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US 4,578,431 AGranted
Process for improving melt strength of ethylene polymers by treatment with organic peroxide
AssigneeMobil Oil Corporation
InventorsRichard G. Shaw, Peter J. Canterino
Life of this patent
Estimating the term…
Abstract
Melt strength of polyethylene and ethylene-higher olefin copolymers during processing is improved by pretreating the polymer in melt form at a temperature of at least 230.degree. C. in the presence of an organic peroxide for a period of time equal to at least three times the half-life of the organic peroxide at the melt temperature.
Claims9
A process treating a film-forming copolymer of ethylene and an olefin having 4 to 8 carbons atoms, or of a high density ethylene homopolymer, comprising:
- heating said ethylene copolymer in melt form at a temperature of from about 230.degree. C. to 340.degree. C. in the presence of an effective amount of from 100 ppm to 2000 ppm of an organic peroxide for a period of time equal to at least three times the half-life of the organic peroxide at the heating temperature to increase the melt strength of said copolymer so that the copolymer is suitable for extrusion into a film by blown film extrusion.
Dependencies are inferred from the claim text.