Provided is a naphthalene compound represented by the following Formula (1):
wherein R1 and R2 each represent a linear or branched alkyl group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms which may be substituted with halogen atoms and have no asymmetric carbon atoms; provided that at least one of R1 and R2 is an alkoxyalkyl group represented by Formula (III):
-CdH2dO(CeH2eO)fCgH2g+1 (III)
(wherein d represents a natural number of 1 to 10; e represents a natural number of 1 to 10; f represents a natural number of 0 to 5; and g represents a natural number of 1 to 12, provided that d + e x f + g ≤ 20); A represents any of the groups represented by the following formulas:
(wherein X1, X2, X3 and X4 each represent a hydrogen atom or a halogen atom); and z represents 0 or 1. The addition of this naphthalene compound to a liquid crystal composition makes it possible to improve various characteristics such as the high speed response property of the liquid crystal composition and the temperature dependency of the response time. The above naphthalene compound is useful as a liquid crystal material for liquid crystal compositions, particularly ferroelectric liquid crystal compositions.
本发明提供了由下式(1)表示的
萘化合物:
其中 R1 和 R2 分别代表具有 1 至 20 个
碳原子的直链或支链烷基、具有 2 至 20 个
碳原子的烷
氧基烷基或具有 2 至 20 个
碳原子的
烯基,它们可被卤素原子取代且不具有不对称
碳原子;条件是 R1 和 R2 中至少有一个是式 (III) 所代表的烷
氧基烷基:
-CdH2dO(CeH2eO)fCgH2g+1 (III)
(其中 d 代表 1 至 10 的自然数;e 代表 1 至 10 的自然数;f 代表 0 至 5 的自然数;g 代表 1 至 12 的自然数,条件是 d + e x f + g ≤ 20);A 代表下式所代表的任何基团:
(其中 X1、X2、X3 和 X4 各代表一个
氢原子或一个卤素原子);以及 z 代表 0 或 1。在
液晶组合物中加入这种
萘化合物可以改善各种特性,如
液晶组合物的高速响应特性和响应时间的温度依赖性。上述
萘化合物可用作
液晶组合物,特别是
铁电
液晶组合物的
液晶材料。