Molecular weight regulation of cis-1,4-polybutadiene
AssigneeThe Goodyear Tire & Rubber Company
InventorsKenneth F. Castner, Paul H. Sandstrom
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Abstract
There is disclosed a process for the regulation of the molecular weight of high cis polybutadiene prepared by polymerizing butadiene under solution polymerization conditions employing as the catalyst system a mixture of (a) organoaluminum compounds; (b) organonickel compounds; and (c) fluorine containing compounds; said polymerization being conducted in the presence of nonconjugated diolefins of the formula of the structure ##STR1## wherein R.sub.1 may be; --CH.sub.2 --; --C.sub.2 H.sub.4 --; --C.sub.3 H.sub.6 --; ##STR2## and R.sub.2 may be H, --CH.sub.3, --C.sub.2 H.sub.5 or --C.sub.3 H.sub.7 and R.sub.2 is trans to R.sub.1.
Claims14
A process for the regulation of the molecular weight of high cis polybutadiene prepared by polymerizing butadiene under solution polymerization conditions, employing as the catalyst, a mixture of (a) organoaluminum compounds;
- (b) organonickel compounds;
- and (c) fluorine containing compounds;
- said polymerization being conducted in the presence of a molecular weight regulator comprising nonconjugated diolefins of the formula:
- ##STR8## wherein R.sub.1 is a member selected from the group consisting of --CH.sub.2 --;
- --C.sub.2 H.sub.4 --;
- --C.sub.3 H.sub.6 ;
- ##STR9## and wherein R.sub.2 is a member selected from the group consisting of H, --CH.sub.3, --C.sub.2 H.sub.5 and --C.sub.3 H.sub.7 and wherein R.sub.2 is trans to R.sub.1, said molecular weight regulator being employed in amounts ranging from 0.06 to 10 parts per 100 parts of butadiene.
Dependencies are inferred from the claim text.