US Patent 7282544 Olefin polymerisation process in the presence of an anti-fouling agent

A propylene polymerisation process carried out in the presence of an anti-fouling agent; characterised in that the anti-fouling agent comprises an anti-fouling polymer containing:(1) one or more blocks —(CH2—CH2—O)k— where each k is in the range from 1 to 50; and(2) one or more blocks —(CH2—CH(R)—O)n— where R comprises an alkyl group having from 1 to 6 carbon atoms and each n is in the range from 1 to 50;and terminated by a R′ and a R″ end groups wherein R′ is OH or an alkoxy having from 1 to 6 carbon atoms and R″ is H or an alkyl having from 1 to 6 carbon atoms, and the anti-fouling polymer is solvated in a solvent comprising cyclohexane when added to the polymerisation medium.