US 12,404,429 B2
Protective film
Daiki Fukuda, Tokyo (JP)
Assigned to LINTEC Corporation, Tokyo (JP)
Filed by LINTEC Corporation, Tokyo (JP)
Filed on Mar. 21, 2023, as Appl. No. 18/124,142.
Claims priority of application No. 2022-052063 (JP), filed on Mar. 28, 2022.
Prior Publication US 2023/0303893 A1, Sep. 28, 2023
Int. Cl. C09J 7/40 (2018.01); B32B 7/12 (2006.01); B32B 27/08 (2006.01); B32B 27/30 (2006.01); B32B 27/32 (2006.01); B32B 27/36 (2006.01); B32B 27/40 (2006.01); C09J 5/00 (2006.01); C09J 7/20 (2018.01); C09J 7/24 (2018.01); C09J 7/25 (2018.01); C09J 7/38 (2018.01); B32B 27/20 (2006.01); G02F 1/1333 (2006.01)
CPC C09J 7/403 (2018.01) [B32B 7/12 (2013.01); B32B 27/304 (2013.01); B32B 27/40 (2013.01); C09J 5/00 (2013.01); C09J 7/203 (2018.01); C09J 7/245 (2018.01); C09J 7/25 (2018.01); C09J 7/38 (2018.01); B32B 27/08 (2013.01); B32B 27/20 (2013.01); B32B 27/32 (2013.01); B32B 27/36 (2013.01); B32B 2250/24 (2013.01); B32B 2255/10 (2013.01); B32B 2255/26 (2013.01); B32B 2307/518 (2013.01); B32B 2307/54 (2013.01); B32B 2307/7376 (2023.05); B32B 2307/748 (2013.01); B32B 2405/00 (2013.01); C09J 2203/326 (2013.01); C09J 2301/302 (2020.08); C09J 2427/006 (2013.01); C09J 2475/006 (2013.01); G02F 1/133331 (2021.01); G02F 2202/28 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A protective film comprising:
a release liner;
a pressure sensitive adhesive layer;
a base material film; and
a cap film,
laminated in this order in a thickness direction thereof, wherein
the base material film contains polyurethane or poly(vinyl chloride),
the cap film is releasable from the protective film after the release liner has been released and removed from the protective film and the protective film is attached to an adherend,
identification information is printed on an opposite side, of the cap film, from the base material film,
the base material film has a modulus of elasticity in tension at 23° C. of 10 to 1500 MPa,
the cap film has a modulus of elasticity in tension at 23° C. of 2000 to 7000 MPa,
the release liner is whitening-treated, and
the pressure sensitive adhesive layer, the base material film and the cap film are transparent.