US 12,473,382 B2
Hologram recording medium and optical element comprising the same
Hanna Lee, Daejeon (KR); Min Soo Kim, Daejeon (KR); Cheol Jun Song, Daejeon (KR); Sang Pil Moon, Daejeon (KR); Yeonhui Yi, Daejeon (KR); Inkyu Lee, Daejeon (KR); Chulsuk Hong, Daejeon (KR); Hoyong Lee, Daejeon (KR); and Soonhwa Jung, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 18/867,960
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Oct. 11, 2023, PCT No. PCT/KR2023/015579
§ 371(c)(1), (2) Date Nov. 21, 2024,
PCT Pub. No. WO2024/096358, PCT Pub. Date May 10, 2024.
Claims priority of application No. 10-2022-0146043 (KR), filed on Nov. 4, 2022; and application No. 10-2022-0146044 (KR), filed on Nov. 4, 2022.
Prior Publication US 2025/0320317 A1, Oct. 16, 2025
Int. Cl. G11B 7/00 (2006.01); C08F 2/50 (2006.01); C08F 290/06 (2006.01); G11B 7/24044 (2013.01)
CPC C08F 2/50 (2013.01) [C08F 290/06 (2013.01); G11B 7/24044 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A hologram recording medium comprising: a photopolymer layer which includes a polymer matrix formed by crosslinking a siloxane-based polymer containing a silane functional group and a (meth)acrylic-based polyol, or a precursor thereof; a photoreactive monomer and a photoinitiator system or a photopolymer obtained therefrom; and a fluorinated compound,
wherein a refractive index variation calculated by the following Equation 4 is 1.0% or less, and
wherein a haze is 2% or less:

OG Complex Work Unit Math
wherein, in the Equation 4, n0 is a refractive index of a sample in which the hologram recording medium before recording is stored at a temperature of 20 to 25° C. and a relative humidity of 40 to 50% and then bleached with a white LED, and n1 is a refractive index of a sample in which the hologram recording medium before recording is stored at a temperature of 60° C. and a relative humidity of 90% for 72 hours and then bleached with a white LED.