US4399255A
Expired / Lapsed
US
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Alloy rayon fibers of regenerated cellulose and copolymeric acrylic acid salts
Assignee: Akzo Nobel UK PLC
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Filing: 1982-09-10
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Granted: 1983-08-16
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Expires: 2002-09-10
Abstract
Abstract Alloy rayon fiber of regenerated cellulose and an at least partially neutralized copolymer of acrylic or methacrylic acid and a comonomer selected from an hydroxyalkyl (C2-C6) ester of such acid or a styrenic monomer. The copolymer is present in an amount effective to increase the fluid holding capacity of the fiber. Masses of the fibers are useful as surgical dressings, tampons and other fluid-absorbing articles.
Inventors
- 👤 Frederick R. Smith
- 👤 Walter W. Toy
- 👤 David Witiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:37
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; C; C08; C08L; C08L1/00; C08L1/08; C08L1/22; C08L1/24
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
83 words
Alloy rayon fiber comprising regenerated cellulose and an at least partially neutralized copolymer of (a) at least one acid monomer selected from acrylic acid and methacrylic acid, and (b) at least one comonomer selected from hvdroxyalkyl C 2 -C 6 ) esters of said acids and a styrenic comonomer, the monomer ratio (a:b) in the copolymer ranging from 95:5 to 50:50 by weight, said copolymer being present in an amount effective to provide a measurable fluid holding capacity increase for the alloy fiber.
Claim 2
Dependent Claim
83 words
Alloy rayon fiber comprising regenerated cellulose and an at least partially neutralized copolymer of (a) at least one acid monomer selected from acrylic acid and methacrylic acid, and (b) at least one comonomer selected from hvdroxyalkyl C 2 -C 6 ) esters of said acids and a styrenic comonomer, the monomer ratio (a:b) in the copolymer ranging from 95:5 to 50:50 by weight, said copolymer being present in an amount effective to provide a measurable fluid holding capacity increase for the alloy fiber.
Claim 3
Dependent Claim
16 words
The alloy fiber of claim 1 wherein the monomer ratio (a:b) ranges from 80:20 to 60:40.
Claim 4
Dependent Claim
19 words
The alloy fiber of claim 1 wherein the fiber is at least partially neutralized with an alkali metal hydroxide.
Claim 5
Dependent Claim
46 words
The alloy fiber of claim 3 wherein the fiber is neutralized to an extent effective to provide of at least 5.5 cc./g. in the Syngyna test, said copolymer being present in an amount effective to provide a measurable fluid holding capacity increase for the alloy fiber.
Claim 6
Dependent Claim
33 words
The alloy fiber of claim 2 wherein the fiber contains about 5 to 40%, based on the weight of regenerated cellulose, of said copolymer, said copolymer being neutralized to at least 45 percent.
Claim 7
Dependent Claim
18 words
The alloy fiber of claim 5 wherein the nautralized copolymer is in alkali metal or ammonium salt form.
Claim 8
Dependent Claim
28 words
The alloy fiber of claim 5 wherein comonomer (b) is at least one of the hydroxyethyl and hydroxypropyl esters of at least one of acrylic and methacrylic acids.
Claim 9
Dependent Claim
15 words
The alloy fiber of claim 5 wherein the copolymer is an acrylic acid/hydroxyethyl methacrylate copolymer.
Claim 10
Dependent Claim
15 words
The alloy fiber of claim 5 wherein the copolymer is an acrylic acid/hydroxypropyl methacrylate copolymer.
Claim 11
Dependent Claim
15 words
The alloy fiber of claim 5 wherein the copolymer is an acrylic acid/hydroxyethyl acrylate copolymer.
Claim 12
Dependent Claim
15 words
The alloy fiber of claim 5 wherein the copolymer is an acrylic acid/hydroxypropyl acrylate copolymer.
Claim 13
Dependent Claim
15 words
The alloy fiber of claim 5 wherein the copolymer is a methacrylic acid/hydroxyethyl methacrylate copolymer.
Claim 14
Dependent Claim
14 words
The alloy fiber of claim 5 wherein the copolymer is a methacrylic acid/hydroxypropylmethacrylate copolymer.
Claim 15
Dependent Claim
14 words
The alloy fiber of claim 5 wherein the copolymer is an acrylic acid/styrenic copolymer.
Claim 16
Dependent Claim
14 words
The alloy fiber of claim 5 wherein the copolymer is an acrylic acid/styrene copolymer.
Claim 17
Independent Claim
127 words
A method of producing an alloy fiber having high fluid holding capacity while avoiding or minimizing loss of polymer additive, which comprises: (1) mixing with a filament forming viscose a copolymer of (a) at least one acid monomer selected from acrylic acid and methacrylic acid, and (b) at least one comoner selected from hydroxyalkyl (C 2 -C 6 ) esters of said acids and a styrenic comonomer, the monomer ratio (a:b) in the copolymer ranging from 95:5 to 50:50 by weight; (2) forming the mixture into a fiber; (3) coagulating and regenerating the fiber in an acid bath; and (4) at least partially neutralizing the regenerated fiber, said copolymer being present in an amount effective to provide a measurable fluid holding capacity increase for the alloy fiber.
Claim 18
Independent Claim
127 words
A method of producing an alloy fiber having high fluid holding capacity while avoiding or minimizing loss of polymer additive, which comprises: (1) mixing with a filament forming viscose a copolymer of (a) at least one acid monomer selected from acrylic acid and methacrylic acid, and (b) at least one comoner selected from hydroxyalkyl (C 2 -C 6 ) esters of said acids and a styrenic comonomer, the monomer ratio (a:b) in the copolymer ranging from 95:5 to 50:50 by weight; (2) forming the mixture into a fiber; (3) coagulating and regenerating the fiber in an acid bath; and (4) at least partially neutralizing the regenerated fiber, said copolymer being present in an amount effective to provide a measurable fluid holding capacity increase for the alloy fiber.
Claim 19
Dependent Claim
21 words
The method of claim 16 wherein the regenerated fiber is subjected to application of a lubricating and protective finish for cellulose.
Claim 20
Dependent Claim
17 words
The method of claim 17 wherein the finished fiber is subjected to drying in an alkaline state.
Claim 21
Dependent Claim
10 words
Alloy rayon fiber produced by the method of claim 16.
Claim 22
Dependent Claim
15 words
An article of manufacture comprising a mass of alloy fibers as defined in claim 5.
Claim 23
Dependent Claim
15 words
The article of claim 19 wherein the mass of alloy fibers comprises a non-woven array.
Claim 24
Dependent Claim
12 words
The article of claim 19 in the form of a surgical dressing.
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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) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |