US4144080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making amine oxide solution of cellulose
Assignee: Akzona Inc
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Filing: 1977-07-26
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Granted: 1979-03-13
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Expires: 1997-07-26
Abstract
Abstract A process is provided for making a solution of cellulose in an amine oxide. In accordance with one aspect of the invention, a solid precursor of a solution of cellulose in a tertiary amine oxide in the form of a chip or the like which has been prepared by suspending cellulose in a mixture containing a tertiary amine oxide and water is heated in the barrel of an extruder to dissolve the cellulose, and the resulting solution is extruded to provide an extrudate adapted to be shaped into a cellulosic product. In another aspect, a tertiary amine oxide solvent for cellulose can be added directly to the extruder where mixing and dissolution take place under the application of heat and pressure. It is further advantageous, in either case, where a non-solvent for the cellulose, compatible with the tertiary amine oxide and water, is employed.
Inventors
- 👤 Clarence C. McCorsley, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:54
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/096; C08B; C08B1/00; C08B1/003; D; D01; D01F; D01F2/00; C08J2301/00; C08J2301/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
45 words
A process for making a solution of cellulose in a tertiary amine oxide which comprises dissolving solid cellulose containing a tertiary amine oxide in an extruder and extruding the resulting solution from the said extruder before significant reduction in molecular weight of the cellulose occurs.
Claim 2
Dependent Claim
45 words
A process for making a solution of cellulose in a tertiary amine oxide which comprises dissolving solid cellulose containing a tertiary amine oxide in an extruder and extruding the resulting solution from the said extruder before significant reduction in molecular weight of the cellulose occurs.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the amine oxide contains a non-solvent.
Claim 4
Dependent Claim
10 words
The process of claim 2 wherein the non-solvent is water.
Claim 5
Dependent Claim
17 words
The process of claim 2 wherein the non-solvent is a mixture of water and an organic non-solvent.
Claim 6
Dependent Claim
44 words
A process for making a cellulose product which comprises heating solid cellulose wet with a tertiary amine oxide in an extruder until the cellulose dissolves, and extruding the resulting solution from the said extruder before significant reduction in molecular weight of the cellulose occurs.
Claim 7
Dependent Claim
44 words
A process for making a cellulose product which comprises heating solid cellulose wet with a tertiary amine oxide in an extruder until the cellulose dissolves, and extruding the resulting solution from the said extruder before significant reduction in molecular weight of the cellulose occurs.
Claim 8
Dependent Claim
12 words
The process of claim 5 wherein the amine oxide contains a non-solvent.
Claim 9
Dependent Claim
10 words
The process of claim 6 wherein the non-solvent is water.
Claim 10
Dependent Claim
17 words
The process of claim 5 wherein the non-solvent is a mixture of water and an organic non-solvent.
Claim 11
Dependent Claim
15 words
The process of claim 5 wherein pressure and shear are applied to the solid cellulose.
Claim 12
Dependent Claim
17 words
The process of claim 1 wherein said solid cellulose is cellulose impregnated with amine oxide and water.
Claim 13
Dependent Claim
17 words
The process of claim 2 wherein said solid cellulose is a solution of cellulose in said amine-oxide-non-solvent.
Claim 14
Dependent Claim
18 words
The process of claim 2 wherein said cellulose and said tertiary amine are added directly to said extruder.
Claim 15
Dependent Claim
103 words
A process for making a shaped cellulose product which comprises charging cellulose having tertiary amine oxide absorbed thereon to the barrel of an extruder at a temperature below that at which the said tertiary amine oxide will dissolve the cellulose, heating in the barrel of the extruder the said cellulose containing absorbed tertiary amine oxide to a temperature where the cellulose will dissolve in the said absorbed amine to form an extrudable solution, and extruding the resulting extrudable solution from the said extruder through a die to form a tertiary amine oxide-cellulose product before significant reduction in molecular weight of the cellulose occurs.
Claim 16
Dependent Claim
103 words
A process for making a shaped cellulose product which comprises charging cellulose having tertiary amine oxide absorbed thereon to the barrel of an extruder at a temperature below that at which the said tertiary amine oxide will dissolve the cellulose, heating in the barrel of the extruder the said cellulose containing absorbed tertiary amine oxide to a temperature where the cellulose will dissolve in the said absorbed amine to form an extrudable solution, and extruding the resulting extrudable solution from the said extruder through a die to form a tertiary amine oxide-cellulose product before significant reduction in molecular weight of the cellulose occurs.
Claim 17
Dependent Claim
26 words
The process of claim 1 wherein the cellulose is added to the extruder while suspended in a solvent therefor containing a tertiary amine oxide and water.
Claim 18
Dependent Claim
34 words
The process of claim 1 wherein the said solvent contains a tertiary amine oxide and an organic non-solvent for cellulose which is inert chemically with the tertiary amine oxide and is miscible with water.
Claim 19
Dependent Claim
53 words
A process for making a shaped cellulose product which comprises dissolving cellulose in a tertiary amine oxide solvent therefor in an extruder, extruding the resulting solution and precipitating the cellulose from the shaped solution substantially immediately after extrusion and before significant reduction in molecular weight of the cellulose, and drying the precipitated cellulose.
Claim 20
Dependent Claim
53 words
A process for making a shaped cellulose product which comprises dissolving cellulose in a tertiary amine oxide solvent therefor in an extruder, extruding the resulting solution and precipitating the cellulose from the shaped solution substantially immediately after extrusion and before significant reduction in molecular weight of the cellulose, and drying the precipitated cellulose.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |