	US 12,187,880 B2
	Polypropylene polymer composition having high stiffness properties
John Kaarto, Columbia, MD (US); Jing Zhong, Columbia, MD (US); and Amaia Montoya-Goni, Columbia, MD (US)
Assigned to W.R. GRACE & CO.-CONN, Columbia, MD (US)
Appl. No. 17/594,174
Filed by W. R. GRACE & CO.-CONN, Columbia, MD (US)
PCT Filed Apr. 3, 2020, PCT No. PCT/US2020/026548 § 371(c)(1), (2) Date Oct. 5, 2021, PCT Pub. No. WO2020/206229, PCT Pub. Date Oct. 8, 2020.
Claims priority of provisional application 62/830,007, filed on Apr. 5, 2019.
Prior Publication US 2022/0177682 A1, Jun. 9, 2022
Int. Cl. C08L 23/12 (2006.01); C08F 110/06 (2006.01); C08L 23/14 (2006.01)

CPC C08L 23/12 (2013.01) [C08F 110/06 (2013.01); C08F 2500/30 (2021.01); C08F 2500/35 (2021.01); C08L 23/14 (2013.01); C08L 2205/025 (2013.01); C08L 2205/24 (2013.01); C08L 2314/02 (2013.01)]

17 Claims

1. A polypropylene polymer composition comprising:

a first polypropylene polymer combined with a second polypropylene polymer, the first polypropylene polymer has a melt flow rate of from about 0.1 g/10 min to about 3 g/10 min and a xylene soluble content of from about 2.5% by weight to about 7% by weight,

the second polypropylene polymer has a melt flow rate of from about 5 g/10 min to about 100 g/10 min and a xylene soluble content of from about 2.5% by weight to about 7% by weight; and

wherein the polypropylene polymer composition has a flexural modulus according to the following formula:

FX≥2072*XS⁻0.18

wherein FX is flexural modulus and XS is xylene soluble content of the polypropylene polymer composition, the xylene soluble content of the polypropylene polymer composition is from about 2.5% to about 7% by weight.