SYNTHESIS OF MACROCYCLIC POLYMERS HAVING LOW HYSTERESIS COMPOUNDED PROPERTIES

摘要

The present invention provides a method of anionicsynthesis of stable macrocyclic polymers that are compounded toform vulcanizable elastomeric compounds exhibiting reducedhysteresis properties. Cyclic organometallic compoundscontaining divalent metal atoms of Groups IIA and IIB of thePeriodic System are employed as initiators of anionicpolymerization of conjugated diene, vinyl aromatic and/or trienemonomers. Coupling of the living ends of the resultingmacrocyclic polymers or copolymers with a coupling agent or acoupling agent that is also a functionalizing agent results instable macrocyclic polymers with improved hysteresis properties.