High density polyethylene packaging
AssigneeE. I. Du Pont de Nemours and Company
InventorJohn McNally Cameron
Life of this patent
Estimating the term…
Abstract
High density polyethylene made using a cobalt or iron complex of a selected tridentate ligand as a polymerization catalyst may be made into packaging which has advantageous properties, especially lower permeation to ambient materials such as oxygen and/or water. The packaging, such as bottles, bags and rigid storage tanks, may be formed by conventional methods.
Claims5
A rigid storage tank comprising a high density polyethylene obtained by polymerizing ethylene in the presence of a polymerization catalyst component which comprises an iron or cobalt complex of a compound of the formula (I)
- wherein:
- R1, R2, R3, R4 and R5 are each independently selected from the group consisting of hydrogen, a hydrocarbyl, an inert functional group and a substituted hydrocarbyl;
- and
- R6 and R7 are each independently selected from the group consisting of aryl and substituted aryl.
A process for making a rigid storage tank, comprising the steps of:
- (a) polymerizing ethylene in the presence of a polymerization catalyst component to form high density polyethylene, the polymerization catalyst component comprising an iron or cobalt complex of a compound of the formula
- wherein:
- R1, R2, R3, R4 and R5 are each independently selected from the group consisting of hydrogen, hydrocarbyl, an inert functional group or substituted hydrocarbyl;
- and
- R6 and R7 are aryl or substituted aryl;
- (b) forming said high density polyethylene into said rigid storage tank.
Dependencies are inferred from the claim text.