| abstract |
The use of at least one diphosphine of formula (I), n nwhereinn X is S or O; n is 0 or 1; R 1 , R 2 , R 3 , R 4 are independently C 1 -C 10 -alkyl, C 1 -C 10 -hydroxyalkyl, C 1 -C 10 -alkoxy, C 1 -C 10 -hydroxyalkoxy, C 3 -C 10 -cycloalkyl, C 3 -C 10 -cycloalkoxy, C 6 -C 10 -aryl, C 6 -C 10 -aryloxy, C 6 -C 10 -aryl-C 1 -C 4 -alkyl, C 6 -C 10 -aryl-C 1 -C 4 -alkoxy, C 6 -C 10 -hydroxy-aryl, C 6 -C 10 -hydroxy-aryloxy, C 1 -C 10 -thioalkyl, C 6 -C 10 -thioaryl or C 1 -C 4 -thioalkyl-C 6 -C 10 -aryl, NR 5 R 6 , COR 2 , COOR 5 or CONR 5 R 6 ; R 5 , R 6 are H, C 1 -C 10 -alkyl, C 3 -C 10 -cycloalkyl, C 6 -C 10 -aryl or C 6 -C 10 -aryl-C 1 -C 4 -alkyl;n nas a flame retardant in a polyurethane material is provided. |