Polyolefin microporous film and method for preparing the same
US6566012B1 · kind B1 · utility
40Cited by
3References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2000 |
| Grant date | May 20, 2003 |
| Priority date | — |
| Expiry date | Dec 1, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
It is an object of the present invention to provide a microporous polyolefin membrane, high in pin puncture strength, adequate in pore diameter and high in porosity, comprising (A) an ultra-high-molecular-weight polyolefin having a weight-average molecular weight of 5×105 or more, or (B) a composition containing an ultra-high-molecular-weight polyolefin having a weight-average molecular weight of 5×105 or more, and having a porosity of 30 to 95%, bubble point exceeding 980 KPa and pin puncture strength of 4,900 mN/25 &mgr;m or more. The membrane can be used as a filter or as a separator for a battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.