Arylphenoxy catalyst system for producing ethylene...

Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing

Reexamination Certificate

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C502S103000, C526S160000, C526S172000, C556S053000

Reexamination Certificate

active

07833926

ABSTRACT:
The present invention relates to an arylphenoxy catalyst system producing an ethylene homopolymer or copolymers of ethylene and α-olefins, and a method of producing an ethylene homopolymer or copolymers of ethylene and α-olefins having a high molecular weight under a high temperature solution polymerization condition using the same. The catalyst system includes a group IV arylphenoxy-based transition metal catalyst and an aluminoxane cocatalyst or a boron compound cocatalyst. In the transition metal catalyst, a cyclopentadiene derivative and arylphenoxide as fixed ligands are located around the group IV transition metal, arylphenoxide is substituted with at least one aryl derivative and is located at the ortho position thereof, and the ligands are not crosslinked to each other. The catalyst includes an environmentally-friendly raw material, synthesis of the catalyst is economical, and thermal stability of the catalyst is excellent. It is useful for producing an ethylene homopolymer or copolymers of ethylene and α-olefins having various physical properties in commercial polymerization processes.

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Patent Abstracts of Japan for 63-92621 published on Apr. 23, 1988.
Kotohiro Nomura, et al., Synthesis of Various Nonbridged Titanium(IV) Cyclopentadienyl-Aryloxy Complexes of the Type CpTi(OAr)X2and Their Use in the Catalysis of Alkene Polymerization. Important Roles of Substituents on both Aryloxy and Cyclopentadienyl Groups,Organometallics1998, 17, pp. 2152-2154.
Matthew G. Thorn, et al., Cationic Group 4 metal alkyl compounds containing aryloxide ligation: synthesis, structure, reactivity and polymerization studies, Journal of Organometallic Chemistry 591 (1999) pp. 148-162.

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