Preparing method of microporous high density polyethylene film
US8313678B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2007 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Jun 27, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249993
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a microporous high-density polyethylene film for a battery separator, and process for preparing the same. The microporous high-density polyethylene film according to the present invention comprises of high-density polyethylene with weight average molecular weight of 2×105˜4×105, containing not more than 5 wt % of molecules with molecular weight of 1×104 or less and not more than 5 wt % of molecules with molecular weight of 1×106 or more, and has the properties of puncture strength of 0.22 N/μm or more, Darcy's permeability constant of 1.8×10−5 Darcy or more, and shrinkage of 4% or less in machine and transverse direction, respectively. Particularly, the microporous high-density polyethylene film has excellent extrusion-compoundability and stretchability with high productivity and enhances performances and stability of the battery using the film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.