| abstract |
The present invention relates to flame-retardant flexible polyurethane foams with phosphazene, and to processes for producing flexible PU foams by reacting component A comprising A1nan isocyanate-reactive component, A2nPropellant containing water, A3nif necessary auxiliary and additive, A4nFlame retardants,nwith Bnan isocyanate component,ncharacterized in that the flame retardant A4 contains a phosphazene according to the formula (I)n€ ƒ € ƒ € ƒ € ƒ € ƒ € ƒ € ƒ € ƒ [P m N m X k Y 2m-k] € ƒ € ƒ € ƒ € ƒ € (I),nin which,nX, Ynindependently of one another is O-aryl or NR-aryl,nRnis selected from the group of H, C1-C4 alkyl and aryl, andnmnis a number from 1 to 5, particularly preferably 3 or 4,nkndepends on m and stands for a number from 0 to 2m. |