US 12,404,426 B2
Masking film with improved adhesion stability
Ricky Santoso, Glen Allen, VA (US); and Kevin A. Brady, Cary, IL (US)
Assigned to TREDEGAR SURFACE PROTECTION, LLC, N. Chesterfield, VA (US)
Filed by TREDEGAR SURFACE PROTECTION, LLC, N. Chesterfield, VA (US)
Filed on Feb. 17, 2021, as Appl. No. 17/177,609.
Claims priority of provisional application 62/978,602, filed on Feb. 19, 2020.
Prior Publication US 2021/0253911 A1, Aug. 19, 2021
Int. Cl. C09J 7/29 (2018.01); C08K 5/00 (2006.01); C08K 5/01 (2006.01); C08L 23/06 (2006.01); C09J 7/20 (2018.01); C09J 7/24 (2018.01); C09J 7/25 (2018.01); C09J 7/40 (2018.01); C09J 109/06 (2006.01); C09J 123/06 (2006.01); C09J 123/08 (2006.01); C09J 125/10 (2006.01); C09J 153/02 (2006.01)
CPC C09J 7/29 (2018.01) [C08K 5/005 (2013.01); C08K 5/01 (2013.01); C08L 23/06 (2013.01); C09J 7/201 (2018.01); C09J 7/241 (2018.01); C09J 7/243 (2018.01); C09J 7/245 (2018.01); C09J 7/25 (2018.01); C09J 7/401 (2018.01); C09J 109/06 (2013.01); C09J 123/06 (2013.01); C09J 123/0815 (2013.01); C09J 125/10 (2013.01); C09J 153/025 (2013.01); C08L 2205/025 (2013.01); C08L 2205/03 (2013.01); C08L 2207/062 (2013.01); C08L 2207/066 (2013.01); C08L 2666/78 (2013.01); C09J 2301/162 (2020.08); C09J 2301/312 (2020.08); C09J 2301/314 (2020.08); C09J 2301/408 (2020.08); C09J 2409/00 (2013.01); C09J 2423/00 (2013.01); C09J 2423/005 (2013.01); C09J 2423/006 (2013.01); C09J 2423/045 (2013.01); C09J 2423/046 (2013.01); C09J 2423/105 (2013.01); C09J 2423/106 (2013.01); C09J 2431/005 (2013.01); C09J 2431/006 (2013.01); C09J 2453/00 (2013.01); C09J 2477/005 (2013.01); C09J 2477/006 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A masking film for protecting a substrate, the masking film comprising:
a release layer comprising at least one polyolefin, low density polyethylene, linear low density polyethylene, high density polyethylene, medium density polyethylene, polypropylene, random copolymer polypropylene, polypropylene impact copolymers, metallocene linear low density polyethylene, plastomers, poly(ethylene-co-vinyl acetate), poly(ethylene-co-acrylic acid), poly(ethylene-co-methyl acrylate), cyclic olefin polymers, polyamides, poly (ethylene-co-n-butyl acrylate), and mixtures thereof;
a core layer comprising at least one polyolefin, low density polyethylene, linear low density polyethylene, high density polyethylene, medium density polyethylene, polypropylene, random copolymer polypropylene, polypropylene impact copolymers, metallocene linear low density polyethylene, plastomers, poly(ethylene-co-vinyl acetate), poly(ethylene-co-acrylic acid), poly(ethylene-co-methyl acrylate), cyclic olefin polymers, polyamides, poly(ethylene-co-n-butyl acrylate), and mixtures thereof; and
an adhesion layer comprising 50% to 100% by weight of at least one hydrogenated styrene block copolymer;
wherein the core layer is between the release layer and the adhesion layer;
wherein the release layer has a release layer thickness between about 1 μm and about 20 μm;
wherein the core layer has a core layer thickness between about 10 μm and about 50 μm;
wherein the adhesion layer has an adhesion layer thickness between about 1 μm and about 20 μm;
wherein the adhesion layer comprises an adhesive surface having a surface roughness (Sa) of greater than about 2.0 μm; and
wherein an Adhesion Build Value of the masking film is less than about 2.0 after the adhesion layer has been attached to a textured polycarbonate substrate and heated to 85° C. for 30 minutes and a peel force is less than about 50 grams/inch (19.69 g/cm).