US 12,186,962 B2
Process for obtaining a metal-free coextruded bi-oriented of 7 layers film for packaging by triple-bubble process used for sterilization processes up to 135° C
Miguel Jorge Zubiria Elizondo, Monterrey (MX); Gabriel Santos Ruiz, Queretaro (MX); and Juan Jose Valadez Lopez, Apodaca (MX)
Assigned to ZUBEX INDUSTRIAL SA DE CV, Monterrey (MX)
Filed by ZUBEX INDUSTRIAL SA DE CV, Monterrey (MX)
Filed on Dec. 16, 2021, as Appl. No. 17/553,316.
Claims priority of application No. MX/a/2021/010873 (MX), filed on Sep. 8, 2021.
Prior Publication US 2023/0073804 A1, Mar. 9, 2023
Int. Cl. B32B 27/34 (2006.01); B29C 48/00 (2019.01); B29C 48/10 (2019.01); B29C 48/21 (2019.01); B32B 1/08 (2006.01); B32B 27/08 (2006.01); B32B 27/18 (2006.01); B32B 27/30 (2006.01); B32B 27/32 (2006.01); B29K 23/00 (2006.01); B29K 105/00 (2006.01)
CPC B29C 48/022 (2019.02) [B29C 48/0018 (2019.02); B29C 48/10 (2019.02); B29C 48/21 (2019.02); B32B 1/08 (2013.01); B32B 27/08 (2013.01); B32B 27/18 (2013.01); B32B 27/306 (2013.01); B32B 27/32 (2013.01); B32B 27/34 (2013.01); B29K 2023/12 (2013.01); B29K 2105/0097 (2013.01); B32B 2250/05 (2013.01); B32B 2250/24 (2013.01); B32B 2307/518 (2013.01); B32B 2307/7244 (2013.01); B32B 2307/7246 (2013.01); B32B 2439/70 (2013.01); B32B 2597/00 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A 7-layers co-extruded bi-oriented film for a food package, the 7-layers co-extruded bi-oriented film comprising:
a first layer made of polypropylene;
a second layer made of polypropylene adjacent to the first layer;
a third layer made of polypropylene adjacent to the second layer;
a fourth layer made of at least one adhesive and at least one additive;
a fifth layer made of polyamide adjacent to the fourth layer;
a sixth layer made of ethylene-vinyl-alcohol (EVOH), the sixth layer adjacent to the fifth layer; and
a seventh layer made of polyamide adjacent to the sixth layer;
wherein the adhesive has a flow index between 2.0 and 4.0 g/10 min and consists of n-butane and maleic anhydride;
wherein the additive is cristobalite;
wherein the 7-layers co-extruded bi-oriented film comprises 40 to 59% weight of the polyamide, 30 to 40% weight of the polypropylene, 8 to 10% weight of the ethylene-vinyl-alcohol (EVOH), 5 to 7% weight of the at least one adhesive and the at least one additive;
wherein the film includes a first side and a second side opposite to the first side;
wherein the first layer is located on the first side of the film and the seventh layer is located on the second side of the film;
wherein the film is free of metals.
 
11. A 7-layers co-extruded bi-oriented film for a food package, the 7-layers co-extruded bi-oriented film consisting of:
a first layer made of polypropylene;
a second layer made of polypropylene adjacent to the first layer;
a third layer made of polypropylene adjacent to the second layer;
a fourth layer made of at least one adhesive and at least one additive;
a fifth layer made of polyamide adjacent to the fourth layer;
a sixth layer made of ethylene-vinyl-alcohol (EVOH), the sixth layer adjacent to the fifth layer; and
a seventh layer made of polyamide adjacent to the sixth layer;
wherein the adhesive has a flow index between 2.0 and 4.0 g/10 min and is selected from the group consisting of n-butane and maleic anhydride;
wherein the additive is cristobalite;
wherein the 7-layers co-extruded bi-oriented film comprises 40 to 59% weight of the polyamide, 30 to 40% weight of the polypropylene, 8 to 10% weight of the ethylene-vinyl-alcohol (EVOH), 5 to 7% weight of the at least one adhesive and the at least one additive;
wherein the film includes a first side and a second side opposite to the first side;
wherein the first layer is located on the first side of the film and the seventh layer is located on the second side of the film;
wherein the film is free of metals.