PREPOLYMERIZED CATALYST FOR ETHYLENE POLYMERIZATION Russian patent published in 2006 - IPC C08F4/654 C08F210/02 

FIELD: chemical technology, catalysts.

SUBSTANCE: invention relates to components of catalyst used in synthesis of ethylene (co)polymers by using methods of (co)polymerization in the gaseous phase, in suspension or in mass. The prepolymerized catalyst for polymerization of ethylene being optionally in mixtures with olefins of the formula: -CH₂=CHR wherein R represents (C₁-C₁₂)-alkyl group comprises a non-stereospecific solid component of catalyst comprising Ti, Mg and halogen. A solid component of catalyst is prepolymerized with α-olefin of the formula: -CH₂=CHR¹ wherein R¹ represents (C₁-C₈)-alkyl group in the presence of alkylaluminum compound in the mole ratio Al/Ti from 0.001 to 50 in such degree that the amount of α-olefin prepolymer is up to 100 g/g of solid component of catalyst. Also, invention describes a method for (co)polymerization of ethylene that is carried out in the presence of the prepolymerized catalyst and alkylaluminum compound. Invention provides preparing polymers of high bulk density and high activity, and decreasing formation of small particles also.

EFFECT: improved and valuable properties of catalyst.

18 cl, 8 ex