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US 4,382,132 AGranted
High pressure polyethylene process
AssigneeEl Paso Polyolefins Company
InventorsJoseph M. Kelley, John J. Roderick
Life of this patent
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Abstract
A process for the high pressure polymerization of ethylene in a reactor in the presence of conventional free radical generating initiators, wherein the initiator material is admixed with certain additives in small concentrations to lower the polymerization initiation temperature.
Claims15
A process for the polymerization of ethylene which comprises
- continuously introducing ethylene to a reaction zone maintained at a pressure of at least 20,000 psi and contacting the ethylene with an initiator solution containing
- (a) at least one free radical generating polymerization initiator
- (b) from about 0.1 to about 2.0 weight percent based on the initiator weight of an accelerator selected from the group consisting of metal complexes with beta-ketones and organometallic salts and
- (c) from about 0.1 to about 2.0 weight percent based on the initiators weight of a coaccelerator selected from the group consisting of amines, distearyl thiodipropionate, dilauryl thiodipropionate, isooctyl thiodipropionate, ditridecyl thiodipropionate, isooctyl thioglycolate, n-dodecyl mercaptan, n-octyl mercaptan, n-lauryl mercaptan, decyl diphenyl phosphite and triphenylphosphite
- and recovering a solid ethylene polymer as a product of the process.
2 more elements
Dependencies are inferred from the claim text.