High oxygen barrier film
US5061534A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1988 |
| Grant date | Oct 29, 1991 |
| Priority date | — |
| Expiry date | Apr 22, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/3192
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Packaging films, and packages made with those films which have reduced sensitivity to humidity. The films include a first layer comprising an EVOH copolymer and a second layer comprising a vinylidene chloride copolymer. Packages made with the vinylidene chloride copolymer layer between the low ethylene content EVOH copolymer and the contained product provide high oxygen barrier properties under both high and low humidity conditions. At high humidity conditions, the oxygen barrier properties of the package are provided by the vinylidene chloride copolymer. At lower humidity conditions, the packaging material provides the superior oxygen barrier properties of the EVOH. So the packages of the invention provide superior oxygen barrier properties of the low ethylene content EVOH at lower humidities. But the oxygen barrier properties of the package are never less than those provided by the vinylidene chloride copolymer, even at high humidity conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.