GRAFTING OF ETHYLENICALLY UNSATURATED MONOMERS ONTO POLYMERS

摘要

The present invention relates to a process for the preparation of grafted polymers wherein in a first step A) a stable nitroxyl radical is grafted ont o a polymer, which step comprises heating a polymer and a stable nitroxyl radical (NO•); and in a second step B) the grafted polymer of step A) is heated in the presence of an ethylenically unsaturated monomer or oligomer t o a temperature at which cleavage of the nitroxyl-polymer bond occurs and polymerization of the ethylenically unsaturated monomer or oligomer is initiated at the polymer radical; maintaining said temperature for further polymerization and afterwards cooling down the mixture to a temperature belo w 60 ~C. Further subjects are grafted polymers prepared by said process, the u se of the polymeric radical initiator and the use of NO radicals for grafting polymers.