Patent ID: 8445574
Filing Date: 2013-05-21
Classification: C08G,C08K,C08L,Y10T

Abstract:
1. A molded or extruded thermoplastic article, comprising a thermoplastic polyamide composition comprising (a) a polyamide resin having a melting point and/or glass transition temperature; (b) 1 to 10 weight percent of one or more polyhydroxy polymer(s) having a number average molecular weight of at least 2000 and selected from the group consisting of ethylene/vinyl alcohol copolymers; (c) 0.1 to 3 weight percent of one or more co-stabilizer(s) having a 10% weight loss temperature, as determined by thermogravimetric analysis, of greater than 30° C. below said melting point of said polyamide resin if said melting point is present, or at least 250° C. if said melting point is not present, selected from the group consisting of secondary aryl amines, hindered phenols, and mixtures thereof; (d) 10 to about 60 weight percent of one or more reinforcement agents; and (e) 0 to 20 weight percent of a polymeric toughener comprising a reactive functional group and/or a metal salt of a carboxylic acid; wherein all weight percentages are based on the total weight of the polyamide composition; wherein molded 4 mm test bars prepared from said polyamide composition, and exposed at a test temperature at 170° C. for a test period of 500 hours, in an atmosphere of air, and tested according to ISO 527-2/1A, have, on average, a retention of tensile strength of at least 50 percent, as compared with that of an unexposed control of identical composition and shape; and wherein said polyamide resin comprises a one or more polyamides independently selected from the groups consisting of Group (III) Polyamides having said melting point of at least 210° C., and comprising Group (IV) Polyamides comprising Group (V) Polyamides having said melting point of at least 260° C., and comprising Group (VI) polyamides having no melting point, and selected from the group consisting of poly(hexamethylene isophthalamide/hexamethylene terephthalamide) (6I/6T) and poly(hexamethylene isophthalamide/hexamethylene terephthalamide/hexamethylene hexanediamide) (6I/6T/66).