Polar tolane liquid crystals

Details Polar tolane liquid crystals Polar tolane liquid crystals

2005-01-04

2005-01-04

Wu, Shean C (Department: 1756)

Compositions

Liquid crystal compositions

C252S299610, C570S127000, C570S128000, C570S153000

Reexamination Certificate

active

06838017

ABSTRACT:
New tolane and bis-tolane compounds:in which X is F (fluoro), CN (cyano), OCF3(trifluoromethoxy), or NCS (isothiocyanate) at least one of the pairs Y1and Y2, Z1and Z2, and A1and A2are fluoro groups.T1for the tolanes is a triple bond. For the bis-tolane T1and T2are either both triple bonds or one of the two groups is a double bond.Rnor Rmmay be an alkyl group, and alkenyl group, and alkoxy group, or an alkenoxy group. For the tolane compounds, Rnmay be a:dioxane substituent: in which Rxmay be as Rnor Rmabove.These compounds exhibit useful nematic ranges and melting points. Also disclosed are eutectic mixtures including these compounds.

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