LATENT METALLOCENE CATALYTIC SYSTEMS FOR OLEPHINE POLYMERISATION Russian patent published in 2008 - IPC C08F2/42 C08F2/40 C08F10/00 

FIELD: chemistry.

SUBSTANCE: invention concerns metallocene catalytic systems for olephine polymerisation. It claims a method of temporal reversible passivation with further reactivation of active metallocene catalytic system. The catalytic system includes substrate coated with metallocene of 4 or 5 group metal and alumoxane co-catalyst with mol ratio of co-catalyst aluminum for metallocene metal of 50:1 to 2000:1. The method involves contacting of the catalytic system with an effective amount of passivator selected out of oxygen, metal alkoxides, simple ethers, cyclic ethers, alkylamines, cycloalkylamines, metal amides and morpholine; introduction of passivated metallocene catalytic system to a polymerisation reactor and further reactivation of the metallocene catalytic system in the reactor by contacting with metal alkylating reagent taken in the effective amount for monomer polymerisation catalyst activation in polymerisation environment. After passivation and further reactivation the catalytic system activity in polymerisation environment is reduced not more than by 50% of the catalytic system activity before contact with the passivator. Also the invention claims a method of C₂-C₁₄olephine polymerisation including stages (a) of temporary reversible passivation of active metallocene catalytic system.

EFFECT: reduction of the catalyst activity to the level sufficient for catalyst feeding to the reactor together with olephine monomer and for adequate dispersion of the catalyst in polymer layer in the reactor before the catalyst is reactivated.

6 cl, 7 ex, 2 tbl