Polymer solutions
US4581072A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1984 |
| Grant date | Apr 8, 1986 |
| Priority date | — |
| Expiry date | Feb 8, 2004 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F2/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Shaped articles, such as fibres and films, are obtained from a polymer solution comprising cellulose, a solvent for the cellulose comprising a cyclic tertiary amine N-oxide and water, and a stabilizer for the solution selected from the group consisting of sodium hexametaphosphate, disodium hydrogen phosphate, potassium dihydrogen phosphate, hydroxy-ethylidene diphosphonic acid, aminoethyl diphosphonic acid, and complexes of such compounds with occluded metal ions present in the polymer solution. The stabilizer is present in an amount sufficient to stabilize the solution against thermal degradation which causes loss of solvent and discoloration of solvent and dissolved cellulose.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.