Light modulating material and method for preparing same

Details Light modulating material and method for preparing same Light modulating material and method for preparing same

1987-08-28

1989-12-19

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonchiral additive having no specified mesophase

25229901, 428 1, 350350R, G02F 113, C09K 1954, C09K 1952, C09K 1900

Patent

active

048881260

ABSTRACT:
An improved light modulating material for use in electro-optic and thermo-optic display devices is produced by forming a homogeneous solution comprising an acrylic resin containing active hydrogen groups, a liquid crystal material, a diisocyanate or epoxide, and a solvent. The homogeneous solution is preferably applied to a conductive substrate and the solvent is then evaporated, causing phase separation resulting in formation of a liquid crystal phase dispersed within a solid polymer matrix. Application of an electric field to the substrate causes the liquid crystal material to align, which in turn causes the coating to switch from substantially translucent to substantially transparent. If the electric field is removed the light modulating material again becomes substantially translucent. Switching times can be improved by incorporating a titanate or zirconate organometallic material into the light modulating material.

REFERENCES:
patent: 3872050 (1975-03-01), Benton et al.
patent: 3935337 (1976-01-01), Taylor
patent: 4101207 (1978-07-01), Taylor
patent: 4623738 (1986-10-01), Sugerman et al.
patent: 4672089 (1987-06-01), Pricone et al.
patent: 4688900 (1987-08-01), Doane et al.
patent: 4707080 (1978-02-01), Fergason
patent: 4742097 (1986-11-01), Turpin et al.

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