polyether polyols from recycled polymers and waste streams

摘要

The present invention relates to polyester polyols made from aromatic polyacid sources, such as thermoplastic polyesters. the polyols may be made by heating a thermoplastic polyester, such as virgin polyethylene terephthalate, recycled polyethylene terephthalate or mixtures thereof, with a glycol to provide a digested intermediate which is then reacted with a digestible polymer which may be obtained from various streams of recycling waste. polyester polyols comprise a glycol digested polyacid source and an additional digestible polymer. Polyester polyols provide a sustainable alternative to biochemical or petrochemical based polyols.