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:
Apr. 18, 2017
Filed:
Dec. 23, 2014
SK Innovation Co., Ltd., Seoul, KR;
Min Ho Jeon, Daejeon, KR;
Byoung Cheon Jo, Daejeon, KR;
Sang Bae Cheong, Daejeon, KR;
Sang Hyun Park, Daejeon, KR;
Tae Gyu Kan, Daejeon, KR;
SK Innovation Co., Ltd., Seoul, KR;
Abstract
Provided are a multilayer separator capable of improving interlayer peel strength and exhibiting excellent permeability due to a high degree of alignment, and a method of manufacturing the same. The method of manufacturing a multilayer separator includes: manufacturing a precursor film by co-extruding and molding a polypropylene based resin melt having a melt index (2.16 kg, 230° C.) of 0.3 to 5 g/10 min and a polyethylene based resin melt having a melt index (2.16 kg, 190° C.) of 0.1 to 1.5 g/10 min so as to be alternately laminated; and heat-treating and stretching the manufactured film, wherein a melt index ratio (A/B) of the polypropylene based resin melt (A) and polyethylene based resin melt (B) is 2 to 10.