Process for producing propylene-ethylene block copolymers

Details Process for producing propylene-ethylene block copolymers Process for producing propylene-ethylene block copolymers

C - Chemistry, Metallurgy

08

F

400/2058

C08F 297/08 (2006.01)

Patent

CA 1126898

ABSTRACT OF THE DISCLOSURE A process for producing propylene-ethylene block copolymers by a three-step polymerization technique using a stereoregular catalyst is provided herein. The first-step polymerization is carried out by supplying propylene alone or a propylene/ethylene mixture so that the ethylene/propylene reaction ratio is 6/94 or less, thereby polymerizing 60 to 95% by weight of the total polymerization amount. The second-step polymerization is carried out by sup- plying a propylene/ethylene mixture so that the ethylene/propylene reaction ratio is 15/85 to 79/21, thereby polymerizing 1 to 20% by weight of the total polymerization amount. The third-step polymerization is carried out by sup- plying a propylene/ethylene mixture so that the ethylene/propylene reaction ratio is 50/50 to 89/11, thereby polymerizing 4 to 35% by weight of the total polymerization amount. The ethylene/propylene reaction ratio in the third step is made larger than that in the second step. The novel process can give propylene-ethylene block copolymers markedly well balanced in impact strength, stiffness, transparency and impact blushing.

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