Method for obtaining composite materials based on polymers and l

Details Method for obtaining composite materials based on polymers and l Method for obtaining composite materials based on polymers and l

1994-02-23

1995-07-04

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 52, G02F 113

Patent

active

054305632

ABSTRACT:
Disclosed is an original method for preparing composite materials for a display screen, these materials containing a polymer, liquid crystal and dye. The present problem is one of inserting molecules of dye into composites of this type. The disclosed method proposes the preparation, in a first step, of a porous film of reticulate polymer. Then, molecules of liquid crystal (XL) and molecules of dye (C) are made to diffuse therein by a polymer-expanding solvent. After evaporation of the solvent, a film of polymer is obtained with inclusions containing liquid crystal (XL) and dye (C) with a wide range of concentrations in liquid crystal, thus making it possible to optimize the performance characteristics in terms of contrast and control voltage of the screen thus made.

REFERENCES:
patent: 4354741 (1982-10-01), Mano et al.
patent: 5088807 (1992-02-01), Water et al.
patent: 5268783 (1993-12-01), Yoshinaga et al.
patent: 5372745 (1994-12-01), Yoshinaga et al.

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