AROMATIC POLYESTER POLYOL, ITS PRODUCTION AND RIGID POLYURETHANE FOAM OBTAINED FROM AROMATIC POLYESTER POLYOL

摘要

PROBLEM TO BE SOLVED: To obtain an aromatic polyester polyol for rigid polyurethane foam useful for production of polyurethane foam excellent in low smoke emission, flame retardance and high strength by reacting a polyalkylene terephthalate resin and a glycol. ;SOLUTION: The objective aromatic polyester polyol comprising terephtahlic acid and a glycol component is obtained by reacting (A) a polyalkylene terephthalate resin and (B) a glycol (e.g. diethylene glycol), and has acid value ≤0.4 mg-KOH/g and including ≤60 μg/g of antimony. The preferable hydroxyl value of the polyester polyol is 100-400 mg-KOH/g, and the viscosity is 2,000-6,000 mPa/s at 25°C.;COPYRIGHT: (C)2001,JPO