US 12,441,859 B2
Strain hardened polypropylene copolymer compositions
Sasha P. Schmitt, Houston, TX (US); George J. Pehlert, Houston, TX (US); Stefan B. Ohlsson, Keerbergen (BE); and Willy J.J. Leysen, Sao Paulo (BR)
Assigned to ExxonMobil Chemical Patents Inc., Baytown, TX (US)
Appl. No. 17/276,191
Filed by ExxonMobil Chemical Patents Inc., Baytown, TX (US)
PCT Filed Sep. 6, 2019, PCT No. PCT/US2019/049879
§ 371(c)(1), (2) Date Mar. 15, 2021,
PCT Pub. No. WO2020/068393, PCT Pub. Date Apr. 2, 2020.
Claims priority of provisional application 62/736,645, filed on Sep. 26, 2018.
Claims priority of application No. 18199601 (EP), filed on Oct. 10, 2018.
Prior Publication US 2022/0025143 A1, Jan. 27, 2022
Int. Cl. C08J 9/04 (2006.01); C08F 210/06 (2006.01); C08K 5/14 (2006.01)
CPC C08J 9/04 (2013.01) [C08F 210/06 (2013.01); C08K 5/14 (2013.01); C08J 2323/14 (2013.01)] 21 Claims
 
1. A composition comprising the product of:
a copolymer comprising at least 50 mol % propylene and at least 1 wt % of at least one of ethylene or a C4 to C10 α-olefin, based on the total weight of the copolymer, the copolymer having MwMALLS/MnMALLS of from 1 to 5; and
an organic peroxide;
wherein the product is a melt blend of a homogenized mixture,
wherein the homogenized mixture comprises:
solid particles of the copolymer, wherein the solid particles are granules having a diameter of from 100 micrometers to 2,000 micrometers; and
a decomposition product of the organic peroxide,
wherein the product comprises the copolymer crosslinked by the organic peroxide, and
wherein the product has the following:
a peak extensional viscosity (strain rate: 1 sec−1 to 10 sec−1, 190° C.) of from 1×103 Pa·s to 1×106 Pa·s; and
a MwMALLS/MnMALLS of from 1.6 to 2.5.
 
18. A process to form a composition comprising:
mixing a copolymer with a decomposition product of an organic peroxide, the copolymer comprising at least 50 mol % propylene and at least 1 wt % of at least one of ethylene or a C4 to C10 α-olefin, based on the total weight of the copolymer, the copolymer having an MwMALLS/MnMALLS of from 1 to 5 in the form of solid particles, the solid particles are granules having a diameter of from 100 micrometers to 2,000 micrometers, thereby obtaining a homogenized mixture thereof;
melt blending the homogenized mixture; and
obtaining a composition comprising a product comprising the copolymer crosslinked by the organic peroxide, the product having the following:
a peak extensional viscosity (strain rate: 1 sec−1 to 10 sec−1, 190° C.) of from 1×103 Pa·s to 1×106 Pa·s; and
a MwMALLS/MnMALLS of from 1.6 to 2.5.