Fluorinated fluorene derivatives

Details Fluorinated fluorene derivatives Fluorinated fluorene derivatives

2006-08-08

2006-08-08

Wu, Shean C (Department: 1756)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299010, C252S299620, C570S127000, C570S129000, C570S183000, C570S187000

Reexamination Certificate

active

07087272

ABSTRACT:
The invention relates to fluorinated fluorene derivatives of negative DC anisotropy, of the formula Iin-line-formulae description="In-line Formulae" end="lead"?R1—(—A1—Z1—)k1—(—A2—Z2—)k2—W—(—Z3—A3—)k3—(—Z4—A4—)k4—R2Iin-line-formulae description="In-line Formulae" end="tail"?in whichW denotes the sub-formulaL1and L2, independently of one another, are H, F, Cl, —CH2F, —CHF2or —CF3, with the proviso that L1and L2are not both H,L3and L4, independently of one another, are H or F, andR1, R2, A1, A2, A3, A4, Z1, Z2, Z3, Z4, k1, k2, k3 and k4 are as defined above. The invention furthermore relates to liquid-crystalline media and to optical and electro-optical display elements.

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