Method of manufacturing a switchable cholesteric filter as well

Details Method of manufacturing a switchable cholesteric filter as well Method of manufacturing a switchable cholesteric filter as well

1996-12-18

1998-08-25

Wo, Shean C.

Compositions

Liquid crystal compositions

Containing nonchiral additive having no specified mesophase

349104, 428 1, C09K 1900, C02F 11335

Patent

active

057980578

ABSTRACT:
The invention provides a simple method of manufacturing a broadband, switchable cholesteric filter. To this end, a mixture of polymerizable, liquid-crystalline molecules is provided between two, substantially parallel substrates, which are each provided with an electrode. This mixture is subsequently polymerized with UV light to form an optically active layer of cholesteric order comprising a three-dimensional polymeric network. If the mixture also contains a quantity of a photo-stabilizing compound, a broadband, cholesteric filter is obtained. The mixture preferably comprises, in addition to maximally 5 wt. % of the photo-stabilizing compound, maximally 2 wt. % of monomers having at least two polymerizable groups, maximally 90 wt. % of liquid-crystalline monomers having one polymerizable group, as well as a mixture of chiral and/or achiral liquid-crystalline molecules without a polymerizable group. Switchable cholesteric filters having a bandwidth of 200 nm and more can be obtained in this manner.

REFERENCES:
patent: 5602661 (1997-02-01), Schadt et al.
"Photochemistry of Man-made Polymers" by John F. McKellar et al, Applied Science Publishers Ltd., London, 1979, pp. 216-255.

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