Polyethylene films with improved physical properties
US8399581B2 · kind B2 · utility
8Cited by
54References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2004 |
| Grant date | Mar 19, 2013 |
| Priority date | — |
| Expiry date | Jan 12, 2026 |
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.