Sk Innovation Co., Ltd.

Jung-Moon Sung

Young-Keun Lee

Jang-weon Rhee

Byoung-Cheon Jo

Je-An Lee

Gwi-Gwon Kang

In-Hwa Jung

Chol-Ho Lee

Young-keun Lee

Disclosed in the present invention are a microporous polyethylene film and a method of manufacture thereof. The polyethylene microporous film manufactured according to the present invention may contribute to an increased productivity of stable products as its extrusion and stretching may be done readily. And thus manufactured product may be used for battery separators and various filters owing to its high gas permeability, superior puncture strength, and small ratio of shrinkage.

Microporous polyethylene film manufactured according to liquid-liquid phase separation and method of producing the same

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&#xd7;10&#x2dc;4&#xd7;10, containing not more than 5 wt % of molecules with molecular weight of 1&#xd7;10or less and not more than 5 wt % of molecules with molecular weight of 1&#xd7;10or more, and has the properties of puncture strength of 0.22 N/&#x3bc;m or more, Darcy's permeability constant of 1.8&#xd7;10Darcy 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.

Preparing method of microporous high density polyethylene film

Growing community of inventors

Seoul, South Korea

Jung-Moon Sung