JPH06166853A - Air-permeable pressure-sensitive adhesive tape or sheet and its production - Google Patents

Abstract

PURPOSE:To obtain an air-permeable adhesive tape or sheet of stable quality efficiently and easily by applying a specified pressure-sensitive adhesive to at least one surface of a lattice-like base material made of a synthetic resin and having openings and drying the adhesive to form vents along the openings on the pressure-sensitive adhesive layer. CONSTITUTION:This adhesive tape or sheet is prepared by applying a pressure- sensitive adhesive diluted with a solvent or water (e.g. aqueous acrylic emulsion pressure-sensitive adhesive) to at least one surface of a lattice-like base material 1 having openings 3, desirably having a void content of 15% or above and the width of an opening of 0.8mm or above and made of a synthetic resin (e.g. PE) on, e.g. a kiss coater, and drying the applied adhesive to form vents 3 along the openings on the adhesive layer 2. Desirably, one surface of the pressure-sensitive layer 2 is laminated with a (non)woven fabric.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a pressure-sensitive adhesive tape having air permeability.

[0002]

2. Description of the Related Art As is well known, in an adhesive tape used for medical purposes, air permeability is required as an essential function in order to prevent stuffiness and fogging.

As a method for producing such a pressure-sensitive adhesive tape having air permeability, a method of applying a pressure-sensitive adhesive to a nonwoven fabric and then drying it to make it porous (for example, Japanese Patent Publication No. 51-1085).
No. 4), those which are made porous by foaming an adhesive (for example, Japanese Patent Publication No. 62-14197), those which are made porous by pressure suction (for example, Japanese Patent Publication No. 57-3265).
There are many reports, such as those which are made porous by a coating method (for example, Japanese Patent Publication No. 61-22855). However, these methods have problems that the mechanical strength of the base material is lowered and the manufacturing conditions are not stable.

Further, after using a base material in which a yarn having a thickness of 50 to 150 denier and a bundle of fine fibers of 50 to 150 g / m ² being knitted is used and an adhesive is applied to one surface thereof, , A method in which a gas is blown onto the surface of the pressure-sensitive adhesive at a high speed to open pores has been reported (JP-A-62-62).
53651).

[0005]

However, the method described in Japanese Patent Laid-Open No. 62-53651 is still insufficient. That is, it is difficult to control the diameter of the air-permeable holes to a desired size because high-speed air is blown to open the holes in the pressure-sensitive adhesive layer coating.

The present invention has been made in view of the above problems, is easy to manufacture and is efficient, and is a breathable pressure-sensitive adhesive capable of stably obtaining a desired vent hole diameter. (EN) A method for manufacturing a tape and supplying a breathable pressure-sensitive adhesive tape having a desired breathable hole and capable of sufficiently retaining an adhesive force.

[0007]

The present invention has been made as a result of extensive studies as a method for solving the above problems. That is, the first aspect of the present invention is to apply the adhesive diluted with a solvent or water to one or both sides of a lattice-shaped substrate having openings made of a synthetic resin and dry the adhesive to form the above-mentioned adhesive layer film. A method for producing a breathable pressure-sensitive adhesive tape or sheet, characterized in that vent holes are formed along the holes.

A second aspect of the present invention is the breathable pressure-sensitive adhesive tape or sheet according to the first aspect, wherein the lattice-like base material has a void ratio of at least 15% or more, and the lattice has a void width of at least 0.8 mm or more. .

According to a third aspect of the present invention, a pressure-sensitive adhesive diluted with a solvent or water is applied to one or both surfaces of a lattice-shaped base material having synthetic resin-made openings and dried to form the above-mentioned pressure-sensitive adhesive layer film. A breathable pressure-sensitive adhesive tape or sheet, characterized in that vent holes are formed along the openings.

According to a fourth aspect of the present invention, a pressure-sensitive adhesive diluted with a solvent or water is applied to one or both sides of a lattice-shaped base material having synthetic resin pores and dried to form the above-mentioned pressure-sensitive adhesive layer film. A breathable pressure-sensitive adhesive tape or sheet, characterized in that a vent hole is formed along an opening, and a woven fabric or a non-woven fabric is laminated on one surface of the pressure-sensitive adhesive layer.

The details of the present invention will be described below. The breathable pressure-sensitive adhesive tape of the present invention uses a lattice-shaped substrate made of synthetic resin. The term "lattice-like base material" as used herein refers to a combination of a string-like body and a belt-like body made of synthetic resin in the vertical and horizontal directions.

As the synthetic resin which can be used for this lattice-shaped substrate, any resin having a certain degree of flexibility and mechanical strength may be used, but the lattice-shaped body of the lattice-shaped body of the present invention,
It is desirable that the band-shaped body is thin and supple and has high strength. To achieve such an object, a stretched material such as polyester or polyolefin is a preferable example.

The cord-like body, the belt-like body and the like made of such synthetic resin are easy to use due to their elasticity and flexibility in products.
The thickness is preferably 10 to 100 μm, and the width is preferably 1 to 10 mm. Using the string-shaped body, the band-shaped body, etc.,
A grid-like body can be obtained by regularly fixing and fixing the elements in the vertical and horizontal directions. As the method for manufacturing the lattice-shaped base material, an integral molding method, a heat-sealing method for longitudinal and lateral cords, strips, etc. and a weaving for longitudinal and transverse cords, strips, etc. Methods and the like.

In order to achieve the object of the air-permeable pressure-sensitive adhesive tape of the present invention, the lattice-like body has a void ratio of at least 15% or more,
It is necessary that the gap width is at least 0.8 mm or more. The gap ratio here means the ratio of the total area of the holes formed by the lattice to the entire area of the lattice-shaped body, and the gap width is the distance formed by each string-shaped body, band-shaped body, etc. Say

The gap ratio is 15% or less or the gap width is 0.8 m.
When it is less than or equal to m, when the applied pressure-sensitive adhesive layer shrinks, it becomes difficult for air holes to appear along the openings of the lattice-shaped substrate. As a result, the openings of the lattice-shaped base material become clogged, and it becomes impossible to stably generate the desired vent hole diameter.

The coating machine used in the present invention is not particularly limited as long as it can be used for ordinary pressure-sensitive adhesive coating, but in the case of single-side coating in view of productivity and ease of use, A coating machine of a system in which an adhesive is once formed on the surface of a roll and then transferred by pressing the roll onto a desired substrate surface to form an adhesive layer on the substrate surface is convenient. Is. Examples of such a coating machine include a kiss coater, a gravure coater, a squeeze coater, and the like, and the kiss coater is particularly effective. A dipping coater is effective for double-sided coating.

The adhesive used in the present invention should be an adhesive diluted with a solvent or water. By reducing the solid content concentration to a certain extent with a solvent or water, it will have a viscosity and fluidity that can be applied with the above-mentioned coating machine, and an adhesive composition obtained by diluting the adhesive composition with a solvent or water. After applying to the surface of the grid substrate,
The adhesive causes a shrinkage action by drying, and the adhesive layer is formed only on the part along each string or band of the lattice without the adhesive forming a continuous film on the surface of the base material. Thus, the diameter of the pores formed by the lattice-like body is expressed as air-permeable pores. Examples of the pressure-sensitive adhesive include solvent-type acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, and aqueous emulsion-based pressure-sensitive adhesives. The solid content concentration of such an adhesive is preferably 60% or less so that the above object can be achieved more reliably. The thickness of the adhesive layer formed by coating is 10 to 80.
μm, preferably 30 to 50 μm.

The pressure-sensitive adhesive tape of the present invention produced by the above method is suitable as a material for a medical tape which requires air permeability by using a woven fabric, a non-woven fabric, or the like, if necessary.

[0019]

According to the invention of claim 1, by applying an adhesive diluted with a solvent or water to one or both sides of a lattice-like substrate having openings made of a synthetic resin and drying the same, Vents can be generated in the pressure-sensitive adhesive layer film along the openings.

According to the second aspect of the invention, in the manufacturing method of the first aspect, the lattice ratio of the lattice-like base material is at least 15% or more, and the gap width formed by the lattice is at least 0.8 mm or more. By doing so, the vent hole according to claim 1 can be generated more reliably.

[0021]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is an explanatory view showing a breathable adhesive tape of the present invention. 1
Is a lattice-shaped substrate, 2 is an adhesive layer, and 3 is a breathable hole. As the band-shaped body of the lattice-shaped base material, a polyethylene resin having a thickness of 30 μm and a width of 2 mm obtained by stretching 3 times was laminated in the longitudinal and lateral directions so that the gap width was 2 mm and the gap ratio was 18%, and the temperature was 120 ° C. Then, the strips in the vertical and horizontal directions were heat-sealed by passing through a heating roll of No. 4 to prepare a sheet-like material 4 of a lattice-shaped substrate having a width of 60 cm. A kiss coater shown in FIG. 2 is used as a coating machine for the sheet-like material 4, and an aqueous acrylic emulsion-based pressure-sensitive adhesive (TK manufactured by Rohm & Haas Co., Ltd., TK
8005) 5 is applied to one surface of the sheet-like material 4 and dried to form 30 μm on the lattice-shaped substrate 1 of the sheet-like material 4.
The pressure-sensitive adhesive layer 2 was formed to have a thickness. The air-permeable pressure-sensitive adhesive tape prepared in this way was once wound up, and then 1
It was cut into a size of 0 cm × 15 cm.

As a result of magnifying and observing the pressure-sensitive adhesive tape with a microscope, the pressure-sensitive adhesive layer 2 is formed only along the band-shaped body of the lattice-shaped substrate 1, and the pressure-sensitive adhesive layer coating is formed in the pores formed by the band-shaped body. As a result, an adhesive tape having the desired air-permeable holes 3 was obtained. In addition, the air permeability of the above-mentioned adhesive tape is JIS standard P-
Based on 8117, it was measured with a galley type densometer, and as a result, the air permeability was 0.5 seconds / 300 ml, which was very good.

Further, as another embodiment, the aqueous acrylic emulsion-based pressure-sensitive adhesive 5 is applied on both sides of the sheet-like material 4 of the grid-like substrate by a dipping method (FIG. 3), and the sheet-like material is dried. The pressure-sensitive adhesive layer 2 was formed on both surfaces of the lattice-shaped base material of No. 4 to have a thickness of 30 μm. On one side of the breathable adhesive tape obtained in this way,
A rayon non-woven fabric 6 having a basis weight of 15 g / m ² was attached, and a silicone release treatment release sheet 7 was attached to the other surface to obtain a medical adhesive tape (FIG. 4). The release sheet of the medical adhesive tape prepared in this manner was peeled off, and the adhesive surface was applied to the affected area of the wound to dry the affected area and the treatment proceeded smoothly.

As a comparative example, a strip-shaped body having a thickness of 30 μm and a width of 2 mm, which was also obtained by stretching polyethylene resin three times, was used, and a grid-shaped base material having a gap width of 0.5 mm and a gap ratio of 10% was prepared and used. A pressure-sensitive adhesive tape was prepared and observed in exactly the same manner as in the examples except that the adhesive layer was not formed only on the strip-shaped portion, and the adhesive layer was formed in places on the pores formed by the strip-shaped body. It was clogged. The air permeability of the pressure-sensitive adhesive tape was measured with a Galley-type densometer based on JIS standard P-8117, and was 15 seconds / 300 ml, which was extremely low.

[0025]

As described above in detail, according to the method for producing an air-permeable pressure-sensitive adhesive tape of the present invention, it can be produced by using an ordinary pressure-sensitive adhesive coating machine, especially after the pressure-sensitive adhesive coating, high-speed spraying, etc. Efficient and stable because the adhesive does not form a continuous film on the surface of the grid-like substrate without the post-treatment and forms the adhesive layer only on the part along the strip of the grid. It is possible to produce a pressure-sensitive adhesive tape with good air permeability.

If a lattice-like substrate having pores satisfying the conditions described in the present invention is used, a pressure-sensitive adhesive tape having desired ventilation holes can be easily produced, depending on the function of the product. A breathable adhesive tape can be easily supplied, and by adhering a woven or non-woven fabric on one side of the adhesive tape, it can be used as a medical tape for fixing gauze and absorbent cotton, and can accelerate the drying of the affected area. I can.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a breathable adhesive tape in Examples.

FIG. 2 is a side view showing a manufacturing process of a breathable adhesive tape using a kiss coater in an example.

FIG. 3 is a side view showing a manufacturing process of a breathable pressure-sensitive adhesive tape by a dipping method in an example.

FIG. 4 is an explanatory diagram showing a medical adhesive tape according to another embodiment.

[Explanation of symbols]

 1 Lattice-like base material 2 Adhesive layer 3 Breathable holes 4 Sheet-like material of lattice-like base material 5 Aqueous acrylic emulsion adhesive 6 Nonwoven fabric 7 Release sheet

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Claims (4)

[Claims] 1. A pressure-sensitive adhesive diluted with a solvent or water is applied to one or both sides of a lattice-shaped substrate having openings made of a synthetic resin and dried to form the above-mentioned holes in the pressure-sensitive adhesive layer film. A method for producing a breathable pressure-sensitive adhesive tape or sheet, characterized in that vent holes are formed along the portion. 2. The lattice-like base material has a void ratio of at least 15% or more, and the lattice has a void width of at least 0.8.
The method for producing a breathable pressure-sensitive adhesive tape or sheet according to claim 1, which has a size of at least mm. 3. An adhesive layer diluted with a solvent or water is applied to one or both sides of a lattice-shaped substrate having an opening made of a synthetic resin and dried to form the above-mentioned aperture in the adhesive layer film. A breathable pressure-sensitive adhesive tape or sheet having ventilation holes formed along the portion. 4. An adhesive layer diluted with a solvent or water is applied to one or both sides of a lattice-shaped substrate having an opening made of a synthetic resin and dried to form the above-mentioned openings in the adhesive layer film. A breathable pressure-sensitive adhesive tape or sheet, characterized in that a ventilation hole is formed along the portion, and a woven fabric or a non-woven fabric is laminated on one surface of the pressure-sensitive adhesive layer.