Exxonmobil Chemical Patents Inc.

Edward F Allen, Jr

George James Pehlert

Stefan B Ohlsson

Alan Joseph Oshinski

Juliet Bauer Wagner

Sasha P Schmitt

Roger P Volmer

Edward Y Bylina

Sasha L Schmitt

A process comprising combining a polymerization catalyst with propylene at a polymerization temperature to produce polypropylene granules having an MFR1, wherein the temperature of the polypropylene granules is maintained at least at the polymerization temperature; mixing the polypropylene granules with an organic peroxide at a temperature of at least the polymerization temperature for a residence time of at least 40 seconds at a temperature below the melting point temperature of the polypropylene granules to form a polypropylene product having an MFR2, wherein MFR1 is greater than MFR2.

Process to produce strain hardened polypropylene

A process to prepare a polypropylene, and the polypropylene and films therefrom, comprising combining a high melt strength polypropylene comprising at least 50 mol % propylene, and having a molecular weight distribution (Mw/Mn) greater than 6, a branching index (g') of at least 0.95, and a melt strength of at least 20 cN determined using an extensional rheometer at 190&#xb0; C., and within the range from 20 to 1000 ppm of a long half-life organic peroxide, and isolating the polypropylene, wherein the polypropylene thus formed has a molecular weight distribution (Mw/Mn) within a range of from 7 to 22, a z-average molecular weight of less than 1,600,000 g/mole, a branching index (g&#x2032;) of at least 0.95; and a melt strength less than 20 cN.

Polypropylene for films and the films therefrom

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Houston, TX, United States of America

Edward F Allen, Jr