WO2012165438A1 - 多層弾性フィルム - Google Patents
多層弾性フィルム Download PDFInfo
- Publication number
- WO2012165438A1 WO2012165438A1 PCT/JP2012/063789 JP2012063789W WO2012165438A1 WO 2012165438 A1 WO2012165438 A1 WO 2012165438A1 JP 2012063789 W JP2012063789 W JP 2012063789W WO 2012165438 A1 WO2012165438 A1 WO 2012165438A1
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- WO
- WIPO (PCT)
- Prior art keywords
- layer
- elastic film
- polypropylene
- multilayer elastic
- resin composition
- Prior art date
Links
- 229920001155 polypropylene Polymers 0.000 claims abstract description 66
- -1 polypropylene Polymers 0.000 claims abstract description 63
- 239000004743 Polypropylene Substances 0.000 claims abstract description 62
- 239000011342 resin composition Substances 0.000 claims abstract description 50
- 229920005989 resin Polymers 0.000 claims abstract description 38
- 239000011347 resin Substances 0.000 claims abstract description 38
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 17
- 229920000098 polyolefin Polymers 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 229920001577 copolymer Polymers 0.000 claims description 8
- 150000001336 alkenes Chemical class 0.000 claims description 5
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 3
- 239000005977 Ethylene Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000004745 nonwoven fabric Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 238000004581 coalescence Methods 0.000 claims 1
- 229920005606 polypropylene copolymer Polymers 0.000 claims 1
- 239000010410 layer Substances 0.000 description 137
- 239000010408 film Substances 0.000 description 86
- 238000011084 recovery Methods 0.000 description 31
- 238000000034 method Methods 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 14
- 238000005259 measurement Methods 0.000 description 13
- 238000000465 moulding Methods 0.000 description 12
- 238000009826 distribution Methods 0.000 description 8
- 238000001914 filtration Methods 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- PBKONEOXTCPAFI-UHFFFAOYSA-N 1,2,4-trichlorobenzene Chemical compound ClC1=CC=C(Cl)C(Cl)=C1 PBKONEOXTCPAFI-UHFFFAOYSA-N 0.000 description 6
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 6
- 238000005227 gel permeation chromatography Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 5
- 238000001460 carbon-13 nuclear magnetic resonance spectrum Methods 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000002981 blocking agent Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 230000009477 glass transition Effects 0.000 description 3
- 229920006280 packaging film Polymers 0.000 description 3
- 239000012785 packaging film Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000009751 slip forming Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 235000010724 Wisteria floribunda Nutrition 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- MCULRUJILOGHCJ-UHFFFAOYSA-N triisobutylaluminium Chemical compound CC(C)C[Al](CC(C)C)CC(C)C MCULRUJILOGHCJ-UHFFFAOYSA-N 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- SKBXVAOMEVOTGJ-UHFFFAOYSA-N xi-Pinol Chemical compound CC1=CCC2C(C)(C)OC1C2 SKBXVAOMEVOTGJ-UHFFFAOYSA-N 0.000 description 2
- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 1
- 102100037815 Fas apoptotic inhibitory molecule 3 Human genes 0.000 description 1
- 101000878510 Homo sapiens Fas apoptotic inhibitory molecule 3 Proteins 0.000 description 1
- JLTDJTHDQAWBAV-UHFFFAOYSA-N N,N-dimethylaniline Chemical compound CN(C)C1=CC=CC=C1 JLTDJTHDQAWBAV-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000005003 food packaging material Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000002815 homogeneous catalyst Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012968 metallocene catalyst Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
-
- 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
- B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/51—Elastic
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/516—Oriented mono-axially
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/518—Oriented bi-axially
-
- 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
- B32B2437/00—Clothing
-
- 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
- B32B2555/00—Personal care
-
- 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
- B32B2555/00—Personal care
- B32B2555/02—Diapers or napkins
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
- Y10T428/31913—Monoolefin polymer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/674—Nonwoven fabric with a preformed polymeric film or sheet
- Y10T442/678—Olefin polymer or copolymer sheet or film [e.g., polypropylene, polyethylene, ethylene-butylene copolymer, etc.]
Definitions
- the present invention relates to a multilayer elastic film, and more particularly to a multilayer elastic film used for elastic members of sanitary goods such as disposable diapers and sanitary napkins.
- Patent Document 1 at least one layer composed of a propylene polymer [I] having a mesopentad fraction [mmmm] of 20 to 60 mol% and satisfying [rrrr] / (1- [mmmm]) ⁇ 0.1.
- a miscellaneous goods packaging film and a miscellaneous goods packaging film having at least one layer made of a resin composition containing the propylene polymer [I] and the olefin polymer [II] are disclosed.
- Patent Document 2 discloses that a specific tensile elastic modulus and intrinsic viscosity are obtained, the mesopentad fraction [mmmm] is 20 to 60 mol%, and [rrrr] / (1- [mmmm]) ⁇ 0.1.
- a polypropylene film made of a propylene polymer satisfying the above requirements is disclosed.
- Patent Document 1 discloses a miscellaneous packaging film having a tensile modulus of elasticity of 20 MPa or more, but has low stretchability and elastic recovery.
- the propylene polymer constituting the polypropylene film disclosed in Patent Document 2 has a low crystallization rate and a glass transition temperature lower than room temperature, when molding into a film, a resin sticks to a molding machine, There is a problem that when the film is wound in a roll shape, it becomes impossible to separate the film due to blocking between the films, and continuous molding is difficult.
- the problem to be solved by the present invention is to provide a multilayer elastic film having excellent elastic recovery and capable of continuous molding.
- the present invention has (A) layer made of polypropylene (A) satisfying the following (a) to (d) and (B) layer made of polyolefin resin or resin composition, and has the following formula A multilayer elastic film satisfying (1) is provided.
- A) [mmmm] 20-60 mol%
- Y (B) Crystallinity (%) of resin or resin composition constituting the layer
- X (B) total thickness of layer / total thickness of multilayer elastic film ⁇ 100 (%)
- the multilayer elastic film of the present invention has an excellent elastic recovery property, and even when continuously formed, the film does not stick to a molding machine or block between films when wound into a roll.
- the multilayer elastic film of the present invention has a (A) layer made of polypropylene (A) satisfying the following (a) to (d), and a (B) layer made of a polyolefin resin or a resin composition, and The following formula (1) is satisfied.
- A) [mmmm] 20-60 mol%
- D [mm] ⁇ [rr] / [mr] 2 ⁇ 2.0 Y ⁇ 600 / X
- Y (B) Crystallinity (%) of resin or resin composition constituting the layer
- X (B) total thickness of layer / total thickness of multilayer elastic film ⁇ 100 (%)
- the layer (A) in the multilayer elastic film of the present invention is made of polypropylene (A) satisfying the following (a) to (d).
- (A) [mmmm] 20-60 mol%
- the polypropylene (A) preferably satisfies the following (e) and (f).
- the weight average molecular weight (Mw) is 100,000 to 500,000 and the molecular weight distribution (Mw / Mn) ⁇ 4
- the mesopentad fraction [mmmm] is an index representing the stereoregularity of polypropylene, and the stereoregularity increases as the mesopentad fraction [mmmm] increases.
- the mesopentad fraction [mmmm] of the polypropylene (A) used in the present invention is 20 to 60 mol%, preferably 30 to 50 mol%, more preferably 40 to 50 mol%.
- the mesopentad fraction [mmmm] is 20 mol% or more, the occurrence of stickiness is suppressed.
- the mesopentad fraction [mmmm] is 60 mol% or less, the degree of crystallinity does not become too high, so that the elastic recovery is good.
- the mesopentad fraction [mmmm], the racemic pentad fraction [rrrr], and the racemic meso racemic meso pendad fraction [rmrm] of polypropylene were determined by A. Zambelli et al., “Macromolecules, 6, 925 (1973).
- the meso fraction, the racemic fraction, and the racemic meso-racemic meso fraction in pentad units in the polypropylene molecular chain measured by the methyl group signal in the 13 C-NMR spectrum in accordance with the method proposed in .
- the mesotriad fraction [mm], the racemic triad fraction [rr] and the triad fraction [mr], which will be described later, are also calculated by the above method.
- the 13 C-NMR spectrum was measured by the method described in the examples.
- Racemic meso racemic meso fraction [rmrm] is an index representing the randomness of the stereoregularity of polypropylene, and the randomness of polypropylene increases as the value increases.
- the racemic meso racemic meso fraction [rmrm] of the polypropylene (A) used in the present invention is more than 2.5 mol%, preferably 2.6 mol% or more, more preferably 2.7 mol% or more. The upper limit is usually about 10 mol%. When the racemic meso racemic meso fraction [rmrm] is 2.5 mol% or more, the randomness of the stereoregularity of polypropylene is increased, and the elastic recovery is further improved.
- the weight average molecular weight (Mw) is preferably 100,000 to 500,000, more preferably 150,000 to 250,000, from the viewpoint of molding processability and suppression of stickiness. More preferably, it is 180,000 to 220,000.
- the molecular weight distribution (Mw / Mn) is preferably less than 4, more preferably 3 or less, from the viewpoint of suppressing the occurrence of stickiness.
- the weight average molecular weight (Mw) is a polystyrene equivalent weight average molecular weight measured by the gel permeation chromatography (GPC) method using the following apparatus and conditions.
- the molecular weight distribution (Mw / Mn) is a value calculated from the number average molecular weight (Mn) and the weight average molecular weight (Mw) measured in the same manner.
- the GPC measurement in this specification was performed by the method as described in an Example.
- MFR Melt flow rate
- the MFR in this specification is a value measured in accordance with JIS K7210 under conditions of a temperature of 230 ° C. and a load of 21.18N.
- the MFR of the polypropylene (A) used in the present invention is preferably 100 g / 10 min or less, more preferably 1.0 to 60 g / 10 min, from the viewpoint of moldability and lamination unevenness with other layers.
- the above (a) to (f) can be adjusted by appropriately determining the catalyst and reaction conditions for producing the polypropylene (A).
- the polypropylene (A) used in the present invention is synthesized using a homogeneous catalyst called a so-called metallocene catalyst as described in, for example, International Publication No. 2003/087172, Japanese Patent Application Laid-Open No. 2010-168713, and the like. can do.
- commercially available polypropylene can be used as the polypropylene (A) in the present invention, and for example, El Modu X901S (trade name, manufactured by Idemitsu Kosan Co., Ltd.) can be used.
- ⁇ (B) layer> (B) layer in the multilayer elastic film of this invention consists of polyolefin resin or a resin composition.
- Polyolefin resin or resin composition Polyolefin resins include polyethylene, polypropylene (excluding polypropylene (A)), a copolymer of ethylene and an olefin having 3 to 8 carbon atoms, propylene and an olefin having 4 to 8 carbon atoms, from the viewpoint of moldability.
- a polyolefin (B) which is a copolymer of these or a blend thereof is preferred.
- Specific examples of the copolymer of ethylene and an olefin having 3 to 8 carbon atoms include, for example, an ethylene-octene copolymer.
- the polyolefin (B) a commercially available product can be used.
- an ethylene-octene copolymer manufactured by DuPont Dow Elastomer, trade name: Engage 8407 can be used.
- the polyolefin resin composition may contain polypropylene (A).
- polypropylene (A) As the polyolefin resin composition, from the viewpoint of moldability, when the total of polypropylene (A) and polyolefin (B) is 100% by mass, polypropylene (A) 0 to 95% by mass and polyolefin (B) 5 A resin composition containing a resin component consisting of ⁇ 100 mass% is preferred.
- the content ratio of polypropylene (A) and polyolefin (B) in the resin component of the resin composition is determined in terms of moldability, continuous moldability and elastic recovery rate, and the crystallinity of the resin composition and the thickness of the (B) layer. It can be determined appropriately from the viewpoint of the relationship.
- the content of polyolefin (B) in the resin component of the resin composition is 10% by mass or more. Is more preferable, it is more preferable that it is 20 mass% or more, and it is still more preferable that it is 50 mass% or more.
- the polyolefin resin composition may contain various additives as necessary.
- the additive include an antioxidant, a neutralizing agent, a slip agent, an antiblocking agent, an antifogging agent, and an antistatic agent. These additives may be used individually by 1 type, and may be used in combination of 2 or more types. Among these, it is preferable to contain an antiblocking agent from a viewpoint of the handleability at the time of shaping
- the anti-blocking agent is not particularly limited, and various anti-blocking agents such as silica-based, zeolite-based and polymer beads can be used.
- synthetic silica-based anti-blocking agent manufactured by Fuji Silysia Co., Ltd., trade name: Silo Hovic
- the content of the antiblocking agent in the resin composition is preferably 1000 to 10000 mass ppm, more preferably 1000 to 5000 mass ppm, based on the resin composition.
- the MFR is preferably 100 g / 10 min or less, more preferably from the viewpoint of molding processability and uneven lamination with other layers. It is 1.0 to 60 g / 10 min, more preferably 2.0 to 40 g / 10 min, still more preferably 3.0 to 30 g / 10 min. MFR is a value measured in accordance with JIS K7210 under conditions of a temperature of 230 ° C. and a load of 21.18N.
- the degree of crystallinity is an index indicating the hardness of the resin or resin composition.
- the measurement of the crystallinity degree in this specification was performed by the method as described in an Example.
- the degree of crystallinity of the polyolefin-based resin or resin composition constituting the layer (B) of the multilayer elastic film of the present invention is the same as the thickness of the layer (B) from the viewpoint of molding processability, continuous moldability, and elastic recovery rate. The relationship is determined so as to satisfy the following formula (1).
- Y (B) Crystallinity (%) of resin or resin composition constituting the layer
- X (B) total thickness of layer / total thickness of multilayer elastic film ⁇ 100 (%)
- the formula (1) is (B) from the viewpoint of the elastic recovery rate of the film because the (B) layer is hard and has low stretchability. It is required to reduce the thickness of the layer, and when a resin or resin composition having a low crystallinity is used as the (B) layer, the (B) layer is soft, so the (B) layer is thickened. It means you may do it.
- the crystallinity of the resin or resin composition constituting the layer can be set as appropriate.
- a resin having a high crystallinity and a resin having a low crystallinity such as polypropylene (A) are mixed. You may adjust.
- the average value of the crystallinity of the entire (B) layer may satisfy the above formula (1).
- the crystallinity of the polyolefin-based resin or resin composition constituting the (B) layer of the multilayer elastic film of the present invention has the following relationship (2) with the thickness of the (B) layer. It is preferable to be determined so as to satisfy. 50 / X ⁇ Y ⁇ 600 / X (2)
- the multilayer elastic film of the present invention has the (A) layer and the (B) layer.
- the layer structure in the multilayer elastic film of the present invention is not particularly limited, and the number and type of the (A) layer and (B) layer are not particularly limited.
- a two-layer configuration of (A) layer / (B) layer composed of one (A) layer and one (B) layer may be used, and one (A) layer and two ( A three-layer structure of (B) layer / (A) layer / (B) layer composed of B) layers may be used.
- the multilayer elastic film of the present invention may include an arbitrary layer such as an adhesive layer as necessary. From the viewpoint of moldability, continuous moldability, and elastic recovery rate, a three-layer structure of (B) layer / (A) layer / (B) layer is preferable.
- the thickness of the (A) layer in the multilayer elastic film of the present invention is not particularly limited, but from the viewpoint of the elastic recovery rate, it is 90% by mass or more, preferably 95% by mass or more with respect to the total mass of the multilayer elastic film.
- (B) It is preferable to determine in consideration of the material and thickness of the layer.
- the thickness of the (B) layer in the multilayer elastic film of the present invention is related to the crystallinity of the resin or resin composition constituting the (B) layer from the viewpoint of moldability, continuous moldability and elastic recovery rate. It is determined so as to satisfy the formula (1).
- the thickness of each layer is (B) layer thickness / (A) layer thickness / (B )
- the thickness of the layer is preferably 1 to 25 ⁇ m / 40 to 95 ⁇ m / 1 to 25 ⁇ m, preferably 5 to 20 ⁇ m / 60 to 90 ⁇ m / 5 to 20 ⁇ m.
- T-die method is a molding method in which a resin is melted in an extruder, a film-like molten resin is extruded from a slit of the T-die, and then cooled while being cooled with a roll or air.
- a resin is melted in an extruder, a film-like molten resin is extruded from a slit of the T-die, and then cooled while being cooled with a roll or air.
- the multilayer elastic film of the present invention has the (B) layer, it can be continuously formed without being attached.
- a molten resin is extruded from a nozzle, the extruded resin is cooled with air, stretched and spun, and the yarn is deposited, and then embossed to form. That is, since the cooled yarn accumulates on the collecting surface, it does not stick to the collecting surface.
- an extruder type melt extruder equipped with a single screw or twin screw can be used.
- the melt extrusion temperature is preferably 150 to 300 ° C, more preferably 180 to 250 ° C.
- melt-kneading using a melt-extrusion apparatus it is preferable to perform the melt-kneading under reduced pressure or the melt-kneading under nitrogen stream from a viewpoint of coloring suppression.
- the discharge pressure of the extruder may be used as it is, or a gear pump may be installed after the extruder and transferred by the gear pump. Therefore, it is preferable to use a gear pump.
- the molten thermoplastic resin transferred by the gear pump is preferably filtered in order to remove foreign matters that cause defects and improve the quality of the film.
- the filtration accuracy is preferably 50 ⁇ m or more, more preferably 10 ⁇ m or more, and even more preferably 5 ⁇ m or more. When the filtration accuracy is rough, defects due to foreign matters occur in the film, and it may not be used as an optical film. The finer the filtration accuracy, the better from the viewpoint of film quality.
- Filtration can be performed at a temperature of 150 ° C. or higher and 250 ° C. or lower.
- the filter can be appropriately selected and used from, for example, sintered metal, porous ceramic, sand, and wire mesh.
- the multilayer elastic film of the present invention is preferably a three-layer laminated film by coextrusion.
- each resin is measured with a gear pump and then laminated using a pinol or a feed block.
- a method of laminating in a die like a multi-manifold is preferable from the viewpoint of stacking accuracy of the apparatus and maintainability.
- the feed block part is preferably installed immediately before the base in order to increase the lamination accuracy.
- the multilayer elastic film obtained by coextrusion can be further stretched by uniaxial stretching or biaxial stretching to obtain a multilayer elastic film in which the (A) layer and the (B) layer are co-stretched.
- the stretching method include continuous biaxial stretching by a tenter method, simultaneous biaxial stretching by a tenter method, and simultaneous biaxial stretching by an inflation method.
- a batch-type biaxial stretching apparatus may be used.
- the coextrusion stretch ratio can be appropriately determined according to the use of the multilayer elastic film, but it is uniaxially stretched 2 to 9 times in the machine direction (MD) and / or the direction perpendicular to the machine direction (TD). Axial stretching is preferred.
- the multilayer elastic film of the present invention has high elastic recovery, and the elastic recovery rate is preferably 60% or more, more preferably 70% or more.
- the measurement of the elastic recovery rate in this specification was performed by the method as described in an Example.
- the multilayer elastic film of the present invention can be used for various applications.
- the elastic laminate product obtained by laminating the multilayer elastic film of the present invention on a non-woven fabric is not particularly limited.
- the elastic properties of sanitary materials such as disposable diaper members, diaper cover elastic members, sanitary products members, etc. Materials, elastic tape, adhesive bandages, elastic materials for clothing, hats, gloves, supporters, bases for poultices, anti-slip base fabrics, vibration absorbers, finger sack, air filters for clean rooms, separators, food packaging materials, cushions Materials, backing materials, bags and the like.
- Apparatus JNM-EX400 type 13 C-NMR apparatus manufactured by JEOL Ltd.
- Method Proton complete decoupling method Concentration: 220 mg / ml
- Solvent 90:10 (volume ratio) mixed solvent of 1,2,4-trichlorobenzene and heavy benzene Temperature: 130 ° C Pulse width: 45 ° Pulse repetition time: 4 seconds Integration: 10,000 times
- Production Example 1 [Production of polypropylene (A)] Into a stainless steel reactor with an internal volume of 20 L equipped with a stirrer, 20 L / h of n-heptane, 15 mmol / h of triisobutylaluminum, dimethylanilinium tetrakispentafluorophenylborate and (1,2'-dimethylsilylene) A catalyst component obtained by previously contacting (2,1′-dimethylsilylene) -bis (3-trimethylsilylmethylindenyl) zirconium dichloride, triisobutylaluminum and propylene in a mass ratio of 1: 2: 20, It was continuously supplied at 6 ⁇ mol / h in terms of zirconium.
- the polymerization temperature was set to 67 ° C., and propylene and hydrogen were continuously supplied so that the hydrogen concentration in the gas phase portion of the reactor was maintained at 0.8 mol% and the total pressure in the reactor was maintained at 0.7 MPaG.
- a polymerization reaction was performed.
- Irganox 1010 manufactured by BASF
- Example 1 [Production of 2 types, 3 layers film]
- (A) Polypropylene (A) is used as the resin constituting the layer
- (B) the resin composition comprising 50% by mass of polypropylene (A) and 50% by mass of polypropylene (B1) is used as the resin composition constituting the layer.
- the resin constituting the (A) layer and the resin composition constituting the (B) layer were each extruded using two 65 mm ⁇ single screw extruders (set temperature 190 ° C.), and the laminated structure was (B) layer / (A) After laminating via a feed block to be a layer / (B) layer, it was extruded into a film via a T-die (set temperature 200 ° C.).
- This film was cooled so that one side was completely adhered to a 20 ° C. cooling roll to obtain an unstretched multilayer elastic film.
- the lip gap of the T die was 0.8 mm.
- the thickness ratio of the layer (B) / (A) layer / (B) layer was adjusted to 0.5 / 9 / 0.5 by adjusting the discharge rate.
- the thickness of each layer was 5 ⁇ m / 90 ⁇ m / 5 ⁇ m.
- Example 2 In Example 1, the resin composition constituting the (B) layer was changed to a resin composition comprising 80% by mass of polypropylene (A) and 20% by mass of polypropylene (B1), and the thickness of the (B) layer was 22 ⁇ m, (A) A multilayer elastic film was produced in the same manner as in Example 1 except that the thickness of the layer was changed to 58 ⁇ m.
- Example 3 A multilayer elastic film was produced in the same manner as in Example 2, except that the thickness of (B) was changed to 5 ⁇ m and the thickness of the (A) layer was changed to 68 ⁇ m.
- Example 4 In Example 1, the resin composition constituting the layer (B) was changed to a resin composition comprising 90% by mass of polypropylene (A), 9.5% by mass of polypropylene (B1), and 0.5% by mass of the AB agent. A multilayer elastic film was produced in the same manner as in Example 1 except that.
- Example 5 In Example 1, a multilayer elastic film was produced in the same manner as in Example 1 except that the resin constituting the layer (B) was changed to polypropylene (B2).
- Example 6 In Example 1, the resin constituting the layer (B) was changed to an ethylene-octene copolymer, except that the thickness of the layer (B) was changed to 2.8 ⁇ m and the thickness of the layer (A) was changed to 44 ⁇ m.
- a multilayer elastic film was produced in the same manner as in Example 1.
- Example 7 From the multilayer elastic film obtained in Example 2, JIS K-7113-2 No. 1/2 test piece was sampled in the machine direction (MD). Using a tensile tester (manufactured by Shimadzu Corporation, trade name: Autograph AG-I), it was stretched to MD at a strain rate of 100 mm / min twice at room temperature and then the load was removed and left at room temperature for 24 hours. Thus, a stretched multilayer elastic film was produced. As a result of cross-sectional observation of the stretched film, the thickness of each layer was 17.6 ⁇ m / 46.4 ⁇ m / 17.6 ⁇ m.
- Example 8 A multilayer elastic film was produced in the same manner as in Example 2, except that the thickness of the (B) layer was changed to 18 ⁇ m and the thickness of the (A) layer was changed to 67 ⁇ m.
- Example 9 A multilayer elastic film was produced in the same manner as in Example 2, except that the thickness of the (B) layer was changed to 8 ⁇ m and the thickness of the (A) layer was changed to 72 ⁇ m.
- Comparative Example 1 A multilayer elastic film was produced in the same manner as in Example 2, except that the thickness of the (B) layer was changed to 30 ⁇ m and the thickness of the (A) layer was changed to 40 ⁇ m.
- Comparative Example 2 A multilayer elastic film was produced in the same manner as in Example 1 except that the thickness of the layer (B) was changed to 20 ⁇ m and the thickness of the layer (A) was changed to 60 ⁇ m.
- Comparative Example 3 A multilayer elastic film was produced in the same manner as in Example 5 except that the thickness of the (B) layer was changed to 15 ⁇ m and the thickness of the (A) layer was changed to 70 ⁇ m.
- the lip gap of the T die was 0.8 mm.
- the lamination ratio of the film was adjusted such that the thickness ratio of (B) layer / (A) layer / (B) layer was 1/8/1 by adjusting the discharge amount.
- the thickness of each layer was 10 ⁇ m / 80 ⁇ m / 10 ⁇ m.
- Example 2 and Comparative Example 1 when Example 2 and Comparative Example 1 are compared with each other, the resin constituting the (A) layer and the resin composition constituting the (B) layer are the same, and the resin composition constituting the (B) layer. Have the same crystallinity of 11.4%, and the thickness of each layer is different.
- the elastic recovery rate is as low as MD53% and TD50%.
- Example 2 and Comparative Example 2 when Example 2 and Comparative Example 2 are compared, the resin constituting the layer (A) is the same, the thickness of each layer is substantially equal, and the composition and crystal of the resin composition constituting the layer (B) The degree of conversion is different.
- the elastic recovery is as low as MD44% and TD42%.
- the film when forming into a film, the film is used when a resin is attached to a molding machine or wound into a roll. Although there is a problem that the films cannot be pulled apart due to blocking each other, the multilayer elastic films of the examples have no such problem and can be continuously formed.
- the multilayer elastic film of the present invention is excellent in elastic recovery and can be suitably used in the field of elastic members for sanitary articles such as disposable diapers and sanitary napkins.
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Abstract
Description
また、特許文献2に開示されたポリプロピレン系フィルムを構成するプロピレン重合体は、結晶化速度が遅くガラス転移温度が室温よりも低いため、フィルムに成形する際、成形機に樹脂が貼り付いたり、ロール状に巻き取るときにフィルム同士のブロッキングによりフィルムを引き離すことが不可能となったりする等の問題があり、連続成形が困難である。
本発明が解決しようとする課題は、優れた弾性回復性を有し、かつ、連続成形が可能な多層弾性フィルムを提供することにある。
(a)[mmmm]=20~60モル%
(b)[rrrr]/(1-[mmmm])≦0.1
(c)[rmrm]>2.5モル%
(d)[mm]×[rr]/[mr]2≦2.0
Y≦600/X・・・(1)
Y=(B)層を構成する樹脂又は樹脂組成物の結晶化度(%)
X=(B)層の厚みの合計/多層弾性フィルム全体の厚み×100(%)
(a)[mmmm]=20~60モル%
(b)[rrrr]/(1-[mmmm])≦0.1
(c)[rmrm]>2.5モル%
(d)[mm]×[rr]/[mr]2≦2.0
Y≦600/X・・・(1)
Y=(B)層を構成する樹脂又は樹脂組成物の結晶化度(%)
X=(B)層の厚みの合計/多層弾性フィルム全体の厚み×100(%)
本発明の多層弾性フィルムにおける(A)層は、下記(a)~(d)を満たすポリプロピレン(A)からなる。
(a)[mmmm]=20~60モル%
(b)[rrrr]/(1-[mmmm])≦0.1
(c)[rmrm]>2.5モル%
(d)[mm]×[rr]/[mr]2≦2.0
さらにポリプロピレン(A)は、下記(e)及び(f)を満たすことが好ましい。
(e)重量平均分子量(Mw)が10万~50万であり、かつ、分子量分布(Mw/Mn)<4
(f)メルトフローレート(MFR)≦100g/10min
(a)メソペンタッド分率[mmmm]
メソペンタッド分率[mmmm]は、ポリプロピレンの立体規則性を表す指標であり、メソペンタッド分率[mmmm]が大きくなると、立体規則性が高くなる。
本発明に用いられるポリプロピレン(A)のメソペンタッド分率[mmmm]は、20~60モル%であり、好ましくは30~50モル%、より好ましくは40~50モル%である。メソペンタッド分率[mmmm]が20モル%以上であると、べたつきの発生が抑制され、60モル%以下であると、結晶化度が高くなりすぎることがないので、弾性回復性が良好となる。
なお、本明細書における13C-NMRスペクトルの測定は、実施例に記載の方法にて行った。
[rrrr]/(1-[mmmm])の値は、メソペンタッド分率[mmmm]及びラセミペンタッド分率[rrrr]から求められ、ポリプロピレンの規則性分布の均一さを示す指標である。[rrrr]/(1-[mmmm])の値が大きいほど規則性分布が広がり、べたつきの原因となる。
本発明に用いられるポリプロピレン(A)において、[rrrr]/(1-[mmmm])の値は、べたつきを抑制する観点から、0.1以下であり、好ましくは0.05以下、より好ましくは0.04以下である。
ラセミメソラセミメソ分率[rmrm]は、ポリプロピレンの立体規則性のランダム性を表す指標であり、値が大きいほどポリプロピレンのランダム性が増加する。
本発明に用いられるポリプロピレン(A)のラセミメソラセミメソ分率[rmrm]は、2.5モル%を超え、好ましくは2.6モル%以上、より好ましくは2.7モル%以上である。その上限は、通常10モル%程度である。ラセミメソラセミメソ分率[rmrm]が2.5モル%以上であると、ポリプロピレンの立体規則性のランダム性が増加し、弾性回復性が更に向上する。
トリアッド分率[mm]、[rr]及び[mr]から算出される[mm]×[rr]/[mr]2の値は、ポリプロピレンの立体規則性のランダム性を示す指標であり、0.25に近いほどランダム性が高くなる。
本発明に用いられるポリプロピレン(A)において、[mm]×[rr]/[mr]2の値は、2.0以下であり、好ましくは1.8以下、更に好ましくは1.5以下である。この値が2.0を超える場合には十分な弾性回復性が得られない。この値は、0.25に近いほど、ポリプロピレンの立体規則性が高く弾性回復性が向上するため好ましい。
本発明に用いられるポリプロピレン(A)において、重量平均分子量(Mw)は、成形加工性の観点及びべたつきの発生を抑制する観点から、好ましくは10万~50万、より好ましくは15万~25万であり、更に好ましくは18万~22万である。また、分子量分布(Mw/Mn)は、べたつきの発生を抑制する観点から、好ましくは4未満、より好ましくは3以下である。
本発明において、重量平均分子量(Mw)は、ゲルパーミエイションクロマトグラフィ(GPC)法により、下記の装置及び条件で測定したポリスチレン換算の重量平均分子量である。また、分子量分布(Mw/Mn)は、同様にして測定した数平均分子量(Mn)及び重量平均分子量(Mw)より算出した値である。なお、本明細書におけるGPC測定は、実施例に記載の方法にて行った。
MFRは、重合体の流動性を示す指標で、値が大きいほど流動性が高い。本明細書におけるMFRは、JIS K7210に準拠し、温度230℃、加重21.18Nの条件で測定された値である。
本発明に用いられるポリプロピレン(A)のMFRは、成形加工性及び他層との積層ムラの観点から、好ましくは100g/10min以下、より好ましくは1.0~60g/10minである。
本発明に用いられるポリプロピレン(A)は、例えば、国際公開第2003/087172号、特開2010-168713号公報等に記載されているような、いわゆるメタロセン触媒と呼ばれる均一系の触媒を用いて合成することができる。
また、市販のポリプロピレンを本発明におけるポリプロピレン(A)として用いることができ、例えば、エルモーデュX901S(商品名、出光興産(株)製)を用いることができる。
本発明の多層弾性フィルムにおける(B)層は、ポリオレフィン系樹脂又は樹脂組成物からなる。
ポリオレフィン系樹脂としては、成形加工性の観点から、ポリエチレン、ポリプロピレン(ポリプロピレン(A)を除く)、エチレンと炭素数3~8のオレフィンとの共重合体、プロピレンと炭素数4~8のオレフィンとの共重合体、又はそれらのブレンドであるポリオレフィン(B)が好ましい。エチレンと炭素数3~8のオレフィンとの共重合体の具体例としては、例えばエチレン-オクテン共重合体が挙げられる。
ポリオレフィン(B)としては市販品を用いることができ、例えばエチレン-オクテン共重合体(デュポン ダウ エラストマー社製、商品名:Engage8407)等を用いることができる。
これらの中でも、成形時の取扱い性の観点から、アンチブロッキング剤を含有することが好ましい。アンチブロッキング剤としては特に限定されず、シリカ系、ゼオライト系、ポリマービーズ等、種々のアンチブロッキング剤を使用することができ、例えば合成シリカ系アンチブロッキング剤(富士シリシア(株)製、商品名:サイロホービック)を好適に使用することができる。
樹脂組成物におけるアンチブロッキング剤の含有量は、樹脂組成物基準で好ましくは1000~10000質量ppm、より好ましくは1000~5000質量ppmである。
本発明の多層弾性フィルムの(B)層を構成するポリオレフィン系樹脂又は樹脂組成物は、MFRが、成形加工性及び他層との積層ムラの観点から、好ましくは100g/10min以下、より好ましくは1.0~60g/10min、更に好ましくは2.0~40g/10min、更に好ましくは3.0~30g/10minである。MFRは、JIS K7210に準拠し、温度230℃、加重21.18Nの条件で測定された値である。
結晶化度は、樹脂又は樹脂組成物の硬さを示す指標である。なお、本明細書における結晶化度の測定は、実施例に記載の方法にて行った。
本発明の多層弾性フィルムの(B)層を構成するポリオレフィン系樹脂又は樹脂組成物の結晶化度は、成形加工性、連続成形性及び弾性回復率の観点から、(B)層の厚みとの関係が下記式(1)を満たすように決定される。
Y≦600/X・・・(1)
Y=(B)層を構成する樹脂又は樹脂組成物の結晶化度(%)
X=(B)層の厚みの合計/多層弾性フィルム全体の厚み×100(%)
式(1)は、(B)層として結晶化度の高い樹脂又は樹脂組成物を用いる場合には、(B)層は硬く伸縮性が低いため、フィルムの弾性回復率の観点から(B)層の厚みを薄くすることが求められること、並びに(B)層として結晶化度の低い樹脂又は樹脂組成物を用いる場合には、(B)層は軟らかいため、(B)層の厚みを厚くしてもよいことを意味する。
(B)層を構成する樹脂又は樹脂組成物の結晶化度は、適宜設定することができ、結晶化度の高い樹脂とポリプロピレン(A)のような結晶化度の低い樹脂とを混合して調整してもよい。また、(B)層が複数の異なる層で構成される場合は、(B)層全体の結晶化度の平均値が、上記(1)式を満たせばよい。
本発明の多層弾性フィルムの(B)層を構成するポリオレフィン系樹脂又は樹脂組成物の結晶化度は、成形加工性の観点からは、(B)層の厚みとの関係が下記式(2)を満たすように決定されることが好ましい。
50/X≦Y≦600/X・・・(2)
本発明の多層弾性フィルムは、前記(A)層と前記(B)層とを有する。本発明の多層弾性フィルムにおける層構成は特に限定されず、(A)層及び(B)層の数や種類は特に限定されない。例えば、1層の(A)層及び1層の(B)層からなる(A)層/(B)層の2層構成であってもよく、1層の(A)層及び2層の(B)層からなる(B)層/(A)層/(B)層の3層構成であってもよい。さらに、本発明の多層弾性フィルムは、必要に応じて接着層等の任意の層を含んでもよい。成形加工性、連続成形性及び弾性回復率の観点からは、(B)層/(A)層/(B)層の3層構成であることが好ましい。
本発明の多層弾性フィルムにおける(B)層の厚みは、成形加工性、連続成形性及び弾性回復率の観点から、(B)層を構成する樹脂又は樹脂組成物の結晶化度との関係が前記式(1)を満たすように決定される。
本発明の多層弾性フィルムが(B)層/(A)層/(B)層の3層構成である場合、各層の厚みは、(B)層の厚み/(A)層の厚み/(B)層の厚みが、好ましくは1~25μm/40~95μm/1~25μm、好ましくは5~20μm/60~90μm/5~20μmである。
本発明の多層弾性フィルムの製造方法については特に限定されず、Tダイ法による共押出等、任意の方法で製造することができる。Tダイ法は、押出機内で樹脂を溶融させ、Tダイのスリットからフィルム状の溶融樹脂を押出した後、ロールやエアー等で冷却しつつ引き取る成形法である。
ところで、フィルム成形では、上記Tダイ法のように溶融樹脂をロール等により冷却することが一般的である。しかし、前記ポリプロピレン(A)のみからなるフィルムを製造する場合、結晶化速度が遅くガラス転移温度が室温よりも低いため、冷却の際にロール等に樹脂が貼り付き、連続成形が困難となる場合がある。これに対し、本発明の多層弾性フィルムでは前記(B)層を有するため、貼り付くことなく連続成形が可能である。
ちなみに、不織布の成形では、溶融樹脂をノズルから押出し、押し出した樹脂を空気で冷却、延伸させて紡糸し、その糸を堆積させた後、エンボス加工を施して成形する。すなわち、冷却された糸が捕集面に堆積するので、捕集面に貼り付くことはない。
濾過精度は、好ましくは50μm以上、より好ましくは10μm以上、更に好ましくは5μm以上の異物を除去することが好ましい。濾過精度が粗いと、フィルムに異物起因の欠点が発生し、光学用フィルムとして使用できない場合がある。濾過精度は細かいほどフィルム品位の観点からは好ましいが、細かすぎると濾圧の上昇により製膜が困難になる場合がある。濾過精度の異なる複数のフィルターにより段階的に濾過を行うと濾過寿命が延長されるため好ましい。濾過は、150℃以上250℃以下の温度で行うことができる。フィルターは、例えば、焼結金属、多孔性セラミック、サンド、金網等の中から適宜選択し用いることができる。
・ポリプロピレン(B1):プライムポリマー(株)製、商品名:F300SP
・ポリプロピレン(B2):プライムポリマー(株)製、商品名:F704NP
・ポリプロピレン(B3):プライムポリマー(株)製、商品名:F744NP
・AB剤:合成シリカ系アンチブロッキング剤(富士シリシア(株)製、商品名:サイロホービック)
・エチレン-オクテン共重合体:デュポン ダウ エラストマー社製、商品名:Engage8407
13C-NMRスペクトルの測定は、エイ・ザンベリ(A.Zambelli)等により「Macromolecules,8,687(1975)」で提案されたピークの帰属に従い、下記の装置及び条件にて行った。
方法:プロトン完全デカップリング法
濃度:220mg/ml
溶媒:1,2,4-トリクロロベンゼンと重ベンゼンの90:10(容量比)混合溶媒
温度:130℃
パルス幅:45°
パルス繰り返し時間:4秒
積算:10000回
M=m/S×100
R=γ/S×100
S=Pββ+Pαβ+Pαγ
S:全プロピレン単位の側鎖メチル炭素原子のシグナル強度
Pββ:19.8~22.5ppm
Pαβ:18.0~17.5ppm
Pαγ:17.5~17.1ppm
γ:ラセミペンタッド連鎖:20.7~20.3ppm
m:メソペンタッド連鎖:21.7~22.5ppm
下記の装置及び条件にて、ポリスチレン換算値として重量平均分子量(Mw)及び数平均分子量(Mn)を測定した。
<GPC測定装置>
カラム :TOSO GMHHR-H(S)HT(商品名、東ソー(株)製)
検出器 :液体クロマトグラム用RI検出器(ウォーターズ・コーポレーション製、商品名:WATERS 150C)
<測定条件>
溶媒 :1,2,4-トリクロロベンゼン
測定温度 :145℃
流速 :1.0ml/分
試料濃度 :2.2mg/ml
注入量 :160μl
検量線 :Universal Calibration
解析プログラム:HT-GPC(Ver.1.0)
JIS K7210に準拠し、温度230℃、加重21.18Nの条件で測定した。
示差走査型熱量計(パーキン・エルマー社製、商品名:DSC-7)を用い、試料10mgを窒素雰囲気下220℃で5分間保持し、10℃/分で-40℃まで降温させた。-40℃で5分間保持し、10℃/分で220℃まで昇温させることにより得られた融解吸熱カーブの面積から融解熱容量ΔHを求め、下記式から結晶化度(%)を算出した。
結晶化度(%)=ΔH/ΔHm 0×100
式中、ΔHm 0は完全結晶の融解熱容量を表し、ポリプロピレンでは209J/gである。
〔ポリプロピレン(A)の製造〕
撹拌機付きの内容積20Lのステンレス製反応器に、n-ヘプタンを20L/h、トリイソブチルアルミニウムを15mmol/h、さらに、ジメチルアニリニウムテトラキスペンタフルオロフェニルボレートと(1,2’-ジメチルシリレン)(2,1’-ジメチルシリレン)-ビス(3-トリメチルシリルメチルインデニル)ジルコニウムジクロライドとトリイソブチルアルミニウムとプロピレンとを質量比1:2:20で、事前に接触させて得られた触媒成分を、ジルコニウム換算で6μmol/hで連続供給した。
重合温度を67℃に設定し、反応器の気相部の水素濃度が0.8モル%、反応器内の全圧が0.7MPaGに保たれるように、プロピレンと水素を連続供給し、重合反応を行った。
得られた重合溶液に、安定剤としてイルガノックス1010(BASF社製)をその含有割合が500質量ppmになるように添加し、次いで溶媒であるn-ヘプタンを除去することにより、ポリプロピレン(A)を得た。
得られたポリプロピレン(A)について、上述した方法により、メソペンタッド分率[mmmm]、[rrrr]/(1-[mmmm])の値、ラセミメソラセミメソ分率[rmrm]、[mm]×[rr]/[mr]2の値、重量平均分子量(Mw)、分子量分布(Mw/Mn)、MFR及び融解熱容量ΔHを測定した。結果を表1に示す。
〔2種3層フィルムの製造〕
(A)層を構成する樹脂としてポリプロピレン(A)を使用し、(B)層を構成する樹脂組成物としてポリプロピレン(A)50質量%及びポリプロピレン(B1)50質量%からなる樹脂組成物を使用した。
(A)層を構成する樹脂及び(B)層を構成する樹脂組成物をそれぞれ65mmφの一軸押出機(設定温度190℃)を2台用いて押し出し、積層構成が(B)層/(A)層/(B)層となるフィードブロックを介して積層した後、Tダイ(設定温度200℃)を介してフィルム状に押し出した。このフィルムを、20℃の冷却ロールに片面を完全に接着させるようにして冷却して、未延伸の多層弾性フィルムを得た。このとき、Tダイのリップ間隙は0.8mmであった。フィルムの積層比は、吐出量を調整することで、(B)層/(A)層/(B)層の厚み比が0.5/9/0.5となるようにした。フィルムの断面観察の結果、各層の厚みは5μm/90μm/5μmであった。
実施例1において、(B)層を構成する樹脂組成物を、ポリプロピレン(A)80質量%及びポリプロピレン(B1)20質量%からなる樹脂組成物に変更し、(B)層の厚みを22μm、(A)層の厚みを58μmに変更したこと以外は実施例1と同様にして、多層弾性フィルムを製造した。
実施例2において、(B)の厚みを5μm、(A)層の厚みを68μmに変更したこと以外は実施例2と同様にして、多層弾性フィルムを製造した。
実施例1において、(B)層を構成する樹脂組成物を、ポリプロピレン(A)90質量%、ポリプロピレン(B1)9.5質量%及びAB剤0.5質量%からなる樹脂組成物に変更したこと以外は実施例1と同様にして、多層弾性フィルムを製造した。
実施例1において、(B)層を構成する樹脂をポリプロピレン(B2)に変更したこと以外は実施例1と同様にして、多層弾性フィルムを製造した。
実施例1において、(B)層を構成する樹脂をエチレン-オクテン共重合体に変更し、(B)層の厚みを2.8μm、(A)層の厚みを44μmに変更したこと以外は実施例1と同様にして、多層弾性フィルムを製造した。
実施例2で得られた多層弾性フィルムから、JIS K-7113-2号1/2試験片を、機械方向(MD)についてサンプリングした。引張試験機((株)島津製作所製、商品名:オートグラフAG-I)を用いて、室温でMDにひずみ速度100mm/minで2倍に延伸した後、荷重を取り除き24時間室温で静置して、延伸多層弾性フィルムを製造した。なお、延伸後のフィルムの断面観察の結果、各層の厚みは17.6μm/46.4μm/17.6μmであった。
実施例2において、(B)層の厚みを18μm、(A)層の厚みを67μmに変更したこと以外は実施例2と同様にして、多層弾性フィルムを製造した。
実施例2において、(B)層の厚みを8μm、(A)層の厚みを72μmに変更したこと以外は実施例2と同様にして、多層弾性フィルムを製造した。
実施例2において、(B)層の厚みを30μm、(A)層の厚みを40μmに変更したこと以外は実施例2と同様にして、多層弾性フィルムを製造した。
実施例1において、(B)層の厚みを20μm、(A)層の厚みを60μmに変更したこと以外は実施例1と同様にして、多層弾性フィルムを製造した。
実施例5において、(B)層の厚みを15μm、(A)層の厚みを70μmに変更したこと以外は実施例5と同様にして、多層弾性フィルムを製造した。
(A)層を構成する樹脂としてポリプロピレン(A)を使用し、(B)層を構成する樹脂組成物としてポリプロピレン(B2)及びポリプロピレン(B3)を使用した。
(A)層を構成する樹脂及び(B)層を構成する2種の樹脂をそれぞれ65mmφの一軸押出機(設定温度190℃)を3台用いて押し出し、積層構成が(B)層/(A)層/(B)層となるフィードブロックを介して積層した後、Tダイ(設定温度200℃)を介してフィルム状に押し出した。このフィルムを、20℃の冷却ロールに片面を完全に接着させるようにして冷却して、未延伸の多層弾性フィルムを得た。このとき、Tダイのリップ間隙は0.8mmであった。フィルムの積層比は、吐出量を調整することで、(B)層/(A)層/(B)層の厚み比が1/8/1となるようにした。フィルムの断面観察の結果、各層の厚みは10μm/80μm/10μmであった。
実施例1~9及び比較例1~4で得られた多層弾性フィルムから、JIS K-7113-2号1/2試験片を、機械方向(MD)及び機械方向に対して垂直方向(TD)についてそれぞれサンプリングした。引張試験機((株)島津製作所製、商品名:オートグラフAG-I)を用いて、初期長L0を40mmに設定し、歪みが0%から100%となるまで速度100mm/minで3回伸縮させた。3回目の伸張の際、応力が発生した長さをL(mm)とした。弾性回復率(%)は下記式から算出した。
弾性回復率(%)=(100-L)/L0×100
弾性回復率の測定結果を表2に示す。
また、実施例2と比較例2とを比較すると、両者は(A)層を構成する樹脂が同一であり、各層の厚みがほぼ等しく、(B)層を構成する樹脂組成物の組成及び結晶化度が異なる。(B)層を構成する樹脂組成物の結晶化度(Y)が11.4%である実施例2では、弾性回復率がMD=70%、TD=66%であるのに対して、(B)層を構成する樹脂組成物の結晶化度(Y)が24.3%である比較例2では、弾性回復率がMD44%、TD42%と低い。
表2及び図1から、(A)層として伸縮性に優れるポリプロピレン(A)を用いたとしても、(B)層の厚みと(B)層を構成する樹脂又は樹脂組成物の結晶化度との関係が前記式(1)を満たさない場合には、所望の弾性回復率を有する多層弾性フィルムが得られないことがわかる。
また、ポリプロピレン(A)のみからなるフィルムは、結晶化速度が遅くガラス転移温度が室温よりも低いため、フィルムに成形する際、成形機に樹脂が貼り付いたり、ロール状に巻き取るときにフィルム同士のブロッキングによりフィルムを引き離すことが不可能となったりする等の問題があるが、これに対して、実施例の多層弾性フィルムは、そのような問題がなく、連続成形が可能であった。
Claims (6)
- 下記(a)~(d)を満たすポリプロピレン(A)からなる(A)層と、ポリオレフィン系樹脂又は樹脂組成物からなる(B)層とを有し、かつ、下記式(1)を満たす、多層弾性フィルム。
(a)[mmmm]=20~60モル%
(b)[rrrr]/(1-[mmmm])≦0.1
(c)[rmrm]>2.5モル%
(d)[mm]×[rr]/[mr]2≦2.0
Y≦600/X・・・(1)
Y=(B)層を構成する樹脂又は樹脂組成物の結晶化度(%)
X=(B)層の厚みの合計/多層弾性フィルム全体の厚み×100(%) - 前記ポリプロピレン(A)の含有量が、前記多層弾性フィルムの全質量に対して90質量%以上である、請求項1に記載の多層弾性フィルム。
- 前記ポリオレフィン系樹脂がポリオレフィン(B)であり、前記ポリオレフィン系樹脂組成物が前記ポリプロピレン(A)0~95質量%とポリオレフィン(B)5~100質量%とからなる樹脂成分を含有する樹脂組成物であり、前記ポリオレフィン(B)が、ポリエチレン、ポリプロピレン(ポリプロピレン(A)を除く)、エチレンと炭素数3~8のオレフィンとの共重合体、プロピレンと炭素数4~8のオレフィンとの共重合体、又はそれらのブレンドである、請求項1又は2に記載の多層弾性フィルム。
- 前記の(B)層を構成するポリオレフィン系樹脂組成物が、アンチブロッキング剤を樹脂組成物基準で1000~10000質量ppm含有する、請求項1~3のいずれかに記載の多層弾性フィルム。
- 一軸又は二軸延伸して得られる延伸多層弾性フィルムである、請求項1~4のいずれかに記載の多層弾性フィルム。
- 請求項1~5のいずれかに記載の多層弾性フィルムを不織布にラミネートして得られる弾性ラミネート製品。
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WO2015005374A1 (ja) * | 2013-07-09 | 2015-01-15 | 出光興産株式会社 | 弾性フィルム |
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CN107635766B (zh) | 2015-05-01 | 2020-08-14 | 艾利丹尼森公司 | 高光学性质的纵向取向标签面材 |
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US20140106638A1 (en) | 2014-04-17 |
EP2716449A1 (en) | 2014-04-09 |
EP2716449A4 (en) | 2015-01-14 |
JPWO2012165438A1 (ja) | 2015-02-23 |
EP2716449B1 (en) | 2016-06-29 |
JP5820879B2 (ja) | 2015-11-24 |
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