Process for producing cellulosic shaped articles
US4173613A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 14, 1977 |
| Grant date | Nov 6, 1979 |
| Priority date | — |
| Expiry date | Jul 14, 1997 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F2/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.