Flame retardants for plastic foams

Claim 1

A polyurethane foam composition formed by reacting, in an NCO/OH index ranging from 1/1 to 5/4, one or more compounds having reactive-NCO groups with one or more polyol having reactive --OH groups; the polyurethane foam composition containing, by weight, 0.5 to 25 percent, based on the total weight of the foam compositions, of a flame retardant material represented by the formula: ##EQU7## wherein R 1 is a divalent group selected from alkyl, alkoxy, cycloalkyl, cycloalkoxy, aryl an ester represented by the formula ##EQU8## wherein each R 3 is alkyl, alkoxy, cycloalkyl, cycloalkoxy or aryl, each R 3 having 1 to 20 carbon atoms, or an ether represented by the formula R 3 -- O -- R 3 wherein R 3 is as defined above, or a combination thereof, each radical having from 1 to 20 carbon atoms; each R 2 is an alkyl radical having 1 to 20 carbon atoms, each X is chlorine, bromine, fluorine or iodine; one of Y is phosphorus and the other Y is silicon and each m is the integer 2 when Y is phosphorus and the integer 3 when Y is silicon.