Liquid crystal element
US4939003A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 22, 1988 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Jan 22, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/057
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a liquid crystal element with an improved orientation layer and a coating composition for forming such an orientation layer. The orientation layer consists essentially of a polymer with a Mark-Houwink coefficient of not less than 0.85, the Mark-Houwink coefficient being represented by the formula [I]: EQU [.eta.]=K.multidot.M.sup..alpha. [I] wherein [.eta.] represents intrinsic viscosity of the polymer determined by solution viscosity measuring method, K represents a constant, M represents molecular weight of the polymer, and .alpha. represents the Mark-Houwink coefficient. The coating composition comprises a polyfumaric acid ester represented by the formula [I]: ##STR1## wherein R.sup.1 and R.sup.2, are the same or different and each represents a straight or branched alkyl group, cycloalkyl group, haloalkyl group, silalkyl group or siloxanylalkyl group; and a halogen-containing organic solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.