Birefringent film, polycyclic compound, coating liquid, and...

Details Birefringent film, polycyclic compound, coating liquid, and... Birefringent film, polycyclic compound, coating liquid, and...

2008-03-17

2010-06-15

Wu, Shean C (Department: 1795)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299010, C252S299610, C252S299620, C544S342000

Reexamination Certificate

active

07736707

ABSTRACT:
The present invention provides a birefringent film that hardly generates cracks even when the film is exposed under a high-temperature and high-humidity environment for a long period of time. The birefringent film of the present invention is a film containing, as a major component, a lyotropic liquid crystalline polycyclic compound containing an acenaphtho[1,2-b]quinoxaline derivative unit in a molecular structure and having a molecular weight of 500 or higher. The birefringent film of the present invention preferably has a refractive index ellipsoid showing a relationship of nx≧nz>ny, and more preferably has an in-plane birefringence of 0.01 or higher at the wavelength of 590 nm.

REFERENCES:
patent: 2005/0109986 (2005-05-01), Dutova et al.
patent: 2008/0206597 (2008-08-01), Iwakuma
patent: WO 2007029806 (2007-03-01), None

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