Moisture-stable holographic media
AssigneeCovestro Deutschland AG
InventorsThomas FÄCKE, Friedrich-Karl BRUDER, Thomas RÖLLE, Dennis HÖNEL
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Abstract
The invention relates to novel compounds which are especially suitable for use as writing monomers in holographic media. The invention further provides a photopolymer and a holographic medium comprising the inventive compounds, and an optical display, a security document and a holographic optical element comprising an inventive holographic medium.
Claims16
1-15. (canceled)
A photopolymer comprising matrix polymers, writing monomers and photoinitiators, wherein the writing monomers comprise compound of formula (I)
- in which
- R1 is an aliphatic hydrocarbyl radical having 1-8 carbon atoms;
- R2 is hydrogen or methyl;
- Ar is an aromatic radical of the formula (II)
- in which
- R3 are independently radicals selected from the group of substituted or unsubstituted phenyl, substituted or unsubstituted phenylthiyl, branched or unbranched alkyl, branched or unbranched alkylthiyl, halogen, where at least one of the R3 radicals is a radical selected from the group of substituted or unsubstituted phenyl, substituted or unsubstituted phenylthiyl;
- n=1 or 5;
- or Ar is an aromatic radical of the formula (III)
- in which
- R3 are independently radicals selected from the group of substituted or unsubstituted phenyl, substituted or unsubstituted phenylthiyl, branched or unbranched alkyl, branched or unbranched alkylthiyl, halogen, where at least one of the R3 radicals is a radical selected from the group of substituted or unsubstituted phenyl, substituted or unsubstituted phenylthiyl;
- o=1 or 3;
- p=1 to 4,
- wherein the compound of the formula (I) has only one radiation-curing group.
A compound of the formula (I′)
- in which
- R1 is an aliphatic hydrocarbyl radical having 1-8 carbon atoms;
- R2 is hydrogen or methyl;
- Ar is an aromatic radical of the formula (II′)
- in which
- R3′ are independently radicals selected from the group of unsubstituted phenyl, substituted or unsubstituted phenylthiyl, branched or unbranched alkyl, branched or unbranched alkylthiyl, halogen, where at least one of the R3′ radicals is a radical selected from the group of substituted or unsubstituted phenyl, substituted or unsubstituted phenylthiyl;
- n=1 to 5;
- or Ar is an aromatic radical of the formula (III)
- in which
- R3 are independently radicals selected from the group of substituted or unsubstituted phenyl, substituted or unsubstituted phenylthiyl, branched or unbranched alkyl, branched or unbranched alkylthiyl, halogen, where at least one of the R3 radicals is a radical selected from the group of substituted or unsubstituted phenyl, substituted or unsubstituted phenylthiyl;
- o=1 to 3;
- p=1 to 4,
- wherein the compound of the formula (I′) has only one radiation-curing group.
A method comprising utilizing the compound of the formula (I) as writing monomer in photopolymers, holographic media and/or holographic optical elements.
Dependencies are inferred from the claim text.