Regenerated cellulose film, functional film and preparation method therefor
US9834652B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2014 |
| Grant date | Dec 5, 2017 |
| Priority date | — |
| Expiry date | Aug 22, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2301/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to a regenerated cellulose film, a functional film and preparation method thereof. The method mainly comprises the following steps: (1) shaping a cellulose/ionic liquid solution by die extrusion, calendering and casting; (2) the shaped solution entering into a coagulation bath to form a cellulose gel film; (3) in coagulation and washing processes, stretching the cellulose gel film at least 1 time in the transverse direction and at least 1 time in the longitudinal direction; (4) in drying process, further applying tension to the stretched film in the transverse and longitudinal directions, and finally obtaining a regenerated cellulose film by rolling. An organic and/or an inorganic functional additive can be added into the cellulose/ionic liquid solution to obtain a regenerated cellulose functional film. The regenerated cellulose film and the functional film thereof obtained by the above method have well-balanced and relative high longitudinal and transverse tensile strengths, as well as good flatness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.