Compositions – Liquid crystal compositions
Patent
1991-11-27
1994-11-15
Dang, Thi
Compositions
Liquid crystal compositions
2522997, C09K 1952
Patent
active
053645570
ABSTRACT:
In color printing, and in the fine arts, cholesteric liquid crystal (CLC) color inks are known to possess much higher color saturation and brightness than conventional pigment and dyed based inks. However, prior art CLC ink formulations are inconvenient because in the liquid phase they have to be confined in cells, and in the solid phase, they have to be applied at high temperature, and have to be aligned by some means to produce the optimum color. This invention solves the problem encountered in the CLC prior art, by making pre-aligned CLC platelets or flakes of appropriate thickness and size and mixing them in appropriate host fluids producing a novel CLC ink which can be applied at room temperature and without the need for alignment. The new pre-aligned room temperature CLC ink can be used as a substitute for conventional inks in almost all printing and plotting, and manual drawing and painting. Using the notch filter CLC platelets, the brightness is further enhanced. This invention teaches the CLC ink concepts, its applications and method of manufacturing.
REFERENCES:
patent: 4707080 (1987-11-01), Fergason
patent: 4859360 (1989-08-01), Suzuki et al.
patent: 5198148 (1993-03-01), Nakano
Dang Thi
Kilgannon, Jr. Thomas J.
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