Compositions – Liquid crystal compositions
Patent
1988-11-28
1990-05-15
Schofer, Joseph L.
Compositions
Liquid crystal compositions
526312, 526313, 428 1, 560 73, C08F 2602, C09K 1952
Patent
active
049255894
ABSTRACT:
Polymers having a monomeric unit of the formula ##STR1## wherein R.sup.1 represents hydrogen, methyl, ethyl, fluorine, chlorine, bromine, cyano or phenyl; X.sup.1 denotes oxygen, sulfur, --NH-- or --N(CH.sub.3)--; R.sup.2 is alkylene with 3-15 carbon atoms in which optionally a non-terminal methylene group is replaced by oxygen or sulfur; X.sup.2 denotes a single covalent bond, oxygen or sulfur; rings A and B each independently represent 1,4-phenylene which is unsubstituted or substituted with halogen, methyl, methoxy and/or cyano and in which optionally one CH group or two CH groups is/are replaced by nitrogen; ring C represents 1,4-phenylene which is unsubstituted or substituted with halogen, methyl, methoxy and/or cyano and in which optionally one CH group or two CH groups is/are replaced by nitrogen or represents trans-1,4-cyclohexylene; n stands for the number 0 and Z.sup.1 stands for --CONH-- or --NHCO--; or n stands for the number 1, one of the groups Z.sup.1 and Z.sup.2 represents --CONH-- or --NHCO-- and the other of the groups Z.sup.1 and Z.sup.2 denotes a single covalent bond, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O.sub.3 --, --OCH.sub.2 --, --N.dbd.N--, --CONH-- or --NHCO--; and R.sup.3 is hydrogen, halogen, cyano, nitro or an alkyl group in which optionally one methylene group or two non-adjacent methylene groups is/are replaced by oxygen and/or sulfur,
as well as their preparation and their use in optics and for the separation of mixtures of substances.
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Gould George M.
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Johnston George W.
Leon Bernard S.
McDonald, Jr. T.
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