초록 ▼

Nylon molding compositions, and molded parts formed of the same, include a UV-light stabilization system having between about 0.5 to about 1.0 wt. % of a hindered phenolic antioxidant, between about 0.05 to about 1.5 wt. % of a phosphite compound, between about 0.05 to about 1.5 wt. % of a hindered

Nylon molding compositions, and molded parts formed of the same, include a UV-light stabilization system having between about 0.5 to about 1.0 wt. % of a hindered phenolic antioxidant, between about 0.05 to about 1.5 wt. % of a phosphite compound, between about 0.05 to about 1.5 wt. % of a hindered amine light stabilizer, and optionally, between about 0.05 to about 5.0 wt. % of a benzotriazole UV absorber. The nylon molding compositions and molded parts formed thereof exhibit improved color difference, as calculated in CIELab units under illuminant “D-65”according to ASTM Standard D-2244, of less than about 1.5 when exposed to 601.6 kJ/m2 irradiation in a Xenon arc weatherometer operated according to SAE J1885, and improved surface gloss retention characteristics after such irradiation.

대표청구항 ▼

A nylon molding composition comprising a nylon base resin and a stabilization system which is present in said composition in an amount sufficient to achieve a color difference, as calculated in CIELab units under illuminant “D-65”according to ASTM Standard D-2244, of less than about 1.5 when exposed

A nylon molding composition comprising a nylon base resin and a stabilization system which is present in said composition in an amount sufficient to achieve a color difference, as calculated in CIELab units under illuminant “D-65”according to ASTM Standard D-2244, of less than about 1.5 when exposed to 601.6 kJ/m2 irradiation in a Xenon arc weatherometer operated according to SAE J1885, and exhibiting at least about 75% surface gloss retention after irradiation, and wherein said stabilization system includes: (i) a hindered phenolic antioxidant in the form of tetrakis(methylene(3,5-di-tert-butyl-4-hydroxy-hydrocinnamate)) methane; (ii) a phosphate compound in the form of bis(2,4-di-t-butylphenyl) pentaerythritol diphosphite; (iii) a hindered amine light stabilizer in the form of bis(1,2,2,6,6-pentamethyl-4-piperidinyl)(3,5-di-t-butyl-4-hydroxybenzyl)butyl-propanedioate; and optionally (iv) a benzotriazole UV-light absorber in the form of 2-(3′,5′-bis(1-methyl-1-phenylethyl)-2′-hydroxyphenyl benzotriazole.