Patent · US Active

Multi-layer, microporous polyethylene membrane, its production method, and battery separator

US7985497B2 · kind B2 · utility

4Cited by

2References

1Claims

0Family size

Assignee

Toray Tonen Specialty Separator Godo Kaisha · JP

Inventors

Kotaro Takita · Nasushiobara, JP
Shintaro Kikuchi · Yokohama, JP

Key dates

Filing date	Sep 27, 2006
Grant date	Jul 26, 2011
Priority date	—
Expiry date	Jul 9, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/249981
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A multi-layer, microporous polyethylene membrane having at least two layers, which comprises (a) a microporous polyethylene resin layer A comprising high-density polyethylene A having 0.2 or more terminal vinyl groups per 10,000 carbon atoms when measured by infrared spectroscopy, and (b) a microporous polyethylene resin layer B comprising high-density polyethylene B having less than 0.2 terminal vinyl groups per 10,000 carbon atoms when measured by infrared spectroscopy, has well-balanced permeability, mechanical strength, heat shrinkage resistance, shutdown properties, meltdown properties and oxidation resistance.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.