Patent ID: 8247467

Claim:
A process comprising, reacting: a) at least one polyisocyanate with b) at least one compound having at least two hydrogen atoms which are reactive toward isocyanate groups in the presence of c) at least one blowing agent, wherein the component b) comprises at least one polyether carbonate polyol bi) which is prepared by a process comprising introducing at least one alkylene oxide via a stream and carbon dioxide via a stream into a reaction chamber comprising a starter compound and a DMC catalyst, reacting the at least one alkylene oxide and carbon dioxide with the starter compound in the presence of the DMC catalyst during said introducing, and terminating the carbon dioxide stream before terminating the at least one alkylene oxide stream, thereby obtaining the at least one polyether carbonate polyol bi) having a functionality of at least 2, a hydroxyl number of from 10 to 500 mg KOH/g, a content of carbon dioxide incorporated therein of at least 2% by weight, and a block of pure alkylene oxide units at the end of the polyether carbonate polyol chain.