K. Kallio et al., Effect of light on the activity of metallocene catalysts in the gas-phase polymerisation of ethylene, MACRO RAPID, 22(16), 2001, pp. 1330-1334
It was found that halogen fight can have a strong effect on the polymerisat
ion activity of silica-supported metallocene catalysts, Three different met
allocene catalysts have been tested in the gas-phase polymerisation of ethy
lene. The effect of activation depends not only on the type of transition m
etal, but also on the wavelength and intensity of light, The activation by
light was found to be a reversible process.