Patent WO-2014097245-A1 (WO)
Title: Process for the preparation of (co) polymers of conjugated dienes in the presence of a catalytic system comprising a bis-imino-pyridine complex of cobalt
Inventor: MASI FRANCESCO
IPC: C08F36/06
Filed: 2013-12-20
Abstract: Process for the preparation of (co) polymers of conjugated dienes which comprises polymerizing at least one conjugated diene in the presence of a catalytic system comprising at least one bis-imino-pyridine complex of cobalt having general formula (I) : wherein : R 2  and R 3 , equal to or different from each other, represent a hydrogen atom; or they are selected from linear or branched C 1 -C 20  preferably C 1 -C 15 , alkyl groups, optionally halogenated, cycloalkyl groups optionally substituted, aryl groups optionally substituted; R 1  and R 4 , different from each other, represent a hydrogen atom; or they are selected from linear or branched C 1 -C 20  preferably C 1 -C 15 , alkyl groups, optionally halogenated, cycloalkyl groups optionally substituted, aryl groups optionally substituted; arylalkyl groups; or R 1  and R 2  can be optionally bound to each other to form, together with the other atoms to which they are bound, a cycle containing from 3 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted with linear or branched C 1 -C 20 , preferably C 1 -C 15 , alkyl groups, said cycle optionally containing other heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; or R 3  and R 4 , can be optionally bound to each other to form, together with the other atoms to which they are bound, a cycle containing from 3 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted with linear or branched C 1 -C 20 , preferably C 1 -C 15 , alkyl groups, said cycle optionally containing other heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; R 5 , R 6  and R 7 , equal to or different from each other, represent a hydrogen atom, or they are selected from linear or branched C 1 -C 20 , preferably C 1 -C 15 , alkyl groups, optionally halogenated, cycloalkyl groups optionally substituted; aryl groups optionally substituted; arylalkyl groups; or R 5  and R 6 , can be optionally bound to each other to form, together with the other atoms to which they are bound, a cycle containing from 3 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted with linear or branched C 1 -C 20 , preferably C 1 -C 15 , alkyl groups, said cycle optionally containing other heteroatoms such as, for example, oxygen, -sulfur, nitrogen, silicon, phosphorous, selenium; or R 6  and R 7 , can be optionally bound to each other to form, together with the other atoms to which they are bound, a cycle containing from 3 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted with linear or branched C 1 - C 20 , preferably C 1 -C 15 , alkyl groups, said cycle optionally containing other heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; X 1  and X 2 , equal to or different from each other, represent a halogen atom such as, for example, chlorine, bromine, iodine; or they are selected from linear or branched C 1 -C 20 , preferably C 1 -C 15 , alkyl groups, -OCOR 8  groups or -OR 8  groups wherein R 8  is selected from linear or branched C 1 -C 20  / preferably C 1 -C 15 , alkyl groups.