Patent ID: 6852375
Filing Date: 2005-02-08
Classification: C09K

Abstract:
1. A preparation method of a chiral nematic liquid crystal composition which shows cholesteric phase at room temperature and is able to reflect light in visible region selectively, the composition containing at least a nematic liquid crystal material, a first chiral material with shift direction of selective reflection wavelength toward long wavelength direction depending on temperature and a second chiral material with shift direction of selective reflection wavelength toward short wavelength direction depending on temperature, wherein, to set anisotropy of dielectric constant of whole chiral nematic liquid crystal composition to a predetermined value, at least one chiral material between the first chiral material and the second chiral material comprises two or more chiral compounds and a mixing ratio of the two or more chiral compounds is controlled, and/or the nematic liquid crystal material comprises two or more kinds of nematic liquid crystal compounds and a mixing ratio of the two or more nematic liquid crystal compounds is controlled.