Catalyst composition

Details Catalyst composition Catalyst composition

2006-06-06

2006-06-06

Teskin, Fred (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S117000, C526S126000, C526S127000, C526S131000, C526S133000, C526S153000, C526S164000, C526S340400, C526S943000

Reexamination Certificate

active

07056994

ABSTRACT:
The present invention relates to a catalyst composition for polymerization of a conjugated diene, comprising: (A) a metallocene-type complex represented by a general formula (I): (C5R1R2R3R4R5)aMXb.Lc(where, M represents a rare earth metal; C5R1R2R3R4R5represents a substituted cyclopentadienyl group; R1to R5represent the same or different hydrocarbon groups (except when R1=R2=R3=R4=R5=a methyl group); X represents a hydrogen atom, a halogen atom, an alkoxide group, a thiolate group, an amide group, or a hydrocarbon group having 1 to 20 carbon atoms; L represents a Lewis basic compound; “a” represents an integer of 1, 2, or 3; “b” represents an integer of 0, 1, or 2; and “c” represents an integer of 0, 1, or 2); and (B) an ionic compound composed of a non-coordinating anion and a cation, and/or an aluminoxane. The present invention provides a catalyst composition for polymerization for production of a polymer having a high content of cis-1,4-configuration in microstructure and a narrow molecular weight distribution.

REFERENCES:
patent: 4520177 (1985-05-01), Jenkins
patent: 6596828 (2003-07-01), Kaito et al.
patent: 2002/0119889 (2002-08-01), Kaita et al.
patent: 8-253521 (1996-10-01), None
patent: 2002-256012 (2002-09-01), None
patent: WO-00/52062 (2000-09-01), None
Kaita, et al., Stereospecific Polymerization of 1,3-Butadiene with Samarocene-Based Catalysts, Macromolecules, 1999, 32, 9078-9079.

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