Microporous polyethylene film having excellent physical properties, productivity, and quality consistency, and method of producing same
US8057718B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2007 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Dec 23, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249992
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is a microporous polyethylene film for a battery separator and a method of producing the same. The microporous polyethylene film is made from a resin composition. The resin composition comprises 100 parts by weight of a polyethylene composition including 10-50 wt % polyethylene having a weight average molecular weight of from 2×105 to less than 5×105 (component I) and 90-50 wt % diluent (component II), and 0-150 parts by weight of inorganic powder (component III). The film has a puncture strength of 0.20 N/μm or more and a gas permeability (Darcy's permeability constant) of 1×10−5 Darcy or more. The microporous polyethylene film has excellent physical properties, thus improving the performance and stability of a battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.