A compound having a repeating unit represented by general formula (I)
A1-M1-X-B-Y-M2-A2 (I)
wherein A1 and A2 are terminal chain groups, respectively; M1 and M2 are mesogen groups, respectively; X and Y are independently a bonding group selected from -COO- and -OCO-; and B is an aromatic group. The compound exhibits ferroelectric twisted grain boundary liquid crystalline properties over a wide range of temperature, and the crystal phases originating from such structure absorb light over a wide range of spectrum including visible light and, hence, are useful as a material for preparing light controlling devices, optical filters, recording devices, heat-sensitive ink, heat-sensitive pigments, toner pigments and the like, showing high industrial usefulness. Furthermore, the thermolabels, heat-sensitive recording media and the like of the present invention have high coloring and decoloring rates and are less expensive because of having no optically active group.
具有通式(I)代表的重复单元的化合物
A1-M1-X-B-Y-M2-A2 (I)
其中 A1 和 A2 分别为末端链基团;M1 和 M2 分别为中间基团;X 和 Y 分别为选自 -COO- 和 -OCO- 的键合基团;B 为芳香基团。该化合物在很宽的温度范围内表现出
铁电扭转晶界液晶特性,由这种结构产生的晶相在包括可见光在内的很宽的光谱范围内吸收光,因此可用作制备光控设备、光学滤光片、记录设备、热敏墨
水、热敏
颜料、墨粉
颜料等的材料,具有很高的工业实用性。此外,本发明的热敏标签、热敏记录介质等具有较高的着色率和脱色率,并且由于不含光学活性基团,成本较低。