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:
Jun. 10, 1997
Filed:
Jan. 28, 1991
Stephen Kelly, Mohlin, CH;
Martin Schadt, Seltisberg, CH;
Rolic AG, Basel, CH;
Abstract
Chiral dopants of the formula ##STR1## in which n represents the number 0 or 1; R.sup.3 denotes a group of the general formula ##STR2## A.sup.1, A.sup.2 and A.sup.3, independently of one another, represent 1,4-phenylene which is unsubstituted or substituted by halogen, cyano and/or methyl and in which 1 or 2 CH groups may be replaced by nitrogen, or represent trans-1,4-cyclohexylene, trans-1,3-dioxane-2,5-diyl or naphthalene-2,6-diyl, and ring A.sup.2 additionally represents 1,4-biphenylene; Z.sup.1 and Z.sup.4, independently of one another, denote a single covalent bond or --CH.sub.2 CH.sub.2 --; Z.sup.2 and Z.sup.3, independently of one another, denote a single covalent bond, --CH.sub.2 CH.sub.2 --, --COO--, --OOC--, --CH.sub.2 O--, --OCH.sub.2 --, --C.tbd.C--, --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.3 O--, --O(CH.sub.2).sub.3 -- or the trans-form of --CH.dbd.CH--CH.sub.2 CH.sub.2 --, --CH.sub.2 CH.sub.2 --CH.dbd.CH--, --CH.dbd.CH--CH.sub.2 --O-- or --O--CH.sub.2 --CH.dbd.CH--; with the proviso that, if R.sup.3 denotes a group of the formula II, at least one of the groups Z.sup.2 and Z.sup.3 denotes --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.3 --O--, --O--(CH.sub.2).sub.3 -- or the trans-form of --CH.dbd.CH--CH.sub.2 --CH.sub.2 --, --CH.sub.2 --CH.sub.2 --CH.dbd.CH--, --CH.dbd.CH--CH.sub.2 --O-- or --O--CH.sub.2 --CH.dbd.CH--; R.sup.1, R.sup.5 and R.sup.6 denote hydrogen, alkyl, phenyl or alkoxycarbonyl; R.sup.2 denotes alkyl, phenyl or alkoxycarbonyl; R.sup.4 denotes halogen, cyano, trifluoromethyl, trifluoromethoxy or alkyl in which one --CH.sub.2 --CH.sub.2 -- may be replaced by --CH.dbd.CH-- and/or one or two non-adjacent methylene groups may be replaced by --O--, --COO-- and/or --OOC-- and/or one methylene group methylene group may be replaced by --CHX--; X denotes halogen, cyano or methyl; and the dioxolane ring shown in the formula I is in optically active form, liquid-crystalline mixtures which contain such dopants, and their use for optical and electrooptical purposes.