EP0251676A2
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EP
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Individualized, crosslinked fibers and process for making said fibers
Assignee: Procter and Gamble Co
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Filing: 1987-06-24
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Granted: —
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Expires: 2007-06-24
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 C₂ - C₈ dialdehydes, C₂ - C₈ dialdehyde acid analogues having at least one aldehyde functionality, and oligomers of such C₂ - C₈ 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 sturcture applications.
Inventors
- 👤 Walter Lee Dean
- 👤 Danny Raymond Moore
- 👤 James William Owens
- 👤 Howard Leon Schoggen
- 👤 Robert Michael Bourbon
- 👤 Jeffrey Todd Cook
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 01:29
CPC Classifications
D; D01; D01F; D01F8/00; D06; D06M; D06M13/00; D06M13/10; D06M13/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
84 words
Individualized, crosslinked cellulosic fibers, characterized in that said cellulosic fibers are in substantially individual form and incorporate between 0.5 mole % and 3.5 mole % crosslinking agent, calculated on a cellulose anhydrous molar basis, reacted with said fibers in an intrafiber crosslink bond form, wherein said crosslinking agent is selected from C₂-C₈ dialdehydes, C₂-C₈ dialdehyde acid analogues having at least one aldehyde group, and oligomers of said dialdehydes and dialdehyde acid analogues, said fibers having a water retention value (WRV) of less than 60.
Claim 2
Dependent Claim
84 words
Individualized, crosslinked cellulosic fibers, characterized in that said cellulosic fibers are in substantially individual form and incorporate between 0.5 mole % and 3.5 mole % crosslinking agent, calculated on a cellulose anhydrous molar basis, reacted with said fibers in an intrafiber crosslink bond form, wherein said crosslinking agent is selected from C₂-C₈ dialdehydes, C₂-C₈ dialdehyde acid analogues having at least one aldehyde group, and oligomers of said dialdehydes and dialdehyde acid analogues, said fibers having a water retention value (WRV) of less than 60.
Claim 3
Dependent Claim
23 words
Individualized, crosslinked fibers, according to claim 1, characterized in that said fibers incorporate between 0.75 mole % and 2.5 mole % crosslinking agent.
Claim 4
Dependent Claim
26 words
Individualized, crosslinked fibers, according to either one of claims 1 or 2, characterized in that said crosslinking agent is selected from glutaraldehyde, glyoxal, and glyoxylic acid.
Claim 5
Dependent Claim
20 words
Individualized, crosslinked fibers, according to any one of claims 1-3 characterized in that said WRV is between 28 and 50.
Claim 6
Dependent Claim
125 words
A process for making individualized, crosslinked cellulosic fibers, characterized in that said process comprises the steps of: a) providing cellulosic fibers; b) contacting said fibers with a crosslinking agent selected from C₂-C₈ dialdehydes, C₂-C₈ dialdehyde acid analogues having at least one aldehyde group, and oligomers of said dialdehydes and dialdehyde acid analogues; and c) reacting said crosslinking agent with said fibers in the substantial absence of interfiber bonds, to form intrafiber crosslink bonds; said fibers being contacted with a sufficient amount of crosslinking agent such that between 0.5 mole % and 3.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, react with said fibers to form said intrafiber crosslink bonds, wherein said fibers, subsequent to crosslinking have WRV's of less than 60.
Claim 7
Dependent Claim
125 words
A process for making individualized, crosslinked cellulosic fibers, characterized in that said process comprises the steps of: a) providing cellulosic fibers; b) contacting said fibers with a crosslinking agent selected from C₂-C₈ dialdehydes, C₂-C₈ dialdehyde acid analogues having at least one aldehyde group, and oligomers of said dialdehydes and dialdehyde acid analogues; and c) reacting said crosslinking agent with said fibers in the substantial absence of interfiber bonds, to form intrafiber crosslink bonds; said fibers being contacted with a sufficient amount of crosslinking agent such that between 0.5 mole % and 3.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, react with said fibers to form said intrafiber crosslink bonds, wherein said fibers, subsequent to crosslinking have WRV's of less than 60.
Claim 8
Dependent Claim
49 words
A process according to claim 5 characterized in that step (b) comprises contacting said fibers with a solution of the crosslinking agent followed by the additional steps of mechanically separating said fibers into substantially individual form; and drying said fibers prior to reacting said fibers with said crosslinking agent.
Claim 9
Dependent Claim
69 words
A process according to claim 5 characterized in that step (b) comprises contacting said fibers with a solution of the crosslinking agent and in that, in the crosslinking agent reaction step (c) said crosslinking solution contains a water-miscible, polar diluent and an insusfficient amount of water to cause said fibers to swell to a level greater than a level of swelling corresponding to fibers containing 30 wt. % water.
Claim 10
Dependent Claim
123 words
A process according to claim 5 characterized in that step (b) comprises contacting said fibers with an aqueous solution of the crosslinking agent said solution containing a sufficient amount of crosslinking agent such that said fibers do not substantially swell; followed by the additional steps of defluidizing said fibers and drying said fibers to a moisture content of less than 30 wt. %, based upon the total weight of the fibers; contacting said fibers with a solution containing a polar, water-miscible diluent and an insufficient amount of water to induce said fibers to swell beyond a degree of swelling corresponding to fibers having a 30 wt. % moisture content; and then reacting said crosslinking agent with said fibers to form intrafiber crosslink bonds.
Claim 11
Dependent Claim
23 words
A process for making individualized, crosslinked, cellulosic fibers according to any one of claims 6-8, characterized in that said crosslinking agent is glutaraldehyde.
Claim 12
Dependent Claim
44 words
A process for making individualized, crosslinked, cellulosic fibers according to any one of claims 6-9, characterized in that between 0.75 mole % and 2.5 mole % crosslinking agent, calculated on a cellulose anhydroglucose molar basis, react with said fibers to form intrafiber crosslink bonds.
References Cited (Backward Citations)
US3224926A
Cited
US3241553A
Cited
US3440135A
Cited
US4035147A
Cited
US3860003A
Cited
US3860003B1
Cited
US3860003B2
Cited
US3987968A
Cited
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