Photopolymer composition

Patent metadata

Field	Value
Publication number	US-11117981-B2
Application number	US-201816326150-A
Country	US
Kind code	B2
Filing date	Jul 2, 2018
Priority date	Jul 17, 2017
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

The present invention relates to a photopolymer composition comprising: a polymer matrix or a precursor thereof including a reaction product of a polyol including a polyrotaxane compound and a compound containing at least one isocyanate group; a photoreactive monomer; and a photoinitiator. The present invention also relates to a hologram recording medium produced from the photopolymer composition, an optical element comprising the hologram recording medium, and a holographic recording method using the photopolymer composition.

First claim

The invention claimed is:

1. A photopolymer composition comprising:
a polymer matrix or a precursor thereof including a reaction product of a polyol and a compound containing at least two isocyanate groups, wherein the polyol includes a polyrotaxane compound comprising a cyclic compound to which a lactone-based compound is bonded, a linear molecule penetrating the cyclic compound, and a blocking group arranged at both ends of the linear molecule, and wherein the blocking group prevents the cyclic compound from escaping;
a photoreactive monomer; and
a photoinitiator,
wherein the compound containing at least two isocyanate groups includes an aliphatic, cycloaliphatic, aromatic or aromatic-aliphatic di-isocyanate, tri-isocyanate or poly-isocyanate; or oligo-isocyanate or poly-isocyanate of diisocyanate or triisocyanate having urethane, urea, carbodiimide, acylurea, isocyanurate, allophanate, biuret, oxadiazinetrione, uretdione or iminooxadiazinedione structures,
wherein the photoreactive monomer includes a polyfunctional (meth)acrylate monomer or a monofunctional (meth)acrylate monomer, and
wherein the polymer matrix or the precursor thereof is present in an amount of 20% to 80% by weight, the photoreactive monomer is present in an amount of 20% to 60% by weight, and the photoinitiator is present in an amount of 0.1% to 15% by weight.

2. The photopolymer composition of claim 1 , wherein the lactone-based compound includes a lactone-based compound having 3 to 12 carbon atoms or a polylactone-based compound containing a lactone-based repeating unit having 3 to 12 carbon atoms.

3. The photopolymer composition of claim 1 , wherein the lactone-based compound is directly bonded to the cyclic compound, or is bonded to the cyclic compound via a linear or branched oxyalkylene group having 1 to 10 carbon atoms.

4. The photopolymer composition of claim 1 ,
wherein the cyclic compound includes at least one selected from the group consisting of α-cyclodextrin, β-cyclodextrin and γ-cyclodextrin,
wherein the linear molecule is a polyoxyalkylene-based compound or a polylactone-based compound, and
wherein the blocking group includes at least one functional group selected from the group consisting of a dinitrophenyl group, a cyclodextrin group, an adamantane group, a trilyl group, a fluorescein group, and a pyrene group.

5. The photopolymer composition of claim 1 , wherein the polyrotaxane compound has a weight average molecular weight of 100,000 to 800,000.

6. The photopolymer composition of claim 1 , wherein the polyol including the polyrotaxane compound further includes at least one selected from the group consisting of aliphatic aromatic diols, triols or polyols having 2 to 20 carbon atoms; alicyclic diols, triols or polyols having from 4 to 30 carbon atoms and aromatic diols, triols or polyols having 6 to 30 carbon atoms.

7. The photopolymer composition of claim 1 , further comprising a photosensitizing dye.

8. A hologram recording medium produced from the photopolymer composition of claim 1 .

9. An optical element comprising the hologram recording medium of claim 8 .

10. A holographic recording method comprising selectively polymerizing photoreactive monomers contained in the photopolymer composition of claim 1 using an electromagnetic radiation.

11. The hologram recording medium of claim 8 , wherein the hologram recording medium has a refractive index modulation value (Δn) of 0.009 or more and a diffraction efficiency of 85% or more at a thickness of 5 μm to 30 μm.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Heon
• Kim Boo Kyung
• Jang Seok Hoon
• Chang Yeong Rae

Classifications

• C08F2/50 Primary

  with sensitising agents · CPC title

• C08F2/48 Primary

  by ultraviolet or visible light · CPC title

• C08F222/1025

  of aromatic dialcohols · CPC title

• C08G83/00

  Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00 · CPC title

• G02B5/32

  Holograms used as optical elements · CPC title