JP3127965B2 - Pressure sensitive adhesive tape and wound surface protection material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive tape to be attached to the skin and a wound surface protecting material. More specifically, it is excellent in moisture permeability, breathability and elasticity, medical adhesive tape,
The present invention relates to a pressure-sensitive adhesive tape that can be suitably used as a cosmetic pressure-sensitive adhesive tape, and a wound surface protective material using the pressure-sensitive adhesive tape.

[0002]

2. Description of the Related Art In recent years, medical adhesive tapes such as adhesive plasters,
Pressure-sensitive adhesive tapes used as cosmetic adhesive tapes and the like have been developed from various materials, and are described in, for example, Japanese Patent Publication No. 57-56509 and Japanese Patent Application Laid-Open No. 62-176839. 2. Description of the Related Art A pressure-sensitive adhesive sheet in which a pressure-sensitive adhesive containing an organopolysiloxane and an alkylarylpolysiloxane raw rubber is laminated on a base material has attracted attention as having excellent heat resistance, water resistance, cold resistance, and the like.

However, since an organopolysiloxane and an alkylarylpolysiloxane raw rubber are used for the pressure-sensitive adhesive of the pressure-sensitive adhesive tape, the pressure-sensitive adhesive tape is peeled off after being adhered to an adherend such as skin. Sometimes, the pressure-sensitive adhesive migrates from the adhesive tape to the adherend, and there is a disadvantage that the pressure-sensitive adhesive adhered to the adherend must be removed after the use of the adhesive tape.

[0004]

Accordingly, the present inventors have focused on the above-mentioned adhesive tape, and have conducted intensive research to develop an adhesive tape in which the pressure-sensitive adhesive does not migrate from the adhesive tape to the adherend. Surprisingly, when a predetermined amount of calcium carbonate is added to the organopolysiloxane pressure-sensitive adhesive, the pressure-sensitive adhesive does not transfer from the adhesive tape to the adherend such as skin. I found that.

The inventors of the present invention have conducted further studies and found that, when a predetermined amount of calcium carbonate and an acrylic adhesive were added to the organopolysiloxane-based pressure-sensitive adhesive, the adhesive strength was further improved. And found that the adhesive did not migrate from the adhesive tape to the skin and the like.

The present invention has been completed based on such findings.

[0007]

According to the present invention, an inorganic filler is provided on one surface of a non-woven fabric made of polyurethane elastic fiber.
-10% by weight and 1 to 10 layers of acrylic pressure-sensitive adhesive
The hygroscopic sheet adhered to a part of the quantity% containing organopolysiloxane-based pressure sensitive adhesive comprising an adhesive layer provided consisting of skin sticking pressure sensitive tape, and the pressure sensitive adhesive tape of the adhesive layer, further The present invention relates to a wound surface protection material obtained by sticking a releasable sheet over the entire surface.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The pressure-sensitive adhesive tape of the present invention comprises a non-woven fabric made of polyurethane elastic fiber and an adhesive layer provided on one surface.

In the present invention, as described above, an organopolysiloxane-based pressure-sensitive adhesive containing 1 to 10% by weight of an inorganic filler is used for the pressure-sensitive adhesive layer. As described above, when the inorganic filler is contained, the pressure-sensitive adhesive tape is applied to the adherend and used, and when the adhesive tape is peeled off, the adhesive does not remain on the adherend. Furthermore, by adding 1 to 10% by weight of an acrylic adhesive together with an inorganic filler to the organopolysiloxane-based pressure-sensitive adhesive, the adhesive strength is further improved without leaving the adhesive on the adherend. Can be achieved.

The organopolysiloxane-based pressure-sensitive adhesive has an excellent property of imparting heat resistance, water resistance, cold resistance, chemical resistance and the like to the obtained pressure-sensitive adhesive tape.

Representative examples of the organopolysiloxane-based pressure-sensitive adhesive include, for example, the following general formula (I):

[0012]

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Wherein R ₁ and R ₂ are each a methyl group or a phenyl group, and n is an integer, represented by the general formula (II):

[0014]

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(Wherein m is an integer) wherein an organopolysiloxane obtained by blending and dehydrating and condensing a silicone resin represented by the formula (1) is dissolved in a solvent. However, the present invention is not limited to this.

In the general formula (I), R ₁ and R ₂ are each a methyl group or a phenyl group,
In order to impart heat resistance to the adhesive layer, the molar ratio of methyl group to phenyl group (methyl group / phenyl group) is 25
/ 75 to 98/2, preferably 85/15 to 95/5.

In the general formulas (I) and (II), n and m cannot be determined unequivocally because they differ depending on the intended use of the pressure-sensitive adhesive tape, but usually, an adhesive layer is formed on a nonwoven fabric. Considering the workability of forming, the viscosity of the pressure-sensitive adhesive is 2000-200000 cP, especially 5000-25000 cP
(25 ° C.).

Examples of the solvent used to dissolve the organopolysiloxane include aromatic organic solvents such as benzene, toluene, xylene and naphtha. The amount of the solvent used is not particularly limited, and may be appropriately determined in consideration of, for example, the workability of forming an adhesive layer on a nonwoven fabric.

Specific examples of the organopolysiloxane-based pressure-sensitive adhesive include, for example, Dow Corning 35
5; PSA 518, PSA 590 manufactured by General Electric
, PSA 595, PSA 6574; YR33 manufactured by Toshiba Silicone Co., Ltd.
40 and the like, which can be suitably used in the present invention.

Further, in order to impart thermosetting property to the pressure-sensitive adhesive and to improve the adhesive property at a high temperature, an organic peroxide such as benzoyl peroxide and dicumyl peroxide is added to the pressure-sensitive adhesive. It is preferable to add about 1.5 to 3% by weight based on the solid content.

The particle diameter of the inorganic filler contained in the organopolysiloxane-based pressure-sensitive adhesive is preferably 1 to 20 μm, more preferably 4 to 12 μm. When the particle size of the inorganic filler is smaller than the above range, the inorganic filler is difficult to be uniformly dispersed in the organopolysiloxane-based pressure-sensitive adhesive due to agglomeration, and when it exceeds the above range. The thickness of the formed adhesive layer is 25 to 30 μm, so that the inorganic filler protrudes on the surface to give a rough feeling, and the sedimentation velocity of the inorganic filler in the organopolysiloxane pressure-sensitive adhesive. And it tends to be difficult to obtain a uniform dispersion state.

Specific examples of the inorganic filler include, for example, calcium carbonate, bentonite, titanium oxide, zinc oxide and carion.
Usually, they are used alone or in combination of two or more.

The content of the inorganic filler in the organopolysiloxane-based pressure-sensitive adhesive is 1 to 10% by weight, preferably 3 to 7% by weight. Such content is 1% by weight
When the amount is less than 10% by weight, the adhesive may remain on the adherend. When the amount exceeds 10% by weight, the cohesive force of the adhesive is improved, but the adhesive force is reduced. Become.

[0024] For the purpose of compensating the weakness of the organopolysiloxane can be said to touch the characteristics of the adhesive tack, said organopolysiloxane-based adhesives Ru for the additional inclusion of acrylic pressure-sensitive adhesive.

A typical example of the acrylic pressure-sensitive adhesive is a copolymer containing 2-ethylhexyl acrylate and butyl acrylate as main components. The mixing ratio of the 2-ethylhexyl acrylate and butyl acrylate is 20:80 to 80:20 by weight, preferably 20:80.
Adjusted to be ~ 40: 60. When the proportion of 2-ethylhexyl acrylate is smaller than the above range, the cohesive strength of the adhesive increases, the cohesive strength decreases, and when the proportion is larger than the above range, the cohesive strength of the pressure-sensitive adhesive increases. Adhesive strength tends to decrease due to excessive reduction. As the monomer component constituting the acrylic pressure-sensitive adhesive, for example, various kinds of polyacrylamide, vinyl carboxylic acid and the like may be blended within a range not exceeding 5% by weight.

The viscosity of the acrylic pressure-sensitive adhesive is 500 points in view of the compatibility with the organopolysiloxane pressure-sensitive adhesive.
It is preferably from 20,000 cP, especially from 1,000 to 10,000 cP (25 ° C.).

It is desirable to adjust the amount of the acrylic pressure-sensitive adhesive to be used so that it is usually contained in the organopolysiloxane pressure-sensitive adhesive in an amount of 1 to 10% by weight, preferably 2 to 7% by weight. When the amount of the acrylic pressure-sensitive adhesive used is less than the above range, the effect of blending is not sufficiently exhibited, and when the amount is more than the above range, the organopolysiloxane pressure-sensitive adhesive is used. For example, a decrease in properties, such as tackiness, of the compound is observed.

In the present invention, as described above, a non-woven fabric made of polyurethane elastic fibers is used as the substrate. Polyurethane elastic fiber has excellent heat resistance (150 ° C or more when in contact with metal), cold resistance (-40 ° C or less), electrical insulation (volume resistivity: 1013Ω · cm or more), moisture permeability, water resistance and chemical resistance It has. Therefore, when the pressure-sensitive adhesive layer having these physical properties is combined with the nonwoven fabric made of the polyurethane elastic fiber, a pressure-sensitive adhesive tape having all the physical properties is obtained.

The nonwoven fabric made of polyurethane elastic fibers used in the present invention is a so-called spunbonded nonwoven fabric in which filaments made of a thermoplastic polyurethane elastomer are accumulated. Usually, the thermoplastic polyurethane elastomer is melted, and the melt is rapidly discharged from a nozzle. It is obtained by jetting into the air, accumulating the obtained filaments, and then cooling. Among such nonwoven fabrics composed of polyurethane elastic fibers, melt-spun polyurethane elastic filaments are laminated without being substantially bundled, the contact points of the laminated filaments are joined by the filaments themselves, and the rigidity of the nonwoven fabric is increased. Those whose degree satisfies the formula: Y <0.2X + 20 (where Y indicates the bristles (mm) and X indicates the basis weight (g / m ² )), are particularly excellent in stretchability, air permeability and flexibility Therefore, it can be suitably used.
In addition, the softness of the nonwoven fabric is specified in JIS L-1096.
A value measured according to the 45-degree cantilever method is shown. In the present invention, when the value is less than 0.2X + 20, the flexibility of the nonwoven fabric is sufficiently large, and thus it is preferable. Particularly preferred softness of the nonwoven fabric is less than 0.2X + 10.

As the thermoplastic polyurethane elastomer, for example, the soft segment is a polyalkylene glycol or a polyalkylene adipate having an alkylene group having 2 to 8 carbon atoms, and the hard segment is a diisocyanate such as diphenylmethane diisocyanate. Examples include a thermoplastic polyurethane elastomer which is a urethane bond formed by a reaction with a molecular diol, and such a polyurethane elastomer is only one example, and the present invention is not limited only to these examples.

The thickness and the basis weight of the nonwoven fabric cannot be determined unconditionally because they have a correlation with the elasticity and the air permeability. For example, if the basis weight of the nonwoven fabric is increased, the air permeability tends to decrease, so that the thickness must be reduced. Therefore, it is desirable to appropriately adjust the thickness and the basis weight of the nonwoven fabric according to the intended use of the obtained pressure-sensitive adhesive tape. When the pressure-sensitive adhesive tape of the present invention is used for, for example, a wound surface protective material, the air permeability of the nonwoven fabric is to prevent the occurrence of unevenness even when applied to the skin or the like. 10 when measured using a Frazier-type tester specified in JIS L-1096.
It is preferably at least 0 ml / cm ² · sec. The thickness of the nonwoven fabric is too small, the tensile strength of the resulting pressure-sensitive adhesive tape is not sufficient, and if it is too thick, the elasticity tends to be too small. So usually 100-700μm, especially 1
Preferably it is 50 to 400 μm. In addition, the basis weight of the nonwoven fabric is usually to give the obtained pressure-sensitive adhesive tape a practically suitable tensile strength and appropriate air permeability,
It is preferably from 10 to 200 g / m ² , especially from 50 to 100 g / m ² .

As the nonwoven fabric, for example, Kanebo Co., Ltd.
Made by Espanshione (registered trademark) ES25A, ES50A, ES
75A, ES85A, ES85A, ES25, ES50, ES150, UH25,
UH50, UH75, UH100, UH125, UHD25, UHD50, UHD75
, UHD100, UHD125, EH25, EH50, EH75, EH85, EH100
, EH125, EH180, etc., all of these nonwoven fabrics have a small stress at 100% elongation of 40 to 470 g / cm, and the recovery rate at that time is about 90% or more,
Breaking strength is 0.1 g / cm or more, elongation at break is 400
% Or more, which is excellent in elasticity and tensile strength and has appropriate air permeability, and thus can be suitably used in the present invention. It should be noted that the present invention can be used, of course, as long as it has the above-mentioned elasticity and tensile strength, and is a nonwoven fabric having an appropriate air permeability, other than those exemplified above. It is.

Further, since the nonwoven fabric becomes soft when heated, the nonwoven fabric is subjected to, for example, embossing under heating to provide an uneven pattern on the surface of the nonwoven fabric by heating. May be provided with an adhesive layer only. In the case where the adhesive layer is provided only on the upper part of the projection as described above,
Since the concave portion does not have an adhesive layer, it can freely expand and contract without adhering to an adherend, so that the elasticity of the pressure-sensitive adhesive tape after application is further improved, which is preferable.

The method for providing the adhesive layer on one surface of the non-woven fabric is not particularly limited.
For example, brush a pressure-sensitive adhesive on one surface of the nonwoven fabric,
After applying by spray coating, knife coating or the like, a method of removing the organic solvent contained in the pressure-sensitive adhesive may be used. When an organic peroxide is added to the pressure-sensitive adhesive, it is preferable to remove the organic solvent and then heat the pressure-sensitive adhesive to about 100 to 120 ° C. to cure it. The thickness of the pressure-sensitive adhesive layer provided on one surface of the nonwoven fabric depends on the type of the pressure-sensitive adhesive,
It depends on the application of the pressure-sensitive adhesive tape to be obtained, etc.
m, preferably 20 to 40 μm.

When the adhesive layer is provided on one surface of the nonwoven fabric, it is preferable that the nonwoven fabric is previously subjected to a water-repellent treatment. When the water-repellent treatment is performed in this manner, it is possible to prevent the adhesive layer from penetrating into the non-woven fabric, thereby preventing the adhesive force from being lowered. When the pressure-sensitive adhesive tape is provided with waterproofness, the surface of the pressure-sensitive adhesive tape on which the adhesive layer is not provided can be subjected to a water-repellent treatment.

The method of performing the water-repellent treatment is not particularly limited, and examples thereof include a method of attaching a water-repellent agent to the nonwoven fabric.

Typical examples of the water repellent include fluorine-based water repellents. Specific examples of such a fluorine-based water repellent treatment agent include, for example, Asahi Glass Co., Ltd.
Asahi Guard AG730 (trade name), Union Chemical Industry Co., Ltd., Yunikapolon LK420 (trade name), Dainippon Ink & Chemicals, Inc. Dickguard X-10 (trade name), Tokai Oil Co., Ltd. TS Guard K317 (trade name) and the like, but the present invention is not limited to only such examples. The amount of the water-repellent agent used cannot be determined unequivocally because it varies depending on the basis weight of the nonwoven fabric, etc., but is usually 0.5 to 10 g / m ² in solid content, preferably 1 to 5 g / m ^2.
It is preferred that the degree is about. When the amount of the water repellent used is less than the above range, the effect of using the water repellent is not sufficiently exhibited, and when the amount is more than the above range, it is more than that. Cannot be expected to improve water repellency, and tend to be less economical.

When the pressure-sensitive adhesive tape of the present invention constituted as described above is used after being adhered to an adherend such as the skin, the adhesive does not remain on the adherend when the adhesive tape is peeled off. by system adhesive agent is contained, it is the further improvement of the adhesive strength can be achieved.

Further, the pressure-sensitive adhesive tape of the present invention is extremely excellent in moisture permeability and air permeability, so that, for example, even when it is applied to the skin of a human body in a high temperature period, it does not easily cause unevenness. In addition, since it is excellent in elasticity, it can be adhered to the joints of the human body, etc., and even when the joints are expanded and contracted, it follows the expansion and contraction of the skin and does not peel off or move away from the skin .

When the pressure-sensitive adhesive tape of the present invention is used, for example, as a material for protecting a wound surface, the pressure-sensitive adhesive tape has a waterproof property and a moisture-permeable property so as not to be damaged by external water or sweat. It is preferable to further improve. For example, in order to prevent sweat, etc.
JIS 90% RH in accordance with Z-0208 (relative humidity), 40 ° C., the moisture permeability when measured under the conditions of 24 hours 1000 g / m ² · 24hrs
It is preferably at least 1500 g / m ² · 24 hrs, more preferably 1800 to 8000 g / m ² · 24 hrs. Such moisture permeability is usually adjusted by the type and amount of the adhesive used in the adhesive layer.

Incidentally, a peelable sheet may be provided on the adhesive surface of the pressure-sensitive adhesive tape of the present invention, if necessary. The releasable sheet is not particularly limited as long as it can be easily peeled off from the adhesive layer, and examples thereof include those in which a silicone-based release agent is coated on the surface of a base material such as paper, cloth, and plastic film. An example of the silicone-based release agent is TDR6600 manufactured by Toshiba Silicone Co., Ltd.

Next, the wound surface protecting material of the present invention will be described.

The wound surface protective material of the present invention is obtained by adhering a hygroscopic sheet to a part of the pressure-sensitive adhesive tape and further adhering a releasable sheet to the whole surface. One embodiment of the wound surface protecting material of the present invention is shown in FIG. FIG. 2 is a cross-sectional view taken along the line II of FIG.

In FIGS. 1 and 2, the pressure-sensitive adhesive tape 3 is constituted by providing an adhesive layer 2 on one surface of a non-woven fabric 1 made of polyurethane elastic fiber. Is provided with a hygroscopic sheet 4, and a releasable sheet 5 is further provided on the hygroscopic sheet 4.

As the hygroscopic sheet 4, a known one can be used. As an example thereof, for example, a woven fabric made of sterilized cotton or cellulosic fiber, a fabric made of a knitted fabric or a nonwoven fabric, and the like,
The present invention is not limited to only such examples. Among these moisture-absorbing sheets, a fabric made of a cotton knitted fabric is particularly preferable because it exhibits moderate elongation. The size of the hygroscopic sheet 4 is usually adjusted so as to be smaller than the pressure-sensitive adhesive tape 3. The position at which the hygroscopic sheet 4 is provided is not particularly limited, and may be, for example, a central portion of the pressure-sensitive adhesive tape 3 as shown in FIG. You may.

Examples of the peelable sheet 5 include the same as those used for the pressure-sensitive adhesive tape 3.
The releasable sheet 5 is usually adhered on the surface of the pressure-sensitive adhesive tape 3 on which the hygroscopic sheet 4 is adhered and fixed on the adhesive layer 2 so as to cover the entire surface of the pressure-sensitive adhesive tape 3.

The pressure-sensitive adhesive tape used in the wound surface protective material of the present invention does not give a feeling of cramping to the skin even when it is applied to, for example, a joint of a human body. The elongation percentage when measured according to the method specified in JIS L-1096 is 50% or more to follow, and 50% to eliminate the slack due to repeated expansion and contraction when attaching to the human body, and to restore the original state after elongation The recovery rate at% elongation is preferably 80% or more.

Next, the pressure-sensitive adhesive tape and wound surface protective material of the present invention will be described in more detail based on Examples.
The present invention is not limited to only such embodiments.

Reference Example 1 97 parts by weight of an organopolysiloxane-based pressure-sensitive adhesive (PSA 6574, manufactured by General Electric Co.) and NN # 500 (calculated by Nitto Powder Chemical Co., Ltd., trade name, particle size: 3) as calcium carbonate 2020 μm, average particle size: 4.44 μm) A mixture obtained by mixing 3 parts by weight so as to be uniform is coated on a silicone-treated surface of a release paper so that the thickness of an adhesive layer after drying is 25 μm by a reverse roll coater method. After application, the adhesive layer was pre-dried at 70 ° C to evaporate the toluene, and further dried at 120 ° C.
For 2 minutes, and then dried and cured. Then, a nonwoven fabric (Kanebo Co., Ltd., Espansione (registered trademark) UHD-7)
5: Weight per unit area 75 g / m ² , base material thickness 300 µm, softness 25-35 m
m) to give a pressure-sensitive adhesive tape.

The physical properties of the obtained pressure-sensitive adhesive tape are 100
% Stress at the time of elongation, recovery rate, elongation at break, and moisture permeability were examined according to the following methods. Table 1 shows the results.

(Stress and recovery rate at 100% elongation) Measured according to JIS L-1096.

(Elongation at break) It was measured according to JIS L-1096.

(Moisture Permeability) Measured under the conditions of 90% RH (relative humidity), 40 ° C. and 24 hours according to JIS Z-0208.

Reference Example 2 97 parts by weight of an organopolysiloxane-based pressure-sensitive adhesive (PSA 6574, manufactured by General Electric) and NN # 500 (calculated by Nitto Powder Chemical Co., Ltd.) as calcium carbonate, trade name, particle size: 3 2020 μm, average particle diameter: 4.44 μm) A mixture obtained by mixing 3 parts by weight so as to be uniform is coated on a silicone-treated surface of a release paper so that the thickness of an adhesive layer after drying is 10 μm by a reverse roll coater method. After application, the adhesive layer was pre-dried at 70 ° C to evaporate the toluene, and further dried at 120 ° C.
For 2 minutes, and then dried and cured. Then, a nonwoven fabric (Kanebo Co., Ltd., Espansione (registered trademark) UHD-7)
5: Weight per unit area 75 g / m ² , base material thickness 300 µm, softness 25-35 m
m) to give a pressure-sensitive adhesive tape.

The physical properties of the obtained pressure-sensitive adhesive tape were measured in Example 1.
It investigated similarly to. Table 1 shows the results.

Comparative Example 1 In Example 1, a polyurethane film (thickness:
A pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that 0.03 mm) was used. The physical properties of the obtained pressure-sensitive adhesive tape were examined in the same manner as in Example 1. Table 1 shows the results.

Comparative Example 2 A pressure-sensitive adhesive tape was prepared in the same manner as in Example 1 except that an acrylic pressure-sensitive adhesive was used instead of the organopolysiloxane pressure-sensitive adhesive. Produced. The physical properties of the obtained pressure-sensitive adhesive tape were examined in the same manner as in Example 1. Table 1 shows the results.

[0058]

[Table 1]

[0059] As is apparent from the results shown in Table 1, participants
Remarks Example pressure-sensitive adhesive tape which is example 1 and 2 can be compared to the pressure-sensitive adhesive tape that has been caught in Comparative Example 1 of conventional clean peeled without leaving an adhesive from the adherend, moreover It can be seen that the material has excellent stress and recovery at 100% elongation, elongation at break, and moisture permeability.

The pressure-sensitive adhesive tape obtained in Reference Examples 1 and 2 was actually applied to the elbow and the arm was expanded and contracted. However, none of the adhesive tapes followed the skin and did not peel off. Also, I did not feel any tightness when expanding or contracting.

On the other hand, it can be seen that the pressure-sensitive adhesive tape obtained in Comparative Example 2 is slightly inferior in moisture permeability.

Next, Reference Examples 1-2 and Comparative Examples 1-2
When the pressure-sensitive adhesive tape obtained in Reference Examples 1 and 2 was affixed to the arm after applying the pressure-sensitive adhesive tape obtained in Example 1 and bathing, the adhesive did not remain on the skin and the skin was peeled off. Without following, it followed the skin sufficiently and did not cause peeling or the like, but with the pressure-sensitive adhesive tape obtained in Comparative Example 1, the adhesive remained on the skin, and the skin peeled and wrinkled, Further, the pressure-sensitive adhesive tape obtained in Comparative Example 2 was inferior in adhesiveness and followability to skin, and peeled off after bathing.

Reference Example 3 The pressure-sensitive adhesive tape obtained in Reference Example 1 was 70 mm × 20
mm, a gauze made of a 25 mm x 15 mm cotton knitted fabric is applied to the center of the cotton with the adhesive layer, and then a release paper coated with a silicone release agent is applied. Then, pressure was applied using a rubber roll to obtain a wound surface protective material.

When the release paper of the wound surface protective material obtained was peeled off and affixed to the elbow, following the expansion and contraction of the skin, there was no peeling between the skin and the skin had a tight feeling. Instead, it became familiar to the skin enough to make you forget that it was affixed at all. Further, the wound surface protective material was peeled off from the skin after use, but no adhesive remained on the skin at all.

REFERENCE EXAMPLE 4 A perfluorooctyl methacrylate / ethyl acrylate / butyl acrylate copolymer (8: 1: 1 molar ratio) was solidified on the nonwoven fabric surface of the wound surface protective material obtained in Reference Example 3 as a water repellent. By applying 2 g / m ^{2 in} terms of minutes, a wound protective material having waterproofness was obtained.

Peeling off the release paper of the obtained wound surface protective material,
The elongation measured according to the method specified in JIS L-1096 was 470%, and the recovery at 50% elongation was 96%.

Next, when the moisture permeability was examined in the same manner as in Reference Examples 1 and 2, the moisture permeability was 2100 to 2500 g / m ² , and there was no peeling after bathing.

From the above, it can be seen that the wound surface protective material obtained in Reference Example 4 satisfies excellent stretchability, moisture permeability and waterproofness at the same time.

Reference Example 5 An organopolysiloxane-based pressure-sensitive adhesive (PSA 6574, manufactured by General Electric Co., Ltd.) was applied on a polyester film (thickness: 50 μm) using calcium carbonate (Nitto Powder Chemical Co., Ltd.).
NN # 500) was applied by a reverse roll coater method so that the thickness after drying was 25 μm, and then pre-dried at 70 ° C. to evaporate toluene,
The coating was further heated at 120 ° C. for 2 minutes and then dried and cured.

The next 25 of the end of the pressure-sensitive adhesive tape obtained
A portion of mm × 25 mm was attached to a stainless steel plate, a vertical load of 1 kg was applied in an atmosphere of 40 ° C., and a time until the stainless steel plate dropped was measured as a holding force. Table 2 shows the results.

Reference Example 6 An organopolysiloxane-based pressure-sensitive adhesive (PSA 6574, manufactured by General Electric Co., Ltd.) was coated on a polyester film (thickness: 50 μm) with calcium carbonate (Nitto Powder Chemical Co., Ltd.).
NN # 500) was applied by a reverse roll coater method so that the thickness of the adhesive layer after drying was 30 μm, and was then pre-dried at 70 ° C. to evaporate the toluene. The coating was further heated at 120 ° C. for 2 minutes and then dried and cured.

Next, the holding force of the pressure-sensitive adhesive tape obtained was
The measurement was performed in the same manner as in Reference Example 5. Table 2 shows the results.

Comparative Example 3 An organopolysiloxane-based pressure-sensitive adhesive (PSA 6574, manufactured by General Electric Co.) was reversed on a polyester film (thickness: 50 μm) so that the dried adhesive layer had a thickness of 25 μm. After coating by a roll coater method, pre-drying is performed at 70 ° C. to evaporate toluene, and
C. for 2 minutes and then dried and cured.

Next, the holding power of the pressure-sensitive adhesive tape obtained was
The measurement was performed in the same manner as in Reference Example 5. Table 2 shows the results.

Comparative Example 4 An organopolysiloxane-based pressure-sensitive adhesive (PSA 6574, manufactured by General Electric Co.) was reversed on a polyester film (thickness: 50 μm) so that the dried adhesive layer had a thickness of 30 μm. After coating by a roll coater method, pre-drying is performed at 70 ° C. to evaporate toluene, and
C. for 2 minutes and then dried and cured.

Next, the holding force of the pressure-sensitive adhesive tape obtained was
The measurement was performed in the same manner as in Reference Example 5. Table 2 shows the results.

[0077]

[Table 2]

[0078] As is apparent from the results shown in Table 2, participants
Improvement of cohesive force of the pressure-sensitive adhesive by incorporating a calcium carbonate as considered Examples 5 and 6 the adhesive is observed, is observed improvement in adhesion.

Example 1 7.83 parts by weight of 2-ethylhexyl acrylate, 19.80 parts by weight of butyl acrylate, 0.84 parts by weight of vinyl carboxylic acid,
An acrylic pressure-sensitive adhesive (viscosity (25 ° C.): 5000 cP) consisting of 0.75 parts by weight of acrylamide and 0.78 parts by weight of vinyl acetate was prepared.

Next, 91 parts by weight of an organopolysiloxane-based pressure-sensitive adhesive (PSA 6574, manufactured by General Electric) and calcium carbonate (NN # 500, manufactured by Nitto Powder Chemical Co., Ltd.)
5 parts by weight and 4 parts by weight of the acrylic pressure-sensitive adhesive obtained above were mixed to obtain a uniform composition to obtain a pressure-sensitive adhesive.

The obtained adhesive was dried by a reverse roll coater method so that the thickness of the adhesive layer after drying became 30 μm (available from Kanebo Co., Ltd., Espansione (registered trademark) UHD-75, (Applied weight: 75 g / m ² , base material thickness: 300 μm) to obtain a pressure-sensitive adhesive tape (Example 1 ).

A pressure-sensitive adhesive tape was obtained in the same manner as above except that no acrylic adhesive was used as a control.

Then, the pressure-sensitive adhesive tape obtained in Example 7 and a control product were affixed to the skin of 20 men and women in their twenties to forties (four men and sixteen women) to be monitored. After peeling, it was examined which adhesive force was greater. as a result,
18 people answered that the pressure-sensitive adhesive tape obtained in Example 1 had higher adhesive strength, 1 person said that the control product had higher adhesive strength, and none said that the adhesiveness was not changed. Was one.

[0084] From the above, in the pressure-sensitive adhesive tape of the present invention, due to blending the acrylic pressure-sensitive adhesive
Thus, it can be seen that the adhesive strength can be improved.

When using either the pressure-sensitive adhesive tape obtained in Example 1 or the control product, when the adhesive was applied to the skin and then peeled off, no adhesive remained on the skin.

Example 2 PSA 6574 as an organopolysiloxane pressure-sensitive adhesive
(Manufactured by General Electric Company, trade name), calcium carbonate (manufactured by Nitto Powder Chemical Co., Ltd., NN # 500) and Example 1
After adjusting the same acrylic pressure-sensitive adhesive as used in step 3 so as to have the composition shown in Table 3, it was peeled off by a reverse roll coater method so that the thickness of the pressure-sensitive adhesive layer after drying became the thickness shown in Table 3. Coated on the siliconized surface of the paper, pre-dried at 70 ° C to evaporate the toluene, further heated at 120 ° C for 2 minutes, dried and cured, and then nonwoven fabric (Kanebo Co., Ltd. (Registered trademark) UHD-75, weight
75 g / m ² , the thickness of the substrate was 300 μm) to obtain a pressure-sensitive adhesive tape.

As a physical property of the obtained pressure-sensitive adhesive tape, a probe tack was examined according to the following method. Table 3 shows the results.

(Probe Tack) A stainless steel cylinder having a diameter of 5 mm was brought into contact with the adhesive surface of the test piece for 10 seconds while applying a contact load of 10 g, and then separated.
The force (g) required to pull the cylinder vertically away from the adhesive surface at 200 mm / min was determined.

[0089]

[Table 3]

[0090] As apparent from the results shown in Table 3, in the present invention, in that it contained an acrylic pressure-sensitive adhesive
Therefore, it can be seen that the probe tack becomes larger than that of the sample containing no acrylic pressure-sensitive adhesive (Experimental Example 4) (Experimental Example 12 ) .

The pressure-sensitive adhesive sheets obtained in Experimental Examples 1 to 12 of the present invention all had practically satisfactory adhesive strength.

Example 3 PSA 6574 as an organopolysiloxane pressure-sensitive adhesive
(Manufactured by General Electric Company, trade name), calcium carbonate (manufactured by Nitto Powder Chemical Co., Ltd., NN # 500) and Example 1
After adjusting the same acrylic pressure-sensitive adhesive as used in the above to have the composition shown in Table 4, the silicone was used as a release paper so that the thickness after drying by the reverse roll coaster method became the thickness shown in Table 4. It was applied on the treated surface, pre-dried at 70 ° C. to evaporate the toluene, and further heated at 120 ° C. for 2 minutes, and then dried and cured.

As a nonwoven fabric, Espandione (registered trademark) UHD-75 (manufactured by Kanebo Co., Ltd., basis weight 75 g / m ² , base material thickness 3
The nonwoven fabric was immersed in a water-repellent treatment agent (Asahi Guard (trade name) AG730, manufactured by Asahi Glass Co., Ltd.), squeezed lightly, and then dried with hot air at 110 ° C. A non-woven fabric having an adhesion amount (solid content) of 1 g / m ² was obtained.

Next, the adhesive layer surface of the release paper obtained above was superimposed on the nonwoven fabric, and the adhesive layer was transferred to the nonwoven fabric to obtain a pressure-sensitive adhesive tape.

As the physical properties of the obtained pressure-sensitive adhesive tape, the adhesive force was examined according to the following method. Table 4 shows the results.
Shown in

A pressure-sensitive adhesive tape prepared in the same manner as described above except that a non-woven fabric not subjected to a water-repellent treatment was used as a control, and the adhesive strength of the pressure-sensitive adhesive tape was examined. Table 4 shows the results.

(Adhesive strength) The surface was washed with acetone, dried sufficiently, and then wiped with a clean dry cloth. The width was about 25 mm, the length was about 125 mm, and the thickness was 2 to 2 mm.
Place a 3 mm phenolic resin test plate in a 25 ° C
Let stand for minutes.

Next, a polyester tape was attached to the non-woven fabric side of the test piece, and the width was adjusted to about 22 mm and the length to about 150 mm.
Quickly paste on 22mm, length about 125mm, immediately weight 2.
A 0 kg rubber roller was reciprocated three times on the test piece at a speed of 300 mm for 1 minute.

After leaving this for 30 minutes, one end is
The test piece was turned back at 0 degree and peeled off from the tip of the test plate by 25 mm. Next, using a tensile tester, the folded part of the test piece is put on the upper part, and the test plate is put on the lower part with a clasp, and 300m for 1 minute
The film was continuously peeled off at a speed of m 2 and the average load was measured. The test was performed on three test pieces, and the average value was defined as the adhesive strength. It is practically necessary that the adhesive strength be 300 g or more.

[0100]

[Table 4]

From the results shown in Table 4, it can be seen that when the nonwoven fabric is subjected to a water-repellent treatment in advance, the adhesive strength is maintained for a long time.

[0102]

The pressure-sensitive adhesive tape of the present invention does not leave an adhesive on the adherend when it is adhered to an adherend such as the skin and then peeled off. There is no need to remove them. Further, pressure-sensitive adhesive tape of the present invention, since the acrylic pressure-sensitive adhesive is contained in the adhesive layer, it is possible to increase the adhesive strength further.

Further, the pressure-sensitive adhesive tape of the present invention is a non-woven fabric comprising a polyurethane elastic fiber having excellent heat resistance, cold resistance, chemical resistance and electrical insulation as a base material, and having an adhesive layer provided on one surface. However, since it is remarkably superior in stretchability, air permeability and moisture permeability as compared with the conventional pressure-sensitive adhesive tape, even if the skin is stuck to the skin for a long time in a high temperature period, for example, It has excellent effects such as not being peeled off, and even if it is attached to places where large elasticity is required, such as the joints of the human body, it will not move even if it is attached, and it will not peel off from the skin and float. To play.

Therefore, the pressure-sensitive adhesive tape of the present invention
It can be widely used as an adhesive tape for electrical insulation, including a medical adhesive tape and a cosmetic adhesive tape. Further, the wound surface protective material of the present invention may be obtained by peeling the releasable sheet and affixing it to the affected part, and is made of a pressure-sensitive adhesive tape having excellent stretchability and air permeability, and thus is adhered to the skin of the human body. It does not cause rash caused by peeling the adhesive surface when it is done, and it does not hinder the movement of the body when pasted on a highly elastic part such as a joint of the human body In addition, the adhesive portion is hardly lifted up, and furthermore, has an excellent effect of not leaving an adhesive on the skin when peeled off after use.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a wound surface protecting material of the present invention.

FIG. 2 is a cross-sectional view taken along line II of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nonwoven fabric 2 Adhesive layer 3 Pressure-sensitive adhesive tape 4 Hygroscopic sheet 5 Releasable sheet

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI B32B 27/00 A61L 15/06 (72) Inventor Soichi Murakami 6-9-3 Kokubunji-cho, Hofu City, Yamaguchi Prefecture (72) Invention Person Yutaka Tanaka 1-25-2, Tomobuchi-cho, Miyakojima-ku, Osaka-shi, Osaka (72) The new inventor Nakamura 3-24-1, Takada, Toshima-ku, Tokyo Inside Taisho Pharmaceutical Co., Ltd. (72) The inventor Masato Nara Tokyo 3-24-1, Takada, Toshima-ku, Tokyo Taisho Pharmaceutical Co., Ltd. (56) Reference JP-A-62-176839 (JP, A) JP-A-58-15580 (JP, A) JP-A-1-118584 (JP) , A) JP-A-61-22855 (JP, A) JP-A-56-49778 (JP, A) JP-A-2-237562 (JP, A) Japanese Utility Model Showa 62-39716 (JP, U) 57-56509 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) C0 9J 7/02 A61F 13/02 A61L 15/06 B32B 27/00

Claims (6)

(57) [Claims] From 1. A inorganic fillers on one surface of a nonwoven fabric made of polyurethane elastic fiber containing 1-10 wt%, and organopolysiloxane pressure-sensitive adhesive containing 1-10% by weight of acrylic pressure-sensitive adhesive skin comprising an adhesive layer is provided to be
Pressure-sensitive adhesive tape worn on the skin . 2. The method of claim 1, wherein the acrylic pressure-sensitive adhesive is 2-ethyl acrylate.
Co-heavy based on luhexyl and butyl acrylate
The pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive tape is made of a united product. 3. The nonwoven fabric is laminated without melt-spun polyurethane elastic filaments being substantially bundled, the contact points of the laminated filaments are joined by the filament itself, and the rigidity of the nonwoven fabric is reduced. 2. The pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive tape satisfies a formula: Y <0.2X + 20 (wherein, Y represents bristles (mm) and X represents basis weight (g / m2)). 4. The pressure-sensitive adhesive tape according to claim 1, wherein the nonwoven fabric has been subjected to a water-repellent treatment. 5. A wound surface protective material comprising a pressure-sensitive adhesive tape according to claim 1, wherein a pressure-sensitive adhesive tape has a hygroscopic sheet adhered to a part of the adhesive layer, and a releasable sheet is adhered to the entire surface. 6. The wound surface protection according to claim 5 , wherein the pressure-sensitive adhesive tape has waterproofness and moisture permeability, has an elongation of 50% or more, and has a recovery at 50% elongation of 80% or more. Wood.