Shear thinning ethylene/α-olefin interpolymers and their preparation
AssigneeDow Global Technologie Inc.
InventorsLarry D. Cady, Morgan M. Hughes, Michael K. Laughner, Larry A. Meiske, Deepak R. Parikh
Life of this patent
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Abstract
Shear-thinning ethylene/α-olefin and ethylene/α-olefin/diene monomer interpolymers that do not include a traditional branch-inducing monomer such as norbornadiene are prepared at an elevated temperature in an atmosphere that has little or no hydrogen using a constrained geometry complex catalyst and an activating cocatalyst.
Claims25
A composition comprising a shear thinning ethylene/α-olefin interpolymer, the interpolymer, having polymerized therein, ethylene and at least one α-olefin monomer, and wherein the interpolymer is characterized by a Processing Rheology Ratio (PRR) of at least eight, wherein
- PRR=(interpolymer Viscosity measured at 190° C. with a shear rate of 0.1 rad/sec)/(interpolymer Viscosity measured at 190° C. with a shear rate of 100 rad/sec)+[3.82−interpolymer Mooney Viscosity (ML1+4@125°C.)]×0.3, and
- wherein the interpolymer is formed in the presence of at least one constrained geometry metal complex, and
- wherein the interpolymer has a molecular weight distribution of at least 2.5, and wherein the interpolymer is polymerized in a loop reactor, in which the polymer concentration in the reactor, under steady state conditions, is from 10 to 20 weight percent, and the polymerization temperature is from 80° C. to 140° C.
A composition comprising a shear thinning ethylene/α-olefin interpolymer, the interpolymer, having polymerized therein, ethylene, at least one α-olefin monomer, and
- wherein the interpolymer is characterized by a Processing Rheology Ratio (PRR) of at least twenty, wherein PRR= (interpolymer Viscosity measured at 190° C. with a shear rate of 0.1 rad/sec)/(interpolymer Viscosity measured at 190° C. with a shear rate of 100 rad/sec)+[3.82 −interpolymer Mooney Viscosity (ML1+4@125° C.)]×0.3, and
- wherein the interpolymer has a molecular weight distribution of at least 2.3, and a Mooney Viscosity (ML at 125° C.) of at least 15, and wherein the interpolymer is polymerized in a loop reactor, in which the polymer concentration in the reactor, under steady state conditions, is from 10 to 20 weight percent, and the polymerization temperature is from 80° C. to 140° C.
A composition comprising a shear thinning ethylene/α-olefin interpolymer, the interpolymer, having polymerized therein, ethylene and at least one α-olefin monomer, and
- wherein the interpolymer is characterized by a Processing Rheology Ratio (PRR) of at least eight, wherein
- PRR= (interpolymer Viscosity measured at 190° C. with a shear rate of 0.1 rad/sec)/(interpolymer Viscosity measured at 190° C. with a shear rate of 100 rad/sec)+[3.82 −interpolymer Mooney Viscosity (ML1+4@125° C.)]×0.3, and wherein the interpolymer has a molecular weight distribution of at least 2.5, and wherein the interpolymer is polymerized in a loop reactor, in which the polymer concentration in the reactor, under steady state conditions, is from 10 to 20 weight percent, and the polymerization temperature is from 80° C. to 140° C.
Dependencies are inferred from the claim text.