Process for producing polyethylene film composition having broad molecular weight distribution and improved bubble stability
US6147167A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1999 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Jun 21, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for producing a polyethylene film composition, comprising melt extruding a linear copolymer of ethylene and at least one other olefin having from 3 to 8 carbon atoms, said linear copolymer having a bimodal distribution comprising a high molecular weight fraction having a weight average molecular weight of at least 600,000 and a low molecular weight fraction having a weight average molecular weight of less than 20,000 at a temperature of from 195 to 285.degree. C. in the presence of oxygen in an amount of from about 0.5 to about 6% by volume to improve bubble stability without any significant reduction in tear strength of film produced from said melt extruded linear copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.