Process of making polymer blends
AssigneeExxonMobil Chemical Patents Inc.
InventorPeijun Jiang
Life of this patent
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Abstract
In a process for producing a polymer blend, at least one first monomer is polymerized in a first slurry phase reaction zone in the presence of a supported first catalyst to produce a thermoplastic first polymer having a crystallinity of at least 30%. At least part of said first polymer is then contacted with at least one second monomer different from said first monomer in a second solution phase reaction zone in the presence of a second catalyst and in the absence of polyenes under conditions to produce a second polymer having a crystallinity of less than 20%.
Claims22
A process for producing a polymer blend comprising a thermoplastic first polymer having a crystallinity of at least 30% and a second polymer having a crystallinity of less than 20%, the process comprising:
- (a) polymerizing at least one first monomer in a first slurry phase reaction zone in the presence of a supported first catalyst under conditions to produce said thermoplastic first polymer;
- and
- (b) contacting at least part of said first polymer with at least one second monomer different from said first monomer in a second solution phase reaction zone in the presence of a second catalyst and in the absence of polyenes under conditions to produce said second polymer.
A process for producing a polymer blend comprising a first phase comprising a thermoplastic first polymer comprising units derived from propylene and a second elastomeric phase comprising a second polymer comprising units derived from ethylene and propylene, the process comprising:
- (a) polymerizing at least one first monomer comprising propylene in a first slurry phase reaction zone in the presence of a supported first catalyst under conditions to produce said thermoplastic first polymer;
- and
- (b) contacting at least part of said first polymer with at least one second monomer comprising ethylene in a second solution phase reaction zone in the presence of a second catalyst and in the absence of polyenes under conditions to produce said second polymer.
A process for producing a polymer blend comprising a first phase comprising a thermoplastic first polymer comprising units derived from propylene and a second elastomeric phase comprising a second polymer comprising units derived from ethylene and propylene, the process comprising:
- (a) polymerizing at least one first monomer comprising propylene in a first slurry phase reaction zone in the presence of a supported Ziegler-Natta catalyst under conditions to produce said thermoplastic first polymer;
- and
- (b) contacting at least part of said first polymer with at least one second monomer comprising ethylene in a second solution phase reaction zone in the presence of a metallocene catalyst under conditions to produce said second polymer.
Dependencies are inferred from the claim text.