CN116903958A - Stretchable porous film and article - Google Patents

Stretchable porous film and article Download PDF

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Publication number
CN116903958A
CN116903958A CN202310898756.1A CN202310898756A CN116903958A CN 116903958 A CN116903958 A CN 116903958A CN 202310898756 A CN202310898756 A CN 202310898756A CN 116903958 A CN116903958 A CN 116903958A
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China
Prior art keywords
stretchable porous
porous film
air permeability
stretchable
present application
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CN202310898756.1A
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Chinese (zh)
Inventor
武田安洋
重松義武
武田公平
内田翔
中川宗重
生岛伸祐
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Nitto Denko Corp
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Nitto Denko Corp
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Priority claimed from JP2015232629A external-priority patent/JP6726953B2/en
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Publication of CN116903958A publication Critical patent/CN116903958A/en
Pending legal-status Critical Current

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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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

Provided is a stretchable porous film having excellent stretchability and excellent breathability. Also provided is an article comprising the stretchable porous membrane. The stretchable porous membrane of the present application is a stretchable porous membrane having voids on its surface, wherein: an air permeability of less than 99,999sec/100cc as measured using an Wang Yan air permeability meter; the stretchable porous film has an elongation direction in which the air permeability is less than 60,000sec/100cc as measured using a Wang Yan air permeability meter in its 100% elongation state; and the stretchable porous film has a pulling direction in which the stretchable porous film is pulled from a width of 20mm and a chuck pitch of 30mm to a chuck pitch of 60mm at a pulling speed of 50mm/min for 1 minute and then the residual strain at the time of pulling of releasing the chuck pitch is 10mm or less in a hysteresis test.

Description

Stretchable porous film and article
The present application is a divisional application of the application having the application date of 2016, 4 and 12, the application number of 201680021971.1 and the name of "stretchable porous film and product".
Technical Field
The present application relates to a stretchable porous film and article.
Background
Various stretchable films are used for stretchable products such as sanitary products including plasters.
These stretch films are required to have not only excellent stretch properties but also excellent breathability in some applications. For example, a typical adhesive plaster of the prior art (for example, refer to patent document 1) has a degree of water repellency due to the use of polyvinyl chloride as the polymer component of the stretchable film of the adhesive plaster. However, this plaster has poor air permeability, and thus there is a problem that the skin of the plaster application portion becomes stuffiness and whitened during application of the plaster to the skin, and maceration occurs.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2000-167037
Disclosure of Invention
Problems to be solved by the application
The present application has been made to solve the problems of the prior art, and an object of the present application is to provide a stretchable porous membrane having excellent stretchability and excellent breathability. It is another object of the present application to provide an article comprising such a stretchable porous membrane.
Solution for solving the problem
The elastic porous film according to an embodiment of the present application has voids on its surface, wherein:
the stretchable porous film has an air permeability (air permeability) of less than 99,999sec/100cc as measured using a Wang Yan type air permeability meter;
the stretchable porous film has an elongation direction (extending direction) in which the air permeability measured using a Wang Yan air permeability meter in a state in which the stretchable porous film is 100% elongated is less than 60,000sec/100 cc; and
the stretchable porous film has a pulling direction (pulling direction) in which the stretchable porous film is pulled from a width of 20mm and a chuck pitch of 30mm to a chuck pitch of 60mm at a pulling speed of 50mm/min for 1 minute and then the residual strain at the time of pulling of the chuck pitch is released to 10mm or less in a hysteresis test.
In one embodiment, the air permeability is less than 60,000sec/100cc as measured using a Wang Yan air permeability meter.
In one embodiment, the air permeability is less than 40,000sec/100cc as measured using a Wang Yan air permeability meter.
In one embodiment, the breathable film has a permeability of less than 30,000sec/100cc as measured using a Wang Yan porosimeter in the 100% extended state.
In one embodiment, the breathable film has a permeability of less than 5,000sec/100cc as measured using a Wang Yan porosimeter in the 100% extended state.
In one embodiment, the residual strain is 8mm to 1mm.
In one embodiment, the residual strain is from 6mm to 2mm.
In one embodiment, the thickness of the stretchable porous membrane of the application is 30 μm to 300. Mu.m.
In one embodiment, the thickness of the stretchable porous membrane of the application is 50 μm to 150 μm.
In one embodiment, the stretch porous membrane of the present application comprises a polymer component and a filler.
In one embodiment, the polymer component comprises a propylene-based elastomer.
In one embodiment, the propylene-based elastomer is present in the polymer component in an amount of 30% to 100% by weight.
In one embodiment, the propylene-based elastomer has an MFR of 0.1g/10min to 18g/10min.
In one embodiment, the propylene-based elastomer has an MFR of 2g/10min to 5g/10min.
In one embodiment, the propylene-based elastomer comprises a metallocene-based elastomer.
In one embodiment, the polymer component comprises linear low density polyethylene.
In one embodiment, the linear low density polyethylene is present in the polymer component in an amount of 5 wt% to 60 wt%.
In one embodiment, the filler includes at least one selected from the group consisting of inorganic particles and organic particles.
An article according to one embodiment of the application comprises the stretch porous film of the application.
In one embodiment, the article of the present application further comprises a pressure sensitive adhesive layer.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present application, it is possible to provide a stretchable porous film having excellent stretchability and excellent breathability. Articles comprising such stretchable porous membranes may also be provided.
Drawings
Fig. 1 is a schematic plan view of an example of a stretchable porous membrane according to an embodiment of the application.
Fig. 2 is a schematic plan view of another example of a stretchable porous membrane according to an embodiment of the application.
Fig. 3 is a graph showing the relationship between stress and strain in a hysteresis test at the time of measuring residual strain.
Detailed Description
Flexible porous film
The elastic porous membrane of the present application is an elastic porous membrane having voids on the surface thereof. Since the stretchable porous film has voids on its surface, the stretchable porous film of the present application has excellent breathability.
The stretchable porous membrane of the present application has an air permeability of less than 99,999sec/100cc, preferably less than 80,000sec/100cc, more preferably less than 70,000sec/100cc, still more preferably less than 60,000sec/100cc, particularly preferably less than 50,000sec/100cc, and most preferably less than 40,000sec/100cc as measured using a Wang Yan air permeability meter. When the air permeability of the stretchable porous film of the present application measured using the Wang Yan air permeability meter falls within the above range, the stretchable porous film of the present application can have excellent air permeability.
The stretchable porous film of the present application has an elongation direction in which the air permeability measured in a 100% elongation state of the stretchable porous film using a Wang Yan air permeability meter is less than 60,000sec/100cc. The air permeability is preferably less than 50,000sec/100cc, more preferably less than 40,000sec/100cc, still more preferably less than 30,000sec/100cc, particularly preferably less than 10,000sec/100cc, most preferably less than 5,000sec/100cc. When the stretchable porous film of the present application has an elongation direction in which the air permeability measured using a Wang Yan air permeability meter in a 100% elongation state of the stretchable porous film falls within the above range, the stretchable porous film of the present application may have excellent air permeability in its elongated state.
The phrase "having an elongation direction" means that the stretchable porous film of the present application only needs to have an elongation direction in which at least one air permeability falls within the above-described range. When the stretchable porous film of the present application is an unstretched film, preferred examples of such stretching directions are typically all directions of the film, and when the stretchable porous film of the present application is a uniaxially stretched film, preferred examples thereof are directions perpendicular to the stretching direction (CD direction when the film is stretched in the length (MD) direction thereof). In addition, when the stretchable porous film of the present application is a biaxially stretched film, the direction of elongation in which the air permeability falls within the above range is determined according to various conditions such as whether stretching is simultaneous stretching or sequential stretching, difference in stretch ratio between two axes, and the like.
The stretchable porous film of the present application has a traction direction in which the residual strain is 10mm or less when the stretchable porous film is drawn from a width of 20mm and a chuck pitch of 30mm to a chuck pitch of 60mm at a drawing speed of 50mm/min and held for 1 minute and then the chuck pitch is released in a hysteresis test. The residual strain is preferably 9 to 1mm, more preferably 8 to 1mm, still more preferably 7 to 1mm, particularly preferably 6 to 2mm, most preferably 5 to 3mm. When the stretchable porous film of the present application has a traction direction in which the residual strain falls within the above range, the stretchable porous film of the present application may have excellent stretchability.
The phrase "having a traction direction" means that the stretchable porous film of the present application only needs to have a traction direction in which at least one residual strain falls within the above-described range. When the stretchable porous film of the present application is an unstretched film, a preferred example of such a pulling direction is typically the entire direction of the film, and when the stretchable porous film of the present application is a uniaxially stretched film, a preferred example thereof is a direction perpendicular to the direction of stretching (CD direction when the film is stretched in the length (MD) direction thereof). In addition, when the stretchable porous film of the present application is a biaxially stretched film, the stretching direction in which the residual strain falls within the above-described range is determined according to various conditions such as whether stretching is simultaneous stretching or sequential stretching, difference in stretching ratio between two axes, and the like.
The thickness of the stretchable porous membrane of the present application is preferably 30 μm to 300. Mu.m, more preferably 40 μm to 200. Mu.m, still more preferably 50 μm to 150. Mu.m, particularly preferably 60 μm to 140. Mu.m, and most preferably 70 μm to 120. Mu.m. When the thickness of the stretchable porous film of the present application falls within the above-described range, the stretchable porous film of the present application can have more excellent stretchability and more excellent breathability.
The stretchable porous membrane of the present application preferably comprises a polymer component and a filler.
Fig. 1 is a schematic plan view of an example of a stretchable porous membrane according to an embodiment of the application. In fig. 1, a stretchable porous membrane 100 includes a polymer component 10 and a filler 20.
Fig. 2 is a schematic plan view of another example of a stretchable porous membrane according to an embodiment of the application. In fig. 2, the stretchable porous membrane 100 comprises a polymer component 10 and a filler 20, and further comprises voids 30.
When the stretchable porous membrane of the present application is the embodiment shown in fig. 1, the stretchable porous membrane can be changed to the embodiment shown in fig. 2 by stretching. That is, when the stretchable porous membrane of the present application is the embodiment shown in fig. 1, appropriate voids can be generated on the surface of the stretchable porous membrane of the present application by stretching. By virtue of the moderate voids, the stretchable porous film of the present application can exhibit sufficient breathability. In addition, the stretchable porous film may have the same water repellency as that of the adhesive plaster typical in the related art.
In the case where the stretchable porous membrane of the present application is the embodiment shown in fig. 1, the stretchable porous membrane can exhibit excellent breathability even without elongation due to the presence of an interface between the polymer component and the filler by virtue of the presence of the filler.
The stretchable porous membrane of the present application may employ the embodiment shown in fig. 1 or the embodiment shown in fig. 2 depending on the performance required for the site where the stretchable porous membrane is used.
Any suitable polymer component may be employed as the polymer component in the elastic porous film of the present application within a range that does not impair the effects of the present application.
The polymer component preferably contains a propylene-based elastomer.
When the polymer component contains a propylene-based elastomer, the elastic porous film of the present application can exhibit more excellent stretchability. In addition, when the polymer component contains a propylene-based elastomer, the stretchable porous film of the present application can exhibit more excellent breathability by being combined with a filler.
The propylene-based elastomer may be only 1 type of elastomer, or may be 2 or more types of elastomers.
When the elastic porous film of the present application contains a propylene-based elastomer, the thermal stability improves, whereby, for example, thermal degradation in producing the elastic porous film of the present application can be suppressed. In addition, when the elastic porous film of the present application contains a propylene-based elastomer, the storage stability improves, whereby the fluctuation of the physical property values during storage of the elastic porous film of the present application can be suppressed.
When the elastic porous film of the present application contains a propylene-based elastomer, the process for producing the elastic porous film of the present application can be simplified, and therefore the processing cost can be suppressed. This is because of the following reasons: when a propylene-based elastomer is used, extrusion molding can be performed at the time of producing the stretchable porous film of the present application, whereby the need for producing a master batch can be eliminated.
In order to further exhibit the effect of the present application, the content of the propylene-based elastomer in the polymer component is preferably 30 to 100% by weight, more preferably 40 to 95% by weight, still more preferably 50 to 90% by weight, particularly preferably 55 to 85% by weight, and most preferably 60 to 80% by weight. When the content of the propylene-based elastomer in the polymer component is set within the above range, the stretchable porous film of the present application can exhibit more excellent stretchability. In addition, when the content of the propylene-based elastomer in the polymer component is set within the above range, the stretchable porous film of the present application can exhibit more excellent breathability by combining with the filler.
Examples of the propylene-based elastomer include propylene copolymers, propylene olefin block copolymers, propylene olefin random copolymers, propylene ethylene olefin block copolymers, and amorphous polypropylene.
The propylene-based elastomer preferably has a density of 0.890g/cm 3 ～0.830g/cm 3 More preferably 0.888g/cm 3 ～0.835g/cm 3 Still more preferably 0.886g/cm 3 ～0.835g/cm 3 Particularly preferably 0.885g/cm 3 ～0.840g/cm 3 Most preferably 0.885g/cm 3 ～0.845g/cm 3 . When the density of the propylene-based elastomer is set within the above range, the stretchable porous film of the present application can exhibit more excellent stretchability. In addition, when the density of the propylene-based elastomer is set within the above range, the stretchable porous film of the present application can exhibit more excellent breathability by combining with the filler.
The MFR of the propylene-based elastomer at 230℃and 2.16kgf is preferably 0.1g/10min to 18g/10min, more preferably 0.5g/10min to 15g/10min, still more preferably 1.0g/10min to 10g/10min, particularly preferably 1.5g/10min to 7g/10min, most preferably 2g/10min to 5g/10min. When the MFR of the propylene-based elastomer is set within the above range, the stretchable porous film of the present application can exhibit more excellent stretchability. When the MFR of the propylene-based elastomer is set within the above range, the stretchable porous film of the present application can exhibit more excellent breathability by combining with the filler.
Propylene-based elastomers are also available as commercial products. Examples of such commercial products include some products in the "Tafmer" (registered trademark) series manufactured by Mitsui Chemicals, inc, and some products in the "Vistamaxx" (registered trademark) series manufactured by Exxon Mobil Corporation (e.g., vistamaxx 7010).
The propylene-based elastomer is preferably a metallocene-based elastomer (the propylene-based elastomer as a metallocene-based elastomer is sometimes referred to as "metallocene polypropylene-based elastomer"). The metallocene-based elastomer is an elastomer produced using a metallocene catalyst. When a metallocene-based elastomer is used as the propylene-based elastomer, the stretchable porous film of the present application can exhibit more excellent stretchability. In addition, when a metallocene-based elastomer is used as the propylene-based elastomer, the stretchable porous film of the present application can exhibit more excellent breathability by combining with a filler.
The polymer component preferably comprises linear low density polyethylene.
The elastic porous film of the present application can exhibit more excellent stretchability when the polymer component contains a propylene-based elastomer and a linear low-density polyethylene. In addition, when the polymer component contains a propylene-based elastomer and a linear low density polyethylene, the stretchable porous film of the application can exhibit more excellent breathability by combining with a filler.
The linear low density polyethylene may be only 1 polyethylene, or may be more than 2 polyethylenes.
When the elastic porous film of the present application contains a propylene-based elastomer and a linear low density polyethylene, the thermal stability improves, whereby, for example, thermal degradation in producing the elastic porous film of the present application can be suppressed. In addition, when the elastic porous film of the present application contains a propylene-based elastomer and a linear low-density polyethylene, the storage stability is improved, whereby variation in physical property values during storage of the elastic porous film of the present application can be suppressed.
When the stretchable porous film of the present application contains the propylene-based elastomer and the linear low-density polyethylene, the production process of the stretchable porous film of the present application can be simplified, and thus the processing cost can be suppressed. This is because of the following reasons: when a propylene-based elastomer and a linear low density polyethylene are employed, extrusion molding can be performed at the time of manufacturing the stretchable porous film of the application, and thus the need for manufacturing a masterbatch can be eliminated.
In order to further exhibit the effect of the present application, the content of the linear low density polyethylene in the polymer component is preferably 0 to 70% by weight, more preferably 5 to 60% by weight, still more preferably 10 to 50% by weight, particularly preferably 15 to 45% by weight, and most preferably 20 to 40% by weight. When the content of the linear low density polyethylene in the polymer component is set within the above range, the stretchable porous film of the present application can exhibit more excellent stretchability. In addition, when the content of the linear low density polyethylene in the polymer component is set within the above range, the stretchable porous film of the present application can exhibit more excellent breathability by being combined with the filler.
The density of the linear low density polyethylene is preferably 0.910g/cm 3 ～0.940g/cm 3 . When the density of the linear low density polyethylene is set within the above rangeThe stretchable porous membrane of the present application can exhibit more excellent stretchability. In addition, when the density of the linear low density polyethylene is set within the above range, the stretchable porous film of the present application can exhibit more excellent breathability by combining with the filler.
The MFR of the linear low density polyethylene at 230℃and 2.16kgf is preferably 1g/10min to 50g/10min. When the MFR of the linear low density polyethylene is set within the above range, the stretchable porous film of the present application can exhibit more excellent stretchability. In addition, when the MFR of the linear low density polyethylene is set within the above range, the stretchable porous film of the present application can exhibit more excellent breathability by combining with the filler.
Linear low density polyethylene is also available as a commercial product. Examples of such commercial products include some products in the "ULTZEX" (registered trademark) series manufactured by Prime Polymer co.
The linear low density polyethylene is preferably a metallocene-based linear low density polyethylene. Metallocene-based linear low density polyethylene is a linear low density polyethylene produced using a metallocene catalyst. When a metallocene-based linear low density polyethylene is used as the linear low density polyethylene, the stretchable porous film of the present application can exhibit more excellent stretchability. In addition, when a metallocene-based linear low density polyethylene is used as the linear low density polyethylene, the stretchable porous film of the present application can exhibit more excellent breathability by combining with a filler.
The stretchable porous membrane of the present application preferably comprises a filler. The filler is preferably at least one selected from inorganic particles and organic particles. The filler may be only 1 filler, or may be 2 or more fillers. When the stretchable porous film of the present application contains a filler, the stretchable porous film of the present application can exhibit more excellent breathability.
Examples of the inorganic particles include talc, titanium oxide, calcium oxide, magnesium oxide, zinc oxide, calcium carbonate, silica, clay, mica, barium sulfate, whiskers, and magnesium hydroxide.
Examples of the organic particles include acrylic beads (acrylic beads), styrene beads, and silicone resin particles.
Any suitable average particle diameter may be used as the average particle diameter of the filler within a range that does not impair the effects of the present application. The filler preferably has an average particle diameter of 0.5 μm to 50. Mu.m. The adjustment of the average particle diameter of the filler to the above range enables the elastic porous film of the present application to exhibit more excellent breathability.
Any suitable content may be employed as the content of the filler within a range that does not impair the effects of the present application. The content of the filler is preferably 50 to 400 parts by weight relative to 100 parts by weight of the polymer component in the stretchable porous film. The adjustment of the content of the filler within the above range enables the stretchable porous film of the present application to exhibit more excellent breathability.
The filler may be coated with a release agent for preventing aggregation. Examples of such release agents include fatty acid amide-based release agents, silicone-based release agents, fluorine-based release agents, and long-chain alkyl-based release agents. Among them, a fatty acid amide-based release agent is preferable, and a saturated fatty acid bisamide is more preferable. Any suitable amount may be used as the amount of the mold release agent.
The elastic porous film of the present application may contain any suitable other component within a range that does not impair the effects of the present application. The other components may be only 1 component, or may be 2 or more components. Examples of such other components include ultraviolet absorbers, heat stabilizers, fillers, lubricants, colorants (e.g., dyes), antioxidants, build up inhibitors (anti-blocking agents), antiblocking agents, foaming agents, other polymers, tackifiers, plasticizers, anti-deterioration agents, antistatic agents, and light stabilizers. These components may be used alone or in combination.
Examples of the ultraviolet absorber include benzotriazole-based compounds, benzophenone-based compounds, and benzoate-based compounds. Any suitable content may be used as the content of the ultraviolet absorber as long as the ultraviolet absorber does not bleed out during molding.
Examples of the heat stabilizer include hindered amine-based compounds, phosphorus-based compounds, and cyanoacrylate-based compounds. Any suitable amount may be used as the amount of the heat stabilizer as long as the heat stabilizer does not exude during molding.
Production of stretchable porous film
Any suitable method may be used as the method for producing the stretchable porous membrane of the present application within a range that does not impair the effects of the present application.
A typical example of the method for producing a stretchable porous membrane of the present application is a method involving molding a material for a stretchable porous membrane using a T-die molding machine to produce a stretchable porous membrane. For example, the tubular body of the stretchable porous membrane of the present application can be manufactured by: extruding a material for the stretchable porous film from its T die using a T die former; the extruded material is then rolled into a tube. In addition to the T-die method using a T-die, a inflation method or the like may be employed.
The stretchable porous film of the present application can be obtained by stretching an unstretched film. Such stretching treatment of the unstretched film may be referred to as "pre-stretching". When the stretchable porous film of the present application is obtained by subjecting an unstretched film to a stretching treatment, the stretchable porous film can exhibit more excellent stretchability. In addition, when the stretchable porous film of the present application is obtained by stretching an unstretched film, the stretchable porous film can further exhibit excellent breathability by combining with a filler.
The pre-elongation is a pre-elongation having the following meaning: the stretchable porous membrane of the present application is stretched in advance in consideration of the fact that the stretchable porous membrane is stretched again (post-stretched) at the time of its final use.
The pre-elongation is preferably performed after the stretchable porous membrane of the present application has been manufactured and sufficiently cured.
The pre-stretching may be performed in at least one direction for the entire original length or width, or may be performed for portions of the original length or width. In addition, the pre-elongation may be in any suitable direction. The pre-elongation is preferably performed in at least one direction for the original length or width.
The elongation of the pre-elongation 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 3.0 times), still 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). For example, a pre-elongation of 2.0 times means that when the original length of the stretchable porous membrane is denoted as L, the stretchable porous membrane is stretched (sometimes referred to as "stretched") to have a length of 2L. By pre-stretching to such an elongation, the stretchable porous film of the present application can exhibit more excellent stretchability. In addition, when the stretchable porous film of the present application is pre-stretched to such a stretched length, the stretchable porous film can exhibit more excellent breathability by combining with the filler.
The pre-elongation is preferably carried out at a temperature below the melting point of the polymer component. By performing the pre-stretching at such a temperature, the stretchable porous film of the present application can exhibit more excellent stretchability. In addition, when the stretchable porous film of the present application is pre-stretched at such a temperature, the stretchable porous film can exhibit more excellent breathability by combining with the filler.
When the stretchable porous membrane of the present application is preferably pre-stretched as described above, the polymer component is plastically deformed or stretched beyond the brittle fracture point of the polymer, whereby the stretchable porous membrane can exhibit excellent stretchability.
Use of stretchable porous film
The stretchable porous film of the present application can be used for any suitable article in which the effects of the present application can be effectively utilized. That is, the article of the present application comprises the stretchable porous film of the present application. A typical example of such an article is a plaster.
Examples
The present application is specifically illustrated by the following examples. However, the present application is by no means limited to these examples. The test and evaluation methods in examples and the like are as follows. In addition, "parts" means "parts by weight" and "%" means "% by weight" unless otherwise indicated.
< air permeability >
The air permeability was measured using a Wang Yan type air permeability meter (sec/100 cc) (manufactured by Asahi Seiko co., ltd., trade name: EG01-7-7 MR). A stretchable porous film having an air permeability of more than 99,999sec/100cc was judged as "air-impermeable". The following 2 air permeability measurements were performed: measuring the air permeability of the produced film in its existing state (normal state); the air permeability of the film at 100% elongation was measured. In the measurement of the 100% elongation state of the produced film, when the film is a uniaxially stretched film, the film is elongated in a direction perpendicular to the direction of stretching (CD direction when the film is stretched in the length (MD) direction thereof).
< residual Strain >
The hysteresis test shown in FIG. 3 was performed until a test piece having a width of 20mm was pulled from a chuck pitch of 30mm to a chuck pitch of 60mm at a pulling speed of 50mm/min for 1 minute, and then after the pulling of the chuck pitch was released, the residual strain at the time of pulling of the released chuck pitch was measured. In the measurement of the residual strain, when the produced film is a uniaxially stretched film, the film is drawn in a direction perpendicular to the direction of stretching (CD direction when the film is stretched in the length (MD) direction thereof).
< evaluation of maceration >
100 parts of QUINTAC 3433N manufactured by Zeon Corporation, 50 parts of Yasuhara Chemical co., ltd. CLEARON M105 manufactured by ltd. And 150 parts of Yasuhara Chemical co., ltd. YS rest TO-L were kneaded TO prepare a hot melt pressure sensitive adhesive (a).
The hot melt pressure sensitive adhesive (a) was applied to one surface of the film to be evaluated by spraying. The film was cut into sheets of 80mm in the CD direction and 20mm in the longitudinal direction, and the sheets were wound around fingertips. The skin state of the rolled portion of the sheet after 24 hours of rolling was observed and evaluated by the following criteria.
The condition of the skin remaining unchanged from its normal state: o (circle)
Skin blushing conditions: x-shaped glass tube
< test of following ability of Joint >
(finger joints)
The hot melt pressure sensitive adhesive (a) was applied to one surface of the film to be evaluated by spraying. The film was cut into sheets of 80mm in the CD direction x 20mm in the length direction and the sheets were wrapped around the second joint of the fingertip. The state after 5 minutes of bending of the joint was observed and evaluated by the following criteria.
No gap between finger and membrane: o (circle)
The film is fully elongated, so there is a gap between the finger and the film: x-shaped glass tube
(elbow joint)
The hot melt pressure sensitive adhesive (a) was applied to one surface of the film to be evaluated by spraying. The film was cut into 130mm CD by 95mm length sheets and the sheets were wound around the elbows. The elbow was observed and the state after bending for 5 minutes was evaluated by the following criteria.
No gap exists between the elbow and the membrane: o (circle)
The membrane is fully elongated, so there is a gap between the elbow and the membrane: x-shaped glass tube
Example 1
140 parts by weight of a metallocene polypropylene elastomer (manufactured by Exxon Mobil Corporation, trade name: vistamaxx 7010, density=0.861 g/cm) 3 Mfr=3 g/10 min), 200 parts by weight of calcium carbonate (average particle diameter=1.1 μm), 1 part by weight of stearic acid, and 1 part by weight of antioxidant were melt-kneaded at 180 ℃ to provide a mixed material.
The resulting mixed material was fed into an extruder and melt-extruded from its T-die. The extruded material was stretched in the direction of its length (MD) by uniaxial roller stretching at a stretching temperature of 60 ℃ and a stretching magnification of 4 times, thereby providing an elastic porous film (1) having a thickness of 100 μm.
The results are shown in Table 1.
Example 2
Except that 98 parts by weight of a metallocene polypropylene-based elastomer (manufactured by Exxon Mobil Corporation, trade name: vistamaxx 7010, density=0.861 g/cm) 3 Mfr=3 g/10 min) and 42 parts by weight of linear low density polyethylene (Prime Polymer co., ltd., manufactured by ltd., trade name: ULTZEX 2022L, density=0.919 g/cm 3 MFR=2g/10 min) instead of 140 parts by weight of metallocene polypropylene-based elastomer (Exxon MManufactured by obil Corporation, trade name: vistamaxx 7010, density=0.861 g/cm 3 Mfr=3 g/10 min), a stretchable porous film (2) having a thickness of 100 μm was obtained in the same manner as in example 1.
The results are shown in Table 1.
Example 3
Except that 77 parts by weight of a metallocene polypropylene-based elastomer (manufactured by Exxon Mobil Corporation, trade name: vistamaxx 7010, density=0.861 g/cm) 3 Mfr=3 g/10 min) and 63 parts by weight of linear low density polyethylene (Prime Polymer co., ltd., manufactured by ltd., trade name: ULTZEX 2022L, density=0.919 g/cm 3 Mfr=2 g/10 min) instead of 140 parts by weight of the metallocene polypropylene-based elastomer (manufactured by Exxon Mobil Corporation, trade name: vistamaxx 7010, density=0.861 g/cm 3 Mfr=3 g/10 min), a stretchable porous film (3) having a thickness of 100 μm was obtained in the same manner as in example 1.
The results are shown in Table 1.
Comparative example 1
Except that 63 parts by weight of linear low density polyethylene (Prime Polymer Co., ltd., trade name: ULTZEX 2022L, density=0.919 g/cm) was used 3 Mfr=2 g/10 min) and 77 parts by weight of an ethylene-propylene terpolymer (manufactured by Mitsui Chemicals, inc., trade name: k-9720, mfr=2g/10 min) instead of 140 parts by weight of the metallocene polypropylene-based elastomer (manufactured by Exxon Mobil Corporation, trade name: vistamaxx 7010, density=0.861 g/cm 3 Mfr=3 g/10 min), a stretchable porous film (C1) having a thickness of 100 μm was obtained in the same manner as in example 1.
The results are shown in Table 2.
Comparative example 2
Except that 63 parts by weight of linear low density polyethylene (Prime Polymer Co., ltd., trade name: ULTZEX 2022L, density=0.919 g/cm) was used 3 Mfr=2 g/10 min) and 77 parts by weight of an α -olefin copolymer (manufactured by Mitsui Chemicals, inc., trade name: tafmer PN-3560, MFR=6g/10 min) was used in place of 140 parts by weight of the metallocene polypropylene-based elastomer (manufactured by Exxon Mobil Corporation, trade name: vistamaxx 7010, density=0.861 g/cm 3 Mfr=3 g/10 min), a stretchable porous film (C2) having a thickness of 100 μm was obtained in the same manner as in example 1.
The results are shown in Table 2.
Comparative example 3
Except that 98 parts by weight of a metallocene polypropylene-based elastomer (manufactured by Exxon Mobil Corporation, trade name: vistamaxx 6202, density=0.863 g/cm) 3 Mfr=20 g/10 min) and 42 parts by weight of linear low density polyethylene (Prime Polymer co., ltd., manufactured by ltd., trade name: ULTZEX 2022L, density=0.919 g/cm 3 Mfr=2 g/10 min) instead of 140 parts by weight of the metallocene polypropylene-based elastomer (manufactured by Exxon Mobil Corporation, trade name: vistamaxx 7010, density=0.861 g/cm 3 Mfr=3 g/10 min), a stretchable porous film (C3) having a thickness of 100 μm was obtained in the same manner as in example 1.
The results are shown in Table 2.
In the production of the stretchable porous film (C3), the adhesion of the material for the stretchable porous film to the roll is very strong, so that the production is not easy.
TABLE 1
TABLE 2
Industrial applicability
The elastic porous film of the present application can be used for any suitable product that can effectively utilize the effects of the present application. That is, the article of the present application comprises the stretchable porous film of the present application. A typical example of such an article is a plaster.
List of reference numerals
10. Polymer component
20. Packing material
30. Void space
100. Stretchable porous film

Claims (13)

1. A stretchable porous membrane having voids on a surface thereof, wherein:
the stretchable porous membrane has an air permeability of less than 99,999sec/100cc as measured using a Wang Yan air permeability meter;
the stretchable porous film has an elongation direction in which the air permeability measured using a Wang Yan air permeability meter in a 100% elongation state of the stretchable porous film is less than 60,000sec/100 cc; and
the stretchable porous film has a traction direction in which the residual strain is 10mm or less when the stretchable porous film is drawn from a width of 20mm and a chuck pitch of 30mm to a chuck pitch of 60mm at a drawing speed of 50mm/min and held for 1 minute and then the chuck pitch is released in a hysteresis test,
the elastic porous membrane comprises a polymer component and a filler,
the polymer component contains a propylene-based elastomer,
the propylene-based elastomer comprises a metallocene-based elastomer,
the propylene elastomer has an MFR of 0.1g/10min to 18g/10min,
the content of the propylene-based elastomer in the polymer component is 40 to 100% by weight,
the polymer component contains 5 to 60 wt% of linear low density polyethylene.
2. The stretchable porous film according to claim 1 wherein the air permeability is less than 60,000sec/100cc as measured using a Wang Yan air permeability meter.
3. The stretchable porous film according to claim 2, wherein the air permeability measured using a Wang Yan air permeability meter is less than 40,000sec/100cc.
4. The stretchable porous film according to claim 1, wherein the stretchable porous film has an air permeability of less than 30,000sec/100cc as measured using a Wang Yan air permeability meter in a 100% extended state.
5. The stretchable porous film according to claim 4, wherein the stretchable porous film has an air permeability of less than 5,000sec/100cc as measured using a Wang Yan air permeability meter in a 100% extended state.
6. The stretchable porous membrane according to claim 1, wherein the residual strain is 8mm to 1mm.
7. The stretchable porous membrane according to claim 6, wherein the residual strain is 6mm to 2mm.
8. The stretchable porous membrane according to claim 1, wherein the thickness of the stretchable porous membrane is 30 μm to 300 μm.
9. The stretchable porous membrane according to claim 8, wherein the thickness of the stretchable porous membrane is 50 μm to 150 μm.
10. The stretchable porous film according to claim 1, wherein the propylene-based elastomer has an MFR of 2g/10min to 5g/10min.
11. The elastic porous film according to claim 1, wherein the filler contains at least one selected from inorganic particles and organic particles.
12. An article comprising the stretch porous film of claim 1.
13. The article of claim 12, further comprising a pressure sensitive adhesive layer.
CN202310898756.1A 2015-04-15 2016-04-12 Stretchable porous film and article Pending CN116903958A (en)

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