Polycarbonate film for optical purposes and a production process thereof
US5478518A · kind A · utility
13Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1994 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | Mar 18, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133305
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention is to provide a polycarbonate film excellent in optical properties such as high transparency and a process for producing it. The present invention relates to a polycarbonate film having a specific retardation value, and a process for producing a polycarbonate film by casting a dope onto a support and evaporating the solvent with heat wherein the dope is prepared by dissolving 10 parts by weight of polycarbonate resin in 30 to 150 parts by weight of the solvent mixture which contains more than 60% by weight of dioxolane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.