METHOD FOR PREPARING POLYPROPYLENE FOR SEPARATOR OF SECONDARY BATTERY HAVING EXCELLENT MECHANICAL AND THERMAL PROPERTIES

WIPO Patent Application WO/2023/090718

A1

In the preparation of polypropylene for a dry separator of a secondary battery, disclosed is a method for preparing polypropylene for a separator of a secondary battery, having improved flowability of resin while maximizing mechanical and thermal properties, compared to existing materials. The present invention provides a method for preparing polypropylene for a separator of a secondary battery by subjecting, in the presence of a Ziegler-Natta catalyst, propylene monomers to a polymerization reaction, wherein the propylene monomer polymerization reaction comprises the steps of: a) obtaining a high molecular weight polypropylene having a weight average molecular weight of 450,000 to 650,000 g/mol in a first reactor; and b) obtaining a low molecular weight polypropylene having a weight average molecular weight of 150,000 to 300,000 g/mol in a second reactor, and the molar ratio of a co-catalyst and an electron donor added in step a) is adjusted to 2 to 25, thereby preparing the polypropylene for a separator of a secondary battery.

JUNG SUN YOUNG (KR)
SON CHANG KYU (KR)
JUNG MIN SUK (KR)
CHO HEE WON (KR)
IM DONG JUN (KR)
KIM MIN JI (KR)
KIM KYUNG HOON (KR)

PCT/KR2022/017250

May 25, 2023

November 04, 2022

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LOTTE CHEMICAL CORP (KR)

C08F2/38; C08F10/06; C08F4/58; H01M50/417

KR20160062890A	2016-06-03
KR20060038102A	2006-05-03
KR20070004687A	2007-01-09
JP2015067817A	2015-04-13
US5028671A	1991-07-02

PARK, Sang Hoon (KR)

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