Process for producing high melt strength polypropylene
AssigneeNouryon Chemicals International B.V.
InventorsWilhelm Klaas Frijlink, Jan Martijn Van Der Schuur, Auke Gerardus Talma, Waldo Joseph Elisabeth Beek, Hendrikus Johannes Maria Kamp
Life of this patent
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Abstract
A process for enhancing the melt strength of polypropylene by extruding said polypropylene in a twin-screw extruder, under inert atmosphere, at a temperature between about 150° C. and about 300° C., and in the presence of about 0.1 to about 3.0 wt %, based on the weight of the polypropylene, of a para-substituted dibenzoyl peroxide.
Claims20
A process for enhancing the melt strength of polypropylene, the process comprising the steps of:
- extruding a polypropylene homopolymer in a twin-screw extruder, under inert atmosphere comprising an oxygen concentration of below about 1 vol %, at a temperature in the range of from about 150° C. to about 300° C., and in the presence of about 0.1 to about 3.0 wt %, based on the weight of the polypropylene, an organic peroxide with the formula
- wherein each R is individually selected from C1-5 alkyl groups.
A process for enhancing the melt strength of polypropylene, the process comprising the steps of:
- extruding a polypropylene homopolymer in a twin-screw extruder, under inert atmosphere comprising an oxygen concentration of below about 1 vol %, at a temperature of from about 160° C. to about 210° C., and in the presence of about 1.5 to about 1.7 wt %, of di(para-methylbenzoyl) peroxide based on the weight of the polypropylene to form a polypropylene having a melt strength of 16 to 17 cN measured using a Goettfert Rheograph 20 capillary rheometer in combination with a Goettfert Rheotens 71.97.
A process for enhancing the melt strength of polypropylene, the process comprising the steps of:
- extruding a polypropylene homopolymer in a twin-screw extruder, under inert atmosphere comprising an oxygen concentration of below about 1 vol %, at a temperature in the range of from about 155° C. to about 250° C, and in the presence of about 0.5 to about 2.0 wt %, based on the weight of the polypropylene, di(4-methylbenzoyl)peroxide.
Dependencies are inferred from the claim text.