US 11,718,705 B2
In-situ formed polyether polyols, a process for their preparation, and a process for the preparation of polyurethane foams
Sharlene A. Lewis, Pittsburgh, PA (US); and Jack R. Reese, Renfrew, PA (US)
Assigned to Covestro LLC, Pittsburgh, PA (US)
Filed by Covestro LLC, Pittsburgh, PA (US)
Filed on Jul. 28, 2021, as Appl. No. 17/386,844.
Prior Publication US 2023/0050523 A1, Feb. 16, 2023
Int. Cl. C08G 18/16 (2006.01); C08G 18/18 (2006.01); C08G 18/20 (2006.01); C08G 18/24 (2006.01); C08G 18/28 (2006.01); C08G 18/48 (2006.01); C08G 18/76 (2006.01); C08G 65/12 (2006.01); C08G 65/26 (2006.01); C08J 9/12 (2006.01); C08L 71/02 (2006.01)
CPC C08G 18/485 (2013.01) [C08G 18/7621 (2013.01); C08G 18/7671 (2013.01); C08G 65/12 (2013.01); C08J 9/125 (2013.01); C08G 2110/0083 (2021.01); C08J 2203/10 (2013.01); C08J 2375/08 (2013.01)] 19 Claims
 
1. An in-situ formed polyether polyol blend having an overall functionality of 2 to 3, an overall hydroxyl number of 40 to 220 mg KOH/g, and comprising:
(a) a monol initiated oxyalkylene ether having a hydroxyl number of less than or equal to 56 mg KOH/g polyol, and containing less than or equal to 20% of copolymerized oxyethylene, based on the total weight of monol initiated oxyalkylene ether (a);
(b) a polyether polyol having a functionality of 2 to 8, a hydroxyl number of 20 to 240 mg KOH/g and containing at least 50% of copolymerized oxyethylene, based on the total weight of component (b);
(c) a polyether polyol having a hydroxyl number of 80 mg KOH/g polyol to 220 mg KOH/g polyol, a nominal functionality of 2, and containing 5 to 45% of copolymerized oxyethylene, based on the total weight of polyether polyol (c);
and
(d) a polyether polyol having a hydroxyl number of 80 mg KOH/g polyol to 220 mg KOH/g polyol, a nominal functionality of greater than 2 to 8, and containing 5 to 45% of copolymerized oxyethylene, based on the total weight of polyether polyol (d);
wherein (a) said in-situ formed polyether polyol blend comprises from 15 to 40% by weight of said monol initiated oxyalkylene ether (a), from 3 to 45% by weight of said polyether polyol (b), from 8 to 30% by weight of said polyether polyol (c), and from 20 to 60% by weight of said polyether polyol (d), with the sum of the %'s by weight of (a), (b), (c) and (d) totaling 100% by weight of said in-situ formed polyether polyol blend.