US4804577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt blown nonwoven web from fiber comprising an elastomer
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1987-01-27
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Granted: 1989-02-14
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Expires: 2007-01-27
Abstract
Abstract A nonwoven web is prepared from a polymeric blend comprising at least one elastomer and at least one thermoplastic resin. The nonwoven web comprises fibers produced by melt blowing the polymeric blend. Conventional techniques are used to accomplish the melt blowing but due to high viscosity of certain elastomers it is frequently necessary to degrade the polymer blend prior to melt blowing. The nonwoven web exhibits improved extensibility, texture and hand.
Inventors
- 👤 Donald R. Hazelton
- 👤 William J. Hodgson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:32
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/06; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/56; D04H1/70; D04H1/72; D04H1/724; D04H3/00; D04H3/005; D04H3/007; D04H3/08; D04H3/16; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/614; Y10T442/626; Y10T442/637
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
89 words
A soft, elastic, melt blown non-woven web comprising random, discontinuous fibers having a diameter within the range of 0.5 to 5 microns and being bound together by entanglement, said fibers being composed of a polymer blend of (a) from 15 wt% to 50 wt% of an elastomeric copolymer of an isoolefin and a conjugated diolefin and (b) from 85 wt% to 50 wt% of a thermoplastic olefin polymer resin, wherein said polymer blend has been thermally or oxidatively degraded to reduce substantially the intrinsic viscosity of the polymer blend.
Claim 2
Dependent Claim
89 words
A soft, elastic, melt blown non-woven web comprising random, discontinuous fibers having a diameter within the range of 0.5 to 5 microns and being bound together by entanglement, said fibers being composed of a polymer blend of (a) from 15 wt% to 50 wt% of an elastomeric copolymer of an isoolefin and a conjugated diolefin and (b) from 85 wt% to 50 wt% of a thermoplastic olefin polymer resin, wherein said polymer blend has been thermally or oxidatively degraded to reduce substantially the intrinsic viscosity of the polymer blend.
Claim 3
Dependent Claim
23 words
The melt blown nonwoven web of claim 1 wherein the degraded polymer blend has an intrinsic viscosity of 0.6 to less than 1.4.
Claim 4
Dependent Claim
20 words
The nonwoven web of claim 1 wherein said elastomeric polymer comprises not more than 30 wt% of said conjugated diolefin.
Claim 5
Dependent Claim
32 words
The nonwoven web of claim 3 wherein said elastomeric polymer contains from about 85 to about 99.5 wt% of said isoolefin and from about 0.5 to about 5 wt% of said diolefin.
Claim 6
Dependent Claim
16 words
The nonwoven web of claim 4 wherein said isoolefin is isobutylene and said diolefin is isoprene.
Claim 7
Dependent Claim
14 words
The nonwoven web of claim 1 wherein said thermoplastic olefin polymer resin is polypropylene.
Claim 8
Dependent Claim
31 words
The nonwoven web of claim 1 wherein said thermoplastic olefin polymer resin is a copolymer of ethylene and an unsaturated ester of a lower carboxylic acid or a lower carboxylic acid.
Claim 9
Dependent Claim
20 words
The nonwoven web of claim 7 wherein said thermoplastic olefin polymer resin is a copolymer of ethylene and vinyl acetate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |