Ethylene α-olefin elastomeric polymer compositions having improved extrusion processibility
AssigneeExxon Mobil Chemical Patents Inc.
InventorsPeriagaram S. Ravishankar, Narayanaswami Raja Dharmarajan
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Abstract
Extruded shapes, profiles and parts in general based on an ethylene, alpha-olefin elastomeric polymer are manufactured utilizing a tailored approach to polymerization, leading to a polymer that delivers all of the benefits of metallocene based polymers, but without the drawbacks. Additionally, the ethylene, alpha-olefin elastomeric polymer has a broader molecular weight distribution than generally available from metallocene catalyzed elastomeric polymers.
Claims15
An ethylene, α-olefin elastomeric polymer composition exhibiting improved processability when extruded in a compound, comprising:
- a) at least a first ethylene, α-olefin elastomeric polymer, said first elastomeric polymer having:
- i) said ethylene present in said elastomeric polymer in the range of from about 70-80 weight percent;
- ii) said α-olefin making up the remainder of the elastomeric polymer;
- said first elastomeric polymer having a Mooney viscosity in the range of from 80-120 (ML 1+4 @125° C.), and
- b) at least a second ethylene, α-olefin elastomeric polymer, said second elastomeric polymer having;
- i) said ethylene present in said elastomeric polymer in the range of from about 40-80 weight percent;
- ii) said α-olefin making up the remainder of the elastomeric polymer;
- said second elastomeric polymer having a Mooney viscosity from ⅕ to {fraction (1/20)} of that of said first elastomeric polymer.
An ethylene, α-olefin elastomeric polymer composition exhibiting improved processability when extruded in a compound, comprising:
- a) at least a first ethylene, α-olefin elastomeric polymer, said first elastomeric polymer having:
- i) said ethylene present in said elastomeric polymer in the range of from about 70-80 weight percent;
- ii) said α-olefin making up the remainder of the elastomeric polymer;
- said first elastomeric polymer having a Mooney viscosity in the range of from 80-120 (ML 1+4 @ 125° C.), said first elastomeric polymer present in said elastomeric polymer in the range of from about 20-50 weight percent;
- and
- b) at least a second ethylene, α-olefin elastomeric polymer, said second elastomeric polymer having;
- i) said ethylene present in said elastomeric polymer in the range of from about 40-80 weight percent;
- ii) said α-olefin making up the remainder of the elastomeric polymer;
- said second elastomeric polymer having a Mooney viscosity from ⅕ to {fraction (1/20)} of that of said first elastomeric polymer;
- said second elastomeric polymer being present in the range of 50-80 weight percent based on the total weight of said elastomeric polymer;
- said first and said second elastomeric polymers having a Mw/Mn from 2-4;
- and
- said elastomeric polymer having Mw/Mn>2.
An ethylene, α-olefin elastomeric polymer composition exhibiting improved processability when extruded in a compound, comprising:
- a) at least a first ethylene, α-olefin elastomeric polymer, said first elastomeric polymer having:
- i) said ethylene present in said elastomeric polymer in the range of from about 70-80 weight percent;
- ii) said α-olefin making up the remainder of the elastomeric polymer;
- said first elastomeric polymer having a Mooney viscosity in the range of from 80-120 (ML 1+4 @ 125° C.), said first elastomeric polymer present in said elastomeric polymer in the range of from about 20-50 weight percent;
- and
- b) at least a second ethylene, α-olefin elastomeric polymer, said second elastomeric polymer having;
- i) said ethylene present in said elastomeric polymer in the range of from about 40-80 weight percent;
- ii) said α-olefin making up the remainder of the elastomeric polymer;
- said second elastomeric polymer having a Mooney viscosity from ⅕ to {fraction (1/20)} of that of said first elastomeric polymer;
- said second elastomeric polymer being present in the range of 50-80 weight percent based on the total weight of said elastomeric polymer;
- said first and said second elastomeric polymers having a Mw/Mn from 2-4;
- said elastomeric polymer composition having a Mw/Mn>2,
- having a metal content, as determined by X-ray fluorescence, of less than 0.01 weight percent, and
- being substantially free of calcium, and
- wherein the alpha olefin is propylene and said elastomeric polymer composition is made with a metallocene catalyst.
Dependencies are inferred from the claim text.