Process for producing shaped articles of cellulose
US4129640A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 14, 1977 |
| Grant date | Dec 12, 1978 |
| Priority date | — |
| Expiry date | Jul 14, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B16/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.degree. 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.