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US 4,020,115 AGranted
Alkaline barium alcoholates
AssigneeThe General Tire & Rubber Company
InventorsIvan Glen Hargis, Russell Anthony Livigni, Sundar Lal Aggarwal
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AssigneeThe General Tire & Rubber Company
InventorsIvan Glen Hargis, Russell Anthony Livigni, Sundar Lal Aggarwal
Estimating the term…
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.
A compound having the formula ##STR5## where at least one R is a methyl or cyclohexyl radical and where the remaining Rs are selected from the group consisting of alkyl and cycloalkyl radicals having from 1 to 6 carbon atoms which may be the same or different, and where the mol ratio of a to b is from about 99.5:0.5 to 88:12.
The method for making a compound having the formula ##STR6## where at least one R is a methyl or cyclohexyl radical and where the remaining Rs are selected from the group consisting of alkyl and cycloalkyl radicals having from 1 to 6 carbon atoms which may be the same or different, and where the mol ratio of a to b is from about 99.5:0.5 to 88:12 which comprises under an inert atmosphere reacting barium metal in liquid NH.sub.3 or amine solvent for said barium with a tertiary carbinol having the formula ##STR7## where R is the same as defined about and H.sub.2 O, the mol ratio of said carbinol to H.sub.2 O being from about 99.5:0.5 to 88:12, the temperature during reaction being from about -100.degree. C. up to the boiling point of the solvent, said amine being selected from the group consisting of saturated non-chelating non-polymerizable aliphatic, cycloaliphatic and heterocyclic primary and secondary monoamines and polyamines and mixtures of the same having from 1 to 12 carbon atoms and from 1 to 3 nitrogen atoms, and removing said compound from said NH.sub.3 or amine solvent and any excess carbonol at the end of the reaction.
Dependencies are inferred from the claim text.