# US 7,405,171 B2 · Elastic nonwoven fabric and fiber products manufactured therefrom

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- Number: US 7,405,171 B2
- Document ID: US7405171B2
- Status: Granted
- Kind: B2
- Application number: 10/635,424
- Filed: 2003-08-05
- Published: 2004-04-08
- Granted: 2008-07-29
- Earliest claimed: 2002-08-08
- Assignees: Chisso Corporation; Chisso Polypro Fiber Company Limited
- Inventors: Yoshimi Tsujiyama; Hisanobu Minamizawa; Junji Iwata
- Web page: https://patentgrep.com/patent/US7405171B2

## CPC

- D04H 3/16: with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
- B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)}
- D04H 1/43835: {Mixed fibres, e.g. at least two chemically different fibres or fibre blends}
- D04H 1/43838: {Ultrafine fibres, e.g. microfibres}
- D04H 3/007: Addition polymers
- D04H 5/06: strengthened or consolidated by welding-together thermoplastic fibres, filaments, or yarns
- Y10T 428/2915: including textile, cloth or fabric
- Y10T 442/2008: Fabric composed of a fiber or strand which is of specific structural definition
- Y10T 442/3707: Woven fabric including a nonwoven fabric layer other than paper
- Y10T 442/494: Including a nonwoven fabric layer other than paper
- Y10T 442/601: Nonwoven fabric has an elastic quality
- Y10T 442/602: Nonwoven fabric comprises an elastic strand or fiber material
- Y10T 442/607: Strand or fiber material is synthetic polymer
- Y10T 442/614: Strand or fiber material specified as having microdimensions [i.e., microfiber]
- Y10T 442/615: Strand or fiber material is blended with another chemically different microfiber in the same layer
- Y10T 442/622: Microfiber is a composite fiber
- Y10T 442/627: Strand or fiber material is specified as non-linear [e.g., crimped, coiled, etc.]
- Y10T 442/638: Side-by-side multicomponent strand or fiber material
- Y10T 442/641: Sheath-core multicomponent strand or fiber material
- Y10T 442/659: Including an additional nonwoven fabric
- Y10T 442/674: Nonwoven fabric with a preformed polymeric film or sheet
- Y10T 442/68: Melt-blown nonwoven fabric
- Y10T 442/681: Spun-bonded nonwoven fabric
- Y10T 442/697: Containing at least two chemically different strand or fiber materials
- D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); 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}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

PROBLEM TO BE SOLVED: To provide an elastic nonwoven fabric with a good elasticity, adequate strength under elongation, good antiblocking property and favorable feeling, suitable for fiber products, at low cost, as well as fiber products using the same. SOLUTION: An elastic nonwoven fabric comprising long elastomeric fiber and nonelastomeric fiber in a weight ratio within a range from 50/50 to 95/5, which has an elongation recovery rate of the elastic nonwoven fabric after 50% elongation equal to or higher than 70%, and a resistance to peel two sheets of the nonwoven fabric apart equal to or lower than the strength of the fabric under 50% elongation; as well as fiber products using the same.

## Claims

### Claim 1

An elastic nonwoven fabric consisting of one layer wherein a long elastomeric fiber and a long nonelastomeric fiber are uniformly mixed together by spinning with a melt-blowing method that uses a spinneret having both a spinning hole for discharging elastomeric resin and another spinning hole for discharging nonelastomeric resin thereon,
wherein a ratio of said long elastomeric fiber to said long nonelastomeric fiber ranges from 50/50 to 95/5 on a weight basis, said long elastomeric fiber has an average diameter (Bd) of 5 to 40 μm, an elongation recovery rate of the elastic nonwoven fabric after 50% elongation is 70% or higher, a separation resistance of two sheets of the same is equal or less than the strength at 50% elongation, and a ratio of Bd to an average diameter (Ad) of said long nonelastomeric fiber is no less than 2.

### Claim 2 (depends on 1)

An elastic nonwoven fabric according to claim 1, wherein the said long elastomeric fiber comprises at least one of the group consisting of elastomeric polystyrenes and elastomeric polyolefins.

### Claim 3 (depends on 1)

An elastic nonwoven fabric according to claim 1, wherein the said long nonelastomeric fiber has an average diameter (Ad) of 1 to 20 μm.

### Claim 4 (depends on 1)

A laminated elastic nonwoven fabric manufactured by laminating at least one item chosen from the group consisting of a nonwoven fabric different from one according to claim 1, film, web, textile, knit and fiber bundle, to an elastic nonwoven fabric according to claim 1.

### Claim 5 (depends on 1)

A fiber product which employs the elastic nonwoven fabric according to claim 1.

### Claim 6 (depends on 4)

A fiber product which employs the laminated elastic nonwoven fabric according to claim 4.