| abstract |
PURPOSE: To provide a polyol prepared by the co-condensation of poly- tetramethylene ether glycol, a polyoxyalkylenediol and an aromatic polybasic acid, and giving a polyurethane storable stably at normal temperature and having excellent hydrolysis resistance, heat-resistance, chemical-resistance and adhesivity. n CONSTITUTION: The objective polyether ester polyol can be prepared by the co-condensation of (A) a polytetramethylene ether glycol having a molecular weight of 300W3,000, (B) a polyoxyalkylenedil having a molecular weight of ≤1,000 and obtained by the addition polymerization of an alkylene oxide to a compound having two hydroxyphenyl groups or a dihydric phenol, and if necessary, (C) a polyol having a molecular weight of ≤500. A polyurethane can be produced from the polyol. The reaction is carried out in nitro-gen-tream in the presenced of a catalyst at 100W250°C for 10W30 hr under dehydration or dealcoholation under reduced pressure. The hydroxyl value of the polyol is preferably 35W140 mg KOH/g. n COPYRIGHT: (C)1986,JPO&Japio |