Patent ID: 6521710
Filing Date: 2003-02-18
Classification: C08F,C09J

Abstract:
A process for preparing a grafted polymer wherein a first stepA) a stable nitroxyl radical is grafted onto a polymer, which step comprises heating a polymer and a nitroxyl-ether containing a group (>NO-X) to a temperature between 150Â° C. and 300Â° C. in a reactor suitable for mixing a polymer melt, wherein X is selected such that cleavage of the O-X bond occurs and a radical Xâ€¢ is formed at about the melting temperature of the polymer; and in a second stepB) 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., whereinX is selected from the group consisting of C1-C18alkyl, C3-C18alkenyl, C3-C18alkinyl, phenyl, phenyl(C7-C11)alkyl, phenyl or phenyl(C7-C11)alkyl substituted by C1-C12alkyl, C1-C12alkoxy, OH, amino, C1-C12alkylamino, C1-C12dialkylamino, NO2 or halogen, C2-C7cycloalkyl, or a group whereinR20, R21, and R22 are hydrogen or C1-C12alkyl, C2-C12alkenyl, phenyl or C3-C7cycloalkyl.