Aromatic coupling copolymerization of 5,5'-bis(4-chlorobenzoyl)-2,2'-dimethoxybiphenyl (1) and 5,5'-bis(3-chlorobenzoyl)-2,2'-dimethoxybiphenyl (2) has successfully afforded higher-molecular-weight polyketones than either of the corresponding homopolymerizations. The wholly aromatic copolyketones thus obtained have highly amorphous nature with high glass transition temperatures (T-g). (C) 2003 Elsevier B.V. All rights reserved.