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    31.
    发明专利
    未知

    公开(公告)号：DE3919839A1

    公开(公告)日：1990-12-20

    申请号：DE3919839

    申请日：1989-06-17

    Applicant: HOECHST AG

    Inventor： ESCHER CLAUS DR ,  DUEBAL HANS-ROLF DR ,  HARADA TAKAMASA ,  ILLIAN GERHARD DR ,  MURAKAMI MIKIO ,  OHLENDORF DIETER DR

    IPC: C09K19/42 ,  G02F1/137 ,  G02F1/141

    Abstract: The liquid-crystal element described consists of a housing with transparent discs and electrodes, polarisation foils, orientation films, plus a smectic ferro-electric liquid-crystalline material. This FLC material is dielectrically positive (i.e. DELTA epsilon >0), with the result that the liquid-crystal element has a high contrast and, in addition, is switchable even when high voltages (e.g. greater than 15 V) are applied. Unlike LC elements with dielectrically negative material, no change in surface texture occurs under such conditions. The increase in the effective cone angle produced by applying an electric field to the element described above can also be used to produce so-called grey shades.

    34.
    发明专利
    未知

    公开(公告)号：DE59107399D1

    公开(公告)日：1996-03-28

    申请号：DE59107399

    申请日：1991-04-10

    Applicant: HOECHST AG

    Inventor： HARADA TAKAMASA ,  ROESCH NORBERT DR ,  WEGENER PETER DR

    IPC: C09K19/06 ,  C09K19/30 ,  C09K19/32 ,  C09K19/34 ,  C09K19/40 ,  C09K19/54 ,  C09K19/56 ,  C09K19/58 ,  G02F1/13 ,  G02F1/137

    Abstract: A liquid-crystal mixture comprising at least two components and containing, as one component, a macrocyclic compound of the formula (1) … … where a, b, c, d, e and f, independently of one another, are an integer from zero to 4, where a+b+c+d+e+f is >/= 7, and -A-, -B-, -C-, -D-, -E- and -F- are identical or different and are, for example, -CH2-, -CH=CH-, -CO- or -COO-,… results, in FLC displays, in the formation of uniform alignment and in the avoidance of twist states, which is expressed in significantly improved contrast.

    36.
    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.

    38.
    发明专利
    未知

    公开(公告)号：AT116676T

    公开(公告)日：1995-01-15

    申请号：AT91105700

    申请日：1991-04-10

    Applicant: HOECHST AG

    Inventor： HARADA TAKAMASA ,  ROESCH NORBERT DR ,  WINGEN RAINER DR

    IPC: C09K19/54 ,  C09K19/58 ,  G02F1/137

    Abstract: The occurrence of twist states in FLC displays can be suppressed by adding ionophores to FLC mixtures. Applicable ionophores are amides of the general formula I (I) wherein R1, R2, R3 and R4 e.g. are alkyl, cyclohexyl, phenyl or benzyl and X is alkylene with -CH2-groups being replaced by -O-, 1,2-phenylene or 1,2-cyclohexylene.

    40.
    发明专利
    未知

    公开(公告)号：DE59006153D1

    公开(公告)日：1994-07-21

    申请号：DE59006153

    申请日：1990-03-21

    Applicant: HOECHST AG

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

    IPC: G02F1/13 ,  C09K19/34 ,  C09K19/42 ,  C09K19/46 ,  C09K19/58

    Abstract: PCT No. PCT/EP90/00458 Sec. 371 Date Nov. 6, 1991 Sec. 102(e) Date Nov. 6, 1991 PCT Filed Mar. 21, 1990 PCT Pub. No. WO90/11336 PCT Pub. Date Oct. 4, 1990.The novel liquid-crystalline mixtures (in the case of ferroelectric behavior they additionally contain an optically active compound as dope) are based on at least two mixture components of the general formula (I) and at least one carboxylate of the general formula (II), (III) or (IV). (* CHEMICAL STRUCTURE *) (I) (* CHEMICAL STRUCTURE *) (II) X = O or a single bond (* CHEMICAL STRUCTURE *) (III) (* CHEMICAL STRUCTURE *) (IV) The mixtures have favorable properties for use in electrooptical display elements, such as high contrast, low melting point and short switching times.

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