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:
Dec. 03, 2013
Filed:
May. 29, 2009
Jang-weon Rhee, Daejeon, KR;
IN Hwa Jung, Chungcheongnam-do, KR;
Gwig Won Kang, Daejeon, KR;
Young Keun Lee, Seoul, KR;
Jang-Weon Rhee, Daejeon, KR;
In Hwa Jung, Chungcheongnam-do, KR;
Gwig Won Kang, Daejeon, KR;
Young Keun Lee, Seoul, KR;
SK Innovation Co., Ltd., Seoul, KR;
Abstract
A microporous polyolefin multilayer film which is used as a separator for a battery is a 3 layer microporous film which is prepared by a wet process to have both surface layers containing polyethylene of 95 wt % or more having a melting temperature of 125° C. or higher, and an inner layer containing polypropylene of 50 to 90 wt % having a melting temperature of 160° C. or higher and polyethylene of 10 to 50 wt % having a melting temperature of 125° C. or higher. A thickness of the film is 9-50/M, a puncture strength is 0.15N//M or more, a permeability is 1.5×10Darcy or more, a multiplication of the puncture strength and the permeability is 0.4×10Darcy·N/μm or more, a shrinkage in a transverse direction at 120° C. for 1 hour is 15% or less, and a melt fracture temperature of 160° C. or higher.