	US 12,109,784 B2
	Polymer coating layers for use with holographic optical elements
Francois Andre Koran, Longmeadow, MA (US); and Steven V. Haldeman, Hampden, MA (US)
Assigned to Solutia Inc., St. Louis, MO (US)
Appl. No. 17/596,631
Filed by Solutia Inc., St. Louis, MO (US)
PCT Filed Jul. 24, 2020, PCT No. PCT/US2020/043357 § 371(c)(1), (2) Date Dec. 15, 2021, PCT Pub. No. WO2021/021584, PCT Pub. Date Feb. 4, 2021.
Claims priority of provisional application 62/879,123, filed on Jul. 26, 2019.
Prior Publication US 2022/0161525 A1, May 26, 2022
Int. Cl. B32B 17/10 (2006.01)

CPC B32B 17/10935 (2013.01) [B32B 17/10036 (2013.01); B32B 17/1044 (2013.01); B32B 17/10605 (2013.01); B32B 17/10633 (2013.01); B32B 17/10651 (2013.01); B32B 17/10761 (2013.01); B32B 17/1077 (2013.01)]

17 Claims

1. A manufacturing process comprising the steps of: providing a first polymer layer, a tie layer comprising a low refractive index compound, and a polymeric volume hologram, assembling the first polymer layer, the tie layer and the polymeric volume hologram to form an assembly, providing at least a first substrate wherein the first substrate is adjacent the first polymer layer, and laminating the assembly with the at least first substrate to form a laminated structure, 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 low refractive index compound equilibration with the tie layer are greater than 70% of the magnitude of the original light modification properties of the polymeric hologram prior to assembly, 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.