| 摘要 |
PURPOSE: To obtain a liquid crystal composition suppressed in the reduction in a drive margin at a high-temperature region and giving a good image even at high temperatures by mixing two specified liquid crystal compounds with each other in a specified ratio. CONSTITUTION: This composition is prepared by mixing 0.1-30wt.% each of liquid crystal compounds of formulas I and II (wherein R1 , R2 and R3 are each a 1-18C linear or branched alkyl; X1 and X2 are each a single bond, O, a group of formula III or the like; X3 is a single bond, OCH2 , a group of formula III or the like; A1 is a group of formula IV or a group of formula V; A2 is a group of formula VI, a group of formula VII or the like; and (m) is 3-16). It is desirable that this composition has chiral smectic C phase and that the tilt angleδof the layer of the chiral smectic C phase has an adjusted value of 3-15 deg. in the temperature range of 0-60 deg.C. The composition can be desirably used in the production of a ferroelectric liquid crystal element, a ferroelectric liquid crystal device, a liquid crystal optical shutter, etc.
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