Polyether polyol and polyol system liquid
To provide a polyether polyol having a high degree of freedom in the design of a polyurethane foam, and capable of providing a polyol system solution excellent in storage stability. A polyether polyol having a polyoxyalkylene chain consisting of oxyalkylene units, and having a degree of unsaturation of at most 0.020 meq/g, a hydroxy value of from 1 to 80 mgKOH/g, a content of oxyethylene units of from 0 to 50 mass %, and a content of ultra-high molecular weight components which have molecular weights of from 12 to 46 times the number average molecular weight of at most 1,000 mass ppm. The number average molecular weight is a molecular weight as calculated as polystyrene measured by gel permeation chromatography (GPC) method, and the content of ultra-high molecular weight components is a value measured by high performance liquid chromatography (HPLC) method using a charged aerosol detector (CAD).
1. A polyether polyol having a polyoxyalkylene chain consisting of oxyalkylene units, and having a degree of unsaturation of at most 0.020 meq/g, a hydroxy value of from 1 to 80 mgKOH/g, a content of oxyethylene units to the total mass of the polyether polyol of from 0 to 50 mass %, a number average molecular weight which is a molecular weight as calculated based on a polystyrene standard determined by gel permeation chromatography of from 2,000 to 50,000, and ultra-high molecular weight components, which have molecular weights of from 12 to 46 times the number average molecular weight of the polyether polyol, that are present in an amount not more than 1,000 mass ppm.
2. The polyether polyol according to claim 1 , which has an average number of hydroxy groups per molecule of the polyether polyol of from 2 to 8.
3. The polyether polyol according to claim 1 , wherein the oxyalkylene unit has from 2 to 4 carbon atoms.
4. The polyether polyol according to claim 1 , wherein at least part of the oxyalkylene units at the terminal of the polyoxyalkylene chain are oxyethylene units.
5. The polyether polyol according to claim 1 , which contains oxypropylene units as the oxyalkylene units other than oxyethylene units, and has a content of the oxypropylene units of at least 50 mass %.
6. The polyether polyol according to claim 1 , which is a polyether polyol obtained by subjecting propylene oxide to ring-opening addition polymerization to an initiator, and then subjecting ethylene oxide to ring-opening addition polymerization.
7. The polyether polyol according to claim 6 , which is a polyether polyol obtained by conducting the ring-opening addition polymerization of propylene oxide in the presence of a double metal cyanide complex catalyst.
8. The polyether polyol according to claim 1 , for producing a polyurethane foam.
9. The polyether polyol according to claim 8 , wherein the polyurethane foam is a flexible polyurethane foam.
10. A composition for producing a polyurethane foam, which contains the polyether polyol as defined in claim 1 .
11. A polyol system solution, which contains the polyether polyol as defined in claim 1 , a catalyst, and a blowing agent.
12. The polyol system solution according to claim 11 , which is a polyol system solution for producing a polyurethane foam by molding method.
13. The polyether polyol according to claim 1 , wherein the content of ultra-high molecular weight components is determined by CAD-HPLC.