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US 3,940,379 AGranted
Process for controlled degradation of propylene polymers
AssigneeDart Industries Inc.
InventorsEugene G. Castagna, Albert Schrage, Michael Repiscak
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Abstract
A process is provided for the degradation of propylene polymers comprising contacting a propylene polymer exhibiting a first melt flow rate with oxygen or an oxygen-containing gas and an organic or inorganic peroxide; melting and working and resulting mixture in a high shear zone thereby degrading said propylene polymer; and recovering an essentially odor free propylene polymer exhibiting a second melt flow rate higher than said first melt flow rate.
Claims12
A process for the controlled oxidative degradation and minimized thermal degradation of propylene polymers, comprising:
- contacting a propylene polymer exhibiting a first melt flow rate, with gaseous oxygen and with an organic or inorganic peroxide;
- melting and working said mixture of polymer, oxygen and peroxide in a high shear zone at a temperature and for a time sufficiently low to minimize thermal degradation while subjecting said propylene polymer to substantial oxidative degradation, said polymer being selected from the group consisting of polypropylene and copolymers of propylene and .alpha.-olefins of 2 to 6 carbon atoms;
- and recovering an essentially odor free propylene polymer exhibiting a second melt flow rate higher than said first melt flow rate.
Dependencies are inferred from the claim text.