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Two critical control points were established to eliminate any risk of residual benzene reaching patients: (1) upstream control of benzene in solvents (≤10 ppm) and (2) IPC of residual solvents in polymer-stabilized SDDs.

The synthesis of a new conducting polymer via electrolysis of 2-vinylpyrrole is described. Characterization based on FTIR spectral analysis and electrical conductivity leads us to propose aromatic coupling of the pyrrole rings of adjacent poly(2-vinylpyrrole) chains to form cross-links. This polymer exhibits an electrical conductivity of ~10"6 S/cm. Radical polymerization of the same monomer leads to a linear product which reacts with iodine to give an iodinated, slightly conducting polymer (8 X 10*7 S/cm).