US 11,732,067 B2
High stiffness polypropylene impact copolymer
Christopher G. Bauch, Seabrook, TX (US); and Todd S. Edwards, League City, TX (US)
Assigned to ExxonMobil Chemical Patents Inc., Baytown, TX (US)
Appl. No. 16/624,614
Filed by ExxonMobil Chemical Patents Inc., Baytown, TX (US)
PCT Filed Apr. 11, 2018, PCT No. PCT/US2018/027088
§ 371(c)(1), (2) Date Dec. 19, 2019,
PCT Pub. No. WO2019/005261, PCT Pub. Date Jan. 3, 2019.
Claims priority of provisional application 62/525,347, filed on Jun. 27, 2017.
Prior Publication US 2020/0140584 A1, May 7, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. C08F 110/06 (2006.01); C08F 4/02 (2006.01); C08F 10/06 (2006.01)
CPC C08F 110/06 (2013.01) [C08F 4/022 (2013.01); C08F 10/06 (2013.01)] 18 Claims
 
1. An impact copolymer comprising:
a homopolypropylene having a melt flow rate of at least 20 g/10 min (ASTM D1238, 230° C., 2.16 kg), an Mw/Mn within a range from 7 to 16, and an Mz/Mw within a range from 7 to 16, and comprising 1.1 wt % or less of atactic polypropylene based on a total weight of the homopolypropylene and the atactic polypropylene; and
within a range from 2 wt % to 30 wt % of a propylene-α-olefin copolymer, by weight of the impact copolymer;
wherein the impact copolymer has a melt flow rate within a range of 60 g/10 min to 160 g/10 min (ASTM D1238, 230° C., 2.16 kg); and
wherein the propylene-α-olefin copolymer is prepared by a gas phase polymerization reaction in the presence of the homopolypropylene, such that at least some of the homopolypropylene and the propylene-α-olefin copolymer are linked to one another, and the propylene-α-olefin copolymer is embedded in a continuous matrix of the homopolypropylene wherein the propylene-α-olefin copolymer comprises within a range from 30 wt % to 43 wt % α-olefin derived units by weight of the propylene-α-olefin copolymer.