发明授权
- 专利标题: Monomers and their use for the production of a laser-optical recording element which can be repeatedly erased and recorded on
- 专利标题(中): 单体及其用于生产可以反复擦除并记录的激光光学记录元件
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申请号: US814516申请日: 1991-12-30
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公开(公告)号: US5187248A公开(公告)日: 1993-02-16
- 发明人: Karl-Heinz Etzbach , Gerhard Wagenblast , Wolfgang Brox , Axel Paul , Volker Bach
- 申请人: Karl-Heinz Etzbach , Gerhard Wagenblast , Wolfgang Brox , Axel Paul , Volker Bach
- 申请人地址: DEX Ludwigshafen
- 专利权人: BASF Aktiengesellschaft
- 当前专利权人: BASF Aktiengesellschaft
- 当前专利权人地址: DEX Ludwigshafen
- 优先权: DEX3917196 19890526
- 主分类号: C09K19/38
- IPC分类号: C09K19/38 ; G11B7/25
摘要:
Novel laser-optical recording elements which can be repeatedly erased and recorded on contain recording layers (a) which exhibit enantiotropic, ferroelectric smectic liquid crystalline (S.sub.c*) behavior, so that they can be switched back and forth between two thermodynamically stable, optically distinguishable ferroelectric smectic liquid crystalline S.sub.C* order states on exposure to a laser beam of sufficient luminous power, by applying an external electric field. The recording layers (a) themselves consist mainly or exclusively of novel polymers P having chiral mesogenic side groups. The novel polymers P are prepared using the novel monomers of the general formula I ##STR1## where R is hydrogen, chlorine or methyl, A is a flexible space-maintaining long-chain molecular moiety, and C is an optically active chiral molecular moiety and B is a mesogenic molecular moiety composed of at least three aromatic nuclei which are bonded linearly or virtually linearly to one another, or they are prepared using the novel monomers I which contain specially selected molecular moieties B in a novel combination with selected molecular moieties C.
公开/授权文献
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