Synonyms: Poly(oxy-4,4'-biphenylyleneoxy-p-phenylenecarbonyl-p-phenylene)(8CI); 4,4'-Biphenol-4,4'-difluorobenzophenone copolymer, sru;4,4'-Biphenyldiol-4,4'-difluorobenzophenone copolymer, sru;4,4'-Difluorobenzophenone-4,4'-dihydroxybiphenyl copolymer, SRU; PEDEK