US 11,752,729 B2
Conformable color shifting laminates
Huiwen Tai, Lake Elmo, MN (US); Joan M. Frankel, Woodbury, MN (US); Stephen P. Maki, North St. Paul, MN (US); Diane North, Inver Grove Heights, MN (US); and Robert R. Owings, Woodbury, MN (US)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/260,459
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Jul. 15, 2019, PCT No. PCT/IB2019/056033
§ 371(c)(1), (2) Date Jan. 14, 2021,
PCT Pub. No. WO2020/016753, PCT Pub. Date Jan. 23, 2020.
Claims priority of provisional application 62/699,337, filed on Jul. 17, 2018.
Prior Publication US 2021/0308984 A1, Oct. 7, 2021
Int. Cl. G02B 5/08 (2006.01); B32B 7/023 (2019.01); B32B 7/022 (2019.01); B32B 7/12 (2006.01); B32B 15/08 (2006.01); B32B 15/20 (2006.01); B32B 27/06 (2006.01); G02B 5/26 (2006.01)
CPC B32B 7/023 (2019.01) [B32B 7/022 (2019.01); B32B 7/12 (2013.01); B32B 15/08 (2013.01); B32B 15/20 (2013.01); B32B 27/06 (2013.01); G02B 5/085 (2013.01); G02B 5/0875 (2013.01); G02B 5/26 (2013.01); B32B 2307/404 (2013.01); B32B 2307/412 (2013.01); B32B 2307/414 (2013.01); B32B 2307/416 (2013.01); B32B 2307/54 (2013.01); B32B 2307/732 (2013.01); G02B 5/0866 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A stretchable reflective color-shifting film comprising:
a stretchable transparent polymer layer;
a semi-transmissive metal layer;
a transparent spacer layer;
a reflective metal layer;
an adhesive layer; and
a stretchable base film layer;
wherein when the film body is stretched by 25%, the peak total reflectance when stretched is at 80% of the peak total reflectance when the film body is unstretched according to the Total Reflectivity Test, wherein when the film body is stretched by 25%, the peak specular reflection is at least 30% at a normal angle.