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) C08L 23/16 (2006.01)

Patent

CA 2629788

Propylene-ethylene copolymers are flexible and show a very good balance between softness and mechanical properties in their crude state are obtained by solution polymerization in the presence of Ziegler-Natta catalysts. The said copolymers comprise from 10 to 50%wt of ethylene and are characterized by: product of the comonomer reactivity ratio r1~r2 <=1.5; absence of 2,1 propylene insertions and tensile strength at break higher than 4 Mpa.

L'invention concerne des copolymères propylène-éthylène souples et présentant un très bon équilibre entre les propriétés mécaniques et la souplesse à l'état brut, lesdits copolymères étant obtenus par polymérisation en solution en présence de catalyseurs Ziegler-Natta. Lesdits copolymères comprennent de 10 à 50 % en poids d'éthylène et sont caractérisés par: un produit des rapports de réactivité du comonomère r1 r2 =1,5; une absence d'insertions 2,1-propylène et une résistance à la traction à la rupture supérieure à 4 Mpa.

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