Process for increasing the melt strength of polypropylene

Details Process for increasing the melt strength of polypropylene Process for increasing the melt strength of polypropylene

C - Chemistry, Metallurgy

08

K

C08K 5/14 (2006.01) C08F 8/00 (2006.01) C08J 3/24 (2006.01) C08L 23/12 (2006.01) C08L 23/26 (2006.01)

Patent

CA 2318611

A process for modifying a polypropylene (co)polymer wherein said process comprises melt mixing the polypropylene (co)polymer in the presence of an initiator wherein said initiator is selected from the group defined by formula (1), wherein R is selected from the group consisting of optionally substituted C1 to C18 acyl, optionally substituted C1 to C18 alkyl, aroyl defined by formula (2), and compounds of formula (3), wherein U, V, X, Y, Z, U', V', X', Y' and Z' are independently selected from the group consisting hydrogen; halogen; C1-C18 alkyl; C1-C18 alkoxy, aryloxy, acyl, acyloxy, aryl, carboxy, alkoxycarbonyl, aryloxycarbonyl, trialkyl silyl, hydroxy, or a moiety of formula (4), and wherein T is alkylene.

L'invention porte sur un procédé de modification d'un copolymère de polypropylène consistant à mélanger à l'état fondu ledit copolymère de polypropylène en présence d'un initiateur choisi dans le groupe défini par la formule (1) où R est sélectionné parmi C¿1? à C¿18? acyle facultativement substitué, C1 à C18 alkyle facultativement substitué, aroyle défini par la formule (2), et les composés de formule (3) dans laquelle U, V, X, Y, Z, U', V', X', Y' et Z', sont choisis indépendamment parmi H, halogène, C1 à C18 alkyle, C1 à C18 alkoxy, aryloxy, acyle, acyloxy, aryle, carboxy, alkoxycarbonyle, trialkylsilyle, hydroxy ou un fragment de la formule (4), et dans laquelle T est alkylène.

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