Ethylene polymerization with metallocene/ethyl modified methylaluminoxane catalysts

In order to reduce the cost of the cocataylst in metallocene catalyst systems and accelerate development of functional polyolefin,ethylene polymerization using metallocene in combination with ethyl modified methylaluminoxane(EMMAO) was studied.Triethyllaluminium(TEA)/methylaluminoxane(MAO),ethylaluminoxane(EAO)/MAO and EMMAO was used as cocataylst to investigate ethylene polymerization.The results showed that the presence of triethyllaluminium improved the cocatalytic activity of MAO between o and 0.2 of TEA/MAO mole ratio.The cocatalytic activity of EMMAO,prepared from the mixture of TMA and TEA,approximated to one of MAO when Et/Me mole ratios of EMMAO were from 0 to 0.32.Instead of MAO,using EMMAO would conduce to reduction in cost of metallocene and functional polymer development.