PROCESS FOR THE PREPARATION OF HYDROLYSIS-STABLE TRIVALENT PHOSPHORUS COMPOUNDS AND THEIR USE AS STABILIZERS FOR THERMOPLASTICS

摘要

of the disclosure: The hydrolysis stability of trivalent organic phosphorus compounds of the formula I P(OR1)3 (I) of the formula II (II) or of the formula III R3-¢P(OR2)2!n (III) used as stabilizers for thermoplastics is improved if these compounds are treated with 0.01 to 5% by weight of an oxide, a carbonate, a hydroxide, a bicarbonate or a carboxylate of a metal of groups 1a, 2a, 2b and 7b of the periodic table of the elements. The storage stability and the ease of handling are increased and the discoloration of the stabilized polymers is reduced.