Phenyl Benzoate Derivative Patents (Class 252/299.67)
  • Ferroelectric liquid crystal mixture
    Patent number: 6171519
    Abstract: A ferroelectric liquid crystal mixture having a negative value of &Dgr;e and allowing a high speed response and a low voltage driving, as well as a liquid crystal display devise using the crystal mixture of the invention. The ferroelectric liquid crystal mixture according to the invention comprises two or more compounds from at least two different of the following classes of compounds: A. thiadiazoles, B. phenanthrenes, C. 2-fluoropyridines, D. difluorobenzenes, E. meta-substituted aromatic compounds.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: January 9, 2001
    Assignee: Hoechst Research & Technology Deutschland GmbH & Co. KG
    Inventors: Toshiaki Nonaka, Ayako Takeichi, Li Ji, Kazuya Nagao, Rainer Wingen, Javier Manero, Barbara Hornung, Wolfgang Schmidt
  • Method of preparing a cross-linked macroscopically oriented polymer
    Patent number: 6171518
    Abstract: The invention relates to a method of preparing an oriented cross-linked polymer, which comprises the steps of orienting and polymerizing a liquid-crystal composition. The liquid-crystal composition comprises a monomer which reduces the order during polymerization. This makes it possible to obtain oriented cross-linked polymers having a low degree of optical anisotropy and optical elements having a relatively low degree of scattering.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: January 9, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Rifat A. M. Hikmet, Johan Lub