| PATENT CLAIMS |
A method for prevn sheeting problems in a gas phase reactor in a multi-phase polymn process, which comprises one or more loop reactors, where alpha-olefins are polymerized or copolymerized in particle form in the presence of catalysts & which loop reactor(s) is followed by a gas phase reactor, where the polymn is continued in the presence of added monomers, & in which process a fouling prevn agent is used to prevent fouling or sheeting in the reactors, characterized in that 30-70% of the end prodt is polymerized in the loop reactor(s), where the whole amount of the fouling prevn agent is added into the loop reactor & that the amount of the fouling prevn agent is higher than necessary to prevent the fouling in the loop reactor
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