US 12,281,247 B2
Multilayer protective film
Yongzhong Wang, Tucson, AZ (US); Matthew Gacek, Boerne, TX (US); and Tad Bergstresser, Poway, CA (US)
Assigned to SAINT-GOBAIN PERFORMANCE PLASTICS CORPORATION, Solon, OH (US)
Filed by SAINT-GOBAIN PERFORMANCE PLASTICS CORPORATION, Solon, OH (US)
Filed on Dec. 13, 2022, as Appl. No. 18/065,226.
Claims priority of provisional application 63/265,751, filed on Dec. 20, 2021.
Prior Publication US 2023/0193083 A1, Jun. 22, 2023
Int. Cl. C09J 7/25 (2018.01); C09J 7/40 (2018.01); C09J 133/08 (2006.01); C09J 183/04 (2006.01)
CPC C09J 7/255 (2018.01) [C09J 7/403 (2018.01); C09J 133/08 (2013.01); C09J 183/04 (2013.01); C09J 2301/124 (2020.08); C09J 2301/208 (2020.08); C09J 2301/312 (2020.08); C09J 2301/502 (2020.08); C09J 2467/006 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multilayer protective film comprising:
a structural polyethylene terephthalate (PET) layer;
a first removable adhesive layer underlying the structural polyethylene terephthalate (PET) layer;
a first peelable adhesive layer overlying the structural polyethylene terephthalate (PET) layer,
a first flame retardant polyethylene terephthalate (PET) layer overlying the first peelable adhesive layer comprising a flame retardant filler;
a second peelable adhesive layer overlying the first flame retardant polyethylene terephthalate (PET) layer; and
a second flame retardant polyethylene teraphthalate layer overlying the second peelable adhesive layer,
wherein the multilayer protective film has a lateral flame spread of greater than about 20 KW/m2,
wherein the multilayer protective film has a specific optical density (Ds) of not greater than about 300 as tested by ISO 5659-2 (2017), and
wherein the multilayer protective film has a cumulative specific optical density (VOF4) of not greater than about 600 as tested by ISO 5659-2 (2017).