Patent ID: 8617420

Claim:
An optically isotropic liquid crystal composition having a liquid crystal component comprising a liquid crystal component A consisting of one or more compounds represented by general formula (1-1) or (1-2) and chiral dopants, wherein in the liquid crystal component, the content of compounds having 3 to 5 ring structures is approximately 15 wt % or more, and wherein in formulae (1-1) and (1-2): R 1 is alkenyl having 2 to 20 carbon atoms, wherein any â€”CH 2 â€” in the alkenyl can be replaced by â€”Oâ€”, â€”Sâ€”, â€”COOâ€”, â€”OCOâ€”, â€”CHâ•CHâ€” or â€”Câ‰¡Câ€”; and any hydrogen in the alkenyl can be replaced by halogen; Ring A 1 , Ring A 2 , Ring A 3 and Ring A 4 are each independently a benzene ring, a naphthalene ring, a cyclohexene ring, a bicyclooctane ring or a cyclohexane ring, wherein any hydrogen in these rings can be replaced by halogen; any â€”CH 2 â€” in the rings can be replaced by â€”Oâ€” or â€”Sâ€”; and any â€”CHâ• in the rings can be replaced by â€”Nâ•; Z 0 is a single bond or alkylene having 1 to 20 carbon atoms, wherein any â€”CH 2 â€” in the alkylene can be replaced by â€”Oâ€”, â€”Sâ€”, â€”COOâ€”, â€”OCOâ€”, â€”CSOâ€”, â€”OCSâ€”, â€”CHâ•CHâ€”, â€”CFâ•CFâ€” or â€”Câ‰¡Câ€”; and any hydrogen can be replaced by halogen; Z 1 , Z 2 , Z 3 and Z 4 are each independently a single bond or alkylene having 1 to 4 carbon atoms, wherein any â€”CH 2 â€” in the alkylene can be replaced by â€”Oâ€”, â€”Sâ€”, â€”COOâ€”, â€”OCOâ€”, â€”CSOâ€”, â€”OCSâ€”, â€”CHâ•CHâ€”, â€”CFâ•CFâ€” or â€”Câ‰¡Câ€”; and any hydrogen can be replaced by halogen; L 1 and L 2 are each independently hydrogen or halogen; X 1 is halogen, â€”Câ‰¡N, â€”Nâ•Câ•S, â€”Câ‰¡Câ€”Câ‰¡N, â€”SF 5 , â€”CHF 2 , â€”CF 3 , â€”CF 2 CH 2 F, â€”CF 2 CHF 2 , â€”CF 2 CF 3 , â€”(CF 2 ) 3 â€”F, â€”CF 2 CHFCF 3 , â€”CHFCF 2 CF 3 , â€”(CF 2 ) 4 â€”F, â€”(CF 2 ) 5 â€”F, â€”OCHF 2 , â€”OCF 3 , â€”OCF 2 CH 2 F, â€”OCF 2 CHF 2 , â€”OCH 2 CF 3 , â€”OCF 2 CF 3 , â€”Oâ€”(CF 2 ) 3 â€”F, â€”OCF 2 CHFCF 3 , â€”OCHFCF 2 CF 3 , â€”Oâ€”(CF 2 ) 4 â€”F, â€”Oâ€”(CF 2 ) 5 â€”F, â€”CHâ•CF 2 , â€”CHâ•CHCF 3 or â€”CHâ•CHCF 2 CF 3 ; and l, m, n and o are each independently 0 or 1; and l+m+n+oâ‰§1; wherein the liquid crystal component does not contain a liquid crystal component D consisting of at least one compound selected from the group consisting of compounds represented by general formulae (7) to (9), and wherein in the formulae: R 4 and R 5 are each independently alkyl having 1 to 10 carbon atoms or alkenyl having 2 to 10 carbon atoms, wherein any â€”CH 2 â€” in the alkyl and the alkenyl can be replaced by â€”Oâ€”; Ring D 1 , Ring D 2 and Ring D 3 are each independently 1,4-cyclohexylene, pyrimidine-2,5-diyl, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene or 2,5-difluoro-1,4-phenylene; Z 9 and Z 10 are each independently â€”Câ‰¡Câ€”, â€”COOâ€”, â€”(CH 2 ) 2 â€”, â€”CHâ•CHâ€” or a single bond; and wherein the liquid crystal component has a value of Î”nÃ—Î”Îµâ‰§3.39, when there is no chiral dopant.