Polyethylene films with improved physical properties
US6956088B2 · kind B2 · utility
71Cited by
31References
58Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2002 |
| Grant date | Oct 18, 2005 |
| Priority date | — |
| Expiry date | Aug 10, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31938
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Metallocene catalyzed polyethylenes are found to have improved physical properties, improved processability and improved balance of properties. Surprisingly, there is a direct relationship between MD shrinkage, and MD tear. Additionally, MD tear is greater than TD tear, and MD tear is also greater than intrinsic tear. MD tear to TD tear ratios are above 0.9, and dart drop impact is above 500 g/mil. The polyethylenes have a relatively broad composition distribution and relatively broad molecular weight distribution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.