US4044090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing regenerated cellulosic product
Assignee: Rayonier Inc
•
Filing: 1975-07-09
•
Granted: 1977-08-23
•
Expires: 1995-07-09
Abstract
Abstract A regenerated cellulosic product is produced by nitrosating and dissolving a cellulosic material in a solution comprising a dialkylacylamide solvent and adding from 2 to 25% by weight, based on the weight of the solution, of a tertiary amine to form a soluble cellulose nitrite ester, contacting the cellulose ester with a coagulant therefore, stretching the coagulated cellulose ester prior to complete regeneration thereof and then completing the regeneration of the cellulose to produce a regenerated cellulosic product.
Inventors
- 👤 Norman A. Portnoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:45
CPC Classifications
C; C08; C08B; C08B16/00; C08B5/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
A process for producing a regenerated cellulosic product comprising nitrosating and dissolving a cellulosic material in a solution comprising a dialkylacylamide solvent and adding from 2-25% by weight of the solution of a tertiary amine to form a soluble cellulose nitrite ester, forming the cellulose ester into a filament or other shape, contacting the cellulose ester with a coagulant therefore, stretching the coagulated cellulose ester prior to complete regeneration thereof, and completing the regeneration of the cellulose,
Claim 2
Dependent Claim
77 words
A process for producing a regenerated cellulosic product comprising nitrosating and dissolving a cellulosic material in a solution comprising a dialkylacylamide solvent and adding from 2-25% by weight of the solution of a tertiary amine to form a soluble cellulose nitrite ester, forming the cellulose ester into a filament or other shape, contacting the cellulose ester with a coagulant therefore, stretching the coagulated cellulose ester prior to complete regeneration thereof, and completing the regeneration of the cellulose,
Claim 3
Dependent Claim
12 words
The process of claim 1 in which the tertiary amine is pyridine.
Claim 4
Dependent Claim
11 words
The process of claim 1 in which the dialkylacylamide is dimethylformamide.
Claim 5
Dependent Claim
17 words
The process of claim 1 in which the solution contains from 6-14% by weight of the amine.
Claim 6
Dependent Claim
16 words
The process of claim 1 in which the coagulant comprises a 1-3 carbon aliphatic monohydroc alcohol.
Claim 7
Dependent Claim
17 words
The process of claim 1 in which the coagulant contains from 1-12% by weight of an acid.
Claim 8
Dependent Claim
18 words
The process of claim 1 in which the tertiary amine is added after dissolution of the cellulosic material.
Claim 9
Dependent Claim
14 words
The process of claim 1 in which the regenerated cellulosic product is a fiber.
Claim 10
Dependent Claim
13 words
The process of claim 1 in which the nitrosating agent is dinitrogen tetroxide.
References Cited (Backward Citations)
US3236669A
Cited
US3702843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |