Multilayered polymer films and process for the preparation thereof
US6333086A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1996 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | Jan 29, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention concerns a multilayered polymer film structure, which comprises at least one first layer (1) containing a thermoplastic polymer and at least one second layer (2), arranged adjacent to said first layer, containing a liquid crystalline polymer. According to the invention, the second layer (2) consists essentially of a compounded polymer blend formed by the liquid crystalline polymer and a thermoplastic polymer, the liquid crystalline polymer of the second layer forms a continuous phase, and the first and the second layers (1, 2) contain the same thermoplastic polymer. The oxygen transmission rate of the second layer is less than about 150 cm.sup.3 /(m.sup.2.multidot.d.multidot.bar), determined according to the standard ASTM D 3985-81, and the water vapour transmission rate of the integral film structure is less than 10 g/(m.sup.2.multidot.24.multidot.h) at RH 80% 23.degree. C., determined according to ASTM F 1249-90. The present structure can be used as a barrier layer in packages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.