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AssigneeBASF SE
InventorsWolfgang Jarre, Gerhard Mueller, Otmar Zipp, Eckhard Ropte
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The invention concerns a process for the manufacture of flame resistant flexible polyurethane foams by reacting a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates having a functionality greater than 2 containing 40 to 90 percent by weight diphenylmethane diisocyanate based on the total weight of said mixture; polyols, cyanic acid derivatives such as cyanamide, dicyandiamide, guanidine, biguanidine, melamine, cyanuric alkyl esterhydrazides and -amides as flame inhibitors, and blowing agents; as well as, possibly, chain extenders and other additives. The flexible polyurethane foams are suited for the familiar areas of applications, but especially as sound-insulation material for the construction industry.
A process for the manufacture of flame-resistant flexible polyurethane foams by a reaction of aromatic polyisocyanates, polyols, flame inhibitors, and blowing agents as well as optionally, chain extenders and additives, wherein a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates containing 40 to 90 percent by weight diphenylmethane diisocyanates based on the total weight of said mixture is used as aromatic polyisocyanate, and that a cyanic acid derivative selected from the group consisting of cyanamide, dicyandiamide, guanidine, biguanidine, cyanoguanidine, guanidine carbonate, cyanuric acid alkyl ester having 1 to 10 carbon atoms in the alkyl radical, cyanuric acid hydrazide, and melamine is used as the flame inhibitor, and water is used as the blowing agent.
Flexible polyurethane foams prepared by the reaction of aromatic polyisocyanates, polyols, flame inhibitors, blowing agents and optionally chain extenders and additives, wherein a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates containing 40 to 90 percent by weight diphenylmethane diisocyanates based on the total weight of said mixture is used as the aromatic polyisocyanate, and that a cyanic acid derivative selected from the group consisting of cyanamide, dicyandiamide, guanidine, biguanidine, cyanoguanidine, guanidine carbonate, cyanuric acid alkyl ester having 1 to 10 atoms in the alkyl radical, cyanuric hydrazide, and melamine is used as the flame inhibitor and water is used as the blowing agent.
Dependencies are inferred from the claim text.