Light valve, light valve suspension materials and suspension therefor
US4113362A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1977 |
| Grant date | Sep 12, 1978 |
| Priority date | — |
| Expiry date | May 11, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/172
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A light valve including suspending materials which have an ability to prevent or substantially retard agglomeration of the particles in suspension during the application of a voltage to the suspension. The materials include aromatic esters which are derivable from aromatic alcohols, such as phenyl acetate, cresyl acetate, para-butylphenyl acetate, para-nonylphenyl acetate, and structurally similar compounds. The suspension also includes, as an additional suspending material, a polymer such as a branched polymeric coating material to coat the particles in suspension and act in combination with the aromatic ester suspending materials to prevent or substantially reduce agglomeration of the particles when a voltage is applied to the suspension. Other suspending materials such as non-aqueous liquids or solids may also form part of the suspending medium of this invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.