Synonyms: Poly(sulfonyl-p-phenyleneiminoisophthaloylimino-p-phenylene)(8CI); 4,4'-Diaminodiphenyl sulfone-isophthalic acid copolymer, SRU;4,4'-Diaminodiphenyl sulfone-isophthaloyl chloride copolymer, SRU;4,4'-Diaminodiphenyl sulfone-isophthaloyl chloride polymer, SRU;4,4'-Diaminodiphenyl sulfone-isophthaloyl dichloride polymer, SRU;Bis(4-aminophenyl) sulfone-isophthaloyl chloride copolymer, sru;Bis(4-aminophenyl) sulfone-isophthaloyl chloride polymer, SRU;Bis(4-aminophenyl) sulfone-isophthaloyl dichloride copolymer, SRU; Isophthalicacid-4,4'-sulfonyldianiline copolymer, SRU; Isophthalicacid-4,4'-sulfonyldianiline polymer, SRU; Isophthaloylchloride-4,4'-sulfonyldianiline copolymer, SRU; Sulfon I; p-Aminophenylsulfone-isophthalic acid polymer, sru