Polycarbonate film for optical purposes and a production process thereof
US5561180A · kind A · utility
10Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 1995 |
| Grant date | Oct 1, 1996 |
| Priority date | — |
| Expiry date | May 16, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133305
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention is to provide polycarbonate film excellent in optical properties such as high transparency and a process for producing it. The present invention relates to polycarbonate film having a specific retardation values, and a process for producing 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.