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    1.
    发明专利
    未知

    公开(公告)号：DE19549001A1

    公开(公告)日：1997-07-03

    申请号：DE19549001

    申请日：1995-12-28

    Applicant: HOECHST AG ,  GAMBRO DIALYSATOREN

    Inventor： BLATTER KARSTEN DR ,  WAGENER REINHARD DR ,  BELL CARL MARTIN DR ,  GOEHL HERMANN JOSEF

    IPC: B01D67/00 ,  B01D71/56 ,  C08G69/26 ,  C08G69/28 ,  C08G69/32 ,  C08G69/40 ,  D01F1/08 ,  D01F6/60 ,  D01F6/82 ,  C08G69/46 ,  C08G69/42 ,  D01D5/24 ,  B01D69/00

    Abstract: The production of polyether-amide (PEA) solutions comprises the polycondensation of dicarboxylic acid derivatives of formula Cl-C(O)-Ar-C(O)-Cl (I) with aromatic diamines of formula (II). In the formulae: Ar = arylene or heteroarylene in which the two carbonyl groups are not adjacent, i.e. not in the ortho position to one another, and the Ar groups may be substituted with one or two optionally branched 1-3C alkyl or alkoxy, aryl, aryloxy, 1-6C perfluoroalkyl or perfluoroalkoxy, F, Cl, Br and/or I groups; and X = -CMe2-, -C(CF3)2-, -CO-, -SO-, -SO2-, -CH2-, -S-, -O- or a direct bond. The reaction is carried out in aprotic polar solvents, optionally with up to 50 mole% of (II) replaced by m-phenylenediamine (m-PDA), and the solution obtained after polymerisation is treated with sufficient ammonia gas to neutralise the hydrochloric acid which is formed, and then filtered to remove the ammonium salt. Also claimed are: (i) semipermeable, porous, asymmetric membranes based on polyaramid; and (ii) the production of such membranes by precipitation from the above polycondensate solution with a precipitating liquid which is miscible with the solvent in the polymer solution.

    5.
    发明专利
    未知

    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.

    8.
    发明专利
    未知

    公开(公告)号：DE19629430A1

    公开(公告)日：1998-01-29

    申请号：DE19629430

    申请日：1996-07-22

    Applicant: HOECHST AG

    Inventor： SIMON PETER DR ,  BLATTER KARSTEN DR ,  HERMANN-SCHOENHERR OTTO DR ,  LERCH ALEXANDER DR ,  STOCK JOCHEN DR ,  LANGER JOERG

    IPC: C08G63/688 ,  C08G63/78 ,  C08G63/81 ,  C08G63/181 ,  C08G63/199 ,  C08G63/672 ,  C08L67/00 ,  D06M15/507

    Abstract: Disclosed is a method of preparing polyesters in powder form by means of polycondensation of dicarboxylic acid diol precondensates (oligomers) at elevated temperature in a heat transfer medium in the presence of polycondensation catalysts and optionally cocondensable modifiers. The liquid heat transfer medium is inert and free of aromatic components and has a boiling point in the range of 180 to 300 DEG C. The dicarboxylic acid diol precondensate contains on analytical average 1 to 30 mol % oligomer or monomer containing at least one sulfonic acid group. The weight ratio of dicarboxylic acid diol precondensate to liquid heat transfer medium is in the range of 20:80 to 80:20 and the polycondensation is carried out in the presence of a dispersion stabilizer, the resulting polyester being water-soluble.

    9.
    发明专利
    未知

    公开(公告)号：DE4435874A1

    公开(公告)日：1996-04-11

    申请号：DE4435874

    申请日：1994-10-07

    Applicant: HOECHST AG

    Inventor： HENZE ANDREE DR ,  BLATTER KARSTEN DR

    IPC: C08G69/32 ,  C08G69/28 ,  C08G85/00 ,  C08G69/46 ,  C08G73/10 ,  C08G73/14 ,  C08G73/18

    Abstract: The prodn. of polycondensates (I) comprises (i) dispersing a precondensate (A) contg. reactive terminal gps. in a high-boiling inert solvent (II); (ii) removing low-mol. wt. by-prods. by distn. at elevated temp.; (iii) cooling the mixt.; and (iv) isolating (I). Precondensate (A) is prepd. by heating a mixt. of at least two inter-reacting monomers at a constant temp. with at least partial formation of a melt and continuing the reaction until a homogeneous melt is obtd..

    10.
    发明专利
    未知

    公开(公告)号：DE4023028A1

    公开(公告)日：1992-01-23

    申请号：DE4023028

    申请日：1990-07-20

    Applicant: HOECHST AG

    Inventor： BLATTER KARSTEN DR ,  HARNISCHFEGER PETER DR ,  HEMMERLING WOLFGANG DR ,  WINGEN RAINER DR

    IPC: C08G77/38 ,  C08G77/388 ,  C09K19/40

    Abstract: A liquid crystal copolymer has the formula (I), in which l, m, p, q, r, s are equal to zero or to an integer between 1 to 100, independently from each other, provided that the sum l+m+p+q+r+s is an integer greater than 2 and that at least two of the indices m, p, q, r, s are greater than zero; n = 1 to 500; Y , Y , Y , Y , Y are a group of general formula (CH2)a(-B)b-M (-A )c(-M )d(-A )e(-M )f(-A )g-R , independently from each other, whereas B is for example a group having the formula alpha , in which R , R , R are for example H or CH3 and X is for example chlorine; R is for example a straight chain alkyl with 1 to 16 C atoms; a = 2 to 20; b, c, d, e, f, g = 0 or 1; A , A , A are for example phenylene or pyrimidine-2,5-diyl; M , M , M are for example COO or OCO. This copolymer is particularly useful as component of liquid crystal switching devices.

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