发明授权
- 专利标题： Liquid crystalline bis-chlorocarbonic acid esters, a process for their preparation and liquid crystalline n-alkyl polyurethanes and polycarbonates prepared from them
- 专利标题（中）： 液晶双氯碳酸酯，其制备方法和液晶正烷基聚氨酯和由它们制备的聚碳酸酯
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申请号： US315859申请日： 1989-02-27
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公开(公告)号： US4980441A公开(公告)日： 1990-12-25
- 发明人: Hanns P. Muller , Bernhard Jansen , Wolfgang Calaminus , Rolf Dhein
- 申请人： Hanns P. Muller , Bernhard Jansen , Wolfgang Calaminus , Rolf Dhein
- 申请人地址： DEX Leverkusen
- 专利权人： Bayer Aktiengesellschaft
- 当前专利权人： Bayer Aktiengesellschaft
- 当前专利权人地址： DEX Leverkusen
- 优先权： DEX3808274 19880312
- 主分类号： C07C68/02
- IPC分类号： C07C68/02 ; C07C69/96 ; C08G63/64 ; C08G64/06 ; C08G64/10 ; C08G71/00 ; C08G71/04 ; C09K19/20 ; C09K19/38
摘要：
Liquid crystalline bis-chlorocarbonic acid esters are 4-hydroxybenzoic acid-(4'-hydroxyphenyl) esters corresponding to the following formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 denote, independently of one another, hydrogen, a halogen atom or a C.sub.1 to C.sub.6 alkyl group. Preparation of (I) and liquid crystalline N-alkyl polyurethanes and polycarbonates prepared form (I) are other invention embodiments.
公开/授权文献
- US5549474A Clamping device particularly useful for dental handpieces 公开/授权日：1996-08-27