Process and catalyst for producing syndiotactic polymers

Details Process and catalyst for producing syndiotactic polymers Process and catalyst for producing syndiotactic polymers

1992-04-24

1993-06-29

Garvin, Patrick P.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Organic compound containing

502103, 502117, 526170, C08F 464

Patent

active

052234681

ABSTRACT:
Syndiospecific catalysts and processes for the syndiotactic propagation of a polymer chain derived from an ethylenically unsaturated monomer which contains 3 or more carbon atoms or is a substituted vinyl compound. The catalysts comprise an unbalanced metallocene cation characterized by a cationic metallocene ligand having sterically dissimilar ring structures joined to a positively charged coordinating transition metal atom, and a stable noncoordinating counter anion for the metallocene cation. The ring structures are substituted cyclopentadienyl rings which are sterically different from one another at sufficiently low kinetic energy states induced by the substituents on the cyclopentadienyl groups to impart a stereorigid relationship relative to said coordinating metal atom to prevent rotation of the rings about their coordination axes at the polymerization temperature. The catalyst is contacted with a C3+ alpha olefin or other ethylenically unsaturated compound in a polymerization reaction zone and maintained in contact with the catalyst in the reaction zone under low temperature polymerization conditions to produce a syndiotactic polymer.

REFERENCES:
patent: 3135809 (1964-06-01), Bosmajian
patent: 4658078 (1987-04-01), Slaugh et al.
patent: 4794096 (1988-12-01), Ewen
patent: 4892851 (1990-01-01), Ewen et al.
Jordan et al., (1), JACS (1986), 108, 7410-11 (no month-available).
Jordan et al., (2), JACS (1986), 108, 1718-19 (no Month Available).
Zambelli et al., Macro-Molecules (1989), pp. 2186-2189 (no month available).

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