JPH07289625A - Base material film for emergency adhesive tape - Google Patents

Abstract

PURPOSE:To provide a base material film for emergency adhesive tape fit for wound feeling, which does not contain a plasticizer, and flexible and elastic and does not press the injured part when used as a sticking plaster. CONSTITUTION:This base material film for an emergency adhesive tape is made of a nonplastic but thermally plastic resin where the tensile strength at the time of 10% elongation in longitudinal direction X is 0.2Kgf/19mm-0.7Kgf/19mm, and is larger than the tensile strength at the time of 10% elongation in width direction Y, and the ratio of the tensile strength at the time of 10% elongation in longitudinal direction X to that in width direction Y is 1.5 or over.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base film for a first-aid bandage, more specifically, a base for obtaining a first-aid bandage that is flexible and does not press the affected area and does not peel off from the skin even after long-term use. Regarding material films.

[0002]

2. Description of the Related Art In general, a first-aid bandage is made by applying an adhesive to the surface of a soft film base, applying a gauze or the like on top of it, then punching this product to a specified size, and stacking individual packages on the front and back sides. It is obtained by cutting with a predetermined size.

The soft film used in this first-aid bandage is composed of plasticized polyvinyl chloride (hereinafter referred to as plasticized PVC) prepared by a calendering method or a sol-casting method in terms of flexibility and stretchability. Many films have been used.

However, since the plasticized PVC film contains a large amount of plasticizer, the plasticizer migrates from the film to the adhesive, the adhesive strength of the adhesive is lowered, and the adhesive strength between the film and the adhesive is reduced. However, there is a drawback in that the adhesive bandage is likely to be peeled off and the adhesive bandage is easily peeled off. Furthermore, in recent years, environmental problems have become important, and the adverse effects of using PVC films containing chlorine have been discussed in various fields.

Therefore, although a flexible and stretchable polyolefin resin film has been developed as a material to replace the plasticized PVC film, a sufficient material has not been obtained yet.

For example, Japanese Patent Publication No. 57-11342 discloses a film obtained by stretching a polyolefin composition comprising ethylene-α-olefin copolymer, LDPE, and at least one of HDPE and PP.
No. 82967 discloses a base film for a first-aid bandage, which comprises a blend of a hydrocarbon-based elastomer such as ethylene-propylene rubber and ethylene-propylene-diene terpolymer, and a polyolefin such as ethylene-vinyl acetate copolymer. Is disclosed.

However, in the first-aid bandage using the polyolefin resin film base material or other types of film base materials disclosed as described above, if the film base material is softened so as not to be easily peeled off, the length of the adhesive bandage at the time of application is increased. If the film base is made hard so that it cannot be applied properly because it stretches completely in the direction, or the adhesive bandage does not stretch when applied, it becomes impossible to follow the movement of the skin when applied to a finger etc. There was a problem.

[0008]

DISCLOSURE OF THE INVENTION The present invention comprises a non-PVC resin containing no plasticizer, is a base for obtaining an emergency adhesive bandage which is flexible and does not press the affected area and does not come off from the skin even after long-term use. The purpose is to obtain a material film.

[0009]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that the tensile strength at 10% elongation in the longitudinal direction is 0.2 Kgf / 19 mm to 0.7 Kgf / 1.
A non-thermoplastic resin having a length of 9 mm, a tensile strength at 10% elongation in the longitudinal direction larger than that at 10% elongation in the transverse direction, and a ratio of tensile strength at 10% elongation in the longitudinal direction to the transverse direction of 1.5 or more. We have found a base film for emergency plasters consisting of

Examples of the non-plastic thermoplastic resin used in the present invention include polyolefin resins, polyolefin thermoplastic elastomers, polystyrene elastomers alone, and blends of these resins. Examples of the base film for a first aid bandage include a monolayer film or a laminated film made of the above-mentioned non-plasticized thermoplastic resin.

As the polyolefin resin, for example, the one obtained as follows can be used.

In the presence of the titanium compound and the aluminum compound, the propylene-based resin is first polymerized in the first stage, and then, in the second and subsequent stages, propylene and ethylene or α-olefin are copolymerized in the presence of the above compound. It is a propylene-ethylene copolymer or a propylene-α-olefin copolymer obtained by the above.

Several specific methods for producing these polyolefin resins have been proposed so far. For example, there is a method described in JP-A-4-224809.

Here, as a titanium compound, for example, titanium trioxide and magnesium chloride are co-ground and n-butyl orthotitanate, 2-ethyl-1-hexanol, ethyl p-toluate, silicon tetrachloride, diisobutyl phthalate, etc. are used. A solid titanium catalyst having a mean particle size of 15 μm, which has been treated with, is used, an alkylaluminum such as triethylaluminum is used as the aluminum compound, and a silicon compound, particularly diphenyldimethoxysilane, is added as an electron donor in the polymerization tank. Furthermore, ethyl iodide is also added.

The most important feature of this production method is that the polymerization is not completed in one step but is a multi-step polymerization of two or more steps. Therefore, it is possible to continuously produce a plurality of kinds of polymers during the polymerization, That is, a copolymer having a completely different phase structure from that of a polymer blend is produced.

Further, in the conventional resin such as block polypropylene, the second component such as ethylene to be copolymerized is contained in an amount of about 50% by weight with respect to the original propylene due to the limitation in the manufacturing process. It was the limit. Therefore, it is very difficult to give the polypropylene resin such flexibility as plasticized PVC. However, if the blend by polymerization described in JP-A-4-224809 is used, it becomes possible to contain the copolymerization component up to about 80 to 95% by weight, and a resin having the same physical properties as plasticized PVC. Is obtained.

Further, it is possible to prepare a blend which is impossible in terms of resin viscosity by blending with an ordinary extruder or the like by utilizing the blend by polymerization. A method for producing such a resin composition is disclosed in JP-A-4-96, in addition to the publications mentioned above.
912, JP 4-96907 A, JP 3
-174410, JP-A-2-170803, JP-A-2-170802, JP-A-3-205
No. 439 and Japanese Patent Laid-Open No. 61-42553 disclose similar materials. Further, in JP-A-3-97747, a product obtained by first molding an adduct of magnesium chloride and alcohol as a titanium compound and then treating with titanium tetrachloride and an electron donor is also used.

The above-mentioned polyolefin-based resin can be used without any problem by using any of these methods. Examples of commercially available resins obtained by the above manufacturing method include "PER (trade name)" marketed by Tokuyama Soda Co., Ltd. and "Cataloy (trade name)" marketed by Highmont Co., Ltd. To be

Examples of the thermoplastic polyolefin-based elastomer include ethylene-propylene rubber and ethylene-1.
-Butylene rubber, ethylene-vinyl acetate copolymer, etc. may be mentioned.

Examples of the polystyrene-based elastomer include styrene-butadiene block copolymer, styrene-isoprene block copolymer, styrene-ethylene-
Examples thereof include butylene block copolymer and styrene-propylene block copolymer. The base film for a first-aid bandage of the present invention is formed by molding the above-mentioned non-thermoplastic resin into a predetermined thickness by a usual T-die method, inflation method, calendar method, etc., and subjected to longitudinal uniaxial stretching processing or horizontal uniaxial stretching processing. Can be obtained. Further, an annealing process may be added if necessary.

In the base film for a first-aid bandage of the present invention, the longitudinal direction means the X direction shown in FIG. 1, and the width direction means the Y direction shown in FIG.

In the base film for a first-aid bandage of the present invention, the 10% elongation tensile strength in the longitudinal direction is 0.2 Kgf / 19.
mm to 0.7 Kgf / 19 mm. If this tensile strength is less than 0.2 Kgf / 19 mm, it will be difficult to attach due to stretching when applying the plaster, or it will be stretched and loosened more than necessary during expansion and contraction of the fingers after application. Occurs. In addition, this tensile strength is 0.7 Kg
If it exceeds f / 19 mm, the tensile strength will be too large, and sufficient elongation will not occur during and after application, resulting in poor texture, difficulty in fitting to the skin, and strong resistance during expansion and contraction of fingers. Occurs.

In the present invention, the tensile strength in the width direction orthogonal to the longitudinal direction is smaller than that in the longitudinal direction, and the ratio of the tensile strength at 10% elongation in the width direction to the tensile strength at 10% elongation in the longitudinal direction is 1.5 or more. It is necessary to be. The reason for this is as follows.

When the adhesive bandage is applied to the toes and toes, especially when it is applied on the joint, a large expansion / contraction motion occurs in the width direction along with the movement of the finger, and the tensile strength at 0% extension in the longitudinal direction is 0. .2 Kgf / 19 mm to 0.7 Kgf / 19
Even if the thickness is mm, there is a problem that the longitudinal edge is peeled from the skin after long-term use. In order to solve this problem, it is necessary that the tensile strength in the width direction be smaller than that in the longitudinal direction, and in order to sufficiently deal with the problem of peeling during long-term use, 10% in the longitudinal direction and the width direction. It is necessary that the ratio of tensile strength during extension is 1.5 or more. If this ratio is less than 1.5, the longitudinal edge portion will peel off from the skin when the bandage is applied to a site where a large stretching motion in the width direction occurs, such as on the finger joint, and used for a long time.

As described above, according to the present invention, a base film for a first-aid bandage, which does not contain a plasticizer, is flexible and stretchable, does not press the affected part when used as a bandage, and has a good texture be able to.

The reason why such a result is obtained is estimated as follows.

As the non-plasticized thermoplastic resin used in the present invention, a polypropylene resin will be described as an example.
It is considered that an amorphous polymer represented by a propylene copolymer or the like is introduced and alloyed in a large amount during the polymerization.

The use of titanium-based catalysts, which are very active and have a long life, seems to allow some manufacturers to construct this type of resin. It is considered that there are some copolymers having different molecular structures in the polymer obtained by such polymerization, and therefore, a characteristic morphology is exhibited in the normal resin part such as polypropylene and the alloy of these copolymer parts.

As a result, it is considered that the base film for a first-aid plaster according to the present invention exhibits physical properties very close to those of a plasticized PVC base, even though it is a material containing no crosslink in the resin.

[0030]

[Function] 1 in the longitudinal direction as a base film for first aid bandages
Tensile strength at 0% elongation 0.2Kgf / 19mm-0.7K
By setting gf / 19 mm, it is possible to obtain a first-aid bandage that is easy to apply, has a good fit to the skin, does not have a feeling of pressure, and has a good texture. Moreover, the tensile strength at 10% elongation in the longitudinal direction is larger than that at 10% elongation in the width direction,
By setting the ratio of tensile strength at the time of 10% extension in the longitudinal direction to that of 1.5% or more, it can be used for a long time by sticking it on a site where a large stretching motion occurs in the width direction, such as on a finger joint. However, it is possible to obtain a first aid bandage in which the longitudinal edge portion does not come off from the skin.

[0031]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

The base film for a first-aid bandage or the first-aid bandage in the examples has a tensile strength, a sticking property to a human body (finger), a feeling of wearing on a human body (finger), and peeling after long-time wearing on the human body (finger). The test was carried out as follows. See also
Means "parts by weight".

Tensile strength: Width of sample is 19m by tensile tester
m, initial sample length (grip interval) 100 mm, pulling speed 2
The tensile strength at an elongation of 10% when pulled at 00 mm / min was measured.

Applicability to human body (finger): When the first-aid bandage was applied to the second joint of the index finger, it was evaluated whether there was a problem of wrinkling or being too hard.

Feeling of wearing on human body (finger): The first-aid bandage was wrapped around the second joint of the index finger, and the feeling (compression) when the finger was bent or extended was evaluated.

Peelability when worn and used on human body (finger): The first-aid bandage was wrapped around the second joint of the index finger and used for 12 hours normally, and then the presence or absence of peeling of the edge part was observed and evaluated.

Example 1 Polypropylene resin (PER: R210 manufactured by Tokuyama Soda Co., Ltd.)
E) 100 parts and polypropylene resin (Highmont Catalloy: KS052) 50 parts were mixed and extruded by a T-die at a mold temperature of about 240 ° C. to form a film, and then using a normal vertical uniaxial roll drawing machine, a drawing roll temperature. The film was stretched twice at 120 ° C., then the surface was subjected to corona discharge treatment, and then wound to obtain a base film for a first-aid bandage having a thickness of 50 μm.

The tensile strength of the thus obtained base film was measured in the longitudinal direction (MD) and the width direction (TD).
The results are shown in Table 1.

Next, as shown in FIG. 2, a process paper 3 in which a polyethylene layer is laminated on one side of kraft paper and a silicone release agent is applied to the surface of the polyethylene layer.
A rubber-based pressure-sensitive adhesive solution (natural rubber, polyterpene resin, polybutene, 35% toluene solution of anti-aging agent) is applied to the release treated surface 32 of the coating solution by a coating and drying winder so that the thickness after drying is 40 μm. , And then laminate the base film 1 and the process paper 3 with the pressure-sensitive adhesive layer 2 so that the corona-treated surface 12 of the base film 1 obtained above and the pressure-sensitive adhesive layer 2 adhere to each other, With the process paper 3 attached, it was wound into a roll by a winder. Next, this roll-shaped tape raw material was cut into a 19 mm width by using a slitter so that the film layer 1 and the process paper 3 were not separated from each other, and a long length (200
m). The obtained raw tape for a first-aid bandage was processed into a first-aid bandage by the first-aid bandage processing step shown in FIG.

The processing device used for this is provided with a device for supplying auxiliary materials for a first-aid bandage (gauze, release paper for replacement, individual wrapping paper, etc.) with a predetermined width, and the first-aid bandage tape A is fed out. Then, the soft film layer 1 and the pressure-sensitive adhesive layer 2 of the original fabric A are first subjected to ordinary fine perforation processing 41, and then the process paper 3 is peeled off, and then the pressure-sensitive adhesive layer 2 has a thickness of 1 m on the upper surface.
m, width 17 mm × length 25 mm gauze 42 is attached,
After that, a new release paper 43 is newly placed on the upper surface of the gauze 42, and then this laminate is given a predetermined size (width 19 mm × length 7).
5mm, both ends punched into an arc shape with a radius of 12mm 4
4 and the first-aid bandage sample B shown in FIG. In addition, in FIG. 1, the X direction indicates the longitudinal direction of the base film, and the Y direction indicates the width direction of the base film.

The first-aid bandage sample was attached to the index finger, and the "sticking property", "feeling of wearing", and "peeling property when wearing and using" were evaluated by the above-mentioned methods. The results are shown in Table 1.

Example 2 A base film for a first aid bandage and a first aid bandage sample were prepared and evaluated in the same manner as in Example 1 except that the film thickness was 70 μm. The results are shown in Table 1.

Example 3 Polypropylene resin (Cataloy: K manufactured by Highmont Co., Ltd.)
S052) 100 parts, 50 parts ethylene-propylene rubber (manufactured by Mitsui Petrochemical Co., Ltd .: P-280) 50 parts were used to prepare a base film for an emergency adhesive plaster and an emergency adhesive plaster sample in the same manner as in Example 1. evaluated. The results are shown in Table 1.

Example 4 Polypropylene resin (Cataloy: K manufactured by Highmont Co., Ltd.)
Example 1 except that 100 parts of S052) and 20 parts of styrene-isoprene-styrene rubber (Califlex TR / Clayton D: TR1107P manufactured by Shell Japan Co., Ltd.) were used and the roll temperature of the longitudinal uniaxial roll drawing process was 110 ° C. In the same manner as above, a base film for a first aid bandage and a first aid bandage sample were prepared and evaluated. The results are shown in Table 1.

Comparative Example 1 A base film for an emergency adhesive plaster and an emergency adhesive plaster were prepared in the same manner as in Example 1, except that the stretching was not performed by a longitudinal uniaxial roll stretching machine and the thickness of the obtained substrate film was 40 μm. A sample was created and evaluated. The results are shown in Table 1. Comparative Example 2 Example 1 except that the film thickness was 100 μm.
In the same manner as above, a base film for a first aid bandage and a first aid bandage sample were prepared and evaluated. The results are shown in Table 1.

Comparative Example 3 A base film for a first-aid bandage and a first-aid bandage sample were prepared in the same manner as in Example 1 except that the longitudinal uniaxial roll stretching process was not performed after the resin was extruded by a T-die.
evaluated. The results are shown in Table 1.

Comparative Example 4 A base film for an emergency bandage and a sample for an emergency bandage were prepared and evaluated in the same manner as in Comparative Example 1 except that the thickness of the base film in Comparative Example 1 was 80 μm. The results are shown in Table 1.

[0048]

[Table 1]

[0049]

EFFECTS OF THE INVENTION According to the present invention, it is possible to obtain a base film for an emergency adhesive plaster that does not contain a plasticizer, is flexible and stretchable, does not press the affected area when used as an adhesive plaster, and has a good texture. it can.

Therefore, the adhesive bandage obtained by using this base film has "sufficient strength" necessary for application to the skin and, at the same time, has a favorable texture and feel as an adhesive bandage, and after application. There is an advantage that the edge of the bandage does not rise from the skin even if it is used for a long time.

[Brief description of drawings]

FIG. 1 is a plan view of a first-aid bandage sample.

FIG. 2 is a cross-sectional view showing a state in which a base film and a process paper with an adhesive layer are laminated.

[Fig. 3] Fig. 3 is a schematic view showing a manufacturing process of the first-aid bandage.

[Explanation of symbols]

 A: Original tape for first-aid bandage 1: Film layer 2: Adhesive layer 3: Process paper 12: Corona treated surface 32: Release treated surface 41: Drilling 42: Gauze 43: Releasing paper for replacement 44: Punching processing

Claims (1)

[Claims] 1. A film formed of at least one thermoplastic resin selected from the group consisting of polyolefin resins, polyolefin elastomers and polystyrene elastomers, stretched at least in the longitudinal direction,
Tensile strength at 10% elongation in the longitudinal direction is 0.2 Kgf / 19 m
m-0.7 Kgf / 19 mm, 10% in the longitudinal direction
The tensile strength at extension is greater than the tensile strength at 10% elongation in the width direction, and the ratio of the tensile strength at 10% elongation in the longitudinal direction and the transverse direction is 1.
A base film for an emergency bandage, which is 5 or more.