Process for preparing propylene block copolymers

C - Chemistry – Metallurgy – 08 – F

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C08F 297/04 (2006.01) C08F 297/08 (2006.01)

Patent

CA 2053973

ABSTRACT OF THE DISCLOSURE In a two-step polymerization of propylene under the catalysis by a Ziegler catalyst comprising (A) a titanium-containing solid catalyst component such as that based on TiC13 or TiC14 preferably supported on a magnesium compound and (B) an organoaluminum component wherein a crystalline propylene polymer is prepared in the first step and a rubbery propylene copolymer is prepared in the second step thereby to produce a propylene block copolymer or a chemically blended propylene polymer, the improvement which comprises the use as the titanium-containing solid catalyst of that which has undergone a preliminary polymerization of a diolefin compound of 4 to 18 carbon atoms polymerized thereon. Tackiness of propylene block copolymers or chemically blended propylene polymers which is likely to accompany such polymers is reduced.

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