US 12,253,702 B2
Optical film including infrared reflector and multilayer reflective polarizer with crystalline low index layers
Adam D. Haag, Woodbury, MN (US); Matthew B. Johnson, Woodbury, MN (US); Carl A. Stover, St. Paul, MN (US); and Timothy J. Nevitt, Red Wing, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 17/260,413
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Jul. 9, 2019, PCT No. PCT/IB2019/055837
§ 371(c)(1), (2) Date Jan. 14, 2021,
PCT Pub. No. WO2020/016703, PCT Pub. Date Jan. 23, 2020.
Claims priority of provisional application 62/699,459, filed on Jul. 17, 2018.
Prior Publication US 2021/0302637 A1, Sep. 30, 2021
Int. Cl. G02B 5/08 (2006.01); B29D 11/00 (2006.01); B32B 17/10 (2006.01); G02B 5/20 (2006.01); G02B 5/30 (2006.01); G02B 27/01 (2006.01); G02B 27/28 (2006.01)
CPC G02B 5/305 (2013.01) [B29D 11/0073 (2013.01); B32B 17/10036 (2013.01); B32B 17/10458 (2013.01); B32B 17/10678 (2013.01); G02B 5/205 (2013.01); G02B 5/208 (2013.01); G02B 5/3083 (2013.01); G02B 27/0101 (2013.01); G02B 27/283 (2013.01); B32B 2605/08 (2013.01); G02B 5/0841 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An optical film, comprising:
a reflective polarizer portion; and
an infrared reflector portion disposed on the reflective polarizer portion;
wherein the reflective polarizer portion includes a plurality of alternating first polymer layers and second polymer layers;
wherein for at least one in-plane direction, the difference in refractive index between each of the first polymer layers and the second polymer layers of the reflective polarizer portion is at least 0.04;
wherein for a second in-plane direction orthogonal to the at least one in-plane direction, the difference in refractive index between each of the first polymer layers and the second polymer layers of the reflective polarizer portion is less than 0.04;
wherein the infrared reflector portion includes a plurality of alternating third polymer layers and fourth polymer layers;
wherein the infrared reflector portion exhibits less polarization-sensitive reflection compared to the reflective polarizer portion and transmits less than 50% of normally incident unpolarized light averaged over 900-1200 nm;
wherein there is no adhesive between the reflective polarizer portion and the infrared reflector portion.