JP6218513B2 - Base film for emergency bandage and emergency bandage - Google Patents

Description

The present invention relates to a base film for an emergency bandage and an emergency bandage.

In general, an emergency bandage is one in which an adhesive layer is provided on a soft film and a liquid-absorbing pad such as gauze is provided in the central area of the adhesive layer. Conventionally, the above-mentioned soft film has elasticity in a low elongation area (elongation area necessary for using a bandage), and when wound around a finger joint or the like, even if it is repeatedly bent and stretched, it does not loosen. A material made of a soft vinyl chloride resin has been widely used because it is a well-balanced material with a small amount of tightening.

However, in recent years, since vinyl chloride resin films contain chlorine, it has been regarded as a problem to generate toxic substances during disposal by incineration, and is further incorporated into vinyl chloride resins. Regarding the safety of plasticizers, there are concerns about harmful effects on the environment and the human body.
In addition, the plasticizer contained in the vinyl chloride resin film migrates into the adhesive layer over time, reducing the cohesive strength of the adhesive, causing adhesive residue on the skin when the emergency bandage is peeled off. It might be a cause.

Under such circumstances, recently, it has been proposed to use a polyolefin resin film containing no chlorine as a base film for an emergency bandage.
For example, Patent Document 1 discloses that a polyolefin resin film having a polymerization density of 0.890 to 0.940 g / cm ³ and a melt flow rate of 2.5 to 20 g / 10 min is used as a linear resin film. There has been proposed a base film for emergency adhesive bandage formed of low density polyethylene alone or a resin composition containing the linear low density polyethylene as a main component.

In Patent Document 2, after melt-forming a film composed of 30 to 50% by weight of a polyethylene-based mixture composed of linear low density polyethylene and low density polyethylene and 50 to 70% by weight of an inorganic filler, A pressure-sensitive adhesive tape is proposed in which an acrylic pressure-sensitive adhesive layer is laminated on a microporous film substrate obtained by uniaxially stretching or biaxially stretching the obtained unstretched film.

In general, the base film for an emergency bandage has, as its characteristics, for example, (1) excellent texture (flexibility and stretchability), (2) having sufficient strength to avoid breakage at the time of peeling, Etc. are required.
However, the base film for emergency bandages made of polyolefin resin film has a problem that it is easily broken when peeled off from the skin after use.
In addition, in order to avoid breakage at the time of peeling, a method of increasing the modulus of the film by increasing the thickness of the film or adding polypropylene or high-density polyethylene can be considered. The modulus in the elongation rate region also increases and the texture deteriorates.

JP 2002-17844 A JP 2003-305079 A

Therefore, the present inventors have made extensive studies to solve the above-mentioned problems, and two types of linear low-density polyethylene (m-LLDPE and c-LLDPE) and low-density polyethylene (LDPE) have a specific weight ratio. The present invention was completed by finding that the base film for emergency adhesive bandage formed by molding the resin composition blended in 1) was not broken at the time of peeling and excellent in texture.

The base film for emergency bandage of the present invention includes linear low density polyethylene (m-LLDPE) polymerized using a metallocene catalyst and linear low density polyethylene (c-) polymerized using a Ziegler-Natta catalyst. LLDPE) and a resin composition containing low density polyethylene (LDPE),
Weight ratio of linear low density polyethylene polymerized using the metallocene catalyst, linear low density polyethylene polymerized using the Ziegler-Natta catalyst, and the low density polyethylene (m-LLDPE: c -LLDPE: LDPE) is 30-45: 40-65: 5-20.

The base film for emergency bandage of the present invention preferably has a thickness of 20 to 100 μm, and preferably has a total light transmittance of 85% or more.

In the base film for emergency bandage of the present invention, the resin composition preferably further contains high-density polyethylene (HDPE).
Moreover, it is preferable that the said resin composition contains only polyethylene as a resin component.

The emergency adhesive bandage of the present invention is characterized in that an adhesive layer is laminated on one side of the base film for emergency adhesive bandage of the present invention.

The base film for emergency bandage of the present invention comprises a resin composition obtained by blending two types of linear low density polyethylene (m-LLDPE and c-LLDPE) and low density polyethylene (LDPE) at a specific weight ratio. Therefore, the emergency bandage provided with such a base film does not break when peeled and is excellent in texture. Therefore, such an emergency bandage is easy to apply to the skin and easy to peel off from the skin, and also has excellent followability to the skin.
Moreover, the emergency adhesive bandage provided with the base film for emergency adhesive bandage of the present invention can be suitably manufactured by extrusion molding.

FIG. 1 is a cross-sectional view schematically showing an example of an emergency bandage according to the present invention. FIG. 2 is a schematic view for explaining an example of a method for producing the emergency bandage of the present invention. FIG. 3 is a schematic view for explaining another example of the method for producing the emergency bandage of the present invention.

Hereinafter, embodiments of the present invention will be described in detail.
First, the base film for emergency adhesive plaster of the present invention (hereinafter also simply referred to as a base film) will be described.
The base film for emergency bandage of the present invention includes linear low density polyethylene (m-LLDPE) polymerized using a metallocene catalyst and linear low density polyethylene (c-) polymerized using a Ziegler-Natta catalyst. LLDPE) and a resin composition containing low density polyethylene (LDPE),
Weight ratio of linear low density polyethylene polymerized using the metallocene catalyst, linear low density polyethylene polymerized using the Ziegler-Natta catalyst, and the low density polyethylene (m-LLDPE: c -LLDPE: LDPE) is 30-45: 40-65: 5-20.

The resin composition constituting the base film of the present invention is a polymer obtained by polymerization using low-density polyethylene (LDPE) and two types of linear low-density polyethylene as a linear low-density polyethylene, that is, a metallocene catalyst. It is technically characterized by containing a predetermined amount of linear low density polyethylene (m-LLDPE) and linear low density polyethylene (c-LLDPE) polymerized using a Ziegler-Natta catalyst.
And since a predetermined amount of two types of linear low-density polyethylene is contained together with the low-density polyethylene, the film is not broken at the time of peeling, and the texture is excellent. About this reason, it estimates as follows.
Since linear low density polyethylene (m-LLDPE and c-LLDPE) is linear with fewer side chains than LDPE, a film is prepared by blending linear low density polyethylene into a film. The strength of is increased. Therefore, by using such a film for an emergency bandage, it is possible to obtain an emergency bandage that is difficult to break when the emergency bandage is peeled off.
Further, in the emergency bandage, the texture at the time of application and use also depends on the density of the material resin of the film for emergency bandage, and the film can be made softer as the resin having a lower density is used. Here, since m-LLDPE generally tends to have a lower density than LDPE, the use of m-LLDPE as the material resin for the base film for emergency bandage can improve the strength of the film for emergency bandage. Not only can the texture of the emergency bandage be improved.
On the other hand, by blending m-LLDPE, the effect of improving the strength of the film and making it difficult to break can not be said unconditionally when the film is greatly stretched (because it also depends on the thickness of the film, , When it is stretched by 300%), it does not show a significant effect when it is stretched by several percent (up to about 10%) when the emergency bandage is peeled off from the adherend. In contrast, c-LLDPE tends to have an initial modulus (10% modulus) higher than that of m-LLDPE. Therefore, when c-LLDPE is blended as linear low-density polyethylene, emergency adhesive bandage Even when the film for emergency adhesive plaster is stretched by several percent as in the case of peeling, the film for emergency adhesive plaster can be reliably prevented from breaking.
From these, by blending a predetermined amount of two types of linear low density polyethylene (m-LLDPE and c-LLDPE) together with low density polyethylene (LDPE), the film does not break at the time of peeling, and It is thought that it can be used as a film for an emergency adhesive plaster having an excellent texture.

In the resin composition, a weight ratio of the linear low density polyethylene polymerized using the metallocene catalyst, the linear low density polyethylene polymerized using the Ziegler-Natta catalyst, and the low density polyethylene. (M-LLDPE: c-LLDPE: LDPE) is 30-45: 40-65: 5-20.
In the above resin composition, when the weight ratio of linear low density polyethylene (m-LLDPE) polymerized using a metallocene catalyst is less than 30, the initial modulus (10% modulus) increases and the followability to the skin. For example, a gap may be formed between the skin and the emergency adhesive bandage when the joint part to which the emergency adhesive bandage is attached is bent. On the other hand, when it exceeds 45, the initial modulus (10% modulus) is lowered and the followability to the skin is improved. For example, when the emergency adhesive bandage is peeled from the skin, the emergency adhesive bandage (base film) is easily several hundreds. %, It becomes difficult to peel off.

Further, in the above resin composition, when the weight ratio of linear low density polyethylene (c-LLDPE) polymerized using a Ziegler-Natta catalyst is less than 40, the initial modulus (10% modulus) becomes low, and the skin For example, when the emergency adhesive bandage is peeled from the skin, the emergency adhesive bandage (base film) is stretched by several hundred%, but it becomes difficult to peel off. On the other hand, if it exceeds 65, the initial modulus (10% modulus) becomes high and the followability to the skin becomes poor. For example, when bending the joint part to which the emergency adhesive bandage is applied, the gap between the skin and the emergency adhesive bandage There may be gaps.

Moreover, in the said resin composition, when the weight ratio of low density polyethylene (LDPE) is less than 5, the workability (neck-in, surging, resonance) of the base film for emergency adhesive plaster deteriorates.
On the other hand, when it exceeds 20, the initial modulus (10% modulus) of the base film for emergency adhesive bandage becomes high, the texture as an emergency adhesive bandage becomes worse, and the breaking strength becomes low.

In the resin composition, a preferable weight ratio (m-LLDPE: c-LLDPE: LDPE) is 30 to 45:45 to 65: 5 to 15.

The low-density polyethylene preferably has a density of 0.91 to 0.94 g / cm ³ .
Specific examples of the low density polyethylene include Novatec LD LC500, LF448K, LF128, and LF342M (all manufactured by Nippon Polyethylene Co., Ltd.).

The linear low density polyethylene (m-LLDPE) polymerized using the metallocene catalyst preferably has a density of 0.88 to 0.91 g / cm ³ , and 0.88 to 0.90 g / cm ^3. It is more preferable that
When the density exceeds 0.91 g / cm ³ , the modulus in the low elongation region of the base film is increased, and the breaking strength may be decreased. On the other hand, when the density is less than 0.88 g / cm ³ , the base film becomes too soft, and when used as an emergency bandage, the base film easily stretches at the time of peeling from the skin and is difficult to peel off. It is difficult to peel off the emergency adhesive bandage from the release paper due to the softness of the base film and the low density of the surface due to the use of low density polyethylene. It may become.

The density of the linear low density polyethylene (m-LLDPE) polymerized using the metallocene catalyst is the density of the linear low density polyethylene (c-LLDPE) polymerized using the Ziegler-Natta catalyst. Is preferably smaller. This is because the texture can be improved when using an emergency bandage.

The m-LLDPE preferably has a melting point of 80 to 110 ° C.
The m-LLDPE preferably has a melt flow rate (hereinafter also simply referred to as MFR) of 1 to 10 g / min.

The linear low density polyethylene (c-LLDPE) polymerized using the Ziegler-Natta catalyst preferably has a density of 0.91 to 0.94 g / cm ³ .
When the density exceeds 0.94 g / cm ³ , the initial modulus (10% modulus) increases and the followability to the skin deteriorates. For example, when the joint part to which an emergency adhesive bandage is applied is bent, There may be a gap between the and the first aid bandage. On the other hand, when the density is less than 0.91 g / cm ³ , the modulus in the low elongation rate region is low, and the base film is easily stretched when the emergency adhesive bandage is peeled off, and is difficult to peel off.
Further, in the emergency bandage, there are cases where holes are made in order to improve the air permeability. At this time, the holes are generally made by a punching method using a needle. Here, if the density of c-LLDPE is less than 0.91 g / cm ³ , the base film may be too soft and the needle may be difficult to penetrate.
From the viewpoint that these disadvantages are less likely to occur, a more preferable density of c-LLDPE is 0.91 to 0.93 g / cm ³ .

The c-LLDPE preferably has a melt flow rate (MFR) of 1 to 10 g / min.

Examples of such linear low density polyethylene (m-LLDPE and c-LLDPE) include those made of a copolymer of ethylene and an olefin having 4 to 10 carbon atoms. Examples of the olefin having 4 to 10 carbon atoms include α-olefins such as 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene.
The amount of the olefin having 4 to 10 carbon atoms varies depending on the linear low density polyethylene, but is usually about 0.015 to 0.15 mol, preferably 0.02 to 0, per 1 mol of ethylene. About 0.08 mole.
The linear low density polyethylene may be a copolymer of polyenes together with ethylene and α-olefin. Examples of the polyenes include conjugated dienes such as butadiene and isoprene, Non-conjugated dienes such as 4-hexadiene, dicyclopentadiene, 5-vinyl-2-norbornene and the like can be mentioned.

Specific examples of the m-LLDPE include Evolue-P SP9040 and Evolue-P SP0540 (both manufactured by Prime Polymer Co., Ltd.).
Specific examples of the c-LLDPE include, for example, MORETEC 0218CN, MORETEC 0238CN, MORETEC 0258CN, MORETEC V-0398CN (all manufactured by Prime Polymer Co., Ltd.).

The resin composition preferably further contains high density polyethylene (HDPE).
By containing high-density polyethylene, the initial modulus of the base film for emergency bandage is increased, the breaking strength is increased, and further, when the hole is punched (punched), the beard is generated on the base film for emergency bandage. This is because it is possible to enjoy the effect of preventing this.

The high density polyethylene preferably has a density of 0.94 g / cm ³ or more.
Specific examples of the high-density polyethylene include T8150 (manufactured by Keiyo Polyethylene Co., Ltd.).

The content of the high-density polyethylene is preferably 0 to 5 parts by weight with respect to a total of 100 parts by weight of the m-LLDPE, the c-LLDPE, and the LDPE.
When the amount exceeds 5 parts by weight, the initial modulus of the base film for emergency adhesive bandage becomes too large, the texture deteriorates and the transparency may be lowered.

The resin composition may contain various additives in addition to LLDPE and LDPE.
However, it is preferable to contain only polyethylene as a resin component.
For example, in the case of containing polypropylene as a resin component other than polyethylene, the modulus of the low elongation region increases together with the modulus of the entire base film for emergency adhesive bandage, and the texture when applied to the skin may be reduced. Because.
Moreover, for example, when a rubber component is contained as a resin component other than polyethylene, the base films for emergency adhesive bandages are likely to be in close contact with each other, and a blocking phenomenon may occur. Further, in the emergency bandage, the rubber component may blow out on the film surface and cause a decrease in adhesive strength. Furthermore, the printability at the time of printing may be inferior.
In addition, in this invention, the low elongation rate area | region of the base film for emergency adhesive bandages means the area | region until the length expands 10%, when extending a base film. Usually, when the adhesive bandage is stuck to a joint or the like, it is considered that the elongation rate at which the adhesive bandage is extended is up to about 10%.

Examples of the additives include colorants, light stabilizers, antioxidants, ultraviolet absorbers, modifiers, fillers, flame retardants, antistatic agents, antifungal agents, and lubricants.

The first adhesive bandage base film preferably has a total light transmittance of 85% or more.
This is because it does not stand out when it is applied to the skin as an emergency bandage.
In the present invention, the total light transmittance is the ratio of the transmitted light beam to the parallel incident light beam of the film, and the larger the value of the total light transmittance, the higher the transparency of the base film for emergency adhesive bandage.
The total light transmittance may be measured according to JIS K 7361-1.

The base film for an emergency bandage may be subjected to a surface treatment on its surface, particularly on the side in contact with the pressure-sensitive adhesive layer when used as an emergency bandage. This is because the adhesiveness with the pressure-sensitive adhesive layer can be improved.
Examples of the surface treatment include conventionally known surface treatments such as corona discharge treatment, plasma treatment, and flame treatment. Among these, corona treatment is common in consideration of the width of the film (which can be widened) and productivity.
Moreover, when it is set as the emergency adhesive bandage of the said base film for emergency adhesive bandages, the primer layer may be formed in the surface in the side which contact | connects an adhesive layer. Thereby, the adhesiveness with the pressure-sensitive adhesive layer can be improved.

The base film for emergency bandage may have a pattern, product information, etc. drawn on its surface.
Moreover, the base film for emergency adhesive bandages may be embossed on the surface, or may be perforated on the base film itself.

The base film for the emergency bandage preferably has a 10% modulus of 3.5 to 5.0 N / 19 mm in at least one direction (in particular, the direction in which the emergency bandage is used). When the 10% modulus is in the above range, the flexibility and stretchability in the low elongation rate region are good, and it becomes easy to apply when the first adhesive bandage is used as an emergency bandage.
On the other hand, if the 10% modulus is less than 3.5 N / 19 mm, it may be too soft to return to its original shape by a little stretching, and if it exceeds 5.0 N / 19 mm, the flexibility becomes insufficient. , The texture is inferior, the ease of sticking to the skin is poor, and the followability to the skin may be insufficient. Moreover, it may become difficult to peel off from the skin.

The above-mentioned base film for emergency adhesive bandage preferably has a 50% modulus of 5.5 N / 19 mm or more in at least one direction (particularly the direction in which the emergency adhesive bandage is used).
When removing the emergency bandage, it usually stretches by about 50%, so if the 50% modulus is within the above range, it is suitable for easily and reliably peeling the emergency bandage from the skin. is there.
On the other hand, if the 50% modulus is less than 5.5 N / 19 mm, it is likely to be cut when the emergency bandage is peeled from the skin, and as a result, it may be difficult to peel from the skin.
Further, the upper limit of the 50% modulus is not particularly limited, and even if the value is large, it can be used as an emergency bandage, and the upper limit allows the 10% modulus to be 3.5 to 5.0 N / 19 mm. It is preferable that the value be

It is preferable that the base film for an emergency bandage has a breaking strength by a tensile test of 15 N / 19 mm or more in at least one direction (in particular, the direction in which the emergency bandage is used). When the breaking strength is less than 15 N / 19 mm, the strength is insufficient, and in the emergency bandage using the above-mentioned emergency adhesive bandage base film, the strength of the base film is small compared to the adhesion between the skin and the adhesive layer, and the skin There is a risk of damage when peeled off.

It is preferable that the base film for an emergency bandage has a breaking elongation by a tensile test of 300% or more in at least one direction (particularly, the direction in which the emergency bandage is used). When the breaking elongation is less than 300%, the emergency adhesive bandage using the base film for emergency adhesive bandage may break when it is peeled from the skin.

In the present invention, the 10% modulus, 50% modulus, breaking strength and breaking elongation are as follows: strip pieces each having a width of 19 mm, chuck interval 50 mm, distance between marked lines 50 mm, tensile speed 300 mm / min, and temperature 23 ° C. It is a measured value.

It is preferable that the said base film for emergency adhesive bandages is 20-100 micrometers in thickness.
If the thickness is less than 20 μm, the base film is not stiff and may be difficult to attach. On the other hand, if the thickness exceeds 100 μm, the base film may have high rigidity and poor usability.
More preferably, it is 40-80 micrometers.

It is preferable that the said base film for emergency adhesive bandages is a single layer film.
In the case of a laminated film, in order to improve the thickness accuracy of each layer, LLDPE and LDPE combined by MFR and resin compatibility are limited. For example, if the compatibility of each layer is low, the thickness accuracy of each layer and the whole is reduced. In the case of a single-layer film, LLDPE (m-LLDPE and c-LLDPE) and LDPE can be arbitrarily blended, whereas the interface unevenness occurs at the interface between layers. is there.
Moreover, in the case of a single layer film, the loss part (ear trimming part) which generate | occur | produced in the manufacture process can be utilized effectively as a recycled material.
Furthermore, in the case of a single layer film, it will be excellent in curling resistance compared with a laminated film.

It is preferable that the said base film for emergency adhesive bandages is shape | molded by extrusion molding.
As described above, the base film for emergency bandage includes two types of linear low density polyethylene (m-LLDPE and c-LLDPE) and a resin composition containing low density polyethylene (LDPE) at a specific blending ratio. It is because it is suitable for manufacturing with high productivity by extrusion molding.
In the film production method by extrusion, when the production speed is increased, the necking-in phenomenon (film width change), surging phenomenon, resonance phenomenon, etc. of the film discharged from the T-die occur with the increase in production speed. I am concerned about the problem.
However, the above-mentioned base film for emergency bandage is difficult to control the temperature at the time of molding in terms of molecular weight distribution and melt tension, and has a wide molecular weight distribution and high melt tension together with LLDPE, which is relatively prone to surging and resonance problems. Since LDPE is blended, the above problem hardly occurs even when the production rate is increased, as compared with a resin composition consisting of LLDPE alone or containing a relatively large amount of LLDPE.
Furthermore, since two types of linear low density polyethylene (m-LLDPE and c-LLDPE) are used, the moldability by extrusion molding is excellent. The reason for this is that m-LLDPE alone has high viscosity and low melt tension, so that problems of neck-in, surging, and resonance are likely to occur during molding, whereas c-LLDPE has a wide molecular weight distribution in m-LLDPE. This is considered to be because the temperature range of the molding process is widened by combining the two.
Moreover, combining LDPE broadens the temperature range of the molding process and lowers the viscosity. Therefore, combining LDPE is considered to contribute to improving moldability.

The base film for emergency bandage of the present invention having such a configuration can be suitably used as a base film for emergency bandage.

Next, the emergency bandage of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view schematically showing an example of an emergency bandage according to the present invention.
The emergency adhesive bandage of the present invention is characterized in that an adhesive layer is laminated on one side of the above-described base film for emergency adhesive bandage of the present invention.

As shown in FIG. 1, in the emergency bandage 10 of the present invention, an adhesive layer 12 is laminated on one side of a base film 11, and a release paper 13 is provided on the side opposite to the base film 11 side of the adhesive layer 12. Are stacked.
Here, the base film 11 is a base film for an emergency bandage according to the present invention. Moreover, what is necessary is just to laminate | stack the release paper 13 as needed. Moreover, although not shown in figure, between the adhesive layer 12 and the release paper 13, liquid absorbing pads, such as gauze, may be arrange | positioned.

Examples of the pressure-sensitive adhesive layer 12 include a layer made of an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, and a silicone-based pressure-sensitive adhesive.
Here, each pressure-sensitive adhesive may be a solvent type or an emulsion type, but is preferably a hot-melt pressure-sensitive adhesive.
Hot melt adhesives are solid and sticky at room temperature, and are materials that can be applied to adherends by heating and melting the resin. There is no fear that the solvent remains, and there is no concern about adverse effects such as irritation to the skin. In addition, since no solvent is used, it is environmentally friendly. On the other hand, the solvent-type pressure-sensitive adhesive may contain a residual solvent in the product. As a result, there are concerns about adverse effects such as irritation to the skin, and there is a possibility of adversely affecting the environment.
In addition, when forming a pressure-sensitive adhesive layer using a hot-melt pressure-sensitive adhesive, a drying step (drying device) for volatilizing the solvent is unnecessary, which is suitable for improving the productivity (production rate). In addition, the equipment can be downsized.

The hot-melt pressure-sensitive adhesive contains an acrylic polymer as a base polymer, and preferably has a softening point of 100 to 140 ° C. and a melt viscosity of 8000 to 40,000 m · Pa · s / 160 ° C. The first or second first-aid adhesive bandage to be described later can secure the adhesive force normally required for an emergency bandage (for example, an adhesive force of 5.0 to 9.0 N / 19 mm) and is excellent in productivity. It is because it is suitable as an adhesive layer formed with this manufacturing method.

Here, as an acrylic polymer used as a base polymer, for example, 2-ethylhexyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, dodecyl (meth) acrylate, stearyl (meth) And (co) polymers containing acrylate or the like as a monomer component.

The hot melt pressure-sensitive adhesive contains synthetic rubber as a base polymer, and preferably has a softening point of 80 to 130 ° C and a melt viscosity of 1000 to 20000 m · Pa · s / 160 ° C. The first or second first-aid adhesive bandage to be described later can secure the adhesive force normally required for an emergency bandage (for example, an adhesive force of 5.0 to 9.0 N / 19 mm) and is excellent in productivity. It is because it is suitable as an adhesive layer formed with this manufacturing method.

Here, as a synthetic rubber used as a base polymer, for example, a styrene-isoprene-styrene copolymer (SIS), a styrene-butadiene-styrene copolymer (SBS), a SEPS rubber obtained by hydrogenating SIS, and the like can be given. .

Since the first adhesive bandage needs to maintain its adhesiveness while following the movement of the skin such as bending of the joint, the adhesive force measured by the following method is 5.0 to 9.0 N / 19 mm. It is preferable. When the adhesive strength is less than 5.0 N / 19 mm, the adhesive strength is insufficient, so that the end portion is easily peeled off during use, and does not follow the movement of the skin, so that a float occurs between the skin and the adhesive bandage film. If it exceeds 9.0 N / 19 mm, the adhesive force is too strong, which inhibits the movement of the skin and is inferior to the feeling of use (wearing feeling).
The adhesive strength is a 19 mm width × 180 mm long emergency adhesive bandage as a measurement sample, which is attached to a bakelite plate and held at a load of 2 kg (one reciprocation) for 10 minutes, and then the adhesive strength is set at a speed of 300 mm / min, 180 ° Measure by peeling.

The adhesive strength of the first-aid adhesive bandage is preferably maintained at 80% or more of the adhesive strength immediately after production after storing for 6 months at 40 ° C. and 75%. In this case, it is considered that room temperature storage is possible in a boxed state for about 3 years.

The emergency bandage of this invention which consists of such a structure can be suitably manufactured by the 1st or 2nd manufacturing method mentioned later, for example.

Next, a method for producing the emergency bandage will be described with reference to the drawings.
As a method of manufacturing the above-mentioned emergency adhesive bandage, after performing a process of forming an emergency adhesive bandage base film by extrusion, an adhesive layer is continuously formed on the emergency adhesive bandage base film by extrusion molding. A method of performing the step is preferred.
As a manufacturing method of such an emergency adhesive bandage, the manufacturing method of the 1st emergency adhesive bandage mentioned in detail below, the manufacturing method of the 2nd emergency adhesive bandage, etc. are mentioned, for example.

First, the manufacturing method (henceforth the 1st manufacturing method) of a 1st emergency adhesive bandage is demonstrated.
FIG. 2 is a schematic diagram for explaining the first manufacturing method.
The first manufacturing method can be performed by a manufacturing line (manufacturing apparatus) 100 as shown in FIG.

The production line 100 includes a base film forming zone 129 for forming the base film 111 and an adhesive layer laminating zone 136 for laminating the adhesive layer 112 on the base film 111.
In the base film forming zone 129, first, m-LLDPE, c-LLDPE and LDPE are blended using a mixer (not shown) to prepare a resin composition (material composition) containing them. Subsequently, this resin composition is put into the extruder 120 through a hopper 121 provided in the extruder 120. The charged resin composition is melted and kneaded in the extruder 120, and is extruded into a film form from a T-die 122 disposed at the tip thereof, and a pair of squeezing rolls 123 and rubber rolls 124, and a plurality of rolls And the thickness is measured by an X-ray thickness meter 126. Thereafter, when it is confirmed that the base film 111 has a predetermined thickness, the corona treatment device 128 performs corona treatment on one surface thereof and transports it to the adhesive layer lamination zone 136.

On the other hand, in the adhesive layer lamination zone 136, the hot melt adhesive melted by the hot melt applicator 131 is extruded in a layered manner onto the release paper 113 via the T die 132, conveyed, and extruded. The layer 112 is laminated on the base film 111 together with the release paper 113 by the press roll 133.
Then, it winds up with the winding roll 138, Furthermore, it cuts to predetermined size with the cutting device which is not shown in figure, and completes an emergency adhesive bandage.

For example, in the first manufacturing method, the production speed (conveying speed of the base film 111) can be set to 100 m / min or more.
In the first production method, the surface of the base film may be drawn or embossed in the base film forming zone 129.

Next, the manufacturing method (henceforth the 2nd manufacturing method) of a 2nd emergency adhesive bandage is demonstrated.
FIG. 3 is a schematic diagram for explaining the second manufacturing method.
The second manufacturing method is a method of manufacturing an emergency bandage by coextrusion molding, and can be performed by a manufacturing line (manufacturing apparatus) 200 as shown in FIG.

In the production line 200, first, m-LLDPE, c-LLDPE and LDPE are blended using a mixer (not shown) to prepare a resin composition (material composition) containing them, and this is used as an extruder. It is put into the extruder 220 through a hopper 221 provided in 220. At the same time, the hot melt adhesive is put into the hot melt applicator 230 through the hopper 231. At this time, the resin composition is melted and kneaded in the extruder 220, and the hot melt adhesive is melted in the hot melt applicator 230. The melted resin composition and hot-melt pressure-sensitive adhesive are mixed with the base film 211 and the pressure-sensitive adhesive layer 212 from the co-extrusion T-die 242 disposed at the front ends of the extruder 220 and the hot-melt applicator 230. Are coextruded into a laminated film.
Thereafter, the coextruded film is laminated with the release paper 213 separately conveyed via a pair of squeezing rolls 243 and rubber rolls 244, and conveyed via a cooling area 245 having a plurality of rolls. Further, the thickness is measured by an X-ray thickness meter 246. And when it is confirmed that the laminated body has a predetermined thickness, it is wound up by a winding roll 248, and then cut into a predetermined size by a cutting device (not shown) to complete an emergency bandage.

In the second manufacturing method, the production speed (extrusion speed) can be set to 100 m / min or more.
In the second manufacturing method, the surface of the base film may be squeezed or embossed while the laminate is being transported.

According to the said 1st and 2nd manufacturing method, the emergency adhesive bandage of this invention can be manufactured suitably.
On the other hand, the method for producing the emergency bandage of the present invention is not limited to the first or second production method, and may be produced by other methods.
Specifically, a pressure-sensitive adhesive layer made of a solvent-type or emulsion-type pressure-sensitive adhesive is formed on one side of a release paper in advance, and a base film is laminated on the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer is attached to the base film. Alternatively, it may be produced by a so-called transfer method in which the film is transferred.
By using these production methods, the emergency bandage of the present invention can be suitably produced.

EXAMPLES Hereinafter, although an Example is hung up and demonstrated in more detail about this invention, this invention is not limited only to these Examples.

Example 1
Evolue-P SP9040 (manufactured by Prime Polymer, MFR = 4.0 g / 10 min, melting point = 88 ° C., density = 0.890 g / cm ³ ), a linear low density polyethylene polymerized by a metallocene catalyst, Ziegler-Natta catalyst MORETEC 0258CN (manufactured by Prime Polymer, MFR = 2.1 g / 10 min, melting point = 123 ° C., density = 0.931 g / cm ³ ), and Novatec, which is a low-density polyethylene LD LC500 (manufactured by Nippon Polyethylene Co., Ltd., MFR = 4.3 g / 10 min, melting point = 107 ° C., density = 0.919 g / cm ³ ) and the weight ratio (m-LLDPE: c-LLDPE: LDPE) is 40:50:10 Dry blend so that a resin composition is prepared, and then T-die Extrusion molding was performed under the following conditions to produce a base film for emergency adhesive plaster having a thickness of 60 μm.
As extrusion molding conditions, the extruder temperature from resin supply to melting was 150 to 230 ° C. for each zone, the T die mold temperature was 230 to 250 ° C., and the processing speed was 10 to 120 m / min.

(Example 2)
A base film for an emergency bandage was produced in the same manner as in Example 1 except that the weight ratio of m-LLDPE, c-LLDPE and LDPE (m-LLDPE: c-LLDPE: LDPE) was changed to 30:60:10. .

(Example 3)
A base film for an emergency bandage was produced in the same manner as in Example 1 except that the weight ratio of m-LLDPE, c-LLDPE and LDPE (m-LLDPE: c-LLDPE: LDPE) was changed to 45:45:10. .

Example 4
T8150 (manufactured by Keiyo Polyethylene Co., Ltd., MFR = 1.4 g / 10 min, melting point = 135 ° C., density = 0.5 g with respect to 100 g of the resin composition prepared in Example 1 0.960 g / cm ³ ) was added to prepare an HDPE-containing resin composition, which was extruded under the same conditions as in Example 1 to produce a base film for emergency adhesive plaster having a thickness of 60 μm.

(Comparative Example 1)
Evolue-P SP9040 (manufactured by Prime Polymer Co., Ltd., MFR = 4.0 g / 10 min, melting point = 88 ° C., density = 0.890 g / cm ³ ), which is a linear low density polyethylene polymerized with a metallocene catalyst, Extrusion molding was performed under the same conditions to produce a base film for emergency adhesive plaster having a thickness of 60 μm.

(Comparative Example 2)
MORETEC 0258CN (manufactured by Prime Polymer Co., Ltd., MFR = 2.1 g / 10 min, melting point = 123 ° C., density = 0.931 g / cm ³ ), which is a linear low density polyethylene polymerized with a Ziegler-Natta catalyst Extrusion molding was performed under the same conditions to produce a base film for emergency adhesive plaster having a thickness of 60 μm.

(Comparative Example 3)
Evolue-P SP9040 (manufactured by Prime Polymer, MFR = 4.0 g / 10 min, melting point = 88 ° C., density = 0.890 g / cm ³ ), which is a linear low-density polyethylene polymerized by a metallocene catalyst, and low density Polyethylene Novatec LD LC500 (manufactured by Nippon Polyethylene MFR = 4.3 g / 10 min, melting point = 107 ° C., density = 0.919 g / cm ³ ) so that the weight ratio (m-LLDPE: LDPE) is 40:60. Then, a resin composition was prepared by dry blending, and then extrusion molding was performed with a T-die under the same conditions as in Example 1 to produce a base film for emergency adhesive plaster having a thickness of 60 μm.

(Comparative Example 4)
A base film for emergency adhesive plaster was produced in the same manner as in Example 1 except that the weight ratio of m-LLDPE, c-LLDPE and LDPE (m-LLDPE: c-LLDPE: LDPE) was changed to 70:20:10. .

(Comparative Example 5)
A base film for emergency adhesive plaster was produced in the same manner as in Example 1 except that the weight ratio of m-LLDPE, c-LLDPE and LDPE (m-LLDPE: c-LLDPE: LDPE) was changed to 20: 75: 5. .

(Evaluation)
The following evaluation was performed about the base film for emergency adhesive bandages manufactured in Examples 1-4 and Comparative Examples 1-5. The results are shown in Table 1.
(1) 10% modulus and 50% modulus The base film for emergency adhesive plaster produced in Examples and Comparative Examples was cut into 19 mm × 180 mm to obtain measurement samples.
The measurement sample was pulled at an automatic recording type tensile tester in an atmosphere of 23 ° C. with a sample size width of 19 mm, a chuck interval of 50 mm, and a tensile speed of 300 mm / min, and 10% modulus and 50% modulus were measured. The results are shown in Table 1.
Here, the tensile direction of the sample was the width direction during extrusion (direction perpendicular to the extrusion direction).

(2) Maximum strength and maximum elongation The base film for emergency adhesive bandage manufactured in Examples and Comparative Examples was cut into 19 mm × 180 mm to obtain a measurement sample.
This measurement sample was pulled at a sample size width of 19 mm, a chuck interval of 50 mm, and a tensile speed of 300 mm / min, and the maximum strength and elongation were measured under an atmosphere of 23 ° C. in an automatic recording type tensile tester. At this time, the tensile direction of the sample was the width direction during extrusion (direction perpendicular to the extrusion direction). The results are shown in Table 1.
Here, the maximum strength is basically the strength when the measurement sample is pulled and broken. However, in the case where the film did not break after being elongated by 1000%, the strength at the time of elongation by 1000% was defined as the breaking strength.
The maximum elongation is basically the elongation when the measurement sample is pulled and broken. However, when the sample did not break after being elongated by 1000%, the measurement was terminated at that point, and the result was 1000% or more.
(3) The total light transmittance haze meter (Nippon Denshoku Industries Co., Ltd. make, NDH5000) was used, and the total light transmittance (%) was measured based on JISK7361-1.

(Example 5)
An emergency bandage was produced by a method according to the first production method shown in FIG.
That is, Evolue-P SP9040 (manufactured by Prime Polymer Co., Ltd.), which is a linear low density polyethylene polymerized by a metallocene catalyst, MORETEC 0258CN (manufactured by Prime Polymer Co., Ltd.), a linear low density polyethylene polymerized by a Ziegler-Natta catalyst, And, after dry blending Novatec LD LC500 (manufactured by Nippon Polyethylene Co., Ltd.) which is a low density polyethylene so that the weight ratio (m-LLDPE: c-LLDPE: LDPE) is 40:50:10, The base film for emergency adhesive bandage was extruded by T-die 122, and further conveyed through various rolls to form a base film 111 having a thickness of 60 μm. The extrusion conditions are the same as in Example 1.
Along with this, a hot melt adhesive (APS-801 (manufactured by Toa Gosei Co., Ltd.) / Softening point 122 ° C., melt viscosity 38300 m · Pa · s / 160 ° C.) containing an acrylic polymer as a main component is used with a hot melt applicator 131. By melting and extruding through a T-die 132, a pressure-sensitive adhesive layer 112 having a thickness of 30 μm is formed on the release paper 113, which is laminated on the base film 111, cut to 19 × 180 mm, and an emergency adhesive plaster and did. The extrusion molding conditions are as follows.
Processing speed: 100 m / min
T die temperature: 160-180 ° C
Hot melt applicator temperature: 160-180 ° C

(Example 6)
An emergency bandage was produced in the same manner as in Example 5 except that the weight ratio of m-LLDPE, c-LLDPE and LDPE (m-LLDPE: c-LLDPE: LDPE) was changed to 30:60:10.

(Example 7)
An emergency bandage was produced in the same manner as in Example 5 except that the weight ratio of m-LLDPE, c-LLDPE and LDPE (m-LLDPE: c-LLDPE: LDPE) was changed to 45:45:10.

(Example 8)
T8150 (manufactured by Keiyo Polyethylene Co., Ltd.), which is high-density polyethylene (HDPE), was added at a ratio of 0.5 parts by weight to 100 parts by weight of the total amount of m-LLDPE, c-LLDPE and LDPE, and dry blended. Produced an emergency bandage in the same manner as in Example 5.

(Comparative Example 6)
Implemented except that only Evolue-P SP9040 (manufactured by Prime Polymer Co., Ltd.), which is a linear low density polyethylene polymerized with a metallocene catalyst, was added to the mixer instead of the blend of m-LLDPE, c-LLDPE and LDPE. In the same manner as in Example 5, an emergency bandage was obtained.

(Comparative Example 7)
Implemented except that only MORETEC 0258CN (manufactured by Prime Polymer Co., Ltd.), a linear low density polyethylene polymerized by Ziegler-Natta catalyst, was used instead of the blend of m-LLDPE, c-LLDPE and LDPE. In the same manner as in Example 5, an emergency bandage was obtained.

(Comparative Example 8)
Instead of a dry blend of m-LLDPE, c-LLDPE and LDPE, Evolue-P SP9040 (manufactured by Prime Polymer), which is a linear low density polyethylene polymerized by a metallocene catalyst, and Novatec LD LC500, which is a low density polyethylene An emergency adhesive bandage was obtained in the same manner as in Example 5 except that dry blending was performed so that the ratio was 40:60 (manufactured by Nippon Polyethylene).

(Comparative Example 9)
An emergency bandage was produced in the same manner as in Example 5 except that the weight ratio of m-LLDPE, c-LLDPE and LDPE (m-LLDPE: c-LLDPE: LDPE) was changed to 70:20:10.

(Comparative Example 10)
An emergency bandage was produced in the same manner as in Example 5 except that the weight ratio of m-LLDPE, c-LLDPE and LDPE (m-LLDPE: c-LLDPE: LDPE) was changed to 20: 75: 5.

(Evaluation)
The following evaluation was performed about the emergency adhesive bandage manufactured in Examples 5-8 and Comparative Examples 6-10. The results are shown in Table 2.
(1) Film processability The processability was evaluated according to the following criteria for neck-in, surging and resonance.
(1-1) Neck-in ◯: The width should not be reduced by 10% or more at both ends with respect to the discharge width of the T-die.
(The neck-in width is 100 mm or less with respect to the discharge width of the T die of 1000 mm)
X: The width should be reduced by 50% or more.

(1-2) Surging ◯: The thickness in the flow direction and the width direction is a tolerance of 5 μm or less with respect to the standard center value. X: The tolerance in the flow direction or the width direction exceeds 5 μm.

(1-3) Resonance ○: The film edge is parallel and is not rattling.
×: Beyond the above ○ level

(2) Evaluation of feeling of use In the evaluation of feeling of use, the number of subjects was 10 (n = 10), and an emergency bandage was actually used and evaluated according to the following criteria. The results are shown in Table 2.
(2-1) Ease of sticking to the skin When the release paper is peeled off to determine whether the release paper can be peeled off from the emergency sticking plaster and applied to the skin smoothly, curling occurs in the emergency sticking plaster Focusing on whether or not the first-aid adhesive bandage sticks to each other, the following criteria were used for evaluation.
The place where the emergency bandage was applied was the middle finger of the hand opposite to the dominant hand.
(Evaluation criteria)
○: Attaching the emergency bandage smoothly.
Δ: Some curling was confirmed when the release paper was peeled off, but the curling did not affect the pasting operation.
X: When the release paper was peeled off, curling occurred and / or the films adhered to each other, so that it was not possible to smoothly apply the emergency adhesive bandage.

(2-2) Ease of peeling from the skin The following criteria evaluated whether or not the first adhesive bandage stuck on the middle finger of the hand opposite to the dominant hand could be removed smoothly.
(Evaluation criteria)
○: The emergency bandage can be peeled off smoothly.
(Triangle | delta): When peeling an emergency adhesive bandage, although it expands somewhat, it can peel without fracture | rupture.
X: The emergency adhesive bandage breaks, or the emergency adhesive bandage does not break, but it extends greatly and cannot be peeled off smoothly. In addition, in the table | surface, that was written together about what was fractured.

(2-3) After applying an emergency bandage so as to cover the joint of the middle finger of the hand opposite to the dominant hand following the skin. Whether the emergency bandage followed the flexion of the joint was evaluated according to the following criteria.
(Evaluation criteria)
○: The emergency bandage follows the skin, and no floating occurs between the skin and the emergency bandage.
(Triangle | delta): Although slight floating generate | occur | produces between skin and emergency adhesive bandage, it does not become a problem at the time of actual use.
X: A float occurs between the skin and the first-aid adhesive bandage, and it cannot be appropriately used as the first-aid bandage.

From the results shown in Tables 1 and 2, the base film for emergency bandage comprising a resin composition containing two types of linear low density polyethylene (m-LLDPE and c-LLDPE) together with low density polyethylene (LDPE). It was revealed that the first-aid adhesive bandage did not break when peeled, had a good texture, and was easy to apply.
Moreover, it became clear that the said base film for emergency adhesive bandages can be suitably produced with an extrusion method.

DESCRIPTION OF SYMBOLS 10 Emergency adhesive bandage 11 Base film 12 for emergency adhesive bandages Adhesive layer 13 Release paper

Claims (6)

Contains linear low density polyethylene (m-LLDPE) polymerized using metallocene catalyst, linear low density polyethylene (c-LLDPE) and low density polyethylene (LDPE) polymerized using Ziegler-Natta catalyst A resin composition
The linear low density polyethylene polymerized using the metallocene catalyst has a density of 0.88 to 0.91 g / cm ³ ,
The linear low density polyethylene polymerized using the Ziegler-Natta catalyst has a density of 0.91 to 0.94 g / cm ³ ,
The low density polyethylene has a density of 0.91 to 0.94 g / cm ³ ,
Weight ratio of linear low density polyethylene polymerized using the metallocene catalyst, linear low density polyethylene polymerized using the Ziegler-Natta catalyst, and the low density polyethylene (m-LLDPE: c -LLDPE: LDPE) is 30-45: 45-65: bandage base material film comprising it is 5-15. The base film for an emergency bandage according to claim 1, which has a thickness of 20 to 100 µm. The base film for an emergency bandage according to claim 1 or 2, wherein the total light transmittance is 85% or more. The said resin composition is a base film for emergency adhesive bandages in any one of Claims 1-3 which contain a high density polyethylene (HDPE) further. The said resin composition is a base film for emergency adhesive bandages in any one of Claims 1-4 which contain only polyethylene as a resin component. An emergency adhesive bandage comprising an adhesive layer laminated on one side of the base film for emergency adhesive bandage according to any one of claims 1 to 5.

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