Fina Technology, Inc.

Total Petrochemicals Research Feluy

Lisa K Albe

Michel Daumerie

Philippe VanDeurzen

Scott Cooper

William R Wheat

Jeff Nairn

William Rusty Wheat

This invention relates to the use of a cyclic ketone peroxide of half-life time larger than one second at a temperature of 225&#xb0; C., for producing a controlled rheology polypropylene heterophasic copolymer of melt index MI2 larger than 15 g/10 min, having simultaneously a very high impact resistance and a high flexural modulus.

Controlled rheology polypropylene heterophasic copolymers

Polypropylene heterophasic copolymers are produced having increased impact strength through the use of controlled rheology techniques by the addition of a peroxide at conditions which increase the deactivation or half life of the peroxide. The increased half life slows down the vis-breaking process and allows better dispersion of rubber particles within the polymer. In this way, copolymers having a high melt flow can be prepared while obtaining high impact strength and lower stiffness values, without the need for additional elastomeric modifiers.

Polypropylene copolymers and method of preparing polypropylene copolymers

Polypropylene copolymers and method of preparing polyproylene copolymers

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Ophain-Bois-Seigneur-Isaac, Belgium

Lisa K Albe