US 12,460,072 B2
Propylene-based composition for pipes
Sean Comerford, Neath (GB); Monica Galvan, Ferrara (IT); Giampaolo Pellegatti, Ferrara (IT); and Francesca Tisi, Ferrara (IT)
Assigned to Basell Poliolefine Italia S.r.l., Milan (IT)
Appl. No. 17/763,094
Filed by BASELL POLIOLEFINE ITALIA S.R.L., Milan (IT)
PCT Filed Sep. 4, 2020, PCT No. PCT/EP2020/074772
§ 371(c)(1), (2) Date Mar. 23, 2022,
PCT Pub. No. WO2021/058264, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 19198959 (EP), filed on Sep. 23, 2019.
Prior Publication US 2022/0340744 A1, Oct. 27, 2022
Int. Cl. C08L 23/16 (2006.01); C08L 23/0807 (2025.01)
CPC C08L 23/16 (2013.01) [C08L 23/0815 (2013.01); C08L 2203/18 (2013.01); C08L 2205/025 (2013.01); C08L 2207/02 (2013.01)] 14 Claims
 
1. A polyolefin composition comprising:
from 2 wt % to 40 wt %, based upon the total weight of the polyolefin composition, of a first heterophasic polyolefin polymer A) comprising:
a1) a first crystalline propylene homopolymer matrix,
a2) a first propylene ethylene copolymer having an ethylene content ranging from 20.0 wt % up to 35.0 wt %, based upon the total weight of the first propylene ethylene copolymer, and
a3) a second propylene ethylene copolymer having an ethylene content ranging from 55.0 wt % up to 70.0 wt %, based upon the total weight of the second propylene ethylene copolymer, and
wherein the first heterophasic polyolefin polymer A) having xylene soluble content measured according to ISO 16152, 2005 ranging from 20.0 wt % to 40.0 wt %, based upon the total weight of the first heterophasic polyolefin polymer, and intrinsic viscosity of the xylene soluble fraction at 25° C. ranging from 3.0 dl/g to 4.0 dl/g,
and from 60 wt % to 98 wt %, based upon the total weight of the polyolefin composition, of a second heterophasic polyolefin polymer B) comprising:
b1) a second crystalline propylene homopolymer matrix,
b2) an ethylene C4-C10 α-olefin copolymer having an ethylene content ranging from 65.0 wt % up to 85.0 wt %, based upon the total weight of the ethylene C4-C10 α-olefin copolymer, and
b3) a third propylene ethylene copolymer having an ethylene content ranging from 40.0 wt % up to 50.0 wt %, based upon the total weight of the third propylene ethylene copolymer,
wherein the second heterophasic polyolefin polymer B) having xylene soluble content measured according to ISO 16152, 2005 ranging from 25.0 wt % to 45.0 wt %, based upon the total weight of the second heterophasic polyolefin polymer, and intrinsic viscosity of the xylene soluble fraction at 25° C. ranging from 1.5 dl/g to 2.8 dl/g,
the sum A)+B) being 100.