Patent ID: 6525151
Filing Date: 2003-02-25
Classification: C08F,C08L,C09D,C09J

Abstract:
A process for the preparation of a grafted polymer wherein in a first stepA) a stable nitroxyl radical is grafted onto a polymer, which step comprises heating a polymer and a stable nitroxyl radical (NO.) to a temperature between 150Â° C. to 300Â° C. in a reactor suitable for mixing a polymer melt; and in a second step B) the grafted polymer of step A) is heated in the presence of an ethylenically unsaturated monomer or oligomer to 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 below 60Â° C.