US 12,297,030 B2
Recyclable film and packaging
Thomas A. Schell, Neenah, WI (US)
Assigned to AMCOR FLEXIBLES NORTH AMERICA, INC., Neenah, WI (US)
Appl. No. 17/609,043
Filed by AMCOR FLEXIBLES NORTH AMERICA, INC., Neenah, WI (US)
PCT Filed May 17, 2019, PCT No. PCT/US2019/032917
§ 371(c)(1), (2) Date Nov. 5, 2021,
PCT Pub. No. WO2020/236140, PCT Pub. Date Nov. 26, 2020.
Prior Publication US 2022/0194681 A1, Jun. 23, 2022
Int. Cl. B65D 81/34 (2006.01); B32B 27/08 (2006.01); B32B 27/18 (2006.01); B32B 27/32 (2006.01); B32B 27/34 (2006.01); B65D 65/40 (2006.01); B65D 75/00 (2006.01)
CPC B65D 81/34 (2013.01) [B32B 27/08 (2013.01); B32B 27/18 (2013.01); B32B 27/32 (2013.01); B32B 27/34 (2013.01); B65D 65/40 (2013.01); B32B 2307/308 (2013.01); B32B 2307/31 (2013.01); B32B 2307/4023 (2013.01); B32B 2307/514 (2013.01); B32B 2439/70 (2013.01); B65D 75/008 (2013.01)] 14 Claims
 
1. A recyclable film comprising:
a) a base film comprising:
i) a first polar layer comprising a polar polymer, and
ii) a compatibilizer layer comprising a blend of polypropylene and a low molecular weight anhydride or carboxylic acid functionalized polypropylene,
b) an unoriented sealant, and
c) a barrier layer selected from the group consisting of ethylene vinyl alcohol copolymer located in the base film or in the unoriented sealant, metalization located between the base film and the unoriented sealant, and a barrier coating located between the base film and the unoriented sealant, and
d) optionally, printed indicia located between the base film and the unoriented sealant, and wherein the base film is oriented and annealed such that the base film has a free shrink value of less than 10% in both the machine direction and the transverse direction when tested according to ASTM D2732 using bath temperature of 90° C., and
wherein the recyclable film has an oxygen transmission rate from about 0.16 to 1.6 cc/m2/day when tested at 23° C., and
wherein the recyclable film is recyclable in a polypropylene waste stream.