Patent EP0251674A2 successfully refreshed from Google Patents.
EP0251674A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for making individualized, cross-linked fibres
Assignee: Procter and Gamble Co
•
Filing: 1987-06-24
•
Granted: —
•
Expires: 2007-06-24
Abstract
Abstract Individualized, crosslinked fibers made by a) defibrating moistened, cellulosic fibers and at least partially drying the fibers under substantially unrestrained conditions, i.e., in the substantial absence of interfiber bonds, b) contacting the fibers with a crosslinking agent, c) reacting the crosslinking agent with the fibers in the substantial absence of interfiber bonds, to form intrafiber crosslink bonds, d) subjecting the fibers, while in a moistened condition, to a second defibration step, and then at least partially drying the fibers under substantially unrestrained conditions.
Inventors
- 👤 Howard Leon Schoggen
- 👤 Jeffrey Todd Cook
- 👤 Robert Michael Bourbon
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 15:18
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
A process for making individualized, crosslinked cellulosic fibers, said process comprising the steps of: a. providing moist cellulosic fibers having a moisture content of at least 30 wt. %: b. defibrating said fibers to provide said fibers in individual form, and drying said fibers to a moisture content of less than 30 wt. % under substantially unrestrained conditions; c. contacting said fibers with a crosslinking solution containing a water-miscible diluent, an amount of water which is insufficient to swell said fibers to a degree to swelling corresponding to fibers having a 30 wt.% moisture content, and a crosslinking agent, and reacting said crosslinking agent with said fibers in the substantial absence of interfiber bonds, to form intrafiber crosslink bonds; and d. defibrating said fibers and drying said fibers under substantially unrestrained conditions.
Claim 2
Dependent Claim
132 words
A process for making individualized, crosslinked cellulosic fibers, said process comprising the steps of: a. providing moist cellulosic fibers having a moisture content of at least 30 wt. %: b. defibrating said fibers to provide said fibers in individual form, and drying said fibers to a moisture content of less than 30 wt. % under substantially unrestrained conditions; c. contacting said fibers with a crosslinking solution containing a water-miscible diluent, an amount of water which is insufficient to swell said fibers to a degree to swelling corresponding to fibers having a 30 wt.% moisture content, and a crosslinking agent, and reacting said crosslinking agent with said fibers in the substantial absence of interfiber bonds, to form intrafiber crosslink bonds; and d. defibrating said fibers and drying said fibers under substantially unrestrained conditions.
Claim 3
Dependent Claim
157 words
A process for making individualized, crosslinked cellulosic fibers, said process comprising the steps of: a. providing moist cellulosic fibers having a moisture content of at least 30 wt. %; b. defibrating said fibers to provide said fibers in a substantially individual form and drying said fibers to a moisture content of less than 30 wt. % under substantially unrestrained conditions; c. contacting said fibers with a crosslinking agent in an aqueous solution, d. defluidizing said fibers and drying said fibers to a moisture content of less than 30%; e. contacting said fibers with a solution containing a water-miscible diluent and an amount of water which is insufficient to swell said fibers to a degree of swelling corresponding to fibers having a 30% moisture content; f. reacting said crosslinking agent with said fibers in the substantial absence of interfiber bonds, to form intrafiber crosslink bonds; and g. defibrating said fibers and drying said fibers under substantially unrestrained conditions.
Claim 4
Dependent Claim
157 words
A process for making individualized, crosslinked cellulosic fibers, said process comprising the steps of: a. providing moist cellulosic fibers having a moisture content of at least 30 wt. %; b. defibrating said fibers to provide said fibers in a substantially individual form and drying said fibers to a moisture content of less than 30 wt. % under substantially unrestrained conditions; c. contacting said fibers with a crosslinking agent in an aqueous solution, d. defluidizing said fibers and drying said fibers to a moisture content of less than 30%; e. contacting said fibers with a solution containing a water-miscible diluent and an amount of water which is insufficient to swell said fibers to a degree of swelling corresponding to fibers having a 30% moisture content; f. reacting said crosslinking agent with said fibers in the substantial absence of interfiber bonds, to form intrafiber crosslink bonds; and g. defibrating said fibers and drying said fibers under substantially unrestrained conditions.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.