Title: Alkaline earth metal organometallic compounds, their preparation by metallation and catalysts comprising same

Abstract: Organometallic compounds of high carbanion yield are prepared by metallation with barium, strontium or calcium or mixture of the same of certain acidic organic compounds having a pKa value of between about 15 and 35 on the MSAD scale in the presence of aprotic polar solvents, e.g., barium reacted with xanthene in 1,2-dimethoxyethane to yield dixanthenyl barium. Such organometallic compounds formed by metal-hydrogen exchange reaction are useful in initiating anionic growth-type polymerization of monomers, e.g., alkylene oxides and vinyl compounds, to form homopolymers and copolymers. The persistence of polymer carbanions created by such catalysts makes possible the controlled preparation of a variety of polymers, including block copolymers.

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Inventors: Hargis, Ivan Glen (Tallmadge, OH, US)
Livigni, Russell Anthony (Akron, OH, US)

Application Number: 681499
Filing Date: 1976-04-29
Publication_date: 1977-03-15
Assignee: The General Tire & Rubber Company (Akron, OH)
Primary Class(es): 502/155 502/156
Other Classes:
US Patent Ref:

3509067	Apr, 1970	Bostick	252/431.
3965080	Jun, 1976	Hargis et al.	252/431.

Other Refs:
Primary Examiner: McCarthy, Helen M.
Assistant Examiner:
Attorney: Palmer; Carroll