US 11,851,819 B2
Gas barrier film for packaging material
Isabel Knöös, Säffle (SE)
Assigned to Stora Enso OYJ, Helsinki (FI)
Appl. No. 17/295,962
Filed by Stora Enso OYJ, Helsinki (FI)
PCT Filed Nov. 14, 2019, PCT No. PCT/IB2019/059775
§ 371(c)(1), (2) Date May 21, 2021,
PCT Pub. No. WO2020/104900, PCT Pub. Date May 28, 2020.
Claims priority of application No. 1851444-8 (SE), filed on Nov. 22, 2018.
Prior Publication US 2022/0002946 A1, Jan. 6, 2022
Int. Cl. D21H 11/20 (2006.01); C08J 7/043 (2020.01); C08J 7/048 (2020.01); D21H 17/36 (2006.01); D21H 19/56 (2006.01); D21H 21/14 (2006.01); D21H 27/36 (2006.01); D21H 27/16 (2006.01); D21H 27/18 (2006.01)
CPC D21H 11/20 (2013.01) [C08J 7/043 (2020.01); C08J 7/048 (2020.01); D21H 17/36 (2013.01); D21H 19/56 (2013.01); D21H 21/14 (2013.01); D21H 27/16 (2013.01); D21H 27/18 (2013.01); D21H 27/36 (2013.01); C08J 2301/10 (2013.01); C08J 2423/06 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A gas barrier film for a paper or paperboard based packaging material, said gas barrier film comprising:
a microfibrillated cellulose layer (MFC layer), at least one surface of which has been grafted with a fatty acid halide; and
a polymer layer disposed on the at least one surface of the MFC layer which has been grafted with a fatty acid halide.