Patent ID: 6063843
Filing Date: 2000-05-16
Classification: C08K

Abstract:
A process for stabilizing polyamide polymers against the damage effected by light, heat and/or oxidation comprising incorporating therein by melt-processing a synergistic additive system resulting in a uniform and intimate mixture with said polyamide, said additive system is selected from the groups consisting of (I) or (II), wherein(I) comprises from 0.01% to 1% by weight of a sterically hindered phenyl phosphonite (Ia), and from 0.05% to 5% by weight of anoxanilide (Ib), or said (Ia) together with from 0.05% to 5% by weight of an aromatic di- or tri-carbonyl compound containing at least one hindered amine moiety adjacent to said carbonyl(s) (Ic); and(II) comprises from 0.05% to 5% by weight of and oxanilide (IIa), and from 0.05% to 5% by weight of said aromatic di- or tri-carbonyl compound containing at least one hindered amine moiety adjacent to said carbonyl(s) (IIb),wherein the percentages represent grams of additives used per hundred grams of polymer.