Alkaline barium alcoholates

Details Alkaline barium alcoholates Alkaline barium alcoholates

1976-04-23

1977-04-26

Evans, Joseph E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260617R, C07C 2900, C07C 3130, C07C 3521

Patent

active

040201155

ABSTRACT:
This invention relates to the preparation of solution polymers and rubbers from vinyl monomers using a new catalyst complex of a barium di-tert-alkoxide-hydroxide salt and an organic lithium compound. In particular, homopolymers and copolymers of butadiene with styrene and/or isoprene, prepared with this catalyst, are uniquely characterized by the butadiene units having a low vinyl content (not over about 12%) and a trans-1,4 structure of from about 70 to 81%. Also, the copolymer has a random comonomer sequence distribution. This molecular structure permits elastomers containing little or no styrene to have sufficient stereoregularity to crystallize. Furthermore, the butadiene homopolymer and copolymer with styrene and/or isoprene exhibit a broad molecular weight distribution as well as tack and green-strength which are valuable properties for a rubber to possess when building tires.

REFERENCES:
patent: 3009964 (1961-11-01), Russell
patent: 3094546 (1963-06-01), Towers
patent: 3100750 (1963-08-01), Bailey et al.
patent: 3210404 (1965-10-01), Durr et al.
patent: 3971833 (1976-07-01), Lenz et al.
Turova et al, "Russian Chemical Reviews", vol. 34 (Mar. 1965), pp. 161-185.

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