Cellulose ester film and its manufacturing method
US7399440B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2003 |
| Grant date | Jul 15, 2008 |
| Priority date | — |
| Expiry date | Nov 8, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2301/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is a cellulose ester film having a dry thickness of 20 to 60 μm, wherein the cellulose ester film is manufactured according to a solution cast film manufacture process comprising the steps of providing a cellulose ester dope, casting the cellulose ester dope on a support to form a cellulose ester web, peeling the cellulose ester web at a peel position from the support, transporting the peeled web to a dryer, drying the peeled web therein to form a cellulose ester film, and winding the cellulose ester film around a spool, the residual solvent content at the winding step of the cellulose ester film being not more than 0.05% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.