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61.发明专利
公开(公告)号：CA2019652A1
公开(公告)日：1990-12-23
申请号：CA2019652
申请日：1990-06-22
Applicant: HOECHST AG
Inventor： ESCHER CLAUS , HEMMERLING WOLFGANG , ILLIAN GERHARD , HARADA TAKAMASA , MURAKAMI MIKIO
Abstract: HOE 89/F 197 Ferroelectric liquid crystal components having a high spontaneous polarization and a small helical pitch Liquid crystal materials are becoming increasingly important in electro-optical switching and display devices. During recent times, ferroelectric liquid crystal mixtures have also been investigated to a particularly great extent and used in displays. A physical quantity which is particularly important for the purpose of describing FLC mixtures is the spontaneous polarization (Ps). On the one hand, a high spontaneous polarization leads to short switching times, while on the other hand in the case of high Ps values an optical hysteresis occurs, which leads, inter alia, to so-called "ghost images". In spite of high spontaneous polarization, the problem of the optical hysteresis may be overcome by the use of FLC mixtures having a high spontaneous polarization (Ps 20 nC/cm2) and a natural helical pitch of less than one half of the layer thickness in an SSFLC display with a layer thickness of 1 to 10 .mu.m. FLC mixtures with Ps > 40 nC/cm2 can also be switched under these conditions.
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公开(公告)号：NO902111D0
公开(公告)日：1990-05-11
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 , C07D239/00
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.
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公开(公告)号：DE59108558D1
公开(公告)日：1997-04-03
申请号：DE59108558
申请日：1991-04-18
Applicant: HOECHST AG
Inventor： DUEBAL HANS-ROLF DR , HARADA TAKAMASA , RIEGER HEINZ DR , ROESCH NORBERT DR , WEGENER PETER DR
IPC: C09K19/00 , G02F1/13 , G02F1/133 , G02F1/1337
Abstract: The use of alignment layers containing compounds having an amphiphilising effect increases the contrast and/or brightness of the image in the FLC display.
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公开(公告)号：AT118808T
公开(公告)日：1995-03-15
申请号：AT91900771
申请日：1990-11-26
Applicant: HOECHST AG
Inventor： ESCHER CLAUS , HARADA TAKAMASA , ILLIAN GERHARD , ROESCH NORBERT , WINGEN RAINER
IPC: C09K20060101 , C09K19/02 , C09K19/34 , C09K19/52 , C09K19/58
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公开(公告)号：PT97342A
公开(公告)日：1993-05-31
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 , G02F1/133 , C07D323/00 , 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.
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Patent Agency Ranking
公开(公告)号：NO924720D0
公开(公告)日：1992-12-07
申请号：NO924720
申请日：1992-12-07
Applicant: HOECHST AG
Inventor： HARADA TAKAMASA , ESCHER CLAUS , ILLIAN GERHARD , OHLENDORF DIETER , RIEGLER HEINZ , ROESCH NORBERT
IPC: G02F20060101 , G02F1/1341 , G02F
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公开(公告)号：NO924720A
公开(公告)日：1992-12-07
申请号：NO924720
申请日：1992-12-07
Applicant: HOECHST AG
Inventor： HARADA TAKAMASA , ESCHER CLAUS , ILLIAN GERHARD , OHLENDORF DIETER , RIEGLER HEINZ , ROESCH NORBERT
IPC: G02F20060101 , G02F1/1341
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公开(公告)号：ZA909635B
公开(公告)日：1992-06-24
申请号：ZA909635
申请日：1990-11-30
Applicant: HOECHST AG
Inventor： ESCHER CLAUS , CLAUS ESCHER , ROESCH NORBERT , NORBERT ROESCH , HARADA TAKAMASA , TAKAMASA HARADA , WINGEN RAINER , RAINER WINGEN , ILLIAN GERHARD , GERHARD ILLIAN
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公开(公告)号：NO922135D0
公开(公告)日：1992-05-29
申请号：NO922135
申请日：1992-05-29
Applicant: HOECHST AG
Inventor： ESCHER CLAUS , HARADA TAKAMASA , ILLIAN GERHARD , ROESCH NORBERT , WINGEN RAINER
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公开(公告)号：FI922407A0
公开(公告)日：1992-05-26
申请号：FI922407
申请日：1992-05-26
Applicant: HOECHST AG
Inventor： ESCHER CLAUS , HARADA TAKAMASA , ILLIAN GERHARD , ROESCH NORBERT , WINGEN RAINER
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