| 摘要 |
Disclosed is a process for stabilizing polyamides against the damage effected by light, heat and/or oxidation while improving the differential dyeability, and processing stability therefore, 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 group consisting of (I), (II) and (III) (I) is from 0.01% to 1% by weight of a sterically hindered phenylphosphonite (Ia) with from 0.05% to 5% by weight of oxanilide (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, and preferably two hindered amine moieties (Ic); (II) is from 0.05% to 5% by weight of oxanilide (IIa) together with from 0.05% to 5% by weight of a aromatic di- or tri-carbonyl compound (IIb) containing at least one hindered amine moieties; (III) is from 0.01% to 1% by weight of a sterically hindered phenyl phosphonite (Ia), from 0.05% to 5% by weight of a oxanilide (Ib) and from 0.05% to 5% by weight of an aromatic di- or tri-carbonyl compound; wherein the percentages represent grams of additives used per hundred grams of polymer. Also disclosed are polyamide articles selected from the group consisting of molded articles, extruded articles and fibers, which optionally contain organic dyes, exhibiting outstanding color brightness and color stability.
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