Multilayered barrier structures for packaging
US5084352A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1989 |
| Grant date | Jan 28, 1992 |
| Priority date | — |
| Expiry date | Nov 15, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31931
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Multilayered barrier film products providing gas and moisture barrier properties. The film products comprise at least a first polymer film having low permeability to moisture and a heterogeneous polymer blend film containing a gas barrier polymer and a second polymer distributed in the gas barrier polymer, so as to allow the heterogeneous polymer blend film to adhere to the first polymer film. A method for the preparation of multilayered barrier film products includes the steps of forming a gas barrier polymer film from a heterogeneous polymer blend containing a gas barrier polymer and a second polymer and, bonding a moisture barrier polymer film to at least one side of the gas barrier polymer film. The method can be practiced utilizing conventional coextrusion equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.