	US 11,866,540 B2
	Polypropylene resin for insulating electric cables
BongSeock Kim, Chungcheongnam-do (KR); Youngjoo Lee, Chungcheongnam-do (KR); Youngwook Choi, Chungcheongnam-do (KR); and YongSung Chun, Chungcheongnam-do (KR)
Assigned to HANWHA TOTALENERGIES PETROCHEMICAL CO., LTD.
Appl. No. 16/960,728
Filed by HANWHA TOTAL PETROCHEMICAL CO., LTD., Seosan-si (KR)
PCT Filed Nov. 8, 2018, PCT No. PCT/KR2018/013511 § 371(c)(1), (2) Date Jul. 8, 2020, PCT Pub. No. WO2019/143008, PCT Pub. Date Jul. 25, 2019.
Claims priority of application No. 10-2018-0007521 (KR), filed on Jan. 22, 2018.
Prior Publication US 2020/0339723 A1, Oct. 29, 2020
Int. Cl. C08F 297/08 (2006.01); C07C 69/70 (2006.01); C08F 210/16 (2006.01); C08L 53/00 (2006.01); C07C 69/708 (2006.01); H01B 3/44 (2006.01)

CPC C08F 297/083 (2013.01) [C07C 69/708 (2013.01); H01B 3/441 (2013.01); C08F 2500/12 (2013.01); C08F 2500/17 (2013.01)]

11 Claims

1. An ethylene-propylene block copolymer resin obtained by polymerization of a propylene homopolymer or an ethylene-propylene random copolymer with an ethylene-propylene rubber copolymer in stages in reactors in the presence of a Ziegler-Natta catalyst obtained comprising an internal electron donor composed of a combination of a non-aromatic alkoxy ester-based compound and a phthalic acid ester-based compound, wherein the ethylene-propylene block copolymer resin has a melting temperature (Tm) of 150 to 160° C., the content of the solvent extract when it is extracted at room temperature with xylene is 30 to 50% by weight, and the intrinsic viscosity of the solvent extract is 1.5 to 3.0 dl/g.