HETEROGENISATION OF ZIRCONOCENE ALUMINOHYDRIDES ON ORGANIC CARRIERS FOR THE POLYMERISATION OF ETHYLENE.

摘要

The invention relates to a method for carrying highly active zirconocene aluminohydrides (Cp2ZrH3AlH2) on polymer carriers produced from processes of miniemulsion polymerisation, based on cross-linked and functionalised polystyrene particles. The carriers based on polystyrene were produced by miniemulsion using divinylbenzene (DVB) and acrylic acid as comonomers and surfactants that are polymerisable and commercial (Noigen RN-50), which confer ethylene oxide functionalities to the surface of the polystyrene particles. The cross-linked polystyrene particles exhibited average particle diameters of between 90 and 238 nm, where the zirconocene aluminohydride was also used in copolymerisations of ethylene and alfa-olefins, as 1-hexene. The morphology of the ethylene copolymers and polyethylenes produced was clearly improved compared with the morphology obtained in the polymerisations of ethylene using the same catalytic system carried on modified porous silica.