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 293/00 (2006.01) C08F 297/08 (2006.01)

Patent

CA 1126899

ABSTRACT OF THE DISCLOSURE A novel process is proved herein for producing propylene- ethylene block copolymers by a three-step polymerization technique using a stereoregular catalyst. 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 polymerization 60 to 95% by weight of the total polymerization amount. The second-step polymerization is carried out by supplying a propylene/ethylene mixture so that the ethylene/ propylene reaction ratio is 41/59 to 69/31, thereby polymerizing 1 to 20% by weight of the total polymeriztion amount. Finally, the third-step polymerization is carried out by supplying ethylene alone or a propylene/ethylene mixture so that the ethylene/propylene reaction ratio is 90/10 or more, thereby polymerizing 4 to 35% by weight of the total polymerization amount. Each polymerization step of the first to third steps is carried out batchwise. The process described above can given propylene-ethylene block copolymers which are markedly well balanced in impact strength, stiffness, transparency and impact blushing.

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