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    1.
    发明专利
    未知

    公开(公告)号：DE3884420D1

    公开(公告)日：1993-11-04

    申请号：DE3884420

    申请日：1988-02-08

    Applicant: BASF AG

    Inventor： WAGENBLAST GERHARD DR ,  ETZBACH KARL-HEINZ DR ,  HISGEN BERND DR

    IPC: B41M5/36 ,  G11B7/00 ,  G11B7/0055 ,  G11B7/013 ,  G11B7/12 ,  G11B7/24

    Abstract: Optical laser writing and reading method, in which the thermally variable recording layer, containing liquid-crystal bonds oriented in a homogeneously planar manner, of a multilayer sheet-like recording material is inscribed by means of a writing laser beam with analog or digital data in the form of thermally varied regions, after which the written data are read by means of a reading laser beam. In this method - the light transmitted or reflected by the recording material is analysed, - the data is read out by determining the optical polarisation contrast between the thermally varied and the non-varied regions and/or use is made for this of the interference of light waves which form from the laser light waves with Gaussian intensity distribution as a result of the different phase velocity of the light in the centre of thermally varied regions on the one hand and of their thermally non-varied environment on the other hand, - use is made of a recording layer which constitutes an optically uniaxial medium, to the refractive indices n1 (perpendicular to the plane of the recording layer), n2 (in the plane of the recording layer and perpendicular to the major optical axis), n3 (in the plane of the recording layer and parallel to the major optical axis) and niso (refractive index of the thermally varied regions), with niso = 1/3(n1 + n2 + n3), of light of the wavelength lambda = 780 nm, of which apply the relations n1 = n2 n3 and | DELTA n| = |n3-n2| > 0.05 or | DELTA n| = |niso-n2| > 0.05 or alternatively | DELTA n| = |niso-n3| > 0.05, and which has a thickness d of 0.05 lambda '/| DELTA n| to 0.6 lambda '/| DELTA n|, lambda ' = wavelength of the reading laser light, - the reading laser beam is guided over the recording material in a relative movement in the direction of the major optical axis of the recording layer or perpendicularly to this and the reading laser beam is at the same time so radiated that, when it strikes the recording layer, the plane of its polarisation @ forms with its major optical axis an angle of 0 DEG +/- 10 DEG , 45 DEG +/- 10 DEG or 90 DEG +/- 10 DEG , and - in the event that the transmitted light is analysed, a laser beam of light of the wavelength lambda ' of 1.66 d | DELTA n| to 5 d | DELTA n| is used and, in the event that the reflected light is analysed, a laser beam of light of the wavelength lambda ' of 3.33 d | DELTA n| to 20 d | DELTA n| is used. The invention also relates to new optical laser writing and reading devices for carrying out this method and new multilayer optical laser data plates, the thermally variable recording layer of which contains liquid-crystal bonds in a homogeneously planar and radial or homogeneously planar and tangential orientation.

    5.
    发明专利
    未知

    公开(公告)号：DE3542833A1

    公开(公告)日：1987-06-11

    申请号：DE3542833

    申请日：1985-12-04

    Applicant: BASF AG

    Inventor： HISGEN BERND DR ,  PORTUGALL MICHAEL DR ,  BLINNE GERD DR

    IPC: C08G73/14 ,  C08G73/16 ,  C09K19/38 ,  C08G75/23 ,  C08G63/46 ,  C08L79/08 ,  C08J5/18 ,  D01F6/78 ,  D01F6/74

    Abstract: Wholly aromatic mesomorphic polyether ester imides which form a liquid-crystalline fiber-forming melt below 320 DEG C. and are composed of (a) from 5 to 35 mol % of repeat units of the formula I (I) (b) from 5 to 35 mol % of repeat units of the formula II (II) where X is a chemical bond, -O-, -S-, -SO2-, -CO-, -Ch2- or =C(CH3)2, and n is 0 or 1, (c) from 15 to 30 mol % of repeat units of the formula III (III) (d) a molar amount corresponding to the total amount of (b) plus (c) minus (a) of repeat units of the formulae IV and/or V (IV) (V) (e) repeat units of the formula VI (VI) the mole percentages of components a, b, c, d and e adding up to a 100 mol % in each case, the preparation thereof and fibers, films and molding prepared therefrom.

    8.
    发明专利
    未知

    公开(公告)号：DE3687117D1

    公开(公告)日：1992-12-17

    申请号：DE3687117

    申请日：1986-11-24

    Applicant: BASF AG

    Inventor： KOCK HANS-JACOB DR ,  HISGEN BERND DR

    IPC: C08G69/32 ,  C08G69/44

    Abstract: Aromatic mesomorphic polyesteramides forming a liq. crystalline, fibre-forming melt below 320 deg.C contain (a) 5-35 mol.% (I), (b) 5-15 mol.% (II) (c) a molar amt. of (III) corresp. to the sum of (a + b) and opt. (e), comprising units of (VI) or (VII), (d) at least 10 mol.% IV (e) 2-15 mol.% of (V) or (VI) in which part of (VI) may be replaced with (VII) with the proviso that the sum of the mol. amts. of (a) to (e) are equal to 100 mol.%. Pref. (b) is partly replaced by VIII and/or IX comprising esp., 3-12 mol.% of (VIII) or (IX) and (a) may be partly replaced by R = halogen, 1-4C alkyl except tert.-Bu, or phenyl; n = 1, 2 or 3, esp. 5-15 mol.% of (X). Tg is pref. greater than or equal to 150 deg.C. The polyesteramides are prepd. by (i) reacting the underivatised hydroxy, amino and carboxy cpds. in the specified molar ratio with excess fatty acid anhydride at raised temps. (ii) distilling off fatty acid anhydride and fatty acid from the reaction mixture and pref. (iii) postcondensing at 150-250 deg.C.

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