C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 8/50 (2006.01) C08L 23/10 (2006.01) C08L 23/02 (2006.01) C08L 23/08 (2006.01) C08L 23/16 (2006.01) C08L 23/20 (2006.01) C08L 25/04 (2006.01)
Patent
CA 2370941
The invention relates to a method for the production of a controlled rheological homopolymer or copolymer of propylene or a composition comprising a homopolymer or copolymer of propylene in the absence of a functional monomer. The inventive method increases the melt flow index of the resin by cutting the chains and is characterised in that at least one stable free radical is incorporated into the resin in a viscous state, whereupon a solid product is formed having an increased melt flow index. The stable free radical or radicals are more particularly chosen from nixtroxyl radicals, comprising at least one group =N-O•.
Ce procédé de fabrication d'une résine à rhéologie contrôlée d'un homo- ou copolymère du propylène ou d'une composition comprenant un homo- ou copolymère du propoylène en l'absence de monomère fonctionnel, ledit procédé entraînant une augmentation de l'indice de fluidité de la résine par coupure de chaînes, est caractérisé par le fait que l'on incorpore à ladite résine à l'état visqueux au moins un radical libre stable, puisque l'on forme un produit solide ayant un indice de fluidité augmenté. En particulier, on choisit le ou les radicaux libres stables parmi les radicaux nitroxyle, comportant au moins un groupement =N-O•.
Bertin Denis
Robert Patrice
Atofina
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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