Preparation of solution polymers

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

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252475, 260 63R, 526335, 526340, 526346, 526347, C08F 446, C08F 472, C08F 3606, C08F11208

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040484270

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.

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patent: 3687916 (1972-08-01), Mueller et al.
patent: 3846385 (1974-11-01), Hargis et al.
patent: 3865749 (1975-02-01), Tornqvist et al.
patent: 3896102 (1975-07-01), Naylor

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