Patent ID: 9139794
Filing Date: 2015-09-22
Classification: C08L,C10M,C10N

Abstract:
1. A process for making a polymer composition comprising the steps of: (a) feeding (i) a first ethylene monomer, (ii) a first α-olefin comonomer, (iii) a first solvent, (iv) optionally a first hydrogen, and (v) a first metallocene catalyst, in a first polymerization reaction zone to produce a first ethylene-α-olefin copolymer; (b) feeding (ii) a second ethylene monomer, (ii) a second α-olefin comonomer, (iii) a second solvent, (iv) optionally a second hydrogen, and (v) a second metallocene catalyst, in a second polymerization reaction zone to produce a second ethylene-α-olefin copolymer; and (c) combining the first ethylene-α-olefin copolymer and the second ethylene-α-olefin copolymer to form a polymer composition, wherein the first ethylene-a-olefin copolymer has an ethylene content from about 60 to about 80 wt %, and the second ethylene-α-olefin copolymer has an ethylene content of from about 42 to about 60 wt %, wherein the polymer composition has a total ethylene content of from about 50 to about 70 wt %, wherein the temperature in the first polymerization reaction zone and the temperature in the second polymerization reaction zone differ by less than 10° C.; and wherein the process meets at least one of the following: (1) the first hydrogen is fed in step (a) at a first hydrogen feed concentration of 0.0-1.0 wt %, by total weight of (a)(i)-(iv) fed in step (a); and (2) the second hydrogen is fed in step (b) at a second hydrogen feed concentration of 0.0-0.5 wt %, by total weight of (b)(i)-(iv) fed in step (b).