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US 10,538,645 B2Granted
Polypropylenes having balanced strain hardening, melt strength, and shear thinning
AssigneeExxonMobil Chemical Patents Inc.
InventorsGeorge J. Pehlert, Mosha H. Zhao
Life of this patent
Estimating the term…
Abstract
A composition comprising the reaction product of a polypropylene comprising at least 50 mol % propylene, and having a molecular weight distribution (Mw/Mn) greater than 6, a branching index (g′vis) of at least 0.97, and a melt strength greater than 10 cN determined using an extensional rheometer at 190° C.; and within the range from 0.01 to 3 wt % of at least one organic peroxide, by weight of the polypropylene and organic peroxide. Such hyperbranched polypropylenes are useful in films, foamed articles, and thermoformed articles.
Claims17
A composition comprising the reaction product of:
- a polypropylene comprising at least 50 mol % propylene, and having a molecular weight distribution (Mw/Mn) greater than 6, an Mz/Mw value of greater than or equal to 2.8, a branching index (g′vis) of at least 0.97, and a melt strength greater than 10 cN determined using an extensional rheometer at 190° C.;
- and
- within the range from 0.01 to 3 wt % of at least one organic peroxide, by weight of the polypropylene and organic peroxide.
Dependencies are inferred from the claim text.