Patent ID: 8492511

Claim:
A process for the preparation of a crosslinked polymer with pendant nitroxide groups, comprising reacting a bis nitroxide of formula (A)•ON—Ln—NO• (A) or a polynitroxide of formula (B) Ln—[NO•] n (B) with a bis-functional or polyfunctional organic halogen containing compound in the presence of a transition metal or transition metal salt in its lower oxidation state and a ligand capable of complexing the transition metal or transition metal salt; wherein Ln is a n valent spacer group or a repeating unit connecting the nitroxide groups; n is a number from 3 to 50,000 wherein the molar ratio of the bis or polynitroxide compound of formula (A) or B to the bis-functional or polyfunctional halogen compound is equal or greater than 5:1.