OLIGOMERIC PHOSPHORIC ACID ESTERS WHICH CARRY HYDROXYALKOXY GROUPS, THEIR PREPARATION AND THEIR USE

摘要

The invention relates to mixtures of oligomeric phosphoric acid esters which carry hydroxyalkoxy groups, of the formula I <IMG> (I) in which ? denotes an average chain length of 0.5 to 10, R1 is a hydroxyl-containing radical of the formula IIa, R2 is a radical of the formula III <IMG> (IIa: R7 = H) (III) (IIb: R7 = C1-C6) R3 is a radical of the formula IIb, R4 is R1 or R3; R5, R6 and R7 are an H atom or an alkyl radical having 1 to 6 carbon atoms, m is 0 to 4 and n is 1 to 4. The invention also relates to a process for the preparation of the mixtures and to their use as reactive flameproofing agents in polyurethane foams.