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:
Feb. 15, 2011
Filed:
Dec. 12, 2007
Young-keun Lee, Seoul, KR;
Jang-weon Rhee, Daejeon, KR;
Gwi-gwon Kang, Daejeon, KR;
In-hwa Jung, Chungcheongnam-do, KR;
Young-keun Lee, Seoul, KR;
Jang-weon Rhee, Daejeon, KR;
Gwi-gwon Kang, Daejeon, KR;
In-hwa Jung, Chungcheongnam-do, KR;
SK Energy Co., Ltd., Seoul, KR;
Abstract
The present invention relates to a process for manufacturing a microporous polyolefin film which can be used for various battery separators, separating filters and membranes for microfiltration. The process for manufacturing a microporous polyolefin film according to the invention comprises mixing/extrusion through efficient and separate injection of 15-55% by weight of polyolefin (Component I), and 85-45% by weight of a diluent (Component II) which forms thermodynamic single phase with the polyolefin and a diluent (Component III) which can undergo thermodynamic liquid-liquid phase separation with the polyolefin, into an extruder.