E.i. Dupont De Nemours and Company

William K Smothers

Bruce M Monroe

Dalen E Keys

Torence J Trout

Jacob Beutel

Mark Leaman Armstrong

Albert F Harrington

Krishna C Doraiswamy

Scott R Schicker

Gregory Charles Weed

Dominic M Chan

Evan D Laganis

Dillon F Scofield

Dillion F Scofield

George Lalka

Visible light absorbing dyes derived from tropinone are disclosed.

Visible dye photosensitizers derived from tropinone

This invention relates to photopolymerizable compositions containing initiator systems that absorb in the longer wavelength region of the visible spectrum. Photopolymerizable compositions containing selected photodissociable initiators in combination with photobleachable sensitizers are disclosed.

Photobleachable initiator systems

Solid photopolymerizable compositions and photosensitive elements are provided that are useful in preparing optical elements, and especially holograms. The composition contains a polymeric binder, a liquid ethylenically unsaturated monomer, and a photoinitiator system. Typical compositions have a refractive index modulation of at least 0.005 when measured per the specified test.

Photopolymerizable compositions in elements for hologram imaging

Photopolymerizable compositions containing photoinitiator systems that absorb in the visible are disclosed. The photopolymerizable compositions contain at least one ethylenically unsaturated monomer capable of free radical initiated addition polymerization and a photoinitiator system capable of being activated by actinic radiation. The photoinitiator system comprises a hexaarylbisimidazole, a chain transfer agent, and a sensitizer given by the formulae A or B wherein X and R.sub.1 -R.sub.13 are as defined herein. ##STR1##

Visible photosensitizers for photopolymerizable compositions

Photopolymerizable compositions containing photoinitiator systems that absorb in the visible are disclosed. The photoinitiator system comprises a sensitizer which is a compound of the structure I: ##STR1## wherein R.sub.2 and R.sub.3 are alike or different and are selected from the group consisting of II and III: ##STR2##

Photopolymerizable compositions containing photoinitiator systems that absorb in the visible are disclosed.

Photopolymerizable compositions which comprise a borate anion, a squarylium sensitizer, and, in the preferred case, a halomethyl triazine are disclosed.

Red sensitive photopolymerizable compositions

Solid photopolymerizable compositions and photosensitive elements are provided that are useful in preparing optical elements, and especially holograms. The compositions contains a polymeric binder, a liquid ethylenically unsaturated monomer, and a photoinitiator system. Typical compositions have a refractive index modulation of at least 0.005 when measured per the specified test.

Photopolymerizable compositions and elements for refractive index imaging

Wavelength response of volume holograms is altered by contact with a dry film diffusion element.

Dry film process for altering wavelength response of holograms

Solid storage stable photopolymerizable compositions are provided that are useful in preparing optical elements, and especially holograms. The composition contains a polymeric binder, N-vinyl carbazole and a photoinitiator system that has a hydrogen donor component.

Storage stable photopolymerizable composition and element for refractive

Holographic notch filters are provided that comprise photopolymer films, having an optical density of at least 2, mounted on a transparent substrate.

Holographic notch filters

Presence of a ring opening monomer in a photopolymerizable composition improves reflection holograms prepared from the composition.

Holographic photopolymer compositions and elements containing a

Optical Combiners are provided for use in Head-Up Displays. The Combiners have a refractive index modulation greater than approximately 0.001.

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Hockessin, DE, United States of America

William K Smothers