Multilayer polyolefin substrate with low density core and stiff outer layers
US6946203B1 · kind B1 · utility
13Cited by
35References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2002 |
| Grant date | Sep 20, 2005 |
| Priority date | — |
| Expiry date | Jul 29, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A biaxially oriented thermoplastic structure including a low density core layer formed from polypropylene, highly crystalline polypropylene or high density polyethylene, and outer layers formed from highly crystalline polypropylene or high density polyethylene. The thickness of the core layer is about 60 to about 95% of the overall thickness of the structure. The stiffness of the structure in the machine direction is in a range from about 0.015 to about 0.15 pound force-centimeters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.