中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

83 records (took 0.022 seconds)

    22.
    发明专利
    未知

    公开(公告)号：DE3917472A1

    公开(公告)日：1990-12-06

    申请号：DE3917472

    申请日：1989-05-30

    Applicant: HOECHST AG

    Inventor： DUEBAL HANS-ROLF DR ,  ESCHER CLAUS DR ,  ILLIAN GERD DR ,  MURAKAMI MIKIO ,  OHLENDORF DIETER DR

    IPC: G02F1/1333 ,  G02F1/1335 ,  G02F1/1362 ,  G02F1/137 ,  G02F1/141

    Abstract: PCT No. PCT/EP90/00761 Sec. 371 Date Nov. 27, 1991 Sec. 102(e) Date Nov. 27, 1991 PCT Filed May 11, 1990 PCT Pub. No. WO90/15360 PCT Pub. Date Dec. 13, 1990.A ferroelectric liquid crystal switching or display device, in which the liquid crystal film has a constant thickness, wherein one of the glass sheets in the device is planar and the other glass sheet has at least one step. The switching or display device of the present invention does not require shortened switching times or more contacts or drivers and does not show unwanted switching.

    24.
    发明专利
    未知

    公开(公告)号：DE3824902A1

    公开(公告)日：1990-02-15

    申请号：DE3824902

    申请日：1988-07-22

    Applicant: HOECHST AG

    Inventor： SCHEROWSKY G PROF DR ,  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.

    Chiral esters made from alpha -substituted carboxylic acids and mesogenic hydroxyl compounds, and the use thereof as dopes (dopants) in liquid-crystal phases
    27.
    发明专利
    Chiral esters made from alpha -substituted carboxylic acids and mesogenic hydroxyl compounds, and the use thereof as dopes (dopants) in liquid-crystal phases 未知

    公开(公告)号：DE3703228A1

    公开(公告)日：1988-08-18

    申请号：DE3703228

    申请日：1987-02-04

    Applicant: HOECHST AG

    Inventor： MUELLER INGRID DR ,  OHLENDORF DIETER DR ,  WINGEN RAINER DR

    IPC: C07C69/035 ,  C07D239/26 ,  C07D239/34 ,  C07D239/38 ,  C09K19/20 ,  C09K19/22 ,  C09K19/34 ,  C07C69/92 ,  C07D317/32 ,  C07D339/08 ,  G09F9/35

    Abstract: The novel compounds are chiral esters made from alpha -substituted carboxylic acids and mesogenic hydroxyl compounds which are characterised by the formula (I) in which the symbols have the following meanings: MO is the moiety of a mesogenic hydroxyl compound MOH after removal of an H, where the radical MO is expressed by the formula (II> R - (A )n1 - (B-)n2(A )n3 - O (II> where R is straight-chain or branched (C1-C12)alkyl or alkenyl, where one or two non-adjacent CH2 groups can be replaced by O and/or S atoms, or, if n1 = 1, is alternatively F, Cl, Br or CN, A and A , independently of one another, are 1,4-phenylene, pyrimidine-2,5-diyl, 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, 1,3-dithian-2,5-diyl or 1,4-bicyclo[2.2.2]octylene, where these groups may also be at least monosubstituted by F, Cl, Br, CN and/or (C1-C12)alkyl (one or two non-adjacent CH2 groups are optionally replaced by O and/or S atoms), B is CO-O, O-CO, CH2-CH2, OCH2, CH2O, CH = N, N = CH, N = N or N(O) = N, and n1, n2 and n3, independently of one another, are 0, 1 or 2, where n1 and n3 are not simultaneously 0, Y is F, Cl, Br, CN or CF3, and R is branched (C3-C9)alkyl, benzyl or phenyl, where the compounds where R = branched (C3-C7)alkyl, benzyl or phenyl, Y = F, Cl or Br, R = (C1-C11)alkoxy, A and A = phenyl, n1, n3 = 1 and n2 ... Original abstract incomplete.

Patent Agency Ranking