Spinnable cellulose solution and process for making same
US4129451A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1977 |
| Grant date | Dec 12, 1978 |
| Priority date | — |
| Expiry date | Jul 14, 1997 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F2/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Spinnable, shapable solutions of celluose are disclosed, wherein the solutions contain native cellulose in a mixture of dimethylsulphoxide (DMSO) and formaldehyde. The cellulose has a degree of polymerization (DP) of at least 400 and a concentration in the mixture of at least 6% by weight, based on the volume of DSMO. The formaldehyde/cellulose weight ratio is 0.2 to 2, and the solutions have a water content no greater than 5,000 ppm by weight. The solutions are obtained by dissolving the cellulose in a mixture of DMSO and formaldehyde, at a formaldehyde/cellulose weight ratio of at least 1, and thereafter the formaldehyde/cellulose weight ratio is reduced, if necessary, to the final level of about 0.2 to 2. The solutions can be converted into films, membranes, sponges, varnishes, paints, and especially into filaments, with the filaments being generally similar in properties to regenerated cellulose filaments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.