22.
    发明专利
    未知

    公开(公告)号:AT140256T

    公开(公告)日:1996-07-15

    申请号:AT92118322

    申请日:1992-10-27

    Applicant: BASF AG

    Abstract: The process according to the invention is a process for the preparation of aligned, ferroelectrically or ferrielectrically or antiferroelectrically ordered materials which solidify in a glass-like manner. In these layer structures which are ordered in a polar manner, the molecular dipole moments are not compensated, are partially compensated or are fully compensated, so that a dipole moment which corresponds to the degree of compensation is apparent from the outside.

    26.
    发明专利
    未知

    公开(公告)号:DE3880005D1

    公开(公告)日:1993-05-13

    申请号:DE3880005

    申请日:1988-05-11

    Applicant: BASF AG

    Abstract: An optical recording medium comprises a transparent support; a laser-sensitive dye contg. layer; and a reflective layer contg. a silicon-phthalocyanine deriv. of formula (I) in whcih R1 is bounded to the phthalocyanine residue, R1 = H, 1-12 C alkyl, 1-12 C alkoxy, halogen or -Si(R2)(R3)(R4) in which R2, R3 and R4 each = 1-5 C alkyl; n = 1, 2, 3 or 4; and A and B each = 1-12 C alkyl, halogen or -OR5 in which R5 = 1-12 C alkyl which is opt. interrupted by one or more O atoms or 1-14 C alkylimino gps. and/or which is opt. substd. by a 5- or 6-membered satd. heterocyclic residue, or a gp. Si(R2)(R3)(R4) where R2, R3 and R4 are as above.

    28.
    发明专利
    未知

    公开(公告)号:DE4114990A1

    公开(公告)日:1992-11-12

    申请号:DE4114990

    申请日:1991-05-08

    Applicant: BASF AG

    Abstract: Tryptanthrine derivatives of the formula in which the rings A and B can be benzo-fused and/or substituted and X denotes a radical which is derived from a CH-acidic heterocycle which optionally contains a further tryptanthrine radical or from a hydrazinoanthraquinone or, if at least one of the rings A and B are benzo-fused and/or substituted by phthaloyl, also denotes oxygen, and the use of these compounds as colorants.

    30.
    发明专利
    未知

    公开(公告)号:DE3930667A1

    公开(公告)日:1991-03-28

    申请号:DE3930667

    申请日:1989-09-14

    Applicant: BASF AG

    Abstract: In a new process for reversible or irreversible production of an image by the photographic effect of energy on a recordng layer in the presence or absence of an electrical and/or magnetic field, a pattern of surface charges corresponding to the photographic effect of energy is produced on the surface of the recording layer. The recording layer contains or consists of a vitreous organic material which has permanent dipoles and zero or negligible photoconductivity. The surface charge pattern is produced, with little or no formation of free charge carriers, by reversible photographic alignment of all or some of the permanent dipoles present in the recording layers. The new process is advantageously carried out with a new appliance which comprises a suitable recording element, devices for obtaining the photographic effect of energy on the recording layer of the recording element, and a counter-electrode in direct contact with the recording layer and which can be separated from the latter. The surface charge pattern produced by the new process can be treated with liquid or solid toners. The resulting toner image can then be fixed on the recording layer or transferred from the recording layer to another surface. The surface charge pattern can then be erased by the action of energy over the entire surface. It is thus possible to produce photocopies without using the high-voltage sources required for conventional electrophotographic processes.

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