Optically anisotropic film

Details Optically anisotropic film Optically anisotropic film

1995-11-09

1998-04-07

Kelly, C. H.

Compositions

Liquid crystal compositions

428 11, C09K 1952, C09K 1900

Patent

active

057360669

ABSTRACT:
The present invention provides an optically anisotropic film characterized in that the retardation at 80.degree. C. is 20-97% of that at 30.degree. C., and the film is made from a mixture of a transparent or semitransparent polymer and at least one liquid crystal compound, wherein the ratio of the liquid crystal compound in the mixture is 0.5-50% by weight based on the combined weight of the liquid crystal compound and the polymer, or an optically anisotropic film characterized in that the retardation at 60.degree. C. is 50-99% of that at 30.degree. C., and the film comprises a mixture of a transparent or semitransparent polymer and at least one liquid crystal compound, wherein the ratio of the liquid crystal compound in the mixture is 0.5-50% by weight based on the combined weight of the liquid crystal compound and the polymer. These optically anisotropic films have a temperature dependence of retardation corresponding to that of the liquid crystal display cell used in combination with the film, show a temperature compensating effect, and are also excellent in viewing angle characteristics and display performance, so that they can be used for the production of composite optically anisotropic films or liquid crystal display devices.

REFERENCES:
patent: 5245456 (1993-09-01), Yoshimi et al.
patent: 5308535 (1994-05-01), Scheubic et al.
patent: 5472635 (1995-12-01), Iida et al.
patent: 5543267 (1996-08-01), Stumpe et al.
patent: 5601884 (1997-02-01), Ohnishi et al.

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