The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 2004
Filed:
Dec. 11, 2001
Frank Prechtl, Frankfurt, DE;
Sylke Haremza, Neckargemünd, DE;
Robert Parker, Mannheim, DE;
Kathrin Kürschner, Mannheim, DE;
Manfred Braun, Schifferstadt, DE;
Antje Hahn, Düsseldorf, DE;
Ralf Fleischer, Houston, TX (US);
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Improved liquid crystalline materials may be prepared by doping liquid crystalline materials with chiral, uncharged metal compounds of formula [(P —Y —A —Y —M —Y —) L] Me or [(P —Y —A —Y —M —Y —) L]Me(L′(—Y —M —Y —A —Y —P ) ) . Groups P and P may be, independently, hydrogen, C -C -alkyl groups, polymerizable groups, or radicals containing a polymerizable group. Y to Y may be, independently, single chemical bonds, ether groups, thio groups, carbonyl groups, acid groups, etc. Groups A and A are spacers having from 1 to 30 carbon atoms, and M and M are mesogenic groups. Me may be a transition metal from the fourth, fifth or sixth period of the periodic table, except for technetium, silver, cadmium, gold, mercury, or any of the lanthanoids, or Me may be a main group element from group 14 (IUPAC system), except for carbon and lead. L is a tridentate ligand, and L′ is an organic group having up to 12 carbon atoms.