US4129640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing shaped articles of cellulose
Assignee: Rhone Poulenc Textile SA
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Filing: 1977-07-14
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Granted: 1978-12-12
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Expires: 1997-07-14
Abstract
Abstract A process for producing shaped articles of cellulose is disclosed, wherein the process includes steps of contacting a shaped solution of cellulose in DMSO and formaldehyde, containing at least 6% by weight of cellulose based on the volume of DMSO, and containing formaldehyde in a weight ratio of formaldehyde/cellulose of about 0.2 to about 0.6, with a coagulating solution of DMSO and water at a temperature no greater than 10° C. The coagulant bath generally contains 30 to 50% by weight of DMSO, and the solutions are readily coagulated at coagulation speeds appropriate for commercial practice, and generally the coagulation occurs in less than 20 seconds. The products produced by the present process are shaped articles such as filaments, fibers, films, sheets and membranes, and especially filaments which are suitable for use in the textile field.
Inventors
- 👤 Henry Rodier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:34
CPC Classifications
D; D01; D01F; D01F2/00; C; C08; C08B; C08B16/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
67 words
Process for producing shaped articles of cellulose, said process comprising contacting a solution of cellulose in DMSO and formaldehyde, containing at least 6% by weight of cellulose based on the volume of DMSO and containing formaldehyde in a weight ratio of formaldehyde/cellulose of 0.2 to 0.6, in said shaped form with a coagulating solution of DMSO and water at a temperature of no greater than 10° C.
Claim 2
Dependent Claim
67 words
Process for producing shaped articles of cellulose, said process comprising contacting a solution of cellulose in DMSO and formaldehyde, containing at least 6% by weight of cellulose based on the volume of DMSO and containing formaldehyde in a weight ratio of formaldehyde/cellulose of 0.2 to 0.6, in said shaped form with a coagulating solution of DMSO and water at a temperature of no greater than 10° C.
Claim 3
Dependent Claim
10 words
Process of claim 1, wherein said shaped articles are films.
Claim 4
Dependent Claim
10 words
Process of claim 1, wherein said shaped articles are filaments.
Claim 5
Dependent Claim
14 words
Process of claim 3, wherein said cellulose has a DP of at least 400.
Claim 6
Dependent Claim
16 words
Process of claim 4, wherein the coagulant bath contains 30 to 50% by weight of DMSO.
Claim 7
Dependent Claim
13 words
Process of claim 5, wherein the formaldehyde/cellulose weight ratio is 0.2 to 0.4.
Claim 8
Dependent Claim
15 words
Process of claim 4, wherein the temperature of the coagulant bath is about +2° C.
Claim 9
Dependent Claim
12 words
Process of claim 4, including the further step of drawing said filaments.
Claim 10
Dependent Claim
94 words
Process for producing filaments of cellulose, said process comprising extruding a solution of cellulose having a DP of at least 400 in DMSO and formaldehyde, said solution containing at least 6% by weight of cellulose based on the volume of DMSO, and containing formaldehyde in a formaldehyde/cellulose weight ratio of 0.2 to 0.6, into a coagulating bath at a temperature no greater than 10° C. of water and 30 to 50% by weight of DMSO, whereby filaments having properties similar to regenerated cellulose are obtained in a coagulation time of less than 20 seconds.
Claim 11
Dependent Claim
94 words
Process for producing filaments of cellulose, said process comprising extruding a solution of cellulose having a DP of at least 400 in DMSO and formaldehyde, said solution containing at least 6% by weight of cellulose based on the volume of DMSO, and containing formaldehyde in a formaldehyde/cellulose weight ratio of 0.2 to 0.6, into a coagulating bath at a temperature no greater than 10° C. of water and 30 to 50% by weight of DMSO, whereby filaments having properties similar to regenerated cellulose are obtained in a coagulation time of less than 20 seconds.
Claim 12
Dependent Claim
10 words
Process of claim 1, wherein said shaped articles are membranes.
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) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |