Polymerization of olefins
AssigneeE. I. Du Pont de Nemours and Company
InventorsPatricia Metzger Cotts, William Howard Tuminello, Lin Wang, Joel David Citron
Life of this patent
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Abstract
Polyolefins made preferably only from ethylene using a selected ethylene oligomerization catalyst to form α-olefins and a polymerization catalyst which can copolymerize ethylene and α-olefins produces a novel polymer which advantageous rheological properties.
Claims22
A branched polyethylene having fewer than 2 methyl branches per 1000 methylene groups, said fewer than 2 methyl branches excluding end groups, a processability index, PR, of about 40 or more, and
- (A) a structural index, ST, of about 1.4 or more;
- or
- (B) a ST of less than about 1.4, and one or more feature selected from the group consisting of:
- (i) at least 4 branches each of ethyl and n-hexyl or longer and at least 2 n-butyl branches per 1000 methylene groups;
- (ii) at least 2 branches each of ethyl and n-hexyl or longer and at least one n-butyl per 1000 methylene groups, wherein there are more ethyl branches than butyl branches;
- and
- (iii) only branches of the formula —(CH2CH2)nH, wherein n is 1 or more.
A branched polyethylene which has fewer than 2 methyl branches per 2000 methylene groups, said fewer than 2 methyl branches excluding end groups, at least 2 branches of ethyl and n-hexyl or longer and at least one n-butyl per 1000 methylene groups, wherein there are more ethyl branches than butyl branches, said polyethylene having an intrinsic viscosity in 1,2,4-trichlorbenzene at 150° C. defined by:
- [η]>0.0007 Mw0.63
- wherein Mw is the weight average molecular weight.
Dependencies are inferred from the claim text.