High OTR polyolefin films
US6485817B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 28, 2000 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Feb 13, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Oriented polyolefin composite films are disclosed comprised of core including an olefin heteropolymer core consisting essentially of an ethylene/propylene copolymer having less than 10%, by weight, ethylene and having a skin layer on at least one of its surfaces comprised of a high modulus polypropylene. These films are characterized by an oxygen and moisture vapor transmission rate greater than that of conventional polypropylene films and a tensile modulus great enough to permit their use as packaging films. This combination of properties makes these films suitable for packaging fresh produce items which continue to respire after they are harvested.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.