US4242242A
Expired / Lapsed
US
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Highly absorbent fibers of rayon with sulfonic acid polymer incorporated
Assignee: Akzona Inc
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Filing: 1977-06-10
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Granted: 1980-12-30
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Expires: 1997-06-10
Abstract
Abstract Highly absorbent cellulosic fibers are made by incorporating therein from 2%-35% based on the weight of cellulose of a polymerized acrylamido-2-methylpropane sulfonic acid or a copolymer of acrylamido-2-methylpropane sulfonic acid with any one or combination of other polymerizable hydrophilic monomers such as acrylic acid, methacrylic acid, acrylonitrile and the like.
Inventors
- 👤 Thomas C. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:48
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
47 words
A highly absorbent cellulosic fiber containing in a physical admixture with cellulose at least about 2% by weight based on the weight of the cellulose of a homopolymer consisting essentially of polymerized 2-acrylamido-2-methylpropane sulfonic acid monomers or the partial or complete alkali metal or ammonium salts thereof.
Claim 2
Dependent Claim
47 words
A highly absorbent cellulosic fiber containing in a physical admixture with cellulose at least about 2% by weight based on the weight of the cellulose of a homopolymer consisting essentially of polymerized 2-acrylamido-2-methylpropane sulfonic acid monomers or the partial or complete alkali metal or ammonium salts thereof.
Claim 3
Dependent Claim
29 words
The fiber as in claim 1 in which said homopolymer is in the ratio of about 5 to 15 parts of said homopolymer to 100 parts of said cellulose.
Claim 4
Dependent Claim
17 words
The fiber as in claim 1 in which said sulfonic acid is in the sodium salt form.
Claim 5
Dependent Claim
29 words
The fiber as in claim 1 in which said homopolymer is in the ratio by weight of about 5 parts of said homopolymer to 100 parts of said cellulose.
Claim 6
Dependent Claim
38 words
The highly absorbent fiber of claim 1 prepared by adding from about 2% to about 35% by weight based on the weight of the cellulose of said homopolymer to the viscose solution from which said fiber is made.
Claim 7
Dependent Claim
29 words
The fiber as in claim 1 in which said homopolymer is in the ratio by weight of about 15 parts of said homopolymer to 100 parts of said cellulose.
Claim 8
Dependent Claim
61 words
A process for improving the fluid absorbency of a regenerated cellulose fiber, said process comprising spinning a spinnable viscose solution containing both cellulose and a homopolymer of 2-acrylamido-2-methylpropane sulfonic acid monomer or an alkali metal or ammonium salt thereof to form a regenerated cellulose fiber having at least 2% of said polymerization product or a salt thereof physically mixed with cellulose.
Claim 9
Dependent Claim
61 words
A process for improving the fluid absorbency of a regenerated cellulose fiber, said process comprising spinning a spinnable viscose solution containing both cellulose and a homopolymer of 2-acrylamido-2-methylpropane sulfonic acid monomer or an alkali metal or ammonium salt thereof to form a regenerated cellulose fiber having at least 2% of said polymerization product or a salt thereof physically mixed with cellulose.
Claim 10
Dependent Claim
58 words
A highly absorbent cellulosic fiber containing in a physical admixture with cellulose at least about 2% by weight based on the weight of the cellulose of a copolymer comprising at least about 10% by weight of 2-acrylamido-2-methylpropane sulfonic acid monomers or the partial or complete alkali metal or ammonium salts thereof and at least one polymerizable, hydrophilic comonomer.
Claim 11
Dependent Claim
58 words
A highly absorbent cellulosic fiber containing in a physical admixture with cellulose at least about 2% by weight based on the weight of the cellulose of a copolymer comprising at least about 10% by weight of 2-acrylamido-2-methylpropane sulfonic acid monomers or the partial or complete alkali metal or ammonium salts thereof and at least one polymerizable, hydrophilic comonomer.
Claim 12
Dependent Claim
22 words
The fiber as in claim 8 wherein said comonomer is selected from the group consisting of acrylonitrile, acrylic acid and methacrylic acid.
Claim 13
Dependent Claim
31 words
The fiber as in claim 9 wherein said copolymer is in the ratio by weight of about 35-70 parts of said hydrophilic comonomer and 65-30 parts of said sulfonic acid monomer.
Claim 14
Dependent Claim
13 words
The fiber as in claim 10 in which said comonomer is acrylic acid.
Claim 15
Dependent Claim
12 words
The fiber as in claim 10 in which said comonomer is acrylonitrile.
Claim 16
Dependent Claim
17 words
The fiber as in claim 10 in which said sulfonic acid is in the sodium salt form.
Claim 17
Dependent Claim
25 words
The fiber as in claim 12 in which said comonomer is hydrolyzed with aqueous base to convert the nitrile groups to amide and/or acid groups.
Claim 18
Dependent Claim
12 words
The fiber of claim 10, in which said comonomer is, methacrylic acid.
Claim 19
Dependent Claim
30 words
The fiber as in claim 8 wherein said polymerizable, hydrophilic comonomer contains a functional group selected from the group consisting of carboxylic acid, hydroxyl, amide, ether, sulfonic acid and nitrile.
Claim 20
Dependent Claim
18 words
The fiber as in claim 8 wherein said copolymer comprises additionally at least one polymerizable insolubilizing reactive comonomer.
Claim 21
Dependent Claim
35 words
The fiber as in claim 17, wherein said reactive comonomer is selected from the group consisting essentially of N-methylol acrylamide, hydroxymethyl diacetone acrylamide, glycidyl methacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, and acrylamide.
Claim 22
Dependent Claim
28 words
The fibers in claim 8 in which said copolymer is in the ratio of about 5 to 15 parts of said copolymer to 100 parts of said cellulose.
Claim 23
Dependent Claim
29 words
The fiber as in claim 8 in which said copolymer is in the ratio by weight of about 5 parts of said copolymer to 100 parts of said cellulose.
Claim 24
Dependent Claim
38 words
The highly absorbent fiber of claim 8 prepared by adding from about 2% to about 35% by weight based on the weight of the cellulose of said copolymer to the viscose solution from which said fiber is made.
Claim 25
Dependent Claim
29 words
The fiber as in claim 8 in which said copolymer is in the ratio by weight of about 15 parts of said copolymer to 100 parts of said cellulose.
Claim 26
Dependent Claim
78 words
A highly absorbent cellulose fiber containing in a physical admixture with cellulose at least about 2% by weight based on the weight of the cellulose of a copolymer consisting essentially of at least about 10% by weight of 2-acrylamido-2-methylpropane sulfonic acid monomers or the partial or complete alkali metal or ammonium salts thereof and at least one hydrophilic polymerizable comonomer capable of reacting with cellulose or other functional groups in said copolymer so as to insolubilize said copolymer.
Claim 27
Dependent Claim
78 words
A highly absorbent cellulose fiber containing in a physical admixture with cellulose at least about 2% by weight based on the weight of the cellulose of a copolymer consisting essentially of at least about 10% by weight of 2-acrylamido-2-methylpropane sulfonic acid monomers or the partial or complete alkali metal or ammonium salts thereof and at least one hydrophilic polymerizable comonomer capable of reacting with cellulose or other functional groups in said copolymer so as to insolubilize said copolymer.
Claim 28
Dependent Claim
24 words
The fiber as in claim 23, in which said copolymer contains from about 10% to about 90% by weight of said sulfonic acid monomer.
Claim 29
Dependent Claim
35 words
The fiber as in claim 23, wherein said reactive comonomer is selected from the group consisting essentially of N-methylol acrylamide, hydroxyethyl diacetone acrylamide, glycidyl methacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, and acrylamide.
Claim 30
Dependent Claim
28 words
The fibers in claim 23, in which said copolymer is in the ratio of about 5 to 15 parts of said copolymer to 100 parts of said cellulose.
Claim 31
Dependent Claim
38 words
The highly absorbent fiber of claim 23, prepared by adding from about 2% to about 35% by weight based on the weight of the cellulose of said copolymer to the viscose solution from which said fiber is made.
Claim 32
Dependent Claim
78 words
A process for improving the fluid absorbency of a regenerated cellulose fiber, said process comprising spinning a spinnable viscose solution containing both cellulose and a copolymer comprising from about 10% to about 90% by weight of a 2-acrylamido-2-methylpropane sulfonic acid monomer or an alkali metal or ammonium salt thereof and at least one polymerizable, hydrophilic comonomer to form a regenerated cellulose fiber having at least 2% of said polymerization product or a salt thereof physically mixed with cellulose.
Claim 33
Dependent Claim
78 words
A process for improving the fluid absorbency of a regenerated cellulose fiber, said process comprising spinning a spinnable viscose solution containing both cellulose and a copolymer comprising from about 10% to about 90% by weight of a 2-acrylamido-2-methylpropane sulfonic acid monomer or an alkali metal or ammonium salt thereof and at least one polymerizable, hydrophilic comonomer to form a regenerated cellulose fiber having at least 2% of said polymerization product or a salt thereof physically mixed with cellulose.
Claim 34
Dependent Claim
78 words
A process for improving the fluid absorbency of a regenerated cellulose fiber, said process comprising spinning a spinnable viscose solution containing both cellulose and a copolymer consisting essentially of at least about 10% by weight of a 2-acrylamido-2-methylpropane sulfonic acid monomer or an alkali metal or ammonium salt thereof and a hydrophilic polymerizable insolubilizing reactive comonomer to form a regenerated cellulose fiber having at least 2% of said polymerization product or a salt thereof physically mixed with cellulose.
Claim 35
Dependent Claim
78 words
A process for improving the fluid absorbency of a regenerated cellulose fiber, said process comprising spinning a spinnable viscose solution containing both cellulose and a copolymer consisting essentially of at least about 10% by weight of a 2-acrylamido-2-methylpropane sulfonic acid monomer or an alkali metal or ammonium salt thereof and a hydrophilic polymerizable insolubilizing reactive comonomer to form a regenerated cellulose fiber having at least 2% of said polymerization product or a salt thereof physically mixed with cellulose.
References Cited (Backward Citations)
US3213053A
Cited
US3708446A
Cited
US3709780A
Cited
US3770673A
Cited
US3826767A
Cited
US3929740A
Cited
US3951889A
Cited
US4076663A
Cited
US4066584A
Cited
US4028290A
Cited
US4051086A
Cited
US4104214A
Cited
US4134863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |