US4813945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrahigh water-absorbing fiber forming composition
Assignee: CAMELOT S A Inc
•
Filing: 1988-08-04
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Granted: 1989-03-21
•
Expires: 2008-08-04
Abstract
Abstract A copolymer of recurring units of at least one αβ-unsaturated monomer and recurring units of at least one copolymerizable comonomer comprising, in its preferred embodiment from about 20 to about 80 percent pendant carboxylic acid units and from about 80 to about 20 percent pendant carboxylate salt units, is blended with a heterocyclic carbonate to produce a water-absorbing composition upon curing. The composition is particularly suitable for fiber formation.
Inventors
- 👤 Bi Le-Khac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:40
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/156; D; D01; D01F; D01F6/00; D01F6/02; D01F6/16; D01F6/28; D01F6/36
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
An article of manufacture comprising cured water-absorbing fibers and a means for supporting said fibers for absorption usage, wherein said water-absorbing fibers consist essentially of cured fibers formed from a composition of: (a) a copolymer containing from about 25 to about 75 mole percent recurring units at least one α,β-unsaturated monomer bearing at least one pendant unit selected from the group consisting of carboxylic acid units and derivatives of carboxylic acid units, and from about 75 to about 25 mole percent recurring units of at least one copolymerizable comonomer, wherein in said copolymer from about 20 to about 80 percent of the total pendant units introduced through the recurring units of the α,↑-unsaturated monomer must either be carboxylic acid units or must be converted into carboxylic acid units, and from about 80 to about 20 percent of the total pendant units must either be carboxylate salt units or must be converted into carboxylate metal salt units; and (b) a heterocyclic carbonate, said fibers being incorporated into said means for supporting.
Claim 2
Dependent Claim
170 words
An article of manufacture comprising cured water-absorbing fibers and a means for supporting said fibers for absorption usage, wherein said water-absorbing fibers consist essentially of cured fibers formed from a composition of: (a) a copolymer containing from about 25 to about 75 mole percent recurring units at least one α,β-unsaturated monomer bearing at least one pendant unit selected from the group consisting of carboxylic acid units and derivatives of carboxylic acid units, and from about 75 to about 25 mole percent recurring units of at least one copolymerizable comonomer, wherein in said copolymer from about 20 to about 80 percent of the total pendant units introduced through the recurring units of the α,↑-unsaturated monomer must either be carboxylic acid units or must be converted into carboxylic acid units, and from about 80 to about 20 percent of the total pendant units must either be carboxylate salt units or must be converted into carboxylate metal salt units; and (b) a heterocyclic carbonate, said fibers being incorporated into said means for supporting.
Claim 3
Dependent Claim
16 words
The article of manufacture of claim 1 in which said copolymer is a maleic anhydride/isobutylene copolymer.
Claim 4
Dependent Claim
19 words
The article of manufacture of claim 1 in which said means for supporting said composition is a disposable diaper.
Claim 5
Dependent Claim
18 words
The article of manufacture of claim 1 in which said means for supporting said composition is a tampon.
Claim 6
Dependent Claim
19 words
The article of manufacture of claim 1 in which said means for supporting said composition is a sanitary napkin.
Claim 7
Dependent Claim
21 words
The article of manufacture of claim 1 in which said means for supporting said composition is a surgical or dental sponge.
Claim 8
Dependent Claim
18 words
The article of manufacture of claim 1 in which said means for supporting said composition is a bandage.
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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) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |