Patent ID: 9701805
Date: 2017-07-11
CPC Classifications: C08G,C08J

Claim:
1. A polyester polyol comprising structural units derived from ethylene glycol and/or diethylene glycol and structural units derived from at least one long-chain polyether polyol having a number average molar mass of 1500 to 8000 Da, wherein the polyester polyol has a hydroxyl number of 165 to 260 mg, KOH/g, and wherein: (a) a proportion of polyester polyol, structural units derived from the long-chain polyether polyol is from 2 to 30 wt %, based on the mass of the polyester polyol; (b) a proportion of polyester polyol structural units derived from ethylene glycol and/or diethylene glycol is from 35 to 58 wt %, based on the mass of the polyester polyol; and (c) a proportion of polyester polyol structural units derived from an at least difunctional organic acid is from 40 to 75 wt %, based on the mass of the polyester polyol.