Covestro Deutschland Ag

Bayer Intellectual Property Gmbh

Christian Diedrich

Friedrich-Karl Bruder

Thomas Fäcke

Dennis Hönel

Marc-Stephan Weiser

Horst Berneth

Thomas Rölle

Thomas Roelle

Rainer Hagen

Günther Walze

The invention relates to a method for selecting compounds which can be used as additives in photopolymer formulations for producing light holographic media, and to photopolymer formulations which contain at least one softener which are selected according to the claimed method. The invention also relates to the use of photopolymer formulations for producing holographic media.

Selection method for additives in photopolymers

The present invention provides a novel photopolymer formulation comprising matrix polymers, writing monomer and a photoinitiator and further comprising a compound of formula (1) where A, Aand Aare each independently hydrogen, fluorine, chlorine, bromine or iodine, R, R, R, Rand Rare each independently hydrogen, halogen, cyano, nitro, amino, alkylimino, azide, isonitrile, enamino, formyl, acyl, carboxyl, carboxylate, carboxamide, orthoester, sulphonate, phosphate, organosulphonyl, organosulphoxidyl, optionally fluorinated alkoxy or an optionally substituted aromatic, heteroaromatic, aliphatic, araliphatic, olefinic or acetylenic radical while suitable radicals may be connected together via bridge of any desired substitution, or in that two or more compounds of formula (I) may be connected together via at least one of the radicals R, R, R, Rand R, in which case these radicals therein constitute a 2- to 4-tuply functional bridge, with the proviso that at least one of the radicals R, R, R, Rand Ris not hydrogen. Further subjects of the invention are a photopolymer comprising matrix polymers, a writing monomer and photoinitiator, a holographic medium comprising a photopolymer formulation of the present invention or being obtainable by use thereof, the use of a holographic medium of the present invention and also a process for producing a holographic medium by using a photopolymer formulation of the present invention.

Holographic media with improved light sensitivity

The invention relates to a method of selecting photoinitiator systems comprising at least one sensitizer and at least one coinitiator, for photopolymer formulations for producing holographic media.

Method for selecting photoinitiator systems

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Düsseldorf, Germany

Christian Diedrich