High density polyethylene
First Claim
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1. A multimodal polyethylene possessing a density from 0.940 to 0.965 g/cm3, and an I21 from 4 to 20 dg/min, and comprising the following ethylene copolymers:
- (a) a low molecular weight ethylene copolymer having a weight average molecular weight from 5,000 amu to 50,000 amu and having a short chain branching index from 2.5 to 4.5; and
(b) a high molecular weight ethylene copolymer having a weight average molecular weight from 60,000 amu to 800,000 amu and having a short chain branching index from 1 to 2.5.
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Abstract
Multimodal polyethylenes possessing a density from 0.940 to 0.965 g/cm3, and an I21 from 4 to 20 dg/min, and comprising a low molecular weight ethylene copolymer having a weight average molecular weight from 5,000 amu to 50,000 amu; and a high molecular weight ethylene copolymer having a weight average molecular weight from 60,000 amu to 800,000 amu, both components having a desirable balance of short chain branching making the multimodal polyethylene suitable for films, pipes, rotomolding applications and blow molding applications.
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Citations
21 Claims
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1. A multimodal polyethylene possessing a density from 0.940 to 0.965 g/cm3, and an I21 from 4 to 20 dg/min, and comprising the following ethylene copolymers:
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(a) a low molecular weight ethylene copolymer having a weight average molecular weight from 5,000 amu to 50,000 amu and having a short chain branching index from 2.5 to 4.5; and (b) a high molecular weight ethylene copolymer having a weight average molecular weight from 60,000 amu to 800,000 amu and having a short chain branching index from 1 to 2.5. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A multimodal polyethylene possessing a density from 0.940 to 0.965 g/cm3, and an I21 from 4 to 20 dg/min, and comprising the following ethylene copolymers:
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(a) a low molecular weight ethylene copolymer having a weight average molecular weight from 5,000 amu to 50,000 amu; and (b) a high molecular weight ethylene copolymer having a weight average molecular weight from 60,000 amu to 800,000 amu; wherein the weight fraction of the high molecular weight ethylene copolymer relative to the entire multimodal composition ranges from 0.3 to 0.7; and wherein the ratio of the branching index of the low and high molecular weight ethylene copolymers ranges from 1.2 to 6.0. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification