Electrooptical liquid crystal system
US6187222A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2000 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Feb 18, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/057
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An electroptical system PA1 which between 2 electrode layers contains a PDLC film comprising a liquid crystal mixture forming micro-droplets in an optically isotropic, transparent polymer matrix, PA1 in which one of the refractive indices of the liquid crystal mixture is matched to the refractive index of the polymer matrix, PA1 which exhibits an electrically switchable transparency essentially independent of the polarization of the incident light, PA1 the precursor of the PDLC film of which comprises one or more monomers, oligomers and/or prepolymers and a photoinitiator, and is cured photoradically, PA1 the liquid crystal mixture of which comprises one or more compounds of the formula I ##STR1## in which the substituents are defined herein characterized in that the liquid crystal mixture additionally contains one or more reactive liquid crystalline compounds in order to obtain improved switching times especially at low temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.