WO2021157724A1 - Stretchable film - Google Patents

Stretchable film Download PDF

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Publication number
WO2021157724A1
WO2021157724A1 PCT/JP2021/004425 JP2021004425W WO2021157724A1 WO 2021157724 A1 WO2021157724 A1 WO 2021157724A1 JP 2021004425 W JP2021004425 W JP 2021004425W WO 2021157724 A1 WO2021157724 A1 WO 2021157724A1
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WIPO (PCT)
Prior art keywords
elastomer
layer
surface layer
straight line
stretchable film
Prior art date
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PCT/JP2021/004425
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French (fr)
Japanese (ja)
Inventor
平野　達也
崇暁 前田
昭裕 田中
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タキロンシーアイ株式会社
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Publication of WO2021157724A1 publication Critical patent/WO2021157724A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • 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
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers

Definitions

  • the present invention relates to a stretchable film.
  • the present application claims priority based on Japanese Patent Application No. 2020-019609 filed in Japan on February 7, 2020, the contents of which are incorporated herein by reference.
  • Elastic films are used in a wide range of fields such as hygiene products, sporting goods, medical products, etc. to improve handleability, wearing feeling (fitting feeling), and the like.
  • used for clothing such as underwear, waistbands for disposable diapers, side panels, leg gathers, incontinence materials, sanitary napkins, bandages, surgical drapes, tightening bands, hats, swimming pants, sports supporters, medical supporters, etc.
  • a stretchable film in which a surface layer such as an olefin layer is provided on the surface of the elastomer layer has been proposed (Patent Document 1).
  • the stretchable film may be stretched and bonded to a non-woven fabric, a back film, or the like.
  • a conventional stretchable film such as Patent Document 1
  • An object of the present invention is to provide an elastic film that can be stably bonded to a non-woven fabric, a back film, or the like in a stretched state.
  • the present invention has the following configurations.
  • the elastic film according to [1] which has an elastomer layer and a surface layer provided on either or both of the first surface and the second surface of the elastomer layer.
  • an elastic film that can be stably bonded to a non-woven fabric, a back film, or the like in a stretched state.
  • the flow direction (MD) is the extrusion direction (longitudinal direction) of the strip-shaped resin film.
  • the width direction (TD) is a direction perpendicular to the flow direction (MD) along the resin film surface (a direction orthogonal to the MD in a plan view).
  • the stretchable film of the present invention contains an inorganic filler and a thermoplastic elastomer.
  • the inorganic filler is not particularly limited, and examples thereof include calcium carbonate, zeolite, and silica. Of these, calcium carbonate is preferable because it can reduce the stress during film elongation and improve the permanent strain (stretchability).
  • the inorganic filler contained in the elastic film may be one kind or two or more kinds.
  • Thermoplastic elastomer refers to a polymer that has rubber elasticity above the glass transition temperature. Therefore, thermoplastic elastomers generally have a glass transition temperature of room temperature (23 ° C.) or lower.
  • the thermoplastic elastomer include styrene-based elastomers, olefin-based elastomers, urethane-based elastomers, polyester-based elastomers, and the like.
  • olefin-based elastomers are preferable in terms of strength and resilience.
  • a styrene-based elastomer is preferable in terms of high dimensional stability during film transportation.
  • the thermoplastic elastomer contained in the elastic film may be one kind or two or more kinds.
  • styrene-based elastomer examples include styrene-isoprene-styrene block copolymer (SIS elastomer), styrene-isoprene block copolymer, styrene-butadiene-styrene block copolymer, styrene-butadiene block copolymer, and styrene-.
  • SIS elastomer styrene-isoprene-styrene block copolymer
  • SIS elastomer styrene-isoprene block copolymer
  • styrene-butadiene-styrene block copolymer examples include styrene-butadiene block copolymer, and styrene-.
  • Hydrogen additive of isoprene-styrene block copolymer (styrene-ethylene-propylene-styrene block copolymer), hydrogen additive of styrene-butadiene-styrene block copolymer (styrene-ethylene-butylene-styrene block copolymer) ) Etc.
  • SIS elastomers are preferable because they have higher strength and resilience.
  • the styrene unit content with respect to all units of the SIS elastomer is preferably 14 to 48% by mass.
  • the styrene unit content of the SIS elastomer is at least the above lower limit value, the moldability is improved.
  • the styrene unit content of the SIS elastomer is not more than the above upper limit value, sufficiently high elasticity can be obtained.
  • SIS elastomer a commercially available product can be used.
  • Commercially available SIS elastomers include, for example, Quintac3390 (SIS block copolymer, glass transition temperature: -53 ° C., styrene unit content: 48% by mass, manufactured by Nippon Zeon), Quintac3620 (SIS block copolymer, glass). Transition temperature: ⁇ 50 ° C., styrene unit content: 14% by mass, manufactured by Nippon Zeon Co., Ltd.) and the like.
  • the olefin-based elastomer examples include a copolymer or homopolymer containing an olefin having 3 or more carbon atoms as a main component, a copolymer with an olefin having 3 or more carbon atoms as a main component, and the like.
  • ⁇ -olefin copolymers such as propylene homopolymers and 1-butene copolymers having low stereoregularity; propylene-ethylene copolymers, propylene-ethylene-1-butene copolymers, etc.
  • elastomer in which the above-mentioned elastomer is dispersed in a matrix of crystalline polyolefin.
  • olefin elastomer may be used alone, or two or more types may be used in combination.
  • the olefin-based elastomer is also referred to as a "PP-based elastomer", such as a propylene-based copolymer (propylene-ethylene copolymer or the like), which is a copolymer containing propylene as a main component or a homopolymer from the viewpoint of strength and restorability. ),
  • An ethylene-octene elastomer (ethylene-octene copolymer, etc.) which is a copolymer containing ethylene as a main component or a homopolymer is preferable.
  • the PP-based elastomer is preferable because the difference in physical properties between the TD and the MD of the stretchable film is small and the permanent strain of the TD is improved.
  • the propylene unit content with respect to all the units of the PP-based elastomer is preferably 70 to 95% by mass, more preferably 80 to 90% by mass.
  • the propylene content of the PP-based elastomer is at least the lower limit, the moldability is improved.
  • the propylene content of the PP-based elastomer is not more than the upper limit, high elasticity can be easily obtained.
  • "-" indicating a numerical range means that the numerical values described before and after it are included as the lower limit value and the upper limit value.
  • olefin-based elastomer a commercially available product can be used.
  • examples of commercially available olefin elastomers include the trade name "VISTAMAX X6102" (propylene-ethylene copolymer, ethylene unit content: 16% by mass, manufactured by ExxonMobile) and the trade name "Infuse9007” (ethylene-octene copolymer). , Dow Chemical Co., Ltd.) and the like.
  • thermoplastic elastomer one selected from the group consisting of PP-based elastomers and ethylene-octene elastomers is preferable from the viewpoint of strength and resilience. However, two or more types of elastomers may be mixed and used. Further, as the thermoplastic elastomer, a styrene-based elastomer is preferable from the viewpoint of high dimensional stability during film transportation. However, two or more kinds of styrene-based elastomers may be mixed and used.
  • the molecular weight of the thermoplastic elastomer is not particularly limited as long as the requirements of the present invention can be achieved, but the melt flow rate (MFR) is preferably 1.0 g / 10 minutes to 25.0 g / 10 minutes. , More preferably 2.0 g / 10 minutes to 23.0 g / 10 minutes, further preferably 2.0 g / 10 minutes to 21.0 g / 10 minutes, and particularly preferably 2.0 g / 10 minutes to 20 minutes. It is 0.0 g / 10 minutes, most preferably 2.0 g / 10 minutes to 19.0 g / 10 minutes.
  • the measurement conditions can be appropriately selected according to the type of resin.
  • the test temperature is 200 ° C.
  • the test load is 5.0 kgf
  • the test temperature is 230 ° C.
  • the test is performed.
  • the load can be 2.16 kgf
  • the test temperature can be 190 ° C. and the test load can be 2.16 kgf.
  • the measurement points of the elongation ratios of 30%, 50%, and 70% on the hysteresis curve (stress-strain curve, SS curve) in which the stress at 0 to 100% elongation is measured are A, respectively.
  • B, and C the slope of the straight line p connecting the points A and B and the slope of the straight line q connecting the points B and C are both 7.0 ⁇ 10 -3 or less.
  • the stripe (distortion) of the stretchable film at the time of 100% elongation (extension ratio is 100%) is set to 100%.
  • the stretchable film can be stretched with a small force and a constant force. Therefore, the stretchable film can be stably bonded to other members such as a non-woven fabric and a back film in a stretched state, and the process stability is excellent.
  • the slope of the straight line p and the slope of the straight line q are both 5.0 ⁇ 10 -3 or less from the viewpoint of more excellent process stability.
  • the slope of the straight line p and the slope of the straight line q are both 3.9 ⁇ 10 -3 to 4.9 ⁇ 10 -3 . It is preferably 4.3 ⁇ 10 -3 to 4.8 ⁇ 10 -3 , and more preferably 4.3 ⁇ 10 -3 to 4.8 ⁇ 10 -3.
  • the stress at 30% elongation of the stretchable film is preferably 3.0 N / 25 mm or less, more preferably 2.0 N / 25 mm or less, and further preferably 1.7 N / 25 mm or less.
  • the stress at 100% elongation of the stretchable film is preferably 3.0 N / 25 mm or less, more preferably 2.0 N / 25 mm or less. If the stress at the time of 30% stretching and 100% stretching of the stretchable film is equal to or less than the upper limit value, the stretchable film has low rigidity.
  • the permanent strain of the stretchable film is preferably 30% or less, more preferably 20% or less, still more preferably 15% or less.
  • the permanent strain is not more than the upper limit value, the elasticity is excellent, and it is easy to return to the original state even after being bonded to another member such as a non-woven fabric in the stretched state.
  • the total thickness of the stretchable film is preferably 20 to 60 ⁇ m, more preferably 25 to 55 ⁇ m, and even more preferably 30 to 50 ⁇ m.
  • the stretchability is excellent.
  • the stretchable film is not more than the upper limit of the above range, the stretchable film can be thinned, the rigidity is lowered, and the stretchability is excellent.
  • the aspect of the elastic film of the present invention is not particularly limited, and includes an elastomer layer and a surface layer provided on either or both of the first surface and the second surface in the thickness direction of the elastomer layer. Aspects are preferred.
  • the stretchable film 1 illustrated in FIG. 1 and the stretchable film 2 illustrated in FIG. 2 can be mentioned.
  • the elastic film 1 includes an elastomer layer 10 and a first surface layer 20 provided on the first surface 10a of the elastomer layer 10.
  • the elastic film 2 is provided on the elastomer layer 10, the first surface layer 20 provided on the first surface 10a of the elastomer layer 10, and the second surface 10b of the elastomer layer 10.
  • a second surface layer 22 is provided.
  • the dimensions and the like in FIGS. 1 and 2 are examples, and the present invention is not necessarily limited thereto, and the present invention can be appropriately modified without changing the gist thereof.
  • the elastic film of the present invention may be a film having no surface layer on both the first surface and the second surface of the elastomer layer.
  • the elastomer layer is a layer containing a thermoplastic elastomer.
  • the elastomer layer may contain components other than the thermoplastic elastomer as long as the effects of the present invention are not impaired.
  • Other ingredients include, for example, weather stabilizers, antistatic agents, antifogging agents, metal soaps, waxes, antifungal agents, antibacterial agents, nucleating agents, flame retardants, UV absorbers, light stabilizers, antioxidants. Examples thereof include additives such as discoloration inhibitors, pigments, dyes and fillers, and resins other than thermoplastic elastomers such as polyolefin resins.
  • the content of the thermoplastic elastomer in the elastomer layer is preferably 80% by mass or more, more preferably 85% by mass or more, still more preferably 90% by mass or more, based on the total mass of the elastomer layer.
  • the content of the thermoplastic elastomer is at least the above lower limit value, the elasticity is excellent.
  • the thickness of the elastomer layer is preferably 20 to 60 ⁇ m, more preferably 25 to 55 ⁇ m, and even more preferably 30 to 50 ⁇ m.
  • the elastomer layer may be a single layer or a plurality of layers. When the elastomer layer is a multi-layer, it is preferable that the total thickness of the elastomer layers is in the above range.
  • the surface layer preferably contains a polyolefin resin and an inorganic filler from the viewpoint of excellent blocking resistance.
  • the polyolefin-based resin is a non-elastomeric olefin resin.
  • examples of the polyolefin resin include polypropylene, polyethylene and the like.
  • Polyethylene is preferable because it has excellent elasticity and low rigidity.
  • Polypropylene is preferable because it has excellent heat resistance and is not easily torn even when it is adhered to a non-woven fabric or the like by hot melt (110 ° C. or higher).
  • polypropylene examples include homopolypropylene (H-PP), block polypropylene (B-PP) which is a copolymer with ethylene, random polypropylene (R-PP) which is a copolymer with ethylene, and the like. Among them, one or more selected from the group consisting of B-PP and R-PP is preferable from the viewpoint of excellent flexibility.
  • polyethylene examples include low-density polyethylene (LDPE) and high-density polyethylene (HDPE).
  • the polyolefin-based resin contained in the surface layer may be one type or two or more types.
  • the polyolefin-based resin contained in the first surface layer and the polyolefin-based resin contained in the second surface layer may be the same or different. You may.
  • the content of the polyolefin resin in the surface layer is preferably 40 to 90% by mass, more preferably 50 to 70% by mass, based on the total mass of the surface layer.
  • the content of the polyolefin resin is at least the lower limit of the above range, the adhesiveness with the non-woven fabric is excellent.
  • the content of the polyolefin resin is not more than the upper limit of the above range, the rigidity is low and the elasticity is excellent.
  • the molecular weight of the polyolefin resin is not particularly limited as long as the requirements of the present invention can be achieved, but the melt flow rate (MFR) is preferably 1.0 g / 10 minutes to 25.0 g / 10 minutes.
  • the measurement conditions can be appropriately selected according to the type of resin.
  • the test temperature is 230 ° C. and the test load is 2.16 kgf
  • the test temperature is 190 ° C. and the test load is 2.16 kgf. Can be.
  • the inorganic filler examples include calcium carbonate, zeolite, silica, talc, alumina and the like.
  • the inorganic filler contained in the surface layer may be one kind or two or more kinds.
  • the content of the inorganic filler in the surface layer is preferably 10 to 60% by mass, more preferably 30 to 50% by mass, based on the total mass of the surface layer.
  • the content of the inorganic filler is at least the lower limit of the above range, the blocking resistance is excellent, the rigidity is low, and the elasticity is excellent.
  • the content of the inorganic filler is not more than the upper limit of the above range, the production of the stretchable film becomes stable.
  • the average particle size of the inorganic filler is preferably 1 ⁇ m to 15 ⁇ m, more preferably 2 ⁇ m to 8 ⁇ m.
  • the average particle size of the inorganic filler can be measured by laser diffraction.
  • the inorganic filler has a spherical shape or a shape similar thereto, its diameter (outer diameter) is defined as the particle diameter, and when the inorganic filler is an amorphous powder, the longest portion (major diameter) of the shape is defined as the particle diameter.
  • the average particle size is the median diameter (50% diameter).
  • the elastomer layer may also contain the above-mentioned inorganic filler, but the content of the inorganic filler in that case is preferably 1 to 10% by mass with respect to the total mass of the elastomer layer. More preferably ⁇ 5% by mass.
  • the surface layer may contain components other than the polyolefin resin and the inorganic filler as long as the effects of the present invention are not impaired.
  • Other components include, for example, the additives mentioned in the elastomer layer.
  • the thickness of the surface layer is preferably 0.5 to 4.0 ⁇ m, more preferably 1.0 to 3.0 ⁇ m.
  • the thickness of the surface layer is at least the lower limit of the above range, the production of the stretchable film becomes more stable.
  • the thickness of the surface layer is not more than the upper limit of the above range, the influence of the rigidity of the surface layer on the stretchable film is small, so that the rigidity of the stretchable film is low and the stretchability is excellent.
  • the first surface layer and the second surface layer are provided on both sides of the elastomer layer, it is preferable that the thickness of the first surface layer and the thickness of the second surface layer are within the above ranges, respectively.
  • the method for producing the stretchable film is not particularly limited, and examples thereof include an inflation method and a cast film process method. Of these, the cast film process method is preferable from the viewpoint of productivity.
  • the stretchable film of the present invention may be stretched for the purpose of adjusting mechanical properties, particularly shrinkage stress and permanent strain. Since the stress (rigidity) is reduced and a stretchable film having a straight line p slope and a straight line q slope of 7.0 ⁇ 10 -3 or less can be easily obtained, it is preferable that the stretching treatment is performed, and the stretching treatment is performed. It is more preferable that the TD) is stretched.
  • the stretching method is not particularly limited, and examples thereof include roll stretching, tenter stretching, and gear stretching. Of these, gear extension is preferable from the viewpoint of productivity.
  • the draw ratio is not particularly limited and can be, for example, 300 to 400%. When the draw ratio is in this range, it becomes easy to adjust the slope of the straight line p and the slope of the straight line q to 7.0 ⁇ 10 -3 or less.
  • the use of the elastic film of the present invention is not particularly limited, and can be used for sanitary goods, sports goods, medical goods, and the like.
  • used for clothing such as underwear, waistbands for disposable diapers, side panels, leg gathers, incontinence materials, sanitary napkins, bandages, surgical drapes, tightening bands, hats, swimming pants, sports supporters, medical supporters, etc. can.
  • both the inclination of the straight line p and the inclination of the straight line q are 7.0 ⁇ 10 -3 or less. Therefore, the stretchable film can be stretched with a small force and with a constant force, and the stretchable film can be stably bonded to other members such as a non-woven fabric and a back film in a stretched state, resulting in process stability. Excellent for.
  • Hysteresis curve Stretching ratio (%) when the test piece is immediately contracted at the same speed (254 mm / min) after stretching to a elongation ratio of 100% by the same method as when calculating the permanent strain of the stretchable film. Is called a hysteresis curve, and a curve obtained by plotting stress (N / 25 mm) on the horizontal axis and stress (N / 25 mm) on the vertical axis is called a hysteresis curve.
  • the process stability is the slope of the straight line p connecting the points A and B and the points B and the points when the measurement points of the hysteresis curve with the elongation ratios of 30%, 50%, and 70% are A, B, and C, respectively.
  • the slope of the straight line q connecting C was evaluated according to the following evaluation criteria. ⁇ (excellent): The slope of the straight line p and the slope of the straight line q are both 5.0 ⁇ 10 -3 or less. ⁇ (Good): At least one of the slope of the straight line p and the slope of the straight line q exceeds 5.0 ⁇ 10 -3 , but the slope of the straight line p and the slope of the straight line q are both 7.0 ⁇ 10 -3 or less. .. X (defective): At least one of the slope of the straight line p and the slope of the straight line q exceeds 7.0 ⁇ 10 -3.
  • the stretchable film is cut into strip-shaped test pieces of 100 mm in the TD of the film and 25 mm in the direction perpendicular to the TD (MD), and the test pieces are stretched in the longitudinal direction at a speed of 254 mm / min and an elongation ratio of 50%.
  • the bonding stability with and was evaluated according to the following evaluation criteria. ⁇ (Good): The bonding work was performed stably. ⁇ (defective): The bonding work could not be performed stably.
  • Example 1 Each component forming the surface layer was mixed with a tumbler mixer in the formulation shown in Table 1 to obtain a resin mixture.
  • An elastic film having one surface layer and a second surface layer provided on the third elastomer layer side was produced. After molding, the stretchable film was stretched 400% in the width direction (TD) by gear stretching.
  • Examples 2, 3, 5 to 8, Comparative Examples 3 to 7 An elastic film was produced in the same manner as in Example 1 except that the elastomer layer was used as one layer and the composition and thickness of each layer, the presence or absence of stretching treatment, and the conditions were changed as shown in Tables 1 and 2.
  • Example 4 Comparative Examples 1 and 2
  • An elastic film was produced in the same manner as in Example 1 except that the composition and thickness of each layer, the presence or absence of stretching treatment, and the conditions were changed as shown in Tables 1 and 2.
  • the stretchable films of Examples 1 to 8 were superior to the stretchable films of Comparative Examples 1 to 7 in process stability and bonding stability.

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Abstract

A stretchable film (2) contains an inorganic filler and a thermoplastic elastomer and has an elastomer layer (10) and a first surface layer (20) and a second surface layer (22) disposed on both of a first side (10a) and a second side (10b) of the elastomer layer (10). In an hysteresis curve provided by measuring the stress during a 0-100% elongation, and assigning A, B, and C to the measurement points at elongation ratios of 30%, 50%, and 70%, respectively, the slope of the straight line p connecting point A with point B and the slope of the straight line q connecting point B and point C are both less than or equal to 7.0 × 10-3.

Description

伸縮フィルムElastic film
　本発明は、伸縮フィルムに関する。
　本願は、２０２０年２月７日に日本に出願された特願２０２０－０１９６０９号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to a stretchable film.
The present application claims priority based on Japanese Patent Application No. 2020-019609 filed in Japan on February 7, 2020, the contents of which are incorporated herein by reference.
　伸縮フィルムは、衛生用品、スポーツ用品、医療用品等の広い分野において、取扱い性、着用感（フィット感）等を改善するために使用されている。例えば、下着等の衣服、紙おむつのウエストバンド、サイドパネル、レッグギャザー、失禁用品、生理用ナプキン、包帯、外科的ドレープ、締め付け用バンド、帽子、水泳パンツ、スポーツ用サポーター、医療品サポーター等に用いられている。
　伸縮フィルムとしては、エラストマー層の表面にオレフィン層等の表面層を設けた伸縮フィルムが提案されている（特許文献１）。 Elastic films are used in a wide range of fields such as hygiene products, sporting goods, medical products, etc. to improve handleability, wearing feeling (fitting feeling), and the like. For example, used for clothing such as underwear, waistbands for disposable diapers, side panels, leg gathers, incontinence materials, sanitary napkins, bandages, surgical drapes, tightening bands, hats, swimming pants, sports supporters, medical supporters, etc. Has been done.
As the stretchable film, a stretchable film in which a surface layer such as an olefin layer is provided on the surface of the elastomer layer has been proposed (Patent Document 1).
特開２０１６－１１２８７８号公報Japanese Unexamined Patent Publication No. 2016-11278
　例えば、紙おむつの製造工程では、伸縮フィルムを伸長した状態で不織布やバックフィルム等と貼り合わせることがある。しかし、特許文献１のような従来の伸縮フィルムでは、伸縮フィルムを伸長させてさせる際の力の調節が難しく、貼り合わせの不良や、貼り合わせに長時間を要する等の不利が生じ易く、そのため貼り合わせを安定して行うことが難しい。 For example, in the manufacturing process of disposable diapers, the stretchable film may be stretched and bonded to a non-woven fabric, a back film, or the like. However, with a conventional stretchable film such as Patent Document 1, it is difficult to adjust the force when the stretchable film is stretched, and disadvantages such as poor bonding and long bonding time are likely to occur. It is difficult to perform stable bonding.
　本発明は、伸長した状態での不織布やバックフィルム等との貼り合わせが安定して行える伸縮フィルムを提供することを目的とする。 An object of the present invention is to provide an elastic film that can be stably bonded to a non-woven fabric, a back film, or the like in a stretched state.
　本発明は、以下の構成を有する。
［１］無機充填剤と熱可塑性エラストマーとを含み、０～１００％伸長時の応力を測定したヒステリシスカーブにおける、伸長倍率が３０％、５０％、７０％の測定点をそれぞれＡ、Ｂ、Ｃとしたとき、点Ａと点Ｂを結ぶ直線ｐの傾きと、点Ｂと点Ｃを結ぶ直線ｑの傾きが共に７．０×１０－３以下である、伸縮フィルム。
［２］エラストマー層と、前記エラストマー層の第１の面及び第２の面のいずれか一方又は両方に設けられた表面層と、を有する、［１］に記載の伸縮フィルム。
［３］前記エラストマー層が熱可塑性エラストマーを含み、前記表面層がポリオレフィン系樹脂と無機充填剤を含む、［２］に記載の伸縮フィルム。
［４］前記エラストマー層中の前記熱可塑性エラストマーの含有量が、前記エラストマー層の総質量に対して８０質量％以上であり、前記表面層中の前記ポリオレフィン系樹脂の含有量が、前記表面層の総質量に対して４０～９０質量％であり、前記表面層中の前記無機充填剤の含有量が、前記表面層の総質量に対して１０～６０質量％である、［３］に記載の伸縮フィルム。
［５］総厚みが２０～６０μｍである、［１］～［４］のいずれかに記載の伸縮フィルム。
［６］前記表面層の厚みが０．５～４．０μｍである、［２］～［５］のいずれかに記載の伸縮フィルム。
［７］幅方向に延伸処理が施されている、［１］～［６］のいずれかに記載の伸縮フィルム。
［８］直線ｐの傾きと直線ｑの傾きが共に５．０×１０－３以下である、［１］～［７］のいずれかに記載の伸縮フィルム。
［９］直線ｐの傾きと直線ｑの傾きが共に３．９×１０－３～４．９×１０－３である、［１］～［７］のいずれかに記載の伸縮フィルム。
［１０］直線ｐの傾きと直線ｑの傾きが共に４．３×１０－３～４．８×１０－３である、［１］～［７］のいずれかに記載の伸縮フィルム。 The present invention has the following configurations.
[1] Measurement points A, B, and C at elongation ratios of 30%, 50%, and 70% on a hysteresis curve containing an inorganic filler and a thermoplastic elastomer and measuring stress at 0 to 100% elongation, respectively. Then, the inclination of the straight line p connecting the points A and B and the inclination of the straight line q connecting the points B and C are both 7.0 × 10 -3 or less.
[2] The elastic film according to [1], which has an elastomer layer and a surface layer provided on either or both of the first surface and the second surface of the elastomer layer.
[3] The stretchable film according to [2], wherein the elastomer layer contains a thermoplastic elastomer, and the surface layer contains a polyolefin resin and an inorganic filler.
[4] The content of the thermoplastic elastomer in the elastomer layer is 80% by mass or more with respect to the total mass of the elastomer layer, and the content of the polyolefin resin in the surface layer is the surface layer. [3], wherein the content of the inorganic filler in the surface layer is 10 to 60% by mass with respect to the total mass of the surface layer. Elastic film.
[5] The stretchable film according to any one of [1] to [4], which has a total thickness of 20 to 60 μm.
[6] The stretchable film according to any one of [2] to [5], wherein the surface layer has a thickness of 0.5 to 4.0 μm.
[7] The stretchable film according to any one of [1] to [6], which has been stretched in the width direction.
[8] The stretchable film according to any one of [1] to [7], wherein both the slope of the straight line p and the slope of the straight line q are 5.0 × 10 -3 or less.
[9] The stretchable film according to any one of [1] to [7], wherein both the slope of the straight line p and the slope of the straight line q are 3.9 × 10 -3 to 4.9 × 10 -3.
[10] The stretchable film according to any one of [1] to [7], wherein both the slope of the straight line p and the slope of the straight line q are 4.3 × 10 -3 to 4.8 × 10 -3.
　本発明によれば、伸長した状態での不織布やバックフィルム等との貼り合わせが安定して行える伸縮フィルムを提供できる。 According to the present invention, it is possible to provide an elastic film that can be stably bonded to a non-woven fabric, a back film, or the like in a stretched state.
本発明の伸縮フィルムの一例を示した断面図である。It is sectional drawing which showed an example of the elastic film of this invention. 本発明の伸縮フィルムの一例を示した断面図である。It is sectional drawing which showed an example of the elastic film of this invention.
　以下の用語の定義は、本明細書及び特許請求の範囲にわたって適用される。
　流れ方向（ＭＤ）は、帯状の樹脂フィルムの押出方向（長手方向）である。また、幅方向（ＴＤ）は、樹脂フィルム面に沿って流れ方向（ＭＤ）に対して垂直方向（平面視においてＭＤに対して直交する方向）である。 The definitions of the following terms apply throughout the specification and claims.
The flow direction (MD) is the extrusion direction (longitudinal direction) of the strip-shaped resin film. The width direction (TD) is a direction perpendicular to the flow direction (MD) along the resin film surface (a direction orthogonal to the MD in a plan view).
　本発明の伸縮フィルムは、無機充填剤と熱可塑性エラストマーとを含む。
　無機充填剤としては、特に限定されず、例えば、炭酸カルシウム、ゼオライト、シリカを例示できる。なかでも、フィルム伸長時の応力を低くでき、また永久ひずみ（伸縮性）が向上する点から、炭酸カルシウムが好ましい。伸縮フィルムに含まれる無機充填剤は、１種でもよく、２種以上でもよい。 The stretchable film of the present invention contains an inorganic filler and a thermoplastic elastomer.
The inorganic filler is not particularly limited, and examples thereof include calcium carbonate, zeolite, and silica. Of these, calcium carbonate is preferable because it can reduce the stress during film elongation and improve the permanent strain (stretchability). The inorganic filler contained in the elastic film may be one kind or two or more kinds.
　熱可塑性エラストマーとは、ガラス転移温度以上でゴム弾性を有するポリマーを指す。したがって、熱可塑性エラストマーは一般に常温（２３℃）以下のガラス転移温度を持つ。熱可塑性エラストマーとしては、例えば、スチレン系エラストマー、オレフィン系エラストマー、ウレタン系エラストマー、ポリエステル系エラストマー等が挙げられる。これらの中でも、強度及び復元性の点では、オレフィン系エラストマーが好ましい。また、フィルム搬送時の寸法安定性が高いという点では、スチレン系エラストマーが好ましい。伸縮フィルムに含まれる熱可塑性エラストマーは、１種でもよく、２種以上でもよい。 Thermoplastic elastomer refers to a polymer that has rubber elasticity above the glass transition temperature. Therefore, thermoplastic elastomers generally have a glass transition temperature of room temperature (23 ° C.) or lower. Examples of the thermoplastic elastomer include styrene-based elastomers, olefin-based elastomers, urethane-based elastomers, polyester-based elastomers, and the like. Among these, olefin-based elastomers are preferable in terms of strength and resilience. Further, a styrene-based elastomer is preferable in terms of high dimensional stability during film transportation. The thermoplastic elastomer contained in the elastic film may be one kind or two or more kinds.
　スチレン系エラストマーとしては、例えば、スチレン－イソプレン－スチレンブロック共重合体（ＳＩＳエラストマー）、スチレン－イソプレンブロック共重合体、スチレン－ブタジエン－スチレンブロック共重合体、スチレン－ブタジエンブロック共重合体、スチレン－イソプレン－スチレンブロック共重合体の水素添加物（スチレン－エチレン－プロピレン－スチレンブロック共重合体）、スチレン－ブタジエン－スチレンブロック共重合体の水素添加物（スチレン－エチレン－ブチレン－スチレンブロック共重合体）等が挙げられる。これらの中でも、強度及び復元性がより高いことから、ＳＩＳエラストマーが好ましい。 Examples of the styrene-based elastomer include styrene-isoprene-styrene block copolymer (SIS elastomer), styrene-isoprene block copolymer, styrene-butadiene-styrene block copolymer, styrene-butadiene block copolymer, and styrene-. Hydrogen additive of isoprene-styrene block copolymer (styrene-ethylene-propylene-styrene block copolymer), hydrogen additive of styrene-butadiene-styrene block copolymer (styrene-ethylene-butylene-styrene block copolymer) ) Etc. can be mentioned. Among these, SIS elastomers are preferable because they have higher strength and resilience.
　ＳＩＳエラストマーの全単位に対するスチレン単位含有率は、１４～４８質量％が好ましい。ＳＩＳエラストマーのスチレン単位含有率が前記下限値以上であれば、成形性が向上する。ＳＩＳエラストマーのスチレン単位含有率が前記上限値以下であれば、充分に高い伸縮性を得ることができる。 The styrene unit content with respect to all units of the SIS elastomer is preferably 14 to 48% by mass. When the styrene unit content of the SIS elastomer is at least the above lower limit value, the moldability is improved. When the styrene unit content of the SIS elastomer is not more than the above upper limit value, sufficiently high elasticity can be obtained.
　ＳＩＳエラストマーとしては、市販品を使用することができる。
　ＳＩＳエラストマーの市販品としては、例えば、Ｑｕｉｎｔａｃ３３９０（ＳＩＳブロック共重合体、ガラス転移温度：－５３℃、スチレン単位含有率：４８質量％、日本ゼオン社製）、Ｑｕｉｎｔａｃ３６２０（ＳＩＳブロック共重合体、ガラス転移温度：－５０℃、スチレン単位含有率：１４質量％、日本ゼオン社製）等が挙げられる。 As the SIS elastomer, a commercially available product can be used.
Commercially available SIS elastomers include, for example, Quintac3390 (SIS block copolymer, glass transition temperature: -53 ° C., styrene unit content: 48% by mass, manufactured by Nippon Zeon), Quintac3620 (SIS block copolymer, glass). Transition temperature: −50 ° C., styrene unit content: 14% by mass, manufactured by Nippon Zeon Co., Ltd.) and the like.
　オレフィン系エラストマーとしては、炭素数３以上のオレフィンを主成分とした共重合体又は単独重合体、並びにエチレンを主成分とした炭素数３以上のオレフィンとの共重合体等が挙げられる。具体的には、例えば、立体規則性が低いプロピレン単独重合体や１－ブテン単独重合体等のα－オレフィン単独重合体；プロピレン－エチレン共重合体、プロピレン－エチレン－１－ブテン共重合体、１－ブテン－エチレン共重合体、１－ブテン－プロピレン共重合体、４－メチルペンテン－１－プロピレン共重合体、４－メチルペンテン－１－１－ブテン共重合体、４－メチルペンテン－１－プロピレン－１－ブテン共重合体、プロピレン－１－ブテン共重合体、エチレン－プロピレン共重合体、エチレン－ヘキセン共重合体、エチレン－１－オクテン共重合体等のα－オレフィン共重合体；エチレン－プロピレン－エチリデンノルボルネン共重合体、エチレン－プロピレン－ブタジエン共重合体、エチレン－プロピレン－イソプレン共重合体等のエチレン－α－オレフィン－ジエン三元共重合体；等が挙げられる。また、結晶性ポリオレフィンのマトリクスに上記エラストマーが分散したエラストマーとしてもよい。オレフィン系エラストマーは、１種を単独で使用してもよく、２種以上を併用してもよい。 Examples of the olefin-based elastomer include a copolymer or homopolymer containing an olefin having 3 or more carbon atoms as a main component, a copolymer with an olefin having 3 or more carbon atoms as a main component, and the like. Specifically, for example, α-olefin copolymers such as propylene homopolymers and 1-butene copolymers having low stereoregularity; propylene-ethylene copolymers, propylene-ethylene-1-butene copolymers, etc. 1-butene-ethylene copolymer, 1-butene-propylene copolymer, 4-methylpentene-1-propylene copolymer, 4-methylpentene-1-1-butene copolymer, 4-methylpentene-1 Α-Olefin copolymers such as -propylene-1-butene copolymer, propylene-1-butene copolymer, ethylene-propylene copolymer, ethylene-hexene copolymer, ethylene-1-octene copolymer; Examples thereof include ethylene-α-olefin-diene ternary copolymers such as ethylene-propylene-ethylidene norbornene copolymers, ethylene-propylene-butadiene copolymers, and ethylene-propylene-isoprene copolymers. Further, it may be an elastomer in which the above-mentioned elastomer is dispersed in a matrix of crystalline polyolefin. One type of olefin elastomer may be used alone, or two or more types may be used in combination.
　オレフィン系エラストマーとしては、強度及び復元性の点から、プロピレンを主成分とした共重合体又は単独重合体であるプロピレン系エラストマー（プロピレン－エチレン共重合体等、以下「ＰＰ系エラストマー」ともいう。）、エチレンを主成分とした共重合体又は単独重合体であるエチレン－オクテンエラストマー（エチレン－オクテン共重合体等）が好ましい。ＰＰ系エラストマーは、伸縮フィルムのＴＤとＭＤの物性の差が小さく、ＴＤの永久ひずみが改善される点で好ましい。 The olefin-based elastomer is also referred to as a "PP-based elastomer", such as a propylene-based copolymer (propylene-ethylene copolymer or the like), which is a copolymer containing propylene as a main component or a homopolymer from the viewpoint of strength and restorability. ), An ethylene-octene elastomer (ethylene-octene copolymer, etc.) which is a copolymer containing ethylene as a main component or a homopolymer is preferable. The PP-based elastomer is preferable because the difference in physical properties between the TD and the MD of the stretchable film is small and the permanent strain of the TD is improved.
　ＰＰ系エラストマーの全単位に対するプロピレン単位含有率は、７０～９５質量％が好ましく、８０～９０質量％がより好ましい。ＰＰ系エラストマーのプロピレン含有率が下限値以上であれば、成形性が向上する。ＰＰ系エラストマーのプロピレン含有率が上限値以下であれば、高い伸縮性が得られやすい。
　なお、本明細書において、数値範囲を示す「～」は、その前後に記載された数値を下限値及び上限値として含むことを意味する。 The propylene unit content with respect to all the units of the PP-based elastomer is preferably 70 to 95% by mass, more preferably 80 to 90% by mass. When the propylene content of the PP-based elastomer is at least the lower limit, the moldability is improved. When the propylene content of the PP-based elastomer is not more than the upper limit, high elasticity can be easily obtained.
In addition, in this specification, "-" indicating a numerical range means that the numerical values described before and after it are included as the lower limit value and the upper limit value.
　オレフィン系エラストマーとしては、市販品を使用することができる。
　オレフィン系エラストマーの市販品としては、例えば、商品名「ＶＩＳＴＡＭＡＸＸ６１０２」（プロピレン－エチレン共重合体、エチレン単位含有率：１６質量％、ＥｘｘｏｎＭｏｂｉｌ社製）、商品名「Ｉｎｆｕｓｅ９００７」（エチレン－オクテン共重合体、Ｄｏｗ　Ｃｈｅｍｉｃａｌ社製）等が挙げられる。 As the olefin-based elastomer, a commercially available product can be used.
Examples of commercially available olefin elastomers include the trade name "VISTAMAX X6102" (propylene-ethylene copolymer, ethylene unit content: 16% by mass, manufactured by ExxonMobile) and the trade name "Infuse9007" (ethylene-octene copolymer). , Dow Chemical Co., Ltd.) and the like.
　熱可塑性エラストマーとしては、強度及び復元性の点から、ＰＰ系エラストマー及びエチレン－オクテンエラストマーからなる群から選ばれる１種が好ましい。しかしながら、２種以上のエラストマーを混合して使用してもよい。
　また、熱可塑性エラストマーとしては、フィルム搬送時の寸法安定性が高いという点から、スチレン系エラストマーが好ましい。しかしながら、２種以上のスチレン系エラストマーを混合して使用してもよい。　
　尚、熱可塑性エラストマーの分子量については、本発明の要件を達成し得る限り特に制限はないが、メルトフローレート（ＭＦＲ）が、好ましくは１．０ｇ／１０分～２５．０ｇ／１０分であり、より好ましくは２．０ｇ／１０分～２３．０ｇ／１０分であり、さらに好ましくは２．０ｇ／１０分～２１．０ｇ／１０分であり、特に好ましくは２．０ｇ／１０分～２０．０ｇ／１０分であり、最も好ましくは２．０ｇ／１０分～１９．０ｇ／１０分である。ここで、測定条件は樹脂の種類に応じて適宜選択することができ、例えば、スチレン系エラストマーの場合は試験温度２００℃、試験荷重５．０ｋｇｆ、プロピレン系エラストマーの場合は試験温度２３０℃、試験荷重２．１６ｋｇｆ、エチレン系エラストマーの場合は試験温度１９０℃、試験荷重２．１６ｋｇｆとすることができる。 As the thermoplastic elastomer, one selected from the group consisting of PP-based elastomers and ethylene-octene elastomers is preferable from the viewpoint of strength and resilience. However, two or more types of elastomers may be mixed and used.
Further, as the thermoplastic elastomer, a styrene-based elastomer is preferable from the viewpoint of high dimensional stability during film transportation. However, two or more kinds of styrene-based elastomers may be mixed and used.
The molecular weight of the thermoplastic elastomer is not particularly limited as long as the requirements of the present invention can be achieved, but the melt flow rate (MFR) is preferably 1.0 g / 10 minutes to 25.0 g / 10 minutes. , More preferably 2.0 g / 10 minutes to 23.0 g / 10 minutes, further preferably 2.0 g / 10 minutes to 21.0 g / 10 minutes, and particularly preferably 2.0 g / 10 minutes to 20 minutes. It is 0.0 g / 10 minutes, most preferably 2.0 g / 10 minutes to 19.0 g / 10 minutes. Here, the measurement conditions can be appropriately selected according to the type of resin. For example, in the case of a styrene-based elastomer, the test temperature is 200 ° C., the test load is 5.0 kgf, and in the case of the propylene-based elastomer, the test temperature is 230 ° C., and the test is performed. The load can be 2.16 kgf, and in the case of an ethylene-based elastomer, the test temperature can be 190 ° C. and the test load can be 2.16 kgf.
　本発明の伸縮フィルムは、０～１００％伸長時の応力を測定したヒステリシスカーブ（応力－歪み曲線、Ｓ－Ｓカーブ）における、伸長倍率が３０％、５０％、７０％の測定点をそれぞれＡ、Ｂ、Ｃとしたとき、点Ａと点Ｂを結ぶ直線ｐの傾きと、点Ｂと点Ｃを結ぶ直線ｑの傾きが共に７．０×１０－３以下である。このＳ－Ｓカーブにおいては、１００％伸長時（伸長倍率が１００％）のときの伸縮フィルムのＳｔｒａｉｎ（歪み）を１００％とする。 In the elastic film of the present invention, the measurement points of the elongation ratios of 30%, 50%, and 70% on the hysteresis curve (stress-strain curve, SS curve) in which the stress at 0 to 100% elongation is measured are A, respectively. , B, and C, the slope of the straight line p connecting the points A and B and the slope of the straight line q connecting the points B and C are both 7.0 × 10 -3 or less. In this SS curve, the stripe (distortion) of the stretchable film at the time of 100% elongation (extension ratio is 100%) is set to 100%.
　直線ｐの傾きと直線ｑの傾きが共に７．０×１０－３以下であることで、伸縮フィルムを小さい力で、且つ一定の力で伸長することが可能になる。そのため、伸縮フィルムを伸長した状態で不織布やバックフィルム等の他部材と安定して貼り合わせることができ、工程安定性に優れる。
　本発明では、工程安定性がより優れる点から、直線ｐの傾きと直線ｑの傾きが共に５．０×１０－３以下であることが好ましい。
　また、工程安定性を向上させるのと同時に後述する永久ひずみを低下させる観点からは、直線ｐの傾きと直線ｑの傾きが共に３．９×１０－３～４．９×１０－３であることが好ましく、４．３×１０－３～４．８×１０－３であることがより好ましい。 When both the inclination of the straight line p and the inclination of the straight line q are 7.0 × 10 -3 or less, the stretchable film can be stretched with a small force and a constant force. Therefore, the stretchable film can be stably bonded to other members such as a non-woven fabric and a back film in a stretched state, and the process stability is excellent.
In the present invention, it is preferable that the slope of the straight line p and the slope of the straight line q are both 5.0 × 10 -3 or less from the viewpoint of more excellent process stability.
Further, from the viewpoint of improving the process stability and at the same time reducing the permanent strain described later, the slope of the straight line p and the slope of the straight line q are both 3.9 × 10 -3 to 4.9 × 10 -3 . It is preferably 4.3 × 10 -3 to 4.8 × 10 -3 , and more preferably 4.3 × 10 -3 to 4.8 × 10 -3.
　伸縮フィルムの３０％伸長時の応力は、３．０Ｎ／２５ｍｍ以下が好ましく、２．０Ｎ／２５ｍｍ以下がより好ましく、１．７Ｎ／２５ｍｍ以下がさらに好ましい。
　伸縮フィルムの１００％伸長時の応力は、３．０Ｎ／２５ｍｍ以下が好ましく、２．０Ｎ／２５ｍｍ以下がより好ましい。
　伸縮フィルムの３０％伸長時及び１００％伸長時の応力が前記上限値以下であれば、剛性が低い伸縮フィルムである。 The stress at 30% elongation of the stretchable film is preferably 3.0 N / 25 mm or less, more preferably 2.0 N / 25 mm or less, and further preferably 1.7 N / 25 mm or less.
The stress at 100% elongation of the stretchable film is preferably 3.0 N / 25 mm or less, more preferably 2.0 N / 25 mm or less.
If the stress at the time of 30% stretching and 100% stretching of the stretchable film is equal to or less than the upper limit value, the stretchable film has low rigidity.
　伸縮フィルムの永久ひずみは、３０％以下が好ましく、２０％以下がより好ましく、１５％以下がさらに好ましい。永久ひずみが前記上限値以下であれば、伸縮性に優れ、伸長した状態で不織布等の他部材と貼り合わせた後でも元の状態に戻りやすい。 The permanent strain of the stretchable film is preferably 30% or less, more preferably 20% or less, still more preferably 15% or less. When the permanent strain is not more than the upper limit value, the elasticity is excellent, and it is easy to return to the original state even after being bonded to another member such as a non-woven fabric in the stretched state.
　伸縮フィルムの総厚みは、２０～６０μｍが好ましく、２５～５５μｍがより好ましく、３０～５０μｍがさらに好ましい。伸縮フィルムの総厚みが前記範囲の下限値以上であれば、伸縮性に優れる。伸縮フィルムの総厚みが前記範囲の上限値以下であれば、伸縮フィルムを薄肉化でき、剛性が低くなり、伸縮性に優れる。 The total thickness of the stretchable film is preferably 20 to 60 μm, more preferably 25 to 55 μm, and even more preferably 30 to 50 μm. When the total thickness of the stretchable film is at least the lower limit of the above range, the stretchability is excellent. When the total thickness of the stretchable film is not more than the upper limit of the above range, the stretchable film can be thinned, the rigidity is lowered, and the stretchability is excellent.
　本発明の伸縮フィルムの態様としては、特に限定されず、エラストマー層と、エラストマー層の厚み方向の第１の面及び第２の面のいずれか一方又は両方に設けられた表面層と、を有する態様が好ましい。
　例えば、図１に例示した伸縮フィルム１、図２に例示した伸縮フィルム２が挙げられる。伸縮フィルム１は、図１に示すように、エラストマー層１０と、エラストマー層１０の第１の面１０ａに設けられた第１表面層２０とを備えている。伸縮フィルム２は、図２に示すように、エラストマー層１０と、エラストマー層１０の第１の面１０ａに設けられた第１表面層２０と、エラストマー層１０の第２の面１０ｂに設けられた第２表面層２２とを備えている。なお、図１及び図２の寸法等は一例であって、本発明はそれらに必ずしも限定されるものではなく、その要旨を変更しない範囲で適宜変更して実施することが可能である。
　なお、本発明の伸縮フィルムは、エラストマー層の第１の面及び第２の面の両方に表面層を有しないフィルムであってもよい。 The aspect of the elastic film of the present invention is not particularly limited, and includes an elastomer layer and a surface layer provided on either or both of the first surface and the second surface in the thickness direction of the elastomer layer. Aspects are preferred.
For example, the stretchable film 1 illustrated in FIG. 1 and the stretchable film 2 illustrated in FIG. 2 can be mentioned. As shown in FIG. 1, the elastic film 1 includes an elastomer layer 10 and a first surface layer 20 provided on the first surface 10a of the elastomer layer 10. As shown in FIG. 2, the elastic film 2 is provided on the elastomer layer 10, the first surface layer 20 provided on the first surface 10a of the elastomer layer 10, and the second surface 10b of the elastomer layer 10. A second surface layer 22 is provided. The dimensions and the like in FIGS. 1 and 2 are examples, and the present invention is not necessarily limited thereto, and the present invention can be appropriately modified without changing the gist thereof.
The elastic film of the present invention may be a film having no surface layer on both the first surface and the second surface of the elastomer layer.
　エラストマー層は、熱可塑性エラストマーを含む層である。
　エラストマー層は、本発明の効果を損なわない範囲であれば、熱可塑性エラストマー以外の他の成分を含んでもよい。他の成分としては、例えば、耐候安定剤、帯電防止剤、防曇剤、金属石鹸、ワックス、防かび剤、抗菌剤、造核剤、難燃剤、紫外線吸収剤、光安定剤、酸化防止剤、変色防止剤、顔料、染料、充填剤等の添加物や、ポリオレフィン系樹脂等の熱可塑性エラストマー以外の他の樹脂が挙げられる。 The elastomer layer is a layer containing a thermoplastic elastomer.
The elastomer layer may contain components other than the thermoplastic elastomer as long as the effects of the present invention are not impaired. Other ingredients include, for example, weather stabilizers, antistatic agents, antifogging agents, metal soaps, waxes, antifungal agents, antibacterial agents, nucleating agents, flame retardants, UV absorbers, light stabilizers, antioxidants. Examples thereof include additives such as discoloration inhibitors, pigments, dyes and fillers, and resins other than thermoplastic elastomers such as polyolefin resins.
　エラストマー層中の熱可塑性エラストマーの含有量は、エラストマー層の総質量に対して、８０質量％以上が好ましく、８５質量％以上がより好ましく、９０質量％以上がさらに好ましい。熱可塑性エラストマーの含有量が前記下限値以上であれば、伸縮性に優れる。 The content of the thermoplastic elastomer in the elastomer layer is preferably 80% by mass or more, more preferably 85% by mass or more, still more preferably 90% by mass or more, based on the total mass of the elastomer layer. When the content of the thermoplastic elastomer is at least the above lower limit value, the elasticity is excellent.
　エラストマー層の厚みは、２０～６０μｍが好ましく、２５～５５μｍがより好ましく、３０～５０μｍがさらに好ましい。エラストマー層の厚みが前記範囲の下限値以上であれば、伸縮性に優れる。エラストマー層の厚みが前記範囲の上限値以下であれば、剛性が低くなる。
　エラストマー層は、単層であってもよく、複層であってもよい。エラストマー層が複層である場合は、エラストマー層の合計の厚みを前記範囲とすることが好ましい。 The thickness of the elastomer layer is preferably 20 to 60 μm, more preferably 25 to 55 μm, and even more preferably 30 to 50 μm. When the thickness of the elastomer layer is at least the lower limit of the above range, the elasticity is excellent. When the thickness of the elastomer layer is equal to or less than the upper limit of the above range, the rigidity is low.
The elastomer layer may be a single layer or a plurality of layers. When the elastomer layer is a multi-layer, it is preferable that the total thickness of the elastomer layers is in the above range.
　耐ブロッキング性に優れる点から、表面層はポリオレフィン系樹脂と無機充填剤を含むことが好ましい。
　ポリオレフィン系樹脂は、非エラストマー性オレフィン樹脂である。ポリオレフィン系樹脂としては、例えば、ポリプロピレン、ポリエチレン等が挙げられる。ポリエチレンは、伸縮性に優れ、剛性も小さい点で好ましい。ポリプロピレンは、耐熱性に優れ、不織布等とホットメルト（１１０℃以上）で接着しても破れにくい点で好ましい。 The surface layer preferably contains a polyolefin resin and an inorganic filler from the viewpoint of excellent blocking resistance.
The polyolefin-based resin is a non-elastomeric olefin resin. Examples of the polyolefin resin include polypropylene, polyethylene and the like. Polyethylene is preferable because it has excellent elasticity and low rigidity. Polypropylene is preferable because it has excellent heat resistance and is not easily torn even when it is adhered to a non-woven fabric or the like by hot melt (110 ° C. or higher).
　ポリプロピレンとしては、例えば、ホモポリプロピレン（Ｈ－ＰＰ）、エチレンとの共重合体であるブロックポリプロピレン（Ｂ－ＰＰ）、エチレンとの共重合体であるランダムポリプロピレン（Ｒ－ＰＰ）等が挙げられる。なかでも、柔軟性に優れる点から、Ｂ－ＰＰ及びＲ－ＰＰからなる群から選ばれる１種以上が好ましい。
　ポリエチレンとしては、例えば、低密度ポリエチレン（ＬＤＰＥ）、高密度ポリエチレン（ＨＤＰＥ）等が挙げられる。
　表面層に含まれるポリオレフィン系樹脂は、１種でもよく、２種以上でもよい。 Examples of polypropylene include homopolypropylene (H-PP), block polypropylene (B-PP) which is a copolymer with ethylene, random polypropylene (R-PP) which is a copolymer with ethylene, and the like. Among them, one or more selected from the group consisting of B-PP and R-PP is preferable from the viewpoint of excellent flexibility.
Examples of polyethylene include low-density polyethylene (LDPE) and high-density polyethylene (HDPE).
The polyolefin-based resin contained in the surface layer may be one type or two or more types.
　エラストマー層の両面に第１表面層と第２表面層を設ける場合、第１表面層に含まれるポリオレフィン系樹脂と第２表面層に含まれるポリオレフィン系樹脂は、同じであってもよく、異なっていてもよい。 When the first surface layer and the second surface layer are provided on both sides of the elastomer layer, the polyolefin-based resin contained in the first surface layer and the polyolefin-based resin contained in the second surface layer may be the same or different. You may.
　表面層中のポリオレフィン系樹脂の含有量は、表面層の総質量に対して、４０～９０質量％が好ましく、５０～７０質量％がより好ましい。ポリオレフィン系樹脂の含有量が前記範囲の下限値以上であれば、不織布との接着性に優れる。ポリオレフィン系樹脂の含有量が前記範囲の上限値以下であれば、剛性が低くなり、伸縮性に優れる。
　尚、ポリオレフィン系樹脂の分子量については、本発明の要件を達成し得る限り特に制限はないが、メルトフローレート（ＭＦＲ）が、好ましくは１．０ｇ／１０分～２５．０ｇ／１０分であり、より好ましくは２．０ｇ／１０分～２３．０ｇ／１０分であり、さらに好ましくは２．０ｇ／１０分～２１．０ｇ／１０分であり、特に好ましくは２．０ｇ／１０分～２０．０ｇ／１０分である。ここで、測定条件は樹脂の種類に応じて適宜選択することができ、例えば、ポリプロピレンの場合は試験温度２３０℃、試験荷重２．１６ｋｇｆ、ポリエチレンの場合は試験温度１９０℃、試験荷重２．１６ｋｇｆとすることができる。 The content of the polyolefin resin in the surface layer is preferably 40 to 90% by mass, more preferably 50 to 70% by mass, based on the total mass of the surface layer. When the content of the polyolefin resin is at least the lower limit of the above range, the adhesiveness with the non-woven fabric is excellent. When the content of the polyolefin resin is not more than the upper limit of the above range, the rigidity is low and the elasticity is excellent.
The molecular weight of the polyolefin resin is not particularly limited as long as the requirements of the present invention can be achieved, but the melt flow rate (MFR) is preferably 1.0 g / 10 minutes to 25.0 g / 10 minutes. , More preferably 2.0 g / 10 minutes to 23.0 g / 10 minutes, further preferably 2.0 g / 10 minutes to 21.0 g / 10 minutes, and particularly preferably 2.0 g / 10 minutes to 20 minutes. It is 0.0 g / 10 minutes. Here, the measurement conditions can be appropriately selected according to the type of resin. For example, in the case of polypropylene, the test temperature is 230 ° C. and the test load is 2.16 kgf, and in the case of polyethylene, the test temperature is 190 ° C. and the test load is 2.16 kgf. Can be.
　無機充填剤としては、例えば、炭酸カルシウム、ゼオライト、シリカ、タルク、アルミナ等が挙げられる。表面層に含まれる無機充填剤は、１種でもよく、２種以上でもよい。 Examples of the inorganic filler include calcium carbonate, zeolite, silica, talc, alumina and the like. The inorganic filler contained in the surface layer may be one kind or two or more kinds.
　表面層中の無機充填剤の含有量は、前記表面層の総質量に対して、１０～６０質量％が好ましく、３０～５０質量％がより好ましい。無機充填剤の含有量が前記範囲の下限値以上であれば、耐ブロッキング性に優れ、剛性が低くなり、伸縮性に優れる。無機充填剤の含有量が前記範囲の上限値以下であれば、伸縮フィルムの製造が安定になる。
　また、無機充填剤の平均粒子径は、１μｍ～１５μｍが好ましく、２μｍ～８μｍがより好ましい。
  無機充填剤の平均粒子径が上記範囲内であれば、無機充填剤の二次凝集等を抑制して樹脂への分散性が良好となり、肌触りがよくなる。無機充填剤の平均粒子径は、レーザー回折法で測定することができる。
  無機充填剤が球状又はこれに準ずる形状の場合、その直径（外径）を粒子径とし、無機充填剤が不定形粉体の場合、その形状の最も長い箇所（長径）を粒子径とする。また、上記の平均粒子径は、メディアン径（５０％径）である。
　尚、エラストマー層にも上記の無機充填剤が含まれていても良いが、その場合の無機充填剤の含有量は、前記エラストマー層の総質量に対して、１～１０質量％が好ましく、２～５質量％がより好ましい。 The content of the inorganic filler in the surface layer is preferably 10 to 60% by mass, more preferably 30 to 50% by mass, based on the total mass of the surface layer. When the content of the inorganic filler is at least the lower limit of the above range, the blocking resistance is excellent, the rigidity is low, and the elasticity is excellent. When the content of the inorganic filler is not more than the upper limit of the above range, the production of the stretchable film becomes stable.
The average particle size of the inorganic filler is preferably 1 μm to 15 μm, more preferably 2 μm to 8 μm.
When the average particle size of the inorganic filler is within the above range, the secondary aggregation of the inorganic filler is suppressed, the dispersibility in the resin is improved, and the feel is improved. The average particle size of the inorganic filler can be measured by laser diffraction.
When the inorganic filler has a spherical shape or a shape similar thereto, its diameter (outer diameter) is defined as the particle diameter, and when the inorganic filler is an amorphous powder, the longest portion (major diameter) of the shape is defined as the particle diameter. The average particle size is the median diameter (50% diameter).
The elastomer layer may also contain the above-mentioned inorganic filler, but the content of the inorganic filler in that case is preferably 1 to 10% by mass with respect to the total mass of the elastomer layer. More preferably ~ 5% by mass.
　表面層は、本発明の効果を損なわない範囲であれば、ポリオレフィン系樹脂及び無機充填剤以外の他の成分を含んでもよい。他の成分としては、例えば、エラストマー層で挙げた添加物が挙げられる。 The surface layer may contain components other than the polyolefin resin and the inorganic filler as long as the effects of the present invention are not impaired. Other components include, for example, the additives mentioned in the elastomer layer.
　表面層の厚みは、０．５～４．０μｍが好ましく、１．０～３．０μｍがより好ましい。表面層の厚みが前記範囲の下限値以上であれば、伸縮フィルムの製造がより安定になる。表面層の厚みが前記範囲の上限値以下であれば、表面層の剛性が伸縮フィルムに与える影響が小さくなるため、伸縮フィルムの剛性が低くなり、伸縮性に優れる。
　エラストマー層の両面に第１表面層と第２表面層を設ける場合、それら第１表面層の厚みと第２表面層の厚みをそれぞれ前記範囲とすることが好ましい。　 The thickness of the surface layer is preferably 0.5 to 4.0 μm, more preferably 1.0 to 3.0 μm. When the thickness of the surface layer is at least the lower limit of the above range, the production of the stretchable film becomes more stable. When the thickness of the surface layer is not more than the upper limit of the above range, the influence of the rigidity of the surface layer on the stretchable film is small, so that the rigidity of the stretchable film is low and the stretchability is excellent.
When the first surface layer and the second surface layer are provided on both sides of the elastomer layer, it is preferable that the thickness of the first surface layer and the thickness of the second surface layer are within the above ranges, respectively.
　伸縮フィルムの製造方法は、特に限定されず、例えば、インフレーション法、キャストフィルムプロセス法等が挙げられる。なかでも、生産性の点から、キャストフィルムプロセス法が好ましい。 The method for producing the stretchable film is not particularly limited, and examples thereof include an inflation method and a cast film process method. Of these, the cast film process method is preferable from the viewpoint of productivity.
　本発明の伸縮フィルムは、機械物性、特に収縮応力、永久ひずみを調整する目的で、延伸処理を施してもよい。応力（剛性）が低下し、直線ｐの傾き及び直線ｑの傾きが７．０×１０－３以下の伸縮フィルムが得られやすい点から、延伸処理が施されていることが好ましく、幅方向（ＴＤ）に延伸処理が施されていることがより好ましい。 The stretchable film of the present invention may be stretched for the purpose of adjusting mechanical properties, particularly shrinkage stress and permanent strain. Since the stress (rigidity) is reduced and a stretchable film having a straight line p slope and a straight line q slope of 7.0 × 10 -3 or less can be easily obtained, it is preferable that the stretching treatment is performed, and the stretching treatment is performed. It is more preferable that the TD) is stretched.
　延伸方法は、特に限定されず、例えば、ロール延伸、テンター延伸、ギア延伸等が挙げられる。なかでも、生産性の点から、ギア延伸が好ましい。
　延伸倍率は、特に限定されず、例えば、３００～４００％とすることができる。延伸倍率がこの範囲にあることにより、直線ｐの傾き及び直線ｑの傾きを７．０×１０－３以下に調整することが容易になる。 The stretching method is not particularly limited, and examples thereof include roll stretching, tenter stretching, and gear stretching. Of these, gear extension is preferable from the viewpoint of productivity.
The draw ratio is not particularly limited and can be, for example, 300 to 400%. When the draw ratio is in this range, it becomes easy to adjust the slope of the straight line p and the slope of the straight line q to 7.0 × 10 -3 or less.
　本発明の伸縮フィルムの用途は、特に限定されず、衛生用品、スポーツ用品、医療用品等に使用できる。例えば、下着等の衣服、紙おむつのウエストバンド、サイドパネル、レッグギャザー、失禁用品、生理用ナプキン、包帯、外科的ドレープ、締め付け用バンド、帽子、水泳パンツ、スポーツ用サポーター、医療品サポーター等に使用できる。 The use of the elastic film of the present invention is not particularly limited, and can be used for sanitary goods, sports goods, medical goods, and the like. For example, used for clothing such as underwear, waistbands for disposable diapers, side panels, leg gathers, incontinence materials, sanitary napkins, bandages, surgical drapes, tightening bands, hats, swimming pants, sports supporters, medical supporters, etc. can.
　以上説明したように、本発明の伸縮フィルムは、直線ｐの傾きと直線ｑの傾きが共に７．０×１０－３以下である。そのため、伸縮フィルムを小さい力で、且つ一定の力で伸長することが可能になり、伸縮フィルムを伸長した状態で不織布やバックフィルム等の他部材と安定して貼り合わせることができ、工程安定性に優れる。 As described above, in the stretchable film of the present invention, both the inclination of the straight line p and the inclination of the straight line q are 7.0 × 10 -3 or less. Therefore, the stretchable film can be stretched with a small force and with a constant force, and the stretchable film can be stably bonded to other members such as a non-woven fabric and a back film in a stretched state, resulting in process stability. Excellent for.
　以下、実施例によって本発明を具体的に説明するが、本発明は以下の記載によっては限定されない。 Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to the following description.
［測定方法、評価方法］
　（各層の厚み）
　伸縮フィルムにおけるエラストマー層及び表面層の厚みは、マイクロスコープによる断面観察によって求めた。 [Measurement method, evaluation method]
(Thickness of each layer)
The thicknesses of the elastomer layer and the surface layer of the elastic film were determined by observing the cross section with a microscope.
　（伸縮フィルムの永久ひずみ）
　伸縮フィルムから、フィルムのＴＤに１００ｍｍ、ＴＤに対して垂直方向（ＭＤ）に２５ｍｍの短冊状試験片を切り取った。試験片を精密万能試験機（島津製作所社製、オートグラフ、材料試験オペレーションソフトウエア：ＴＲＡＰＥＺＩＵＭ２）のつかみ具につかみ具間距離が２５ｍｍとなるように固定した。試験片を長手方向に速度２５４ｍｍ／分にて下記式（Ｉ）で算出される伸び（伸長倍率）が１００％となるように伸長した後、直ちに試験片を同速度（２５４ｍｍ／分）にて収縮させた。下記式（ＩＩ）から永久ひずみを算出した。試験は、２３℃±２℃で行った。
　伸び＝（Ｌ１－Ｌ０）／Ｌ０×１００　　（Ｉ）
　永久ひずみ＝（Ｌ２－Ｌ０）／Ｌ０×１００　　（ＩＩ）
　ただし、Ｌ０は、伸長する前のつかみ具間距離（ｍｍ）である。Ｌ１は、伸長した後のつかみ具間距離（ｍｍ）である。Ｌ２は、収縮させる際に試験片の荷重（Ｎ／２５ｍｍ）が０になるときのつかみ具間距離（ｍｍ）である。 (Permanent strain of elastic film)
A strip-shaped test piece of 100 mm in TD of the film and 25 mm in the direction perpendicular to TD (MD) was cut from the stretchable film. The test piece was fixed to the grip of a precision universal testing machine (manufactured by Shimadzu Corporation, autograph, material test operation software: TRAPEZIUM2) so that the distance between the grips was 25 mm. After stretching the test piece in the longitudinal direction at a speed of 254 mm / min so that the elongation (elongation ratio) calculated by the following formula (I) becomes 100%, immediately stretch the test piece at the same speed (254 mm / min). Shrinked. The permanent strain was calculated from the following formula (II). The test was conducted at 23 ° C. ± 2 ° C.
Elongation = (L1-L0) / L0 × 100 (I)
Permanent strain = (L2-L0) / L0 × 100 (II)
However, L0 is the distance between the gripping tools (mm) before extension. L1 is the distance between the gripping tools (mm) after the extension. L2 is the distance between the gripping tools (mm) when the load (N / 25 mm) of the test piece becomes 0 when the test piece is contracted.
　（ヒステリシスカーブ）
　伸縮フィルムの永久ひずみを算出する時と同様の方法で、伸長倍率１００％となるように伸長した後、直ちに試験片を同速度（２５４ｍｍ／分）にて収縮させた際の伸長倍率（％）を横軸、応力（Ｎ／２５ｍｍ）を縦軸にプロットした曲線をヒステリシスカーブという。 (Hysteresis curve)
Stretching ratio (%) when the test piece is immediately contracted at the same speed (254 mm / min) after stretching to a elongation ratio of 100% by the same method as when calculating the permanent strain of the stretchable film. Is called a hysteresis curve, and a curve obtained by plotting stress (N / 25 mm) on the horizontal axis and stress (N / 25 mm) on the vertical axis is called a hysteresis curve.
　（工程安定性）
　工程安定性は、ヒステリシスカーブの伸長倍率が３０％、５０％、７０％の測定点をそれぞれＡ、Ｂ、Ｃとしたとき、点Ａと点Ｂを結ぶ直線ｐの傾きと、点Ｂと点Ｃを結ぶ直線ｑの傾きについて、以下の評価基準に従って評価した。
　◎（優良）：直線ｐの傾きと直線ｑの傾きが共に５．０×１０－３以下である。
　○（良）：直線ｐの傾きと直線ｑの傾きの少なくとも一方が５．０×１０－３を超えるが、直線ｐの傾きと直線ｑの傾きが共に７．０×１０－３以下である。
　×（不良）：直線ｐの傾きと直線ｑの傾きの少なくとも一方が７．０×１０－３超える。 (Process stability)
The process stability is the slope of the straight line p connecting the points A and B and the points B and the points when the measurement points of the hysteresis curve with the elongation ratios of 30%, 50%, and 70% are A, B, and C, respectively. The slope of the straight line q connecting C was evaluated according to the following evaluation criteria.
⊚ (excellent): The slope of the straight line p and the slope of the straight line q are both 5.0 × 10 -3 or less.
◯ (Good): At least one of the slope of the straight line p and the slope of the straight line q exceeds 5.0 × 10 -3 , but the slope of the straight line p and the slope of the straight line q are both 7.0 × 10 -3 or less. ..
X (defective): At least one of the slope of the straight line p and the slope of the straight line q exceeds 7.0 × 10 -3.
　（貼り合わせ安定性）
　伸縮フィルムをフィルムのＴＤに１００ｍｍ、ＴＤに対して垂直方向（ＭＤ）に２５ｍｍの短冊状試験片に切り取り、試験片を長手方向に速度２５４ｍｍ／分、伸長倍率５０％で伸長した状態での不織布との貼り合わせ安定性について、以下の評価基準に従って評価した。
　○（良）：貼り合わせ作業を安定して行えた。
　×（不良）：貼り合わせ作業を安定して行えなかった。 (Lasting stability)
The stretchable film is cut into strip-shaped test pieces of 100 mm in the TD of the film and 25 mm in the direction perpendicular to the TD (MD), and the test pieces are stretched in the longitudinal direction at a speed of 254 mm / min and an elongation ratio of 50%. The bonding stability with and was evaluated according to the following evaluation criteria.
○ (Good): The bonding work was performed stably.
× (defective): The bonding work could not be performed stably.
［原料］
　本実施例で使用した原料を以下に示す。
（熱可塑性エラストマー）
　エラストマー（Ａ－１）：ＳＩＳエラストマー（Ｑｕｉｎｔａｃ３３９０、スチレン単位含有率４８質量％、日本ゼオン社製）
　エラストマー（Ａ－２）：ＳＩＳエラストマー（Ｑｕｉｎｔａｃ３６２０、スチレン単位含有率１４質量％、日本ゼオン社製）
　エラストマー（Ａ－３）：ＰＰ系エラストマー（Ｖｉｓｔａｍａｘｘ６１０２ＦＬ、エクソン社製）
　エラストマー（Ａ－４）：ＰＰ系エラストマー（Ｖｉｓｔａｍａｘｘ６２０２、エクソン社製） [material]
The raw materials used in this example are shown below.
(Thermoplastic elastomer)
Elastomer (A-1): SIS elastomer (Quintac3390, styrene unit content 48% by mass, manufactured by Zeon Corporation)
Elastomer (A-2): SIS elastomer (Quintac3620, styrene unit content 14% by mass, manufactured by Zeon Corporation)
Elastomer (A-3): PP-based elastomer (Vistamaxx6102FL, manufactured by Exxon)
Elastomer (A-4): PP-based elastomer (Vistamaxx6202, manufactured by Exxon)
　（ポリオレフィン系樹脂）
　樹脂（Ｂ－１）：Ｒ－ＰＰ（Ｆ２２７、融点１５２℃、プライムポリマー社製）
　樹脂（Ｂ－２）：ＬＤＰＥ（ＣＥ３５０６、融点１１７℃、スミカセン社製）
　樹脂（Ｂ－３）：ＨＤＰＥ（ニポロンハード１０００、東ソー社製） (Polyolefin resin)
Resin (B-1): R-PP (F227, melting point 152 ° C., manufactured by Prime Polymer Co., Ltd.)
Resin (B-2): LDPE (CE3506, melting point 117 ° C, manufactured by Sumikasen)
Resin (B-3): HDPE (Nipolon Hard 1000, manufactured by Tosoh Corporation)
　（無機充填剤）
　充填剤（Ｃ－１）：炭酸カルシウム（ライトンＳ、備北粉化工業社製） (Inorganic filler)
Filler (C-1): Calcium carbonate (Ryton S, manufactured by Bihoku Powder Industry Co., Ltd.)
［実施例１］
　表面層を形成する各成分を表１に示す配合でタンブラーミキサーにより混合して樹脂混合物を得た。次いで、キャストフィルムプロセス法により、第１エラストマー層の両側に第２エラストマー層と第３エラストマー層が設けられた３層構成のエラストマー層と、前記エラストマー層の第２エラストマー層側に設けられた第１表面層と、第３エラストマー層側に設けられた第２表面層とを有する伸縮フィルムを製造した。成形後、伸縮フィルムは幅方向（ＴＤ）にギア延伸によって４００％延伸した。 [Example 1]
Each component forming the surface layer was mixed with a tumbler mixer in the formulation shown in Table 1 to obtain a resin mixture. Next, by a cast film process method, an elastomer layer having a three-layer structure in which a second elastomer layer and a third elastomer layer were provided on both sides of the first elastomer layer, and a second elastomer layer provided on the second elastomer layer side of the elastomer layer. An elastic film having one surface layer and a second surface layer provided on the third elastomer layer side was produced. After molding, the stretchable film was stretched 400% in the width direction (TD) by gear stretching.
［実施例２、３、５～８、比較例３～７］
　エラストマー層を１層とし、各層の組成及び厚み、延伸処理の有無及び条件を表１及び表２に示すとおりに変更した以外は、実施例１と同様にして伸縮フィルムを製造した。 [Examples 2, 3, 5 to 8, Comparative Examples 3 to 7]
An elastic film was produced in the same manner as in Example 1 except that the elastomer layer was used as one layer and the composition and thickness of each layer, the presence or absence of stretching treatment, and the conditions were changed as shown in Tables 1 and 2.
［実施例４、比較例１、２］
　各層の組成及び厚み、延伸処理の有無及び条件を表１及び表２に示すとおりに変更した以外は、実施例１と同様にして伸縮フィルムを製造した。 [Example 4, Comparative Examples 1 and 2]
An elastic film was produced in the same manner as in Example 1 except that the composition and thickness of each layer, the presence or absence of stretching treatment, and the conditions were changed as shown in Tables 1 and 2.
　各例の評価結果を表１及び表２に示す。 The evaluation results of each example are shown in Tables 1 and 2.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　表１及び表２に示すように、実施例１～８の伸縮フィルムは、比較例１～７の伸縮フィルムに比べて工程安定性、貼り合わせ安定性に優れていた。 As shown in Tables 1 and 2, the stretchable films of Examples 1 to 8 were superior to the stretchable films of Comparative Examples 1 to 7 in process stability and bonding stability.
１，２　伸縮フィルム
１０　エラストマー層
１０ａ　第１の面
１０ｂ　第２の面
２０　第１表面層
２２　第２表面層 1, 2 Elastic film 10 Elastomer layer 10a First surface 10b Second surface 20 First surface layer 22 Second surface layer

Claims (7)

  1. 　無機充填剤と熱可塑性エラストマーとを含み、
    　０～１００％伸長時の応力を測定したヒステリシスカーブにおける、伸長倍率が３０％、５０％、７０％の測定点をそれぞれＡ、Ｂ、Ｃとしたとき、点Ａと点Ｂを結ぶ直線ｐの傾きと、点Ｂと点Ｃを結ぶ直線ｑの傾きが共に７．０×１０－３以下である、伸縮フィルム。     Contains inorganic fillers and thermoplastic elastomers
    When the measurement points with elongation ratios of 30%, 50%, and 70% in the hysteresis curve for measuring the stress at 0 to 100% elongation are A, B, and C, respectively, the straight line p connecting the points A and B An elastic film in which the inclination and the inclination of the straight line q connecting the points B and C are both 7.0 × 10 -3 or less.
  2. 　エラストマー層と、前記エラストマー層の第１の面及び第２の面のいずれか一方又は両方に設けられた表面層と、を有する、請求項１に記載の伸縮フィルム。 The elastic film according to claim 1, further comprising an elastomer layer and a surface layer provided on either or both of the first surface and the second surface of the elastomer layer.
  3. 　前記エラストマー層が熱可塑性エラストマーを含み、前記表面層がポリオレフィン系樹脂と無機充填剤を含む、請求項２に記載の伸縮フィルム。 The elastic film according to claim 2, wherein the elastomer layer contains a thermoplastic elastomer, and the surface layer contains a polyolefin resin and an inorganic filler.
  4. 　前記エラストマー層中の前記熱可塑性エラストマーの含有量が、前記エラストマー層の総質量に対して８０質量％以上であり、
    　前記表面層中の前記ポリオレフィン系樹脂の含有量が、前記表面層の総質量に対して４０～９０質量％であり、
    　前記表面層中の前記無機充填剤の含有量が、前記表面層の総質量に対して１０～６０質量％である、請求項３に記載の伸縮フィルム。     The content of the thermoplastic elastomer in the elastomer layer is 80% by mass or more with respect to the total mass of the elastomer layer.
    The content of the polyolefin resin in the surface layer is 40 to 90% by mass with respect to the total mass of the surface layer.
    The elastic film according to claim 3, wherein the content of the inorganic filler in the surface layer is 10 to 60% by mass with respect to the total mass of the surface layer.
  5. 　総厚みが２０～６０μｍである、請求項１～４のいずれか一項に記載の伸縮フィルム。 The stretchable film according to any one of claims 1 to 4, which has a total thickness of 20 to 60 μm.
  6. 　前記表面層の厚みが０．５～４．０μｍである、請求項２～５のいずれか一項に記載の伸縮フィルム。 The stretchable film according to any one of claims 2 to 5, wherein the surface layer has a thickness of 0.5 to 4.0 μm.
  7. 　幅方向に延伸処理が施されている、請求項１～６のいずれか一項に記載の伸縮フィルム。 The stretchable film according to any one of claims 1 to 6, which is stretched in the width direction.
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