POLYMERIZABLE LIQUID CRYSTAL COMPOSITION, OPTICAL ANISOTROPIC MATERIAL, OPTICAL ELEMENT, AND OPTICAL HEAD DEVICE
申请人:Asahi Glass Company, Limited
公开号:EP1873228A1
公开(公告)日:2008-01-02
To provide optical elements such as a phase plate suitably used in a broadband range and a polarizing diffraction element excellent in diffraction efficiency, a polymerizable liquid crystal composition to be used for them, and an optical head device using them.
A polymerizable liquid crystal composition containing a polymerizable compound having a mesogen structure comprising the following condensed benzene ring group (A) and the following 6-membered cyclic group (B) bonded to at least one bond in the group (A) directly or via a connecting group -OCO- or -COO-, and a monovalent terminal group bonded to each of both terminals of the mesogen structure, at least one of the terminal groups being a monovalent organic group having a polymerizable moiety:
condensed benzene ring group (A): a naphthalenediyl group having bonds at 1-position and at 4- or 5-position, or an anthracenediyl group having bonds at 1- or 9-position and at 4-, 5- or 10-position;
6-membered cyclic group (B): a 1,4-phenylene group, a trans-1,4-cyclohexylene group or a bivalent group having at least two groups selected from these groups bonded directly or via a connecting group.
提供适合在宽带范围内使用的相板和衍射效率极佳的偏振衍射元件等光学元件、用于它们的可聚合液晶组合物以及使用它们的光学头装置。
一种可聚合液晶组合物,含有一种可聚合化合物,该化合物具有中间基结构,包括以下缩合苯环基团(A)和以下 6 元环基(B),它们直接或通过连接基团 -OCO- 或 -COO- 与基团(A)中的至少一个键结合,以及与中间基结构的两个末端各结合一个单价末端基团,其中至少一个末端基团是具有可聚合分子的单价有机基团:
缩合苯环基团(A):在 1-位和 4-位或 5-位上有键的萘二基,或在 1-位或 9-位和 4-位、5-位或 10-位上有键的蒽二基;
6 元环状基团 (B):1,4-亚苯基基团、反式-1,4-环己烯基团或至少有两个选自上述基团的基团直接或通过连接基团键合的二价基团。