Sk Energy Co., Ltd.

Sk Corporation

Byung Rae Jung

Young Keun Lee

Byoung Cheon Jo

Jung Moon Sung

In Hwa Jung

Jang Weon Rhee

Chol Ho Lee

Won Young Cho

Disclosed is a microporous high density polyethylene film for a battery separator and a method of producing the same. The microporous high density polyethylene film includes high density polyethylene with a weight average molecular weight of 2&#xd7;10-5&#xd7;10, containing 5 wt % or less molecule with a molecular weight of 1&#xd7;10or less. The microporous high density polyethylene film has tensile strengths of 1,100 kg/cmor more in transverse and machine directions respectively, a puncture strength of 0.22 N/&#x3bc;m or more, a gas permeability (Darcy's permeability constant) of 1.3&#xd7;10Darcy or more, and shrinkages of 5% or less in machine and transverse directions, respectively. Particularly, the microporous high density polyethylene film has an excellent extrusion-compoundabiliy and stretchability and a high productivity, and can improve the performances and stability of a battery produced using the same.

Method of producing microporous high density polyethylene film

Disclosed is a microporous polyethylene film for a battery separator and a method of producing the same. The microporous polyethylene film comprises a resin mixture, which includes 100 parts by weight of composition containing 20-50 wt % polyethylene with a weight average molecular weight of 5&#xd7;10-3&#xd7;10(component I) and 80-50 wt % diluent (component II), 0.1-2 parts by weight of peroxide (component III), and 0.05-0.5 parts by weight of anti-oxidant (component IV). The microporous polyethylene film has a puncture strength of 0.22 N/&#x3bc;m or more and a gas permeability (Darcy's permeability constant) of 1.3&#xd7;10Darcy or more. The present invention increases production efficiency of the microporous film, and improves performances and stability of the battery when the microporous polyethylene film is used in a battery separator.

Microporous polyethylene film and method of producing the same

Microporous high density polyethylene film

Growing community of inventors

Daejeon, South Korea

Byung Rae Jung