Patent ID: 6761939
Filing Date: 2004-07-13
Classification: C09K

Abstract:
A liquid crystal medium comprising:a dielectrically positive component, component A, containing dielectrically positive compounds, comprising one or more compounds of formula I and one or more compounds of formula II whereinR1 and R2, independently of each other, are alkyl having 1 to 7 C-atoms, alkoxy having 1 to 7 C-atoms, fluorinated alkyl having 1 to 7 C-atoms, fluorinated alkoxy having 1 to 7 C-atoms, alkenyl having 2 to 7 C-atoms, alkenyloxy having 2 to 7 C-atoms, alkoxyalkyl having 2 to 7 C-atoms or fluorinated alkenyl having 2 to 7 C-atoms, and X1 and X2, independently of each other, are F, Cl, fluorinated alkyl having 1 to 4 C-atoms, or fluorinated alkoxy having 1 to 4 C-atoms, wherein, optionally, two of the 6-membered rings in formula I may be linked by a group selected from â€”CH2â€”CH2â€”, â€”CF2, CF2â€”, â€”CF2â€”Oâ€”, â€”Oâ€”CF2â€” and â€”COâ€”Oâ€”; and a dielectrically neutral component, component B containing dielectrically neutral compounds, comprising one or more compounds of formula IVb whereinR4â€² is alkyl having 1 to 7 C-atoms, alkoxy having 1 to 7 C-atoms, fluorinated akyl having 1 to 7 C-atoms, fluorinated alkoxy having 1 to 7 C-atoms, alkenyl having 2 to 7 C-atoms, alkenyloxy having 2 to 7 C-atoms, alkoxyalkyl, having 2 to 7 C-atoms, or fluorinated alkenyl having 2 to 7 C-atoms, and X4â€² is or F or Cl, wherein, optionally, two of the 6-membered rings in formula IVb may be linked by a group selected from â€”CH2â€”CH2â€”, â€”CF2â€”CF2â€”, â€”CF2â€”Oâ€”, â€”Oâ€”CF2â€” and â€”COâ€”Oâ€”.