JP4766947B2 - Adhesive sheet - Google Patents

Description

  The present invention relates to a pressure-sensitive adhesive sheet, for example, a pressure-sensitive adhesive sheet used for medical and hygiene materials and a method for producing the same.

The pressure-sensitive adhesive sheet for medical use or hygiene material needs to be able to prevent entry of water, bacteria, viruses, and the like from the outside, and to have flexibility to follow the curved surface and movement of the skin. Therefore, an elastomer film such as polyurethane having high rubber elasticity is generally used as a support for such an adhesive sheet. In addition, pressure-sensitive adhesive sheets for medical and hygiene materials, such as dressing materials, are required to have excellent moisture permeability so that moisture generated by sweating from the skin can be evaporated to the outside. If moisture permeability is poor, moisture generated from the skin is stored between the skin and the pressure-sensitive adhesive layer, causing the adhesive layer to lose its adhesive force, causing the adhesive sheet to lose its fixing function or to be stored on the skin surface. Moisture causes maceration of the skin, and skin damage is likely to occur. Therefore, an extremely thin elastomer film with a low stress is used for a support such as a dressing material, and an elastomer film having a modulus of approximately 10 N / mm ² or less and a thickness of 70 μm or less at about 50% elongation is often used. .

  However, a pressure-sensitive adhesive sheet using an extremely thin elastomer film is inferior in workability during manufacture and operability during application. Therefore, for the purpose of assisting the elastomer film, for example, a pressure-sensitive adhesive layer / elastomer film / carrying film pressure-sensitive adhesive sheet in which an elastomer film is temporarily attached to a carrying film such as a synthetic resin film or paper has been proposed. (See Patent Document 1). And when using this adhesive sheet, after sticking an adhesive layer to a sticking site | part, a support film is peeled and removed from an elastomer film.

  By the way, in the pressure sensitive adhesive sheet as described above, since the carrier film is peeled and removed from the elastomer film at the time of use, it is desirable that the adhesive force between the elastomer film and the carrier film is as small as possible. When the adhesive force between them is too small, there arises a problem that peeling occurs between the elastomer film and the carrier film when the pressure-sensitive adhesive sheet is produced. Therefore, in such a pressure-sensitive adhesive sheet, it is necessary to make the adhesive force between the elastomer film and the carrier film appropriate in consideration of the balance between the peeling operability during use and the workability during production. It is.

  However, the allowable range of adhesive strength that satisfies both the peeling operability during use and the workability during manufacturing is very narrow, so it is extremely difficult to stably adjust the adhesive strength to an appropriate level. It is.

JP 7-16258 A

  The present invention has been made to solve the above-mentioned problems, and the present invention does not easily peel between the elastomer film and the support film during the manufacturing process, and the support film is used when the adhesive sheet is used. It is an object of the present invention to provide a pressure-sensitive adhesive sheet that can be easily peeled and removed from an elastomer film and excellent in workability during production and peeling operability during use, and a method for producing the pressure-sensitive adhesive sheet.

The pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet having a polyurethane film on one surface of a carrier film, and having a pressure-sensitive adhesive layer provided on the polyurethane film, the carrier film comprising polypropylene, polyethylene and ethylene- It consists of resin which contains a vinyl acetate copolymer as a main component.

Here, the pressure-sensitive adhesive layer contains an acrylic polymer as a main component and is compatible with the acrylic polymer and contains a compatible component that is liquid or pasty at room temperature. It is preferably formed from a product.
The compatible component may be a carboxylic acid ester.

  In the present invention, the material forming the polyurethane film may be polyester polyurethane and / or polyether polyurethane.

  The method for producing a pressure-sensitive adhesive sheet of the present invention is characterized in that a carrier film and a polyurethane film are laminated, and a pressure-sensitive adhesive layer separately formed on a release sheet is laminated and bonded to the surface of the polyurethane film, followed by a crosslinking reaction. And

  According to the present invention, the elastomer film and the carrier film do not easily peel off during the production process, and the carrier film can be easily peeled off from the elastomer film when using an adhesive sheet. An adhesive sheet having processability and peeling operability can be provided.

  The pressure-sensitive adhesive sheet of the present invention has a pressure-sensitive adhesive layer on a support. The support has a carrier film on one surface of the polyurethane film. A polyurethane film is preferable because it has good followability to the skin and can impart flexibility to follow the unevenness and expansion / contraction of the skin accompanying bending of the body and the like. Further, the support is preferably one having excellent water vapor permeability so as not to prevent sweating from the skin. For example, polyester polyurethane, polyether polyurethane and the like are preferably used as the material of such a polyurethane film.

  The polyether polyurethane is obtained by reacting a polyol component and a polyisocyanate component. The polyol component constituting the polyether polyurethane preferably contains at least one polyether polyol having a polyoxyalkylene skeleton.

The polyether polyol having a polyoxyalkylene skeleton can be obtained by polymerizing at least one alkylene oxide such as ethylene oxide, propylene oxide, and butylene oxide. The polyether polyol having a polyoxyalkylene skeleton preferably has a molecular weight of 500 to 3,000.
In the present invention, as the polyol component, a polyether polyol having a polyoxyalkylene skeleton and another polyol such as polyoxytetramethylene glycol or a polyol such as butanediol, heptanediol, hexanediol, cyclohexanedimethanol, etc. Can be used by mixing parts.

  A polyether polyurethane formed using a polyol component containing a polyether polyol having a polyoxyalkylene skeleton has low absorbency with respect to a pressure-sensitive adhesive obtained from a carboxylic acid ester described later. The reason for this is not necessarily clear, but when a highly polar polyether structure is present in the polyether polyurethane, the polyether polyurethane can be combined with a highly hydrophobic carboxylic acid ester such as a carboxylic acid ester having 16 or more carbon atoms. This is thought to be due to a decrease in affinity.

  Conventionally known materials can be used as the polyisocyanate component constituting the polyether polyurethane. Examples thereof include aromatic, aliphatic and alicyclic diisocyanates, dimers and trimers of these diisocyanates. Aromatic, aliphatic, and alicyclic diisocyanates include tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate. 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, butane-1,4-diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, cyclohexane-1,4 -Diisocyanate, dicyclohexylmethane-4,4-diisocyanate, 1,3-bis (isocyanatemethyl) cyclohexane, methyl Cyclohexane diisocyanate, m- tetramethylxylylene diisocyanate. Moreover, these dimers, trimers, and polyphenylmethane polyisocyanate are used. Examples of the trimer include isocyanurate type, burette type, and allophanate type, and can be used as appropriate. These polyisocyanates may be used alone or in combination of two or more.

  In the present invention, a chain extender can be further used. As the chain extender, conventionally known materials can be used, and examples thereof include diols such as ethylene glycol, propylene glycol, and butanediol, and diamines such as ethylenediamine, tolylenediamine, and isophoronediamine.

  In the present invention, additives usually used for the film, for example, an ultraviolet absorber, an anti-aging agent, a filler, a pigment, a colorant, a flame retardant, an antistatic agent and the like may be added as necessary. it can. These additives are used in normal amounts depending on the type.

The polyether polyurethane can be polymerized using, for example, a one-shot method or a prepolymer method. Moreover, even if it is bulk polymerization which does not use a solvent, you may superpose | polymerize in a solution for viscosity reduction.
Below, bulk polymerization is demonstrated concretely. Polyol is added to the reaction vessel, and polyisocyanate is added to cause urethanization while adjusting the temperature to 50 to 80 ° C. and stirring. After adding a chain extender and reacting, the reaction product is transferred to a tray and kept at 100 to 150 ° C. for 4 hours or more to complete the reaction, thereby obtaining a bulky polyether polyurethane. it can.

  A film made of polyether polyurethane is formed by pulverizing bulk polyether polyurethane into pellets, melting the resin pellets, and then extruding them into sheets using a T-die extruder or inflation die extruder Is done. In addition, the film extruded into the sheet form is usually wound up. Alternatively, by calendering, a polyether urethane resin is rolled and stretched between two heated rolls, and formed into a sheet, whereby a film made of polyether polyurethane is formed, and the film is wound up as necessary. Further, the resin pellets are dissolved in a solvent such as N, N-dimethylformamide, and this solution is applied onto a release liner such as a polyester film using a bar coater or the like and dried to remove the solvent. A film made of ether polyurethane may be formed.

  In the present invention, the thickness of the polyurethane film is preferably in the range of 10 to 150 μm and preferably in the range of 20 to 70 μm in the case of the pressure-sensitive adhesive sheet used for medical and hygiene materials. Further preferred. When the thickness of the film is less than 10 μm, the film may be broken when applied to the skin or peeled off, and the handling operability may be reduced. On the other hand, if the thickness of the film is thicker than 150 μm, sufficient water vapor permeability may not be obtained or the followability to the skin may be poor. When the pressure-sensitive adhesive sheet is used for dressing applications, the thickness of the polyurethane film is preferably in the range of 20 to 60 μm.

In this invention, what laminated | stacked the support film on the polyurethane film is used as a support body. By laminating the support film, it is possible to improve processability during manufacture of the pressure-sensitive adhesive sheet and operability during sticking.
When the adhesive sheet is applied to the skin, the support film and the elastomer film are preferably transparent or translucent so that the site of skin attachment can be visually confirmed from above the adhesive sheet. The carrier film is preferably one that can impart a high elastic modulus to the elastomer film. For example, the modulus at 50% elongation by a tensile test at room temperature and humidity is ² N / mm ² or more, 200 N / preferably mm ² or less, 8N / mm ² or more, more preferably 50 N / mm ² or less.

  In the present invention, the adhesive strength between the polyurethane film and the carrier film is such that the peel strength before forming the pressure-sensitive adhesive layer (T-shaped peel) is 0.1 N from the viewpoint of processability during production and peelability after sticking. / 40 mm or more and less than 0.5 N / 40 mm, preferably 0.1 N / 40 mm or more and 0.35 N / 40 mm or less. If the peel strength between the polyurethane film and the supporting film before forming the pressure-sensitive adhesive layer is 0.1 N / 40 mm or more and less than 0.5 N / 40 mm, the lifting of the supporting film is not recognized during the manufacturing process.

  The adhesive strength between the polyurethane film and the carrier film is such that the peel strength after forming the pressure-sensitive adhesive layer (90-degree peel) is 0.1 N / 20 mm or more and 0.7 N / 20 mm or less, and 0.1 N / 20 mm. As mentioned above, it is preferable that it is 0.4 N / 20mm or less. When the peel strength after forming the pressure-sensitive adhesive layer is 0.1 N / 20 mm or more and 0.7 N / 20 mm or less, the carrier film can be easily peeled from the polyurethane film when the pressure-sensitive adhesive sheet is used.

The material forming the carrier film is a resin containing polypropylene, polyethylene, and ethylene-vinyl acetate copolymer as main components. In the present invention, the resin forming the carrier film preferably contains 0.1% by mass or more and 1.0% by mass or less of ethylene-vinyl acetate.

The carrier film may be a laminate of two or more layers. In this case, a layer made of a resin mainly containing polypropylene, polyethylene, and ethylene-vinyl acetate copolymer at a position in contact with the pressure-sensitive adhesive layer. Is arranged.

  The pressure-sensitive adhesive sheet of the present invention has a pressure-sensitive adhesive layer on a support, and specifically has a pressure-sensitive adhesive layer on the polyurethane film of the support. The pressure-sensitive adhesive layer can be obtained by mixing an acrylic polymer, a carboxylic acid ester compatible with the acrylic polymer, and a crosslinking agent, and performing a crosslinking treatment.

  Here, the acrylic polymer is obtained by copolymerizing a monomer capable of being copolymerized with (meth) acrylic acid ester as a main component, if necessary. As the (meth) acrylic acid ester, an alkyl group having 2 or more carbon atoms, preferably one having 2 to 18 carbon atoms is preferable. Examples include (meth) acrylic acid ethyl ester, propyl ester, butyl ester, pentyl ester, hexyl ester, octyl ester, nonyl ester, decyl ester, dodecyl ester, and the like. In the present invention, one or more of these (meth) acrylic acid esters are used. These alkyl ester chains may be linear or branched.

  As a monomer copolymerizable with (meth) acrylic acid ester, for example, a monomer containing a carboxyl group such as (meth) acrylic acid, itaconic acid, maleic acid, 2-hydroxyethyl (meth) acrylate, (meth) Monomers containing hydroxyl groups such as 2-hydroxypropyl acrylate, methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, butoxyethyl (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, (meth ) Monomers containing alkoxy groups such as ethoxydiethylene glycol acrylate, monomers such as styrene and styrene derivatives, vinyl acetate and N-vinyl-2-pyrrolidone. One or more of these monomers can be used by copolymerizing with (meth) acrylic acid ester as required.

  The acrylic polymer preferably has a glass transition temperature of 260 ° K or lower. By setting the glass transition temperature of the acrylic polymer to 260 ° K or lower, the skin adhesiveness can be sufficiently expressed, which is desirable as a pressure-sensitive adhesive layer of a pressure-sensitive adhesive sheet for medical use and hygiene materials.

  The acrylic polymer can be obtained by a known polymerization method such as a solution polymerization method, an emulsion polymerization method, or a suspension polymerization method. Moreover, it can obtain by performing radical polymerization using radical polymerization initiators, such as a peroxide type compound and an azo type compound.

  The carboxylic acid ester mixed with the acrylic polymer preferably has 16 or more carbon atoms, and is preferably liquid or pasty at room temperature. However, as the carboxylic acid ester to be used, those on solid such as wax are excluded. This is because if the pressure-sensitive adhesive layer is formed by mixing solid carboxylic acid esters, the adhesiveness of the pressure-sensitive adhesive layer is lowered.

  In the present invention, a gel-like pressure-sensitive adhesive layer can be obtained by mixing an acrylic polymer, a carboxylic acid ester, and a crosslinking agent to form a crosslinked body at least partially. The pressure-sensitive adhesive layer thus obtained can reduce the elastic modulus in the micro-deformation region, and improves the adhesion (wetability) of the surface of the pressure-sensitive adhesive layer with respect to the unevenness of the skin surface. Can exhibit excellent adhesiveness. In addition, when peeling the adhesive sheet, the stress on the skin surface can be relaxed or dispersed, so there is almost no physical irritation to the skin surface during peeling, and the keratin on the skin surface is peeled off. And the like, and the skin damage is extremely small.

  Examples of the carboxylic acid ester preferably used in the present invention include ethyl myristate, isopropyl myristate, isopropyl palmitate, butyl stearate, isopropyl isostearate, hexyl laurate, cetyl lactate, myristyl lactate, diethyl phthalate, phthalate Use monohydric alcohol such as dioctyl acid, octyldodecyl myristate, octyldodecyl oleate, hexyldecyl dimethyloctanoate, cetyl 2-ethylhexanoate, isocetyl 2-ethylhexanoate, stearyl 2-ethylhexanoate, dioctyl succinate Esters, propylene glycol dicaprylate, propylene glycol dicaprate, propylene glycol diisostearate, glyceryl monocaprylate, glyceryl tricaprylate Dihydric or higher polyhydric alcohols such as glyceryl tri-2-ethylhexanoate, glyceryl tricaprate, glyceryl trilaurate, glyceryl triisostearate, glyceryl trioleate, trimethylolpropane tri-2-ethylhexanoate Mention may be made of esters.

  In the present invention, it is preferable to dissolve at least one of the carboxylic acid esters in an acrylic polymer. Although a compounding quantity is not specifically limited, For example, it is preferable to contain carboxylic acid ester within the range of 30-100 mass parts with respect to 100 mass parts of acrylic polymers.

  In the present invention, it is preferable that a crosslinked body is formed on a part of the acrylic polymer in which the carboxylic acid ester is dissolved in order to improve the adhesive property. In order to form a crosslinked body, a crosslinking treatment is performed. For example, a chemical crosslinking treatment may be performed using an organic peroxide, an isocyanate compound, an organic metal salt, a metal chelate compound, an epoxy group-containing compound, or the like. However, physical cross-linking treatment may be performed using ionizing radiation.

  The resin composition forming the pressure-sensitive adhesive layer includes, if necessary, plasticizers such as glycerin and polyethylene glycol, water-soluble or water-absorbing resins such as polyacrylic acid and polyvinylpyrrolidone, rosin, terpene, and petroleum. Various additives such as tackifiers such as various softeners, fillers and pigments can be blended. In particular, when a carboxylic acid ester having an unsaturated bond is used, there is a concern that a change in physical properties may occur due to oxidative degradation due to oxygen in the atmosphere, and the desired properties may not be exhibited. It is preferable to mix | blend an inhibitor in a resin composition.

  The thickness of the pressure-sensitive adhesive layer is preferably set within the range of 10 to 80 μm. If the thickness of the pressure-sensitive adhesive layer is less than 10 μm, sufficient adhesiveness may not be exhibited during application to the skin. If the thickness exceeds 80 μm, the level of water vapor permeability required for a pressure-sensitive adhesive sheet for skin application is obtained. It may not be possible.

In this invention, medical tapes and sheets, such as a bandage, can be formed using this adhesive sheet. For example, the adhesive sheet is cut to an appropriate size to form an adhesive bandage, or a medical tape such as a covering material for covering a wound part, a post-surgical patch, a catheter needle insertion part, a cover material for gauze, etc. Alternatively, a sheet can be formed, or a medical product such as a fixing tape or an instrument holding tape can be formed by combining an adhesive sheet with another base material or the like.
In the present invention, the term “film” includes a sheet, and the term “sheet” includes a film.

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

Example 1
Polyether polyurethane (trade name Rezamine P-210, manufactured by Dainichi Seika Kogyo Co., Ltd.) is heated and melted with a twin screw type kneader, and then the thickness is 30 μm using a T-die type extruder. To form a polyurethane film.
As a supporting film, a polyurethane film formed by overlapping a formed polyurethane film on a film (thickness 40 μm) made of a resin containing polypropylene, polyethylene and an ethylene-vinyl acetate copolymer as a main component, and using a rubber roll, A laminate (support) with a carrier film was produced. It was 0.22 N / 40mm when the peeling strength (T-type peeling) before adhesive layer formation was measured about the obtained laminated body based on the evaluation test mentioned later.

  Next, 100 parts (solid weight) of a solvent-type acrylic pressure-sensitive adhesive mainly composed of a copolymer having a weight fraction of isononyl acrylate, 2-methoxyethyl acrylate and acrylic acid of 65: 30: 5 In contrast, 60 parts of liquid or pasty tricaprylic acid glyceride at room temperature and 0.075 part of a trifunctional isocyanate compound as a crosslinking agent component were mixed and dissolved in toluene to prepare an adhesive solution. . The obtained pressure-sensitive adhesive solution was applied to the release-treated surface of the release sheet so that the thickness after drying was 30 μm, and dried to form a pressure-sensitive adhesive layer. Next, this pressure-sensitive adhesive layer surface was superimposed on the polyurethane film surface of the formed support, and bonded using a rubber roll. Then, it preserve | saved for 3 days in 60 degreeC atmosphere, the bridge | crosslinking reaction of the adhesive layer was completed, and also 25 kGy (gamma) ray was irradiated, and the adhesive sheet was produced.

(Example 2)
In Example 1, the strength of the corona discharge treatment on the laminate surface of the carrier film with the polyurethane film was changed, and the humidity during film formation of the polyurethane film was adjusted to thereby adjust the adhesion between the polyurethane film and the carrier film. A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the force was changed so that the peel strength (T-type peel) was 0.42 N / 40 mm.

(Example 3)
In Example 1, the strength of the corona discharge treatment on the laminate surface of the carrier film with the polyurethane film was changed, and the humidity during film formation of the polyurethane film was adjusted to thereby adjust the adhesion between the polyurethane film and the carrier film. A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the force was changed so that the peel strength (T-type peel) was 0.14 N / 40 mm.

Example 4
In Example 1, the strength of the corona discharge treatment on the laminate surface of the carrier film with the polyurethane film was changed, and the humidity during film formation of the polyurethane film was adjusted to thereby adjust the adhesion between the polyurethane film and the carrier film. A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the force (T-shaped peel) was changed so that the peel strength was 0.17 N / 40 mm.

(Example 5)
In Example 1, the strength of the corona discharge treatment on the laminate surface of the carrier film with the polyurethane film was changed, and the humidity during film formation of the polyurethane film was adjusted to thereby adjust the adhesion between the polyurethane film and the carrier film. A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the force was changed so that the peel strength (T-type peel) was 0.22 N / 40 mm.

(Example 6)
In Example 1, the strength of the corona discharge treatment on the laminate surface of the carrier film with the polyurethane film was changed, and the humidity during film formation of the polyurethane film was adjusted to thereby adjust the adhesion between the polyurethane film and the carrier film. A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the force was changed so that the peel strength (T-type peel) was 0.29 N / 40 mm.

(Example 7)
In Example 1, the strength of the corona discharge treatment on the laminate surface of the carrier film with the polyurethane film was changed, and the humidity during film formation of the polyurethane film was adjusted to thereby adjust the adhesion between the polyurethane film and the carrier film. A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the force was changed so that the peel strength (T-type peel) was 0.35 N / 40 mm.

(Comparative Example 1)
In Example 1, the pressure sensitive adhesive sheet was produced like Example 1 except having changed the carrying film into the film (40 micrometers thickness) except the ethylene-vinyl acetate copolymer component. However, the adhesive strength (T-shaped peel) between the polyurethane film and the carrier film was 0.20 N / 40 mm before the pressure-sensitive adhesive layer was formed.

(Comparative Example 2)
In Comparative Example 1, the strength of the corona discharge treatment on the laminated surface of the carrier film with the polyurethane film was changed, and the humidity at the time of film formation of the polyurethane film was adjusted, whereby the adhesive force between the polyurethane film and the carrier film was increased. A pressure-sensitive adhesive sheet was prepared in the same manner as in Comparative Example 1 except that the peel strength (T-shaped peel) before forming the pressure-sensitive adhesive layer was changed to 0.22 N / 40 mm .

(Comparative Example 3)
In Comparative Example 1, the strength of the corona discharge treatment on the laminated surface of the carrier film with the polyurethane film was changed, and the humidity at the time of film formation of the polyurethane film was adjusted, whereby the adhesive force between the polyurethane film and the carrier film was increased. A pressure-sensitive adhesive sheet was prepared in the same manner as in Comparative Example 1 except that the peel strength (T-shaped peel) before forming the pressure-sensitive adhesive layer was changed to 0.29 N / 40 mm .

(Comparative Example 4)
In Comparative Example 1, the strength of the corona discharge treatment on the laminated surface of the carrier film with the polyurethane film was changed, and the humidity at the time of film formation of the polyurethane film was adjusted, whereby the adhesive force between the polyurethane film and the carrier film was increased. A pressure-sensitive adhesive sheet was prepared in the same manner as in Comparative Example 1 except that the peel strength (T-shaped peel) before forming the pressure-sensitive adhesive layer was changed to 0.15 N / 40 mm .

(Evaluation test)
About the adhesive sheet obtained in Examples 1-7 and Comparative Examples 1-4, the evaluation test shown below was done. The results are shown in Table 1.

(1) Peeling force before forming the pressure-sensitive adhesive layer In the laminate before forming the pressure-sensitive adhesive layer, the peeling force between the polyurethane film and the carrier film was measured according to Japanese Industrial Standard JIS K6854-3 (1999). . That is, the laminate is cut into a size of 40 mm × 100 mm, the ends of the polyurethane film and the carrier film of the laminate are grasped, and the peeling rate is 300 mm / min using a tensile tester under normal temperature and humidity conditions. Mold peeling was performed, and the peeling force at that time was measured.

(2) Peeling force after forming the pressure-sensitive adhesive layer In the pressure-sensitive adhesive sheet with a release sheet after forming the pressure-sensitive adhesive layer, the peeling force between the polyurethane film and the carrier film is measured according to Japanese Industrial Standard JIS K6854-1 (1999). did. That is, the pressure-sensitive adhesive sheet with a release sheet after being stored at 60 ° C. for 24 hours after production is cut into a size of 20 mm × 100 mm, the release sheet is peeled off, and the pressure-sensitive adhesive layer surface is affixed to the surface of a smooth aluminum plate and fixed. did. Next, the edge of the carrier film in the fixed adhesive sheet is grasped, and the angle between the polyurethane film and the peeled carrier film is 90 degrees at a peeling speed of 300 mm / min using a tensile tester under normal temperature and humidity conditions. Peeling at 90 degrees was performed, and the peeling force at that time was measured.

(3) Manufacturing processability Manufacturing processability was evaluated about the adhesive sheet. That is, a pressure-sensitive adhesive layer was formed on the release-treated surface of the release sheet in the same manner as in Example 1, and this pressure-sensitive adhesive layer was stacked on the polyurethane film surface of the obtained laminate, and a pressure-sensitive adhesive sheet was formed using a rubber roll. . At this time, it was visually observed whether or not the carrier film was lifted from the polyurethane film surface. A symbol “◯” indicates that no lifting of the carrier film was observed from the surface of the polyurethane film, and a symbol “×” indicates that a carrier film was slightly lifted.

(4) Peeling operability Peeling operability during the use of the pressure-sensitive adhesive sheet was evaluated. That is, the pressure-sensitive adhesive sheet with a release sheet was cut into a size of 50 mm × 50 mm, and after removing the release sheet, it was attached to the inner side of the forearm. Subsequently, the supporting film was peeled off immediately after sticking. The ease of peeling of the carrier film was evaluated based on the following criteria. That is, the symbol “◯” indicates that the carrier film could be easily peeled off, the symbol “Δ” indicates that the carrier film could be peeled, and the symbol “x” indicates that the carrier film was in close contact with the polyurethane film and was difficult to peel off. .

As is apparent from Table 1, it was found that the pressure-sensitive adhesive sheets of Examples 1 to 7 of the present invention were excellent in both processability and peeling operability during production. In addition, the pressure-sensitive adhesive sheet of Example 2 was slightly inferior to other examples in the peeling operability at the time of manufacture, but was peelable.
On the other hand, it turned out that the adhesive sheet of Comparative Examples 1-3 was inferior to peeling operativity. Note that the pressure-sensitive adhesive sheet of Comparative Example 4 has a large variation in peeling force before and after the formation of the pressure-sensitive adhesive layer, and practically has a possibility of causing poor operability.

  That is, according to this invention, the adhesive sheet which has the softness | flexibility which can follow the curved surface and movement of skin was able to be obtained. In addition, according to the present invention, good processability at the time of production is achieved and used when the peeling force before forming the pressure-sensitive adhesive layer (T-shaped peeling) is at least in the range of 0.1 N / 40 mm to 0.5 N / 40 mm. In doing so, it was found that the adhesive force was reduced and good peeling operability could be achieved, and the applicable range of peeling force was wide. Therefore, it becomes easy to adjust the adhesive force that makes it possible to exhibit both characteristics of manufacturing processability and peeling operability, and the pressure-sensitive adhesive sheet having both characteristics can be easily designed.

  On the other hand, in the configuration outside the present invention, the peeling force before forming the pressure-sensitive adhesive layer (T-type peeling) is barely 0.15 N / 40 mm, and the carrier film can be peeled off. However, the peeling force before forming the pressure-sensitive adhesive layer (T It was found that when the shape peeling was 0.20 N / 40 mm, the carrier film was in close contact with the urethane film and it was difficult to peel off, and the allowable range of appropriate peeling force was extremely narrow.

  Medical tapes and sheets such as adhesive bandages can be formed using the pressure-sensitive adhesive sheet of the present invention. Moreover, medical products, such as a fixing tape and an instrument holding tape, can be obtained by combining an adhesive sheet with another substrate.

Claims (5)

A pressure-sensitive adhesive sheet having a polyurethane film on one surface of a carrier film and having a pressure-sensitive adhesive layer provided on the polyurethane film, wherein the carrier film mainly comprises polypropylene, polyethylene, and an ethylene-vinyl acetate copolymer. A pressure-sensitive adhesive sheet comprising a resin contained as a component.   The pressure-sensitive adhesive layer is formed from a composition containing an acrylic polymer as a main component and a compatible component that is compatible with the acrylic polymer and is liquid or pasty at room temperature. The pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive sheet is formed.   The pressure-sensitive adhesive sheet according to claim 1, wherein the compatible component is a carboxylic acid ester.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 3, wherein the material forming the polyurethane film is polyester polyurethane and / or polyether polyurethane. The pressure-sensitive adhesive sheet according to any one of claims 1 to 4, wherein the resin forming the carrier film contains 0.1 to 1.0% by mass of ethylene-vinyl acetate.