US4908097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified cellulosic fibers
Assignee: Kimberly Clark Tissue Co
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Filing: 1988-10-26
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Granted: 1990-03-13
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Expires: 2008-10-26
Abstract
Abstract Disclosed are modified cellulosic fibers comprising the reaction product of linear, water-wettable polysaccharides with N,N'-methylenebisacrylamide and methods of making same. The materials are useful in the preparation of products characterized by their increased bulk and absorbency.
Inventors
- 👤 Larry Box
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:36
CPC Classifications
D; D21; D21H; D21H11/00; D21H11/16; D21H11/20; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C; C08; C08B; C08B15/00; C08B15/05; C08B15/06; C08B15/10; C08B31/00; C08B31/003; D06; D06M; D06M13/00; D06M13/322; D06M13/402; D06M13/41; D06M13/412; D06M14/00; D06M14/02; D06M14/04; D21H13/00; D21H13/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
A method for preparing modified cellulosic fibers which comprises the steps of: (a) applying up to 5% of N,N-methylenebiscarylamide by dry weight of said fibers; (b) applying an amount of alkali equivalent in alkali strength to up to ten parts sodium hydroxide to fiber by weight; (c) maintaining the consistency of said fibers at at least 10% so that a continuous aqueous phase around said fibers is absent and maintaining the temperature of said treated fibers below the boiling point of water throughout step (a) or (b) whichever is performed later, if performed separately or throughout steps (a) and (b) if performed simultaneously; and (d) excluding free radical initiators and air from the fibers treated in accordance with steps (a) and (b) until the modification reaction is complete.
Claim 2
Independent Claim
128 words
A method for preparing modified cellulosic fibers which comprises the steps of: (a) applying up to 5% of N,N-methylenebiscarylamide by dry weight of said fibers; (b) applying an amount of alkali equivalent in alkali strength to up to ten parts sodium hydroxide to fiber by weight; (c) maintaining the consistency of said fibers at at least 10% so that a continuous aqueous phase around said fibers is absent and maintaining the temperature of said treated fibers below the boiling point of water throughout step (a) or (b) whichever is performed later, if performed separately or throughout steps (a) and (b) if performed simultaneously; and (d) excluding free radical initiators and air from the fibers treated in accordance with steps (a) and (b) until the modification reaction is complete.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein steps (a) and (b) are performed simultaneously.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein the consistency is between 20 and 45%.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein said fibers are in the form of a batt or web.
Claim 6
Dependent Claim
12 words
The method of claim 4 wherein the consistency is greater than 45%.
Claim 7
Dependent Claim
10 words
The method of claim 1 wherein said fibers are fines.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein said fibers are wood pulp fibers derived from a mechanical pulping process.
Claim 9
Dependent Claim
8 words
The product made in accordance with claim 1.
Claim 10
Dependent Claim
8 words
The product made in accordance with claim 6.
Claim 11
Dependent Claim
8 words
The product made in accordance with claim 7.
Claim 12
Dependent Claim
20 words
An improved process for delignifying pulp by ozonization wherein the ozonization stage is preceded by the method of claim 1.
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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) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |