Compositions – Liquid crystal compositions
Patent
1997-04-04
2000-10-31
Kelly, C. H.
Compositions
Liquid crystal compositions
2522996, 25229961, 252582, 25229963, 2522992, 544298, 544224, 544242, 546339, 568626, 568647, 570128, 570129, 570144, 585 25, C09K 1952, C09K 1906, C07D23902, C07C 1908
Patent
active
061397717
ABSTRACT:
This invention provides LC compositions useful as birefringent materials in electrooptic devices which exhibit zero or low negatively sloped birefringence dispersion (e.g., exhibiting positive birefringence dispersion significantly lower than that of currently available LC compositions) or more preferably positively sloped birefringence dispersion in which birefringence of the material increases with wavelength. The invention provides compounds useful as components of LC compositions which exhibit negative birefringence where n.sub.o is higher than n.sub.e. The compounds of this invention are dimers of LC-like compounds in which the monomers are linked to each other through a high birefringence moiety (dimerization linker). The LC monomers consist of an LC core and one or two tail groups. Preferred monomers for this invention have low birefringence in comparison to the birefrigence of the monomer linking moiety. The dimers have normal positive birefringence dispersion to have birefringence that is lower in absolute value at longer wavelengths. But since they have negative birefringence, their birefringence actually increases (i.e., goes less negative) as wavelength increases.
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Chen Xin Hua
Cobben Peter
Dyer Daniel J.
Muller Uwe
Thurmes William
Displaytech, Inc.
Kelly C. H.
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