US4179416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alloy rayon fibers having dispersed therein an amide polymer and a polyacrylic acid salt
Assignee: Akzo Nobel UK PLC
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Filing: 1978-02-23
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Granted: 1979-12-18
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Expires: 1998-02-23
Abstract
Abstract Alloy fibers having high fluid-holding capacity, and a method for making the same, the alloy fibers being comprised of a matrix of regenerated cellulose having polyvinylpyrrolidone dispersed therein. The polyvinylpyrrolidone may be present in combination with an anionic polymer.
Inventors
- 👤 Frederick R. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:50
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/44; D01F6/56; A; A61; A61F; A61F13/00; A61F13/15; A61F13/20; A61F13/2082; A61F13/2085; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; C; C08; C08L; C08L1/00; C08L1/02; C08L1/06; D01F1/00; D01F1/02; D01F1/10; D01F2/00; D01F2/06; D01F2/08; D01F2/10; A61F13/2002; A61F13/202; A61F13/53; A61F2013/530131; A61F2013/530481; A61F2013/530489; A61F2013/530496
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
30 words
Alloy rayon fibers of higher fluid-holding capacity than non-alloy rayon, comprising a regenerated cellulose matrix having dispersed therein a polyvinylpyrrolidone polymer and an alkali metal salt of a polyacrylic acid.
Claim 2
Dependent Claim
30 words
Alloy rayon fibers of higher fluid-holding capacity than non-alloy rayon, comprising a regenerated cellulose matrix having dispersed therein a polyvinylpyrrolidone polymer and an alkali metal salt of a polyacrylic acid.
Claim 3
Dependent Claim
43 words
Fibers as in claim 1 comprising a regenerated cellulose matrix having dispersed therein said salt of a polyacrylic acid selected from the group consisting of an alkaline sodium salt of acrylic acid homopolymer, of methacrylic acid homopolymer and of acrylic acid-methacrylic acid copolymers.
Claim 4
Dependent Claim
34 words
Alloy fibers according to claim 1 wherein the added polymers are present in an amount such that the fibers have a fluid-holding capacity of at least 5 cc/gram, as measured by the Snygyna test.
Claim 5
Dependent Claim
35 words
Process of making the fibers of claim 1 wherein a blend of viscose with the polyvinylpyrrolidone and the alkali metal salt of said polyacrylic acid is spun into a coagulating bath to form the fibers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |