Compositions – Liquid crystal compositions
Reexamination Certificate
2000-10-26
2003-12-30
Wu, Shean C. (Department: 1756)
Compositions
Liquid crystal compositions
C252S299640, C252S299650, C252S299660, C252S299670, C522S170000, C522S182000
Reexamination Certificate
active
06669865
ABSTRACT:
The invention relates to a liquid crystal display device comprising a liquid crystal cell and at least one reflective polarizer or a polarizer combination comprising at least one reflective polarizer as a means to generate circular polarized light, said reflective polarizer comprising an optically active layer of an anisotropic polymer material with a helically twisted planar molecular orientation, wherein the material is oriented so that the axis of the molecular helix extends transversely to the layer, in which the pitch of the molecular helix is varied in such a manner that the difference between the maximum pitch and the minimum pitch is at least 100 nm, characterized in that said reflective polarizer is obtainable by copolymerization of a mixture of a chiral polymerizable mesogenic material comprising
a) at least one achiral polymerizable mesogenic compound having at least one polymerizable functional group in the presence of
b) at least one chiral polymerizable mesogenic compound having one polymerizable functional group and/or at least one non-polymerizable chiral mesogenic compound,
c) an initiator,
d) optionally a non-mesogenic compound having at least one polymerizable functional group,
e) optionally a dye and
f) optionally a stabilizer.
The invention also relates to methods of manufacturing said reflective polarizers. The invention further relates to mixtures of chiral polymerizable mesogenic material used for the manufacturing of said reflective polarizers.
REFERENCES:
patent: 5560864 (1996-10-01), Goulding
patent: 6207770 (2001-03-01), Coates et al.
patent: 6217948 (2001-04-01), Verrall et al.
patent: 6217955 (2001-04-01), Coates et al.
patent: 6316066 (2001-11-01), Jolliffe et al.
patent: 6319963 (2001-11-01), Coates et al.
patent: 6379758 (2002-04-01), Hanmer et al.
patent: 195 04 224 (1995-08-01), None
patent: 0 606 939 (1994-07-01), None
patent: 0 606 940 (1994-07-01), None
patent: 0 643 121 (1995-03-01), None
patent: 2 297 556 (1996-08-01), None
patent: 2 299 333 (1996-10-01), None
Coates David
Goulding Mark
Greenfield Simon
Hanmer James
Marden Shirley
Merck Patent Gesellschaft mit beschrankter Haftung
Millen White Zelano & Branigan P.C.
Wu Shean C.
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