An optical information storage medium includes a substrate and a multilayer polymeric film. The multilayer polymeric film has a first surface and an opposite second surface that extend the length of the multilayer polymeric film. The second surface is adhered to a surface of the substrate. The multilayer polymeric film includes a plurality of coextruded alternating polymeric active data storage layers and polymeric buffer layers.

The present disclosure relates to a photopolymer composition including: a polymer matrix or a precursor thereof; a photoreactive monomer including a polyfunctional (meth)acrylate monomer having a refractive index of 1.5 or less and a viscosity at 25° C. of 100 cps or less, and a monofunctional (meth)acrylate monomer having a refractive index of 1.5 or more; and a photoinitiator, wherein a content of the monofunctional (meth)acrylate monomer having a refractive index of 1.5 or more in the photoreactive monomer is 60 wt % or more. The present disclosure also relates to a hologram recording medium produced from the photopolymer composition, an optical element including the hologram recording medium, and a holographic recording method using the photopolymer composition.

The present disclosure relates to a photopolymer composition for hologram production comprising a polymer matrix or a precursor thereof having a glass transition temperature of 80° C. or less; a photoreactive monomer; a low refractive index fluorine-based compound; and a photoinitiator, a hologram recording medium produced from the photopolymer composition, an optical element comprising the hologram recording medium, and a holographic recording method using the hologram recording medium.

The invention relates to a protective layer comprising a photopolymer layer B and and an at least partly cured protective layer C, to a process for producing the layer construction according to the invention, to a kit of parts, to the use of an at least partly cured protective layer C for protection of a photopolymer layer B and to optical displays and security documents comprising the layer construction according to the invention.

The disclosure belongs to the technical field of photopolymer materials, and more particularly relates to a dual image storage material as well as a preparation method and application thereof. The dual image storage material is obtained by selective photoreaction of 1 to 50 parts by weight of an organic fluorescent material, 7 to 50 parts by weight of liquid crystal, 0.2 to 10 parts by weight of a photoinitiator and 33 to 67 parts by weight of photopolymerizable monomers. The obtained dual image storage material can present a high-brightness holographic pattern under sunlight and a fluorescent pattern under ultraviolet light in the same spatial position. The presented holographic and fluorescent patterns may be the same or different. The obtained dual image storage material can be used in the field of optical anti-counterfeiting, optical information storage, displays or the like.

Nucleic acid memory strands encoding digital data using a sequence of homopolymer tracts of repeated nucleotides provides a cheaper and faster alternative to conventional digital DNA storage techniques. The use of homopolymer tracts allows for lower fidelity, high throughput sequencing techniques such as nanopore sequencing to read data encoded in the memory strands. Specialized synthesis techniques allow for synthesis of long memory strands capable of encoding large volumes of data despite the reduced data density afforded by homopolymer tracts as compared to conventional single nucleotide sequences.

Nucleic acid memory strands encoding digital data using a sequence of homopolymer tracts of repeated nucleotides provides a cheaper and faster alternative to conventional digital DNA storage techniques. The use of homopolymer tracts allows for lower fidelity, high throughput sequencing techniques such as nanopore sequencing to read data encoded in the memory strands. Specialized synthesis techniques allow for synthesis of long memory strands capable of encoding large volumes of data despite the reduced data density afforded by homopolymer tracts as compared to conventional single nucleotide sequences.

Providing a compound that can realize an organic material with an enhanced function.

Provided is a compound represented by the following general formula (1).

##STR00001##

(In the general formula (1), R.sup.101 to R.sup.104 are each independently a univalent substituent group represented by the following general formula (2-1), i to 1 are each independently an integer of 0 or 1, provided that i to 1 are not simultaneously 0.)

##STR00002##

(In the general formula (2-1), R.sup.203 and R.sup.204 are each independently a single bond or a straight chain or branched substituted or unsubstituted alkylene group represented by C.sub.nH.sub.2n (n is an integer of equal to or greater than 1), R.sup.205 is hydrogen or a straight chain or branched substituted or unsubstituted alkyl group represented by C.sub.nH.sub.2n+1 (n is an integer of equal to or greater than 1). Represented by k is an integer of equal to or greater than 1, and X is a bivalent or more-valent aromatic group. If carbon not bonded to R.sup.203 and R.sup.204 is present in the bivalent or more-valent aromatic group, the carbon is unsubstituted or has at least one substituent group. In addition, a part for bonding to R.sup.203 and at least one part for bonding to R.sup.204, possessed by the bivalent or more-valent aromatic group, may be any bondable carbon in the aromatic group. Represented by * in R.sup.101 to R.sup.102 is a part for bonding with carbon that is bondable in a benzene ring condensed with a thiophene ring in the general formula (1). Represented by * in R.sup.103 to R.sup.104 is a part for bonding with carbon that is bondable in the benzene ring not condensed with the thiophene ring in the general formula (1).)

A holographic recording medium composition contains an isocyanate group-containing compound (component (a-1)), an isocyanate-reactive functional group-containing compound (component (b-1)), a polymerizable monomer (component (c-1)), a photopolymerization initiator (component (d-1)), and a stable nitroxyl radical group-containing compound (component (e-1)). A ratio of the total weight of a propylene glycol unit and a tetramethylene glycol unit that are contained in the component (b-1) to the total weight of the component (a-1) and the component (b-1) is 30% or less.

A holographic recording medium composition contains an isocyanate group-containing compound (component (a-1)), an isocyanate-reactive functional group-containing compound (component (b-1)), a polymerizable monomer (component (c-1)), a photopolymerization initiator (component (d-1)), and a stable nitroxyl radical group-containing compound (component (e-1)). A ratio of the total weight of a propylene glycol unit and a tetramethylene glycol unit that are contained in the component (b-1) to the total weight of the component (a-1) and the component (b-1) is 30% or less.