US4324593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shapeable tertiary amine N-oxide solution of cellulose, shaped cellulose product made therefrom and process for preparing the shapeable solution and cellulose products
Assignee: Akzona Inc
•
Filing: 1978-09-01
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Granted: 1982-04-13
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Expires: 1998-09-01
Abstract
Abstract A solution containing cellulose dissolved in a mixture of a tertiary amine N-oxide solvent for cellulose and a compound which increases the rate of dissolution of cellulose in the solvent such as a tertiary amine or other compound which increases the pH of the solvent, a process for making such a solution and a process for making shaped articles therefrom are provided. The solvent dissolves cellulose at a faster rate and at a lower temperature than a solvent consisting of the same tertiary amine N-oxide.
Inventors
- 👤 Julianna K. Varga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:24
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/096; C08B; C08B1/00; C08B1/003; C08J2301/00; C08J2301/02
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
50 words
In a process for preparing a solution containing cellulose dissolved in a solvent containing a tertiary amine N-oxide, the improvement which comprises dissolving the cellulose in a solvent containing both a tertiary amine N-oxide and an alkaline compound which increases the rate at which the cellulose dissolves in the solvent.
Claim 2
Dependent Claim
50 words
In a process for preparing a solution containing cellulose dissolved in a solvent containing a tertiary amine N-oxide, the improvement which comprises dissolving the cellulose in a solvent containing both a tertiary amine N-oxide and an alkaline compound which increases the rate at which the cellulose dissolves in the solvent.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the said compound mixed with the tertiary amine N-oxide increases the pH of the solvent.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the compound which increases the pH is a tertiary amine.
Claim 5
Dependent Claim
26 words
The process of claim 3 wherein the tertiary amine has the same composition as the tertiary amine which was oxidized to prepare the tertiary amine N-oxide.
Claim 6
Dependent Claim
41 words
A process for accelerating the rate at which cellulose dissolves in a solvent containing a tertiary amine N-oxide which comprises increasing the pH of the solvent above the pH of the tertiary amine N-oxide and soaking cellulose therein until it dissolves.
Claim 7
Dependent Claim
41 words
A process for accelerating the rate at which cellulose dissolves in a solvent containing a tertiary amine N-oxide which comprises increasing the pH of the solvent above the pH of the tertiary amine N-oxide and soaking cellulose therein until it dissolves.
Claim 8
Dependent Claim
51 words
In a process for making shaped cellulose articles which comprises dissolving cellulose in a solvent therefor containing a tertiary amine N-oxide and water, shaping the resulting solution and precipitating the cellulose, the improvement which comprises dissolving the cellulose in a solvent containing a mixture of tertiary amine N-oxide and an amine.
Claim 9
Dependent Claim
51 words
In a process for making shaped cellulose articles which comprises dissolving cellulose in a solvent therefor containing a tertiary amine N-oxide and water, shaping the resulting solution and precipitating the cellulose, the improvement which comprises dissolving the cellulose in a solvent containing a mixture of tertiary amine N-oxide and an amine.
Claim 10
Dependent Claim
34 words
The process of claim 6 wherein the mixture containing a tertiary amine N-oxide, water and cellulose also contains about 0.03% to about 21% by weight tertiary amine based on the weight of said mixture.
Claim 11
Dependent Claim
24 words
The process of claim 6 wherein the mixture contains from about 1.4% to about 29% water and about 0.03% to about 21% tertiary amine.
Claim 12
Dependent Claim
12 words
The process of claim 6 wherein the solvent contains an aprotic solvent.
Claim 13
Dependent Claim
26 words
The process of claim 8 wherein the tertiary amine has the same composition as the tertiary amine that was oxidized to produce the tertiary amine N-oxide.
Claim 14
Dependent Claim
20 words
The process of claim 3 wherein the tertiary amine is one which when oxidized is not a solvent for cellulose.
Claim 15
Dependent Claim
19 words
The process of claim 3 wherein the tertiary amine is one which when oxidized is a solvent for cellulose.
Claim 16
Dependent Claim
20 words
The process of claim 2 wherein the compound which increases the pH of the solvent is an alkali metal hydroxide.
Claim 17
Dependent Claim
18 words
The process of claim 2 wherein the compound which increases the pH of the solvent is aqueous ammonia.
Claim 18
Dependent Claim
16 words
The process of claim 2 wherein the compound which increases the pH is a primary amine.
Claim 19
Dependent Claim
16 words
The process of claim 2 wherein the compound which increases the pH is a secondary amine.
Claim 20
Dependent Claim
45 words
The process of claim 3 wherein the tertiary amine N-oxide is N-methylmorpholine N-oxide, N,N-dimethylcyclohexylamine N-oxide, N,N,N-triethylamine N-oxide, N,N-dimethylethanolamine N-oxide, N,N-dimethylbenzylamine N-oxide, N-methylhomopiperidine N-oxide, N-methylpiperidine N-oxide or 2(2-hydroxypropoxy)-N-ethyl-N,N-dimethylamine N-oxide and the tertiary amine is the same as the one oxidized to form said tertiary amine N-oxide.
Claim 21
Dependent Claim
44 words
The process of claim 3 wherein the tertiary amine N-oxide is N-methylmorpholine N-oxide, N,N-dimethylcyclohexylamine N-oxide, N,N,N-triethylamine N-oxide, N,N-dimethylethanolamine N-oxide, N,N-dimethylbenzylamine N-oxide, N-methylhomopiperidine N-oxide, N-methylpiperidine N-oxide or 2(2-hydroxypropoxy)-N-ethyl-N,N-dimethylamine N-oxide and the tertiary amine is different from the one oxidized to produce the tertiary amine N-oxide.
Claim 22
Dependent Claim
49 words
The process of claim 2 wherein the tertiary amine N-oxide is N-methylmorpholine N-oxide, N,N-dimethylcyclohexylamine N-oxide, N,N,N-triethylamine N-oxide, N,N-dimethylethanolamine N-oxide, N,N-dimethylbenzylamine N-oxide, N-methylhomopiperidine N-oxide, N-methylpiperidine N-oxide or 2(2-hydroxypropoxy)-N-ethyl-N,N-dimethylamine N-oxide and the compound added to increase the pH is an alkali metal hydroxide, aqueous ammonia, a secondary amine or primary amine.
Claim 23
Dependent Claim
42 words
A solution containing cellulose dissolved in a solvent containing a tertiary amine N-oxide and an alkaline compound which accelerates dissolution of cellulose in the solvent, said solution being a liquid at a temperature below the melting point of the tertiary amine N-oxide.
Claim 24
Dependent Claim
42 words
A solution containing cellulose dissolved in a solvent containing a tertiary amine N-oxide and an alkaline compound which accelerates dissolution of cellulose in the solvent, said solution being a liquid at a temperature below the melting point of the tertiary amine N-oxide.
Claim 25
Dependent Claim
7 words
The solution of claim 20 containing water.
Claim 26
Dependent Claim
19 words
The solution of claim 20 having a pH higher than the pH of the tertiary amine N-oxide in water.
Claim 27
Dependent Claim
17 words
The solution of claim 21 having a pH higher than the pH of the tertiary amine N-oxide.
Claim 28
Dependent Claim
22 words
The solution of claim 20 or claim 21 in which the said alkaline compound which accelerates dissolution of cellulose is an amine.
Claim 29
Dependent Claim
22 words
The solution of claim 20 or claim 21 in which the said alkaline compound which accelerates dissolution of cellulose is aqueous ammonia.
Claim 30
Dependent Claim
22 words
The solution of claim 20 or claim 21 in which the said compound which accelerates dissolution of cellulose is alkali metal hydroxide.
Claim 31
Dependent Claim
27 words
The process of claim 1 wherein the said compound which increases the rate of dissolution of cellulose in the solvent has a pH of more than 7.
Claim 32
Dependent Claim
23 words
The process of claim 1 wherein the compound added to increase the rate of dissolution of cellulose in the solution is sodium pyrophosphate.
Claim 33
Dependent Claim
67 words
In a process for preparing a solution containing cellulose dissolved in a solvent containing a tertiary amine N-oxide, the improvement which comprises mixing with the solvent and cellulose to increase the rate at which the cellulose dissolves, ammonia, an alkali metal hydroxide or a compound having the formula NR 3 or NR 4 OH wherein R is hydrogen, alkyl, aralkyl, aryl hydroxyl, primary amine or substituted amine.
Claim 34
Dependent Claim
67 words
In a process for preparing a solution containing cellulose dissolved in a solvent containing a tertiary amine N-oxide, the improvement which comprises mixing with the solvent and cellulose to increase the rate at which the cellulose dissolves, ammonia, an alkali metal hydroxide or a compound having the formula NR 3 or NR 4 OH wherein R is hydrogen, alkyl, aralkyl, aryl hydroxyl, primary amine or substituted amine.
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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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |