Phosphate esters having the formula RO[-(A).sub.m (B).sub.n ] H wherein A has the structural formula ##SPC1## And B has the structural formula ##SPC2## Wherein the R groups are alkyl radicals, m and n are each integers from 0 to 4 and the sum of m + n is from 1 to about 4, are useful as flame retardants, especially for rigid polyurethane foams.
具有
化学式RO[-(A).sub.m (B).sub.n ] H的
磷酸酯,其中A具有结构式,B具有结构式,在这里R基团是烷基基团,m和n分别是从0到4的整数,m + n的总和约为1到4,对于刚性聚
氨酯泡沫,这些
磷酸酯可用作阻燃剂。