JP6695734B2 - Infection prevention film - Google Patents

Description

  The present invention relates to an infection control film.

  A dedicated keyboard cover has been proposed to protect the computer keyboard from water and dust, and to prevent malfunctions. For example, Patent Document 1 proposes a keyboard cover having an adhesive elastomer film at a portion in contact with the keyboard. This keyboard cover can prevent displacement from the keyboard due to its adhesive property and can prevent deformation of the cover due to displacement. Further, for example, Patent Document 2 proposes a silicone elastomer sheet having a specific surface roughness, thickness, and rubber hardness, which prevents displacement without an adhesive and provides a good feel of a finger at the time of key touch and a feeling of typing. It improves and is easy to peel off.

  In addition, since a personal computer such as an electronic medical chart is shared by a plurality of medical personnel in a medical field, there is a concern about cross infection, and it is required to maintain hygiene. On the other hand, for example, Patent Document 3 proposes a keyboard cover formed of a resin containing an antibacterial agent.

Registered utility model No. 3032087 Patent No. 4728068 JP, 2006-330954, A

  However, in the prior art, when repeatedly key-touching, durability is insufficient, the cover partially extends and it is easy to get caught at the corner of the key and is easily torn. Infection environment has not achieved the purpose of infection prevention.

  Therefore, the present invention, for example, when used as a keyboard cover, has sufficient durability even when repeatedly key-touched, is difficult to stretch, and can be prevented from being caught in a corner portion of the key and is hard to be broken, and particularly in a medical field. It is an object of the present invention to provide an infection-prevention film that can achieve the purpose of infection prevention in a use environment in which medical personnel are indirectly contacted.

  As a result of earnest studies, the present inventors have found that the 2% strain elastic modulus in the flow direction (MD direction) and the 2% strain elastic modulus in the width direction (TD direction), and the flow direction (MD direction) and the width direction ( The present invention has been completed by finding that the above-mentioned problems can be solved by an infection prevention film having a base film having a tensile elongation in the TD direction) within a specific range.

  That is, the present invention is as follows.

[1]
The 2% strain elastic modulus in the flow direction (MD direction) and the 2% strain elastic modulus in the width direction (TD direction) are 190 to 600 MPa, and the tensile elongation in the flow direction (MD direction) and the width direction (TD direction) is 60 to. An infection control film having a base film satisfying 200%.
[2]
The infection-preventing film according to [1], further comprising an adhesive layer, wherein the adhesive layer has an adhesive force (JIS 0237-compliant 180 degree peeling force) of 0.01 to 1.5 N / 25 mm.
[3]
The infection preventive film according to [2], wherein the Haze of the layer including the base film and the adhesive layer is 0.1 to 25.
[4]
The infection prevention film according to any one of [1] to [3], which has a density of 0.9 to 1.9 g / cm ³ and a thickness of the base film of 5 to 50 μm.
[5]
The infection-preventing film according to any one of [1] to [4], which has a heat shrinkage rate of 20 to 45% at 120 ° C.
[6]
The infection prevention film according to any one of [1] to [5], wherein the main component of the base film is a vinylidene chloride copolymer.
[7]
The infection prevention film according to [2] or [3], which has a separator on the adhesive layer side of the layer including the base film and the adhesive layer.
[8]
An infection prevention film roll comprising a core tube and the infection prevention film according to any one of [1] to [7] wound on the core tube.
[9]
The infection-preventing film roll according to [8], wherein the withdrawal force for pulling out the infection-preventing film from the core tube is 30 to 300 cN / 200 mm width.
[10]
An infection-prevention film storage box, which is a box that stores the infection-prevention film roll according to [8] or [9], including means for pulling out the infection-prevention film from the core tube.
[11]
An infection prevention film storage box comprising the infection prevention film roll according to [8] or [9], which is provided with a means for cutting the infection prevention film pulled out from the core tube.

  The infection-preventing film of the present invention, for example, when used as a keyboard cover, has sufficient durability even when repeatedly key-touched and is difficult to stretch and can be prevented from being caught at the corners of the key and is not easily torn. Therefore, the purpose of infection prevention can be achieved in a use environment where multiple medical personnel are in indirect contact.

  Hereinafter, a mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail. The following embodiments are examples for explaining the present invention, and are not intended to limit the present invention only to the present embodiments. The present invention can be appropriately modified and implemented within the scope of the gist.

<Infection prevention film>
The infection prevention film is used in various inspection equipment such as electronic medical chart keyboards and operation panels that multiple medical personnel come into contact with in hospitals to prevent the attachment of bacteria and viruses, blood and vomiting, and the attachment of other body fluids. It is a film that prevents cross-infection between medical personnel.

  In the infection-preventing film of the present embodiment, the 2% strain elastic modulus in the flow direction (MD direction) and the 2% strain elastic modulus in the width direction (TD direction) are 190 to 600 MPa, and the flow direction (MD direction) and the width direction ( The base film has a tensile elongation in the TD direction of 60 to 200%. The infection-preventing film of the present embodiment has such a base film, and thus, when used as a keyboard cover, for example, is resistant to tearing because the film is difficult to stretch even when repeatedly key-touched, and is suitable for infection prevention. ..

  The base film used in this embodiment has a 2% strain elastic modulus in the flow direction (MD direction) of preferably 190 to 550 MPa, more preferably 200 to 500 MPa, and more preferably 200 to 400 MPa. More preferable. The base film used in this embodiment has a 2% strain elastic modulus in the width direction (TD direction) of preferably 190 to 550 MPa, more preferably 200 to 500 MPa, and more preferably 200 to 400 MPa. Is more preferable. Further, the base film used in the present embodiment has a tensile elongation in the machine direction (MD direction) of preferably 60 to 180%, more preferably 65 to 170%, and even more preferably 70 to 165%. Is more preferable. Furthermore, the base film used in the present embodiment has a tensile elongation in the width direction (TD direction) of preferably 60 to 180%, more preferably 65 to 170%, and 70 to 165%. It is more preferable that there is.

  When the base film having such characteristics is used, the infection-preventing film of the present embodiment tends to be more resistant to breakage and torn even when repeatedly key-touched when used as a keyboard cover, for example. .. Further, since it is also difficult for the corners of various devices to stretch and break, it can be used to protect the devices. Various equipment has all corners such as office multifunction machines, retail cash registers and weighing machines in backyards, switches and operation panels for inspection equipment such as MRI and CT in hospitals, electronic medical record wagons, and stretchers. Equipment.

  Furthermore, the infection-preventing film of this embodiment has a density within the range to be described later, and it has elasticity and becomes easier to handle without being entangled with each other during sticking.

  The method of controlling the 2% strain elastic modulus and the tensile elongation of the base film within the above ranges is not particularly limited, but for example, a step of extruding a resin and a plasticizer as a single layer or a multi-layer original fabric from an annular die, and extruding An example of the method may include a step of cooling and solidifying the raw material that has been cooled and a step of stretching the raw material that has been cooled and solidified.

  Further, the base film is preferably stretched. The stretching treatment step is a known step in which the original film is stretched uniaxially or biaxially. The stretching method is not limited, and preferably biaxial stretching, more preferably sequential or simultaneous biaxial stretching method or inflation biaxial stretching method can be adopted, and among these, inflation biaxial stretching method is preferable.

  In this embodiment, the 2% strain elastic modulus and the tensile elongation of the base film can be measured by the methods described in Examples below.

  The infection prevention film of the present embodiment preferably further comprises an adhesive layer. The adhesive strength (180 ° peel strength according to JIS0237) of the adhesive layer is preferably 0.01 to 1.5 N / 25 mm, more preferably 0.03 to 1.2 N / 25 mm, and 0. More preferably, it is 0.05 to 1.0 N / 25 mm. By further including such an adhesive layer, the infection prevention film of the present embodiment has an effect that, for example, when used as a keyboard cover, it firmly adheres to the keyboard and is easily peeled off when it is peeled off. In addition, when the base film having the above-mentioned characteristics and elasticity is subjected to a slight adhesive processing with the adhesive layer, the films are not entangled with each other when the films are attached, and the films can be easily handled.

  The method for controlling the adhesive strength of the adhesive layer within the above range is not particularly limited, and examples thereof include a method of adjusting the hardness of the adhesive and the thickness of the adhesive layer.

  In addition, in this embodiment, the adhesive force of the adhesive layer is a 180-degree peel force obtained by a measuring method in accordance with JIS0237.

  The pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is not particularly limited, and examples thereof include acrylic pressure-sensitive adhesives, rubber pressure-sensitive adhesives, silicone pressure-sensitive adhesives, urethane pressure-sensitive adhesives, and among them, acrylic pressure-sensitive adhesives, rubber pressure-sensitive adhesives. Agents are preferable, and acrylic adhesives are particularly preferable.

  In acrylic adhesives, comonomers are added to the main monomer to adjust cohesive strength, or functional group-containing monomers are added to provide cross-linking points to adjust the hardness of the adhesive and develop the desired adhesive strength. be able to. The main monomer is not particularly limited, and examples thereof include various alkyl (meth) acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate. These can be used alone or in combination. The comonomer is not particularly limited, and examples thereof include vinyl acetate, acrylonitrile, acrylamide, styrene, methyl methacrylate, and methyl acrylate. The functional group-containing monomer is not particularly limited, but examples thereof include acrylic acid, hydroxyethyl acrylate, acrylamide, and glycidyl methacrylate. Further, tacky fire such as rosin, terpenes, aliphatic and aromatic synthetic resins can be added to adjust the adhesive strength. In addition to the stabilizer, a stabilizer, an antioxidant, a light stabilizer, an ultraviolet absorber agent, etc. may be added.

  Having an adhesive layer formed from the adhesive as described above, the infection-preventing film of the present embodiment, for example, when used as a keyboard cover, firmly adheres to the keyboard, when peeled, the effect of easily peeling off. Express even more. In addition, the film becomes easier to handle without being entangled.

  Further, the thickness of the adhesive layer is preferably 0.5 to 20 μm, more preferably 1.0 to 17 μm, and further preferably 3 to 15 μm from the viewpoint of the adhesive strength of the adhesive layer. When the thickness of the pressure-sensitive adhesive layer is within the above range, the infection-preventing film of the present embodiment further exhibits the effect of firmly adhering to the keyboard when used as a keyboard cover and easily peeled off when peeled off. In addition, the film becomes easier to handle without being entangled.

  In addition, in the infection-preventing film of the present embodiment, Haze of the layer including the base film and the adhesive layer is preferably 0.1 to 25, more preferably 0.1 to 15, and 0.1 More preferably, it is 7 to 7. When the Haze of the layer including the base film and the adhesive layer is within the above range, the infection-preventing film of the present embodiment has an effect that the covered article has transparency that allows the covered article to be visually recognized.

  The method for controlling the Haze of the layer including the base film and the pressure-sensitive adhesive layer within the above range is not particularly limited, and examples thereof include components constituting the base film and / or the pressure-sensitive adhesive layer, and a plate at the time of coating the pressure-sensitive adhesive. And a method of appropriately selecting the smoothness of the release paper and the film.

  In the present embodiment, the Haze of the layer including the base film and the adhesive layer can be measured by the method described in Examples below.

The density of the infection film of this embodiment is preferably 0.9~1.9g / cm ^3, more preferably 1.2~1.9g / cm ^3, 1.5~ More preferably, it is 1.8 g / cm ³ . When the density is within the above range, the infection-preventing film of the present embodiment has elasticity, and therefore, the films are not easily entangled with each other during sticking, which makes the film easier to handle.

  The method for controlling the density of the infection-preventing film of the present embodiment within the above range is not particularly limited, and examples thereof include a method of appropriately selecting the components constituting the base film. Further, two or more kinds of resins may be combined or a filler may be used.

  In this embodiment, the density of the film can be measured by the method described in Examples below.

  Further, the thickness of the base film is preferably 5 to 50 μm, more preferably 10 to 40 μm, and further preferably 15 to 30 μm. When the thickness of the base film is in the above range, the infection-preventing film of the present embodiment is excellent in durability, so that the film is further prevented from being broken, and the infection-preventing film can be further prevented particularly when used in the medical field.

  The heat shrinkage rate of the infection prevention film of the present embodiment at 120 ° C. is preferably 20 to 45%, more preferably 25 to 40%. The infection-preventing film of the present embodiment has excellent durability when the heat shrinkage ratio at 120 ° C. is in the above range. For example, when used as a keyboard cover, it is difficult to stretch even when repeatedly key-touched, and the corners of the keys are difficult to stretch. It is possible to further prevent the material from being caught in the part and to prevent it from being torn, and it is possible to further prevent infection particularly when used in the medical field. Further, in the infection prevention of the present embodiment, when the heat shrinkage rate at 120 ° C. is within the above range, there is elasticity, and therefore the films are not easily entangled with each other during sticking, which makes it easier to handle.

  The method for controlling the heat shrinkage rate at 120 ° C. of the infection prevention film of the present embodiment within the above range is not particularly limited, but for example, a base film stretched by a method including the above stretching treatment step is used. Can be mentioned.

  In the present embodiment, the heat shrinkage rate of the substrate film at 120 ° C can be measured by the method described in Examples below.

  The critical surface tension of the substrate film determined by Zisman plot at 20 ° C. is preferably 35 to 50 mN / m, and more preferably 38 to 42 mN / m. When the critical surface tension of the base film at 20 ° C. determined by Zisman plot is in the above range, the pressure-sensitive adhesive can be easily applied.

  The method for controlling the critical surface tension of the substrate film determined by Zisman plot at 20 ° C. within the above range is not particularly limited, but examples thereof include a method of controlling mainly by adjusting the resin material or the plasticizer and the addition amount. Be done.

  In this embodiment, the critical surface tension of the base film at 20 ° C. can be determined by Zisman plot.

  The component constituting the base film is not particularly limited, and examples thereof include polyolefins such as polyvinylidene chloride, polyethylene and polypropylene, polyesters such as polyethylene terephthalate, ethylene / vinyl alcohol copolymer, ethylene / vinyl acetate copolymer. A polymer, polyamide, polyurethane or the like can be applied as the material. Among them, polyvinylidene chloride and electron beam crosslinked polyethylene are preferable, and polyvinylidene chloride is more preferable. Poly (vinylidene chloride) is a mixture of vinylidene chloride copolymer (100 parts by weight) satisfying a weight average molecular weight of 70,000 to 140,000 and vinylidene chloride monomer units of 75 to 96% by mass, and a mixture of fatty acid esters and an epoxidized compound. It is preferable to include a mass part.

  The components constituting the base film may be used alone or in combination of two or more.

  It is particularly preferable that the main component of the base film is a vinylidene chloride copolymer.

  In addition, in this embodiment, the main component means a component of 70% by mass or more, preferably 75% by mass or more, more preferably 85% by mass or more, further preferably 90%, when all the components are 100% by mass. It is not less than mass%, particularly preferably 100 mass%.

  The infection prevention film of the present embodiment may further include a release layer on the back surface of the base film. The infection-preventing film of this embodiment tends to be unwound easily when it includes a release layer.

  Although the release layer is not particularly limited, for example, a silicone type or a long chain alkyl pendant polymer type can be used.

  Further, the thickness of the release layer is preferably 0.1 to 1.0 μm, more preferably 0.15 to 0.9 μm, and further preferably 0.2 to 0.7 μm.

  Furthermore, the infection prevention film of this embodiment may be provided with a printing layer or a primer layer.

  The infection prevention film of the present embodiment may further have a separator on the adhesive layer side of the layer including the base film and the adhesive layer. The separator is not particularly limited, but, for example, a polyethylene terephthalate (PET) film or paper which has been made to exhibit releasability by a silicone treatment can be used.

<Method of manufacturing infection prevention film>
The method for producing the infection-preventing film of this embodiment is not particularly limited as long as it has a base film having a 2% strain elastic modulus and a tensile elongation satisfying the above-mentioned ranges. Further, the substrate film having the 2% strain elastic modulus and the tensile elongation satisfying the above-mentioned ranges has, for example, a step of extruding a resin and a plasticizer as a single-layer or multi-layer original fabric from an annular die, and cooling the extruded raw fabric. A method comprising a solidifying step and a step of stretching the cooled and solidified raw material may be mentioned.

  The stretching treatment step is a known step in which the original film is stretched uniaxially or biaxially. The stretching method is not limited, and preferably biaxial stretching, more preferably sequential or simultaneous biaxial stretching method or inflation biaxial stretching method can be adopted, and among these, inflation biaxial stretching method is preferable.

  The infection-preventing film of the present embodiment can be obtained by, for example, applying a pressure-sensitive adhesive to a substrate film obtained as described above with a comma coater or a gravure coater, winding after drying, and aging at 40 ° C. for 2 days. it can. At that time, a method may be used in which a pressure-sensitive adhesive is applied to the separator, dried, and then the base film is laminated. Before applying the pressure-sensitive adhesive, a primer having an affinity for the pressure-sensitive adhesive layer and the base material layer may be applied in advance, or the base material film may be subjected to corona treatment. Further, the back surface treatment may be performed on the base material before and after the adhesive coating.

<Infection prevention film roll>
The infection-preventing film wound body of the present embodiment includes a core tube and the infection-preventing film wound on the core tube.

  The material of the core tube is not limited, and, for example, paper, plastic, metal or the like can be used. The core tube may be a hollow cylinder or a solid cylinder. The diameter of the core tube is not limited and can be set to 10 mm to 50 mm, for example.

  In the infection-preventing film wound body of the present embodiment, the pulling force for pulling out the infection-preventing film from the core tube is preferably 30 to 300 cN / 200 mm width, more preferably 35 to 250 cN / 200 mm width, More preferably, the width is 40 to 200 cN / 200 mm. By setting the pull-out force within the above range, the required amount of infection-preventing film can be pulled out with a light force.

  The method for controlling the withdrawal force of pulling out the infection prevention film from the core tube is not particularly limited, but for example, in addition to setting the adhesive strength of the infection prevention film, a release layer is provided on the back surface of the infection prevention film. It can be mentioned.

  In this embodiment, the pulling force for pulling out the infection prevention film from the core tube can be measured by the method described in Examples below.

<Infection prevention film storage box>
The infection-prevention film storage box of the present embodiment is a box that stores the above-described infection-prevention film roll, and includes a unit for pulling out the infection-prevention film from the core tube. By providing a take-out port through which the wound body of the infection prevention film is drawn out, and having a structure in which the wound body can freely rotate in the storage box, a required amount of film can be drawn out.
Further, the infection-prevention film storage box of the present embodiment can be provided with a means for cutting the infection-prevention film pulled out from the core tube. This makes it possible to easily cut the required amount of the infection prevention film. As a cutting means, a slide cutter may be used in addition to a saw blade made of metal, paper, plastic, or the like.

  Next, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples unless it exceeds the gist.

  The measurement methods used in the examples and comparative examples were as follows.

(1) 2% Strain Modulus of Base Film Measured in accordance with ASTM-D882. That is, the base film of each example was cut into a sample having a width of 10 mm and a length of 100 mm along the MD and TD directions to obtain a sample, and the measurement was performed at a pulling speed of 5 mm / min. A tangent line was drawn on the obtained stress-strain graph to calculate a value in which the stress value at 2% elongation was converted into the thickness of the sample, and the average value of five measurements was taken as the measured value, and the MD direction and the TD direction were measured. The average value of 2 was defined as the value of 2% strain elastic modulus. Shimadzu Corporation AUTOGRAPH AG-IS was used as the measuring device.

(2) Tensile elongation of base film Measured according to ASTM-D882. That is, the base film of each example was cut into a sample having a width of 10 mm and a length of 100 mm along the MD and TD directions to obtain a sample, and the elongation at break was measured at a tensile speed of 300 mm / min. The average value of the times of measurement was taken as the measured value, and the average value in the MD and TD directions was taken as the value of tensile elongation. Shimadzu Corporation AUTOGRAPH AG-IS was used for the measurement.

(3) Adhesive Strength of Adhesive Layer The adhesive strength of the adhesive layer was measured as follows according to JIS Z0237. That is, the film was cut out into a sample having a width of 25 mm and a length of 300 mm along the MD direction to be a sample, which was attached to a SUS304 plate mirror finish by reciprocating twice at 10 mm / sec using a 2 kg weight roller. Tensile measurement was performed at a speed of 300 mm / min, and the average value of 5 times of peeling force was taken as the value of adhesive force. Shimadzu Corporation AUTOGRAPH AG-IS was used for the measurement. The 180-degree peel force thus obtained was taken as the adhesive force of the adhesive layer.

(4) Haze of a layer including a base film and an adhesive layer
It was measured according to JIS K7136, and the average value of 5 measurements was taken as the value of Haze.
Haze (%) = diffuse transmittance / total light transmittance × 100
A haze meter manufactured by Nippon Denshoku Industries Co., Ltd. was used for the measurement.

(5) Film Density Based on the methods for measuring the density and specific gravity of JIS K7112 plastics and non-foamed plastics, it was measured by the method A underwater displacement method.

(6) Thickness of Base Film The film was cut using a microtome, and the cut surface was observed with an optical microscope (VHX-900 manufactured by Keyence Corporation) to measure the thickness of the base film. This was further measured in the MD direction (unwinding direction) of the film every 1 m, and finally the average value of 10 points was taken as the thickness of the base film.

(7) Thermal shrinkage rate of the film at 120 ° C. The film was cut into a 10 cm square to prepare a sample, which was allowed to stand in an oven set at 120 ° C. for 1 minute, and then taken out, and the rate of change in the MD direction and the TD direction was measured. The average value of the times was used as the value of heat shrinkage.

(8) Critical Surface Tension of Base Film at 20 ° C. The critical surface tension of the base film at 20 ° C. was determined by Zisman plot as follows.
The contact angle for a liquid having a known surface tension used for Zisman plot was measured, and the surface tension was plotted on the x-axis and the cos θ of the contact angle was plotted on the y-axis. The value obtained by extrapolating the straight line obtained based on the above plot to cos θ = 1 was taken as the critical surface tension. As the liquid having a known surface tension, heptane and decane of n-alkanes, ethanol of alcohols, ethylene glycol, 1-chlorohexane and 1-chlorooctane of alkyl halides were used. A Kyowa Interface Science Co., Ltd. contact angle meter DM-501 was used for the measurement.

(9) Pull-out force of pulling out film from core tube A sample in which a film having a width of 200 mm was wound around a paper tube by 20 M was aged at 28 ° C. for 1 week. Acrylic cylinder and 12 mm diameter steel rod are connected to each other through a bearing and fitted into a rotatable fixture, the steel rod is fixed to a tensile tester, and the acrylic cylinder and the paper-wrapping film can be freely rotated. I chose The edge of the film is fixed to a plate with a width of 250 mm that is directly connected to the load cell of the tensile tester, and the load generated when the film is pulled out at a speed of 1000 mm / min is taken as the output force and the average value of 5 measurements is taken as the measured value. And For the measurement, a trade name “AUTOGRAPH AG-IS” (manufactured by Shimadzu Corporation) was used.

(10) Durability of infection-preventing film When the infection-preventing films obtained in Examples and Comparative Examples were used as a keyboard cover, repeated key touches were performed and random texts of 20,000 characters were typed and evaluated. In that case, the durability was evaluated as follows by catching and breaking the corner of the key.
<Durability evaluation criteria>
◯: There are less than 5 stretched parts.
Δ: Five or more stretched parts.
X: One or more places where part of the film is stretched and broken.

(11) Infection prevention film stiffness When the infection prevention films obtained in Examples and Comparative Examples were used as a keyboard cover, the film was unwound from the film roll and stuck to the keyboard 100 times. The entanglement was evaluated as follows.
◯: Twisted and failed to stick to the keyboard 5 times or less △: Tangled and stuck to the keyboard 6 to 19 times ×: Twisted and failed to stick to the keyboard 20 times or more

[Example 1]
[Production of base film]
A base film (PVDC film, thickness: 21 μm) containing a vinylidene chloride copolymer (PVDC) as a main component was produced as follows.
Vinylidene chloride-vinyl chloride copolymer (vinylidene chloride monomer unit content / vinyl chloride monomer unit content = 80 mass% / 20 mass%, weight average molecular weight 120,000, written as “PVDC” in Table 1 ) To 100 parts by mass, 3 parts by mass of dibutyl sebacate as a fatty acid ester, 3 parts by mass of acetyltributyl citrate, and 2 parts by mass of epoxidized soybean oil as an epoxidized compound are added and mixed with a Henschel mixer for 5 minutes. did. The obtained mixture was extruded into a tube with a melt extruder, supercooled in a cold water tank at about 10 ° C, and then passed through water at 35 ° C, a stretching temperature of 30 ° C, a length (MD) direction of 3.0 times, and a width (TD). The tubular film obtained by carrying out inflation biaxial stretching of 4.0 times in the) direction was folded by a pinch roll to produce a flat long film having a thickness of 42 μm. After that, a single film was peeled off using a slitter to obtain a 21 μm film. The characteristics of the obtained film (base film) were measured by the above methods. The measurement results are shown in Table 1.

[Manufacture of infection prevention film]
Acrylic adhesive (main agent: X-314 (100 parts by mass), curing agent: K-315 (1.5 parts by mass), manufactured by Saiden Chemical Co., Ltd.) is applied to a separator (silicone-treated polyethylene terephthalate (PET) film). An infection-preventing film was produced by coating with a comma coater to a thickness of 3.5 μm, laminating and winding the above-prepared base film, aging at 40 ° C. for 2 days, and delaminating the separator. .. The characteristics of the obtained infection prevention film were measured as described above. The measurement results are shown in Table 1.

  [Manufacture of infection prevention film roll] The infection prevention film roll produced by slitting the infection prevention film (width: 500 mm, length: 300 m) produced above into a width of 200 mm and winding it around a cylindrical core tube. Was manufactured. In the obtained infection-preventing film roll, the pulling force of the film from the core was 200 cN / 200 mm width.

[Examples 2 to 8 and Comparative Example 1]
An infection-preventing film was produced in the same manner as in Example 1 except that the thickness of the base film, the mass ratio of the main agent to the curing agent in the adhesive, the thickness of the adhesive layer, etc. were changed as shown in Table 1. A wound body was manufactured.

  The back surface treatment of the infection-preventing film was carried out by applying a long-chain alkyl pendant polymer (Pyrroyl manufactured by Lion Corporation) to a thickness of 0.2 μm using a gravure coater.

[Example 9]
LL (ethylene-1-octene copolymer density 0.926 g / cm ³ MI 2.0 g / 10 min): LD (high pressure method low density polyethylene 0.921 g / cm ³ MI 0.4 g / 10 min) = 70: 30 Polyethylene resin (composition) in which 0.5% by mass of glycerin monooleate was added was extruded from an annular die, and then cooled and solidified with cold water to obtain a tube-shaped original fabric having a folding width of 120 mm and a thickness of 500 μm. Was produced. This was guided to an electron beam irradiation device, irradiated with an electron beam accelerated to 500 kV, and subjected to crosslinking treatment so that the absorbed dose was 80 kGy. This is guided into a stretching machine to be reheated, passed between two pairs of differential nip rolls, bubbles are formed by air injection, and inflation biaxial stretching is performed under the stretching conditions of MD direction 8 times and TD direction 6 times. A double ply film was obtained. A single film was peeled off in the slit process to obtain a base film.

  An infection-preventing film was produced in the same manner as in Example 1 except that the obtained substrate film was used to produce an infection-preventing film roll. The characteristics of the obtained infection-preventing film and the wound roll for preventing infection were measured as described above. The measurement results are shown in Table 1.

[Example 10]
EVA (ethylene / vinyl acetate copolymer) / EVA, LL (ethylene-1-octene copolymer), VL (ultra low density polyethylene) / PP (polypropylene) / EVA, LL, VL / EVA having a five-layer structure Then, it was extruded from a circular multi-layered die heated to 220 ° C., quenched with cold water, and the inside of the laminate was coated with a sodium oleate aqueous solution and squeezed with a pinch roll to fold it to obtain a raw sheet having a thickness of 130 μm. Air was injected into the folded original fabric to form a tube, which was heated to 50 ° C., biaxially stretched 3.7 times in the longitudinal direction and 4.3 times in the lateral direction, and then taken up by a nip roll. Then, hot air at 65 ° C. was applied to this, and heat treatment was performed so that the target thickness of the final film was 10 μm, both ends of the film were cut, and two monoleaf films were wound up.

  An infection-preventing film was produced in the same manner as in Example 1 except that the obtained monofilament film was used as a substrate film, to produce an infection-preventing film roll. The characteristics of the obtained infection-preventing film and the wound roll for preventing infection were measured as described above. The measurement results are shown in Table 1.

[Comparative example 2]
LD (high-pressure method low-density polyethylene, density 0.921 g / cm3 MI 0.4 g / 10 min) was extruded into a cylinder by a melt extruder to form bubbles and wound up to prepare a base film.

  An infection-preventing film was produced in the same manner as in Example 1 except that the obtained substrate film was used to produce an infection-preventing film roll. The characteristics of the obtained infection-preventing film and the wound roll for preventing infection were measured as described above. The measurement results are shown in Table 1.

[Comparative Example 3]
6 Nylon was extruded by a melt extruder and biaxially stretched to obtain a base film having a thickness of 25 μm.

  An infection-preventing film was produced in the same manner as in Example 1 except that the obtained substrate film was used to produce an infection-preventing film roll. The characteristics of the obtained infection-preventing film and the wound roll for preventing infection were measured as described above. The measurement results are shown in Table 1.

[Comparative Example 4]
After kneading with a two-component silicone rubber, the mixture was allowed to stand overnight to prepare a sheet having a thickness of 0.1 mm to obtain a base film.

  An infection-preventing film was produced in the same manner as in Example 1 except that the obtained substrate film was used to produce an infection-preventing film roll. The characteristics of the obtained infection-preventing film and the wound roll for preventing infection were measured as described above. The measurement results are shown in Table 1.

Claims (11)

  The 2% strain elastic modulus in the flow direction (MD direction) and the 2% strain elastic modulus in the width direction (TD direction) are 190 to 600 MPa, and the tensile elongation in the flow direction (MD direction) and the width direction (TD direction) is 60 to. An infection control film having a base film satisfying 200%.   The infection-preventing film according to claim 1, further comprising an adhesive layer, wherein the adhesive force (180 ° peeling force according to JIS0237) of the adhesive layer is 0.01 to 1.5 N / 25 mm.   The infection-preventing film according to claim 2, wherein Haze of the layer including the base film and the adhesive layer is 0.1 to 25. The infection prevention film according to any one of claims 1 to ³ , wherein the density is 0.9 to 1.9 g / cm ³ , and the thickness of the base film is 5 to 50 µm.   The infection-preventing film according to any one of claims 1 to 4, wherein the heat shrinkage rate at 120 ° C is 20 to 45%.   The infection prevention film according to claim 1, wherein the main component of the base film is a vinylidene chloride copolymer.   The infection prevention film according to claim 2 or 3, which has a separator on the adhesive layer side of the layer including the base film and the adhesive layer.   An infection-preventing film roll comprising a core tube and the infection-preventing film according to any one of claims 1 to 7 wound around the core tube.   The infection-preventing film roll according to claim 8, wherein the withdrawal force for pulling out the infection-preventing film from the core tube is 30 to 300 cN / 200 mm width.   An infection-prevention film storage box, which is a box for storing the infection-prevention film winding body according to claim 8 or 9, further comprising means for pulling out the infection-prevention film from the core tube.   A box containing the infection-preventing film roll according to claim 8 or 9, wherein the infection-preventing film storage box is provided with a unit for cutting the infection-preventing film pulled out from the core tube.