Coextruded, retortable multilayer film
US6599639B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2001 |
| Grant date | Jul 29, 2003 |
| Priority date | — |
| Expiry date | Mar 16, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31928
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A coextruded, retortable film includes a core layer having an ethylene/vinyl alcohol copolymer; two intermediate layers including a polyamide; two adhesive layers including a polymeric adhesive; and two outer layers including low density polyethylene, medium density polyethylene, high density polyethylene, ethylene/alpha olefin copolymer, propylene homopolymer, and/or propylene/alpha olefin copolymer. A method of packaging a product using this film, and a package, are disclosed. A retortable film includes a first layer including low density polyethylene, medium density polyethylene, high density polyethylene, ethylene/alpha olefin copolymer, propylene homopolymer, and/or propylene/alpha olefin copolymer; a second layer including a polymeric adhesive; a third layer including an ethylene/vinyl alcohol copolymer; a fourth layer including a polymeric adhesive; a fifth layer including a polyamide; a sixth layer including a polymeric adhesive; and a seventh layer including low density polyethylene, medium density polyethylene, high density polyethylene, ethylene/alpha olefin copolymer, propylene homopolymer, and/or propylene/alpha olefin copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.