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:
Mar. 12, 2019
Filed:
Jun. 22, 2015
Samsung Sdi Co., Ltd., Yongin-si, Gyeonggi-do, KR;
Sang Ho Lee, Suwon-si, KR;
Kee Wook Kim, Suwon-si, KR;
Yun Gi Kim, Suwon-si, KR;
Jung Seong Lee, Suwon-si, KR;
Jung Sue Jang, Suwon-si, KR;
Jun Ho Chung, Suwon-si, KR;
Jae Hyun Cho, Suwon-si, KR;
Dae Hyun Hong, Suwon-si, KR;
Samsung SDI Co., Ltd., Yongin-Si, Gyeonggi-do, KR;
Abstract
A polyolefin-based porous separator, including a first polyolefin-based porous film on a first surface of a second polyolefin-based porous film, and a third polyolefin-based porous film on a second surface of the second polyolefin-based porous film, each of the first and third polyolefin-based porous films containing inorganic particles having an average particle size of 10 nm to 100 nm, a thickness ratio of the first polyolefin-based porous film, the second polyolefin-based porous film, and the third polyolefin-based porous film being 0.5 to 1.5:1 to 6:0.5 to 1.5, and thermal shrinkage rates of the separator in a machine direction and a transverse direction measured after standing at 120° C. for 1 hour each being 5% or less, and air permeability of the separator being 250 sec/100 cc or less.