Phosphorus stabilized-polyester-polycarbonate molding compositions

Claim 1

A composition comprising an admixture of (A) from 99.9 to 98.0 weight percent, based on the weight of the composition, of a polymeric component comprising an admixture of (2) from 5 to 50 weight percent, based on the weight of the polymeric component, bisphenol A polycarbonate having an inherent viscosity of at least 0.3, and (2) from 95 to 50 weight percent, based on the weight of the polymeric component, poly(tetramethylene terephthalate) having an inherent viscosity of at least 0.5, and (B) from 0.1 to 2.0 weight percent, based on the weight of the composition which provides an improvement in the hardness, flexural strength and flexural modulus of said composition, of a phosphorous compound corresponding to the structure ##STR19## where R 1 is a monovalent alkyl radical having 2-18 carbon atoms, or a monovalent aryl or substituted aryl radical having 6-15 carbon atoms, ##STR20## where R 1 is the same as above, ##STR21## where R 1 is the same as above, R 2 is a divalent alkyl radical having 2-12 carbon atoms or a divalent aryl or substituted aryl radical having 6-15 carbon atoms, ##STR22## where R 3 is a divalent alkyl or poly(alkylene oxide) radical having 2-12 carbon atoms or a divalent aryl or substituted aryl radical having 6-15 carbon atoms, or ##STR23## where R 1 is the same as above.