US4256111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filaments of chemically modified cellulose fibers and webs and products formed therefrom
Assignee: Kimberly Clark Worldwide Inc
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Filing: 1973-10-01
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Granted: 1981-03-17
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Expires: 1993-10-01
Abstract
Abstract Chemically modified cellulose fibers such as those which have been subjected to phosphorylation or carboxymethylation or to polymer grafting-hydrolysis are refined in the presence of water, centrifuged to remove unbound water and extruded into filaments. The individual fibers are identifiable within the filaments and are generally aligned parallel to the filament axis. Certain embodiments of the filaments are highly absorbent, have fast wicking rates, and may be self-bonded to form integral nonwoven webs for use in disposable diapers, sanitary products, wipers and the like.
Inventors
- 👤 Frederick O. Lassen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:49
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/534; A61F13/537; A61F13/53708; A61F13/53717; A61F13/15203; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; C; C08; C08B; C08B5/00; A61F13/20; A61F13/2002; A61F13/202; A61F13/2051; A61F2013/15008; A61F2013/15048; A61F2013/530007; A61F2013/530036; A61F2013/530131; A61F2013/530481; A61F2013/530583; A61F2013/530613; A61F2013/53062; A61F2013/530795; A61F2013/53445; A61F2013/53721; A61F13/84; A61F2013/8488; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2915; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/159; Y10T442/60; Y10T442/659; Y10T442/668
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
106 words
A highly absorbent, fast wicking filament comprising fibers of a chemically modified cellulose, which has been transformed by derivatization to increase its hydrophilic character, said fibers being selected from the group consisting of, (a) cellulose that has been chemically substituted by etherization or esterification, (b) cellulose that has been chemically substituted by etherization or esterification and cross-linked, and (c) cellulose that has been polymeric grafted, said fibers being generally of papermaking size and having been extruded through an orifice having a diameter of about 0.005 to about 0.060 inch and interbonded so as to be generally aligned and form channels within said filament for transporting liquid.
Claim 2
Dependent Claim
106 words
A highly absorbent, fast wicking filament comprising fibers of a chemically modified cellulose, which has been transformed by derivatization to increase its hydrophilic character, said fibers being selected from the group consisting of, (a) cellulose that has been chemically substituted by etherization or esterification, (b) cellulose that has been chemically substituted by etherization or esterification and cross-linked, and (c) cellulose that has been polymeric grafted, said fibers being generally of papermaking size and having been extruded through an orifice having a diameter of about 0.005 to about 0.060 inch and interbonded so as to be generally aligned and form channels within said filament for transporting liquid.
Claim 3
Dependent Claim
15 words
The filament of claim 1 wherein said chemically modified cellulose fibers comprise phosphorylated wood pulp.
Claim 4
Dependent Claim
15 words
The filament of claim 1 wherein said chemically modified cellulose fibers comprise phosphorylated cotton linters.
Claim 5
Dependent Claim
19 words
The filament of claim 1 wherein said chemically modified cellulose fibers have been produced by chemical substitution and crosslinking.
Claim 6
Dependent Claim
14 words
The filament of claim 4 wherein said chemically modified fibers comprise cross-linked carboxymethyl cellulose.
Claim 7
Dependent Claim
17 words
The filament of claim 1 wherein said chemically modified cellulose fibers have been produced by polymer grafting.
Claim 8
Dependent Claim
16 words
The filament of claim 6 wherein said chemically modified cellulose fibers comprise hydrolyzed acrylonitrile grafted cellulose.
Claim 9
Dependent Claim
36 words
The filament of claim 1 wherein said chemically modified cellulose fibers comprise a blend of fibers selected from the group consisting of chemically substituted cellulose fibers, crosslinked chemically substituted cellulose fibers, and polymer grafted cellulose fibers.
Claim 10
Dependent Claim
8 words
A web comprising interbonded filaments of claim 1.
Claim 11
Dependent Claim
20 words
A disposable diaper including a backing, absorbent material, and liner wherein the absorbent material includes the filaments of claim 1.
Claim 12
Dependent Claim
20 words
A sanitary napkin comprising a liner and an absorbent material wherein the absorbent material includes the filaments of claim 1.
Claim 13
Dependent Claim
12 words
A wipe comprising an absorbent layer including the filaments of claim 1.
Claim 14
Dependent Claim
12 words
A tampon comprising an absorbent material including the filaments of claim 1.
Claim 15
Dependent Claim
13 words
A surgical sponge comprising an absorbent material including the filaments of claim 1.
Claim 16
Dependent Claim
22 words
An absorbent dressing useful as a sanitary protection device including as an essential ingredient a layer comprising the filaments of claim 1.
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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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |