Two firms recently announced ecofriendly production of urethane polyols from recycled PET waste and from chemicals derived from cornstarch by bio-fermentation.

Two firms recently announced ecofriendly production of urethane polyols from recycled PET waste and from chemicals derived from cornstarch by bio-fermentation. The latter development comes from ITWC, Inc., Malcolm, Iowa. It is making Poly SR polyester polyols for elastomers, coatings, and sealants. The polyols are based on Susterra Bio-PDO, propanediol that is obtained 100% from cornstarch. Bio-PDO is a product of DuPont Tate & Lyle BioProducts, LLC, Loudon, Tenn. PUR made with Poly SR is said to be virtually identical in processing and performance to PUR made with standard butanediol. In addition, Petopur GmbH, Schwarzheide, Germany, has begun production of aromatic polyester polyols (APP) from PET waste. In a system designed by H&S Anlagentechik GmbH of Sulingen, Germany, PET is fed into a reactor, where it is heated and mixed with diethylene glycol and chemically converted into highly pure APP. Petopur can make 8.8 million lb/yr of APP. These polyols are said to offer rigid PUR foam processors very low acid content and long shelf life, plus resulting foams with inherent flame retardancy, up to 5% lower density, improved insulation factor, and up to 20% higher compressive strength—all at a “very attractive” price. (888) 489-2462 • www.itwcinc.com +49 3571/40 40 42 • www.petopur.de