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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.:

US 12462989 B1

PDFFull Text
Date of Patent:
Nov. 04, 2025

Filed:

Nov. 29, 2019

Cross-linked polyolefin separator and manufacturing method therefor

Applicant:

Lg Chem, Ltd., Seoul, KR;

Inventors:

Bi-Oh Ryu, Daejeon, KR;

Joo-Sung Lee, Daejeon, KR;

Won-Sik Bae, Daejeon, KR;

Assignee:

LG Chem, Ltd., Seoul, KR;

Attorney:

Lerner David LLP

Primary Examiner:

Brian R Ohara

Assistant Examiner:

Emily Elizabeth Freeman

Int. Cl.
CPC ...
H01G 11/52 (2013.01); B01D 67/00 (2006.01); B01D 71/02 (2006.01); B01D 71/26 (2006.01); B01D 71/70 (2006.01); B29C 48/91 (2019.01); B29K 23/00 (2006.01); B29K 105/24 (2006.01); C08F 8/42 (2006.01); C08J 3/24 (2006.01); H01M 50/443 (2021.01);
U.S. Cl.
CPC ...
H01G 11/52 (2013.01); B01D 67/0079 (2013.01); B01D 67/00931 (2022.08); B01D 71/024 (2013.01); B01D 71/261 (2022.08); B01D 71/262 (2022.08); B01D 71/70 (2013.01); B29C 48/91 (2019.02); C08F 8/42 (2013.01); C08J 3/24 (2013.01); H01M 50/443 (2021.01); B29K 2023/065 (2013.01); B29K 2105/24 (2013.01); C08J 2323/04 (2013.01); C08L 2312/08 (2013.01);
Abstract

A crosslinked polyolefin separator and a method of making the same are disclosed herein. The method includes mixing a polyolefin, a diluting agent, an initiator, a crosslinking catalyst, and inorganic particles surface treated with an alkoxysilane containing a carbon-carbon double bonded group in an extruder to obtain a mixture, and then reactively extruding the mixture to form an extruded silane-grafted polyolefin composition; molding and orienting the extruded silane-grafted polyolefin composition in the form of an oriented sheet; extracting the diluting agent from the oriented sheet to obtain a porous membrane; thermally fixing the porous membrane to obtain a thermally fixed porous membrane; and crosslinking the thermally fixed porous membrane in the presence of moisture.

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