CATALYST SYSTEM AND METHOD OF PREPARING POLYDIOLEFINS Russian patent published in 1999 - IPC

FIELD: chemical industry. SUBSTANCE: described is catalyst system for polymerization of diolefins comprising (A)-salt of general formula ML₃ wherein M is Sc,Y or any metal with atomic number from 57 to 71, and L is anion, except for halogen, (B) compound of general formula wherein Me is metal belonging to group I, II or III of Periodic Table, R′ is aliphatic or cycloaliphatic radical containing from 1 to 20 carbon atoms, aromatic radical containing from 6 to 20 carbon atoms of hydrogen atom; Z is integer of 1 to 3 which is equal to valency of Me provided that if Z is 3, only one of three groups R′ bonded with metal is hydrogen, and (B) organometallic compound is boron compound of general formula: R23-m

(C₆H_5-nR3n) wherein R² is linear or branched aliphatic radical containing from 1 to 20 carbon atoms, cycloaliphatic radical containing from 6 to 20 carbon atoms; aromatic radical, containing from to carbon atoms; R³ is F or CF₃; m is integer of 1 to 3, and n is integer of 1 to 5. The resulting polymers have high content of 1,4-units and changeable ratio between 1,4-dis and 1,4- trans units if desired, and also narrow molecular weight distribution. EFFECT: more efficient catalyst system. 14 cl, 28 ex, 4 tbl