Patent US4888093A successfully refreshed from Google Patents.
US4888093A
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Individualized crosslinked fibers and process for making said fibers
Assignee: Procter and Gamble Co
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Filing: 1989-02-23
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Granted: 1989-12-19
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Expires: 2009-02-23
Abstract
Abstract Individualized, crosslinked fiber, and process for making such fibers. The individualized, crosslinked fibers have between about 0.5 mole % and about 3.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, reacted with fibers in the form of intrafiber crosslink bonds, wherein the crosslinking agent is selected from the group consisting of C 2 -C 8 dialdehydes, C 2 -C 8 dialdehyde acid analogues having at least one aldehyde functionality, and oligomers of such C 2 -C 8 dialdehydes, and dialdehyde acid analogues. Preferably, the crosslinking agent is glutaraldehyde, and between about 0.75 mole % and about 2.5 mole % crosslinking agent react to form the intrafiber crosslink bonds. The individualized crosslinked fibers are useful in a variety of absorbent structure applications.
Inventors
- 👤 Walter L. Dean
- 👤 Danny R. Moore
- 👤 James W. Owens
- 👤 Howard L. Schoggen
- 👤 Robert M. Bourbon
- 👤 Jeffrey T. Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:31
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
125 words
Individualized, twisted and curled, crosslinked cellulosic fibers, said fibers comprising cellulosic fibers in substantially individual form having between about 0.5 mole % and about 3.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, said crosslinking agent being selected from the group consisting of C 2 -C 8 dialdehydes, acid analogues of said dialdehydes derived by having one aldehyde group of each of said dialdehydes replaced by a carboxyl group, and oligomers of said dialdehydes and said acid analogues, said fibers having been maintained in substantially individual form during drying and crosslinking, said crosslinking agent being sufficiently reacted with said fibers in intrafiber crosslink bond form to cause said fibers to have a water retention value of from about 28 to about 45.
Claim 2
Dependent Claim
125 words
Individualized, twisted and curled, crosslinked cellulosic fibers, said fibers comprising cellulosic fibers in substantially individual form having between about 0.5 mole % and about 3.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, said crosslinking agent being selected from the group consisting of C 2 -C 8 dialdehydes, acid analogues of said dialdehydes derived by having one aldehyde group of each of said dialdehydes replaced by a carboxyl group, and oligomers of said dialdehydes and said acid analogues, said fibers having been maintained in substantially individual form during drying and crosslinking, said crosslinking agent being sufficiently reacted with said fibers in intrafiber crosslink bond form to cause said fibers to have a water retention value of from about 28 to about 45.
Claim 3
Dependent Claim
93 words
Individualized, twisted and curled, crosslinked fibers, said fibers comprising cellulosic fibers in substantially individual form having between about 0.5 mole % and about 3.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, said crosslinking agent being selected from the group consisting of glutaraldehyde, glyoxal, and glyoxylic acid, said fibers having been maintained in substantially individual form during drying and crosslinking, said crosslinking agent being sufficiently reacted with said fibers in an intrafiber crosslink bond form, that the water retention value of said fibers is from about 28 to about 45.
Claim 4
Dependent Claim
93 words
Individualized, twisted and curled, crosslinked fibers, said fibers comprising cellulosic fibers in substantially individual form having between about 0.5 mole % and about 3.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, said crosslinking agent being selected from the group consisting of glutaraldehyde, glyoxal, and glyoxylic acid, said fibers having been maintained in substantially individual form during drying and crosslinking, said crosslinking agent being sufficiently reacted with said fibers in an intrafiber crosslink bond form, that the water retention value of said fibers is from about 28 to about 45.
Claim 5
Dependent Claim
13 words
The individualized, crosslinked fibers of claim 3, wherein said crosslinking agent is glutaraldehyde.
Claim 6
Dependent Claim
42 words
The individualized, crosslinked fibers, of claim 1, 2 or 3 wherein said fibers have between about 0.75 mole % and about 2.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, reacted therewith in the form of intrafiber crosslink bonds.
Claim 7
Dependent Claim
172 words
A process for making individualized, twisted and curled, crosslinked cellulosic fibers, said process comprising the steps of: a. providing cellulosic fibers; b. contacting said fibers with a solution containing a crosslinking agent selected from the group consisting of C 2 -C 8 dialdehydes, acid analogues of said dialdehydes derived by having one aldehyde group of each of said dialdehydes replaced by a carboxyl group, and oligomers of said dialdehydes and said acid analogues; c. mechanically separating said fibers into substantially individual form; and d. drying said fibers and reacting said crosslinking agent with said fibers to form crosslink bonds while said fibers are in substantially individual form, to form intrafiber crosslink bonds: said fibers contacted with a sufficient amount of crosslinking agent such that between about 0.5 mole % and about 3.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, reacts with said fibers to form said intrafiber crosslink bonds and causes said fibers, subsequent to crosslinking, to have water retention values of from about 28 to about 45.
Claim 8
Dependent Claim
172 words
A process for making individualized, twisted and curled, crosslinked cellulosic fibers, said process comprising the steps of: a. providing cellulosic fibers; b. contacting said fibers with a solution containing a crosslinking agent selected from the group consisting of C 2 -C 8 dialdehydes, acid analogues of said dialdehydes derived by having one aldehyde group of each of said dialdehydes replaced by a carboxyl group, and oligomers of said dialdehydes and said acid analogues; c. mechanically separating said fibers into substantially individual form; and d. drying said fibers and reacting said crosslinking agent with said fibers to form crosslink bonds while said fibers are in substantially individual form, to form intrafiber crosslink bonds: said fibers contacted with a sufficient amount of crosslinking agent such that between about 0.5 mole % and about 3.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, reacts with said fibers to form said intrafiber crosslink bonds and causes said fibers, subsequent to crosslinking, to have water retention values of from about 28 to about 45.
Claim 9
Dependent Claim
143 words
A process for making individualized, twisted and curled, crosslinked, cellulosic fibers, said process comprising the steps of: a. providing cellulosic fibers; b. contacting said fibers with a solution containing a crosslinking agent selected from the group consisting of glutaraldehyde, glyoxal, and glyoxylic acid; c. mechanically separating said fibers into substantially individual form; and d. drying said fibers and reacting said crosslinking agent with said fibers to form crosslink bonds while said fibers are in substantially individual form, to form intrafiber crosslink bonds; said fibers being contacted with a sufficient amount of crosslinking agent such that between about 0.5 mole % and about 3.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, reacts with said fibers to form said intrafiber crosslink bonds, and causes said fibers, subsequent to crosslinking, to have water retention values of from about 28 to about 45.
Claim 10
Dependent Claim
143 words
A process for making individualized, twisted and curled, crosslinked, cellulosic fibers, said process comprising the steps of: a. providing cellulosic fibers; b. contacting said fibers with a solution containing a crosslinking agent selected from the group consisting of glutaraldehyde, glyoxal, and glyoxylic acid; c. mechanically separating said fibers into substantially individual form; and d. drying said fibers and reacting said crosslinking agent with said fibers to form crosslink bonds while said fibers are in substantially individual form, to form intrafiber crosslink bonds; said fibers being contacted with a sufficient amount of crosslinking agent such that between about 0.5 mole % and about 3.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, reacts with said fibers to form said intrafiber crosslink bonds, and causes said fibers, subsequent to crosslinking, to have water retention values of from about 28 to about 45.
Claim 11
Dependent Claim
18 words
The process of claim 6, for making individualized, twisted, crosslinked, cellulosic fibers, wherein said crosslinking agent is glutaraldehyde.
Claim 12
Dependent Claim
41 words
The process of claim 7 for making individualized, twisted, crosslinked, cellulosic fibers, wherein between about 0.75 mole % and about 2.5 mole % crosslinking agent, calculated on cellulose anhydroglucose molar basis, react with said fibers to form said intrafiber crosslink bonds.
Claim 13
Dependent Claim
49 words
The process of claim 5 for making individualized, twisted, crosslinked fibers wherein said crosslinking agent is reacted with said fibers to form intrafiber crosslink bonds at acidic pH in the presence of at least one catalyst selected from the group consisting of mineral acids, organic acids, and acid salts.
Claim 14
Dependent Claim
30 words
The process of claim 9 for making individualized, twisted, crosslinked fibers, wherein said fibers are contacted with a solution containing said crosslinking agent and at least one of said catalysts.
Claim 15
Dependent Claim
18 words
The process of claim 10, wherein said solution contains an acid salt catalyst and an organic acid catalyst.
Claim 16
Dependent Claim
14 words
The process of claim 10, wherein said acid salt is a zinc nitrate salt.
Claim 17
Dependent Claim
31 words
The process of claim 11, wherein said acid salt is a zinc nitrate salt and said organic acid is citric acid, and said pH is between about 2 and about 5.
Claim 18
Dependent Claim
15 words
The process of claim 9, wherein said pH is between about 2 and about 5.
Claim 19
Dependent Claim
17 words
The process of claim 13 or 14, wherein said pH is between about 2.5 and about 3.5.
Claim 20
Dependent Claim
21 words
Individualized, twisted and curled, crosslinked fibers, said fibers being made by the process of claim 5, 8, 11, 13, or 14.
Claim 21
Dependent Claim
49 words
The process of claim 6 for making individualized, twisted, crosslinked fibers, wherein said crosslinking agent is reacted with said fibers to form intrafiber crosslink bonds at acidic pH in the presence of at least one catalyst selected from the group consisting of mineral acids, organic acids, and acid salts.
Claim 22
Dependent Claim
30 words
The process of claim 17 for making individualized, twisted, crosslinked fibers, wherein said fibers are contacted with a solution containing said crosslinking agent and at least one of said catalysts.
Claim 23
Dependent Claim
18 words
The process of claim 18 wherein said solution contains an acid salt catalyst and an organic acid catalyst.
Claim 24
Dependent Claim
14 words
The process of claim 18 wherein said acid salt is a zinc nitrate salt.
Claim 25
Dependent Claim
31 words
the process of claim 19 wherein said acid salt is a zinc nitrate salt and said organic acid is citric acid, and said pH is between about 2 and about 5.
Claim 26
Dependent Claim
15 words
The process of claim 17 wherein said pH is between about 2 and about 5.
Claim 27
Dependent Claim
17 words
The process of claim 21 or 22 wherein said pH is between about 2.5 and about 3.5.
Claim 28
Dependent Claim
20 words
Individualized, twisted and curled, crosslinked fibers, said fibers being made by the process of claim 6, 19, 21, or 22.
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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) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |