The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 14, 2008
Filed:
Sep. 20, 2004
Young Keun Lee, Daejeon, KR;
Jang Weon Rhee, Daejeon, KR;
Won Young Cho, Daejeon, KR;
Jung Moon Sung, Seoul, KR;
Byoung Cheon JO, Daejeon, KR;
Chol Ho Lee, Daejeon, KR;
IN Hwa Jung, Daejeon, KR;
Byung Rae Jung, Daejeon, KR;
Young Keun Lee, Daejeon, KR;
Jang Weon Rhee, Daejeon, KR;
Won Young Cho, Daejeon, KR;
Jung Moon Sung, Seoul, KR;
Byoung Cheon Jo, Daejeon, KR;
Chol Ho Lee, Daejeon, KR;
In Hwa Jung, Daejeon, KR;
Byung Rae Jung, Daejeon, KR;
SK Energy Co., Ltd., Seoul, KR;
Abstract
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 5×10-3×10(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/μm or more and a gas permeability (Darcy's permeability constant) of 1.3×10Darcy 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.