Retardation film and compound

Details Retardation film and compound Retardation film and compound

2007-02-13

2007-02-13

Wu, Shean C (Department: 1756)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C349S117000

Reexamination Certificate

active

10801662

ABSTRACT:
To provide a retardation film (optical compensation sheet) using a liquid crystal compound excellent in both the wavelength dispersion property and the refractive index anisotropy, disclosed is a retardation film having an optically anisotropic layer formed of a compound represented by formula (I): [(R1)a—M—(L1)]b—(L2), wherein R1represents an alkyl group, at least one —CH2— group in the alkyl group may be substituted by —O—, —S—, —C(═O)—, —N(R2)—, —CH═CH— or —C≡C—, R2represents a hydrogen atom or an alkyl group, M represents a group comprising three or more aromatic rings, L1represents a single bond or a divalent alkylene group, the —CH2— group in the alkylene group may be substituted by —O—, —S—, —C(═O)— or —N(R2)—, L2represents a b-valent cyclic, alkene or alkyne group, a represents the number of R1s substituted to M, and b represents an integer of 2 to 6.

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