| abstract |
A polymerisation process which comprises ncontacting at least one polar acrylic type or maleimide nmonomer under polymerisation conditions with (i) a ntetracoordinate organosilicon, organotin or norganogermanium initiator having at least one initiating nsite, (ii) a co-catalyst which is a source of fluoride, nbifluoride, cyanide or azide ions or a Lewis acid, and n(iii) from 0.1 to 10% by weight, based on the weight of nmonomer, of acetonitrile. |