# US 11,994,704 B2 · Hologram medium

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- Number: US 11,994,704 B2
- Document ID: US11994704B2
- Status: Granted
- Kind: B2
- Application number: 16/972,547
- Filed: 2019-09-11
- Published: 2021-08-05
- Granted: 2024-05-28
- Earliest claimed: 2018-09-27
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Seokhoon Jang; Jinseok Byun; Heon Kim; Se Hyun Kwon; Yeongrae Chang
- Web page: https://patentgrep.com/patent/US11994704B2

## CPC

- G02B 5/32: Holograms used as optical elements
- G03F 7/0755: {Non-macromolecular compounds containing Si-O, Si-C or Si-N bonds (G03F7/0752 takes precedence)}
- C08L 33/10: Homopolymers or copolymers of methacrylic acid esters
- G03F 7/001: {Phase modulating patterns, e.g. refractive index patterns}
- G03F 7/0046: {with perfluoro compounds, e.g. for dry lithography (G03F7/0048 takes precedence)}
- G03F 7/027: Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds (G03F7/075 takes precedence)
- G03F 7/033: the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
- G03F 7/035: the binders being polyurethanes
- G03F 7/075: Silicon-containing compounds
- G03H 2001/0264: {Organic recording material}
- G03H 2260/12: Photopolymer
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G03F: PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; (phototypographic composing devices B41B; photosensitive materials or processes for photographic purposes G03C; electrophotography, sensitive layers or processes therefor G03G)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- G03H: HOLOGRAPHIC PROCESSES OR APPARATUS (holograms, e.g. point holograms, used as ordinary optical elements G02B5/32; producing stereoscopic or other three-dimensional effects G02B30/00; diffraction-grating systems G02B27/44; systems using moiré fringes G02B27/60; optical logic elements G02F3/00; stereo-photography G03B35/00; photosensitive materials or processes for photographic purposes G03C; {stereo-photographic or similar processes G03C9/00}; apparatus for processing exposed photographic materials G03D; analogue computers performing mathematical operations with the aid of optical elements G06E3/00; authentication by radiation, of concealed information carried by holograms or diffraction gratings G06K19/16; holographic storage G11B7/0065, G11C13/04; {stereoscopic or other three dimensional effects in television systems H04N13/00})

## Abstract

The present disclosure relates to a hologram recording medium having one surface with a higher surface energy than a polymer resin layer containing at least one polymer selected from the group consisting of triacetyl cellulose, alicyclic olefin polymer and polyethylene terephthalate, a hologram recording medium wherein the surface energy of any one surface is 50 mN/m or more, and an optical element comprising the hologram medium.

## Claims

### Claim 1

A hologram recording medium having one surface with a higher surface energy than a polymer resin layer of a base substrate containing at least one polymer selected from the group consisting of triacetyl cellulose, alicyclic olefin polymer and polyethylene terephthalate,
wherein the hologram recording medium has one surface with a surface energy of at least 50 mN/m,
wherein the hologram recording medium comprises a polymer layer which
includes a cross-linked product between a polymer matrix including a (meth)acrylate-based (co)polymer having a silane-based functional group in a branched chain, and a silane crosslinking agent; and a photoreactive monomer.

### Claim 2 (depends on 1)

The hologram recording medium according to claim 1, wherein the one surface of the hologram recording medium has a surface energy of 501 mN/m to 60 mN/m.

### Claim 3 (depends on 1)

The hologram recording medium according to claim 1, wherein a fine pattern is for reed on a surface of the polymer layer that is the other surface of the hologram recording medium.

### Claim 4 (depends on 3)

The hologram recording medium according to claim 3, wherein the fine pattern has a shape including two or more fine protrusions in which a maximum value of the height and minimum value of the height are alternately repeated based on the cross section of the polymer layer, and
a standard error of the distance in the cross-sectional direction of the polymer layer between the maximum value of the height of the one fine protrusion and the minimum value of the height of the adjacent fine protrusion is 20 nm or less.

### Claim 5 (depends on 4)

The hologram recording medium according to claim 4, wherein the distance in the cross-sectional direction of the polymer layer between the maximum value of the height of the one fine projection and the minimum value of the adjacent fine projection is 0.2 μm to 2 μm.

### Claim 6 (depends on 4)

The hologram recording medium according to claim 4, wherein an amplitude which is a difference between the maximum value of the height of the one fine projection and the minimum value of the height of the adjacent fine projection is 5 to 50 nm.

### Claim 7 (depends on 1)

The hologram recording medium according to claim 1, wherein the polymer matrix includes 10 parts by weight to 90 parts by weight of the silane crosslinking agent based on 100 parts by weight of the (meth)acrylate-based (co)polymer.

### Claim 8 (depends on 1)

The hologram recording medium according to claim 1, wherein the (meth)acrylate-based (co)polymer having a silane-based functional group in a branched chain has an equivalent weight of the silane-based functional group of 300 g/eq. to 2000 g/eq.

### Claim 9 (depends on 1)

The hologram recording medium according to claim 1, wherein the silane crosslinking agent includes a linear polyether main chain having a weight average molecular weight of 100 to 2000 and a silane-based functional group bonded to the terminal or branched chain of the main chain.

### Claim 10 (depends on 1)

The hologram recording medium according to claim 1, wherein the polymer layer further includes a fluorine-based compound including at least one functional group selected from the group consisting of an ether group, an ester group and an amide group, and at least two difluoromethylene groups.

### Claim 11 (depends on 1)

An optical element comprising the hologram medium of claim 1 having a hologram recorded therein.