Process for producing α-olefin polymer

Details Process for producing α-olefin polymer Process for producing α-olefin polymer

2005-03-22

2005-03-22

Choi, Ling-Sui (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S351000, C526S123100, C526S124100, C526S124300

Reexamination Certificate

active

06870022

ABSTRACT:
An α-olefin polymer having extremely high stereoregularity, exhibiting excellent fluidity and containing a decreased amount of catalyst residues in the polymer can be obtained industrially advantageously in accordance with a process for producing an α-olefin polymer which comprises homopolymerizing an α-olefin or copolymerizing two or more α-olefins in the presence of (A) a solid catalyst component comprising magnesium, titanium and a halogen, (B) an organoaluminum compound having a content of hydroaluminum compounds of 0.1% by weight or smaller and (C) an organozinc compound.A block copolymer of propylene comprising a homopolymer portion exhibiting high fluidity and a copolymer portion having a high molecular weight can be obtained in accordance with a process for producing a block copolymer of propylene which comprises polymerizing propylene in the presence of (A) a solid catalyst component comprising a titanium compound and an electron-donating agent, (B) an organoaluminum compound and (C) an organozinc compound to produce crystalline polypropylene and copolymerizing propylene and at least one of ethylene and α-olefins having 4 or more carbon atoms in the presence of the produced crystalline polypropylene.

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