公开(公告)号：ES2056855T3

公开(公告)日：1994-10-16

申请号：ES88108381

申请日：1988-05-26

Applicant: HOECHST AG

Inventor： SCHEROWSKY GUNTER PROF DR ,  GAY JURGEN ,  DUBAL HANS-ROLF DR ,  ESCHER CLAUS DR ,  HEMMERLING WOLFGANG DR ,  MULLER INGRID DR ,  OHLENDORF DIETER DR ,  WINGEN RAINER DR

IPC: C07D301/30 ,  C07D303/48 ,  C07D405/06 ,  C07D405/12 ,  C07D407/12 ,  C07D409/12 ,  C09K19/58 ,  G02F1/139 ,  G02F1/361 ,  G02F1/37

Abstract: Optically active oxirane-2-carboxylic esters with a mesogenic moiety are suitable for use as dopants in liquid crystal mixtures. They lead to liquid-crystalline ferroelectric phases having short response times and to electroclinic phases having large electroclinic coefficients. A further advantage is that they induce a helix of very small pitch, so that they are also suitable for helix compensation in LC mixtures.

公开(公告)号：DE58906540D1

公开(公告)日：1994-02-10

申请号：DE58906540

申请日：1989-07-15

Applicant: HOECHST AG

Inventor： SCHEROWSKY GUENTER PROF ,  GAY JUERGEN ,  WINGEN RAINER DR ,  DUEBAL HANS-ROLF DR ,  ESCHER CLAUS DR ,  HEMMERLING WOLFGANG DR ,  INOGUCHI YOSHIO DR ,  MUELLER INGRID DR ,  OHLENDORF DIETER DR

IPC: G02F1/13 ,  C07D317/22 ,  C07D317/24 ,  C07D317/36 ,  C07D317/72 ,  C07D405/12 ,  C07D405/14 ,  C07D407/12 ,  C07D409/12 ,  C07D409/14 ,  C07D417/12 ,  C07D417/14 ,  C09K19/34 ,  C09K19/54 ,  C09K19/58 ,  G02F1/137 ,  G02F1/33

Abstract: Optically active 1,3-dioxolane derivates of the general formula which carry a mesogenic radical in the 4-position are suitable as dopes in - in particular ferroelectric - liquid-crystal mixtures. The symbols in the general formula have the following meanings: R has a structure analogous to the moiety of the general formula on the right of X or is an alkyl or alkylene radical, which may be substituted, R , R and R are H or alkyl (R is alternatively alkenyl), which may also be substituted [R and R , together with the C(2) of the dioxolane ring, may alternatively be cycloaliphatic or keto groups], j, l and n are zero, 1 or 2, and k and m are zero or 1, with the proviso that n is zero if k is zero, m is zero if n is zero, and 1 , -A and -A are an aromatic, heterocyclic or aliphatic ring system, -M and -M are -CO-O, -O-CO, -CH2CH2, -CH=CH, -CH2O, -OCH2 or -C IDENTICAL C and X is O, S or O-CO-O. The particular advantage of the compounds of the general formula (I) is that they are able to induce a high twisting power in the cholesteric phase, but without significantly affecting the magnitude of the spontaneous polarisation already present in the mixture in the smectic C phase. They are therefore suitable for pitch compensation, in particular for ferroelectric liquid-crystal mixtures.

公开(公告)号：AT99299T

公开(公告)日：1994-01-15

申请号：AT89117264

申请日：1989-09-19

Applicant: HOECHST AG

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

IPC: C07D303/48 ,  C07D317/32 ,  C07D317/34 ,  C07D317/72 ,  C07D405/12 ,  C07D405/14 ,  C07D407/12 ,  C07D407/14 ,  C07D409/12 ,  C07D409/14 ,  C07D417/12 ,  C07D417/14 ,  C09K19/34 ,  C09K19/58

公开(公告)号：DE4023027A1

公开(公告)日：1992-01-23

申请号：DE4023027

申请日：1990-07-20

Applicant: HOECHST AG

Inventor： BLATTER KARSTEN DR ,  ESCHER CLAUS DR ,  HARADA TAKAMASA ,  HARNISCHFEGER PETER DR ,  HEMMERLING WOLFGANG DR

IPC: C07D405/12 ,  C09K19/34 ,  C09K19/58 ,  G02F1/13

Abstract: Compounds have general formula (I), in which the symbols have the following meaning: R is a straight or branched chain (C3-C12)alkenyl with a terminal double bond, whereas one or two non adjacent CH2 groups may be substituted with O and/or S atoms; A, B represent independently from each other phenyl, diazin-2,5-diyl or diazin-3,6-diyl, provided that one of the groups A or B is phenyl and the other is diazin; X is O or S; R , R , R represent independently from each other H, straight chain (C1-C10)alkyl or branched chain (C3-C10)alkyl, whereas R , R and R are not all H at the same time. These compounds have the property of increasing the phase width in CC- mixtures or of reducing their melting point.

公开(公告)号：DE3925970A1

公开(公告)日：1991-02-07

申请号：DE3925970

申请日：1989-08-05

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.

公开(公告)号：DE3920625A1

公开(公告)日：1991-01-03

申请号：DE3920625

申请日：1989-06-23

Applicant: HOECHST AG

Inventor： ESCHER CLAUS DR ,  HEMMERLING WOLFGANG DR ,  ILLIAN GERHARD DR ,  HARADA TAKAMASA ,  MURAKAMI MIKIO

IPC: G02F1/1337 ,  C09K19/02 ,  C09K19/34 ,  C09K19/58 ,  G02F1/137 ,  G02F1/141

Abstract: Liquid-crystalline materials are becoming increasingly important in electrooptical switching and display devices. Recently, ferroelectric liquid-crystalline mixtures have also been investigated widely and employed in displays. A particularly important physical parameter for describing FLC mixtures is the spontaneous polarisation (Ps). On the one hand, a high spontaneous polarisation results in short response times, but on the other hand, high Ps values result in optical hysteresis, which causes, inter alia, so-called "ghost images". The use of FLC mixtures of high spontaneous polarisation (Ps 20 nC/cm ) and a natural helical pitch of less than half the layer thickness in an SSFLC display having a layer thickness of from 1 to 10 mu m allows the problem of optical hysteresis to be circumvented, in spite of the high spontaneous polarisation. FLC mixtures in which Ps is > 40 nC/cm can also be switched under these conditions.

公开(公告)号：DE3861049D1

公开(公告)日：1990-12-20

申请号：DE3861049

申请日：1988-04-12

Applicant: HOECHST AG

Inventor： WINGEN RAINER DR ,  DUEBAL HANS-ROLF DR ,  ESCHER CLAUS DR ,  HEMMERLING WOLFGANG DR ,  MUELLER INGRID DR ,  OHLENDORF DIETER DR

IPC: C07D317/24 ,  C07D317/32 ,  C07D317/72 ,  C07D405/12 ,  C07D407/12 ,  C07D409/12 ,  C09K19/02 ,  C09K19/34 ,  C09K19/54 ,  C09K19/58 ,  G02F1/133 ,  G02F1/137 ,  G02F1/141

Abstract: Optically active and mesogenic 1,3-dioxolane-4-carboxylic esters are suitable for use as dopants in liquid crystal mixtures. They lead to liquid-crystalline ferroelectric phases having short response times and to electroclinic phases having large electroclinic coefficients. Their particular advantage is that they induce a helix of very large pitch, so that there is no need for any helix compensation by other dopants. Moreover, the 1,3-dioxolane-4-carboxylic esters exhibit high UV stability.

公开(公告)号：DE3731638A1

公开(公告)日：1989-04-27

申请号：DE3731638

申请日：1987-09-19

Applicant: HOECHST AG

Inventor： WINGEN RAINER DR ,  DUEBAL HANS-ROLF DR ,  ESCHER CLAUS DR ,  HEMMERLING WOLFGANG DR ,  MUELLER INGRID DR ,  OHLENDORF DIETER DR

IPC: C07D239/26 ,  C07D239/34 ,  C09K19/34

Abstract: The novel phenylpyrimidine derivatives of the formula where R is alkyl having 7 to 16 carbon atoms or alkoxy having 6 to 16 carbon atoms, and n is from 4 to 14, form Sc phases and cause a pronounced melting point depression in mixtures with one another or with structurally closely related phenylpyrimidine derivatives substituted to saturation. Neither are the properties affected by this.

公开(公告)号：DE3831226A1

公开(公告)日：1989-03-30

申请号：DE3831226

申请日：1988-09-14

Applicant: HOECHST AG

Inventor： DUEBAL HANS-ROLF DR ,  ESCHER CLAUS DR ,  HEMMERLING WOLFGANG DR ,  MUELLER INGRID DR ,  OHLENDORF DIETER DR ,  WINGEN RAINER DR

IPC: C09K19/42 ,  C09K19/34 ,  C09K19/46 ,  C09K19/58 ,  G02F1/137 ,  G02F1/141

Abstract: The novel liquid-crystalline mixtures, which, in the case of ferroelectric behaviour, additionally contain an optically active compound as dope (dopant), are based on at least two mixture components of the formula (I): where n = 6 to 14 and x = 2 to 14. In addition, the mixtures can also contain cyclohexanecarboxylic esters of the formula (II) where R = (C10-C16)alkyl or (C8-C14)alkoxy, and R = (C2-C 9)alkyl, alkenyloxyphenylpyrimidine derivatives of the formula (III) where R = (C7-C16)alkyl or (C6-C14)alkoxy and y = 4-14, and/or alkylpyrimidinealkoxyphenyl derivatives of the formula (IV) where m and p = 6 to 14.m

公开(公告)号：DE3731639A1

公开(公告)日：1989-03-30

申请号：DE3731639

申请日：1987-09-19

Applicant: HOECHST AG

Inventor： WINGEN RAINER DR ,  DUEBAL HANS-ROLF DR ,  ESCHER CLAUS DR ,  HEMMERLING WOLFGANG DR ,  MUELLER INGRID DR ,  OHLENDORF DIETER DR

IPC: C07D239/26 ,  C07D239/34 ,  C09K19/34 ,  C09K19/46 ,  G02F1/137 ,  G02F1/141

Abstract: Phenylpyrimidinyl trans-cyclohexanecarboxylates of the formula … … form, in addition to a relatively broad nematic phase, a smectic C phase if R denotes an alkyl radical having 10 to 16 carbon atoms, in particular 11 to 16 carbon atoms, or an alkyloxy radical having 8 to 14 carbon atoms and R denotes an alkyl radical having 2 to 9 carbon atoms. Accordingly, they are suitable in particular as components of liquid-crystalline mixtures having a smectic C phase, since they induce a relatively broad nematic phase or widen a narrow nematic phase present and enlarge the temperature range of the smectic C phase towards low, but in particular towards high temperatures.