| abstract |
The hydrolysis stability of trivalent organic phosphorus compounds of the formula II, or of the formula III, used as stabilizers for thermoplastics is improved if these compounds are treated with, based on the phosphorus compound, 0.005 to 5% by weight of an oxide, a carbonate, a hydroxide or a bicarbonate 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. |