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    13.
    发明专利
    未知

    公开(公告)号：DE59009764D1

    公开(公告)日：1995-11-16

    申请号：DE59009764

    申请日：1990-07-31

    Applicant: HOECHST AG

    Inventor： ESCHER CLAUS DR ,  DUEBAL HANS-ROLF DR ,  FELDHUES MICHAEL DR ,  HARADA TAKAMASA ,  ILLIAN GERHARD DR ,  MECKLENBURG THOMAS DR ,  MURAKAMI MIKIO ,  OHLENDORF DIETER DR ,  PAMPUS KARL DR

    IPC: C08G61/12 ,  G02F1/1337 ,  G02F1/141 ,  G09F9/35

    Abstract: Switching and display elements based on ferroelectric liquid-crystals often exhibit a pronounced optical hysteresis which results in the appearance of so-called ghost images. This phenomenon can be markedly reduced or even suppressed if at least one of the two orienting layers are in direct contact with the electrodes and is composed of an electrically conductive polymer of the formula (I): (I) in which R1, R2=independently of each other, H, or straight-chain or branched alkyl or alkoxy containing 1-16 carbon atoms, or halogen, X=S, NH, Y-=BF4-, PF6-, PO43-, AsF6-, SbCl6-, SO42-, HSO4-, alkyl-SO3-, perfluoroalkyl-SO3-, aryl-SO3, F- or Cl-, and n is an integer from 4 to 100 and m is an integer from 1 to 30.

    19.
    发明专利
    未知

    公开(公告)号：DE4001965A1

    公开(公告)日：1991-07-25

    申请号：DE4001965

    申请日：1990-01-24

    Applicant: HOECHST AG

    Inventor： SCHEROWSKY GUENTER PROF DR ,  GAY JUERGEN DIPL CHEM ,  ESCHER CLAUS DR ,  WINGEN RAINER DR

    IPC: C07C69/63 ,  C07C69/773 ,  C07C69/90 ,  C07C255/19 ,  C07D213/30 ,  C07D237/08 ,  C07D239/26 ,  C07D239/34 ,  C07D241/12 ,  C07D285/12 ,  C07D319/06 ,  C09K19/12 ,  C09K19/20 ,  C09K19/30 ,  C09K19/34 ,  G02F1/13

    Abstract: Esters of 2-methylalkanecarboxylic acids which are substituted in the 3-position and of mesogenic alcohols, of the general formula (I) in which: R is, for example, straight-chain or branched alkyl having 1 to 14 C atoms (with or without asymmetric C atom), A , A and A are identical or different and are, for example, 1,4-phenylene in which one or two H atoms can be replaced by F, Cl and/or CN, or trans-1,4-cyclohexylene or pyrimidine-2,5-diyl, M and M are identical or different and are CO-O, O-CO, CH2-O, O-CH2, C IDENTICAL C, CH=CH or CH2-CH2, X is F, Cl or CN, R is straight-chain or branched alkyl having from 1 to 10 C atoms or cycloalkyl having 5 to 8 C atoms, and a is 1, and b, c, d and e are zero or 1 with the proviso that c + e equals 1 or 2, are distinguished by a high stability of their mesophases to UV irradiation and heating. They can be employed advantageously as doping agents in liquid-crystalline mixtures.

    20.
    发明专利
    未知

    公开(公告)号：DE3925971A1

    公开(公告)日：1991-02-07

    申请号：DE3925971

    申请日：1989-08-05

    Applicant: HOECHST AG

    Inventor： ESCHER CLAUS DR ,  DUEBAL HANS-ROLF DR ,  HARADA TAKAMASA ,  HEMMERLING WOLFGANG DR ,  ILLIAN GERHARD DR ,  MUELLER INGRID DR ,  MURAKAMI MIKIO ,  OHLENDORF DIETER DR ,  WEGENER PETER DR ,  WINGEN RAINER DR

    IPC: C09K19/20 ,  C09K19/34 ,  C09K19/46

    Abstract: The novel liquid crystalline mixtures, which additionally contain an optically active compound as a dopant in the case of ferroelectric behaviour are based on at least 2 components of the general formula (I) and at least one carboxylic ester of the general formula (XI) or (XII) in which x is an integer of from 2 to 14 and n is an integer of from 6 to 14 in which a and b independently of one another may denote an integer of from 2 to 14 and -X- may denote an or an -O- group; in which A denotes, for example, pyrimidine-2,5-diyl, -Y- denotes, for example, -O- or -S-, -M- denotes, for example, -O- or -CH2-, -R denotes, for example, CH3 and c, d and e denote, for example, integers such as 2, 3 or 4. The mixtures, which may also contain further components, have advantageous properties for use in electrooptical display elements, such as low melting points and low crystallisation temperatures.

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