US5079080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming a superabsorbent composite web from fiberforming thermoplastic polymer and supersorbing polymer and products produced thereby
Assignee: Bix Fiberfilm Corp
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Filing: 1989-05-26
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Granted: 1992-01-07
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Expires: 2009-05-26
Abstract
Abstract There is disclosed a novel process to form a water-absorbing sheet by extruding an aqueous solution of superabsorbing polymer as a fibrous stream onto a high velocity, hot fibrous stream of melt-blown fibers of thermoplastic polymer, causing entanglement of the fiber and forming a superabsorbent non-woven mat free of dusting problems.
Inventors
- 👤 Eckhard C. A. Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:09
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/02; D04H3/03; D04H1/00; D04H1/40; D04H1/54; D04H1/56; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/609; Y10T442/68
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
31 words
The sorbent sheet product comprising a mixture of entangled melt-blown fibers and high-sorbency, water-insoluble fibers uniformly dispersed within each other, said sorbent fibers being selected from acrylic polymers having hydrophilic functionality.
Claim 2
Dependent Claim
31 words
The sorbent sheet product comprising a mixture of entangled melt-blown fibers and high-sorbency, water-insoluble fibers uniformly dispersed within each other, said sorbent fibers being selected from acrylic polymers having hydrophilic functionality.
Claim 3
Dependent Claim
21 words
The sorbent sheet product as defined in claim 1 wherein said melt-blown fibers are selected from polypropylene, polyethylene, polyester and polyamides.
Claim 4
Dependent Claim
23 words
The sorbent sheet product as defined in claim 1 wherein the sorbent fibers comprise at least 10 percent by weight of said sheet.
Claim 5
Dependent Claim
23 words
The sorbent sheet product as defined in claim 2 wherein the sorbent fibers comprise at least 10 percent by weight of said sheet.
Claim 6
Dependent Claim
22 words
The sorbent sheet product as defined in claim 1 wherein the diameter of the fibers is less than 15 micrometers in average.
Claim 7
Dependent Claim
22 words
The sorbent sheet product as defined in claim 2 wherein the diameter of the fibers is less than 15 micrometers in average.
Claim 8
Dependent Claim
22 words
The sorbent sheet product as defined in claim 3 wherein the diameter of the fibers is less than 15 micrometers in average.
Claim 9
Dependent Claim
18 words
The sorbent sheet product as defined in claim 1 wherein said water-insoluble fibers are essentially continuous in length.
Claim 10
Dependent Claim
18 words
The sorbent sheet product as defined in claim 1 wherein said melt-blown fibers are essentially continuous in length.
Claim 11
Dependent Claim
22 words
The sorbent sheet product as defined in claim 1 wherein said melt-blown fibers and said water-insoluble fibers are essentially continuous in length.
References Cited (Backward Citations)
US4380570A
Cited
US4803117A
Cited
US4741949A
Cited
US4923742A
Cited
US4820577A
Cited
US4828911A
Cited
US4847141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |