Polaroid Corporation

Herbert L Fielding

Richard T Ingwall

Novel photopolymerizable compositions are provided which comprise a dye sensitizer, a branched polyethylenimine as a polymerization initiator and a free radical polymerizable ethylenic unsaturated monomer. In the preferred embodiments, the branched polyethylenimine is used in combination with lithium acrylate. This combination provides dry coatings which may be stored for extended periods prior to being activated for imaging, and which produce volume holograms of very high resolution and diffraction efficiency.

Photopolymerizable compositions used in holograms

Volume phase holograms formed by photopolymerization of a polymerizable monomer, e.g., lithium acrylate, exhibit substantially increased retention of diffraction efficiency when exposed to high humidity if they are sequentially treated with a zirconium compound and a fatty acid.

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Wilmington, MA, United States of America

Herbert L Fielding