JP2000328025A - Stretchable adhesive tape and sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stretchable adhesive tape or sheet used in medical- sanitary areas, sports areas, cosmetic areas, etc., which sufficiently follows the movement of the skin surface and provides little irritation to the skin. SOLUTION: An adhesive tape or sheet is prepared by forming an adhesive layer on one or both sides of a stretchable nonwoven fabric substrate wherein a stretch yarn is combined with a nonwoven fabric having a basis weight of 30 to 250 g/m2. Here, the stretchable nonwoven fabric substrate has a tensile strength at 40%-stretching of 0.5 kgf/10 mm or smaller and a tensile strength at break of 1.5 kgf/10 mm or larger. Preferably, the stretch yarn is intertwined with the nonwoven fabric, and the change of the elongation percentage when the tensile pull is changed to 0.5 to 1.5 kgf/10 mm, is 15% or larger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretchable pressure-sensitive adhesive tape or sheet which can be used in the medical field, sports field, beauty field, etc., and more specifically for medical uses, sports uses, manipulative uses, body reinforcement / compensation uses, etc. The present invention relates to an elastic pressure-sensitive adhesive tape or sheet that is used by sticking to the skin for use.

[0002]

2. Description of the Related Art Conventionally, as an adhesive tape or sheet (hereinafter sometimes referred to as an adhesive tape) for sticking to the skin used in the above technical field, a strong twist made of an elastic fabric or a twisted yarn obtained by weaving an elastic yarn into a cotton fabric. Fabrics, films and nonwoven fabrics made of polyurethane resin or polyolefin resin are used.

[0003] Usually, a fabric using the above-mentioned woven fabric has a low stress in a low modulus region and has an appropriate strength, but has insufficient elongation, and generally has an elongation of only about 50%. Many do not. Further, when a woven fabric is used as the base material of the pressure-sensitive adhesive tapes, there is a problem that fraying is apt to occur from the cut end face, and the handling property and the mounting property are not sufficient.

[0004] On the other hand, a film using a polyurethane resin or a polyolefin resin has sufficiently satisfactory characteristics in terms of extensibility, but generally has a small film thickness, and therefore has a problem in mechanical strength and handleability during sticking operation. There is a drawback in the point.

[0005] Further, there has been developed a nonwoven fabric made of an extensible material such as polyurethane or polyolefin. However, although the nonwoven fabric is satisfactory in elongation and handleability, it is improved in mechanical strength. It has room.

In general, the surface of the skin, to which the adhesive tape is applied, is not flat, has a certain degree of elasticity, and bends greatly at joints and the like. A characteristic that can follow the movement is required. In addition, when the adhesive tapes follow the movement of the skin surface, if an adhesive or a base material having a skin adhesive force that restricts the movement of the skin is used, it may cause skin irritation to the application site and cause rash, etc. Gives a sense of discomfort and discomfort.

Therefore, the pressure-sensitive adhesive tapes to be applied to the application site need to have excellent elasticity so as to follow the movement of the skin surface, and not to restrict the skin surface when following the movement of the skin. It is desired to use a substrate that easily expands and contracts even with a small stress, that is, a substrate that has a small stress in a low modulus region. It is needless to say that the handleability and the mechanical strength during the sticking operation must be satisfactory.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and is intended to impart elasticity to the excellent handleability and mechanical strength of a nonwoven fabric. By combining a stretchable yarn with a nonwoven fabric having a specific basis weight and using a stretchable nonwoven fabric base material set to a specific strength as a base material for adhesive tapes, it sufficiently follows the movement of the skin surface, and It has been found that an adhesive tape or sheet that does not give skin irritation can be obtained, and the present invention has been completed.

[0009]

That is, the present invention relates to a method for producing a paper having a basis weight of 30.
A pressure-sensitive adhesive tape or sheet in which a pressure-sensitive adhesive layer is formed on one or both sides of a stretchable nonwoven fabric substrate obtained by combining a stretchable yarn with a nonwoven fabric of up to 250 g / m ^{2, wherein} the stretchable nonwoven fabric substrate is 40% The tensile strength during elongation is 0.5 kgf /
10 mm or less and tensile breaking strength of 1.5 kgf / 1
It is intended to provide an elastic pressure-sensitive adhesive tape or sheet having a length of 0 mm or more.

[0010] In particular, the stretch yarn composited with the nonwoven fabric is
The present invention is preferably knitted in a nonwoven fabric, and is adjusted so that the elongation change when the tensile load is changed to 0.5 to 1.5 kgf / 10 mm is 15% or more. It is preferable because the effect can be maximized.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The stretchable pressure-sensitive adhesive tape or sheet of the present invention is obtained by forming a pressure-sensitive adhesive layer on one or both sides of a stretchable nonwoven fabric substrate. As the stretchable nonwoven fabric substrate used in the present invention, a nonwoven fabric having a basis weight of 30 to 250 g / m ² , preferably 50 to 200 g / m ² is used. If the basis weight is less than 30 g / m ² , practically sufficient mechanical strength cannot be obtained, which is undesirable.
When the basis weight exceeds / m ² , practical strength can be ensured, but the bulk becomes bulky, causing difficulty in handling, and the cost tends to increase economically, which is not desirable. In addition,
In the present invention, it is important to use a non-woven fabric, and in the case of a cloth such as a woven cloth, the cut end face is frayed or the rigidity is too high to exhibit sufficient elasticity, so that a desired effect cannot be exhibited.

Further, as the non-woven fabric material constituting the above-mentioned stretchable base material, a natural material or a synthetic material can be used without limitation, and specifically, a single material such as cotton, rayon, acetate, polyester, polypropylene, polyethylene and the like can be used. Fibers or blended fibers can be used. Among these, it is preferable to use polyester or polypropylene from the viewpoint of heat resistance, workability, economy and the like.

The stretchable nonwoven fabric substrate used for the pressure-sensitive adhesive tape or sheet of the present invention is characterized in that stretchable yarn is compounded with the above-mentioned nonwoven fabric. The material of the stretch yarn to be composited is not limited as long as it has sufficient elasticity and stretchability.However, from the viewpoint of processability and stretch characteristics, it is preferable to use a polyurethane resin or a polyether-based resin. preferable. Also, the thickness of such elastic yarn is
It is preferable to use a resin having a denier of about 30 to 200 denier, preferably about 40 to 160 denier from the viewpoint of adjusting the tensile strength described later. The stretch yarn can be knitted in the MD direction and / or TD direction of the nonwoven fabric, thermocompression-bonded, or composited by using an adhesive. It is preferable to knit it into a nonwoven fabric to obtain a stretchable nonwoven fabric substrate.

The stretchable nonwoven fabric substrate in the present invention comprises:
In order to reduce the stress in the low modulus region from the viewpoint of reducing skin irritation, the tensile strength at 40% elongation is 0.5 kgf / 10 mm or less, preferably 0.3 kgf.
/ 10 mm or less, and the tensile breaking strength is 1.5 kgf /
It is important to adjust so as to be 10 mm or more, preferably 2 kgf / 10 mm or more. If the tensile strength exceeds 0.5 kgf / 10 mm, the movement of the skin surface is restricted when the pressure-sensitive adhesive tape or sheet of the present invention follows the movement of the skin surface at the sticking site and stretches. May cause skin irritation when affixed. Also,
If the tensile strength at break is less than 1.5 kgf / 10 mm, the mechanical strength is insufficient, and the adhesive tape may break, causing a problem in fixability.

The stretchable pressure-sensitive adhesive tape or sheet of the present invention is obtained by forming a pressure-sensitive adhesive layer on the stretchable nonwoven fabric substrate described above. As the pressure-sensitive adhesive to be formed, those known as medical pressure-sensitive adhesives having little skin irritation, such as natural rubber-based, synthetic rubber-based, acrylic-based, silicone-based, and vinyl ether-based adhesives can be used.

The method for forming the pressure-sensitive adhesive layer on the stretchable nonwoven fabric substrate is not particularly limited, but a method in which a pressure-sensitive adhesive solution is directly applied to one or both sides of the stretchable nonwoven fabric substrate and dried (direct printing method); A method of forming an adhesive layer in advance and transferring it to one or both sides of the stretchable nonwoven fabric substrate (transfer method), or applying a primer treatment or a corona discharge treatment to the surface of the stretchable nonwoven fabric substrate The pressure-sensitive adhesive layer can be formed indirectly. The thickness of the formed pressure-sensitive adhesive layer is 20 to 1
It is preferable to set the thickness to about 00 μm, preferably about 30 to 90 μm, from the viewpoint of appropriate skin adhesion.

Furthermore, the exposed surface of the formed pressure-sensitive adhesive layer can be covered and laminated with a separator that has been subjected to a single-sided release treatment, and can be wound into a sheet or a roll. In addition, even if a separator is not laminated | stacked, a peeling process may be performed to the back surface of a stretchable nonwoven fabric base material, and what is called a self-back surface peeling process may be performed and a long tape or sheet | seat may be wound in a roll shape.

The stretchable pressure-sensitive adhesive tape or sheet of the present invention has the above-mentioned constitution, but when used for applications requiring waterproofness, a waterproof function is provided on the back surface of the stretchable nonwoven fabric substrate. Resin that has air permeability but moderate water repellency (waterproofness) such as porous film of polyolefin film, polyurethane film, polyethylene film, polypropylene film, polyamide film, polyester film, etc. Films can also be laminated. The thickness of the film to be laminated at this time is 1 to 50 μm, which is 3 from the viewpoint of economy and reliable waterproof function.
It is preferable to set it to about 20 μm. In addition, even if such a resin film is not laminated, the waterproof property can be simply given by applying a silicone resin, a fluorine resin, paraffin, or the like.

Further, when the tensile load is changed from 0.5 kgf / 10 mm to 1.5 kgf / 10 mm, the stretchable adhesive tape or sheet of the present invention has an elongation of 15% or more, preferably 20% or more. It is preferable to adjust so that In other words, in the product of the present invention, even if a stress change occurs in such a small load area, the elongation rate changes greatly. And suppress the expression of skin irritation.

In the present invention, a liquid-absorbent pad can be placed on the surface of the central part of the pressure-sensitive adhesive layer formed on the surface of the stretchable nonwoven fabric substrate. As the material of the liquid-absorbent pad, cotton, rayon, rayon acrylic fiber, cellulose rayon, rayon polyester, polyurethane non-woven fabric and the like used in so-called emergency bandages can be used. You can choose.

In the above-mentioned elastic pressure-sensitive adhesive tape or sheet, the surface of the liquid-absorbent pad and the exposed pressure-sensitive adhesive layer are covered and protected until the elastic pressure-sensitive adhesive tape or sheet is used so as to cover and protect the surface. It is preferable to cover and temporarily attach a separator which has been subjected to a release treatment such as silicone treatment or fluorine treatment. Furthermore, when used for medical applications, it is preferable to perform sterilization treatment such as ethylene oxide gas (EOG) sterilization, γ-ray sterilization, and electron beam sterilization.

[0022]

As described above, since the stretchable pressure-sensitive adhesive tape or sheet of the present invention has a property of greatly expanding with a small stress as compared with a stretchable substrate conventionally used, the skin irritating property can be improved. Since a non-woven fabric is used instead of a woven fabric, the effect is high, the cut end face is not frayed, and the handleability during the sticking operation is excellent.

As described above, since the stretchable pressure-sensitive adhesive tape or sheet of the present invention is obtained by compounding a stretchable yarn with a specific nonwoven fabric, it has stretchability in accordance with the movement of the skin,
It has little skin irritation. Therefore, in medical applications, as adhesive tapes for fixing gauze, catheters, etc., and for pressing moderately, in sports and manipulative applications, as tapes used for fixing, protecting, treating and treating affected parts, In reinforcement / compensation applications, it is useful as a large area adhesive tape as a substitute for a girdle or corset, which can apply a uniform load without impairing the body movement without applying a partial load. Also,
It can temporarily reinforce and correct parts of the body such as face, neck, arms, chest, belly, thighs and calves.

[0024]

EXAMPLES Examples of the present invention will be described below in more detail, but the present invention is not limited thereto, and various applications can be made without departing from the technical concept of the present invention. It is possible. In the following text, “parts” means “parts by weight”, and “%” means “% by weight”.

Example 1 A monomer mixture consisting of 90 parts of 2-ethylhexyl acrylate and 10 parts of 2-hydroxyethyl acrylate was
In ethyl acetate, an acrylic pressure-sensitive adhesive was obtained by copolymerization under an inert gas atmosphere, and this solution was applied to the treated surface of a separator that had been subjected to silicone treatment on one side so that the thickness after drying was 50 μm, It dried at 100 degreeC for 3 minutes, and formed the adhesive layer.

Next, a polyester non-woven fabric (basis weight 89 g / m ² ) and urethane yarn (7
(0 denier) and a non-woven fabric substrate having elasticity in the longitudinal direction, which was sewn, was attached to the elastic adhesive sheet of the present invention.

The tensile strength of the obtained pressure-sensitive adhesive sheet at 40% elongation is 0.1 kgf / 10 mm, the tensile strength at break is 2.7 kgf / 10 mm, and the tensile load is 0.5 kgf / 1.
The change in elongation when changing from 0 mm to 1.5 kgf / 10 mm was 26%.

Example 2 An acrylic polymer 100 obtained by copolymerizing a monomer mixture consisting of 90 parts of 2-ethylhexyl acrylate and 10 parts of 2-hydroxyethyl acrylate in an inert gas atmosphere in ethyl acetate. To 50 parts of sorbitan trioleate, 0.1 of trifunctional isocyanate (Coronate L, manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent
Six parts were mixed in ethyl acetate to prepare an acrylic pressure-sensitive adhesive solution.

The obtained acrylic pressure-sensitive adhesive solution is applied to a treated surface of a separator having one surface subjected to silicone treatment so that the thickness after drying becomes 50 μm, and dried at 100 ° C. for 3 minutes to form a pressure-sensitive adhesive layer. Formed.

Next, the surface of the obtained pressure-sensitive adhesive layer was
STELL nonwoven fabric (basis weight 123g / m ^Two) Urethane yarn
(140 denier) sutured and stretchable in the vertical direction
The stretchable adhesive sheet of the present invention is obtained by laminating a nonwoven fabric substrate.
Was prepared.

The resulting adhesive sheet had a tensile strength at a 40% elongation of 0.1 kgf / 10 mm, a tensile breaking strength of 4.0 kgf / 10 mm, and a tensile load of 0.5 kgf / 1.
The change in elongation when changing from 0 mm to 1.5 kgf / 10 mm was 25%.

Comparative Example 1 The stretchable nonwoven fabric substrate used in Example 1 was applied to a polyester nonwoven fabric (basis weight 55 g / m ² ) by urethane yarn (40 g).
(Denier) was used to prepare a stretchable pressure-sensitive adhesive sheet in the same manner as in Example 1, except that a nonwoven fabric substrate having a stretchability in the longitudinal direction was used.

The tensile strength of the obtained pressure-sensitive adhesive sheet at 40% elongation is 0.6 kgf / 10 mm, the tensile breaking strength is 1.7 kgf / 10 mm, and the tensile load is 0.5 kgf / 1.
The change in elongation when changing from 0 mm to 1.5 kgf / 10 mm was 40%.

Comparative Example 2 The stretchable nonwoven fabric substrate used in Example 1 was coated on a polyester nonwoven fabric (basis weight 60 g / m ² ) with a urethane thread (40 g / m ² ).
(Denier) was used to prepare a stretchable pressure-sensitive adhesive sheet in the same manner as in Example 1, except that a nonwoven fabric substrate having a stretchability in the longitudinal direction was used.

The obtained pressure-sensitive adhesive sheet had a tensile strength of 0.2 kgf / 10 mm at 40% elongation, a tensile breaking strength of 1.0 kgf / 10 mm, and a tensile load of 0.5 kgf / 1.
The change in elongation when changing from 0 mm to 1.5 kgf / 10 mm was 23%.

Comparative Example 3 The stretchable nonwoven fabric substrate used in Example 1 was applied to a polyester nonwoven fabric (basis weight 95 g / m ² ) by urethane yarn (70 g).
(Denier) was used to prepare a stretchable pressure-sensitive adhesive sheet in the same manner as in Example 1, except that a nonwoven fabric substrate having a stretchability in the longitudinal direction was used.

The tensile strength of the obtained pressure-sensitive adhesive sheet at 40% elongation is 0.3 kgf / 10 mm, the tensile strength at break is 2.3 kgf / 10 mm, and the tensile load is 0.5 kgf / 1.
The change in elongation when changing from 0 mm to 1.5 kgf / 10 mm was 12%.

Comparative Example 4 The stretchable nonwoven fabric substrate used in Example 1 was coated on a cotton fabric (basis weight 135 g / m ² ) with a urethane thread (70 denier).
Was prepared in the same manner as in Example 1 except that a woven fabric base material having elasticity in the longitudinal direction was used.

The tensile strength of the obtained pressure-sensitive adhesive sheet at 40% elongation was 1.2 kgf / 10 mm, the tensile breaking strength was 4.1 kgf / 10 mm, and the tensile load was 0.5 kgf / 1.
The change in elongation when changing from 0 mm to 1.5 kgf / 10 mm was 5%.

Comparative Example 5 The stretchable nonwoven fabric substrate used in Example 1 was made of a strong twist made of cotton.
Cloth (basis weight 150g / m ^Two), Except that
A stretchable pressure-sensitive adhesive sheet was produced in the same manner as in Example 1.

The tensile strength of the obtained pressure-sensitive adhesive sheet at 40% elongation was 1.17 kgf / 10 mm, the tensile strength at break was 5.1 kgf / 10 mm, and the tensile load was 0.5 kgf / mm.
The change in elongation when changing from 10 mm to 1.5 kgf / 10 mm was 13%.

Comparative Example 6 The same procedure as in Example 1 was repeated except that the stretchable nonwoven fabric substrate used in Example 1 was a substrate made of a polyurethane film (basis weight 30 g / m ² , 30 μm thick). An adhesive sheet was prepared.

The resulting adhesive sheet had a tensile strength at a 40% elongation of 0.14 kgf / 10 mm, a tensile breaking strength of 1.4 kgf / 10 mm, and a tensile load of 0.5 kgf / mm.
The change in elongation when changing from 10 mm to 1.5 kgf / 10 mm was 300%.

COMPARATIVE EXAMPLE 7 The same procedure as in Example 1 was repeated except that the stretchable nonwoven fabric substrate used in Example 1 was a nonwoven fabric fabric made of a polyurethane nonwoven fabric (basis weight: 82 g / m ² ). A sheet was prepared.

The resulting adhesive sheet had a tensile strength at a 40% elongation of 0.20 kgf / 10 mm, a tensile breaking strength of 0.7 kgf / 10 mm, and a tensile load of 0.5 kgf / mm.
The change in elongation when changing from 10 mm to 1.5 kgf / 10 mm was 300%.

The elastic pressure-sensitive adhesive sheets obtained in each of the above Examples and Comparative Examples were evaluated for fixability on the skin surface, skin irritation, mobility, discomfort, and fraying of the end surfaces by the following methods. Are summarized in Table 1.

<Fixing property of skin surface> The stretchable pressure-sensitive adhesive sheet prepared in each of Examples and Comparative Examples was applied to a 50 mm wide and 2 mm long sheet.
The sheet was cut to 00 mm, the cut end of the sheet was attached to the wrist, the sheet was stretched to the maximum by hand, and the other end was wound to fix the wrist. The fixation function when used for wrist fixation was evaluated according to the following criteria. 〇: The wrist is sufficiently fixed. Δ: There is room for the wrist to move slightly. ×: Cutting occurs when stretched out by hand at the time of sticking.

<Skin irritation> The elastic pressure-sensitive adhesive sheet prepared in each of Examples and Comparative Examples was cut into a width of 19 mm, affixed to a volunteer's forearm, and peeled after 8 hours. The skin irritation was evaluated according to the criteria. 〇: There is slight irritation, or slight irritation. ×: Pain felt painful.

<Movability> The stretchable pressure-sensitive adhesive sheet prepared in each of the examples and comparative examples was applied to a width of 50 mm and a length of 200 mm.
Then, the cut sheet was stretched to the maximum by hand, and this was attached to the stretched elbow of the volunteer. The mobility of the elbow when applied for 8 hours was evaluated according to the following criteria. 〇: There is room for the elbow to move. X: The elbow hardly moves.

<Discomfort> The stretchable pressure-sensitive adhesive sheets prepared in each of the examples and comparative examples were cut into a width of 20 mm and a length of 70 mm, and wound around the second joint of the finger. The sense of incongruity when repeatedly bending and stretching the finger was determined according to the following criteria. 〇: Almost no discomfort. ×: A clear feeling of strangeness is felt.

<Fraying of Edge> The stretchable pressure-sensitive adhesive sheet prepared in each of Examples and Comparative Examples was applied to a width of 5 mm and a length of 70 mm.
And wound around the second joint of the finger. Whether or not the fiber was frayed at the end in the width direction of the sheet was determined according to the following criteria. 〇: No fraying. ×: Fraying has occurred.

[0052]

[Table 1]

Claims (3)

[Claims] A pressure-sensitive adhesive tape or sheet comprising a stretchable nonwoven fabric base material in which a stretchable yarn is composited with a nonwoven fabric having a basis weight of 30 to 250 g / m ² and an adhesive layer formed on one or both surfaces of a stretchable nonwoven fabric substrate. A stretchable pressure-sensitive adhesive tape or sheet, wherein the stretchable nonwoven fabric substrate has a tensile strength at a 40% elongation of 0.5 kgf / 10 mm or less and a tensile breaking strength of 1.5 kgf / 10 mm or more. 2. The stretchable pressure-sensitive adhesive tape or sheet according to claim 1, wherein the stretchable yarn is woven in a nonwoven fabric. 3. A tensile load of 0.5 to 1.5 kgf / 10
The stretchable pressure-sensitive adhesive tape or sheet according to claim 1, wherein a change in elongation when changed to mm is 15% or more.