EP2094891A2 - Elastic spunbonded nonwoven and elastic nonwoven fabric comprising the same - Google Patents
Elastic spunbonded nonwoven and elastic nonwoven fabric comprising the sameInfo
- Publication number
- EP2094891A2 EP2094891A2 EP08785501A EP08785501A EP2094891A2 EP 2094891 A2 EP2094891 A2 EP 2094891A2 EP 08785501 A EP08785501 A EP 08785501A EP 08785501 A EP08785501 A EP 08785501A EP 2094891 A2 EP2094891 A2 EP 2094891A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- elastic
- nonwoven
- polymeric component
- filament
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004745 nonwoven fabric Substances 0.000 title claims description 69
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 41
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000011084 recovery Methods 0.000 claims abstract description 33
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims abstract description 29
- 239000000155 melt Substances 0.000 claims abstract description 21
- 239000004743 Polypropylene Substances 0.000 claims abstract description 17
- 229920001155 polypropylene Polymers 0.000 claims abstract description 15
- 229920000098 polyolefin Polymers 0.000 claims abstract description 14
- -1 polypropylene Polymers 0.000 claims abstract description 14
- 101100345332 Schizosaccharomyces pombe (strain 972 / ATCC 24843) mfr1 gene Proteins 0.000 claims abstract description 12
- 239000000178 monomer Substances 0.000 claims abstract description 11
- 101100023124 Schizosaccharomyces pombe (strain 972 / ATCC 24843) mfr2 gene Proteins 0.000 claims abstract description 9
- 239000004711 α-olefin Substances 0.000 claims abstract description 7
- 150000001336 alkenes Chemical class 0.000 claims abstract description 4
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229920000642 polymer Polymers 0.000 claims description 29
- 229920001577 copolymer Polymers 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 19
- 239000000126 substance Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 4
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 claims description 3
- 239000002131 composite material Substances 0.000 abstract description 16
- 238000000034 method Methods 0.000 description 27
- 230000008569 process Effects 0.000 description 24
- 239000004744 fabric Substances 0.000 description 14
- 239000000835 fiber Substances 0.000 description 13
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 238000009960 carding Methods 0.000 description 7
- 238000006116 polymerization reaction Methods 0.000 description 7
- 239000012968 metallocene catalyst Substances 0.000 description 6
- 229920006124 polyolefin elastomer Polymers 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000012815 thermoplastic material Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 239000012748 slip agent Substances 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 229920006125 amorphous polymer Polymers 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 229920005629 polypropylene homopolymer Polymers 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000013013 elastic material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012549 training Methods 0.000 description 3
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 239000004230 Fast Yellow AB Substances 0.000 description 2
- 229920001410 Microfiber Polymers 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000010044 bi-component spinning Methods 0.000 description 2
- MJBPUQUGJNAPAZ-AWEZNQCLSA-N butin Chemical compound C1([C@@H]2CC(=O)C3=CC=C(C=C3O2)O)=CC=C(O)C(O)=C1 MJBPUQUGJNAPAZ-AWEZNQCLSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000002074 melt spinning Methods 0.000 description 2
- 239000003658 microfiber Substances 0.000 description 2
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 2
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 2
- 229920005653 propylene-ethylene copolymer Polymers 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- MJBPUQUGJNAPAZ-UHFFFAOYSA-N Butine Natural products O1C2=CC(O)=CC=C2C(=O)CC1C1=CC=C(O)C(O)=C1 MJBPUQUGJNAPAZ-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229920006347 Elastollan Polymers 0.000 description 1
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 description 1
- 241000264877 Hippospongia communis Species 0.000 description 1
- 206010021639 Incontinence Diseases 0.000 description 1
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 125000003710 aryl alkyl group Chemical group 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 125000000058 cyclopentadienyl group Chemical group C1(=CC=CC1)* 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 229920001198 elastomeric copolymer Polymers 0.000 description 1
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- RMBPEFMHABBEKP-UHFFFAOYSA-N fluorene Chemical compound C1=CC=C2C3=C[CH]C=CC3=CC2=C1 RMBPEFMHABBEKP-UHFFFAOYSA-N 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000005227 gel permeation chromatography Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229940127554 medical product Drugs 0.000 description 1
- 239000004750 melt-blown nonwoven Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- NIHNNTQXNPWCJQ-UHFFFAOYSA-N o-biphenylenemethane Natural products C1=CC=C2CC3=CC=CC=C3C2=C1 NIHNNTQXNPWCJQ-UHFFFAOYSA-N 0.000 description 1
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 description 1
- 229940113162 oleylamide Drugs 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 229940037312 stearamide Drugs 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 229920002397 thermoplastic olefin Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/06—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyolefin as constituent
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/098—Melt spinning methods with simultaneous stretching
- D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H13/00—Other non-woven fabrics
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
- D04H3/147—Composite yarns or filaments
-
- 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]
- Y10T442/601—Nonwoven fabric has an elastic quality
- Y10T442/602—Nonwoven fabric comprises an elastic strand or fiber material
Definitions
- the present invention relates to a novel elastic spunbonded nonwoven made from multi-component filaments, and having a remarkable elastic recovery, and to an elastic nonwoven fabric comprising at least two superposed layers, one of which being constituted by the said novel elastic spunbonded nonwoven.
- Elastic nonwoven fabrics advantageously offer the ability to conform to irregular shapes, and thus enable to increase fit and to allow more freedom and comfort, for example to body movements, than other textile fabrics with more limited extensibility.
- Elastic nonwoven fabrics are thus widely used in many industrial applications.
- Elastic nonwoven fabrics are used in the hygienic and personal care industry for making, for example, disposable diapers, child swim pants, child training pants, adult incontinent garments, sanitary napkins, wipes and other personal care products.
- Elastic nonwoven fabrics are also used in the manufacture of medical products, such as, for example, gowns, linens, bandages, masks, heads wraps and drapes. Others additional applications of elastic nonwoven fabrics include consumer products, like seat covers and car covers.
- TPU thermoplastic polyurethane
- a further drawback of the use of elastomeric polymers such as TPU for making spunbonded nonwoven is their poor bonding ability, especially thermal-bonding ability, with the most used polyolefin materials.
- the first elastic polymeric component preferably comprises at least one elastomer that includes an elastic polypropylene ; the second polymeric component preferably comprises at least one polyolefin that is a linear low density polyethylene (LLDPE) having a density greater than 0.90 g/cc.
- LLDPE linear low density polyethylene
- the extensible conjugate fiber has a total heat of melting of less than 80 Joules per gram, and comprises: a. from 0.001% to about 20% by weight of the total fiber of a first component A which comprises at least a portion of the fiber surface, said first component A comprising a polypropylene homopolymer or a polypropylene copolymer, b. and a second component B which comprises an elastic propylene- based olefin polymer.
- Japanese patent application JP 11 323716 discloses an extensible spunbonded nonwoven fabric made of filaments of the eccentric sheath-core type. This spunbonded nonwoven fabric is extensible, but does not exhibit very high elastic properties, in particular high recovery. OBJECTIVE OF THE INVENTION
- the present invention proposes a novel elastic spunbonded nonwoven that overcomes the aforesaid problems inherent to the use of elastomeric polymers such as TPU, and that enables to achieve very high elastic properties.
- This spunbonded nonwoven comprises a plurality of multi-component filaments ; each multi-component filament comprises a first polymeric component (P) extending along the length of the filament in at least a first section of the filament, and a second polymeric component (P') extending along the length of the filament in at least a second section of the filament that is distinct from the first section.
- the said first polymeric component (P) comprises an elastic propylene- based olefin copolymer
- the said second polymeric component (P 1 ) comprises an elastic propylene-based olefin and has a melt flow rate MFR2 that is higher than the melt flow rate MFR1 of the first polymeric component.
- the elastic propylene-based olefin copolymer for the first polymeric component and for the second polymeric component comprises propylene and from 10 to 25 weight % of one or more C2 and/or C4 to C10 alpha-olefin co-monomers.
- multi-component filament means a filament that is formed by combining multiple extrudates in the filament resulting in a heterogeneous filament cross section wherein at least two sections are occupied by separate polymeric components along the entire length of the filament.
- the cross section of the multi-component filament may take different configurations such as side-by-side, sheath-core, eccentric sheath-core, and islands-in-the sea.
- Multi-component filaments are also commonly referred as "conjugate filaments”.
- the first polymeric component (P) can advantageously exhibit very high elastic properties, and in particular one can use an elastic polymeric component with a low melt flow rate that would be practically not spinnable alone.
- melt flow rates (MFR1, MFR2) of the first and second polymeric components standard method ASTM D-1238 can be used.
- copolymers means any polymer comprising two or more monomers, where the monomer present in the polymer is the polymerized form of the monomer.
- catalyst components are described as comprising neutral stable forms of the components, it is well understood that the active form of the component is the form that reacts with the monomers to produce polymers.
- polypropylene As used herein, the term "polypropylene”, “propylene polymer,” or “PP” refers to homopolymers, copolymers, terpolymers, and interpolymers, comprising from 50 to 100 weight % of propylene.
- “elastic propylene-based olefin copolymer” can be a single semi-amorphous copolymer or a blend of several semi- amorphous polymers, each semi-amorphous polymer comprising propylene and from 10 to 25 weight % of one or more C2 and/or C4 to C10 alpha-olefin co-monomers, preferably ethylene, wherein the copolymer comprises isotactically crystallizable alpha-olefin sequences.
- crystallizable describes those polymers or sequences which are mainly amorphous in the undeformed state, but upon stretching or annealing, crystallization occurs.
- the copolymer is an ethylene propylene copolymer, e. g., ethylene propylene thermoplastic elastomer.
- the copolymer has a substantially uniform composition distribution preferably as a result of polymerization with a metallocene catalyst. Composition distribution is a property of copolymers indicating a statistically significant intermolecular or intramolecular difference in the composition of the polymer.
- each semi-amorphous polymers has : a) heat of fusion of 4 to 70 J/g, as determined by Differential Scanning Calorimetry (DSC); b) a Melt Flow Rate of 0.1 to 2000 dg/min, most preferably greater than 2 dg/min and less than 100 dg/min, as measured by ASTM D-1238 at 230 0 C, and 2.16 kg.
- a semi-amorphous copolymer may be produced in a continuous solution process using a metallocene catalyst.
- a metallocene catalyst Preferably, copolymers having a narrow molecular weight distribution are used.
- a single sited metallocene catalyst is advantageously used, which allows only a single statistical mode of addition of the first and second monomer sequences, and the copolymer is advantageously well- mixed in a continuous flow stirred tank polymerization reactor, which allows only a single polymerization environment for substantially all of the polymer chains of the copolymer.
- Preferred semi-amorphous polymers useful in this invention preferably have a molecular weight distribution (Mw/Mn) of less than 5, preferably between 1 and 4.
- Mw/Mn molecular weight distribution
- Mn and Mw molecular weight distribution
- Mw/Mn molecular weight distribution
- a slip agent selected for example from the group consisting of: erucamide, oleylamide, oleamide, and stearamide and used in a concentration from 50 ppm to 10 weight % can be successful added.
- erucamide, oleylamide, oleamide, and stearamide used in a concentration from 50 ppm to 10 weight %.
- Preferred elastic propylene-based olefin copolymers suitable for the invention include thermoplastic elastic propylene-ethylene copolymers formed by using metallocene polymerization catalysis.
- Such polymers include those commercially available from ExxonMobil Chemical Co 1 Huston, TX under the trademark of VISTAMAXX®, e.g. Vistamaxx 2120 or Vistamaxx 2125 for second polymeric component in the sheath and a blend of Vistamaxx 2125 and Vistamaxx 6100 (or Vistamaxx 6102) for first polymeric component in the core.
- each multi-component filament comprises a core and an outer sheath; the core comprises the first polymeric component and the sheath comprises the second polymeric component.
- the ratio MFR2/MFR1 between the melt flow rates of the second and first polymeric components is higher than 1.5.
- the first polymeric component comprises a blend of at least two elastic propylene-based olefin copolymers of different melt flow rate (MFRIa and MFRIb).
- the elastic spunbonded nonwoven of the invention is further characterized by the following optional features that can be combined or taken alone :
- the elastic propylene-based olefin copolymer for the first polymeric component and for the second polymeric component is an ethylene propylene copolymer ;
- the elastic propylene-based olefin copolymer for the first polymeric component and for the second polymeric component has a melt flow rate of 0.1 to 2000 g/10min, most preferably greater than 2 g/10min and less than 100 g/10min, as measured by ASTM D-1238 at 230 0 C and 2.16 kg ;
- the elastic propylene-based olefin copolymer for the first polymeric component and for the second polymeric component has a molecular weight distribution (Mw/Mn) of less than 5, preferably between 1 and 4 ;
- the elastic propylene-based olefin copolymer for the first polymeric component and for the second polymeric component comprises at least 80wt% of propylene units ;
- the elastic propylene-based olefin copolymer for the first polymeric component and for the second polymeric component is a metallocene-catalysed polymer ;
- the spunbonded nowoven has a root mean square (RMS) average recovery of at least 85%, said RMS average recovery being calculated from the formula:
- RMS average recovery [1/2(R CD 2 + RMD 2 )] v ⁇
- R M D and RC D are recovery values (R) measured on a nonwoven specimen respectively in machine direction and cross direction, after 50% elongation and one pull, and calculated from the formula :
- R [(Ls-Lr) / (Ls-Lo)]%, wherein Ls represents the stretched length of the specimen; Lr represents the recovered length of the specimen, Lo represents the original length of the specimen ;
- the spunbonded nonwoven has a RMS recovery, after two successive 50% pulls, of at least 80% ; - the amount of the first polymeric component is at least 50wt% of the total weight of the filament, and the amount of the second polymeric component is less than 50wt% of the total weight of the filament ;
- Another object of the invention is to propose an elastic nonwoven fabric comprising at least one first elastic spunbonded nonwoven layer as defined above, and at least one additional nonwoven layer. More particularly, and optionally, the composite nonwoven is characterized by the following optional features that can be taken alone or combined together:
- the additional nonwoven layer is selected from the group : carded nonwoven ; spunbonded nonwoven, meltblown nonwoven ;
- the additional nonwoven layer can be constituted by a polyolefin- based nonwoven ;
- the elastic nonwoven fabric comprises at least two additional carded nonwoven layers (C) and an elastic spunbonded nonwoven layer (W) of the invention, and sandwiched between the two carded layers; More particularly, the elastic nonwoven fabric can further comprise an additional meltblown layer (M) interposed between the elastic spunbonded nonwoven layer (W) and one carded nonwoven layer (C).
- the layers can be bonded together by one of the following bonding technologies: thermal bonding, water needling, mechanical needling, ultrasonic bonding, air trough bonding and chemical bonding ;
- the layers are perforated.
- the elastic nonwoven fabric has a CD permanent set after two cycles at 150% elongation less 50%, and preferably less than 40%.
- the elastic nonwoven fabric has a CD elongation@Peak of at least 150 %, and preferably of at least 200 %.
- polyolefin-based nonwoven layer means any nonwoven layer that is essentially made from a polymer or copolymer that is exclusively or predominantly made up of polyolefin units.
- at least one polyolefin-based nonwoven layer is a polypropylene-based nonwoven layer.
- polypropylene -based nonwoven layer means any nonwoven layer that is essentially made from a polymer or copolymer that is exclusively or predominantly made up of polypropylene units.
- a further object of the invention is a hydroentangled elastic nonwoven fabric comprising at least one first elastic spunbonded nonwoven layer (W) and at least one second nonwoven layer, and wherein the said first elastic spunbonded nonwoven layer (W) comprises a plurality of multi-component filaments, each multi-component filament comprising a first polymeric component (P) and a second polymeric component (P'), and wherein the first polymeric component (P) comprises an elastic propylene-based olefin copolymer, and the second polymeric component (P') comprises an elastic propylene-based olefin and has a melt flow rate MFR2 that is higher than the melt flow rate MFR1 of the first polymeric component.
- the layers of the hydroentangled elastic nonwoven fabric are perforated, more especially by means of hydro jets.
- - Figure 2 is a schematic drawing of a first example of production line that is used for making a thermo-bonded elastic nonwoven fabric of the invention
- - Figure 3 is a schematic drawing of a second example of production line that is used for making a hydroentangled elastic nonwoven fabric of the invention
- FIG. 4 is a schematic drawing of a third example of production line that is used for making a hydroentangled elastic nonwoven fabric of the invention
- FIG. 5 is a schematic drawing of a fourth example of production line that is used for making a hydroentangled elastic nonwoven fabric of the invention.
- the elastic nonwoven of the invention is obtained by a spunbonding process and is made of multi-component filaments F comprising at least two different polymeric components P 1 P' that are specific of the invention.
- First polymeric component (P) extends along the entire length of each filament in at least a first section of the filament
- a second polymeric component (P') extends along the entire length of each filament in at least a second section of the filament that is distinct from the first section.
- both the first (P) and the second (P') polymeric components comprise an elastic propylene-based olefin copolymer, but have two different melt flow rates (MFR1 ; MFR2), the melt flow rate MFR2 of the second polymeric component being higher than the melt flow rate MFR1 of the first polymeric component.
- the elastic propylene-based olefin copolymers that are suitable for the first and second polymeric components are copolymers comprising propylene and from 10 to 25 weight % of one or more C2 and/or C4 to C10 alpha-olefin co-monomers, like for example the ones commercially available from ExxonMobil Chemical Co, Huston, TX under the trademark of VISTAMAXX®.
- the elastic propylene-based olefin copolymers that are suitable for the first polymeric components are for example a blend of at least two different propylene-ethylene copolymers commercially available from ExxonMobil Chemical Co, Huston, TX under the trademark of
- VISTAMAXX® having two different melt flow rate (MFRIa and MFRIb).
- the first and second polymeric components can also include others materials, like pigments or colorants, or opacizers (like Ti ⁇ 2) antioxidants, stabilizers, fillers, surfactants, waxes, flow promoters or special additives to enhance processability of the composition, like for example slip agents. It is particularly recommended to add slip agents in the second polymeric component.
- filaments F Various shapes in cross section for the filaments F can be envisaged (round shape, oval shape, bilobal shape, trilobal shape, etc.).
- the multi-component filaments are bi-component filaments.
- Some non-limiting examples of different cross sections for bicomponent filaments that are suitable for the invention are illustrated on figures 1 A, 1 B, 1C, 1D, 1E, 1 F.
- Bicomponent filament of the sheath/core type like the ones illustrated in figures 1A, 1B, 1C, 1D, and wherein the core is made of the first polymeric component P and the sheath is made of the second polymeric component P are preferably used for a better thermal-bondability of the elastic spunbonded web with other polyolefin layers, as described hereafter.
- the sheath/core configuration is preferred, the invention is however not limited to that particular configuration. In other variant of the invention, the filaments can however comprise more than two polymeric components.
- the method applied to produce the elastic nonwoven web according to the present invention is the spunbonding process.
- spunbonding processes are described in US patent 3,338,992 to Kenney, US patent 3,692,613 to Dorschner, US patent 3,802, 817 to Matsuki, US patent 4,405,297 to Appel, US patent 4,812,112 to Balk and US patent 5,665,300 to Brignola et al.
- the process line comprises: - a spunbonding unit (SU) for producing an elastic spunbonded nonwoven W made of bi-components filaments, preferably of the sheath/core type ;
- SU spunbonding unit
- a first delivering mean 11 in the form of a roll, for delivering a first additional nonwoven layer L1 , upstream the area where the spunbonded nonwoven W is being formed ;
- the spunbonding unit (SU) comprises two hoppers 1 and 2, containing respectively the first polymeric component (P) and the second (P') polymeric components. These two hoppers 1 and 2 feed in parallel two extruders 3 and 4, for separately melting the two polymeric components. The outputs of the two extruders 3 and 4 are connected to two melt polymer pumps 5, 6 respectively. Said pumps 5, 6 feed a dosed amount of polymers to the bi- component spinning pack 7.
- the bi-component spinning pack 7 usually contains a certain number of plates stacked one on top of the other to distribute the polymers to the lower plate which is the spinnerets plate, having one or more rows of capillary holes and where the bi-component filaments are extruded.
- Typical spinnerets die systems well known designed for polypropylene can be used, for example with a die hole density of 2000-6000 holes per meter, and a die capillary hole diameter of 0.3 to 0.8 mm.
- the barrel temperatures of the two extruders are, for example, ranging from a minimum of 170 0 C to a maximum 260 0 C, depending on screws speed and design.
- Each quench box 8 is connected to a blower which delivers the right low pressure air flow necessary for the filaments cooling.
- the filament curtain After having been cooled the filament curtain enters in a draw unit 9, which in the most preferred case is constituted by a slot through which the filaments are drawn by means of air flow entering from the sides of the slot and flowing downward through the passage.
- the filaments are laid onto a foraminous transport belt (for example a wire belt) forming a transport surface T.
- a vacuum box 12 is positioned below the transport surface T, and delimitates a web forming area on the transport surface T.
- the spunbonding unit (SU) further comprises a compression roller 10 which stabilizes, by means of a low compression, the web W just after it is formed and a pair of thermal point calander rolls 13 (one heated engraved roll and one heated smooth roll), that can be used to bond the layers (L1, W and L2) together.
- Delivering means 11. 15 The first delivering mean 11 is used for laying directly onto the transport surface T, and upstream the web formation area of the spunbonding unit (SU), a bottom pre-consolidated nonwoven layer L1 (for example a spun layer, a meltblown layer or a carder layer). In this configuration, the elastic spunbonded layer W of the invention is formed on top of this bottom layer L1.
- the second delivering mean 15 is used for laying directly onto the spunbonded web W a top pre-consolidated nonwoven layer L2 (for example a spun layer, a meltblown layer or a carder layer).
- the nonwoven layer W is thus sandwiched between the two outer nonwoven layers L1 and L2.
- the elastic spunbonded layer W of the invention can be manufactured off line and wound up in the form of a roll, and the final elastic nonwoven fabric (L1/W/L2) can be manufactured from a roll of said elastic nonwoven W.
- the three layers (L1, W and L2) can be thermo- bonded together by means of calander rolls 13, and the elastic nonwoven fabric (L1/W/L2) is wound up in the form of rolls on a winding machine 14.
- This winding machine 14 has to be suitable for elastic material, and preferably enables a strict control of tension variations during winding, said tension variations being caused by the elastic properties of the final composite nonwoven.
- the invention is not limited to an elastic composite nonwoven fabric that is consolidated by thermal bonding, but within the scope of the invention the elastic fabric can be consolidated by using any bonding technology known in the field of nonwoven, and including notably: water needling (also called hydroentanglement) by means of hydro jets (on one side or on both sides of the composite nonwoven), mechanical needling, ultrasonic bonding, air trough bonding and chemical bonding.
- any bonding technology known in the field of nonwoven, and including notably: water needling (also called hydroentanglement) by means of hydro jets (on one side or on both sides of the composite nonwoven), mechanical needling, ultrasonic bonding, air trough bonding and chemical bonding.
- the elastic composite nonwoven fabric of the invention can be also perforated by using any perforation technology that is known in the field of nonwoven, including notably mechanical perforation and perforation by means of hyd ro jets.
- the process line comprises a carding unit 18, a first spunbonding unit SU, second spunbonding unit 19, a hydraulic needling unit 20, a dewatering unit 21 , a drying unit 22, and a winding unit 23.
- the carded nonwoven layer C is compressed by compaction rolls
- the spunbonding unit SU is similar to the one of figure 2 and is used for producing in line the elastic spunbonded nonwoven layer W of the fabric.
- the spunbonding unit 19 is similar to spunbonding unit (SU), but in contrast with spunbonding unit SU 1 spunbonding unit 19 does not comprise any calender rolls. This spunbonding unit 19 is used for laying a top spunbonded layer S onto the elastic spunbonded layer W.
- the composite nonwoven (C ⁇ //S) is transported, downstream the spunbonding unit 19, by means of a conveyor belt 200 through the hydraulic needling unit 20.
- This hydraulic needling unit 20 is used for bonding together the layers of the nonwoven composite (C ⁇ //S), by means of high pressure water jets (hydroentanglement process) that are directed at least towards the surface of the top layer S, and that penetrate through the structure of the composite and are partially reflected back to the structure.
- the water needling process is performed on both sides of the composite nonwoven (C/W/S).
- the hydraulic needling unit 20 comprises four successive perforated drums.
- First perforated drum 201 is associated with two successive hydro-jet beams 201a and 201b.
- Second perforated drum 202 is associated with two successive hydro-jet beams 202a and 202b.
- Third perforated drum 203 is associated with two successive hydro-jet beams 203a and 203b.
- Fourth perforated drum 204 is associated with two successive hydro-jet beams 204a and 204b.
- the water pressure of the upstream hydro-jet beam 201a is lower than the water pressure of all the other downstream hydro-jet beams 201b, 202a, 202b, 203a, 203b, 204a, 204b, in order to obtain a pre-hydroentanglement of the layers.
- the fourth drum 204 can be equipped with a perforation screen, in order to create apertures in the multilayer elastic fabric C/W/S.
- This perforation step can be also performed by replacing the fourth drum 204 by a suitable drum for perforation, having the surface constituted by one net or several nets superposed one on the other.
- the hydroentangled elastic composite C/W/S is transported downstream the hydraulic needling unit 20 by the conveyor belt 210 of a dewatering unit 21 , and over a vacuum box 211, that enables to remove by suction from the fabric most of the water that has been absorbed during the water needling process (conventional dewatering process).
- the hydroentanglement unit 20 and the dewatering unit 21 can be integrated in the same industrial equipment.
- the dewatered hydroentangled elastic fabric (C/W/S) issued from the dewatering unit 21 is continuously fed through the oven of the drying unit 22, wherein heat is applied to the fabric (for example by means of hot air), in order to remove the remaining water still contained within the fabric.
- the dried fabric (C/W/S) is wound in the form of a roll, by means of the winding unit 23.
- FIG. 4 Another example of a suitable process line for producing a hydroentangled elastic nonwoven fabric of the invention is illustrated in Figure 4.
- the process line of figure 4 differs from the process line of figure 3 by the use of a second carding unit 18' (similar to first carding unit 18), that is substituted to the spunbonding unit 19.
- FIG. 5 Another example of a suitable process line for producing a hydroentangled elastic nonwoven fabric of the invention is illustrated in Figure 5.
- the process line of figure 5 differs from the process line of figure 4 by the use of an additional meltblown unit 24, that is positioned between the first spunbonding unit SU and the second carding unit 18'.
- This meltblown unit 24 is used for producing a meltblown layer M , sandwiched between the elastic spunbonded layer W issued from the first spunbonding unit SU and the carded layer C issued from the second carding unit 18'.
- meltblown layer means any layer essentially made of “meltblown fibers”.
- meltblown fibers are well known in the prior art and a meltblown process for making meltblown fibers is disclosed, for example, in U.S. Pat. No. 3,849,241 to Butin.
- Meltblown fibers are generally formed by extruding a molten thermoplastic material through a plurality of fine, usually circular, die capillaries. The molten threads or filaments issued from the die capillaries are fed into converging high velocity air streams which attenuate the filaments of molten thermoplastic material and reduce their diameter. Said diameter is generally reduced in order to obtain microfibers. Meltblown fibers are thus microfibers that may be continuous or discontinuous, and are generally smaller than 10 microns in diameter. Thereafter, the meltblown fibers are carried by the high velocity air stream and are deposited onto a collecting surface (i.e. the elastic spunbonded nonwoven of the invention) to form a layer of randomly distributed meltblown fibers.
- a collecting surface i.e. the elastic spunbonded nonwoven of the invention
- an additional meltblown layer M is advantageously used when opacity for the elastic nonwoven fabric is required.
- a meltblown layer is preferably laid on top of the elastic spunbonded layer W of the invention ; for example, the weight of the meltblown layer M is at least 5 gsm, preferably 8 gsm and more preferably 10 gsm.
- This meltblown layer gives a more uniform white colour to the elastic nonwoven fabric , and thus improves the aesthetic thereof.
- the spunbonded nonwoven (W) was made from bi- component filaments having a sheath/core arrangement and having the round cross section of figure 1D 1 .
- VM2125 polymer P a
- VM6100 polymer P b
- first polymeric component P
- VM 2125 VM 2125 is a specialty polyolefin elastomer commercially available from ExxonMobil Chemical Co, Huston, TX under the trademark of VISTAMAXX®.
- This specialty polyolefin elastomer is a semi-crystalline elastic propylene-based olefin copolymer comprising at least 85wt% of propylene units and made in the presence of a metallocene catalyst during the polymerization process.
- This copolymer has a melt flow rate (MFRIa) of 80 g/10min (measured at 230 0 C and 2.16Kg - ASTM D-1238), a broad melting temperature range and a highest melting peak of 160 0 C.
- MFRIa melt flow rate
- This copolymer has a slower crystallization rate than polypropylene homopolymers.
- VM6100 VMX6102
- VM 6100 is a specialty polyolefin elastomer commercially available from ExxonMobil Chemical Co, Huston, TX under the trademark of VISTAMAXX®.
- This specialty polyolefin elastomer is a semi-crystalline elastic propylene-based olefin copolymer comprising at least 80wt% of propylene units and made in the presence of a metallocene catalyst during the polymerization process.
- This copolymer has a low melt flow rate (MFRIb) of 3 g/10min (measured at 230 0 C and 2.16Kg - ASTM D-1238), a broad melting temperature range and a highest melting peak of 160 0 C.
- This copolymer has a slower crystallization rate than polypropylene homopolymers.
- VMX 6100 can be replaced by the equivalent grade VM 6102, having same chemical properties as VM 6100 and giving the same elastic properties to the nonwovens produced.
- melt low rate (MFR1) of the first polymeric component (P) was calculated by means of the following equation:
- MFRIb 3 g/10min for VM6100 orVM6102)
- the weight ratio (Wa) of VM2125 was 0.8 and the weight ratio (Wb) of VM6100 (or VM6102) was 0.2.
- the melt flow rate MFR1 of the blend (first polymeric component P) calculated by means of above formula (1) was thus around 41 g/10min.
- the second polymeric component was made of aforesaid elastic propylene-based olefin copolymer VM2115 Other technical characteristics of materials VM6100 (VM6102) and
- VM 2125 are given in table 1. TABLE 1 : VM 6100- VM 6102- VM 2125 - VM 2320
- compositions of the filaments of the different samples of spunbonded nonwoven W are summarized in table 2.
- the additive in the sheath is a slip agent masterbatch containing lubricant and used for facilitating spinning.
- Web samples of a predetermined length Lo in the relaxed state were cut in each web W.
- the web samples were elongated at 50% elongation, held in the stretched state for 30 seconds and then relaxed to zero tensile force.
- the web samples were elongated a second time at 50% elongation, held in the stretched state for 30 seconds and then relaxed to zero tensile force. At the end the recovery (R) was measured.
- the resulting nonwoven of the invention has a root mean square (RMS) average recovery of at least 85%, said RMS average recovery being based on machine direction (RMD) and cross direction (RCD) recovery values after 50% elongation and one pull.
- RMS average recovery are calculated from the formula:
- RMS average recovery [1 /2(R C D 2 + RMD 2 )] m wherein RCD is the recovery measured in the cross direction and R M D is the recovery measured in the machine direction.
- the fabrics have at least about a RMS recovery of 80% after two successive 50% pulls.
- the recovery results issued from these experiments are summarized in Table 4 (elastic spunbonded nonwoven W of the invention).
- Table 5 relates to recovery results obtained with comparative spunbonded webs W not covered by the invention.
- the main characteristics of the TPL) materials used in the comparative examples of table 5 are also summarized in table 6.
- TABLE 4 Elastic spunbonded nonwoven (W) of the invention
- the spunbonded layer (W) of the invention exhibits very high recovery values. These recovery values are higher than recovery values that are obtained for example with spunbonded web made of Sheath/Core bi-component filaments (LLDPE /TPU) as the ones described in examples No 10 of US patent 6,225,243.
- LLDPE /TPU Sheath/Core bi-component filaments
- the comparative examples n°19, 20 and 21 were based on pure TPU, same in core and in sheath arrangement. Even though elasticity was good, the elastic TPU layer exhibits a high stickiness. Furthermore, the elastic TPU layer was not thermo-bondable to other polypropylene-based layers. In addition, because of the degradation of the TPU during melting, TPU materials can not be processed in standard polypropylene extruders. Compared to examples 19 to 21 (TPU/TPU), the elastic spunbonded layer of the invention (samples E-7-6; E-7-8; E-7-10) is advantageously less sticky, and thus easier to be wound and unwound. Furthermore, the chemical composition of the sheath is similar to polyolefin materials that are mostly used in the field of nonwoven.
- the polymeric materials used for practicing the invention can thus be advantageously processed in standard polypropylene extruders. Furthermore, thermal bondability of the spunbonded layers (W) of the invention with other polyolefin-based nonwoven layers (L1 , L2) is improved.
- the comparative examples N° 22 and N°23 were based on pure VM2125 or VM 2120. Compared to examples N°22 and N°23 (VM ⁇ /M), the spunbonded layers (W) of the invention (E-7-6; E-7-8; E-7-10) have advantageously a higher elasticity and elastic recovery.
- the spunbonded nonwoven layer W of the invention does not necessarily require any activation step for obtaining its elastic properties.
- C carded layer W: Elastic spunbonded layer of the invention
- S Spunbonded layer PP : Polypropylene
- the outer carded layers (C) with low basis weight give textile appearance and soft touch to the final nonwoven fabric. This property is particularly useful in all applications wherein the composite nonwoven has to come into contact with the skin, for example in diapers, feminine/adult care or the like.
- the outer polypropylene carded layers (C) also give advantageously a dimensional stabilization to the nonwoven fabric in the machine direction.
- Example - Non-perforated hvdroentangled elastic nonwoven fabrics A non perforated composite nonwoven fabric (C/W/M/C) of basis weight 92gsm has been also produced in a pilot plant according to the manufacturing process of figure 5 (example referred "E-105/HET").
- the two external layers were carded layers (C) made of PP (polypropylene fibers).
- the basis weight of each carded layer (at the output of the carded unit) was 14gsm.
- the elastic spunbonded layer W was made of bicomponent sheath/core filaments having the round cross-section of figure 1D.
- the core of the filaments was made (first polymeric component P) of a blend VM2125 (70wt% ) and VM6100 (30wt%).
- the melt flow rate MFR1 of this blend (first polymeric component P) calculated by means of formula (1) was thus around 29.87g/10min.
- the outer sheath of the filaments was made of VM 2125 (second polymeric component P').
- the weight of the core was 90% of the total basis weight, and the weight of the sheath was 10% of the total basis weight.
- the basis weight of the elastic spunbonded layer (W) was 54gsm.
- the material used for the elastic meltblown layer (M) was VM 2320.
- the basis weight of the meltblown layer (M) was 10gsm.
- VM 2320 is a specialty polyolefin elastomer suitable for melt blown process commercially available from ExxonMobil Chemical Co, Huston, TX under the trademark of VISTAMAXX®.
- This specialty polyolefin elastomer is a semi-crystalline elastic propylene-based olefin copolymer comprising at least 80wt% of propylene units and made in the presence of a metallocene catalyst during the polymerization process.
- This copolymer has a MFR (Melt Flow Rate) of 200 (measured at 230 0 C and 2.16Kg - ASTM D-1238), a broad melting temperature range and a highest melting peak of 160 0 C.
- This copolymer has a slower crystallization rate than polypropylene homopolymers.
- thermoplastic materials VM 2320 are given in table ! More generally, the thermoplastic materials used for making the meltblown fibers will be knowingly selected by one skilled in the art, in respect of the properties required for the elastic nonwoven fabric.
- Specialty elastomeric polyolefin VM2320 is given only by way of example. This specialty elastomeric polyolefin can be replaced by any other known thermoplastic material, in particular by any thermoplastic material that are used in the field of hygienic product (diapers, training pants, ..) for making meltblown layers.
- Elastic properties of these elastic nonwoven fabrics of the invention were measured at 23°C ⁇ 2, using an lnstron Testing apparatus equipped with Grips type line contact or similar.
- the grip defines the gauge for the specimen, therefore those skilled in the art know that the grip must hold the specimen to avoid slipping or damage.
- the above mentioned apparatus has to be set at 1 inch gauge length and a stretching rate of 10 inches per minute.
- the specimens will have the following dimensions: width 1 inch and length 3 inches.
- the forces were measured in Newton/inch.
- Tensile tests, load at peak and elongation at peak and hysteresis cycles have been performed on the above mentioned specimens specifically in cross direction (CD).
- the lnstron Testing apparatus is equipped with a software which plots the load-elongation curve and the data are stored in the buffer memory.
- CD Load@peak From the load-elongation curve of the same specimen used during the previous test measurement we obtain the corresponding value of the CD Elongation@peak expressed in %.
- CD Load@150%Elonqation From the load-elongation curve of the same specimen used during the first test measurement we obtain the corresponding value of the CD Load@150 %Elongation, expressed in N/inch.
- CD Permanent Set after 2 Cvcles(S)150% Elongation A new specimen has been pulled (1 st cycle) at a stretching rate of 10 inches per minute till the designated 150% elongation value: the sample is then held in the stretched state for 30 seconds and allowed to fully relax at zero force for 60 seconds. A second pull is applied (2 nd cycle) at a stretching rate of 10 inches per minute till the designated 150% elongation value, held in the stretched state for 30 seconds and then allowed to fully relax at zero force.
- ELASTIC layer % represent the weight percentage of the elastic material [i.e. elastic spunbonded layer (W) and elastic meltblown layer for example E-105/HET and elastic spunbonded layer (W) for examples E-150-FP, E-151-FP, E-152-FP, E-153-FP, E-155- FP] on the total weight of the elastic nonwoven fabric.
- Example-elastic spunbonded nonwoven (VWM) Samples of multilayer nonwoven (C/W/M/C) have been produced on a pilot plant, without bonding the layers together. Then the two outer carded layers were removed in order to keep only the elastic spunbonded (W) and meltblown (M) layers.
- the elastic spunbonded layer W was made of bicomponent sheath/core filaments having the round cross-section of figure 1D.
- the core of the filaments was made (first polymeric component P) of a blend VM2125 (70wt% ) and VM6100 (30wt%).
- the outer sheath of the filaments was made of VM 2125 (second polymeric component P').
- the weight of the core was 90% of the total basis weight, and the weight of the sheath was 10% of the total basis weight.
- the basis weight of the elastic spunbonded layer (W) was 54gsm.
- the material used for the elastic meltblown layer (M) was VM 2320.
- the basis weight of the meltblown layer (M) was 10gsm.
- the elastic nonwoven fabric of the invention is not limited to the particular multilayered structures of the examples previously described.
- the invention actually encompasses any elastic nonwoven fabric wherein at least one of the layer is an elastic spunbonded nonwoven W as the one defined in the claims.
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Abstract
Description
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EP08785501.1A EP2094891B1 (en) | 2007-09-10 | 2008-08-12 | Elastic spunbonded nonwoven and elastic nonwoven fabric comprising the same |
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EP20070017656 EP2034057A1 (en) | 2007-09-10 | 2007-09-10 | Elastic spunbonded nonwoven and elastic nonwoven fabric comprising the same |
EP08785501.1A EP2094891B1 (en) | 2007-09-10 | 2008-08-12 | Elastic spunbonded nonwoven and elastic nonwoven fabric comprising the same |
PCT/EP2008/006622 WO2009033540A2 (en) | 2007-09-10 | 2008-08-12 | Elastic spunbonded nonwoven and elastic nonwoven fabric comprising the same |
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EP20070017656 Withdrawn EP2034057A1 (en) | 2007-09-10 | 2007-09-10 | Elastic spunbonded nonwoven and elastic nonwoven fabric comprising the same |
EP08785501.1A Active EP2094891B1 (en) | 2007-09-10 | 2008-08-12 | Elastic spunbonded nonwoven and elastic nonwoven fabric comprising the same |
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US (1) | US20090068912A1 (en) |
EP (2) | EP2034057A1 (en) |
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US20100029164A1 (en) | 2008-08-04 | 2010-02-04 | Sudhin Datta | Soft Polypropylene-Based Nonwovens |
US9018112B2 (en) * | 2003-11-18 | 2015-04-28 | Exxonmobil Chemicals Patents Inc. | Extensible polypropylene-based nonwovens |
US8007699B2 (en) * | 2008-08-20 | 2011-08-30 | Fina Technology, Inc. | Process of making bicomponent fiber |
CN104894666A (en) * | 2009-12-23 | 2015-09-09 | 英威达技术有限公司 | Elastic fiber containing antisticking additive |
TWI649468B (en) * | 2010-05-26 | 2019-02-01 | 伊唯斯科技公司 | Bicomponent spandex with reduced friction |
CN104661627B (en) | 2012-09-21 | 2018-11-02 | 宝洁公司 | Product with soft non-woven layer |
US20140127461A1 (en) * | 2012-11-06 | 2014-05-08 | The Procter & Gamble Company | Article(s) with soft nonwoven web |
US20140127459A1 (en) * | 2012-11-06 | 2014-05-08 | The Procter & Gamble Company | Article(s) with soft nonwoven web |
US20140127460A1 (en) * | 2012-11-06 | 2014-05-08 | The Procter & Gamble Company | Article(s) with soft nonwoven web |
JP6188306B2 (en) * | 2012-11-08 | 2017-08-30 | スリーエム イノベイティブ プロパティズ カンパニー | Nonwoven fabric and stretchable laminate |
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- 2008-08-12 CA CA2697552A patent/CA2697552C/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
EP2034057A1 (en) | 2009-03-11 |
WO2009033540A3 (en) | 2009-05-28 |
US20090068912A1 (en) | 2009-03-12 |
EP2094891B1 (en) | 2018-03-07 |
CA2697552C (en) | 2015-10-06 |
WO2009033540A2 (en) | 2009-03-19 |
CA2697552A1 (en) | 2009-03-19 |
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