Process of making fibers or films of regenerated cellulose
US5571468A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1995 |
| Grant date | Nov 5, 1996 |
| Priority date | — |
| Expiry date | Jun 6, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2965
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for producing a fiber or film of regenerated cellulose from a composition having a base of cellulose formate is provided. The composition is characterized by the following: (1) the composition is a solution; (2) the concentration of cellulose formate in the composition is at least 8% by weight; (3) the degree of substitution of the cellulose by formate groups is greater than 20% and (4) the composition contains one or more compounds selected from among alkylsulfoxides, lactams, acrylic amides and cyclic derivatives of urea as a solvent. The process for producing the fiber or film involves (i) transforming the composition into a liquid extrudate having the form of a fiber or film at a temperature at which the solution is isotropic at rest; (ii) coagulating the liquid extrudate; (iii) regenerating the cellulose of the fiber or film obtained and (iv) washing and drying the regenerated cellulose fiber or film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.