Propylene-ethylene copolymers and process for their preparation

Details Propylene-ethylene copolymers and process for their preparation Propylene-ethylene copolymers and process for their preparation

C - Chemistry, Metallurgy

08

F

C08F 210/06 (2006.01)

Patent

CA 2608321

Random propylene/ethylene copolymers are provided characterized by Ethylene content in the range of 4.5-7%wt; Mw/Mn (via GPC) in the range 3.5-5.5; Mz/Mw (via GPC) lower than 4; absence of 2-1 regioinversion, and Melting Temperature (Tm) (non-nucleated grade) lower than 143~C. The said copolymers show an excellent balance of impact and optical properties which is retained even after visbreaking.

La présente invention concerne des copolymères aléatoires propylène/éthylène caractérisés par une teneur en éthylène comprise dans l'intervalle 4,5-7 % en masse ; par un rapport Mw/Mn (par CPV) compris dans l'intervalle 3,5-5,5 ; par un rapport Mz/Mw (par CPV) inférieur à 4 ; par l'absence de régio-inversion 2-1, et par une température de fusion (Tf) (forme non nucléée) inférieure à 143 °C. Lesdits copolymères présentent un excellent équilibre entre les propriétés d'impact et les propriétés optiques, équilibre conservé même après viscoréduction.

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