Multilayer heat-shrinkable barrier film and packages made therefrom
US12427756B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2021 |
| Grant date | Sep 30, 2025 |
| Priority date | — |
| Expiry date | May 31, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2439/80
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A multilayer shrink film having at least two barrier layers. The barrier layers including ethylene-vinyl alcohol copolymer with an ethylene content of between 27-50 mol %. The multilayer shrink film having a free shrink of at least 60%, 65% and 70% at 85 #C measured in accordance with ASTM D2732. The multilayer shrink film having an oxygen transmission rate of no more than: 5, 10, 15, or 20 cubic centimeters (at standard temperature and pressure) per square meter per day per 1 atmosphere of oxygen pressure differential measured at 0% relative humidity and 23 #C measured according to ASTM D-3985. The multilayer shrink film having a haze after shrink of less than 50 measured in accordance with ASTM D 1003.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.