Compositions – Liquid crystal compositions
Reexamination Certificate
2011-03-29
2011-03-29
Wu, Shean C (Department: 1795)
Compositions
Liquid crystal compositions
C252S299200, C252S299610, C252S299620, C252S299630, C252S299660, C549S464000, C549S465000, C549S473000, C526S270000
Reexamination Certificate
active
07914700
ABSTRACT:
The invention relates to compounds of formula (I):wherein R1and R2are each independently selected from the group: H, F, Cl and CH3; n1 and n2 are each independently integers 3 to 20; q and r are each independently integers 0, 1 or 2, with the proviso that q+r is ≧1; D is a divalent chiral radical selected from the group:wherein R3is a C1 to C6 straight or branched chain alkyl group; and each B1and B2is a divalent radical independently selected from the group: R4-substituted-1,4-phenyl, wherein R4is H, —CH3or —OCH3; 2,6-naphthyl; and 4,4′-biphenyl; with the provisos that when q+r=3, at least one of B1and B2is R4-substituted-1,4-phenyl; and when q+r=4, at least two of B1and B2are R4-substituted-1,4-phenyl. The invention further relates to liquid crystal compositions comprising compounds of formula (I) and polymer networks derived from the polymerization of the liquid crystal compositions.
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Goldfinger Marc B.
Qi Kai
Rodriguez-Parada Jose Manuel
Silverman Lee A.
E. I. Du Pont de Nemours and Company
Wu Shean C
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