Patent US4173613A successfully refreshed from Google Patents.
US4173613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing cellulosic shaped articles
Assignee: Rhone Poulenc Textile SA
•
Filing: 1977-07-14
•
Granted: 1979-11-06
•
Expires: 1997-07-14
Abstract
Abstract A process for producing shaped articles of cellulose is disclosed, wherein a solution of cellulose in dimethylsulphoxide (DMS0) and formaldehyde, at a formaldehyde/cellulose weight ratio of 0.2 to 2, and at a cellulose concentration of at least 6% by weight based on the volume of DMSO, is spun into a coagulant bath. The coagulant bath contains water, DMSO and ammonia or an ammonium salt, with the DMSO present in an amount of about 25 to 60 weight percent of the mixture of DMSO and water. The ammonia or ammonium salt is present in an amount, calculated as ammonia, of at least 1 gram per liter in the mixture of DMSO and water. The use of the coagulant bath of the present invention permits the cellulosic solution to be formed into shaped articles, and especially into filaments which are useful in the textile field. Other shaped articles which can be made from the cellulosic solution include fibers, threads, membranes, films, and sheets.
Inventors
- 👤 Henry Rodier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:18
CPC Classifications
C; C08; C08B; C08B16/00; D; D01; D01F; D01F2/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
119 words
Process for producing shaped articles of cellulose, said process comprising contacting a solution in said shaped form with a coagulant bath containing water, DMSO, and ammonia or an ammonium salt to coagulate said solution therein, the DMSO present in an amount of about 25 to 60 weight percent, based on the amount of DMSO and water, and the ammonia or ammonium salt present in an amount, calculated as ammonia, of at least 1 gram per liter of the mixture of DMSO and water, said solution containing cellulose in dimethylsulphoxide (DMSO) and formaldehyde at a formaldehyde/cellulose weight ratio of about 0.2 to 2 and at a cellulose concentration of at least 6% by weight based on the volume of DMSO.
Claim 2
Dependent Claim
119 words
Process for producing shaped articles of cellulose, said process comprising contacting a solution in said shaped form with a coagulant bath containing water, DMSO, and ammonia or an ammonium salt to coagulate said solution therein, the DMSO present in an amount of about 25 to 60 weight percent, based on the amount of DMSO and water, and the ammonia or ammonium salt present in an amount, calculated as ammonia, of at least 1 gram per liter of the mixture of DMSO and water, said solution containing cellulose in dimethylsulphoxide (DMSO) and formaldehyde at a formaldehyde/cellulose weight ratio of about 0.2 to 2 and at a cellulose concentration of at least 6% by weight based on the volume of DMSO.
Claim 3
Dependent Claim
10 words
Process of claim 1, wherein said shaped articles are films.
Claim 4
Dependent Claim
14 words
Process fo claim 1, wherein the cellulose has a DP of at least 400.
Claim 5
Dependent Claim
10 words
Process of claim 3, wherein said shaped articles are filaments.
Claim 6
Dependent Claim
12 words
Process of claim 4, including the further step of drawing the filaments.
Claim 7
Dependent Claim
15 words
Process of claim 4, wherein said solution is extruded as filaments into said coagulant bath.
Claim 8
Dependent Claim
14 words
Process of claim 6, wherein said cellulose has a DP of 400 to 1,100.
Claim 9
Dependent Claim
14 words
Process of claim 6, wherein the cellulose concentration is 6 to 20% by weight.
Claim 10
Dependent Claim
19 words
Process of claim 8, wherein the extruded filaments are coagulated in said coagulant bath in less than 20 seconds.
Claim 11
Dependent Claim
10 words
Process of claim 1, wherein said shaped articles are membranes.
Claim 12
Dependent Claim
108 words
Process for producing shaped articles of cellulose, said process comprising shaping a solution containing cellulose in dimethylsulphoxide (DMSO) and formaldehyde at a formaldehyde/cellulose weight ratio of about 0.2 to 2 and at a cellulose concentration of at least 6% by weight based on the volume of DMSO into a coagulant bath containing water, DMSO and ammonia or an ammonium salt, the DMSO present in an amount of about 25 to 60 weight percent, based on the amount of DMSO and water, and the ammonia or ammonium salt present in an amount, calculated as ammonia, of at least 1 gram per liter of the mixture of DMSO and water.
Claim 13
Dependent Claim
108 words
Process for producing shaped articles of cellulose, said process comprising shaping a solution containing cellulose in dimethylsulphoxide (DMSO) and formaldehyde at a formaldehyde/cellulose weight ratio of about 0.2 to 2 and at a cellulose concentration of at least 6% by weight based on the volume of DMSO into a coagulant bath containing water, DMSO and ammonia or an ammonium salt, the DMSO present in an amount of about 25 to 60 weight percent, based on the amount of DMSO and water, and the ammonia or ammonium salt present in an amount, calculated as ammonia, of at least 1 gram per liter of the mixture of DMSO and water.
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) | 1982-11-05 | 1983-05-07 | 1983-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-05 | 1987-05-07 | 1987-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-05 | 1991-05-07 | 1991-11-06 | $7700.00 | Window Closed / Lapsed |