| http://www.w3.org/ns/prov#value | - The above radical initiators can be used alone or in combination of at least two of them. [0042] When the polyolefin is a polymer of an alpha-olefin having 3 or more carbon atoms, for example polypropylene, the grafting reaction is preferably carried out in the presence of a co-agent which inhibits polymer degradation by beta scission in the presence of means capable of generating free radical sit
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