Optical film
US6210872A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2000 |
| Grant date | Apr 3, 2001 |
| Priority date | — |
| Expiry date | May 18, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/3016
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A novel optical film capable of readily vitrifying the tendency and state of liquid crystal alignment, excellent in the ability to retain the alignment state, and suitable for the application to optical elements. The film is produced from a liquid-crystal material containing as the essential ingredient a liquid-crystal polyester having structural units (A) and (B) as the essential unit, exhibiting a vitrified state at a temperature lower than the liquid-crystal transition point, and having a logarithmic viscosity number (.eta.) of 0.04-0.4 dl/g as measured at 30.degree. C. in a phenol/tetrachloroethane solvent (60/40 by weight), wherein each X represents independently O or C.dbd.O; each Y represents independently a group selected from among F, Cl, Br and 1-4C alkyls; and n is 0 or 1. ##STR1##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.