Laminate having a coextruded, multilayer film which delaminates and package made therefrom
US5919547A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1996 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Dec 11, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/3192
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A laminate comprising two or more films, at least one of the films being a coextruded, multilayer film, wherein the laminate delaminates within the coextruded, multilayer film when the laminate is subjected to a peel force ranging from 0.001 to 2.5 pounds per inch. The laminate advantageously provides the lid for a package and delaminates into a substantially gas-impermeable portion and a gas-permeable portion, with the gas-permeable portion being bonded directly to a product support member of the package. In this manner, the gas-impermeable portion may be peelably removed from the package to allow atmospheric oxygen to enter the interior of the package. The gas-permeable portion may be provided by perforating the delaminatable, coextruded film and bonding such film to the support member so that, when the laminate is caused to be delaminated within the perforated, coextruded film, the perforations are exposed to the ambient atmosphere and thereby allow for rapid ingress of oxygen into the interior of the package.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.