Compositions – Liquid crystal compositions
Reexamination Certificate
2006-04-03
2008-08-19
Wu, Shean C (Department: 1795)
Compositions
Liquid crystal compositions
C430S002000, C430S020000, C359S015000
Reexamination Certificate
active
07413678
ABSTRACT:
A new photopolymerizable material allows single-step, fast recording of volume holograms with properties that can be electrically controlled. Polymer-dispersed liquid crystals (PDLCs) in accordance with the invention preferably comprise a homogeneous mixture of a nematic liquid crystal and a multifunctional pentaacrylate monomer in combination with photoinitiator, coinitiator and cross-linking agent. Optionally, a surfactant such as octanoic acid may also be added. The PDLC material is exposed to coherent light to produce an interference pattern inside the material. Photopolymerization of the new PDLC material produces a hologram of clearly separated liquid crystal domains and cured polymer domains.
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Sutherland, Richard L., “Polarization and Switching Properties of Holographic Polymer-Dispersed Liquid-Crystal Gratings.
Bunning Timothy J.
Natarajan Lalgudi V.
Sutherland Richard L.
Tondiglia Vince P.
King & Spalding LLP
Science Applications International Corporation
Wu Shean C
LandOfFree
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