Preparation of solution polymers

Details Preparation of solution polymers Preparation of solution polymers

C - Chemistry, Metallurgy

07

F

402/374, 402/419

C07F 3/00 (2006.01) C08F 210/18 (2006.01) C08F 212/08 (2006.01)

Patent

CA 1075255

ABSTRACT OF THE DISCLOSURE 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, pre- pared 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 crystal- lize. 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.

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