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US 2015/0147552 A1Published application
Reverse Staged Impact Copolymers
AssigneeExxonMobil Chemical Patents Inc.
InventorsMatthew W. Holtcamp, Laughlin G. McCullough, Celestino M. Perez, JR., Sarah J. Mattler
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Abstract
This invention relates to processes to prepare impact copolymers having an ethylene content of greater than 20 wt % using a process where ethylene polymer is made in the first stage and propylene polymer is made in the second stage.
Claims34
A process for producing ethylene-based in-reactor compositions comprising:
- a) contacting ethylene and optionally a C2 to a C12 alpha-olefin comonomer under polymerization conditions in a first stage in the presence of a first metallocene catalyst system to form Component A;
- b) contacting Component A of step (a) with a C3 to a C12 alpha-olefin monomer under polymerization conditions in a second stage in the presence of a second metallocene catalyst system to form Component B, wherein the first metallocene catalyst system is present in both steps a and b and/or additional metallocene catalyst is added to the reaction mixture between steps a and b and the first metallocene catalyst system may be the same as the second metallocene catalyst system;
- and
- c) obtaining an ethylene-based in-reactor composition comprising Component A and Component B, wherein the ethylene-based in-reactor composition has from greater than 20% to about 85% of ethylene on a mole percentage basis and wherein the polymer composition has a multimodal melting point.
1 more element
An ethylene-based in-reactor composition comprising:
- (a) from about 20 wt % to about 50 wt % of a Component A polymer, based on the weight of the in-reactor composition;
- wherein Component A comprises 100 wt % to 50 wt % ethylene derived units and 0 wt % to 50 wt % C3 and/or C4 to C20 alpha olefin derived units, based on the weight of Component A;
- (b) from about 80 wt % to about 50 wt % of a Component B copolymer, based on the weight of the in-reactor composition;
- wherein Component B comprises 70 wt % to 100 wt % propylene derived units and 0 wt % to 30 wt % C2 to C20 alpha olefin derived units, based on the weight of Component B;
- wherein the total ethylene content of the ethylene-based in-reactor composition ranges from 20 wt % to 70 wt %;
- wherein the ethylene-based in-reactor composition has a multimodal melting point and an elongation at break of greater than 100%.
3 more elements
Dependencies are inferred from the claim text.