Radiation visbroken polypropylene and fibers made therefrom

Details Radiation visbroken polypropylene and fibers made therefrom Radiation visbroken polypropylene and fibers made therefrom

C - Chemistry, Metallurgy

08

F

C08F 110/06 (2006.01) C08F 8/50 (2006.01) C08F 10/06 (2006.01) C08J 3/28 (2006.01) C08L 23/10 (2006.01) C08F 210/06 (2006.01)

Patent

CA 2201436

A propylene homopolymer having a stick-point of 30 cm or less during melt spinning, an oligomer content of less than 1500 ppm without postpolymerization treatment to remove oligomers, and a melt flow rate greater than 300 dg/min is prepared by radiation visbreaking in a multistage fluidized bed reactor. The polymer is subjected to irradiation in the substantial absence of oxygen, followed by a multistage treatment in the presence of a controlled amount of oxygen. The radiation visbreaking process can also be applied to other propylene polymer materials. The propylene polymer materials produced by this radiation visbreaking process can be used, for example, for extrusion coating, film production, and injection molding.

Homopolymère de propylène possédant un stick-point de 30 cm ou moins pendant le filage par fusion, une teneur en oligomères de moins de 1500 ppm sans postpolymérisation pour l'élimination des oligomères, et un débit à chaud de plus de 300 dg/min; cet homopolymère est préparé par photoviscoréduction dans un réacteur à lit fluidisé multi-étagé. Le polymère est soumis à un rayonnement, pratiquement en l'absence d'oxygène, suivi d'un traitement multi-étagé en présence d'une quantité régulée d'oxygène. La photoviscoréduction peut également être appliquée à d'autres polymères du propylène. Les polymères de propylène obtenus par photoviscoréduction peuvent être utilisés par exemple pour le revêtement par extrusion, la production de pellicules et le moulage par injection.

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