Multilayer oxygen barrier packaging film
US6221470A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1998 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Dec 10, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A thermoplastic multilayer packaging film has a core layer including ethylene/vinyl alcohol copolymer; two outer layers, and two adhesive layers each disposed between the core layer and a respective outer layer, characterized in that at least one of the outer layers includes a blend of A, B, and C, wherein component A is a homogeneous or heterogeneous ethylene/alpha olefin copolymer with density comprised greater than 0.915 g/cm.sup.3 and less than 0.925 g/cm.sup.3, component B is a homogeneous or heterogeneous ethylene/alpha olefin copolymer with density greater than or equal to 0.925 g/cm.sup.3, and component C is a homogeneous or heterogeneous ethylene/alpha olefin copolymer with density less than or equal to 0.915 g/cm.sup.3. The use of modified homogeneous ethylene/alpha olefin copolymers with a density of from 0.900 g/cm.sup.3 to 0.908 g/cm.sup.3 as adhesive layers to improve the interlayer adhesion and the sealability properties of films with a core layer comprising an ethylene/vinyl alcohol copolymer or a polyamide and outer layers comprising an ethylene/alpha olefin copolymer is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.