JP2822221B2 - Adhesive waterproofing sheet for affected area - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pressure-sensitive adhesive waterproof sheet for an affected part, which can sufficiently prevent water from entering the affected part at the time of bathing or the like.

[Prior art] Conventionally, in the case of having a wound and taking a bath, if the wound is of such a degree that it does not interfere with wetting, protect the wound with an emergency bandage for hygiene protection. It is common to take a bath. However, in this case, since the first-aid bandage has minute holes for maintaining air permeability, water is flooded from there. As a result, the trauma is stimulated to cause pain, causing pain to the patient and sometimes causing bacterial contamination due to water immersion. In addition, after the bathing, it is necessary to replace the plaster which has been flooded, which is uneconomical. In addition, the replacement of the plaster damages the affected area and prolongs the treatment of trauma. There is a similar problem when performing water work other than bathing.

In addition, similar to this rescue bandage, a pelvic wound with good releasability to protect the trauma with a coated cloth to the extent that it does not block the texture with a resin that forms a water-repellent or hydrophobic film An application patch has been proposed (JP-A-64-11546). In this dressing for wounds, those useful as a resin for forming a water-repellent or hydrophobic film are generally soft and have rubber elasticity and give a soft feel to wounds, and natural rubber, Synthetic resins are preferred, and silicone rubber is particularly preferred. Based on rubber-like silicone resin composed of dimethylpolysiloxane containing 0.8 mol% of vinylmethylsiloxane units, oil composed of hydrogen methylpolysiloxane and chloroplatinic acid An example is shown in which a mixture comprising the platinum catalyst thus prepared is applied to gauze and heated to form a film. However, since the texture of this dressing for wounds is not closed, if it leaks into water, it is immediately flooded.

[Problems to be solved by the invention]

It is necessary to prevent the wound from getting wet with water in order to prevent the wound from being irritated or bacteria from entering when taking a bath, for example. Is the most preferable. In addition, not only the trauma but also the affected part such as the inflamed part has the same problem in treatment.

Then, in order to prevent the affected part from being wet with water, it seems that a sheet-like body having a hydrophobic coating on the front surface and an adhesive layer on the back surface may be covered, for example, from a gauze-applied wound. As can be readily seen when attempting with a cloth packing tape, water quickly penetrates through very small gaps in the adhesive layer. This is because the surface of the body has a complicated shape, the shape of the sheet does not conform to it, and the adhesive does not only have a weak adhesive force, but it is generally made of a hydrophobic material and The reason for this is that the adhesive force is significantly reduced, and that the adhesive is peeled off due to a force applied to the adhesive layer by human motion.

It is not enough to make the adhesive strong because that is the case, and the waterproofing sheet for the affected area must be peeled off after necessary such as bathing, so the adhesive is strong It is difficult to peel off, and the action of the force at the time of peeling may adversely affect the affected part. Further, even if the adhesive has both of these properties, there still remains a problem that water enters through a gap between the skin and the adhesive layer.

An object of the present invention is to provide a pressure-sensitive adhesive waterproof sheet for an affected part which has sufficient adhesive strength, can prevent water intrusion, and can be easily peeled off.

[Means for solving the problem]

The present inventor has conducted various studies on the problem of water intrusion from the gap between the skin and the adhesive layer, and one of the causes is unevenness on the surface of the skin. This is due to the fact that there is a fairly clear, uneven texture based on skin tissue, as well as pores, etc., but the waterproofing sheet for the affected area that adheres to this has a thin adhesive layer on a flat surface cloth. Since the adhesive layer has the adhesive layer, the adhesive layer adheres to the convex portion of the skin, but does not adhere to the convex portion, so that water penetrates along the concave portion.

Then, when the adhesive which can adhere | attach to the recessed part of skin was examined, it discovered that the gel-like tacky and hydrophobic hardened film could satisfy the conditions well, and reached this invention.

That is, the present invention is a pressure-sensitive adhesive waterproof sheet for an affected part obtained by forming a gel-like adhesive and hydrophobic cured film on a substrate.

The cured film formed on the substrate in the present invention must be continuous and have no pores through which water enters the surface, and since it is itself hydrophobic, it is waterproof. And sex. The cured film acts as an adhesive because it has tackiness, so that the waterproof sheet can be adhered to the skin or the like on the front surface, and because it is a gel as described above, it is soft and has fine skin. It is easily deformed according to the shape and adheres well to the concave portion of the skin to prevent water from entering.

The cured film is preferably formed on one surface of a substrate.

In using the pressure-sensitive adhesive waterproof sheet for an affected area of the present invention, for example, a wound is covered with gauze or an emergency bandage, then covered with the waterproof sheet, and the periphery of the waterproof sheet is adhered to the skin in close contact. When using gauze, it is common to pre-fix gauze to the center of the tarpaulin.

Further, in order to prevent the waterproof sheet from adhering to the gauze or the bandage, a thin paper or the like may be interposed between the waterproof sheet and the gauze when covering. Further, the adhesive waterproof sheet for the affected part of the present invention may be provided with a non-adhesive coating layer on the part facing the affected part, but it has versatility such that it is cut out and used according to the size of the affected part. When using it, it is better to use the former. With this configuration, gauze or the like is not removed when the submerged sheet is peeled off, and the affected part is not affected.

As the material of the cured film constituting the adhesive waterproof sheet for affected areas of the present invention, synthetic rubber and various resins can be used as long as they provide a gel-like adhesive and hydrophobic film after curing. It is desirable to have sufficient softness in order to make it adhere well to the surface. The softness of the cured film can be measured by a measure such as penetration. It is required that the cured film is sufficiently soft and adheres well to the skin, and that no fine gap such as water passes through the skin is formed. In this respect, the material of the cured film is silicone (organopolysiloxane). Is the most suitable. Further, silicone has excellent heat resistance, weather resistance, and chemical resistance, and has properties suitable for the intended use of the waterproof sheet of the present invention, such as being inert to the human body.

In the present invention, when using a silicone gel as the gel-like cured film, a composition that is generally used as a silicone gel can be used as the composition, and if it is an addition-curable silicone gel, for example, (A) The average number of vinyl groups bonded to silicon atoms in one molecule
0.1 to 2.0 organic compounds in which the remaining organic group bonded to the silicon atom is a substituted or unsubstituted monovalent hydrocarbon group containing no aliphatic unsaturation and having a viscosity at 25 ° C of 50 to 100,000 cp. (B) an organopolyhydrodienesiloxane in which the number of hydrogen atoms bonded to silicon atoms exceeds 2 on average per molecule, wherein the number of hydrogen atoms bonded to silicon atoms is (A) (C) a catalyst selected from the group consisting of a platinum-based catalyst, a palladium-based catalyst and a rhodium-based catalyst, wherein (A) and (B) ) And the amount of the catalytic metal element is 0.1
A gel-curable organopolysiloxane composition comprising an amount of about 300 ppm is preferably used.

Here, in the organopolysiloxane of the component (A), a vinyl group bonded to a silicon atom has an average of 0.1 in one molecule.
It has 1 to 2.0, preferably 0.1 to 1.4. If the amount of the vinyl group is less than 0.1, the amount of organopolysiloxane that does not contribute to crosslinking increases, and the physical properties of the cured gel and the base material (cotton, parafilm, chemical fiber) Significantly lowers the tackiness of the film.

(A) Among the organic groups bonded to the silicon atoms of the organopolysiloxane, those other than the above-mentioned vinyl groups include methyl, ethyl, propyl, butyl, hexyl, octyl, decyl, and dodecyl groups. An alkyl group such as a phenyl group, an aralkyl group such as a β-phenylethyl group, a β-phenylpropyl group, and a chloromethyl group, a cyanoethyl group, and a 3,3,3-trifluoropropyl group. Such a substituted hydrocarbon group is exemplified, but a methyl group is desirable from the viewpoint of easy synthesis, easy handling in an uncured state, and heat resistance and physical properties of the gel. Its viscosity is 50-1000 at 25 ° C
00 cp, preferably in the range of 30 to 5000 cp. If the viscosity is lower than 50 cp, it is easy to flow, and the physical properties after the reaction are poor. On the other hand, if it exceeds 100,000 cp, the workability will deteriorate.

The siloxane skeleton of the organopolysiloxane (A) may be linear or branched, or may be a mixture of both. However, the siloxane skeleton is substantially synthesized from the viewpoint of ease of synthesis and imparting moderate softness to the gel. It is preferably linear. A small amount of cyclic organopolysiloxane may coexist, but even if it has a vinyl group bonded to a silicon atom, it has low reactivity and does not contribute to the formation of a sticky gel. The vinyl group in the organopolysiloxane may be bonded to either a silicon atom in the middle of the molecule or a silicon atom at the terminal, but is bonded to the silicon atom at the terminal due to a reaction rate or a gel forming effect by the reaction. Is preferred.

The organopolysiloxane of the component (B) reacts with a vinyl group of the organopolysiloxane of the component (A) to form a gel-like substance, and two or more of the components (A) bonded to a silicon atom. To react with organopolysiloxanes containing vinyl groups to form a loose network,
In one molecule, there must be more than two hydrogen atoms bonded to silicon atoms on average.

Such a hydrogen atom may be bound to any silicon atom at the terminal of the molecule or in the middle of the molecule. Examples of the organic group bonded to the silicon atom of (B) include the same organic groups other than the vinyl group among the organic groups bonded to the silicon atom of (A). Therefore, a methyl group is preferable. Although the cyclosan skeleton may be linear or branched, it is easy to synthesize and the resulting gel gives good physical properties.
Linear is preferred. The clay of the component (B) is not particularly limited, but is preferably 10 to 1000 from the viewpoint of workability and ease of synthesis.
A range of 0 cp is preferred.

The amount of component (B) is from 1 to 5, preferably from 1.0 to 5, hydrogen atoms bonded to silicon atoms in component (B) per one vinyl group bonded to silicon atoms in component (A). 1.5
It is a quantity that is individual. If the amount of hydrogen atoms bonded to silicon atoms is less than 1, crosslinking does not proceed sufficiently and the gel becomes too soft. Further, even if the amount of the hydrogen atoms exceeds 5, the gel becomes hard with time.

The catalyst of the component (C) used in the present invention is for promoting the addition reaction between the vinyl group of the component (A) and the hydroxyl group of the component (B). Acids, complexes of platinum and olefins, complexes of platinum and ketones, platinum-based catalysts exemplified by a chain of platinum and vinylsiloxane, tetrakis (triphenylphosphine) palladium, palladium black and triphenylphosphine A palladium-based catalyst or a rhodium-based catalyst exemplified by a mixture or the like can be used, but a platinum-based catalyst is preferable because of its catalytic effect and easy handling.

The amount of the component (C) is such that the amount of the catalytic metal element is in the range of 0.01 to 300 ppm based on the total amount of the components (A) and (B). If it is less than 0.01 ppm, the addition reaction does not proceed sufficiently and the gel-like substance becomes too soft. The component (C) is also called a curing accelerator.

Examples of such a gel-curable organopolysiloxane composition include silicone gels KE-61051A and KE-61051A.
A mixed gel composition obtained by adding a curing accelerator X-93-405 to 1051B, or a mixed gel composition of X-32-870 and CX-32-870 (all manufactured by Shin-Etsu Chemical Co., Ltd.) and the like can be mentioned.

The gel-curable organopolysiloxane composition described above may be stored in a single container by using a platinum-based catalyst having low activity at room temperature in the presence of a reaction inhibitor such as an acetylene-based compound, Further, for example, (A) and (B) are the same container, (C) is a separate container, or a part of (A) and (B), and a combination of most of (A) and (C) are separate containers. It may be stored in a container, mixed uniformly immediately before curing, and defoamed under reduced pressure before use. In addition, an inorganic filler may be added to the composition as needed to adjust workability, hardness after curing, mechanical strength, and the like according to the application. Examples of such an inorganic filler include fumed silica, silica aerogel, and precipitated silica. Solvents such as toluene and hexane; viscosity modifiers such as dimethylpolysiloxane; additional base polymers such as alkenyl-containing polysiloxanes; and curing control agents such as acetylene alcohol and reaction products thereof. You can use them together.

The adhesive waterproof sheet of the present invention can be obtained by stretching and curing (cross-linking) the above-mentioned gel-like curable composition onto a cloth, a nonwoven fabric, or the like described below. The temperature at the time of curing is not particularly limited, but it takes time to cure at a low temperature, and at a high temperature, the film is cured while bubbles are mixed in the film, so that the film is cured after defoaming under reduced pressure or
It is desirable to cure at 40 to 50 ° C.

The gel-like adhesive and hydrophobic cured film formed on the base material preferably has a certain thickness to maintain sufficient softness.

The base material constituting the pressure-sensitive adhesive waterproof sheet of the present invention covers the gauze or the emergency bandage covering the affected part by supporting the above-mentioned gel-like pressure-sensitive adhesive, hydrophobic cured film, and to adhere to the skin. Although specifically, there are cloth, film, and the like. The types of cloth include woven cloth and nonwoven cloth. As the material of the cloth, chemical fibers (eg, cellulose acetate), plastic fibers, cotton, and the like can be used. Is preferred. In addition, from the viewpoint of convenience of use of the pressure-sensitive adhesive waterproof sheet of the present invention, an extensible cloth is preferable in consideration of covering and peeling operation of an affected part. Gauze-like woven fabric that has been subjected to shrink processing is also suitable. As the film, for example, parafilm is used.

Since the adhesive waterproof sheet of the present invention is used by protecting the affected area with gauze or an emergency bandage and then attaching it to the area, when using the waterproof sheet according to the size of the wound area, Although it is cut, it is desirable that the size is large enough to cover the gauze and the bandage.

In addition, the waterproof sheet has a skin thickness of 0.2 to 1 mm, from the viewpoint of conformability to the skin, flexibility, adhesion to the skin, waterproofness, or adhesion between the gel-like cured coating layer and the cloth. Especially 0.4 ~
It is preferable that the thickness of the gel-like cured coating layer is 0.7 mm, which is sufficient to form a continuous layer, for example, 0.5 to 2.5 mm, particularly 1 to 2 mm.

On the other hand, the present waterproof sheet must be easily peeled since it must be peeled after its use. It is sufficient that the material of the gel-like cured film itself is easily peelable. However, since it has reciprocity with the required adhesiveness, a means for separately giving a peeling property such as using a peeling material is usually employed. As the release material, those used for conventional adhesive materials cannot be used and have no release effect. It is desirable to use a release material in which a material coated with a surfactant or a material having an uneven surface and having less contact with the adhesive is attached to the adhesive surface. The material of the cured film is such that when ethanol or water adheres to the adhesive surface, the adhesiveness to the skin (a property closer to "stickiness") is reduced. It may be convenient to immerse the in an ethanol solution (around 70%).

〔Example〕

Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to only these Examples.

Example 1 Formulation Silicone gel KE-1051-A (dimethylpolysiloxane silicone gel) 97 parts Silicone gel KE-1051-B (dimethylpolysiloxane silicone gel) 100 parts Curing accelerator X93-405 (all Shin-Etsu Chemical Co., Ltd.) Curing temperature 50 ° C Curing time 25-30 minutes Container (12 × 12) coated with surfactant in advance
× 3 cm), 15 g of the above formulation was put into a 1.5 mm-thick sheet, stored at 50 ° C or lower, and after 2-3 minutes, a cloth of 12 × 12 cm synthetic fiber was spread on the bottom of the container. So that no voids are formed on the silicone. It was allowed to stand horizontally for about 30 minutes to obtain the desired adhesive waterproof sheet.

3cm in hand to check the waterproof effect of this tarpaulin
We placed the absorbent paper on all sides. Then, the waterproof sheet was covered with a piece cut into 8 cm square from above, and was tightly adhered to the back of the hand, and the back of the hand was immersed in warm water for 15 minutes. Thereafter, when the waterproof sheet was peeled off and the adhesion of water to the water-absorbing paper was examined, no wetting by water was recognized, and the waterproof sheet sufficiently exhibited the intended waterproofing action.

Furthermore, as a result of repeating the same waterproof test,
The same adhesiveness to skin and waterproofing effect as in the initial one were observed.

Example 2 Formulation Silicone gel X-32-870 (dimethylpolysiloxane-based silicone gel) 100 parts Silicone gel CX-32-870 (dimethylpolysiloxane-based silicone gel) 0.5 parts (all manufactured by Shin-Etsu Chemical Co., Ltd.) A curing accelerator was also added to the formulation.

Curing temperature 50 ° C Curing time 25 to 30 minutes Container (12 × 12
× 3 cm), 15 g of the above formulation was put into a sheet having a thickness of 1.5 mm, stored at 50 ° C. or lower, and after 2 to 3 minutes, a chemical fiber cloth having a size of 12 × 12 cm was spread on the bottom of the container. Attach so that no voids are formed on the silicone. It was allowed to stand horizontally for about 30 minutes to obtain the desired adhesive waterproof sheet.

In order to confirm the waterproof effect of this waterproof sheet, a 3 cm square absorbent paper was placed on the back of the hand. Then, it was covered with the waterproof sheet (cut into 8 cm square) from above, and was tightly adhered to the back of the hand, and the back of the hand was immersed in warm water for 15 minutes. Thereafter, when the waterproof sheet was peeled off and the adhesion of water to the water-absorbing paper was examined, no wetting by water was recognized, and the waterproof sheet sufficiently exhibited the intended waterproofing action.

Furthermore, as a result of repeating the same waterproof test,
The same adhesiveness to skin and waterproofing effect as in the initial one were observed.

〔The invention's effect〕

The adhesive waterproofing sheet of the present invention protects the affected area with gauze or first aid bandage, and then is used by sticking it on and sticking to the skin, thereby preventing infiltration into the gauze or first aid bandage, such as a wound. Not only can the occurrence of pain in the affected area be prevented, but also the affected area can be spread and bacteria can be prevented from entering. In addition, it is not necessary to replace gauze or an emergency bandage after taking a bath, and it is economical without damaging the affected part.

Furthermore, since this waterproof sheet has excellent adhesiveness to the skin and the gap between the adhesive part and the skin is very small, it completely prevents water infiltration. No pain.

In particular, when the present invention has a cured film formed by curing the above-mentioned organopolysiloxane composition, the above-mentioned effects are particularly remarkable.

In addition, the adhesive waterproof sheet of the present invention having the above-mentioned cured film can be used repeatedly without deteriorating its adhesiveness to the skin even when reused, and dust adheres to the cured film surface. Even it can be easily removed with detergent.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tetsuya Mayuzumi 2-6-1 Otemachi, Chiyoda-ku, Tokyo Shin-Etsu Chemical Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) A61F 13 / 00

Claims (3)

(57) [Claims] An adhesive waterproof sheet for an affected area, comprising a gel-like adhesive and hydrophobic cured film formed on a substrate. 2. The method according to claim 1, wherein the gel-like tacky hydrophobic cured film is
The adhesive waterproof sheet for an affected part according to claim 1, wherein the adhesive waterproof sheet is made of an organopolysiloxane having a viscosity at 25 ° C of 50 to 10,000 cp. 3. The gel-like sticky hydrophobic cured film comprises: (A) a vinyl group bonded to a silicon atom in an average of one molecule;
0.1 to 2.0 organic compounds in which the remaining organic group bonded to the silicon atom is a substituted or unsubstituted monovalent hydrocarbon group containing no aliphatic unsaturation and having a viscosity at 25 ° C of 50 to 100,000 cp. (B) an organopolyhydrodienesiloxane in which the number of hydrogen atoms bonded to silicon atoms exceeds 2 on average per molecule, wherein the number of hydrogen atoms bonded to silicon atoms is (A) (C) a catalyst selected from the group consisting of platinum-based catalysts, palladium-based catalysts and rhodium-based catalysts, wherein (A) and (B) ) And the amount of the catalytic metal element is 0.1
The adhesive waterproof sheet for an affected part according to claim 1, wherein the organopolysiloxane composition is cured by an amount of up to 300 ppm.