EP0279511A2
Expired / Lapsed
EP
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Thermally bonded nonwoven fabric
Assignee: Daiwa Boseki KK
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Filing: 1988-01-15
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Granted: —
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Expires: 2008-01-15
Abstract
Abstract There is provided a thermally bonded nonwoven fabric with a unit weight of 10 to 40 g/m², comprising 20 to 100% by weight of a composite fiber with a fineness of 0.5 to 8 denier and 80 to 0% by weight of other fibers as the constituent fibers, the composite fiber comprising a first component which is an ethylene-α-olefin copolymer composition comprising an ethylen-α-olefin copolymer containing 0.5 to 4% by weight of an α-olefin having 4 to 12 carbon atoms blended with 0.01 to 0.3% by weight of a phenol type antioxidant and 0.01 to 0.3% by weight of a sulfur type antioxidant, having a Q-value (weight average molecular weight/number average molecular weight) of 4 or less, a density of 0.930 to 0.950 g/cm³, a melt flow rate of 5 to 50 g/10 min. and an oxidation induction time at 210°C of 10 min. or longer, and a second component which is a thermoplastic resin having a melting point higher by at least 20°C than that of the first component, with a constitutional ratio (sectional area ratio) of the first component to the second component being 35:65 to 70:30, said first component of the composite fiber forming at least a proportion of the fiber surface continuously along the length of each fiber and adhering through melting mutually the constituent fibers.
Inventors
- 👤 Akihiko Mitsubishi Petrochemical Co Ltd Uchikawa
- 👤 Koji C/O Mitsubishi Petrochemical Co Ltd Nishida
- 👤 Yasuji C/O Mitsubishi Petrochemical Co Ltd Hosono
- 👤 Kazuhisa C/O Mitsubishi Petrochemical Co Ltd Tachi
- 👤 Takesi C/O Mitsubishi Petrochemical Co Ltd Okamoto
- 👤 Yosuke Takai
- 👤 Hideo Nakashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 01:32
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/637; Y10T442/68
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
216 words
A thermally bonded nonwoven fabric with a unit weight of 10 to 40 g/m², comprising 20 to 100% by weight of a composite fiber with a fineness of 0.5 to 8 denier and 80 to 0% by weight of other fibers as the constituent fibers, the composite fiber comprising a first component which is an ethylene-α-olefin copolymer composition comprising an ethylene-α-olefin copolymer containing 0.5 to 4% by weight of an α-olefin having 4 to 12 carbon atoms blended with 0.01 to 0.3% by weight of a phenol type antioxidant and 0.01 to 0.3% by weight of a sulfur type antioxidant, having a Q-value (weight average molecular weight/number average molecular weight of 4 or less, a density of 0.930 to 0.950 g/cm³, a melt flow rate of 5 to 50 g/10 min. and an oxidation induction time at 210°C of 10 min. or longer, and a second component which is a thermoplastic resin having a melting point higher by at least 20°C than that of the first component, with a constitutional ratio (sectional area ratio) of the first component to the second component being 35:65 to 70:30, said first component of the composite fiber forming at least a proportion of the fiber surface continuously along the length of each fiber and,adhering through melting mutually the constituent fibers.
Claim 2
Dependent Claim
216 words
A thermally bonded nonwoven fabric with a unit weight of 10 to 40 g/m², comprising 20 to 100% by weight of a composite fiber with a fineness of 0.5 to 8 denier and 80 to 0% by weight of other fibers as the constituent fibers, the composite fiber comprising a first component which is an ethylene-α-olefin copolymer composition comprising an ethylene-α-olefin copolymer containing 0.5 to 4% by weight of an α-olefin having 4 to 12 carbon atoms blended with 0.01 to 0.3% by weight of a phenol type antioxidant and 0.01 to 0.3% by weight of a sulfur type antioxidant, having a Q-value (weight average molecular weight/number average molecular weight of 4 or less, a density of 0.930 to 0.950 g/cm³, a melt flow rate of 5 to 50 g/10 min. and an oxidation induction time at 210°C of 10 min. or longer, and a second component which is a thermoplastic resin having a melting point higher by at least 20°C than that of the first component, with a constitutional ratio (sectional area ratio) of the first component to the second component being 35:65 to 70:30, said first component of the composite fiber forming at least a proportion of the fiber surface continuously along the length of each fiber and,adhering through melting mutually the constituent fibers.
Claim 3
Dependent Claim
20 words
The thermally bonded nonwoven fabric according to claim 1, wherein the ethylene-α-olefin has been polymerized using an ionic polymerization catalyst.
Claim 4
Dependent Claim
35 words
The thermally bonded nonwoven fabric according to any of the preceding claims, wherein the α-olefin having 4 to 12 carbon atoms is a member selected from the group consisting of butene-1, hexene-1, 4-methylpentene-1 and octene-1.
Claim 5
Dependent Claim
59 words
The thermally bonded nonwoven fabric according to any of the preceding claims, wherein the α-olefin content in the ethylene-u-olefin copolymer is 1.5 to 4% by weight for 1-olefin having 4 carbon atoms, 0.7 to 3.5% by weight for 1-olefin having 5 to 7 carbon atoms, and 0.5 to 3% by weight for 1-olefin having 8 to 12 carbon atoms.
Claim 6
Dependent Claim
24 words
The thermally bonded nonwoven fabric according to any of the preceding claims, wherein the density of the ethylene-α-olefin copolymer is 0.940 to 0.948 g/cm³.
Claim 7
Dependent Claim
25 words
The thermally bonded nonwoven fabric according to any of the preceding claims, wherein the melt flow rate of the ethylene-α-olefin copolymer is 5 to 30g/10min.
Claim 8
Dependent Claim
48 words
The thermally bonded nonwoven fabric according to any of the preceding claims, wherein the ethylene-α-olefin copolymer contains 8 to 25% by weight of a high molecular weight component of 5×10⁴ or more, which high molecular weight component contains 10 to 35% by weight of a low crystalline component.
Claim 9
Dependent Claim
29 words
The thermally bonded nonwoven fabric according to any of the preceding claims, wherein the phenol type antioxidant is a compound selected from the group consisting of tetrakis[methylene-(3,5-di-t-butyl-4-hydroxyl)propionate]methane, tris(3,5-di-t-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris(4-t-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate.
Claim 10
Dependent Claim
31 words
The thermally bonded nonwoven fabric according to any of the preceding claims, wherein the sulfur type antioxidant is a compound selected from the group consisting of di-myristyl-3,3ʹ-thio-di-propionate, di-lauryl-3,3ʹ-thio-di-propionate, di-stearyl-3,3ʹ-thio-di-propionate, lauryl-stearyl-3,3ʹ-thio-di-propionate, penta-erytrid-tetra(β-lauryl-thiopropionate).
Claim 11
Dependent Claim
40 words
The thermally bonded nonwoven fabric according to any of the preceding claims, wherein the thermoplastic resin used as the second component of the composite fiber is a resin selected from the group consisting of a propylene polymer, polyamide and polyester.
Claim 12
Dependent Claim
38 words
The thermally bonded nonwoven fabric according to claim 10, wherein the propylene polymer is an isotactic polypropylene, propylene-ethylene block copolymer or propylene-ethylene random copolymer, the polyamide is 6-nylon, 66-nylon or 11-nylon, and the polyester is polyethyleneterephthalate or polytetramethyleneterephthalate.
Claim 13
Dependent Claim
25 words
The thermally bonded nonwoven fabric according to claim 10, wherein the thermoplastic resin is a propylene polymer having melt flow rate of 5 to 500g/10min.
Claim 14
Dependent Claim
24 words
The thermally bonded nonwoven fabric according to any of the preceding claims, wherein the thermoplastic resin has a melting point of 150°C or higher.
Claim 15
Dependent Claim
23 words
The thermally bonded nonwoven fabric according to any of the preceding claims, wherein said other fibers have fineness of 10 denier or lower.
Claim 16
Dependent Claim
38 words
The thermally fused nonwoven fabric according to any of the preceding claims, wherein said other fibers are selected from the group consisting of cotton fibers, viscose rayon fibers, polyester fibers, polypropylene fibers, acrylic fibers and the mixtures thereof.
References Cited (Backward Citations)
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