unit: N / 19 mm width).

(3) Stress relaxation rate (Reduction rate of stress after holding 50% elongation for 30 minutes)
A sample piece having a width of 19 mm and a length of about 150 mm was taken, and a marked line was placed at a length of 100 mm. The sample piece is pulled at a speed of 300 mm / min. When the sample piece is pulled 50%, the pulling operation is stopped immediately, and the stress (B) at that time is measured. The stress (A) after holding the sample piece for 30 minutes in a state where it was pulled 50% was measured, and the stress A and the stress B were introduced into the following formula to obtain the stress relaxation rate.

Stress relaxation rate (%) = {(B−A) / B} × 100

(4) Water-resistant adhesive strength A specimen having a width of 19 mm and a length of about 150 mm is cut out. This sample piece was affixed on a bakelite plate by reciprocating a 2 kg rubber roll once. This was left standing in water and held for 30 minutes, then removed from the water, the sample piece was peeled off at a pulling speed of 300 mm / min, and the peel force was measured.

(5) Water-resistant self-back surface adhesive strength A sample piece (A) having a width of 19 mm and a length of about 150 mm and a sample piece (B) larger than this sample piece are cut out. In accordance with Japanese Industrial Standards JIS Z0237, the sample piece (B) is pasted on the bakelite plate in advance, the sample piece (A) is pasted on the back surface, and a 2 kg rubber roll is reciprocated once for pressure pasting. did. This was left standing in water and held for 30 minutes, then removed from the water, the sample piece was peeled off at a pulling speed of 300 mm / min, and the peel force was measured.

(6) Water-resistant expansion and contraction self-back surface adhesion rate Cut two adhesive tapes or sheets for application to the skin into appropriate sizes to obtain test pieces. However, one test piece is cut out to a size of 15 mm width × 100 mm length, and the other test piece is cut out slightly larger than this. The adhesive layer of the smaller test piece was placed on the base surface of the slightly larger test piece, and a 2 kg rubber roll was reciprocated once to apply pressure to make a self-back adhesion sample. The self-back surface adhesive sample is left in water and held for 30 minutes, and then pulled in water at a pulling speed of 300 mm / min. After repeating this pulling operation three times, the area of the peeled part of the self-back surface adhesive sample was measured, divided by the adhesion area (15 × 100 mm ² ), and this value was shown as a percentage.

(7) Contact angle of water 1 μl of distilled water is slowly put from a cylindrical tube so that no stress is applied to the substrate. The angle formed by the water and the substrate was measured.

(8) Waterproofness First, as a test sample piece, a circular sample piece having a diameter of about 40 mm was cut out from an adhesive tape or sheet for skin application. A sample piece was brought into close contact with one port of a cylindrical container having an inner diameter of 25 mm. Next, 100 mL of distilled water was slowly added from the other mouth of the cylindrical container, and the weight (g) of distilled water that passed through the sample piece in 1 minute was measured.

(9) Evaluation of fixation Affixing an adhesive tape or sheet to the skin so that it wraps around the knees of 20 volunteers who are over 30 years of age. ”,“ I feel uncomfortable ”, and“ Very uncomfortable ”. Table 2 shows the number of people corresponding to each evaluation stage. Of the four-level evaluations, the case where “very comfortable” or “no problem” was evaluated was determined to be effective, and the effective rate was calculated from the total number of persons, and is also shown in Table 2.

(10) Evaluation about skin adhesiveness The adhesive sheet for skin sticking was affixed so that it might go around the knee of 20 volunteers whose age is 30 or more, and it kept for 2 hours. After 2 hours, the skin adhesion was evaluated in 4 stages: “completely adhered”, “peeled only at the periphery”, “peeled from the periphery to the middle”, and “peeled”. It was. Table 3 shows the number of people corresponding to each evaluation stage. Of the four-level evaluation, the case where “completely adhered” or “only the peripheral part was peeled” was evaluated as effective, and the effective rate was calculated from the total number of persons, and is also shown in Table 3. It was.

(11) Evaluation of water-resistant skin adhesion An adhesive sheet for skin application was affixed to the knees of 20 volunteers aged 30 or older. Then, it walked for 10 minutes in water. The skin adhesion after walking underwater was evaluated in four stages: “completely adhered”, “peeled only at the periphery”, “peeled from the periphery to the middle”, and “peeled” . Table 4 shows the number of people corresponding to each evaluation stage. Of the four-level evaluation, the case where “completely adhered” or “only the peripheral part was peeled” was evaluated as effective, and the effective rate was calculated from the total number of persons, and is also shown in Table 4. It was.

(12) Evaluation of skin irritation Affixing the adhesive sheet to the skin so that it wraps around the knees of 20 volunteers who are 30 years old or older. Redness disappeared in 1 to 2 hours, “redness disappeared in 1 day”, and “redness” were evaluated. Table 5 shows the number of people corresponding to each evaluation stage. In addition, it is determined that the case where it is evaluated that “the same state as before applying” or “the redness disappeared in 1 to 2 hours” among the four-level evaluation is effective, and the effective rate is obtained from the total number of these persons. Also shown.

As is clear from Tables 1 to 5, the adhesive tape or sheet for skin application of the present invention has an effective rate of 95% or more in all of fixation feeling, skin adhesion, water-resistant skin adhesion, and skin irritation. I understood.
On the other hand, Comparative Example 1 in which the stress relaxation rate is greater than 40%, and the water-resistant self-back surface adhesion rate is less than 90%. 2 and Comparative Example 3 having an elongation of less than 40% and a water-resistant self-back adhesion ratio of less than 90%, one or more of evaluations of fixation feeling, skin adhesion, water-resistant skin adhesion, and skin irritation Undesirable results were obtained, and the effectiveness rate was 55% or less.
That is, the adhesive tape or sheet for skin application of the present invention has flexibility and fixability that can follow the expansion and contraction of the skin due to bending of the application site even in water, and can be overlaid. It is difficult to peel off even underwater.

  The adhesive tape or sheet for skin application of the present invention is suitable as an adhesive tape or sheet used in the medical field, sports field, etc., and is particularly suitable in the underwater sports field. Further, if necessary, it can be cut into an appropriate size, shape, etc. and used as, for example, an emergency bandage, plaster, adhesive bandage, taping tape or the like.

Claims (4)

  A pressure-sensitive adhesive sheet for skin application having an adhesive layer on a stretchable base material having stretchability in at least one direction of length and width, and having a tensile strength of 10 N / 19 mm or more, 180 N in at least one direction of length and width / 19 mm or less, the elongation is 40% or more and 1,300% or less, the 50% modulus is 1.0 N / 19 mm or more and 15.0 N / 19 mm or less, and the stress relaxation rate is 40% or less, And the adhesive tape or sheet | seat for skin sticking characterized by the water-resistant expansion-contraction self-back surface adhesion rate being 90% or more.   The adhesive tape or sheet for skin application according to claim 1, wherein the stretchable base material has an amount of water passing per minute of 10 g or less per circular area having a diameter of 25 mm.   The skin according to claim 1 or 2, wherein the adhesive tape or sheet for affixing to the skin has a water-resistant adhesive strength of 1.0 N / 19 mm or more and a water-resistant self-back adhesive strength of 0.1 N / 19 mm or more. Sticky adhesive tape or sheet.   The skin according to any one of claims 1 to 3, wherein the stretchable base material has a contact angle with water of at least one surface of the stretchable base material of not less than 35 ° and not more than 160 °. Sticky adhesive tape or sheet.