Patent ID: 6951904
Filing Date: 2005-10-04
Classification: C08F,C08K,C08L

Abstract:
1. A process for increasing the melt strength and/or the extensional melt viscosity of a polypropylene (co)polymer, the process comprising melt mixing a polypropylene (co)polymer in the presence of an initiator and optionally a monoene monomer wherein said initiator is selected from the group defined by formula 1: wherein R is selected from the group consisting of optionally substituted C 1 to C 18 acyl, optionally substituted C 1 to C 18 alkyl, aroyl defined by formula 2, and groups 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; wherein the melt strength and/or the extensional melt viscosity of the polypropylene (co)polymer is increased during the melt mixing step.