JPH0783743B2 - Medical conductive adhesive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a conductive adhesive for medical use which is excellent in conductivity, adhesiveness, cohesiveness and moisture resistance and does not cause skin irritation.

(Prior art) When using an electric medical device such as an electrocardiogram, an electromyogram, an electroencephalograph, a low-frequency therapy device, or a surgical electrosurgical unit, contact the signal electrode or ground electrode with the living body It is performed to electrically connect a predetermined place with these devices and to ground a living body. Conductive pressure-sensitive adhesives of various compositions have been proposed as mediators between such living bodies and electrodes.

For example, the conductive pressure-sensitive adhesive disclosed in JP-A-52-95895 comprises an ester of an α, β-olefinically unsaturated carboxylic acid and a monohydric or polyhydric alcohol having a quaternary ammonium group at the terminal. Contains polymer and polyhydric alcohol.

The conductive pressure-sensitive adhesive disclosed in JP-A-56-36939 is a salt of an organic carboxylic acid such as (meth) acrylic acid or maleic acid (alkali metal salt, amine salt, etc.) at a ratio of 5 mol% or more. It contains a polymer containing and a polyhydric alcohol.

The conductive pressure-sensitive adhesive disclosed in JP-A-56-36940 contains a nonionic hydrophilic polymer such as polyacrylic acid and polyvinyl alcohol, and a water-soluble softening agent such as glycerin.

The conductive pressure-sensitive adhesive disclosed in JP-A-63-92638 is (A) a polymer having (anhydrous) maleic acid and / or maleic acid salt and / or maleic acid partial ester in the molecule, and (B) Polyhydric alcohol such as glycerin,
(C) A polyfunctional epoxy compound such as ethylene glycol diglycidyl ether, (D) a low molecular weight electrolyte such as NaCl, (E) a neutralizing agent such as NaOH and triethanolamine, and water.

However, the conductive adhesives according to the prior art including the above four examples have insufficient internal cohesive force and insufficient adhesiveness. Therefore, there is a drawback that the living body and the pressure-sensitive adhesive cannot be firmly adhered to each other, and a residual amount of the pressure-sensitive adhesive remains when the adhesive is attached and detached. Furthermore, any of the conductive adhesives has poor moisture resistance, and, for example, when used under high humidity, the adhesiveness decreases and the adhesive peels off in a short time, or the fluidity of the adhesive becomes excessive and the electrode becomes It has the drawback of causing poor adhesion between the skin and the skin. In addition, JP-A-63-92683
When it is necessary to include water in the adhesive, such as the electrically conductive adhesive disclosed in Japanese Patent Publication No. JP-A-2003-264, the conductivity and the adhesiveness change due to the evaporation of water during the use or storage of the electrode, resulting in an electrical change. In addition to having the disadvantage of affecting the performance, it is expensive because it requires special packaging to prevent water evaporation.

(Problems to be Solved by the Invention) The present invention is to solve the above-mentioned conventional drawbacks, and an object thereof is to be used in various medical electric devices and the like, and having excellent conductivity, tackiness and moisture resistance. Another object of the present invention is to provide a conductive pressure-sensitive adhesive that has properties and does not irritate the skin and can be provided at low cost.

(Means for Solving the Problems) The conductive adhesive of the present invention is a blended polymer of vinylpyrrolidone (co) polymer and (meth) acrylic acid (salt)-(meth) acrylic acid alkyl ester copolymer, A medical conductive pressure-sensitive adhesive containing an electrolyte and a softening agent, wherein the (meth) acrylic acid (salt)-(meth) acrylic acid alkyl ester copolymer is copolymerized with (meth) acrylic acid (salt). 5 to 90 mol% is contained as a coalescing component, and the (meth) acrylic acid (salt)-(meth) acrylic acid alkyl ester copolymer is contained in the blend polymer in an amount of 1 to 30% by weight.
It is contained in a weight percentage, whereby the above object is achieved.

That is, a vinylpyrrolidone (co) polymer, a pressure-sensitive adhesive composed of an electrolyte and a softening agent (pressure-sensitive adhesive component I) has no irritation to the skin and has good conductivity, but poor moisture resistance.
Since it has a weak internal cohesive force and causes troubles during attachment and detachment, it is not preferable as a medical conductive adhesive. This adhesive component I
By blending (meth) acrylic acid (salt)-(meth) acrylic acid alkyl ester copolymer with the above, the adhesive component I has excellent original properties, that is, non-irritating to the skin and good conductivity. As a result, they have found that the moisture resistance and the internal cohesive force can be enhanced, and have reached the present invention.

Further, it was discovered that by adding an organic carboxylic acid (salt) to the pressure-sensitive adhesive containing the blend polymer of the invention and the electrolyte and the softening agent, the moisture resistance and the internal cohesive force can be further enhanced.

Examples of the vinylpyrrolidone (co) polymer include a vinylpyrrolidone homopolymer, a copolymer of vinylpyrrolidone and one or more kinds of acrylic acid, methyl methacrylate, maleic anhydride, vinyl alcohol and the like. As such a vinylpyrrolidone (co) polymer, those soluble in water and / or alcohol are preferably used, and by adding a softening agent, internal cohesive force is weak but tackiness is obtained. There is a need. Further, the content of vinylpyrrolidone in the copolymer has excellent properties as a pressure-sensitive adhesive, that is, non-irritating to the skin and good conductivity, and (meth) acrylic acid (salt)-( 70% to increase moisture resistance and internal cohesion by blending with (meth) acrylic acid alkyl ester copolymer
It is preferably at least 90 mol%, more preferably at least 90 mol%.

The (meth) acrylic acid (salt)-(meth) acrylic acid alkyl ester copolymer is obtained by copolymerizing (meth) acrylic acid (salt) and (meth) acrylic acid alkyl ester. As the (meth) acrylic acid (salt), for example,
Examples thereof include alkyl acid and methacrylic acid. Examples of the (meth) acrylic acid alkyl ester include (meth)
Examples thereof include methyl acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate.

The reason why the addition of the (meth) acrylic acid (salt)-(meth) acrylic acid alkyl ester copolymer markedly enhances the moisture resistance and the internal cohesive force is not understood in detail, but the carboxylic acid of the copolymer and , Vinylpyrrolidone (co) polymer is considered to interact unexpectedly with the pyrrolidone ring. In order to obtain the desired effect of addition, it is necessary that the vinylpyrrolidone (co) polymer and the polymer are compatible with each other in the compounding solution, and therefore, they are soluble in water and / or alcohol having a pH of 4 or more. Preferably there is. If the content of (meth) acrylic acid (salt) as a copolymerization component of the copolymer is less than 5 mol%, the effect of enhancing the moisture resistance and internal cohesive force of the pressure-sensitive adhesive cannot be obtained, and 90 mol%
If it exceeds, it is difficult to obtain a uniform solution by gelling the mixed solution, so it is limited to 5 mol% to 90 mol%, and further 20 mol%
-80 mol% is more preferred.

When the content of the (meth) acrylic acid (salt)-(meth) acrylic acid alkyl ester copolymer in the blended polymer is less than 1% by weight, the effect of enhancing the moisture resistance and the internal cohesive force cannot be obtained. When it exceeds 30% by weight, the above-mentioned original excellent properties of the polyvinylpyrrolidone (co) polymer are lost, so that it is limited to the range of 1% by weight to 30% by weight, and further 5% by weight to 25% by weight is more preferable. It is suitable.

Examples of the organic carboxylic acid (salt) include acetic acid, stearic acid, fumaric acid, maleic acid, citric acid, phthalic acid, polyacrylic acid, and their sodium salts, potassium salts, calcium salts and the like. The amount added to 100 parts by weight of the blended polymer is 0.1 parts by weight to 20 parts by weight, preferably 1 part by weight to 10 parts by weight. If the amount is less than 0.1 parts by weight, the effect of addition is difficult to be exhibited. It becomes oversaturated and crystal precipitation easily occurs.

The softening agent is for softening the blended polymer, but is more preferably at the same time having a property of solubilizing the electrolyte. For example, a polyhydric alcohol, a polyhydric alcohol derivative or the like having a high boiling point in water. A hydrophilic or hydrophilic liquid is preferred. Specifically, ethylene glycol,
Examples include propylene glycol, dipropylene glycol, polyethylene glycol and glycerin. The amount added to 100 parts by weight of the blended polymer is 20 parts by weight to 500 parts by weight, preferably 50 parts by weight to 300 parts by weight, and if it is less than 20 parts by weight, the softening effect is not sufficient, and if it exceeds 500 parts by weight, bleed out occurs. Easier to do.

The electrolyte contains another component, vinylpyrrolidone (co).
Since the polymer, (meth) acrylic acid (salt)-(meth) acrylic acid alkyl ester copolymer, and softening agent have low conductivity, they are added for the purpose of imparting conductivity to the adhesive, The higher the mobility in the adhesive, the better the conductivity,
For example, inorganic salts such as NaCL, KCL and CaCL ₂ are suitable. The amount added to 100 parts by weight of the blend polymer is 0.1 parts by weight to 30 parts by weight, preferably 1 part by weight to 20 parts by weight.
If it is less than 30 parts by weight, the conductivity is difficult to develop, and if it exceeds 30 parts by weight, it becomes supersaturated in the pressure-sensitive adhesive and crystal precipitation or the like is likely to occur.

Further, the pressure-sensitive adhesive of the present invention may contain a medicinal component, an additive (for example, a bactericide, a fragrance, a coloring agent, etc.) or the like, if necessary.

(Examples) The present invention will be specifically described with reference to Examples.

Example 1 (A) Preparation of adhesive solution: vinylpyrrolidone homopolymer (manufactured by BASFS, Kollidon 9
0) 90 parts by weight were uniformly dissolved in 200 parts by weight of methanol (solution I). 1 part by weight of NaCL was dissolved in 10 parts by weight of purified water of JP (solution II). 10 parts by weight of a methacrylic acid-methyl methacrylate copolymer [manufactured by Rohm Pharma, Euidragit S (methacrylic acid content 25.0 to 34.5%)] was dissolved in 50 parts by weight of methanol (solution III). The above solutions I, II, III and 300 parts by weight of glycerin (manufactured by NOF CORPORATION, Japanese Standard) were uniformly mixed to obtain a colorless and transparent adhesive solution.

(B) Preparation of pressure-sensitive adhesive sheet and performance evaluation of pressure-sensitive adhesive force: The pressure-sensitive adhesive solution obtained in (A) was applied onto a polyethylene terephthalate (PET) / ethylene-vinyl acetate copolymer (EVA) laminated film having a thickness of 32 μm. Then, the adhesive sheet was obtained by casting and drying so that the thickness after drying was 1 mm or more. This pressure-sensitive adhesive sheet was cut into a size of 4 cm × 4 cm and stuck on the skin surface for 6 hours, but the pressure-sensitive adhesive sheet was not peeled off due to exercise in daily life. When this sheet was peeled off, the adhesive layer was peeled off from the skin surface while being temporarily stretched. At the time of exfoliation, excessive adhesion was felt on the skin, but exfoliation of the stratum corneum and inflammation of the skin were not observed. Moreover, the phenomenon that part of the adhesive remained on the skin surface after peeling was not observed.

Measure the adhesive force substitution characteristic value (holding force) according to the Japanese Industrial Standard "Adhesive tape / adhesive sheet (Z 0237 _-1980 )" by making the above adhesive sheet into a tape shape cut into 2.5 cm x 5.0 cm. did. The value is 30 minutes or more, indicating that the internal cohesive force is sufficient. Also, use an adhesive sheet
The tape is cut into 1.5 cm x 20.0 cm, and the Japanese Industrial Standard "Adhesive tape / sheet (Z 023
7 _-1980 ) ”, and the adhesive force substitution characteristic value (180 ° folding peeling method) was measured. The value was 800 g / 15 mm or more.

(C) Evaluation of conductivity of pressure-sensitive adhesive layer: The pressure-sensitive adhesive solution obtained in the item (A) was cast on a silicone release paper so that the thickness after drying was 1 mm, and dried.
This pressure-sensitive adhesive layer was cut into 2 cm × 2 cm, and sandwiched with two 10 cm × 10 cm copper foils (60 μm) from both sides to obtain a sandwich-shaped test piece. Using this test piece, the impedance between the two copper foils was measured by an LCR meter under the conditions of 1 KHz, 10 mV and a contact pressure of 100 g / cm ² , and the value was 264Ω.

Example 2 (A) Preparation of adhesive solution: vinylpyrrolidone homopolymer (Kollidon 9 manufactured by BASFS)
0) 90 parts by weight were uniformly dissolved in 200 parts by weight of methanol (solution I). 2 parts by weight of 3Na citric acid and 1 part by weight of NaCL were dissolved in 10 parts by weight of purified water of JP (solution II). Methacrylic acid-methyl methacrylate copolymer [manufactured by Rohm Pharma, Eui
dragit S (methacrylic acid content 25.0 to 34.5%)] was dissolved in 50 parts by weight of methanol (solution III). The above solutions I, II, III and 300 parts by weight of glycerin (manufactured by NOF CORPORATION, Japanese Standard) were uniformly mixed to obtain a colorless and transparent adhesive solution.

(B) Preparation of pressure-sensitive adhesive sheet and performance evaluation of pressure-sensitive adhesive force: The pressure-sensitive adhesive solution obtained in the section of this Example (A) was used in Example 1
An adhesive sheet was prepared in the same manner as in the item (B), and the adhesive strength was evaluated. The results were similar to those in Example 1 (B). However, the adhesive force substitution characteristic value (holding force) is 50 minutes or more, and the adhesive force substitution characteristic value (180 ° fold back peeling method)
Was over 800 g / 15 mm.

(C) Evaluation of Conductivity of Adhesive Layer: Using the adhesive solution obtained in the section of this Example (A), Example 1
The impedance was measured by the same method as in the item (C). The impedance of the test piece was 237Ω.

Examples 3 to 9, Comparative Examples 1 and 2 (A) Preparation of Adhesive Solution: A methacrylic acid-methyl methacrylate copolymer was prepared by changing the methacrylic acid content at the ratio shown in Table 1, and each copolymer was prepared. Nine types of adhesive solutions were prepared in the same manner as in Example 1 except that the polymer was used.

(B) Preparation of pressure-sensitive adhesive sheet and performance evaluation of pressure-sensitive adhesive force: Using the pressure-sensitive adhesive solutions obtained in this Example and Comparative Example (A), a pressure-sensitive adhesive sheet was prepared in the same manner as in Example 1 (B). Was prepared and the adhesive strength (holding power) was evaluated. The results are shown in Table 1.

From the above, the (meth) acrylic acid content of the (meth) acrylic acid- (meth) acrylic acid ester copolymer having internal cohesive force and obtaining a uniform solution is 5 mol% to 90 mol%, 20 mol% to 80 mol% is more preferable.

Examples 10 to 16 and Comparative Examples 3 and 4 (A) Preparation of Adhesive Solution: Amount of vinylpyrrolidone homopolymer and methacrylic acid-
A pressure-sensitive adhesive solution was prepared in the same manner as in Example 1 except that the blend polymer obtained by blending the amount of the methyl methacrylate copolymer in the proportion shown in Table 2 was used.

(B) Preparation of pressure-sensitive adhesive sheet and performance evaluation of pressure-sensitive adhesive force: Using the respective pressure-sensitive adhesive solutions obtained in this Example and Comparative Example (A), a pressure-sensitive adhesive sheet was prepared in the same manner as in Example 1 (B). Was prepared, and the adhesiveness to the skin and the adhesive strength (holding power) were evaluated. The results are shown in Table 2.

From the above, the amount of (meth) acrylic acid- (meth) acrylic acid ester copolymer in the blended polymer having internal cohesive force and maintaining the original excellent properties of the vinylpyrrolidone (co) polymer is 1% by weight. % To 30% by weight,
More preferred is 5% to 25% by weight.

Example 17 (A) Preparation of adhesive solution: vinylpyrrolidone homopolymer (manufactured by BASF, Kollidon 9
0) 75 parts by weight were uniformly dissolved in 200 parts by weight of methanol (solution I). 1 part by weight of NaCL was dissolved in 10 parts by weight of purified water of JP (solution II). Methacrylic acid-methyl methacrylate copolymer (manufactured by Rohm Pharma, Euidragit L100-55 (methacrylic acid content 38 to 52%)) 25 parts by weight methanol 50
Dissolved in 1 part by weight (solution III). Solution I, II, III
Further, 250 parts by weight of polyethylene glycol 600 (manufactured by NOF CORPORATION, standards outside Japan) were uniformly mixed to obtain a colorless and transparent adhesive solution.

(B) Preparation of pressure-sensitive adhesive sheet and performance evaluation of pressure-sensitive adhesive force: The pressure-sensitive adhesive solution obtained in the section of this Example (A) was used in Example 1
An adhesive sheet was prepared in the same manner as in the item (B), and the adhesive strength was evaluated. The results were similar to those in Example 1 (B). However, the adhesive force substitute characteristic value (holding force) is 30 minutes or more, and the adhesive force substitute characteristic value (180 ° fold back peeling method)
Was over 700g / 15mm.

(C) Evaluation of Conductivity of Adhesive Layer: Using the adhesive solution obtained in the section of this Example (A), Example 1
The impedance was measured by the same method as in the item (C). The impedance of the test piece was 269Ω.

Example 18 (A) Preparation of adhesive solution: vinylpyrrolidone homopolymer (manufactured by BASF, Kollidon 9
0) 75 parts by weight were uniformly dissolved in 200 parts by weight of methanol (solution I). 2 parts by weight of maleic acid 2Na and 1 part by weight of NaCL were dissolved in 10 parts by weight of purified water of JP (solution II). Methacrylic acid-ethyl acrylate copolymer [Rohm Pharma, Euidr
agit L100-55 (methacrylic acid content 38 to 52%)] 25 parts by weight was dissolved in 50 parts by weight of methanol (solution III). Solution I, II, III and polyethylene glycol 600
250 parts by weight (manufactured by Nippon Oil & Fats, Non-Japanese Standard) were uniformly mixed to obtain a colorless and transparent adhesive solution.

(B) Preparation of pressure-sensitive adhesive sheet and performance evaluation of pressure-sensitive adhesive force: The pressure-sensitive adhesive solution obtained in the section of this Example (A) was used in Example 1
An adhesive sheet was prepared in the same manner as in the item (B), and the adhesive strength was evaluated. The results were similar to those in Example 1 (B). However, the adhesive force substitution characteristic value (holding force) is 50 minutes or more, and the adhesive force substitution characteristic value (180 ° fold back peeling method)
Was over 700g / 15mm.

(C) Evaluation of Conductivity of Adhesive Layer: Using the adhesive solution obtained in the section of this Example (A), Example 1
The impedance was measured by the same method as in the item (C). The impedance of the test piece was 312Ω.

Example 19 (A) Preparation of adhesive solution: vinylpyrrolidone homopolymer (manufactured by BASF, Kollidon 9
0) 95 parts by weight were uniformly dissolved in 200 parts by weight of methanol (solution I). 1 part by weight of NaCL was dissolved in 10 parts by weight of purified water of JP (solution II). Methacrylic acid-methyl methacrylate copolymer [Rohm Pharma, Euidragit L100 (methacrylic acid content 38.0 to 52.0%)] 5 parts by weight methanol 20
Dissolved in 1 part by weight (solution III). Solution I, II, III
Further, 250 parts by weight of glycerin (manufactured by NOF CORPORATION, Non-Japanese Standards) were uniformly mixed to obtain a colorless and transparent adhesive solution.

(B) Preparation of pressure-sensitive adhesive sheet and performance evaluation of pressure-sensitive adhesive force: The pressure-sensitive adhesive solution obtained in the section of this Example (A) was used in Example 1
An adhesive sheet was prepared in the same manner as in the item (B), and the adhesive strength was evaluated. The results were similar to those in Example 1 (B). However, the adhesive force substitute characteristic value (holding force) is 30 minutes or more, and the adhesive force substitute characteristic value (180 ° fold back peeling method)
Was 891 g / 15 mm or more.

(C) Evaluation of Conductivity of Adhesive Layer: Using the adhesive solution obtained in the section of this Example (A), Example 1
The impedance was measured by the same method as in the item (C). The impedance of the test piece was 228Ω.

Example 20 (A) Preparation of adhesive solution: A vinylpyrrolidone-methylmethacrylate copolymer (molar ratio: 95: 5) was prepared, and 95 parts by weight of this copolymer was uniformly dissolved in 200 parts by weight of methanol ( Solution I). 10 parts by weight of KCL and 5 parts by weight of sodium acetate were dissolved in 50 parts by weight of purified water of JP (solution II). Acrylic acid-2-ethylhexyl acrylate copolymer (acrylic acid content 70%) was prepared, and 5 parts by weight of this copolymer was dissolved in 50 parts by weight of methanol (solution
III). The above solutions I, II and III and 100 parts by weight of polyethylene glycol 600 (manufactured by Wako Pure Chemical Industries, Ltd., special grade) were uniformly mixed to obtain a colorless and transparent adhesive solution.

(B) Preparation of pressure-sensitive adhesive sheet and performance evaluation of pressure-sensitive adhesive force: The pressure-sensitive adhesive solution obtained in the section of this Example (A) was used in Example 1
An adhesive sheet was prepared in the same manner as in the item (B), and the adhesive strength was evaluated. The results were similar to those in Example 1 (B). However, the adhesive force substitute characteristic value (holding force) is 20 minutes or more, and the adhesive force substitute characteristic value (180 ° fold back peeling method)
Was over 500 g / 15 mm.

(C) Evaluation of Conductivity of Adhesive Layer: Using the adhesive solution obtained in the section of this Example (A), Example 1
The impedance was measured by the same method as in the item (C). The impedance of the test piece was 348Ω.

Example 21 (A) Preparation of adhesive solution: vinylpyrrolidone-acrylic acid copolymer (molar ratio: 90: 1
0) was prepared, and 80 parts by weight of this copolymer was uniformly dissolved in 200 parts by weight of methanol (solution I). 5 parts by weight of KCL was dissolved in 50 parts by weight of purified water of JP (solution II). An acrylic acid-butyl acrylate copolymer (acrylic acid content 30%) was prepared, and 20 parts by weight of this copolymer was dissolved in 50 parts by weight of methanol (solution III). The above solutions I, II, and III and 200 parts by weight of polyethylene glycol 600 (manufactured by Wako Pure Chemical Industries, Ltd., special grade) were uniformly mixed to obtain a colorless and transparent adhesive solution.

(B) Preparation of pressure-sensitive adhesive sheet and performance evaluation of pressure-sensitive adhesive force: The pressure-sensitive adhesive solution obtained in the section of this Example (A) was used in Example 1
An adhesive sheet was prepared in the same manner as in the item (B), and the adhesive strength was evaluated. The results were similar to those in Example 1 (B). However, the adhesive force substitute characteristic value (holding force) is 40 minutes or more, and the adhesive force substitute characteristic value (180 ° folding peeling method)
Was 750 g / 15 mm or more.

(C) Evaluation of Conductivity of Adhesive Layer: Using the adhesive solution obtained in the section of this Example (A), Example 1
The impedance was measured by the same method as in the item (C). The impedance of the test piece was 306Ω.

(Effects of the Invention) According to the present invention, a conductive pressure-sensitive adhesive having such excellent conductivity and adhesiveness can be obtained. The skin electrode using this conductive adhesive can be easily attached to the skin surface and does not require auxiliary means for fixing. Since this conductive adhesive does not need to contain water, there is no change in conductivity and adhesiveness due to water evaporation during use or storage of the electrode, and therefore does not affect electrical performance. . Moreover, since a special packaging for preventing evaporation of water is not required, the conductive adhesive can be provided at low cost. Furthermore, since no metal powder is contained, electrical noise is hardly mixed in. In addition, since the adhesive does not contain natural polymer materials, microorganisms do not propagate during storage,
They do not cause offensive odor or skin irritation. Since the main constituent monomer of the conductive adhesive polymer is vinylpyrrolidone, which is also a product listed in the Japanese Pharmacopoeia, it is highly safe against living organisms.

Moreover, since 5 mol% to 90 mol% of (meth) acrylic acid (salt) is contained as a copolymerization component of the copolymer, and the copolymer is contained in the blend polymer in an amount of 1 wt% to 30 wt%,
The internal cohesive force of the conductive pressure-sensitive adhesive can be increased, a thick film pressure-sensitive adhesive layer can be formed, and a reinforcing material such as a nonwoven fabric for increasing the cohesive force is not particularly required. Also,
So-called adhesive cracking phenomenon and adhesive residue phenomenon do not occur. Such a conductive adhesive can be easily and usefully utilized in various medical devices.

Claims (1)

[Claims] 1. A vinylpyrrolidone (co) polymer and (meth)
A medical conductive adhesive containing a blend polymer of acrylic acid (salt)-(meth) acrylic acid alkyl ester copolymer, an electrolyte and a softening agent, wherein the (meth) acrylic acid (salt)-(meth ) The alkyl acrylate copolymer contains (meth) acrylic acid (salt) as a copolymer component in an amount of 5 to 90 mol%, and the (meth) acrylic acid (salt) -alkyl (meth) acrylate is 1% by weight of the ester copolymer in the blend polymer
Medical conductive adhesive containing up to 30% by weight.