公开(公告)号：NO911434D0

公开(公告)日：1991-04-11

申请号：NO911434

申请日：1991-04-11

Applicant: HOECHST AG

Inventor： HARADA TAKAMASA ,  ROESCH NORBERT ,  WINGEN RAINER

IPC: C09K19/54 ,  C09K19/58 ,  G02F1/137 ,  C09K

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.

公开(公告)号：FI911719A0

公开(公告)日：1991-04-10

申请号：FI911719

申请日：1991-04-10

Applicant: HOECHST AG

Inventor： HARADA TAKAMASA ,  ROESCH NORBERT ,  WINGEN RAINER

IPC: C09K19/54 ,  C09K19/58 ,  G02F1/137 ,  C09K

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.

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：NO902111L

公开(公告)日：1990-11-14

申请号：NO902111

申请日：1990-05-11

Applicant: HOECHST AG

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

IPC: G02F1/13 ,  C07C13/04 ,  C07C13/28 ,  C07C22/00 ,  C07C25/00 ,  C07C43/184 ,  C07C43/205 ,  C07C43/21 ,  C07C69/92 ,  C07C255/45 ,  C07D213/30 ,  C07D237/08 ,  C07D237/14 ,  C07D237/16 ,  C07D237/18 ,  C07D239/26 ,  C07D239/34 ,  C07D239/38 ,  C07D241/12 ,  C07D241/18 ,  C07D285/12 ,  C07D285/125 ,  C07D285/13 ,  C07D405/12 ,  C09K19/20 ,  C09K19/30 ,  C09K19/34

Abstract: The novel cyclopropylalkyl or -alkenyl compounds have the general formula In this formula, the symbols A , A , A denote unsubstituted and in particular substituted (by halogen or CN) aromatic or heteroaromatic molecular building blocks, such as 1,4-phenylene or pyrimidine-2,5- diyl, which are linked via a single bond or via functional groups M , M , such as CO-O or CH2-O; H and m are zero or 1; j, l, n are zero, 1 or 2. The radicals are R , R , R are H or alkyl/alkenyl, R is alkyl/alkenyl or a substituent known from LC chemistry, such as an alpha - haloalkanoic acid radical. G denotes alkylene or alkenylene.

公开(公告)号：CA2049314A1

公开(公告)日：1990-09-23

申请号：CA2049314

申请日：1990-03-21

Applicant: HOECHST AG

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

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

Abstract: - 45 - HOE 89/F 095 Liquid-crystalline mixtures in particular ferroelectric liquid-crystalline mixtures 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 formulae ¢sic! (II), (III) or (IV). (I) (II) X = O or a single bond (III) (IV) The mixtures have favorable properties for use in electrooptical display elements, such as high contrast, low melting point and short switching times.

公开(公告)号：PT97342B

公开(公告)日：1998-08-31

申请号：PT9734291

申请日：1991-04-11

Applicant: HOECHST AG

Inventor： ESCHER CLAUS ,  ILLIAN GERHARD ,  ROSCH NORBERT ,  HARADA TAKAMASA

IPC: C07D225/02 ,  C07D273/08 ,  C07D323/00 ,  G02F1/133 ,  C07D405/12 ,  C07D498/08 ,  C09K19/54 ,  C09K19/56 ,  G02F1/13 ,  G02F1/1337 ,  G02F1/137 ,  G02F1/141 ,  G09F9/35

Abstract: Addition of coronands and cryptands to FLC-mixtures makes it possible to bring the FLC material into a homogeneous "bookshelf" or "quasi-bookshelf" geometry. When such a FLC mixture is used, displays which have been shock-damaged can be regenerated by applying a suitable electric field for a short period of time.

公开(公告)号：DE69123965T2

公开(公告)日：1997-07-17

申请号：DE69123965

申请日：1991-06-14

Applicant: HOECHST AG

Inventor： HARADA TAKAMASA ,  ESCHER CLAUS ,  ILLIAN GERHARD ,  OHLENDORF DIETER ,  RIEGER HEINZ ,  ROESCH NORBERT

IPC: C09K19/54 ,  C09K19/58 ,  G02F1/13 ,  G02F1/1339 ,  G02F1/1341 ,  C09K19/52

Abstract: A process for producing a liquid-crystal cell by using a ferroelectric liquid crystal (FLC) composition containing at least one oleophilic substance that exhibits liquid crystallinity and at least one additive having lower boiling point than said substance, characterized in that said FLC composition is charged into the cell under high-temperature and high-vacuum conditions, provided that the two conditions will not overlap, or will overlap for a sufficiently short time to effectively prevent the evaporation of said additive.

公开(公告)号：DE69123965D1

公开(公告)日：1997-02-13

申请号：DE69123965

申请日：1991-06-14

Applicant: HOECHST AG

Inventor： HARADA TAKAMASA ,  ESCHER CLAUS ,  ILLIAN GERHARD ,  OHLENDORF DIETER ,  RIEGER HEINZ ,  ROESCH NORBERT

IPC: C09K19/54 ,  C09K19/58 ,  G02F1/13 ,  G02F1/1339 ,  G02F1/1341 ,  C09K19/52

Abstract: A process for producing a liquid-crystal cell by using a ferroelectric liquid crystal (FLC) composition containing at least one oleophilic substance that exhibits liquid crystallinity and at least one additive having lower boiling point than said substance, characterized in that said FLC composition is charged into the cell under high-temperature and high-vacuum conditions, provided that the two conditions will not overlap, or will overlap for a sufficiently short time to effectively prevent the evaporation of said additive.

公开(公告)号：DE59009245D1

公开(公告)日：1995-07-20

申请号：DE59009245

申请日：1990-03-21

Applicant: HOECHST AG

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

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

Abstract: Ferroelectric liquid-crystal systems having high spontaneous polarization, in particular >35 nC cm-2, and good orientation properties in the ferroelectric phase, in particular the SC* phase, contain at least three different optically active compounds, preferably as dopes in a base mixture which is not itself optically active and has a nematic phase above the smectic phase. The optically active compounds are selected so that they do not all induce a helix of the same rotation sense in the nematic phase. Their relative concentrations are selected so that the total resultant pitch of the helix throughout the cholesteric phase is not less than 10 mu m.