Patent ID: 7074851

Claim:
Process for preparing a stabilized composition based on polyamide, comprising a phosphorus stabilizer additive, wherein the phosphorus stabilizer additive is selected from the group consisting of phosphorous acid and hypophosphorous acid and in that it is introduced into the polyamide polymerization medium before or during the polymerization phase, and wherein the composition comprises at least one other stabilizer additive introduced into the polyamide polymerization medium before or during the polymerization phase, said other stabilizer additive selected from the group consisting of a light stabilizer containing at least one hindered amine unit and mixtures thereof with a hindered phenol antioxidant, wherein said light stabilizer is the compound of formula (VI): and the hindered phenol antioxidant is selected from the group consisting of alkylated monophenols: alkylated hydroxyquinones; alkylidene bisphenols, benzyl compounds with alkyl hindrance, acylaminophenols, and esters of Î²-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid.