High OTR films made from homopolymer polypropylene and 1-butene/ethylene copolymer blends
US6953617B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 2003 |
| Grant date | Oct 11, 2005 |
| Priority date | — |
| Expiry date | Aug 17, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31938
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyolefin blend having in a range of 40 to less than 90% by weight of a high modulus, isotactic polypropylene; and in a range of 10 to 60% by weight of a 1-butene/ethylene copolymer; the 1-butene/ethylene copolymer having about 0.5 to about 10 wt % of an ethylene. A polyolefin blend can be in a form of a transparent, oriented film having a biaxially oriented layer with an oxygen transmission rate of at least about 200 cc/100 sq. in./day/atmosphere (3077 cc/sq. m./24h/atmosphere), a tensile modulus of at least about 160,000 psi (1.103 GPa) and a haze value of no greater than about 3% measured at a thickness of about 1 mil (25 μm).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.