WO2016167241A1 - Elastic porous film and article - Google Patents

Elastic porous film and article Download PDF

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Publication number
WO2016167241A1
WO2016167241A1 PCT/JP2016/061787 JP2016061787W WO2016167241A1 WO 2016167241 A1 WO2016167241 A1 WO 2016167241A1 JP 2016061787 W JP2016061787 W JP 2016061787W WO 2016167241 A1 WO2016167241 A1 WO 2016167241A1
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WO
WIPO (PCT)
Prior art keywords
porous film
stretchable porous
air permeability
film according
present
Prior art date
Application number
PCT/JP2016/061787
Other languages
French (fr)
Japanese (ja)
Inventor
安洋 武田
義武 重松
公平 武田
翔 内田
宗重 中川
生島　伸祐
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2015232629A external-priority patent/JP6726953B2/en
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN202310898756.1A priority Critical patent/CN116903958A/en
Priority to US15/564,090 priority patent/US10772984B2/en
Priority to EP16780032.5A priority patent/EP3296349B1/en
Priority to CN201680021971.1A priority patent/CN107428980A/en
Publication of WO2016167241A1 publication Critical patent/WO2016167241A1/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066—Use of inorganic compounding ingredients
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/08—Copolymers of ethene

Definitions

  • the present invention relates to a stretchable porous film and an article.
  • Various elastic films are used for elastic articles such as hygiene products such as adhesive bandages.
  • Such a stretchable film is required not only to have excellent stretchability but also to have excellent breathability depending on the application.
  • a conventional representative bandage (see, for example, Patent Document 1) uses polyvinyl chloride as a polymer component of the stretchable film that it has. There is a problem that a maceration phenomenon occurs in which the skin of the affixed portion is steamed and whitened while it is affixed to the abdomen.
  • the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a stretchable porous film having excellent stretchability and excellent breathability. Moreover, it is providing the articles
  • the stretchable porous film of the present invention is A stretchable porous film having voids on the surface,
  • the air permeability measured by the Oken air permeability meter is less than 99999 sec / 100 cc
  • the air permeability measured by the Oken air permeability meter in a state of 100% extension has an extension direction that is less than 60000 sec / 100 cc
  • the residual strain when the inter-chuck distance is removed is 10 mm or less.
  • the air permeability measured by the Oken air permeability meter is less than 60000 sec / 100 cc.
  • the air permeability measured by the Oken air permeability meter is less than 40000 sec / 100 cc.
  • the air permeability measured by the Oken air permeability meter in the 100% stretched state is less than 30000 sec / 100 cc.
  • the air permeability measured by the Oken air permeability meter in the 100% stretched state is less than 5000 sec / 100 cc.
  • the residual strain is 8 mm to 1 mm.
  • the residual strain is 6 mm to 2 mm.
  • the stretchable porous film of the present invention has a thickness of 30 ⁇ m to 300 ⁇ m.
  • the stretchable porous film of the present invention has a thickness of 50 ⁇ m to 150 ⁇ m.
  • the stretchable porous film of the present invention includes a polymer component and a filler.
  • the polymer component includes a propylene-based elastomer.
  • the content of the propylene-based elastomer in the polymer component is 30% by weight to 100% by weight.
  • the propylene-based elastomer has an MFR of 0.1 g / 10 min to 18 g / 10 min.
  • the propylene-based elastomer has an MFR of 2 g / 10 min to 5 g / 10 min.
  • the propylene elastomer is a metallocene elastomer.
  • the polymer component includes linear low density polyethylene.
  • the content of the linear low-density polyethylene in the polymer component is 5% by weight to 60% by weight.
  • the filler is at least one selected from inorganic particles and organic particles.
  • the article of the present invention includes the stretchable porous film of the present invention.
  • the article of the present invention has an adhesive layer.
  • a stretchable porous film having excellent stretchability and excellent breathability can be provided.
  • goods containing such a stretchable porous film can be provided.
  • FIG. 1 It is a schematic plan view of an example of the elastic porous film by one embodiment of the present invention. It is a schematic plan view of another example of the stretchable porous film according to one embodiment of the present invention. The figure showing the relationship between the stress and distortion of a hysteresis test at the time of measuring a residual distortion.
  • the stretchable porous film of the present invention is a stretchable porous film having voids on the surface.
  • the stretchable porous film of the present invention has excellent air permeability by having voids on the surface.
  • the stretchable porous film of the present invention has an air permeability of less than 99999 sec / 100 cc, preferably less than 80000 sec / 100 cc, more preferably less than 70000 sec / 100 cc, as measured by the Oken air permeability meter. More preferably, it is less than 60000 sec / 100 cc, particularly preferably less than 50000 sec / 100 cc, and most preferably less than 40000 sec / 100 cc. If the air permeability measured by the Oken air permeability meter of the stretchable porous film of the present invention is within the above range, the stretchable porous film of the present invention can have excellent air permeability. .
  • the stretchable porous film of the present invention has an extension direction in which the air permeability measured by the Oken air permeability meter in a state of 100% extension is less than 60000 sec / 100 cc.
  • This air permeability is preferably less than 50000 sec / 100 cc, more preferably less than 40000 sec / 100 cc, still more preferably less than 30000 sec / 100 cc, particularly preferably less than 10000 sec / 100 cc, and most preferably 5000 sec / Less than 100cc.
  • the stretchable porous film of the present invention has an elongation direction in which the air permeability measured by the Oken type air permeability meter in a state of 100% elongation is in the above range, the stretchable porous film of the present invention.
  • the quality film can have excellent air permeability in the stretched state.
  • the stretchable porous film of the present invention may have at least one extension direction in which the air permeability falls within the above range.
  • an extension direction typically, when the stretchable porous film of the present invention is an unstretched film, all directions of the film are preferably exemplified. In the case of a uniaxially stretched film, a direction orthogonal to the direction of stretching (CD direction when stretched in the longitudinal (MD) direction) is preferably exemplified.
  • the stretchable porous film of the present invention is a biaxially stretched film, the air permeability is within the above range depending on various conditions such as simultaneous stretching or sequential stretching or a difference in biaxial stretching ratio.
  • the inner extension direction is determined.
  • the stretchable porous film of the present invention has a tensile strength of 20 mm and a distance between chucks of 30 mm to a distance between chucks of 60 mm at a tensile speed of 50 mm / min and is held for 1 minute in a hysteresis test.
  • the tensile strain is such that the residual strain is 10 mm or less.
  • This residual strain is preferably 9 mm to 1 mm, more preferably 8 mm to 1 mm, still more preferably 7 mm to 1 mm, particularly preferably 6 mm to 2 mm, and most preferably 5 mm to 3 mm. If the stretchable porous film of the present invention has a tensile direction in which the residual strain falls within the above range, the stretchable porous film of the present invention can have excellent stretchability.
  • the term “having a tensile direction” means that the stretchable porous film of the present invention only needs to have at least one tensile direction in which the residual strain falls within the above range.
  • a pulling direction typically, when the stretchable porous film of the present invention is an unstretched film, all directions of the film are preferably mentioned, and the stretchable porous film of the present invention is In the case of a uniaxially stretched film, a direction orthogonal to the direction of stretching (CD direction when stretched in the longitudinal (MD) direction) is preferably exemplified.
  • the stretchable porous film of the present invention is a biaxially stretched film, the residual strain is within the above range depending on various conditions such as simultaneous stretching or sequential stretching or a difference in biaxial stretching ratio. The pulling direction is determined.
  • the thickness of the stretchable porous film of the present invention is preferably 30 ⁇ m to 300 ⁇ m, more preferably 40 ⁇ m to 200 ⁇ m, still more preferably 50 ⁇ m to 150 ⁇ m, particularly preferably 60 ⁇ m to 140 ⁇ m, and most preferably. 70 ⁇ m to 120 ⁇ m. If the thickness of the stretchable porous film of the present invention is within the above range, the stretchable porous film of the present invention can have better stretchability and better breathability.
  • the stretchable porous film of the present invention preferably contains a polymer component and a filler.
  • FIG. 1 is a schematic plan view of an example of a stretchable porous film according to one embodiment of the present invention.
  • the stretchable porous film 100 includes a polymer component 10 and a filler 20.
  • FIG. 2 is a schematic plan view of another example of a stretchable porous film according to one embodiment of the present invention.
  • the stretchable porous film 100 includes a polymer component 10 and a filler 20, and further includes a void 30.
  • the stretchable porous film of the present invention is an embodiment as shown in FIG. 1, it can be an embodiment as shown in FIG. 2 by stretching. That is, when the stretchable porous film of the present invention is an embodiment as shown in FIG. 1, the stretchable porous film of the present invention can generate an appropriate void on the surface by stretching. Due to this appropriate gap, the stretchable porous film of the present invention can exhibit sufficient air permeability. Furthermore, it can also have waterproofness like a conventional typical bandage.
  • the presence of the filler causes the presence of an interface between the polymer component and the filler. Sex can be expressed.
  • the stretchable porous film of the present invention can adopt an embodiment as shown in FIG. 1 or an embodiment as shown in FIG. 2 according to the required performance of the part to be used.
  • any appropriate polymer component can be adopted as the polymer component as long as the effects of the present invention are not impaired.
  • the polymer component preferably contains a propylene-based elastomer.
  • the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, the stretchable porous film of this invention can express the more outstanding air permeability by combining with a filler because a polymer component contains a propylene-type elastomer.
  • propylene-based elastomer Only one type of propylene-based elastomer may be used, or two or more types may be used.
  • the stretchable porous film of the present invention contains a propylene-based elastomer
  • the thermal stability is improved, and for example, the thermal deterioration during the production of the stretchable porous film of the present invention can be suppressed.
  • the stretchable porous film of the present invention contains a propylene-based elastomer
  • storage stability is improved, and fluctuations in physical property values during storage of the stretchable porous film of the present invention can be suppressed.
  • the production process of the stretchable porous film of the present invention can be simplified and the processing cost can be suppressed by including the propylene-based elastomer in the stretchable porous film of the present invention. This is because when a propylene-based elastomer is employed, it is possible to perform extrusion molding when producing the stretchable porous film of the present invention, and it becomes unnecessary to produce a masterbatch.
  • the content of the propylene-based elastomer in the polymer component is preferably 30% by weight to 100% by weight, more preferably 40% by weight to 95% by weight, and still more preferably, from the viewpoint that the effects of the present invention are more manifested. Is 50% to 90% by weight, particularly preferably 55% to 85% by weight, and most preferably 60% to 80% by weight.
  • the stretchable porous film of the present invention can exhibit more excellent stretchability.
  • the stretchable porous film of this invention can express the more superior air permeability by combining with a filler.
  • propylene elastomer examples include propylene copolymer, propylene olefin block copolymer, propylene olefin random copolymer, propylene ethylene olefin block copolymer, and amorphous polypropylene.
  • the propylene-based elastomer its density, preferably 0.890g / cm 3 ⁇ 0.830g / cm 3, more preferably 0.888g / cm 3 ⁇ 0.835g / cm 3, more preferably 0.886 g / cm 3 to 0.835 g / cm 3 , particularly preferably 0.885 g / cm 3 to 0.840 g / cm 3 , and most preferably 0.885 g / cm 3 to 0.845 g / cm 3. 3 .
  • the density of the propylene-based elastomer is within the above range, the stretchable porous film of the present invention can exhibit more excellent stretchability.
  • the stretchable porous film of this invention can express the more outstanding air permeability by combining with a filler.
  • the propylene elastomer has an MFR at 230 ° C. of 2.16 kgf of preferably 0.1 g / 10 min to 18 g / 10 min, more preferably 0.5 g / 10 min to 15 g / 10 min. More preferably, it is 1.0 g / 10 min to 10 g / 10 min, particularly preferably 1.5 g / 10 min to 7 g / 10 min, and most preferably 2 g / 10 min to 5 g / 10 min.
  • the stretchable porous film of the present invention can exhibit more excellent stretchability.
  • the stretchable porous film of the present invention can exhibit better air permeability when combined with a filler.
  • Propylene elastomer can be obtained as a commercial product.
  • Commercially available products include, for example, some of “Tafmer” (registered trademark) series manufactured by Mitsui Chemicals, Inc., and “Vistamaxx” (registered trademark) series manufactured by ExxonMobil. Some (for example, Vistamax 7010) can be mentioned.
  • the propylene-based elastomer is preferably a metallocene-based elastomer (a propylene-based elastomer that is a metallocene-based elastomer may be referred to as a metallocene polypropylene-based elastomer).
  • the metallocene elastomer is an elastomer produced using a metallocene catalyst.
  • the polymer component preferably contains linear low density polyethylene.
  • the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, the stretchable porous film of this invention can express the more outstanding air permeability by combining with a filler because a polymer component contains a linear low density polyethylene with a propylene-type elastomer.
  • the linear low density polyethylene may be only one kind or two or more kinds.
  • the thermal stability is improved, for example, the thermal deterioration during the production of the stretchable porous film of the present invention is suppressed. Can do.
  • the stretchable porous film of the present invention contains linear low-density polyethylene together with the propylene-based elastomer, the storage stability is improved, and the physical property values during storage of the stretchable porous film of the present invention Fluctuations can be suppressed.
  • the stretchable porous film of the present invention contains linear low density polyethylene together with a propylene-based elastomer, whereby the production process of the stretchable porous film of the present invention can be simplified and processing costs can be suppressed. This is because when a linear low density polyethylene is used together with a propylene-based elastomer, it becomes possible to extrude when producing the stretchable porous film of the present invention, and there is no need to prepare a masterbatch. .
  • the content of the linear low density polyethylene in the polymer component is preferably 0% by weight to 70% by weight, more preferably 5% by weight to 60% by weight, from the viewpoint that the effect of the present invention is more manifested. More preferably, it is 10 to 50% by weight, particularly preferably 15 to 45% by weight, and most preferably 20 to 40% by weight. If the content rate of the linear low density polyethylene in a polymer component shall be in the said range, the stretchable porous film of this invention can express the more excellent stretchability. Moreover, if the content rate of the linear low density polyethylene in a polymer component shall be in the said range, the stretchable porous film of this invention can express the more outstanding air permeability by combining with a filler.
  • the linear low density polyethylene preferably has a density of 0.910 g / cm 3 to 0.940 g / cm 3 . If the density of the linear low-density polyethylene is within the above range, the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, if the density of linear low density polyethylene is made into the said range, the stretchable porous film of this invention can express the more outstanding air permeability by combining with a filler.
  • the MFR at 2.16 kgf at 230 ° C. is preferably 1 g / 10 min to 50 g / 10 min. If the MFR of the linear low density polyethylene is within the above range, the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, if the said MFR of linear low density polyethylene is made into the said range, the stretchable porous film of this invention can express the more excellent air permeability by combining with a filler.
  • Linear low density polyethylene can also be obtained as a commercial product.
  • Commercially available products include some of the “Ultzex” (registered trademark) series manufactured by Prime Polymer Co., Ltd.
  • the linear low density polyethylene is preferably a metallocene linear low density polyethylene.
  • the metallocene-based linear low density polyethylene is a linear low density polyethylene produced using a metallocene catalyst.
  • the stretchable porous film of the present invention preferably contains a filler.
  • the filler is preferably at least one selected from inorganic particles and organic particles. Only one type of filler may be used, or two or more types may be used. When the stretchable porous film of the present invention contains a filler, the stretchable porous film of the present invention can exhibit better air permeability.
  • examples of the inorganic particles include talc, titanium oxide, calcium oxide, magnesium oxide, zinc oxide, titanium oxide, calcium carbonate, silica, clay, mica, barium sulfate, whisker, and magnesium hydroxide.
  • organic particles examples include acrylic beads, styrene beads, and silicone resin particles.
  • the average particle diameter of the filler any appropriate average particle diameter can be adopted as long as the effects of the present invention are not impaired.
  • the average particle size of such a filler is preferably 0.5 ⁇ m to 50 ⁇ m.
  • Arbitrary appropriate content can be employ
  • the content of such a filler is preferably 50 to 400 parts by weight with respect to 100 parts by weight of the polymer component in the stretchable porous film.
  • the stretchable porous film of the present invention can exhibit better air permeability.
  • the filler may be coated with a release agent to prevent aggregation.
  • release agents include fatty acid amide release agents, silicone release agents, fluorine release agents, and long chain alkyl release agents.
  • a fatty acid amide release agent is preferable, and a saturated fatty acid bisamide is more preferable.
  • Arbitrary appropriate usage-amount can be employ
  • the stretchable porous film of the present invention may contain any appropriate other component as long as the effects of the present invention are not impaired. These may be only one kind or two or more kinds.
  • Such other components include, for example, ultraviolet absorbers, heat stabilizers, fillers, lubricants, colorants (dyes, etc.), antioxidants, anti-glare agents, antiblocking agents, foaming agents, and the like. Examples thereof include polymers, tackifiers, plasticizers, deterioration inhibitors, antistatic agents, and light stabilizers. These may be only one kind or two or more kinds.
  • the ultraviolet absorber examples include benzotriazole compounds, benzophenone compounds, benzoate compounds, and the like. Any appropriate content can be adopted as the content of the ultraviolet absorber as long as it does not bleed out during molding.
  • heat stabilizer examples include hindered amine compounds, phosphorus compounds, and cyanoacrylate compounds. Any appropriate content can be adopted as the content of the heat-resistant stabilizer as long as it does not bleed out during molding.
  • a method for producing the stretchable porous film of the present invention a method of producing by molding using a T-die molding machine is typical.
  • a roll body of a stretchable porous film can be produced by extruding the material of the stretchable porous film of the present invention from a T die using a T-die molding machine and then winding it into a roll. it can.
  • an inflation method or the like can be employed.
  • the stretchable porous film of the present invention may be obtained by stretching an unstretched film. Such stretching of an unstretched film may be referred to as pre-stretching.
  • the stretchable porous film of the present invention can exhibit more excellent stretchability when the unstretched film is stretched.
  • the stretchable porous film of the present invention is a film obtained by stretching an unstretched film, so that it can exhibit more excellent air permeability when combined with a filler.
  • Pre-stretching is pre-stretching in the sense that the stretchable porous film of the present invention is stretched in advance with respect to being stretched again in the final use (post-stretching).
  • the pre-stretching is preferably performed after the elastic porous film of the present invention is produced and sufficiently solidified.
  • the pre-stretching may be performed for the entire length or width in at least one direction, or may be performed partially.
  • the pre-stretching can be performed in any direction.
  • Pre-stretching is preferably performed on its original length or width in at least one direction.
  • the extension degree of the pre-extension is preferably 1.5 times or more and less than 2.5 times (typically 2.0 times), more preferably 2.5 times or more and less than 3.5 times (typically 3.times. 0 times), more preferably 3.5 times or more and less than 4.5 times (typically 4.0 times), particularly preferably 4.5 times or more and less than 5.5 times (typically 5.0 times) ).
  • the 2.0-fold pre-extension means that the original length is L, and the extension is 2 L (sometimes referred to as stretching).
  • the stretchable porous film of this invention can exhibit more excellent stretchability.
  • the stretchable porous film of this invention can express the more outstanding air permeability by combining with a filler by extending
  • Pre-extension is preferably performed at a temperature below the melting point of the polymer component.
  • the stretchable porous film of the present invention can exhibit more excellent stretchability.
  • the stretchable porous film of the present invention can exhibit better air permeability when combined with a filler.
  • the stretchable porous film of the present invention preferably exhibits excellent stretchability because the polymer component is plastically deformed or stretched beyond the brittle fracture point of the polymer by pre-stretching in this way. obtain.
  • the stretchable porous film of the present invention can be used for any appropriate article that can effectively use the effects of the present invention. That is, the article of the present invention includes the stretchable porous film of the present invention.
  • a typical example of such an article is an adhesive bandage.
  • Air permeability> The air permeability was measured using an Oken type air permeability meter (sec / 100cc) (manufactured by Asahi Seiko Co., Ltd., trade name: EG01-7-7MR). Those exceeding 99999 sec / 100 cc were judged as “no breathability”.
  • ⁇ Residual strain> A hysteresis test as shown in FIG. 3 is performed on a test piece having a width of 20 mm, from a distance between chucks of 30 mm to a distance between chucks of 60 mm at a pulling speed of 50 mm / min, held for 1 minute, and then the tension between the chucks is eliminated. The residual strain when the tension between the chucks was removed was measured. Regarding the measurement of residual strain, when the produced film is a uniaxially stretched film, the tensile direction is the direction orthogonal to the direction of the stretching (CD direction when stretched in the longitudinal (MD) direction). did.
  • ⁇ Evaluation of maceration phenomenon Prepare 100 parts of Quintac 3433N manufactured by Nippon Zeon Co., Ltd., 50 parts of Clearon M105 manufactured by Yasuhara Chemical Co., Ltd., and 150 parts of YS Resin TO-L manufactured by Yasuhara Chemical Co., Ltd. to prepare a hot melt adhesive (A). did.
  • the hot melt pressure-sensitive adhesive (A) is spray-coated on one side of the film to be evaluated, cut into a CD direction of 80 mm ⁇ longitudinal direction of 20 mm, wrapped around a fingertip, and observed for the state of the skin at the wound part after 24 hours. Evaluated by criteria. If the skin is not normal: ⁇ If skin is white: ⁇
  • the stretchable porous film of the present invention can be used for any appropriate article that can effectively use the effects of the present invention. That is, the article of the present invention includes the stretchable porous film of the present invention.
  • a typical example of such an article is an adhesive bandage.
  • Polymer component 10 Filler 20 Air gap 30 Elastic porous film 100

Abstract

Provided is an elastic porous film having excellent elastic properties and excellent breathability. Also provided is an article including such an elastic porous film. This elastic porous film is an elastic porous film having voids on the surface thereof, wherein the air permeability thereof measured by an Oken-type air permeability tester is less than 99999 sec/100 cc, the elastic porous film has an elongation direction in which the air permeability measured in a 100% elongated state by an Oken-type air permeability tester is less than 60000 sec/100 cc, and, in hysteresis testing, the elastic porous film has a pulling direction in which the residual strain is 10 mm or less when the elastic porous film is pulled from a width of 20 mm and an inter-chuck distance of 30 mm to an inter-chuck distance of 60 mm at a pulling speed of 50 mm/minute and held for 1 minute, and pulling of the inter-chuck distance is then released.

Description

伸縮性多孔質フィルムおよび物品Stretchable porous film and article
　本発明は、伸縮性多孔質フィルムおよび物品に関する。 The present invention relates to a stretchable porous film and an article.
　絆創膏などの衛生用品等の伸縮性物品には、種々の伸縮性フィルムが採用されている。 Various elastic films are used for elastic articles such as hygiene products such as adhesive bandages.
　このような伸縮性フィルムには、優れた伸縮性が要求されるだけでなく、用途に応じて、優れた通気性が求められることがある。例えば、従来の代表的な絆創膏（例えば、特許文献１参照）は、それが有する伸縮性フィルムのポリマー成分としてポリ塩化ビニルを用いているため、防水性はある程度有するものの、通気性が悪く、肌に貼付している間に該貼付された部分の肌が蒸れてしまって白くなるという浸軟現象が起こってしまう問題がある。 Such a stretchable film is required not only to have excellent stretchability but also to have excellent breathability depending on the application. For example, a conventional representative bandage (see, for example, Patent Document 1) uses polyvinyl chloride as a polymer component of the stretchable film that it has. There is a problem that a maceration phenomenon occurs in which the skin of the affixed portion is steamed and whitened while it is affixed to the abdomen.
特開２０００－１６７０３７号公報JP 2000-167037 A
　本発明は上記従来の課題を解決するためになされたものであり、その目的とするところは、優れた伸縮性および優れた通気性を有する伸縮性多孔質フィルムを提供することにある。また、そのような伸縮性多孔質フィルムを含む物品を提供することにある。 The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a stretchable porous film having excellent stretchability and excellent breathability. Moreover, it is providing the articles | goods containing such a stretchable porous film.
　本発明の伸縮性多孔質フィルムは、
　表面に空隙を有する伸縮性多孔質フィルムであって、
　王研式透気度計により測定される透気度が９９９９９ｓｅｃ／１００ｃｃ未満であり、
　１００％伸長した状態での王研式透気度計により測定される透気度が６００００ｓｅｃ／１００ｃｃ未満となる伸長方向を有し、
　ヒステリシス試験において、幅２０ｍｍ、チャック間距離３０ｍｍから、引張速度５０ｍｍ／分にてチャック間距離６０ｍｍまで引張り、１分間保持した後、チャック間距離の引張りをなくしたときの残留歪みが１０ｍｍ以下となる引張り方向を有する。 The stretchable porous film of the present invention is
A stretchable porous film having voids on the surface,
The air permeability measured by the Oken air permeability meter is less than 99999 sec / 100 cc,
The air permeability measured by the Oken air permeability meter in a state of 100% extension has an extension direction that is less than 60000 sec / 100 cc,
In the hysteresis test, after pulling from a width of 20 mm and an inter-chuck distance of 30 mm to an inter-chuck distance of 60 mm at a pulling speed of 50 mm / min and holding for 1 minute, the residual strain when the inter-chuck distance is removed is 10 mm or less. Has a tensile direction.
　一つの実施形態においては、上記王研式透気度計により測定される透気度が６００００ｓｅｃ／１００ｃｃ未満である。 In one embodiment, the air permeability measured by the Oken air permeability meter is less than 60000 sec / 100 cc.
　一つの実施形態においては、上記王研式透気度計により測定される透気度が４００００ｓｅｃ／１００ｃｃ未満である。 In one embodiment, the air permeability measured by the Oken air permeability meter is less than 40000 sec / 100 cc.
　一つの実施形態においては、上記１００％伸長した状態での王研式透気度計により測定される透気度が３００００ｓｅｃ／１００ｃｃ未満である。 In one embodiment, the air permeability measured by the Oken air permeability meter in the 100% stretched state is less than 30000 sec / 100 cc.
　一つの実施形態においては、上記１００％伸長した状態での王研式透気度計により測定される透気度が５０００ｓｅｃ／１００ｃｃ未満である。 In one embodiment, the air permeability measured by the Oken air permeability meter in the 100% stretched state is less than 5000 sec / 100 cc.
　一つの実施形態においては、上記残留歪みが８ｍｍ～１ｍｍである。 In one embodiment, the residual strain is 8 mm to 1 mm.
　一つの実施形態においては、上記残留歪みが６ｍｍ～２ｍｍである。 In one embodiment, the residual strain is 6 mm to 2 mm.
　一つの実施形態においては、本発明の伸縮性多孔質フィルムは、厚みが３０μｍ～３００μｍである。 In one embodiment, the stretchable porous film of the present invention has a thickness of 30 μm to 300 μm.
　一つの実施形態においては、本発明の伸縮性多孔質フィルムは、厚みが５０μｍ～１５０μｍである。 In one embodiment, the stretchable porous film of the present invention has a thickness of 50 μm to 150 μm.
　一つの実施形態においては、本発明の伸縮性多孔質フィルムは、ポリマー成分と充填剤を含む。 In one embodiment, the stretchable porous film of the present invention includes a polymer component and a filler.
　一つの実施形態においては、上記ポリマー成分がプロピレン系エラストマーを含む。 In one embodiment, the polymer component includes a propylene-based elastomer.
　一つの実施形態においては、上記ポリマー成分中の上記プロピレン系エラストマーの含有割合が３０重量％～１００重量％である。 In one embodiment, the content of the propylene-based elastomer in the polymer component is 30% by weight to 100% by weight.
　一つの実施形態においては、上記プロピレン系エラストマーのＭＦＲが０．１ｇ／１０分～１８ｇ／１０分である。 In one embodiment, the propylene-based elastomer has an MFR of 0.1 g / 10 min to 18 g / 10 min.
　一つの実施形態においては、上記プロピレン系エラストマーのＭＦＲが２ｇ／１０分～５ｇ／１０分である。 In one embodiment, the propylene-based elastomer has an MFR of 2 g / 10 min to 5 g / 10 min.
　一つの実施形態においては、上記プロピレン系エラストマーがメタロセン系エラストマーである。 In one embodiment, the propylene elastomer is a metallocene elastomer.
　一つの実施形態においては、上記ポリマー成分が直鎖状低密度ポリエチレンを含む。 In one embodiment, the polymer component includes linear low density polyethylene.
　一つの実施形態においては、上記ポリマー成分中の上記直鎖状低密度ポリエチレンの含有割合が５重量％～６０重量％である。 In one embodiment, the content of the linear low-density polyethylene in the polymer component is 5% by weight to 60% by weight.
　一つの実施形態においては、上記充填剤が、無機粒子、有機粒子から選ばれる少なくとも１種である。 In one embodiment, the filler is at least one selected from inorganic particles and organic particles.
　本発明の物品は、本発明の伸縮性多孔質フィルムを含む。 The article of the present invention includes the stretchable porous film of the present invention.
　一つの実施形態においては、本発明の物品は、粘着剤層を有する。 In one embodiment, the article of the present invention has an adhesive layer.
　本発明によれば、優れた伸縮性および優れた通気性を有する伸縮性多孔質フィルムを提供できる。また、そのような伸縮性多孔質フィルムを含む物品を提供できる。 According to the present invention, a stretchable porous film having excellent stretchability and excellent breathability can be provided. Moreover, the articles | goods containing such a stretchable porous film can be provided.
本発明の一つの実施形態による伸縮性多孔質フィルムの一例の概略平面図である。It is a schematic plan view of an example of the elastic porous film by one embodiment of the present invention. 本発明の一つの実施形態による伸縮性多孔質フィルムの別の一例の概略平面図である。It is a schematic plan view of another example of the stretchable porous film according to one embodiment of the present invention. 残留歪みを測定する際のヒステリシス試験の応力と歪みとの関係を表す図。The figure showing the relationship between the stress and distortion of a hysteresis test at the time of measuring a residual distortion.
≪伸縮性多孔質フィルム≫
　本発明の伸縮性多孔質フィルムは、表面に空隙を有する伸縮性多孔質フィルムである。本発明の伸縮性多孔質フィルムは、表面に空隙を有することにより、優れた通気性を有する。 ≪Stretchable porous film≫
The stretchable porous film of the present invention is a stretchable porous film having voids on the surface. The stretchable porous film of the present invention has excellent air permeability by having voids on the surface.
　本発明の伸縮性多孔質フィルムは、王研式透気度計により測定される透気度が９９９９９ｓｅｃ／１００ｃｃ未満であり、好ましくは８００００ｓｅｃ／１００ｃｃ未満であり、より好ましくは７００００ｓｅｃ／１００ｃｃ未満であり、さらに好ましくは６００００ｓｅｃ／１００ｃｃ未満であり、特に好ましくは５００００ｓｅｃ／１００ｃｃ未満であり、最も好ましくは４００００ｓｅｃ／１００ｃｃ未満である。本発明の伸縮性多孔質フィルムの王研式透気度計により測定される透気度が上記範囲内にあれば、本発明の伸縮性多孔質フィルムは、優れた通気性を有することができる。 The stretchable porous film of the present invention has an air permeability of less than 99999 sec / 100 cc, preferably less than 80000 sec / 100 cc, more preferably less than 70000 sec / 100 cc, as measured by the Oken air permeability meter. More preferably, it is less than 60000 sec / 100 cc, particularly preferably less than 50000 sec / 100 cc, and most preferably less than 40000 sec / 100 cc. If the air permeability measured by the Oken air permeability meter of the stretchable porous film of the present invention is within the above range, the stretchable porous film of the present invention can have excellent air permeability. .
　本発明の伸縮性多孔質フィルムは、１００％伸長した状態での王研式透気度計により測定される透気度が６００００ｓｅｃ／１００ｃｃ未満となる伸長方向を有する。この透気度は、好ましくは５００００ｓｅｃ／１００ｃｃ未満であり、より好ましくは４００００ｓｅｃ／１００ｃｃ未満であり、さらに好ましくは３００００ｓｅｃ／１００ｃｃ未満であり、特に好ましくは１００００ｓｅｃ／１００ｃｃ未満であり、最も好ましくは５０００ｓｅｃ／１００ｃｃ未満である。本発明の伸縮性多孔質フィルムが、１００％伸長した状態での王研式透気度計により測定される透気度が上記範囲内となる伸長方向を有すれば、本発明の伸縮性多孔質フィルムは、伸長状態において優れた通気性を有することができる。 The stretchable porous film of the present invention has an extension direction in which the air permeability measured by the Oken air permeability meter in a state of 100% extension is less than 60000 sec / 100 cc. This air permeability is preferably less than 50000 sec / 100 cc, more preferably less than 40000 sec / 100 cc, still more preferably less than 30000 sec / 100 cc, particularly preferably less than 10000 sec / 100 cc, and most preferably 5000 sec / Less than 100cc. If the stretchable porous film of the present invention has an elongation direction in which the air permeability measured by the Oken type air permeability meter in a state of 100% elongation is in the above range, the stretchable porous film of the present invention. The quality film can have excellent air permeability in the stretched state.
　なお、上記「伸長方向を有する」とは、本発明の伸縮性多孔質フィルムにおいて、上記透気度が上記範囲内となる伸長方向を少なくとも１方向有すればよいことを意味する。このような伸長方向としては、代表的には、本発明の伸縮性多孔質フィルムが未延伸のフィルムである場合は該フィルムの全ての方向が好ましく挙げられ、本発明の伸縮性多孔質フィルムが一軸延伸されたフィルムである場合は該延伸の方向と直交する方向（長手（ＭＤ）方向に延伸した場合はＣＤ方向）が好ましく挙げられる。また、本発明の伸縮性多孔質フィルムが二軸延伸されたフィルムである場合は、同時延伸か逐次延伸か、二軸の延伸倍率の違い、などの各種条件により、上記透気度が上記範囲内となる伸長方向が決まることになる。 In addition, the above-mentioned “having an extension direction” means that the stretchable porous film of the present invention may have at least one extension direction in which the air permeability falls within the above range. As such an extension direction, typically, when the stretchable porous film of the present invention is an unstretched film, all directions of the film are preferably exemplified. In the case of a uniaxially stretched film, a direction orthogonal to the direction of stretching (CD direction when stretched in the longitudinal (MD) direction) is preferably exemplified. In addition, when the stretchable porous film of the present invention is a biaxially stretched film, the air permeability is within the above range depending on various conditions such as simultaneous stretching or sequential stretching or a difference in biaxial stretching ratio. The inner extension direction is determined.
　本発明の伸縮性多孔質フィルムは、ヒステリシス試験において、幅２０ｍｍ、チャック間距離３０ｍｍから、引張速度５０ｍｍ／分にてチャック間距離６０ｍｍまで引張り、１分間保持した後、チャック間距離の引張りをなくしたときの残留歪みが１０ｍｍ以下となる引張り方向を有する。この残留歪みは、好ましくは９ｍｍ～１ｍｍであり、より好ましくは８ｍｍ～１ｍｍであり、さらに好ましくは７ｍｍ～１ｍｍであり、特に好ましくは６ｍｍ～２ｍｍであり、最も好ましくは５ｍｍ～３ｍｍである。本発明の伸縮性多孔質フィルムが、上記残留歪みが上記範囲内となる引張り方向を有すれば、本発明の伸縮性多孔質フィルムは、優れた伸縮性を有することができる。 The stretchable porous film of the present invention has a tensile strength of 20 mm and a distance between chucks of 30 mm to a distance between chucks of 60 mm at a tensile speed of 50 mm / min and is held for 1 minute in a hysteresis test. The tensile strain is such that the residual strain is 10 mm or less. This residual strain is preferably 9 mm to 1 mm, more preferably 8 mm to 1 mm, still more preferably 7 mm to 1 mm, particularly preferably 6 mm to 2 mm, and most preferably 5 mm to 3 mm. If the stretchable porous film of the present invention has a tensile direction in which the residual strain falls within the above range, the stretchable porous film of the present invention can have excellent stretchability.
　なお、上記「引張り方向を有する」とは、本発明の伸縮性多孔質フィルムにおいて、上記残留歪みが上記範囲内となる引張り方向が少なくとも１方向有すればよいことを意味する。このような引張り方向としては、代表的には、本発明の伸縮性多孔質フィルムが未延伸のフィルムである場合は該フィルムの全ての方向が好ましく挙げられ、本発明の伸縮性多孔質フィルムが一軸延伸されたフィルムである場合は該延伸の方向と直交する方向（長手（ＭＤ）方向に延伸した場合はＣＤ方向）が好ましく挙げられる。また、本発明の伸縮性多孔質フィルムが二軸延伸されたフィルムである場合は、同時延伸か逐次延伸か、二軸の延伸倍率の違い、などの各種条件により、上記残留歪みが上記範囲内となる引張り方向が決まることになる。 The term “having a tensile direction” means that the stretchable porous film of the present invention only needs to have at least one tensile direction in which the residual strain falls within the above range. As such a pulling direction, typically, when the stretchable porous film of the present invention is an unstretched film, all directions of the film are preferably mentioned, and the stretchable porous film of the present invention is In the case of a uniaxially stretched film, a direction orthogonal to the direction of stretching (CD direction when stretched in the longitudinal (MD) direction) is preferably exemplified. In addition, when the stretchable porous film of the present invention is a biaxially stretched film, the residual strain is within the above range depending on various conditions such as simultaneous stretching or sequential stretching or a difference in biaxial stretching ratio. The pulling direction is determined.
　本発明の伸縮性多孔質フィルムの厚みは、好ましくは３０μｍ～３００μｍであり、より好ましくは４０μｍ～２００μｍであり、さらに好ましくは５０μｍ～１５０μｍであり、特に好ましくは６０μｍ～１４０μｍであり、最も好ましくは７０μｍ～１２０μｍである。本発明の伸縮性多孔質フィルムの厚みが上記範囲内にあれば、本発明の伸縮性多孔質フィルムは、より優れた伸縮性およびより優れた通気性を有することができる。 The thickness of the stretchable porous film of the present invention is preferably 30 μm to 300 μm, more preferably 40 μm to 200 μm, still more preferably 50 μm to 150 μm, particularly preferably 60 μm to 140 μm, and most preferably. 70 μm to 120 μm. If the thickness of the stretchable porous film of the present invention is within the above range, the stretchable porous film of the present invention can have better stretchability and better breathability.
　本発明の伸縮性多孔質フィルムは、好ましくは、ポリマー成分と充填剤を含む。 The stretchable porous film of the present invention preferably contains a polymer component and a filler.
　図１は、本発明の一つの実施形態による伸縮性多孔質フィルムの一例の概略平面図である。図１において、伸縮性多孔質フィルム１００は、ポリマー成分１０と充填剤２０を含む。 FIG. 1 is a schematic plan view of an example of a stretchable porous film according to one embodiment of the present invention. In FIG. 1, the stretchable porous film 100 includes a polymer component 10 and a filler 20.
　図２は、本発明の一つの実施形態による伸縮性多孔質フィルムの別の一例の概略平面図である。図２において、伸縮性多孔質フィルム１００は、ポリマー成分１０と充填剤２０を含み、さらに空隙３０を含む。 FIG. 2 is a schematic plan view of another example of a stretchable porous film according to one embodiment of the present invention. In FIG. 2, the stretchable porous film 100 includes a polymer component 10 and a filler 20, and further includes a void 30.
　本発明の伸縮性多孔質フィルムが図１に示すような実施形態である場合、伸長を行うことで図２に示すような実施形態となり得る。すなわち、本発明の伸縮性多孔質フィルムが図１に示すような実施形態である場合、本発明の伸縮性多孔質フィルムは、伸長を行うことで表面に適度な空隙が生じ得る。この適度な空隙により、本発明の伸縮性多孔質フィルムは、十分な通気性を発現することできる。さらに、従来の代表的な絆創膏と同様、防水性も有することができる。 In the case where the stretchable porous film of the present invention is an embodiment as shown in FIG. 1, it can be an embodiment as shown in FIG. 2 by stretching. That is, when the stretchable porous film of the present invention is an embodiment as shown in FIG. 1, the stretchable porous film of the present invention can generate an appropriate void on the surface by stretching. Due to this appropriate gap, the stretchable porous film of the present invention can exhibit sufficient air permeability. Furthermore, it can also have waterproofness like a conventional typical bandage.
　本発明の伸縮性多孔質フィルムは、図１に示すような実施形態である場合、充填剤の存在によって、ポリマー成分と充填剤との界面が存在するため、伸長を行わなくても優れた通気性を発現し得る。 When the stretchable porous film of the present invention is an embodiment as shown in FIG. 1, the presence of the filler causes the presence of an interface between the polymer component and the filler. Sex can be expressed.
　本発明の伸縮性多孔質フィルムは、用いる部位の要求性能に応じて、図１に示すような実施形態や図２に示すような実施形態を採用し得る。 The stretchable porous film of the present invention can adopt an embodiment as shown in FIG. 1 or an embodiment as shown in FIG. 2 according to the required performance of the part to be used.
　本発明の伸縮性多孔質フィルムにおいて、ポリマー成分は、本発明の効果を損なわない範囲で任意の適切なポリマー成分を採用し得る。 In the stretchable porous film of the present invention, any appropriate polymer component can be adopted as the polymer component as long as the effects of the present invention are not impaired.
　ポリマー成分は、好ましくはプロピレン系エラストマーを含む。 The polymer component preferably contains a propylene-based elastomer.
　ポリマー成分がプロピレン系エラストマーを含むことにより、本発明の伸縮性多孔質フィルムは、より優れた伸縮性を発現し得る。また、ポリマー成分がプロピレン系エラストマーを含むことにより、充填剤と組み合わせることで、本発明の伸縮性多孔質フィルムは、より優れた通気性を発現し得る。 When the polymer component contains a propylene-based elastomer, the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, the stretchable porous film of this invention can express the more outstanding air permeability by combining with a filler because a polymer component contains a propylene-type elastomer.
　プロピレン系エラストマーは、１種のみであってもよいし、２種以上であってもよい。 Only one type of propylene-based elastomer may be used, or two or more types may be used.
　本発明の伸縮性多孔質フィルムがプロピレン系エラストマーを含むことによって、熱安定性が向上し、例えば、本発明の伸縮性多孔質フィルムを製造する際の熱劣化を抑制し得る。また、本発明の伸縮性多孔質フィルムがプロピレン系エラストマーを含むことによって、保存安定性が向上し、本発明の伸縮性多孔質フィルムを保存している間における物性値の変動を抑制し得る。 When the stretchable porous film of the present invention contains a propylene-based elastomer, the thermal stability is improved, and for example, the thermal deterioration during the production of the stretchable porous film of the present invention can be suppressed. Moreover, when the stretchable porous film of the present invention contains a propylene-based elastomer, storage stability is improved, and fluctuations in physical property values during storage of the stretchable porous film of the present invention can be suppressed.
　本発明の伸縮性多孔質フィルムがプロピレン系エラストマーを含むことによって、本発明の伸縮性多孔質フィルムの製造工程が簡素化でき、加工費を抑制し得る。これは、プロピレン系エラストマーを採用すると、本発明の伸縮性多孔質フィルムを製造する際に押出成形することが可能となり、マスターバッチを作製する必要がなくなり得るからである。 The production process of the stretchable porous film of the present invention can be simplified and the processing cost can be suppressed by including the propylene-based elastomer in the stretchable porous film of the present invention. This is because when a propylene-based elastomer is employed, it is possible to perform extrusion molding when producing the stretchable porous film of the present invention, and it becomes unnecessary to produce a masterbatch.
　ポリマー成分中のプロピレン系エラストマーの含有割合は、本発明の効果がより発現する点で、好ましくは３０重量％～１００重量％であり、より好ましくは４０重量％～９５重量％であり、さらに好ましくは５０重量％～９０重量％であり、特に好ましくは５５重量％～８５重量％であり、最も好ましくは６０重量％～８０重量％である。ポリマー成分中のプロピレン系エラストマーの含有割合を上記範囲内とすれば、本発明の伸縮性多孔質フィルムは、より優れた伸縮性を発現し得る。また、ポリマー成分中のプロピレン系エラストマーの含有割合を上記範囲内とすれば、本発明の伸縮性多孔質フィルムは、充填剤と組み合わせることで、より優れた通気性を発現し得る。 The content of the propylene-based elastomer in the polymer component is preferably 30% by weight to 100% by weight, more preferably 40% by weight to 95% by weight, and still more preferably, from the viewpoint that the effects of the present invention are more manifested. Is 50% to 90% by weight, particularly preferably 55% to 85% by weight, and most preferably 60% to 80% by weight. When the content ratio of the propylene-based elastomer in the polymer component is within the above range, the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, if the content rate of the propylene-type elastomer in a polymer component shall be in the said range, the stretchable porous film of this invention can express the more superior air permeability by combining with a filler.
　プロピレン系エラストマーとしては、例えば、プロピレンコポリマー、プロピレンオレフィンブロックコポリマー、プロピレンオレフィンランダムコポリマー、プロピレンエチレンオレフィンブロックコポリマー、アモルファスポリプロピレンなどが挙げられる。 Examples of the propylene elastomer include propylene copolymer, propylene olefin block copolymer, propylene olefin random copolymer, propylene ethylene olefin block copolymer, and amorphous polypropylene.
　プロピレン系エラストマーとしては、その密度が、好ましくは０．８９０ｇ／ｃｍ３～０．８３０ｇ／ｃｍ３であり、より好ましくは０．８８８ｇ／ｃｍ３～０．８３５ｇ／ｃｍ３であり、さらに好ましくは０．８８６ｇ／ｃｍ３～０．８３５ｇ／ｃｍ３であり、特に好ましくは０．８８５ｇ／ｃｍ３～０．８４０ｇ／ｃｍ３であり、最も好ましくは０．８８５ｇ／ｃｍ３～０．８４５ｇ／ｃｍ３である。プロピレン系エラストマーの密度を上記範囲内とすれば、本発明の伸縮性多孔質フィルムは、より優れた伸縮性を発現し得る。また、プロピレン系エラストマーの密度を上記範囲内とすれば、本発明の伸縮性多孔質フィルムは、充填剤と組み合わせることで、より優れた通気性を発現し得る。 Examples of the propylene-based elastomer, its density, preferably 0.890g / cm 3 ~ 0.830g / cm 3, more preferably 0.888g / cm 3 ~ 0.835g / cm 3, more preferably 0.886 g / cm 3 to 0.835 g / cm 3 , particularly preferably 0.885 g / cm 3 to 0.840 g / cm 3 , and most preferably 0.885 g / cm 3 to 0.845 g / cm 3. 3 . If the density of the propylene-based elastomer is within the above range, the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, if the density of a propylene-type elastomer is made into the said range, the stretchable porous film of this invention can express the more outstanding air permeability by combining with a filler.
　プロピレン系エラストマーとしては、その２３０℃で２．１６ｋｇｆにおけるＭＦＲが、好ましくは０．１ｇ／１０分～１８ｇ／１０分であり、より好ましくは０．５ｇ／１０分～１５ｇ／１０分であり、さらに好ましくは１．０ｇ／１０分～１０ｇ／１０分であり、特に好ましくは１．５ｇ／１０分～７ｇ／１０分であり、最も好ましくは２ｇ／１０分～５ｇ／１０分である。プロピレン系エラストマーの上記ＭＦＲを上記範囲内とすれば、本発明の伸縮性多孔質フィルムは、より優れた伸縮性を発現し得る。また、プロピレン系エラストマーの上記ＭＦＲを上記範囲内とすれば、本発明の伸縮性多孔質フィルムは、充填剤と組み合わせることで、より優れた通気性を発現し得る。 The propylene elastomer has an MFR at 230 ° C. of 2.16 kgf of preferably 0.1 g / 10 min to 18 g / 10 min, more preferably 0.5 g / 10 min to 15 g / 10 min. More preferably, it is 1.0 g / 10 min to 10 g / 10 min, particularly preferably 1.5 g / 10 min to 7 g / 10 min, and most preferably 2 g / 10 min to 5 g / 10 min. When the MFR of the propylene-based elastomer is within the above range, the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, if the MFR of the propylene-based elastomer is within the above range, the stretchable porous film of the present invention can exhibit better air permeability when combined with a filler.
　プロピレン系エラストマーは、市販品として入手することも可能である。このような市販品としては、例えば、三井化学株式会社製の「タフマー」（登録商標）シリーズの中のいくつか、エクソンモービル社製の「ビスタマックス（Ｖｉｓｔａｍａｘｘ）」（登録商標）シリーズの中のいくつか（例えば、ビスタマックス７０１０等）が挙げられる。 Propylene elastomer can be obtained as a commercial product. Examples of such commercially available products include, for example, some of “Tafmer” (registered trademark) series manufactured by Mitsui Chemicals, Inc., and “Vistamaxx” (registered trademark) series manufactured by ExxonMobil. Some (for example, Vistamax 7010) can be mentioned.
　プロピレン系エラストマーは、好ましくは、メタロセン系エラストマー（メタロセン系エラストマーであるプロピレン系エラストマーをメタロセンポリプロピレン系エラストマーと称することがある）である。メタロセン系エラストマーとは、メタロセン触媒を用いて製造されたエラストマーである。プロピレン系エラストマーとしてメタロセン系エラストマーを採用することにより、本発明の伸縮性多孔質フィルムは、より優れた伸縮性を発現し得る。また、プロピレン系エラストマーとしてメタロセン系エラストマーを採用することにより、本発明の伸縮性多孔質フィルムは、充填剤と組み合わせることで、より優れた通気性を発現し得る。 The propylene-based elastomer is preferably a metallocene-based elastomer (a propylene-based elastomer that is a metallocene-based elastomer may be referred to as a metallocene polypropylene-based elastomer). The metallocene elastomer is an elastomer produced using a metallocene catalyst. By adopting a metallocene elastomer as a propylene elastomer, the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, by adopting a metallocene elastomer as a propylene elastomer, the stretchable porous film of the present invention can exhibit better air permeability when combined with a filler.
　ポリマー成分は、好ましくは直鎖状低密度ポリエチレンを含む。 The polymer component preferably contains linear low density polyethylene.
　ポリマー成分がプロピレン系エラストマーとともに直鎖状低密度ポリエチレンを含むことにより、本発明の伸縮性多孔質フィルムは、より優れた伸縮性を発現し得る。また、ポリマー成分がプロピレン系エラストマーとともに直鎖状低密度ポリエチレンを含むことにより、充填剤と組み合わせることで、本発明の伸縮性多孔質フィルムは、より優れた通気性を発現し得る。 When the polymer component contains linear low-density polyethylene together with the propylene-based elastomer, the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, the stretchable porous film of this invention can express the more outstanding air permeability by combining with a filler because a polymer component contains a linear low density polyethylene with a propylene-type elastomer.
　直鎖状低密度ポリエチレンは、１種のみであってもよいし、２種以上であってもよい。 The linear low density polyethylene may be only one kind or two or more kinds.
　本発明の伸縮性多孔質フィルムがプロピレン系エラストマーとともに直鎖状低密度ポリエチレンを含むことによって、熱安定性が向上し、例えば、本発明の伸縮性多孔質フィルムを製造する際の熱劣化を抑制し得る。また、本発明の伸縮性多孔質フィルムがプロピレン系エラストマーとともに直鎖状低密度ポリエチレンを含むことによって、保存安定性が向上し、本発明の伸縮性多孔質フィルムを保存している間における物性値の変動を抑制し得る。 When the stretchable porous film of the present invention contains linear low-density polyethylene together with the propylene-based elastomer, the thermal stability is improved, for example, the thermal deterioration during the production of the stretchable porous film of the present invention is suppressed. Can do. In addition, since the stretchable porous film of the present invention contains linear low-density polyethylene together with the propylene-based elastomer, the storage stability is improved, and the physical property values during storage of the stretchable porous film of the present invention Fluctuations can be suppressed.
　本発明の伸縮性多孔質フィルムがプロピレン系エラストマーとともに直鎖状低密度ポリエチレンを含むことによって、本発明の伸縮性多孔質フィルムの製造工程が簡素化でき、加工費を抑制し得る。これは、プロピレン系エラストマーとともに直鎖状低密度ポリエチレンを採用すると、本発明の伸縮性多孔質フィルムを製造する際に押出成形することが可能となり、マスターバッチを作製する必要がなくなり得るからである。 The stretchable porous film of the present invention contains linear low density polyethylene together with a propylene-based elastomer, whereby the production process of the stretchable porous film of the present invention can be simplified and processing costs can be suppressed. This is because when a linear low density polyethylene is used together with a propylene-based elastomer, it becomes possible to extrude when producing the stretchable porous film of the present invention, and there is no need to prepare a masterbatch. .
　ポリマー成分中の直鎖状低密度ポリエチレンの含有割合は、本発明の効果がより発現する点で、好ましくは０重量％～７０重量％であり、より好ましくは５重量％～６０重量％であり、さらに好ましくは１０重量％～５０重量％であり、特に好ましくは１５重量％～４５重量％であり、最も好ましくは２０重量％～４０重量％である。ポリマー成分中の直鎖状低密度ポリエチレンの含有割合を上記範囲内とすれば、本発明の伸縮性多孔質フィルムは、より優れた伸縮性を発現し得る。また、ポリマー成分中の直鎖状低密度ポリエチレンの含有割合を上記範囲内とすれば、本発明の伸縮性多孔質フィルムは、充填剤と組み合わせることで、より優れた通気性を発現し得る。 The content of the linear low density polyethylene in the polymer component is preferably 0% by weight to 70% by weight, more preferably 5% by weight to 60% by weight, from the viewpoint that the effect of the present invention is more manifested. More preferably, it is 10 to 50% by weight, particularly preferably 15 to 45% by weight, and most preferably 20 to 40% by weight. If the content rate of the linear low density polyethylene in a polymer component shall be in the said range, the stretchable porous film of this invention can express the more excellent stretchability. Moreover, if the content rate of the linear low density polyethylene in a polymer component shall be in the said range, the stretchable porous film of this invention can express the more outstanding air permeability by combining with a filler.
　直鎖状低密度ポリエチレンとしては、その密度が、好ましくは０．９１０ｇ／ｃｍ３～０．９４０ｇ／ｃｍ３である。直鎖状低密度ポリエチレンの密度を上記範囲内とすれば、本発明の伸縮性多孔質フィルムは、より優れた伸縮性を発現し得る。また、直鎖状低密度ポリエチレンの密度を上記範囲内とすれば、本発明の伸縮性多孔質フィルムは、充填剤と組み合わせることで、より優れた通気性を発現し得る。 The linear low density polyethylene preferably has a density of 0.910 g / cm 3 to 0.940 g / cm 3 . If the density of the linear low-density polyethylene is within the above range, the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, if the density of linear low density polyethylene is made into the said range, the stretchable porous film of this invention can express the more outstanding air permeability by combining with a filler.
　直鎖状低密度ポリエチレンとしては、その２３０℃で２．１６ｋｇｆにおけるＭＦＲが、好ましくは１ｇ／１０分～５０ｇ／１０分である。直鎖状低密度ポリエチレンの上記ＭＦＲを上記範囲内とすれば、本発明の伸縮性多孔質フィルムは、より優れた伸縮性を発現し得る。また、直鎖状低密度ポリエチレンの上記ＭＦＲを上記範囲内とすれば、本発明の伸縮性多孔質フィルムは、充填剤と組み合わせることで、より優れた通気性を発現し得る。 As the linear low density polyethylene, the MFR at 2.16 kgf at 230 ° C. is preferably 1 g / 10 min to 50 g / 10 min. If the MFR of the linear low density polyethylene is within the above range, the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, if the said MFR of linear low density polyethylene is made into the said range, the stretchable porous film of this invention can express the more excellent air permeability by combining with a filler.
　直鎖状低密度ポリエチレンは、市販品として入手することも可能である。このような市販品としては、例えば、株式会社プライムポリマー製の「ウルトゼックス」（登録商標）シリーズの中のいくつかが挙げられる。 Linear low density polyethylene can also be obtained as a commercial product. Examples of such commercially available products include some of the “Ultzex” (registered trademark) series manufactured by Prime Polymer Co., Ltd.
　直鎖状低密度ポリエチレンは、好ましくは、メタロセン系直鎖状低密度ポリエチレンである。メタロセン系直鎖状低密度ポリエチレンとは、メタロセン触媒を用いて製造された直鎖状低密度ポリエチレンである。直鎖状低密度ポリエチレンとしてメタロセン系直鎖状低密度ポリエチレンを採用することにより、本発明の伸縮性多孔質フィルムは、より優れた伸縮性を発現し得る。また、鎖状低密度ポリエチレンとしてメタロセン系直鎖状低密度ポリエチレンを採用することにより、本発明の伸縮性多孔質フィルムは、充填剤と組み合わせることで、より優れた通気性を発現し得る。 The linear low density polyethylene is preferably a metallocene linear low density polyethylene. The metallocene-based linear low density polyethylene is a linear low density polyethylene produced using a metallocene catalyst. By employing a metallocene linear low density polyethylene as the linear low density polyethylene, the stretchable porous film of the present invention can exhibit more excellent stretchability. In addition, by employing a metallocene linear low density polyethylene as the chain low density polyethylene, the stretchable porous film of the present invention can exhibit better air permeability when combined with a filler.
　本発明の伸縮性多孔質フィルムは、好ましくは、充填剤を含む。充填剤としては、好ましくは、無機粒子、有機粒子から選ばれる少なくとも１種である。充填剤は、１種のみであってもよいし、２種以上であってもよい。本発明の伸縮性多孔質フィルムが充填剤を含むことにより、本発明の伸縮性多孔質フィルムは、より優れた通気性を発現し得る。 The stretchable porous film of the present invention preferably contains a filler. The filler is preferably at least one selected from inorganic particles and organic particles. Only one type of filler may be used, or two or more types may be used. When the stretchable porous film of the present invention contains a filler, the stretchable porous film of the present invention can exhibit better air permeability.
　無機粒子としては、例えば、タルク、酸化チタン、酸化カルシウム、酸化マグネシウム、酸化亜鉛、酸化チタン、炭酸カルシウム、シリカ、クレー、マイカ、硫酸バリウム、ウィスカー、水酸化マグネシウムなどが挙げられる。 Examples of the inorganic particles include talc, titanium oxide, calcium oxide, magnesium oxide, zinc oxide, titanium oxide, calcium carbonate, silica, clay, mica, barium sulfate, whisker, and magnesium hydroxide.
　有機粒子としては、例えば、アクリルビーズ、スチレンビーズ、シリコーン樹脂粒子などが挙げられる。 Examples of the organic particles include acrylic beads, styrene beads, and silicone resin particles.
　充填剤の平均粒径としては、本発明の効果を損なわない範囲で、任意の適切な平均粒径を採用し得る。このような充填剤の平均粒径としては、好ましくは０．５μｍ～５０μｍである。充填剤の平均粒径を上記範囲内に調整することにより、本発明の伸縮性多孔質フィルムは、より優れた通気性を発現し得る。 As the average particle diameter of the filler, any appropriate average particle diameter can be adopted as long as the effects of the present invention are not impaired. The average particle size of such a filler is preferably 0.5 μm to 50 μm. By adjusting the average particle diameter of the filler within the above range, the stretchable porous film of the present invention can exhibit better air permeability.
　充填剤の含有量は、本発明の効果を損なわない範囲で、任意の適切な含有量を採用し得る。このような充填剤の含有量としては、伸縮性多孔質フィルム中のポリマー成分１００重量部に対して、好ましくは５０重量部～４００重量部である。充填剤の含有量を上記範囲内に調整することにより、本発明の伸縮性多孔質フィルムは、より優れた通気性を発現し得る。 Arbitrary appropriate content can be employ | adopted for content of a filler in the range which does not impair the effect of this invention. The content of such a filler is preferably 50 to 400 parts by weight with respect to 100 parts by weight of the polymer component in the stretchable porous film. By adjusting the content of the filler within the above range, the stretchable porous film of the present invention can exhibit better air permeability.
　充填剤は、凝集防止のために、離型剤によってコーティングされていてもよい。このような離型剤としては、例えば、脂肪酸アマイド系離型剤、シリコーン系離型剤、フッ素系離型剤、長鎖アルキル系離型剤等が挙げられる。好ましくは脂肪酸アマイド系離型剤であり、より好ましくは飽和脂肪酸ビスアマイドである。離型剤の使用量は、任意の適切な使用量を採用し得る。 The filler may be coated with a release agent to prevent aggregation. Examples of such release agents include fatty acid amide release agents, silicone release agents, fluorine release agents, and long chain alkyl release agents. A fatty acid amide release agent is preferable, and a saturated fatty acid bisamide is more preferable. Arbitrary appropriate usage-amount can be employ | adopted for the usage-amount of a mold release agent.
　本発明の伸縮性多孔質フィルムは、本発明の効果を損なわない範囲で、任意の適切な他の成分を含んでいても良い。これらは、１種のみであってもよいし、２種以上であってもよい。このような他の成分としては、例えば、紫外線吸収剤、耐熱安定化剤、充填剤、滑剤、着色剤（染料など）、酸化防止剤、目ヤニ防止剤、アンチブロッキング剤、発泡剤、他のポリマー、粘着付与剤、可塑剤、劣化防止剤、帯電防止剤、光安定化剤などが挙げられる。これらは、１種のみであってもよいし、２種以上であってもよい。 The stretchable porous film of the present invention may contain any appropriate other component as long as the effects of the present invention are not impaired. These may be only one kind or two or more kinds. Such other components include, for example, ultraviolet absorbers, heat stabilizers, fillers, lubricants, colorants (dyes, etc.), antioxidants, anti-glare agents, antiblocking agents, foaming agents, and the like. Examples thereof include polymers, tackifiers, plasticizers, deterioration inhibitors, antistatic agents, and light stabilizers. These may be only one kind or two or more kinds.
　紫外線吸収剤としては、例えば、ベンゾトリアゾール系化合物、ベンゾフェノン系化合物、ベンゾエート系化合物等が挙げられる。紫外線吸収剤の含有量は、成形時にブリードアウトしない限りにおいて、任意の適切な含有量を採用し得る。 Examples of the ultraviolet absorber include benzotriazole compounds, benzophenone compounds, benzoate compounds, and the like. Any appropriate content can be adopted as the content of the ultraviolet absorber as long as it does not bleed out during molding.
　耐熱安定化剤としては、例えば、ヒンダードアミン系化合物、リン系化合物およびシアノアクリレート系化合物等が挙げられる。耐熱安定化剤の含有量は、成形時にブリードアウトしない限りにおいて、任意の適切な含有量を採用し得る。 Examples of the heat stabilizer include hindered amine compounds, phosphorus compounds, and cyanoacrylate compounds. Any appropriate content can be adopted as the content of the heat-resistant stabilizer as long as it does not bleed out during molding.
≪伸縮性多孔質フィルムの製造≫
　本発明の伸縮性多孔質フィルムを製造する方法としては、本発明の効果を損なわない範囲で、任意の適切な方法を採用し得る。 ≪Manufacture of stretchable porous film≫
As a method for producing the stretchable porous film of the present invention, any appropriate method can be adopted as long as the effects of the present invention are not impaired.
　本発明の伸縮性多孔質フィルムを製造する方法としては、代表的には、Ｔダイ成形機を用いて成型して製造する方法が挙げられる。例えば、Ｔダイ成形機を用いて、本発明の伸縮性多孔質フィルムの材料を、Ｔダイから押出し、その後、ロール状に巻き取ることによって、伸縮性多孔質フィルムのロール体を製造することができる。Ｔダイを用いるＴダイ法以外に、インフレーション法なども採用し得る。 As a method for producing the stretchable porous film of the present invention, a method of producing by molding using a T-die molding machine is typical. For example, a roll body of a stretchable porous film can be produced by extruding the material of the stretchable porous film of the present invention from a T die using a T-die molding machine and then winding it into a roll. it can. In addition to the T-die method using a T-die, an inflation method or the like can be employed.
　本発明の伸縮性多孔質フィルムは、未延伸フィルムが延伸処理されたものであってもよい。このような、未延伸フィルムを延伸処理することを、事前伸長と称することがある。本発明の伸縮性多孔質フィルムは、未延伸フィルムが延伸処理されたものであることにより、より優れた伸縮性を発現し得る。また、本発明の伸縮性多孔質フィルムは、未延伸フィルムが延伸処理されたものであることにより、充填剤と組み合わせることで、優れた通気性をより発現し得る。 The stretchable porous film of the present invention may be obtained by stretching an unstretched film. Such stretching of an unstretched film may be referred to as pre-stretching. The stretchable porous film of the present invention can exhibit more excellent stretchability when the unstretched film is stretched. In addition, the stretchable porous film of the present invention is a film obtained by stretching an unstretched film, so that it can exhibit more excellent air permeability when combined with a filler.
　事前伸張は、本発明の伸縮性多孔質フィルムが最終利用において再度伸張されること（後伸長）に対して、予め伸張しておくという意味の事前伸張である。 Pre-stretching is pre-stretching in the sense that the stretchable porous film of the present invention is stretched in advance with respect to being stretched again in the final use (post-stretching).
　事前伸張は、好ましくは、本発明の伸縮性多孔質フィルムを製造して十分に固化した後に行う。 The pre-stretching is preferably performed after the elastic porous film of the present invention is produced and sufficiently solidified.
　事前伸張は、少なくとも１方向において、その元の長さまたは幅に対して全体に行っても良いし、部分的に行っても良い。また、事前伸張は、任意の方向に行うことができる。事前伸張は、好ましくは、少なくとも１方向において、その元の長さまたは幅に対して行う。 The pre-stretching may be performed for the entire length or width in at least one direction, or may be performed partially. The pre-stretching can be performed in any direction. Pre-stretching is preferably performed on its original length or width in at least one direction.
　事前伸張の伸長度合は、好ましくは１．５倍以上２．５倍未満（代表的には２．０倍）、より好ましくは２．５倍以上３．５倍未満（代表的には３．０倍）、さらに好ましくは３．５倍以上４．５倍未満（代表的には４．０倍）、特に好ましくは４．５倍以上５．５倍未満（代表的には５．０倍）である。なお、例えば、２．０倍の事前伸長とは、原長をＬとしたときに２Ｌに伸長（延伸と称する場合もある）することを意味する。このような伸長度合で事前伸張することにより、本発明の伸縮性多孔質フィルムは、より優れた伸縮性を発現し得る。また、このような伸長度合で事前伸張することにより、本発明の伸縮性多孔質フィルムは、充填剤と組み合わせることで、より優れた通気性を発現し得る。 The extension degree of the pre-extension is preferably 1.5 times or more and less than 2.5 times (typically 2.0 times), more preferably 2.5 times or more and less than 3.5 times (typically 3.times. 0 times), more preferably 3.5 times or more and less than 4.5 times (typically 4.0 times), particularly preferably 4.5 times or more and less than 5.5 times (typically 5.0 times) ). Note that, for example, the 2.0-fold pre-extension means that the original length is L, and the extension is 2 L (sometimes referred to as stretching). By pre-stretching at such a degree of stretching, the stretchable porous film of the present invention can exhibit more excellent stretchability. Moreover, the stretchable porous film of this invention can express the more outstanding air permeability by combining with a filler by extending | stretching beforehand by such an elongation degree.
　事前伸張は、好ましくは、ポリマー成分の融点未満の温度で実施される。このような温度で事前伸張することにより、本発明の伸縮性多孔質フィルムは、より優れた伸縮性を発現し得る。また、このような温度で事前伸張することにより、本発明の伸縮性多孔質フィルムは、充填剤と組み合わせることで、より優れた通気性を発現し得る。 Pre-extension is preferably performed at a temperature below the melting point of the polymer component. By pre-stretching at such a temperature, the stretchable porous film of the present invention can exhibit more excellent stretchability. In addition, by pre-stretching at such a temperature, the stretchable porous film of the present invention can exhibit better air permeability when combined with a filler.
　本発明の伸縮性多孔質フィルムは、好ましくは、このように事前伸張させることにより、ポリマー成分が塑性変形したりポリマーの脆性破壊点を超えて伸長されたりして、優れた伸縮性を発現し得る。 The stretchable porous film of the present invention preferably exhibits excellent stretchability because the polymer component is plastically deformed or stretched beyond the brittle fracture point of the polymer by pre-stretching in this way. obtain.
≪伸縮性多孔質フィルムの用途≫
　本発明の伸縮性多孔質フィルムは、本発明の効果を有効に利用できる任意の適切な物品に用いることができる。すなわち、本発明の物品は、本発明の伸縮性多孔質フィルムを含む。このような物品としては、代表的には、例えば、絆創膏などが挙げられる。 ≪Use of stretchable porous film≫
The stretchable porous film of the present invention can be used for any appropriate article that can effectively use the effects of the present invention. That is, the article of the present invention includes the stretchable porous film of the present invention. A typical example of such an article is an adhesive bandage.
　以下、実施例により本発明を具体的に説明するが、本発明はこれら実施例になんら限定されるものではない。なお、実施例等における、試験および評価方法は以下のとおりである。また、特に断りがない限り、部は重量部を意味し、％は重量％を意味する。 Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited to these examples. In addition, the test and evaluation method in an Example etc. are as follows. Moreover, unless otherwise indicated, a part means a weight part and% means weight%.
＜透気度＞
　透気度は、王研式透気度計（ｓｅｃ／１００ｃｃ）（旭精工株式会社製、商品名：ＥＧ０１－７－７ＭＲ）を用いて測定した。９９９９９ｓｅｃ／１００ｃｃを超えるものについては「通気性無し」と判断した。透気度の測定は、製造したフィルムをそのままの状態（通常状態）と、１００％伸長した状態と、２種類の測定を行った。なお、１００％伸長した状態の測定については、製造したフィルムが一軸延伸されたフィルムである場合は、該延伸の方向と直交する方向（長手（ＭＤ）方向に延伸した場合はＣＤ方向）に伸長した。 <Air permeability>
The air permeability was measured using an Oken type air permeability meter (sec / 100cc) (manufactured by Asahi Seiko Co., Ltd., trade name: EG01-7-7MR). Those exceeding 99999 sec / 100 cc were judged as “no breathability”. The air permeability was measured by measuring the produced film as it was (normal state) and 100% stretched state. In addition, about the measurement of the state extended | stretched 100%, when the manufactured film is a uniaxially stretched film, it extends | stretches in the direction (CD direction when extending | stretching to a longitudinal (MD) direction) orthogonal to the direction of this extending | stretching. did.
＜残留歪み＞
　図３に示すようなヒステリシス試験を、幅２０ｍｍの試験片について、チャック間距離３０ｍｍから、引張速度５０ｍｍ／分にてチャック間距離６０ｍｍまで引張り、１分間保持した後、チャック間距離の引張りをなくすまで行い、チャック間距離の引張りをなくしたときの残留歪みを測定した。なお、残留歪みの測定については、製造したフィルムが一軸延伸されたフィルムである場合は、引張り方向を、該延伸の方向と直交する方向（長手（ＭＤ）方向に延伸した場合はＣＤ方向）とした。 <Residual strain>
A hysteresis test as shown in FIG. 3 is performed on a test piece having a width of 20 mm, from a distance between chucks of 30 mm to a distance between chucks of 60 mm at a pulling speed of 50 mm / min, held for 1 minute, and then the tension between the chucks is eliminated. The residual strain when the tension between the chucks was removed was measured. Regarding the measurement of residual strain, when the produced film is a uniaxially stretched film, the tensile direction is the direction orthogonal to the direction of the stretching (CD direction when stretched in the longitudinal (MD) direction). did.
＜浸軟現象の評価＞
　日本ゼオン株式会社製のクインタック３４３３Ｎを１００部、ヤスハラケミカル株式会社製のクリアロンＭ１０５を５０部、ヤスハラケミカル株式会社製のＹＳレジンＴＯ－Ｌを１５０部を混練し、ホットメルト粘着剤（Ａ）を調製した。
　評価するフィルムの片面に上記ホットメルト粘着剤（Ａ）をスプレー塗布し、ＣＤ方向８０ｍｍ×長手方向２０ｍｍにカットし、指先に巻き付け、２４時間後の巻き付け部の皮膚の状態を観察し、下記の基準で評価した。
皮膚が通常と変わらない場合：○
皮膚が白くなっている場合：× <Evaluation of maceration phenomenon>
Prepare 100 parts of Quintac 3433N manufactured by Nippon Zeon Co., Ltd., 50 parts of Clearon M105 manufactured by Yasuhara Chemical Co., Ltd., and 150 parts of YS Resin TO-L manufactured by Yasuhara Chemical Co., Ltd. to prepare a hot melt adhesive (A). did.
The hot melt pressure-sensitive adhesive (A) is spray-coated on one side of the film to be evaluated, cut into a CD direction of 80 mm × longitudinal direction of 20 mm, wrapped around a fingertip, and observed for the state of the skin at the wound part after 24 hours. Evaluated by criteria.
If the skin is not normal: ○
If skin is white: ×
＜関節への追従性試験＞
（指関節）
　評価するフィルムの片面に上記ホットメルト粘着剤（Ａ）をスプレー塗布し、ＣＤ方向８０ｍｍ×長手方向２０ｍｍにカットし、指先の第二関節に巻き付け、該関節を５分間屈曲した後の状態を観察し、下記の基準で評価した。
指とフィルムの間に隙間がない場合：○
フィルムが伸びきって、指とフィルムの間に隙間がある場合：○
（ひじ関節）
　評価するフィルムの片面に上記ホットメルト粘着剤（Ａ）をスプレー塗布し、ＣＤ方向１３０ｍｍ×長手方向９５ｍｍにカットし、ひじに巻き付け、該ひじを５分間屈曲した後の状態を観察し、下記の基準で評価した。
ひじとフィルムの間に隙間がない場合：○
フィルムが伸びきって、ひじとフィルムの間に隙間がある場合：○ <Followability test for joints>
(Finger joint)
Spray the hot melt adhesive (A) on one side of the film to be evaluated, cut it into CD direction 80mm x longitudinal direction 20mm, wrap it around the second joint of the fingertip, and observe the state after bending the joint for 5 minutes And evaluated according to the following criteria.
If there is no gap between the finger and the film: ○
When the film is fully extended and there is a gap between the finger and the film: ○
(Elbow joint)
The hot melt pressure-sensitive adhesive (A) is spray-coated on one side of the film to be evaluated, cut into a CD direction of 130 mm × longitudinal direction of 95 mm, wound around the elbow, and observed after bending the elbow for 5 minutes. Evaluated by criteria.
If there is no gap between the elbow and the film: ○
When the film is fully extended and there is a gap between the elbow and the film: ○
〔実施例１〕
　メタロセンポリプロピレン系エラストマー（エクソンモービル社製、商品名：ビスタマックス７０１０、密度＝０．８６１ｇ／ｃｍ３、ＭＦＲ＝３ｇ／１０分）：１４０重量部、炭酸カルシウム（平均粒子径＝１．１μｍ）：２００重量部、ステアリン酸：１重量部、酸化防止剤：１重量部を、１８０℃で溶融混練し、混合材料を得た。
　得られた混合材料を押出機に投入し、Ｔダイから溶融押出を行い、１軸ロール延伸方式により、延伸温度６０℃、延伸倍率４倍で長手（ＭＤ）方向に延伸して、厚みが１００μｍの伸縮性多孔質フィルム（１）を得た。
　結果を表１に示した。 [Example 1]
Metallocene polypropylene-based elastomer (ExxonMobil, trade name: Vistamax 7010, density = 0.661 g / cm 3 , MFR = 3 g / 10 min): 140 parts by weight, calcium carbonate (average particle size = 1.1 μm): 200 parts by weight, stearic acid: 1 part by weight, and antioxidant: 1 part by weight were melt-kneaded at 180 ° C. to obtain a mixed material.
The obtained mixed material is put into an extruder, melt-extruded from a T-die, stretched in the longitudinal (MD) direction at a stretching temperature of 60 ° C. and a stretching ratio of 4 times by a uniaxial roll stretching method, and has a thickness of 100 μm. The elastic porous film (1) was obtained.
The results are shown in Table 1.
〔実施例２〕
　メタロセンポリプロピレン系エラストマー（エクソンモービル社製、商品名：ビスタマックス７０１０、密度＝０．８６１ｇ／ｃｍ３、ＭＦＲ＝３ｇ／１０分）：１４０重量部の代わりに、メタロセンポリプロピレン系エラストマー（エクソンモービル社製、商品名：ビスタマックス７０１０、密度＝０．８６１ｇ／ｃｍ３、ＭＦＲ＝３ｇ／１０分）：９８重量部、直鎖状低密度ポリエチレン（株式会社プライムポリマー製、商品名：ウルトゼックス２０２２Ｌ、密度＝０．９１９ｇ／ｃｍ３、ＭＦＲ＝２ｇ／１０分）：４２重量部とした以外は、実施例１と同様に行い、厚みが１００μｍの伸縮性多孔質フィルム（２）を得た。
　結果を表１に示した。 [Example 2]
Metallocene polypropylene-based elastomer (ExxonMobil, product name: Vistamax 7010, density = 0.661 g / cm 3 , MFR = 3 g / 10 min): metallocene polypropylene-based elastomer (ExxonMobil, manufactured by ExxonMobil) , Trade name: Vistamax 7010, density = 0.661 g / cm 3 , MFR = 3 g / 10 min): 98 parts by weight, linear low-density polyethylene (manufactured by Prime Polymer Co., Ltd., trade name: ULTZEX 2022L, density) = 0.919 g / cm 3 , MFR = 2 g / 10 min): Except for using 42 parts by weight, the same procedure as in Example 1 was performed to obtain a stretchable porous film (2) having a thickness of 100 µm.
The results are shown in Table 1.
〔実施例３〕
　メタロセンポリプロピレン系エラストマー（エクソンモービル社製、商品名：ビスタマックス７０１０、密度＝０．８６１ｇ／ｃｍ３、ＭＦＲ＝３ｇ／１０分）：１４０重量部の代わりに、メタロセンポリプロピレン系エラストマー（エクソンモービル社製、商品名：ビスタマックス７０１０、密度＝０．８６１ｇ／ｃｍ３、ＭＦＲ＝３ｇ／１０分）：７７重量部、直鎖状低密度ポリエチレン（株式会社プライムポリマー製、商品名：ウルトゼックス２０２２Ｌ、密度＝０．９１９ｇ／ｃｍ３、ＭＦＲ＝２ｇ／１０分）：６３重量部とした以外は、実施例１と同様に行い、厚みが１００μｍの伸縮性多孔質フィルム（３）を得た。
　結果を表１に示した。 Example 3
Metallocene polypropylene-based elastomer (ExxonMobil, product name: Vistamax 7010, density = 0.661 g / cm 3 , MFR = 3 g / 10 min): metallocene polypropylene-based elastomer (ExxonMobil, manufactured by ExxonMobil) , Trade name: Vistamax 7010, density = 0.661 g / cm 3 , MFR = 3 g / 10 min): 77 parts by weight, linear low-density polyethylene (manufactured by Prime Polymer Co., Ltd., trade name: ULTZEX 2022L, density) = 0.919 g / cm 3 , MFR = 2 g / 10 min): Except for setting to 63 parts by weight, the same procedure as in Example 1 was performed to obtain a stretchable porous film (3) having a thickness of 100 µm.
The results are shown in Table 1.
〔比較例１〕
　メタロセンポリプロピレン系エラストマー（エクソンモービル社製、商品名：ビスタマックス７０１０、密度＝０．８６１ｇ／ｃｍ３、ＭＦＲ＝３ｇ／１０分）：１４０重量部の代わりに、直鎖状低密度ポリエチレン（株式会社プライムポリマー製、商品名：ウルトゼックス２０２２Ｌ、密度＝０．９１９ｇ／ｃｍ３、ＭＦＲ＝２ｇ／１０分）：６３重量部、エチレン・プロピレン・ターポリマー（三井化学株式会社製、商品名：Ｋ－９７２０、ＭＦＲ＝２ｇ／１０分）：７７重量部とした以外は、実施例１と同様に行い、厚みが１００μｍの伸縮性多孔質フィルム（Ｃ１）を得た。
　結果を表２に示した。 [Comparative Example 1]
Metallocene polypropylene-based elastomer (ExxonMobil, trade name: Vistamax 7010, density = 0.661 g / cm 3 , MFR = 3 g / 10 min): linear low density polyethylene (Co., Ltd.) instead of 140 parts by weight Made of Prime Polymer, trade name: Ulto-Zex 2022L, density = 0.919 g / cm 3 , MFR = 2 g / 10 min): 63 parts by weight, ethylene propylene terpolymer (manufactured by Mitsui Chemicals, trade name: K- 9720, MFR = 2 g / 10 min): Except for using 77 parts by weight, the same procedure as in Example 1 was performed to obtain a stretchable porous film (C1) having a thickness of 100 μm.
The results are shown in Table 2.
〔比較例２〕
　メタロセンポリプロピレン系エラストマー（エクソンモービル社製、商品名：ビスタマックス７０１０、密度＝０．８６１ｇ／ｃｍ３、ＭＦＲ＝３ｇ／１０分）：１４０重量部の代わりに、直鎖状低密度ポリエチレン（株式会社プライムポリマー製、商品名：ウルトゼックス２０２２Ｌ、密度＝０．９１９ｇ／ｃｍ３、ＭＦＲ＝２ｇ／１０分）：６３重量部、α－オレフィン共重合体（三井化学株式会社製、商品名：タフマーＰＮ－３５６０、ＭＦＲ＝６ｇ／１０分）：７７重量部とした以外は、実施例１と同様に行い、厚みが１００μｍの伸縮性多孔質フィルム（Ｃ２）を得た。
　結果を表２に示した。 [Comparative Example 2]
Metallocene polypropylene-based elastomer (ExxonMobil, trade name: Vistamax 7010, density = 0.661 g / cm 3 , MFR = 3 g / 10 min): linear low density polyethylene (Co., Ltd.) instead of 140 parts by weight Made of Prime Polymer, trade name: Ultozex 2022L, density = 0.919 g / cm 3 , MFR = 2 g / 10 min): 63 parts by weight, α-olefin copolymer (manufactured by Mitsui Chemicals, trade name: TAFMER PN −3560, MFR = 6 g / 10 min): Except for using 77 parts by weight, the same procedure as in Example 1 was performed to obtain a stretchable porous film (C2) having a thickness of 100 μm.
The results are shown in Table 2.
〔比較例３〕
　メタロセンポリプロピレン系エラストマー（エクソンモービル社製、商品名：ビスタマックス７０１０、密度＝０．８６１ｇ／ｃｍ３、ＭＦＲ＝３ｇ／１０分）：１４０重量部の代わりに、メタロセンポリプロピレン系エラストマー（エクソンモービル社製、商品名：ビスタマックス６２０２、密度＝０．８６３ｇ／ｃｍ３、ＭＦＲ＝２０ｇ／１０分）：９８重量部、直鎖状低密度ポリエチレン（株式会社プライムポリマー製、商品名：ウルトゼックス２０２２Ｌ、密度＝０．９１９ｇ／ｃｍ３、ＭＦＲ＝２ｇ／１０分）：４２重量部とした以外は、実施例１と同様に行い、厚みが１００μｍの伸縮性多孔質フィルム（Ｃ３）を得た。
　結果を表２に示した。
　なお、伸縮性多孔質フィルム（Ｃ３）を作成するにあたっては、ロールへの粘り付きがひどく、作成が容易ではなかった。 [Comparative Example 3]
Metallocene polypropylene-based elastomer (ExxonMobil, product name: Vistamax 7010, density = 0.661 g / cm 3 , MFR = 3 g / 10 min): metallocene polypropylene-based elastomer (ExxonMobil, manufactured by ExxonMobil) , Trade name: Vistamax 6202, density = 0.863 g / cm 3 , MFR = 20 g / 10 min): 98 parts by weight, linear low-density polyethylene (manufactured by Prime Polymer Co., Ltd., trade name: ULTZEX 2022L, density) = 0.919 g / cm 3 , MFR = 2 g / 10 min): Except for using 42 parts by weight, the same procedure as in Example 1 was performed to obtain a stretchable porous film (C3) having a thickness of 100 μm.
The results are shown in Table 2.
In producing the stretchable porous film (C3), the sticking to the roll was so severe that the production was not easy.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　本発明の伸縮性多孔質フィルムは、本発明の効果を有効に利用できる任意の適切な物品に用いることができる。すなわち、本発明の物品は、本発明の伸縮性多孔質フィルムを含む。このような物品としては、代表的には、例えば、絆創膏などが挙げられる。 The stretchable porous film of the present invention can be used for any appropriate article that can effectively use the effects of the present invention. That is, the article of the present invention includes the stretchable porous film of the present invention. A typical example of such an article is an adhesive bandage.
ポリマー成分　　１０
充填剤　　　　　　　２０
空隙　　　　　　　　３０
伸縮性多孔質フィルム　　１００ Polymer component 10
Filler 20
Air gap 30
Elastic porous film 100

Claims (20)

  1. 　表面に空隙を有する伸縮性多孔質フィルムであって、
    　王研式透気度計により測定される透気度が９９９９９ｓｅｃ／１００ｃｃ未満であり、
    　１００％伸長した状態での王研式透気度計により測定される透気度が６００００ｓｅｃ／１００ｃｃ未満となる伸長方向を有し、
    　ヒステリシス試験において、幅２０ｍｍ、チャック間距離３０ｍｍから、引張速度５０ｍｍ／分にてチャック間距離６０ｍｍまで引張り、１分間保持した後、チャック間距離の引張りをなくしたときの残留歪みが１０ｍｍ以下となる引張り方向を有する、
    　伸縮性多孔質フィルム。     A stretchable porous film having voids on the surface,
    The air permeability measured by the Oken air permeability meter is less than 99999 sec / 100 cc,
    The air permeability measured by the Oken air permeability meter in a state of 100% extension has an extension direction that is less than 60000 sec / 100 cc,
    In the hysteresis test, after pulling from a width of 20 mm and an inter-chuck distance of 30 mm to an inter-chuck distance of 60 mm at a pulling speed of 50 mm / min and holding for 1 minute, the residual strain when the inter-chuck distance is removed is 10 mm or less. Having a tensile direction,
    Elastic porous film.
  2. 　前記王研式透気度計により測定される透気度が６００００ｓｅｃ／１００ｃｃ未満である、請求項１に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 1, wherein the air permeability measured by the Oken air permeability meter is less than 60000 sec / 100 cc.
  3. 　前記王研式透気度計により測定される透気度が４００００ｓｅｃ／１００ｃｃ未満である、請求項２に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 2, wherein the air permeability measured by the Oken air permeability meter is less than 40000 sec / 100 cc.
  4. 　前記１００％伸長した状態での王研式透気度計により測定される透気度が３００００ｓｅｃ／１００ｃｃ未満である、請求項１に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 1, wherein the air permeability measured by the Oken air permeability meter in the 100% stretched state is less than 30000 sec / 100 cc.
  5. 　前記１００％伸長した状態での王研式透気度計により測定される透気度が５０００ｓｅｃ／１００ｃｃ未満である、請求項４に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 4, wherein the air permeability measured by the Oken air permeability meter in the 100% stretched state is less than 5000 sec / 100 cc.
  6. 　前記残留歪みが８ｍｍ～１ｍｍである、請求項１に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 1, wherein the residual strain is 8 mm to 1 mm.
  7. 　前記残留歪みが６ｍｍ～２ｍｍである、請求項６に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 6, wherein the residual strain is 6 mm to 2 mm.
  8. 　厚みが３０μｍ～３００μｍである、請求項１に記載の伸縮性多孔質フィルム。 2. The stretchable porous film according to claim 1, wherein the thickness is 30 μm to 300 μm.
  9. 　厚みが５０μｍ～１５０μｍである、請求項８に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 8, wherein the thickness is 50 μm to 150 μm.
  10. 　ポリマー成分と充填剤を含む、請求項１に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 1, comprising a polymer component and a filler.
  11. 　前記ポリマー成分がプロピレン系エラストマーを含む、請求項１０に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 10, wherein the polymer component includes a propylene-based elastomer.
  12. 　前記ポリマー成分中の前記プロピレン系エラストマーの含有割合が３０重量％～１００重量％である、請求項１１に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 11, wherein the content of the propylene-based elastomer in the polymer component is 30% by weight to 100% by weight.
  13. 　前記プロピレン系エラストマーのＭＦＲが０．１ｇ／１０分～１８ｇ／１０分である、請求項１１に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 11, wherein the propylene-based elastomer has an MFR of 0.1 g / 10 min to 18 g / 10 min.
  14. 　前記プロピレン系エラストマーのＭＦＲが２ｇ／１０分～５ｇ／１０分である、請求項１３に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 13, wherein the propylene-based elastomer has an MFR of 2 g / 10 min to 5 g / 10 min.
  15. 　前記プロピレン系エラストマーがメタロセン系エラストマーである、請求項１１に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 11, wherein the propylene elastomer is a metallocene elastomer.
  16. 　前記ポリマー成分が直鎖状低密度ポリエチレンを含む、請求項１０に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 10, wherein the polymer component comprises linear low-density polyethylene.
  17. 　前記ポリマー成分中の前記直鎖状低密度ポリエチレンの含有割合が５重量％～６０重量％である、請求項１６に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 16, wherein the content of the linear low-density polyethylene in the polymer component is 5 wt% to 60 wt%.
  18. 　前記充填剤が、無機粒子、有機粒子から選ばれる少なくとも１種である、請求項１０に記載の伸縮性多孔質フィルム。 The stretchable porous film according to claim 10, wherein the filler is at least one selected from inorganic particles and organic particles.
  19. 　請求項１に記載の伸縮性多孔質フィルムを含む物品。 An article comprising the stretchable porous film according to claim 1.
  20. 　粘着剤層を有する、請求項１９に記載の物品。
     

          The article of claim 19 having an adhesive layer.


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