US 12,304,133 B2
Conformable shielding film
Sara Hemmer Frisco, Blaine, MN (US); Guy M. Kallman, Woodbury, MN (US); Kristal L Schutta, Forest Lake, MN (US); and Thomas B. Stirling, White Bear Lake, MN (US)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/260,646
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Jul. 15, 2019, PCT No. PCT/IB2019/056037
§ 371(c)(1), (2) Date Jan. 15, 2021,
PCT Pub. No. WO2020/016757, PCT Pub. Date Jan. 23, 2020.
Claims priority of provisional application 62/700,524, filed on Jul. 19, 2018.
Prior Publication US 2021/0394427 A1, Dec. 23, 2021
Int. Cl. B29C 51/14 (2006.01); B29C 51/10 (2006.01); B32B 27/08 (2006.01); B32B 27/30 (2006.01); B32B 27/36 (2006.01); B29K 33/00 (2006.01); B29K 67/00 (2006.01); B29K 69/00 (2006.01); B29L 11/00 (2006.01); G02B 5/02 (2006.01)
CPC B29C 51/14 (2013.01) [B29C 51/10 (2013.01); B32B 27/08 (2013.01); B32B 27/304 (2013.01); B32B 27/308 (2013.01); B32B 27/365 (2013.01); B29K 2033/12 (2013.01); B29K 2067/003 (2013.01); B29K 2069/00 (2013.01); B29K 2995/0029 (2013.01); B29L 2011/00 (2013.01); B32B 2250/03 (2013.01); B32B 2250/24 (2013.01); B32B 2307/414 (2013.01); B32B 2307/732 (2013.01); B32B 2551/00 (2013.01); G02B 5/0268 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of thermoforming a rigid film construction, comprising:
applying a rigid film construction to a mold; and
heating the rigid film construction until it conforms to the mold;
wherein the rigid film construction comprises:
a rigid polymeric film layer having a thickness of approximately 1 mm to 5 mm;
a light-modifying film layer; and
a shielding film layer,
wherein the shielding film comprises polymethyl methacrylate (PMMA); and
wherein the shielding film layer contacts a convex surface of the mold.