. "t De Nemours And CompanySulfonated aliphatic-aromatic copolyetherestersUS763574531 Ene 200622 Dic 2009Eastman Chemical CompanyEconomically viable method of recovering sulfopolyester from wash water for subsequent reuse; sulfopolyester may be recovered and reused by processes such as evaporation and/or nanofiltration; final recovery of sulfopolyester may be achieved by further evaporation of water" . . .