Patent ID: 6414060
Filing Date: 2002-07-02
Classification: C08K

Abstract:
A flame retardant polymer composition which comprises a blend made from a thermoplastic polycarbonate-ABS resin comprised of from about 50 to about 90 weight percent of a polycarbonate resin and from about 10 to about 50 weight percent of an ABS resin and a flame retardant amount of at least one halogen-free phosphoramidate selected from the group consisting of (I) O,O-diaryl-N-arylphosphoramidates, and (II) arylene-N,N-bis(O,O-diaryl-phosphoramidates) in which the nitrogen atoms are in the 1,3 or 1,4 positions on an arylene ring, wherein said flame retardant amount of said at least one halogen-free phosphoramidate is sufficient to provide test specimens of 0.0625 inch thickness containing said at least one halogen-free phosphoramidate that have a V-2 rating in the UL-94 test procedure with the proviso that said amount is in the range of about 5 to about 30 weight percent based on the combined weight of said resin and said phosphoramidate, and wherein said blend is free of the following flame retardant auxiliary additives: antimony-based synergists, halogen-containing flame retardants, and sulfur or sulfur-containing auxiliaries.