US5047197A
Expired / Lapsed
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Cellulose derivative spinning solutions having improved processability and process
Assignee: Nouryon Surface Chemistry AB
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Filing: 1985-11-19
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Granted: 1991-09-10
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Expires: 2005-11-19
Abstract
Abstract Cellulose derivative spinning solutions are provided, having an improved flow rate at comparable cellulose derivative content and pressure drop across the spinning nozzle, or a higher cellulose derivative content at comparable flow rate, comprising a cellulose derivative in solution in a solvent therefor, and a polyethylene glycol soluble in the solution and having an average molecular weight within the range from about 1.1 to about 4.5 million, in an amount to improve flow rate or increase cellulose derivative content; as well as a process for spinning such solutions through a spinning nozzle at improved flow rate or increased cellulose derivative content.
Inventors
- 👤 Ingemar Uneback
- 👤 Lars-Erik Noord
- 👤 Margreth Strandberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:04
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
84 words
A cellulose derivative spinning solution having an improved flow rate at comparable cellulose derivative content and pressure drop across the spinning nozzle, and a higher cellulose derivative content at comparable flow rate, comprising a cellulose derivative in solution in a spinning solution solvent therefor, and a polyethylene glycol having an average molecular weight within the range from about 2 to about 4 million, in an amount to improve flow rate at comparable cellulose derivative content and increase cellulose derivative content at comparable flow rate.
Claim 2
Dependent Claim
84 words
A cellulose derivative spinning solution having an improved flow rate at comparable cellulose derivative content and pressure drop across the spinning nozzle, and a higher cellulose derivative content at comparable flow rate, comprising a cellulose derivative in solution in a spinning solution solvent therefor, and a polyethylene glycol having an average molecular weight within the range from about 2 to about 4 million, in an amount to improve flow rate at comparable cellulose derivative content and increase cellulose derivative content at comparable flow rate.
Claim 3
Dependent Claim
23 words
A cellulose derivative spinning solution according to claim 1, in which the polyethylene glycol has an average molecular weight of about 35 million.
Claim 4
Dependent Claim
17 words
A cellulose derivative spinning solution according to claim 1, in which the cellulose derivative is cellulose acetate.
Claim 5
Dependent Claim
17 words
A cellulose derivative spinning solution according to claim 1, in which the cellulose derivative is cellulose xanthate.
Claim 6
Dependent Claim
17 words
A cellulose derivative spinning solution according to claim 1, in which the cellulose derivative is cellulose carbamate.
Claim 7
Dependent Claim
21 words
A cellulose derivative spinning solution according to claim 1, in which the cellulose derivative is cellulose dissolved in tertiary amine oxide.
Claim 8
Dependent Claim
31 words
A cellulose derivative spinning solution according to claim 1, in which the amount of polyethylene glycol is within the range from about 0.5 to about 10 kilograms per ton of cellulose.
Claim 9
Dependent Claim
31 words
A cellulose derivative spinning solution according to claim 1, in which the amount of polyethylene glycol is within the range from about 0.7 to about 5 kilograms per ton of cellulose.
Claim 10
Dependent Claim
19 words
A cellulose derivative spinning solution according to claim 1, comprising at least 10% by weight of the cellulose derivative.
Claim 11
Dependent Claim
86 words
A process for spinning a cellulose derivative into elongated forms through a spinning nozzle, which comprises spinning a cellulose derivative in solution in a cellulose spinning solvent in the presence of added polyethylene glycol having an average molecular weight within the range from about 2 to about 4 million in an amount to improve flow rate of the spinning solution through the spinning nozzle at comparable cellulose derivative content and pressure drop across the nozzle, or an increased cellulose derivative content at a comparable flow rate.
Claim 12
Dependent Claim
86 words
A process for spinning a cellulose derivative into elongated forms through a spinning nozzle, which comprises spinning a cellulose derivative in solution in a cellulose spinning solvent in the presence of added polyethylene glycol having an average molecular weight within the range from about 2 to about 4 million in an amount to improve flow rate of the spinning solution through the spinning nozzle at comparable cellulose derivative content and pressure drop across the nozzle, or an increased cellulose derivative content at a comparable flow rate.
Claim 13
Dependent Claim
20 words
A process according to claim 10 in which the molecular weight of the polyethylene glycol is of about 3.5 million.
Claim 14
Dependent Claim
14 words
A process according to claim 10 in which the cellulose derivative is cellulose acetate.
Claim 15
Dependent Claim
14 words
A process according to claim 10 in which the cellulose derivative is cellulose xanthate.
Claim 16
Dependent Claim
14 words
A process according to claim 10 in which the cellulose derivative is cellulose carbamate.
Claim 17
Dependent Claim
18 words
A process according to claim 10 in which the cellulose derivative is cellulose dissolved in tertiary amine oxide.
Claim 18
Dependent Claim
28 words
A process according to claim 10 in which the amount of polyethylene glycol is within the range from about 0.5 to about 10 kilograms per ton of cellulose.
Claim 19
Dependent Claim
29 words
A process according to claim 10 in which the amount of polyethylene glycol is within the range from about 0.7 to about 5 kilograms per ton of cellulose derivative.
Claim 20
Dependent Claim
19 words
A process according to claim 10 in which the amount of cellulose derivative is at least 10% by weight.
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) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |