US 12,072,519 B2
Multilayer optical film
Adam D. Haag, Woodbury, MN (US); William B. Black, Eagan, MN (US); Robert M. Biegler, Woodbury, MN (US); Matthew B. Johnson, Woodbury, MN (US); and Edward J. Kivel, Stillwater, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 17/605,683
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed May 20, 2020, PCT No. PCT/IB2020/054798
§ 371(c)(1), (2) Date Oct. 22, 2021,
PCT Pub. No. WO2020/234808, PCT Pub. Date Nov. 26, 2020.
Claims priority of provisional application 62/852,112, filed on May 23, 2019.
Prior Publication US 2022/0163713 A1, May 26, 2022
Int. Cl. G02B 5/30 (2006.01); B32B 7/02 (2019.01)
CPC G02B 5/305 (2013.01) [B32B 7/02 (2013.01); G02B 5/3083 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A multilayer optical film comprising a plurality of polymeric layers arranged sequentially immediately adjacent to each other, a difference in thickness between spaced apart first and second polymeric layers in the plurality of polymeric layers less than about 10%, the first and second polymeric layers and each polymeric layer disposed between the first and second polymeric layers having a thickness less than about 400 nm, each layer in a group of at least three polymeric layers in the plurality of polymeric layers that are disposed between the first and second polymeric layers having a thickness greater than an average thickness of the first and second polymeric layers by about 50% to about 500%, the group of at least three polymeric layers comprising at least one pair of immediately adjacent polymeric layers, wherein a total number of polymeric layers in the plurality of polymeric layers that are disposed between the first and second polymeric layers is no more than 30.