Microporous polyolefin membrane, its production method, and battery separator
US7700182B2 · kind B2 · utility
3Cited by
0References
18Claims
0Family size
Assignee
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Key dates
| Filing date | May 15, 2006 |
| Grant date | Apr 20, 2010 |
| Priority date | — |
| Expiry date | May 17, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249978
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A microporous polyolefin membrane comprising a polyethylene resin, and polypropylene having a weight-average molecular weight of 6×105 or more and a heat of fusion of 90 J/g or more (measured by a differential scanning calorimeter), a fraction having a molecular weight of 1.8×106 or more being 10% or more by mass of the polypropylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.