Polymers of nonconjugated 1,4-dienes
AssigneeThe Goodyear Tire & Rubber Company
InventorsJoginder Lal, Paul H. Sandstrom
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Abstract
This invention discloses homopolymers and interpolymers of nonconjugated diolefins defined by the formula: ##STR1## where R.sub.1, R.sub.2 and R.sub.3 may be hydrogen, a lower alkyl group containing up to 4 carbon atoms or an aryl group and R.sub.4 may be a lower alkyl group containing up to 4 carbon atoms or an aryl group. It is also disclosed that these homopolymers and interpolymers can be prepared by solution polymerization employing cationic catalyst systems and also coordination catalyst systems. The polymers are either resinous or rubbery in nature.
Claims10
The method of polymerizing at least one non-conjugated diolefin defined by the formula ##STR13## where R.sub.1, R.sub.2 and R.sub.3 are from the group of hydrogen, a lower alkyl group containing up to 4 carbon atoms or an aryl group and R.sub.4 is from the group of a lower alkyl group containing up to 4 carbon atoms or an aryl group, to form homopolymers or interpolymers containing at least 50 mole percent of their repeat units of the structure ##STR14## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are defined as before, said polymerization being conducted in the presence of a coordination catalyst, comprising a mixture of (A) halides, oxyhalides or alcoholates of titanium and/or vanadium and (B) organoaluminum compounds.
The method of polymerizing at least one nonconjugated diolefin defined by the formula ##STR15## where R.sub.1, R.sub.2 and R.sub.3 are from the group of hydrogen, a lower alkyl group containing up to 4 carbon atoms or an aryl group and R.sub.4 is from the group of a lower alkyl group containing up to 4 carbon atoms or an aryl group, said polymerization being conducted in the presence of a cationic catalyst system.
Dependencies are inferred from the claim text.