Highly stereoregular polypropylene with improved properties

Details Highly stereoregular polypropylene with improved properties Highly stereoregular polypropylene with improved properties

C - Chemistry, Metallurgy

08

F

C08F 4/651 (2006.01) C08F 110/06 (2006.01)

Patent

CA 2492939

Propylene polymers having a content of isotactic pentads (mmmm) higher than 97%, molecular weight distribution, expressed by the formula (a) ratio, equal to or higher than 6 and a value of formula (b) ratio equal to or lower than 5.5. The said polymers are prepared in the presence of a particular combination of Ziegler-Natta solid catalyst components and highly stereoregulating electron-donor compounds. Laminated articles, in particular bi-axially oriented films and sheets, can be prepared with the said polymers.

Polymères de propylène possédant une teneur en pentades isotactiques (mmmm) supérieure à 97 %, une distribution de poids moléculaire, exprimée par le rapport de formule (a), égale ou supérieure à 6 et une valeur de rapport de formule (b) égale ou inférieure à 5,5. Lesdits polymères sont préparés en présence d'une combinaison spéciale de constituants catalytiques et solides de Ziegler-Natta et de composés donneurs d'électrons extrêmement stéréorégulateurs. Des articles laminés, en particulier, des films et des feuils à orientation biaxiale, peuvent être préparés à l'aide desdits polymères.

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