Multilayer oxygen-barrier packaging film
US5914164A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1996 |
| Grant date | Jun 22, 1999 |
| Priority date | — |
| Expiry date | May 24, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A thermoplastic multilayer packaging film is described which has a % free shrink at 100.degree..degree. C. lower than 30 in both directions and a % free shrink at 120.degree. C. higher than 45 in at least one direction, and comprises at least the following layers: PA1 (i) an oxygen barrier core layer comprising ethylene-vinyl alcohol copolymer; PA1 (ii) two outer or skin layers and PA1 (iii) two inner adhesive layers each adhering to opposite respective surfaces of the core layer, said film being characterized in that the outer layers (ii) essentially consist of a polymeric blend of a Component A and a Component B wherein Component A is used in a major amount and is selected from the group consisting of heterogeneous ethylene-.alpha.-olefin copolymers with a density .ltoreq.0.915 g/cc, homogeneous ethylene-.alpha.-olefin copolymers with a density .ltoreq.0.915 g/cc, and blends thereof, and Component B is used in a minor amount and is a polymer or a polymer blend compatible with Component A characterized by a melting point higher than 120.degree. C. The above film is obtained by a process which comprises the orientation of the extruded film at a temperature preferably comprised betw…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.