申请人:——
公开号:US04180475A1
公开(公告)日:1979-12-25
Liquid crystal mixtures having positive anisotropy of the dielectric constants which comprise a nematogenic mixture with a clearing point above 60.degree. C. which is doped with an organic solvent or solvent mixture with a specific resistance of at least 10.sup.7 Ohm.cm. as well as a dipole moment along the longitudinal axis of the molecule of less than 3.5 Debye, or with a compound of the formula ##STR1## wherein R.sub.14 and R.sub.15 are straight-chain alkyl containing a total of not more than 14 carbon atoms or R.sub.14 is straight-chain alkyl and R.sub.15 is straight-chain alkoxy containing a total of not more than 8 carbon atoms, or a compound of the formula ##STR2## wherein R.sub.16 and R.sub.17 are straight-chain alkyl containing a total of not more than 6 carbon atoms, or a compound of the formula ##STR3## wherein R.sub.16 and R.sub.17 are straight-chain alkyl containing a total of not more than 6 carbon atoms, or mixtures thereof, are described.
本发明涉及具有介电常数正各向异性的液晶混合物,包括一个具有清晰点高于60°C的向列相混合物,该混合物掺杂有具有至少10.sup.7欧姆·厘米比电阻的有机溶剂或溶剂混合物,以及沿分子纵轴具有小于3.5德拜偶极矩的直链烷基总数不超过14个碳原子的化合物,其中R.sub.14和R.sub.15是直链烷基,总碳原子数不超过14个,或R.sub.14是直链烷基,R.sub.15是直链烷氧基,总碳原子数不超过8个的化合物,或化合物的公式##STR1##其中R.sub.16和R.sub.17是直链烷基,总碳原子数不超过6个,或化合物的公式##STR2##其中R.sub.16和R.sub.17是直链烷基,总碳原子数不超过6个,或它们的混合物。