Flame retardant, self-extinguishing polyurethanes and polyurethane foams

A flame retardant, self-extinguishing polyurethane comprising the reaction product of

• (a) a reactive fire retardant mixture comprising about 1-99 weight percent of a halogenated imide-containing polyol having the formula:
• ##STR21## and about 99-1 weight percent of the corresponding ether having the formula:
• ##STR22## wherein R is a hydrocarbon group having the valence n+2 and is selected from the group consisting of benzene groups, naphthalene groups and alicyclic hydrocarbon groups containing 5 to 10 carbon atoms, R' is an aliphatic hydrocarbon group containing 3-12 carbon atoms, X is selected from the group consisting of bromine and chlorine, n is an integer from 1-6 and p is an integer from 2-6 said mixture being about 2-40% of said polyurethane,
• (b) a polyisocyanate in an amount that is 80-150% of the stoichiometric amount required to react with all reactive H atoms on hydroxyl and amine groups and
• (c) optionally, a polyol and/or polyamine.