Process for producing flexible polyurethane foams
AssigneeBASF SE
InventorsDarijo Mijolovic, Stephan Bauer, Stephan Goettke
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Abstract
The invention relates to a process for producing flexible polyurethane foams by reacting a) polyisocyanates with b) compounds having at least two hydrogen atoms which are reactive toward isocyanate groups in the presence of c) blowing agents, wherein the component b) comprises at least one polyether carbonate polyol bi) which can be prepared by addition of carbon dioxide and alkylene oxides onto H-functional starter substances using DMC catalysts and has a functionality of at least 2, a hydroxyl number in the range from 10 to 500 mg KOH/g and a content of incorporated carbon dioxide in the form of carbonate units of at least 2% by weight.
Claims20
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.
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 without terminating the at least one alkylene oxide stream, thereby obtaining at least one polyether carbonate polyol bi), and reacting
- a) at least one polyisocyanate with
- b) at least one compound having at least two hydrogen atoms which are reactive toward isocyanate groups and comprising the at least one polyether carbonate polyol bi) in the presence of
- c) at least one blowing agent,
- wherein the at least one polyether carbonate polyol bi) has
- 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.
Dependencies are inferred from the claim text.