发明授权
- 专利标题: Liquid-crystalline polymers of virtually uniform molecular weight
- 专利标题(中): 几乎均匀分子量的液晶聚合物
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申请号: US880578申请日: 1992-05-08
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公开(公告)号: US5332520A公开(公告)日: 1994-07-26
- 发明人: Volker Bach , Karl-Heinz Etzbach , Karl Siemensmeyer
- 申请人: Volker Bach , Karl-Heinz Etzbach , Karl Siemensmeyer
- 申请人地址: DEX Ludgwigshafen
- 专利权人: BASF Aktiengesellschaft
- 当前专利权人: BASF Aktiengesellschaft
- 当前专利权人地址: DEX Ludgwigshafen
- 优先权: DEX4115415 19910510
- 主分类号: C08F20/02
- IPC分类号: C08F20/02 ; C08F20/10 ; C08F20/12 ; C08F20/30 ; C09K19/38 ; G02F1/13 ; C09K19/52 ; C08F22/10 ; G11B7/24
摘要:
A liquid-crystalline polymer of virtually uniform molecular weight, obtainable by polymerizing identical or different monomers of the formula I ##STR1## where R is hydrogen, chlorine or methyl,A is a flexible, long-chain moiety which acts as a spacer, is a mesogenic moiety built up from at least two aromatic rings which are linked to one another in a linear or approximately linear manner, andC is an optically active, chiral moiety,in from 0.01 to 0.1 molar solution in an inert organic solvent in the presence of from 1 to 40 mol %, based on the monomers, of a free-radical initiator, at from 40.degree. to 60.degree. C. for from 100 to 140 hours, and subsequently isolating the polymerization product from the reaction mixture, and the use thereof for building up recording layers for laser-optical and electrical recording elements and for electrophotography and for building up liquid-crystalline display elements.
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