IP Library › Granted Patent US 12,397,534
Granted Patent B2
US 12,397,534 · App. 17/923,557 · Granted Aug 26, 2025

Heat resistant recycle-ready retort packaging

Inventors: Helmar Utz (Koppigen, CH); Roy Christopherson (Shrivenham, GB); Sara Menghetti (Cecina, IT); Florian Chapalain (Marcq-en-Baoeul, FR); Peter Ettridge (Worcester, GB)
Assignee: AMCOR FLEXIBLES NORTH AMERICA, INC.
B32B27/32B32B7/12B32B27/08B65D65/40B65D75/008C08J5/124C08J7/048C08J7/06B32B2250/242B32B2255/10B32B2255/20B32B2255/26B32B2307/306B32B2307/31B32B2307/518B32B2307/7244B32B2439/46C08J2323/12C08J2475/04
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Quick Facts
Patent No.
US 12,397,534
App. No.
17/923,557
Granted
Aug 26, 2025
Kind
B2
Abstract

A laminated polypropylene-based film suitable for retort packaging having an exterior film, a barrier layer, and a sealing layer. The retort packaging film has a total composition including high levels of polyolefin-based polymers and polypropylene-based polymers such that the material can be processed efficiently in a polypropylene recycling process. Advantageously, the film retains the properties required to suitably withstand the retort process and produce a high-quality shelf-stable packaged product.

Claims (12)

1. A retort packaging film comprising:

an exterior polypropylene-based film,

an interior polypropylene-based film,

a barrier layer comprising a metal oxide deposited on at least one surface of the interior and exterior polypropylene-based film,

a multilayer film comprising a sealing layer comprising a polypropylene copolymer having a melt temperature less than or equal to 135° C.,

wherein the retort packaging film has a total composition comprising at least 80% polypropylene-based polymers, by weight.

2. The retort packaging film according to claim 1 , wherein at least one of the interior or exterior polypropylene-based films is oriented.

3. A retort package formed from one or more of the retort packaging films according to claim 1 .

4. A retort package comprising a retort packaging film comprising at least 88% polyolefin-based materials by weight, wherein the retort package comprises a heat seal comprising a polypropylene copolymer having a melt temperature less than or equal to 135° C. and a barrier layer comprising an inorganic oxide.

5. The retort package according to claim 4 wherein the retort packaging film has an oxygen transmission rate of less than 2.0 cm 3 /m 2 day (ASTM F1927, 23C, 50% Rh).

6. The retort package according to claim 4 wherein the retort packaging film has an oxygen transmission rate of less than 1.0 cm 3 /m 2 day (ASTM F1927, 23C, 50% Rh).

7. The retort packaging according to claim 4 wherein the retort package essentially comprises one or more retort packaging films, each comprising at least 80% polypropylene-based materials by weight, and at least one heat seal.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 4, 2022
From: UTZ, HELMAR; CHRISTOPHERSON, ROY; MENGHETTI, SARA; CHAPALAIN, FLORIAN; ETTRIDGE, PETER
To: BEMIS COMPANY, INC.
Reel/Frame 061664/0039 →
CHANGE OF NAME Recorded Nov 4, 2022
From: BEMIS COMPANY, INC.
To: AMCOR FLEXIBLES NORTH AMERICA, INC.
Reel/Frame 061884/0730 →
Continuity (1)
Related Publication 20230182457A1 · Jun 15, 2023
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