Suspension for light valve, e.g. window, display, mirror or windscreen - contains aromatic ester and copolymer with free functional gp. to prevent agglomeration

摘要

Suspension for light valves consists of numerous (colloidally) suspended particles (I), which respond to an electric field, with change of transmission of the incident light, a suspending medium (II), comprising an aromatic ester (IIA) of an aromatic alcohol, and a copolymer (III) of min. 2 different monomers. At least one monomer (IV) contains a free functional gp., e.g. a OH or COOH gp., and >=1 other (V) is soluble in (II), whilst the distance from the carrier chain to the most distant functional gp. of (IV) is less than the distance from the chain to a nonfunctional gp. of (V). Agglomeration is avoided. The light valves are useful in windows, displays, mirrors, windscreens etc.