| http://www.w3.org/ns/prov#value | - A preferred aromatic amine compound has the general formula: ##STR7## wherein R19 is selected from the group consisting of a substituted or unsubstituted phenyl group, biphenyl group, diphenyl ether group, alkyl group having from 1 to 18 carbon atoms, and cycloaliphatic group having from 3 to 12 carbon atoms and R20, R21, R23 and R22 are an aromatic group selected from the group consisting of subs
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