US 12,242,227 B2
Interlayers and encapsulation layers for use with holographic optical elements
Francois Andre Koran, Longmeadow, MA (US); John Joseph D'Errico, Glastonbury, CT (US); and Steven V. Haldeman, Hampden, MA (US)
Assigned to Solutia Inc., St. Louis, MO (US)
Appl. No. 17/596,630
Filed by Solutia Inc., St. Louis, MO (US)
PCT Filed Jul. 24, 2020, PCT No. PCT/US2020/043356
§ 371(c)(1), (2) Date Dec. 15, 2021,
PCT Pub. No. WO2021/021583, PCT Pub. Date Feb. 4, 2021.
Claims priority of provisional application 62/879,115, filed on Jul. 26, 2019.
Prior Publication US 2022/0229395 A1, Jul. 21, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G03H 1/02 (2006.01); B32B 7/023 (2019.01); B32B 17/10 (2006.01)
CPC G03H 1/0252 (2013.01) [B32B 7/023 (2019.01); B32B 17/10036 (2013.01); B32B 17/10633 (2013.01); B32B 17/10651 (2013.01); G03H 1/0248 (2013.01); B32B 2250/05 (2013.01); B32B 2250/40 (2013.01); B32B 2307/418 (2013.01); B32B 2551/00 (2013.01); G03H 2001/0264 (2013.01); G03H 2260/12 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A manufacturing process comprising the steps of:
providing 1) a first polymer layer comprising a low refractive index compound having a refractive index of less than 1.45 and 2) a polymeric volume hologram,
assembling the first polymer layer and the polymeric volume hologram to form an interlayer,
providing at least a first substrate, and
laminating the interlayer with the at least first substrate to form a laminated structure, and
providing a polymer film or tie layer between the first polymer layer and the polymeric volume hologram, wherein the polymer film or tie layer allows one or more of the low refractive index compounds in the polymer interlayer to migrate from the polymer layer into the polymeric volume hologram, from the polymeric volume hologram into the polymer interlayer, or both from the polymer interlayer into the polymeric volume hologram and from the polymeric volume hologram into the polymer interlayer
wherein the first substrate is adjacent the first polymer layer,
wherein the laminated structure has partitioned low refractive index compound levels within the polymeric volume hologram such that the light modification properties of the polymeric volume hologram following lamination and equilibration of the low refractive index compound with the interlayer are greater than 70% of the magnitude of the original light modification properties of the polymeric hologram prior to forming the interlayer in at least one wavelength range,
wherein the initial polymeric volume hologram comprises at least one low refractive index compound, and
wherein the tie layer comprises a concentration of low refractive index compound within a range of −25 to +25 weight percent of the concentration of low refractive index compound in the polymeric volume hologram.